384 results about "Inverter compressor" patented technology

The invention provides a permanent magnet synchronous motor and an inverter compressor, and relates to the technical field of compressor design and manufacturing, the permanent magnet synchronous motor comprises a stator core and a rotor core arranged in the stator core; the stator core comprises stator teeth which are uniformly distributed in the circumferential direction, a stator yoke is arranged between every two adjacent stator teeth, every two adjacent stator teeth and the stator yoke between every two stator teeth form a stator groove, and a winding is embedded in each stator groove; a plurality of uniformly distributed eccentric arcs and linear segments are arranged on the periphery of the outer edge of the rotor core in the circumferential direction, uniformly distributed magnetic steel jacks are formed in the rotor core, and a groove is formed between every two adjacent magnetic steel jacks; and permanent magnets with alternating NS poles are arranged in the magnetic steel jacks. The inner diameter Rsi of the stator iron core, the maximum outer diameter Rro of the rotor iron core and the axial length Les of the stator iron core are limited to meet the condition that Les / (Rsi + Rro) is larger than or equal to 0.455 and smaller than or equal to 1.264, the torque density of the synchronous motor can be increased, and cost is reduced.

The invention belongs to the technical field of motor control, and discloses a control method of a motor for an inverter compressor, which comprises the following steps: embedding a distributed thermocouple array in a motor stator slot to acquire temperature data of the motor, synchronously acquiring operation parameters of the motor, generating a dynamic thermal field characteristic spectrum through a data fusion algorithm, coordinates of the hot spot areas with the temperature abnormally increased are marked, a dynamic correlation model is established, and heat conduction characteristic parameters in the dynamic correlation model are updated through a sliding window algorithm; outputting a predicted temperature rise curve through the dynamic correlation model, adjusting a PWM control strategy of the inverter, inputting the PWM control strategy to a motor driving unit to execute preliminary regulation and control, collecting feedback data to generate a multi-dimensional feedback feature vector, iteratively optimizing a combined weight of a switch interval compensation amount and a harmonic injection strategy through a gradient descent algorithm, and performing harmonic injection control. And a global optimal strategy considering the heat dissipation efficiency and the operation stability is formed, and the operation stability and the energy efficiency level of the inverter compressor under various working conditions are remarkably improved.

The invention provides a permanent magnet motor and a scroll inverter compressor, and relates to the technical field of scroll compressor design and manufacturing, and the permanent magnet motor comprises a stator iron core and a rotor iron core; the stator core comprises stator teeth and a stator yoke which are uniformly distributed along the circumference, fluid through grooves are formed in the outer side of the stator yoke at the tops of the stator teeth, stator grooves are formed in two adjacent stator teeth and the stator yoke between the two stator teeth, and a plurality of strands of conductive circular enameled wires are embedded in each stator groove; the outer side of the rotor core is composed of linear segments and arcs, air grooves which are evenly distributed are formed in the rotor core, non-uniform magnetic isolation bridges are formed between the air grooves and the linear segments on the outer side of the rotor core, a certain distance is formed between every two adjacent air grooves, parallel magnetic conductive ribs are formed, and permanent magnets with the magnetic field directions changing alternately are embedded in the air grooves. A rivet hole, a lightening hole and a shaft hole are arranged close to the inner side of the rotor core. Therefore, the defined proportionality coefficient Ks is kept in a reasonable range, the power density of the motor can be increased, the cost is reduced, and the efficiency is improved.

The invention provides a rotor iron core, a permanent magnet motor and an inverter compressor, and relates to the technical field of motor and compressor design and manufacture, the rotor iron core comprises uniformly distributed permanent magnet grooves, a groove is arranged between two adjacent permanent magnet grooves, each groove extends inwards along the radial direction of the rotor iron core, parallel magnetic bridges are arranged between the grooves and the permanent magnet grooves, and the permanent magnet grooves are connected with the parallel magnetic bridges. A first magnetic barrier groove, a second magnetic barrier groove and a third magnetic barrier groove which are symmetrically distributed are formed in the two sides of the top of each permanent magnet groove respectively, a first arc and a second arc are arranged on the outer side of the rotor core above the magnetic barrier grooves, the second arc intersects with the side edge of the groove, and permanent magnets with alternating magnetism are embedded in the permanent magnet grooves. The radius Rr of the outer side of the rotor iron core, the distance ho from the middle point of the bottom of the permanent magnet groove to the center point of the rotor iron core and the thickness hm of the permanent magnet meet the condition that (Rr-ho) / hm is larger than 2 and smaller than or equal to 3.4. By reasonably arranging the position and the size of the magnetic barrier groove, magnetic circuit distribution can be changed, magnetic flux leakage can be reduced, the power density of the motor can be increased, and electromagnetic vibration noise of the motor and the compressor can be reduced.

