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Method and device for generator out-of-step protection

A technology for out-of-step protection and generators, applied in emergency protection circuit devices, motor generator testing, electrical components, etc., can solve problems such as complex setting and poor quick movement, and achieve good compatibility, low cost, and good engineering practice meaning effect

Inactive Publication Date: 2014-12-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a fast and effective generator out-of-step protection method. In the present invention, the change law of the oscillation center voltage is introduced into the impedance plane, and the change law near the zero crossing point of the oscillation center voltage is reflected on the impedance plane On the basis of this, a new method and device for impedance-type out-of-step protection based on the variation law of the oscillation center voltage is disclosed. poor problem

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  • Method and device for generator out-of-step protection

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] Detailed exemplary embodiments are disclosed below. However, specific structural and functional details disclosed herein are merely for purposes of describing example embodiments.

[0042] It should be understood, however, that the invention is not limited to the particular exemplary embodiments disclosed, but covers all modifications, equivalents, and alternatives falling within the scope of the disclosure. Throughout the description of the figures, the same reference numerals denote the same elements.

[0043] Also, it should be understood that as used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Also it will be understood that when a component or unit is referred to as being “connected” or “coupled” to another component or unit, it can be directly connected or coupled to the other component or ...

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Abstract

The invention provides a method and a device for generator out-of-step protection. The method comprises the steps of A, obtaining the total impedance of a generator to an infinite bus, B, determining the isostatic boundary circle of the impedance plane of the infinite bus according to the total impedance, C, converting the isostatic boundary circle into a isostatic boundary circle on the impedance plane of a generator terminal, D, measuring the impedance of the generator terminal, when the impedance of the generator terminal goes in from the right side of the isostatic boundary circle and out from the left side of the isostatic boundary circle in predetermined time, confirming out-of-step acceleration of the generator and performing out-of-step acceleration protection, and when the impedance of the generator terminal goes in from the left side of the isostatic boundary circle and out from the right side of the isostatic boundary circle in the predetermined time, confirming out-of-step deceleration of the generator and performing out-of-step deceleration protection. According to the method and the device for generator out-of-step protection, the out-of-step faults can be detected in the first period of oscillation and the power swing is excellent.

Description

technical field [0001] The invention relates to the field of power system equipment, in particular to a power system fault diagnosis and processing technology. Background technique [0002] The generator set is one of the important components of the power system. With the development of large generator sets and ultra-high voltage power systems, the number of generator sets continues to increase, and their stand-alone capacity also increases rapidly, and large generator sets are connected with transformers to form a unit. Once the system oscillates, the oscillation center is often located at the generator end. Nearby, it will endanger the safety of generators, transformers and even the entire system. On the other hand, the continuous occurrence of oscillating current will overheat the stator of the large turbogenerator, cause mechanical damage to the end, twist the large shaft, and shorten the operating life. Therefore, starting from the objective requirements of power syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/06G01R31/34
Inventor 王增平鹿伟郑涛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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