An improved sparrow search algorithm to optimize the DC side control method of three-phase sapf

Abstract

The invention discloses an improved sparrow search algorithm to optimize the three-phase SAPF DC side control method, step 1, nonlinear load current I L After the reference current detection module, remove the current fundamental wave positive sequence active component i pabc After that, get the harmonic current i h ; Step 2, use the difference between the SAPF DC side voltage reference value and the actual voltage value to calculate the algorithm-optimized objective function ITAE; Step 3, use the ISSA algorithm for parameter tuning to find out K p 、K i The optimal value of is assigned to the PI controller, and the voltage deviation is converted into a compensation current increment Δi for stabilizing the DC side voltage p ; Step 4, put Δi p with i pabc multiplied with i h Do the difference to get the reference current i ref ; Step 5, reference current i ref Subtract the compensation current I c The difference, through PR control, output signal g; step 6, the output signal g controls the PWM converter to make SAPF output a reasonable compensation current I c . The invention adopts the ISSA algorithm to tune the control parameters, has higher optimization precision, faster convergence speed, and better DC side voltage stabilization effect.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an improved sparrow search algorithm to optimize a three-phase SAPF DC side control method. Background technique [0002] With the development of power electronics technology, a large number of nonlinear loads are put into use in the microgrid, which leads to more and more serious harmonic pollution of the grid current. Three-phase parallel active power filter (SAPF) can effectively compensate harmonics. In fact, SAPF is a double-closed-loop system composed of a current inner loop and a voltage outer loop. When the grid is connected to a nonlinear load, many harmonics and reactive currents are injected into it, and the harmonic content exceeding a certain standard will seriously threaten the safety and stable operation of electrical equipment. Therefore, in order to improve the compensated grid current waveform, suppress Harmonics, it is necessary to stabilize the volta...

AI Technical Summary

Problems solved by technology

The effect of tuning parameters of the neural network is greatly affected by the initial value; fuzzy control requires the tuner to have rich prior knowledge to write fuzzy rules; the cross-mutation operation in the genetic algorithm may make the better solution worse; Algorithm is the most classic method in swarm intelligence algorithm, but it has the defects of easy to fall into local optimal area and slow convergence

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