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

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

Inactive Publication Date: 2009-12-23
TSINGHUA UNIV
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  • Application Information

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

[0163] Taking the (0.5398 Hz, 7.2287%) mode of the New England simulation system as an example, taking node 39 as a 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 small random disturbances into the simulated power system, and collect the small fluctuation response signals of the system similar to noise signals as the analysis object.

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

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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 method for identifying the phase relationship 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 rapid excitation system of large units, the continuous expansion and interconnection of power systems, 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 that characterizes the low-frequency oscillation characteristics of the system. Correct analysis of the phase relationship of each node in the oscillation mode is helpful to realize the group of co-tuning machines, and then quickly split the system when the oscillation is out of step, and improve the interconnected power system. Safety and reliability. [0003] Th...

Claims

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Application Information

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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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