def __init__(self, system, config):
TGBase.__init__(self, system, config)
self.F1 = Lag(
u='ue * (omega - wref)',
T=self.T1,
K=self.K1,
)
self.F2 = LeadLag(
u=self.F1_y,
T1=self.T2,
T2=self.T3,
K=1.0,
)
self.HL = GainLimiter(
u='ue * (paux + pref0 - F2_y)',
K=1.0,
R=1.0,
lower=self.PMIN,
upper=self.PMAX,
)
self.F3 = Lag(
u=self.HL_y,
T=self.T4,
K=1.0,
)
self.F4 = Lag(
u=self.F3_y,
T=self.T5,
K=self.K2,
)
self.F5 = Lag(
u=self.F4_y,
T=self.T6,
K=self.K3,
)
self.pout.e_str = 'ue * ((1-K2)*F3_y + (1-K3)*F4_y + F5_y) - pout'
def __init__(self, system, config):
Model.__init__(self, system, config)
self.flags.tds = True
self.group = 'DG'
self.config.add(OrderedDict((('plim', 0),
)))
self.config.add_extra('_help',
plim='enable input power limit check bound by [0, pmx]',
)
self.config.add_extra('_tex',
plim='P_{lim}',
)
self.config.add_extra('_alt',
plim=(0, 1),
)
self.SWPQ = Switcher(u=self.pqflag, options=(0, 1), tex_name='SW_{PQ}', cache=True)
self.buss = DataSelect(self.igreg, self.bus,
info='selected bus (bus or igreg)',
)
self.busfreq = DeviceFinder(self.busf, link=self.buss, idx_name='bus')
# --- initial values from power flow ---
# a : bus voltage angle
# v : bus voltage magnitude
# p0s : active power from connected static PV generator
# q0s : reactive power from connected static PV generator
# pref0 : initial active power set point for the PVD1 device
# qref0 : initial reactive power set point for the PVD1 device
self.a = ExtAlgeb(model='Bus', src='a', indexer=self.buss, tex_name=r'\theta',
info='bus (or igreg) phase angle',
unit='rad.',
e_str='-Ipout_y * v * u',
ename='P',
tex_ename='P',
)
self.v = ExtAlgeb(model='Bus', src='v', indexer=self.buss, tex_name='V',
info='bus (or igreg) terminal voltage',
unit='p.u.',
e_str='-Iqout_y * v * u',
ename='Q',
tex_ename='Q',
)
self.p0s = ExtService(model='StaticGen',
src='p',
indexer=self.gen,
tex_name='P_{0s}',
info='Initial P from static gen',
)
self.q0s = ExtService(model='StaticGen',
src='q',
indexer=self.gen,
tex_name='Q_{0s}',
info='Initial Q from static gen',
)
# --- calculate the initial P and Q for this distributed device ---
self.pref0 = ConstService(v_str='gammap * p0s', tex_name='P_{ref0}',
info='Initial P for the PVD1 device',
)
self.qref0 = ConstService(v_str='gammaq * q0s', tex_name='Q_{ref0}',
info='Initial Q for the PVD1 device',
)
# frequency measurement variable `f`
self.f = ExtAlgeb(model='FreqMeasurement', src='f', indexer=self.busfreq, export=False,
info='Bus frequency', unit='p.u.',
)
self.fHz = Algeb(info='frequency in Hz',
v_str='fn * f', e_str='fn * f - fHz',
unit='Hz',
tex_name='f_{Hz}',
)
# --- frequency branch ---
self.FL1 = Limiter(u=self.fHz, lower=self.ft0, upper=self.ft1,
info='Under frequency comparer', no_warn=True,
)
self.FL2 = Limiter(u=self.fHz, lower=self.ft2, upper=self.ft3,
info='Over frequency comparer', no_warn=True,
)
self.Kft01 = ConstService(v_str='1/(ft1 - ft0)', tex_name='K_{ft01}')
self.Ffl = Algeb(info='Coeff. for under frequency',
v_str='FL1_zi * Kft01 * (fHz - ft0) + FL1_zu',
e_str='FL1_zi * Kft01 * (fHz - ft0) + FL1_zu - Ffl',
tex_name='F_{fl}',
discrete=self.FL1,
)
self.Kft23 = ConstService(v_str='1/(ft3 - ft2)', tex_name='K_{ft23}')
self.Ffh = Algeb(info='Coeff. for over frequency',
v_str='FL2_zl + FL2_zi * (1 + Kft23 * (ft2 - fHz))',
e_str='FL2_zl + FL2_zi * (1 + Kft23 * (ft2 - fHz)) - Ffh',
tex_name='F_{fh}',
discrete=self.FL2,
)
self.Fdev = Algeb(info='Frequency deviation',
v_str='fn - fHz', e_str='fn - fHz - Fdev',
unit='Hz', tex_name='f_{dev}',
)
self.DB = DeadBand1(u=self.Fdev, center=0.0, lower=self.fdbd, upper=0.0, gain=self.ddn,
info='frequency deviation deadband with gain',
) # outputs `Pdrp`
self.DB.db.no_warn = True
# --- Voltage flags ---
self.VL1 = Limiter(u=self.v, lower=self.vt0, upper=self.vt1,
info='Under voltage comparer', no_warn=True,
)
self.VL2 = Limiter(u=self.v, lower=self.vt2, upper=self.vt3,
info='Over voltage comparer', no_warn=True,
)
self.Kvt01 = ConstService(v_str='1/(vt1 - vt0)', tex_name='K_{vt01}')
self.Fvl = Algeb(info='Coeff. for under voltage',
v_str='VL1_zi * Kvt01 * (v - vt0) + VL1_zu',
e_str='VL1_zi * Kvt01 * (v - vt0) + VL1_zu - Fvl',
tex_name='F_{vl}',
