基于PSCAD/EMTDC的高压直流输电准稳态模型的仿真验证  

Simulation Verification of Quasi-Steady State Model of HVDC Transmission Based on PSCAD/EMTDC

作　　者：孙慧平 王西田[2] 戴俊杰 SUN Huiping;WANG Xitian;DAI Junjie(StateGrid Shanghai Municipal Electric Power Company,Shanghai 200122,China;Departmentof Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;State Grid Changxing PowerSupply Company,SMEPC,Shanghai 201913,China)

机构地区：[1]国网上海市电力公司,上海200122 [2]上海交通大学电气工程系电力传输与功率变换控制教育部重点实验室,上海200240 [3]国网上海市电力公司长兴供电公司,上海201913

出　　处：《电力与能源》2022年第5期385-388,共4页Power & Energy

基　　金：国家自然科学基金项目(50807036);国家科技计划课题(2008BAA13B08)。

摘　　要：在高压直流输电(HVDC)的稳定问题研究中,往往采用准稳态模型来描述HVDC系统的动态过程。准稳态模型用平均值方程来描述HVDC系统交流侧和直流侧的联系,忽略交流系统的影响,具有较好的运算速度。对HVDC系统建立了详细的准稳态模型,在PSCAD/EMTDC中利用其自定义建模功能建立了HVDC系统的准稳态仿真模型,与PSCAD/EMTDC元件库中的HVDC电磁暂态模型进行仿真比较,对比不同频率扰动下交直流系统相关状态变量的时间响应曲线,定量地验证了HVDC准稳态模型在不同频段的适用性。仿真结果显示:在换流站交流母线电压对称的情况下,二者的仿真结果在扰动频率较低时吻合度很高;在电力系统的低频振荡分析中可以使用准稳态模型,在次同步振荡分析中若振荡频率较低时该模型也有较好的精度,但振荡频率较高时,该模型的精度变差。In the study of HVDC stability, the quasi-steady state model is often used to describe the dynamic process of HVDC system. The quasi-steady state model uses the mean value equation to describe the relationship between the AC side and the DC side of the HVDC system, and ignores the influence of the AC system, so it has a better calculation speed. A detailed quasi-steady state model of HVDC system is established, and a quasi-steady state simulation model of HVDC system is established in PSCAD/EMTDC by using its custom modeling function. Compared with the HVDC electromagnetic transient model in the PSCAD/EMTDC component library, the time response curves of relevant state variables in the AC/DC system under different frequency disturbances is compared, and the applicability of the HVDC quasi-steady state model in different frequency bands is quantitatively verified. The simulation results show that when the AC bus voltage of the converter station is symmetrical, the simulation results have a good agreement when the disturbance frequency is low. The quasi-steady state model can be used in the analysis of low-frequency oscillation of the power system. In the analysis of sub-synchronous oscillation, if the oscillation frequency is low, the model also has a good accuracy;when the oscillation frequency is high, the accuracy of the model is decreased.

关 键 词：电力系统 高压直流输电 准稳态模型 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM743