CN114704892A - Distributed solar air conditioner control system - Google Patents

Distributed solar air conditioner control system Download PDF

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Publication number
CN114704892A
CN114704892A CN202210350262.5A CN202210350262A CN114704892A CN 114704892 A CN114704892 A CN 114704892A CN 202210350262 A CN202210350262 A CN 202210350262A CN 114704892 A CN114704892 A CN 114704892A
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China
Prior art keywords
control unit
reduced
compressor
mppt control
power
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CN202210350262.5A
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Chinese (zh)
Inventor
刘志高
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Changzhou Shiboen New Energy Technology Co ltd
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Changzhou Shiboen New Energy Technology Co ltd
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Priority to CN202210350262.5A priority Critical patent/CN114704892A/en
Publication of CN114704892A publication Critical patent/CN114704892A/en
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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
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F24F2005/0064—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy
    • F24F2005/0067—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground using solar energy with photovoltaic panels
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Human Computer Interaction (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a distributed solar air-conditioning control system which comprises a photovoltaic panel, an Mppt control unit, an energy storage battery control unit and a plurality of loads, wherein the loads comprise an outdoor controller of a variable-frequency air conditioner and an indoor controller of the variable-frequency air conditioner; the outdoor controller of the variable frequency air conditioner is connected between the indoor controller of the variable frequency air conditioner and the direct current bus; the distributed solar air conditioner control system adjusts the running power of the load according to the rated power of the photovoltaic panel and the environmental temperature difference, so that the photovoltaic direct current is fully utilized, and the requirements of users can be met.

Description

Distributed solar air conditioner control system
Technical Field
The invention relates to the field of air conditioner control, in particular to a distributed solar air conditioner control system.
Background
With the development of new materials and new technologies, the solar photovoltaic conversion rate is higher and higher, the investment is less and less, and the application of solar photovoltaic power generation is wider and wider. In modern society life, household and commercial air conditioners with high power consumption are used, tens of millions of air conditioners are used every year, if direct current generated by solar photovoltaic is not required to be inverted and connected to the power grid, the direct current generated by photovoltaic can be used to the greatest extent, the power consumption can be greatly reduced, and the direct current generated by photovoltaic can be used to the greatest extent. The solar photovoltaic power generation is influenced by longitude and latitude of a geographic position, solar illumination intensity, cloud and fog weather and the like, and a generated direct current electrode is unstable, so that the photovoltaic power generation is limited by various conditions during application. Therefore, how to reasonably use the solar photovoltaic direct current and use the solar photovoltaic direct current as preferentially as possible becomes a problem to be solved firstly.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problems that in the prior art, the direct-current voltage of solar energy is unstable and how to reasonably use the direct current of photovoltaic energy, the invention provides a distributed solar air-conditioning control system to solve the problems.
The technical scheme adopted by the invention for solving the technical problems is as follows: a distributed solar air-conditioning control system is provided,
the photovoltaic panel is connected with the Mppt control unit, and the output end of the Mppt control unit is connected to a direct-current bus; the outdoor controller of the variable frequency air conditioner is connected between the indoor controller of the variable frequency air conditioner and the direct current bus;
the Mppt control unit is configured to:
when the circuit is unloaded, the Mppt control unit outputs 370V voltage;
when the load power is increased to 85% of the rated power of the photovoltaic panel, the voltage output by the Mppt control unit is reduced to 360V, and the outdoor controller of the variable frequency air conditioner controls the running frequency of the compressor to be reduced;
when the load power is maintained to be 80%, 85% of the rated power, the running frequency of the compressor is controlled to be kept unchanged;
when the load power is reduced and is less than 80% of the rated power, the voltage output by the Mppt control unit is increased to 365V;
when the load power is reduced and is less than 70% of the rated power, the voltage output by the Mppt control unit is increased to 370V;
the method comprises the steps of detecting the current loop temperature difference delta T before controlling the running frequency of the compressor to be reduced, and comparing the loop temperature difference delta T with a preset temperature difference threshold value.
Preferably, the Mppt control unit is configured to:
when the load power is increased and is more than 90% and less than 95% of the rated power, the voltage output by the Mppt control unit is reduced to 350V, and the operation frequency of the compressor is controlled to be reduced and is more than or equal to the minimum operation frequency;
when the load power is reduced and is less than 80% of the rated power, the operation frequency of the compressor is controlled to be increased, and the voltage output by the Mppt control unit is increased to 355V;
the method comprises the steps of detecting the current loop temperature difference delta T before controlling the running frequency of the compressor to be reduced, and comparing the loop temperature difference delta T with a preset temperature difference threshold value.
