Voltage profile quality of conformance evaluation with process capability analysis in the presence of distributed generation

Quality is defined as meeting the requirements of the customers, so it is vital for distribution companies to provide electric power with specified voltage in all time for all customers in the competitive energy market. In the absence of distributed generation (DG) it is possible to control voltage profile with proper network design and optimized setting of high voltage transformer online tap changers, but in the presence of DG, especially renewable resource like photovoltaic panels and wind turbines, the voltage profile is affected by stochastic behaviour wind velocity, sun light and DG owners decisions. In this study process capability analysis and statistical control chart have been used together to evaluate of distribution system capability to maintain voltage in design level and to detect abnormalities in voltage profile in the presence of distributed generation.