The Experts below are selected from a list of 32619 Experts worldwide ranked by ideXlab platform
Santanu Kapat - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Bus Voltage Reconfiguration in a Two Stage Multi-Phase Converter for Fast Transient
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020Co-Authors: Arnab Acharya, V. Inder Kumar, Santanu KapatAbstract:This paper proposes a dynamic Bus Voltage transition method in a two-stage multi-phase buck converter for 48 V to point-of-load (PoL) applications. The proposed topology uses a bank of pre-charged switching capacitors at the output of the first-stage buck converter. This configuration helps to achieve an immediate intermediate Bus Voltage transition while supplying a (second-stage) multi-phase buck converter. This can substantially speed-up a large-signal transient recovery by adjusting the Bus Voltage to its highest Voltage level. Thereafter, near steady-state, the Bus Voltage is set to its (lower) optimum value for improving the overall efficiency of the two-stage architecture. A higher Bus Voltage can reduce the output capacitance for the second-stage while retaining the (Voltage) undershoot within the desired limit, which can reduce recovery time and current overshoot during a step-reference transient. The first-stage operates in open-loop, while the second-stage uses mixed-signal current mode control using a field programmable gate array (FPGA) device. A hardware prototype of the proposed architecture is made, and improved performance is demonstrated using simulation and experimental results.
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Dynamic Bus Voltage Configuration in a Two-Stage Multi-Phase Buck Converter to Mitigate Transients
2019 IEEE Applied Power Electronics Conference and Exposition (APEC), 2019Co-Authors: Arnab Acharya, V. Inder Kumar, Santanu KapatAbstract:This paper proposes a dynamic Bus Voltage transition technique in a two-stage multi-phase buck converter for 48 V to point-of-load (PoL) applications. The proposed topology uses a bank of pre-charged switching capacitors at the output of the first-stage buck converter. This configuration helps to achieve an immediate intermediate Bus Voltage transition while supplying a (second-stage) multi-phase buck converter. This can substantially speed-up a large-signal transient recovery by adjusting the Bus Voltage to its highest Voltage level. Thereafter, near steady-state, the Bus Voltage is set to its (lower) optimum value for improving the overall efficiency and also for ripple cancellation for the second-stage converter. A higher Bus Voltage helps in proportionally reducing the output capacitance for the second-stage while retaining the (Voltage) undershoot within the desired limit. This helps to reduce recovery time and current overshoot during a step-reference transient. A hardware prototype of the proposed architecture is made, and improved performance is demonstrated using simulation and experimental results.
Arnab Acharya - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Bus Voltage Reconfiguration in a Two Stage Multi-Phase Converter for Fast Transient
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020Co-Authors: Arnab Acharya, V. Inder Kumar, Santanu KapatAbstract:This paper proposes a dynamic Bus Voltage transition method in a two-stage multi-phase buck converter for 48 V to point-of-load (PoL) applications. The proposed topology uses a bank of pre-charged switching capacitors at the output of the first-stage buck converter. This configuration helps to achieve an immediate intermediate Bus Voltage transition while supplying a (second-stage) multi-phase buck converter. This can substantially speed-up a large-signal transient recovery by adjusting the Bus Voltage to its highest Voltage level. Thereafter, near steady-state, the Bus Voltage is set to its (lower) optimum value for improving the overall efficiency of the two-stage architecture. A higher Bus Voltage can reduce the output capacitance for the second-stage while retaining the (Voltage) undershoot within the desired limit, which can reduce recovery time and current overshoot during a step-reference transient. The first-stage operates in open-loop, while the second-stage uses mixed-signal current mode control using a field programmable gate array (FPGA) device. A hardware prototype of the proposed architecture is made, and improved performance is demonstrated using simulation and experimental results.
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Dynamic Bus Voltage Configuration in a Two-Stage Multi-Phase Buck Converter to Mitigate Transients
2019 IEEE Applied Power Electronics Conference and Exposition (APEC), 2019Co-Authors: Arnab Acharya, V. Inder Kumar, Santanu KapatAbstract:This paper proposes a dynamic Bus Voltage transition technique in a two-stage multi-phase buck converter for 48 V to point-of-load (PoL) applications. The proposed topology uses a bank of pre-charged switching capacitors at the output of the first-stage buck converter. This configuration helps to achieve an immediate intermediate Bus Voltage transition while supplying a (second-stage) multi-phase buck converter. This can substantially speed-up a large-signal transient recovery by adjusting the Bus Voltage to its highest Voltage level. Thereafter, near steady-state, the Bus Voltage is set to its (lower) optimum value for improving the overall efficiency and also for ripple cancellation for the second-stage converter. A higher Bus Voltage helps in proportionally reducing the output capacitance for the second-stage while retaining the (Voltage) undershoot within the desired limit. This helps to reduce recovery time and current overshoot during a step-reference transient. A hardware prototype of the proposed architecture is made, and improved performance is demonstrated using simulation and experimental results.
Negareh Ghasemi - One of the best experts on this subject based on the ideXlab platform.
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Virtual Resistor-Based Integrated DC Bus Voltage Conditioner for Stability Improvement of Cascaded Power Converters
IEEE Access, 2019Co-Authors: Jiang You, D. Mahinda Vilathgamuwa, Negareh GhasemiAbstract: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, where a load converter is controlled tightly with high-control bandwidth. In the proposed method, unlike conventional dc Bus Voltage stabilization methods for which auxiliary switches are used, the multiplexing utilization of the full bridge switches at the primary side of a PSFB is adopted. In this paper, to improve the dc Bus Voltage stability, an equivalent virtual resistor is implemented by applying the duty cycle regulation for both legs of the PSFB. The effectiveness of the proposed method on the dc Voltage stabilization is examined through simulations and experiments. The achieved results reveal that the dc Bus Voltage stability is significantly improved with the proposed method.
