高风电渗透率下考虑电网频率支撑需求的储能系统配置方法

Configuration method of energy storage system considering grid frequency support demand under high wind power penetration

提出了一种高风电渗透率下考虑电网频率支撑需求的储能系统配置方法。以频率变化率和频率偏差为限制条件,建立新能源系统所能承受的最大功率增量与等效惯性常数、调差系数以及风电渗透率等已知参数的联系。通过对3阶虚拟同步机控制策略下的储能系统容量与控制参数进行量化配置,提高不同风电渗透率系统对不平衡功率的消纳能力。以储能配置在频率支撑中贡献的等效单位调节功率为参考,对不同功率增量下储能系统的频率响应贡献、调频出力占比以及输出功率特性进行刻画与分析。仿真验证了该配置方法下的储能系统可控性强,能够较为精准地提供电网所需的有功调节量,有效改善风电并网环境。

A configuration method of energy storage system considering the grid frequency support demand under high wind power penetration is proposed.The frequency change rate and the frequency deviation are taken as the restricted conditions to establish the relationship between the maximum power increment that the new energy system can withstand and the known parameters such as equivalent inertia constant,adjustment coefficient,wind power permeability,and so on.The capacity and control parameters of the energy storage system under the control strategy of the third-order virtual synchronous generator are quantitatively configured to improve the ability of different wind power penetration system for absorbing unbalanced power.Taking the unit power regulation contributed by the energy storage system as a reference,the frequency response contribution,frequency modulation output ratio and output power characteristics of the configuration method are described and analyzed when different power increments are generated.The simulative results show that the energy storage system under this configuration method has strong controllability,which can provide the active power regulation required by the grid more accurately,so as to effectively improve the wind power grid environment.