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Direct-sequence spread-spectrum (DSSS) and frequency-hopping spread-spectrum (FHSS) modulation techniques have been proposed for the operation of three-phase voltage-source rectifiers (VSR) for the mitigation of EMI in AC Grid. For the first time, in the DSSS modulation technique, binary phase shift keying and quadrature phase shift keying (QPSK) techniques have been adopted for the mitigation of electro-magnetic interference (EMI) in three-phase VSR. A cost-effective field programmable gate array (FPGA) has been employed for carrying out these proposed modulation techniques. A VHDL coding for each modulation technique is written in ISE Xilinx, verified by Model-Sim tool and then implemented using FPGA to produce gate pulses for the rectifier. Rather than building a modulator physically, the control logic is implemented using low-cost FPGA, resulting in the cost and size reduction of the control circuit. The modulation techniques recommended in this paper are compared with the traditional sinusoidal pulse width modulation (SPWM). It is shown that the FHSS and QPSK techniques proposed in this paper result in improved power quality and the conducted EMI levels are reduced by 22.1 and 12.4 dBµV, respectively, when compared with SPWM.

Suppression of EMI Using Cost-Effective FPGA-Based Digital Communication Modulation Techniques in Power Converters