import numpy as np
[docs]
def reec_d(u,
Vpf,
Paux,
Qext,
Pref):
Vt = u # Input 0
Qext = Qext # Input 8
Paux = Paux # Input 11
Speed = 1.0 # Input 12
Pref = Pref # Input 13
# Reactive Current Injection
Vref0_sig = Vpf
dbd2 = 0.05
Kqv = 2.0
Vdif = Vref0_sig - Vt
Verr = Vdif - abs(dbd2)
Iqinj = Verr * Kqv
# Q-V Limitation
o5 = Qext / Vt
Iqcmd = Iqinj + o5
o6 = Pref
yi10 = Speed * o6
Pord = yi10
o12 = Paux + Pord
o7 = Vt
Ipcmd = o12 / o7
return Iqcmd, Ipcmd
[docs]
def regc_c(Iqcmd, ir, ii, ur, ui, fref, Fnom, Vt, Ipcmd, is_blocked):
iq_ref = - Iqcmd
V_or_one = 1
ip_or_pp = Ipcmd * V_or_one
id_ref = ip_or_pp / V_or_one
return iq_ref, id_ref
[docs]
def genstat(ur, ui, iq_ref, id_ref, Sn):
u1 = ur + 1j * ui
cos_u1 = np.real(u1) / abs(u1)
sin_u1 = np.imag(u1) / abs(u1)
i1 = (id_ref * cos_u1 - iq_ref * sin_u1) + 1j * (id_ref * sin_u1 + iq_ref * cos_u1)
s1 = u1 * np.conj(i1)
Pref = np.real(s1) * Sn # MW
Qref = np.imag(s1) * Sn # MVAr
return Pref, Qref
[docs]
def wecc_wt_type_4b_no_ifs(V_measured, P_measured, Q_measured, S_base_vg, S_rated_vsc, Vpf):
Vt = np.abs(V_measured) # Absolute value of the converter's voltage [pu]
Vt_r = np.real(V_measured) # Real component of the converter's voltage [pu]
Vt_i = np.imag(V_measured) # Imaginary component of the converter's voltage [pu]
S_measured = (-P_measured - 1j * Q_measured) * S_base_vg / S_rated_vsc # Converter's power [pu]
I_measured = np.conj(S_measured / V_measured) # Converter's current [pu]
Ir = np.real(I_measured) # Real component of the converter's current [pu]
Ii = np.imag(I_measured) # Imaginary component of the converter's current [pu]
Iqcmd, Ipcmd, = reec_d(u=Vt,
Vpf=Vpf,
Paux=0.0,
Qext=0.0,
Pref=1.0)
iq_ref, id_ref = regc_c(Iqcmd=Iqcmd, # Current reference from REEC_D [pu]
ir=Ir, # Real component of the converter's current [pu]
ii=Ii, # Imaginary component of the converter's current [pu]
ur=Vt_r, # Real component of the converter's voltage [pu]
ui=Vt_i, # Imaginary component of the converter's voltage [pu]
fref=1.0, # Reference frequency [pu]
Fnom=50.0, # Nominal frequency [Hz]
Vt=Vt, # Absolute value of the converter's voltage [pu]
Ipcmd=Ipcmd, # Current reference from REEC_D [pu]
is_blocked=0.0 # Converter's disconnection = 1
)
Pref, Qref = genstat(ur=Vt_r, # Real component of the converter's voltage [pu]
ui=Vt_i, # Imaginary component of the converter's voltage [pu]
iq_ref=iq_ref, # Current reference from REGC_C [pu]
id_ref=id_ref, # Current reference from REGC_C [pu]
Sn=S_rated_vsc # Converter's nominal power [MVA]
)
# print("\nPref =", Pref, 'MW')
# print("\nQref =", Qref, 'MVAr\n')
return -Pref/S_base_vg, -Qref/S_base_vg