Discrete-Time Repetitive Control of Flyback CCM Inverter for PV Power Applications

Lee, Sungho; Cha, Woo-Jun; Kwon, Bong-Hwan; Kim, Min Soo

doi:10.1109/tie.2015.2477484

Cited by 59 publications

(18 citation statements)

References 18 publications

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“…= 0 shows that the harmonic component is equal to zero only for δ = 0 and δ = 1, therefore that harmonic component has the same sign in the range of interest 0 ≤ δ ≤ 1, i.e., always positive or always negative. The extremum value of the harmonic component occurs at δ = 0.5 as reported in (27), which is a maximum since the second derivative of the harmonic component is negative at δ = 0.5, this is confirmed in (28).…”

Section: Range Of Operation For the Phase Shift δsupporting

confidence: 65%

“…The main drawback of those solutions is the use of several inductors and capacitors, which reduce both power density and efficiency. Other approach consist of using converters with galvanic isolation [14,16,[23][24][25][26][27][28], where the main concerns are the voltage and current stress on the power devices and soft switching capability, but for a well-designed isolated converter, high efficiency and voltage-conversion-ratio are achievable with low stress on the switching devices [29].…”

Section: Introductionmentioning

confidence: 99%

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Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

et al. 2020

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In this paper, a design method for a photovoltaic system based on a dual active bridge converter and a photovoltaic module is proposed. The method is supported by analytical results and theoretical predictions, which are confirmed with circuital simulations. The analytical development, the theoretical predictions, and the validation through circuital simulations, are the main contributions of the paper. The dual active bridge converter is selected due to its high efficiency, high input and output voltages range, and high voltage-conversion ratio, which enables the interface of low-voltage photovoltaic modules with a high-voltage dc bus, such as the input of a micro-inverter. To propose the design method, the circuital analysis of the dual active bridge converter is performed to describe the general waveforms derived from the circuit behavior. Then, the analysis of the dual active bridge converter, interacting with a photovoltaic module driven by a maximum power point tracking algorithm, is used to establish the mathematical expressions for the leakage inductor current, the photovoltaic current, and the range of operation for the phase shift. The design method also provides analytical equations for both the high-frequency transformer equivalent leakage inductor and the photovoltaic side capacitor. The design method is validated through detailed circuital simulations of the whole photovoltaic system, which confirm that the maximum power of the photovoltaic module can be extracted with a correct design of the dual active bridge converter. Also, the theoretical restrictions of the photovoltaic system, such as the photovoltaic voltage and power ripples, are fulfilled with errors lower than 2% with respect to the circuital simulations. Finally, the simulation results also demonstrate that the maximum power point for different environmental conditions is reached, optimizing the phase shift factor with a maximum power point tracking algorithm.

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Section: Range Of Operation For the Phase Shift δsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

et al. 2020

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“…Remark It should be mentioned that, in this paper, a new robust EID estimator–based repetitive control design for a class of linear switched stochastic systems with time delay and disturbance has been proposed. The authors in Lee and Zhao proposed a repetitive control design for continuous conduction mode and grid connected inverter systems, respectively, which can effectively track the periodic reference signals and reject the periodic disturbances. It is noting that if a control system is affected by aperiodic disturbances, the controller proposed in Lee and Zhao does not invoke properly.…”

Section: Resultsmentioning

confidence: 99%

“…Because of its eminent properties such as easy execution and high control precision, RC has been widely applied for various practical systems such as single-phase bidirectional rectifier, flyback continuous conduction mode inverter, grid-connected inverter, and robotic manipulators. [34][35][36][37] Repetitive controller with high-precision tracking property is due to a periodic signal generator implemented in the repetitive controller. Moreover, RC involves 2 types of independent actions: the continuous control process within 1 period and the discrete learning behavior between periods.…”

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confidence: 99%

Observer‐based tracking control for switched stochastic systems based on a hybrid 2‐D model

Sakthivel

Karimi

et al. 2017

Intl J Robust & Nonlinear

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Summary This paper is concerned with the observer‐based output tracking problem for a class of linear switched stochastic systems with time delay and disturbance by using repetitive control approach. More precisely, a two‐dimensional hybrid model is incorporated to obtain and optimize the repetitive controller. In particular, the repetitive controller is used to improve the tracking performance through its continuous learning actions. In addition, an equivalent‐input‐disturbance estimator is incorporated into the repetitive control design approach to reduce the effect of the external disturbances. The main aim of the control design is to track the periodic reference signal with the measured output of the system under consideration even in the presence of an unknown bounded disturbance. By constructing a suitable Lyapunov‐Krasovskii functional and using average dwell time approach and Jensen inequality, sufficient conditions are obtained in terms of linear matrix inequalities to guarantee the mean‐square exponential stability of the considered system. Eventually, a numerical example is provided to demonstrate the effectiveness of the developed method.

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“…The converter can operate in either Continuous Conduction Mode (CCM) or Discontinuous Conduction Mode (DCM), which have different advantages and suit various applications. When the power level is relatively high, flyback converters operating in CCM can achieve higher efficiencies and lower voltage stress than that operating in DCM [4,5]. But this requires high magnetizing inductance and large-size transformer.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Sensorless Charge Balance Controller Based on a Damped Current Model for Flyback Converter Operating in DCM

et al. 2018

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This paper presents an Optimized Sensorless Charge Balance (OSCB) controller based on a damped current model for flyback converter operating in Discontinuous Conduction Mode (DCM). By solving total differential equations of non-ideal transformer currents, the damped current model is derived with consideration of parasitics, leakage inductance of transformer, and the Resistor-Capacitor-Diode (RCD) snubber circuit. Based on the proposed model, current observation and control algorithms of the Sensorless Charge Balance (SCB) controller are optimized, which forms the OSCB control strategy. The average current damping is considered in the equivalent discrete-time small signal model. Furthermore, frequency analyses show that OSCB controller achieves higher closed-loop bandwidth and lower overshoot than a SCB controller, which indicates an improved transient performance. Finally, both OSCB and conventional SCB controllers are experimentally evaluated on a flyback converter prototype.

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Discrete-Time Repetitive Control of Flyback CCM Inverter for PV Power Applications

Cited by 59 publications

References 18 publications

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

Observer‐based tracking control for switched stochastic systems based on a hybrid 2‐D model

An Optimized Sensorless Charge Balance Controller Based on a Damped Current Model for Flyback Converter Operating in DCM

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