CN111895629B - Universal equipment end implementation method for central air conditioner to participate in demand response - Google Patents
Universal equipment end implementation method for central air conditioner to participate in demand response Download PDFInfo
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- CN111895629B CN111895629B CN202010712141.1A CN202010712141A CN111895629B CN 111895629 B CN111895629 B CN 111895629B CN 202010712141 A CN202010712141 A CN 202010712141A CN 111895629 B CN111895629 B CN 111895629B
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- water
- chilling unit
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- water chilling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
Abstract
The invention relates to the fields of central air conditioners, demand response and the like, and provides a universal equipment end implementation method for the central air conditioner to participate in the demand response, which comprises the following steps: calculating the actual cold load of the water chilling unit under the current operating condition; estimating the load power of the water chilling unit under the current condition according to the fed back cold load value; calculating the load power required to be adjusted by the water chilling unit based on a given demand response instruction; calculating a cold load modification value of the water chilling unit corresponding to the adjusted load power; calculating a return water temperature set value of the chilled water corresponding to the adjusted cold load modification value; the chilled water return temperature sensor is adjusted, so that the power of the control system of the water chilling unit is adjusted according to the set value of the chilled water return temperature, and a corresponding demand response instruction is executed. The invention realizes the purpose of power adjustment only by configuring the temperature sensing value, has strong operability, is suitable for most central air conditioner types and has better universality.
Description
Technical Field
The invention relates to the fields of central air conditioners, demand response and the like, in particular to a universal equipment end implementation method for the central air conditioner to participate in the demand response.
Background
With the increasingly prominent energy problem, new energy sources such as wind power, photovoltaic and the like have higher and higher permeability in an electric power system. The output of new energy such as wind, light and the like has common characteristics: randomness, volatility and intermittence, and higher requirements are provided for the flexible regulation capacity of the power system. The demand response is one of core technologies of the smart grid, and the power supply and demand condition of the power can be relieved by adjusting the power consumption load power of the user, so that flexible resources are provided for the system. The central air conditioner load has large mining potential and flexible scheduling mode, and can be used as an important demand response resource.
At present, most of equipment end schemes aiming at the participation of a central air conditioner in demand response realize load power adjustment by directly controlling parameters such as a current value or a temperature value and the like through accessing a control system. Since the control system needs to be accessed, the scheme needs to be configured according to the communication protocol of the control system. However, the related protocols and control interfaces of the central air conditioners produced by different manufacturers and at different periods are greatly different, and the schemes need to be configured one by one, so that the universality of the schemes is limited.
Disclosure of Invention
Aiming at the defect that the prior technical scheme is lack of universality, the invention provides a universal equipment end implementation method for the central air conditioner to participate in demand response, which can be adapted to more central air conditioner types, achieves the aim of adjusting the load power of the air conditioner and has better universality.
The invention solves the problems by adopting the following technical scheme.
A method for realizing equipment end participation of a universal central air conditioner in demand response comprises the following steps:
(1) calculating the actual cold load Q of the water chilling unit under the current operating condition;
(2) estimating the load power L of the water chilling unit under the cold load;
(3) according to the demand response scheduling instruction, determining the load power L to be adjusted by the water chilling unit when the demand response is executedDR；
(4) According to the load power L obtained in the step (3) and adjusted by the water chilling unitDRCalculating the corresponding cold load modification value Q of the water chilling unitDR；
(5) According to the cold load modification value Q of the water chilling unit obtained in the step (4)DRCalculating the corresponding return water temperature set value of the chilled water
(6) Adjusting the return chilled water temperature sensor, modifying the value fed back to the control system of the water chilling unit, and enabling the control system of the water chilling unit to set the return chilled water temperature according to the set value
And performing power adjustment so as to execute the corresponding demand response instruction.
In the technical scheme, the actual cold load Q of the water chilling unit is calculated according to the following formula
Q＝(Tf2-Tf1)×m×1.19
In the formula Tf2Is the return water temperature of chilled water, Tf1The temperature of the supplied water is the chilled water temperature, and m is the flow of the chilled water main pipe.
In the technical scheme, the load power L of the water chilling unit is calculated according to the following formula
L＝a0+a1(Tc1-Tf1)+a2(Tc1-Tf1)2+a3Q+a4Q2+a5Q(Tc1-Tf1)
In the formula Tc1Supply water temperature to cooling water, a0、a1、a2、a3、a4、a5Are energy consumption model coefficients.
In the technical scheme, the load power L to be adjusted by the water chilling unit when the demand response is executed is calculated according to the following formulaDR
LDR＝L-ΔL
In the formula, Δ L is the load power value which is required by the issued demand response instruction and is reduced by the water chilling unit.
