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DEH control method for single turbine isolated network operation

A technology of steam turbine and isolated grid, which is applied in the parallel feeding arrangement of single grid, AC network circuit, electrical components, etc., can solve the problem of not being able to control the operation of single grid and isolated grid, and achieve automatic adjustment of steady-state operating point and stable grid frequency. Effect

Active Publication Date: 2018-12-21
HARBIN TURBINE +1
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing DEH cannot control the operation of the stand-alone isolated network

Method used

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  • DEH control method for single turbine isolated network operation
  • DEH control method for single turbine isolated network operation
  • DEH control method for single turbine isolated network operation

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Experimental program
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specific Embodiment approach 1

[0040] Specific implementation mode one: combine figure 1 To describe this embodiment,

[0041] The DEH control method for single-unit isolated-grid operation of steam turbines includes the following steps:

[0042] Step 1. Collect the power grid partial disconnection status signal corresponding to the steam turbine corresponding generator set, the steam turbine speed signal and the manual switching signal of the isolated grid;

[0043] The power grid part disconnection state signal corresponding to the steam turbine corresponding generator set includes the grid disconnection state (unconnected state) and the grid connection state; the isolated grid manual switching signal includes the isolated grid manual input signal and the isolated grid manual disconnection signal;

[0044] When any one of the isolated grid input conditions is met, the isolated grid corresponding to the corresponding generator set of the steam turbine is controlled to be connected to the large power grid,...

specific Embodiment approach 2

[0064] The process of "performing secondary frequency modulation" described in step 2 is as follows:

[0065] The secondary frequency regulation adopts PID controller, the rated speed is set to 3000RPM, and the feedback variable is the actual speed of the steam turbine; the target tuning output value is calculated by the actual speed value and the rated speed value of the steam turbine, and then the automatic mode or PID control of the PID controller Manual mode of the transmitter for secondary frequency modulation control;

[0066] When any one of the starting conditions of the PID controller manual mode is met, start the PID controller manual mode to perform secondary frequency modulation control;

[0067] PID controller manual mode startup conditions:

[0068] a3. The secondary frequency modulation function is removed;

[0069] b3, 2995RPM

[0070] c3. The actual speed is less than 3000RPM, and the main steam pressure is lower than the limit value; ...

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Abstract

A DEH control method for single turbine isolated network operation relates to a single turbine control method in order to solve problem that the existing DEH cannot be used to control the operation ofsingle-machine isolated network. When the steam turbine generator set is detected as a de-netting state signal, or the steam turbine rotational speed signal is greater than 3035RPM, or the steam turbine rotational speed signal is less than 2965RPM, or the solitary network manual input signal is detected, the invention controls the solitary network corresponding to the corresponding steam turbinegenerator set to be input into a large power network. When it is detected that the generator set corresponding to the steam turbine is in the grid-connected state and the rotational speed of the steamturbine is 2965 RPM <= steam turbine speed <= 3035 RPM, or when manual cutting is required, the grid part corresponding to the corresponding generator set of the steam turbine is controlled to be cutout from the large grid to form an isolated grid. And then the partial de-netting operation signals of the power grid is collected corresponding to the corresponding steam turbine generator sets, thesteam turbine speed signals and the secondary frequency modulation switching signals; The output of secondary frequency modulation is superposed with the actual rotational speed of steam turbine andthe primary frequency modulation is regulated. The method is suitable for the switch-on and switch-off control of single turbine isolated network.

Description

technical field [0001] The invention relates to the field of steam turbine control, in particular to a single-machine control method of a steam turbine. Background technique [0002] At present, domestic thermal power projects are becoming increasingly saturated, and the electric energy generated by some power plants cannot be completely transmitted to the large grid. In order to give full play to the power generation capacity of steam turbines, many self-provided power plants directly transmit the generated electric energy to the internal small grid of the enterprise, which not only saves expenses, but also improves efficiency. For example: in an aluminum company, 3# and 4# generator sets are directly sent to the company's internal isolated grid to provide all the power supply for the aluminum plant. This is a common isolated grid operation mode. However, under normal circumstances, the operating conditions of the isolated grid are extremely harsh, and the original DEH con...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/38H02J3/46H02J3/388
Inventor 郑禹齐子新刘忠涛郭德军胡宁
Owner HARBIN TURBINE
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