CN120274468A - Double-compressor control system - Google Patents
Double-compressor control system Download PDFInfo
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- CN120274468A CN120274468A CN202510775426.2A CN202510775426A CN120274468A CN 120274468 A CN120274468 A CN 120274468A CN 202510775426 A CN202510775426 A CN 202510775426A CN 120274468 A CN120274468 A CN 120274468A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mathematical Physics (AREA)
- Fuzzy Systems (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control system of double compressors, which relates to the technical field of compressor control and comprises a starting control module, an operation monitoring and regulating module, an operation control module, a control module and a control module, wherein the starting control module is used for controlling the starting sequence and time interval of two compressors so as to reduce starting current impact, the operation monitoring and regulating module is used for monitoring the operation parameters of a double compressor system, suction pressure, exhaust pressure, oil temperature, rotating speed, refrigerant temperature and refrigerant flow of the system in real time, the reasonable starting control sequence and time interval are used for effectively reducing the current impact when the double compressors are started, protecting a motor and a power grid of the compressors, prolonging the service life of the compressors, improving the starting reliability of the system, regulating and controlling the operation state in time by adopting an accurate control algorithm according to actual working conditions, improving the operation efficiency of the system, reducing energy consumption, and guaranteeing the stability and reliability of refrigerating and heating effects of the system.
Description
Technical Field
The invention relates to the technical field of compressor control, in particular to a double-compressor control system.
Background
In refrigeration, heating and gas compression applications, the compressor is used as a core component, the performance and the operation stability of the compressor play a key role in the working effect of the whole system, along with the development of technology and the diversification of application requirements, a single compressor system gradually shows limitation when meeting complex working conditions and high-efficiency requirements, in order to overcome the defects of the single compressor system, a double compressor system is generated, and the double compressor system can flexibly adjust the operation mode under different working conditions by reasonably configuring two compressors, so that the overall performance and the energy efficiency of the system are improved, only one compressor can be operated when the load is low, the energy consumption is reduced, and the two compressors work simultaneously when the load is high, thereby meeting the requirements of the system on the refrigerating capacity or the heating capacity.
In the existing dual-compressor control system, on one hand, the starting control of the compressors is unreasonable, current impact is large in the starting process, the service life of the compressors is influenced, interference can be caused to a power grid, two compressors are started simultaneously, instantaneous current is too large, motor windings of the compressors are easy to damage, power grid voltage fluctuation can be caused, normal operation of other electrical equipment is influenced, on the other hand, in the operation process of the compressors, real-time monitoring and accurate regulation and control capability for working condition change are lacked, operation parameters of the compressors cannot be timely adjusted according to actual requirements, the operation efficiency of the system is low, when the environmental temperature or load changes, the compressors cannot be rapidly adjusted, the refrigerating or heating effect of the system is poor, power consumption is high, in addition, the prior art is insufficient in cooperative work control of the dual compressors, work coordination between the two compressors is not smooth enough, mutual interference is easy to occur, in the oil return control process, one compressor is possibly excessive in oil return, the other compressor is insufficient, the oil return effect is influenced, the enthalpy of the compressors cannot be controlled accurately, the enthalpy of the compressors cannot be controlled, and the best enthalpy of the compressors cannot be controlled.
In summary, the existing dual-compressor control system has a plurality of problems in the aspects of start control, operation regulation and cooperative work, and cannot meet the increasing application requirements of high efficiency, stability and energy conservation, so the invention provides a dual-compressor control system, which solves the problems in the aspects of start control, operation regulation and cooperative work of the dual-compressor control system in the prior art, realizes the high efficiency and stable control of the dual-compressor, and improves the overall performance of the system.
Disclosure of Invention
To achieve the above object, the present invention provides a dual compressor control system comprising:
the starting control module is used for controlling the starting sequence and time interval of the two compressors so as to reduce the starting current impact;
The operation monitoring and regulating module is used for monitoring operation parameters of the double-compressor system in real time, such as suction pressure, exhaust pressure, oil temperature, rotating speed, refrigerant temperature and refrigerant flow of the system;
the oil return balance control module is used for enabling the first compressor and the second compressor in the double-compressor system to be provided with corresponding oil separators;
The air supplementing and enthalpy increasing control module is used for opening the air supplementing electronic expansion valve, and the controller gradually increases the opening of the air supplementing electronic expansion valve according to a time sequence;
And the intelligent cooperative control module is used for coordinating the work of the two compressors, cooperatively operating, carrying out comprehensive analysis on various operation parameters under different refrigeration, heating and dehumidification modes and different load conditions, and reasonably distributing the work tasks of the two compressors.
