期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 31, 期 1, 页码 235-247出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2015.2397831
关键词
DC-DC power converter; maximum power point tracker; Nonlinear control systems; photovoltaic system; sliding mode control
资金
- Universidad Nacional de Colombia [RECONF-PV-25633]
- Departamento Administrativo de Ciencia, Tecnologia e Innovacion-COLCIENCIAS, Colombia [2012-567]
- Universitat Rovira i Virgili
- Spanish Ministerio de Economia y Competitividad [CSD2009-00046, TEC2012-30952]
In many grid-connected applications, a dc/dc switching converter is usually connected between the PV modules and the inverter. This paper presents an improved procedure to design a sliding controller for the PV system, which drives the PV voltage to follow a reference provided by an external MPPT algorithm and mitigates the perturbations caused by the irradiance changes and oscillations in the bulk voltage. By considering that the switching surface is the linear combination of the input capacitor current and the PV voltage error, the proposed design exhibits advantages in comparison with existing solutions that rely in the linearization of inner current loop dynamics. The proposed integral procedure, by taking also into account the effects in the closed-loop system dynamics of a reference filter, ensures a stable sliding regime in all the desired operation range of the system, while the settling time and overshoot of the PV voltage required by an MPPT algorithm are provided. Differently from a previous similar but less rigorous approach, the switching function and reference filter parameters are obtained by numerically solving a set of nonlinear equations. Simulations and experiments were used to demonstrate the efficiency of the proposed solution in presence of environmental and load perturbations.
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