As for the shunt compensation device with different reactance rate in combination with voltage and reactive power control（VQC） of substation

the switching method of capacitor bank under harmonic condition is studied.The number of capacitor switched is determined by the VQC

but the branch to be switched is determined further by the harmonic condition.In this paper

the substation harmonics

according to the severity of harmonics

are divided into four cases and the appropriate configuration methods of capacitor bank at different harmonic cases are studied based on the compensation analysis of harmonic current of capacitor bank after switching.The switching strategy of capacitor bank of various harmonic cases in the voltage and reactive power control of substation

namely

at different harmonic conditions

the capacitor bank at different reactance rate is optimally combined and

under condition of meeting voltage reactive power control

reach the maximum compensation result to the harmonics.Finally

creativeness of the given method is verified through the simulation analysis.