In order to realize the safe and stable operation of the 100% renewable energy integrated energy system, reasonable capacity allocation is very important. Firstly, considering the utilization characteristics of hydrogen energy, an integrated energy system with multi-energy coupling of electricity, heat and hydrogen was constructed. Secondly, aiming at the lowest operating cost and minimum pollutant emission, a capacity optimal allocation model of a integrated energy system with 100% renewable energy was established, and the Pareto frontier was constructed by the compromise planning and fuzzy method to solve the multi-objective problem. Finally, based on the characteristic curves of typical diurnal output and electric, thermal and hydrogen loads in three different seasons, the validity of the model is verified by simulation examples, and the application of hydrogen energy can bring obvious economic benefits to the integrated energy system.

The wind-solar-hydrogen hybrid energy system is an important and effective solution to effectively solve the shortcomings of strong randomness and large fluctuations of wind power and photovoltaic power generation, and improve the reliability of power supply of the system, which is also an important development direction of the future power generation system. However, the system has a complicated topology structure, many types of equipment, complex characteristics, and diverse control models, which poses great challenges to system structure design and energy management strategy formulation. This article summarized and analyzed in detail from three aspects: system components, design ideas and energy management strategies. The system grid connection status, bus structure and specific components were introduced, the optimal design ideas, methods and evaluation indicators of the system were summarized, and the system energy management strategies with different expected goals were compared. Finally, the development direction of the future wind-solar-hydrogen hybrid energy system control system was proposed, which provides references for the research, development and application development of wind-solar-hydrogen hybrid energy system in China.

In order to solve the excessive carbon emissions caused by the massive use of fossil energy and the problem of power consumption caused by the large-scale development of wind power, the use of wind power coupled with seawater hydrogen production is an ideal way to realize the transformation from traditional fossil energy to green energy. At the same time, this method can not only promote the consumption of new energy power, but also alleviate the problem of fresh water allocation. According to the calculation results of theoretical energy consumption and the analysis of the cost of seawater desalination technology, compared with direct seawater splitting, which is still in the research stage, seawater electrolysis after desalination is more economical and reliable. From the perspective of sustainable development, wind power coupled with seawater electrolysis after desalination is an important strategic means to achieve emission peak and carbon neutrality as soon as possible.

Hydrogen energy is an important renewable carbon-free energy, which regarded as the most ultimate energy carrier in the 21st century. Hydrogen energy storage can effectively solve the accommodation of renewable energy and stabilize the peak-valley of power grid. China is the largest energy consumer and CO₂ emitter in the world. The application scenario of hydrogen energy storage for the model of zero carbon emission was proposed based on the carbon peaking & carbon neutralization. Through three links of hydrogen production, storage & transportation, and terminal application, the development trend of hydrogen energy storage application scenario was prospected combined with energy conversion efficiency, hydrogen production cost, hydrogen energy storage technology, hydrogen transportation, profit model and ecological impact. It is founded that there are still many technical weaknesses in energy storage application, and there are still many problems to be solved in each link. Looking forward to the future, it is suggested to improve the energy conversion efficiency of hydrogen energy storage technology with technological innovation, and promote the large-scale commercial application with cost parity.

In September 2020, General Secretary Xi Jinping stated at the 75th United Nations General Assembly: China's CO₂ emissions will strive to reach their peak by 2030 and achieve carbon neutrality by 2060.After the targets of carbon peak and carbon neutrality was determined, Ningxia Hui Autonomous Region actively responded to national policies and vigorously promoted the use of clean energy. However, with the large-scale integration of clean energy into the grid, Ningxia power grid is facing many problems such as difficulty in digestion of new energy and poor power quality. The popularization and application of energy storage technology has brought new directions to the solution of the above problems. The paper first introduced the current status of energy storage development at home and abroad, expounded the current installed capacity of energy in Ningxia power grid, analyzed the problems of Ningxia power grid, and then based on the current situation of Ningxia power grid, the inevitable demand for electrochemical energy storage was determined. Finally, the configuration method of electrochemical energy storage capacity was discussed, which provides a reference for the configuration of energy storage capacity in Ningxia power grid.

Under the targets of carbon peak and carbon neutrality, how to achieve deep decarbonization and accelerate energy transition has become the primary issue facing China. Since hydrogen energy is a secondary clean energy with high energy density and pollution-free, its application will occupy an important position in the future economic and technological development. Therefore, accelerating the layout of the hydrogen energy industry is an effective way to solve my country's primary problems. This article starts with renewable energy and nuclear hydrogen production technology, studies the technical principles and development status of green hydrogen production, and analyzes and summarizes the application approaches of green hydrogen production at home and abroad. With the progress of my country's green hydrogen application technology, green hydrogen, as a green and efficient energy application scenario, continues to emerge, and has a broad application space in the fields of electric power and chemical engineering. Finally, three suggestions are made for the development and business model of my country's green hydrogen industry.

With the introduction of the goal of carbon neutral and carbon peak, energy storage technology has been developed rapidly, among which lithium-ion batteries have been widely used due to their high safety performance and long life. In this paper, the Thevenin equivalent circuit model was selected to model the lithium-ion battery, and a Simulink simulation model was built, and then the extended Kalman filter algorithm was used to estimate the state of charge (SOC) of the battery. The simulation experiment results also verify the selection the Thevenin model has high accuracy. Finally, this paper sorted out the problems in battery modeling, and looked forward to the establishment of a high-precision, high-applicability lithium-ion battery simulation model and future development directions.

Energy storage power station was needed in multi-energy complementary system with a high proportion of new energy generation for adoption of new energy power electricity. Taking an actual power grid as the example, the 8 760 h production simulation based on mathematical optimization was used to calculate the 8 760 h operating status of multi-energy complementary system, and a cost-benefit model of energy storage power was established to calculate capacity efficiency, power efficiency and energy storage duration of the energy storage station.On this basis, the reasonable scale of energy storage power station was analyzed comprehensively considering the constraints of new energy curtailment rate, power supply reliability.The research results can provide references for energy storage requirements and optimization of multi-energy complementary systems

A comprehensive simulation software for hydrogen production system based on renewable energy generation is designed and developed, which integrates electrical stability analysis and economic feasibility analysis. The software functions are designed from the perspectives of fast modeling, multi-dimensional simulation, parallel speed-up, etc., aiming to provide researchers with a fast, comprehensive and low threshold simulation tool for renewable energy-based hydrogen production system. The software architecture is designed based on MVC pattern, which is developed in model layer, view layer and control layer respectively. The general interface framework is designed, and the application interface is developed with PSCAD as an example. Based on the idea of model reuse, the electrical model library is developed to reduce the cost of user modeling. Based on the cost-benefit analysis, the whole life cycle economic model is built. The graphical operation interface is developed based on PyQt5. In addition, a multi parameter parallel method is introduced to improve the simulation speed. The simulation results show that the software can effectively simulate the system characteristics and significantly reduce the modeling time and simulation running time compared with the traditional simulation methods; Economic simulation results effectively evaluate the system economy and provide strong support for capacity allocation optimization.