Starting control method of variable-frequency power transmission system
A power transmission system, frequency conversion start-up technology, applied in the direction of output power conversion devices, electrical components, circuit devices, etc., can solve problems such as unrelated engineering applications, start-up control research blanks, etc., to reduce start-up time, reduce impact, and ensure flexibility sexual effect
Pending Publication Date: 2021-11-19
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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Problems solved by technology
[0004] At this stage, frequency conversion transmission is still in the theoretical research stage, and there is no related engineering application, so the research on its start-up control is almost blank
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[0020] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] The frequency conversion transmission system includes at least two frequency conversion stations, taking the three-stage frequency conversion transmission system as an example, figure 1 A schematic diagram of the main wiring of a three-terminal variable frequency transmission system is given. The frequency conversion stations in the frequency conversion transmission system are connected by frequency conversion transmission lines (networks). In each frequency conversion station, the power frequency AC system passes through the power frequency circuit breaker, power frequency transformer, power frequency starting circuit, frequency converter, frequency conversion starting circuit and frequency breaking circuit in turn. connecte...
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The invention discloses a starting control method of a variable-frequency power transmission system. According to the technical scheme, the method comprises the following steps: firstly, selecting a frequency conversion station connected with an active power frequency power grid, and starting the frequency conversion station to an unlocking state; then, according to a preset starting sequence, starting other frequency conversion stations in sequence to be in an unlocking state; and after all the frequency conversion stations are unlocked, setting the frequency conversion stations according to preset active power and reactive power until the frequency conversion power transmission system operates stably. According to the method, smooth and impact-free starting of the variable-frequency power transmission system can be realized, the starting flexibility of each variable-frequency station can be ensured, and the influence of other stations is reduced; and in the starting process, when starting fails due to part of reasons, the electrified starting part is not affected, and the engineering site starting time can be greatly shortened.
Description
technical field [0001] The invention belongs to the field of electric power transmission, and in particular relates to a start-up control method of a frequency conversion power transmission system. Background technique [0002] With the development of load and the further development of resources, large-capacity and long-distance power transmission has become an inevitable demand. However, due to the effect of line capacity rise and transmission loss, power frequency AC cannot achieve large power even with high voltage levels. Capacity for efficient transmission over long distances. After the 1950s, DC transmission technology suitable for long-distance large-capacity transmission has been developed again. However, in terms of voltage level conversion and fault current interruption, due to the immature technology of DC transformers and DC circuit breakers, and the huge investment in equipment, DC networking is still difficult. [0003] Frequency conversion transmission tech...
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Login to View More IPC IPC(8): H02J3/00H02M1/36
CPCH02J3/00H02M1/36
Inventor 许烽裘鹏陆翌倪晓军林进钿叶珺歆周国华陆承宇黄晓明
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY