Multifunctional current-controlled DSTATCOM with harmonic mitigation through voltage detection

This paper presents a control scheme for Static Compensators applied in distribution systems (DSTATCOM), that are used for regulation of voltage magnitude at point of common coupling (PCC) and it also has the function of eliminating harmonics of voltage through PCC-voltage-detection method. Voltage-magnitude regulation is accomplished through quadrature-current injection at PCC and harmonic mitigation is released reading the voltage at PCC and producing harmonic currents capable of voltage-distortion compensation at PCC. Using this method there is not necessity of source or load-current measurement. The voltage regulator was implemented using a four-wire three-phase shunt-connected VSI. Consumption of active power is needed to compensate converter´s losses and regulate dc-link voltage. Simulation and preliminary experimental results of the complete system are presented to demonstrate the effectiveness of the solution.