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Dynamic state evaluation method of generator

A generator dynamic and state estimation technology, which is applied in the direction of motor generator testing, measuring electricity, measuring electrical variables, etc., can solve problems such as deviation of estimation results from actual values, influence of estimation accuracy, failure of dynamic state estimation, etc.

Active Publication Date: 2016-03-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, regardless of UKF or CKF, when there is bad data in the equivalent measurement, the estimation accuracy will be affected to a certain extent, and even cause the estimation result to seriously deviate from the actual value, and the dynamic state estimation fails

Method used

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  • Dynamic state evaluation method of generator

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Embodiment Construction

[0079] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0080] An embodiment of the present invention provides a method for estimating a dynamic state of a generator, which mainly includes the following steps:

[0081] Calculate the dynamic state estimation result of the generator at time k-1 according to the system equation, and obtain the dynamic state estimation result of the generator at the kth time;

[0082] The CKF filter algorithm is used to predict and filter the dynamic state estimation result...

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Abstract

The invention discloses a dynamic state evaluation method of a generator. The method comprises steps of introducing time-varying multi-dimensional observation noise scale factors into CKF dynamic state evaluation; carrying out on-line adjustment on error measurement according to measurement information so as to allow the noise to be closer to actual noise; and using the adjusted errors to calculate filtering gain so as to precisely correct a state quantity predicated value when bad data is measured, thereby obtaining a precise state quantity evaluation value. The invention also provides a specific construction method for the time-varying multi-dimensional observation noise scale factors and provides solutions for abnormity of inversion of filtering gain. In this way, on the premise that requirements on real-time performance are satisfied, effects on dynamic state evaluation of the generator imposed by measurement bad data can be effectively restrained.

Description

technical field [0001] The invention relates to the technical field of power system dynamic state estimation, in particular to a dynamic state estimation method of a generator. Background technique [0002] The emergence of synchrophasor measurement unit (PMU) provides a new technical means for power system transient stability analysis and control. However, in the event of interference, failure of measurement equipment, loss of synchronization signals, etc., it often leads to the appearance of bad data. Bad data may cause the PMU to cause wrong analysis results and control strategies in the application process. State estimation can eliminate the bad data in the quantity measurement, so it is very important to study the dynamic state estimation in the electromechanical transient process of power system based on PMU. [0003] In recent years, the dynamic state estimation of generators in electromechanical transient process based on PMU is a hot spot in the field of power sys...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 毕天姝刘灏袁东泽陈亮薛安成杨奇逊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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