Power grid circuit wide-area current protection method
A technology of current protection and wide-area backup protection, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as insufficient sensitivity, complex backup protection coordination, and inability to track changes in the operation mode of the power system, and achieve protection action speed. quick effect
Inactive Publication Date: 2014-10-08
STATE GRID CORP OF CHINA +3
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Benefits of technology
This technology uses an electricity network's normal measuring equipment (power grids) to measure electrical voltages at different locations throughout its length. By analyzing these measurements it becomes possible for protective devices such as relays or circuit breakers to detect any abnormalities that may occur during fault conditions before they damage their components. These systems are designed specifically for specific types of failures where there could have been multiple occurrences over several hours ago. They also work quickly enough even while still being able to accurately determine whether certain lines were affected due to factors like weather or other external influences. Overall this innovative approach allows for more efficient and reliable monitoring of large areas of transmission networks.
Problems solved by technology
This patents discusses various technical problem areas related to protective relays used during transmission line failures such as overcurrent events. These devices are designed with specific functions that aim at ensuring reliable operations while minimized impact upon other parts of an electric circuit's operating condition. However, these conventional methods often require extensive reconfiguration efforts before they work properly. Additionally, current methodologies lack flexibility when selecting between different types of protections depending on their importance within each section of the entire power grid being monitored.
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[0018] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0019] figure 1 It is an overall design scheme for applying the wide-area current protection of power grid lines of the present invention. The wide-area backup protection system uses the existing wide-area measurement system of the power grid to realize the synchronous measurement of the voltage and current phasors of each substation in the power grid, and obtains the synchronous data of the power grid in real time.
[0020] If the circuit breakers at both ends of the line ij trip, the wide-area backup protection system calculates the admittance change matrix M(M T Y -1 M-z ij ) -1 m T .
[0021] Among them, z ij is the line impedance of line ij; M=[0 ... 1 ... -1 ... 0] T It is an n×1-dimensional matrix, the element in the first column of the i row in the M matrix is 1, the element in the first column of the j row in the M matrix is -1,
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The invention discloses a power grid circuit wide-area current protection method. The method includes the first step of synchronously measuring the voltage phasor and current phasor of each transformer substation of a power grid through an existing wide-area measuring system of the power grid so as to obtain power grid synchronous data; the second step of calculating an admittance variation matrix through a wide-area backup protection system when single-circuit trip of the power grid occurs, and further calculating a voltage variation matrix of each transformer substation and the current variation of each circuit after the single-circuit trip of the power grid occurs; the third step of establishing a current protection criterion according to the calculated circuit current variation and the circuit current variation measured through the existing wide-area measuring system. According to the power grid circuit wide-area current protection method, the function of protecting the power grid circuit wide-area current after the single-circuit trip occurs is achieved through the existing wide-area measuring system of the power grid; when the topological structure of the power grid changes after the single-circuit trip of the power grid occurs, the variation of current which flows through each circuit after the single-circuit trip of the power grid occurs can be directly calculated without modifying the power grid admittance matrix, and the whole calculation process can be completed within 200 microseconds.
Description
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