A Sensorless Current Control of Parallel Three Phase Converter Connected to Grid

Abstract

The performance of an interleaved parallel converter is essentially dependent on the precise measurement of the output current converter and its accurate control method. Generally, current sensors are extensively used for this purpose. However, sensors have some disadvantages such as high cost of hardware equipment, and generation of noises. Hence, the reduction of sensor's number used in the control chain can be considered as an efficacious solution for these problems. This paper proposes to use the Kalman filter as an estimator to current magnitude instead of the use of current sensors. The current control strategy used here is a Linear Quadratic Control combined with Kalman filter. This combination leads to diminishing the circulating current flowing between converters. The estimated currents are compared to the measured current. The simulation result proves that the Kalman filter is a performed estimated technique.