Reduced-Order Observer-Based Control System for Dual-Active-Bridge DC/DC Converter

Nguyen, Doan Trang; Fujita, Goro; Bui-Dang, Quang; Ta, Minh C.

doi:10.1109/tia.2018.2810805

Cited by 31 publications

(17 citation statements)

References 34 publications

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“…Voltage fluctuation as well as the setting time are reduced by approximately 50% in the presence of a 30% load change compared to that when the feedforward path is not applied. Computation burden of the proposed RPIO is, however, a little bit increased compared to that of the reduced-order observer reported in [20] because of a higher order of the observer model (3 vs. 2). Nevertheless, the expensive current sensor is removed and thus efforts to calibrate that noisy signal are also eliminated and economical benefit is also achieved.…”

Section: Introductionmentioning

confidence: 95%

“…This experiment is conducted to verify the static performance of the proposed observer. Figure 11a,b illustrates the output responses of the proposed observer (RPIO), designed with Q = Q 1 defined above, in comparison with the actual values and with the reduced order observer (ROBS) , which was designed in [20] based on the Terminal 1 current under some different operating conditions. First, Terminal 2 voltage is fixed at its nominal by setting the DC electronic load to constant voltage mode.…”

Section: Open-loop Experimental Verificationmentioning

confidence: 99%

“…In other words, the estimation error is about 5%. Because the error is already small, applying the compensation in Equation (20) does not contribute to a big but minor reduction on the estimation error to 4%. This result is similar to the simulation study described above.…”

Section: Open-loop Experimental Verificationmentioning

confidence: 99%

“…From another aspect, the techniques reported in [20,21] used observers to estimate the active and reactive powers, and then a decoupled current controller was employed to regulate two power components individually. However, the observer proposed in [20] requires the terminal current while that proposed in [21] needs the transmission AC current, as input information. Furthermore, the observer models in [20,21] were established based on some approximations.…”

Section: Introductionmentioning

confidence: 99%

“…However, the observer proposed in [20] requires the terminal current while that proposed in [21] needs the transmission AC current, as input information. Furthermore, the observer models in [20,21] were established based on some approximations. When the voltage ratio is different from unity, the accuracy of those approximations decreases due to the distortion of the current waveform.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 95%

Section: Open-loop Experimental Verificationmentioning

confidence: 99%

Section: Open-loop Experimental Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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Sliding mode and current observer‐based direct power control of dual active bridge converter with constant power load

Tiwary

Panda

et al. 2021

Int Trans Electr Energ Syst

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Summary This article presents a bidirectional isolated DC‐DC dual active bridge (DAB) converter, with an improved control strategy under constant power load (CPL) conditions. Major applications of DAB are in solid‐state transformers (SSTs), energy storage systems, dc‐microgrid, and electric vehicle, where it feeds other converters, which act as a CPLs. CPLs have negative impedance characteristics, thereby, have a destabilizing effect and impact the dynamics and stability of power converters feeding them. Maintaining the dc‐link stability and obtaining a robust control with enhanced dynamic performance is a significant challenge. This paper proposes a sliding mode control method for DAB feeding CPL in its output dc‐link. A sliding mode controller is designed to employ direct power control and maintain a constant output voltage in dc‐link for various loading conditions. Additionally, to remove the output current sensor, an output current observer is proposed for improving the reliability and decreasing the cost. The proposed method improves the transient performance, with robust control over parameter mismatch when CPL is connected to the dc‐link. The transient performance and output voltage regulation with the proposed control technique are simulated with a 3 kW DAB converter in MATLAB/Simulink environment. Furthermore, the same proposed control scheme is validated experimentally with various loading conditions.

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Integral sliding mode based direct power control of isolated DC‐DC converter for improved voltage regulation

Tiwary

Panda

et al. 2022

Circuit Theory & Apps

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This article presents an isolated bidirectional DC‐DC dual active bridge (DAB) converter with an integral sliding mode‐based direct power control (SM‐DPC). Maintaining the dc‐link stability and obtaining a robust control for the converter during sudden load change is a significant challenge. The sliding mode control is well known for its robustness, stability, and tracking performance. The sliding surface based on output voltage error is selected, while the proposed method utilizes the equivalent control approach to generate the power reference for the DAB converter. The direct power control provides an easy control method for the DAB converter as the output voltage depends on the transmitted power, governed by the phase shift angle of two H‐bridges of the converter. The proposed method enhances the steady‐state performance and renders a fast transient response under load change and input voltage variation. Moreover, the method avoids complicated converter modeling and utilizes the voltage dynamic equation and power transfer equation for the controller design. The controller performance and effectiveness are validated with experimental results for a 2‐kW DAB converter.

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Reduced-Order Observer-Based Control System for Dual-Active-Bridge DC/DC Converter

Cited by 31 publications

References 34 publications

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

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

Sliding mode and current observer‐based direct power control of dual active bridge converter with constant power load

Integral sliding mode based direct power control of isolated DC‐DC converter for improved voltage regulation

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