摘要
针对大容量海上风电接入电网导致系统惯性下降,频率不稳定风险增大的问题,提出了一种变惯性协调控制策略。该协调控制策略中,网侧换流器采用虚拟惯性控制基础,并根据直流电压改变其惯性系数,从而更有效利用直流电容进行惯性支撑。风场侧换流器根据直流电压变化改变海上电网频率,将岸上频率变化传递到海上风电场,风电机组根据频率的变化率和自身转速,调节惯性系数,实现风机变惯性控制,从而提供更多的惯性支撑功率,减小风机转速恢复阶段输出功率下降。仿真结果表明,所提协调控制策略能够有效提升陆上系统惯性,提高系统频率稳定性。
In order to solve the problem of decreasing system inertia and increasing frequency instability risk caused by large capacity offshore wind power connected to the power grid, a variable inertia coordinated control method is proposed. In the coordinated control strategy, the grid side converter adopts the virtual inertia control basis, and changes its inertia coefficient according to the DC voltage, so as to more effectively use the DC capacitor for inertia support. The windfarm side converter changes the frequency of the offshore power grid according to the change of the DC voltage, and transmits the change of the onshore frequency to the offshore wind farm. The wind turbine unit adjusts the inertia coefficient according to the change rate of the frequency and its own speed, so as to provide more inertia support power and reduce the decrease of the output power during the recovery phase of the wind turbine speed. The simulation results show that the proposed coordinated control strategy can effectively enhance the inertia of the land system and improve the frequency stability of the system.
作者
黄宇昕
倪世杰
赵平
李振兴
HUANG Yuxin;NI Shijie;ZHAO Ping;LI Zhenxing(College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,Hubei Province,China;Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station,China Three Gorges University,Yichang 443002,Hubei Province,China)
出处
《分布式能源》
2022年第6期1-10,共10页
Distributed Energy
基金
国家自然科学基金项目(52077120)。
关键词
海上风电
柔性直流输电
虚拟惯性
频率响应
协调控制
offshore wind farm
flexible DC transmission
virtual inertia
frequency response
coordinated control
