基于不对称运行下换相过程的改进换流器动态相量模型  

Dynamic phase measurement model of the improved converter during phase change process based on asymmetric operation

作　　者：王磊[1] 张澜芯 Wang Lei;Zhang Lanxin(Renewable Energy and Industrial Energy Saving Engineering Laboratory of Anhui Province,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学可再生能源与工业节能安徽省工程实验室,合肥230009

出　　处：《电测与仪表》2020年第10期121-126,133,共7页Electrical Measurement & Instrumentation

基　　金：国家重点研发计划智能电网技术与装备重点专项(2016YFB0900601);国家电网公司科技项目(52094017000W)。

摘　　要：为充分研究大规模交直流混联系统动态特性,建立准确而高效的换流器数学模型是当前的关键问题。文章分析了交流系统在不对称故障情况换流器的换相过程,综合考虑了换相电压的相位偏移引起的换相电压过零点偏移和导通角偏移,以及交流系统的谐波等对换相持续时间的影响,提出了改进的换相角动态相量计算方法,建立了适用于不对称运行条件下的改进换流器动态相量模型,并通过选取主要谐波简化了模型的计算过程。仿真验证了所提出的改进换流器动态相量模型的精度和准确性。In order to study the dynamic characteristics of large-scale AC-DC hybrid systems,it is a key problem to establish an accurate and efficient converter mathematical model. In this paper,the commutation process of converter in the case of asymmetrical fault is analyzed,and the zero-crossing migration and on-angle migration of commutative voltage caused by phase shift of commutative voltage are considered synthetically,as well as the influence of harmonics of AC system on the duration of commutation,an improved method for calculating the dynamic phasor of commutation angle is established,and an improved dynamic phasor model of converter suitable for asymmetric operation condition is proposed. The calculation process of the model is simplified by selecting the main harmonics. The precision and accuracy of the proposed improved convertor dynamic phasor model are verified by simulation.

关 键 词：不对称运行 换流器 换相角 动态相量模型 

分 类 号：TM933[电气工程—电力电子与电力传动]