Intelligent heat exchanging station secondary network average temperature control method

Abstract

An intelligent heat exchanging station secondary network average temperature control method includes the steps as follows, relevant parameters of a heat exchanging station are acquired; historical data are acquired, and the relationship between secondary network average temperature and outdoor temperature is obtained; actually measured data of an actual heat supplying building are acquired; the secondary network average temperature Tw2arg is calculated; the equivalent outdoor temperature Toe is calculated; a secondary network average temperature set value Tw2argsp is calculated; a secondary network average temperature error eTw2arg is calculated; an indoor temperature set value Tzsp is given; an indoor temperature departure eTz is calculated; two error weight w1 and w2 are set; a dual-weight error value eT is calculated; a heat exchanging station secondary network average temperature PI controller output signal u is calculated; the output signal u of a secondary network average temperature PI controller is calculated through the secondary network average temperature PI controller, the calculated output signal u is transmitted to a primary side electric adjusting value of the heat exchanging station; and control operation is executed, the opening degree of the electric adjusting valve is adjusted, and the dual control requirements of the secondary network average temperature andthe indoor temperature are met.

Description

technical field [0001] The invention relates to the technical field of heat exchange station control, in particular to a method for controlling the average temperature of a secondary network of an intelligent heat exchange station. Background technique [0002] Due to the promotion and influence of various factors in urban development, such as urbanization rate and environmental protection requirements, the scale of district heating systems has gradually expanded in the past 20 years. Thousands, many heat exchange stations have also achieved an unattended state. Observing and analyzing the historical data of the heat exchange station will reveal that the output heat of the heat exchange station does not meet the thermal and hydraulic balance goals of the heating network. For example, some heat exchange stations are controlled by the return water temperature of the secondary network, but the return water temperature is the result of all the heat transfer processes of the sec...

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Problems solved by technology

[0004] (1) Primary network constant flow control: it belongs to the heat source concentrated mass adjustment method, and the existing problems are: 1) The thermal characteristics of each heat exchange station are not compensated in the control system; 2) The power consumption cannot be reduced by changing the circulation flow; 3) The user's free heat has not been utilized; 4) The indoor temperature fluctuates greatly;

[0005] (2) Water supply temperature control of the secondary network: the heat supply is adjusted through the water supply temperature of the secondary network. The disadvantages are: 1) The set value of the water supply temperature is related to the circulation flow of the secondary network, but the theoretical circulation flow of the secondary network is not easy to accurately determine ; 2) The influence of indoor free heat on heat supply is not considered; 3) The indoor temperature fluctuates greatly;

[0006] (3) The average temperature control of the secondary network: the average temperature of the supply and return water of the secondary network is determined by measuring the outdoor temperature, which is used as the heat supply control index. The disadvantages are: 1) the control system does not perform indoor free heat compensation; 2) Indoor temperature fluctuations are relatively large; 3) It is difficult to obtain the average temperature setting index of the secondary network; 4) There is no indoor temperature compensation;

[0007] (4) Secondary network return water temperature control: Set the secondary network return water temperature value through the outdoor temperature as a control index. The disadvantages are: 1) The results of all heat transfer processes at the secondary network return water temperature, Including non-controllable factors, therefore, it is theoretically impossible to obtain the set value of the return water temperature of the secondary network; 2) The temperature range of the return water of the secondary network is small, and the control accuracy is low; 3) The inherent characteristics and operating characteristics of the heating system And dynamic characteristics determine the hysteresis of the system response, resulting in the temperature error of the secondary network return water; 4) The indoor temperature fluctuates greatly;

The disadvantages are: 1) Larger temperature difference may lead to more serious hydraulic imbalance of the secondary network; 2) No consideration of the qualitative component of the heat (average temperature of the secondary network, which determines the indoor temperature value); 3) Free heat is not considered; 4 ) The indoor temperature fluctuates greatly; 5) It is necessary to determine the temperature difference setting value according to the actual user properties and the terminal device;

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