配电网三相不平衡补偿装置研究  

Research on Three Phase Unbalance Compensation Device of the Distribution Network

作　　者：陈成磊 CHEN Cheng-lei(State Grid Hubei Shiyan Power Supply Company,Shiyan 442099,China)

机构地区：[1]国网湖北省电力有限公司十堰供电公司,湖北十堰442099

出　　处：《电气开关》2024年第6期84-87,共4页Electric Switchgear

摘　　要：大量不平衡负荷接入电网将导致三相电网不平衡,影响电网的经济可靠。提出了一种适用于中低压配电网的负序电流补偿装置。该补偿装置通过反并联晶闸管将电抗器与电容器接入电网,通过调节晶闸管的触发角调节接入电网的阻抗,进而调节补偿装置中补偿电流。在分析了三相不对称电流中正序分量、负序分量与零序分量产生的功率,将负序功率与零序功率通过补偿装置供给负载,因此电网与负荷间交换仅为正序电流产生的功率,最终实现负序电流、零序电流补偿。在分析了负序电流、零序电流的功率,进而分析了补偿装置应该接入电网的阻抗,进而产生补偿装置的触发角,控制接入电网的阻抗。搭建仿真模型验证该方法,结果表明:该补偿装置能够实现负序电流、零序电流补偿。A large number of unbalanced loads connected to the power grid will lead to the unbalanced three-phase power grid,affecting the economic and reliable power grid.This paper presents a negative sequence current compensation device suitable for medium and low voltage distribution network.The compensation device connects the reactor and capacitor to the power grid through the reverse parallel thyristor,adjusts the impedance to the power grid by adjusting the trigger Angle of the thyristor,and then adjusts the compensation current in the compensation device.In this paper,the power generated by positive sequence component,negative sequence component and zero sequence component in the three-phase asymmetric current is analyzed.The negative sequence power and zero sequence power are supplied to the load through the compensation device,so that only the power generated by positive sequence current is exchanged between the grid and the load,and finally the negative sequence current and zero sequence current compensation is realized.In this paper,the power of negative sequence current and zero sequence current is analyzed,and then the impedance of the compensation device should be connected to the power grid is analyzed,and then the trigger angle of the compensation device is generated to control the impedance of the access to the power grid.In this paper,a simulation model is built to verify the method.The results show that the compensation device can realize the negative sequence current compensation and zero sequence current compensation.

关 键 词：补偿装置 三相不平衡 负序电流 控制策略 

分 类 号：TM72[电气工程—电力系统及自动化]