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A method and system for calculating transient voltage

A technology of transient voltage and calculation method, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of inaccurate calculation of fault transient voltage, complex calculation process, and large amount of calculation, and achieve online real-time calculation. , the effect of increasing the calculation rate and increasing the calculation speed

Active Publication Date: 2021-11-02
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of inaccurate calculation of fault transient voltage in the prior art, and the calculation process is complicated, and the calculation amount is large and time-consuming, the present invention provides a calculation method and system for transient voltage

Method used

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  • A method and system for calculating transient voltage
  • A method and system for calculating transient voltage
  • A method and system for calculating transient voltage

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Experimental program
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Effect test

Embodiment 1

[0048] Such as figure 1 As shown, in order to achieve the purpose of the above invention, the present invention proposes a calculation method for transient voltage, including:

[0049] Step S1, obtaining the voltage value of the bus bar of the converter station, the reactive power exchange amount of the converter station, and the external equivalent reactance of the bus bar of the converter station, and using the voltage value of the bus bar of the converter station as a DC fault transient voltage value;

[0050] Step S2, performing iterative calculation based on the DC fault transient voltage value and a pre-built calculation formula for DC fault transient voltage rise / drop to obtain a DC fault transient voltage value.

[0051] This method can quickly solve the calculation value of the transient voltage of the large power grid after the DC system fault, and improve the accuracy of the power flow calculation results.

[0052] Among them, the pre-built DC fault transient volta...

Embodiment 2

[0083] This embodiment takes a converter station in a certain place as an example to calculate the DC fault transient voltage value, including:

[0084] Cause transient voltage changes, the actual fault transient overvoltage calculation process is as follows:

[0085] Before the fault, the reactive power exchange amount of a converter station in a certain place is

[0086]

[0087] Then: X c =85.3080

[0088] Since the transient overvoltage calculation program adopts an iterative algorithm, where U n is the transient voltage value of the nth iteration, X c is the equivalent reactance of the converter station, ΔQ n It is the reactive power exchange amount of the nth iteration.

[0089] According to the current power grid operation mode, the Thevenin equivalent of the converter station is performed, and the external equivalent reactance of the 500kV bus

[0090] X=10.7586

[0091] In this way, the simulation process is carried out according to the DC fault, and the fil...

Embodiment 3

[0095] Based on the same inventive concept, this embodiment also provides a transient voltage calculation system, including:

[0096] The obtaining module is used to obtain the voltage value of the bus bar of the converter station, the reactive power exchange amount of the converter station, and the external equivalent reactance of the bus bar of the converter station, and use the voltage value of the bus bar of the converter station as a DC fault transient voltage value;

[0097] An iteration module, configured to perform iterative calculation based on the DC fault transient voltage value and a pre-built DC fault transient voltage rise / drop calculation formula to obtain a DC fault transient voltage value.

[0098] In an embodiment, the iteration module includes:

[0099] The first iteration unit is used to obtain the calculated formula based on the DC fault transient voltage rise / voltage drop, the DC fault transient voltage value, the reactive power exchange amount of the con...

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Abstract

The present invention provides a calculation method and system for transient voltage, comprising: obtaining the voltage value of the bus bar of the converter station, the reactive power exchange amount of the converter station, and the external equivalent reactance of the bus bar of the converter station, and converting the bus bar of the converter station to The bus voltage value is used as the DC fault transient voltage value; the DC fault transient voltage value is obtained by iterative calculation based on the DC fault transient voltage value and the pre-built DC fault transient voltage rise / voltage drop calculation formula. The method improves the calculation accuracy of the fault transient voltage, and enhances the practicability of the algorithm under the premise of ensuring the calculation accuracy, and has outstanding practical application value.

Description

technical field [0001] The invention relates to the field of power system automation, in particular to a calculation method and system for transient voltage. Background technique [0002] In recent years, with the centralized production of UHV AC-DC transmission projects, the long-distance transmission capacity has increased significantly, and the grid structure has undergone major changes. Accuracy puts forward higher requirements. Among them, the system transient voltage caused by DC commutation failure, restart or DC blocking will have a huge impact on the power transmission equipment and system stability. In severe cases, it may cause the wind turbine to go off-grid, and the wind turbine off-grid will not be conducive to the safe and stable operation of the system. . After the large-scale power loss of the system, the AC filter was not removed immediately, resulting in a transient overvoltage. Currently, the power flow calculation algorithm does not consider the above-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 冯长有马超马晓忱王轶禹孙博王晶王磊暴英凯韦尊董时萌刘金波常乃超嵇士杰王治华宋旭日
Owner CHINA ELECTRIC POWER RES INST
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