China Dongfang Electric Corporation ; is one of the largest enterprises in China engaging in the manufacturing of power generators and the contracts of power station projects. It is a state-owned enterprise managed by the State Council of the People's Republic of China. It was founded in 1984 and is based in Chengdu, Sichuan. Its subsidiary is Dongfang Electric Corporation Limited . Its H shares and A shares were listed on the Hong Kong and Shanghai. Wikipedia.
Tian J.,DongFang Electric Corporation |
Chen Q.,Huazhong University of Science and Technology |
Xie B.,Huazhong University of Science and Technology
IET Power Electronics | Year: 2012
In order to reduce inverter capacity and enhance system reliability, a novel series hybrid active power filter (APF) based on controllable harmonic impedance is proposed in this study. As the pulse-width-modulated inverter works as a controlled harmonic current source, the series transformer (ST) can exhibit the controllable impedance to harmonic current, which makes the impedance of primary winding of series transformer very high for all frequencies except for the fundamental, thus forcing all harmonic current components through the passive filters and therefore preventing harmonic currents from entering the main power system. Adopting the small self-inductance ST, the inverter and secondary winding of the ST need not endure the fundamental current but only endure the injected harmonic currents, and the LC fundamental tuned bypass can be omitted; so the cost of the proposed APF will be very low. The validity of the proposed APF is verified by the simulation and experimental results. © 2011 The Institution of Engineering and Technology. Source
DongFang Electric Corporation | Date: 2013-09-25
A dual-bed system for preventing a boiler heating surface from being contaminated comprises a fluidized bed, a cyclone separator, a coal ash distributor, an ash-coal mixer, a lower pyrolysis bed, a return feeder and a cleaner, wherein the cyclone separator is connected with the upper lateral side of the fluidized bed; the inlet end of the coal ash distributor; the two outlets of the coal ash distributor are respectively connected with the inlet of the return feeder and the inlet of the ash-coal mixer; the outlet of the ash-coal mixer is connected with the inlet of the lower pyrolysis bed; the return feeder close to the lower lateral side of the fluidized bed is connected with the inlet on the lower lateral side of the fluidized bed; and the outlet of the cleaner is connected with the inlet on the lower lateral side of the fluidized bed.
Xiao S.,Tsinghua University |
Yang G.,Tsinghua University |
Zhou H.,DongFang Electric Corporation |
Geng H.,Tsinghua University
IEEE Transactions on Industrial Electronics | Year: 2013
For doubly fed induction generator (DFIG)-based wind energy conversion systems (WECSs), large electromotive force will be induced in the rotor circuit during grid faults. Without proper protection scheme, the rotor side of DFIG will suffer from overcurrents, which may even destroy the rotor-side converter (RSC). To mitigate this problem, a new flux-linkage-tracking-based low-voltage ride-through (LVRT) control strategy is proposed to suppress the short-circuit rotor current. Under the proposed control strategy, the rotor flux linkage is controlled to track a reduced fraction of the changing stator flux linkage by switching the control algorithm of RSC during grid faults. To validate the proposed control strategy, a case study of a typical 1.5-MW DFIG-based WECS is carried out by simulation using the full-order model in SIMULINK/ SimPowerSystems. In the case study, a comparison with a typical LVRT method based on RSC control is given, and the effect of the control parameter on the control performance is also investigated. Finally, the validity of the proposed method is further verified by means of laboratory experiments with a scaled-size DFIG system. © 1982-2012 IEEE. Source
DongFang Electric Corporation | Date: 2013-01-31
The disclosure discloses a porous electrode assembly, a flow half-cell and a flow cell stack. The porous electrode assembly includes multiple porous electrodes which are stacked, wherein at least two porous electrodes are flow passage electrodes with flow passage, and a part of flow passages of at least two flow passage electrodes are mutually communicated to form a flow field. The flow field used for circulating an electrolyte and formed by communicating the flow passages one another is arranged in at least one porous electrode of the porous electrode assembly, and the electrolyte flows in the porous electrodes under a flow guide effect of the flow field, so that surface areas, permeated by the electrolyte, of solid parts of the porous electrodes are enlarged, flow resistance of the porous electrodes to the flowing of the electrolyte is reduced, and a flow pressure difference is reduced.
DongFang Electric Corporation | Date: 2011-11-09
Provided is a flow battery system and a control method and device thereof. The control method of the flow battery system includes: monitoring the temperature of the flow battery system; judging whether the temperature of the flow battery system exceeds a predefined temperature value range or not; and if the temperature of the flow battery system exceeds the predefined temperature value range, adjusting the temperature of the flow battery system to make same fall into the predefined temperature value range. The present disclosure enables the flow battery system to operate within the predefined temperature value range, thus enhancing the charging and discharging efficiency of the flow battery system.