Electricity-hydrogen isolated island direct current micro-grid operation control method

Abstract

The invention relates to an electricity-hydrogen isolated island direct current micro-grid operation control method. The method comprises the following steps of: 1, determining a switching condition between an operation mode of a system and different operation modes according to a difference between a wind-solar power generation system and a hydrogen production demand, a charge state of a lithium battery and a hydrogen state of a hydrogen storage tank; 2, determining interface device control strategies corresponding to a wind turbine generator, a photovoltaic power generation system, a lithium battery energy storage system and a hydrogen production unit in different operation modes; and step 3, determining interaction information of upper-layer power management and local equipment. According to the method, the power of the distributed power generation unit and the hydrogen production unit can be scheduled in real time according to the operation state of each unit of the system through a power management algorithm, and stable operation of the system is realized. The hydrogen production unit and the renewable energy are combined, so that the hydrogen production cost can be reduced, and the utilization rate of the renewable energy can be increased.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an operation control method for an electric-hydrogen island DC microgrid. Background technique [0002] Energy crisis and environmental pollution are important factors restricting the rapid economic development of countries all over the world. Optimizing energy allocation, increasing the proportion of clean energy power generation, and achieving clean, low-carbon sustainable development are the main development trends in the future power energy field. The rapid development and utilization of wind and light renewable energy is the main measure to solve the above problems. In recent years, wind and photovoltaic power generation systems have developed rapidly. With the continuous increase of installed capacity, how to efficiently absorb large-scale renewable energy has become a key technical issue. [0003] Driven by factors such as reducing carbon emissions, energy securi...

AI Technical Summary

Problems solved by technology

Due to the uncertainty and intermittent characteristics of the output power of wind and photovoltaic power generation systems, it is impossible to match the power requirements of the grid or loads in real time. Therefore, it is necessary to configure an energy storage system to absorb or compensate the unbalanced power between renewable energy and loads.

At present, the most commonly used energy storage unit is lithium battery. Although lithium battery has fast dynamic response capability, it belongs to short-term energy storage, and its cost is high, so it cannot absorb unbalanced power for a long time.

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