Self‐tuning indirect adaptive control of non‐inverting buck–boost converter

Hajizadeh, Amin; Shahirinia, Amir; Namjoo, Navid; Yu, David C.

doi:10.1049/iet-pel.2014.0492

Cited by 15 publications

(5 citation statements)

References 26 publications

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“…The semiconductor losses of the topology A are computed at two operating points of 640kW and 1MW when it generates dc voltage of 12kV, in which each sub-converter contributes 4kV. The dc output voltage of 12kV (4kV per subconverter) is selected to ensure that the switching devices' utilizations in topology A remain the same as that of the topology C. In this way, the same expressions for the turn-on and turn-off energies in (25) and (26) can be used for calculations of switching losses of topology A. The results in Table 5 and Table 6 show that the topology A exhibits the lowest semiconductor losses (highest efficiencies) when it operates in DCM, while it shows marginally the highest semiconductor losses (lowest efficiencies) when it operates in CCM.…”

Section: Approximate Semiconductor Loss Estimatesmentioning

confidence: 99%

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High-power medium-voltage three-phase ac–dc buck–boost converter for wind energy conversion systems

Alsokhiry

Abdelsalam

Adam

et al. 2019

Electric Power Systems Research

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This paper proposes three topologies of single-stage three-phase ac-dc buck-boost converters suitable for medium-voltage and high-power wind energy conversion systems (WECS). The proposed converters draw sinusoidal input currents with nearly unity power factor from wind generators over wide range of ac voltages and frequencies. The proposed converters reduce the voltage and current stresses on the self-commutated switching device compared to existing solutions; thus, promising for new generation of relatively cheap WECSs. The proposed converters operate in Discontinuous Condition Mode (DCM), with their ac terminals connected to three-phase generator with open ended windings, or to ac supply using three single-phase transformers with isolated windings at converter side. The validity of the proposed converters and its detailed theoretical analysis and discussions are confirmed using PSCAD/EMTDC simulations, and further corroborated by experimentations, considering different operating conditions. Nomenclature δ: Duty cycle. δc: Critical duty cycle ωg: Generator speed ωopt: Optimal speed CCM: Continuous conduction mode DCM: Dissentious conduction modes DBD1 to DBD3 : Sub-converter blocking diodes DFW1 to DFW3 : Sub-converter freewheeling diodes fs : Switching frequency f : Supply fundamental frequency Ic : dc-link capacitor current Ic_avr : Average dc-side capacitor current Ip : Peak fundamental supply current I * p : Reference peak fundamental supply current Ldc1 to Ldc3 : dc-link inductances Ldc_slc :Selected dc-link inductance for given circuit operation ILa, ILb , and ILc : dc-link inductance current ILmax_a, ILmax_b, and ILmax_c : Peak dc inductor currents is1 to is6 : Currents in the switches of the sub-converters ira ,irb ,and irc : Fundamental component of the pre-filter input current ir_rms : Pre-filter input root mean square current MPPT :Maximum power point tracking PI : Proportional integral R : Load resistance txa, txb and txc Deplete times of the energy stored in the dc-link inductors Ts : Switching period Vdc : dc link voltage Vm : Peak of phase voltage vs(a),vs(b), and vs(c) : Three-phase supply voltages WECS : Wind energy conversion system ZCS : Zero current switching

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Section: Approximate Semiconductor Loss Estimatesmentioning

confidence: 99%

“…In [23][24][25][26][27][28][29][30], several ac-dc converters that offer buck-boost capability in a single stage have been proposed. The singlestage ac-dc buck-boost converter presented in [23] is attractive due to simplicity of its power circuit, which consists of a threephase diode rectifier and conventional buck-boost converter.…”

Section: Introductionmentioning

confidence: 99%

High-power medium-voltage three-phase ac–dc buck–boost converter for wind energy conversion systems

