基于下垂特性的柔性直流配电系统控制策略  

Control Strategy of Flexible DC Distribution System Based on Droop Characteristics

作　　者：李盈含 高亮 LI Yinghan;GAO Liang(School of Electric Power Engineering,Shanghai University of Electric Power,Yangpu District,Shanghai 200082,China)

机构地区：[1]上海电力大学电气工程学院,上海市杨浦区200082

出　　处：《现代电力》2020年第4期391-398,共8页Modern Electric Power

基　　金：国家自然科学基金项目(51777119)。

摘　　要：柔性直流配电系统运行方式多样且源荷功率波动具有高频随机性。为解决传统下垂控制下电能质量较低、功率分配不合理和电压动态调节不理想等问题,提出一种将自适应控制、预测控制与下垂控制相结合的控制策略。首先设计直流电压偏差补偿器实时追踪系统的稳定工作电压,并对传统下垂系数设置动态影响因子,自适应调整下垂系数,按各换流站功率裕度合理分配出力;然后在内环电流控制中引入模型预测控制方法,避免因PI参数整定不当弱化控制效果,进一步提高系统的动态响应能力。在PSCAD上搭建双端柔性直流配电系统仿真模型,对不同运行工况进行仿真,验证了该策略的有效性。The flexible DC power distribution system could operate in various ways and the source-load power fluctuations have high-frequency randomness.In order to solve the problems of low power quality,unreasonable power distribution and unsatisfactory voltage dynamic regulation under traditional droop control,a control strategy combining adaptive control,predictive control and droop control was proposed.Firstly,the DC voltage deviation compensator was designed to track the stable working voltage of the system in real time,and the dynamic influence factor was set for the traditional droop coefficient.The droop coefficient was adaptively adjusted,and the power was reasonably distributed according to the power margin of each converter station.Then the predictive control method was introduced in the inner current control loop to avoid the weakening control effect due to improper PI parameter tuning,and further improve the dynamic response capability of the system.The simulation model of double-ended flexible DC power distribution system was built on PSCAD,and the simulation of different operating conditions verified the effectiveness of the strategy.

关 键 词：柔性直流配电系统 控制策略 下垂控制 自适应调整 预测控制 

分 类 号：TM72[电气工程—电力系统及自动化]