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A Pole Protection Voltage Acquisition Circuit and Converter Zero-Sequence Overvoltage Protection Method

A voltage acquisition, zero-sequence overvoltage technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc. , Avoid damage under overvoltage, and ensure the effect of safe and stable operation

Active Publication Date: 2019-05-28
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a pole protection voltage acquisition circuit and a converter zero-sequence overvoltage protection method to solve the problem that the pole protection system cannot quickly troubleshoot if parallel resonance occurs when the converter is unlocked

Method used

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  • A Pole Protection Voltage Acquisition Circuit and Converter Zero-Sequence Overvoltage Protection Method
  • A Pole Protection Voltage Acquisition Circuit and Converter Zero-Sequence Overvoltage Protection Method
  • A Pole Protection Voltage Acquisition Circuit and Converter Zero-Sequence Overvoltage Protection Method

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Embodiment Construction

[0031] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0032] An embodiment of the present application provides a pole protection voltage acquisition circuit, such as image 3 As shown, the pole protection voltage acquisition circuit is used in the pole protection system, including an input circuit, an output circuit and a measurement processing unit, wherein the input circuit includes an input resistance R and an equivalent inductance L1 on the high-voltage side connected in series with the input resistance R, and the output circuit Including the equivalent inductance L2 on the low-voltage side, the equivalent inductance L2 on the low-voltage side is connected to the measurement processing unit, and the input circuit also includes the first relay...

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Abstract

The invention discloses a pole protection voltage acquisition loop and a converter zero sequence overvoltage protection method. The converter zero sequence overvoltage protection method includes the steps: acquiring the electrical quantity of the converter through the pole protection voltage acquisition loop, wherein the electrical quantity of the converter includes converter valve side zero sequence voltage, converter valve side voltage deviation and converter valve side voltage frequency deviation; according to the electrical quantity of the converter, determining whether parallel resonance conditions are satisfied; if the parallel resonance conditions are satisfied, determining whether the converter is in the unlocked state, and determining whether zero sequence overvoltage protection is invested; and if the converter is in the unlocked state and the zero sequence overvoltage protection is invested at the same time, sending a first protection command from a logic module, wherein according to the first protection command, the pole protection system controls the normally closed contact of a first relay to be opened to enable a bypass resistor to access the input loop. The pole protection voltage acquisition loop and the converter zero sequence overvoltage protection method can eliminate the parallel resonance influence when the converter is in the unlocked state, so as to enable the pole protection system to quickly find equipment faults.

Description

technical field [0001] The application relates to the technical field of control and protection of direct current transmission systems, in particular to a pole protection voltage collection circuit and a method for zero-sequence overvoltage protection of a converter. Background technique [0002] In order to avoid severe damage to DC equipment, DC transmission systems are equipped with pole protection systems. When a fault occurs in the high-voltage DC system or equipment, the pole protection system will calculate and judge the fault type according to the set protection setting value, and exit according to the set action setting value to quickly and reliably remove the fault, so as to realize the protection of high-voltage DC equipment , to ensure the safe and stable operation of the DC transmission system. [0003] figure 1 It is the circuit diagram of the measurement circuit of the final screen voltage transformer commonly used in DC transmission projects, including the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/12H02H7/26H02H3/06
CPCH02H3/066H02H7/12H02H7/262H02H7/268
Inventor 邢超李胜男宋忧乐覃日升张丽陈勇刘明群赵勇帅
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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