考虑混合储能主动参与风光储电站的功率分配与调频策略

Power-Distribution and Frequency-Regulation Strategies for Wind-Solar Power Stations Actively Supported by Hybrid-Energy Storage

针对风光储场站中新能源出力波动及负荷扰动导致系统功率和频率变化的问题,提出多场景下混合储能协调控制策略。首先,针对混合储能过度充放的问题,提出混合储能功率分配策略,该策略通过模糊控制对低通滤波器的时间常数进行自适应调整,基于超级电容的荷电状态(state of charge,SOC)分为5个区域,每个区域根据SOC的变化实时调整时间常数,一定程度上保证了超级电容充放电的合理性;其次,针对混合储能主动支撑风光储场站频率问题,对混合储能逆变器采用虚拟同步机(virtual synchronous generator,VSG)控制,并对转动惯量和阻尼系数进行自适应调整,降低系统因功率扰动造成的频率最大偏差;最后,在PSCAD/EMTDC中搭建风光储场站的仿真模型,通过设置多个场景验证所提策略的有效性。

To address the problem of power and frequency changes caused by fluctuations in new energy output and load disturbances in wind and solar storage stations,a hybrid energy-storage(HES)-coordinated control strategy is proposed for multiple scenarios.First,a strategy for the power distribution of HES was proposed in response to the problem of excessive charging and discharging.This strategy adaptively adjusts the time constant of the low-pass filter using fuzzy control.Based on the state-of-charge(SOC)of the supercapacitor,it is divided into five regions,and each region adjusts the time constant in real-time based on the changes in SOC,ensuring the rationality of the charging and discharging of the supercapacitor to some extent.Second,to address the frequency issue of HES that actively supports wind–solar storage stations,virtual synchronous generator control is adopted for the HES inverter,and adaptive adjustments are made to the moment of inertia and damping coefficient to reduce the maximum frequency deviation caused by power disturbances in the system.Finally,a simulation model of the wind and solar storage station is built in PSCAD/EMTDC,and the effectiveness of the proposed strategy is verified by setting up multiple scenarios.