A DС/DС Voltage Converter Control System for Solar Panels
Abstract
The article addresses matters concerned with improvement of electric power converters for solar power facilities with the aim to improve the output voltage quality. The object of the study is a direct boost voltage converter for solar panels with a two-loop control system comprising an internal current loop and an external voltage loop. The converter operates in the intermittent choke current mode and performs voltage increasing and stabilizing functions. A method for selecting the parameters of the two-loop converter control system controllers has been developed. A nonlinear dynamic model of the system is considered and studied. It has been revealed that with low load resistances, undesirable oscillations occur in the system, which are not predicted by the low-signal model used in the development of the controller design analysis methodology. A control system structure is proposed that makes it possible to eliminate these oscillations by introducing an additional system for control of nonlinear dynamic processes based on the target direction method. The optimal set of phase variables used to produce corrective actions at the output of the system controlling the nonlinear dynamic processes is determined. Studies were conducted that have shown the effectiveness of the adopted solutions.
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