Performance of 3 Phase Shunt APF with SMC Harmonic Current Control Technique

For harmonic reduction many control techniques are existing for example PI control, dead beat control, and hysteresis control. These techniques have many limitations such as controlled frequency band width, performance depends on parameters of the APF, problem of resonance. This paper provides the harmonic current control technique to reduce the harmonics of the three phase nonlinear loads. Active power filters are more frequently used to improve the power quality which reduce harmonics related with linear and nonlinear loads. Based on this SMC (sliding mode control) harmonic current control technique shunt active power filter is developed to reduce the total harmonic distortion (THD) of the load current. Sliding mode control provides good solution to shunt APF in controlling the harmonic currents. Performance of sliding mode control depends on the design of the sliding surface and the control law. Variation in the system parameters does not affect controller, and this method has good robust control can give faster control response. This method does not involve any complex calculations and this method can be used without calculating actual power and reactive power.