WO2020134742A1

WO2020134742A1 - Compressor operation control method and control apparatus, and heat exchange system

Info

Publication number: WO2020134742A1
Application number: PCT/CN2019/119857
Authority: WO
Inventors: 森山昌幸; 徐峰; 王达; 吴晶晶; 张宏胜
Original assignee: 麦克维尔空调制冷(武汉)有限公司
Priority date: 2018-12-28
Filing date: 2019-11-21
Publication date: 2020-07-02
Also published as: CN111380184A

Abstract

The present application provides a compressor operation control method and control apparatus, and a heat exchange system. The control apparatus comprises: a first calculation unit, which calculates a user-side load of a heat exchange device in a predetermined moment or a predetermined time period according to a history record of the user-side load of the heat exchange device; and a first control unit, which controls the operation of a compressor of the heat exchange device according to the calculated user-side load. According to the present application, the cooling capacity matched to the user-side load can be timely provided, so as to improve the operating efficiency of the heat exchange system.

Description

Compressor operation control method, control device and heat exchange system

Technical field

The present application relates to the field of control technology, in particular to a compressor operation control method, control device and heat exchange system.

Background technique

The central air-conditioning system is usually composed of a chiller (cold source), a cooling water system, a chilled water system, and a terminal air conditioning device. Existing central air conditioning systems generally use the return water temperature of chilled water as the basis for the load change of the chiller. On the one hand, it takes a certain time for the chilled water to reach the chilled water return port after heat exchange at the end of the air conditioner. The chiller is based on the chilled water outlet temperature The load adjustment made has a certain lag. Existing chiller compressors are started according to the target temperature requirement of chilled water. After starting, they are first increased to full-load operation. After reaching the target water temperature, the load is reduced and stopped.

It should be noted that the above introduction to the technical background is set forth only to facilitate a clear and complete description of the technical solutions of the present application and to facilitate understanding by those skilled in the art. It cannot be considered that the above technical solutions are known to those skilled in the art simply because these solutions are described in the background part of the present application.

Summary of the invention

The inventor of the present application found that the existing central air conditioning system uses the return water temperature of the chilled water as the basis for the load change of the chiller to control the compressor, which has certain defects. For example, it takes a certain amount of time for the chilled water to reach the chilled water return port after heat exchange at the end of the air conditioner. The load adjustment made by the chiller based on the chilled water return temperature has a certain hysteresis, which is prone to the chiller output and user load. Matching situation.

The embodiments of the present application provide a compressor operation control method, a control device, and a heat exchange system. By referring to the user-side load history of the heat exchange equipment, the user-side load is predicted, and the heat exchange is based on the predicted user-side load. The operation of the compressor of the equipment is controlled, so that the cooling capacity that matches the load on the user side can be provided in time, and the operation efficiency of the heat exchange system can be improved.

According to a first aspect of the embodiments of the present application, a compressor operation control device is provided for controlling the operation of a compressor of a heat exchange device. The control device includes:

A first calculation unit, which calculates the user-side load of the heat exchange device at a predetermined time or within a predetermined time period based on the historical record of the user-side load of the heat exchange device;

The first control unit controls the operation of the compressor of the heat exchange device based on the calculated user-side load.

According to a second aspect of the embodiments of the present application, there is provided a heat exchange system, including the control device described in the first aspect above, and a heat exchange device, wherein the control device controls the operation of the compressor of the heat exchange device .

According to a third aspect of the embodiments of the present application, a compressor operation control method is provided for controlling the operation of a compressor of a heat exchange device. The control method includes:

Calculate the user-side load of the heat exchange device at a predetermined time or within a predetermined time period according to the historical record of the user-side load of the heat exchange device;

Based on the calculated user-side load, the operation of the compressor of the heat exchange device is controlled.

The beneficial effect of the embodiment of the present application lies in: predicting the user-side load by referring to the history record of the user-side load of the heat exchange device, and controlling the operation of the compressor of the heat-exchange device based on the predicted user-side load, thereby enabling Timely provide the cooling capacity matching the load on the user side to improve the operating efficiency of the heat exchange system.

With reference to the following description and drawings, specific embodiments of the present application are disclosed in detail, and the manner in which the principles of the present application can be adopted is indicated. It should be understood that the embodiments of the present application are not thus limited in scope. The embodiments of the present application include many changes, modifications, and equivalents within the scope of the appended notes.

Features described and/or illustrated for one embodiment may be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or substituted for features in other embodiments .

It should be emphasized that the term "comprising" as used herein refers to the presence of features, whole pieces, steps or components, but does not exclude the presence or addition of one or more other features, whole pieces, steps or components.

