Frequency measuring method for multi-frequency oscillation of electrical power system
A frequency measurement and power system technology, which is used in the field of parameter identification of AC transmission systems, and can solve problems such as only single frequency measurement.
Inactive Publication Date: 2015-05-20
CHINA SOUTHERN POWER GRID COMPANY +1
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[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a frequency measurement method for multi-frequency oscillation of the power system, aiming at solving the problem that the prior art can only measure a single frequency
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[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0019] The present invention samples the voltage signal in the power grid at fixed time intervals, and each group of sampling samples 2n+1 points of the signal continuously to form a group, and performs n groups of sampling to obtain n groups of sampling values; each group of sampling values is divided into Combining specific rules; introducing the frequency measurement factor corresponding to each frequency component; using the conversion matrix constructed by the frequency measurement factor and the triangular identity transformation to realize the stripping of each frequency component; strippin...
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The invention discloses a frequency measuring method for multi-frequency oscillation of an electrical power system. The frequency measuring method for the multi-frequency oscillation of the electrical power system includes steps that (1) sampling n groups of voltage signals in a power grid according to a time interval Ts to obtain n groups of sampled values, wherein each group comprises (2n+1) voltage signals; (2) combining 2n+1 elements in the i group of sampled values to obtain n+1 elements and forming an (n+1)*1 matrix; after traversing 1, 2, ..., n, obtaining n (n+1)*1 matrices X(k); (3) extracting the first element of each matrix in the n (n+1)*1 matrices X(k) to form a 1*n matrix; (4) removing the first element from the (n+1)*1 matrix X(k), using the surplus n elements to form an n*1 matrix, and forming an n*n matrix through n n*1 matrices; (5) multiplying the 1*n matrix X1 by the inverse of the n*n matrix X' to obtain a 1*n matrix; forming an n equation with one unknown FORMULA (shown in the description) according to the 1*n matrix and a frequency measuring factor sv; (6) obtaining n solutions s'v according to the n equation with one unknown FORMULA (shown in the description), and obtaining n measuring frequencies according to FORMULA (shown in the description). The frequency measuring method for the multi-frequency oscillation of the electrical power system is capable of obtaining all the frequencies in the electrical power system.
Description
technical field [0001] The invention belongs to the technical field of parameter identification of an AC power transmission system, and more particularly relates to a frequency measurement method for multi-frequency oscillation of a power system. Background technique [0002] With the gradual development of UHV trans-regional large power grids in my country and the continuous expansion of interconnected power grids, power system oscillation accidents occur from time to time. When the transmission power of the transmission line exceeds the limit value, a short-circuit fault occurs in the power grid, the ring system (or parallel double-circuit line) suddenly opens the loop, the large-capacity unit trips or loses excitation, and the asynchronous closing of the power supply fails to be dragged into synchronization, etc. It may cause different degrees of oscillation in the power system. [0003] When the complex power system oscillates, multiple oscillating frequencies may appea...
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IPC IPC(8): G01R23/02
Inventor 文安吴梓亮赵曼勇田霖莫天文黄维芳于芮技李银红
Owner CHINA SOUTHERN POWER GRID COMPANY