含风电场的MMC-MTDC系统通用频率响应模型  

General Frequency Response Model of MMC-MTDC System Integrated with Wind Farms

作　　者：刘昊宇 刘崇茹 董浩云 LIU Haoyu;LIU Chongru;DONG Haoyun(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,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102206

出　　处：《电力系统自动化》2023年第5期123-133,共11页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2022YFB2402700)。

摘　　要：研究含风电场的基于模块化多电平换流器的多端柔性直流(MMC-MTDC)输电系统频率响应特性意义重大。但时域仿真建模过程复杂,不适用于理论分析,亟须提出完整的风电场与MMCMTDC系统的频率-有功功率-直流电压动态特性分析模型。为此,利用模块化多电平换流器平均值模型交直流侧解耦的特点,独立对电网侧变流器(GSC)交流侧和发电机进行等值建模。计及背靠背变流器、汇集交流线路和风电场侧变流器(WFC)损耗的前提下,根据功率转移规律完成了直驱风机和WFC中间环节化简。以直流线路作为交互端口,结合GSC和WFC等值模型,采用模块化建模方法组建了含风电场的MMC-MTDC系统的有功类分量小信号模型。仿真结果表明,通用频率响应模型能准确模拟频率小扰动的动态过程,并进行稳定性分析,为控制系统参数整定提供参考。It is of great significance to study the system frequency response characteristics of the modular multilevel converter based multi-terminal direct current(MMC-MTDC)transmission system integrated with wind farms.However,the time-domain simulation modeling process is complicated and is not suitable for theoretical analysis.Thus,it is urgent to develop a complete dynamic characteristic analysis model of frequency,active power and DC voltage for wind farms and the MMC-MTDC system.Therefore,taking advantage of the decoupling characteristics of the AC and DC sides in the average model of MMC,the AC side of the grid side converter(GSC)and the generators are independently modeled.Considering the losses of back-to-back converters,AC collection lines and the wind farm converter(WFC),the intermediated links of direct-drive wind turbine and WFC are simplified according to the power transfer law.Based on the equivalent models of the GSC and WFC,the DC lines are used as the interactive ports,and the small-signal model of active components of the MMC-MTDC system integrated with wind farms is established by the modular modeling method.The simulation results show that the general frequency response model can accurately simulate the dynamic process after the small frequency disturbance,and can be used for stability analysis,which provides a reference for parameter tuning of the control system.

关 键 词：多端柔性直流输电系统 模块化多电平换流器 直驱风机 频率控制 小信号模型 平均值模型 频率响应特性 模块化建模 

分 类 号：TM614[电气工程—电力系统及自动化] TM721.1