A method for optimizing and controlling ice machine system based on system load energy consumption

Abstract

The present invention relates to an optimization and control method for an ice machine system based on system load energy consumption, and belongs to the field of ice machine system control technology. The method includes: obtaining the ice machine system load, cooling water return temperature, chilled water supply temperature, and the available number of variable frequency machines and fixed frequency machines in the medium temperature system; performing control optimization according to the refrigeration capacity consumed by the terminal equipment in the refrigeration system, and the control optimization is performed by judging the refrigeration capacity and the calculated amount of the total refrigeration tons of the ice machine after the optimization coefficient is processed as the initial execution process after the control system is started. If the refrigeration capacity is greater than the calculated amount, the system is controlled according to the available number of the variable frequency machines and fixed frequency machines; load balancing processing is performed according to the total operating power of the ice machine system after system control, and the required number of ice machines in the medium temperature system is output according to the result of the load balancing processing. Effectively utilize system resources and reduce energy consumption during peak hours.

Description

Technical Field

[0001] The invention belongs to the technical field of ice machine system control, and in particular relates to an ice machine system optimization control method based on system load energy consumption. Background Art

[0002] The ice machine system is in partial load operation most of the time, and the energy efficiency at this time is usually lower than that at full load operation. Therefore, it is necessary to enhance the energy regulation capability of the unit and improve the energy efficiency under partial load; the traditional ice machine system relies on manual control, which is difficult to achieve timely response and optimal energy consumption. Since the actual efficiency curves of ice machines are different, it is difficult to accurately control the operating state of the ice machine by manual adjustment, resulting in energy consumption that cannot be optimized; the high cooling water temperature, low water pump efficiency, and unreasonable cooling water flow during the use of traditional ice machines will all cause energy consumption to increase; traditional control methods such as fixed scheduling and storage priority are not enough to dynamically adjust the ice machine system to respond to real-time changes in building loads. This leads to low system operation efficiency and the inability to fully utilize the ice storage device to achieve economic energy-saving benefits; in the actual operation of the multi-split unit, the compressor frequency modulation is poor due to low ambient temperature or partial load. In addition, the heat pump system also has problems in high-speed operation under extreme conditions or frequent start-stop losses under partial load conditions, improving the performance of individual components, and improving the overall control strategy. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a method for optimizing and controlling an ice machine system based on system load energy consumption.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for optimizing and controlling an ice machine system based on system load energy consumption, comprising:

[0006] Obtain the ice machine system load, cooling water return temperature, chilled water supply temperature, and the number of available variable frequency machines and fixed frequency machines in the medium temperature system;

[0007] Control optimization is performed according to the refrigeration capacity consumed by the terminal equipment in the refrigeration system. The control optimization is performed by judging the refrigeration capacity and the calculated total refrigeration tons of the operating refrigeration machine after the optimization coefficient is processed as the initial execution process after the control system is started. If the refrigeration capacity is greater than the calculated amount, the system is controlled according to the available number of the variable frequency machine and the fixed frequency machine;

[0008] A load balancing process is performed according to the total operating power of the ice machine system after the system is regulated, and the required number of ice machines for the medium temperature system is output according to the result of the load balancing process.

[0009] Specifically, the system control includes variable frequency control, fixed variable frequency control and fixed frequency control; the variable frequency control is judged according to the available number of variable frequency machines. If the available number of variable frequency machines is greater than 0, the variable frequency machines are incrementally controlled; if the available number of variable frequency machines is 0, the fixed variable frequency control and fixed frequency control are performed according to the available number and the running number of fixed frequency machines; the fixed variable frequency control is: if the running number of the fixed frequency machines is 0 and the available number is greater than 0, the fixed frequency machines and variable frequency machines are incrementally controlled; the fixed frequency control is: if the running number of the fixed frequency machines is greater than 0 and the available number is greater than 0, the fixed frequency machines are incrementally controlled.

