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(二)双馈式风电场电磁暂态等值建模研究
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。(详见2013年第33卷第2期)
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
DOI:
分类号:
基金项目:国家高技术研究发展计划(863计划)资助项目(2012-AA050201)
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.School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;2.Hainan Power Grid Corporation,Haikou 570100,China;3.Dispatching 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

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