Characterization of Steady-State Current Ripple in Interleaved Power Converters Under Inductance Mismatches

Antoszczuk, Pablo; Retegui, Rogelio García; Wassinger, Nicolas; Maestri, Sebastian; Funes, Marcos; Benedetti, Mario

doi:10.1109/tpel.2013.2270005

Cited by 33 publications

(11 citation statements)

References 24 publications

(21 reference statements)

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“…For interleaved converters, each phase can control its current individually and the sawtooth-shaped carriers used for the generation of the PWM can be phase-shifted to obtain an interleaved total converter current i con . For optimum interleaving, a phase-shifting controller can be added and various methods that account for imbalances between the phases can be used [16], [29], [30]. The phase-shifting controller is not further discussed, as it is irrelevant for the present study.…”

Section: A Pi Controller With a Single Update Per Switching Periodmentioning

confidence: 99%

Evaluation of Current Control Structures for Multi-Phase Interleaved DC-DC Converters

2021

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Several current control concepts for non-isolated interleaved DC-DC converters are systematically evaluated in terms of their dynamic and steady state performance, based on defined performance evaluation indicators. Various current control structures suitable for multi-phase interleaved systems are studied: i) a conventional PI controller with a single update per switching period, ii) a PI controller with a fast execution rate, equal to the sampling frequency instead of the switching frequency iii) a LQR-based state feedback controller (SFC), iv) a model predictive controller (MPC), and v) an adaptive hybrid controller that consists of a hysteretic controller during transient and a PI controller during steady state. Each of these control structures is optimized based on the same multi-objective optimization routine and a defined cost function. After the optimal controller design for each control structure is identified, the optimized designs are compared to identify the advantages and disadvantages of each structure. Additionally, a high current prototype current source based on a multi-phase interleaved converter with 6 interleaved modules switching at 60kHz is used to verify the most promising control structures, the developed models, and the results presented in this paper. Among the different studied structures, the adaptive hybrid controller is shown to exhibit the best performance to step transients and the MPC shows great potential following arbitrary waveforms, but also striking shortcomings in the presence of measurement noise.INDEX TERMS Current control, interleaved converter, optimal control, multi-objective optimization, high dynamic performance, high power DC-DC converters.

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Section: A Pi Controller With a Single Update Per Switching Periodmentioning

confidence: 99%

Evaluation of Current Control Structures for Multi-Phase Interleaved DC-DC Converters

2021

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“…This type of circuits are formed by two switches and inductances in the same phase of different converters, the dc bus voltage is the only electromotive force contained in the circuits. In contrast, the nonzero-sequence circulating current paths, for instance, O-A-L a1 -S11-P-N-S62-L b2 -B-O,O-A-L a2 -S12-P-N-S61-L b1 -B-O,O-B-L b2 -S32-P-N-S41-L a1 -A-O,O-B-L b1 -S31-P-N-S42-L a2 -A-O contain two more ac phase voltages. Generally, in practical applications, while modular converters are usually designed to have equal values of parameters, tolerance in parameter dispersion is very common, especially in the line inductance [27], [28]. As a consequence, the values of three phase filter inductance are not strictly equal, which will lead to asynchronous actions in switches, and consequently, circulating currents will be generated.…”

Section: Model Of Parallel Three Phase Converters Unbalanced Opermentioning

confidence: 99%

Control of Parallel Three-Phase PWM Converters Under Generalized Unbalanced Operating Conditions

Zhang

Xiao

et al. 2017

IEEE Trans. Power Electron.

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This paper proposes a new control scheme for parallel three phase pulse width modulation (PWM) converters under generalized unbalanced operating conditions. An average model of the parallel system in positive-sequence synchronous reference frame (PSRF) is derived to analyze the influence of generalized unbalanced operating conditions in AC side. It is seen that the unbalance factors in filter inductance will not only give rise to negative-sequence circulating current, but also contribute to generating zero-sequence circulating current(ZSCC). The negative-sequence circulating current can be inhibited by suppressing the negative-sequence components in AC output currents of parallel modules with a proportional integral resonant (PIR) controller. An improved feed-forward strategy and a PIR controller for ZSCC control are proposed for unbalanced operating conditions. The disturbances in ZSCC caused by unbalance factors in filter inductance can be rejected with feed-forward strategy. Because the disturbance in ZSCC is the fluctuation in grid frequency which can be suppressed by resonance controller, so a PIR controller is adopted in ZSCC controller. The proposed scheme can effectively suppress the circulating currents between the parallel modules and as a result, the distortions in output currents can be greatly reduced. Experimental results confirm the performance and effectiveness of the proposed method.

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“…In recent years, interleaved DC-DC converters have been widely used in household appliances, industrial equipment, and national defense construction, among others [1,2]. Interleaved DC-DC converters can effectively reduce the amplitude of the total current ripple, increase the ripple frequency of the output current, and improve the ability to control high currents [3][4][5][6][7]. Within DC-DC converters, the power switch works at very high switching frequencies.…”

Section: Introductionmentioning

confidence: 99%

A Fast and Simple Fault Diagnosis Method for Interleaved DC-DC Converters Based on Output Voltage Analysis

Zeng

2021

Electronics

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Interleaved DC-DC converters have been widely used in power conversion due to their high efficiency and reliability. In the application of new energy, this plays an increasingly important role in the grid-connected power generation of wind, solar, and tidal energy. Therefore, it is crucial to ensure the reliability and proper operation of interleaved DC-DC converters. We studied an open circuit fault (OCF) diagnosis method for a three-phase interleaved buck converter. We propose a non-invasive diagnosis method based on the output voltage using the harmonic amplitude and phase at the switching frequency as the diagnostic criteria. Evaluation was carried out on a hardware-in-the-loop (HIL) test platform to prove the validity of the proposed method. The results show that the presented method had high accuracy and robustness against OCFs, which could otherwise damage the system.

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Characterization of Steady-State Current Ripple in Interleaved Power Converters Under Inductance Mismatches

Cited by 33 publications

References 24 publications

Evaluation of Current Control Structures for Multi-Phase Interleaved DC-DC Converters

Evaluation of Current Control Structures for Multi-Phase Interleaved DC-DC Converters

Control of Parallel Three-Phase PWM Converters Under Generalized Unbalanced Operating Conditions

A Fast and Simple Fault Diagnosis Method for Interleaved DC-DC Converters Based on Output Voltage Analysis

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