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A real-time emergency control method for voltage and power angle stability based on response information

A technology that stabilizes the power angle and responds to information. It is applied in information technology support systems, AC network voltage adjustment, and power network operating system integration. It can solve the lack of reliability of small-probability accidents, affect the accuracy of calculation results, and control quantity mismatch and other issues, to achieve the effect of improving the level of safe and stable operation, reliable judgment results, and reliable calculation results

Active Publication Date: 2016-01-20
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control strategy has two main deficiencies: (1) It is impossible to exhaustively list the operation mode and expected faults during offline calculation, and there may be mismatches in actual operation, poor adaptability, and lack of reliability in dealing with small-probability accidents ; (2) In the offline calculation process, there are inevitably some deviations in the grid model and parameters, which affect the accuracy of the calculation results to a certain extent, and there is a risk of mismatching control quantities

Method used

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  • A real-time emergency control method for voltage and power angle stability based on response information
  • A real-time emergency control method for voltage and power angle stability based on response information
  • A real-time emergency control method for voltage and power angle stability based on response information

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Embodiment 1

[0060] The present invention provides a flow chart of Embodiment 1 of a real-time emergency control method for voltage and power angle stability based on response information. figure 2 as shown,

[0061] In step 2, the method for judging whether the system loses power angle stability according to the system speed difference Δω and power angle difference δ is as follows: if the system is a multi-machine system, the system is transformed into a single-machine infinite system after performing double-machine equivalent; when the system When there is an increasing trend, it is judged that the system will lose power angle stability.

[0062] From the energy point of view of the system, whether the power system will maintain power angle stability essentially reflects whether the unbalance injected during the system fault can be digested, and whether the system can maintain synchronous operation depends on whether it can absorb the accumulated power during the transient period. Unb...

Embodiment 2

[0084] Embodiment 2 of the present invention provides a real-time emergency control method for voltage and power angle stability based on response information is a specific embodiment of the application of the real-time emergency control method, such as Figure 6 Shown is a system structural diagram of an embodiment of the application of the real-time emergency control method provided by the present invention, consisting of Figure 6 It can be seen that the system is a New England system with 10 machines and 39 nodes, all generators adopt the classical subtransient model, and the excitation system is considered. An instantaneous three-phase ground short-circuit fault occurred on bus 24, and the fault existed for 0.1s. The line between bus 15 and bus 16 was cut off at 0.1s due to switch malfunction. The system response curve at this time was obtained by simulation.

[0085] The first step: collect the power angle and speed of the generator in the power system, the voltage and cur...

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Abstract

The invention provides a stable, real-time and emergent voltage and power angle control method based on a response message. The method comprises steps as follows: step 1, a power angle quantity and a rotation speed quantity of an electric generator in an electrical power system as well as voltage and current amount of an important load bus of a receiving system are acquired in real time; step 2, power angle stability and voltage stability of the system are monitored in parallel simultaneously, the step 3 is executed when the system loses the power angle stability, the step 4 is executed when the system loses voltage stability, and the step 1 is executed when the system is stable; step 3, a retardation area Sc which should be increased to the system is calculated by utilizing a fit power characteristic curve, a generator-shedding measurement amount is determined, and the step 1 is executed; and step 4, the bus voltage amplitude is used as an evidence for judging the severity of voltage instability, the bus load shedding amount is determined according to the difference of the severity of voltage instability, and the step 1 is executed. The provided real-time and emergency control method adopts a parallel judgment manner, so that a stable, real-time and emergency control scheme of voltage and the power angle of an electrical power system is constructed.

Description

technical field [0001] The invention relates to the field of power system operation and control, in particular to a real-time emergency control method for voltage and power angle stability based on response information. Background technique [0002] The shape of the power grid is becoming more and more complex, the mode of operation is changing, and the problem of safety and stability is becoming more and more prominent. How to build a safe and reliable comprehensive defense system for the power system, reduce the risk of large-scale power outages, and ensure the safe and stable operation of the power system is in front of electric power researchers. a difficult problem. [0003] The safety and stability control system to ensure the safe and stable operation of the power grid is the second line of defense for the safety and stability control system (passive safety) of the power system. At present, the control strategy of "offline decision-making and real-time matching" is wi...

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 汤涌顾卓远易俊
Owner STATE GRID CORP OF CHINA
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