On the afternoon of April 1, the fourth national energy storage industry tour group organized by the Energy Storage Applications Branch of the China Chemical and Physical Power Industry Association entered Shangneng Electric Co., Ltd. (hereinafter referred to as 'Shangneng Electric'). Wu Qiang, Chairman of the Electrical Engineering Department, Zhao Long, Chief Engineer, Wu Yaping, General Manager of the Wuxi Research and Development Department, and Wen Xiaofei, General Manager of the Supply Chain received the research team. The two sides discussed the development trend of photovoltaic and energy storage, the layout of the Shangergy Electrical Industry, research and development advantages, and The energy storage market and other areas began a detailed exchange.
Wu Qiang introduced that Shangneng Electric has integrated a photovoltaic business of one of the world's top 500 companies, undertook the first-class power electronics technology platform and accumulated experience in a hundred years of foreign-funded enterprises, and achieved full integration with the world's advanced level in the areas of research and development, management, and marketing. It has established the Enterprise Technology Center, Jiangsu's only Energy Photovoltaic Inverter System Engineering Technology Research Center and Enterprise Academician Workstation, and has successfully applied for the Jiangsu Provincial Science and Technology Achievement Transformation Project, and has won the Jiangsu Provincial Strategic Emerging Industry Special Funding Support.
Innovation leads the industry
Shangneng Electric Chief Engineer Zhao Long
According to Zhao Long, Shangneng Electric owns complete photovoltaic power generation products and 3kW~5MW photovoltaic power generation solutions. It has a full range of distributed, centralized, and string-type photovoltaic inverter products, and has successfully participated in many major photovoltaic projects. The area involves desert, plateau, high temperature, alpine, coastal and other harsh environments.
Shangneng Electrical Energy Storage Converter products include 50kW~500kW modular AC energy storage PCS, 125kW~500kW cabinet AC energy storage PCS, 125/250kW DC storage tank PCS and 500~2000kWh optical storage container, etc. Typical application examples are: COPT PLANET 250kWh Latent Battery Energy Storage Demonstration System, Hebig Vacuum Electronics (Dongguan) Co., Ltd. 150kWh Distributed Energy Storage, Yangzhou Hisense 1200kWh/375kW Distributed Energy Storage System, Huaneng Geermu Phase IV DC photovoltaic energy storage system.
Zhao Long stated that with the rapid development of the new energy industry, phenomena such as abandoning the light and limiting power in the northwest, northeast, and north China have occurred. This not only causes a waste of electrical energy, but also reduces the power generation revenue of users, and also restricts the entire photovoltaic new energy source. The healthy development of the industry. In addition, photovoltaic power generation has unpredictable power fluctuations and output, and it is difficult to effectively schedule the problem. This has led to an increasingly irreplaceable impact on the safe and stable operation of the entire power grid.
The application of energy storage technology in photovoltaic power plants can not only effectively solve the problem of abandoning light, promote the consumption of renewable energy, but also achieve smooth power fluctuations in renewable energy sources, peaking Pinggu, and frequency modulation and pressure adjustment to satisfy large-scale access to renewable energy. The important means of the power grid is also an important part of the distributed power system and smart grid system.
Serve the large energy storage market with DC-side solutions
According to the latest report issued by the National Renewable Energy Laboratory in 2018, by 2020, as the penetration rate of solar photovoltaics in the power grid continues to increase, the benefits of photovoltaic + energy storage will become more and more obvious. Among them, the PV DC side access storage The most obvious advantages of the program can be.
Zhao Long stated that the traditional AC access centralized energy storage system is facing certain limitations in photovoltaic energy storage applications: First, photovoltaic components are first reversed to boost power to the grid, and then stepped down from the grid to charge rectifiers. Second, the EMS system needs to schedule the inverter and PCS output in real time on the basis of the AGC/AVC system to ensure that the vector and the two meet the grid requirements. The cost is high, the risk is high, and the system is more complex; third, the large-scale power plant AC UPS may face low voltage traversal and other related certification requirements.
In energy storage systems that are tightly integrated with photovoltaics, peaks and valleys are filled, smooth output curves are generated, and power generation plans are tracked. Secondary frequency regulation is its most important functional indicator. Therefore, higher-efficiency, lower-cost DC-side access is used. The distributed energy storage scheme has greater advantages; for other energy storage applications that are relatively weak in combination with photovoltaics, it is recommended to adopt a traditional AC-side access energy storage scheme.
