Traditional implementation of sliding-mode controllers, based on hysteresis comparators, exhibits variable switching frequency. Such a condition makes it difficult to select the semiconductor devices, design the passive elements of dc/dc converters, and design the sensing filters usually adopted for removing the switching noise from currents and voltages. Those problems are always present in photovoltaic systems based on variable-frequency sliding-mode controllers. Therefore, this paper proposes an implementation methodology for sliding-mode controllers providing constant switching frequency, which is aimed for grid-connected photovoltaic applications. The proposed solution does not compromise the power production of the PV system, hence it provides the same PV power in comparison with the classical variable-frequency implementation. Finally, the performance and correct operation of the fixed-frequency implementation are demonstrated using both simulation and experimental results.
CITATION STYLE
González Montoya, D., Ortiz Valencia, P. A., & Ramos-Paja, C. A. (2019). Fixed-frequency implementation of sliding-mode controllers for photovoltaic systems. International Journal of Energy and Environmental Engineering, 10(3), 287–305. https://doi.org/10.1007/s40095-019-0306-z
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