Improved Design of Sliding-Mode Controllers Based on the Requirements of MPPT Techniques

Montoya, Daniel; Ramos‐Paja, Carlos Andrés; Giral, Roberto

doi:10.1109/tpel.2015.2397831

Cited by 120 publications

(81 citation statements)

References 25 publications

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“…A converter can be operated with an accurate voltage regulation at PSCs and load variations because this adds one more integral part into the sliding surface of a controller [54]. The main advantage of this technique is that the system stability is retained over the parameters, input values, and load variations within the PV system [54,55].…”

Section: Other Mppt Techniquesmentioning

confidence: 99%

Performance Evaluation of Maximum Power Point Tracking Approaches and Photovoltaic Systems

et al. 2018

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This paper elaborates a comprehensive overview of a photovoltaic (PV) system model, and compares the attributes of various conventional and improved incremental conductance algorithms, perturbation and observation techniques, and other maximum power point tracking (MPPT) algorithms in normal and partial shading conditions. Performance evaluation techniques are discussed on the basis of the dynamic parameters of the PV system. Following a discussion of the MPPT algorithms in each category, a table is drawn to summarize their key specifications. In the performance evaluation section, the appropriate PV module technologies, atmospheric effects on PV panels, design complexity, and number of sensors and internal parameters of the PV system are outlined. In the last phase, a comparative table presents performance-evaluating parameters of MPPT design criterion. This paper is organized in such a way that future researchers and engineers can select an appropriate MPPT scheme without complication.

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Section: Other Mppt Techniquesmentioning

confidence: 99%

Performance Evaluation of Maximum Power Point Tracking Approaches and Photovoltaic Systems

et al. 2018

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“…To ensure the existence of the sliding-mode, thus the system global stability, three conditions must be fulfilled [44]: transversality, reachability and equivalent control. However, Sira-Ramirez demonstrated in [45] that equivalent control and reachability conditions are equivalent.…”

Section: Sliding-mode Controllermentioning

confidence: 99%

“…The mathematical representation of the transversality test is given in Expression (12) [44], which means that the control signal u must be present into the switching function derivative (11). The fulfillment of condition (12) ensures the controller is able to modify the behavior of the switching function Ψ, which makes it possible to drive Ψ to operate within the sliding surface Φ.…”

Section: Transversality Conditionmentioning

confidence: 99%

Design and Control of a Buck–Boost Charger-Discharger for DC-Bus Regulation in Microgrids

et al. 2017

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Abstract:In DC and hybrid microgrids (MG), the DC-bus regulation using Energy Storage Devices (ESD) is important for the stable operation of both the generators and loads. There are multiple commercial voltage levels for both ESD and DC-bus; therefore, the ESD voltage may be higher, equal or lower than the DC-bus voltage depending on the application. Moreover, most of the ESD converter controllers are linear-based, hence they ensure stability in a limited operation range. This paper proposes a system to regulate the DC-bus voltage of an MG accounting for any voltage relation between the ESD and the DC-bus voltage. The proposed system is formed by an ESD connected to a DC-bus through a bidirectional Buck-Boost converter, which is regulated by a Sliding-Mode Controller (SMC) to ensure the system stability in the entire operation range. The SMC drives the Buck-Boost charger-discharger to regulate the DC-bus voltage, at the desired reference value, by charging or discharging the ESD. This paper also provides detailed procedures to design the parameters of both the SMC and the charger-dischager. Finally, simulation and experimental results validate the proposed solution and illustrate its performance.

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“…The reachability condition is used to determinate the capacity of system to reach the sliding surface from whatever arbitrary point. The reachability depends of the sign of transversality [30], and therefore its definition is:…”

Section: Tracking Of the Current Referencementioning

confidence: 99%

Operation of a Photovoltaic Microinverter as Active Power Filter using the single phase P-Q Theory and Sliding Mode Control

López-Santos

Tilaguy-Lezama

Rico-Ramírez

et al. 2017

Ing.

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Context: Microinverters are widely used in modular photovoltaic installations but its operation with reduced power is limited to inject real power into the grid. One way to optimize the use of microinverters consist of providing them the Active Power Filtering (APF) capability, which allows its use as both distributed generation and compensation unit even under unfavorable conditions of insolation. With this approach, the output stage of the microinverter can provide reactive and distortive components of power in order to compensate power quality defects of a localized load. Method: This paper proposes a non-linear control strategy to integrate the APF function in a singlephase two-stage photovoltaic microinverter. The proposal involves the use of the single-phase P-Q theory to generate the current reference, sliding mode control to achieve a robust tracking of that reference and linear robust control to maintain the power balance regulating the DC-link voltage of the microinverter. The proposed control does not require the use of low-pass filters and in turn uses a recursive average computation improving the general performance of the system. Results: The theoretical approach is validated by means of simulation results in which appropriate levels of harmonic distortion are obtained in the grid-side current for different load types and power levels. The robustness of the control system is tested by applying disturbances in the harmonic content of the load current and its power level obtaining an appropriate dynamic performance adapted to the demands of the application. Conclusions: The main advantage of this proposal is the possibility to add the active filter function to coventional microinverters extending its capability to power conditioning only integrating some algorithms. A simple design method to ensure reliability, robustness and high power quality is detailed. ResumenContexto: Los microinversores son ampliamente utilizados en instalaciones fotovoltaicas modulares pero su operación con potencia reducida es limitada a inyectar potencia real en la red. Una forma de optimizar el uso de los microinversores consiste en proveerles la capacidad para realizar Filtrado Activo de Potencia (FAP), lo que permite su uso como una unidad tanto de generación como de compensación distribuida, incluso en condiciones desfavorables de irradiación solar. Con esta propuesta, la etapa de salida del microinversor puede suministrar componentes de potencia reactiva y de distorsión para compensar defectos en la calidad de energía de una carga localizada. Método: Se propone una estrategia de control no lineal para integrar la función FAP en un microinversor fotovoltaico monofásico de dos etapas. La propuesta involucra el uso de la teoría P-Q monofásica para generar la referencia de corriente, control en modo deslizante para conseguir un seguimiento robusto de dicha referencia y control lineal robusto para mantener el balance de potencia regulando el voltaje del bus DC intermedio del microinversor. El control propuesto no r...

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Improved Design of Sliding-Mode Controllers Based on the Requirements of MPPT Techniques

Cited by 120 publications

References 25 publications

Performance Evaluation of Maximum Power Point Tracking Approaches and Photovoltaic Systems

Performance Evaluation of Maximum Power Point Tracking Approaches and Photovoltaic Systems

Design and Control of a Buck–Boost Charger-Discharger for DC-Bus Regulation in Microgrids

Operation of a Photovoltaic Microinverter as Active Power Filter using the single phase P-Q Theory and Sliding Mode Control

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