Design of DC direct-mounted energy storage device with cascaded half-bridge topology

doi:10.19799/j.cnki.2095-4239.2023.0825

Abstract

Abstract:

The escalation in the construction of new energy sources, such as offshore wind power and photovoltaics, has increased the demand for applications in DC transmission, AC-DC interconnection, and energy storage. Presently, research and applications in energy storage technology predominantly focus on AC energy storage. Although the modular multilevel converter based battery energy storage system (MMC-BESS) facilitates energy storage while interconnecting AC and DC networks, the presence of pulsating current components, including power and double frequencies, in the battery can adversely affect battery life. Moreover, the cost associated with retrofitting traditional modular multilevel converter (MMC) converter stations is significant. The proposed DC direct-mounted energy storage device decouples the converter and energy storage functions, ensuring that the battery current comprises only DC and high-frequency pulsation components, thus offering a battery-friendly operating environment. Furthermore, the DC direct-mounted energy storage system necessitates merely one-sixth the number of battery cells required by MMC-BESS, leading to cost reductions. This paper delves into the topology structure and operational principles of DC direct-mounted energy storage devices, designs the quantity and parameters of cascaded submodules, calculates the DC ripple current through carrier phase-shift modulation, and designs the parameters of the grid-connected inductance. It also establishes the mathematical model of the DC energy storage device, derives the control model, and implements power control based on the control diagram. The feasibility and accuracy of the cascaded half-bridge topology in DC direct-mounted energy storage devices are corroborated through simulation and prototype experiments. The experiments demonstrate the effectiveness of the design and control methods, offering valuable insights for the design of high-voltage and large-capacity DC energy storage devices.

Key words: DC direct-mounted energy storage, cascade half bridge, grid connected inductance, carrier phase shift modulation, power control

CLC Number:

TM 73

Wujie CHAO, Chaoping DENG, Junwei HUANG, Xin QIAO, Caoxuan CAI, Rundong XU, Zhibin LING. Design of DC direct-mounted energy storage device with cascaded half-bridge topology[J]. Energy Storage Science and Technology, 2024, 13(5): 1516-1522.

Figures/Tables 10

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参数	取值
直流电网电压U_DC	750 V
直流侧额定功率	7500 W
子模块电压U_B	51.2 V
子模块数量N	20个
并网电感L_S	8 mH
开关频率	1000 Hz
直流电压基准值V_DCB	750 V
直流电流基准值I_DCB	10 A
直流控制器P参数K_pdc	0.3
直流控制器I参数K_idc	93.4