Generator power transmission system and method

Abstract

The invention discloses a generator power transmitting system and method. The system comprises a power transmitting device, a generator terminal protection-level current transformer TA, a generator terminal measuring-level current transformer and a generator terminal voltage transformer TV. The power transmitting device collects generator terminal three-phase voltages, generator terminal protection-level TA three-phase currents and generator terminal measuring-level TA three-phase currents through the voltage transformer and the current transformer. The fundamental wave effective values of positive sequence voltages, the positive sequence currents of the generator terminal protection-level TA, the positive sequence currents of the generator terminal measuring-level TA and the three-phase currents of the protection-level TA are calculated. When the fundamental wave effective value of the three-phase currents of the protection-level TA is larger than a switching threshold value Iset, power calculation currents are extracted from the protection-level TA, otherwise the power calculation currents are extracted from the measuring-level TA, and a power value is calculated through the positive sequence voltages and the power calculation positive sequence currents. According to the generator power transmitting system and method, generator power abnormal large fluctuation caused by incorrect action of a generator power automatic adjusting system during the system failure can be avoided.

Description

technical field [0001] The invention belongs to the technical field of generator power transmission, and relates to a generator, in particular to a generator power transmission system; meanwhile, the invention also relates to a generator power transmission method. Background technique [0002] With the increasing degree of automation of the power system, automatic power plant power adjustment and remote automatic frequency adjustment are basically popular. However, when the system fails or is greatly disturbed, the power regulation system of the generator will follow the action, and power overshoot often occurs, causing large fluctuations in generator power and unstable operation of the unit. [0003] The reason is: the sampling front end of the generator power regulation system is generally the outlet power transmitter of the generator or the generator-transformer unit. When the system fails, the voltage drops and the current increases sharply, while the measurement-level c...

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Problems solved by technology

[0003] The reason is: the sampling front end of the generator power regulation system is generally the outlet power transmitter of the generator or the generator-transformer unit. When the system fails, the voltage drops and the current increases sharply, while the measurement-level current mutual inductance connected to the power transmitter Due to the fast saturation characteristics of the transmitter (TA), the secondary current value of the transmitter sampling TA does not increase correspondingly according to the transformation ratio, which leads to serious distortion of the output power of the power transmitter

In turn, the related automatic control system does not work normally, causing abnormal large fluctuations in the power of the generator, and even causing the zero-power cut-off protection action of the generator set to cut off the machine incorrectly.

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