LCL filter parameter and control parameter global optimal design method and system based on particle swarm algorithm and medium

Abstract

The invention discloses an LCL filter parameter and control parameter global optimal design method and system based on a particle swarm algorithm and a medium. The method comprises the following steps: determining an LCL filter control system model, optimization objectives and constraint conditions; initializing value boundary ranges or values of parameters; determining a fitness function; and optimally designing filter parameters and control parameters of the LCL filter control system model by using a particle swarm algorithm according to the fitness function. According to the invention, filter parameters and control parameters are subjected to global optimal design, harmonic components can be filtered to make the grid-connection current close to a standard sine wave, the harmonic suppression effect is good, and the overall system performance requirement of the LCL filter inverter system can be well met. The method can adapt to a situation in which there are many parameters needing tobe designed and constraint conditions need to be considered and most of objective functions and constraint conditions are nonlinear. The convergence rate is high during parameter optimization, and the optimization result is good. The method is very suitable for engineering application.

Description

technical field [0001] The present invention relates to the active damping optimization design technology for grid-connected inverters in the field of power electronic conversion, in particular to a global optimization design method, system and medium for LCL filter parameters and control parameters based on particle swarm optimization, which can be used for photovoltaic parallel Grid-connected design of distributed energy such as grid-connected wind power and grid-connected wind power. Background technique [0002] The grid-connected inverter is the key equipment connecting the power generation system and the grid, and plays an important role in the field of distributed power generation such as photovoltaic grid-connected. Due to the use of high-frequency PWM modulation technology, grid-connected inverters will inject high-frequency harmonic currents into the grid and affect power quality. Therefore, the design of the grid-connected inverter AC measurement output filter ha...

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Problems solved by technology

However, since the LCL filter and the controller jointly determine the filtering performance and stability of the inverter system, it is difficult to design the parameters of the system separately to satisfy the global optimal

Moreover, during design, many constraints involve two types of parameters at the same time, and separate design cannot comprehensively consider the interaction between different constraints

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