A hybrid PI and PD type fuzzy logic controller for automatic voltage regulation of the small alternator

Integrated Governor Control for a Diesel-Generating Set

“…Other research conducted by this group also in the field of diesel-generating set control has concluded that fuzzy logic techniques can offer improved control of alternator terminal voltage compared with conventional PID techniques [4]. Furthermore, this control was readily implemented in an embedded microprocessor and also in a real-time "PC in-the-loop" development environment.…”

“…The CAN message variable name is fuel ov. The parallel combination of the PD and PI control structures reduces the complexity of the fuzzy PID controller by reduction of the rule base [4], [8]. The proportional gain term is used to aid the tuning of the controller algorithm by enabling the input scaling factors to be fixed.…”

A Digital Load Relief Scheme for a Diesel Generating Set

“…The control algorithm then acts upon the calculated error signal, and takes appropriate corrective action to maintain a constant voltage output. A "muscle and brain" analogy can be used to demonstrate the function of the digital AVR within a closed loop system [6], as illustrated in Fig. 4.…”

“…This type of control strategy is well suited to nonlinear systems such as the synchronous generator, which exhibits nonlinearity between the field current in and the armature voltage out [7]. The structure of the controller employed in the digital AVR is that of a hybrid PI and PD-type fuzzy logic controller with a proportional gain included in parallel [6], as illustrated in Fig. 7.…”

“…In the interest of brevity, the various subsections of the fuzzy logic controller are not detailed in this paper, however more information can be found in [6] and [8]. …”