BRIEF DESCRIPTION

Elements and features described in one drawing or one embodiment of the examples of the present application may be combined with elements and features shown in one or more other drawings or embodiments. In addition, in the drawings, similar reference numerals indicate corresponding parts in several drawings, and may be used to indicate corresponding parts used in more than one embodiment.

The included drawings are used to provide a further understanding of the embodiments of the present application, which form a part of the description, are used to illustrate the embodiments of the present application, and together with the text descriptions explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without paying any creative work, other drawings can also be obtained based on these drawings. In the drawings:

FIG. 1 is a schematic diagram of the control device of Embodiment 1 of the present application;

2 is a schematic diagram of the compressor when it is started according to the existing method and when it is started according to this embodiment;

3 is a schematic diagram of the heat exchange system of Example 2 of the present application;

FIG. 4 is a history record of the user-side load at each time in Embodiment 2 of the present application, and calculates the load on the user-side at each time in the next hour;

FIG. 5 is the change in the load on the user side per hour in a day of Example 2 of the present application;

FIG. 6 is the variation of the load on the user side within one month of Embodiment 2 of the present application;

7 is a monthly variation of user-side load during the whole year of Example 2 of this application;

FIG. 8 is a schematic diagram of the user-side load changes in the first year, the second year, and the third year of the second embodiment of the present application year by year;

9 is a schematic diagram of the control method of Embodiment 3 of the present application;

FIG. 10 is another schematic diagram of the control method according to Embodiment 3 of the present application.

detailed description

With reference to the drawings, the foregoing and other features of the present application will become apparent through the following description. In the specification and the drawings, specific implementations of the present application are disclosed in detail, which indicate some of the implementations in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described implementations. The application includes all modifications, variations, and equivalents that fall within the scope of the attached note. Various embodiments of the present application will be described below with reference to the drawings. These embodiments are only exemplary, and are not limitations of the present application.

In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different elements in terms of titles, but do not mean the spatial arrangement or chronological order of these elements, and these elements should not be used by these terms Restricted. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having" and the like refer to the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.

In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms, which should be broadly understood as "a" or "a class" rather than being limited to the meaning of "a"; in addition, the term "the" "It should be understood to include both singular and plural forms unless the context clearly indicates otherwise. In addition, the term "based on" should be understood as "based at least in part on..." and the term "based on" should be understood as "based at least in part on" unless the context clearly indicates otherwise.

In the embodiment of the present application, the heat exchange device may be a chiller, which uses water as a coolant. In addition, the embodiments of the present application are not limited to this, the heat exchange equipment may also be other types of units, and the unit may use other types of refrigerants than water.

Example 1

Embodiment 1 of the present application provides a compressor operation control device, which is used to control the operation of a compressor of a heat exchange device.

FIG. 1 is a schematic diagram of the control device of this embodiment. As shown in FIG. 1, the control device 10 includes a first calculation unit 11 and a first control unit 12.

In this embodiment, the first calculation unit 11 calculates the user-side load of the heat exchange device at a predetermined time or within a predetermined period of time based on the history of the user-side load of the heat exchange device; the first control unit 12 calculates according to the first The user-side load calculated by the unit 11 controls the operation of the compressor of the heat exchange device.

According to this embodiment, the control device predicts the user-side load by referring to the history of the user-side load of the heat exchange equipment, and controls the operation of the compressor of the heat exchange equipment based on the predicted user-side load. Since the control device of this embodiment does not use the return temperature of the chilled water as the basis for determining the load on the user side, it is avoided that the chilled water flows to the chilled water return port after heat exchange at the end of the heat exchange equipment. Lag, so the load on the user side can be calculated in time, and the operation of the compressor can be controlled in time, so that the cooling capacity of the heat exchange equipment matches the load on the user side, thereby improving the operating efficiency of the heat exchange system.

In this embodiment, the predetermined time may be, for example, the current time, or a certain time after the current time. The predetermined time period may be, for example, a period of time starting from the current time, or a period of time starting from a certain time after the current time.

In this embodiment, the history record of the user-side load of the heat exchange device may include: the history record of the user-side load at a predetermined time interval of at least one hour, and/or the average value of the user-side load in each hour of at least one day Historical records, and/or historical records of the average value of the user-side load for at least one day of the week, and/or historical records of the average value of the user-side load for each day of the year, and/or at least one of the user-side load The historical record of the average value in each month of the year, etc.

In one embodiment, the first calculation unit 11 may calculate the user-side load at the time or time period corresponding to the predetermined time or time period in the history of the user-side load, at the predetermined time or time period The load on the user side of the heat exchange equipment. For example, the historical record of user-side load is the average value of user-side load in each hour of each day in N-2 and N-1, and the predetermined time period is, for example, the Pth hour of the Mth month, Lth day of the Nth year In this way, the first calculation unit 11 can load the user side Q1 of the Pth hour of the Lth day of the Mth month of the N-1th year and the user side of the Pth hour of the Lth day of the Mth month of the N-2th year The load Q2 calculates an average value, and the average value is the user-side load Q calculated by the first calculation unit 11 at the Pth hour of the Nth, Mth, Lth, and Lth days, where the average value may be, for example, an arithmetic average, a geometric average, or Root mean square average, etc.

In addition, the calculation manner of the first calculation unit 11 of this embodiment may not be limited to this, for example, the first calculation unit 11 may select one of Q1 and Q2 as Q, or the first calculation unit 11 may be based on Q1 and Q2 Fitting the curve of Q with the change of year to calculate Q. In addition, in the above example, the history records of the user-side load include Q1 and Q2, and this embodiment is not limited thereto. For example, the history records of the user-side load may also include user-year loads of more years.

In this embodiment, the first calculation unit 11 may also calculate the user-side load according to the environmental parameters corresponding to the historical record and the environmental parameters at the predetermined time or within a predetermined time period, that is, the first calculation unit 11 The historical record of the user-side load of the heat exchange device, the environmental parameters corresponding to the historical record, and the environmental parameters at the predetermined time or within a predetermined time period, calculate the user-side load. The environmental parameter may be an environmental parameter outside the space where the end (ie, user side) of the heat exchange device is located, for example, an outdoor environmental parameter. The environmental parameters are, for example, temperature, and/or humidity.

Therefore, when calculating the user-side load, the factors of the environmental parameters are also taken into consideration, so that the user-side load can be calculated more accurately, and the operation of the compressor can be controlled more accurately.

In one embodiment, the first calculation unit 11 may calculate the user-side load at the time or time period corresponding to the predetermined time or time period in the history of the user-side load, at the predetermined time or time period The estimated value of the user-side load of the heat exchange device Qy, and according to the environmental parameters at the time or time period corresponding to the predetermined time or time period, and the environmental parameters at the predetermined time or time period, for The estimated value is corrected, and the result of the correction is used as the user-side load.

For example, the load on the user side at the Pth hour of the Lth day of the Mth month of the N-1 year is Q1, and the environmental parameter E1 is the temperature T1 and the humidity H1; the user side at the Pth hour of the Lth day of the Mth month of the N-2 year Load Q2, environmental parameter E2 is temperature T2 and humidity H2; the actual detected environmental parameter E at the predetermined time or within a predetermined period of time is temperature T and humidity H; the first calculation unit 11 calculates the arithmetic average of Q1 and Q2 as The estimated value of the user-side load Qy at the Pth hour of the Nth, Mth, Lth, and Lth days, and the first calculation unit 11 corrects Qy based on T1, H1, T2, H2, and T and H to obtain The result of the correction, which is taken as the user-side load Q.

The first calculation unit 11 can correct Qy based on the following formula (1):

Q=f(E1, E2, E, Qy) (1)

For example, the following formula (2) may be a specific form of formula (1):

Where α and β are the first weighting coefficient and the second weighting coefficient, respectively, which can be preset; Ty is the average of T1 and T2, for example, arithmetic average, etc.; Hy is the average of H1 and H2, for example, Arithmetic average, etc.

In addition, there are E1 and E2 in the above formula (1), and the present embodiment may not be limited to this, for example, the formula (1) has one of E1 and E2.

In addition, the above formula (2) is only an example, and formula (1) may also have other forms, which is not limited in this embodiment.

In a specific example, when the predetermined time or a predetermined time period arrives, the first calculation unit 11 may calculate Qy, and correct the estimated value Qy according to the environmental parameters detected at the predetermined time or the predetermined time period to Q is obtained, and the first control unit 12 controls the operation of the compressor of the heat exchange device according to Q.

In another specific example, before the predetermined time or predetermined time period arrives, the first calculation unit 11 may calculate the estimated value Qy of the user-side load according to the historical record of the user-side load. The estimated value Qy pre-adjusts the operation of the compressor of the heat exchange device; and, when the predetermined time or predetermined period of time arrives, the first calculation unit 11 based on the environmental parameters detected at the predetermined time or predetermined period of time, The estimated value Qy is corrected to obtain Q, and based on the pre-adjustment, the first control unit 12 further controls the operation of the compressor of the heat exchange device according to Q. Therefore, through the pre-adjustment, the compressor can be controlled in a more timely manner, and the response speed of the adjustment of the compressor to environmental parameters can be improved.

Next, taking the control of the compressor of the heat exchange device at the time of starting as an example, the effect of this embodiment will be described.

FIG. 2 is a schematic diagram when the compressor is started in the existing manner and in the manner of this embodiment. In FIG. 2, 21 is a schematic diagram of the compressor using the existing method for starting, and 22 is a schematic diagram of the compressor using the method of this embodiment for starting.