[0010] Specifically, the incremental control of the variable frequency regulation is to add a variable frequency machine and reduce a variable frequency machine. The total operating power calculation formula of the ice machine system under the variable frequency regulation is:

[0011] ,

[0012] in, is the total operating power of the ice machine system under frequency conversion control, N is the number of inverters in operation, PVF Ln,te,tc The load rate is Ln , the chilled water temperature is you , cooling water temperature is tc The power consumption of the inverter unit under the following conditions;

[0013] The calculation formula for the total power of the incremental control of the variable frequency regulation is:

[0014] ,

[0015] ,

[0016] in, To increase the total power of a frequency converter system, To reduce the total power of a frequency converter system.

[0017] Specifically, the incremental control of the fixed-frequency variable frequency regulation is to add a fixed-frequency machine and reduce a variable frequency machine. The total operating power calculation formula of the ice machine system under the fixed-frequency variable frequency regulation is:

[0018] ,

[0019] in, is the total operating power of the ice machine system under constant frequency conversion control, PVF Ln,te,tc The load rate is Ln , the chilled water temperature is you , cooling water temperature is tc The power consumption of the inverter unit under the following conditions;

[0020] The calculation formula for the total power of the incremental control of the fixed frequency variable control is:

[0021] ,

[0022] ,

[0023] in, To reduce the total power of a frequency converter system, To increase the total power of a fixed frequency machine system, PVF is the power consumption of the inverter unit, PSF is the power consumption of a fixed frequency machine. Q is the current end load, Lm is the maximum efficiency load rate of the fixed frequency machine, RSF is the cooling capacity of the fixed frequency machine, RVF It is the cooling capacity of the inverter.

[0024] Specifically, the incremental control of the fixed frequency regulation is to add one fixed frequency machine and reduce one fixed frequency machine. The calculation formula for the total operating power of the ice machine system under the fixed frequency regulation is:

[0025] ,

[0026] in, is the total operating power of the ice machine system under fixed frequency control, M is the number of fixed frequency machines in operation;

[0027] The calculation formula for the total power of the incremental control of the fixed frequency regulation is:

[0028] ,

[0029] ,

[0030] in, To increase the total power of a fixed frequency machine system, To reduce the total power of a fixed frequency machine system.

[0031] Specifically, the load balancing process performs output constraints according to the total power after incremental control of the system regulation and the difference between the current operating total power and the instrument power of the refrigeration system, and outputs the corresponding number of variable-frequency machines and fixed-frequency machines that meet the output constraint conditions as the required number of ice machines for the medium-temperature system, and re-regulates the system if the output constraint conditions are not met.

[0032] The beneficial effects of the present invention are:

[0033] Taking the operation status of the variable frequency machine and the fixed frequency machine as the starting point, the number of variable frequency machines and fixed frequency machines in operation is dynamically adjusted according to the system end load and the rated total refrigeration tons of the operating ice machine, and the operation status of the motor is adjusted according to actual needs, which reduces the frequent start and stop of the equipment under high or low load conditions, thereby extending the service life of the equipment and reducing maintenance costs. It can better play the "peak shifting and valley filling" advantage of the ice storage air conditioning system, which is conducive to reducing the operating costs of the system. By monitoring the changes in load and making corresponding adjustments, system resources can be used more effectively and energy consumption during peak hours can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0035] Figure 1 The present invention is a flow chart of a method for optimizing and controlling an ice machine system based on system load energy consumption. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0037] See also Figure 1 , a method for optimizing and controlling an ice machine system based on system load energy consumption, comprising:

[0038] Obtain the ice machine system load, cooling water return temperature, chilled water supply temperature, and the number of available variable frequency machines and fixed frequency machines in the medium temperature system;

[0039] Control optimization is performed according to the refrigeration capacity consumed by the terminal equipment in the refrigeration system. The control optimization is performed by judging the refrigeration capacity and the calculated total refrigeration tons of the operating refrigeration machine after the optimization coefficient is processed as the initial execution process after the control system is started. If the refrigeration capacity is greater than the calculated amount, the system is controlled according to the available number of the variable frequency machine and the fixed frequency machine;

[0040] A load balancing process is performed according to the total operating power of the ice machine system after the system is regulated, and the required number of ice machines for the medium temperature system is output according to the result of the load balancing process.

