分布式发电系统并网逆变器输出功率的自适应控制

针对分布式发电系统中三相电压源型PWM并网逆变器控制问题,考虑滤波电感及其寄生电阻在实际中会发生不确定变化的情况以及外部干扰的存在,提出了并网逆变器输出功率的自适应控制方案,通过控制逆变器输出电流实现对输出功率有功和无功分量的解耦控制,实现了并网系统单位功率因数运行,同时保证直流母线电压的平稳。理论分析和仿真结果证明了所采取的控制策略的可行性和有效性。

Output power adaptive control of grid-connected inverter in distributed generation system

In this paper, the control problem of three-phase grid-connected PWM inverter in distributed generation system is in- vestigated. Considering the uncertain changes in the filter inductance and its parasitic resistance, an adaptive power control strategy is proposed. Decoupling control of active and reactive components of the inverter output power is achieved through the regulation of inverter output current, thus the power factor of inverter could achieve one and the dc bus voltage maintain steady at the same time. Both theoretical analysis and simulation results show the feasibility and effectiveness of the adopted control strategy.