Direct control for AC/DC/AC converter-fed induction motor with active filtering function

Purpose - Proposes the application of novel control strategy in power transistors (insulated gate bipolar transistors - IGBT) based on AC/DC/AC converter with active filtering function. Seeks to investigate the possibilities of operating drive system under distorted line voltage with unity power factor and reduced dc-link capacitor. Design/methodology/approach - A novel control strategy is proposed based on direct power and direct torque control with space vectors modulators scheme which seems to be most promising. This method is investigated, implemented and examined in the laboratory setup. Different working conditions are taken into consideration. Findings - Provides information how the proposed system works wider motoring and regenerating modes. Good behaviors of the system in steady state in transience are shown. Very good stabilization of the dc-link voltage under transient is achieved. Almost sinusoidal line current is obtained. Very good compensation of nonlinear load is also achieved. Research limitations/implications - This is not an exhaustive investigation. The system should be tested with different input inductances (or LCL filters) and with reduced dc-link capacitor. Moreover, laboratory tests with higher power should be performed in the future. Practical implications - A useful source of information and an example of how a fully controlled AC/DC/AC converter with active filtering function works. It could be an important basis for a prototype for industry. Originality/value - Although the direct power control with space vector modulator (DPC-SVM) and direct torque control with space vector modulator (DTC-SVM) schemes have been described in the literature separately, it is analyzed for the first time and investigated together for control of the AC/DC/AC converter. Additionally, active filtering provides a feature of power compensation. It could be the basis for a clean power system design.