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A method for optimally selecting a resistor for suppressing a DC bias current

An optimized selection and DC bias technology, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problems of increasing bias current and reduce the bias current , Guaranteed invariance and good applicability

Active Publication Date: 2019-01-04
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Among them, the neutral point series resistance method has good economic advantages, and does not affect the grid structure; but after a substation is connected with a small resistance in series, it may lead to an increase in the bias current of other stations, so how to optimize the neutral point series connection of each substation Small resistance configuration is very important

Method used

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  • A method for optimally selecting a resistor for suppressing a DC bias current
  • A method for optimally selecting a resistor for suppressing a DC bias current
  • A method for optimally selecting a resistor for suppressing a DC bias current

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Embodiment Construction

[0020] Such as figure 1 As shown, a resistance optimization selection method for suppressing DC bias current, the method includes the following sequential steps:

[0021] (1) Build a simulation model, and calculate the modeling of the grid structure based on the collected parameters of the substation ground grid, main transformer, and ground electrode conductor radius, segment number, conductor type, and coating type, and calculate the DC current in the ground. Distribution of substations;

[0022] (2) Select a substation with a DC current exceeding 10A for DC bias control;

[0023] (3) Connect a 3Ω small resistor in series at the neutral point of the selected substation. According to the single variable principle, only change the series resistance of one substation to 3.5Ω each time to obtain its sensitivity to the influence of the bias current of other substations;

[0024] (4) Sort the sensitivity of each station in order, select the series resistance of substations in th...

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Abstract

The invention relates to a resistance optimization selection method for restraining DC bias current. The method comprises the following steps: building a simulation model, modeling a calculation gridframe, and calculating the distribution of the DC current in each substation; Select the substation whose DC current is more than 10A to carry out DC bias treatment; the selected substation neural point is serially connected with the 3 omega small resistor, According to the principle of single variable, the resistance of one substation is changed to 3.5 omega at a time, and the sensitivity to thebias current of other substations is obtained. The sensitivity of each substation is sorted in turn, and the series resistance of substation is selected in the order of sensitivity from high to low, and the small resistance of neutral point series connection of each substation is finally determined. The invention can reduce the mutual interference of the series connection resistors of the neutralpoints of each substation, and reduce the total bias current flowing into the AC power network.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission DC bias suppression technology, in particular to a resistance optimization selection method for suppressing DC bias current. Background technique [0002] Under the normal operation state of HVDC and UHVDC transmission, the DC line works in the bipolar operation mode, and the DC current passes through the transmission lines of the two poles to form a loop. However, in the case of system debugging, maintenance or failure, the HVDC transmission will use unipolar How the earth loop works. When the single pole ground loop is in operation, the current field in the ground will have a greater impact on the environment in which the current flows. Since the huge DC current flows into the ground through the DC ground electrode, it will cause a large range of ground potential changes. This kind of ground Changes in potential may affect the AC system in the affected area. Es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 丁国成陈庆涛杨海涛田宇吴兴旺尹睿涵张晨晨赵文彬刘烨
Owner STATE GRID CORP OF CHINA
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