The Experts below are selected from a list of 1744212 Experts worldwide ranked by ideXlab platform
Masoud Karimi-ghartemani - 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.
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Indirect voltage control Method for single phase DC/AC converters
2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014, 2014Co-Authors: Masoud Karimi-ghartemaniAbstract:A controller for single phase DC/AC converters is proposed that is analogous with the droop control Method used in synchronous generator technology. Its approach is different from the existing droop techniques adopted for power electronic inverters where consistently the output voltage is controlled through an explicit voltage control loop. The proposed Method indirectly controls the output voltage of the inverter by controlling its immediate (or internal) voltage. Therefore, when operating in parallel with other inverters, it can offer a more robust and stable operation by avoiding direct competition of the inverters. This paper presents the derivations and numerical results of the proposed controller.
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.
Hideaki Fujita - One of the best experts on this subject based on the ideXlab platform.
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A DC Capacitor Voltage Control Method for Active Power Filters Using Modified Reference Including the Theoretically Derived Voltage Ripple
IEEE Transactions on Industry Applications, 2016Co-Authors: Tomoyuki Mannen, Hideaki FujitaAbstract:This paper proposes a new dc capacitor voltage control Method suitable for active power filters equipped with a small dc capacitor. The proposed control Method calculates the theoretical dc capacitor voltage ripple and provides it to the dc capacitor voltage feedback controller as the reference. As a result, the proposed Method has the capability to regulate the mean value of the dc capacitor voltage under a large voltage ripple condition. The proposed Method also allows us to use a high feedback gain for suppressing the capacitor voltage fluctuations without any performance deterioration in the harmonic compensation. Experimental results confirm a good harmonic compensation and an effective voltage regulation performance under a small dc capacitor condition. The results also demonstrate a significant improvement in the capacitor voltage regulation even when a sudden load change occurs.
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A DC capacitor voltage control Method for active power filters using modified reference including the voltage ripple derived from a theoretical analysis
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015Co-Authors: Tomoyuki Mannen, Hideaki FujitaAbstract:This paper proposes a new dc capacitor voltage control Method suitable for active power filters equipped with a small dc capacitor. The proposed control Method calculates the theoretical energy stored in the dc capacitor and provides it to the dc capacitor voltage feedback controller as its energy reference. As a result, the proposed Method has capability to regulate the mean value of the dc capacitor voltage without any degradation in harmonic compensation even when a small dc capacitor and a high feedback gain are applied. Furthermore, application of a high feedback gain to the proposed Method makes it possible to suppress the capacitor voltage fluctuations effectively without any performance deterioration in the harmonic compensation. Experimental results confirm a good harmonic compensating performance when applying a high-gain feedback controller to an active power filter with a small dc capacitor. The results also demonstrate a significant improvement in the capacitor voltage regulation even when a sudden load change occurs.
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Study of a DC voltage equalizing circuit and a zero‐sequence voltage control Method for a diode‐clamped linear amplifier
Electrical Engineering in Japan, 2012Co-Authors: Naoya Yamashita, Hideaki FujitaAbstract:2,3 This paper proposes a DC voltage equalizing circuit for a diode-clamped linear amplifier (DCLA). The DCLA consists of series-connected complementary MOSFETs and diode clamping circuits, with an experimental efficiency as high as 90% without switching operation. The DCLA requires a DC voltage equalizing circuit to divide the DC voltage into several levels. The proposed DC voltage equalizing circuit allows the use of a diode rectifier with a smoothing capacitor as a power supply for the DCLA. Zero-sequence voltage control is proposed to improve the efficiency of the DCLA. As a result, a prototype 12-series DCLA demonstrates an experimental efficiency as high as 94.7%. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 179(2): 55–63, 2012; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.21131
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Study of a DC-Voltage Equalizing Circuit and a Zero-Sequence Voltage Control Method for a Diode-Clamped Linear Amplifier
IEEJ Transactions on Industry Applications, 2009Co-Authors: Naoya Yamashita, Hideaki FujitaAbstract:This paper proposes a dc-voltage equalizing circuit for a diode-clamped linear amplifier (DCLA). The DCLA consists of series-connected complementary MOSFETs and diode clamping circuits, which has an experimental efficiency as high as 90% without switching operation. The DCLA requires a dc-voltage equalizing circuit to divide the dc voltage into several levels. The proposed dc-voltage equalizing circuit enables to use a diode rectifier with a smoothing capacitor as a power supply for the DCLA. Moreover, zero-sequence voltage control is proposed to improve efficiency of the DCLA. As a result, a prototype twelve-series DCLA demonstrates an experimental efficiency as high as 94.7%.
Dae-jin Kim - One of the best experts on this subject based on the ideXlab platform.
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Novel Voltage Control Method of the Primary Feeder by the Energy Storage System and Step Voltage Regulator
Energies, 2019Co-Authors: Byungki Kim, Kyung-sang Ryu, Yang-hyun Nam, Ho-chan Kim, Chul Ho Park, Dae-jin KimAbstract:With the intention of keep the customer voltage within a nominal voltage boundary (the South Korea voltage regulation in range of 220 V ± 6% for a single phase), the SVR (step voltage regulator) Method in the primary feeder has been seriously systematized for the scheduled tap time delay (from a minimum of 120 s to a maximum of 900 s). The voltage must be compensated for the primary feeder during the tap delay time of SVR. However, when RES (renewable energy resource) is connected with the primary feeder, the customer voltage could exceed the nominal voltage boundary. Therefore, in order to keep the secondary feeder voltage within the nominal voltage boundary at all the time, this paper proposed a novel voltage control Method in the primary feeder using coordinated controls between ESS (energy storage system) and SVR. Through the simulations based on PSCAD/EMTDC which is analysis tool of power system, it is confirmed that the proposed algorithm can effectively control the customer voltage within allowable limitation.
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A Study on the Voltage Control Method of Primary Feeder by the Energy Storage System and Step Voltage Regulator
IFAC-PapersOnLine, 2019Co-Authors: Byungki Kim, Kyung-sang Ryu, Dae-jin Kim, Yang-hyun Nam, Ho-chan KimAbstract:Abstract In order to keep the customer voltages within nominal voltage boundary (220±6%), operation Method of SVR(Step Voltage Regulator) at primary feeder is very important considering the scheduled tap time delay(120 sec) of SVR However, the compensation of voltage during the tap delay time of SVR is being required at primary feeder introduced in RES (Renewable Energy Recourse). Because customer voltage should be to exceed nominal voltage boundary during the operated time of RES. Therefore, in order to keep the secondary feeder voltage within nominal voltage boundary at all the time, this paper proposed the voltage control Method in primary feeder by using coordination control algorithm between ESS (Energy Storage System) and SVR. From the simulation results analysis of customer voltages by presenting voltage control Method between ESS and SVR based on the PSCAD/EMTDC, it is confirmed that customer voltage in distribution system can be maintained within allowable limit.
Seyedfoad Taghizadeh - 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.
