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access icon free Fuzzy PI controlled inverter for grid interactive renewable energy systems

© The Institution of Engineering and Technology
Received 22/11/2014, Accepted 16/02/2015, Revised 30/01/2015, Published 07/04/2015

In this study, a fuzzy-PI controlled grid interactive inverter has been designed and implemented. The proportional and integral gains of the PI controller are decided and tuned by the fuzzy logic controller (FLC) according to required operation point of the system. Thus, adaptive nature of the FLC and robust structure of the PI controller are synthesised. Eventually, an adaptive PI controller which can adopt changes because of different operation conditions, grid disturbances and natural effects with fast transient response is obtained. Simulation studies are validated with experimental results. Both simulation and experimental results show that proposed system has fast dynamic response and tracks reference current with a low overshot and short settling time. In addition, the waveform of the inverter output current is sinusoidal and also the current is in same phase and frequency with the line voltage. Furthermore, the total harmonic distortion level of the inverter current meets the international standards. In addition, the proposed inverter system is compared with conventional PI controlled grid interactive inverter with various proportional and integral gains.

Inspec keywords: invertors; power grids; fuzzy control; harmonic distortion; reference circuits; robust control; transient response; PI control; power system faults

Other keywords: proportional and integral controller; FLC; total harmonic distortion; dynamic response; grid disturbance; reference current tracking; transient response; fuzzy logic PI controlled inverter; grid interactive renewable energy system

Subjects: Fuzzy control; Control of electric power systems; DC-AC power convertors (invertors)

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