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Load emergency adjusting method and load emergency adjusting device for thermal power generator unit in AGC manner

A technology for thermal power units and adjustment methods, which is applied in adaptive control, control/regulation systems, instruments, etc., can solve problems such as large drop rate and power grid frequency drop, and achieve the effects of low cost, improved stability, and good reliability

Active Publication Date: 2017-06-13
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the power grid fails, such as large-scale power shortage accidents such as UHV DC single- and bipolar blocking, large-scale power plants going off-grid, etc., the frequency of the power grid will drop rapidly and at a relatively large rate. For example, at 21:58 on September 19, 2015, Jin Su DC bipolar lockout, loss of power 5.4 million kilowatts, the lowest frequency fluctuation of East China power grid to 49.563Hz, and after 221 seconds to restore to 49.80Hz

Method used

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  • Load emergency adjusting method and load emergency adjusting device for thermal power generator unit in AGC manner
  • Load emergency adjusting method and load emergency adjusting device for thermal power generator unit in AGC manner
  • Load emergency adjusting method and load emergency adjusting device for thermal power generator unit in AGC manner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as image 3 As shown, a thermal power unit load emergency flexible and fast adjustment device under grid failure, including an analog signal collector, a switch signal collector, a multiplier MUL, an RS trigger, a function generator, a logic OR module, a logic NOT module, High and low limit alarm module and analog switcher, in which:

[0040] The digital signal collector DI receives the power grid failure unit emergency mode switching / deactivation signal issued by the power grid, sends one way to the setting terminal S of the RS flip-flop, and one way is sent to the logic or module after being reversed by the logic NOT module An input terminal X1 of OR, the main steam pressure deviation value signal obtained by calculating the difference between the main steam pressure set value and the main steam pressure measurement value of the analog signal collector S receiver group is sent to the high and low limit alarm module HLALM The other input terminal X2 of the logica...

Embodiment 2

[0047] An emergency load adjustment method for thermal power units in the AGC mode. When a power gap accident occurs in the power grid, it is judged whether the regional control deviation value exceeds the first setting range and whether the main steam pressure deviation value exceeds the second setting range:

[0048] (1) If the unit regional control deviation value exceeds the first setting range and the main steam pressure deviation value does not exceed the second setting range, artificially accelerate the load adjustment;

[0049] (2) If the regional control deviation value of the unit does not exceed the first setting range, automatic load adjustment is performed;

[0050] (3) If the regional control deviation value of the unit exceeds the first setting range and the main steam pressure deviation value exceeds the second setting range, automatic load adjustment will be performed.

[0051] When the power grid fails, such as large-scale power gap accidents such as UHV DC u...

Embodiment 3

[0056] Taking Shandong Power Grid in North China as an example, its frequency regulation and peak regulation are in accordance with the "Implementation Rules for Grid-connected Operation Management of Power Plants in North China Region". %; the general thermal power unit with intermediate storage bin pulverizing system is 2% of the rated active power of the unit. Taking a 300MW direct-blowing drum boiler unit in Shandong Power Network as an example, according to regulations, its regulation rate is 300×1.5%=4.5MW / min, that is, the standard regulation rate set in analog generator A1 is 4.5, which is also It is the load adjustment rate of the unit during normal AGC adjustment. The upper limit H of the high and low limit alarm module HLALM is set to 0.6 and the lower limit L is set to -0.6. After the field performance test of the unit, when the load adjustment rate is not greater than 8MW / min, the main parameters such as the main steam pressure can be controlled within the specif...

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Abstract

The invention discloses a load emergency adjusting method and a load emergency adjusting device for a thermal power generator unit in an AGC manner. The load emergency adjusting device can flexibly and quickly adjust adjusting rate of the thermal power generator unit. The load emergency adjusting device is characterized in that the load emergency adjusting device comprises an analog quantity signal gatherer S which is used for acquiring a main steam pressure offset, a high-and-low-limit alarm module HLALM, a switching quantity signal gatherer DI, a logic not module, a logic or module, an RS trigger, an analog quantity switching device AXSEL, a multiplexer MUL, an A2 function generator and an A1 function generator; the output of the switching quantity signal gatherer DI is divided into two paths; one path is connected with the setting end of the RS trigger, and the other path is connected with the input end of the logic or module through the logic not module; the output end of the RS trigger is successively connected with the analog quantity switching device AXSEL and the multiplexer MUL; and the A2 function generator and the A1 function generator are respectively connected with the input end of the switching quantity switching device AXSEL and the input end of the multiplexer MUL.

Description

technical field [0001] The invention relates to the field of frequency and peak shaving of thermal power units, in particular to a method and device for emergency flexible and rapid load adjustment of thermal power units under power grid failure. Background technique [0002] With new energy connected to the grid, load growth and the scale of the grid continue to increase, under the new situation of the interconnection of the UHV grid and the regional grid, the connection between the grids at all levels is becoming increasingly close, and the requirements for coordination and cooperation between the grid and the unit are also increasing. higher. For the safe and stable operation of the power grid, all large-scale thermal power units are required to use the automatic generation control (AGC) function. Large-scale thermal power units are often operated in a wide load range, generally in the range of 50% to 100% of the rated load, and the units are required to be fast and accur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 李军廖大鹏李慧聪张辉汪挺杜鹏程李杰
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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