In one example, the start control module receives a start instruction, controls the first compressor to start, the duration of the first compressor to start reaches a first preset duration, obtains the operating frequency of the first frequency converter, the operating frequency of the first frequency converter is greater than a first frequency threshold, the duration of the first compressor to start reaches a second preset duration, controls the second compressor to start, at the moment, the load and the current generated by the operation of the second compressor change steadily, starts the second compressor, avoids instant heavy current impact caused by the simultaneous start of the two compressors, and protects the compressor motor and the power grid.
In one example, the operation monitoring and controlling module monitors the operation parameters of the dual-compressor system in real time, controls the operation state of the compressors according to the real-time parameters by using a control algorithm, detects that the suction pressure is too low, and is insufficient, controls the frequency converter to reduce the rotation speed of the compressors, reduces the compression amount of the refrigerants, maintains the pressure balance of the system, avoids the occurrence of faults of the compressors due to the too low suction pressure, reduces the energy consumption, monitors the too high exhaust temperature, and increases the rotation speed of the cooling fan, adjusts the flow of the refrigerants to dissipate heat, reduces the operation power of the compressors, and ensures the exhaust temperature to be in a normal range.
In one example, one end of a first controllable valve of the oil return balance control module is connected to an oil discharging end of a first oil separator corresponding to the first compressor, the other end of the first controllable valve is connected to an air suction end of a second compressor, one end of the second controllable valve is connected to an oil discharging end of a second oil separator corresponding to the second compressor, the other end of the second controllable valve is connected to an air suction end of the first compressor, and when the first compressor and the second compressor are both operated, the current oil temperatures of the two compressors are obtained in real time.
In one example, the current oil temperatures of the first compressor and the second compressor are lower than the corresponding oil temperature thresholds, the current oil demand of the first compressor and the current oil demand of the second compressor are respectively determined based on the current oil temperature and the current operating frequency, the opening degrees of the first controllable valve and the second controllable valve are controlled according to the two oil demands, balanced distribution of the oil quantities of the compressors is achieved, the current oil demand of the first compressor is greater than the current oil demand of the second compressor, the opening degree of the first controllable valve is properly increased, more oil flows from the first oil separator to the air suction end of the second compressor, the opening degree of the second controllable valve is properly reduced, the oil quantity flowing to the air suction end of the first compressor is reduced, and oil return balance of the two compressors is ensured.
In one example, when the air-supplementing enthalpy-increasing control module opens the air-supplementing electronic expansion valve, the controller increases the opening of the air-supplementing electronic expansion valve according to time sequence, the two-stage compressor is opened and operates for a first preset time period, the controller controls the opening of the air-supplementing electronic expansion valve to be a first preset opening, the opening of the air-supplementing electronic expansion valve is a first preset opening, the controller operates for a second preset time period, the opening of the air-supplementing electronic expansion valve is increased to be a second preset opening, the opening of the air-supplementing electronic expansion valve is a second preset opening, the controller operates for a third preset time period, the air-supplementing electronic expansion valve is fully opened, the air-supplementing electronic expansion valve is opened, the detection device acquires the air-supplementing temperature and the air-supplementing pressure of the two-stage compressor, the saturation temperature corresponding to the air-supplementing pressure is acquired, the difference between the air-supplementing temperature and the saturation temperature is used as the air-supplementing superheat degree of the two-stage compressor, and the air-supplementing band liquid of the two-stage compressor is carried out by the two-stage compressor if the air-supplementing superheat degree is larger than the preset superheat degree.
