Energy storage system charging and discharging control method for smoothing photovoltaic power fluctuation

Abstract

The invention discloses an energy storage system charging and discharging control method for smoothing photovoltaic power fluctuation, and the method comprises the following steps: S1, obtaining userload data and photovoltaic output data in a power distribution network, and configuring a hybrid energy storage system according to the collected data; S2, giving a transformer capacity reduction value [delta], setting an initial value k0 of a waveform forming coefficient, and calculating the maximum charging and discharging power value and the minimum energy value of the energy storage device according to an energy storage parameter calculation method; S3, obtaining a daily net load value by subtracting the value of the adjusting photovoltaic output curve from a daily load curve; S4, obtaining the maximum charging and discharging power value and the minimum energy value of the energy storage device according to the configuration method of the energy storage device; and S5, finding the optimal cost allocation when the transformer capacity is reduced by [delta] by analyzing the change of the k0 waveform coefficient. According to the technical scheme, fluctuation of photovoltaic output can be stabilized, the user load peak-valley difference is reduced, and the energy storage cost is well optimized.

Description

technical field [0001] The invention relates to the control field of electric energy storage systems, and specifically relates to a charging and discharging control method of an energy storage system for smoothing fluctuations in photovoltaic power. Background technique [0002] With the development of technology, the distribution network adopts renewable energy on a large scale, such as wind energy and solar energy. On the one hand, renewable energy is very important for the restructuring of the energy industry and air pollution control; on the other hand, the randomness and suddenness of the output power of renewable energy will affect the security and stability of the distribution network. In order to reduce the fluctuation of photovoltaic power, there have been many studies focusing on the design of photovoltaic grid-connected inverters. At the same time, with the increase of residential and industrial electricity consumption, the difference between peak and valley load...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of power system instability caused by the large-scale integration of renewable energy into the distribution network, and propose a charging and discharging control method for the energy storage system that smoothes photovoltaic power fluctuations. This technical solution can stabilize the fluctuation of photovoltaic output Fluctuation, reducing the peak-valley difference of user load, can optimize energy storage cost well, and has the advantages of improving energy storage performance and effectively prolonging the life of energy storage devices

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