The Experts below are selected from a list of 165 Experts worldwide ranked by ideXlab platform
Xinbo Ruan - One of the best experts on this subject based on the ideXlab platform.
-
a hybrid fuel cell Power System
IEEE Transactions on Industrial Electronics, 2009Co-Authors: Xinbo Ruan, Mengxiong Yang, Min XuAbstract:This paper proposes a hybrid fuel cell Power System, which consists of a fuel cell, an isolated unidirectional converter, a bidirectional converter, an inverter, and a battery. The fuel cell and the battery are connected to the same voltage bus through an appropriate hybrid full-bridge LLC resonant unidirectional converter and a three-level buck/boost bidirectional converter, respectively. The battery is an auxiliary energy source, Powers the load during the System's start state to make it easy for the System to cold start, and provides or absorbs the dynamic Power when the load varies and the fuel cell cannot respond immediately, so the System dynamic characteristics are improved. Furthermore, the battery can also provide peak Power at overload, so the Power rating of the fuel cell can be decreased, which reduces the total System cost. In order to ensure that the System operates with high efficiency, this paper also proposes a Power management control scheme, which controls the bidirectional converter operating under buck, boost, or shutdown mode according to the operation condition of the fuel cell and battery, so that the battery can be charged or discharged. The operation of the System during cold start and overload are analyzed in detail. A 1-kW fuel cell Power System was built in the laboratory. Experimental results are shown to verify the theoretical analysis.
-
hybrid full bridge three level llc resonant converter a novel dc dc converter suitable for fuel cell Power System
IEEE Transactions on Industrial Electronics, 2006Co-Authors: Ke Jin, Xinbo RuanAbstract:This paper proposes a novel hybrid full-bridge (H-FB) three-level (TL) LLC resonant converter. It integrates the advantages of the H-FB TL converter and the LLC resonant converter. It can operate under both three-level mode and two-level mode, so it is very suitable for wide-input-voltage-range applications, such as Fuel-Cell Power Systems. Compared with the traditional full-bridge converter, the input current ripple and output filter can be reduced. In addition, all the switches can realize zero-voltage switching from nearly zero to full load, and the switches of the TL leg sustain only half of the input voltage. Moreover, the rectifier diodes can achieve zero-current switching, and the voltage stress across them can be minimized to the output voltage. A prototype of 200-400-V input and 360-V/4-A output is built in our laboratory to verify the operation principle of the proposed converter
-
three level bi directional converter a novel dc dc converter suitable for fuel cell Power System
Power Electronics Specialists Conference, 2006Co-Authors: Mengxiong Yang, Xinbo RuanAbstract:A novel three-level bidirectional converter is proposed in this paper. Compared with the traditional bi-directional converter, the voltage stress on the switch of the proposed converter is just half of the voltage on the high voltage side. The inductor of three-level bi-directional converter also can be reduced significantly, so the dynamic response can be improved. Therefore, it is very suitable for fuel cell Power Systems. This paper also illustrates the operation principle and implementation of the control circuit. A 1kW prototype converter is built to verify the theoretical analysis.
-
hybrid full bridge three level llc resonant converter a novel dc dc converter suitable for fuel cell Power System
Power Electronics Specialists Conference, 2005Co-Authors: Ke Jin, Xinbo RuanAbstract:This paper proposes a novel hybrid full-bridge three-level LLC resonant converter. It integrates the advantages of the hybrid full-bridge three-level converter and the LLC resonant converter. It can operate not only under three-level mode but also under two-level mode, so it is very suitable for wide input voltage range application, such as fuel cell Power System. The input current ripple and output filter can also be reduced. Three-level leg switches just sustain only half of the input voltage. ZCS is achieved for the rectifier diodes, and the voltage stress across the rectifier diodes can be minimized to the output voltage. The main switches can realize ZVS from zero to full load. A 200-400 V input, 360 V/4 A output prototype converter is built in our lab to verify the operation principle of the proposed converter
Jih-sheng Lai - One of the best experts on this subject based on the ideXlab platform.
-
low frequency current ripple reduction technique with active control in a fuel cell Power System with inverter load
IEEE Transactions on Power Electronics, 2007Co-Authors: Changrong Liu, Jih-sheng LaiAbstract:A fuel cell Power System that contains a single-phase dc-ac inverter tends to draw an ac ripple current at twice the output frequency. Such a ripple current may shorten fuel cell life span and worsen the fuel efficiency due to the hystersis effect. The most obvious impact is it tends to reduce the fuel cell output capacity because the fuel cell controller trips under instantaneous over-current condition. In this paper, the ripple current propagation path is analyzed, and its linearized ac model is derived. The equivalent circuit model and ripple current reduction with passive energy storage component are simulated and verified with experiments. An advanced active control technique is then proposed to incorporate a current control loop in the dc-dc converter for ripple reduction. The proposed active ripple reduction method has been verified with computer simulation and hardware experiment with a proton exchange membrane type fuel cell using a multiphase dc-dc converter along with a full-bridge dc-ac inverter. Test results with open loop, single voltage loop, and the proposed active current-loop control are provided for comparison.
