Grid inverter type for LCL resonance problem

an effective way to solve it is to use thecapacitor current feedback active damping method

quasi PR（resonance） regulator compared withdouble PI control

fast response

good robustness

and is suitable for control of the grid current. In orderto further reduce the LCL type grid current harmonic content

this paper puts forward a kind of based ongrid voltage differential feedforward and combination of the resonance control combined with the harmonicsuppression strategies. For the grid current harmonic suppression

proper equivalent conversion is carriedout. Then

to sine signal change tracking of no difference

and the grid voltage to current inner loop ofeliminating interference

hence select multiple resonance PR controller as its controller. Finally

theharmonic suppression strategy is simulated by Matlab/Simulink

the rationality and validity of theproposed method are verified

at the same time

the dynamic performance and steady state performanceas well as anti-interference capability of the system are greatly improved

and the harmonic content of thegrid current is effectively reduced. And the strategy of three-phase capacitance detection can be omitted

cost saving.