Power-to-gas multi-source energy storage type microgrid day-ahead optimal economic dispatching method

Abstract

The invention discloses a power-to-gas (P2G) multi-source energy storage type microgrid day-ahead optimal economic dispatching method. The method comprises the steps of building a P2G multi-source energy storage type microgrid model by performing modeling on a P2G multi-source energy storage type microgrid by adopting an energy concentrator method, establishing a supply side matrix expression, a conversion component matrix expression and a load side matrix expression, simultaneously establishing a supply side matrix, a conversion component matrix and a load side matrix, and obtaining a matrix expression of an energy relationship of the P2G multi-source energy storage type microgrid; and establishing a day-ahead P2G multi-source energy storage type microgrid economic dispatching model, which comprises target functions, component models and constraints. According to the method, a second microgrid is added to a power storage and heat storage device on the basis of a first microgrid, so that the wind curtailment amount is slightly reduced, the system cost is also reduced, and the advantages of multi-source energy storage are reflected; and a third microgrid is added to a P2G device, so that the wind curtailment amount is greatly reduced, the utilization rate of a fan is increased to a great extent, and the unique advantages of the P2G multi-source energy storage in the aspect of wind energy absorption are proved.

Description

technical field [0001] The invention relates to a microgrid day-ahead economic scheduling method. In particular, it involves a day-ahead optimal economic scheduling method for a power-to-gas multi-source energy storage microgrid. Background technique [0002] As the use of new energy is widely valued by people, the installed capacity of new energy power generation systems such as photovoltaics and wind power is increasing. It is estimated that the installed capacity of wind turbines will reach 200 million kilowatts by 2020. However, due to the asynchronous construction of wind farms and power grids, and the mismatch between wind power characteristics and peak-shaving capabilities of the power grid, wind and light abandonment have occurred in some areas, resulting in energy waste and economic losses. [0003] Adopting an integrated energy system architecture to integrate renewable energy is one of the important means to improve the utilization rate of renewable energy. The ...

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Problems solved by technology

Compared with the process of electricity-to-natural gas, electricity-to-hydrogen can avoid the energy loss of methanation reaction, but this method also has many disadvantages, for example: (1) After hydrogen is added to the existing natural gas pipeline, it will cause risks in pipe materials, such as hydrogen crisp and penetrating

Therefore, some countries restrict the proportion of hydrogen injected into natural pipelines. For example, Germany stipulates that the content of hydrogen in natural gas pipelines cannot exceed 5%; (2) The energy density of hydrogen is about 1 / 4 times that of methane, and the volume of natural gas with the same energy Much larger than methane, not easy to store and transport

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