The invention provides a low-grade waste heat recovery heat pump load matching control method and system, and relates to the technical field of waste heat recovery. The method comprises the steps that boiler operation parameters are obtained; identifying the change trend of the boiler load, and predicting the change direction and amplitude of the boiler load according to the change trend; determining an expected demand quantity and a target temperature interval of the boiler for the preheated air; generating a pre-regulation frequency instruction of the heat pump inverter compressor; and according to the temperature deviation between the heat pump preheated air outlet temperature and the target temperature interval, the pre-adjusting frequency instruction is corrected, a final frequency instruction is obtained, and a heat pump inverter compressor is controlled to operate. The method aims at solving the problem of response lag of existing single temperature feedback control, it is ensured that the preheating air temperature is stably maintained in the optimal combustion interval of the boiler, meanwhile, the energy efficiency of a heat pump system is optimized, abrasion of key components is reduced, and accurate and cooperative matching of the heating capacity of the heat pump and the preheating requirement of combustion air of the boiler is achieved.

The invention provides a control method and device, refrigeration equipment, electronic equipment and a readable storage medium, and relates to the technical field of refrigeration equipment. When the chamber temperature is larger than the preset temperature threshold value, the inverter compressor is controlled to be started, and the inverter compressor is made to reduce the chamber temperature at the first rotating speed; when the chamber temperature is smaller than or equal to the preset temperature threshold value, the inverter compressor is controlled to stop, the chamber temperature rises under the action of the environment temperature till the chamber temperature is larger than the preset temperature threshold value again, and one-time circulation is formed; the first rotating speed is determined based on the power-on duration ratio in the last circulation. According to the technical scheme, the first rotating speed of the next cycle is dynamically adjusted based on the startup duration ratio in the previous cycle, so that the output power of the inverter compressor is precisely matched with the refrigeration requirement, the inverter compressor operates under the working condition of the optimal rotating speed or operates under the working condition close to the optimal rotating speed, energy consumption of refrigeration equipment is reduced, and the refrigeration efficiency is improved. And the energy-saving effect is better.

The present invention provides a permanent magnet synchronous motor and a variable frequency compressor, which relate to the technical field of compressor design and manufacturing. The permanent magnet synchronous motor includes a stator core and a rotor core arranged inside the stator core; the stator core includes stator teeth uniformly distributed in the circumferential direction, a stator yoke is arranged between two adjacent stator teeth, two adjacent stator teeth and the stator yoke between the two stator teeth form a stator slot, and a winding is embedded in the stator slot; a plurality of uniformly distributed eccentric arcs and straight line segments are arranged in the circumferential direction of the outer edge of the rotor core, uniformly distributed magnetic steel plug holes are arranged inside the rotor core, and a groove is arranged between two adjacent magnetic steel plug holes; a permanent magnet with alternating NS poles is arranged in the magnetic steel plug hole. In the present invention, by limiting the inner diameter Rsi of the stator core, the maximum outer diameter Rro of the rotor core and the axial length Les of the stator core to satisfy: 0.455≤Les / (Rsi+Rro)≤1.264, the torque density of the synchronous motor can be increased and the cost can be reduced.

The present application relates to the technical field of intelligent electric appliances, and provides a method and apparatus for controlling the rotating speed of a variable-frequency compressor of an air conditioner. The method comprises: acquiring a temperature control signal input by a temperature controller and used for representing the mode state of an air conditioner; determining a target mode state of the air conditioner on the basis of the temperature control signal and a preset signal combination mode conversion truth table, and determining a set temperature of the air conditioner in the target mode state, wherein the signal combination mode conversion truth table comprises multiple groups of correspondences between various signal combinations and various mode states of the air conditioner; and determining the rotating speed of a variable-frequency compressor on the basis of the target mode state and the set temperature, and on the basis of the rotating speed of the variable-frequency compressor, controlling the variable-frequency compressor to operate. The method for controlling the rotating speed of a variable-frequency compressor of an air conditioner provided by the present application can effectively improve the rotating speed control efficiency of the variable-frequency compressor, improving the operation flexibility and adjustment performance of the air conditioner, and improving user experience.

