考虑锁相环和换相失败的LCC-HVDC闭环动态相量仿真模型  

Closed-loop Dynamic Phasor Simulation Model of LCC-HVDC Considering Phase-locked Loop and Commutation Failure

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),Changping District,Beijing 102206,China;State Key Laboratory of HVDC(Electric Power Research Institute,China Southern Power Grid),Guangzhou 510663,Guangdong Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]直流输电技术国家重点实验室(南方电网科学研究院有限责任公司),广东省广州市510663

出　　处：《中国电机工程学报》2021年第9期3046-3055,共10页Proceedings of the CSEE

基　　金：南方电网公司科技项目(ZBKJXM20180104)。

摘　　要：为解决交直流混联系统暂态响应难以快速精确求解的问题,文中基于动态相量法基本原理,对电网换相换流器型高压直流输电(line commutated converter high voltage direct current,LCC-HVDC)全系统进行详细的建模推导。首先建立含锁相环的换流器动态相量模型,通过将锁相环输出与改进开关函数相结合,准确还原换流器的工作过程,提高计算的速度和精度。随后,通过对直流线路和控制系统的精确建模,实现了系统的闭环计算。同时,针对逆变侧易出现的换相失败情况,提出复合判据和开关函数修正法对其进行快速判断和处理,拓展模型的适用性。将所建模型应用于CIGRE Benchmark标准直流系统,多故障类型下的仿真结果进一步证明了其相较于传统动态相量模型的优势。In order to solve the problem that the transient response of AC/DC hybrid system is difficult to calculate quickly and accurately, a detailed modeling of the entire LCC-HVDC system was carried out based on the dynamic phasor method in this paper. Firstly, the dynamic phasor model of converter with phase-locked loop(PLL) was established. By combining the output of PLL with an improved switching function, the working process of the converter was accurately restored, and the calculation speed and accuracy were improved. Subsequently, through accurate modeling of the DC line and control system, the closed-loop calculation of the system was realized. At the same time, for commutation failure that is easy to occur on the inverter side, a composite criterion and a switching function modification method were proposed to judge and process it quickly, which expands the applicability of the model. The model built in this paper was applied to the CIGRE Benchmark standard system, and the simulation results under multiple fault types further proved its advantages over traditional dynamic phasor models.

关 键 词：电网换相换流器型高压直流输电 动态相量法 锁相环 闭环计算 换相失败 

分 类 号：TM721[电气工程—电力系统及自动化]