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Excellent Cases in Chinese Smart Energy Sector

Date: 2015-10-21
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To implement relevant national policies, define the strategic development orientation, strengthen R&D of key technologies, promote pilot applications of various solutions, and establish advanced models regarding smart energy, the China Strategic Alliance of Smart Energy Industrial Technology Innovation held the "Internet of Energy Conference China and Smart Energy Industry Expo 2015" (SEC) in Hangzhou between October 16 and 18, 2015. Numerous domestic and foreign experts got together to discuss the development of the Chinese Internet of Energy and smart energy industry. The "Excellent Cases in Chinese Smart Energy Sector in 2015" were announced at this conference. The 10 kV cascaded PCS in the Baoqing Energy Storage Generation Plant of China Southern Power Grid Company Limited ("CSPG"), which was undertaken by Guangzhou Zhiguang Electric Co., Ltd. ("Zhiguang Electric", stock code 002169), was listed as a "Top 10 Excellent Case in the Chinese Smart Energy Sector in 2015". Mr. Jiang Xinyu, executive vice president of Zhiguang Electric, attended the awards ceremony.

Excellent Cases in Chinese Smart Energy Sector


Located in Longgang District of Shenzhen, the Shenzhen Baoqing Battery Energy Storage Station for 10 kV PCS of CSPG's Baoqing Energy Storage Generation Plant belongs to CSPG's Peak Load and Frequency Regulation Power Plant ("CSPG's Dual Regulation Plant"). It outputs 10 kV industrial power for the prefecture of the Biling Substation. With a design capacity of 10 MW, the Baoqing Energy Storage Generation Plant was constructed in three phases. Specifically, Phase I (4 MW) was put into operation in 2012; Phase II (2 MW) was debugged and put into parallel operation at the end of 2014. It was one of the National Pilot Projects #863.
By virtue of its years of experience in HV high-power electric and electronic technologies, Zhiguang Electric participated in the design, manufacturing, debugging and operation of such energy storage system. It also customized the 10 kV/2 MW ZG-PCS power conversion system, which was the core component of power control in such system. Featuring a cascaded topological structure, such ZG-PCS can be connected to a 10 kV grid directly without any booster transformer. As the first global power conversion system directly connected to a 10 kV grid, it led to the leapfrog development of battery energy conversion technology. Based on the unique energy equalization control scheme, such ZG-PCS makes the independent regulation of each power link possible and leads to the equalization control for battery energy storage among three phases and within a single phase in a creative way. As a result, the overall technological level of such energy storage system has been improved significantly. Furthermore, the ZG-PCS with perfect online monitoring and protection capacities also results in the real-time processing and uploading of key information in the PCS, thus ensuring stable system operation. Various benefits of such ZG-PCS have been highlighted in the performance of this project, such as high power conversion efficiency, good EMC, rapid response and system stability. From the perspective of its development and operation, it has been tested and authenticated by several authorities. Its technical indicators have met or been beyond the overall requirements for such large-capacity energy storage systems. This project has been granted multiple advanced proprietary technologies. Its overall performance indicators are up to the domestic first and global advanced levels. It has filled technological gaps in the PCS for the battery energy storage systems and fully improved the overall technological level of such systems.


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