不同故障状态下电网形成变换器的故障穿越控制
Fault Ride-through Control of Grid-forming Converter in Different Fault States
陶军 1钟鸣 1阿敏夫 1孙弘毅 2莫瑞3
作者信息
- 1. 内蒙古电力科学研究院,呼和浩特 010020
- 2. 武汉凯默电气有限公司,武汉 430074
- 3. 广西大学电气工程学院,南宁 530004
- 折叠
摘要
电网形成GFM(grid-forming converter)变换器作为高渗透率电力电子设备电力系统的主要元件之一,其故障穿越FRT(fault-ride through)能力是保证高度电力电子化电力系统稳定运行的重要基础.基于此,提出1种适用于 GFM 变换器的 FRT 策略,既考虑了变换器的硬件约束(即电流约束),又可在发生对称和非对称故障时使GFM在保护模式下运行.首先,详细分析了GFM变换器的FRT相关问题;然后,建立了 1 种适当的FRT模型及控制方法;最后,通过功率硬件在环仿真与实验验证所提方法的有效性.结果表明,与电网跟随变换器相比,所提控制方法可保障 GFM 变换器在故障时瞬时注入无功电流,以防止变换器出现过流问题,并最终实现GFM变换器在严重故障条件下仍可容错运行.
Abstract
The grid-forming(GFM)converter is one of the main components of high-permeability power electronic equipment,and its fault ride-through(FRT)capability is an important basis for ensuring the stable operation of a power system with a high degree of power electronics.On this basis,an FRT strategy for GFM converter is proposed,which not only considers the hardware constraints(i.e.,current constraints)of the converter,but also can keep it running in protected mode under symmetric and asymmetric faults.First,the FRT-related problem of the GFM converter is analyzed in detail.Then,an appropriate FRT model and the corresponding control method are established.Finally,the effectiveness of the proposed method was verified by power-hardware-in-the-loop simulation and experiment.Results show that compared with a grid-following converter,the proposed control method can guarantee the instantaneous injection of reactive current when the GFM converter fails to prevent the overcurrent problem,and the GFM converter can still operate fault-tolerant under serious fault conditions.
关键词
电网形成变换器/电流限制/故障穿越/硬件在环Key words
Grid-forming(GFM)converter/current constraint/fault ride-through(FRT)/hardware-in-the-loop引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据