Performance of Shunt Active Power Filter Under Sensor Failure

This paper shows the performance of Shunt Active Power Filter (SAPF) under failure of various sensors. The SAPF have been developed on the basis of Instantaneous Reactive Power Theory (also known as P-Q theory) to generate reference current for harmonic mitigation. The controller aims at the power quality improvement of a power system with the nonlinear load by using SAPF (Shunt Active Power Filter). In general, P-Q theory based controller requires the information of three load currents and three source voltages. Hence, the controller requires information from six sensors. Therefore, failure of any one sensor will affect the overall performance of the SAPF. Here, performance of SAPF under failure of single and multiple sensors is studied. A comparative study has been performed to demonstrate effect on the performance of SAPF under various sensor failure conditions. The power system with compensation has been analyzed in MATLAB/SIMULINK environment through simulations for the conditions of sensor failures, which serves as functional candidates for the P-Q algorithm. Different combinations (i.e., failure of sensors) have been studied to observe its effect on THD in source current. Further, an algorithm for successful compensation of one voltage and one current sensor failure (simultaneously or individually) have been proposed under balanced conditions and successfully verified on MATLAB/SIMULINK platform.