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Fault location method for double-terminal DC distribution network based on current adaptive control

A technology of adaptive control, DC distribution network, applied in the direction of adaptive control, fault location, electric controller, etc., can solve the problems of inability to ignore transition resistance, uneven distribution of line parameters, numerical stability problems, zero-crossing points, etc. , to achieve the effect of improving fault location accuracy, improving accuracy and reducing adjustment time

Active Publication Date: 2022-08-02
SOUTHEAST UNIV
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Problems solved by technology

However, the effects of transition resistance, uneven distribution of line parameters and calculation errors of differential terms cannot be ignored
The double-ended method can eliminate the influence of the transition resistance on the ranging accuracy, and use the information of each sampling point to calculate the fault distance once, but the denominator term introduced by the double-ended method will appear zero-crossing, which brings numerical stability problems

Method used

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  • Fault location method for double-terminal DC distribution network based on current adaptive control
  • Fault location method for double-terminal DC distribution network based on current adaptive control
  • Fault location method for double-terminal DC distribution network based on current adaptive control

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Embodiment

[0042] see Figure 1 to Figure 7 As shown, the fault location method of double-terminal DC distribution network based on current adaptive control, the constructed double-terminal DC distribution network simulation model is as follows figure 1 shown.

[0043] Both converter station 1 and converter station 2 adopt a semi-full hybrid structure, and the proportion of the full bridge is 50%. In steady state, converter station 1 is set as the master station and works in constant voltage mode, and converter station 2 is the slave station. , work in constant active power mode.

[0044] Fault location verification:

[0045] After the single-pole grounding fault occurs in the DC line, the system can still run for a period of time. The present invention analyzes the fault location principle of the most common and most harmful bipolar short-circuit fault in the DC line.

[0046] The voltage and current flow paths of the system after a bipolar short-circuit fault occurs on the DC side are...

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Abstract

The invention discloses a method for locating faults in a double-terminal direct current distribution network based on current adaptive control, characterized in that the method for locating faults includes the following steps: step S1: constructing a model of a double-terminal flexible direct current distribution network; step S2: fault detection and countermeasures; step S3: system sampling; step S4: obtaining a calculation formula; step S5: calculating the final fault distance. The fault location method of the present invention uses the double-end method to eliminate the transition resistance, has a high resistance to the interference of the transition resistance, adopts the fault current adaptive control, and extracts the actual fault current at the moment of switching the control mode as the peak value of the reference signal, and the zero-crossing point of the reference signal is still It can greatly reduce the adjustment time of PI and improve the accuracy of active current control. The numerator and denominator univariate linear regression analysis of the traditional double-ended fault location method can effectively reduce the error between different sampling points and greatly improve the fault location accuracy. .

Description

technical field [0001] The invention relates to a fault detection technology for a flexible direct current distribution network, in particular to a fault location method for a double-ended direct current distribution network based on current self-adaptive control. Background technique [0002] In recent years, with the development of power electronics technology, the flexible DC distribution network can realize the independent control of active and reactive power, large power transmission capacity, and reduce the distribution of photovoltaic, wind power, etc. The intermediate link of the power supply and DC load access to the power grid, further reducing the access cost, improving the power conversion efficiency and improving the power quality and other advantages have become an important development direction of urban intelligent power distribution in the future. [0003] The flexible DC power distribution projects that have been built so far mostly use cable lines with low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G05B13/02G05B11/42G05F1/46G06F17/18
CPCG01R31/086G01R31/088G05B13/02G05B11/42G05F1/46G06F17/18
Inventor 梅军张丙天朱鹏飞严凌霄陈萧宇张森雷刘鹏
Owner SOUTHEAST UNIV
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