Abstract
In the past few years, the number of large-scale photovoltaic (PV) power station is increasing quickly. Due to the power fluctuation of PV station, the voltage in the power grid with large-scale PV stations integrated may fluctuate irregularly. It may cause transformer tap or shunt capacitor switching frequently. To smooth the voltage fluctuation, a typical solution is to install energy storage system which needs high investment. The alternative way is to use reactive power to regulate the voltage. This paper introduces the ability of reactive power control to mitigate the above voltage fluctuation problem. An improved ΔQ(ΔP) control is proposed. Comparing with the common Q(U) droop control, the results of an actual PV station case verifies its good performance.
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