Preferably, the Mppt control unit is configured to:
when the load power rises and is greater than 95% of the rated power, stopping at least one load, and controlling the running frequency of the compressor without stopping the load to fall;
the method comprises the steps of detecting the current loop temperature difference delta T before controlling the running frequency of the compressor to be reduced, and comparing the loop temperature difference delta T with a preset temperature difference threshold value.
Preferably, when the voltage value on the direct current bus is detected to be reduced, the running frequency of the compressor is controlled to be reduced for a time T4 when the voltage value is less than or equal to the voltage value of the direct current bus T4;
when the running frequency of the compressor still needs to be reduced after the duration T4, if the delta T4 is less than or equal to delta T3, controlling the running frequency of the compressor to be reduced for the duration T3;
when the operation frequency of the compressor still needs to be reduced after the duration T3, if the operation frequency is more than delta T3 and less than or equal to delta T2, the operation frequency of the compressor is controlled to be reduced for the duration T2;
and when the running frequency of the compressor still needs to be reduced after the duration T2, if the delta T2 is less than or equal to delta T1, controlling the running frequency of the compressor to be reduced for the duration T1.
Preferably, the Mppt control unit is connected in series with the disturbance resistor R and the field effect transistor MOSFET.
Preferably, the power supply further comprises an alternating current input end, a rectifying module, a Boost circuit and a master controller, wherein the rectifying module is configured to rectify an alternating current voltage input by the alternating current input end;
the Boost circuit is connected with the rectifying module and is configured to perform power factor correction on the pulsating direct-current voltage output by the rectifying module;
the Boost circuit is connected with an outdoor controller of the variable frequency air conditioner through a direct current bus;
the master controller is also respectively connected with the Mppt control unit and the Boost circuit;
the overall controller is configured to:
the voltage value output by the Mppt control unit is detected, when the voltage value output by the Mppt control unit is larger than or equal to a preset voltage threshold value, the Boost circuit is closed to store energy, when the voltage value output by the Mppt control unit is smaller than the preset voltage threshold value, the Boost circuit is opened to discharge the Boost circuit, and at the moment, the Mppt control unit, the rectifying module and the Boost circuit supply power to a load in the same direction.
Preferably, the overall controller is configured to regulate the duty cycle DuTo control the output voltage value of the Boost circuit.
Preferably, the Boost circuit comprises an energy storage inductor L, an insulated gate bipolar transistor IGBT, a regulator IC and a power tube D, wherein a collector of the insulated gate bipolar transistor IGBT is connected between the energy storage inductor L and the power tube D, an emitter and the energy storage inductor L are connected with a rectification module, a gate is connected with the regulator IC, the regulator IC is connected with a master controller, and the power tube D is connected with a direct current bus.
Preferably, the filtering module comprises a capacitor C1, a capacitor C2 and a capacitor C3 which are connected in parallel on the direct current bus.
The distributed solar air conditioner control system has the beneficial effects that the running power of the load is adjusted according to the rated power of the photovoltaic panel and the environmental temperature difference, so that the photovoltaic direct current is fully utilized, and the requirements of users can be met.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural diagram of a preferred embodiment of a distributed solar air-conditioning control system according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, the present invention provides an embodiment of a distributed solar air-conditioning control system, which includes a photovoltaic panel, an Mppt control unit, an energy storage battery control unit, an ac input terminal, a rectifier module, a Boost circuit, a master controller, and a plurality of loads, where the loads include an outdoor controller of a variable-frequency air conditioner and an indoor controller of the variable-frequency air conditioner, the photovoltaic panel is connected with the Mppt control unit, an output terminal of the Mppt control unit is connected to a dc bus, the Mppt control unit is connected in series to a disturbance resistor R and a field effect transistor MOSFET, and when an output voltage is substantially stable, an average current passing through the disturbance resistor R is changed by changing a duty ratio of the MOSFET, so that current disturbance is generated. Meanwhile, the output current and voltage of the photovoltaic cell are also influenced, and the disturbance direction of the next period is determined by measuring the change at the moment. If the disturbance direction is correct, the output power of the solar energy light energy plate is increased, the solar energy light energy plate continuously disturbs in the same direction in the next period, otherwise, disturbs in the opposite direction, and the steps are repeated, so that the output reaches the maximum power point. The outdoor controller of the variable frequency air conditioner is connected between the indoor controller of the variable frequency air conditioner and the direct current bus. The rectification module is configured to rectify an alternating-current voltage input from the alternating-current input end; the Boost circuit is connected with the rectifying module and is configured to perform power factor correction on the pulsating direct-current voltage output by the rectifying module; the Boost circuit is connected with an outdoor controller of the variable frequency air conditioner through a direct current bus; the master controller is also respectively connected with the Mppt control unit and the Boost circuit.
