DongFang Electric Corporation

www.dongfang.com.cn/
Chengdu, China

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.

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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.


Patent
DongFang Electric Corporation | Date: 2015-09-24

The present disclosure discloses a method for preparing carbon-coated lithium titanate, and provides a method for preparing a carbon-coated lithium titanate anode material for a lithium battery. The method prepares a lithium titanate precursor first, then coats a polymer on the surface of the precursor through emulsion polymerization, and finally performs sintering, and obtaining a carbon-coated lithium titanate material. The present disclosure obtains a carbon source of the polymer through the emulsion polymerization. The carbon source is coated on the surface of lithium titanate uniformly and compactly with a better coating effect than a common mechanical mixing method. The polymer is coated while agglomeration of a lithium titanate crystal is prevented during the emulsion polymerization process, and an obtained product has a small particle size and a uniform size. The carbon-coated lithium titanate prepared by the present disclosure has excellent cycling performance during charging and discharging at a high rate.


The invention provides a thermal management system for a fuel cell, a fuel cell system and a vehicle equipped with the fuel cell system. The thermal management system for a fuel cell comprises: a cooling system (100) for recovering the waste heat produced by the fuel cell system, a heat supply system (15) connected with the cooling system (100) to supply heat using the waste heat recovered by the cooling system (100). The fuel cell system comprises a fuel cell stack and the aforementioned thermal management system for a fuel cell. The vehicle comprises the fuel cell system, wherein the thermal management system for a fuel cell reduces the temperature of each component of the fuel cell system by cooling the component using the cooling system (100) and recovers the waste heat generated by the fuel cell system, and the heat supply system (15) supplies heat by using the waste heat recovered by the cooling system as a heat source, thus effectively using the heat generated by a fuel cell stack, the heat of exhaust gas and the heat generated by electrical accessories during the running process of the fuel cell stack and consequentially reducing the running cost of the fuel cell.


A pyrolysis-combustion dual-bed system 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 an upper lateral side of the fluidized bed, the outlet end of the cyclone separator is connected with the inlet end of the coal ash distributor; the two outlets of the lower pyrolysis bed are respectively connected with the inlet of an external bed and the inlet of the cleaner; the outlet of the external bed is connected with the inlet of the return feeder; 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 of the lower lateral side of the fluidized bed.


Patent
DongFang Electric Corporation | Date: 2013-10-09

An external bed type double-fluidized bed system for preventing boiler contamination includes a fluidized bed combustion furnace, a cyclone separator, a coal ash distributor and a fluidized bed pyrolysis furnace. The fluidized bed combustion furnace is connected with the coal ash distributor, the coal ash distributor is connected with the coal ash inlet on a side wall of the fluidized bed combustion furnace through a return feeder with which the coal ash outlet of the fluidized bed pyrolysis furnace is also connected through an external bed, and the return feeder is connected with the fluidized bed combustion furnace. A fuel coal is pyrolyzed in the fluidized bed pyrolysis furnace at a temperature to volatize alkali chlorides into a pyrolysis gas, thereby reducing the content of the alkali chlorides contained in the coal in the fluidized bed combustion furnace and relieving the contamination to a convective heat-absorbing surface.


Patent
DongFang Electric Corporation | Date: 2011-11-09

The disclosure discloses a liquid flow battery system and a repairing device thereof. The repairing device, used for cleaning a battery stack of the liquid flow battery system, comprises an acid liquid storage tank (11), configured to store an acid solution; a first acid liquid pipe (12) connected with a first end of the acid liquid storage tank (11), configured to be connected with a first end of the battery stack; a second acid liquid pipe (13) connected with a second end of the acid liquid storage tank (11), configured to be connected with a second end of the battery stack; and a power device (14) arranged in the first acid liquid pipe (12) or the second acid liquid pipe (13) and configured to drive the acid solution in the acid liquid storage tank (11) to flow circularly in the first acid liquid pipe (12) and the second acid liquid pipe (13). Through the disclosure, the liquid flow battery system can be cleaned conveniently and in time, so as to realize the self-repairing of the liquid flow battery, improve the operational efficiency of the liquid flow battery and prolong the service life of the liquid flow battery system.


Patent
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.


Patent
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.


Patent
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.


Patent
DongFang Electric Corporation | Date: 2012-07-03

Disclosed is a flow battery pack with a monitoring system. The flow battery pack with a monitoring system comprises a battery pack device and a monitoring device. The battery pack device comprises a pole plate, and the pole plate is provided thereon with a measuring port. The monitoring device comprises a measuring probe, and the measuring probe extends to the interior of the battery pack device and is arranged corresponding to the measuring port on the pole plate. The monitoring device is used for monitoring the flow pressure and temperature at the measuring port. According to the technical solution of the present disclosure, a monitoring device is introduced into the interior of a flow battery pack, and the real values of correlative parameters of the interior of the battery pack and the distribution status thereof can be obtained through the monitoring device.

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