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Auxiliary power starting and switching method and system for steam turbine generator unit accident

A technology for steam turbine generator set and plant power consumption. It is applied in the direction of power network operating system integration, information technology support system, electrical components, etc. It can solve problems affecting the safety of the unit and the impact of auxiliary machines, and achieve the effect of improving safety.

Active Publication Date: 2017-12-12
XIAN THERMAL POWER RES INST CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

Due to the large drop in plant voltage, it has seriously affected the auxiliary machines. Some auxiliary machines have tripped, and the speed of the auxiliary machines that have not tripped has dropped, which seriously affects the safety of the unit.

Method used

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  • Auxiliary power starting and switching method and system for steam turbine generator unit accident
  • Auxiliary power starting and switching method and system for steam turbine generator unit accident
  • Auxiliary power starting and switching method and system for steam turbine generator unit accident

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0036] like figure 1 As shown, in the process of series switching, the working power switch QF1 and the standby power switch QF2 "open first and then close", the plant power will lose power for a short time, and the plant load current will be interrupted for a short time. Some of them have higher requirements on power quality and are more sensitive. The load that requires uninterrupted power supply may trip. In this switching mode, the working power incoming switch QF1 is opened first, and then the backup power incoming switch QF2 is closed again.

[0037] like figure 2 shown, using figure 1 The series switching method of the factory power shown in the above results in a short-term current interruption process (200ms~900ms) in the switching process of the factory power bus, and at the sam...

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Abstract

The invention provides an auxiliary power starting and switching method and system for a steam turbine generator unit accident, so that once a steam turbine shuts down because of an accident, an auxiliary power starting and switching instruction is sent out immediately without any delay no matter whether electrical protection like power reversing or program power reversing is carried out. The switching method comprises the following steps: (101), when a steam turbine generator unit is in a grid-connected mode and a steam turbine trips because of a fault, a steam turbine control system sends out a shutdown signal to an electrical signal and then a next step is performed; (102), after a generator-transformer unit protection device in the electrical system receives the steam turbine shutdown signal, an auxiliary power starting and switching command is sent out immediately to a rapid auxiliary power switching device without any delay, and a next step is performed; and (103), after the auxiliary power switching device receives the starting and switching command sent by the generator-transformer unit protection device, a combined emergency power supply switch instruction is sent out firstly and then an operating power tripping switch instruction is sent out by a delay under the circumstance that the auxiliary power switching condition is met, so that auxiliary power parallel switching is completed.

Description

technical field [0001] The invention belongs to the technical field of relay protection for large steam turbine generator sets, and relates to a power switching system and method for starting a power plant when a steam turbine generator set fails in a non-serious electrical fault and a boiler or steam turbine is shut down due to failure, in particular to a steam turbine generator set accident start-up plant Electricity method and system. Background technique [0002] At present, when large-scale steam turbine generator sets are in non-electrical serious faults (referring to the faults that do not require electrical protection action to immediately trip the generator outlet circuit breaker) and boilers and steam turbines are shut down due to failures, the program reverse power in the protection of the generator-transformer unit is used. The protection action starts the switching method of plant power, and the switching mode of plant power realized by this method is generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06
CPCH02J9/061H02J9/068Y02B70/30Y04S20/20
Inventor 兀鹏越赵峰柴琦赵煦寇水潮杨博李冬泉于信波孙鹏许朋江惠文涛
Owner XIAN THERMAL POWER RES INST CO LTD
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