Method and control system for putting modular multi-level converter into operation in charged manner
A modular multi-level, put into operation technology, applied in the direction of power transmission AC network, etc., can solve the problems that the short-circuit charging algorithm cannot adapt, cannot judge the abnormality of sub-modules, etc.
Active Publication Date: 2019-07-05
NR ELECTRIC CO LTD +1
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Problems solved by technology
[0005] The purpose of the present invention is to propose a method and control system for putting a modular multi-level converter into operation with electricity, which can solve the problem that in the current method of putting the converter into operation, the abnormality of the sub-module cannot be judged, and the short-circuit charging algorithm cannot adapt to the actual conversion. The problem of changing the parameters of the streamer
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[0063] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0064] The invention proposes a method for putting a modular multilevel converter into operation with power, and the method is based on a device for putting the modular multilevel converter into operation with power. Such as Figure 6 Shown is a schematic diagram of a modular multilevel converter put into operation. The device includes a modular multilevel converter and an additional circuit; the additional circuit includes two ports respectively a first DC port and a second DC port; the first DC port of the additional circuit is connected in parallel to the a DC port of the modular multilevel converter; the AC port of the modular multilevel converter forms the AC port of the device, and the second DC port of the additional circuit forms the DC port of the device; The additional circuit is composed of a switch, th...
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The invention discloses a method for putting a modular multi-level converter into operation in a charged manner, which is based on a device for putting the modular multi-level converter into operationin a charged manner. The converter is pre-charged in an open circuit state, whether sub-modules are abnormal or not is detected at the same time, then short-circuit charging is carried out on the converter after processing the abnormality until converter meets conditions of putting into operation. The scheme can eliminate abnormal sub-modules before the formal charging, and enables a valve groupto complete pre-charging before executing the short-circuit charging at the same time, thereby reducing the complexity of short-circuit charging at the DC side, simplifying the charging strategy, andcreating good conditions for stably putting the converter into operation. Meanwhile, the invention discloses a control system for putting the modular multi-level converter into operation in a chargedmanner.
Description
technical field [0001] The invention relates to the field of flexible DC power transmission and distribution, in particular to a method and a control system for putting a modular multilevel converter into operation with electricity. Background technique [0002] With the construction and operation of a series of flexible DC application projects, my country's flexible DC engineering technology is developing towards higher voltage levels, larger transmission capacity, and a higher proportion of overhead lines. In order to achieve a higher DC voltage level, a highly feasible solution is to use a double-valve group to operate in series, and each pole is formed by two symmetrical unipolar converters in series. [0003] For such a main circuit topology, there is an important working condition: half-voltage operation is transformed into full-voltage operation. Under half-pressure operating conditions, only one valve group is put into operation for one pole, and the other valve gro...
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Login to View More IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 胡仙来胡兆庆董云龙
Owner NR ELECTRIC CO LTD