直流故障引发直流外送系统新能源脱网问题研究  

Research on Renewable Energy Off-grid of DC Transmission System Caused by DC Fault

作　　者：曹昊 严欢 王雷 宋云亭 袁性忠 田浩 CAO Hao;YAN Huan;WANG Lei;SONG Yunting;YUAN Xingzhong;TIAN Hao(North China Electric Power Universit(Baoding),Baoding 071003,Hebei Province,China;State Grid Shaanxi Electric Power Economic&Technology Research Institute,Xi’an 710065,Shaanxi Province,China;Northwest Electric Power Design Institute Co.,Ltd.of CPECC,Xi’an 710032,Shaanxi Province,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China;Beijing Huisihuinen Technology Co.,Ltd.,Haidian District,Beijing 100080,China)

机构地区：[1]华北电力大学(保定),河北省保定市071003 [2]国网陕西省电力有限公司经济技术研究院,陕西省西安市710065 [3]中国电力工程顾问集团西北电力设计院有限公司,陕西省西安市710032 [4]中国电力科学研究院有限公司,北京市海淀区100192 [5]北京汇思慧能科技有限公司,北京市海淀区100080

出　　处：《全球能源互联网》2023年第1期71-79,共9页Journal of Global Energy Interconnection

基　　金：国网陕西省电力有限公司科技项目(陕北特高压直流接入后陕西主网运行特性分析研究,HQ-2021-PTS-054)。

摘　　要：含高比例新能源的直流外送系统由于送端发电设备支撑能力薄弱,在直流故障发生后新能源发电设备面临着过电压脱网风险。为了防止新能源脱网事故的发生,首先建立新能源直流外送系统仿真模型分析新能源机端暂态过电压形成机理,其次根据无功传输规律分析常规机组、调相机、电气距离等因素对新能源脱网的影响,定量分析常规机组的电压调节灵敏度,在此基础上利用新能源短路比指标对新能源脱网情况进行量化分析,最后根据分析结果提出了提高短路容量、提高风机高压穿越能力等预防直流故障后新能源脱网的策略,采用某规划的直流外送系统BPA仿真算例验证策略的有效性。Due to the weak support capacity of the power generation equipment at the transmission end of the DC transmission system with a high proportion of renewable energy,the renewable energy power generation equipment faces the risk of over-voltage off grid after the DC fault occurs.In order to prevent the off grid accident of renewable energy,this paper first establishes the simulation model of renewable energy DC transmission system and analyzes the formation mechanism of transient overvoltage at the generator end of renewable energy.Secondly,according to the law of reactive power transmission,this paper analyzes the influence of conventional units,dimmers,electrical distance and other factors on renewable energy off grid,and quantitatively analyzes the voltage regulation sensitivity of conventional units.On this basis,the off grid situation of renewable energy is quantitatively analyzed by using the short-circuit ratio index of renewable energy.Finally,according to the analysis results,this paper puts forward some strategies to prevent renewable energy off grid after DC fault,such as improving the short-circuit capacity and improving the high-voltage crossing capacity of the fan,which are verified by a BPA simulation example of a planned DC transmission system.

关 键 词：直流外送系统 暂态过电压 调相机 常规机组 短路比 抑制策略 

分 类 号：TM715[电气工程—电力系统及自动化]