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The World First 10 kV Direct HV Energy Storage PCS Plant

Date: 2016-07-04
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The World First 10 kV Direct HV Energy Storage PCS Plant Appraised as an International Advanced Plant


Recently, a technical appraisal conference was hosted by the Chinese Society for Electrical Engineering ("CSEE") in Beijing regarding the development and application project of key technologies for the large-capacity energy storage stations with Li-ion batteries. It was one of the national #863 scientific and technological projects and undertaken by CSPG's Peak Load and Frequency Regulation Power Plant. Chen Shijie, academician of the Chinese Academy of Sciences and expert in the electric power system, attended the conference as director of the appraisal committee. It has been affirmed by the appraisal committee that: this project has overcome key technological difficulties in large-capacity battery energy storage stations. Its result represents a significant innovation in the field of large-capacity battery energy storage. It can provide technological support for the design, construction and operation of large-capacity battery energy storage stations. It also plays an important role in promoting the development of smart grids, scaled consumption of new energy, and energy structure optimization in China. It has a significant prospect in terms of economy, society and popularized applications. It is up to the international leading level with respect to energy conversion and battery balance control technology.
As the developer of the power conversion system (PCS) technology for this project, Zhiguang has initiated the PCS technology of the large-capacity 3-phase H-bridge cascaded energy storage system with direct transformer-free connection to the HV grid. Such PCS system is a fast and efficient power conversion system with the world's maximum power and output voltage. It has broken through technological difficulties in the large-sized multi-stage battery packs for the large-capacity battery energy storage system. It has also improved the consistency of the multi-stage battery series-parallel connection and the parallel operation efficiency of the energy storage system by over 2%.
From the approval of this PCS project until the equipment passed the final test and acceptance and was put into operation, it has taken ten months in total. Zhiguang set up a special research team as soon as it was granted such project. Without any ready-made product or existing technology, it has made the best use of its rich experience in high-power electric, electronic and related control technologies. By overcoming all difficulties with substantial assistance of the project-related entities, it has fulfilled relevant scientific research tasks successfully. All these have highlighted its development history of the high-power conversion technology and its R&D advantages. Accordingly, a good technological foundation has been laid for its further research and development of more control technologies for the Energy Internet.

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