Abstract
A novel sliding mode control (SMC) method for indirect current controlled three‐phase parallel active power filter is presented in this paper. There are two designed closed loops in the system: one is the DC voltage controlling loop and the other is the reference current tracking loop. The first loop with a PI regulator is used to control the DC voltage approximating to the given voltage of capacitor, and the output of PI regulator through a low‐pass filter is applied as the input of the power supply reference currents. The second loop implements the tracking of the reference currents using integral sliding mode controller, which can improve the harmonic treating performance. Compared with the direct current control technique, it is convenient to be implemented with digital signal processing system because of simpler system structure and better harmonic treating property. Simulation results verify that the generated reference currents have the same amplitude with the load currents, demonstrating the superior harmonic compensating effects with the proposed shunt active power filter compared with the hysteresis method.
Highlights
With the development of modern industry, a variety of nonlinear and time-varying electronic devices such as inverters, rectifiers, and switching power supplies are widely used
Shunt active power filter APF is an effective device to compensate the harmonic currents in power system
According to the IEC-61000 issued by IEC in the year of 2000, harmonic content of the low voltage ≤1 kV should be under 5%, so indirect current controlled active power filter with sliding mode controller has better harmonic compensating effect
Summary
With the development of modern industry, a variety of nonlinear and time-varying electronic devices such as inverters, rectifiers, and switching power supplies are widely used. Active power filter using indirect current control method is designed in 3, 4 , where the power supply current harmonics with sliding mode control was calculated in 3 , and indirect current control technique did not need compensation current measurement, but only detection devices for power supply voltage, power supply current and DC voltage in 4. The sliding mode controller is composed of an equivalent control part that describes the behavior of the system when the trajectories stay over the sliding manifold and a variable structure control part that enforces the trajectories to reach the sliding manifold and prevent them leaving the sliding manifold It is a suitable control method for reference current tracking of active power filter. The contribution of this paper can be summarized as the following
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