摘要
为了优化不对称故障下永磁直驱风机公共耦合点(PCC)电压支撑策略,首先对电网不对称故障期间的瞬时功率进行分析,得出以消除有功二倍频波动为目标的网侧变流器(GSC)进网电流各序分量表达式。然后分析GSC功率注入对PCC电压的支撑原理,提出了一种基于电网阻抗比的正负序有功、无功电流分配策略,实现有功二倍频波动的消除、PCC正序电压的有效支撑及负序电压的有效抑制。仿真结果验证了所提策略的有效性。
In order to optimize the point of common coupling(PCC)voltage support strategy of permanent magnet direct drive fan under asymmetric faults,the instantaneous power during asymmetrical faults of the power grid is firstly analyzed,and the expressions of each sequence component of the grid-side converter(GSC)incoming current are obtained to eliminate the double frequency fluctuation of active power.Then,the support principle of GSC power injection to PCC voltage is analyzed.At same time,a positive and negative sequence active and reactive current distribution strategy based on the grid impedance ratio is proposed to eliminate the active power double frequency fluctuation,effectively support PCC positive sequence voltage and effectively suppress negative sequence voltage.Simulation results verify the effectiveness of the proposed strategy.
作者
古纯松
陈众
谢辉
GU Chunsong;CHEN Zhong;XIE Hui(Key Laboratory of Intelligent Power Grid Operation and Control,Changsha University of Science and Technology,Changsha 410114,China)
出处
《电器与能效管理技术》
2022年第12期70-77,共8页
Electrical & Energy Management Technology
基金
南网科研院科技项目(0002200000039389)
南网云南电力公司科技项目(KJLC2017006)
关键词
永磁直驱风机
电压支撑
不对称故障
电网阻抗比
permanent magnet direct drive wind turbine
voltage support
asymmetric fault
grid impedance ratio
作者简介
古纯松(1994—),男,硕士研究生,研究方向为新能源并网技术;陈众(1974—),男,副教授,研究方向为电力系统分析;谢辉(1998—),男,硕士研究生,研究方向为高压防雷保护。
