JP3115082B2 - Operation control device for heat source equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for a heat source device used in, for example, an air conditioner, and more particularly to a heat source device for efficiently operating a heat storage tank and a heat source device using inference based on fuzzy theory. It relates to an operation control device.

[0002]

2. Description of the Related Art In air conditioning equipment such as high-rise buildings and factories, hot water or cold water is produced by heat source equipment such as a heat pump.
The obtained hot or cold water is stored in a heat storage tank, and is supplied from the heat storage tank to a heat load device such as a cooling / heating device as needed.

In recent air conditioning equipment, a plurality of heat source devices are installed to perform cooling and heating while providing flexibility and flexibility. In this case, heat is consumed by heat load devices. It is necessary to appropriately control the number of operating heat source devices according to the amount of heat and the amount of heat stored in the heat storage tank.

Therefore, conventionally, the amount of heat consumed by each heat load device is artificially predicted in advance, and a heat storage target value is set at each time based on the predicted value, while achieving the heat storage target value. The number of operating heat source devices is determined, and the heat source devices are operated based on the determined number of operating devices. Then, when the heat source device is operated, the actual heat storage amount is measured, and when a deviation occurs between the measured heat storage amount and the heat storage target value, the number of operating heat source devices is increased or decreased according to the deviation. It is carried out.

[0005]

However, the operation control apparatus for a heat source device as described above, when a deviation occurs between the target heat storage value and the actual heat storage amount, controls the increase / decrease of the number of operating units for the first time. Since it is implemented, excessive heat storage or insufficient heat storage occurs due to response delay of the control system and other factors, and it is not possible to supply heat stably to multiple heat load devices,
Further, there is a problem that the operation efficiency of the heat storage tank is reduced.

Further, the heat source device is started and stopped every time a deviation occurs between the target heat storage value and the actual heat storage amount, so that the frequency of the start and stop of the heat source device is increased,
There are problems that the running cost increases and the life of the heat source device is shortened. Furthermore, since the operator predicts the increase / decrease of the number of units while observing the state of occurrence of the deviation, the operation control of the heat source equipment depends on the experience and knowledge of the operator, and there is a problem that it is difficult to shift to an unmanned direction.

The present invention has been made in view of the above-mentioned circumstances, and predicts the amount of heat to be produced based on various types of actual plant information and target information to control the operation of heat source devices, thereby ensuring reliable operation by a target time. To ensure a stable heat supply to multiple heat load devices, and to reduce the running cost and wear of the heat source devices by reducing the number of repeated start and stop of the heat source devices. It is an object of the present invention to provide an operation control device for a heat source device that reduces the heat source device.

Another object of the present invention is to provide an operation control device of a heat source device that executes fuzzy inference using an appropriate rule base according to a plant operation mode or the like.

[0009]

First, in order to solve the above-mentioned problems, the invention according to Claims 1 and 2 uses a plurality of heat source devices to produce heat consumed by heat load devices and to store heat in a heat storage tank. In the operation control device of the heat source device for storing heat, plant information detection means for detecting a temperature profile of the heat storage tank, a heat load amount consumed by the heat load device and an operation result of the heat source device, and an operation of the heat source device Information setting means for setting information related to a target required in the plan, for example, a plant constant of a heat storage tank, a heat source device, etc., heat consumed by a heat load device, an operation target of the heat storage tank, and an operation target of the heat source device are provided. A first input related to the heat storage amount using the temperature profile and the heat load detected by the plant information detecting means and the information related to the target set by the target information setting means. An input variable calculation means for calculating a second input variable according to a variable heat load, operation of the plant
Multiple rule bases are prepared based on the policy,
Of these, the most suitable
And selecting fuzzy inference based on the first and second input variables calculated by the input variable calculating means.
Fuzzy computing means for calculating the amount of heat to be produced from the heat source device, and a heat source based on the amount of heat to be produced obtained by the fuzzy computing device and the operation results of the heat source device obtained by the plant information detecting means. A heat source operation allocating unit for creating an operation plan and a heat source control unit for operating the plurality of heat source devices based on the heat source operation plan created by the heat source operation allocating unit are provided.