In Figures 21 and 22, RLA represents the unit's full load current or rated load current. The 100% and 60% of the ordinate axis represent the actual load current of the unit as a percentage of the rated load current (RLA). In FIG. 2, ELWT represents the evaporator outlet water temperature, and the ELWT target value represents the evaporator outlet water temperature target value.

As shown in Figure 2, when the compressor is started for the first time, it can be started in the existing way. For example, it is started according to the water temperature requirements. After starting, it is increased to the full load operation to reach the water temperature and then reduced to stop. The start to stop process is detected The temperature and humidity of the outdoor temperature reached are recorded.

When the compressor is started under the control of the control device 10 of this embodiment, the first calculation unit 11 is based on the user-side load at the previous start, and based on the currently detected outdoor temperature and humidity and the recorded during the last start For outdoor temperature and humidity, correct the user-side load to obtain the corrected user-side load. The first control unit 12 uses the user-side load as the upper load increase limit when the compressor is restarted, and the unit operates according to the user load limit after startup. As can be seen from FIG. 2, compared to the initial startup under the control of the control device 10 of this embodiment, the compressor of the heat exchange device can continue to operate in the low speed region, that is, the region 221 in FIG. 2, compression The machine operates more efficiently and the fluctuation of the water temperature on the user side is also smaller. In contrast, according to the method of the prior art, the compressor is directly increased to full load after starting. In the area 211 of FIG. 2, the operation efficiency of the unit is low, the water temperature fluctuation on the user side will be relatively large, and the compressor will frequently start and stop.

In this embodiment, when the user-side load of the heat exchange device calculated by the first calculation unit 11 at a predetermined time or within a predetermined period of time is lower than the lower operating limit of the compressor, the first control unit 12 The machine issues a command to stop the compressor, thereby preventing the compressor from continuously reducing load and causing surge.

The surge of the compressor is explained as follows.

When the load on the user side is reduced, in order to match the cooling provided by the heat exchange equipment with the load on the user side, the compressor reduces the air intake of the compressor by reducing the compressor suction or reducing the frequency and other measures to reduce the heat exchange equipment. Cooling capacity. When the user-side load is very low, the compressor's air intake is less. Centrifugal compressors are speed type compressors, which work to increase the kinetic energy of the gaseous refrigerant through the impeller, and then convert the kinetic energy into pressure energy through a diffuser chamber. Because the diffuser channel of the centrifugal compressor is designed based on full load, the suction volume is large when the load is full, and the compressor is not prone to surge; when the load is reduced, the compressor suction volume is reduced, the flow area of the diffuser channel is unchanged, and the gas The flow rate in the channel decreases rapidly, and the gas cannot flow out from the outlet of the diffuser channel, and the phenomenon that the gas of the condenser flows back to the compressor, that is, surge. Although the surge can be alleviated by reducing the flow area of the diffuser channel, so that it can operate normally when the user load is reduced, but when the user-side load is further reduced and the compressor suction volume flow is further reduced, the surge will still occur Vibration, so each compressor has its lower operating limit, below which it is prone to surge.

In this embodiment, the compressor operation control device 10 can predict the user-side load in advance based on the historical operation record. When the predicted load is lower than the lower limit of the compressor operation, the first control unit 12 can directly issue the load without reducing the load. The stop command can prevent the compressor from continuously reducing load and causing surge.

In addition, in the present embodiment, the compressor operation control device 10 can also combine the data monitored in real time such as the compressor operation current to prevent surge. For example, based on historical records, the first calculation unit 11 can calculate that if the compressor continues to reduce load, surge will occur at a predetermined time or within a predetermined time period, and the calculation result can be performed with the real-time monitoring data of the compressor operating current In contrast, if the real-time monitoring data of the compressor operating current is that the operating current continues to decrease, the calculation result of the first calculation unit 11 and the real-time monitoring data of the compressor operating current can be mutually verified, and the first control unit 12 determines that the compressor really needs Stop early, otherwise surge will occur, so the first control unit 12 issues a stop command. By comparing the calculation results with the real-time monitoring data such as the compressor operating current, the phenomenon of erroneous shutdown can be prevented, and the compressor anti-surge logic can be more timely and accurate.

In this embodiment, the first calculation unit 11 may also calculate the user-side load of the heat exchange device at a predetermined time or within a predetermined time period according to the change trend of the historical record of the user-side load, that is, the first calculation unit 11 may According to the historical record of the user-side load and the change trend of the historical record, calculate the user-side load of the heat exchange device at a predetermined time or within a predetermined time period. For example, in the first 4 months of the Nth year, the monthly average of the user-side load of each month is increased by about x% compared to the same period in the N-1 year. Therefore, the first calculation unit 11 can change the N-th Multiply the average of the user-side load at the P1 hour on the L1 day in the fifth month of the year by (1+x%) as the user-side load at the P1 hour on the L1 day in the fifth month of the Nth year .

