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A DC engineering AC bus split operation control method and reactive power control method, module and system

A technology of AC busbar and DC engineering, which is applied in reactive power compensation, power transmission AC network, reactive power adjustment/elimination/compensation, etc., can solve problems such as false locking of valve groups, reduce valve group locking, and facilitate modularization Configuration, the effect of avoiding the risk of false locking of the valve group

Active Publication Date: 2020-03-20
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The current design principle of bus split operation protection fundamentally has the risk of false locking of the valve group

Method used

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  • A DC engineering AC bus split operation control method and reactive power control method, module and system
  • A DC engineering AC bus split operation control method and reactive power control method, module and system
  • A DC engineering AC bus split operation control method and reactive power control method, module and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] This embodiment is a DC project AC bus split operation control method, including:

[0073] Obtain the operating status of valve groups connected to all AC buses of the DC project, the status of AC filters and the status data of all AC buses;

[0074] Based on the obtained data, it is judged whether the AC bus is in split operation state;

[0075] When the AC bus is in the split operation state, the reactive power control of each AC bus is carried out according to the preset reactive power control strategy based on the operating status of the valve group connected to each AC bus, the status of the AC filter and the status data of the AC bus.

[0076] That is, when the split operation of the AC bus is detected, the operating valve group on the AC bus is not directly blocked, but the reactive power control function is automatically switched from the traditional reactive power control according to the overall reactive power of the DC system of the whole station to the separ...

Embodiment 2

[0089] Based on the same inventive concept as in Embodiment 1, this embodiment can be used to realize the reactive power control function module described in Embodiment 1 that implements the reactive power control strategy, specifically a reactive power control method for an AC busbar in a DC project, including:

[0090] S1, obtaining a preset acquisition signal;

[0091] S2, based on the acquired acquisition signal, perform a control operation according to a preset reactive power control strategy, including;

[0092] In the normal operation state of the AC bus, the overall reactive power control calculation of the DC system of the whole station is carried out;

[0093] Or in the split running state of the AC bus, the overall reactive power control of the DC system of the whole station is switched to the reactive power control calculation of a single AC bus for the preset Xth AC bus;

[0094] S3. Outputting a control signal corresponding to the control calculation result.

...

Embodiment 3

[0108] refer to figure 2 As shown, based on the same inventive concepts as Embodiments 1 and 2, this embodiment is a DC engineering AC bus reactive power control module, including:

[0109] a signal acquisition unit, configured to acquire a preset acquisition signal;

[0110] The control unit includes, for performing control calculations based on the acquired acquisition signals according to a preset reactive power control strategy, including;

[0111] In the normal operation state of the AC bus, the overall reactive power control calculation of the DC system of the whole station is carried out;

[0112] Or in the split running state of the AC bus, the overall reactive power control of the DC system of the whole station is switched to the reactive power control calculation of a single AC bus for the preset Xth AC bus;

[0113] The control signal output unit is configured to output the control signal corresponding to the control operation result.

[0114] Refer to Embodimen...

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Abstract

A DC engineer AC bus splitting operation control method and reactive power control method, module and system are disclosed. The control logic of AC bus splitting operation is: when AC bus splitting operation is detected, the operation valve group on AC bus is not directly locked, and the reactive power control function is automatically switched from the whole reactive power control according to DCsystem of the whole station to the reactive power control according to AC bus separately. That is, according to the operating state of the valve group connected to each AC bus bar, the AC filter state and the AC bus bar state, if the reactive power of the bus bar meets the preset reactive power demand, the operating state of the valve group connected to the AC bus bar and the AC filter state aremaintained; If the reactive power of the bus bar does not meet the preset reactive power demand, the AC filter connected with the corresponding AC bus bar is automatically switched on and off according to the reactive power demand, and the power of the valve block connected with the corresponding AC bus bar or the blocking valve block is returned. The invention can effectively overcome the risk ofmislocking of the valve group existing in the busbar splitting operation protection in the current HVDC transmission project, reduce the valve group locking, effectively guarantee the safety of the electric network and bring practical economic benefits.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a method for controlling split operation of an AC busbar of a direct current project, a reactive power control method, a module and a system in a high-voltage direct current transmission and an ultra-high voltage direct current transmission system. Background technique [0002] In high-voltage direct current transmission projects, in order to ensure the reliability of power transmission, dual AC buses or multiple AC buses are generally used. Taking dual AC buses as an example, bus split operation means that there is no electrical connection between the two AC buses, that is, in the AC field Any AC string or bus tie switch cannot be connected to AC bus I and AC bus II at the same time. [0003] When the bus is split and running, the operating valve group and the AC filter group in the converter station may be on different AC buses, which will cause the input AC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/18
CPCH02J3/18H02J3/36Y02E40/30Y02E60/60
Inventor 王杨正
Owner NR ELECTRIC CO LTD
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