Reducing power fluctuations from wind and photovoltaic systems using discrete Kalman filter

The battery energy storage system (BESS) is extensively used to deal with the fluctuations in grid injected power caused by the variations in wind speed and solar insolation. This paper proposes a Kalman filter based control strategy for reducing the fluctuations in power injection from wind and photovoltaic (PV) system using BESS. The investigated time period is divided into several intervals such that the variation of power fluctuation in each interval can be obtained. The fluctuations are evaluated by determining the maximum and minimum value of the grid injected power in the given interval. Discrete Kalman Filter uses the weighted average value of the maximum and minimum of the fluctuated power of each interval to generate the desired output power of the wind and PV generation such that the fluctuations are drastically reduced.