In this embodiment, as shown in FIG. 1, the control device 10 may further include: an information analysis unit 13. The information analysis unit 13 is used to collect user-side load information of the heat exchange device, and analyze the collected user-side load information to generate a history record of the user-side load of the heat exchange device.

For example, the information analysis unit 13 may collect information on the load on the user side every fixed time (for example, the fixed time is 5 minutes). The analysis performed by the information analysis unit 13 is, for example: processing the user-side load per hour to obtain the average load of the compressor in each hour of each day; and/or processing the user-side load within each day to Obtain the average load of the compressor in each day of each week; and/or, process the user-side load in each week to obtain the average load of the compressor in each week of each month; and/or, for each The user-side load is processed within a month to obtain the average load of the compressor in each month of each year.

In the present embodiment, the above-mentioned processing of the information analysis unit 13 may be, for example, a weighted average of the user-side load, or a recalculation of the area by integration.

In this embodiment, the user-side load information collected by the information analysis unit 13 can be calculated in various ways, for example: based on the temperature difference between the inlet and outlet of the chilled water and the mass flow rate of the chilled water; or, based on the compressor The real-time current when the motor is running and the value of the percentage of the rated load of the motor are calculated. The user-side load information may be calculated by the information analysis unit 13 or calculated by other units in the control device 10, such as a compressor operating state measurement and control device (not shown).

In this embodiment, the information analysis unit 13 may also collect and analyze the environmental parameter information, and the analysis method may refer to the method for analyzing the user-side load information. In addition, the environmental parameter information may come from sensors provided in the environment (for example, outdoors).

In this embodiment, the control device 10 can control the operation of the compressor of one heat exchange device, and can also control the operation of the compressors of more than two heat exchange devices operating in parallel.

When the control device 10 is used to control the operation of the compressors of two or more heat exchange equipment operating in parallel, the first calculation unit 11 may be based on the historical records of the sum of the user-side loads of the two or more heat exchange equipment and each The relationship between the heating energy efficiency ratio (COP, Coefficient of Performance) of the heat exchange equipment and the load, for each heat exchange equipment, the load percentage of the heat exchange equipment during operation is calculated, so that the heat exchange system containing the two or more heat exchange equipment Has the largest heating energy efficiency ratio, and the first control unit 12 controls the operation of the compressor of each heat exchange device according to the load percentage calculated by the first calculation unit 11.

Taking the joint operation of three heat exchange equipment as an example, the joint operation of more heat exchange equipment is similar to this. Assume that the rated loads of the three heat exchange equipment are A, B, and C, and the load percentages of the compressors of the three heat exchange equipment during operation are a, b, and c, respectively, and the value ranges of a, b, and c are respectively a = 0 or 10% ≤ a ≤ 100%, b = 0 or 10% ≤ b ≤ 100%, c = 0 or 10% ≤ c ≤ 100%; a, b, c equal to zero means the compressor is in a stopped state, 10 %≤a, b, c≤100% is to prevent the surge when the compressor is running; the first calculation unit 11 calculates the sum of the user-side load at the predetermined time according to the history of the user-side load of the three heat exchange equipment as Q , The relationship between the COP and load of the three heat exchange equipment can be expressed as a curve, where each curve can be obtained by fitting the data tested by the manufacturer of the heat exchange equipment, and the respective change relations are COPa=f(a), COPb=f(b), COPc=f(c), then the first calculation unit 11 sets a, b, and c for the three heat exchange equipment according to the following conditions (3) and (4):

a*A+b*B+c*C=Q (3)

MAX _COP = Q\[(a*A)\COPa+(b*B)\COPb+(c*C)\COPc] (4)

Among them, MAX _COP means that the COP of the heat exchange system including the three heat exchange equipment reaches the maximum value.

Therefore, according to the user-side load of each heat exchange device, the control device can schedule the load situation on the user side at a predetermined time or within a predetermined period of time, and thus can reasonably coordinate the startup, increase, decrease, and shutdown of each heat exchange device in the machine room. The heat exchange equipment can work under the maximum load of the COP, so as to ensure energy-saving and efficient operation under the condition of matching with the user load.

In addition, the first calculation unit 11 can also set the load percentage of each heat exchange device during operation with the goal of ensuring that the shutdown, opening times and operation time of each heat exchange device are basically the same every year, so as to ensure that each heat exchange device The full utilization of the unit extends the overall service life of the unit.

Example 2

Embodiment 2 provides a heat exchange system. The heat exchange system may include the control device and heat exchange equipment described in Embodiment 1, wherein the control device controls the operation of the compressor of the heat exchange equipment.