[0010]

[0011]

Therefore, according to the present invention, by taking the above-described means, the input variable calculating means detects the temperature profile of the heat storage tank detected by the plant information detecting means, the heat load consumed by the heat load equipment, and the information. Using the information such as the plant constant of the heat storage tank and the heat source equipment set by the setting means, the amount of heat consumed by the heat load equipment, the operation target of the heat storage tank, and the operation target of the heat source equipment, the first heat storage amount An input variable and a second input variable related to the heat load are calculated. Then, the first input variable relating to the heat storage amount and the second input variable relating to the heat load amount are led to fuzzy calculation means, and the heat amount to be produced by the heat source device is determined using the membership function and the rule base. After the prediction, an operation plan of the heat source device is made using the heat amount to be produced by the heat source operation allocation means, the operation target, and the operation result of the heat source device detected by the plant information detection means. By controlling the operation of the heat source device based on the target time, the target heat storage amount is reliably secured at the target time, and the heat amount is stably supplied.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an operation control device for heat source equipment according to the present invention. In FIG. 1, reference numeral 1 denotes a heat source device in which a plurality of heat pumps and the like are installed. Cold water and hot water produced here are sent to a heat storage tank 2. The heat storage tank 2 has a function of storing cold water or hot water used for cooling / heating, and the stored cold water or hot water is sent to a heat load device 3 such as a cooling device.

FIG. 2 is a diagram showing a heat supply system for cold water or hot water. Cold water or hot water produced by each heat source device 1 is sent to a heat storage tank 2 by a primary water supply pump 4, where the cold water or hot water is supplied. Alternatively, heat water is stored.
The next cold water or hot water is sent to the heat load device 3 using the next water pump 5, and heat is consumed. And heat load equipment 3
The cold water or hot water heat consumed in the step is led to the heat storage tank 2 where the heat source device 1 again produces cold water or hot water at a predetermined temperature.

A plurality of thermometers 6 are installed in the heat storage tank 2. The temperature measured by these thermometers 6 is used as a heat storage tank temperature profile shown in FIG. 1 to calculate an input variable in the fuzzy heat source prediction control device 20. Introduced in means 21. In addition, a calorie meter 7 is attached to a supply path of cold or hot water to the heat load device 3, measures a heat load consumed by the heat load device 3, and similarly introduces the heat load amount into the input variable calculation unit 21. Furthermore, each of the heat source devices 1,... Is provided with an operation detector 8,..., Which detects the heat source operation results of each of the heat source devices 1, and introduces them into the heat source operation assignment means 23 in the fuzzy heat source prediction control device 20. I do.

The fuzzy heat source prediction control device 20 includes:
In addition to supplying the storage tank temperature profile, the heat source operation results, and the heat load as described above, target information necessary for executing an optimal operation plan of the plant is supplied from the target information setting means 10.

The target information setting means 10 includes equipment information setting means 11 for outputting plant constants such as the capacity of the heat storage tank 2 and the rating of the heat source equipment 1, and predicts the future heat consumed by the heat load equipment 3. Heat load prediction means 12 for outputting heat load prediction information, and heat storage target setting means 13 for outputting a target time and a target heat storage amount of the heat storage tank 2 at that time as operation target information of the heat storage tank 2; Although operation target setting means 14 for outputting operation target information, which is an operation schedule for the device 1, is provided, these means 11 to 14 may selectively use only important information as needed. Good.

On the other hand, the fuzzy heat source prediction control device 20 includes the input variable calculating means 21 and the fuzzy calculating means 2.
2, the heat source operation allocating means 23 and the heat source control means 24
Is provided.

The input variable calculating means 21 obtains input variables for fuzzy calculation from the storage tank temperature profile, the heat source operation results, the heat load and the target information from the target information setting means 10. The fuzzy calculation means 22 should produce the input variables for fuzzy calculation obtained by the input variable calculation means 21 in the heat source device 22 by inference based on fuzzy theory using the membership function shown in FIG. 3 and the rule base shown in FIG. The heat quantity is estimated and supplied to the heat source operation allocating means 23.

The heat source operation allocating means 23 uses the heat quantity to be produced input from the fuzzy operation means 22 and the heat source operation results input from the operation detectors 8,. It has a function to make a heat source operation plan by correcting the output operation target. The heat source control means 24 controls the operation of the heat source device 1 based on the heat source operation plan. Next, the operation of the fuzzy heat source prediction control device 20 will be described in detail, among the devices configured as described above.

First, in the input variable calculating means 21, as shown in FIG. 3, a heat storage tank temperature profile θi [° C] (i = 1,..., N; n is the number of cells in the heat storage tank) The heat load qnow [Gcal], the heat load prediction information q '(t) [Gcal] from the heat load prediction means 12, the target time taim [min] as the operation target from the heat storage target setting means 13, and the heat storage target Qaim [ Gcal] and the operation target Pj (t) (j = 1,..., M; m is the number of heat source devices) from the operation target setting means 14, input variables are obtained according to the following procedure.

