Comparison of Control Techniques Applied to Photovoltaic Boost Converters
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Figueira, Henrique Horst
Michels, Leandro
Basquera Júnior, Mauro Fernando
Bellinaso, Lucas Vizzotto
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Grid-tie photovoltaic (PV) inverters are usually composed of two conversion stages: a dc-dc boost converter and a dc-ac converter. The dc-dc boost converter is mainly responsible for extracting the maximum power from the photovoltaic array. Several control strategies have been proposed in the literature for controlling the dc-dc boost converter. However, PV systems have characteristics that impact on transient and steady state response because its small signal model is irradiance-dependent and its dc bus has oscillations (120Hz) due to inverter modulation. Thus in order to contribute to this field and support control designers, this manuscript compares three control strategies applied to PV boost converters: a simple perturbation and observation (P&O) maximum power point tracking (MPPT) algorithm controlling directly the duty cycle; a MPPT algorithm associated with a voltage controller; and a MPPT algorithm with cascaded voltage and current control. Experimental results are presented for comparison. Results show the third strategy (MPPT with cascade control) provides the best results for most comparison criteria.
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