Alsokhiry

Abdelsalam

Adam

et al. 2019

Electric Power Systems Research

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“…However, the aforementioned research efforts fall short of introducing systematic design procedures for the practical implementation of feedback linearization control law. Other research endeavors have proposed full-state feedback control via a pole placement technique [14][15][16][17][18]. In contrast to the classical voltage-mode controllers, all the state variables of the power converter are fed back through constant gains.…”

Section: Introductionmentioning

confidence: 99%

“…However, the steady-state error elimination has not been discussed. Other methods, such as a power smoothing control using sliding-mode control, a pole placement criterion [17], and a minimum degree pole placement-based digital adaptive control [18], have been proposed for power converters. State feedback with integral control of a PWM push-pull dc-dc power converter has also been reported in [19].…”

Section: Introductionmentioning

confidence: 99%

State Feedback with Integral Control Circuit Design of DC-DC Buck-Boost Converter

2023

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The pulse-with modulated (PWM) dc-dc buck-boost converter is a non-minimum phase system, which requires a proper control scheme to improve the transient response and provide constant output voltage during line and load variations. The pole placement technique has been proposed in the literature to control this type of power converter and achieve the desired response. However, the systematic design procedure of such control law using a low-cost electronic circuit has not been discussed. In this paper, the pole placement via state-feedback with an integral control scheme of inverting the PWM dc-dc buck-boost converter is introduced. The control law is developed based on the linearized power converter model in continuous conduction mode. A detailed design procedure is given to represent the control equation using a simple electronic circuit that is suitable for low-cost commercial applications. The mathematical model of the closed-loop power converter circuit is built and simulated using SIMULINK and Simscape Electrical in MATLAB. The closed-loop dc-dc buck-boost converter is tested under various operating conditions. It is confirmed that the proposed control scheme improves the power converter dynamics, tracks the reference signal, and maintains regulated output voltage during abrupt changes in input voltage and load current. The simulation results show that the line variation of 5 V and load variation of 2 A around the nominal operating point are rejected with a maximum percentage overshoot of 3.5% and a settling time of 5.5 ms.

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“…An adaptive law based on sliding mode control was proposed and validated for DC-DC converters in [10], while the work in [11] presented an indirect sliding mode control for a quadratic boost converter in DCM and CCM. Thew work in [12] discussed a self-tuning adaptive controller for a non-inverting buck-boost converter based on parameter estimation using recursive least squares (RLS). A zero-voltage switching technique was employed for a buck converter at the DCM/CCM boundary in [1] and was shown to have increased efficiency.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Control of Four-Quadrant DC-DC Converters in Both Discontinuous and Continuous Conduction Modes

et al. 2020

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The inherently different dynamics of a DC-DC converter while operating in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) necessitate an advanced controller to control the inductor current. A conventional PI controller cannot be used across both modes since it does not guarantee a smooth transition between both modes. Furthermore, in time-varying input-output voltage applications of the four-quadrant converter such as in battery charging applications, the location of the boundary between the CCM and the DCM changes dynamically, creating an uncertainty. Therefore, a robust controller is required to accurately track the inductor current in the presence of uncertainties. Thus, an adaptive controller is proposed in this work, which is based on the general inverse model of the four-quadrant converter in both modes. Moreover, gain scheduling is used to switch the parameters of the controller as the converter transits between the DCM and the CCM. The adaptability and effectiveness of the controller in ensuring a smooth transition is validated by numerical simulations conducted on various converter topologies. Experimental results are also presented for a buck converter.

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Self‐tuning indirect adaptive control of non‐inverting buck–boost converter

Cited by 15 publications

References 26 publications

High-power medium-voltage three-phase ac–dc buck–boost converter for wind energy conversion systems

High-power medium-voltage three-phase ac–dc buck–boost converter for wind energy conversion systems

State Feedback with Integral Control Circuit Design of DC-DC Buck-Boost Converter

Adaptive Control of Four-Quadrant DC-DC Converters in Both Discontinuous and Continuous Conduction Modes

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