直驱风电场并网对系统静态电压稳定性的影响

Influence of Grid-Connected Direct-Drive Wind Farm on Static Voltage Stability of Power System

风电场的大规模接入会对电网静态电压稳定性造成不容忽视的影响。以含直驱风电机组的扩展单机无穷大系统为例,通过2种静态潮流计算方法对含直驱风机的系统等值模型进行分析,推导风电接入后系统并网点母线电压的解析式。在BPA中分别建立含直驱风电机组的扩展单机无穷大系统以及实际电网系统的仿真模型,对比理论计算结果与仿真试验结果。分析并网点母线电压在不同控制方式下,风电渗透率、风机并网位置、负荷接入比例和负荷接入位置等因素对系统静态电压稳定性的影响。

Large-scale access to wind farms would have a significant impact on the static voltage stability of power grid. Taking the extended single-machine infinite bus system with direct-drive wind turbines as an example, the equivalent model of the system with direct-drive wind turbines was analyzed by two static power flow calculation methods, and the analytical formula of bus voltage at the grid-connected point of the system was derived after wind power was connected. The simulation models of the extended single-machine infinite bus system with direct-drive wind turbines and the actual power grid system were established in BPA. The theoretical calculation results and simulation results were compared. The permeability of wind power, the grid-connected position of wind turbines, the load access ratio and the load access position of the bus voltage at the grid-connected point were analyzed under different control modes. The influences of the factors on the static voltage stability of the system were discussed.