The invention discloses an inverter compressor control optimization method based on a commercial refrigerator, and relates to the technical field of refrigeration optimization control, the commercial refrigerator is divided into a plurality of independent temperature control areas, monitoring points are deployed in each area, and refined temperature control and load management are realized; according to the method, the load condition of each temperature control area is recognized through a load index Fzzs, i calculation method of the ith temperature control area based on the cargo load and manual operation behaviors, the dynamic refrigeration requirement of the refrigerator is met by adjusting the refrigerant flow, precise control over each temperature control area is achieved by adopting the refrigerant flow adjusting index Radj, and compared with traditional fixed-frequency compressor adjustment, the dynamic refrigeration requirement of the refrigerator is met. And the refrigerating capacity can be flexibly adjusted according to real-time requirements. And the evaporation pressure and the condensation pressure are monitored through the pressure stability index, an optimization instruction is automatically triggered, the operation parameters of the inverter compressor are adjusted, the refrigerant flow is synchronously optimized, and refrigeration balance of all the areas is ensured.

The invention discloses a linear cooling control method of an environmental test box and the environmental test box. The method comprises the following steps: acquiring the temperature in a to-be-controlled environment test box, the suction pressure of a variable-frequency compressor and the exhaust pressure of the variable-frequency compressor; calculating the linear cooling rate of the to-be-controlled environment test box based on the preset temperature parameter; according to the temperature in the box, the suction pressure of the inverter compressor, the exhaust pressure of the inverter compressor and the linear cooling rate, a database is obtained, and the target rotating speed of the inverter compressor, the target opening degree of an electronic expansion valve, the target rotating speed of an evaporator fan and the target rotating speed of a condenser fan of the to-be-controlled environment test box are calculated based on the database; and based on the calculated target rotating speed of the inverter compressor, the target opening degree of the electronic expansion valve, the target rotating speed of the evaporator fan and the target rotating speed of the condenser fan, the inverter compressor, the electronic expansion valve, the evaporator fan and the condenser fan of the to-be-controlled environment test box are controlled to act, so that linear cooling control over the to-be-controlled environment test box is achieved.

The invention discloses a cascade type high-temperature heat pump system two-stage compression cooperative control method which comprises the following steps that a cascade type heat pump system composed of a low-temperature-stage compression cycle and a high-temperature-stage compression cycle is constructed, and the two stages of cycles are coupled through an intermediate heat exchanger; a variable-frequency compressor is arranged in the low-temperature-stage compression cycle, and a fixed-frequency compressor and an air supplementing and enthalpy increasing device are arranged in the high-temperature-stage compression cycle; dynamically adjusting the strategy; intermediate heat exchanger temperature difference feedback control; a hierarchical start-stop control strategy; fault redundancy control and safety protection are carried out; and optimizing a refrigerant working medium and calculating the charge quantity. The variable frequency compressor is introduced into the low-temperature-stage compression cycle, the frequency of the variable frequency compressor is dynamically adjusted based on system operation working condition parameters, and meanwhile, the system can adjust the operation state in real time according to the environment temperature, the load requirement and the like in combination with opening state optimization of the high-temperature-stage air supply enthalpy increasing device, power consumption waste is effectively reduced, and the energy utilization efficiency is improved.

The invention discloses a control method for a photovoltaic energy storage system, and the method comprises the steps: selecting an operation mode, the operation mode comprises a first mode, and in the first mode, step 1, judging whether the power generation amount of a photovoltaic system is sufficient or not; 2, if the phase change material is sufficient, the photovoltaic system supplies power to the inverter compressor, the operation frequency of the inverter compressor is controlled, the inverter compressor is shut down until the phase change material in the photovoltaic energy storage system reaches the set temperature, and in the process, the battery is charged with surplus electricity; 3, if not, the operation frequency of the inverter compressor is controlled according to the photovoltaic generating capacity at the current moment and the preset temperature condition, and the inverter compressor is shut down until the phase-change material reaches the set temperature; 4, judging whether the photovoltaic generating capacity at the current moment meets the requirement that the inverter compressor operates at the lowest frequency of the standard working condition or not; and 5, if not, power is supplied to the inverter compressor through the battery and the photovoltaic system at the same time, and the inverter compressor is made to operate at the lowest frequency of the standard working condition and shut down until the phase change material reaches the set temperature or the voltage of the battery is lower than the set voltage value. The technical effect that the endurance of the energy storage system can be greatly prolonged while enough energy storage efficiency is guaranteed is achieved.

