改进电流型三相并网逆变器控制建模和仿真

摘要

In order to settle the difficulty of monitoring the power components in traditional control method applied in the three - phase grid - connected inverter systems, a new control strategy based on the combination of the Sin wave Pulse Width Modulation (SPWM) and the current controlled method is proposed.By applying the PARK transformation to the output parameters of the three phase inverter and adopting the PI control method together with the feed -forward control in the established control loop, the control strategy based on the active component and reactive component of the current is realized to get an ameliorated pedormance.A simulation model of the described system is established in the Simulink environment.The simulation results show that the improved strategy can effectively control the grid -connected active and reactive power, with an insignificant total harmonic distortion, thus has a stronger application value.%研究改善传统三相并网逆变系统并网功率不易控制的问题,针对电网稳定控制供电,为了提高并网动特性,提出了一种基于正弦波脉宽调制与电流控制相结合的新型控制方案.对三相逆变器的输出参数应用PARK变换,并采取双电流环PI加前馈控制策略,实现了对电流的有功分量与无功分量对并网逆变器系统输出性能的控制.在Simulink环境下建立了系统的仿真模型,仿真结果表明,改进型的电流控制方法可以有效控制并网系统的有功与无功功率,谐波畸变小,是一种有较强应用价值的三相逆变器控制方案,为设计提供了科学依据.