Coordinated Control Method for New Energy Direct Current Grid Connected Inverters Based on Sliding Window DFT Algorithm
At present,the coordinated control structure of grid-connected inverter is generally set in an independent form,and the overall coordinated control efficiency is low,which leads to the increase of the distortion rate of periodic inverter.Therefore,a coordinated control method of new energy direct current grid-connected inverter based on the Discrete Fourier Transform(DFT)algorithm is proposed.According to the existing measurement requirements and standards,the distortion current is measured first,and the overall coordinated control efficiency is improved by multi-objective method.Design a multi-objective cross-coordinated control structure,build a coordinated control model of grid-connected inverter with sliding window DFT,and realize coordinated control of inverter with three-phase balance control.The test results show that,compared with the traditional coordinated control method of inverter assisted by LC filter with output and the traditional coordinated control method of photovoltaic inverter,the distortion rate of periodic inverter finally obtained by the coordinated control method of inverter based on sliding window DFT algorithm is controlled below 0.2%,which greatly improves the coordinated control efficiency of variable grid inverter,enhances the control pertinence,and has good practical application value.
sliding window Discrete Fourier Transform(DFT)algorithmnew energydirect current grid connectioninvertercoordinated control
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