电网电压不平衡下基于超级电容储能的柔性多状态开关多目标控制策略  

Multi-objective Control Strategy for Flexible Multi-state Switch Based on Supercapacitor Energy Storage Under Grid Voltage Imbalance

作　　者：何东 张文 邹玉新 蔡需同 兰征 HE Dong;ZHANG Wen;ZOU Yuxin;CAI Xutong;LAN Zheng(College of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]湖南工业大学电气与信息工程学院,株洲412007

出　　处：《高电压技术》2024年第12期5482-5494,共13页High Voltage Engineering

基　　金：湖南省教育厅资助科研项目(23B0553);湖南省自然科学基金(2021JJ40172)。

摘　　要：当电网电压不平衡时,传统电压电流控制策略下含柔性多状态开关(flexible multi-state switch,FMSS)的交直流混合配电网交流侧易发生有功和无功功率波动、并网电流畸变以及直流侧直流母线电压波动等电能质量问题。基于此,首先分析了含FMSS的交直流混合配电网拓扑及电压不平衡特性,并提出一种基于超级电容储能的FMSS多目标控制策略。该方法通过调整调节系数D,实现FMSS在输出电流平衡、有功功率和无功功率恒定不同控制目标间的灵活切换。同时利用直流侧超级电容储能系统吸收不平衡功率以稳定直流母线电压,实现电网电压不平衡条件下FMSS的多目标控制。最后利用MATLAB/Simulink仿真软件和硬件在环实验平台搭建含FMSS的交直流混合配电网模型,验证了所提策略的有效性和可行性,确保了交直流互联系统的安全可靠运行。When the grid voltage is unbalanced,power quality problems such as fluctuations in active and reactive power,grid current distortion,and DC bus voltage fluctuation easily occur on the AC side of the AC/DC hybrid distribution net-work with flexible multi-state switch(FMSS)under traditional voltage-current control strategies.Based on this,this paper first analyzes the topology and characteristics of voltage unbalance in the AC-DC hybrid distribution network with FMSS and proposes a multi-objective control strategy for FMSS based on supercapacitor energy storage.The method enables flexible switching of FMSS between different control objectives,such as output current balance and the constancy of ac-tive and reactive power,by adjusting the regulation coefficient D.The method also utilizes the supercapacitor storage on the DC side to control the FMSS.Concurrently,the DC-side supercapacitor energy storage system is used to absorb the unbalanced power and stabilize the DC bus voltage,thereby achieving multi-objective control of FMSS under grid volt-age unbalance conditions.Finally,a hybrid AC-DC distribution network model with FMSS is constructed using MATLAB/Simulink simulation software and a hardware-in-the-loop experimental platform,which verifies the validity and feasibility of the proposed strategy and ensures the safe and reliable operation of the AC-DC interconnection system.

关 键 词：电网电压不平衡 柔性多状态开关 正、负序分量 超级电容储能 多目标控制 

分 类 号：TM53[电气工程—电器]