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As the current research focus of the reactive power compensation, the Static Synchronous Compensator (STATCOM a.k.a. SVG) is widely used to realize the compensation of the reactive, harmonic and asymmetric currents. The traditional controller, which is composed of several proportional–integral (PI) controllers, has difficulties to eliminate the steady-state error when the STATCOM needs to provide the compensation ability of the harmonic and asymmetric currents. Therefore, the composite controller composed of the resonant and PI controllers is introduced to realize the tracking control of the DC instruction currents based on the d–q synchronous reference frame. Consequently, the high tracking accuracy and the rapid response character are integrated in the advanced controller. To make the compensation more flexible, a detection approach of the reference harmonic current based on the d–q synchronous reference frame and the discrete Fourier transform (DFT) is proposed and applied to Statcom. The accuracy of the algorithm and frequency applicability of the composite controller is improved by adapting the design of the software phase-locked loop. Moreover, based on the combined circuit topology with multi-field programmable gate array (FPGA), the double-loop control algorithms with the current inner loop and the capacitor voltage outer loop are set up in this paper. The simulation and experiment platform is employed to verify the feasibility and effectiveness of the control strategy.

Current Control Strategy of Cascaded STATCOM with Compensation of Harmonics and Asymmetric Load