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风电接入对继电保护的影响(二)——双馈式风电场电磁暂态等值建模研究(2013年第2期)
类别:联席会学术论文专栏 发布时间:[2014-06-12] 点击数:931

张保会1,李光辉1,王  进1,郝治国1,张金华1,黄仁谋2,王小立1,3
(1. 西安交通大学 电气工程学院,陕西 西安 710049;2. 海南电网公司,海南 海口 570100;
3. 宁夏电力公司调度中心,宁夏 银川 750001)

摘要: 提出建立双馈式感应发电机(DFIG)风电场多机等值方案。考虑到DFIG 风机短路故障条件下投入转子 Crowbar 保护后,短路电流与转子实时转速相关的特点,提出以短路故障前瞬间的风机转子转速值作为DFIG风机分群的指标,以准则函数E 收敛后得到的值最小为分群标准,采用K-means 算法将具有相近指标的机组分到同一机群中。针对单个机群中可能存在多种型号DFIG 风机的情况,采用基于容量加权的参数聚合法,计算等值风电机组转子运动方程参数、阻抗参数、变流器及其控制环节参数和箱式变压器参数。在 PSCAD / EMTDC 平台上建立DFIG 风电场详细模型及其等值模型,仿真结果表明在相同故障条件下,风电场等值模型的故障电流能够很好地拟合详细模型。
关键词: DFIG; 风电场; 模型; 电磁暂态等值; 继电保护; 短路电流; 风电

Impact of wind farm integration on relay protection(2):
DFIG-based wind farm electromagnetic transient equivalent model

ZHANG Baohui1,LI Guanghui1,WANG Jin1,HAO Zhiguo1,ZHANG Jinhua1,HUANG Renmou2,WANG Xiaoli1,3
(1. Xi’an Jiaotong University,Xi’an 710049,China;2. Hainan Power Grid Corporation,Haikou 570100,China;3. Dispatch Center of Ningxia Electric Power Company,Yinchuan 750001,China)


Abstract: A multi-machine equivalence scheme is proposed for the electromagnetic transient numerical simulation of large-scale DFIG-based wind farm. Since the short circuit current is related to the real-time rotor speed after the rotor Crowbar protection is put into operation during the short circuit fault of DFIG -based wind generator,it is proposed that,the rotor speed just before the short circuit fault is taken as the classification index of DFIG-based wind generators. With the minimum value of the criterion function E after convergence as the criterion,the K-means clustering algorithm is applied to classify the generators with similar index. As there may be several types of DFIG-based wind generator in a group,the capacity-weighted aggregation is applied to calculate the parameters of the equivalent wind power generators,i.e. the parameters of rotor motion equation,impedance,converter and its controller,and box-type transformer. The detailed model of a DFIG-based wind farm and its equivalent model are established on PSCAD / EMTDC platform and the simulative results show that,under the same fault condition,the fault current of equivalent model fits well that of the detailed model.
Key words: DFIG; wind farms; models; electromagnetic transient equivalence; relay protection; short circuit currents; wind power

点击原文:风电接入对继电保护的影响(二)——双馈式风电场电磁暂态等值建模研究(2013年第2期).pdf

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