Design and passivity-based stability analysis of a PI current-mode controller for dc/dc boost converters

Krommydas, Konstantinos F.; Alexandridis, Antonio T.

doi:10.1109/acc.2014.6859156

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…At this point, in order to come back into the forced original system we construct the composite Lyapunov function [20] consisting of both the storage function H , obtained from the passivity analysis, and the Lyapunov function 2 V resulting from the linear subsystem stability. Therefore, we introduce, for the forced closed-loop system (6), the following positive definite Lyapunov function…”

Section: B Stability Analysis Of the Closed-loop Systemmentioning

confidence: 99%

Nonlinear controller design and stability analysis under power management of autonomous PV systems

Krommydas

Alexandridis

2014

22nd Mediterranean Conference on Control and Automation

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A stable controller and power management design for an autonomous photovoltaic (PV) system that includes battery storage devices is proposed in this paper. Both the PV and the storage system are interfaced to a dc load, each via a dc/dc boost power electronic converter. To proceed with the system stability analysis, the complete nonlinear dynamic model of the composite system is developed by taking into account the PV source, battery and converters dynamics. It is shown that the open-loop system has the passivity property, which is preserved in the closed-loop form by suitably designing proportional-integral controllers for the duty-ratio inputs of the power converters. Based on this property, a new sequential method is developed that provides a Lyapunov function capable to prove input-to-state stability (ISS) for the closed-loop system. The ISS property is finally combined with an appropriate power management strategy to guarantee stable operation of the complete autonomous PV system. Simulation results under two different scenarios verify the theoretical analysis and the good performance of the system.

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Section: B Stability Analysis Of the Closed-loop Systemmentioning

confidence: 99%

Nonlinear controller design and stability analysis under power management of autonomous PV systems

Krommydas

Alexandridis

2014

22nd Mediterranean Conference on Control and Automation

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“…Nevertheless, as explained in [21], the presence of the non-minimum phase propitiated by the Right Half Plane Zero (RHPZ) in its transfer function, makes it a more challenging topology compared to buck converters or other topologies without RHPZ for MPPTs algorithms, since the algorithms could fall into erroneous behaviors due to the characteristic behavior of non-minimum phase elements, in this case since the voltage against each duty cycle change will first go in the opposite direction to the point at which it will stabilize (as explored by the resulsts presented in [22]), causing in turn erroneous readings that may cause confusion in control systems (as further explored in [23]).…”

Section: Introductionmentioning

confidence: 99%

Improved MPPT Algorithm for Photovoltaic Systems Based on the Earthquake Optimization Algorithm

et al. 2020

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Nowadays, owing to the growing interest in renewable energy, Photovoltaic systems (PV) are responsible of supplying more than 500,000 GW of the electrical energy consumed around the world. Therefore, different converters topologies, control algorithms, and techniques have been studied and developed in order to maximize the energy harvested by PV sources. Maximum Power Point Tracking (MPPT) methods are usually employed with DC/DC converters, which together are responsible for varying the impedance at the output of photovoltaic arrays, leading to a change in the current and voltage supplied in order to achieve a dynamic optimization of the transferred energy. MPPT algorithms such as, Perturb and Observe (P&O) guarantee correct tracking behavior with low calibration parameter dependence, but with a compromised relation between the settling time and steady-state oscillations, leading to a trade off between them. Nevertheless, proposed methods like Particle Swarm Optimization- (PSO) based techniques have improved the settling time with the addition of lower steady-state oscillations. Yet, such a proposal performance is highly susceptible and dependent to correct and precise parameter calibration, which may not always ensure the expected behavior. Therefore, this work presents a novel alternative for MPPT, based on the Earthquake Optimization Algorithm (EA) that enables a solution with an easy parameters calibration and an improved dynamic behavior. Hence, a boost converter case study is proposed to verify the suitability of the proposed technique through Simscape Power Systems™ simulations, regarding the dynamic model fidelity capabilities of the software. Results show that the proposed structure can easily be suited into different power applications. The proposed solution, reduced between 12% and 36% the energy wasted in the simulation compared to the P&O and PSO based proposals.

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“…Contrary to this, the design of the slow outer-loop controllers can be made independently and many methods have been reported for these designs [17]. Early endeavors for particular power converter based RES controls have been presented by the authors in [18], [19], using advanced nonlinear methods as in the present paper. In other research works such that presented in [20], a rigorous stability analysis has been addressed for simple dc/dc boost converters that proves asymptotic stability under some hard constraints on the controller gain selection.…”

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confidence: 99%

Modular Control Design and Stability Analysis of Isolated PV-Source/Battery-Storage Distributed Generation Systems

Krommydas

Alexandridis

2015

IEEE J. Emerg. Sel. Topics Circuits Syst.

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A distributed generation (DG) system with a photovoltaic (PV) source supported by energy storage devices and feeding dc-and ac-loads in islanded-mode operation, is considered and analyzed. As all the DG parts are interfaced through power electronic dc/dc or dc/ac converters, a control strategy is introduced which is applied directly on each individual duty-ratio converter input. The aim of the control design is to drive the PV-array energy production at the maximum power and to ensure instantaneous power balance in the limits of the storage capacity. In this scheme, critical quality demands are fulfilled, such as operation with constant ac-and dc-voltages at the load sides, independently from the power consumed. The particular controllers are implemented by applying the standard local cascaded structure with the inner-loops being fast nonlinear proportional-integral current-mode controllers. To avoid adverse impacts on the system performance, caused by contradictory actions between the individual controllers, the complete accurate DG model is considered as an isolated microgrid with the fast inner-loop controllers incorporated. Adopting a common modular inner-loop nonlinear controller form, a rigorous novel stability analysis is developed by constructing the appropriate Lyapunov function in a new sequential manner. Finally, the stability and convergence to the equilibrium are verified by simulation and experimental results.Index Terms-Lyapunov stability, microgrid control, nonlinear dynamic system, stability analysis of distributed generation systems.

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Design and passivity-based stability analysis of a PI current-mode controller for dc/dc boost converters

Cited by 6 publications

References 15 publications

Nonlinear controller design and stability analysis under power management of autonomous PV systems

Nonlinear controller design and stability analysis under power management of autonomous PV systems

Improved MPPT Algorithm for Photovoltaic Systems Based on the Earthquake Optimization Algorithm

Modular Control Design and Stability Analysis of Isolated PV-Source/Battery-Storage Distributed Generation Systems

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