Impedance Matching in Photovoltaic Systems Using Cascaded Boost Converters and Sliding-Mode Control

Haroun, Reham; Aroudi, Abdelali El; Cid-Pastor, A.; Garica, Germain; Olalla, Carlos; Martínez-Salamero, L.

doi:10.1109/tpel.2014.2339134

Cited by 123 publications

(78 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The scheme includes a voltage source as the system load, this to model the DC-link of double-stage structures in commercial PV inverters, in which the DC/AC stage regulates the DC-link voltage (C b capacitor voltage) [25]. This voltage source model is widely used to represent the closed-loop grid-connected inverters due to its satisfactory relation between accuracy and simplicity, which is confirmed in references [3,17,[25][26][27][28][29].…”

Section: System Modelmentioning

confidence: 84%

See 1 more Smart Citation

Sliding-Mode Controller for Maximum Power Point Tracking in Grid-Connected Photovoltaic Systems

Valencia

Ramos‐Paja

2015

Energies

View full text Add to dashboard Cite

Abstract:The maximum power point tracking (MPPT) of photovoltaic systems must be as fast and accurate as possible to increase the power production, which eventually increases the PV system profitability. This paper proposes and mathematically analyses a sliding-mode controller to provide a fast and accurate maximum power point tracking in grid-connected photovoltaic systems using a single control stage. This approach avoids the circular dependency in the design of classical cascade controllers used to optimize the photovoltaic system operation, and at the same time, it reduces the number of controllers and avoids the use of linearized models to provide global stability in all the operation range. Such a compact solution also reduces the system cost and implementation complexity. To ensure the stability of the proposed solution, detailed mathematical analyses are performed to demonstrate the fulfillment of the transversality, reachability and equivalent control conditions. Finally, the performance of the proposed solution is validated using detailed simulations, executed in the power electronics simulator PSIM, accounting for both environmental and load perturbations.

show abstract

Section: System Modelmentioning

confidence: 84%

“…Finally, since the equivalent control condition for a DC/DC converter application is 0 < u eq < 1, such an expression is analyzed using the u eq value given in Equation (29), which leads to expression Equation (30):…”

Section: Ds/dtmentioning

confidence: 99%

Sliding-Mode Controller for Maximum Power Point Tracking in Grid-Connected Photovoltaic Systems

Valencia

Ramos‐Paja

2015

Energies

View full text Add to dashboard Cite

show abstract

“…Note that the intersection of them is the working point of PV panel, so the conductance (slope of LFR load line) can be tuned to search the optimal operating point of solar system through modifying g conductance value [23], [24]. The following two sliding mode control surfaces are also set to behave as switches for each boost converters:…”

Section: A Pv Impedance Matching and Sliding Mode Controllermentioning

confidence: 99%

“…This key information will be sent to a logic circuit that can determine the next direction of maximum power point tracking control signal maintained or changed. In the last stage, the control signal of searching direction is introduced to an integrator to get the conductance g1 of first stage boost converter [23], [28]. For the voltage control at the terminal of cascaded boost converters, a PI controller is established to generate g2 as the conductance value of the second LFR.…”

Section: B Maximum Power Point Tracking Techniquementioning

confidence: 99%

“…Under sliding mode conditions, the control laws which describe the dynamic behavior of the system that is restricted to the two switching surfaces can be obtained as follows: (12) (13) where m 2 and m 3 are constants, is the next direction of maximum power tracking and is a time constant. It should be noted that the control variables u 1 and u 2 are PWM signals which must be bounded between minimum 0 and maximum 1 [23], i.e. :…”

Section: Mathematical Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Sliding mode control of a DC distributed solar microgrid

Shen

Izadian

2015

2015 IEEE Power and Energy Conference at Illinois (PECI)

View full text Add to dashboard Cite

Abstract-This paper proposes a standalone distributed photovoltaic system which includes two independently controlled solar power sources, a battery storage and a resistive load. Each of the PV panels consist of cascaded DC-DC boost converters controlled through two independent sliding mode controllers. The design and simulation of the supervisory controller are also discussed. First, maximum power point tracking (MPPT) control strategy is introduced to maximize the simultaneous energy harvesting from both renewable sources. Then, according to the power generation available at each renewable source and the state of charge in the battery, four contingencies will be considered in the supervisory controller. Moreover, power converters interfacing the source and common DC bus will be controlled as voltage sources under a PI-sliding mode controller. Numerical simulations demonstrate accurate operation of the supervisory controller and functionality of the MPPT algorithm in each operating condition.

show abstract

Fast‐scale stability limits of a two‐stage boost power converter

Aroudi

Mandal

Giaouris

et al. 2015

Circuit Theory & Apps

Self Cite

View full text Add to dashboard Cite

There are many applications in power electronics that demand high step-up conversion ratio between the source and the load. A simple way of achieving such a high voltage ratio is by cascading DC-DC boost converters in a few stages. The individual converters in such a cascaded system are usually designed separately applying classical design criteria. This paper investigates the stability of the overall system of a cascade connection of two boost converters under current mode control. We first demonstrate the bifurcation behavior of the system, and it is shown that the desired periodic orbit can undergo fast-scale period doubling bifurcation leading to subharmonic oscillations and chaotic regimes under parameter variation. The value of the intermediate capacitor is taken as a design parameter, and we determine the minimum ramp slope in the first stage required to maintain stability. It is shown that smaller capacitance values give rise to wider stability range. We explain the bifurcation phenomena using a full-order model. Then, in order to simplify the analysis and to obtain a closed-form expression to explain the previous observation, we develop a reduced-order model by treating the second stage as a current sink. This allows us to obtain design-oriented stability boundaries in the parameter space by taking into account slope interactions between the state variables in the two stages.where m ref1,ON is the slope of the current reference i ref1 during the ON phase to be determined in the 1138 A. EL AROUDI ET AL.

show abstract

Impedance Matching in Photovoltaic Systems Using Cascaded Boost Converters and Sliding-Mode Control

Cited by 123 publications

References 38 publications

Sliding-Mode Controller for Maximum Power Point Tracking in Grid-Connected Photovoltaic Systems

Sliding-Mode Controller for Maximum Power Point Tracking in Grid-Connected Photovoltaic Systems

Sliding mode control of a DC distributed solar microgrid

Fast‐scale stability limits of a two‐stage boost power converter

Contact Info

Product

Resources

About