In one example, the air-supplementing electronic expansion valve reduces a preset opening degree, the preset opening degree is an opening degree preset based on the full opening degree of the air-supplementing electronic expansion valve, the air-supplementing superheat degree and the preset superheat degree are the same, the air-supplementing superheat degree of the two-stage compressor is judged to be larger than the preset superheat degree twice, the operation of reducing the current opening degree of the air-supplementing electronic expansion valve and the operation of maintaining the current opening degree of the air-supplementing electronic expansion valve are respectively executed, and the operation of increasing the current opening degree of the air-supplementing electronic expansion valve is executed.
In one example, the intelligent cooperative control module is responsible for coordinating the operation of two compressors, a low-load refrigeration mode is adopted, one compressor with smaller power is started to operate, the load is gradually increased, one compressor cannot meet the requirement, the intelligent cooperative control module starts the other compressor according to the operation state of the current system, the air suction pressure, the air discharge pressure and the indoor and outdoor temperature parameters, and the operation frequency and the operation duration of the two compressors are adjusted to enable the two compressors to cooperatively operate.
In one example, in the heating mode, the cooperative operation of the two compressors is intelligently controlled according to the outdoor environment temperature, the indoor set temperature and the heating load factor of the system, and in the dehumidification mode, the operation of the two compressors is controlled according to the change of the indoor humidity and the temperature, and the refrigerant flow and the evaporation temperature are regulated.
The control system of the double compressors provided by the invention has the following beneficial effects:
1. The invention effectively reduces the current impact during the starting of the double compressors through reasonable starting control sequence and time interval, protects the motors and the power grid of the compressors, prolongs the service life of the compressors, improves the starting reliability of the system, and ensures that the compressors can timely adjust the running state according to the actual working condition, improve the running efficiency of the system, reduce the energy consumption and simultaneously ensure the stability and the reliability of the refrigerating and heating effects of the system through monitoring the running parameters of the system in real time and regulating and controlling by using an accurate control algorithm.
2. According to the invention, through a unique oil return balance control mechanism, oil return is accurately controlled according to the oil temperature and the operating frequency parameters of the compressors, oil return balance of the two compressors is ensured, the lubrication effect of the compressors is improved, the service life of the compressors is prolonged, the stability of system operation is enhanced, the phenomenon of air supplementing and liquid carrying of the compressors is effectively avoided by gradually opening the air supplementing electronic expansion valve and accurately regulating and controlling the air supplementing superheat degree, the stable operation of the compressors in the air supplementing and enthalpy increasing process is ensured, and the performance of the compressors and the energy efficiency of the system are improved.
3. According to the intelligent cooperative control system, the two compressors can efficiently and cooperatively operate according to different working conditions and load demands through the intelligent cooperative control module, so that the overall operation efficiency and stability of the system are improved, more comfortable and energy-saving use experience is provided for users, and diversified application demands are met.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a dual compressor control system according to the present invention.
Detailed Description
In order to more clearly and completely describe the technical scheme of the invention, the invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a dual compressor control system, comprising:
the starting control module is used for controlling the starting sequence and time interval of the two compressors so as to reduce the starting current impact;
The operation monitoring and regulating module is used for monitoring operation parameters of the double-compressor system in real time, such as suction pressure, exhaust pressure, oil temperature, rotating speed, refrigerant temperature and refrigerant flow of the system;
the oil return balance control module is used for enabling the first compressor and the second compressor in the double-compressor system to be provided with corresponding oil separators;
The air supplementing and enthalpy increasing control module is used for opening the air supplementing electronic expansion valve, and the controller gradually increases the opening of the air supplementing electronic expansion valve according to a time sequence;
And the intelligent cooperative control module is used for coordinating the work of the two compressors, cooperatively operating, carrying out comprehensive analysis on various operation parameters under different refrigeration, heating and dehumidification modes and different load conditions, and reasonably distributing the work tasks of the two compressors.
After receiving a start command, the start control module firstly controls the first compressor to start, after the start control module starts, the system starts timing, and when the start time of the first compressor reaches a first preset timeWhen the operation frequency of the first frequency converter is obtainedIf (if)Greater than a first frequency thresholdAnd the duration of the first compressor being turned on further reaches a second predetermined durationAt this time, the second compressor is controlled to be turned on.
