支撑大规模风电集中接入的自律协同电压控制技术

Autonomous-Synergic Voltage Control Technology Supporting Large-scale Wind Power Integration

国内多个风电汇集区域具有大规模风电汇集馈入电网薄弱环节的典型特征,由此带来了电压波动和连锁脱网等运行挑战。文中提出了自律协同的电压控制框架,利用风电场侧自律控制协调静止无功补偿器/静止无功发生器/风电机组/电容电抗器等不同时间常数的调节设备,从而抑制间歇性风电出力诱发的电压波动;在系统级实现协同控制,在正常情况下通过可自适应于风功率变化的敏捷二级电压控制减小电压波动,在脱网风险较大时利用基于安全约束最优潮流(SCOPF)的预防控制保证汇集区域正常且安全的运行状态。该架构的若干关键技术已经在国内多个风电基地和风电场应用,现场运行结果表明了其控制有效性。

Large-scale wind power integrated into a weak grid is a typical feature for many wind pool areas in China,hence the voltage fluctuation and wind turbine generators （WTGs） cascading trip-off challenge to operation.An autonomous-synergic voltage control architecture is proposed. On the wind farms side, the autonomous controller coordinates static var compensators （SVCs）,static var generators （SVGs）,WTGs and capacitors to suppress voltage fluctuations.On the control center side,an agile flexible secondary voltage controller capable of adj usting its control period adaptively according to the wind power variation is proposed to retain a better voltage profile.Moreover,a security-constrained optimal power flow （SCOPF） based preventive control will be carried out should the cascading trip risk get too high.Some of the key technologies of this architecture have been implemented in several wind bases and wind farms in China,the effectiveness exhibited by real-life operation experience.