Black-Start Coordinated Control Strategy of Optical Storage Microgrid Considering State of Charge Balance of Distributed Energy Storage

doi:10.16183/j.cnki.jsjtu.2023.395

Abstract

Abstract:

With the increasing proportion of new energy in the power grid, photovoltaic microgrids equipped with large-capacity distributed energy storage have the potential to support the black start of thermal power plants. To address this issue of frequent fluctuation in the active power of the microgrid during the black-start period, and the risk of exceeding the state of charge (SOC) limits of the distributed energy storage, which could lead to the failure of the black-start, a coordinated control strategy for the optical storage microgrid black-start is proposed considering the SOC balance of the distributed energy storage. Based on the SOC of the distributed energy storage unit, the proposed strategy combines the load tracking control of the photovoltaic system and the maximum power tracking (MPPT) control, which ensures that the photovoltaic output effectively tracks the microgrid load to prevent the SOC from exceeding its limit. When the photovoltaic output becomes unbalanced with the black-start load, the distributed energy storage system is used to smooth the active power difference of the system. Furtherfore, the droop control for the traditional energy storage units is improved to ensure the active power distribution based on the energy storage SOC, enabling the SOC balance among energy storage units. Through secondary control of the energy storage units based on distributed consensus protocol, the strategy ensures frequency stability in the active power fluctuation during the black start process. The simulation results verify the feasibility of black start and the effectiveness of the proposed control strategy.

Key words: optical storage system, black start of island microgrid, load tracking, distributed energy storage, state of storage (SOC) equilibrium

CLC Number:

TM614

ZHOU Xia, CHEN Wenjian, DAI Jianfeng, XIE Xiangpeng. Black-Start Coordinated Control Strategy of Optical Storage Microgrid Considering State of Charge Balance of Distributed Energy Storage[J]. Journal of Shanghai Jiao Tong University, 2025, 59(7): 938-951.

Figures/Tables 14

Fig.1

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Fig.7

Tab.1

Tab.2

Tab.3

Parameters of droop controller

参数	取值	参数	取值
m₀	0.05	γ₀	1
c	9	v	2
γ_i上限,γ_max	6	γ_i下限,γ_min	1
$α ω -$	0.5	无功下垂系数,n_q	0.002

Tab.3

Fig.8

Fig.9

Fig.10

Fig.11

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参数	取值	参数	取值
额定功率/MW	2	额定电压/V	380
储能单元数	4	储能升压变变比	380/33 000
电池充电保护值/%	80	电池放电保护值/%	20

参数	取值	参数	取值
额定功率/MW	2	额定线电压/kV	6
电动机基准角频率/ (rad·s^-1)	314.1593	定子绕组电阻/MΩ	0.01
转子绕组电阻/MΩ	0.02	定子绕组电感/mH	0.5
转子绕组电感/H	0.42	辅机漏感/H	2.1