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A self-adaptive emergency load shedding method based on voltage drop amplitude

A voltage sag, load shedding technology, applied in AC network voltage adjustment, power network operating system integration, information technology support systems, etc. Frequency stability and voltage stability, the effect of avoiding voltage collapse

Active Publication Date: 2016-06-29
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The voltage collapse forces all loads in the area to be blacked out, and may even extend to a loss of synchronization between several parts of the system, causing asynchronous oscillations, causing system-wide accidents, and loss of more loads
[0003] At present, low-voltage load shedding has been widely used to avoid blackouts caused by voltage collapse, but the design process of low-voltage load shedding mainly adopts traditional solutions, that is, setting a certain threshold and delay, when the voltage drops below the threshold After a certain delay, the load is removed according to a certain ratio. This scheme uses local voltage response information, which belongs to decentralized voltage control, and does not take into account the frequency response of the system. It is independent of low-frequency load shedding, and it is not fully Considering the time-space distribution characteristics of the voltage of each load node after a large disturbance occurs in the system, it is often impossible to effectively control the system state, and even after load shedding, frequency or voltage collapse still occurs

Method used

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  • A self-adaptive emergency load shedding method based on voltage drop amplitude
  • A self-adaptive emergency load shedding method based on voltage drop amplitude
  • A self-adaptive emergency load shedding method based on voltage drop amplitude

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Embodiment Construction

[0027] Such as Figure 1-4 and Figure 8 As shown, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific examples.

[0028] The present invention takes the IEEE39 node system as an example, considers the generator voltage regulator and the governor, the load adopts a 70% induction motor and a 30% constant impedance parallel model, and the motor considers the electromagnetic transient process of the rotor, and performs simulation on the PSASP. The step size is set to 0.01 seconds, and the duration is set to 10 seconds. From the simulation software, the original power output of the system is 6141.208MW, and the active power of the load is 6097.5MW.

[0029] Set the failure mode to 0.5 seconds figure 1 Unit 31 in the shown IEEE39 node system tripped, and the two adjacent lines 6-11 and 4-14 were disconnected at the same time. After the fault, the active output of the system was 5621.208MW, and the active power...

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Abstract

The invention discloses a method for self-adaptive emergency load shedding based on the voltage drop amplitude, which includes calculating the voltage drop amplitude of each load node in the whole network; sorting each load node according to the voltage drop amplitude; sorting the sorted load Nodes are removed in order of voltage drop amplitude from large to small, until the total load shedding is equal to the active power deficit of the whole network, then the load shedding is completed. The present invention fully considers the transient voltage response of the power system. Compared with the existing load shedding method, the present invention can more quickly and effectively select weak buses in the power grid for load shedding, and the number of selected load shedding locations can be determined according to The actual situation of the power grid and the size of the active power deficit when a fault occurs fully consider the time-space distribution characteristics of the voltage of each load node after a large disturbance in the system, effectively control the system state, avoid voltage collapse, and protect the power system. frequency stability and voltage stability.

Description

technical field [0001] The invention relates to the technical field of self-adaptive emergency load shedding by using voltage response information, in particular to a method for self-adaptive emergency load shedding based on voltage drop amplitude. Background technique [0002] When the power system is in normal operation, the reactive power output of the power supply is balanced with the reactive power consumption of the load and the reactive power loss of the network. If there is a shortage of power supply or reactive power compensation capacity, the load terminal voltage is forced to drop. When the voltage drops to a certain critical value, the voltage value continues to drop and cannot be recovered, which is a voltage collapse. The voltage collapse forces all loads in the area to be blacked out, and may even extend to a loss of synchronization between several parts of the system, causing asynchronous oscillations, causing system-wide accidents, and loss of more loads ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 余晓鹏张保会郝治国张振安李晔雷俊哲杨浩刘巍
Owner STATE GRID CORP OF CHINA
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