摘要
对于输送大规模风电的特高压直流,目前实际运行中主要通过调度部门对直流输送功率进行干预和调整,且一定时间内大范围调整直流功率会引起交流滤波器频繁投切,大大降低设备使用寿命。本文提出了通过直流系统的频率控制器利用换流站本地信息对直流功率进行自动调制,并提出了频率控制器关键参数的选取原则和方法;研究了直流系统无功控制设置为定交流电压的U控模式并提出了电压死区和电压参考值选取方法,能够在直流针对风电功率波动的调制过程中大大减少交流滤波器投切次数,同时避免交流电压大范围波动。通过与实际工程极控系统一致的仿真模型进行验证,仿真结果表明:所提出的适应性控制策略可行、有效,能在直流系统跟随风电功率波动自动调制直流功率的同时,完成对系统频率和电压的控制。
For UHVDC project that transmitting large-scale wind power,the DC power is adjusted by the dispatching department in actual operation.Large-scale adjustment of DC power in a certain period will cause AC filters switching frequently,and the service life of the equipment will be greatly reduced.In this work,the DC power will be automatically modulated by the frequency controller of DC control system based on local information,and the selection principle and method of key parameters of frequency controller are proposed.The U-control mode of reactive power control is recommended and the selection method of voltage dead zone and voltage reference value is proposed.Under the control strategy above,the switching frequency of AC filters could be greatly reduced during peak shaving of wind power fluctuation,while AC voltage remaining stable.The simulation results show that the proposed adaptive control strategy is feasible and effective.It can adjust DC power with the fluctuation of wind power,and control the frequency and voltage stability of the system at the same time.
作者
孔祥平
雷霄
刘琳
孙栩
李新年
周亦夫
林少伯
KONG Xiang-ping;LEI Xiao;LIU Lin;SUN Xu;LI Xin-nian;ZHOU Yi-fu;LIN Shao-bo(State Grid Jiangsu Electric Power Co.,Ltd.Research Institute,Nanjing 211103,China;China Electrical Power Research Institute,Beijing 100192,China)
出处
《电工电能新技术》
CSCD
北大核心
2020年第7期30-36,共7页
Advanced Technology of Electrical Engineering and Energy
基金
国家电网公司科技项目“特高压直流控制保护系统现场测试及运维优化关键技术研究与应用”(5210EF180013)。
关键词
特高压直流
风电
极控系统
频率控制
无功功率控制
UHVDC
wind power
pole control system
frequency control
reactive power control