FIG. 3 is a schematic diagram of the heat exchange system of this embodiment. As shown in FIG. 3, the heat exchange system 300 has a central controller 301, an independent controller 302, and a heat exchange device 303. Among them, the heat exchange equipment 303 has a compressor; each independent controller 302 directly controls the compressor of each heat exchange equipment 303; information exchange between the central controller 301 and the independent controller 302, the central controller 301 can be directed to the independent controller 302 sends a control command, and the independent controller 302 can control the operation of the compressor according to the control command. Therefore, the central controller 301 can indirectly control the compressor of each heat exchange device 303 via the independent controller 302.

In this embodiment, the central controller 301 and/or the independent controller 302 may be used to implement the functions of the control device 10 described in Embodiment 1.

In this embodiment, the independent controller 302 can record the real-time operating current, evaporating temperature, condensing temperature, evaporating pressure, condensing pressure and other operating parameters of the compressor motor, and transmit these parameters to the central controller 301, the central controller 301 Calculate and analyze the user's load changes based on the transmitted data, and send control signals to each independent controller 302 to control the operation of the compressor of each heat exchanger 303.

The working principle of the heat exchange system of FIG. 3 will be described below with reference to the drawings. In the following description, the central controller 301 may be, for example, a central monitoring computer, and the independent controller 302 may be, for example, a programmable logic controller (PLC).

The compressor operating state measurement and control device and the outdoor temperature and humidity measurement and control device collect data every five minutes (you can also output bar graphs or continuous curves based on other time intervals), and transfer the data to the PLC. The PLC calculates the transferred data After the analysis, it is recorded and the bar graph shown in Figure 4 is output every hour to show how the compressor load changes with time within an hour. The PLC can calculate the load on the user side at each time in the next hour based on the historical record of the user-side load at each time shown in FIG. 4, thereby pre-adjusting the compressor, and based on the collected real-time outdoor ambient temperature Compare with the ambient temperature at each moment of the previous hour and properly modify the load on the household side, and then make precise adjustments.

The central monitoring computer obtains the average load of the compressor in each hour according to the load situation of Figure 4 by weighted average method or integration to find the area and then average and other methods. The calculated average load of each hour is calculated as shown in the figure. The change in load on the user's side per hour during the day shown in 5. The PLC can calculate the change characteristics of the average value of the user-side load per hour in a day based on FIG. 5, for example, the PLC can predict the average value of the user-side load for the next hour based on the average value of the user-side load of the previous hour and advance Adjust the compressor.

According to the load situation of Figure 5, the PLC adopts the weighted average method or the integral to find the area and then average other methods to obtain the average load situation of the unit in each day, and the calculated average load of each day is calculated to obtain within one month as shown in Figure 6 Changes in user-side load.

Due to the different use of heat exchange equipment, the load on the user side will show a certain regularity within a certain period of time. For example, the school will show a large load on the user side from Monday to Friday, and a small load on Saturday and Sunday. The opposite is true for shopping malls, that is, the load is small from Monday to Friday, and the load is large on Saturday and Sunday. Therefore, after the heat exchange equipment is put into use in the first year, it can form a historical record of the user-side load. Therefore, the PLC can calculate the change of the later user-side load according to the historical record of the user-side load, so as to adjust in advance; in addition, When the heat exchange equipment is put into use in the second year, the PLC can predict the user-side load of each day of the year according to the load situation of the previous year; in addition, as the compressor running time is extended, the historical record uploaded by the PLC to the central monitoring computer is also More and more, the prediction of PLC will be more and more accurate.

According to the load situation in Figure 6, PLC adopts weighted average method or integral to find the area and then average other methods to obtain the total load situation of the compressor in each month, and the calculated monthly load statistics are obtained as shown in Figure 7. Monthly changes in user-side load throughout the year. In the next year's operation, the PLC can compare the load of each month with the load of the same month of the previous year. If the user-side load in the previous months has increased year-on-year every month, it means that the user-side load has increased. PLC The operation of the following months can be calculated based on the operation of the previous months. As shown in Figure 8, the load on the user side increases year by year in the first, second, and third years; for the same reason, if the compressor is in front The load on the user side remains the same compared to the previous year or decreases year-on-year, indicating that the load on the user side remains the same or decreases compared to the previous year.

In the heat exchange system shown in Figure 3, multiple heat exchange equipment can be operated in parallel on the user side. The historical operation records of each heat exchange equipment are transmitted to the central monitoring computer. The center monitors the historical operation of each heat exchange equipment in the computer It is foreseeable that the sum of the user-side loads at a predetermined time in the future, and the method of calculating the sum of the user-side loads is the same as the method of calculating the user-side loads of a single heat exchange system.

