Multiple-Loop Control Design for a Single-Stage PV-Fed Grid-Tied Differential Boost Inverter
Source abstract
Abstract
This paper focuses on the control design of a differential boost inverter when used in single-stage grid-tied PV systems. The inverter performs both Maximum Power Point Tracking (MPPT) at the DC side and Power Factor Correction at the AC side. At first, the state-space time-domain averaged model of the inverter is derived and the small signal frequency domain model is obtained using a quasi-static approximation in which the inverter is treated as a DC–DC converter with a slowly varying output voltage. Then, the controllers are designed using a three-loop strategy in which the inverter inductor currents loop is used for suitable compensation, the DC Photovoltaic (PV) voltage loop is used for MPPT and the output grid current loop is used for Power Factor Correction (PFC) and active power control. The selection of the control parameters is based on a compromise among suitable system performances such as settling time of the input PV voltage, the sampling period of the MPPT, total harmonic distortion of the output grid current, power factor as well as suppression of subharmonic oscillation for all the range of the operating duty cycle. The resulting design ensures that the oscillations of the voltage, current and power at the DC side and the grid current at the AC side are effectively controlled. The validity of the proposed control design is verified by numerical simulations performed on the switched model of the system demonstrating its robustness and fast response under irradiance variations and MPPT perturbations despite the nonlinearity and complexity of the system.
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Research context
OpenAlex topics: Microgrid Control and Optimization · Photovoltaic System Optimization Techniques · Advanced Battery Technologies Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Electronics, Electrical Engineering and Automatic Control, Universitat Rovira i Virgili, 43007 Tarragona, Spain
Electrical Engineering Department, King Saud University, Riyadh 11451, Saudi Arabia
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
Funding
Researchers Supporting Project, King Saud University, Riyadh, Saudi Arabia · Spanish Agencia Estatal de Investigaci\'{o}n (AEI) and the Fondo Europeo de Desarrollo Regional (FEDER)
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