Virtual Resistor-Based Integrated DC Bus Voltage Conditioner for Stability Improvement of Cascaded Power Converters

You, Jian Wei; Vilathgamuwa, D.M.; Ghasemi, Negareh; Fu, Bin

doi:10.1109/access.2019.2929104

Cited by 10 publications

(5 citation statements)

References 26 publications

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“…As a result of this galvanic isolation, the required protection in renewable energy sources is reduced, and the need for high-voltage switches is eliminated. Therefore, the isolated power electronic DC-DC converters have been widely chosen for high power applications, such as phase-shift full-bridge converters [9]- [11], LCC series-parallel resonant converters [12], [13], bridge converter of single active type [14], [15] and three phase dual active bridge DC-DC converter [16]. The aforementioned converters are constructed by the fullbridge structure for high-power applications.…”

Section: Introductionmentioning

confidence: 99%

A ZVZCS Full-Bridge Converter Suitable for Renewable Energy-Based MVDC Collection System

Waqar Azeem,

Ehab,

Wang

et al. 2024

IEEE Access

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A zero-voltage zero-current-switching (ZVZCS) full-bridge DC-DC converter, based on a dual transformer with two output filter capacitors, is proposed in this paper. The proposed topology is suitable for application in renewable energy at medium voltage, integrated with a DC collection system. To realize voltage and power regulation for the converter, pulse width modulation (PWM) is employed with a fixed duty cycle for the main switches. Through careful design of the turns ratio of the main transformer, most of the power under full load range is delivered by the main full-bridge circuit, which also achieves zero-voltage switching (ZVS). This significantly reduces the switching losses. A small portion of the total power is delivered by the auxiliary circuit that realizes ZVZCS. Therefore, the turns ratio of the auxiliary transformer can be optimized such that the efficiency of the proposed converter can be improved. The optimzation is discussed in detail, along with the design parameters of the proposed converter. A prototype of 200V-2kV/3kW has been developed to verify the simulation results and validate the working of the proposed scheme.

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Section: Introductionmentioning

confidence: 99%

A ZVZCS Full-Bridge Converter Suitable for Renewable Energy-Based MVDC Collection System

Waqar Azeem,

Ehab,

Wang

et al. 2024

IEEE Access

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“…Although the capacitor can be omitted, the cost is higher and the power loss is also increased. To reduce oscillation problems that occur on the dc-link voltage in cascaded converters, dc-link voltage is usually feedback to the control loop to enhance stability and dynamic response of the system [15][16][17]. As the output signal, DC voltage cannot reflect the variation of variables in time due to the phase leg.…”

Section: Introductionmentioning

confidence: 99%

DC‐link capacitor current observation based stability enhancement control for back‐to‐back converter

Jiang

Tian

2022

IET Power Electronics

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This article presents a stability enhancement control scheme applied in the three-phase back-to-back (BTB) converters with L filter. The stability enhancement control scheme is concocted using the feedback of DC-link capacitor current without additional sensors. Both grid-side converters are equipped with this control scheme, which can also be called the coordinated compensation control scheme. In this article, DC terminal impedance models of two converters before and after optimization and stability criterion are introduced. Furthermore, means of impedance analysis, including Bode plot and Nyquist curve, are discussed to categorize the causes of BTB converter instability caused by the increased power. The coordinated scheme is compared with the conventional scheme for revealing the theoretical basis. The proposed method is capable of optimizing the disturbance suppression capability of DC-link voltage, which would potentially reduce capacitor volume and physical size of the DC-link. The impedance-based stability analysis indicates that the controllability and stability of the BTB converter is enhanced with the proposed DClink capacitor current coordinated control. Furthermore, the proposed control scheme is implemented in the MATLAB/Simulink environment. Moreover, for further validation, the feasibility of the coordinated control scheme is verified with the experimental results.

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“…Then, two novel approaches have been proposed to improve the superimposed frequency droop scheme for the control of dc microgrids in [25]. In [26], A bidirectional integrated bus voltage conditioner (IBVC) for an isolated phase-shifted full bridge (PSFB) DC-DC converter is proposed to reduce the DC bus voltage oscillations in a cascaded power converter system. Meanwhile, a hybrid switching modulation is proposed to improve the power conversion efficiency of the CF-IBDC under light and heavy load conditions in [27].…”

Section: Introductionmentioning

confidence: 99%

DC Bus Voltage Influence and Stabilization Technology Under Servo Loading for Aerospace Combined Power Supply

et al. 2022

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In order to obtain high specific power, high specific capacity and highly reliable power supply, a combined power supply system is often used. As one of the main loads to the combined power supply system, the servo system can adjust the trajectory and attitude of the aerospace vehicles in real-time. However, a sudden change of the load to the servo system can have adverse effects on the DC bus voltage output, which will reduce the performance of the electrical equipment on the aerospace vehicles. Firstly, this paper theoretically deduces and analyzes the influence of servo loading conditions on the DC bus voltage of aerospace combined power supply. Secondly, in the field of aerospace combined power system, the mechanism of regulating DC bus voltage by combining bidirectional DC-DC converter and ultracapacitor is proposed, and its effectiveness and enforceability are verified by simulation and experiment. Finally, aiming at the strong nonlinear and time-varying characteristics of bidirectional DC-DC converter, a fuzzy predictive control algorithm which can effectively adjust the DC bus voltage is proposed, and a good regulation control effect is achieved.INDEX TERMS Aerospace combined power supply system, bidirectional DC-DC converter, DC bus voltage stabilization technology, fuzzy predictive control, Kalman filtering.

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Virtual Resistor-Based Integrated DC Bus Voltage Conditioner for Stability Improvement of Cascaded Power Converters

Cited by 10 publications

References 26 publications

A ZVZCS Full-Bridge Converter Suitable for Renewable Energy-Based MVDC Collection System

A ZVZCS Full-Bridge Converter Suitable for Renewable Energy-Based MVDC Collection System

DC‐link capacitor current observation based stability enhancement control for back‐to‐back converter

DC Bus Voltage Influence and Stabilization Technology Under Servo Loading for Aerospace Combined Power Supply

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