discrete=self.VL1,
)
self.Kvt23 = ConstService(v_str='1/(vt3 - vt2)', tex_name='K_{vt23}')
self.Fvh = Algeb(info='Coeff. for over voltage',
v_str='VL2_zl + VL2_zi * (1 + Kvt23 * (vt2 - v))',
e_str='VL2_zl + VL2_zi * (1 + Kvt23 * (vt2 - v)) - Fvh',
tex_name='F_{vh}',
discrete=self.VL2,
)
# --- sensed voltage with lower limit of 0.01 ---
self.VLo = Limiter(u=self.v, lower=0.01, upper=999, no_upper=True,
info='Voltage lower limit (0.01) flag',
)
self.vp = Algeb(tex_name='V_p',
info='Sensed positive voltage',
v_str='v * VLo_zi + 0.01 * VLo_zl',
e_str='v * VLo_zi + 0.01 * VLo_zl - vp',
)
self.Pext0 = ConstService(info='External additional signal added to Pext',
tex_name='P_{ext0}',
v_str='0',
)
self.Pext = Algeb(tex_name='P_{ext}',
info='External power signal (for AGC)',
v_str='u * Pext0',
e_str='u * Pext0 - Pext'
)
self.Pref = Algeb(tex_name='P_{ref}',
info='Reference power signal (for scheduling setpoint)',
v_str='u * pref0',
e_str='u * pref0 - Pref'
)
self.Psum = Algeb(tex_name='P_{tot}',
info='Sum of P signals',
v_str='u * (Pext + Pref + DB_y)',
e_str='u * (Pext + Pref + DB_y) - Psum',
) # `DB_y` is `Pdrp` (f droop)
self.PHL = Limiter(u=self.Psum, lower=0.0, upper=self.pmx,
enable=self.config.plim,
info='limiter for Psum in [0, pmx]',
)
self.Vcomp = VarService(v_str='abs(v*exp(1j*a) + (1j * xc) * (Ipout_y + 1j * Iqout_y))',
info='Voltage before Xc compensation',
tex_name='V_{comp}'
)
self.Vqu = ConstService(v_str='v1 - (qref0 - qmn) / dqdv',
info='Upper voltage bound => qmx',
tex_name='V_{qu}',
)
self.Vql = ConstService(v_str='v0 + (qmx - qref0) / dqdv',
info='Lower voltage bound => qmn',
tex_name='V_{ql}',
)
self.VQ1 = Limiter(u=self.Vcomp, lower=self.Vql, upper=self.v0,
info='Under voltage comparer for Q droop',
no_warn=True,
)
self.VQ2 = Limiter(u=self.Vcomp, lower=self.v1, upper=self.Vqu,
info='Over voltage comparer for Q droop',
no_warn=True,
)
Qdrp = 'u * VQ1_zl * qmx + VQ2_zu * qmn + ' \
'u * VQ1_zi * (qmx + dqdv *(Vqu - Vcomp)) + ' \
'u * VQ2_zi * (dqdv * (v1 - Vcomp)) '
self.Qdrp = Algeb(tex_name='Q_{drp}',
info='External power signal (for AGC)',
v_str=Qdrp,
e_str=f'{Qdrp} - Qdrp',
discrete=(self.VQ1, self.VQ2),
)
self.Qref = Algeb(tex_name=r'Q_{ref}',
info='Reference power signal (for scheduling setpoint)',
v_str='u * qref0',
e_str='u * qref0 - Qref'
)
self.Qsum = Algeb(tex_name=r'Q_{tot}',
info='Sum of Q signals',
v_str=f'u * (qref0 + {Qdrp})',
e_str='u * (Qref + Qdrp) - Qsum',
discrete=(self.VQ1, self.VQ2),
)
self.Ipul = Algeb(info='Ipcmd before Ip hard limit',
v_str='(Psum * PHL_zi + pmx * PHL_zu) / vp',
e_str='(Psum * PHL_zi + pmx * PHL_zu) / vp - Ipul',
tex_name='I_{p,ul}',
)
self.Iqul = Algeb(info='Iqcmd before Iq hard limit',
v_str='Qsum / vp',
e_str='Qsum / vp - Iqul',
tex_name='I_{q,ul}',
)
# --- Ipmax, Iqmax and Iqmin ---
Ipmaxsq = "(Piecewise((0, Le(ialim**2 - Iqcmd_y**2, 0)), ((ialim**2 - Iqcmd_y ** 2), True)))"
Ipmaxsq0 = "(Piecewise((0, Le(ialim**2 - (u*qref0/v)**2, 0)), ((ialim**2 - (u*qref0/v) ** 2), True)))"
self.Ipmaxsq = VarService(v_str=Ipmaxsq, tex_name='I_{pmax}^2')
self.Ipmaxsq0 = ConstService(v_str=Ipmaxsq0, tex_name='I_{pmax0}^2')
self.Ipmax = Algeb(v_str='(SWPQ_s1 * ialim + SWPQ_s0 * sqrt(Ipmaxsq0))',
e_str='(SWPQ_s1 * ialim + SWPQ_s0 * sqrt(Ipmaxsq)) - Ipmax',
tex_name='I_{pmax}',
)
Iqmaxsq = "(Piecewise((0, Le(ialim**2 - Ipcmd_y**2, 0)), ((ialim**2 - Ipcmd_y ** 2), True)))"
Iqmaxsq0 = "(Piecewise((0, Le(ialim**2 - (u*pref0/v)**2, 0)), ((ialim**2 - (u*pref0/v) ** 2), True)))"
self.Iqmaxsq = VarService(v_str=Iqmaxsq, tex_name='I_{qmax}^2')
self.Iqmaxsq0 = ConstService(v_str=Iqmaxsq0, tex_name='I_{qmax0}^2')
self.Iqmax = Algeb(v_str='SWPQ_s0 * ialim + SWPQ_s1 * sqrt(Iqmaxsq0)',
e_str='SWPQ_s0 * ialim + SWPQ_s1 * sqrt(Iqmaxsq) - Iqmax',
tex_name='I_{qmax}',
)
# TODO: set option whether to use degrading gain
# --- `Ipcmd` and `Iqcmd` ---
self.Ipcmd = GainLimiter(u=self.Ipul,
K=1, R='Fvl * Fvh * Ffl * Ffh * recflag + 1 * (1 - recflag)',
lower=0, upper=self.Ipmax,
info='Ip with limiter and coeff.',
tex_name='I^{pcmd}',
)
self.Iqcmd = GainLimiter(u=self.Iqul,
K=1, R='Fvl * Fvh * Ffl * Ffh * recflag + 1 * (1 - recflag)',
lower=self.Iqmax, sign_lower=-1,
