Single-phase shunt active filter for customer generated harmonics and reactive power compensation

This paper proposes a conductance emulation based scalar control for shunt active power filter to compensate customer generated current harmonics and reactive power. Proposed technique emulates the combination of nonlinear load and shunt active filter as an equivalent conductance across the source voltage. If the utility voltage is sinusoidal, the shunt active filter compensates total current harmonics and the compensated source is also sinusoidal. However, if the utility voltage is distorted, it allows similar level of distortion in the compensated source current. This result in the shape of the compensated source current is same as the shape of the source voltage. Thus, the proposed algorithm attributes the responsibilities of the customer and utility at the point of common coupling. An inventive feature of the proposed controller is to achieve the conductance emulation without sensing the source voltage. The simulated results are presented with sinusoidal and nonsinusoidal mains voltage condition and are validated experimentally by developing a laboratory prototype of using a low cost, fixed-point TMS320F2812 digital signal processor.