Voltage and current phasor measurement method based on dynamic data window
A voltage, current, and phasor measurement technology, which is applied to measuring devices, measuring electrical variables, and measuring current/voltage, etc., can solve problems such as restricting the action speed of relay protection devices and potential safety hazards in power grids
Active Publication Date: 2013-07-17
STATE GRID CORP OF CHINA +3
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However, the existing relay protection devices need to collect a full cycle of data first, and then use the Fourier algorithm to calculate the entire wave of data to obtain the voltage and current phasors, and then use the voltage and current phasors for various relays. Protection calculation, so that the calculation time for obtaining the voltage and current phasor occupies most of the action time of the relay protection device, which seriously restricts the improvement of the action speed of the relay protection device and brings security risks to the power grid
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[0019] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0020] figure 1 It is a schematic diagram of the power transmission system applying the present invention. figure 1 CVT is a voltage transformer, and CT is a current transformer. In this embodiment, the data processor of the relay protection device collects in real time a group of continuous voltage sampling values u of n+1 at the place where the voltage transformer of the φ-phase transmission line of the substation is installed φ (1), u φ (2), u φ (3), ..., u φ (n), u φ (n+1), and then calculate the real part Re of the voltage phasor where the voltage transformer of the φ-phase transmission line of the substation is installed and the imaginary part Im
[0021] Re ( U · φ ) = - 0.5 ...
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The invention discloses a voltage and current phasor measurement method based on a dynamic data window. The method includes: firstly acquiring a group of continuous voltage sampling values with the quantity of n+1 at the position where a substation phi phase power transmission line voltage transformer is installed and a group of continuous current sampling values with the quantity of n+1 at the position where a substation phi phase power transmission line current transformer is installed, and then utilizing the n+1 voltage sampling values and the n+1 current sampling values to obtain voltage phasor at the position where the substation phi phase power transmission line voltage transformer is installed and current phasor at the position where the substation phi phase power transmission line current transformer is installed through calculation respectively, wherein phi is equal to A, B and C phases. The data window required by the method to calculate the voltage phasor and the current phasor is larger than half a fundamental wave cycle data window and less than a whole fundamental wave cycle data window so as to enable the voltage phasor and the current phasor to be got in the time of any data window between half the fundamental wave cycle data window and the whole fundamental wave cycle data window, and relay protection movement speed is improved.
Description
technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a voltage and current phasor measurement method based on a dynamic data window. Background technique [0002] With the improvement of ultra-high voltage power grid construction and the large-scale construction of UHV AC transmission lines, more and more attention has been paid to the safety of the power grid, and the relay protection device is required to have a faster action speed, which can quickly isolate the fault after the power grid transmission line fails. Make sure the fault doesn't propagate. However, the existing relay protection devices need to collect a full cycle of data first, and then use the Fourier algorithm to calculate a full wave of data to obtain the voltage and current phasors, and then use the voltage and current phasors for various relays. Protection operation, so that the operation time for obtaining the voltage and current...
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Inventor 林富洪曾惠敏
Owner STATE GRID CORP OF CHINA