摘要
针对采用传统固定系数下垂控制的多端柔性直流输电系统发生大的扰动后直流电压可能超出系统安全运行允许范围的问题,提出一种可以提高系统电压调节能力的自适应电压下垂控制策略。首先,考虑模型精度建立模块化多电平换流器的戴维南等效模型;然后,根据传统下垂控制的功率-电压特性关系,结合采用下垂控制的换流站本地电气量,设计新的自适应电压下垂控制器,与传统下垂控制策略相比,所提出的自适应电压下垂控制器具有更好的直流电压调节能力;最后,在电磁暂态仿真软件(PSCAD/EMTDC)上搭建±200 kV四端柔性直流输电系统仿真模型,验证了所提出自适应电压下垂控制策略的有效性。仿真结果表明:所提出的直流电压自适应下垂控制策略的电压控制效果优于传统下垂控制策略。
To address the issue of possible overvoltage in the DC transmission system beyond the allowable range for safe operation after a significant disturbance occurs,a self-adaptive voltage droop control strategy is proposed to enhance the voltage regulation capability of the system,which adopts conventional fixed coefficient droop control.Firstly,considering model accuracy,the Thevenin equivalent model of the modular multilevel converter is established.Then,based on the power-voltage characteristic relationship of conventional droop control and by incorporating the local electrical quantities of the converter station using droop control,a novel adaptive voltage droop controller is designed.Compared to traditional droop control strategies,the proposed adaptive voltage droop controller exhibits superior DC voltage regulation capability.Finally,a±200 kV four-terminal flexible DC transmission system simulation model is built in the electromagnetic transient simulation software PSCAD/EMTDC to validate the effectiveness of the proposed adaptive voltage droop control strategy.Simulation results demonstrate that the voltage control performance of the proposed adaptive voltage droop control strategy is superior to that of the traditional droop control strategy.
作者
孙季
邱建龙
刘学强
赵浩东
陈向勇
SUN Ji;QIU Jianlong;LIU Xueqiang;ZHAO Haodong;CHEN Xiangyong(School of Automation and Electrical Engineering,Linyi University,Linyi 276005,China;Linyi Power Supply Company,State Grid Shandong Electric Power Company,Linyi 276001,China)
出处
《南通大学学报（自然科学版）》
CAS
2023年第3期45-55,共11页
Journal of Nantong University(Natural Science Edition)
基金
国家自然科学基金面上项目(62173175,61877033)。
