Reactive Power Management In A Distribution System By Photovoltaic Inverter

Abstract

Nowadays the electrical generation from the solar photovoltaic resource is extensively promoted because of the concern about greenhouse gas emission. A distribution system can be powered by a variety of solar photovoltaic resources, and can be used for various objectives, it can improve voltage profile problems and can reduce real power losses of the upgrading process of transmission and distribution system. However, presence much of the PV system may have detrimental impacts on the operation of the distribution system because of the variation of solar photovoltaic increases. This thesis proposed the optimal reactive power control modes by PV inverters when the overvoltage impact occurs in the distribution system. The results of these optimal values, there are set to unity power factor, fixed power factor, power factor as , and Q(V) characteristic function. In order the inverter can control Q modes. From tested on IEEE 33 bus radial distribution system and used in MATPOWER toolbox and simulated in MATLAB programs. Therefore, the calculation of optimal reactive power from the inverter can to improve the voltage profile and to reduce real power losses when active power change.

In contrast, the voltage changes and over the limits, the PV inverter can inject or absorb reactive power. The optimal reactive power control mode is calculated to minimize losses of all buses by the proposed method based on Newton-Raphson power flow. The IEEE 33 bus radial distribution system is selected to analyze the loss and voltage profile problem in various conditions.