The Advanced SVG has been used widely due to its function of compensating reactive power and improving waveform simultaneously.Since the core part of the enhanced SVG is the switching circuit

therefore its output exists switching sub-harmonics.For suppressing such harmonics

theoutlet of enhanced SVG is usually connected with the LCL filter.When a single SVG is connected to the network

the function of reactive power compensation and waveform improvement can be better realized by setting relevant parameters in advance.In a real system

however

there are usually two or more SVG’s running in parallel.In this case

due to the electrical characteristics of the LCL filters and the power grid itself

resonance may occur in the system

which has an adverse impact on the stability of the system and

at this time

it’ s difficult to deal with the resonance effectively by parameter setting.In this paper

the resonance mechanism of enhanced SVG’s running in parallel is proposed and a kind of resonance suppression coordination control scheme is proposed through equivalent circuit study and simulation.