基于特征值分析的DFIG风电机组在微电网中的频率控制策略研究
发布时间：2018-11-04 16:39
【摘要】：随着电力电子技术的发展,变速恒频DFIG风电机组可通过虚拟惯量控制和超速控制减载运行参与电网频率调整。针对含DFIG风电机组的风光柴中压微电网,采用特征值分析方法,分析DFIG风电机组虚拟惯量控制、超速控制和柴油机调速器控制参数变化时微电网的特征值轨迹,找出反映微电网频率响应特性的典型特征值。并通过分析不同虚拟惯量控制和超速控制参数对应的典型特征值变化轨迹,判断微电网频率稳定性的变化,得到虚拟惯量控制和超速控制参数合理选取范围。为改善频率控制参数选取过大产生的频率振荡问题,进一步改进DFIG风电机组有功功率控制系统PI控制参数,从而在改善微电网频率动态响应特性的基础上提高了微电网小干扰稳定性。最后,在DIg SILENT/Power Factory仿真软件中搭建微电网模型,通过动态时域仿真验证所提方法对提高微电网频率稳定性和小干扰稳定性的有效性。
[Abstract]:With the development of power electronic technology, variable speed constant frequency DFIG wind turbine can take part in power network frequency adjustment through virtual inertia control and overspeed control. The characteristic value locus of DFIG wind turbine with variable parameters of virtual inertia control, overspeed control and diesel governor control is analyzed by using eigenvalue analysis method for the wind-firewood medium-voltage microgrid with DFIG wind turbine. The typical eigenvalues reflecting the frequency response of microgrid are found out. By analyzing the variation locus of typical eigenvalues corresponding to different virtual inertia control and overspeed control parameters, the variation of frequency stability of microgrid is judged, and the reasonable selection range of virtual inertia control and overspeed control parameters is obtained. In order to improve the frequency oscillation caused by excessive selection of frequency control parameters, the PI control parameters of active power control system of DFIG wind turbine are further improved. Therefore, the stability of micro-grid with small interference is improved on the basis of improving the frequency dynamic response characteristics of microgrid. Finally, the microgrid model is built in the DIg SILENT/Power Factory simulation software, and the effectiveness of the proposed method in improving the frequency stability and small disturbance stability of the microgrid is verified by dynamic time-domain simulation.
【作者单位】： 上海电力学院电气工程学院;
【基金】：国家自然科学基金项目(51207087) 上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)~~
【分类号】：TM315;TM727
[Abstract]:With the development of power electronic technology, variable speed constant frequency DFIG wind turbine can take part in power network frequency adjustment through virtual inertia control and overspeed control. The characteristic value locus of DFIG wind turbine with variable parameters of virtual inertia control, overspeed control and diesel governor control is analyzed by using eigenvalue analysis method for the wind-firewood medium-voltage microgrid with DFIG wind turbine. The typical eigenvalues reflecting the frequency response of microgrid are found out. By analyzing the variation locus of typical eigenvalues corresponding to different virtual inertia control and overspeed control parameters, the variation of frequency stability of microgrid is judged, and the reasonable selection range of virtual inertia control and overspeed control parameters is obtained. In order to improve the frequency oscillation caused by excessive selection of frequency control parameters, the PI control parameters of active power control system of DFIG wind turbine are further improved. Therefore, the stability of micro-grid with small interference is improved on the basis of improving the frequency dynamic response characteristics of microgrid. Finally, the microgrid model is built in the DIg SILENT/Power Factory simulation software, and the effectiveness of the proposed method in improving the frequency stability and small disturbance stability of the microgrid is verified by dynamic time-domain simulation.
【作者单位】： 上海电力学院电气工程学院;
【基金】：国家自然科学基金项目(51207087) 上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)~~
【分类号】：TM315;TM727
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