无隔离三相逆变器并联运行的直流环流控制

Control of DC Circulating-current for 3-phase Inverter Systems in Parallel Running without Isolation Transformer

针对无隔离变压器的三相逆变器并联运行系统,分析其直流环流产生的原因及数学模型,并根据系统模型提出了其直流环流的抑制方案。仿真验证了该方案的有效性。此方法简单易行,效果显著。

Aiming to 3-phase inverter in parallel running without isolation transformer,the producing theorem of DC circulating-current and the mathematical models are analyzed.A new control strategy of the DC circulating-current is proposed based on the system model.The validity of proposed scheme is proved by simulation results.It shows that this scheme is simple and effective.