Abstract
Photovoltaic generation is being rapidly developed as a clean energy source. The increased penetration of photovoltaics into power distribution networks has led to power-quality problems. A unified power-quality conditioner (UPQC) is an effective device for power-quality treatment and can compensate for voltage fluctuations and sags in a photovoltaic microgrid. This paper proposes a proportional---integral (PI) controller for detecting and compensating for voltage sags in a UPQC that is based on the chaotic immune genetic algorithm. Simulations showed that the proposed PI controller better compensates for the voltage than the traditional PI controller. Experimental results also showed that the new method can accurately detect and compensate for voltage sags in a photovoltaic microgrid in real time. The proposed PI controller can quickly detect voltage sags and improve the microgrid power quality; it provides a new approach to treating the power quality of a photovoltaic microgrid with a UPQC.
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