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AC/DC coordinative control method for handling series fault of AC circuit

A technology for AC-DC coordination and severe faults, which is applied in the direction of emergency treatment AC circuit layout, power transmission AC network, etc., to ensure safe operation, improve power supply reliability, and reduce or avoid load shedding.

Active Publication Date: 2016-12-07
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent document CN201410098011 discloses a transient stability emergency control strategy calculation method in which machine cut-off and DC emergency power modulation are coordinated. When a fault causes system instability, the transient stability of the system is improved by machine cut-off and DC emergency power modulation , but it is generally applicable to the sending end grid

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  • AC/DC coordinative control method for handling series fault of AC circuit
  • AC/DC coordinative control method for handling series fault of AC circuit

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Experimental program
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Effect test

Embodiment 1

[0026] The flow direction of the three-circuit 500kV inter-provincial AC tie line is usually from CL to CDB, and from GZB to GS. Since the CL-CDB double-circuit line is erected on the same tower, when the double-circuit line trips at the same time, it is easy to cause the GZB-GS line to be overloaded. Therefore, the stability control device is configured in the substation CDB to detect the running status of the CL-CDB double-circuit line, and the stability control device is configured in the substation GS to detect the power information of the GZB-GS line, and transmits it to the stability control device of the substation CDB. The stability control device is configured in the XTH of the DC converter station to accept the DC power emergency control command sent by the CBD stability control device of the substation.

[0027] In a certain operation mode, the active power sent by GZB to GX is 1200MW, the double-circuit active power sent by CL to CDB is 1600MW, and the DC transmiss...

Embodiment 2

[0030] The HL-AJC double-circuit line near the DC converter station is also erected on the same tower. When the DC transmission power is large, if the HL-AJC double-circuit line trips at the same time, it will easily cause the YT-XC line to be overloaded. Therefore, the stability control device is configured in substation HL to detect the running status of HL-AJC double-circuit line, and the stability control device is configured in substation YT to detect the power information of YT-XC line and transmit it to the stability control device of substation HL. The stability control device configured in the XTH of the DC converter station also accepts the DC power emergency control command sent by the HL stability control device of the substation.

[0031]In a certain operation mode, the DC transmission power is 5300MW, the active power sent by HL to AJC is 1377MW, and the active power sent by YT to XC is 1311MW. When HL-AJC double-circuit line trips at the same time, if no measure...

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Abstract

The invention provides an AC / DC coordinative control method for handling a series fault of an AC circuit. The AC / DC coordinative control method comprises the following steps of 1, monitoring a running state of a common-tower double-circuit line by a stable control device A of a substation at one side of a certain common-tower double-circuit line, simultaneously monitoring power information of an easily-overloaded circuit L by a stable control device C of a substation at one side of the easily-overloaded circuit L, and sending the power information to the stable control device A; 2, sending a DC power emergency control instruction to a stable control device B of a DC converter station when the common-tower double-circuit line is detected to simultaneously trip by the stable control device A and the power of the easily-overloaded circuit L exceeds thermal stable control power thereof; 3, sending the DC power emergency control instruction to a DC control protection system by the stable control device B of the DC converter station; and 4, executing the DC power control instruction by the DC control protection system so that the power of the easily-overloaded circuit L is restored below the thermal stable control power thereof. By means of DC power emergency control, a load switching measure during a fault is reduced or avoided.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability control, and in particular relates to an AC-DC coordination control method for dealing with severe faults of AC lines. Background technique [0002] With the continuous development of power grids and urban construction, transmission corridors are becoming more and more tense. There are more and more cases where double-circuit or even multi-circuit AC transmission lines are erected on the same tower. When affected by bad weather, natural disasters or other external damage, a serious fault occurs in the AC line (the double-circuit line erected on the same tower or in the same corridor trips at the same time), which will cause a large-scale shift of the grid power flow. If the power flow of the AC line is heavy when a fault occurs, it may cause overloading of other operating lines after the fault. In order to ensure the safety of other operating AC lines after a serious fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/001H02J3/36Y02E60/60
Inventor 呙虎陈道君李晨坤向萌张斌沈阳武崔挺
Owner STATE GRID CORP OF CHINA
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