摘要
为实现多故障类型下对高压直流输电(high-voltage direct-current,HVDC)系统进行快速精确的闭环计算,使用动态相量法对包括换流变压器在内的完整HVDC系统进行了详细的建模推导。首先分析了交流不对称情况下实际触发角的偏移和各换相过程的不平衡情况,提出了适用于不对称故障的改进换流器动态相量模型。随后,使用考虑电压损耗的换流变压器模型代替理想变压器模型,提高了阀侧交流电压的计算精度,并结合直流线路动态相量模型,重构了HVDC全系统的仿真流程,实现了系统的闭环计算。将所建模型应用于CIGRE Benchmark标准直流系统,并与PSCAD仿真结果进行对比,结果证明了所提模型准确有效。
In order to realize the rapid and accurate closed-loop calculation of high-voltage direct-current(HVDC)system under multiple fault types,dynamic phasor method is used to model the complete HVDC system including converter transformers.Firstly,in the case of AC asymmetry,the deviation of the actual firing angle and the unbalance of each commutation process are analyzed.Then,an advanced dynamic phasor model for converter,which is suitable for asymmetric faults,is proposed.Subsequently,the ideal converter transformer model is replaced with a new one that considers voltage loss,which improves the calculation accuracy of the AC voltage on the valve side.By combing it with the dynamic phasor model of DC line,the simulation process of HVDC system is reconstructed and closed loop calculation is realized.Based on the CIGRE Benchmark standard system,the proposed model is compared with the simulation results from PSCAD,and the result further proves the effectiveness.
作者
单俊儒
刘崇茹
李欢
魏伟
SHAN Junru;LIU Chongru;LI Huan;WEI Wei(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Key Laboratory of HVDC,Electric Power Research Institute,CSG,Guangzhou 510663,China)
出处
《南方电网技术》
CSCD
北大核心
2021年第4期10-18,共9页
Southern Power System Technology
基金
中国南方电网有限责任公司科技项目(ZBKJXM20180104)。
