Main transformer excitation inrush current-free commissioning method for boosting from zero of flexible power electronic switch

Abstract

The invention discloses a main transformer excitation inrush current-free commissioning method for boosting from zero by a flexible power electronic switch. The method comprises the following steps of: connecting a 10KV alternating current bus at the low-voltage side of a main transformer with another 10KV alternating current bus by adopting the flexible power electronic switch to form a flexible interconnection transformer substation; the main transformer side comprises a low-voltage side switch K1 and a high-voltage side switch K2; a VSC2 of the flexible power electronic switch is connected with a 10KV alternating current bus at the low-voltage side of the main transformer; the VSC1 of the flexible power electronic switch is connected with another 10KV alternating current bus; a main transformer low-voltage side switch K1 is closed, and alternating-current buses on the two sides of the main transformer complete boosting from zero through the control strategy of the VSC2; after the voltage of the alternating-current buses on the two sides of the main transformer rises to rated voltage, alternating-current buses on the two sides of a switch K2 on the high-voltage side of the main transformer are controlled to be synchronous, and the switch K2 is closed to complete operation of the main transformer; the commissioning mode prevents voltage jump at two sides of the main transformer from generating excitation inrush current, and ensures stable and safe operation of a power system.

Description

technical field [0001] The invention belongs to the technical field of power system relay protection, and in particular relates to a main transformer non-excitation inrush current operation method of a flexible power electronic switch zero-starting and boosting. Background technique [0002] The power transformer is an extremely important electrical equipment in the power system. It plays the role of converting low voltage into high voltage, high voltage into low voltage or isolating the AC power supply. Whether the transformer can work normally is directly related to the continuous and stable operation of the power system. . When the transformer is put into operation at no-load or when the voltage recovers after the external fault is removed, due to the saturation of the core magnetic flux and the nonlinear characteristics of the core material, a large inrush current will be generated on the side of the transformer voltage abrupt change. The magnetizing inrush current will...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for putting into operation a main transformer with no excitation inrush current by boosting the voltage from zero with a flexible power electronic switch, so as to solve the problem of using an excitation inrush current suppressor to suppress the excitation inrush current, which cannot prevent the generation of excitation inrush current and other technical issues

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