The distributed photovoltaic energy storage system accessed by Shangneng Electric DC side has the following features: First, less new equipment is added, and the original photovoltaic inverter equipment is fully utilized to realize energy storage and power generation; secondly, the energy storage system can directly use the original Photovoltaic devices generate electricity on the grid side, reduce equipment investment, reduce system no-load loss, and facilitate post-maintenance maintenance of the power station; thirdly, use DC energy storage systems to peak-fill valleys for power generation of components, increase the ratio of capacity of power plants, and reduce inverters. And box change power and investment to reduce the cost of electricity. Fourth, through the charge and discharge strategy design of DC energy storage system, the inverter can avoid the low efficiency range in the early morning and late low-light conditions, and further improve the system efficiency; The DC-side access distributed energy storage solution is also a highly flexible building block energy storage system. It is quick and easy to install to ensure the safety of the flammable assets of the power station. Its DC/DC converter can separately charge and discharge each group of batteries. Easy step-by-step investment in step-by-step construction.
In the application case, Zhao Long introduced the demonstration project for the development and application of energy storage technology on the DC side of the photovoltaic power station of the Huaneng Clean Energy Research Institute. The project was completed and successfully operated in October 2017. The energy storage system is connected to the existing stock ground. Photovoltaic power station. Using Zhongtian lithium iron phosphate battery, Shangneng Electric provides DC bi-directional PCS system and builds DC side energy storage system to access third-party branded photovoltaic inverter. This project has an upgrade for energy storage system of existing power station. Significant demonstration significance. At present, the second phase of the project, 50MWh, has also been determined to adopt a DC-side access to a distributed energy storage scheme.
In the company's industrial park, it has been able to cooperate with Panasonic and Yiwei Lithium to establish a distributed photovoltaic energy storage system experimental platform. This platform is provided by Panasonic ternary lithium battery and Lithium iron phosphate lithium iron phosphate battery, Shangneng Electric The provided DC bidirectional PCS system is virtually connected in parallel, which verifies the flexible battery compatibility of the DC-to-DC distributed energy storage system and also verifies the excellent performance of the distributed PV energy storage system.
According to reports, Shangneng Electric also has power quality product solutions in addition to photovoltaic and energy storage-related product solutions. These include 50A/100A active power filter modules, active reactive power compensation modules, and three-phase unbalance compensation modules. And other series products, provide customers with complete power quality solutions.
Currently, Shangneng Electric has established a modern and advanced industrial park with complete power production capacity for electronic products and an annual capacity leader in photovoltaic inverters. In the future, Shangneng will continue to uphold its 'market-oriented and customer-centric' approach. The purpose of the operation is to continue to increase R&D investment, actively participate in international competition, and strive to build the company into a world-class power company.
Liu Yong stated that the distributed energy storage users are very dispersed. Shangye Electric has continuously optimized the overall solutions for power electronics, air conditioning systems, fire-fighting facilities, temperature control systems and battery modules, and has conducted full technical verification work for large-scale energy storage applications. .
Lu Gang, director of the Institute of Energy Strategy and Planning of the State Grid Energy Research Institute, stated that the current configuration of energy storage in photovoltaics is at a critical point. In the future, the battery life will be further extended, the battery price will be further reduced, and photovoltaic energy storage will usher in a vast space. , Hope that Shangneng Electric can combine its own advantages to make a good industrial layout.
The expert group stated that it hopes that Shangneng Electric will continue to explore the business model that can be replicated under the new era while it is doing a series of product solutions.
Participated in this study were Deputy Secretary-General of the Energy Storage Applications Branch of the China Chemical and Physical Power Industry Association, and Chen Yongfu, Head of the Energy Storage Research Group of the Institute of Electrical Engineering of the Chinese Academy of Sciences; Xu Zhicheng, Senior Researcher, Institute of Energy Strategy and Planning, State Grid Energy Research Institute, China Electric Power Science Research Institute Power Distribution Institute Xu Yihu, Director of the Intelligent Department of Southwest Electric Power Design Institute Co., Ltd., China Power Engineering Consulting Group Li Jiayi, Secretary of Development Department of Nanjing Nanrui Jibao Electric Co., Ltd. Zhang Liyang, China Association for Storage and Energy Application of China Chemical and Physical Power Supply Industry Association Secretary-General Liu Yong, Cui Yingying, Strategic Marketing Department, Shanghai Electric Power Generation Group, Zhou Jie, Planning and Evaluation Center, State Grid Yubei Electric Power Co., Ltd., Senior Engineer of State Grid Qinhuangdao Power Supply Company, Senior Engineer, China Industrial Development Group Manager Liu Yi, Jiang Xinyu, Vice Chairman of Guangzhou Zhiguang Energy Storage Technology Co., Ltd., Chu Pan, Chief Engineer of Design, Guangdong Electric Power Design and Research Institute, Niu Wentao, Tianchen New Energy Company, Yu Xiaolong, Shenzhen Yongquan Energy Storage Technology Co., Ltd., China can build Jiangsu Electric Power Design Institute distribution network network letter engineering company Bo Rong Xiang Branch Secretariat and energy storage applications.
This period of research was strongly supported by Shanghai Electric Power Generation Group, Guangzhou Zhiguang Electric Co., Ltd., and China Fortune Happy Foundation Co., Ltd.