基于构网型逆变器的光伏-储能低电压穿越控制策略OA
Grid-forming Inverter Based Photovoltaic-Energy Storage Low Voltage Ride Through Control Strategy
针对传统虚拟同步发电机(VSG)控制策略在电网电压跌落时存在过电流、功率振荡及动态响应不足等问题,提出一种基于构网型逆变器的改进VSG-低电压穿越(LVRT)模式切换控制策略.该策略通过实时检测电网电压跌落程度,动态切换至两种运行模式:在正常工况及轻度电压跌落时,采用基于阻抗重塑的VSG控制,通过重构虚拟阻抗强化电流环动态响应,提升系统稳定性;在深度电压跌落时,切换至功率快速响应的LVRT控制模式,通过优化有功/无功功率分配、调节惯性系数及补偿动态无功,实现故障期间的无功支撑与功率快速调节.此外,设计了状态跟随器以协调故障恢复阶段的电压幅值与相位同步,抑制模式切换过程中的冲击电流.基于PSCAD/EMTDC的仿真结果验证了该控制策略的正确性和有效性.
To address issues like overcurrent,power oscillations,and insufficient dynamic response in traditional virtual synchronous generator(VSG)control during grid voltage sags,an improved VSG-low voltage ride through(LVRT)mode-switching control strategy for grid-forming inverters was proposed.The strategy dynamically switched between two modes depending on the real-time detected voltage sag depth:under normal operation and mild sags,it employed impedance-reshaping-based VSG control to enhance current loop dynamics and stability by reconstructing virtual impedance;during deep sags,it switched to a power-fast-response LVRT mode,optimizing active/reactive power distribution,adjusting the inertia coefficient,and compensating dynamic reactive power to provide fault-period reactive support and rapid power regulation.A state follower was also designed to coordinate voltage magnitude/phase synchronization during fault recovery,suppressing inrush currents during mode transitions.PSCAD/EMTDC simulations validate the strategy's correctness and effectiveness.
张运泉;陈轩昂;郭晓瑞;文安;叶润
湖州师范学院 湖州市工业系统智能感知与优化控制重点实验室,浙江 湖州 313000浙江安吉通用电力发展有限公司,浙江 安吉 313300湖州师范学院 湖州市工业系统智能感知与优化控制重点实验室,浙江 湖州 313000电子科技大学 长三角研究院(湖州),浙江 湖州 313001电子科技大学 长三角研究院(湖州),浙江 湖州 313001||电子科技大学 自动化工程学院,四川 成都 611731
信息技术与安全科学
构网型逆变器低电压穿越虚拟同步发电机状态跟随
grid-forming inverterlow voltage ride through(LVRT)virtual synchronous generator(VSG)state following
《电气传动》 2026 (4)
31-38,8
浙江省电力有限公司集体企业科技项目(HZTLKJ2023-01)四川省科技计划区域创新项目(2024YFHZ0089)
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