A precise compensation method for distance protection of lines installed with series equipment

A technology of series equipment and distance protection, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of not being equal, and achieve the effect of improving reliability and sensitivity

Inactive Publication Date: 2018-12-21
NR ELECTRIC CO LTD +1
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  • Abstract
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Problems solved by technology

[0005] Chinese patent application number 200910034668.7, published on December 14, 2011, the name of the invention is a method for protecting the distance of a series capacitance compensation line combined with a phase-comparing relay. , its disadvantage is that it is only suitable for transmission lines where the series equipment is capacitive series equipment
Its disadvantage is that the maximum equivalent impedance of UPFC is not an accurate equivalent impedance, and the equivalent impedance of UPFC during normal operation is not strictly equal to the equivalent impedance of UPFC during system failure

Method used

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  • A precise compensation method for distance protection of lines installed with series equipment
  • A precise compensation method for distance protection of lines installed with series equipment
  • A precise compensation method for distance protection of lines installed with series equipment

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Embodiment Construction

[0035] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] Such as figure 1 As shown, the present invention provides a method for accurate compensation of distance protection for installing series equipment lines, including the following steps:

[0037] Step 1, collect the voltage and current of the protection installation and the voltage drop at both ends of the series equipment, and calculate the equivalent impedance of the series equipment in real time;

[0038] For ground-distance relays, the equivalent impedance Z of series-connected devices Cφ The formula for calculating is:

[0039]

[0040] Among them, U Cφ is the voltage drop across the phase terminals of the series equipment, I φ In order to protect the phase current at the installation, I 0 In order to protect the zero-sequence current at the installation place, K is the zero-sequence compensation co...

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Abstract

The invention discloses a distance protection accurate compensation method for installing a circuit of series equipment. The distance protection accurate compensation method comprises the following steps of acquiring a voltage and a current of a protection installation part and a voltage drop of two ends of the series equipment, and calculating equivalent impedance of the series equipment in real time; accurately compensating distance protection setting impedance according to the equivalent impedance; and calculating a working voltage and a polarization voltage, and building a distance relay. By the compensation method, the equivalent impedance of the series equipment can be calculated in real time, and accurate compensation is performed on distance protection.

Description

technical field [0001] The invention belongs to the field of relay protection of electric power systems, and in particular relates to an accurate compensation method for distance protection of lines installed with series equipment. Background technique [0002] The installation of series equipment on transmission lines is an important measure to improve the stable operation of the system. The series equipment changes the potential characteristics of the head and end of the line, thereby further changing the potential phase and amplitude distribution in the system, and plays a role in regulating the power flow distribution in the entire area. [0003] Although the installation of series devices on transmission lines has obvious economic benefits, the existence of series devices destroys the uniformity of transmission line impedance, which brings great difficulties to the design of line protection, especially distance protection. When the equipment in series behaves capacitiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 赵青春陆金凤谢华戴光武徐晓春
Owner NR ELECTRIC CO LTD
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