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Method and device for controlling a steam power plant

A power station, steam technology, applied in the direction of steam engine installations, machines/engines, mechanical equipment, etc., can solve problems such as inadmissible load flow and frequency problems, power drop at generator terminals, inability to distinguish between power reduction and short circuit interruption, etc.

Inactive Publication Date: 2011-07-27
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The control of the steam power plant has to react to two fault situations, in which there is the problem of not being able to distinguish between a power reduction and a short-circuit interruption in the corresponding start period, since in both cases the generator terminals power down
[0006] In the case of this problem in multiple steam power plants, it leads to unacceptable load flow problems and frequency problems

Method used

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  • Method and device for controlling a steam power plant
  • Method and device for controlling a steam power plant
  • Method and device for controlling a steam power plant

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Embodiment Construction

[0025] exist figure 1 A circuit arrangement or a device 10 for controlling a steam power plant with a generator 12 and a turbine 14 , which is not further shown, is indicated in the center. As basic elements, the device 10 comprises a PEL signal line 16 and a PSW signal line 18 , which lead from the generator 12 to a device 20 for providing a first signal. The device 20 is designed as a control or control device, a total of six switching elements 20 a , 20 b , 20 c , 20 d , 20 e and 20 f being formed. In this case, the actual power (PEL) of the generator 12 is transmitted via the PEL signal line 16 to a circuit element 20 a which checks whether the actual power drops abruptly by a predetermined value GPLSP. In this case, in particular a reduction in the jump pattern of greater than 70% is currently being checked. In order to check such power jumps, the power signal PEL is first filtered through the DT1 link.

[0026] In the switching element 20b, it is deduced from the inpu...

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Abstract

The present invention relates to a method comprising the following steps: providing (34) a first signal (Sl) showing a reduction of the current power level (PEL) of the generator (12), generating (36) a second signal (KU) showing a short circuit interruption as a function of the first signal (Sl), resetting (38) the second signal (KU) after a predetermined time period (TKU) and blocking (38) the second signal for a predetermined period of time (TSPKU), stopping and subsequently starting (40) the turbine (14) as a function of the second signal (KU), generating (42) a third signal (LAW) showing a load rejection as a function of the first signal (Sl), and permanently stopping (44) the turbine (14) as a function of the third signal (LAW).

Description

technical field [0001] The invention relates to a method for controlling a steam power plant with a generator and a turbine. Background technique [0002] The main contribution of steam power plants is voltage and frequency stabilization in combined grids as well as in island grids. In order to meet these stabilization requirements, the control strategies of steam power plants must meet the highest demands. These control strategies are important here in particular in the event of grid failures and rapid load changes. [0003] If, for example, the rotational speed of the generator deviates sharply from the nominal value and the machine is in danger of slipping (Schlüpfen) or the shafting of the generator is in danger of slipping and the turbine is endangered due to excessive rotational speed, the entire steam power plant must be selectively removed from the relevant Decoupling from the grid and shutting down according to its own needs allows the steam power plant to be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K13/02
CPCF01K13/02F01D15/10
Inventor M·本瑙尔H·韦特斯
Owner SIEMENS AG
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