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A three-terminal DC transfer switch configuration evaluation method combining partial differential and random number principles

A transfer switch and partial differential technology, applied in the field of power transmission and distribution, can solve the problems of limited precision, many independent variables of mathematical models, and few researches, so as to achieve the effect of small breaking capacity and reduced engineering investment.

Active Publication Date: 2022-07-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

There are relatively few studies on the conversion strategy of the ground and metal loops of the three-terminal DC transmission system. Some scholars have quantitatively analyzed the conversion process of the ground and metal loops of the three-terminal DC transmission system by using the random number principle, but they do not consider the location of the switch configuration site. Influence, and there are many independent variables corresponding to the mathematical model, the accuracy of direct simulation with random numbers is limited

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  • A three-terminal DC transfer switch configuration evaluation method combining partial differential and random number principles
  • A three-terminal DC transfer switch configuration evaluation method combining partial differential and random number principles
  • A three-terminal DC transfer switch configuration evaluation method combining partial differential and random number principles

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specific Embodiment approach

[0017] The preferred specific embodiment of the three-terminal DC transfer switch configuration evaluation method combining partial differential and random number principles of the present invention is:

[0018] Include the following steps:

[0019] Step 1: Establish a three-terminal DC system ground and metal loop conversion model, and write down the multivariate function of switch stress under different transfer switch configuration schemes and conversion modes;

[0020] Step 2: Solve the maximum value of the switch stress multivariate function under different transfer switch configuration schemes and transfer modes respectively;

[0021] Step 3: The traversal of the maximum value of the switch stress under each transfer switch configuration scheme and conversion mode is smaller, and the optimal configuration scheme and conversion mode of the transfer switch can be determined;

[0022] The above three steps are performed in sequence.

[0023] In the step 1, the three-termi...

specific Embodiment

[0036] figure 1 It is a schematic diagram of the ground and metal loop conversion model of the three-terminal DC system.

[0037] Defined from left to right figure 1 The three stations in the middle are station 1, station 2, and station 3. During steady-state operation, any two stations can be regarded as current sources. It is advisable to define two stations with smaller capacity. For example, the DC output of station 2 and station 3 is I 2 , I 3 , at the same time define the resistance of the two DC lines as R 1 , R 2 , define the three-station grounding lead and the pole resistance as R respectively 3 , R 4 , R 5 . When the earth return line of the three-terminal pole 1 is running, the pole 2 is represented by a dotted line in the figure.

[0038] Each station of the three-terminal DC includes a metal return line conversion area and a ground return line conversion area to realize the conversion of the earth and metal return lines. The transfer area needs to be equ...

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Abstract

The invention discloses a three-terminal direct current transfer switch configuration evaluation method combining partial differential and random number principles. First, a three-terminal direct current system ground and metal loop conversion model is established, and the switch stress under different transfer switch configuration schemes and conversion modes is listed. Then, the maximum value of the multivariate function of the switch stress under different transfer switch configuration schemes and conversion modes is solved respectively; then the maximum value of the switch stress under each transfer switch configuration scheme and conversion mode is traversed to be smaller, and the conversion can be clearly defined. The optimal configuration scheme and conversion method of the switch. It can effectively evaluate the difference in the selection of transfer switches corresponding to different schemes. After optimization, the breaking capacity of the transfer switches can be minimized without affecting the basic functions, thereby directly reducing engineering investment. This method has strong reference significance for the configuration of earth and metal loop transfer switches in three-terminal DC engineering.

Description

technical field [0001] The invention relates to a power transmission and distribution technology, in particular to a configuration evaluation method for a three-terminal direct current transfer switch combining partial differential and random number principles. Background technique [0002] In order to improve equipment availability and reduce investment in transmission lines, long-distance DC projects mostly adopt the "true bipolar + grounding pole" structure. Taking the DC at both ends as an example, under normal circumstances, the two stations operate with double-pole ground return lines. When the poles are balanced, the ground current can be ignored. Under single-pole fault conditions, with the withdrawal of the fault pole, the ground pole will flow through. Rated current, in order to avoid the impact of large in-ground current on the oil and gas pipeline network, it is necessary to convert the running pole to unipolar metal loop operation in time. In addition, after th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36G06F17/16G06Q10/04G06Q50/06
CPCH02J3/36G06F17/16G06Q10/04G06Q50/06H02J2203/20Y02E60/60
Inventor 许建中黄曼茜
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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