This paper proposes the design of a new adaptive power control scheme for full bridge series-parallel resonant inverter with AVC control strategy. This scheme is used to control the heating process by adjusting the output power of the inverter irrespective of load and line variations. Two independent control loops are used in this technique: power control loop and frequency control loop (PLL). In the first, an adaptive PID controller with parallel structure is used to force the output power to track the desired trajectory. The adaptive PI controller of the PLL varies the DC input of the VCO in order to generate the required output frequency to maintain ZVS operating during the heating process. The desired performances of the closed loop control are given by two independent reference models. The design of the adaptive mechanism is based on MIT rule and the small signal model of the inverter around the operating point. Compared with other works, the adaptive mechanism redesigns the parameter gains of the PID and the PI controllers in order to avoid the disturbance. Simulation results confirm the effectiveness of the proposed system.
H Bridge Resonant Inverter, Induction Heating, PLL, PI, PID, MIT rule, Design, Simulation.
M'Hamed HELAIMI, Djilali BENYOUCEF, Rachid TALEB, Bachir BELMADANI, "A New Adaptive Control Scheme for Induction Heating System", Studies in Informatics and Control, ISSN 1220-1766, vol. 24(2), pp. 181-190, 2015. https://doi.org/10.24846/v24i2y201506
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