Electric power system synchronism loss judging and synchronism loss oscillation center positioning methods based on wide area bus information
A power system and oscillation center technology, which is applied in the field of out-of-step judgment and out-of-step oscillation center positioning, and can solve problems such as difficulty in engineering applications and no separation criteria given.
Active Publication Date: 2016-03-02
NARI TECH CO LTD +1
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Problems solved by technology
Researchers have conducted preliminary research on the out-of-synchronization judgment by using the phasor relationship of the busbar voltage at both ends of the line. Since they ignored the situation that the oscillation center just migrated to the busbars at both ends, they did not give a perfect separation criterion, and it was difficult to realize engineering applications.
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[0023] The present invention will be described in further detail below with reference to the accompanying drawings and examples.
[0024] image 3 It is a flowchart of the method of the present invention. Depend on image 3 As can be seen, the inventive method mainly contains following 4 steps:
[0025] The first step is to divide the bus voltage phase difference into 6 areas in 4 quadrants. Specifically, the bus voltage phase difference is divided into 6 areas in 4 quadrants, where 0o~ φ 1 Between is zone I, φ 1 Between ~90o is zone II, between 90o~180o is zone III, between 180o~270o is zone IV, between 270o~ φ 2 Between is the V zone, φ 2 Between ~360o is the VI area. φ 1 is the first phase difference limit value, φ 1 ∈(0o,90o), φ 2 is the second phase difference limit value, φ 2 ∈(270o,360o), it can be determined according to the actual engineering situation. The division result obtained is as figure 1 shown. Practice, φ 1 The value of is usually 45o...
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The invention discloses electric power system synchronism loss judging and synchronism loss oscillation center positioning methods based on wide area bus information, belongs to the technical fields of electric power systems and automation thereof, and especially relates to the field of synchronism loss islanding control. According to the invention, transformer station bus voltage phase information in an electric power system is practically measured, a transformer station bus voltage phase difference between two sides of a line and a wide area bus voltage phase difference are utilized to judge whether the system is out of synchronism, and the area of a synchronism loss oscillation center is positioned. By adopting the methods, system synchronism loss effective identification and oscillation center positioning are realized when the synchronism loss oscillation center is on a transformer station bus, so that a technical support is provided for the application of wide area information to synchronism loss islanding control.
Description
technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a method for judging out-of-step and locating the center of out-of-step oscillation. Background technique [0002] In accordance with the requirements of the national standard "Guidelines for Safety and Stability of Electric Power Systems", the power system in operation must be equipped with de-loading points at appropriate locations and equipped with automatic de-loading devices. When the power system enters an extreme emergency state, a planned disconnection can be implemented when the system cannot maintain stability. "Power System Safety and Stability Control Causes" stipulates that the general method to eliminate the out-of-step state is to use the out-of-step de-coupling control, and de-coupling the system at an appropriate system section. [0003] Traditional out-of-synchronization decoupling control usually de...
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IPC IPC(8): G01R31/08
Inventor 刘福锁方勇杰吴雪莲李威
Owner NARI TECH CO LTD