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Relay Control Method Based on Impedance Plane Analysis of Positive Sequence Polarization Voltage

An analysis method, technology of impedance plane, applied in positive sequence polarized voltage phase-to-phase distance relay, based on impedance plane analysis of positive sequence polarized voltage distance relay action behavior analysis, in the field of positive sequence polarized voltage grounding distance relay, can solve the problem that cannot be solved Quantitatively outline the relationship between the distance protection action boundary and the calculated impedance

Active Publication Date: 2019-10-22
南京合智电力科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide an analysis method and analysis system for the action behavior of relays, which are used to analyze the action behavior of distance relays, and then solve the current method of analyzing the action behavior of distance protection based on the impedance plane, which only has qualitative features and cannot be quantitatively outlined. Technical issues on the relationship between the action boundary of out-distance protection and the calculated impedance

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  • Relay Control Method Based on Impedance Plane Analysis of Positive Sequence Polarization Voltage
  • Relay Control Method Based on Impedance Plane Analysis of Positive Sequence Polarization Voltage
  • Relay Control Method Based on Impedance Plane Analysis of Positive Sequence Polarization Voltage

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Embodiment 1

[0067] like figure 1 As shown, this embodiment provides a method for analyzing the action behavior of the relay, that is, analyzing the action behavior of the positive sequence polarization voltage distance relay through the constructed impedance plane.

[0068] Among them, the relays described in this embodiment are specifically positive sequence polarized voltage distance relays, including but not limited to positive sequence polarized voltage grounding distance relays and positive sequence polarized voltage phase-to-phase distance relays, that is, in this embodiment, the positive sequence polarized voltage distance relays in the line are obtained. When short-circuiting in the opposite direction, the action equation of the grounding distance relay and the phase-to-phase distance relay.

[0069] The analysis method of the action behavior of this relay is because the secondary equipment such as general protection and wave recorder can record the data of 2 to 4 cycles before th...

Embodiment 2

[0116] On the basis of Embodiment 1, this embodiment provides a method for controlling a relay, such as Figure 4 As shown, the control method includes the following steps:

[0117] Step S1, establish the action equation of the positive sequence polarization voltage distance relay based on the impedance plane;

[0118] In step S2, the action boundary of the distance relay is determined according to the above action equation.

[0119] In this embodiment, the method for establishing the action equation of the positive sequence polarized voltage distance relay based on the impedance plane in step S1 can be implemented by the method for analyzing the action behavior of the relay as described in Embodiment 1.

Embodiment 3

[0121] like Figure 5 As shown, on the basis of Embodiment 1, this embodiment provides a relay action behavior analysis system.

[0122] The relay action behavior analysis system includes:

[0123] Equivalent Impedance Calculation Module for solving the equivalent impedance of each sequence subsystem; and

[0124] Action equation building block to establish the action equation of a positive sequence polarized voltage distance relay based on an impedance plane.

[0125] The analysis method and control method of the relay of the present invention are described in detail below by using PSCAD to build a system model; the positive and negative faults at the bus exit are simulated, and the two different types of positive sequence polarization voltage and bus polarization voltage are analyzed on the impedance plane. Action of the distance relay.

[0126] The first action situation simulates a short circuit at the outlet through the small transition resistance AG in the positive di...

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Abstract

The invention relates to an analysis method for analyzing the action behavior of a positive sequence polarization voltage distance relay based on an impedance plane. The analysis method comprises thestep that the action behavior of the positive sequence polarization voltage distance relay is analyzed through the constructed impedance plane. The step further comprises the steps that Sa when a power system fails, the power system is divided into positive, negative and zero sequence subsystems, and the equivalent impedance of each sequential subsystem is solved; and Sb, an action equation of thepositive sequence polarization voltage distance relay based on the impedance plane is established. The analysis method of the relay uses current and voltage data to calculate the positive, negative and zero sequence impedances of the system in real time, so that the behavior of distance protection can be analyzed point by point; the calculated zero, positive and negative sequence impedances of the system are accurate; and the change of one operating mode of the power system can be reflected in real time.

Description

technical field [0001] The invention relates to the technical field of transmission line distance relays, in particular to an analysis method for analyzing the action behavior of positive sequence polarized voltage distance relays based on impedance planes, which is suitable for positive sequence polarized voltage grounding distance relays and positive sequence polarized voltage phase-to-phase distance relays. Background technique [0002] Distance protection is a kind of protection widely used in transmission lines of medium and high voltage power systems. It has the characteristics of being less affected by changes in system operating modes and easy to set; Symmetrical, asymmetrical faults, grounded, ungrounded faults). The essence of distance protection is to reflect the impedance value between the protection installation and the fault point, based on which to judge whether the fault point is located in the area or outside the area. Overcurrent and undervoltage relays on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 冯畅陈勇冯亚东
Owner 南京合智电力科技有限公司
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