upper=self.Iqmax,
info='Iq with limiter and coeff.',
tex_name='I^{qcmd}',
)
self.Ipout = Lag(u=self.Ipcmd_y, T=self.tip, K=1.0,
info='Output Ip filter',
)
self.Iqout = Lag(u=self.Iqcmd_y, T=self.tiq, K=1.0,
info='Output Iq filter',
)
def __init__(self, system, config):
Model.__init__(self, system, config)
self.flags.tds = True
self.group = 'RenExciter'
self.config.add(OrderedDict((('kqs', 2),
('kvs', 2),
('tpfilt', 0.02),
)))
self.config.add_extra('_help',
kqs='Q PI controller tracking gain',
kvs='Voltage PI controller tracking gain',
tpfilt='Time const. for Pref filter',
)
self.config.add_extra('_tex',
kqs='K_{qs}',
kvs='K_{vs}',
tpfilt='T_{pfilt}',
)
# --- Sanitize inputs ---
self.Imaxr = Replace(self.Imax, flt=lambda x: np.less_equal(x, 0), new_val=1e8,
tex_name='I_{maxr}')
# --- Flag switchers ---
self.SWPF = Switcher(u=self.PFFLAG, options=(0, 1), tex_name='SW_{PF}', cache=True)
self.SWV = Switcher(u=self.VFLAG, options=(0, 1), tex_name='SW_{V}', cache=True)
self.SWQ = Switcher(u=self.QFLAG, options=(0, 1), tex_name='SW_{V}', cache=True)
self.SWP = Switcher(u=self.PFLAG, options=(0, 1), tex_name='SW_{P}', cache=True)
self.SWPQ = Switcher(u=self.PQFLAG, options=(0, 1), tex_name='SW_{PQ}', cache=True)
# --- External parameters ---
self.bus = ExtParam(model='RenGen', src='bus', indexer=self.reg, export=False,
info='Retrieved bus idx', vtype=str, default=None,
)
self.buss = DataSelect(self.busr, self.bus, info='selected bus (bus or busr)')
self.gen = ExtParam(model='RenGen', src='gen', indexer=self.reg, export=False,
info='Retrieved StaticGen idx', vtype=str, default=None,
)
self.Sn = ExtParam(model='RenGen', src='Sn', indexer=self.reg,
tex_name='S_n', export=False,
)
# --- External variables ---
self.a = ExtAlgeb(model='Bus',
src='a',
indexer=self.bus,
tex_name=r'\theta',
info='Bus voltage angle',
)
self.v = ExtAlgeb(model='Bus',
src='v',
indexer=self.bus,
tex_name=r'V',
info='Bus voltage magnitude',
) # check whether to use `bus` or `buss`
self.Pe = ExtAlgeb(model='RenGen', src='Pe', indexer=self.reg, export=False,
info='Retrieved Pe of RenGen')
self.Qe = ExtAlgeb(model='RenGen', src='Qe', indexer=self.reg, export=False,
info='Retrieved Qe of RenGen')
self.Ipcmd = ExtAlgeb(model='RenGen', src='Ipcmd', indexer=self.reg, export=False,
info='Retrieved Ipcmd of RenGen',
e_str='-Ipcmd0 + IpHL_y',
)
self.Iqcmd = ExtAlgeb(model='RenGen', src='Iqcmd', indexer=self.reg, export=False,
info='Retrieved Iqcmd of RenGen',
e_str='-Iqcmd0 - IqHL_y',
)
self.p0 = ExtService(model='RenGen',
src='p0',
indexer=self.reg,
tex_name='P_0',
)
self.q0 = ExtService(model='RenGen',
src='q0',
indexer=self.reg,
tex_name='Q_0',
)
# Initial current commands
self.Ipcmd0 = ConstService('p0 / v', info='initial Ipcmd')
self.Iqcmd0 = ConstService('-q0 / v', info='initial Iqcmd')
# --- Initial power factor angle ---
# NOTE: if `p0` = 0, `pfaref0` = pi/2, `tan(pfaref0)` = inf
self.pfaref0 = ConstService(v_str='atan2(q0, p0)', tex_name=r'\Phi_{ref0}',
info='Initial power factor angle',
)
# flag devices with `p0`=0, which causes `tan(PF) = +inf`
self.zp0 = ConstService(v_str='Eq(p0, 0)',
vtype=float,
tex_name='z_{p0}',
)
# --- Discrete components ---
self.Vcmp = Limiter(u=self.v, lower=self.Vdip, upper=self.Vup, tex_name='V_{cmp}',
info='Voltage dip comparator', equal=False,
)
self.Volt_dip = VarService(v_str='1 - Vcmp_zi',
info='Voltage dip flag; 1-dip, 0-normal',
tex_name='z_{Vdip}',
)
# --- Equations begin ---
self.s0 = Lag(u=self.v, T=self.Trv, K=1,
info='Voltage filter',
)
self.VLower = Limiter(u=self.v, lower=0.01, upper=999, no_upper=True,
info='Limiter for lower voltage cap',
)
self.vp = Algeb(tex_name='V_p',
info='Sensed lower-capped voltage',
v_str='v * VLower_zi + 0.01 * VLower_zl',
e_str='v * VLower_zi + 0.01 * VLower_zl - vp',
)
self.pfaref = Algeb(tex_name=r'\Phi_{ref}',
info='power factor angle ref',
unit='rad',
v_str='pfaref0',
e_str='pfaref0 - pfaref',
)
self.S1 = Lag(u='Pe', T=self.Tp, K=1, tex_name='S_1', info='Pe filter',
)
# ignore `Qcpf` if `pfaref` is pi/2 by multiplying (1-zp0)
self.Qcpf = Algeb(tex_name='Q_{cpf}',
info='Q calculated from P and power factor',
v_str='q0',