In the central monitoring computer, the COP of each heat exchange device under different loads (such as 100%, 75%, 50%, 25%, etc.) can be built in. The COP of each heat exchange device under different loads can be changed by the heat exchange The equipment manufacturer can obtain it through testing, and it can also be obtained through curve fitting. The central monitoring computer determines the best combination mode of joint operation of each heat exchange equipment based on the calculated total load of the user side and the comprehensive analysis of the performance-load curve of each heat exchange equipment, that is, the joint operation of each heat exchange equipment The best energy-saving mode includes: determining the start-up, load increase, load reduction and shutdown of each chiller. The central monitoring computer transmits the calculation and analysis results to the PLC, and then controls the operation of the compressors of each heat exchange device through the PLC.

For the method for the central monitoring computer to calculate the optimal energy-saving mode for the joint operation of each heat exchange device, reference may be made to the description of Embodiment 1.

According to this embodiment, the control device predicts the user-side load by referring to the history of the user-side load of the heat exchange equipment, and controls the operation of the compressor of the heat exchange equipment based on the predicted user-side load. Since the control device of this embodiment does not use the return water temperature of the chilled water as the basis for determining the load on the user side, it is avoided that the chilled water flows to the chilled water return port after heat exchange at the end of the heat exchange equipment. Lag, so the load on the user side can be calculated in time, and the operation of the compressor can be controlled in time, so that the cooling capacity of the heat exchange equipment matches the load on the user side, thereby improving the operating efficiency of the heat exchange system.

Example 3

Embodiment 3 provides a compressor operation control method for controlling the operation of a compressor of a heat exchange device.

FIG. 9 is a schematic diagram of the control method. As shown in FIG. 9, the method includes:

Step 901: Calculate the user-side load of the heat exchange device at a predetermined time or within a predetermined time period according to the historical record of the user-side load of the heat exchange device;

Step 902: Control the operation of the compressor of the heat exchange device according to the calculated user-side load.

In step 901 of this embodiment, the user-side load may also be calculated according to the environmental parameters corresponding to the historical records and the environmental parameters at the predetermined time or within the predetermined time period.

In step 901 of this embodiment, the user-side load of the heat exchange device at a predetermined time or within a predetermined time period is also calculated according to the change trend of the historical record.

In this embodiment, when the compressor of the heat exchange device is started: in step 901, it is calculated according to the detected start time, the environmental parameter detected at the start time, the historical record, and the environmental parameter corresponding to the historical record The user-side load of the heat exchange device at startup; in step 902, the user-side load of the heat exchange device is used as the upper limit of the load increase of the compressor at startup to control the operation of the compressor.

In this embodiment, when the user-side load of the heat exchange device calculated at step 901 at a predetermined time or within a predetermined time period is lower than the operating limit of the compressor, in step 902, the compressor is issued Command to stop the compressor.

In step 902 of this embodiment, when the user-side load of the compressor decreases to the lower operating limit of the compressor, the first control unit issues an instruction to stop the load without load reduction based on the historical load.

As shown in FIG. 9, the control method further includes:

Step 903: Collect user-side load information of the heat exchange device and perform analysis to generate the historical record.

FIG. 10 is another schematic diagram of the control method. The control method controls the operation of compressors of two or more heat exchange devices operating in parallel. As shown in FIG. 10, the method includes:

Step 1001: Calculate the heat exchange for each heat exchange device based on the historical record of the sum of the user-side loads of the two or more heat exchange devices and the change in the heating energy efficiency ratio (COP) of each heat exchange device with the load The load percentage when the equipment is running;

Step 1002: Control the operation of the compressor of each heat exchange device according to the calculated load percentage.

An embodiment of the present invention further provides a storage medium storing a computer-readable program, wherein the computer-readable program causes the control device or the heat exchange system to execute the control method described in Embodiment 1.

An embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in a control device or a heat exchange system, the program causes the control device or the heat exchange system to execute the control method of Embodiment 1.

The above device and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to such a computer-readable program which, when executed by a logic component, can enable the logic component to implement the above-mentioned device or constituent component, or enable the logic component to implement the various methods described above Or steps. The invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

The processing methods in each device described in conjunction with the embodiments of the present invention may be directly embodied as hardware, software modules executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in FIG. 1 and/or one or more combinations of the functional block diagrams may correspond to each software module of the computer program flow or each hardware module. These software modules may correspond to the steps shown in FIG. 9 and FIG. 10, respectively. These hardware modules can be realized by solidifying these software modules using, for example, a field programmable gate array (FPGA).

The software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in the ASIC. The software module can be stored in the memory of the mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or a large-capacity flash memory device.

One or more of the functional block diagrams described in FIG. 1 and/or one or more combinations of the functional block diagrams can be implemented as a general-purpose processor, a digital signal processor (DSP), or a dedicated processor for performing the functions described in this application An integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof. One or more of the functional block diagrams described in FIG. 1 and/or one or more combinations of the functional block diagrams can also be implemented as a combination of computing devices, for example, a combination of DSP and microprocessor, multiple microprocessors, One or more microprocessors combined with DSP communication or any other such configuration.