In the above technical solution, the calculated cold water set cold load modification value QDRThe following relationship is satisfied:
in the above technical solution, according to the followingCalculating the return water temperature set value of the chilled water by a formula
Adjusting the return chilled water temperature sensor, modifying the value fed back to the control system of the water chilling unit, and enabling the control system of the water chilling unit to set the return chilled water temperature according to the set value
And performing power adjustment so as to execute the corresponding demand response instruction.
The invention has the following advantages: the temperature sensor generally adopts analog signals for transmission, can complete adjustment through proper sensor configuration, and is easy to realize and strong in operability; and because most air conditioners all rely on external sensor to carry out temperature control, therefore this scheme can adapt more models, has better commonality.
Drawings
FIG. 1 is a schematic diagram of the scheme of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The central air-conditioning system mainly comprises a water chilling unit, a cooling water system and a chilled water system, wherein the water chilling unit transfers heat energy on an evaporator side to a condenser side under a refrigeration working condition through a compressor, and the water chilling unit is a main load of the central air-conditioning, accounts for about 60-70% of the total load, and is a main object for implementing demand response on the central air-conditioning.
The embodiment of the invention provides a method for realizing participation of a universal central air conditioner in demand response at a device end, and a scheme schematic diagram is shown in figure 1. When the return chilled water temperature sensor is adjusted to adjust the return chilled water temperature fed back to the control system to 14 ℃ to 13 ℃, if the supply chilled water temperature is 9 ℃, the flow rate of the main chilled water pipe is 215m3And h, calculating by the control system to obtain a cold load modification value of the water chilling unit as follows:
QDR＝(13-9)×215×1.19＝1023.4(kW)
and the water chilling unit control system outputs power according to the calculated cold water unit cold load modification value. The mathematical model of the energy consumption of the water chilling unit is as follows:
when the cooling load fed back to the control system is 1023.4kW, if the supply water temperature of the cooling water is 33 ℃, the load power to be adjusted by the water chilling unit when the demand response is executed is as follows:
LDR＝203.70kW
and if the chilled water return water temperature sensor is not adjusted, namely the actual chilled water return water temperature is fed back, the actual load power of the water chilling unit is as follows:
L＝242.29kW
therefore, the power adjustment of the water chilling unit is realized by adjusting the value of the chilled water return temperature sensor which is fed back to the control system, namely, a demand response instruction is executed. The load power down-regulation value is as follows:
ΔL＝242.29-203.70＝39.09kW
details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the present invention is not limited to the above-described embodiments, and various modifications are possible. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention should be considered to be within the protection scope of the present invention.
Claims (3)
1. A method for realizing equipment end participation of a universal central air conditioner in demand response is characterized by comprising the following steps:
(1) calculating the actual cold load Q of the water chilling unit under the current operating condition;
(2) estimating the load power L of the water chilling unit under the cold load; calculating the load power L of the water chilling unit according to the following formula
L＝a0+a1(Tc1-Tf1)+a2(Tc1-Tf1)2+a3Q+a4Q2+a5Q(Tc1-Tf1)
In the formula Tc1Supply water temperature to cooling water, a0、a1、a2、a3、a4、a5Is the energy consumption model coefficient;
(3) according to the demand response scheduling instruction, determining the load power L to be adjusted by the water chilling unit when the demand response is executedDR(ii) a Calculating the load power L to be adjusted by the water chilling unit when the demand response is executed according to the following formulaDR
LDR＝L-ΔL
In the formula, the delta L is a load power value which is required by the issued demand response instruction and is reduced by the water chilling unit;
(4) according to the load power L obtained in the step (3) and adjusted by the water chilling unitDRCalculating the corresponding cold load modification value Q of the water chilling unitDR(ii) a Calculated cold water set cold load modification value QDRThe following relationship is satisfied:
(5) according to the cold load modification value Q of the water chilling unit obtained in the step (4)DRCalculating the corresponding return water temperature set value of the chilled water
(6) Adjusting the return chilled water temperature sensor, modifying the value fed back to the control system of the water chilling unit, and enabling the control system of the water chilling unit to set the return chilled water temperature according to the set value
And performing power adjustment so as to execute the corresponding demand response instruction.
2. The method for realizing the equipment side participating in the demand response of the general central air conditioner according to claim 1, wherein the method comprises the following steps: calculating the actual cooling load Q of the water chilling unit according to the following formula
Q＝(Tf2-Tf1)×m×1.19
In the formula Tf2Is the return water temperature of chilled water, Tf1The temperature of the supplied water is the chilled water temperature, and m is the flow of the chilled water main pipe.
3. The method for realizing the equipment side participating in the demand response of the general central air conditioner according to claim 1, wherein the method comprises the following steps: calculating the return water temperature set value of the chilled water according to the following formula
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