The invention relates to the technical field of air conditioner refrigeration, and discloses an intelligent energy-saving air conditioner refrigeration system based on the frequency conversion technology and a control method thereof.The intelligent energy-saving air conditioner refrigeration system comprises various sensors used for collecting environment data in real time, and the environment data comprise but not limited to temperature, humidity, illumination and personnel activity information; the control unit is connected with the inverter compressor and the multivariable sensor network and is used for generating a control signal according to the environment data so as to dynamically adjust the operation frequency of the inverter compressor; the control unit comprises a data processing module used for preprocessing environment data collected by the multivariable sensor network; through a multivariable adaptive control algorithm, various environmental factors such as temperature, humidity, illumination and personnel activity information are comprehensively considered, and the operation frequency of the inverter compressor is dynamically adjusted. Compared with a traditional air conditioning system which only depends on a single temperature variable for control, the indoor set temperature can be more precisely maintained, temperature fluctuation is reduced, and the temperature control precision is remarkably improved.

The invention discloses a combined heat and power generation energy storage and supply device based on a PVT double-source heat pump and an operation method, and relates to the technical field of heat pumps and energy storage. The PVT module, the water tank, the air-cooled evaporator, the gas-liquid separator, the direct-current inverter compressor and the electronic expansion valve form a heat pump loop, and double-source utilization of solar photo-thermal and air source heat energy is achieved; the phase change heat storage tank, the storage battery, the electromagnet and the circulating delay relay form a thermoelectric energy storage loop, the phase change unit is driven to rotate and fluctuate through a dynamic magnetic field, and the heat exchange efficiency is enhanced. The irradiator, the current and voltage detection module and the temperature sensor monitor the running state of the system in real time, and the rotating speed of the compressor, the opening degree of the electronic expansion valve and the working period of the cyclic delay relay are regulated and controlled through the controller, so that efficient storage and dynamic release of energy in the combined heat and power generation process are achieved. Heat energy and electric energy can be flexibly provided according to user requirements, and the system operation efficiency and the energy comprehensive utilization rate are improved.

The invention belongs to the technical field of marine high-capacity battery management, and particularly provides a marine high-capacity battery heat dissipation and heating system which comprises a shell-and-tube heat exchanger connected with an inverter compressor through a pipeline, and the inverter compressor is connected with an evaporator; a cooling water coil pipe is arranged in the evaporator; a circulating water coil pipe is arranged in the high-capacity battery pack; an inlet of the cooling water coil pipe is connected with a liquid inlet through a liquid inlet pipeline, an outlet of the cooling water coil pipe is connected with a liquid outlet through a liquid outlet pipeline, the liquid outlet is connected to an inlet of a circulating water coil pipe of the high-capacity battery pack through a cooling pipeline, and a circulating water pump is arranged on the liquid inlet pipeline; an outlet of the high-capacity battery pack circulating water coil pipe is connected with the liquid inlet through a cooling pipeline, heat generated when the high-capacity battery pack works is replaced, and the replaced heat is cooled by the evaporator through a cooling water coil pipe arranged in the evaporator. Accurate temperature regulation and control of the marine high-capacity single battery are completed, the heat dissipation efficiency is improved, and the energy consumption of the whole heat dissipation system is reduced.

The utility model relates to the technical field of variable-frequency refrigeration, in particular to a variable-frequency refrigeration system adopting a hot gas bypass valve for oil return. Comprising an evaporator, a condenser and an inverter compressor, the oil return module is used for returning lubricating oil retained in the evaporator through the inverter compressor; the variable-frequency refrigerating system further comprises a liquid supply module used for adjusting the frequency of the variable-frequency compressor to supply liquid to the evaporator by controlling the air suction superheat degree of the variable-frequency compressor. The auxiliary oil return module is used for assisting the variable-frequency compressor to return the lubricating oil retained in the evaporator; by synchronously increasing the opening degree of the hot gas bypass electronic expansion valve, the opening degree of the liquid supply electronic expansion valve and the frequency of the inverter compressor, the air flow rate in the evaporator and the air suction pipe is increased, the refrigerating capacity of the evaporator is guaranteed, oil return of the inverter compressor is guaranteed, long-term operation of a refrigerating system is achieved, and temperature control precision is not affected.

