Improved TOGI-Based Voltage and Frequency Control for PMSG Feeding Single-Phase Loads in Isolated Pico-Hydro Generation

What is it about?

This paper investigates the performance enhancement of a three-phase permanent magnet synchronous generator (PMSG) feeding a single-phase load for stand-alone pico-hydro generation using improved third order generalized integrator (ITOGI). The proposed algorithm deals with load balancing, harmonics mitigation and reactive power compensation when a three phase PMSG feeds a single phase nonlinear load. The PMSG, voltage source converter (VSC), three phase diode bridge rectifier (DBR) circuit comprising of DBR in series with IGBT switch-based DC-DC converter and a single-phase consumer load, are parallelly interfaced at the point of common interface (PCI). The voltage and frequency control technique (VFC) is used for controlling the VSC in a decoupled manner as it is responsible for voltage control along with the power quality improvement and three phase DBR circuit regulates the system frequency. ITOGI based control algorithm extracts the fundamental component from the nonlinear load current for power quality improvement through proper switching of VSC. The comparative analysis of already existing major state of art techniques is given with ITOGI control technique using a Bode diagram and step response plot. An appropriate tuning procedure for control parameters of this algorithm, is also reported in this work. The simulated behavior of proposed system along with experimental results is recorded on a developed laboratory prototype. It demonstrates the feasibility of proposed ITOGI based control strategy through excellent dynamic and steady state responses when PMSG based pico-hydro system feeds the single-phase loads.

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Why is it important?

The implemented systems are very much beneficial for supplying power to consumers residing in isolated remote areas since most of the consumer loads in these locations are of single phase type.

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