The operation monitoring and regulating module monitors operation parameters of the double compressor system in real time, including suction pressureExhaust pressureOil temperatureRotational speedRefrigerant temperature of systemAnd the flow rate of the refrigerantAnd regulating and controlling the running state of the compressor by using a control algorithm according to the parameters monitored in real time.
When the system detects suction pressureWhen the pressure of the refrigerant is too low, judging that the refrigerant is insufficient, at the moment, controlling the frequency converter to reduce the rotating speed of the compressor, reducing the compression quantity of the refrigerant, maintaining the pressure balance of the system, and whenBelow a set inspiratory pressure thresholdWhen the frequency converter changes the rotation speed of the compressor fromIs reduced toThe compression amount of the refrigerant is reduced, faults caused by too low suction pressure of the compressor are avoided, and meanwhile, the energy consumption is reduced.
Monitoring exhaust gas temperatureToo high, which means that the load of the compressor is too high, the system can increase the rotating speed of the cooling fan, adjust the flow of the refrigerant to dissipate heat, reduce the running power of the compressor, ensure the exhaust temperature to be in a normal range,Above a set exhaust temperature thresholdAt the time, the rotation speed of the cooling fan is controlled fromTo be increased toAnd simultaneously, the flow of the refrigerant is regulated, so that the exhaust temperature is reduced to be within a normal range.
In the oil return balance control module, one end of a first controllable valve is connected with an oil discharge end of a first oil separator corresponding to a first compressor, the other end of the first controllable valve is connected with an air suction end of a second compressor, one end of the second controllable valve is connected with an oil discharge end of a second oil separator corresponding to the second compressor, and the other end of the second controllable valve is connected with the air suction end of the first compressor.
When the first compressor and the second compressor are both operated, the current oil temperatures of the two compressors are obtained in real timeAndWhen (when)AndAre all lower than the corresponding oil temperature threshold valueBased on the current oil temperature and the current operating frequency、Determining a current oil demand of the first compressorAnd the current oil demand of the second compressor。
According toAndControlling the opening degree of the first controllable valve and the second controllable valve ifThe system properly increases the opening degree of the first controllable valve, so that more oil flows from the first oil separator to the air suction end of the second compressor, and simultaneously properly reduces the opening degree of the second controllable valve, reduces the oil quantity flowing to the air suction end of the first compressor, and ensures the balance of oil return of the two compressors.
When the air supplementing and enthalpy increasing control module opens the air supplementing electronic expansion valve, the controller increases the opening of the air supplementing electronic expansion valve according to the time sequence, and the two-stage compressor is opened and operated for a first preset time periodThen, the controller controls the opening of the air supplementing electronic expansion valve to be a first preset openingWhen the air supplementing electronic expansion valve is openedOperating for a second preset period of timeAfter that, the opening degree is increased to a second preset opening degreeAnd then run for a third preset period of timeAnd then, the air supplementing electronic expansion valve is fully opened.
After the air supplementing electronic expansion valve is opened, the detection device collects the air supplementing temperature of the two-stage compressorAnd air pressureAcquiring the pressure of the air supplyCorresponding saturation temperatureThe temperature of the air is compensatedAnd saturation temperatureIs taken as the difference value of the two-stage compressor to supplement the air and overheat。
If it isIs greater than a preset superheat degreeJudging that the air supplementing liquid is carried by the two-stage compressor, and at the moment, the air supplementing electronic expansion valve reduces the preset opening degreeThe preset opening degreeIs based on the preset opening of the full opening of the air-supplementing electronic expansion valve, if the superheat degree of the air-supplementing is judged twiceIs greater than a preset superheat degreeThe operations of decreasing the current opening degree of the air-make-up electronic expansion valve and maintaining the current opening degree of the air-make-up electronic expansion valve are performed, respectively, and then the operations of increasing the current opening degree of the air-make-up electronic expansion valve are performed.
The intelligent cooperative control module is responsible for coordinating the work of the two compressors, starts a compressor with smaller power to operate in a low-load refrigeration mode, gradually increases with load, and when the compressor cannot meet the requirement, the intelligent cooperative control module controls the compressor to operate according to the current system operation state, including the suction pressureExhaust pressureIndoor and outdoor temperature parameters、And starting the other compressor, and adjusting the operation frequency and the operation time of the two compressors to enable the two compressors to work cooperatively.
