Low-frequency oscillation on-site online identification method based on extended Prony algorithm
A low-frequency oscillation and identification method technology, applied in computing, system integration technology, instruments, etc., can solve the problems of not maximizing the use of power production and transmission capacity, affecting the normal operation of the power system, reducing the system transmission capacity, etc. Software and hardware overhead, reliable original data and data support, fast recognition effect
Active Publication Date: 2015-08-26
NARI TECH CO LTD +3
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Problems solved by technology
During the oscillation process of the power system, the power of the transmission line is transmitted back and forth, which affects the normal operation of the power system and directly reduces the transmission capacity of the system, so that the power production and transmission capacity cannot be fully utilized, and the system will lose synchronization in severe cases.
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[0032] The on-site low-frequency oscillation identification method based on the extended Prony algorithm provided by the present invention: first calculate the active power, the product of voltage and power factor Ucosφ and the current zero-sequence component according to the three-phase voltage and current phasor data calculated by the synchronized phasor measurement device ; Then use Mandani fuzzy logic to judge whether low-frequency oscillation has occurred: if low-frequency oscillation occurs, use Prony algorithm for parameter identification, calculate the amplitude, frequency, attenuation factor, and damping ratio of low-frequency oscillation, and realize low-frequency oscillation on-site Identification, identification speed, high accuracy.
[0033] The present invention will be further described below in conjunction with the accompanying drawings.
[0034] like figure 1 Shown is the flowchart of the inventive method. The in-situ online identification method of low-freq...
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The invention discloses a low-frequency oscillation on-site online identification method based on an extended Prony algorithm, which comprises the steps of computing an active power, a voltage and power factor product Ucosphi and a current zero-sequence component according to three-phase voltage current phasor data that are calculated by a synchronous phasor measuring device; determining whether low-frequency occurs by means of a Mandani fuzzy logic, and if yes, performing parameter identification by means of a Prony algorithm, computing for obtaining amplitude, frequency, damping factor and damping ratio of low-frequency oscillation, thereby realizing on-site online identification for the low-frequency oscillation, and obtaining high identification speed and high accuracy. Software and hardware expenditure at a WAMS main station end can be greatly reduced. Furthermore the low-frequency oscillation on-site online identification method supplies reliable original data and data support for the functions of full-system electric network wide-area monitoring, transformer station automatic measuring and controlling, stable controlling, adaptive relay protecting, etc.
Description
technical field [0001] The invention relates to an on-site low-frequency oscillation identification method based on an extended Prony algorithm, and belongs to the technical field. Background technique [0002] Since the low-frequency oscillation phenomenon was observed during the trial interconnection of the Northwest United System and the Southwest United System of MAPP in North America in the 1960s, with the increasing scale of the power grid, the continuous operation of large-capacity units in the power grid, and the widespread use of fast excitation , the phenomenon of low-frequency oscillation often occurs in large-scale interconnected power grids. The oscillation range caused by low frequency oscillation is usually between 0.1-2.5HZ, and it can generally be divided into local oscillation and interregional oscillation. Local oscillation refers to the vibration of a certain motor or several motors in the area relative to other units in the area. Due to the close electr...
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Login to View More IPC IPC(8): G01R31/08G06F19/00
CPCY02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 檀永沈健周斌张敏侯明国汪昀汪鹤彭奇刘东升
Owner NARI TECH CO LTD