Modeling and Nonlinear Control of dc–dc Converters for Microgrid Applications

Solsona, J.; Jorge, Sebastián Gómez; Busada, Claudio A.

doi:10.3390/su142416889

Cited by 7 publications

(7 citation statements)

References 52 publications

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“…It is more appropriate because of its higher phase boost compared to the type II compensator, which is needed at higher crossover frequencies. With a higher crossover frequency, the converter will respond faster to load changes [30]. It is possible to achieve a high crossover frequency with analog control and this type of controller [31].…”

Section: Design Of Analog Output Voltage Controllermentioning

confidence: 99%

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Response Time Reduction of DC–DC Converter in Voltage Mode with Application of GaN Transistors and Digital Control

Kroičs,

Gaspersons,

Elkhateb

2024

Electronics

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This paper discusses the potential to decrease the response time of a DC–DC converter through the substitution of Si transistors with GaN transistors and the implementation of digital control techniques. This paper introduces an improved methodology for designing digital voltage controllers by analyzing discretization delays and subsequently implementing a modified analog controller design method. The theoretical analysis was verified using an experimental prototype of a 100 W 48 V to 12 V GaN-based DC–DC converter. A digital controller that allows a 50 kHz bandwidth to be achieved based on an STM32G4 microcontroller was developed, and the design of the controller is discussed in detail. The converter was operated with a 500 kHz switching frequency using a 6 µH inductor and a 20 µF ceramic capacitor output filter. Although the digital control introduced a 1.2 µs delay, a converter response time equal to 40 µs was achieved. Simulation models were created and their results were verified via comparisons with experimental results obtained with an AP310 frequency response analyzer.

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Section: Design Of Analog Output Voltage Controllermentioning

confidence: 99%

“…The resolution can be increased with oversampling, but that would slow down the ADC. The gain added by the ADC can be calculated using Equation (30) [39], and its resolution can be calculated using Equation (31).…”

Section: Design Of Digital Controllermentioning

confidence: 99%

Response Time Reduction of DC–DC Converter in Voltage Mode with Application of GaN Transistors and Digital Control

Kroičs,

Gaspersons,

Elkhateb

2024

Electronics

View full text Add to dashboard Cite

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“…Since the inverter does not have constant output power, DC bus voltage persists with low frequency voltage ripple. Due to these voltage ripples, low frequency current ripples are generated in the PEMFC's output if no proper voltage controller is implemented for the converter [13]. Thus, it is necessary to implement an effective voltage control mechanism to reduce the voltage ripple.…”

Section: Control Of the Proposed Dc-dc Convertermentioning

confidence: 99%

“…The proper operation and reliability of the PEMFC integrated into the microgrid can be negatively impacted by these limitations. Advanced high voltage gain DC-DC converters thus offer the best solution for these issues [13].…”

Section: Introductionmentioning

confidence: 99%

A High Voltage Gain Interleaved DC-DC Converter Integrated Fuel Cell for Power Quality Enhancement of Microgrid

et al. 2023

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Fuel cells have drawn a lot of interest in recent years as one of the most promising alternative green power sources in microgrid systems. The operating conditions and the integrated components greatly impact the quality of the fuel cell’s voltage. Energy management techniques are required in this regard to regulate the fuel cell’s power in a microgrid. The active/reactive power in the microgrid should be adjusted in line with US Energy Star’s regulations whereas the grid current needs to follow the standard set by IEEE 519 2014 to enhance the power quality of the electrical energy injected into the microgrid. Uncontrolled energy injection from the fuel cell can have serious impacts including superfluous energy demand, overloading, and power losses, especially in high power and medium voltage systems. Although fuel cells have many advantages, they cannot yet produce high voltages individually to compensate for the demand of a microgrid system. Due to these reasons, the fuel cell must be interfaced with a DC-DC converter. This research proposes a novel high voltage gain converter integrated 1.26 kW fuel cell for microgrid power management that can boost the fuel cell’s voltage up to 20 times. Due to this high voltage gain, the voltage and current ripple of the fuel cell is also reduced substantially. According to the analysis, the proposed converter demonstrated optimal performance when compared to the other converters due to its high voltage gain and extremely low voltage ripple. As a result, the harmonic profile of the microgrid current persists with a reduced THD of 3.22% and a very low voltage ripple of 4 V. To validate the converter’s performance, along with extensive simulation, a hardware prototype was also built. The voltage of the fuel cell is regulated using a simplified proportional integral controller. The operating principle of the converter integrated fuel cell along with its application in microgrid power management is demonstrated. A comparative analysis is also shown to verify how the proposed converter is improving the system’s performance when compared against other converters.

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“…Feedback linearization methods have been discussed in [9][10][11][12][13] for dc-dc power converters. A feedback control law based on full feedback linearization has been introduced for the buck, boost, and buck-boost converters [9].…”

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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Modeling and Nonlinear Control of dc–dc Converters for Microgrid Applications

Cited by 7 publications

References 52 publications

Response Time Reduction of DC–DC Converter in Voltage Mode with Application of GaN Transistors and Digital Control

Response Time Reduction of DC–DC Converter in Voltage Mode with Application of GaN Transistors and Digital Control

A High Voltage Gain Interleaved DC-DC Converter Integrated Fuel Cell for Power Quality Enhancement of Microgrid

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

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