构网型VSC暂态稳定机理及改进限幅策略
Transient Stability Mechanism Analysis of the Grid Forming Voltage Source Converter and the Improved Limiting Method
杜毅 1郑超 2孙华东2
作者信息
- 1. 湖南大学电气与信息工程学院,湖南省 长沙市 410082
- 2. 中国电力科学研究院有限公司,北京市 海淀区 100192
- 折叠
摘要
针对构网型变流器(grid-forming voltage source converter,GFM-VSC)系统在大扰动下暂态稳定问题,现有研究未能充分考虑电力电子电源暂态快速响应与控制可塑的特点.为此,以GFM-VSC为对象,借助等面积法原理与相平面图法,从能量角度揭示了其暂态响应机制与传统同步机系统的差异,分析了控制塑造下GFM-VSC系统的暂态稳定机理;然后,针对大扰动下易于触发的限幅环节,分析了系统无法自主退出限幅而失稳的机制,并提出了附带电流分配系数的改进限幅策略,有效增强了系统暂态稳定性.最后,通过仿真验证了理论分析与改进方法的正确性.
Abstract
For the transient stability of the grid-forming voltage source converter(GFM-VSC)system under large disturbances,most existing studies fail to fully consider the fast transient response and control plasticity of power electronic sources.Therefore,this paper takes the GFM-VSC as the object,reveals the difference in transient response mechanism between the GFM-VSC and the SM from an energetic standpoint.With the help of the principle of equal area and phase diagrams methods,the transient stability mechanism of the control-molded GFM-VSC is analyzed.Then,considering the limiter that is easy to trigger under large disturbances,the instability mechanism caused by the failure of the system to exit the current limiting mode is illustrated in detail,and an improved limiting strategy with current distribution coefficient is proposed,which effectively enhances the transient stability of the system.Finally,the correctness of the theoretical analysis and the improved method are verified by simulation.
关键词
构网型技术/电压源型变流器/暂态稳定性/电流限幅环节/控制策略Key words
grid forming(GFM)technology/voltage source converter(VSC)/transient stability/current limitation/control scheme引用本文复制引用
基金项目
中国电力科学研究院有限公司自有资金项目(XT83-22-005)
出版年
2024
国家科技期刊平台
NSTL
万方数据