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Power quality control in grid-interactive micro-power systems

A micro-power system is a cluster of renewable or non-conventional green energy based micro-power sources for short range power supply. These sources can operate in either grid connected or in islanded mode. Micro-sources forming distributed generators resemble converter-inverter type topologies behaving as non-linear loads and sourcing harmonics. The negative effects on power quality caused by the interaction of grid with distributed power processing units are clearly witnessed. To account for power quality problems in micropower systems operating at different voltage levels with the main grid, a modular approach is proposed. The system design primarily consists of two synchronized decentralized subsystems each for harmonic compensation and active-reactive power sharing. Simultaneous operation of these subsystems improves power quality significantly. Results are validated to be in consistency with IEEE allowable penetration levels.