[0041] Specifically, the system control includes variable frequency control, fixed variable frequency control and fixed frequency control; the variable frequency control is judged according to the available number of variable frequency machines. If the available number of variable frequency machines is greater than 0, the variable frequency machines are incrementally controlled; if the available number of variable frequency machines is 0, the fixed variable frequency control and fixed frequency control are performed according to the available number and the running number of fixed frequency machines; the fixed variable frequency control is: if the running number of the fixed frequency machines is 0 and the available number is greater than 0, the fixed frequency machines and variable frequency machines are incrementally controlled; the fixed frequency control is: if the running number of the fixed frequency machines is greater than 0 and the available number is greater than 0, the fixed frequency machines are incrementally controlled.

[0042] Specifically, the incremental control of the variable frequency regulation is to add a variable frequency machine and reduce a variable frequency machine. The total operating power calculation formula of the ice machine system under the variable frequency regulation is:

[0043] ,

[0044] in, is the total operating power of the ice machine system under frequency conversion control, N is the number of inverters in operation, PVF Ln,te,tc The load rate is Ln , the chilled water temperature is you , cooling water temperature is tc The power consumption of the inverter unit under the following conditions;

[0045] The calculation formula for the total power of the incremental control of the variable frequency regulation is:

[0046] ,

[0047] ,

[0048] in, To increase the total power of a frequency converter system, To reduce the total power of a frequency converter system.

[0049] Specifically, the incremental control of the fixed-frequency variable frequency regulation is to add a fixed-frequency machine and reduce a variable frequency machine. The total operating power calculation formula of the ice machine system under the fixed-frequency variable frequency regulation is:

[0050] ,

[0051] in, is the total operating power of the ice machine system under constant frequency conversion control, PVF Ln,te,tc The load rate is Ln , the chilled water temperature is you , cooling water temperature is tc The power consumption of the inverter unit under the following conditions;

[0052] The calculation formula for the total power of the incremental control of the fixed frequency variable control is:

[0053] ,

[0054] ,

[0055] in, To reduce the total power of a frequency converter system, To increase the total power of a fixed frequency machine system, PVF is the power consumption of the inverter unit, PSF is the power consumption of a fixed frequency machine. Q is the current end load, Lm is the maximum efficiency load rate of the fixed frequency machine, RSF is the cooling capacity of the fixed frequency machine, RVF It is the cooling capacity of the inverter.

[0056] Specifically, the incremental control of the fixed frequency regulation is to add one fixed frequency machine and reduce one fixed frequency machine. The calculation formula for the total operating power of the ice machine system under the fixed frequency regulation is:

[0057] ,

[0058] in, is the total operating power of the ice machine system under fixed frequency control, M is the number of fixed frequency machines in operation;

[0059] The calculation formula for the total power of the incremental control of the fixed frequency regulation is:

[0060] ,

[0061] ,

[0062] in, To increase the total power of a fixed frequency machine system, To reduce the total power of a fixed frequency machine system.

[0063] Specifically, the load balancing process performs output constraints according to the total power after incremental control of the system regulation and the difference between the current operating total power and the instrument power of the refrigeration system, and outputs the corresponding number of variable-frequency machines and fixed-frequency machines that meet the output constraint conditions as the required number of ice machines for the medium-temperature system, and re-regulates the system if the output constraint conditions are not met.

[0064] In this embodiment, the output constraint condition is to compare the total power after incremental control under each control mode with the difference between the current operating total power and the instrument power of the refrigeration system, which is specifically expressed as follows:

[0065] Frequency control: bool( < -DP| < -DP);

[0066] Fixed frequency control: bool( < -DP| < -DP);

[0067] Fixed frequency control: bool( < -DP| < -DP); when the bool value is 1, the corresponding number of variable frequency machines and fixed frequency machines will be output as the required number of ice machines for the medium temperature system; when the bool value is 0, the system will be re-regulated.

[0068] The computer storage medium of the embodiment of the present invention may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device.

