Modular multilevel converter secondary circulation quantitative calculation method in energy storage battery

Abstract

The invention discloses a modular multilevel converter secondary circulation quantitative calculation method in an energy storage battery, which belongs to the technical filed of multilevel power electronic converters. According to the method, from the perspective of capacitor volt-ampere characteristics and equivalent switching functions, the energy balance control link of a bridge arm is simplified to a double-proportional regulator; a secondary circulation calculation model is deduced; output power, bridge arm energy balance control link parameters are comprehensively considered; a simulation annealing method based on least squares method optimization is used to solve an optimal parameter; and a secondary circulation correction model is established. The model can accurately calculate the amplitude of secondary circulation, and provides a theoretical basis for the selection of bridge arm power devices and secondary circulation suppression.

Description

technical field [0001] The invention relates to a quantitative calculation method for secondary circulation of a modular multilevel converter in an energy storage battery, belonging to the technical field of power electronics. Background technique [0002] The pressure from energy and the environment has led to more and more applications of renewable energy power generation. Renewable energy power generation has the characteristics of intermittent and randomness. Studies have shown that intermittent power sources such as grid-connected renewable energy have impacts and impacts on grid security, stability, and power quality. Therefore, many countries have formulated strict grid-connected standards for intermittent power supplies. Through the self-regulation of intermittent power supplies, parameters such as grid-connected power fluctuations can meet grid-connected standards. However, while limiting the grid-connected impact of the intermittent power supply, it also reduces t...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a quantitative calculation method for the secondary circulation of a modular multilevel converter in an energy storage battery. From the perspective of capacitance volt-ampere characteristics and equivalent switching functions, the After the bridge arm energy balance control link is simplified into a dual proportional regulator, the derived secondary circulation calculation model solves the technical problem of low secondary circulation calculation accuracy in the prior art

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