摘要
针对弱连接并网风电场电压稳定性易受风功率波动影响,提出了一种基于分层模型预测控制(MPC)的风电场电压协调控制策略。首先,建立自适应调节层,根据风电场无功补偿能力以及有功预测信息对并网点电压进行预测,实现对并网点电压的自适应调整。其次,建立无功分配层,通过计算风电机组在无功补偿中所需要的无功容量,根据不同风电机组的无功裕度对其无功出力进行分配。最后,根据跟踪控制层的反馈信息对电压控制的误差进行修正,从而达到对弱连接并网风电场无功电压的有效控制。仿真结果表明:提出的无功电压控制策略实现了对无功输出的自适应调整,并可有效地解决风电场存在的无功缺额问题;保证了在多种情况下的风电场并网电压控制的稳定性;通过分层MPC,各层内不同时间级的预测信息可被高效利用,各层间不同时间尺度的控制亦可得到有效协调。
Aiming at the problem that the voltage stability of weakly connected grid-connected wind farms is susceptible to wind power fluctuations,a hierarchical model predictive control(MPC)based coordinated control strategy for wind farm voltage was proposed.First,an adaptive adjustment layer was established to predict the grid-connected point voltage based on the wind farm's reactive power compensation capability and active power prediction information,and to achieve adaptive adjustment of the grid-connected point voltage.Secondly,a reactive power distribution layer was established,through calculating the reactive power capacity required by the wind turbine in reactive power compensation,its reactive power output according to the reactive power margin of different wind turbines was distributed.Finally,the voltage control error was corrected according to the feedback information of the tracking control layer,so as to achieve effective control of the reactive voltage of the weakly connected grid-connected wind farm.The simulation results show that the proposed reactive voltage control strategy realizes the adaptive adjustment of the reactive power output,and can effectively solve the problem of reactive power shortage in the wind farm.It guarantees the grid-connected voltage control of the wind farm in various situations stability of layers.Through hierarchical MPC,the prediction information at different time levels in each layer can be efficiently used,and the control of different time scales between each layer can also be effectively coordinated.
作者
王海军
王磊
WANG Haijun;WANG Lei(Electric Engineering Technology Research Institute of Inner Mongolia Energy Power Investment Group Co.,Ltd.,Hohhot 010060,Nei Monggol,China)
出处
《电气传动》
2022年第1期60-67,80,共9页
Electric Drive
基金
内蒙古自治区科技厅项目(JJKH20190976KJ)。
关键词
风电场
模型预测控制
无功电压控制
自适应调整
wind farm
model predictive control(MPC)
reactive voltage control
adaptive adjustment
