基于全电力电子OLTC的HUPFC运行特性分析及控制  

Operation characteristics analysis and control of HUPFC based on full-power electronic OLTC

作　　者：刘欣[1] 穆恒玲 LIU Xin;MU Hengling(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《电力工程技术》2023年第4期185-194,共10页Electric Power Engineering Technology

摘　　要：柔性交流输电系统(flexible alternative current transmission systems,FACTS)装置如混合式统一潮流控制器(hybrid unified power flow controller,HUPFC)可调节线路潮流,有效提升输电网络的传输容量。为解决传统HUPFC中使用机械式有载分接开关调压带来的诸多问题,文中提出基于全电力电子有载分接开关的快速电磁式HUPFC。首先,针对其工作特性进行研究,并提出抑制开关切换过程中产生过压的方法。然后,根据不对称级电压Sen变压器的工作点合成方式存在自由度,实现一种开关切换次数最少的抽头选择策略,并给出从潮流指令改变到开关切换调压的详细步骤。最后,在Simulink中搭建220 kV双回线路仿真模型,对比快速电磁式HUPFC与传统HUPFC的潮流调节过程及结果。结果表明,全电力电子开关在响应速度和降低调节过程中的功率波动等方面更具优势,验证了快速电磁式HUPFC的可行性。Flexible alternative current transmission systems(FACTS)devices such as the hybrid unified power flow controller(HUPFC)can adjust the line power flow and effectively increase the transmission capacity of the transmission network.To solve the problems caused by the mechanical on-load tap changer(OLTC)used in the traditional HUPFC,a fast electromagnetic HUPFC based on full-power electronic OLTC is proposed in this paper.Firstly,the operation characteristics of HUPFC are studied,and a method to suppress the overvoltage generated in the switching process is proposed.At the same time,a tap selection strategy with the least switching times is realized by using the asymmetric stage voltage Sen transformer with the existence of degrees of freedom in the synthesis method of operating points,and the detailed steps from power flow instruction change to switching voltage regulation are given.Finally,the 220 kV double-loop circuit simulation model is built in Simulink,and the power flow regulation process and results of the fast electromagnetic HUPFC are compared with those of the traditional HUPFC.The results show that the full-power electronic switch has more advantages in response speed and reducing the power fluctuation in the adjustment process than mechanical OLTC,and the feasibility of the fast electromagnetic HUPFC is verified.

关 键 词：潮流调控 电磁式混合式统一潮流控制器(HUPFC) Sen变压器 全电力电子有载分接开关 开关暂态建模 开关切换策略 

分 类 号：TM571[电气工程—电器]