Digital Current Sensorless Control of Current-Driven Full-Bridge DC/DC Converters

Pahlevani, Majid; Eren, Suzan; Pahlevaninezhad, Hamid; Askarian, Iman; Bagawade, Snehal

doi:10.1109/tpel.2017.2688479

Cited by 20 publications

(3 citation statements)

References 48 publications

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“…In the DC distribution network, the grid connection of different voltage levels and the access power of the renewable energy power generation system can be realized by using DC transformers [31]. Figure 1 shows a typical DC distribution network structure diagram.…”

Section: Working Process Analyzing and Improvement Of Circuit Topologymentioning

confidence: 99%

Research on fault current limitation and active control for power electronic transformer in direct current grid

Zhuo

Zhang

et al. 2020

IET Generation Trans & Dist

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Due to the low impedance of DC (Direct Current) power transmission line, short‐circuit current has a very high increment speed, which causes problems as difficulty in current limitation method. This paper proposes a new method to realize the current‐limiting control of short‐circuit current by using active control of power electronic transformer. The method improves the topology of dual active bridge modules that contribute the DC transformer, and installs an IGBT (Insulated Gate Bipolar Transistor) switch in reverse direction on supporting capacitor branch of each module to control the capacitor on or off, which can guarantee the storage energy within the capacitor will not release in initial stage in case of DC short circuit fault happen. Therefore, there is no large inrush current flow out. Furthermore, combined with the requirements of current tracking control during low‐voltage ride‐through, the transformer output current under short‐circuit condition is actively controlled in order to meet the needs of renewable energy power generation equipment. Finally, the simulation and hardware‐in‐the‐loop experiments verify the correctness of this method.

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Section: Working Process Analyzing and Improvement Of Circuit Topologymentioning

confidence: 99%

Research on fault current limitation and active control for power electronic transformer in direct current grid

Zhuo

Zhang

et al. 2020

IET Generation Trans & Dist

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“…For stand‐alone PV application with storage, a battery current measurement is also needed, especially during the process of battery charging and discharging to guarantee higher performance , hence, the importance of considering the PV current control in parallel with the MPPT and PV voltage. In addition, and so as to reduce the cost related to current and voltage sensors , an observer‐based PV control technique applied on a DC–DC converter is proposed in this paper, and the proposed controller can deal with both voltage and current regulation of the PV system without PV current measurement.…”

Section: Introductionmentioning

confidence: 99%

Observer‐based control of a photovoltaic DC–DC buck converter: HDS approach

Dali

Diaf

Tadjine

2019

Asian Journal of Control

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In this paper, a new observer-based controller is proposed for a photovoltaic DC-DC buck converter; both photovoltaic (PV) voltage and current regulation are considered. In order to deal with the complex and nonlinear PV mathematical model and adapt it to the control purpose, a hybrid PV current observer model is proposed; three modes are defined and the stability of the observer is discussed using the hybrid dynamical system approach (HDS). The observer-based controller is designed for both voltage and current regulation of the PV system; the closed loop of the full system stability is demonstrated through Lyapunov analysis. Experimental results are also presented showing the feasibility of the proposed observer-based controller.

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“…In fact, the sensorless current control technique has been popularly applied for unidirectional DC/DC converters [13][14][15]. Recently, it is also applied for controlling DAB converters [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Sensorless Control of Dual-Active-Bridge Converter with Reduced-Order Proportional-Integral Observer

et al. 2018

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When controlling a Dual-Active-Bridge (DAB) DC/DC converter, the high frequency terminal current is usually measured for use in the current feedback controller. In order to measure that current, a wide bandwidth sensor accompanied with high-speed amplifiers are required. Furthermore, a high Analog-to-Digital sampling rate is also necessary for sampling and processing the measured data. To avoid those expensive requirements, this paper proposes an alternative control method for the DAB converter. In the proposed method, the terminal current is estimated by a reduced-order proportional integral observer. A technique is also proposed to reduce the phase drift effect when the voltages at two terminals are not matched. Afterwards, a combined current feedforward-voltage feedback control system is developed to enhance the system dynamics and to regulate the output voltage. This control system needs only the information of the terminal voltages and no current sensor is required. Experimental results show that the observer can estimate the terminal current very quickly with the accuracy of more than 98%. In addition, the output voltage is well regulated with a fluctuation of less than ±2.6% and a settling time of less than 6.5 ms in the presence of a 30% load change.

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Digital Current Sensorless Control of Current-Driven Full-Bridge DC/DC Converters

Cited by 20 publications

References 48 publications

Research on fault current limitation and active control for power electronic transformer in direct current grid

Research on fault current limitation and active control for power electronic transformer in direct current grid

Observer‐based control of a photovoltaic DC–DC buck converter: HDS approach

Sensorless Control of Dual-Active-Bridge Converter with Reduced-Order Proportional-Integral Observer

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