Research on PI Decoupling Control Technique for Active Power Filter Compensation
Distortion of voltage and current waveforms in the power grid generates harmonics,which leads to a reduction in the power factor of the power grid and affects the stability and reliability of the power system.To ensure the normal operation of the power system,the proportional integral(PI)decoupling control technique based on active power filter compensation is investigated.A diode-clamped based active power filter model is designed.The Kirchhoffer voltage method is combined to reduce control harmonics and decouple some variables.For the harmonics generated by equipment nonlinearity,the reversibility of the active power filter is analyzed to obtain the input Jacobi matrix to linearize the filter rotation coordinates.The transformation matrix is utilized to convert the rotation angle velocity vector,the amplitude of the input harmonics,and the output current sampling delay to complete the non-differential PI decoupling control.The experimental results show that the proposed technique can effectively decouple the harmonic currents of the filter,compensate for the distortion currents in the power grid.The technique can reduce the overall impact of harmonics on the power system,and ensure the normal operation of the equipment.
Active power filterHarmonic compensationProportional integral(PI)decoupling controlJacobi matrixCurrent transformerOpen-loop transfer functionKirchhoffer voltage method
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