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Hyper-real-time setting method for superposed time sequences based on transient voltage safety margin

A safety margin, coincidence timing technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as fault location mismatch

Inactive Publication Date: 2014-11-05
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a super real-time coincidence sequence setting method based on the safety margin of transient voltage, which utilizes the least square method and the improved Euler method to predict the trajectory of node voltage changes, optimizes the coincidence scheme, and solves the operation problem while improving the prediction accuracy. The problem of mismatching mode and fault location

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  • Hyper-real-time setting method for superposed time sequences based on transient voltage safety margin
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  • Hyper-real-time setting method for superposed time sequences based on transient voltage safety margin

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[0095] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the protection scope of the present invention is not limited to the content.

[0096] like Figure 4 As shown, this ultra-real-time reclosing sequence setting method based on transient voltage safety margin is used in a 3-machine 9-node standard system, and the parameters of the 3-machine 9-node standard system are shown in Table 1-Table 4.

[0097] Table 1 Node parameters of 3-machine 9-node standard system

[0098]

[0099] Table 2 3-machine 9-node standard system line per unit value parameters (unit: pu)

[0100] Line head node name Voltage Reference (kV) Line head node name Voltage Reference (kV) resistance Reactance Admittance (B / 2) Bus 1 230.0 Bus A 230.0 0.01 0.085 0.044 Bus 1 230.0 Bus B 230.0 0.017 0.092 0.0395 Bus A 230.0 Bus 2 230.0 0.032 0.161 0.0765 Bus B 230.0 Bus 3 ...

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Abstract

The invention discloses a hyper-real-time setting method for superposed time sequences based on a transient voltage safety margin, belonging to the technical field of electric power system stabilization and control. When an alternating-current power transmission line has a fault, according to measured data such as nodal voltage, nodal current and the like, which are provided by a wide area information collecting system after a circuit breaker is caused by faults to trip, a least square method is used to line-line recognize a trans-admittance array, the recognized trans-admittance array is modified to respectively imitate a circuit front end superposition and a circuit tail end superposition; an improved Euler method is used to predicate a nodal voltage change trajectory under two superposed time sequences and the transient voltage safety margin is calculated, so that a quantitative evaluation for the voltage change trajectory is achieved; and the bigger transient voltage safety margin corresponding to the superposed time sequences is selected as an optimized superposition proposal. The method uses the least square method and the improved Ruler method to predicate the nodal voltage change trajectory, so that the superposition proposal is optimized; while improving the predicating precision, a problem that a superposed time sequence proposal operating way which is obtained from a traditional offline calculating and on-line matching method is mismatched with a fault position is solved.

Description

technical field [0001] The invention relates to a super-real-time coincidence sequence setting method based on a transient voltage safety margin, and belongs to the technical field of power system stability and control. Background technique [0002] At present, the emergency control in the second line of defense of the power system widely adopts the "offline calculation, online matching" control scheme. In order to solve the problem of working condition mismatch in the actual application of the strategy table calculated offline, Chinese scholars proposed a stable control framework of "online pre-decision and real-time matching" that can realize quasi-real-time tracking of the system in 1993. The online predisicion system (OPS-online predisicion system) developed by Guodian Automation Research Institute has been applied in Henan Power Grid, Jiangsu Power Grid and Shandong Power Grid since its first successful application in 1999 in Eastern Shaanxi Power Grid. With the wide a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 孙士云束洪春孙向飞董俊
Owner KUNMING UNIV OF SCI & TECH
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