Research on PV Grid-Connected Control Methods of Single-Stage Three-Phase Inverter With LCL Filter

doi:10.11985/2016.10.005

Abstract

Abstract:

Reliability and stability of renewable energy grid-connected generation is base of micro-grids coordinating control distributed power generation system (DPGS) completing energy source comprehensive cascade use and making up grid power stable operation. Solar photovoltaic grid connected is applied in an AC micro-grid. Appropriate power control methods are designed. The topology of single-stage photovoltaic grid connected inverter with LCL filters and its references are designed. The scheme of active damping by filter capacitor current is applied to suppress the transient resonance of LCL filter.Control method of power grid voltage feed forward is used in protecting the grid connected current from voltage harmonics of the point of common coupling(PCC)of the power grid. Quasi-proportional-resonant (quasi-PR) method is applied in grid-connected current tracking demanded current. The simulation results show that system operation is fast and stable by grid-connected inverter under PV energy fluctuation and the methods are proved effective and feasible.

Key words: Photovoltaic grid-connection, single-stage inverter with LCL filter, quasi-proportional-resonant, active damping, power grid voltage feed forward

CLC Number:

TM464

Ping Zhang Li,Qi Kun Li,Kun Qi. Research on PV Grid-Connected Control Methods of Single-Stage Three-Phase Inverter With LCL Filter[J]. Journal of Electrical Engineering, 2016, 11(10): 24-30.

Figures/Tables 15

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