Relaying protection fixed value setting method based on electromechanical transient method

A technology of relay protection and constant value setting, which is applied in the direction of automatically disconnected emergency protection devices, emergency protection circuit devices, electrical components, etc. Problems such as dynamic change process to achieve accurate calculation results

Inactive Publication Date: 2015-12-23
NR ELECTRIC CO LTD
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Problems solved by technology

[0011] The traditional calculation method of relay protection setting value adopts the static network impedance equivalent method for fault calculation, which does not consider the detailed transient model of the power system, and does not consider the various faults in the power system during and after the short-circuit fault disappears. The functions of regulating controllers (generator voltage regulator, governor, power system stabilizer, etc.), that is, only the i

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  • Relaying protection fixed value setting method based on electromechanical transient method
  • Relaying protection fixed value setting method based on electromechanical transient method

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[0026] The implementation process of the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0027] reference figure 1 As shown, the relay protection setting method based on the electromechanical transient method includes the following steps:

[0028] (1) Obtain power grid data from the relay protection setting software database, and establish power network positive sequence, negative sequence, and zero sequence algebraic equations;

[0029] (2) Combining the parameters of the electromechanical transient model, using the electromechanical transient simulation method to solve the simultaneous algebraic equations and nonlinear equations, obtain the dynamic process data of each state variable during the fault process and after the fault disappears.

[0030] The fault types considered in the fault calculation include: single-phase grounding, two-phase grounding, two-phase phase-to-phase faults not grounded, and three-phase faults...

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Abstract

The invention discloses a relaying protection fixed value setting method based on an electromechanical transient method. The relaying protection fixed value setting method comprises the following steps: (1) acquiring data from a relaying protection setting software database and establishing positive-sequence, negative-sequence and zero-sequence algebraic equations of a power network; (2) combining electromechanical transient model parameters and solving simultaneous algebraic equation and a nonlinear equation by using an electromechanical transient simulation method to obtain dynamic process data of each status variable of a system in a fault process and after faults disappear; and (3) calculating a relaying protection fixed value according to the dynamic process information of each status variable in the step (2). With the adoption of the relaying protection fixed value setting method, the accuracy of a short-circuit calculation result can be improved, so that the accuracy of the fixed value calculation in a protection fixed value setting process is improved.

Description

technical field [0001] The invention belongs to the field of electric power system relay protection, in particular to a method for setting a fixed value of relay protection. Background technique [0002] In recent years, with the continuous expansion of the scale of the power system, new challenges to the operation of the system continue to emerge. As the first line of defense of the power system, relay protection plays a vital role in the safe and stable operation of the system. The correctness of the relay protection setting directly affects whether the relay protection device can operate correctly. The basis of relay protection setting is short-circuit current calculation. [0003] At present, in the practice of setting value setting engineering, the calculation of short-circuit current generally adopts the static network impedance equivalent method based on the equivalent voltage source method, also known as the static short-circuit current calculation method. [0004...

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Application Information

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IPC IPC(8): H02H3/00
Inventor 毕兆东俞秋阳何俊峰郑杨斌方胜文王新宝常宝立
Owner NR ELECTRIC CO LTD
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