VSS strategy in energy grid control,

With the introduction of recent standards on limitation of harmonic pollution of electrical power distribution system, three-phase PWM converters are considered as prime candidates to interface high-power electronic equipment to power supply lines. A FPGA based digital control platform for converter system, built in the laboratory, is presented and discussed. This paper proposed a novel predictive variable structure switching (VSS) based current controller for a three-phase load driven by a power converter. The design specifications are robustness to load electrical parameters, fast dynamic response, reduced switching frequency, and simple hardware implementation. In order to meet previous specifications, a sliding mode controller has been developed, designed as finite state machine (FSM), and implemented with a field programmable gate array (FPGA) device. The switching strategy implemented within the state transition diagramme provides for a minimum number of switches by the three-phase converter that is confirmed through simulation and experimental results.