一种LCL型单相并网逆变器控制策略

A LCL-type single-phase grid-connected inverter control strategy

针对传统LCL型并网逆变器存在谐振尖峰和分裂电容单环控制的并网逆变器存在功率因数较低等问题,提出了一种将分裂电容中间电流作为内环、并网电流作为外环的新型双电流环控制策略,给出了Matlab/Simulink仿真结果.仿真结果表明,LCL型单相并网逆变器使用该策略,能实现低谐波、高功率因数并网,验证了该控制策略的可行性.

Aimed at the problems that the traditional LCL-type grid-connected inverters have resonance spikes and grid-connected inverters of split-capacitor single-loop control have a low power factor, this paper pro- poses a novel dual-current loop control strategy in which the split-capacitor intermediate current is used as the in- ner loop and the grid-connected current is used as the outer loop. The simulation results given by Matlab/Simulink show that the LCL-type single-phase grid-connected inverter achieves low-harmonic and high-power factor grid connection by using this strategy, which verifies the feasibility of this control strategy.