According to the outdoor environment temperature under heating modeIndoor set temperatureAnd the heating load factor of the system, the cooperative operation of the two compressors is intelligently controlled, and when the outdoor environment temperature is lower, the operation power of the two compressors is properly increased so as to meet the indoor heating requirement.
In the dehumidification mode, according to the indoor humidityAnd temperatureThe operation of the two compressors is controlled, the refrigerant flow and the evaporation temperature are regulated, when the indoor humidity is higher, the operation power of the compressors is increased, the refrigerant flow is increased, the evaporation temperature is reduced, and the dehumidification effect is improved.
In the air conditioning system of the hotel, a compressor with smaller power is started firstly in a low-load refrigeration mode, when indoor personnel are increased and the load is increased, when the decrease of suction pressure and the increase of indoor temperature are detected, the other compressor is started, the running frequency and the working time of the two compressors are adjusted according to real-time parameters, and in the heating mode, if the outdoor temperature isThe indoor set temperature isThe system can increase the operation power of the two compressors to ensure that the indoor temperature reaches the set value, and in the dehumidification mode, when the indoor humidity reaches the set valueWhen the air conditioner is in operation, the running power of the compressor is increased, the flow rate and the evaporation temperature of the refrigerant are regulated, and the indoor humidity is reduced.
In the dual-compressor control system in this embodiment, after the system receives a start signal, the start control module firstly controls the first compressor to start, the first preset time length is set, after the first compressor is started for 5 seconds, the system obtains the running frequency of the first frequency converter, the first frequency threshold value is set to 30Hz, when the running frequency of the first frequency converter is greater than 30Hz, and the first compressor start time length reaches the second preset time length for 10 seconds, the start control module controls the second compressor to start, in actual running, through the start control mode, current impact caused by simultaneous start of the two compressors is successfully avoided, current steadily rises in the start process, abnormal fluctuation does not occur, a compressor motor and a power grid are effectively protected, meanwhile, the start time is shortened, and the response speed of the system is improved.
In an industrial refrigeration system, an operation monitoring and regulating module monitors operation parameters of a compressor in real time, when the system detects that the suction pressure is 0.2MPa and is lower than the normal range by 0.3-0.5MPa, the operation monitoring and regulating module controls a frequency converter to reduce the rotation speed of the compressor from 50Hz to 30Hz according to a preset algorithm, after a period of operation, the suction pressure gradually rises to 0.35MPa and is stabilized in the normal range, meanwhile, the system detects that the exhaust temperature reaches 100 ℃, the temperature is higher than the normal range by 80-95 ℃, the operation monitoring and regulating module immediately controls the rotation speed of a cooling fan to be increased from 1000 rpm to 1500 rpm, and regulates the flow of a refrigerant to gradually reduce the exhaust temperature to 90 ℃ within 10 minutes so as to recover to the normal level, and through such real-time monitoring and accurate regulation, the system can keep stable operation under different working conditions, has good refrigeration effect and energy consumption is effectively controlled.
In the double-compressor heat pump system, an oil return balance control module plays a role, in the operation process of the first compressor and the second compressor, real-time oil temperature monitoring shows that the current oil temperature of the first compressor is 50 ℃, the current oil temperature of the second compressor is 48 ℃, the oil temperature is not higher than an oil temperature threshold value of 60 ℃, at this time, the system calculates the current oil demand of the first compressor to be 0.8L/min according to the operation frequency of the compressors and the current oil temperature, the current oil demand of the second compressor to be 0.6L/min, the oil return balance control module controls the opening of the first controllable valve to be 60% according to the two oil demands, the opening of the second controllable valve to be 40% after a period of operation, the oil temperature and the oil level of the two compressors are detected again, the oil temperature is found to be stable within a reasonable range, the oil levels of the two compressors are basically consistent, the oil return balance control effect is good, and the lubrication and stable operation of the compressors are effectively ensured.
