Electrical energy quality management device of electrified railway with differentiated compensation
An electrified railway, power quality technology, applied in circuit devices, electrical components, reactive power compensation and other directions, can solve the problems of increasing the burden on the cooling system, unable to solve the coordination problem well, increasing the switching loss and cost of equipment, etc. Industrial standardized production, reducing the number of secondary windings, and the effect of low loss
Active Publication Date: 2014-08-27
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology
[0006] Compensating the fundamental reactive power, negative sequence and harmonics with the same converter does not solve the coordination problem among various compensation targets of the device. The harmonic compensation of the device needs to increase the switching frequency of all power devices, which will Greatly increase the switching loss and cost of the equipment, increase the burden on the cooling system and other issues
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[0023] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0024] The schematic diagram of the main circuit structure of the electrified railway power quality control device with differential compensation according to the present invention is as follows: figure 1 As shown, the device includes two single-phase multi-winding transformers 1, and the secondary winding of each single-phase multi-winding transformer 1 includes a parallel low-frequency module 2 and a high-frequency module 3; Terminals x, y, z and w are respectively connected to the two-phase windings on the secondary side of the traction transformer.
[0025] The present invention uses a single-phase multi-winding transformer 1 to realize the parallel connection and electrical isolation functions of multiple voltage source converters. For the low-frequency module 2, the mutual impedance between the se...
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The invention belongs to the field of power supply and power electronic technologies and electrical energy quality management of electrified railways and in particular relates to an electrical energy quality management device of the electrified railway with differentiated compensation. The device comprises a single-phase multi-winding transformer, a low-frequency module constituted by m back-to-back voltage source current transformers which are connected with a secondary side winding of the single-phase multi-winding transformer in parallel and a high-frequency module; and the device is connected with a two-phase winding on the secondary side of a traction transformer through x, y, z and w terminals of the single-phase multi-winding transformer. Improvement is performed on the topological structure of the device, the low-frequency module and the high-frequency module are adopted for performing decoupling compensation on a low-frequency component and a high-frequency component based on the idea of the differentiated compensation, and the device has the advantages of reducing the switching loss of the device, reducing the cost of the device and facilitating industrial standard production.
Description
technical field [0001] The invention belongs to the fields of electrified railway power supply, power electronics technology and power quality control, and specifically relates to a differentially compensated electrified railway power quality control device. Background technique [0002] The load of electrified railway has the characteristics of nonlinearity, asymmetry and fluctuation. On the one hand, since the electrified railway traction power supply system adopts single-phase power supply mode, and the electric locomotive is a single-phase load, no matter what wiring mode the traction transformer adopts, a large negative sequence current will be injected into the system; on the other hand, due to the The locomotive uses power electronic converters, so a large number of harmonics are injected into the system. In addition, because the load of the traction substation fluctuates at any time with the number of trains in the power supply arm and the operating status of each t...
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IPC IPC(8): H02J3/00H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 于坤山周胜军乔光尧刘颖英
Owner CHINA ELECTRIC POWER RES INST