Optimum Frequency Control Method to Counter Prediction Error Effects in Photovoltaic Generators : (Frequency Fluctuation Suppression Method Using Online Adaptive System Constants)

This paper proposes a method of suppressing the frequency change caused by the prediction error in photovoltaic generators (PVs). The power generation output of a PV is predicted using weather information. However, perfect prediction is difficult to obtain using the current prediction method, and there might be a difference between the actual and predicted values. This could lead to a change in the frequency and voltage, thereby leading to deteriorated power quality. Generally, the frequency is controlled by the frequency characteristics of the thermal power generator and the load; however, a PV does not have frequency characteristics. We have confirmed that the frequency change can be suppressed more than ever by adding frequency characteristics to PV by research so far 1 . Therefore, in this paper, we focus on attention to imparting frequency characteristics to PV, and propose an operation method which optimizes not to deviate constantly the change band of frequency.