一种直流动态电压恢复器的拓扑分析与控制

Topology Analysis and Control of a Type of DC Dynamic Voltage Restorer

针对直流配电网中存在的电压暂降和跌落问题,设计了一种新型直流动态电压恢复器(DC-DVR)。拓扑采用隔离型高频DC/AC/DC结构,提高了电压补偿范围和系统的安全性,减小了设备体积。系统控制算法采用基于外推预测电压算法的双环比例积分(PI)控制,根据负载的电压信息,通过外推预测算法对负载的电压进行无差拍预测,提升系统的动态响应速度,电压、电流环的PI控制保证了系统的响应速度和输出的稳态精度,使整个系统具有良好的动态和稳态特性。最后仿真和实验验证了新拓扑的正确性及控制算法的有效性。

Aiming at the problem of voltage sag and sag in DC power distribution network, a new type of DC dynamic voltage restorer（DC-DVR） is designed.By using isolated high frequency DC/AC/DC structure,which reduced the volume of equipment,the range of voltage compensation and the safety of the system are improved.The system control algorithm with double loop proportional integral （PI） control algorithm is based on predictive voltage proportional extrapolation.According to the load voltage information ,by extrapolation prediction algorithm of load voltage without beat forecasts, system dynamic response speed is improved.Voltage loop and current loop of PI control to ensure the steady precision and dynamic response speed,so the system has good dynamic and static characteristics.Simulation and experiment verify the validity of the new topology and the effectiveness of the new DC voltage compensation strategy.