基于自适应功率调节的多端柔性直流配电网主从控制策略

Master-slave Control Strategy of Multi-terminal Flexible DC DistributionNetwork Based on Adaptive Power Regulation

针对多端柔性直流配电网(multi-terminal flexible DC distribution network,MFDCDN)传统控制策略存在的电压偏差大、通信依赖性强、参数整定困难等问题,首先分析MFDCDN的典型拓扑和运行方式,然后结合主从控制与下垂控制的优点,提出一种自适应功率调节的MFDCDN主从控制策略。该策略可保障各从属换流站实现电压无差调节和维持功率平衡,从站通过检测母线电压信号能够不依赖通信系统进行模式切换。最后,基于PSCAD/EMTDC平台搭建仿真模型,通过模拟主站退出和负载切除等工况,验证了所提控制策略的有效性和优越性。

Aiming at the problems of the traditional control strategy of the multi-terminal flexible DC distribution network(MFDCDN),such as large voltage deviation,strong communication dependence,difficulty in parameter setting,and so on,this paper firstly analyzes typical topology and the operation mode of MFDCDN and proposes a master-slave control strategy based on adaptive power adjustment combining with the advantages of master-slave control and droop control.This strategy can ensure each slave converter station to achieve voltage difference adjustment and maintain power balance.By detecting the bus voltage signal,the slave station could switch modes without relying on the communication system.Finally,a simulation model is built based on the PSCAD/EMTDC platform,and the effectiveness and superiority of the proposed control strategy are verified by simulating the main station exit and load removal conditions.