Battery Optimization Operation Strategy for the

doi:10.11930/j.issn.1004-9649.202405139

Abstract

Abstract:

The soft open points-storage-charger (SSC) device integrates flexible interconnection, energy storage, and charging functions, which can mitigate energy fluctuations in the distribution network. However, during its operation, the frequent utilization of energy storage resources leads to high-power charging and discharging of batteries, thereby affecting their lifespan. To address this issue, a battery optimization operation strategy for the SSC device based on adjustable virtual impedance is proposed. Firstly, the functions of flexible interconnection, energy storage, and charging are all equivalently modeled as virtual impedances. The various energy pathways during the energy fluctuation process in the distribution network are analyzed. By adjusting the virtual impedance, the fluctuating energy can be effectively managed. Based on this, considering the operational characteristics of the SSC device, control methods for the adjustable virtual impedance of each part are proposed, and the physical significance and design principles of key parameters are analyzed. Finally, an experimental platform is built based on a hardware-in-the-loop (HIL) system to verify the theoretical results. The research demonstrates that the proposed method can mitigate voltage fluctuations in the distribution network while reducing the magnitude of charging and discharging currents in the energy storage system, thereby improving battery lifespan.

Key words: renewable energy distribution network, SOP-storage-charger device, energy storage, virtual impedance, battery lifespan, charging and discharging

QIN Kun, QU Zhijiang, HAN Jianwei, XU Tao, GAO Feng, CHI Xiaoli. Battery Optimization Operation Strategy for the "SOP-Storage-Charger" Devices Based on Adjustable Virtual Impedance[J]. Electric Power, 2025, 58(6): 145-155.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202405139

https://www.electricpower.com.cn/EN/Y2025/V58/I6/145

Figures/Tables 16

Fig.1 Diagram of the SSC device connected to the distribution network

Fig.2 Topology diagram of the SSC device

Fig.3 Diagram of the adjustable virtual impedance of the SSC device

Fig.4 Main control block diagram of the output power control side of the SOP

Fig.5 Main control block diagram of the DC voltage control side of the SOP

Fig.6 Main control block diagram of the battery energy storage system

Fig.7 Main control block diagram of the charging system

Fig.8 Experimental platform based on HIL

Fig.9 Schematic diagram of the internal circuit structure of HIL

Table 1 Main control parameters of the SSC device

参数		数值
柔性互联电压控制环P调节器		5
柔性互联电压控制环I调节器		0.1
柔性互联电流控制器环P调节器		0.05
柔性互联电流控制器环I调节器		10
柔性互联虚拟电阻R_sop/Ω		0.1~10，可调
柔性互联虚拟电感L_sop/mH		1
储能电流控制环P调节器		0.01
储能电流控制环I调节器		1
充电电流控制环P调节器		0.01
充电电流控制环I调节器		1

Fig.10 Waveform of the output power of a pulse-type power source

Fig.11 Trajectory of the peak value changes of phase voltage for the two-end distribution network

Fig.12 Voltage waveform of the two-end distribution network before the connection of the SSC device

Fig.13 Waveform diagram of the u1, iB, and i1 when using traditional methods

Fig.14 Waveform diagram of the u1, iB, and i1 after using virtual impedance control in SOP and battery storage system

Fig.15 Waveform diagram of the u1, iB, i1 and iC after using virtual impedance control in SOP, battery storage system and charger

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