Energy Storage Science and Technology ›› 2022, Vol. 11 ›› Issue (7): 2213-2221.doi: 10.19799/j.cnki.2095-4239.2022.0140

• Energy Storage System and Engineering • Previous Articles     Next Articles

Development of high-power Ni-MH battery system for primary frequency modulation

Tian WU1,2(), Mincheng LIN3, Hao HAI3, Haiyu SUN3, Zhaoyin WEN4, Fuyuan MA1,2()   

  1. 1.Zhejiang Energy R&D Institute Co. , Ltd.
    2.Key Laboratory of Solar Energy Utilization & Energy Saving Technology of Zhejiang Province, Hangzhou 311121, Zhejiang, China
    3.Ningxia Zaoquan Power Generation Co. , Ltd, Lingwu 750409, Ningxia, China
    4.Shanghai Institute of Ceramics, Chines Academy of Sciences, Shanghai 200050, China
  • Received:2022-03-16 Revised:2022-03-19 Online:2022-07-05 Published:2022-06-29
  • Contact: Fuyuan MA E-mail:wutian@zjenergy.com.cn;mafuyuan@zjenergy.com.cn

Abstract:

Large-scale grid integration of renewable energy reduces the level of inertia and anti-disturbance ability of power systems, weakens the frequency stability of the power grid, and increases the difficulty of primary frequency modulation (PFM) of the power grid. Facing the increasing pressure of frequency modulation, an energy storage system that responds to the PFM of the power grid is required. This paper introduces the principles of the nickel-metal hydride (Ni-MH) battery. Then, combined with operational condition data of 660 MW thermal power units participating in PFM in Northwest China, the optimal power/capacity configuration results and coordinated control strategy suitable for an Ni-MH battery energy storage system are proposed. In addition, high-power Ni-MH batteries, modules, and systems are developed for energy storage systems with a target capacity of 5 MW/0.5 MWh. The charge and discharge curves, cycle life, consistency, and PFM conditions of the batteries, modules, and systems were evaluated. Experimental data results demonstrate that the high-power Ni-MH batteries presented in this paper exhibit high charge and discharge rates of 10 C and 480,000 cycles under short-time and high-frequency working conditions. The modules and systems work stably under high-power test conditions. The results of this study verify the application potential of Ni-MH battery energy storage technology in the PFM of thermal power.

Key words: Ni-MH Battery, energy storage system, primary frequency modulation, state of charge

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