A full-phase asynchronous oscillation discrimination method and device
A discrimination method and a discrimination device technology, applied in the direction of effective value measurement, etc., can solve the problems of inaccurate discrimination of full-phase asynchronous oscillation, poor operation reliability of out-of-synchronization and decoupling strategy devices, etc.
Active Publication Date: 2019-07-23
XUJI GRP +3
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[0004] The purpose of the present invention is to provide a method and device for discriminating full-phase asynchronous oscillation, which is used to solve the problem that the inaccurate discrimination of full-phase asynchronous oscillation in the out-of-synchronization decoupling strategy device leads to poor operational reliability of the out-of-synchronization decoupling strategy device
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[0077] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0078] The present invention provides a full-phase asynchronous oscillation discrimination method, the discrimination flow chart is as follows figure 1 As shown, it specifically includes the following steps:
[0079] Step A, judging whether the starting condition for all-phase asynchronous oscillation discrimination is satisfied.
[0080] Among them, the method for judging whether the starting condition of full-phase asynchronous oscillation is satisfied includes:
[0081] Step 1-1, obtain the three-phase phase current I of the out-of-step decoupling element A , I B and I C And the three-phase phase voltage U A , U B and U C the sampling value of .
[0082] Step 1-2, calculate the effective value I of the current three-phase phase current of the out-of-step decoupling element Atmp , I Btmp and I Ctmp , the maximum value I of the cu...
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The invention relates to an all-phase asynchronous oscillation discrimination method and device, and the method comprises the steps: judging whether the start conditions of all-phase asynchronous oscillation discrimination are met or not; judging whether a negative sequence current I2 of a current three-phase current of a step-out element and the maximum effective peak value IHmax of the three-phase current in each oscillation period meet a set condition or not when the start conditions are met; judging that the oscillation is the all-phase asynchronous oscillation if the set condition is met, or else judging that the oscillation is not all-phase asynchronous oscillation. According to the invention, the method can quickly and accurately determines whether the oscillation is the all-phase asynchronous oscillation or not under the condition that the start conditions of all-phase asynchronous oscillation discrimination are met through judging whether the negative sequence current I2 of the current three-phase current of the step-out element and the maximum effective peak value IHmax of the three-phase current in each oscillation period meet the set condition, thereby avoiding the operation refusal and wrong operation of a step-out strategy device, and improving the accuracy of a step-out strategy.
Description
technical field [0001] The invention relates to a full-phase asynchronous oscillation discrimination method and device, belonging to the technical field of electric power system relay protection. Background technique [0002] As the third line of defense for power system safety protection, the out-of-step decommissioning strategy device plays a particularly important role. For the non-full-phase operation mode allowed by the power system, the out-of-synchronization disassembly strategy device cannot act. If there is a malfunction or refusal to operate, it will bring a fatal disaster to the power grid of the power system and cause a large-scale paralysis of the power grid. [0003] Therefore, in the out-of-step disassembly strategy device, quickly and accurately identify whether the full-phase asynchronous oscillation provides a reliable basis for the action of the out-of-step disassembly strategy device, so as to prevent the out-of-step disassembly strategy device from malf...
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IPC IPC(8): G01R19/02
CPCG01R19/02
Inventor 陈继瑞李宝伟樊占峰姚武王智勇姜自强李旭邓茂军胡叶宾龚赟唐艳梅董新涛张哲席颖颖孟利平
Owner XUJI GRP