基于变减载率的光伏发电参与电网调频控制策略

A New Frequency Regulation Control Strategy for Photovoltaic Power Plant Based on Variable Power Reserve Level Control

新能源机组大量接入电网降低了电力系统旋转惯性和一次调频资源,导致电网运行时频率波动增大。新能源机组主动参与频率调节是缓解该问题的途径之一,为此提出一种基于变减载率的光伏发电机组参与电网调频控制策略,依据电网频率改变光伏机组减载运行水平,使其能够参与向上/向下的电网频率调节。该策略结合离线曲线拟合、在线功率跟踪和实时光照强度估算,能与最大功率跟踪算法无缝融合,并对曲线拟合误差有一定的鲁棒性。基于RT-LAB的半物理仿真结果验证了该方法的有效性。

The increasing installed capacity of renewable power generation deceases the rotational inertia and primary frequency regulation resource in power system, result into frequency fluctuating larger during power system operation. The renewable power generation participate power system frequency regulation is one efficient way for releasing this problem. The focus of this paper is to develop a new frequency regulation control strategy for photovoltaic (PV) power plant, which enables PV power plant to adjust the active power reserve level depending on the grid frequency, and participate the under/up frequency response. The strategy combine off-line curve fitting algorithm, on-line power tracking and irradiance estimation.it can seamless integrate with the exited maximum power tracing, and enhance the robustness for the off-line curve fitting error. The semi-physical simulation platform based on RT-LAB was built and the results verify the effectiveness of the proposed strategy.