Aiming at the problem that the energy storage power conversion system(PCS)of railway traction station has poor quality of grid-connected current in a grid rich in background harmonics,a method for the orthogonal compo-nents construction of multiple second-order generalized integrators(MSOGI-QSG)is proposed,the orthogonal compo-nents of the fundamental and harmonic currents on grid side are constructed.The fundamental and harmonic current control loop is constructed using proportional integral(PI)controllers in the d,q coordinate system to achieve accura-te tracking and suppression of the fundamental and harmonic currents on grid side.Firstly,the working principle of the proposed MSOGI-QSG is introduced.Secondly,the design method of the PI controller parameters of each current control loop is analyzed in a static coordinate system.Finally,a 5 kW single-phase PCS hardware platform is built for experimental verification,and the correctness of the proposed control strategy is proved by experimental results.
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