In a two-stage compression refrigeration system, when the air-supplementing enthalpy-increasing function is required to be started, a first preset time period is set to 3 minutes, after the two-stage compressor is started to operate for 3 minutes, the controller adjusts the opening of the air-supplementing electronic expansion valve to be the first preset opening and 20% of full opening, after the two-stage compressor is operated for 2 minutes in a second preset time period under the opening, the opening of the air-supplementing electronic expansion valve is increased to be the second preset opening and 50% of full opening, after the three-stage compressor is operated for 2 minutes in a third preset time period, the air-supplementing electronic expansion valve is fully opened, in the air supplementing process, the air-supplementing temperature is acquired by a detection device, the air-supplementing pressure is 0.6MPa, and after calculation, the saturated temperature corresponding to the air-supplementing pressure is 25 ℃, the air-supplementing superheat degree is 5 ℃ and is not more than 6 ℃ of preset superheat degree, at the moment, the current opening of the air-supplementing electronic expansion valve is kept unchanged, in the subsequent operation, the system continuously monitors the air-supplementing superheat degree, when the air-supplementing superheat degree occasionally exceeds the preset superheat degree, the air-supplementing superheat degree is adjusted in the air-supplementing electronic expansion valve, the air-supplementing efficiency is ensured, and the refrigerating efficiency is stable in the air-supplementing process.
The intelligent cooperative control module reasonably controls the cooperative operation of the two compressors according to different working conditions and load demands, the indoor load is larger during the daytime refrigerating peak period in summer, the intelligent cooperative control module simultaneously starts the two compressors, and adjusts the operation frequency of the two compressors according to the indoor temperature, the humidity and the outdoor environment temperature parameter to enable the two compressors to cooperatively work, so that the refrigerating demands are met, when the intelligent cooperative control module enters night, the indoor load is reduced, the intelligent cooperative control module closes one compressor according to the parameter monitored in real time, only enables the other compressor to operate at a lower frequency to maintain the indoor comfortable environment, and in a winter heating mode, the intelligent cooperative control module accurately controls the cooperative operation of the two compressors according to the change of the outdoor temperature and the indoor set temperature, so that the energy consumption is reduced to the greatest extent while the heating effect is ensured, and the operation efficiency of the commercial air conditioning system is obviously improved through intelligent cooperative control, the energy consumption is reduced by about 20%, a great amount of energy cost is saved for users, and meanwhile, the comfort of the indoor environment is improved.
Of course, the present invention can be implemented in various other embodiments, and based on this embodiment, those skilled in the art can obtain other embodiments without any inventive effort, which fall within the scope of the present invention.
Claims (9)
1. A dual compressor control system, comprising:
the starting control module is used for controlling the starting sequence and time interval of the two compressors so as to reduce the starting current impact;
The operation monitoring and regulating module is used for monitoring operation parameters of the double-compressor system in real time, such as suction pressure, exhaust pressure, oil temperature, rotating speed, refrigerant temperature and refrigerant flow of the system;
the oil return balance control module is used for enabling the first compressor and the second compressor in the double-compressor system to be provided with corresponding oil separators;
The air supplementing and enthalpy increasing control module is used for opening the air supplementing electronic expansion valve, and the controller gradually increases the opening of the air supplementing electronic expansion valve according to a time sequence;
And the intelligent cooperative control module is used for coordinating the work of the two compressors, cooperatively operating, carrying out comprehensive analysis on various operation parameters under different refrigeration, heating and dehumidification modes and different load conditions, and reasonably distributing the work tasks of the two compressors.
2. The dual compressor control system of claim 1, wherein the start control module receives a start command to control the first compressor to start, the duration of the first compressor to start reaches a first predetermined duration, the operating frequency of the first frequency converter is obtained, the operating frequency of the first frequency converter is greater than a first frequency threshold, the duration of the first compressor to start reaches a second predetermined duration, the second compressor is controlled to start, at this time, the load and the current changes generated by the operation of the second compressor are stable, the second compressor is started, transient high current impact caused by the simultaneous start of the two compressors is avoided, and the compressor motor and the power grid are protected.