The Boost circuit comprises an energy storage inductor L, an insulated gate bipolar transistor IGBT, a regulator IC and a power tube D, wherein a collector electrode of the insulated gate bipolar transistor IGBT is connected between the energy storage inductor L and the power tube D, an emitter electrode and the energy storage inductor L are connected with a rectification module, a gate electrode is connected with the regulator IC, the regulator IC is connected with a master controller, and the power tube D is connected on a direct current bus. The filtering module comprises a capacitor C1, a capacitor C2 and a capacitor C3 which are connected in parallel on the direct current bus.
The overall controller is configured to:
the voltage value output by the Mppt control unit is detected, when the voltage value of the Mppt control unit is larger than or equal to a preset voltage threshold value, the insulated gate bipolar transistor IGBT is closed through the regulator IC, so that the Boost circuit is closed, the energy storage inductor L stores energy, when the voltage value output by the Mppt control unit is smaller than the preset voltage threshold value, the insulated gate bipolar transistor IGBT is disconnected, the Boost circuit is opened, the Boost circuit is discharged, and at the moment, the light Mppt control unit, the rectifying module and the Boost circuit supply power to a load in the same direction. The on-time of IGBT is duty ratio, and the switching period is DuT, when the IGBT is disconnected, the energy storage inductor L discharges to the load through the power tube D, and the rectified direct current also discharges to the load, and the rectified direct current and the load are superposed to realize boosting and discharge time Dt(1-duty cycle) ═ switching period ═ 1-Du) T. The charging and discharging of the energy storage inductor L is substantially the same during both the off and on times of the IGBT. Then (V)in*Du*T)/L＝{(Vout-Vin)*(1-Du) T }/L; then Vout＝Vin/(1-Du) So that the boosted DC voltage value depends on the duty ratio D of the IGBTu. Wherein VinFor rectified DC voltage, VoutFor the boosted DC voltage, L is the energy storage inductance, DuIs the duty cycle, T is the switching period. The master controller adjusts the duty ratio DuTo control the output voltage value V of the Boost circuitout. The quantity of the photovoltaic power generation part can be compensated.
The Mppt control unit is configured to:
when the circuit is unloaded, the Mppt control unit outputs 370V voltage;
in the interval A, when the load power is increased to 85% of the rated power of the photovoltaic panel, the voltage output by the Mppt control unit is reduced to 360V, and the outdoor controller of the variable frequency air conditioner controls the running frequency of the compressor to be reduced;
when the load power is maintained to be 80%, 85% of the rated power, the running frequency of the compressor is controlled to be kept unchanged;
when the load power is reduced and is less than 80% of the rated power, the voltage output by the Mppt control unit is increased to 365V;
when the load power is reduced and is less than 70% of the rated power, the voltage output by the Mppt control unit is increased to 370V;
in the interval B, when the load power is increased and is greater than 90% and less than 95% of the rated power, the voltage output by the Mppt control unit is reduced to 350V, and the operation frequency of the compressor is controlled to be reduced and is greater than or equal to the minimum operation frequency;
when the load power is reduced and is less than 80% of the rated power, the operation frequency of the compressor is controlled to be increased, and the voltage output by the Mppt control unit is increased to 355V; at this time, the load stability was maintained continuously, and after the holding time was longer than 5 minutes, the section a was judged.
In the interval C, when the load power rises and is greater than 95 percent of the rated power, stopping at least one load, not allowing a new load to run, and controlling the running frequency of the compressor without stopping the load to drop until the load power is less than 90 percent of the rated power;
the method comprises the steps of detecting the current loop temperature difference delta T before controlling the operation frequency of the compressor to be reduced, and comparing the loop temperature difference delta T with a preset temperature difference threshold value.
When the delta T is less than or equal to the delta T4, once the voltage value on the direct current bus is detected to be reduced, the running frequency of the compressor is controlled to be reduced for a time T4;
when the running frequency of the compressor still needs to be reduced after the duration T4, if the delta T4 is less than or equal to delta T3, controlling the running frequency of the compressor to be reduced for the duration T3;
when the running frequency of the compressor still needs to be reduced after the duration T3, if the delta T3 is less than or equal to delta T2, controlling the running frequency of the compressor to be reduced for the duration T2;
and when the running frequency of the compressor still needs to be reduced after the duration T2, if the delta T2 is less than or equal to delta T1, controlling the running frequency of the compressor to be reduced for the duration T1.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (9)

1. The utility model provides a distributed solar air conditioner control system which characterized in that:
the photovoltaic panel is connected with the Mppt control unit, and the output end of the Mppt control unit is connected to a direct-current bus; the outdoor controller of the variable frequency air conditioner is connected between the indoor controller of the variable frequency air conditioner and the direct current bus;
the Mppt control unit is configured to:
when the circuit is unloaded, the Mppt control unit outputs 370V voltage;
when the load power is increased to 85% of the rated power of the photovoltaic panel, the voltage output by the Mppt control unit is reduced to 360V, and the outdoor controller of the variable frequency air conditioner controls the running frequency of the compressor to be reduced;
when the load power is maintained to be 80%, 85% of the rated power, the running frequency of the compressor is controlled to be kept unchanged;
when the load power is reduced and is less than 80% of the rated power, the voltage output by the Mppt control unit is increased to 365V;
when the load power is reduced and is less than 70% of the rated power, the voltage output by the Mppt control unit is increased to 370V;
the method comprises the steps of detecting the current loop temperature difference delta T before controlling the running frequency of the compressor to be reduced, and comparing the loop temperature difference delta T with a preset temperature difference threshold value.
