A robust cascaded controller for DC-DC Boost and Cuk converters

Ahmad, Fiaz; Rasool, Akhtar; Özsoy, Emre; Şabanoviç, Asif; Elitaş, Meltem

doi:10.1108/wje-10-2016-0118

Cited by 12 publications

(7 citation statements)

References 16 publications

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“…A relay with hysteresis function is included to generate a control signal 'u' to the converter switch. The generated sliding surface oscillates with the value of 'M' (Ahmed et al, 2016;Chen, 2012). When sliding mode occurs, its existence is checked using Lyapunov function (Mariammal and Deepa, 2019).…”

Section: Control Strategies Of Dc-dc Convertermentioning

confidence: 99%

Performance analysis of boost converter with cascaded inner loop fuzzy SMC

Rekha¹,

Jamuna²,

Christopher³

2021

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Purpose This paper intent to design, develop, and fabricate a robust cascaded controller based on the dual loop concept i.e. Fuzzy Sliding Mode concept in the inner loop and traditional Proportional Integral controller in the outer loop to reduce the unknown dynamics and disturbances that occur in the DC-DC Converter. Design/methodology/approach The proposed Fuzzy sliding mode approach combines the merits of both SMC and Fuzzy logic control. FSMC approach reduces the chattering phenomena that commonly occurs in the sliding mode control and speed up the response of the controller. Findings In most of the research work, the inner current loop of cascaded controller was designed by sliding mode control. In this paper FSMC is proposed and its efficacy is confirmed with SMC -PI. In most uncertainties, FSMC-PI produces null maximum peak overshoot and a very less settling time of 0.0005 sec. Originality/value The presence of Fuzzy SMC in the inner loop ensure satisfactory response against all uncertainties such as steady state, circuit parameter variations and sudden line and load disturbances.

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Section: Control Strategies Of Dc-dc Convertermentioning

confidence: 99%

Performance analysis of boost converter with cascaded inner loop fuzzy SMC

Rekha¹,

Jamuna²,

Christopher³

2021

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“…Disturbance observer (DOB) is widely used to estimate the disturbances in motion control and electrical drive applications (Ohnishi et al , 1996, Ahmad et al , 2017). A DOB-based current controller structure for grid-connected doubly fed induction generators and VSC was first reported by Ozsoy et al (2015, 2016).…”

Section: Introductionmentioning

confidence: 99%

Disturbance-observer based control of voltage-source-converter under unbalanced voltage conditions

Rasool

Özsoy

Ahmad

et al. 2017

WJE

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Purpose This paper aims to propose a novel grid current control strategy for grid-connected voltage source converters (VSCs) under unbalanced grid voltage conditions. Design/methodology/approach A grid voltage dynamic model is represented in symmetrical positive and negative sequence reference frames. A proportional controller structure with a first-order low-pass filter disturbance observer (DOB) is designed for power control in unbalanced voltage conditions. This controller is capable of meeting the positive sequence power requirements, and it also eliminates negative sequence power components which cause double-frequency oscillations on power. The symmetrical components are calculated by using the second-order generalized integrator-based observer, which accurately estimates the symmetrical components. Findings Proportional current controllers are sufficient in this study in a wide range of operating conditions, as DOB accurately estimates and feed-forwards nonlinear terms which may be deteriorated by physical and operating conditions. This is the first reported scheme which estimates the VSC disturbances in terms of symmetrical component decomposition and the DOB concept. Originality/value The proposed method does not require any grid parameter to be known, as it estimates nonlinear terms with a first-order low-pass filter DOB. The proposed control system is implemented on a dSPACE ds1103 digital controller by using a three-phase, three-wire VSC.

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“…A simple external voltage controller can generate input current reference, while equivalent controller controls the input current [29,30]. Although the modified Ćuk converter is a third-order nonlinear model, only an input current equation is required to construct an equivalent controller.…”

Section: Equivalent Control Of Modified ćUk Convertermentioning

confidence: 99%

“…One of the methods that can constrain the sliding surface to constant SF operation can be a dynamic hysteresis controller [35] which dynamically changes the magnitude of sliding surface σ according to the desired switching frequency value. An additional PI controller which intermittently operates to bring As detailed in [25,29,30], Figure 6 shows that a dynamic system can be formed as a series of integrators, and it can be assumed that the output of this system can be estimated by an upper bound of the integral. Finally, a dynamic relay with hysteresis function as given in Figure 7 can be applied to control a signal to generate a sliding surface which oscillates with the magnitude of M. The main disadvantage of the SMC-based equivalent controller is variable switching frequency (SF), because the magnitude of oscillations in sliding surface is highly dependent on circuit parameters and operating conditions due to the nonlinear behavior of the converter.…”

Section: Equivalent Control Of Modified ćUk Convertermentioning

confidence: 99%

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Development of Sliding Mode Controller for a Modified Boost Ćuk Converter Configuration

et al. 2017

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This paper introduces a sliding mode control (SMC)-based equivalent control method to a novel high output gainĆuk converter. An additional inductor and capacitor improves the efficiency and output gain of the classicalĆuk converter. Classical proportional integral (PI) controllers are widely used in direct current to direct current (DC-DC) converters. However, it is a very challenging task to design a single PI controller operating in different loads and disturbances. An SMC-based equivalent control method which achieves a robust operation in a wide operation range is also proposed. Switching frequency is kept constant in appropriate intervals at different loading and disturbance conditions by implementing a dynamic hysteresis control method. Numerical simulations conducted in MATLAB/Simulink confirm the accuracy of analysis of high output gain modifiedĆuk converter. In addition, the proposed equivalent control method is validated in different perturbations to demonstrate robust operation in wide operation range.

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A robust cascaded controller for DC-DC Boost and Cuk converters

Cited by 12 publications

References 16 publications

Performance analysis of boost converter with cascaded inner loop fuzzy SMC

Performance analysis of boost converter with cascaded inner loop fuzzy SMC

Disturbance-observer based control of voltage-source-converter under unbalanced voltage conditions

Development of Sliding Mode Controller for a Modified Boost Ćuk Converter Configuration

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