平抑电网大功率扰动的规模化电池储能系统控制方法

Control Method of Large-Scale Battery Energy Storage System for Suppressing the Disturbance of Power Grid

为了满足电网调控需求,提出了规模化电池储能系统平抑电网故障下大功率扰动的优化控制方法。基于电网频率、电压与有功、无功功率的平衡关系,首先建立了考虑电池荷电状态约束的规模化电池储能系统有功、无功功率控制模型,该控制模型包含测量滤波环节、增益环节、死区环节、控制环节等完整环节,在此基础上推导出适用于电网调控的规模化电池储能系统调频、调压控制模型。针对不同容量电池储能系统和电网的调控需求,应用改进的响应曲线法对模型中的控制参数进行优化,从而提高控制系统的灵活性和适应性。最后,应用PSASP软件验证了规模化电池储能系统平抑电网故障下大功率扰动的优化控制方法的有效性。结果表明:当电网大功率扰动引起电网频率、电压异常时,提出的规模化电池储能系统有功、无功控制方法可将系统频率控制在49. 8~50. 2 Hz,将母线电压控制在UN±10%UN,满足系统频率电压要求。

In order to meet the demand of power grid regulation,this paper proposes an optimal control method for large-scale battery energy storage to suppress the disturbance of power grid. According to the balance relationship among grid frequency,voltage,active power and reactive power,this paper firstly establishes a power control model of large-scale battery energy storage system considering the battery state of charge constraints. The control model includes measurement filtering,gain,dead zone,control and other complete links. On this basis,the frequency-modulation and voltage-regulation control model of large-scale battery energy storage suitable for grid regulation is derived. According to the regulation requirements of power grid and battery energy storage system with different capacity,the improved response-curve method is applied to optimize the control parameters in the model,so as to improve the flexibility and adaptability of the control system. Software PSASP is used to verify the effectiveness of the optimal control method of large-scale battery energy storage to suppress the disturbance of power grid. The results show that the system frequency can be controlled between 49. 8~ 50. 2 Hz and the bus voltage can be controlled between UN± 10% UNusing the proposed power control method when the grid frequency and voltage are abnormal due to large power disturbance.