CAJ | 학술논문

风电接入配电网,接入点不同,配电网呈现不同的故障特性,影响传统保护的动作特性. 根据建立的含风电的配电网故障电流关系式,分析了风电接入对配网的影响,提出根据风电场并网位置及对保护的影响确定保护配置方案,风电场接入馈线末端时上游区域配置方向纵联保护,接入馈线首端时下游区域和相邻馈线配置自适应电流速断保护. 通过FFT变换滤除故障分量中的直流分量,采用对称分量故障分量法计算保护背侧阻抗以适应风电场运行工况的多变性,提高自适应电流保护的动作性能. 以PSCAD为平台构建35kV配电系统仿真模型,仿真验证了保护方案的有效性.
풍전접입배전망,접입점불동,배전망정현불동적고장특성,영향전통보호적동작특성. 근거건립적함풍전적배전망고장전류관계식,분석료풍전접입대배망적영향,제출근거풍전장병망위치급대보호적영향학정보호배치방안,풍전장접입궤선말단시상유구역배치방향종련보호,접입궤선수단시하유구역화상린궤선배치자괄응전류속단보호. 통과FFT변환려제고장분량중적직류분량,채용대칭분량고장분량법계산보호배측조항이괄응풍전장운행공황적다변성,제고자괄응전류보호적동작성능. 이PSCAD위평태구건35kV배전계통방진모형,방진험증료보호방안적유효성.
The distribution system show different fault characteristics when wind farm access to the distribution sys-tem, and it will affect the operating characteristics of traditional protection.According to the fault current relationship of established distribution network including wind power, the influence of wind power access to the distribution net-work was analyzed, a protection scheme is proposed according to the wind farm grid connection position and its influ-ence to the protection.It is concluded that when the wind farm access to the end of the feeder, the upstream area should equip with the directional pilot protection, and when the wind farm access to the head of the feeder, the down-stream area and some adjacent feeders should equip with adaptive current outage protection.In order to adapt to the variability running way of wind farm and improve the performance of the adaptive current protection, the direct current component of fault component is filtered by FFT.And then calculate the dorsal impedance with a symmetrical compo-nent fault method.Simulation model of 35kV distribution system is built on the PSCAD platform, which verifies the validity of the scheme proposed.