A method and control system for putting modular multi-level converter into operation when powered on
A modular multi-level, put into operation technology, applied in the direction of power transmission and AC network, can solve the problem that the short-circuit charging algorithm cannot adapt to, and cannot judge the abnormality of sub-modules, so as to achieve the effect of stable operation and relieve the pressure of the algorithm.
Active Publication Date: 2022-07-22
NR ELECTRIC CO LTD +1
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[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 with reference to the accompanying drawings and specific embodiments.
[0064] The present invention proposes a method for putting into operation of a modular multilevel converter with power on, and the method is based on a device for putting into operation with power on the modular multilevel converter. like Image 6 Shown is a schematic diagram of a device that puts a modular multilevel converter into operation. The device includes a modular multilevel converter and an additional circuit; the additional circuit includes two ports, a first DC port and a second DC port, respectively; the first DC port of the additional circuit is connected in parallel with the the 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 loop forms the DC port of the device; The additional loop i...
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The invention discloses a method for putting a modular multi-level converter into operation with electricity, which is based on a device for putting the modular multi-level converter into operation with electricity. The inverter is precharged in an open-circuit state, and at the same time, it is detected whether the sub-module is abnormal. After the abnormality is handled, short-circuit charging of the inverter is performed until the conditions for operation are met. This solution can eliminate abnormal sub-modules before formal charging, and at the same time enable the valve group to complete pre-charging before performing short-circuit charging, reducing the complexity of DC side short-circuit charging, simplifying the charging strategy, and creating good conditions for the smooth operation of the inverter. The invention also discloses a modular multi-level converter live operation control system.
Description
Technical field [0001] The invention relates to the field of flexible DC power transmission and distribution, and in particular to a method and a control system for putting a modular multi-level 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 in the direction of higher voltage levels, greater transmission capacity, and a higher proportion of overhead lines. In order to achieve higher DC voltage levels, a highly feasible solution is to use a double valve bank operated in series, with each pole consisting of two symmetrical unipolar converters connected in series. [0003] For such a main circuit topology, there is an important working condition: conversion from half-voltage operation to full-voltage operation. Under half-pressure operating conditions, only one valve group in each pole is put into operation...
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 胡仙来胡兆庆董云龙
Owner NR ELECTRIC CO LTD