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DC Bus Voltage stability improvement using disturbance observer feedforward control
Control Engineering Practice, 2018Co-Authors: Jiang You, Mahinda Vilathgamuwa, Negareh GhasemiAbstract:The constant power load (CPL) property of a load converter with tight control results in DC Bus Voltage oscillations in interconnected power converter systems. In this paper, a disturbance observer (DOB) feedforward compensation scheme is proposed to stabilize the DC Bus Voltage of a cascaded power converter. An equivalent DC link Voltage control model and a disturbance observer are used to reconstruct the dynamic changes of the DC Bus current to correct the inner current loop reference of the load converter. Simulation and experimental results show that the proposed method is effective in stabilizing the DC Bus Voltage.
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Analysis and control of integrated DC Bus Voltage conditioner for cascade power converter system
2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia (IFEEC 2017 - ECCE Asia), 2017Co-Authors: Jiang You, Negareh Ghasemi, D. Mahinda Vilathgamuwa, W. L. MalanAbstract:A bidirectional integrated Bus Voltage conditioner (IBVC) is proposed for isolated phase shifted full bridge (PSFB) DC-DC converter to improve the DC Bus Voltage stability in cascaded power converter system. In this method, the load converter is controlled tightly with high control bandwidth. Unlike those separate converter based DC Bus Voltage stabilization methods with auxiliary switches, multiplexing utilization of the existing full bridge switches on the primary side is adopted for the proposed method. In this strategy, phase shift control and duty cycle regulation have been applied for both legs of PSFB. Control-oriented analysis and IBVC parameter design method are also presented. The proposed method is examined through simulation tests and the results are presented.
Praveen Jain - One of the best experts on this subject based on the ideXlab platform.
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A Fast DC-Bus Voltage Controller for Bidirectional Single-Phase AC/DC Converters
IEEE Transactions on Power Electronics, 2015Co-Authors: Majid Pahlevani, Praveen JainAbstract:This paper presents a new dc-Bus Voltage control technique for single-phase bidirectional ac/dc converters. The proposed controller is able to significantly improve the transient response of the dc-Bus Voltage control loop and provide a roBust and reliable closed-loop control system. In the proposed approach, the dc value of the dc-Bus Voltage is precisely estimated through a specific adaptive filter. The structure of the proposed filter provides a very fast and roBust estimation for the dc value of the dc-Bus Voltage. In particular, the proposed dc-extraction technique is able to precisely estimate the dc value in presence of double-frequency ripple mounted on top of the dc-Bus Voltage in single-phase ac/dc converters. Simulation and experimental results demonstrate the superior performance of the proposed closed-loop control system compared to the conventional ones.
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An Adaptive Droop DC-Bus Voltage Controller for a Grid-Connected Voltage Source Inverter With LCL Filter
IEEE Transactions on Power Electronics, 2015Co-Authors: Suzan Eren, Majid Pahlevani, Alireza Bakhshai, Praveen JainAbstract:This paper presents a very fast dc-Bus Voltage controller for a single-phase grid-connected Voltage-source inverter (VSI) with an LCL output filter used in renewable energy applications. In single-phase grid-connected inverters, the design of the dc-Bus Voltage control scheme is very challenging due to the presence of a second harmonic ripple across the dc-Bus Voltage. The proposed dc-Bus Voltage control scheme is able to address the difficulties introduced by the second-harmonic ripple. The dc-Bus Voltage controller is based on an adaptive droop control technique, which is able to provide a very fast transient response for the closed-loop system and ensures the optimal operation of the VSI during steady-state conditions. Also, the simple structure of the controller makes it very practical for grid-connected VSIs used in renewable energy power conditioning systems. Theoretical analysis and experimental results demonstrate the superior performance of the proposed control approach compared to conventional dc-Bus Voltage control schemes.
M. Jahangir Hossain - One of the best experts on this subject based on the ideXlab platform.
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A Fast and RoBust DC-Bus Voltage Control Method for Single-Phase Voltage-Source DC/AC Converters
IEEE Transactions on Power Electronics, 2019Co-Authors: Seyedfoad Taghizadeh, Masoud Karimi-ghartemani, M. Jahangir HossainAbstract:This paper presents a fast and roBust dc-Bus Voltage control method for single-phase grid-connected dc/ac converters. The proposed technique precisely estimates the double-frequency (2-f) ripple of a dc-Bus Voltage and removes it from the Voltage-control loop without adding any additional dynamics or oscillations. Conventionally, the 2-f ripple is managed by using large capacitors, which increase the cost and bulkiness of a converter. As a state-of-the-art approach, a notch filter (NF) or a dc-Voltage estimator is used to effectively block the 2-f ripple from the Voltage-control loop, which can significantly reduce the capacitor size. However, such an approach introduces new dynamics in the control loop, causes additional oscillations on the Bus Voltage, and increases the settling time of its response. This limits the degrees of freedom of the design to improve the overall system damping. The proposed method in this paper has no adverse impact on the original Bus-Voltage dynamic response. As a result, the Bus-Voltage control can be designed with higher speed and roBustness and the whole system can operate with a reduced transient at both the Bus Voltage and the output ac current. The proposed approach is thoroughly analyzed and its effectiveness is validated through simulations and experimental results.
