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Distributed variable frequency water pump control method

A technology of variable frequency water pump and control method, which is applied in heating mode, hot water central heating system, lighting and heating equipment, etc., can solve problems such as difficulty in pump operation adjustment and control, influence of hydraulic working conditions, etc., and avoid a large number of measurement and debugging work. Quantity, operation control is simple, and the effect of increasing system control cost

Pending Publication Date: 2022-01-21
西安沣东华能热力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are a large number of booster pumps at the user site, all of which are connected in parallel, and their hydraulic conditions affect each other, which brings great difficulties to the operation adjustment and control of the pumps

Method used

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  • Distributed variable frequency water pump control method
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  • Distributed variable frequency water pump control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] refer to figure 1 , as an embodiment of the present invention, provides a distributed frequency conversion water pump control method, including:

[0039] Control the frequency f of the water pump to obtain the flow demand G of the network pipe and the pressure value P of the main water supply pipe 1 And the return water main pipe pressure value P 2 .

[0040] According to the water mains pressure value P 1 and return water header pressure value P 2 , to obtain the pressure difference H of the water supply and return water main network, and obtain the required data [G, H]. It should be noted:

[0041] The pressure difference H of the water supply and return water main pipe network includes,

[0042] H=P 2 -P 1 ;

[0043] Among them, H represents the pressure difference between the water supply and return water main pipe network, P 1 Indicates the pressure value of the water supply main pipe, P 2Indicates the return water main pipe pressure value.

[0044] Cha...

Embodiment 2

[0063] refer to Figure 2 ~ Figure 3 It is the second embodiment of the present invention. This embodiment is different from the first embodiment in that it provides a verification test of a distributed frequency conversion water pump control method. In order to verify the technical effect adopted in this method, this The embodiment adopts the traditional technical scheme and the method of the present invention to carry out comparative tests, and compares the test results with the means of scientific demonstration, so as to verify the real effect of the method.

[0064] The traditional technical solution: without considering the hydraulic characteristics of the pump-containing pipe network, the water pump is used as a black box, and the PID algorithm is used to control the speed of the water pump, resulting in large fluctuations in the flow of the pipe network, and it takes a long time to stabilize.

[0065] The proposal of the present invention: according to the hydraulic cha...

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Abstract

The invention discloses a distributed variable-frequency water pump control method. The method comprises the following steps that the frequency f of a water pump is controlled, and the flow demand G of a network pipe, the pressure value P<1> of a water supply main pipe and the pressure value P<2> of a water return main pipe are obtained; according to the pressure value P<1> of the water supply main pipe and the pressure value P<2> of the water return main pipe, the pressure difference H of a water supply main pipe network and a water return main pipe network is obtained, and needed data [G, H] are obtained; the frequency f of the water pump is changed, and a plurality of sets of data [G, H] are obtained; and based on the plurality of sets of data [G, H], a pipe network performance curve is obtained through least square fitting. According to the distributed variable frequency water pump control method, only a pressure sensor and a frequency converter are needed, and the system control cost is not increased; the pipe network characteristic identification stage is rapid, and a large amount of measurement and debugging workloads are avoided; and based on the identification of pipe network characteristics, the method can better realize the control of the distributed variable frequency water pump.

Description

technical field [0001] The invention relates to the technical field of thermal energy engineering, in particular to a distributed frequency conversion water pump control method. Background technique [0002] The traditional transmission and distribution method of the central heating system is to install a circulating water pump at the heat source to drive the supply and return water to flow in the entire urban primary heating pipe network. The head is configured according to the most unfavorable loop pressure loss of the entire pipe network, and the near-end user's capital pressure must be too large. The throttling measures taken to ensure hydraulic balance will undoubtedly lead to waste of transmission and distribution energy. In order to solve this problem, the distributed frequency conversion heating system that uses the heat source circulating water pump and the user's booster water pump to work together has been widely used. There are a large number of booster pumps a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24D3/02F24D3/10F24D19/10
CPCF24D3/02F24D3/10F24D19/1012Y02B30/70
Inventor 程远军朱士澍杜立哲
Owner 西安沣东华能热力有限公司