2. The distributed solar air conditioning control system of claim 1, wherein:
the Mppt control unit is configured to:
when the load power is increased and is more than 90% and less than 95% of the rated power, the voltage output by the Mppt control unit is reduced to 350V, and the operation frequency of the compressor is controlled to be reduced and is more than or equal to the minimum operation frequency;
when the load power is reduced and is less than 80% of the rated power, the operation frequency of the compressor is controlled to be increased, and the voltage output by the Mppt control unit is increased to 355V;
the method comprises the steps of detecting the current loop temperature difference delta T before controlling the running frequency of the compressor to be reduced, and comparing the loop temperature difference delta T with a preset temperature difference threshold value.
3. The distributed solar air conditioning control system of claim 2, wherein:
the Mppt control unit is configured to:
when the load power rises and is greater than 95% of the rated power, stopping at least one load, and controlling the running frequency of the compressor without stopping the load to fall;
the method comprises the steps of detecting the current loop temperature difference delta T before controlling the running frequency of the compressor to be reduced, and comparing the loop temperature difference delta T with a preset temperature difference threshold value.
4. The distributed solar air conditioning control system of claim 3, wherein:
when the delta T is less than or equal to the delta T4, once the voltage value on the direct current bus is detected to be reduced, the running frequency of the compressor is controlled to be reduced for a time T4;
when the running frequency of the compressor still needs to be reduced after the duration T4, if the delta T4 is less than or equal to delta T3, controlling the running frequency of the compressor to be reduced for the duration T3;
when the running frequency of the compressor still needs to be reduced after the duration T3, if the delta T3 is less than or equal to delta T2, controlling the running frequency of the compressor to be reduced for the duration T2;
and when the running frequency of the compressor still needs to be reduced after the duration T2, if the delta T2 is less than or equal to delta T1, controlling the running frequency of the compressor to be reduced for the duration T1.
5. The distributed solar air conditioning control system of claim 4, wherein: the Mppt control unit is connected in series with the disturbance resistor R and the field effect transistor MOSFET.
6. The distributed solar air conditioning control system of claim 5, wherein: the intelligent power supply also comprises an alternating current input end, a rectifying module, a Boost circuit and a master controller, wherein the rectifying module is configured to rectify alternating current voltage input by the alternating current input end;
the Boost circuit is connected with the rectifying module and is configured to perform power factor correction on the pulsating direct-current voltage output by the rectifying module;
the Boost circuit is connected with an outdoor controller of the variable frequency air conditioner through a direct current bus;
the master controller is also respectively connected with the Mppt control unit and the Boost circuit;
the overall controller is configured to:
the voltage value output by the Mppt control unit is detected, when the voltage value output by the Mppt control unit is larger than or equal to a preset voltage threshold value, the Boost circuit is closed to store energy, when the voltage value output by the Mppt control unit is smaller than the preset voltage threshold value, the Boost circuit is opened to discharge the Boost circuit, and at the moment, the Mppt control unit, the rectifying module and the Boost circuit supply power to a load in the same direction.
7. The distributed solar air conditioning control system of claim 6, wherein: the overall controller is configured to regulate the duty cycle DuTo control the output voltage value of the Boost circuit.
8. The distributed solar air conditioning control system of claim 7, wherein: the Boost circuit comprises an energy storage inductor L, an insulated gate bipolar transistor IGBT, a regulator IC and a power tube D, wherein a collector electrode of the insulated gate bipolar transistor IGBT is connected between the energy storage inductor L and the power tube D, an emitter electrode and the energy storage inductor L are connected with a rectifying module, a gate electrode is connected with the regulator IC, the regulator IC is connected with a master controller, and the power tube D is connected on a direct current bus.
9. The distributed solar air conditioning control system of claim 8, wherein: the filtering module comprises a capacitor C1, a capacitor C2 and a capacitor C3 which are connected to the direct current bus in parallel.
CN202210350262.5A 2022-04-02 2022-04-02 Distributed solar air conditioner control system Pending CN114704892A (en)

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