一种基于Park模型的并网逆变器VSG控制策略

A Park-based Grid-connected Inverter VSG Control Strategy

提出一种新型并网逆变器VSG控制策略,该策略基于同步发电机的Park数学模型,考虑了电机的凸极效应及阻尼绕组的影响,通过两步Adams法求解同步发电机数学模型,从而得到并网逆变器的参考电流,使并网逆变器具有同步发电机的特性。仿真结果表明,在输入功率、电网电压、电网频率突变等典型工况下,并网逆变器与实际同步发电机具有一致的端口特性。最后搭建了实验平台,验证了所提方案的有效性。

A new realization method of the virtual synchronous generator(VSG)system was presented. The mathematical model of synchronous generator was set up in d-q coordinate system and could be solved by using Adams algorithm to obtain the port current. Refer to this current,the deadbeat control technique was used in the inverter system,making the inverter have the same port characteristics as the actual synchronous generator. The salient pole effect of the synchronous generator and the influence of the damper winding were considered. Simulation results show that the virtual synchronous generator system can simulate as virtual motor port characteristics in many situations such as abrupt change of voltage and frequency mutation.