The invention relates to the technical field of refrigeration house unit control, in particular to a frequency conversion-fixed frequency refrigeration house unit control method based on cooperative control. The method comprises the following steps: establishing a control basis through system initialization and parameter setting, acquiring multi-dimensional data such as temperature in a library, compressor current and door state, and packaging the multi-dimensional data into a system real-time state data packet; performing verification filtering processing on the acquired data to generate a filtering temperature value and a safety state identifier; the real-time temperature difference and the change trend are analyzed based on the temperature data, the load state is determined through a load evaluation model, an inverter compressor independent operation mode or a variable frequency-fixed frequency compressor cooperative operation mode is intelligently selected, and operation parameters are dynamically optimized; and corresponding energy-saving and protection strategies including condensation fan adjustment, heat recovery management, door state linkage control and time-of-use electricity price response are executed according to the operation mode. According to the control method, the defects of a traditional control method in the aspects of energy efficiency and stability are overcome, and intelligent management and energy-saving optimization of the refrigeration house unit are achieved.

The invention provides a CO2 transcritical rail vehicle air conditioner heat pump system and a control method thereof, and belongs to the technical field of rail vehicle air conditioner control. The control method comprises the steps that heat pump system parameter data and vehicle running state data are obtained, and a vehicle condition mode is determined according to the vehicle running state data; according to the determined vehicle condition mode and the heat pump system parameter data, a high-pressure side pressure set value is generated through a preset self-adaptive heat pump regulation and control model; calculating an opening value of the electronic expansion valve according to the generated pressure set value; and according to the generated pressure set value, the rotating speed of the inverter compressor is adjusted through PID closed-loop control, and the opening degree of the electronic expansion valve is adjusted according to the calculated opening degree value of the expansion valve. According to the CO2 transcritical railway vehicle air conditioner heat pump control method, the energy efficiency of a heat pump system is effectively improved, and the adaptability of the heat pump system is greatly improved.

The invention discloses a thermostatic equipment control system based on an electronic expansion valve and electronic equipment, and aims to solve the problems that in the prior art, an inverter compressor is high in cost, and other schemes cannot accurately control heating power. The constant temperature equipment comprises a circulation pipeline formed by sequentially connecting an evaporator, a fixed frequency compressor and a condenser in series and two electronic expansion valves, one electronic expansion valve serves as a refrigeration electronic expansion valve and is located on a pipeline between an outlet of the condenser and an inlet of the evaporator, and the other electronic expansion valve serves as a hot gas bypass electronic expansion valve and is located on a pipeline between an outlet of the condenser and an inlet of the evaporator. The condenser is integrally connected with the refrigeration electronic expansion valve in parallel; the control system comprises a first PID (Proportion Integration Differentiation) controller, a second PID controller and a third PID controller; the opening degree of the hot gas bypass electronic expansion valve and the opening degree of the refrigeration electronic expansion valve are determined based on the PIDValue 1, the PIDValue 2 and the PIDValue 3 output by the control system, and control over the constant temperature system is achieved.

A carbon dioxide overlapping type heating system and a control method therefor, in which the heating system includes a low-temperature-stage loop, high-temperature-stage loop and a heating loop, in which a temperature-stage compressor (3) and a high-temperature-stage compressor (7) are both variable-frequency compressors; and a water pump (10) is a variable-frequency water pump.

The invention relates to a parallel double-evaporator cold storage and supply system and a control method. A medium-temperature evaporator and an ice storage device integrating evaporators are connected in parallel and share the same inverter compressor, a condenser and a matched condenser fan; four operation modes of independent cold storage, independent direct cold supply, simultaneous cold storage cold supply and ice melting cold supply are realized; the controller is connected with the medium-temperature evaporator and the ice storage device integrated with the evaporator and used for flexibly switching operation modes according to the actual cold storage and supply requirements and the peak-valley electricity price policy, and low-energy-consumption and low-cost operation of the system is achieved. The control method comprises an independent cold storage operation mode, an independent direct cold supply operation mode, a simultaneous cold storage and cold supply operation mode and an ice melting and cold supply operation mode. The system form that the two evaporators are connected in parallel can achieve dual purposes, the evaporators and the ice storage device are integrated so that direct heat exchange between refrigerants and water can be achieved, the evaporation temperature of the refrigerants is increased, and low-energy-consumption and low-cost operation of the system is achieved.