-
low frequency current ripple reduction technique with active control in a fuel cell Power System with inverter load
Power Electronics Specialists Conference, 2005Co-Authors: Changrong Liu, Jih-sheng LaiAbstract:A fuel cell Power System that contains a single-phase dc-ac inverter tends to draw an ac ripple current at twice the output frequency. Such a ripple current may shorten fuel cell life span and worsen the fuel efficiency due to the hysteresis effect. The most obvious impact is it tends to reduce the fuel cell output capacity because the fuel cell controller trips under instantaneous over-current condition. In this paper, the ripple current propagation path is analyzed, and its linearized ac model is derived. The equivalent circuit model and ripple current reduction with passive energy storage component are simulated and verified with experiments. An advanced active control technique is then proposed to incorporate a current control loop in the dc-dc converter for ripple reduction. The proposed active ripple reduction method has been verified with computer simulation and hardware experiment with a proton exchange membrane type fuel cell using a multiphase dc/dc converter along with a full-bridge dc-ac inverter. Test results with open loop, single voltage loop, and the proposed active current-loop control are provided for comparison
-
Impact of SOFC fuel Cell Source Impedance on Low Frequency AC Ripple
37th IEEE Power Electronics Specialists Conference, 1Co-Authors: Seung-ryul Moon, Jih-sheng Lai, Sung-yeul Park, Changrong LiuAbstract:A fuel cell is a non-ideal voltage source with a wide varying source impedance, depending on output Power scale and operating conditions, such as operating temperature, fuel pressure, quality of fuel, etc. A stationary fuel cell Power System that consists of a single-phase dc-ac inverter tends to draw an ac ripple current at twice the output frequency, and the peak-to-peak amplitude of the ac ripple at the fuel cell output depending largely on the source impedance. In this paper, the ripple current propagation path is analyzed, and its linearized ac model is presented. Relationship between the peak-to-peak amplitude of ac ripple and the fuel cell source impedance is studied using equivalent circuit model, and the model is verified via simulation and experimental results. To reduce ripple seen by the fuel cell, an advanced active ripple control technique is integrated into the dc-dc converter. The effect of the control technique on various source impedances is experimented, and the test results between open-loop and closed-loop control techniques are compared. The dynamic response of the entire fuel cell Power System under load transient condition is tested to verify the stability of the controller. The results indicate that the controller originally designed for steady state ripple reduction ripple reduction remains stable during severe load transients. 1
Changrong Liu - One of the best experts on this subject based on the ideXlab platform.
-
low frequency current ripple reduction technique with active control in a fuel cell Power System with inverter load
IEEE Transactions on Power Electronics, 2007Co-Authors: Changrong Liu, Jih-sheng LaiAbstract:A fuel cell Power System that contains a single-phase dc-ac inverter tends to draw an ac ripple current at twice the output frequency. Such a ripple current may shorten fuel cell life span and worsen the fuel efficiency due to the hystersis effect. The most obvious impact is it tends to reduce the fuel cell output capacity because the fuel cell controller trips under instantaneous over-current condition. In this paper, the ripple current propagation path is analyzed, and its linearized ac model is derived. The equivalent circuit model and ripple current reduction with passive energy storage component are simulated and verified with experiments. An advanced active control technique is then proposed to incorporate a current control loop in the dc-dc converter for ripple reduction. The proposed active ripple reduction method has been verified with computer simulation and hardware experiment with a proton exchange membrane type fuel cell using a multiphase dc-dc converter along with a full-bridge dc-ac inverter. Test results with open loop, single voltage loop, and the proposed active current-loop control are provided for comparison.
