Flexible direct current power transmission converter performance testing platform and control method thereof

A flexible DC power transmission and test platform technology, applied in the measurement of electrical variables, instruments, and measurement of electricity, etc., can solve the problem of large differences in the structure of the converter, the inability to test the algorithm level of the control strategy of the converter, and the lack of short-circuit and overload. problems such as current shutdown test, to achieve the effect of low power strength and capacity requirements

CN104714132AInactive Publication Date: 2015-06-17SHANGHAI JIAO TONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-06-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a flexible direct current power transmission converter performance testing platform and a control method thereof. The direct current side of a first modularized multi-level converter and the direct current side of a second modularized multi-level converter are connected in a back-to-back mode, and three phases of the alternating current side of the first modularized multi-level converter are connected with three phases of the alternating current side of the second modularized multi-level converter correspondingly, so that a power circulation pathway is formed; a test power source is in parallel connection with the direct current side of the first modularized multi-level converter and the direct current side of the second modularized multi-level converter and provides loss power for steady-state operation testing; a short circuit generator is in parallel connection with the direct current side of the first modularized multi-level converter and the direct current side of the second modularized multi-level converter. According to the testing platform and the control method thereof, the requirement for power grid capacity is low; meanwhile, the direct current side power supply mode is adopted in the testing platform, and therefore the single test power source is adopted for the whole platform. With regard to test items of the short circuit and over-current turn-off required by IEC standards, due to the fact that the basic structure of the platform is basically the same with that of practical engineering, the short circuit test and the over-current turn-off test can be set through the platform according to double-pole short-circuit faults in a practical flexible direct current power transmission system.
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Description

technical field

[0001] The invention relates to a system in the technical field of testing high-voltage and high-power power electronic converters, in particular to a modular multi-level flexible direct current transmission converter performance testing platform and a control method thereof. Background technique

[0002] Flexible DC transmission technology is a new type of power transmission technology based on voltage source commutation VSC technology and fully-controlled power devices (IGBT, IEGT) with gates that can be turned off. Compared with traditional DC transmission technology, it has the ability to connect weak AC systems. , Power supply to the passive network, improve the penetration power of wind power and other new energy sources connected to the grid, etc. With the continuous development of flexible DC converter technology at home and abroad in recent years, its voltage level and transmission capacity are also increasing, and it has begun to be applied to my co...

Examples

Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0036] The invention provides a performance testing platform of a flexible direct current transmission converter. Including: two three-phase modular multilevel converters, two DC filters, test power supply, and short-circuit generating device. Among them: the phases A, B, and C of the AC sides of the first and second modular multilevel converters are connected to each other respectively, and the positive and negative poles of the first modular multilevel converter pass through the DC filter L1 and...