e_str='(1-zp0) * (S1_y * tan(pfaref) - Qcpf)',
diag_eps=True,
unit='p.u.',
)
self.Qref = Algeb(tex_name='Q_{ref}',
info='external Q ref',
v_str='q0',
e_str='q0 - Qref',
unit='p.u.',
)
self.PFsel = Algeb(v_str='SWPF_s0*Qref + SWPF_s1*Qcpf',
e_str='SWPF_s0*Qref + SWPF_s1*Qcpf - PFsel',
info='Output of PFFLAG selector',
)
self.PFlim = Limiter(u=self.PFsel, lower=self.QMin, upper=self.QMax)
self.Qerr = Algeb(tex_name='Q_{err}',
info='Reactive power error',
v_str='(PFsel*PFlim_zi + QMin*PFlim_zl + QMax*PFlim_zu) - Qe',
e_str='(PFsel*PFlim_zi + QMin*PFlim_zl + QMax*PFlim_zu) - Qe - Qerr',
)
self.PIQ = PITrackAWFreeze(u=self.Qerr,
kp=self.Kqp, ki=self.Kqi, ks=self.config.kqs,
lower=self.VMIN, upper=self.VMAX,
freeze=self.Volt_dip,
)
# If `VFLAG=0`, set the input as `Vref1` (see the NREL report)
self.Vsel = GainLimiter(u='SWV_s0 * Vref1 + SWV_s1 * PIQ_y',
K=1, R=1,
lower=self.VMIN, upper=self.VMAX,
info='Selection output of VFLAG',
)
# --- Placeholders for `Iqmin` and `Iqmax` ---
self.s4 = LagFreeze(u='PFsel / vp', T=self.Tiq, K=1,
freeze=self.Volt_dip,
tex_name='s_4',
info='Filter for calculated voltage with freeze',
)
# --- Upper portion - Iqinj calculation ---
self.Verr = Algeb(info='Voltage error (Vref0)',
v_str='Vref0 - s0_y',
e_str='Vref0 - s0_y - Verr',
tex_name='V_{err}',
)
self.dbV = DeadBand1(u=self.Verr, lower=self.dbd1, upper=self.dbd2,
center=0.0,
enable='DB_{V}',
info='Deadband for voltage error (ref0)'
)
self.pThld = ConstService(v_str='Indicator(Thld > 0)', tex_name='p_{Thld}')
self.nThld = ConstService(v_str='Indicator(Thld < 0)', tex_name='n_{Thld}')
self.Thld_abs = ConstService(v_str='abs(Thld)', tex_name='|Thld|')
self.fThld = ExtendedEvent(self.Volt_dip,
t_ext=self.Thld_abs,
)
# Gain after dbB
Iqv = "(dbV_y * Kqv)"
Iqinj = f'{Iqv} * Volt_dip + ' \
f'(1 - Volt_dip) * fThld * ({Iqv} * nThld + Iqfrz * pThld)'
# state transition, output of Iqinj
self.Iqinj = Algeb(v_str=Iqinj,
e_str=Iqinj + ' - Iqinj',
tex_name='I_{qinj}',
info='Additional Iq signal during under- or over-voltage',
)
# --- Lower portion - active power ---
self.wg = Algeb(tex_name=r'\omega_g',
info='Drive train generator speed',
v_str='1.0',
e_str='1.0 - wg',
)
self.Pref = Algeb(tex_name='P_{ref}',
info='external P ref',
v_str='p0 / wg',
e_str='p0 / wg - Pref',
unit='p.u.',
)
self.pfilt = LagRate(u=self.Pref, T=self.config.tpfilt, K=1,
rate_lower=self.dPmin, rate_upper=self.dPmax,
info='Active power filter with rate limits',
tex_name='P_{filt}',
)
self.Psel = Algeb(tex_name='P_{sel}',
info='Output selection of PFLAG',
v_str='SWP_s1*wg*pfilt_y + SWP_s0*pfilt_y',
e_str='SWP_s1*wg*pfilt_y + SWP_s0*pfilt_y - Psel',
)
# `s5_y` is `Pord`
self.s5 = LagAWFreeze(u=self.Psel, T=self.Tpord, K=1,
lower=self.PMIN, upper=self.PMAX,
freeze=self.Volt_dip,
tex_name='s5',
)
self.Pord = AliasState(self.s5_y)
# --- Current limit logic ---
self.kVq12 = ConstService(v_str='(Iq2 - Iq1) / (Vq2 - Vq1)',
tex_name='k_{Vq12}',
)
self.kVq23 = ConstService(v_str='(Iq3 - Iq2) / (Vq3 - Vq2)',
tex_name='k_{Vq23}',
)
self.kVq34 = ConstService(v_str='(Iq4 - Iq3) / (Vq4 - Vq3)',
tex_name='k_{Vq34}',
)
self.zVDL1 = ConstService(v_str='(Vq1 <= Vq2) & (Vq2 <= Vq3) & (Vq3 <= Vq4) & '
'(Iq1 <= Iq2) & (Iq2 <= Iq3) & (Iq3 <= Iq4)',
tex_name='z_{VDL1}',
info='True if VDL1 is in service',
)
self.VDL1 = Piecewise(u=self.s0_y,
points=('Vq1', 'Vq2', 'Vq3', 'Vq4'),
funs=('Iq1',
f'({self.s0_y.name} - Vq1) * kVq12 + Iq1',
f'({self.s0_y.name} - Vq2) * kVq23 + Iq2',
f'({self.s0_y.name} - Vq3) * kVq34 + Iq3',
'Iq4'),
tex_name='V_{DL1}',
info='Piecewise linear characteristics of Vq-Iq',
)
self.kVp12 = ConstService(v_str='(Ip2 - Ip1) / (Vp2 - Vp1)',
tex_name='k_{Vp12}',
)
self.kVp23 = ConstService(v_str='(Ip3 - Ip2) / (Vp3 - Vp2)',
tex_name='k_{Vp23}',
)
self.kVp34 = ConstService(v_str='(Ip4 - Ip3) / (Vp4 - Vp3)',
tex_name='k_{Vp34}',
)
self.zVDL2 = ConstService(v_str='(Vp1 <= Vp2) & (Vp2 <= Vp3) & (Vp3 <= Vp4) & '
'(Ip1 <= Ip2) & (Ip2 <= Ip3) & (Ip3 <= Ip4)',
tex_name='z_{VDL2}',
info='True if VDL2 is in service',
)
self.VDL2 = Piecewise(u=self.s0_y,
points=('Vp1', 'Vp2', 'Vp3', 'Vp4'),
funs=('Ip1',
f'({self.s0_y.name} - Vp1) * kVp12 + Ip1',
f'({self.s0_y.name} - Vp2) * kVp23 + Ip2',
