__author__ = 'dmy'
import numpy
def getPowerflowEquation(y,Vm,Va,Pd,Qd,Pg,Qg):
cmpV=Vm*numpy.exp(1j*Va)#复数电压
S=cmpV*(numpy.dot(y.toarray(),cmpV).conj())
P=numpy.real(S)+Pd-Pg
Q=numpy.imag(S)+Qd-Qg
return (P,Q)