Parameter-adaptive improved VDCM control strategy for energy storage systems

doi:10.19799/j.cnki.2095-4239.2024.0504

Abstract

Abstract:

During the independent operation of DC microgrids, the integration of numerous power electronic conversion devices, coupled with the power fluctuations of renewable energy sources and variable loads, results in reduced inertia, lower damping, and compromised stability. These conditions often cause significant bus voltage fluctuations, potentially threatening the stable operation of the DC microgrid. To address these challenges, this paper investigates an enhanced virtual DC motor (VDCM) control strategy based on parameter adaptation to improve the transient stability of the bus voltage. The control principle of the virtual DC motor is introduced, and a small-signal model of the energy storage control system is established. An in-depth analysis is conducted on the influence of virtual inertia, damping coefficient, and voltage regulator proportional and integral parameters on system stability, highlighting the parameter requirements during each stage of bus voltage fluctuations. Based on this analysis, functional relationships between virtual inertia, proportional coefficient, integral coefficient, and bus voltage deviation are derived. By dynamically adjusting VDCM and voltage regulator parameters in response to voltage deviations, the proposed strategy effectively reduces recovery time under disturbances and minimizes voltage fluctuations. The correctness and feasibility of the proposed control strategy are validated through a hardware-in-loop experimental system utilizing a real-time digital simulator and rapid control prototyping.

Key words: DC microgrid, energy storage control, parameter adaptive, VDCM, hardware-in-loop experiment

CLC Number:

TM 912

Shunqing QIAO, Guizhen TIAN, Jianwei ZHANG, Xiaoyu HAN. Parameter-adaptive improved VDCM control strategy for energy storage systems[J]. Energy Storage Science and Technology, 2024, 13(11): 3993-4004.

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主要参数	数值	主要参数	数值
光伏功率P_pv	15 kW	初始转动惯量J_a	0.01
负载功率P_load	10 kW	初始转动惯量J_b	0.08
阻尼系数D	5	储能系统端口电压	400 V
储能容量C	100 Ah	转动惯量调节系数A	0.01
直流母线电压U_dc	750 V	转动惯量调节系数B	0.02
初始比例系数K_pa	6	调节系数E	15
初始积分系数K_ia	1500	调节系数F	1000

控制策略	母线电压波动幅值	恢复稳定时间
双闭环控制	±9 V	0.64 s
基于J自适应VDCM控制	±6 V	0.48 s
基于参数自适应改进VDCM控制	±4 V	0.24 s

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