Node phase relation identification method of electric system based on wide area measurement noise signal

A power system and wide-area measurement 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

Active Publication Date: 2009-12-23
天津华凯电气有限公司
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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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  • Node phase relation identification method of electric system based on wide area measurement noise signal
  • Node phase relation identification method of electric system based on wide area measurement noise signal
  • Node phase relation identification method of electric system based on wide area measurement noise signal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0171] Example: Phase Relationship Analysis between Nodes of the New England Simulation System

[0172] 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.

[0173] 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.

[0174] Step 1: Inject random small-scale disturbances into the simulated power system, and collect system small-amplitude fluctuation frequency response signals similar to noise signals as analysis objects.

[0175] In order to simulate the small random disturbance in the actual power system, a small random disturbance signal is injec...

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PUM

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Abstract

A 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 small-amplitude random disturbing time sequences at the load position of the electric system, measuring the response time sequence signals of the system, identifying the frequency and damping ratio parameter of a low-frequency oscillation mode by using an autoregressive moving average (ARMA) model, further using a Prony method to estimate the phase information of the node in the low-frequency oscillation mode based on the obtained information of the low-frequency oscillation mode, and synchronously collecting the system responses, namely noise-like signals of a plurality of nodes according to the same steps, and analyzing the phase information of each node in the low-frequency oscillation mode, and finally calculating to obtain the inter-node phase relation in the same low-frequency oscillation mode. The invention is capable of correctly analyzing the dynamic characteristics of the prior system in time under the condition that the system normally runs.

Description

technical field [0001] The technical solution relates to a phase relationship identification method between nodes of 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. Correct analysis of the phase relationship between nodes in the oscillation mode is helpful to 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. Sa...

Claims

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Application Information

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IPC IPC(8): G01R23/16H02J3/00
CPCY04S40/22Y02E60/76Y02E60/00
Inventor 陆超吴超韩英铎
Owner 天津华凯电气有限公司
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