Active power filter with minimum components

This thesis describes the development of a novel form of single and three-phase Active Power Filter (APF) which require less components than normal. This is achieved by making use of energy storage components which are already present in the system and at the load. The implementation of a single-phase APF, which requires just one bidirectional switch across the nonlinear load, is described. A simple control strategy is presented to reduce the current distortion to an acceptable level. Simulation and experimental results for a low power prototype circuit are included showing that current harmonic filtering using this APF circuit is effective. To achieve current harmonic filtering and compensate the negative and zero sequence current in three-phase four-wire systems, a new APF is presented. The proposed APF consists of four bidirectional switches connected in star at the AC terminals of the nonlinear load. A new control algorithm based on three-dimensional vector switch control is derived and implemented on a digital signal processor (DSP) to control the APF. Results from simulation and a 2.5 kVA experimental set-up show the suitability of the proposed approach for the removal of current harmonics and for the compensation of fundamental unbalance currents and reactive power consumed by the load. It is proposed to use the new circuit in a commercial building installation, although there are a number of practical problems to be solved before this can become feasible. These practical problems are investigated in the thesis. The effect of t£ie APF

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