-
low frequency current ripple reduction technique with active control in a fuel cell Power System with inverter load
Power Electronics Specialists Conference, 2005Co-Authors: Changrong Liu, Jih-sheng LaiAbstract:A fuel cell Power System that contains a single-phase dc-ac inverter tends to draw an ac ripple current at twice the output frequency. Such a ripple current may shorten fuel cell life span and worsen the fuel efficiency due to the hysteresis effect. The most obvious impact is it tends to reduce the fuel cell output capacity because the fuel cell controller trips under instantaneous over-current condition. In this paper, the ripple current propagation path is analyzed, and its linearized ac model is derived. The equivalent circuit model and ripple current reduction with passive energy storage component are simulated and verified with experiments. An advanced active control technique is then proposed to incorporate a current control loop in the dc-dc converter for ripple reduction. The proposed active ripple reduction method has been verified with computer simulation and hardware experiment with a proton exchange membrane type fuel cell using a multiphase dc/dc converter along with a full-bridge dc-ac inverter. Test results with open loop, single voltage loop, and the proposed active current-loop control are provided for comparison
-
Impact of SOFC fuel Cell Source Impedance on Low Frequency AC Ripple
37th IEEE Power Electronics Specialists Conference, 1Co-Authors: Seung-ryul Moon, Jih-sheng Lai, Sung-yeul Park, Changrong LiuAbstract:A fuel cell is a non-ideal voltage source with a wide varying source impedance, depending on output Power scale and operating conditions, such as operating temperature, fuel pressure, quality of fuel, etc. A stationary fuel cell Power System that consists of a single-phase dc-ac inverter tends to draw an ac ripple current at twice the output frequency, and the peak-to-peak amplitude of the ac ripple at the fuel cell output depending largely on the source impedance. In this paper, the ripple current propagation path is analyzed, and its linearized ac model is presented. Relationship between the peak-to-peak amplitude of ac ripple and the fuel cell source impedance is studied using equivalent circuit model, and the model is verified via simulation and experimental results. To reduce ripple seen by the fuel cell, an advanced active ripple control technique is integrated into the dc-dc converter. The effect of the control technique on various source impedances is experimented, and the test results between open-loop and closed-loop control techniques are compared. The dynamic response of the entire fuel cell Power System under load transient condition is tested to verify the stability of the controller. The results indicate that the controller originally designed for steady state ripple reduction ripple reduction remains stable during severe load transients. 1
Ke Jin - One of the best experts on this subject based on the ideXlab platform.
-
hybrid full bridge three level llc resonant converter a novel dc dc converter suitable for fuel cell Power System
IEEE Transactions on Industrial Electronics, 2006Co-Authors: Ke Jin, Xinbo RuanAbstract:This paper proposes a novel hybrid full-bridge (H-FB) three-level (TL) LLC resonant converter. It integrates the advantages of the H-FB TL converter and the LLC resonant converter. It can operate under both three-level mode and two-level mode, so it is very suitable for wide-input-voltage-range applications, such as Fuel-Cell Power Systems. Compared with the traditional full-bridge converter, the input current ripple and output filter can be reduced. In addition, all the switches can realize zero-voltage switching from nearly zero to full load, and the switches of the TL leg sustain only half of the input voltage. Moreover, the rectifier diodes can achieve zero-current switching, and the voltage stress across them can be minimized to the output voltage. A prototype of 200-400-V input and 360-V/4-A output is built in our laboratory to verify the operation principle of the proposed converter
-
hybrid full bridge three level llc resonant converter a novel dc dc converter suitable for fuel cell Power System
Power Electronics Specialists Conference, 2005Co-Authors: Ke Jin, Xinbo RuanAbstract:This paper proposes a novel hybrid full-bridge three-level LLC resonant converter. It integrates the advantages of the hybrid full-bridge three-level converter and the LLC resonant converter. It can operate not only under three-level mode but also under two-level mode, so it is very suitable for wide input voltage range application, such as fuel cell Power System. The input current ripple and output filter can also be reduced. Three-level leg switches just sustain only half of the input voltage. ZCS is achieved for the rectifier diodes, and the voltage stress across the rectifier diodes can be minimized to the output voltage. The main switches can realize ZVS from zero to full load. A 200-400 V input, 360 V/4 A output prototype converter is built in our lab to verify the operation principle of the proposed converter
Guoqiao Shen - One of the best experts on this subject based on the ideXlab platform.
-
A High Step-Up DC to DC Converter Under Alternating Phase Shift Control for Fuel Cell Power System
IEEE Transactions on Power Electronics, 2015Co-Authors: Longlong Zhang, Min Chen, Guoqiao Shen, Dehong Xu, Adrain Ioinovici, Xiaotian WuAbstract:This paper investigates a novel pulse width modulation (PWM) scheme for two-phase interleaved boost converter with voltage multiplier for fuel cell Power System by combining alternating phase shift (APS) control and traditional interleaving PWM control. The APS control is used to reduce the voltage stress on switches in light load while the traditional interleaving control is used to keep better performance in heavy load. The boundary condition for swapping between APS and traditional interleaving PWM control is derived. Based on the aforementioned analysis, a full Power range control combining APS and traditional interleaving control is proposed. Loss breakdown analysis is also given to explore the efficiency of the converter. Finally, it is verified by experimental results.
-
Power Management Unit With Its Control for a Three-Phase Fuel Cell Power System Without Large Electrolytic Capacitors
IEEE Transactions on Power Electronics, 2011Co-Authors: Wenping Zhang, Ren Xie, Min Chen, Guoqiao ShenAbstract:This paper investigates a three-phase four-wire fuel cell Power System. The System is sensitive to the load characteristic in a stand-alone mode, because variation or unbalance of the three-phase load will affect the safety and lifespan of the fuel cell. A novel Power management unit (PMU) with its control strategy is proposed. The PMU can compensate fuel cell slow dynamics. In addition, the PMU acts as dc bus capacitors to deal with the low-frequency current ripple. Therefore, the large dc bus electrolytic capacitors can be eliminated in the fuel cell Power System. The control strategy of the PMU is derived and the whole System is verified by the experimental results.