f'({self.s0_y.name} - Vp3) * kVp34 + Ip3',
'Ip4'),
tex_name='V_{DL2}',
info='Piecewise linear characteristics of Vp-Ip',
)
self.fThld2 = ExtendedEvent(self.Volt_dip,
t_ext=self.Thld2,
extend_only=True,
)
self.VDL1c = VarService(v_str='Lt(VDL1_y, Imaxr)')
self.VDL2c = VarService(v_str='Lt(VDL2_y, Imaxr)')
# `Iqmax` not considering mode or `Thld2`
Iqmax1 = '(zVDL1*(VDL1c*VDL1_y + (1-VDL1c)*Imaxr) + 1e8*(1-zVDL1))'
# `Ipmax` not considering mode or `Thld2`
Ipmax1 = '(zVDL2*(VDL2c*VDL2_y + (1-VDL2c)*Imaxr) + 1e8*(1-zVDL2))'
Ipmax2sq0 = '(Imax**2 - Iqcmd0**2)'
Ipmax2sq = '(Imax**2 - IqHL_y**2)'
# `Ipmax20`-squared (non-negative)
self.Ipmax2sq0 = ConstService(v_str=f'Piecewise((0, Le({Ipmax2sq0}, 0.0)), ({Ipmax2sq0}, True), \
evaluate=False)',
tex_name='I_{pmax20,nn}^2',
)
self.Ipmax2sq = VarService(v_str=f'Piecewise((0, Le({Ipmax2sq}, 0.0)), ({Ipmax2sq}, True), \
evaluate=False)',
tex_name='I_{pmax2}^2',
)
Ipmax = f'((1-fThld2) * (SWPQ_s0*sqrt(Ipmax2sq) + SWPQ_s1*{Ipmax1}))'
Ipmax0 = f'((1-fThld2) * (SWPQ_s0*sqrt(Ipmax2sq0) + SWPQ_s1*{Ipmax1}))'
self.Ipmax = Algeb(v_str=f'{Ipmax0}',
e_str=f'{Ipmax} + (fThld2 * Ipmaxh) - Ipmax',
tex_name='I_{pmax}',
diag_eps=True,
info='Upper limit on Ipcmd',
)
self.Ipmaxh = VarHold(self.Ipmax, hold=self.fThld2)
Iqmax2sq = '(Imax**2 - IpHL_y**2)'
Iqmax2sq0 = '(Imax**2 - Ipcmd0**2)' # initialization equation by using `Ipcmd0`
self.Iqmax2sq0 = ConstService(v_str=f'Piecewise((0, Le({Iqmax2sq0}, 0.0)), ({Iqmax2sq0}, True), \
evaluate=False)',
tex_name='I_{qmax,nn}^2',
)
self.Iqmax2sq = VarService(v_str=f'Piecewise((0, Le({Iqmax2sq}, 0.0)), ({Iqmax2sq}, True), \
evaluate=False)',
tex_name='I_{qmax2}^2')
self.Iqmax = Algeb(v_str=f'(SWPQ_s0*{Iqmax1} + SWPQ_s1*sqrt(Iqmax2sq0))',
e_str=f'(SWPQ_s0*{Iqmax1} + SWPQ_s1*sqrt(Iqmax2sq)) - Iqmax',
tex_name='I_{qmax}',
info='Upper limit on Iqcmd',
)
self.Iqmin = ApplyFunc(self.Iqmax, lambda x: -x, cache=False,
tex_name='I_{qmin}',
info='Lower limit on Iqcmd',
)
self.Ipmin = ConstService(v_str='0.0', tex_name='I_{pmin}',
info='Lower limit on Ipcmd',
)
self.PIV = PITrackAWFreeze(u='Vsel_y - s0_y * SWV_s0',
x0='-SWQ_s1 * Iqcmd0',
kp=self.Kvp, ki=self.Kvi, ks=self.config.kvs,
lower=self.Iqmin, upper=self.Iqmax,
freeze=self.Volt_dip,
)
self.Qsel = Algeb(info='Selection output of QFLAG',
v_str='SWQ_s1 * PIV_y + SWQ_s0 * s4_y',
e_str='SWQ_s1 * PIV_y + SWQ_s0 * s4_y - Qsel',
tex_name='Q_{sel}',
)
# `IpHL_y` is `Ipcmd`
self.IpHL = GainLimiter(u='s5_y / vp',
K=1, R=1,
lower=self.Ipmin, upper=self.Ipmax,
)
# `IqHL_y` is `Iqcmd`
self.IqHL = GainLimiter(u='Qsel + Iqinj',
K=1, R=1,
lower=self.Iqmin, upper=self.Iqmax)
def __init__(self, system, config):
ExcBase.__init__(self, system, config)
self.KPC = ConstService(v_str='KP * exp(1j * radians(THETAP))',
tex_name='K_{PC}',
info='KP polar THETAP',
vtype=np.complex)
# vd, vq, Id, Iq from SynGen
self.vd = ExtAlgeb(
src='vd',
model='SynGen',
indexer=self.syn,
tex_name=r'V_d',
info='d-axis machine voltage',
)
self.vq = ExtAlgeb(
src='vq',
model='SynGen',
indexer=self.syn,
tex_name=r'V_q',
info='q-axis machine voltage',
)
self.Id = ExtAlgeb(
src='Id',
model='SynGen',
indexer=self.syn,
tex_name=r'I_d',
info='d-axis machine current',
)
self.Iq = ExtAlgeb(
src='Iq',
model='SynGen',
indexer=self.syn,
tex_name=r'I_q',
info='q-axis machine current',
)
# control block begin
self.LG = Lag(
self.v,
T=self.TR,
K=1,
info='Voltage transducer',
)
self.UEL = Algeb(info='Interface var for under exc. limiter',
tex_name='U_{EL}',
v_str='0',
e_str='0 - UEL')
self.VE = VarService(
tex_name='V_E',
info='VE',
v_str='Abs(KPC*(vd + 1j*vq) + 1j*(KI + KPC*XL)*(Id + 1j*Iq))',
)
self.IN = Algeb(
tex_name='I_N',
info='Input to FEX',
v_str='KC * XadIfd / VE',
e_str='KC * XadIfd / VE - IN',
)
self.FEX = Piecewise(
u=self.IN,
points=(0, 0.433, 0.75, 1),
funs=('1', '1 - 0.577*IN', 'sqrt(0.75 - IN ** 2)',
'1.732*(1 - IN)', 0),
info='Piecewise function FEX',
)
self.VBMIN = dummify(-9999)
self.VGMIN = dummify(-9999)
self.VB = GainLimiter(
u='VE*FEX_y',
K=1,
upper=self.VBMAX,
lower=self.VBMIN,
no_lower=True,
info='VB with limiter',
)
self.VG = GainLimiter(
u=self.vout,
K=self.KG,
upper=self.VGMAX,
lower=self.VGMIN,
