A control device and power protection method for a gas turbine generator set

Abstract

The invention provides a control device and power protection method for a gas turbine generator set. The control device comprises a controller, a power transmitter, a fuel control valve linear position transmitter, a power factor transmitter and a power protection unit, wherein the power transmitter, the fuel control valve linear position transmitter, the power factor transmitter and the power protection unit are connected with the controller; the power transmitter is used for measuring the real-time power of the generator set and transmitting the measured real-time power to the controller; the fuel control valve linear position transmitter is used for monitoring the position of a fuel control valve in real time and transmitting the monitored data to the controller; the power factor transmitter is used for measuring a power factor of the generator set in real time and transmitting the power factor to the controller; and the controller starts the power protection unit according to the received data. The control device comprehensively considers various correlated characteristics of a generator at low power, thereby realizing reverse power trip control of the generator.

Description

technical field [0001] The invention belongs to the technical field of gas turbine control, and more specifically relates to a control device and a power protection method for a gas turbine generating set. Background technique [0002] The reverse power operation condition is the motor operation mode of the generator set. The existing control method for the reverse power protection of the gas turbine generator set is blank in China. The domestic generator set protection schemes are all based on the protection scheme of the steam turbine generator set. For the steam turbine, When the main steam valve is closed suddenly for some reason or the main steam valve is closed due to the protection action of the unit, if the generator outlet circuit breaker does not trip, the generator will gradually transition to the motor running state, that is, from sending active power to the grid system to Absorb active power from the power grid and drag the steam turbine to rotate. Since the cyl...

AI Technical Summary

Problems solved by technology

[0009] In the existing reverse power protection of the generator, when the main steam valve is closed, if the closure is caused by malfunction, the judgment conditions and methods are not given in the control system; At this time, the main steam valve is still not closed, causing refusal to operate but the generator outlet circuit breaker has tripped, or the control signal has been sent but the main steam valve is not closed tightly. Serious accidents that cause the unit to run away. For gas turbine generator sets, if the fuel control valve is not closed tightly, the unburned substance may explode and catch fire. The lack of detection of the valve or fuel control valve position cannot reliably ensure the safety of the unit. run

[0010] The existing technology lacks monitoring and protection for the abnormality or disconnection of the current transformer TA and the voltage transformer TV of the measuring instrument. If the misjudgment caused by the power measuring instrument itself causes low power or reverse power tripping, it will not only cause great harm to the power generation enterprise. Large economic losses will also affect the stability of the power system

[0011] The action setting value of the reverse power relay in the prior art only considers the minimum loss of the steam turbine during reverse power operation and the minimum loss of the generator during reverse power operation, without considering the mechanical efficiency of the transmission shaft, the main oil pump of the steam turbine and the top shaft of the generator The loss of the oil pump, the mechanical efficiency of the load gearbox, and the action setting value of the reverse power relay of the gas turbine generator set are currently not publicly available for reference.

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