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Inter-node phase relation identification method of electric system based on wide area measurement noise signal

A phase relationship and power system technology, applied in information technology support systems, electrical components, circuit devices, etc., can solve problems such as limited application range and inability to evaluate system characteristics

Inactive Publication Date: 2011-03-30
TSINGHUA UNIV
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Problems solved by technology

However, this type of method can only be used when the power system has obvious oscillations, and cannot evaluate the system characteristics under the normal operating state of the system, so the application range is limited.

Method used

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  • Inter-node phase relation identification method of electric system based on wide area measurement noise signal
  • Inter-node phase relation identification method of electric system based on wide area measurement noise signal
  • Inter-node phase relation identification method of electric system based on wide area measurement noise signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0161] Example: Phase Relationship Analysis between Nodes of the New England Simulation System

[0162] Using the New England simulation system ( figure 2 ) to simulate the real operating conditions of the power system, adopt the method of the invention to process the noise-like signals, and analyze the phase relationship between nodes in the low-frequency oscillation mode.

[0163] Taking the (0.5398Hz, 7.2287%) mode of the New England simulation system as an example, taking node 39 as the reference node, the phase relationship between the main participating nodes and node 39 in this mode obtained by eigenvalue calculation is shown in Table 2.

[0164] Step 1: Inject random small-scale disturbances into the simulated power system, and collect system small-amplitude fluctuation response signals similar to noise signals as analysis objects.

[0165] In order to simulate the small random disturbance in the actual power system, a small random disturbance signal is injected into...

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Abstract

An inter-node phase relation identification method of an electric system based on a wide area measurement noise signal belongs to the technical field of stability analysis of the electric system. The method is characterized by comprising the steps of injecting random small-amplitude disturbing signals at the load position of an artificial electric system, collecting system small-amplitude fluctuation responses of noise-like signals as analysis objects, establishing the autoregressive moving average models of the noise-like signals, calculating the model parameters of the autoregressive parts and the moving average parts of the models, solving for the coefficient of the Green function of an ARMA model similar to system unit pulse response based on the parameters, and identifying the inter-node phase relation according to the relation between a system oscillation modal vector and the coefficient vector of the Green function of the ARMA model. The invention is capable of correctly estimating the dynamic characteristics of the prior system under the condition that the system normally runs, and the signals are easily collected.

Description

technical field [0001] The technical solution relates to a phase relationship identification method between nodes in a power system based on wide-area measurement noise signals, and belongs to the technical field of power system stability analysis. Background technique [0002] With the adoption of the fast excitation system of large-scale units, the continuous expansion and interconnection of the power system scale, the problem of low-frequency oscillation has become increasingly prominent, which seriously threatens the safe and stable operation of the power system. The phase relationship between nodes is an important parameter to characterize the low-frequency oscillation characteristics of the system. Correctly analyzing the phase relationship of each node in the oscillation mode will help realize the grouping of coherent units, and then quickly separate the system when the oscillation is out of step, and improve the reliability of the interconnected power system. Safety ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50H02J3/00
CPCY04S40/22Y02E60/76Y02E60/00
Inventor 陆超吴超韩英铎
Owner TSINGHUA UNIV
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