Power generator and phase modifier starting process identification method used for power system grid connection process

Abstract

The invention discloses a power generator and phase modifier starting process identification method used for a power system grid connection process. By comprehensively using a normal state and an abnormal state of a grid connection circuit breaker position contact during the starting process, when the position state of the grid connection circuit breaker is normal, the position of the circuit breaker is used as a main grid connection condition criterion. When the position state of the circuit breaker is abnormal, voltage, frequency, current electrical quantity, and other auxiliary contact information are used as the main criterion of the grid connection condition. By adopting node information as a starting identification condition, starting identification accuracy is high, protection misoperation and occurrence rate of faulted operation rejection are obviously reduced; single-station grid connection circuit breaker state connection and double-station grid connection circuit breakerstate connection are supported, and are suitable for the position connection of various grid connection circuit breakers, and therefore adaptability is wide, and practicability is strong.

Description

technical field [0001] The invention relates to a method for identifying the start-up process of a generator and a condenser in the grid-connected process of a power system, and belongs to the technical field of power systems. Background technique [0002] There are various ways to start the generator / converter. Some use the prime mover to increase the frequency during the start-up process, and some use a static frequency converter (SFC for short) to inject different frequency currents to achieve the frequency increase during the start-up process. . Taking the start-up mode of the static inverter as an example, the start-up process is divided into the start-up process of the static mode, the step-down process of failure in the same period, and the rapid restart process. [0003] The generator / converter start-up process needs to develop specific protections, such as developing start-up differential protection, start-up overcurrent protection, start-up zero-sequence overvolta...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a method for identifying the start-up process of the generator and the condenser during the grid-connected process of the power system, and solve the misjudgment caused by the judgment of the start-up process of the generator and the condenser in the prior art The rate is high, and there are technical problems such as protection malfunction and fault refusal

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