POWER QUALITY IMPROVEMENT IN SINGLE DISTRIBUTION SYSTEM USING RENEWABLE ENERGY BSAED ON UNIFIED POWER QUALITY CONTROLLER (UPQC)

Electrical and Electronics Engineering

Voltage sags result in unwanted operation stops and large economic losses in industrial applications. A Unified Power Quality Controller (UPQC) is a power-electronics-based device conceived to protect high-power installations against these events. However, the design of a UPQC control system is not straightforward and it has some peculiarities. First of all, a UPQC includes a resonant (LC) connection filter with a lightly damped resonance. Secondly, the control system of a UPQC should work properly regardless of the type of load, which can be linear or non-linear, to be protected. In order to improve the utilization rate and power quality of distributed new energy power generation technology and, to solve the voltage fluctuation problem in the operation of the distributed photovoltaic storage and grid-connected system. This project proposes a control strategy based on UPQC (Unified Power Quality Controller) for operation of distributed photovoltaic storage and grid-connected. The remaining photovoltaic output energy is stored in energy storage via active bridge to reduce the waste of photovoltaic power To compensate the output voltage fluctuation of photovoltaic grid-connected inverter, the UPQC was connected to the energy storage. And PI controller parameters of the UPQC are optimized by ANFIS algorithm, realize the recovery of output voltage fluctuation of the photovoltaic grid-connected inverter. The advantages of the proposed control strategy are demonstrated using simulations, and the results show that the proposed strategy can ensure the quality of PV output voltage in the photovoltaic storage and grid connected. PV based UPQC system is comprised of PV System with low and high power DC-DC boost converter, PWM voltage source inverter, series injection transformer and semiconductor switches. Simulation results proved the capability of the proposed UPQC in mitigating the voltage sag, swell and outage in a low voltage distribution system.

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