特高压直流逆变站功率特性与建模
Analysis and Model of Output Power Characteristics in UHVDC Inverter Stations
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摘要: 特高压直流(ultra-high voltage direct current,UHVDC)输电有助于我国实现能源资源的优化配置,因而发展十分迅速。UHVDC送电容量大,当其发生闭锁后,会对电网造成严重的影响。因此,建立合适的功率模型,进而准确地分析UHVDC闭锁对受端电网的影响十分必要。该文首先分析了UHVDC闭锁后极间功率转移机理,以及建立了UHVDC逆变站的有功模型;其次分析了逆变站无功的消耗机理,并结合无功补偿设备投切策略,建立了闭锁后逆变站输出无功功率的模型;然后,采用所建立的模型,对天中直流"6.14"闭锁后逆变站的输出功率进行建模,并与实测逆变站的输出功率数据进行对比,验证所建模型的准确性较高。最后,将所建模型应用于河南电网仿真算例,仿真结果与实测数据进行对比,进一步验证了该模型的准确性。为适应UHVDC快速的发展,该文所提模型可为含UHVDC的实际电网的分析提供帮助。Abstract: UHVDC projects,which are worthy of long distance transmission of mass electric power,are developed rapidly in China recent years.Due to the high transmission capacity of UHVDC,the blocking events could impact the whole power system significantly.Hence,based on suitable models,the accurate analysis of these impacts is necessary.Firstly,the mechanism of pole power transfer control was analyzed,and then the active power models of UHVDC inverter station were put forward.Secondly,the reactive power model of UHVDC inverter station was proposed based on the mechanism of the reactive power consumption and the switching strategy of reactive power compensation device.Thirdly,based on the proposed models,we modelled the output power of Tianzhong UHVDC inverter station during "6.14" blocking event.Furthermore,compared to the measured data of output power,the accuracy of the proposed models could be found.Finally,in the Henan power grid simulation case,the analysis results from the proposed models were compared with the measured data,which verified the accuracy of the models again.To support the rapid development of UHVDC,the proposed models in this paper could offer insights for the analysis of actual power system including UHVDC.
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