基于电压重注式STATCOM的控制策略研究  

Study on Control Strategy Based on Voltage Re⁃injection STATCOM

作　　者：张志艳 陈更 杨朋威 陈肖璐 罗振鹏[2] ZHANG Zhiyan;CHEN Gen;YANG Pengwei;CHEN Xiaolu;LUO Zhenpeng(State Grid East Inner Mongolia Electric Power Company Limited Electric Power Research Institute,Hohhot 010020,China;Electric Power Institute,Inner Mongolia University of Technology,Hohhot 010080,China)

机构地区：[1]国网内蒙古东部电力有限公司电力科学研究院,呼和浩特010020 [2]内蒙古工业大学电力学院,呼和浩特010080

出　　处：《电力电容器与无功补偿》2024年第3期20-27,44,共9页Power Capacitor & Reactive Power Compensation

摘　　要：随着电力电子器件的制造水平不断提升和人们对电能质量要求越来越高,基于电压重注式变换器的静止同步补偿器(STATCOM)动态响应速度快,不需要滤波装置且输出电压谐波含量较低,并且适用于高压大功率的输电系统。直流电压重注式STATCOM的主电路重注拓扑结构由两个三相全桥串联和附加的重注支路构成,重注支路采用级联H桥结构。重注电压产生过零区间能够实现三相全桥开关零电压通断,设计了重注支路脉冲序列构成方法并提出改进循环逻辑触发时序,仿真表明重注支路在特定的循环触发脉冲作用下可以有效抑制重注式级联H桥中电容电压不平衡。利用仿真平台验证了该变换器在过零关断、消除谐波等工作特性方面的优点。把无功电流作为直接的控制命令,建立闭环控制系统,验证该STATCOM在高压大功率系统中能够有效降低谐波含量和开关频率,提高装置和系统的运行可靠性,特别适用于高压大功率环境。With the continuous improvement of the manufacturing level of power electronic elements and the increasing demand of power quality by the people,the static synchronous compensator(STATCOM)based on the voltage re-injection converter has a fast dynamic response speed,does not require filtering devices and outputs low voltage harmonic contents and is suitable for high-voltage and high-power transmission systems.The main circuit re-injection topological structure of the DC voltage re-injection type STATCOM consists of two three-phase full bridges in series and an additional re-injection branch,and the re-injection branch adopts a cascaded H-bridge structure.The zero-crossing interval generated by the re-injection voltage can achieve the zero-voltage on-off of the three-phase full-bridge switch.The construction method of the re-injection branch pulse sequence is designed and an improved cycle logic trigger sequence is proposed.The simulation shows that the re-injection branch can effectively suppress the capacitor voltage unbalance in the re-injection cascaded H-bridge under the specific cyclic trigger pulse.The advantages of the converter in terms of zero-crossing turn-off and harmonic elimination are verified by the simulation platform.The reactive current is taken as a direct control command,a closed-loop control system is set up to verify that the STATCOM can effectively reduce the harmonic content and switching frequency in high-voltage and high-power systems,improve the operation reliability of devices and systems,and is especially suitable for high-voltage and high-power environments.

关 键 词：无功补偿 STATCOM 电压源型变换器 电压重注 高压大容量 

分 类 号：TM761.12[电气工程—电力系统及自动化]