no_lower=True,
info='Feedback gain with HL',
)
self.vrs = Algeb(
tex_name='V_{RS}',
info='VR subtract feedback VG',
v_str='vf0 / VB_y / KM',
e_str='LAW1_y - VG_y - vrs',
)
self.vref = Algeb(
info='Reference voltage input',
tex_name='V_{ref}',
unit='p.u.',
v_str='(vrs + VG_y) / KA + v',
e_str='vref0 - vref',
)
self.vref0 = PostInitService(
info='Initial reference voltage input',
tex_name='V_{ref0}',
v_str='vref',
)
# input excitation voltages; PSS outputs summed at vi
self.vi = Algeb(
info='Total input voltages',
tex_name='V_i',
unit='p.u.',
e_str='-LG_y + vref - vi',
v_str='-v + vref',
)
self.vil = Algeb(info='Input voltage after limit',
tex_name='V_{il}',
v_str='HLI_zi*vi + HLI_zl*VIMIN + HLI_zu*VIMAX',
e_str='HLI_zi*vi + HLI_zl*VIMIN + HLI_zu*VIMAX - vil')
self.HG = HVGate(
u1=self.UEL,
u2=self.vil,
info='HVGate for under excitation',
)
self.LL = LeadLag(
u=self.HG_y,
T1=self.TC,
T2=self.TB,
info='Regulator',
zero_out=True,
) # LL_y == VA
self.LAW1 = LagAntiWindup(
u=self.LL_y,
T=self.TA,
K=self.KA,
lower=self.VRMIN,
upper=self.VRMAX,
info='Lag AW on VR',
) # LAW1_y == VR
self.HLI = HardLimiter(
u=self.vi,
lower=self.VIMIN,
upper=self.VIMAX,
info='Input limiter',
)
self.LAW2 = LagAntiWindup(
u=self.vrs,
T=self.TM,
K=self.KM,
lower=self.VMMIN,
upper=self.VMMAX,
info='Lag AW on VM',
) # LAW2_y == VM
self.vout.e_str = 'VB_y * LAW2_y - vout'
def __init__(self, system, config):
PSSBase.__init__(self, system, config)
# ALL THE FOLLOWING IS FOR INPUT 2
# retrieve indices of bus and bus freq
self.buss2 = DataSelect(self.busr2,
self.bus,
info='selected bus (bus or busr)')
self.busfreq2 = DeviceFinder(self.busf2,
link=self.buss2,
idx_name='bus')
# from Bus
self.v2 = ExtAlgeb(
model='Bus',
src='v',
indexer=self.buss2,
tex_name=r'V',
info='Bus (or busr2, if given) terminal voltage',
)
# from BusFreq 2
self.f2 = ExtAlgeb(model='FreqMeasurement',
src='f',
indexer=self.busfreq2,
export=False,
info='Bus frequency 2')
# Config
self.config.add(OrderedDict([('freq_model', 'BusFreq')]))
self.config.add_extra(
'_help', {'freq_model': 'default freq. measurement model'})
self.config.add_extra('_alt', {'freq_model': ('BusFreq', )})
self.busf.model = self.config.freq_model
self.busf2.model = self.config.freq_model
# input signal switch
self.dv = Derivative(self.v)
self.dv2 = Derivative(self.v2)
self.SnSb = ExtService(
model='SynGen',
src='M',
indexer=self.syn,
attr='pu_coeff',
info='Machine base to sys base factor for power',
tex_name='(Sb/Sn)')
self.SW = Switcher(
u=self.MODE,
options=[0, 1, 2, 3, 4, 5, 6, np.nan],
)
self.SW2 = Switcher(
u=self.MODE2,
options=[0, 1, 2, 3, 4, 5, 6, np.nan],
)
# Input signals
self.sig = Algeb(
tex_name='S_{ig}',
info='Input signal',
)
self.sig.v_str = 'SW_s1*(omega-1) + SW_s2*0 + SW_s3*(tm0/SnSb) + ' \
'SW_s4*(tm-tm0) + SW_s5*v + SW_s6*0'
self.sig.e_str = 'SW_s1*(omega-1) + SW_s2*(f-1) + SW_s3*(te/SnSb) + ' \
'SW_s4*(tm-tm0) + SW_s5*v + SW_s6*dv_v - sig'
self.sig2 = Algeb(
tex_name='S_{ig2}',
info='Input signal 2',
)
self.sig2.v_str = 'SW2_s1*(omega-1) + SW2_s2*0 + SW2_s3*(tm0/SnSb) + ' \
'SW2_s4*(tm-tm0) + SW2_s5*v2 + SW2_s6*0'
self.sig2.e_str = 'SW2_s1*(omega-1) + SW2_s2*(f2-1) + SW2_s3*(te/SnSb) + ' \
'SW2_s4*(tm-tm0) + SW2_s5*v2 + SW2_s6*dv2_v - sig2'
self.L1 = Lag(
u=self.sig,
K=self.K1,
T=self.T1,
info='Transducer 1',
)
self.L2 = Lag(
u=self.sig2,
K=self.K2,
T=self.T2,
info='Transducer 2',
)
self.IN = Algeb(
tex_name='I_N',
info='Sum of inputs',
v_str='L1_y + L2_y',
e_str='L1_y + L2_y - IN',
)
self.WO = WashoutOrLag(
u=self.IN,
K=self.T3,
T=self.T4,
)
self.LL1 = LeadLag(
u=self.WO_y,
T1=self.T5,
T2=self.T6,
zero_out=True,
)
self.LL2 = LeadLag(
u=self.LL1_y,
T1=self.T7,
T2=self.T8,
zero_out=True,
)
self.LL3 = LeadLag(
u=self.LL2_y,
T1=self.T9,
T2=self.T10,
zero_out=True,
)
self.VSS = GainLimiter(u=self.LL3_y,
K=1,
lower=self.LSMIN,
upper=self.LSMAX)
self.VOU = ConstService(v_str='VCUr + v0')
self.VOL = ConstService(v_str='VCLr + v0')
self.OLIM = Limiter(u=self.v,
lower=self.VOL,
upper=self.VOU,
info='output limiter')
self.vsout.e_str = 'OLIM_zi * VSS_y - vsout'
def __init__(self, system, config):
ExcBase.__init__(self, system, config)
self.config.add(OrderedDict((