3. The control system of claim 1, wherein the operation monitoring and control module monitors the operation parameters of the dual-compressor system in real time, controls the operation state of the compressors according to the real-time parameters by using a control algorithm, and the system detects that the suction pressure is too low, is insufficient in refrigerant, controls the frequency converter to reduce the rotation speed of the compressors, reduces the compression amount of the refrigerant, maintains the pressure balance of the system, avoids the occurrence of faults of the compressors due to the too low suction pressure, reduces the energy consumption, monitors the too high exhaust temperature, and the too high load of the compressors, increases the rotation speed of the cooling fan, adjusts the flow of the refrigerant to dissipate heat, reduces the operation power of the compressors, and ensures the exhaust temperature to be in a normal range.
4. The control system of claim 1, wherein one end of the first controllable valve of the oil return balance control module is connected to the oil discharging end of the first oil separator corresponding to the first compressor, the other end of the first controllable valve is connected to the air suction end of the second compressor, one end of the second controllable valve is connected to the oil discharging end of the second oil separator corresponding to the second compressor, the other end of the second controllable valve is connected to the air suction end of the first compressor, and the current oil temperatures of the two compressors are obtained in real time when the first compressor and the second compressor are both operated.
5. The control system of two compressors according to claim 4, wherein the current oil temperatures of the first and second compressors are lower than the respective oil temperature thresholds, the current oil demand of the first compressor and the current oil demand of the second compressor are determined based on the current oil temperature and the current operating frequency, respectively, the opening of the first controllable valve and the opening of the second controllable valve are controlled according to the two oil demands, balanced distribution of the compressor oil is achieved, the current oil demand of the first compressor is greater than the current oil demand of the second compressor, the system properly increases the opening of the first controllable valve, more oil flows from the first oil separator to the suction end of the second compressor, simultaneously properly decreases the opening of the second controllable valve, decreases the oil quantity flowing to the suction end of the first compressor, and ensures balanced return oil for the two compressors.
6. The control system of two compressors according to claim 1, wherein the control module increases the opening of the electronic expansion valve in time sequence, the two-stage compressor is opened and operated for a first preset time period, the controller controls the opening of the electronic expansion valve to be the first preset opening, the opening of the electronic expansion valve is the first preset opening, the second preset time period is operated, the opening of the electronic expansion valve is increased to the second preset opening, the opening of the electronic expansion valve is the second preset opening, the third preset time period is operated, the electronic expansion valve is fully opened, the electronic expansion valve is opened, the detection device acquires the air supply temperature and the air supply pressure of the two-stage compressor, the saturation temperature corresponding to the air supply pressure is acquired, the difference between the air supply temperature and the saturation temperature is used as the air supply superheat degree of the two-stage compressor, and the air supply superheat degree of the two-stage compressor is larger than the preset superheat degree based on the air supply superheat degree.
7. The control system according to claim 6, wherein the air-make-up electronic expansion valve reduces a preset opening degree, the preset opening degree is an opening degree preset based on a full opening degree of the air-make-up electronic expansion valve, the air-make-up superheat degree and the preset superheat degree, the air-make-up of the two-stage compressor is free of liquid, the air-make-up superheat degree is judged to be larger than the preset superheat degree twice, the operations of reducing the current opening degree of the air-make-up electronic expansion valve and maintaining the current opening degree of the air-make-up electronic expansion valve are performed, respectively, and the operation of increasing the current opening degree of the air-make-up electronic expansion valve is performed.
8. The control system of two compressors according to claim 1, wherein the intelligent cooperative control module is responsible for coordinating the operation of the two compressors, a low-load refrigeration mode is adopted, one compressor with smaller power is started to operate, the load is gradually increased, one compressor cannot meet the requirement, and the intelligent cooperative control module starts the other compressor according to the operation state of the current system, the suction pressure, the exhaust pressure and the indoor and outdoor temperature parameters, and adjusts the operation frequency and the operation duration of the two compressors to enable the two compressors to cooperatively operate.
9. The control system of claim 8, wherein the two compressors are controlled in a coordinated operation manner according to an outdoor ambient temperature, an indoor set temperature and a heating load factor of the system in the heating mode, and the two compressors are controlled to operate according to changes of indoor humidity and temperature in the dehumidifying mode, so as to adjust a refrigerant flow rate and an evaporation temperature.
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