电力系统保护与控制2024，Vol.52Issue(23)：54-64,11.DOI:10.19783/j.cnki.pspc.240544
基于构网储能型SVG的自适应限流策略
Adaptive current limiting strategy based on grid-forming and energy-storage SVG
摘要
Abstract
Grid-forming static var generators(SVGs)possess voltage-source characteristics that can enhance the stability and proactive voltage support capabilities of weak grids.The SVG with partial energy storage can provide inertia support.To address the problem that an energy-storage static var generator(ESVG)is prone to overcurrent when employing grid-forming control,this paper analyzes the joint control mechanism between the cascaded H-bridge and the energy storage system,based on the ESVG topology.Building on the current limiting mechanism and existing limiting strategies of the grid-forming ESVG,an adaptive virtual admittance current limiting strategy suitable for symmetrical faults is proposed.The strategy not only maintains the voltage-source characteristics of the ESVG but also significantly reduces transient overcurrent and overvoltage.Additionally,the strategy incorporates the clearing of transient virtual impedance to ensure its reliability.The effect of the virtual impedance ratio on stability is analyzed by a current closed-loop controller.Finally,the correctness of the theoretical analysis and the effectiveness of the proposed current limiting strategy are verified by simulation.关键词
构网型控制/ESVG/自适应限流/电压源模式/虚拟导纳Key words
grid-forming control/ESVG/adaptive current limiting/voltage-source mode/virtual admittance引用本文复制引用
王凤,许建中..基于构网储能型SVG的自适应限流策略[J].电力系统保护与控制,2024,52(23):54-64,11.基金项目
This work is supported by the General Program of National Natural Science Foundation of China(No.52277094). 国家自然科学基金面上项目资助(52277094) （No.52277094）
国家电网公司科技项目资助(5500-202158475A-0-5-ZN) （5500-202158475A-0-5-ZN）
