The method of dcs judging the failure of the transmission line to make the generating set transfer to the small island mode
A technology for transmission lines and generator sets, applied in the field of electric power, can solve the problems of over-frequency tripping, DEH cannot perform control mode conversion, and generator sets cannot be changed, and achieves the effect of ensuring the safety of generator sets, covering a wide range of trigger conditions, and saving equipment investment.
Active Publication Date: 2019-03-29
STATE GRID LIAONING ELECTRIC POWER RES INST +2
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Problems solved by technology
However, when the external transmission line fails, the high-voltage side circuit breaker of the main transformer will not trip. If the power plant is not equipped with a power system stabilization device, the identification of the FCB small island mode cannot be realized. FCB small island operation mode, causing overspeed or overfrequency tripping of the unit and resulting in the loss of power consumption of the plant
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[0041] In the present invention, a method for using DCS to judge a fault in a power transmission line so that a generator set is transferred to an island mode specifically includes:
[0042] 1, with the control configuration SAMA figure of the present invention, namely image 3 , and the state judgment SAMA diagram of the power plant side transmission line circuit breaker in this connection mode, namely Figure 4 The input points in are replaced by figure 2 The shown project actual parameter variable point and circuit breaker state point;
[0043] 2. Output the "transmission line fault" signal to the human-computer interaction screen for display, and send it to the alarm system for display.
[0044] 3. Send the signal of "tripping the circuit breaker on the high voltage side of the main transformer" to the command outlet of the circuit breaker on the high voltage side of the branch main transformer.
[0045] 4. Send the "DEH control system switch to speed control mode" sig...
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The invention belongs to the electric power technology field and especially relates to a method of using a DCS to determine a power transmission line fault so that a generator set is converted into an island model. According to the method, in a steam turbine generator group control system, under the condition that an external power transmission line generates a fault, OPC motion is used in 2-3 seconds, a DCS control system determines an external power transmission line fault, a steam turbine generator group is in a FCB island model and actively trips off a variable high voltage side circuit breaker so that a DEH control system is converted into a rotating speed control mode from a power control mode. The method is characterized by carrying out logic determination and logic operation on a steam turbine rotating speed, active power of a generator and an OPC motion signal; using a determination result to trigger FCB motion; and using the determination result to actively trip a main variable high voltage side circuit breaker so as to generate a generator solution column signal so that the DEH control system is converted into a rotating speed control mode. Accident generation can be avoided, FCB trigger condition coverage is wide and set safety is guaranteed.
Description
technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a method for a DCS to judge a fault in a power transmission line so that a generating set transfers to an island mode. Specifically, in the case of failure of the external transmission line in the control system of the steam turbine generator set, the DCS control system can judge the failure of the external transmission line within 2-3 seconds by using the OPC action, and the steam turbine generator set In the FCB small island mode, and actively trip the high-voltage side circuit breaker, so that the DEH control system is transferred from the power control mode to the speed control mode. Background technique [0002] At present, some turbogenerator sets are designed with FCB function, which can trigger the FCB function when the high-voltage side switch of the main transformer trips, so that the unit is in the island operation mode, and can be quickly connected ...
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IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 丁永允赵志强张小辉黄晓鹏马铭宏叶振起魏来张建志
Owner STATE GRID LIAONING ELECTRIC POWER RES INST