考虑风电预测及电压分布的风电场无功设备协调控制优化研究

Study on Coordination Control Optimization of Reactive Power Equipment of Wind Farm Considering Wind Power Prediction and Voltage Distribution

为解决风电场内多类型设备导致的风力发电间电压偏移和场站内无功分配协调控制研究不足的问题,本文在传统风电场AVC系统的基础上,提出考虑大型风电场内所有风电机组电压控制水平及动态无功储备的多目标控制方法,首先分别计算考虑风机机端电压均衡分布后的每个风电场的所有风力发电机组和无功补偿设备的总无功功率的可调节容量,其次根据超短期风功率预测,确定离散型无功设备的投切计划,使用最小二乘拟合法获得系统安全系数与所有无功补偿设备调节量之间的函数,然后基于最优潮流计算考虑电压偏差、无功调节量最小、动态无功储备满足故障后要求等多目标约束获取无功补偿设备的最佳设定值。最后,本文通过甘肃电网某实际风电场验证了该方法的有效性。

For solving such problem as voltage excursion between wind power generation and insufficient study of reactive power distribution coordination in the filed due to multi-type equipment in wind farms,in this paper,the multi-objective control method considering voltage control level and dynamic reactive reserve of all wind power turbines of large wind farm is proposed on the basis of traditional wind farm AVC system.Firstly,the adjustable capacity of total reactive power considering all wind power generator and reactive power compensation equipment of each wind farm after equal distribution of terminal voltage of wind turbine generator is calculated,then the switching plan of discrete reactive power equipment is defined according to the ultra-short-term wind power prediction so to obtain the function between the system safety factor and the adjustment of all reactive power compensation equipment by the use of least squares fitting method.Then,such multi-target constraint as,voltage deviation consideration,minimum reactive power adjustment,dynamic reactive reserve meeting requirement after the fault are considered based on optimal flow calculation so to obtain the most optimal setting of the reactive power compensation equipment.Finally,the effectiveness of the method is verified through an actual wind farm in Gansu power grid.