摘要
新的电力系统运行导则要求风电机组具有低电压穿越能力,电网电压跌落故障的快速准确检测是实现风电系统安全运行及LVRT功能的重要前提条件。详细介绍和讨论了几种常规检测方法和改进的坐标变换检测方法的工作原理及其优缺点,分别进行了仿真比较,并对适用于三相对称电压跌落故障的dq变换法进行了实验研究。仿真及实验结果表明,常规检测算法中峰值电压法、有效值计算法响应速度较慢;改进的坐标变换法响应速度较快,需要优化控制以提高准确度;适用于三相对称跌落故障的dq变换法,响应速度快,准确度高,可以较好地满足风电系统中三相对称电压跌落故障检测的需要。
Low voltage ride through （LVRT） capability is required by new power system operating codes. Fast and accurate detection of grid voltage sag faults is an important condition to achieve safe operation and LVRT of wind power system. The work principles of.several conventional detection methods and several improved coordinate transformation detection methods are explained in detail, and the advantages and disadvantages are discussed, then the simulation comparison is carded out, furthermore the experiment research on dq transformation detection method suitable for 3-phase symmetrical voltage sags is carried out. The simulation and experiment results indicate that, peak voltage and RMS voltage calculation methods of conventional detection method response slowly, and the improved coordinate transformation detection methods response fast but need further optimization to improve accuracy; The dq transformation detection method suitable for 3- phase symmetrical voltage sags has fast response and high accuracy, can satisfy the requirement of 3-phase symmetrical voltage sag faults detection of wind power system.
出处
《大功率变流技术》
2008年第6期17-21,共5页
HIGH POWER CONVERTER TECHNOLOGY
基金
863探索导向项目(2007AA05Z421)
中科院电工研究所所长基金(0710141CS1)
关键词
风电系统
低电压穿越
电网电压跌落
电压跌落检测
坐标变换
wind power system
low voltage fide through （LVRT）
grid voltage sag
voltage sag detection
coordinate transformation
