The new power system is an important carrier of the new energy system, with five major characteristics: clean and low-carbon, safe and controllable, flexible and efficient, intelligent and friendly, and open interaction. Energy storage system technology plays an indispensable role in the construction of new power systems, serving as an important engine for achieving the five major characteristics, as well as a fundamental pillar for ensuring the continuous and reliable supply of electricity, ensuring the safe and stable operation of the power grid, and promoting the efficient consumption of new energy (referred to as “two guarantees and one promotion”).
The new power system has officially entered the critical stage of “path design” and “methodology implementation”. On the same day, China Electric Power Daily published a signed article by Chairman Xin Baoan of State Grid Corporation of China, titled “Research on Methodology for Building a New Power System”, explaining the key difficulties in building a new power system. It can be affirmed that energy storage system technology will continue to play an important role in different stages of the construction of the new power system. It is necessary to improve the theoretical methods of energy storage systems based on top-level design, promote digital and intelligent technology innovation of energy storage systems, and provide good services to support the widespread access of high proportion renewable energy on the power supply side, safe, efficient, and flexible allocation of resources on the power grid side The strategic goal of diversified load demand on the load side.
Based on the above background, “Power Supply and Consumption” invited us to jointly plan the topic of “Energy Storage System Technology in New Power Systems” and organized 5 technical papers. On the basis of analyzing the current development status of electrochemical energy storage system technology in China, Li Xiangjun and others from China Electric Power Research Institute Co., Ltd. proposed new ideas and methods for the digital and intelligent application of energy storage batteries, energy storage converters, and energy storage power stations, and looked forward to the prospects of digital and intelligent application of electrochemical energy storage system power stations; In response to the increasingly complex black start problem of microgrids, Liu Jiahao and others from Beijing University of Information Technology have comprehensively considered the impact of the state of charge of energy storage systems and the uncertainty of distributed power generation output, and proposed a dynamic black start strategy for microgrids based on online evaluation of distributed power generation black start capability. This strategy can avoid black start failure caused by actual power output being less than load demand, It can also reduce energy waste caused by actual excess power output of the power supply; In response to the safety risks and optimization operation issues of lithium-ion batteries in battery energy storage system power stations, Li Yining and others from China Electric Power Research Institute Co., Ltd. proposed an energy management strategy for battery energy storage power stations that takes into account the state of charge, health status, and safety status of battery energy storage units. This strategy ensures the safe operation of the energy storage system and has a good balance of state of charge effect, And battery energy storage system power stations can better participate in power system scheduling; In response to the issue of improving the output characteristics of wind power generation, Chen Jinyu and others from the Electric Power Science Research Institute of State Grid Fujian Electric Power Co., Ltd. proposed a robust model predictive control technology for wind storage systems aimed at power suppression. Compared with other technologies, the proposed robust model predictive control strategy has better suppression effect on wind power fluctuations and stronger adaptability to different levels of wind power prediction errors; In response to the issue of voltage sag prevention and control, Liu Manjia and others from the Electric Power Science Research Institute of State Grid Hubei Electric Power Co., Ltd. proposed a voltage sag hierarchical governance strategy based on grid structured energy storage converters. This strategy can effectively support the voltage of grid connection points and ensure the stable operation of important sensitive loads in industrial parks.
In summary, this topic focuses on topics such as digital and intelligent application of energy storage, modeling and simulation, operation control, and black start. It is planned to grasp the functional positioning and development trend of energy storage systems through theoretical research, method promotion, and industrial collaboration, and provide certain application ideas for energy storage to participate in supporting the “two guarantees and one promotion” of new power systems. Looking forward to the future, in order to promote the healthy and orderly development of energy storage system technology, not only can we deeply grasp the construction logic of new power systems, but also conduct methodological research on the development of energy storage systems; We should also deepen the implementation and practice of new power systems by promoting technological innovation in energy storage systems. It is recommended to continue to pay attention to the planning and evaluation of energy storage systems, integrated operation, and development of new equipment technology in the new power system, and make new breakthroughs in areas such as multi energy complementary systems, ultra large scale energy storage power plants, joint application of multiple types of energy storage, and collaborative optimization of source network load storage.