预测电流法控制三相电压不平衡下VSC-HVDC

Predictive Current Method Control for Novel HVDC under Three Phase Voltage Unbalanced Condition

VSC-HVDC由于连接模式非常灵活和多样,特别是有可能接入低压配电网,其将面临诸如三相不平衡等问题,而三相不平衡问题将影响整个系统的正常运行。双电流闭环控制法虽然可以解决此问题,但是比较复杂。笔者提出利用预测电流法控制VSC-HVDC的理论方法。最终的仿真结果表明,预测电流法能够保证VSC-HVDC在三相电压不平衡情况下仍然保持良好的性能。

Because the connecting modes are very flexible and diversified,VSC-HVDC will face the problems such as three-phase unbalanced condition that will affect the normal operation of the whole system,especially it connects to the low voltage dispatched grids.Dual current closed loop control method can solve the problem,but it too complicated.So the predictive current method was presented in this paper to solve the problem eventually.This method can control the VSC-HVDC system simply and achieve perfect effect at the same time.The final simulation results show excellent performance of the proposed control strategy for the VSC-HVDC under unbalanced condition.