Pilot protection method and system for photovoltaic power generation grid-connected tie line

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

Active Publication Date: 2021-09-24
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
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  • Abstract
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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

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  • Pilot protection method and system for photovoltaic power generation grid-connected tie line
  • Pilot protection method and system for photovoltaic power generation grid-connected tie line
  • Pilot protection method and system for photovoltaic power generation grid-connected tie line

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[0017]In order to make the objects, technical solutions, and advantages of the present invention more clearly, the technical solutions in the embodiments of the present invention will be described in contemplation in the embodiments of the present invention, and will be described, and the embodiments described herein will be described. It is a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art will belong to the scope of the present invention without all other embodiments obtained without creative labor.

[0018] See figure 1 , Which shows a photovoltaic power generation of the present disclosure grid flowchart orderwire longitudinal protection method.

[0019] like figure 1 , In S101, in response to obtain pilot phase voltage and phase current data protection data collecting device, it determines the amount of a phase current of the three phases mutations satisfies a f...

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Abstract

The invention discloses a pilot protection method and system for a photovoltaic power generation grid-connected tie line. The method comprises the steps of judging whether a current break variable of a certain phase in three phases meets a first condition or not or whether a zero-sequence voltage meets a second condition or not; if the current break variable of a certain phase in the three phases meets the first condition or the zero-sequence voltage meets the second condition, starting pilot protection, selecting a data window of a preset time period in a delayed mode, and calculating the current sum and the voltage sum of the tie line photovoltaic side and the tie line system side according to the phases; performing zero-sequence compensation on the sum of the voltages of the tie line photovoltaic side and the tie line system side of each phase, then solving a derivative of the sum, and calculating a correlation coefficient of each phase based on the sum of the currents of the tie line photovoltaic side and the tie line system side of each phase; and comparing the calculated correlation coefficient of each phase with a setting threshold value, and executing a corresponding protection action based on a comparison result. Accurate action can be realized under the condition that different fault types occur at different fault positions.

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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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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