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| 2. |
- Demetriades, Georgios D., et al.
(författare)
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Characterization of the Dual-Active Bridge Topology for High-Power Applications Employing a Duty-Cycle Modulation
- 2008
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Ingår i: 2008 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-10. - NEW YORK, NY : IEEE. - 9781424416677 ; , s. 2791-2798
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Konferensbidrag (refereegranskat)abstract
- In the present paper the Dual-Active Bridgetopology employing a duty-cycle modulation is studied. Thebehavior of the converter at steady-state is examined.Additionally, the small-signal model of the topology ispresented and the dynamic behavior is examined.Simulations and experimental results are presented. It isworth noticing that the converter is operated under softswitchingconditions in a wide load range.
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| 3. |
- Demetriades, Georgios D., et al.
(författare)
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Dynamic Modeling of the Dual-Active Bridge Topology for High-Power Applications
- 2008
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Ingår i: 2008 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-10. - NEW YORK : IEEE. - 9781424416677 ; , s. 457-464
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Konferensbidrag (refereegranskat)abstract
- In the present paper the staedy-state and thedynamic behavior of the Dual-Active Bridge topology havebeen studied. The small-signal model of the converter hasbeen derived and theoretical and experimental results arepresented.The Dual-Active Bridge is an attractive solution for highpowerapplications where a bi-directional operation is needed.
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| 4. |
- Xie, Hailian, et al.
(författare)
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Impact of energy storage on system performance under fault conditions
- 2007
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Ingår i: International CIGRE Zagreb Symposium 2007. - 9782858730223
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Konferensbidrag (refereegranskat)abstract
- This work investigates the impact of the energy stored in the dc side capacitor of a converter on the system performance under fault conditions. The system under investigation consists of two interconnected sources feeding a radial string of heavily loaded transmission lines. Along the lines six large induction motors are connected together with eight other loads and some capacitor banks supplying the reactive power consumption in the motors and lines. Since the system is vulnerable to faults close to the sources, additional reactive power support is necessary to improve the fault ride-through capability of the system and the performance of the motors. During a fault, the motor terminal voltage is very low. The unbalance between the electrical torque and the mechanical torque decelerates the motor. After the fault-clearance, the motor starts to accelerate if the electrical torque generated is larger than the mechanical torque. In order to produce the required torque, the motor consumes much more reactive power than under normal condition. If the reactive power support is not sufficient, the motor will keep decelerating until it stops. A StatCom can be installed to provide fast and dynamic reactive power support and voltage control to the system. In this paper, a control scheme for a StatCom with energy storage capability is proposed. The system performance, especially the motor speeds, will be analyzed through simulations carried out in PSCAD. It is shown in the paper that the scheme with active power compensation effectively helps the system to recover from faults. Although this incurs extra cost for the increased dc voltage of the converter and the dc side capacitor, the overall rating of the converter can be reduced by utilization of the proposed scheme.
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| 5. |
- Xie, Hailian, et al.
(författare)
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StatCom with Capacitive Energy Storage for Compensation of Cyclic Loads
- 2008
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Ingår i: Proceedings of the Nordic Workshop on Power and Industrial Electronics (NORpie) 2008.
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Konferensbidrag (refereegranskat)abstract
- Pulsating power consumption of a cyclic load may cause considerable disturbances in the voltage at the connection point. A StatCom can be employed to maintain the bus voltage level. With the integration of energy storage to the StatCom, the power quality at the connection point can be further improved by the additional active power compensation capability. This paper studies the control strategy for a StatCom with capacitive energy storage for compensation of a cyclic load. Simulations verify the proposed control scheme and show that both the phase jump and magnitude deviation of the bus voltage can be reduced by means of reactive and active power compensation.
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| 6. |
- Zhang, Lidong, et al.
(författare)
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Multivariable feedback design of VSC-HVDC connected to weak ac systems
- 2009
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Ingår i: 2009 IEEE Bucharest PowerTech. - : IEEE. - 9781424422340 ; , s. 764-771
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Konferensbidrag (refereegranskat)abstract
- Power-synchronization control is particularly applicable to voltage-source converters based high-voltage direct-current (HVDC) transmission connected to weak ac systems. In this paper, the multivariable feedback design aspect of the power-synchronization control is investigated by two design approaches: internal model control (IMC) and Hinfin control. The paper shows that both of the methods can meet the design requirements and show good robustness with different model uncertainties and load disturbances. The advantage of the IMC approach is that it provides a transparent framework for control-system design and tuning. The algorithm used for the IMC design in this paper is simple, yet it achieves similar or even better performance and robustness compared to the more advanced optimization-based Hinfin controller.
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