Method for positioning oscillating source of power system on basis of energy supplied to port

A technology for supplying energy and power systems, applied in the direction of reducing/preventing power oscillations, fault locations, etc., can solve problems such as stretching, achieve accurate positioning, and improve practicability

Active Publication Date: 2012-07-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These difficulties make the traditional way of designing damping controllers based on the negative damping mechanism more difficult to cope with the low-frequency oscillations of large-scale interconnected power grids.

Method used

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  • Method for positioning oscillating source of power system on basis of energy supplied to port
  • Method for positioning oscillating source of power system on basis of energy supplied to port
  • Method for positioning oscillating source of power system on basis of energy supplied to port

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Experimental program
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Effect test

Embodiment 1

[0034] The present invention introduces a port-controlled Hamiltonian (Port-Controlled Hamiltonian, PCH) system, realizes the dissipation Hamiltonian of the multi-machine network model, and then defines the energy supply on the port (Energy Supply on Port, ESP) as the judgment of the oscillation source. In this way, while effectively locating various oscillation sources, the decentralization and localization of the positioning problem can be realized, which greatly improves the practicability of the positioning algorithm.

[0035] In the mathematical model of the present invention, the generator adopts a third-order model, the load adopts a constant power model, and the inlet of each generator connected to the external system is used as the port where the possible oscillation source is located. This model consideration can minimize the dependence on the level of detail of the model while ensuring that the positioning algorithm is applicable to the generator network containing v...

Embodiment 2

[0045] The IEEE118 node system is used to test the effectiveness of the proposed oscillation source location method based on port supply energy in forced oscillation.

[0046] The IEEE118 node includes 54 generators, the topological wiring diagram is attached figure 2 shown. Add governors with typical parameters to generators 2 to 4, and perform characteristic analysis to obtain an interval oscillation mode frequency of 0.72Hz (4.52rad / s). The modal diagram is shown in the attached image 3 shown.

[0047] A periodic sinusoidal interference with an amplitude of 0.1p.u. and a frequency of 0.72Hz is added to the generator 1, which makes the system forced to oscillate. Figure 4 The active oscillation waveform on line 8-30 is given.

[0048] Select the analysis period as [20, 30] seconds, preprocess the collected measurement signals, and then calculate the port supply energy of each generator according to formula (3). The calculation results are shown in the attached Figure...

Embodiment 3

[0051] Two areas, four machines and eleven nodes system (topological wiring diagram is attached) Figure 6 As shown), construct a negative damped oscillation of the system caused by the abnormality of the governor parameters to verify the effectiveness of the positioning algorithm proposed in the present invention for positioning the position with the strongest damping effect on the oscillation mode in the negative damped oscillation.

[0052] Install water turbine governors with typical parameters on generators 2 to 4 of the four-machine system. At this time, the system interval oscillation mode is well damped. Then, after installing a water turbine governor with modified parameters on generator 1, The damping of the system interval oscillation mode is reduced to 0. A three-phase-to-ground short-circuit fault is applied at node 5 for 0.1 second to obtain a negative damped oscillation, with Figure 7 The active power oscillation waveform of tie line 8-9 in oscillation is show...

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Abstract

The invention discloses a method for positioning an oscillating source of a power system on the basis of energy supplied to a port in the technical field of small interference stability analysis and control of the power system, which comprises the following steps of: initializing mechanical damping of each generator; obtaining measurement sampling values in a set time period; preprocessing the measurement sampling values; respectively calculating the energy supplied to the port of each generator; according to the energy supplied to the port of each generator, judging the position of the oscillating source. According to the invention, the accurate positioning of the oscillating source of the power system is implemented; and meanwhile, the problem for positioning the oscillating source is decentralized and localized and the practicality of a positioning algorithm is improved.

Description

technical field [0001] The invention belongs to the field of power system small disturbance stability analysis and control technology, and in particular relates to a low-frequency oscillation online analysis and control technology. Background technique [0002] In modern large-scale interconnected power systems, low-frequency oscillations are the most restrictive factor for the power transmission capacity of interconnected regional grids because they may cause large-scale tie-line power oscillations. As the scale of the interconnected grid continues to increase, the difficulty of the low-frequency oscillation problem is also increasing: the grid model is more complex, the scale is larger, the model parameters are more difficult to obtain, and the operation mode is more variable. These difficulties make the traditional way of designing damping controllers based on negative damping mechanism more difficult to deal with low-frequency oscillations of large-scale interconnected p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24G01R31/08
Inventor 沈沉李颖刘锋魏韡
Owner TSINGHUA UNIV
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