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为了有效抑制光伏发电的波动性和随机性,提高光伏微电网系统的稳定性,提出了含混合储能的光伏微电网系统在并/离网运行及模式切换时储能设备和直流母线电压的协调控制策略。设计了功率分配型二阶低通滤波控制策略对系统功率波动进行分配,结合储能元件的荷电状态SOC(state-of-charge)来控制各变换器的工作状态,实现储能元件在充放电及空闲模式间的切换。同时储能工作状态控制光伏发电单元使用改进的变步长扰动观察法,或恒压降功率控制法。通过统一与独立协调控制来维持系统稳定运行。利用Matlab/Simulink搭建仿真平台,验证了所提协调控制策略的可行性与正确性。
Abstract：To effectively suppress the fluctuations and randomness in photovoltaic(PV)power generation and improve the stability of a PV micro-grid system,a coordinated control strategy for the energy-storage device and DC bus voltage during the grid-connected/islanded operation and mode switching of the PV micro-grid system with hybrid energy-storage is proposed. A power distribution type second-order low-pass filter control strategy is designed to distribute the system's power fluctuations,which is combined with the state-of-charge(SOC)of the energy-storage device to control the operating states of each converter,thus realizing the switching between charging,discharging and idle modes of the energy-storage device. Meanwhile,the operating state of energy-storage can control the PV power generation cell using the improved variable step-size disturbance observation method or constant voltage drop power control method. In addition,the system's stable operation is maintained through unified and independent coordinated control. At last,Matlab/Simulink is used to build a simulation platform to verify the feasibility and correctness of the proposed coordinated control strategy.
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基本信息:
DOI：10.19635/j.cnki.csu-epsa.000551
中图分类号:TM615
引用信息:
[1]卢锦玲,张伟,张祥国,等.含混合储能的光伏微电网系统协调控制策略[J].电力系统及其自动化学报,2021,33(08):102-108.DOI:10.19635/j.cnki.csu-epsa.000551.
2020-04-10
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2020-05-21
2020-05-25
2020
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2020-09-21
2020-09-21
2020-09-21