风电与多端柔性直流输电系统自适应分频协调控制策略研究  

Research on adaptive frequency division coordinated control strategy for wind power and multi terminal flexible HVDC transmission system

作　　者：李从善 甄子凯[1] 和萍 武小鹏 范嘉乐 张晓伟 LI Congshan;ZHEN Zikai;HE Ping;WU Xiaopeng;Fan Jiale;ZHANG Xiaowei(School of Electrical and Information Engineering,Zhengzhou University of Light Industry,Zhengzhou 450000,China;School of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]郑州轻工业大学电气信息工程学院,河南郑州450000 [2]四川大学电气工程学院,四川成都610065

出　　处：《电力科学与技术学报》2024年第1期65-73,92,共10页Journal of Electric Power Science And Technology

基　　金：河南省高等学校重点项目(23A470011);智能电网四川省重点实验室2022年开放基金项目(2022‑IEPGKLSP‑KFYB01)。

摘　　要：针对风电接入多端柔性直流输电系统,为充分发挥风电参与系统调频能力,解决交直流并网故障引起的直流系统电压和交流电网频率波动问题,本文在现有下垂控制基础上提出了附加自适应分频控制策略。将直流电压偏差信号作为控制器输入信号,通过一阶低通滤波器将输入信号分为高频波动信号和低频波动信号,根据风电和直流输电系统各自调频能力的不同,将高频波动信号附加在风电机组转子侧换流器有功功率控制环,低频波动信号附加在直流有功功率控制外环,同时将电压源换流器(voltage source converter,VSC)实时功率裕度与直流电压变化量引入分频控制,实时调整低通滤波器的时间常数,动态调整功率输出,提高系统稳定性。在PSCAD/EMTDC中搭建仿真模型,仿真验证所提控制策略的有效性。In response to the integration of wind power into the multi terminal flexible DC transmission system,this paper proposes an additional adaptive frequency division control strategy on the basis of existing droop control,in order to fully utilize the wind power's participation in system frequency regulation ability and solve the voltage and frequency fluctuations caused by AC/DC grid connection faults in the DC system.The DC voltage deviation signal is taken as the input signal of the controller,and the input signal is divided into high-frequency fluctuation signal and low-frequency fluctuation signal through the first-order low-pass filter.According to the different frequency modulation capabilities of the wind power and DC transmission systems,the high-frequency fluctuation signal is added to the active power control loop of the converter at the rotor side of the wind turbine,and the low-frequency fluctuation signal is added to the external loop of the DC active power control,At the same time,voltage source converter(VSC)real-time power margin and DC voltage variation are introduced into frequency division control to adjust the time constant of the low-pass filter in real time and dynamically adjust the power output to improve system stability.A simulation model is built in PSCAD/EMTDC to verify the effectiveness of the proposed control strategy.

关 键 词：风力发电 下垂控制 自适应分频控制 高频波动 低频波动 协调控制 

分 类 号：TM712[电气工程—电力系统及自动化]