The application discloses a kind of based on commercial refrigerator's variable frequency compressor control optimization method, it is related to refrigeration optimization control technical field, the commercial refrigerator is divided into multiple independent temperature control regions, and monitoring point is deployed in each region, realizes fine temperature control and load management;Based on the load index F of the i temperature control region of goods load and artificial operation behavior zzs,i Calculation method is used to identify the load condition of each temperature control region, and the dynamic refrigeration demand of the refrigerator is met by adjusting the refrigerant flow, and the refrigerant flow adjustment index R_adj is used to realize accurate control of each temperature control region, compared with the traditional fixed-frequency compressor adjustment, the refrigeration capacity can be flexibly adjusted according to real-time demand. The pressure stability index is used to monitor the evaporation pressure and condensation pressure, and automatically trigger the optimization instruction to adjust the operating parameters of the variable frequency compressor and simultaneously optimize the refrigerant flow to ensure the balance of refrigeration in each region.

The invention discloses a linear cooling control method of an environmental test box and the environmental test box. The method comprises the following steps: acquiring the temperature in a to-be-controlled environment test box, the outlet temperature of an evaporator, the liquid supply temperature of a condenser, the suction pressure of a variable-frequency compressor and the exhaust pressure of the variable-frequency compressor; according to the temperature in the box, the evaporator outlet temperature, the condenser liquid supply temperature, the frequency conversion compressor suction pressure, the frequency conversion compressor exhaust pressure and preset parameters, the frequency conversion compressor rotating speed, the electronic expansion valve opening degree, the evaporator fan rotating speed and the condenser fan rotating speed of the to-be-controlled environment test box are calculated; based on the calculated rotating speed of the inverter compressor, the calculated opening degree of the electronic expansion valve, the calculated rotating speed of the evaporator fan and the calculated rotating speed of the condenser fan, the inverter compressor, the electronic expansion valve, the evaporator fan and the condenser fan of the to-be-controlled environment test box are controlled respectively, and linear cooling control over the to-be-controlled environment test box is achieved.

The present invention discloses a refrigerator, a variable frequency compressor and a control method for a variable frequency compressor. The refrigerator includes a variable frequency compressor, an ambient temperature sensor and a variable frequency controller. After the variable frequency compressor is powered on, the current number of on-off cycles of the variable frequency compressor is determined in response to a preset operating parameter control instruction. If it is after N on-off cycles, the target start-up rate at the current ambient temperature is determined according to the current ambient temperature, and then the corresponding operating parameter adjustment rules are determined. According to the start-up rate of the variable frequency compressor in the previous on-off cycle and the operating parameter adjustment rules, the operating parameters of the previous on-off cycle are adjusted accordingly, and the variable frequency compressor is controlled to operate with the adjusted operating parameters when it starts running. By adopting the technical means of the embodiments of the present invention, the frequency adjustment of the variable frequency compressor can be effectively achieved, so that the variable frequency compressor can achieve better working efficiency, thereby providing users with a good user experience.

According to the double-source heat pump system, intelligent compensation is conducted through external energy, the energy is utilized to the maximum extent, the commercial power input proportion of a heat pump is reduced, and the economic cost is saved. The inverter compressor assembly comprises an inverter compressor, a four-way valve, a gas-liquid separator, a high-voltage switch and a low-voltage switch; the water side heat exchanger comprises a water pipe and a heat exchange pipe assembly, the water pipe is provided with a heating water inlet end and a heating water outlet end, the heat exchange pipe assembly is located in an inner cavity of the water pipe, and the heat exchange pipe assembly comprises a medium inlet and a medium outlet; a liquid reservoir; the two groups of electronic expansion valves comprise a first electronic expansion valve and a second electronic expansion valve; the fin type heat exchanger comprises a fin coil pipe and a fan assembly; and the plate heat exchanger comprises a refrigerant heat exchange channel and an external heat exchange water channel.

