摘要
环形双极直流配电网的潮流控制自由度不足,部分线路潮流不可控,且存在极间耦合问题。对此,提出一种基于三有源桥串并联直流潮流控制器(TAB-PFC)的不平衡潮流抑制策略,同时研究了TAB-PFC的解耦控制。首先分析了受端电压、新能源出力不平衡对正负极潮流及线路损耗的影响,推导了恒功率控制下TAB-PFC输出电压和线路电流的表达式,据此建立了含TABPFC的环形双极直流配电网的小信号模型。在此基础上,引入参数解耦矩阵实现正负极控制环路间的近似解耦,提高了控制系统的动态性能。在Matlab/Simulink中建立了含TAB-PFC的环形双极直流配电网的仿真模型,并搭建了实验平台。仿真和实验结果验证了TAB-PFC抑制不平衡潮流及参数解耦矩阵方法的有效性。
The ring bipolar DC distribution network suffers from insufficient power flow control degrees of freedom,which leads to uncontrollable power flow in some transmission lines.Besides,there is a coupling between different poles.In this regard,a triple active bridge power flow controller(TABPFC)based unbalanced power flow suppression strategy is proposed.Meanwhile,the decoupling control of TAB-PFC is studied.Firstly,the influence of unbalanced receiving-end voltage and power of renewable energy on power flow and line losses is studied.Subsequently,the expressions of line current and output voltage of TAB-PFC under constant power control are derived.Moreover,the small-signal model of the ring bipolar DC distribution network with TAB-PFC is established.On this basis,the decoupling matrix is introduced to realize the approximate decoupling between the positive and negative control loops,which improves the dynamic performance of the control system.A simulation model of the ring bipolar DC distribution network with TAB-PFC is established in MATLAB/Simulink,and an experimental platform is built.The effectiveness of TAB-PFC in suppressing unbalanced power and the proposed decoupling are verified through simulation and experimental results.
作者
何大禄
廖建权
王强钢
He Dalu;Liao Jianquan;Wang Qianggang(State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing,400044,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2022年第11期2837-2848,共12页
Transactions of China Electrotechnical Society
基金
国家自然科学基金面上资助项目(52077017)。
关键词
三有源桥(TAB)
直流潮流控制器
环形双极直流配电网
不平衡潮流抑制
解耦控制
Triple active bridge(TAB)
DC power flow controller
ring bipolar DC distribution networks
unbalanced power flow suppression
decoupling control
作者简介
通信作者:何大禄,男,1995年生,硕士研究生,研究方向为直流电网中变换器的建模及其控制。E-mail:hedalu@cqu.edu.cn;廖建权,男,1994年生,博士研究生,研究方向为直流配电网电能质量。E-mail:jquanliao@cqu.edu.cn。