('ksr', 2),
('ksm', 2),
)))
self.config.add_extra(
'_help',
ksr='Tracking gain for outer PI controller',
ksm='Tracking gain for inner PI controller',
)
self.config.add_extra(
'_tex',
ksr='K_{sr}',
ksm='K_{sm}',
)
self.KPC = ConstService(v_str='KP * exp(1j * radians(THETAP))',
tex_name='K_{PC}',
info='KP polar THETAP',
vtype=complex)
# vd, vq, Id, Iq from SynGen
self.vd = ExtAlgeb(
src='vd',
model='SynGen',
indexer=self.syn,
tex_name=r'V_d',
info='d-axis machine voltage',
)
self.vq = ExtAlgeb(
src='vq',
model='SynGen',
indexer=self.syn,
tex_name=r'V_q',
info='q-axis machine voltage',
)
self.Id = ExtAlgeb(
src='Id',
model='SynGen',
indexer=self.syn,
tex_name=r'I_d',
info='d-axis machine current',
)
self.Iq = ExtAlgeb(
src='Iq',
model='SynGen',
indexer=self.syn,
tex_name=r'I_q',
info='q-axis machine current',
)
# control block begin
self.LG = Lag(
self.v,
T=self.TR,
K=1,
info='Voltage transducer',
)
self.UEL = Algeb(info='Interface var for under exc. limiter',
tex_name='U_{EL}',
v_str='0',
e_str='0 - UEL')
# lower part: VB signal
self.VE = VarService(
tex_name='V_E',
info='VE',
v_str='Abs(KPC*(vd + 1j*vq) + 1j*(KI + KPC*XL)*(Id + 1j*Iq))',
)
self.IN = Algeb(
tex_name='I_N',
info='Input to FEX',
v_str='safe_div(KC * XadIfd, VE)',
e_str='ue * (KC * XadIfd - VE * IN)',
diag_eps=True,
)
self.FEX = Piecewise(
u=self.IN,
points=(0, 0.433, 0.75, 1),
funs=('1', '1 - 0.577*IN', 'sqrt(0.75 - IN ** 2)',
'1.732*(1 - IN)', 0),
info='Piecewise function FEX',
)
self.VBMIN = dummify(-9999)
self.VGMIN = dummify(-9999)
self.VB = GainLimiter(
u='VE*FEX_y',
K=1,
R=1,
upper=self.VBMAX,
lower=self.VBMIN,
no_lower=True,
info='VB with limiter',
)
self.VG = GainLimiter(
u=self.vout,
K=self.KG,
R=1,
upper=self.VGMAX,
lower=self.VGMIN,
no_lower=True,
info='Feedback gain with HL',
)
self.vref = Algeb(info='Reference voltage input',
tex_name='V_{ref}',
unit='p.u.',
v_str='v',
e_str='vref0 - vref')
self.vref0 = PostInitService(
info='Const reference voltage',
tex_name='V_{ref0}',
v_str='vref',
)
self.vi = Algeb(
info='Total input voltages',
tex_name='V_i',
unit='p.u.',
e_str='-LG_y + vref - vi',
v_str='-v + vref',
)
self.PI1 = PITrackAW(u=self.vi,
kp=self.KPR,
ki=self.KIR,
ks=self.config.ksr,
lower=self.VRMIN,
upper=self.VRMAX,
x0='VG_y')
self.LA = Lag(
u=self.PI1_y,
T=self.TA,
K=1.0,
info='Regulation delay',
)
self.PI2 = PITrackAW(
u='LA_y - VG_y',
kp=self.KPM,
ki=self.KIM,
ks=self.config.ksm,
lower=self.VMMIN,
upper=self.VMMAX,
x0='safe_div(vf0, VB_y)',
)
# TODO: add back LV Gate
self.vout.e_str = 'VB_y * PI2_y - vout'
def __init__(self, system, config):
Model.__init__(self, system, config)
self.flags.tds = True
self.group = 'RenGen'
self.a = ExtAlgeb(model='Bus',
src='a',
indexer=self.bus,
tex_name=r'\theta',
info='Bus voltage angle',
e_str='-Pe',
)
self.v = ExtAlgeb(model='Bus',
src='v',
indexer=self.bus,
tex_name=r'V',
info='Bus voltage magnitude',
e_str='-Qe',
)
self.p0s = ExtService(model='StaticGen',
src='p',
indexer=self.gen,
tex_name='P_{0s}',
info='initial P of the static gen',
)
self.q0s = ExtService(model='StaticGen',
src='q',
indexer=self.gen,
tex_name='Q_{0s}',
info='initial Q of the static gen',
)
self.p0 = ConstService(v_str='p0s * gammap',
tex_name='P_0',
info='initial P of this gen',
)
self.q0 = ConstService(v_str='q0s * gammaq',
tex_name='Q_0',
info='initial Q of this gen',
)
self.ra = ExtParam(model='StaticGen',
src='ra',
indexer=self.gen,
tex_name='r_a',
export=False,
)
self.xs = ExtParam(model='StaticGen',
src='xs',
indexer=self.gen,
tex_name='x_s',
export=False,
)
# --- INITIALIZATION ---
self.q0gt0 = ConstService('Indicator(q0> 0)', tex_name='z_{q0>0}',
info='flags for q0 below zero',
)
self.q0lt0 = ConstService('Indicator(q0< 0)', tex_name='z_{q0<0}',
info='flags for q0 below zero',
)
self.Ipcmd0 = ConstService('p0 / v', info='initial Ipcmd',
tex_name='I_{pcmd0}',
)
self.Iqcmd0 = ConstService('-q0 / v', info='initial Iqcmd',
tex_name='I_{qcmd0}',
)
self.Ipcmd = Algeb(tex_name='I_{pcmd}',
info='current component for active power',
e_str='Ipcmd0 - Ipcmd', v_str='Ipcmd0')
self.Iqcmd = Algeb(tex_name='I_{qcmd}',
info='current component for reactive power',
e_str='Iqcmd0 - Iqcmd', v_str='Iqcmd0')
