A configuration method for a wide-area current protection system under the condition that a distributed wind farm is connected to a distribution network

Abstract

The invention relates to a wide range current protection system for a distributed type wind power plant and a configuration method. The wide range current protection system comprises an electric power monitoring device, protection and monitoring devices and a communication network, which exist in upstream and downstream transformer substations of an access point; the configuration method comprises the following specific steps: the current protection is executed in the direction of the open protection and monitoring devices at the power supply side of each line system; the section I protection and the second II protection of each protection and monitoring device and the section I and the second II of a next-stage line are combined through the communication network to form a communication unit; a set of protection and monitoring device is additionally arranged at the last-stage line of the access point of the distributed type wind power plant; enabling the opened directional elements to execute directional current protection. The wide range current protection system disclosed by the invention can realize bilateral power protection when the distributed type wind power plant is connected to the power distribution network on the premise of not additionally arranging a protector at the opposite line; the existing high-speed electric communication network is used to monitor and transmit the overcurrent information monitored by the protection and monitoring devices distributed or centrally mounted in the protection line; the fault in the range of each line protection section I instantaneously causes line tripping; the fault in the range of the section II causes the line tripping according to preset time; the external fault causes the line tripping according to the predetermined gradient time. Therefore, the wide range current protection system is simple and reliable in main and standby protection, and complete in functions.

Description

technical field [0001] The invention relates to a decentralized wind farm wide-area current protection system and a configuration method. Background technique [0002] With the rapid development of the wind power industry, the concentrated operation of large-scale wind power projects may have a huge impact on the power grid, affecting the safe and stable operation of the power grid; The phenomenon of electricity is becoming more and more serious. Compared with conventional centralized wind farms, decentralized wind farms are mostly located in the third and fourth types of wind areas, and the access point is close to the user terminal, which can be accommodated locally, thereby alleviating the requirements for power transmission of the power system and reducing the cost of power grid development. Pressure and difficulty; due to the small installed capacity of the distributed wind farm, there is no need to build a transformer and distribution station, and it can be connected ...

AI Technical Summary

Problems solved by technology

According to the traditional protection configuration method, it is necessary to configure directional current protection at both ends of the line and have corresponding time limit cooperation

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