Energy storage battery performance evaluation method of photovoltaic power generation system

Abstract

The invention provides an energy storage battery performance evaluation method of a photovoltaic power generation system. The energy storage battery performance evaluation method comprises the following steps that evaluation parameters of an energy storage battery of the photovoltaic power generation system are acquired; an evaluation model load state model of the energy storage battery of the photovoltaic power generation system and a cyclic time model of the energy storage battery are established, and performance indexes of the energy storage battery are evaluated according to the acquired evaluation parameters. By adopting the method, the performance state of the energy storage battery can be comprehensively evaluated under the situation of electronic converter influence of the photovoltaic power generation system, the accuracy of performance state evaluation of the energy storage battery is ensured, and accordingly stable work and grid-connecting stability of the photovoltaic power generation system are promoted.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method for evaluating the performance of an energy storage battery of a photovoltaic power generation system. Background technique [0002] With the depletion of fossil energy and the serious impact of fossil energy on the environment, people urgently need environmentally friendly renewable energy. At present, the existing renewable clean energy includes water energy, wind energy and solar energy. Since solar energy is cleaner during use, The distribution is also wider, therefore, solar power generation is receiving more and more attention. [0003] The conversion of solar energy into electrical energy is generally converted by photovoltaic cells (also known as photovoltaic cell arrays), and then incorporated into the grid through electronic converters (rectifying and inverting the electric energy output by photovoltaic cells). However, photovoltaic power generation is affected by...

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Problems solved by technology

[0003] The conversion of solar energy into electrical energy is generally converted by photovoltaic cells (also known as photovoltaic cell arrays), and then incorporated into the grid through electronic converters (rectifying and inverting the electric energy output by photovoltaic cells). However, photovoltaic power generation is affected by the environment, light The impact of intensity is severe. For example, during the process of photovoltaic power generation, dark clouds floating in the sky will have a great impact on photovoltaic power generation. The power increases sharply. At this time, the supplementary electric energy from the main grid and the electric energy of the photovoltaic battery are superimposed, causing the distribution network to be too late to absorb it, which may easily cause grid congestion or even reverse the flow. Therefore, it is necessary to add an energy storage device to the photovoltaic battery for deployment. When the power of photovoltaic power generation is insufficient, the output power of the energy storage battery is supplemented. When the power of photovoltaic power generation exceeds the consumption level of the grid, the energy storage battery absorbs energy to ensure that the photovoltaic power generation system outputs stable electric energy to the grid. Therefore, the energy storage battery is an extremely important device in the photovoltaic power generation system, and the performance of the energy storage battery will seriously affect the stability of the photovoltaic power generation system. In the prior art, the performance evaluation of the energy storage battery is only for the energy storage battery The evaluation of the load state SOC and health status is only for the energy storage battery itself. However, in the photovoltaic system, the performance evaluation of the energy storage battery is not only its own state, but also the electronic conversion in the photovoltaic system. The impact of the device on the energy storage battery and the impact of the energy storage battery's own state, but there is currently no way to achieve the above goals

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