Abstract
In order to improve the performance of active power filter (APF), a novel compound control method combining input/output exact feedback linearization and double hysteresis control for shunt APF is proposed in this chapter. By the application of input/output exact feedback linearization theory, the model of APF under the synchronous orthogonal “dq” frame is decoupled. A new method to calculate the reference voltage vector of the double hysteresis system through the control variables of main circuit’s switch function under the synchronous orthogonal “dq” frame is proposed. With the double hysteresis pulse width modulation (PWM) strategy based on voltage space vector, the switching frequency of APF is reduced efficiently and the dynamic performance of the whole APF system is improved. Simulation results showed that the system had good compensation performances in both steady state and transient operation based on the proposed compound control method. Besides, the system is characterized by a fast dynamic response and reduced switching frequency. After the compensation, the total harmonic distortion (THD) of the power source currents in steady state is limited to fewer than 2%.
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