A photovoltaic power generation grid-connected tie line longitudinal protection method and system

A longitudinal protection, photovoltaic power generation technology, applied in emergency protection circuit devices, emergency protection data processing devices, electrical components, etc., can solve problems such as refusal to move, sensitivity decline, etc., to achieve strong resistance to transition resistance, sensitivity and reliability. high sex effect

Active Publication Date: 2021-12-31
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and system for longitudinal protection of photovoltaic power generation grid-connected tie line, which solves the problem that the existing longitudinal differential protection may decrease in sensitivity or even refuse to operate in photovoltaic power generation grid-connected tie line

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  • A photovoltaic power generation grid-connected tie line longitudinal protection method and system
  • A photovoltaic power generation grid-connected tie line longitudinal protection method and system
  • A photovoltaic power generation grid-connected tie line longitudinal protection method and system

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[0017]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] see figure 1 , which shows a flow chart of a photovoltaic power generation grid-connected tie line longitudinal protection method of the present application.

[0019] like figure 1 As shown, in S101, in response to obtaining the three-phase voltage data and three-phase current data collected by the longitudinal protection device, it is jud...

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Abstract

The invention discloses a method and system for longitudinal protection of photovoltaic power generation grid-connected tie lines. The method includes: judging whether the sudden change in current of a certain phase in three phases satisfies the first condition or whether the zero-sequence voltage satisfies the second condition; If the sudden change of a certain phase current meets the first condition or the zero-sequence voltage meets the second condition, the longitudinal protection will be started, and the data window of the preset time period will be selected after a delay, and the PV side and the tie line of the tie line will be calculated separately by phase. The sum of the current and the voltage on the system side; the zero-sequence compensation is performed on the sum of the voltages on the photovoltaic side and the system side of the tie-line of each phase to obtain its derivative, and based on the photovoltaic side of the tie-line of each phase and the system side of the tie-line Calculate the correlation coefficient of each phase by the sum of the currents; compare the calculated correlation coefficient with the setting threshold, and execute the corresponding protection action based on the comparison result. Realized that it can act accurately in the case of different fault types at different fault locations.

Description

technical field [0001] The invention belongs to the technical field of relay protection of electric power systems, and in particular relates to a method and system for longitudinal protection of grid-connected tie lines of photovoltaic power generation. Background technique [0002] Solar energy is clean and non-polluting, widely distributed, and inexhaustible. It has unique advantages in development and utilization, and has become a hot spot in the development of new energy. Affected by the characteristics of the photovoltaic power supply itself and its inverter control strategy, the fault characteristics of the photovoltaic system are different from the traditional synchronous machine system. The protection principle formed on the basis of the analysis of the fault characteristics of the traditional synchronous machine may not be suitable for large-scale centralized photovoltaics. The protection performance may decline due to the change of system fault characteristics, or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H1/00
CPCH02H7/263H02H1/0092
Inventor 桂小智潘本仁梁振锋张妍万勇王冠南蒙天赐周仕豪
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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