A frequency conversion control method and system for a circulating water pump motor in a thermal power plant

A circulating water pump and frequency conversion control technology, which is applied in the direction of AC motor control, control system, pump control, etc., can solve the problems of not considering the power consumption of the motor, the decrease of the variable load rate of the unit, and disadvantages, so as to reduce the performance index of AGC and improve the regulation Speed, increase the effect of adjusting the power

Active Publication Date: 2020-05-08
国家能源(山东)工程技术有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Though above-mentioned two prior art produced beneficial effect separately, produced unfavorable result again simultaneously
Existing technology 1 Although the vacuum of the condenser can be controlled at the optimum vacuum by changing the speed of the circulating water pump to maximize economic benefits, but when the unit is put into AGC and assumes the power adjustment mode of operation, that is, the R mode, such as when the speed of the circulating water pump changes The changing direction of generating power of the unit is opposite to that of the AGC command, which will reduce the variable load rate of the unit, thereby reducing the AGC performance index of the unit; although the second prior art can indirectly improve the AGC performance index of the unit by changing the speed of the circulating water pump, However, it does not take into account that sometimes the increase in the speed of the circulating water pump leads to a substantial increase in the power consumption of the motor, resulting in a decline in the overall economic benefits of the unit

Method used

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  • A frequency conversion control method and system for a circulating water pump motor in a thermal power plant
  • A frequency conversion control method and system for a circulating water pump motor in a thermal power plant
  • A frequency conversion control method and system for a circulating water pump motor in a thermal power plant

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Experimental program
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Effect test

Embodiment 1

[0033] The purpose of this embodiment is to comprehensively consider the advantages and disadvantages of the existing technology, taking into account energy saving and consumption reduction and improving the AGC performance index of the unit. figure 1 shown, including the following steps:

[0034] Step 1, judge whether the motor of the circulating water pump is in the variable frequency operation mode, if so, execute step 2; otherwise, continue to execute this step.

[0035] This step is the premise of the frequency conversion control of the circulating water pump motor, that is, the following steps are necessary only when the circulating water pump motor is in the frequency conversion operation mode.

[0036] Step 2, judge whether the vacuum value of the condenser is the optimum vacuum value, if so, return to step 1; otherwise, execute step 3.

[0037]Regarding the optimal vacuum value of the condenser, there are many introductions in existing technologies and literatures, t...

Embodiment 2

[0059] The purpose of this embodiment is to provide a thermal power plant circulating water pump motor frequency conversion control system, such as figure 2 As shown, the control system includes 6 modules, which are: 21. Unit parameter acquisition module; 22. Motor power frequency / frequency conversion judgment module; 23. Condenser optimal vacuum calculation module; 24. Unit R mode AGC mode Judgment module; 25. Judgment module of influence of frequency conversion adjustment on AGC performance index; 26. Frequency conversion adjustment module.

[0060] The unit parameter acquisition module is used to collect the operating parameters of the unit and the circulating water pump, such as condenser vacuum, atmospheric pressure, thermal power unit active power, circulating water pump motor power, etc., for use by other modules.

[0061] The electric motor power frequency / variable frequency judging module is used to judge whether the circulating water pump motor is in power frequency...

Embodiment 3

[0073] The purpose of this embodiment is to provide an electronic device.

[0074] In order to achieve the above object, this embodiment provides an electronic device, including a memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the program, the following steps are implemented, including :

[0075] Step 1, judge whether the motor of the circulating water pump is in the variable frequency operation mode, if so, execute step 2; otherwise, continue to execute this step.

[0076] Step 2, judge whether the vacuum value of the condenser is the optimum vacuum value, if so, return to step 1; otherwise, execute step 3.

[0077] Step 3, judge whether the unit is running in the AGC mode that unconditionally undertakes to adjust the power, or judge whether the unit is in the AGC mode and runs in the R mode: if yes, go to step 4, otherwise go to step 5.

[0078] Step 4, judging whether changing the power supply fr...

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Abstract

The invention discloses a frequency conversion control method and system for a circulating water pump motor of a thermal power plant. The method comprises the following steps that an operation mode ofthe circulating water pump motor is continuously monitored, and the vacuum value of a condenser is acquired when the operation mode is a variable frequency operation mode; if the vacuum value is notthe optimal vacuum value, the working state of a unit is obtained for further judging whether an AGC mode is input and operating in an R mode is conducted or not; if the unit is in the AGC mode and operates in the R mode, and the vacuum value of the condenser is changed to the optimal vacuum value by adjusting the power supply frequency of the circulating water pump motor, the AGC performance indexes of the unit cannot be adversely affected, or the unit is not in the AGC mode and operates in the R mode, the power frequency of the circulating water pump motor is adjusted to enable vacuum of thecondenser to be changed to the optimal vacuum. According to the method, the disadvantages of the prior art are comprehensively considered, energy conservation and consumption reduction are considered, and the AGC performance indexes of the unit are improved.

Description

technical field [0001] The invention belongs to the technical field of motor frequency conversion control, and in particular relates to a method and system for frequency conversion control of a circulating water pump motor in a thermal power plant. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] Existing technology 1: the frequency conversion adjustment of the circulating water pump motor realizes the energy saving and consumption reduction of the steam turbine unit. [0004] Modern thermal power plants widely use a circulating cooling water system composed of circulating water pumps and cooling towers to absorb heat from the exhaust steam of the low-pressure cylinder of the steam turbine to maintain the vacuum degree of the condenser. When other conditions are constant, the amount of cooling water determines the vacuum value of the cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/06H02P27/04
CPCF04B49/065H02P27/04
Inventor 王庆想张宗辉宋益纯沈迎张勇赵建新任乾超李军
Owner 国家能源(山东)工程技术有限公司
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