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Adaptive digital proportional–integral–derivative controller for power converters

Adaptive digital proportional–integral–derivative controller for power converters

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An adaptive digital proportional–integral–derivative (AD-PID) controller scheme is presented in this study to improve the dynamic performance of power converters. The controller adaptively adjusts the integral constant (Ki) and the proportional constant (Kp) following a new control law. The control law is a function of the magnitude change in the error signal and its peak value during dynamic transients. The proposed AD-PID controller adaptively detects the peak value of the error signal, which is a function of the transient nature and magnitude and utilises it in the control law such that no oscillations are generated as a result of the adaptive operation. As a result, the dynamic output voltage deviation and the settling time of the output voltage are reduced. The concept and architecture of the proposed AD-PID are presented and its proposed control law is discussed and verified by experimental results obtained from a single-phase DC–DC buck converter with input voltage range of 8–10 V, nominal output voltage of 1.5 V and a maximum load current of 7 A.

Inspec keywords: DC-DC power convertors; adaptive control; three-term control

Other keywords: AD-PID controller scheme; integral constant; voltage 8 V to 10 V; voltage 1.5 V; current 7 A; single-phase DC-DC buck converter; dynamic output voltage deviation; adaptive digital proportional-integral-derivative controller; power converters; dynamic transients; proportional constant

Subjects: Self-adjusting control systems; Power electronics, supply and supervisory circuits; Control of electric power systems

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