储能型静止无功发生装置及其自同步电压源控制  

Energy-storage-type Static Var Generator and Its Autonomous-synchronization Voltage Source Control

作　　者：张家玮 张琛[1,2] 史先强 张宇[1,2] 黄磊 蔡旭[1,2] ZHANG Jiawei;ZHANG Chen;SHI Xianqiang;ZHANG Yu;HUANG Lei;CAI Xu(Department of Electrical Engineering,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Key Laboratory of Control of Power Transmission and Conversion,Shanghai Jiao Tong University,Ministry of Education,Shanghai 200240,China;Sieyuan Electric Co.,Ltd.,Shanghai 201108,China)

机构地区：[1]上海交通大学电子信息与电气工程学院电气工程系,上海200240 [2]上海交通大学电力传输与功率变换控制教育部重点实验室,上海200240 [3]思源电气股份有限公司,上海201108

出　　处：《高电压技术》2023年第1期61-71,共11页High Voltage Engineering

基　　金：思源电气股份有限公司科技项目(大功率电力电子装备若干关键技术研究)(21H010303388)。

摘　　要：针对构建新型电力系统对新能源场站惯量和电压支撑性的迫切需求,提出了一种面向高压大容量场景,且具有自主惯量响应和主动电压支撑能力的储能型静止无功发生装置(energy-storage-typestatic-var-generator,ESVG),以提升新能源场站的友好并网运行能力。通过在风电场常规高压直挂式静止无功补偿装置(staticvar generator, SVG)上集成超级电容储能元件,使SVG具备有功和无功4象限运行的能力;针对该电路拓扑,进一步提出一种基于内电势下垂+环形限流的自同步电压源控制方法,不仅实现了对电网频率和电压的自主、快速支撑,而且可以维持装备在限流控制期间的电压源特性,较全面地逼近了同步机特性。基于提出的控制方法,给出了面向电网频率和电压响应需求的控制参数整定方法。最后,在Matlab/Simulink仿真平台上搭建了ESVG并网系统电磁暂态仿真模型,仿真结果表明:ESVG能够在电网频率或电压波动时主动输出有功功率/无功功率,并能减少因电网有功负荷突然增加引起的频率变化,体现出较好的自主惯量响应和电压支撑能力。The inertia response and voltage support capability of renewable power generations(RPGs) are urgently required in the construction of new-type power system, thus, for high voltage and high rating application scenarios, this paper proposed an energy-storage-type static-var-generator(ESVG) with the capability of autonomous grid support functions, which can help the wind farms achieve grid-friendly integration and operation. By integrating supercapacitors into the existent high voltage SVG of wind farms, the SVG can achieve four-quadrant active and reactive operation. Furthermore, based on the proposed converter circuit, a self-synchronous voltage source control based on the inner-electromotive-force droop with the circular current limitation strategy is proposed. The resulting control method can be adopted to not only achieve autonomous frequency response and grid voltage support, but also retain the voltage source characteristics during the current limitation control period of the device, mimicking a rather complete characteristics of the synchronous generator. In addition, the tuning method for the key control parameters oriented for grid frequency and voltage support demands is provided. Finally, an electromagnetic transient(EMT) simulation model of the grid-tied ESVG system is constructed in Matlab/Simulink. Simulation studies indicate that ESVG can actively output active/reactive power when the grid frequency/voltage fluctuates, reduce the frequency change due to the sudden increase of load in the grid, exhibiting rather satisfactory autonomous inertia response and voltage support capability.

关 键 词：链式电路 SVG 电压源控制 惯量响应 电压支撑 超级电容 

分 类 号：TM761.12[电气工程—电力系统及自动化]