# reactive power management
# rate limiting logic (for fault recovery, although it does not detect any recovery)
# - activate upper limit when q0 > 0 (self.q0gt0)
# - activate lower limit when q0 < 0 (self.q0lt0)
self.S1 = LagAntiWindupRate(u=self.Iqcmd,
T=self.Tg, K=-1,
lower=-9999, upper=9999, no_lower=True, no_upper=True,
rate_lower=self.Iqrmin, rate_upper=self.Iqrmax,
rate_lower_cond=self.q0lt0, rate_upper_cond=self.q0gt0,
tex_name='S_1',
info='Iqcmd delay',
) # output `S1_y` == `Iq`
# piece-wise gain for low voltage active current mgnt.
self.kLVG = ConstService(v_str='1 / (Lvpnt1 - Lvpnt0)',
tex_name='k_{LVG}',
)
self.LVG = Piecewise(u=self.v, points=('Lvpnt0', 'Lvpnt1'),
funs=('0', '(v - Lvpnt0) * kLVG', '1'),
info='Ip gain during low voltage',
tex_name='L_{VG}',
)
# piece-wise gain for LVPL
self.kLVPL = ConstService(v_str='Lvplsw * Lvpl1 / (Brkpt - Zerox)',
tex_name='k_{LVPL}',
)
self.S2 = Lag(u=self.v, T=self.Tfltr, K=1.0,
info='Voltage filter with no anti-windup',
tex_name='S_2',
)
self.LVPL = Piecewise(u=self.S2_y,
points=('Zerox', 'Brkpt'),
funs=('0 + 9999*(1-Lvplsw)',
'(S2_y - Zerox) * kLVPL + 9999 * (1-Lvplsw)',
'9999'),
info='Low voltage Ipcmd upper limit',
tex_name='L_{VPL}',
)
self.S0 = LagAntiWindupRate(u=self.Ipcmd, T=self.Tg, K=1,
upper=self.LVPL_y, rate_upper=self.Rrpwr,
lower=-9999, rate_lower=-9999,
no_lower=True, rate_no_lower=True,
tex_name='S_0',
) # `S0_y` is the output `Ip` in the block diagram
self.Ipout = Algeb(e_str='S0_y * LVG_y -Ipout',
v_str='Ipcmd * LVG_y',
info='Output Ip current',
tex_name='I_{pout}',
)
# high voltage part
self.HVG = GainLimiter(u='v - Volim', K=self.Khv, info='High voltage gain block',
lower=0, upper=999, no_upper=True,
tex_name='H_{VG}'
)
self.HVG.lim.no_warn = True
self.Iqout = GainLimiter(u='S1_y- HVG_y', K=1, lower=self.Iolim, upper=9999,
no_upper=True, info='Iq output block',
tex_name='I^{qout}',
) # `Iqout_y` is the final Iq output
self.Pe = Algeb(tex_name='P_e', info='Active power output',
v_str='p0', e_str='Ipout * v - Pe')
self.Qe = Algeb(tex_name='Q_e', info='Reactive power output',
v_str='q0', e_str='Iqout_y * v - Qe')
def __init__(self, system, config):
ExcBase.__init__(self, system, config)
self.flags.nr_iter = True
ExcVsum.__init__(self)
self.UEL0.v_str = '-999'
self.OEL0.v_str = '999'
self.ulim = ConstService('9999')
self.llim = ConstService('-9999')
self.SWUEL = Switcher(u=self.UELc,
options=[0, 1, 2, 3],
tex_name='SW_{UEL}',
cache=True)
self.SWVOS = Switcher(u=self.VOSc,
options=[0, 1, 2],
tex_name='SW_{VOS}',
cache=True)
# control block begin
self.LG = Lag(
self.v,
T=self.TR,
K=1,
info='Voltage transducer',
)
self.SG0 = ConstService(v_str='0', info='SG initial value.')
self.SG = Algeb(
tex_name='SG',
info='SG',
v_str='SG0',
e_str='SG0 - SG',
)
self.zero = ConstService('0')
self.LR = GainLimiter(
u='XadIfd - ILR',
K=self.KLR,
R=1,
upper=self.ulim,
lower=self.zero,
no_upper=True,
info='Exciter output current gain limiter',
)
self.VA0 = PostInitService(tex_name='V_{A0}',
v_str='vf0 - SWVOS_s2 * SG + LR_y',
info='VA (LA_y) initial value')
self.vref.v_str = 'ue * (v + (vf0 - SWVOS_s2 * SG + LR_y) / KA - SWVOS_s1 * SG - SWUEL_s1 * UEL)'
self.vref.v_iter = 'ue * (v + (vf0 - SWVOS_s2 * SG + LR_y) / KA - SWVOS_s1 * SG - SWUEL_s1 * UEL)'
self.vref0 = PostInitService(
info='Initial reference voltage input',
tex_name='V_{ref0}',
v_str='vref',
)
self.vi = Algeb(
info='Total input voltages',
tex_name='V_i',
unit='p.u.',
e_str=
'ue * (-LG_y + vref - WF_y + SWUEL_s1 * UEL + SWVOS_s1 * SG + Vs) - vi',
v_iter=
'ue * (-LG_y + vref - WF_y + SWUEL_s1 * UEL + SWVOS_s1 * SG + Vs)',
v_str=
'ue * (-LG_y + vref - WF_y + SWUEL_s1 * UEL + SWVOS_s1 * SG + Vs)',
)
self.vil = GainLimiter(
u=self.vi,
K=1,
R=1,
upper=self.VIMAX,
lower=self.VIMIN,
info='Exciter voltage input limiter',
)
self.UEL2 = Algeb(
tex_name='UEL_2',
info='UEL_2 as HVG1 u1',
v_str='ue * (SWUEL_s2 * UEL + (1 - SWUEL_s2) * llim)',
e_str='ue * (SWUEL_s2 * UEL + (1 - SWUEL_s2) * llim) - UEL2',
)
self.HVG1 = HVGate(
u1=self.UEL2,
u2=self.vil_y,
info='HVGate after V_I',
)
self.LL = LeadLag(
u=self.HVG1_y,
T1=self.TC,
T2=self.TB,
info='Lead-lag compensator',
zero_out=True,
)
self.LL1 = LeadLag(
u=self.LL_y,
T1=self.TC1,
T2=self.TB1,
info='Lead-lag compensator 1',
zero_out=True,
)
self.LA = LagAntiWindup(
u=self.LL1_y,
T=self.TA,
K=self.KA,
upper=self.VAMAX,
lower=self.VAMIN,
info='V_A, Anti-windup lag',
) # LA_y is VA
self.vas = Algeb(
tex_name=r'V_{As}',
info='V_A after subtraction, as HVG u2',
v_str='ue * (SWVOS_s2 * SG + LA_y - LR_y)',
v_iter='ue * (SWVOS_s2 * SG + LA_y - LR_y)',
e_str='ue * (SWVOS_s2 * SG + LA_y - LR_y) - vas',
)
self.UEL3 = Algeb(
tex_name='UEL_3',
info='UEL_3 as HVG u1',
v_str='ue * (SWUEL_s3 * UEL + (1 - SWUEL_s3) * llim)',
e_str='ue * (SWUEL_s3 * UEL + (1 - SWUEL_s3) * llim) - UEL3',
)
self.HVG = HVGate(
u1=self.UEL3,
u2=self.vas,
info='HVGate for under excitation',
)
self.LVG = LVGate(
u1=self.HVG_y,
u2=self.OEL,
info='HVGate for over excitation',
)
# vd, vq, Id, Iq from SynGen
self.vd = ExtAlgeb(
src='vd',
model='SynGen',
indexer=self.syn,
tex_name=r'V_d',
info='d-axis machine voltage',
)
self.vq = ExtAlgeb(
src='vq',
model='SynGen',
indexer=self.syn,
tex_name=r'V_q',
info='q-axis machine voltage',
)
self.efdu = VarService(
info='Output exciter voltage upper bound',
tex_name=r'efd_{u}',
v_str='Abs(vd + 1j*vq) * VRMAX - KC * XadIfd',
)
self.efdl = VarService(info='Output exciter voltage lower bound',
tex_name=r'efd_{l}',
v_str='Abs(vd + 1j*vq) * VRMIN')
self.vol = GainLimiter(
u=self.LVG_y,
K=1,
R=1,
upper=self.efdu,
lower=self.efdl,
info='Exciter output limiter',
)
self.WF = Washout(
u=self.LVG_y,
T=self.TF,
K=self.KF,
info='V_F, Stablizing circuit feedback',
)
self.vout.e_str = 'ue * vol_y - vout'
