Shunt Active Filters

This chapter covers in detail shunt active filters, including applications to three phase, four‐wire systems. Additionally, an interesting solution has been proposed for allowing the use of (n‐1)‐leg PWM converter in n‐wire systems. This was enabled by the use of the "split‐capacitor" converter topology. The principle of shunt current compensation is very effective in compensating harmonic currents of loads. The control algorithm implemented in the controller of the shunt active filter determines the compensation characteristics of the shunt active filter. There are many ways to design a control algorithm for active filtering. Certainly, the p‐q theory forms a very efficient basis for designing active filter controllers. The shunt active filter can be properly controlled to present a selective compensation characteristic. The control block that calculates the instantaneous power takes as inputs the phase‐voltages at the point of common coupling (PCC) and the line currents of the nonlinear load that should be compensated.

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