电力系统功率连接装置接口稳定性问题及其改进措施

摘要

对于功率接口的安全性和可靠性而言,闭环稳定性是首先必须解决的问题.实际应用中,功率接口延时和接口中的直流偏移问题是影响仿真稳定性的2个重要因素.通过采取延时补偿解决延时带来的稳定性问题,针对接口中的直流偏移问题提出了一种直流控制环.现场实验证明,延时补偿方案有效消除了接口误差,直流控制环较好地抑制了功率接口中的直流分量,改进的混合接口方案具有较高的接口稳定性以及良好的动态性能.%For the safety and reliability of power interconnection device in electric power systems, its closed-loop stability is the key issue. The power interface delay and DC offset are two important influencing factors, for which the delay compensation and DC control loop are proposed respectively in a digital -analog hybrid interface scheme. Site experiments show that the proposed scheme has higher stability and better dynamic performance.