That is, when the input variable calculating means 21 receives the heat storage tank temperature profile signal θi [° C], the current heat storage amount Qnow of the heat storage tank 2 is obtained by using the equation (1).
[Gcal] is calculated (S1).

[0023]

(Equation 1) Here, vi: the volume of the heat storage tank cell number i (corresponding to each thermometer 6) [m ³ ].

Further, based on the operation target Pj (t) inputted from the operation target setting means 14, the current time tnow [min] is obtained.
To the target time taim [min], the amount of heat Q '[Gcal] produced by the heat source device 1 is calculated according to the following equation (2) (S2).

[0025]

(Equation 2) Here, Rj is the heat production capacity [Gcal / min] of the heat source j which is a plant constant.

Subsequently, the input variable calculation means 21 calculates the heat quantity Q ″ [Gcal] predicted to be consumed by the heat load device 3 by the target time taim [min] according to the equation (3) (S3). .

[0027]

(Equation 3) Further, when the current heat storage amount Qnow, the heat source device production heat amount Q ', and the heat load device consumption predicted heat amount heat amount Q "are obtained, the following equation is obtained: Q (taim) = Qnow + Q'-Q" (4) Thus, a predicted heat storage amount Q (taim) [Gcal] at the target time taim [min] is obtained (S4).

As described above, in addition to the predicted heat storage amount Q (taim) at the target time taim, the predicted heat load value q 'at the current time tnow is obtained based on the equations (5) and (6). Input variables F1 and F2 are obtained (S5, S6), and these input variables F1 and F2 are sent to fuzzy operation means 22.

[0029]

(Equation 4)

When the fuzzy operation means 22 receives two input variables F1 and F2 from the input variable calculation means 21, the fuzzy operation means 22 obtains grades of the input variables F1 and F2 from the membership function of FIG. After calculating the output function Fout by inferring by the MIN-MAX combination type fuzzy operation using the rule base of (3), the quantity of heat Qn to be produced by the target time is calculated by the following equation: Qn = Q '× Fout [7] ca
l] and sends it to the heat source operation allocating means 23.

In the heat source operation allocating means 23, the heat quantity Qn [Gcal] to be produced obtained by the fuzzy calculating means 22 and the heat quantity Q '[Gcal] produced when the operation is performed with the operation target from the operation target setting means 14 are performed. ＱQ = Qn−Q ′ (8) After calculating the heat quantity deviation ΔQ with respect to the operation target by the following calculation, if ΔQ> 0, the operation target Pj (t) is changed to ΔQ. If Q <0, the operation target Pj (t) is shortened by ΔQ. If Q = 0, the operation target Pj (t) remains unchanged. Modify goals.

Further, in the heat source operation allocating means 23,
A heat source operation plan for the heat source device 1 is created using the heat source operation results from the operation detector 8 and sent to the heat source control means 24.
Here, in the heat source control means 24, the heat source operation allocating means 23
The operation control of the heat source device 1 is performed based on the heat source operation plan from the company.

Therefore, according to the configuration of the embodiment described above, the target heat storage amount to be achieved by the target time is predicted by inference based on fuzzy theory using the plant information, the heat storage operation target, and the heat source operation target information. Therefore, as input variables of the fuzzy calculation, in addition to the heat load and the temperature profile of the heat storage tank, which are plant information, various heat storage operation targets and heat source operation targets, etc., are synthesized. It is possible to obtain the amount of heat to be produced. Further, since the deviations of the predicted heat storage amount and the heat load deviation are used as the input variables F1 and F2, in addition to the heat storage amount at the target time predicted from the heat load prediction value, the heat source operation target, and the current heat storage amount, Therefore, by considering the difference between the heat load forecast value and the current heat load amount, the heat amount to be produced can be more accurately predicted,
Heat production without excess and deficiency can be performed, and stable heat supply can be guaranteed.

Further, when the heat source operation plan is determined by the heat source operation allocating means 23, since the operation target of the heat source device 1 and the heat source operation device are used, if only the frequency of starting and stopping the heat source device 1 can be reduced. It is possible to operate without biasing to one device.

The present invention is not limited to the above embodiment. FIG. 5 shows one rule base,
A plurality of rule bases may be prepared in accordance with the operation policy of the plant, and the operation control may be performed while selecting an appropriate rule base according to the operation mode or time zone of the cold water / hot water.

The input variables F1 and F2 are not limited to the information shown in FIG. 1. For example, a deviation of the current heat storage amount or other information may be used as an input index. A plurality of outputs may be obtained by repeating the fuzzy operation twice, and the outputs may be combined to obtain the heat quantity Qn to be produced.

