Alternating current channel transmission capacity optimization method and device in alternating current/direct current hybrid power system

A technology of AC-DC hybrid and power transmission capability, applied in circuit devices, AC network circuits, electrical components, etc., can solve the problems of small safety and stability margin of AC-DC hybrid power grid, weak AC channel impact, generator group oscillation, etc. Achieve the effect of optimizing the transmission capacity of the AC channel

Active Publication Date: 2018-02-23
CHINA ELECTRIC POWER RES INST +2
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) Limiting DC transmission power: Due to the large transmission power of the current DC transmission system, the fluctuation of the transmission power of the DC transmission system will have a great impact on the weak AC channel
[0006] Faults such as commutation failure in the DC transmission system may lead to severe oscillations between generator groups, which in turn will cause a decrease in the commutation bus voltage in the AC system at the sending end, affect the recovery characteristics of the transmission power of the DC transmission system, and cause another impact on the weak AC channel, resulting in The safety and stability margin of the AC-DC hybrid power grid is small, which seriously limits the transmission capacity of the AC channel

Method used

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  • Alternating current channel transmission capacity optimization method and device in alternating current/direct current hybrid power system
  • Alternating current channel transmission capacity optimization method and device in alternating current/direct current hybrid power system
  • Alternating current channel transmission capacity optimization method and device in alternating current/direct current hybrid power system

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Embodiment 1

[0075] Embodiment 1 of the present invention provides a method for optimizing the transmission capacity of the AC channel in the AC-DC hybrid power grid. The specific flow chart of the optimization method is as follows figure 1 As shown, the specific process is as follows:

[0076] S101: According to the dynamic response curve of the AC-DC hybrid power grid, the two-machine equivalent is performed on the AC system at the sending end, and the leading generator group and the lagging generator group are obtained;

[0077] S102: According to the leading generator group and the lagging generator group obtained in S101, the Thevenin equivalent is performed on the AC / DC hybrid grid from the DC side;

[0078] S103: Adjust the operation mode of the AC / DC hybrid grid according to the Thevenin equivalent result of the AC / DC hybrid grid obtained in S102.

[0079] In the above S101, according to the dynamic response curve of the AC-DC hybrid power grid, the two-machine equivalent is perfo...

Embodiment 2

[0119] In view of some faults in the actual operation of the AC-DC hybrid power grid, after some faults stimulate the cluster oscillation in the AC system at the sending end, affected by the swing, the voltage of the DC commutation bus drops, which will cause the transmission power of the DC transmission system to collapse during the recovery process. Again, the problem of the AC channel is impacted. Based on the structure of the Sichuan power grid, Embodiment 2 of the present invention provides an optimization method for the transmission capacity of the AC channel in the AC-DC hybrid power grid. The impact of secondary shocks and the transmission capacity of important weak sections, the specific process is as follows:

[0120] The power grid includes six power grid areas: Southwest Power Grid, Central China Power Grid, North China Power Grid, East China Power Grid, Northwest Power Grid and Northeast Power Grid. Among them, Southwest Power Grid and Central China Power Grid are ...

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Abstract

The invention provides an alternating current channel transmission capacity optimization method and device in an alternating current/direct current hybrid power system. The method comprises the stepsthat double-machine equivalence is carried out on a transmission-side alternating current system according to the dynamic response curve of an alternating current/direct current hybrid power grid, soas to acquire a leading generator group and a hysteresis generator group; Thevenin equivalence is carried out on the alternating current/direct current hybrid power grid from the direct current side according to the leading generator group and the hysteresis generator group; and finally the operation mode of the alternating current/direct current hybrid power grid is adjusted according to the Thevenin equivalence result of the alternating current/direct current hybrid power grid; and the alternating current channel transmission capacity is optimized in the direct current hybrid power grid. According to the invention, the problem that an alternating current channel is impacted by the collapse of the transmission power of a direct current transmission system during a recovery process and thevoltage drop of a direct current conversion bus after the generator group oscillating aroused by certain faults in the transmission-side alternating current system is solved; and reference is provided for a power grid operator to arrange the operation mode of the alternating current/direct current hybrid power grid reasonably to ensure safe and stable operation of the alternating current/direct current hybrid power grid.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method and device for optimizing the transmission capacity of an AC channel in an AC-DC hybrid power grid. Background technique [0002] At present, my country's AC-DC hybrid grid has begun to take shape. Due to the interaction between the DC transmission system and the AC system, the AC-DC hybrid grid has become complicated. The safety and stability characteristics of the AC-DC hybrid grid are undergoing profound changes. The coupling characteristics between the DC transmission system and the AC system have not yet been clearly understood, especially as the characteristics of the dense transmission of the multi-circuit DC transmission system and the feed-in of the multi-circuit DC transmission system to the AC system at the receiving end have become increasingly prominent, the large-capacity DC transmission system The dynamic characteristics of the AC-DC hybrid grid have a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 顾卓远刘楠张健
Owner CHINA ELECTRIC POWER RES INST
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