风电场箱式变压器高压侧短路电磁暂态过程研究
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摘要
能够接纳以风力发电为代表的清洁能源发电是智能电网的重要特征。风力发电机组一般通过箱式变压器将风电机组出口较低电压等级变换到较高的电压等级后接入电网。箱式变压器作为风电机组能够并网运行的重要环节,其暂态运行特性对风电机组和电网的安全稳定运行具有重要作用。为了研究风电场箱式变压器高压侧短路时的电磁暂态过程,以单相变压器的等效电路为基础,从电路分析的角度研究了变压器二次侧突然短路时的暂态过程,建立了变压器二次短路时的数学模型,并对模型进行了求解和讨论。基于PSCAD/EMTDC电力系统仿真平台,搭建了风电机组通过箱式变压器接入电网的仿真模型,仿真分析了变压器二次侧短路时短路电流的变化规律,验证了模型的有效性。
Acceptance of clean energy is one of the features in smart grid. Wind power has become an important part of the sustainable development strategy. Wind turbines convert low voltage into high voltage by box-type transformer,electromagnetic transient characteristics of which plays the important role to the safety of wind turbines and integration. It is based on the equivalent circuit of single-phase transformer to analyses the short circuit transient characteristics of its high voltage side. Math method on secondary short circuit current has been set,calculated and discussed. With the help of PSCAD/EMTDC,the model that wind turbines integrate to the grid by boxtype transformer has been simulated. The variation characteristics of transformer secondary short circuit current have been analyzed and this model has been validated by the simulation result.
Acceptance of clean energy is one of the features in smart grid. Wind power has become an important part of the sustainable development strategy. Wind turbines convert low voltage into high voltage by box-type transformer,electromagnetic transient characteristics of which plays the important role to the safety of wind turbines and integration. It is based on the equivalent circuit of single-phase transformer to analyses the short circuit transient characteristics of its high voltage side. Math method on secondary short circuit current has been set,calculated and discussed. With the help of PSCAD/EMTDC,the model that wind turbines integrate to the grid by boxtype transformer has been simulated. The variation characteristics of transformer secondary short circuit current have been analyzed and this model has been validated by the simulation result.
引文
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[2]李常信,常福刚,孙刚,等.东北电网应对大规模新能源接入运行管理机制研究[J].东北电力技术,2014,35(11):5-8.
[3]严干贵,齐磊,李军徽,等.三相电压型整流器反馈线性化解耦系统的PI控制器参数整定[J].南方电网技术,2009,3(5):103-107.
[4]郭金东,赵栋力,林资旭,等.兆瓦级变速恒频风力发电机组控制系统[J].中国电机工程学报,2007,27(6):1-6.
[5]黄寻,侯延鹏.基于PSCAD/EMTDC的双馈型风电机组连锁脱网研究[J].东北电力技术,2016,37(6):31-36.
[6]迟永宁,王伟胜.大型风电场对电力系统暂态稳定性的影响[J].电力系统自动化,2006,30(15):117-121.
[7]曹娜,李岩春,赵海翔,等.不同风电机组对电网暂态稳定性的影响[J].电网技术,2007,31(9):53-57.
[8]徐大平,肖运启,秦涛,等.变桨距型双馈风电机组并网控制及建模仿真[J].电网技术,2008,32(6):100-106.
[9]刘其辉,贺益康,卞松江.变速恒频风力发电机空载并网空载[J].中国电机工程学报,2004,24(3):6-12.