The invention discloses a refrigeration control method based on inverter compressor control, which relates to the technical field of refrigeration equipment control, and comprises the following steps: acquiring operation data of a refrigeration system according to a preset period, and extracting a thermal response characteristic representing a cooling rate attenuation acceleration by performing differential processing on an indoor temperature; and calculating a thermal rebound sensitivity characteristic by combining the frequency change gradient. A thermal inertia potential energy index representing the heat storage load of the enclosure structure is generated through time domain accumulation processing, a nonlinear drift modulation model is constructed accordingly, and a virtual set temperature and a dynamic frequency lower limit value are generated. And finally calculating a basic adjusting frequency based on the virtual set temperature, and selecting the maximum value of the basic adjusting frequency and the lower limit value of the dynamic frequency as a target driving frequency. Through cooperation of algorithm soft traction and physical hard lifting, the problem of overshoot oscillation in a complex thermal environment is solved, and temperature control stability and energy saving performance are improved.

The embodiment of the invention discloses a linear cooling control method for an environmental test chamber, which comprises the following steps of: determining the rotating speed of a variable-frequency compressor of each equally divided cooling section according to a cooling theoretical parameter of each equally divided cooling section, a second cooling parameter of the environmental test chamber, a linear cooling rate and an operating parameter of the variable-frequency compressor; according to the cooling theoretical parameter of each equally divided cooling section, the third cooling parameter of the environmental test box, the linear cooling rate and the electronic expansion valve operation parameter, determining the electronic expansion valve step opening of each equally divided cooling section; according to the first operation data of the inverter compressor and the evaporator in each equally divided cooling section, the final temperature of the environmental test box, the operation parameters of the evaporator fan and the linear cooling rate, the rotation speed of the evaporator fan in each equally divided cooling section is determined; and according to the second operation data of the inverter compressor and the condenser in each equally divided cooling section, the operation parameters of the condenser fan and the linear cooling rate, the rotating speed of the condenser fan in each equally divided cooling section is determined.

The invention relates to a variable-speed water pumping and compressed air hybrid energy storage test verification device and method, and belongs to the technical field of energy storage. Comprising a pool tank assembly, a common-capacity tank assembly, a pumped storage unit and a compressor which are sequentially connected, the pumped storage unit is a variable-speed pumped storage unit, and the compressor is a variable-frequency compressor. The test device provided by the invention is reasonable in design and low in cost, can be extremely flexibly operated in working conditions of pressure prefabrication, energy storage, power generation, enhanced heat exchange and near-constant water head operation, and can be used for comprehensively verifying key indexes so as to determine the feasibility of the test device.

The embodiment of the invention discloses a cooling control method for a test box and the test box, and the method comprises the steps: determining the rotating speed control deviation of a variable-frequency compressor through the current temperature in the test box and a preset temperature parameter; the rotating speed control gain coefficient of the inverter compressor is determined by using the opening degree of the electronic expansion valve and the equipment temperature parameters of other equipment in the test box, and then the rotating speed of the inverter compressor is calculated by using the rotating speed control deviation and the first gain coefficient; the technical problems that in the prior art, an environment test box only depends on the maximum refrigerating capacity to conduct model selection of a fixed-frequency compressor, the energy consumption of the fixed-frequency compressor is high, and the capacity is wasted in the initial operation stage are solved, and a variable-frequency compressor can be used in the test box to replace a traditional fixed-frequency compressor. The technical effects of performing high-precision refrigeration control on the inverter compressor and reducing the energy consumption of the compressor in the test box are achieved.

According to the variable-frequency defrosting control method for the air energy heat pump, the air energy heat pump comprises a variable-frequency compressor, and during operation, the method comprises the following steps that firstly, the heat pump operates in a heating mode, and then the second step is executed; (2) defrosting is started, timing of Tk is started, Tk is the current defrosting operation total time, and the step (3) is executed; 3, the central controller of the heat pump judges whether th is smaller than or equal to ts or not, if yes, the fourth step is executed, and if not, the sixth step is executed, th is the current environment temperature, ts is the preset temperature, and the value range of ts is-2 DEG C to 5 DEG C; fourthly, the central controller controls the compressor to operate at the first defrosting frequency P1, the fifth step is executed, and the value range of P1 ranges from 70 Hz to 85 Hz; and step 5, running for a first period T1. The method has the characteristics that the defrosting efficiency is improved, the defrosting time is shortened, and the operation stability and the heating efficiency of the air energy heat pump are improved.