The present invention has been described above in conjunction with specific embodiments, but those skilled in the art should understand that these descriptions are exemplary and do not limit the protection scope of the present invention. Those skilled in the art can make various variations and modifications to the present invention based on the principles of the present invention, and these variations and modifications are also within the scope of the present invention.

Claims

A compressor operation control device is used to control the operation of a compressor of a heat exchange device. The control device includes:

A first calculation unit that calculates the user-side load of the heat exchange device at a predetermined time or within a predetermined time period based on the history of the user-side load of the heat exchange device; and

The first control unit controls the operation of the compressor of the heat exchange device based on the calculated user-side load.
The control device according to claim 1, wherein

The first calculation unit also calculates the user-side load according to the environmental parameters corresponding to the historical records and the environmental parameters at the predetermined time or within the predetermined time period,

And, the first control unit controls the operation of the compressor of the heat exchange device according to the calculated user-side load.
The control device according to claim 2, wherein:

When the compressor of the heat exchange device is started, the first calculation unit calculates according to the time of starting, the environmental parameter detected at the time of starting, the historical record, and the environmental parameter corresponding to the historical record. The user-side load of the heat exchange equipment at startup,

Furthermore, the first control unit controls the operation of the compressor using the user-side load of the heat exchange device as an upper limit of the load increase when the compressor is started.
The control device according to claim 2, wherein:

When the user-side load of the heat exchange device calculated by the first calculation unit at a predetermined time or within a predetermined period of time is lower than the lower operating limit of the compressor, the first control unit issues the compressor Stop command.
The control device according to claim 1 or 2, wherein

The first calculation unit also calculates the user-side load of the heat exchange device at a predetermined time or within a predetermined time period according to the change trend of the historical record.
The control device according to claim 1 or 2, wherein the control device further comprises:

An information analysis unit, which is used to collect user-side load information of the heat exchange equipment and analyze it to generate the historical record.
The control device according to claim 1 or 2, wherein

When the control device controls the operation of the compressors of two or more heat exchange equipment operating in parallel,

The first calculation unit calculates for each heat exchange device based on the historical record of the sum of user-side loads of the two or more heat exchange devices, and the relationship between the heating energy efficiency ratio (COP) of each heat exchange device and the load The load percentage of the heat exchange equipment during operation,

The first control unit controls the operation of the compressor of each heat exchange device according to the load percentage calculated by the first calculation unit.
A heat exchange system includes the control device according to any one of claims 1-7 and a heat exchange device, wherein the control device controls the operation of the compressor of the heat exchange device.
A compressor operation control method is used to control the operation of a compressor of a heat exchange device. The control method includes:

Calculating the user-side load of the heat exchange device at a predetermined time or within a predetermined time period based on the historical record of the user-side load of the heat exchange device; and

Based on the calculated user-side load, the operation of the compressor of the heat exchange device is controlled.
The control method according to claim 9, wherein

In the step of calculating the user-side load, the user-side load is also calculated according to the environmental parameters corresponding to the historical records and the environmental parameters at the predetermined time or within the predetermined time period.
The control method according to claim 10, wherein

When the compressor of the heat exchange device is started,

In the step of calculating the load on the user side, the user of the heat exchange device at startup is calculated based on the startup time, the environmental parameters detected at the startup time, the historical record, and the environmental parameters corresponding to the historical record Side load,

In addition, in the operation step of controlling the compressor of the heat exchange device, the operation of the compressor is controlled by using the user-side load of the heat exchange device as the upper limit of the load increase when the compressor is started.
The control method according to claim 10, wherein

When the calculated user-side load of the heat exchange device is lower than the lower operating limit of the compressor at a predetermined time or within a predetermined time period,

In the operation step of controlling the compressor of the heat exchange device, an instruction to stop the compressor is issued to the compressor.
The control method according to claim 9 or 10, wherein

In the step of calculating the user-side load, the user-side load of the heat exchange device at a predetermined time or within a predetermined time period is also calculated according to the change trend of the historical record.
The control method according to claim 9 or 10, wherein the control method further comprises:

Collect information on the user-side load of the heat exchange device and analyze it to generate the historical record.
A compressor operation control method, which controls the operation of compressors of two or more heat exchange equipment operating in parallel, the method comprising:

Based on the historical record of the sum of the user-side loads of more than two heat exchange equipment, and the relationship between the heating energy efficiency ratio (COP) of each heat exchange equipment and the load, calculate the load of the heat exchange equipment during operation of the heat exchange equipment percentage;

According to the calculated load percentage, the operation of the compressor of each heat exchange device is controlled.