[0069] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0070] The program code included on the computer readable medium can be transmitted with any appropriate medium, including but not limited to wireless, electric wire, optical cable, RF, etc., or any suitable combination of the above. The computer program code for performing the operation of the present invention can be written in one or more programming languages ​​or their combinations, and the programming language includes object-oriented programming languages-such as Java, Smalltalk, C++, and also includes conventional procedural programming languages-such as "C" language or similar programming languages. The program code can be executed completely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on the remote computer, or completely on the remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0071] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for optimizing and controlling an ice machine system based on system load energy consumption, characterized in that: include: Obtain the ice machine system load, cooling water return temperature, chilled water supply temperature, and the number of available variable frequency machines and fixed frequency machines in the medium temperature system; Control optimization is performed according to the refrigeration capacity consumed by the terminal equipment in the refrigeration system. The control optimization is performed by judging the refrigeration capacity and the calculated total refrigeration tons of the operating refrigeration machine after the optimization coefficient is processed as the initial execution process after the control system is started. If the refrigeration capacity is greater than the calculated amount, the system is controlled according to the available number of the variable frequency machine and the fixed frequency machine; The system control includes variable frequency control, fixed variable frequency control and fixed frequency control; the variable frequency control is determined according to the available number of variable frequency machines. If the available number of variable frequency machines is greater than 0, the variable frequency machines are incrementally controlled; if the available number of variable frequency machines is 0, the fixed variable frequency control and fixed frequency control are performed according to the available number and the number of running fixed frequency machines; The fixed-frequency and variable-frequency control is: if the number of running units of the fixed-frequency machine is 0 and the number of available units is greater than 0, the fixed-frequency machine and the variable-frequency machine are incrementally controlled; The fixed frequency control is: if the number of running units of the fixed frequency machine is greater than 0 and the number of available units is greater than 0, the fixed frequency machine is incrementally controlled; The incremental control of the frequency conversion regulation is to add a frequency converter and reduce a frequency converter. The total power calculation formula of the ice machine system under the frequency conversion regulation is: ， in, is the total operating power of the ice machine system under frequency conversion control, N is the number of inverters in operation, PVF Ln,te,tc The load rate is Ln , the chilled water temperature is te , cooling water temperature is tc The power consumption of the inverter unit under the following conditions; The calculation formula for the total power of the incremental control of the variable frequency regulation is: ， ， in, To increase the total power of a frequency converter system, To reduce the total power of a frequency converter system; The incremental control of the fixed-frequency variable frequency regulation is to add a fixed-frequency machine and reduce a variable frequency machine. The total power calculation formula of the ice machine system under the fixed-frequency variable frequency regulation is: , in, is the total operating power of the ice machine system under constant frequency conversion control, PVF Ln,te,tc The load rate is Ln , the chilled water temperature is te , cooling water temperature is tc The power consumption of the inverter unit under the following conditions; The calculation formula for the total power of the incremental control of the fixed frequency variable control is: ， ， in, To reduce the total power of a frequency converter system, To increase the total power of a fixed frequency machine system, PVF is the power consumption of the inverter unit, PSF is the power consumption of a fixed frequency machine. Q is the current end load, Lm is the maximum efficiency load rate of the fixed frequency machine, RSF is the cooling capacity of the fixed frequency machine, RVF The cooling capacity of the inverter; The incremental control of the fixed frequency regulation is to add one fixed frequency machine and reduce one fixed frequency machine. The total power calculation formula of the ice machine system under the fixed frequency regulation is: ， in, is the total operating power of the ice machine system under fixed frequency control, M The number of fixed frequency machines in operation; The calculation formula for the total power of the incremental control of the fixed frequency regulation is: ， ， in, To increase the total power of a fixed frequency machine system, To reduce the total power of a fixed frequency machine system; A load balancing process is performed according to the total operating power of the ice machine system after the system is regulated, and the required number of ice machines for the medium temperature system is output according to the result of the load balancing process.

2. The method according to claim 1, characterized in that The load balancing process performs output constraints based on the total power after incremental control of the system regulation and the difference between the current operating total power and the instrument power of the refrigeration system, and outputs the corresponding number of variable-frequency machines and fixed-frequency machines that meet the output constraint conditions as the required number of ice machines for the medium-temperature system, and re-regulates the system if the output constraint conditions are not met.

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