大功率并网逆变器冲击电流的抑制

摘要

To solve the problem of heavy impact current at a time when the high power grid-connected inverter makes a start-up ,a mathematical model of three-phase inverter is established in the reference frame ,for the purpose of analyzing the causes of impact current .The improvement of the control strategy of voltage vector leads to the suppression of the impulse current when the system starts .And the improved current control scheme is applied to a grid-connected inverter with a capability of 500 kVA in the experiment .The result shows that the improved current control scheme is effective and reliable .%针对大功率并网逆变器启动时刻存在冲击电流的问题，在 dq坐标系下建立数学模型，分析了冲击电流产生的原因。通过对电压矢量控制策略的改进，实现了对并网逆变器启动冲击电流的抑制，并在500 kVA并网逆变器上进行实验，其结果验证了该改进控制策略的有效性。