Further, the inference of fuzzy operation is based on MIN-
Although the use of the MAX composite type has been described, other generally well-known safety coefficient types and weighted average types may be used. Also, for plants without heat storage tank 2,
It can be used by changing the input variables. In addition, the present invention can be implemented with various modifications without departing from the scope of the invention.

[0038]

As described above, according to the present invention, the target heat storage amount to be achieved by the target time is predicted by fuzzy inference using information such as the current plant state, equipment operation target, and equipment operation target. After that, the heat source operation plan is created, so that the amount of heat consumed by the heat load device can be reliably produced, and efficient and efficient heat production and heat supply without excess or shortage can be guaranteed.

Further, since a heat source operation plan is established based on the heat source operation target and the heat source operation results and the operation of the heat source device is controlled, the number of times of starting and stopping the heat source device can be reduced, the running cost can be reduced, and the life of the device can be reduced. Can be extended. In addition, the operation can be automatically controlled without the intervention of a specialized operator.

Further, since an appropriate rule base is selected according to the operation mode of the plant and fuzzy inference is executed, a more appropriate heat quantity to be produced for the plant can be predicted.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of an operation control device of a heat source device according to the present invention.

FIG. 2 is a supply system diagram of cold water or hot water of the plant shown in FIG.

FIG. 3 is a functional block diagram of an input variable calculating unit shown in FIG. 1;

FIG. 4 is a diagram showing a membership function used for fuzzy inference by the fuzzy operation means of FIG. 1;

FIG. 5 is a view showing a rule base used for fuzzy inference by the fuzzy operation means of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat source equipment, 2 ... Heat storage tank, 3 ... Heat load equipment, 6 ... Thermometer, 7 ... Calorimeter, 8 ... Operation detector, 10 ... Target information generation means, 11 ... Equipment information setting means, 12 ... Heat load Prediction means, 13: heat storage target setting means, 14: operation target setting means, 20: fuzzy heat source prediction control device, 21: input variable calculation means, 22: fuzzy calculation means, 23: heat source operation allocation means, 24: heat source control means .

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24F 11/02 102 F24D 11/00 F24H 1/18 302

Claims (2)

(57) [Claims] 1. An operation control device for a heat source device for producing heat consumed by a heat load device using a plurality of heat source devices and storing the heat in a heat storage tank, comprising: a temperature profile of the heat storage tank; Plant information detecting means for detecting the amount of heat load to be performed and the operation results of the heat source equipment, target information setting means for setting information relating to a target necessary for an operation plan of the heat source equipment, and detection by the plant information detecting means. A first input variable related to the heat storage amount and a second input variable related to the heat load amount are calculated using the temperature profile, the heat load amount, and the information related to the target set in the target information setting means. Input variable calculation means and multiple rule bases based on plant operation policy
Of the plant operation and time mode
Fuzzy inference based on the first and second input variables calculated by the input variable calculating means , and selecting the optimal rule base from the input source code to obtain the amount of heat to be produced from the heat source equipment. An operation control device for a heat source device, comprising: operation means for controlling the operation of the heat source device based on the amount of heat to be produced determined by the inference. Wherein a thermal load device using a plurality of heat source apparatuses vanishing
Operation control device of the heat source device storing heat producing heat amount spent in the thermal storage tank, the temperature profile of the heat storage tank, the thermal load device in detecting the operating performance of the thermal load and the heat source device consumed Equipment information setting means for setting plant constants such as the heat storage tank and heat source equipment; heat load prediction setting means for predicting and setting the amount of heat consumed by the heat load equipment; Heat storage target setting means for setting an operation target; operation target setting means for setting an operation target of the heat source device; temperature profile and heat load detected by the plant information detecting means; and plants output from the various setting means. An input for calculating a first input variable related to heat storage and a second input variable related to heat load using a constant, a predicted heat quantity, an operation target, and an operation target. The number calculation means, a plurality of rule-based, based on the operational policy of the plant
Of the plant operation and time mode
Select the best rule-based determined from de, first and second input variables to the group calculated by the input variable calculating means
Fuzzy arithmetic means for performing fuzzy inference based on the heat quantity to be produced from the heat source equipment, the heat quantity to be produced obtained by the fuzzy computation means, and the operation results of the heat source equipment obtained by the plant information detection means. Heat source operation allocating means for creating a heat source operation plan based on the heat source operation plan, and a heat source control means for operating the plurality of heat source devices based on the heat source operation plan created by the heat source operation allocating means. Operation control device for heat source equipment.