考虑风电场接入电网时,传统方向元件在短路故障发生时易受到风电场内部电力电子器件动态特性的干扰影响,导致频率特性偏移,系统参数不稳定和弱馈性等问题,使继电保护装置不能及时或正确判断故障发生区域。针对上述问题,首先对含有风电场的故障附加网络进行分析,寻找故障发生后纵联保护安装处各测量点电气量之间的关联性,确定其故障逻辑关系。其次通过对常用的相模变换解耦方式进行分析,选择一个合理的方法代入相关性表达式,根据相关系数值完成故障区域判定。最后利用PSCAD/EMTDC搭建双馈风电场并网模型,设置各种不同的故障类型和场景,并利用Matlab进行保护算法验证,检验故障区域判断结果,验证所提保护方法的正确性与合理性,并且仿真结果表明该方法具有较高的可靠性。
Abstract
When the wind farm is connected to the power grid, the traditional directional element is susceptible to the interference of the dynamic characteristics of the power electronic devices inside the wind farm when the short-circuit fault occurs, which leads to the frequency characteristic deviation, system parameter instability and weak feedability, so that the relay protection device cannot judge the fault area timely or correctly. In order to solve the above problems, the fault additional network containing wind farms is analyzed first, and the correlation between the electrical quantities of each measurement point at the pilot protection installation after the fault occurs is found, and the fault logic relationship is determined. Then, through the analysis of the common decoupling mode of phase-mode transformation, a reasonable method is selected to replace the correlation expression, and the fault region is determined according to the correlation coefficient value. Finally, PSCAD/EMTDC is used to build the doubly-fed wind farm grid-connected model and various fault types and scenarios are set. Matlab is used to verify to test the judgment results of the fault area to determine the correctness and rationality of the proposed method. Simulation results show that this method has high reliability.
关键词
风电场 /
双馈风电机组 /
继电保护 /
相关性 /
纵联保护 /
相模变换
Key words
wind farm /
DFIG /
relay protection /
correlation /
pilot protection /
phase-mode transformation
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基金
国家自然科学基金面上项目（51777166）; 国家自然科学基金国际合作与交流项目（52061635105）; 国家电网有限公司总部科技项目 （52094020006U）
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