CN110553308A - energy collaborative operation control system - Google Patents
energy collaborative operation control system Download PDFInfo
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- CN110553308A CN110553308A CN201810554182.5A CN201810554182A CN110553308A CN 110553308 A CN110553308 A CN 110553308A CN 201810554182 A CN201810554182 A CN 201810554182A CN 110553308 A CN110553308 A CN 110553308A
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- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 238000011217 control strategy Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 68
- 230000005611 electricity Effects 0.000 claims description 47
- 238000003860 storage Methods 0.000 claims description 29
- 238000010248 power generation Methods 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 238000005057 refrigeration Methods 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 20
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- 239000007789 gas Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 12
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- 238000004590 computer program Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004422 calculation algorithm Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
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- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1045—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump and solar energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to an energy collaborative operation control system, which comprises a distributed photovoltaic unit, an air source heat pump unit and a control module; the distributed photovoltaic unit is in one-way connection with the air source heat pump unit, the air source heat pump unit is in two-way connection with the control module, and the distributed photovoltaic unit is in two-way connection with the power grid; the distributed photovoltaic units supply power to the air source heat pump or are connected with a power grid in the peak period of power utilization; the air source heat pump unit utilizes a low-level heat source to perform heat energy heating; the control module controls the distributed photovoltaic units to supply power to the air source heat pump units according to a predefined control strategy, so that the temperature value is within a predefined temperature range; the predefined control strategy comprises the steps of controlling the distributed photovoltaic units to be connected to the grid, controlling the air source heat pump to be started or stopped and carrying out fuzzy control on the air source heat pump. The indoor temperature of the user is effectively adjusted in real time through fuzzy control, the phenomenon of insufficient or excessive heating in the traditional heating is avoided, and the economic benefit of the user is maximized.
Description
Technical Field
the invention relates to a control system, in particular to an energy collaborative operation control system.
background
The rapid development of economy has created an urgent need for power growth, and the occurrence of phenomena such as large-area power failure accidents and power failure and limitation reflects the stability and reliability problems of the conventional large-scale centralized power supply. The development of the distributed power generation technology can relieve the power supply pressure of power transmission and distribution and the local power shortage to a certain extent, improve the reliability and stability of power grid operation, and ensure the power demand of users in remote mountainous areas without large power grid coverage.
The air source heat pump can absorb heat from the surrounding environment and transfer the heat to the heated object building by consuming a small amount of high-grade energy, thereby realizing the reutilization of a large amount of natural resources and waste heat. Meanwhile, the air source heat pump water heating device has the advantages of various forms, compact structure, high reliability, obvious energy conservation, long service life and the like, and does not have the problems of large occupied area, and serious energy consumption and pollution of various hot water boilers, thereby meeting the requirement trend of integrating the hot water boilers with buildings. Air conditioning technology has been widely used in various fields of national economy and various aspects of people's life. Therefore, the intelligent temperature regulation of the air conditioner is comprehensively considered aiming at the control of the air source heat pump so as to meet the requirements of energy conservation, environmental protection, economy and reasonability.
the current control usually adopts a traditional large-scale centralized PID control method, the algorithm of the method is simpler, but due to the fact that distributed power supply and heating are nonlinear complex systems, when a PID controller with adjusted parameters is applied to another system with different model parameters, the performance of the system becomes poor or even unstable, effective and real-time adjustment cannot be carried out on electricity price information and the indoor temperature of a user, and resource waste is caused.
Disclosure of Invention
In order to make up for the defects, the invention provides an energy collaborative operation control system, which meets the power supply requirement of a distributed photovoltaic air source heat pump, relieves the power utilization pressure of a power grid, effectively adjusts the indoor temperature of a user in real time through fuzzy control, realizes heating according to the requirement, saves energy, avoids the phenomenon of insufficient heating or excessive heating in the traditional heating, and improves the economy of the power utilization of the user.
the invention is realized by adopting the following technical scheme:
An energy source collaborative operation control system, the system comprising: the system comprises a distributed photovoltaic unit, an air source heat pump unit and a control module; the distributed photovoltaic unit is in one-way connection with the air source heat pump unit, the air source heat pump unit is in two-way connection with the control module, and the distributed photovoltaic unit is in two-way connection with the power grid; wherein,
The distributed photovoltaic unit is used for supplying power to the air source heat pump or being connected with a power grid in the peak period of power utilization;
The air source heat pump unit is used for heating by utilizing heat energy of a low-level heat source;
the control module is used for controlling the distributed photovoltaic units to supply power to the air source heat pump units according to a predefined control strategy, so that the temperature value is within a predefined temperature range;
the predefined control strategy comprises the steps of controlling the distributed photovoltaic units to be connected to the grid, controlling the air source heat pump to be started or stopped and carrying out fuzzy control on the air source heat pump.
preferably, the control module includes:
the detection unit is used for detecting a time range and judging the peak-valley time period of the power consumption;
The acquiring unit is used for acquiring the electricity selling price and the electricity purchasing price of the power grid when the photovoltaic power generation supplies power to the air source heat pump;
A pre-defining unit for defining an average value of the indoor temperature as a temperature threshold; the indoor temperature is acquired by temperature sensors, and the temperature sensors are multiple and are arranged in different houses;
The comparison unit is used for comparing the heat/cold quantity generated by the air source heat pump with the predefined temperature threshold value;
the selecting unit is used for selecting the power supply end of the air source heat pump according to the acquired information of the acquiring unit;
And the management unit is used for managing the air source heat pump according to the detection result obtained by the detection unit and the comparison information obtained by the execution comparison unit.
Further, the selecting unit includes:
The first execution subunit is used for controlling all photovoltaic power generation to be on line when the electricity purchasing price of the photovoltaic power grid in the current time period is greater than the electricity selling price, and the electricity used by the air source heat pump is supplied by the power grid;
and the second execution subunit is used for controlling the photovoltaic power generation to directly supply power to the air source heat pump when the electricity purchase price of the photovoltaic power grid in the current time period is less than the electricity sale price, and surfing the internet when the photovoltaic power generation is surplus.
further, the management unit includes:
the third execution subunit is used for controlling the distributed photovoltaic unit to be connected to the grid or enabling the air source heat pump to stop working if the heat/cold quantity sent by the air source heat pump is larger than a temperature threshold value in the peak period of power utilization;
And the fourth execution subunit is used for performing fuzzy control on the air source heat pump in the electricity utilization valley period if the heat/cold quantity sent by the air source heat pump is greater than a predefined temperature threshold value.
Preferably, the distributed photovoltaic unit comprises: the system comprises a solar photovoltaic panel and a direct current combiner box photovoltaic grid-connected inverter;
the solar photovoltaic panel is connected with the direct current header box, the direct current header box is connected with the photovoltaic grid-connected inverter, one end of the photovoltaic grid-connected inverter is connected with the air source heat pump unit, and the other end of the photovoltaic grid-connected inverter is connected with the power grid for grid connection.
Further, the solar photovoltaic panel is used for generating direct current;
the direct current combiner box is used for being connected into a plurality of photovoltaic matrixes in parallel to carry out combiner;
The photovoltaic grid-connected inverter is used for converting direct current into alternating current.
Preferably, the air-source heat pump unit includes: the system comprises a condenser, a compressor, a liquid storage tank, a gas-liquid separator, an expansion valve, an electromagnetic four-way valve and an evaporator; the electromagnetic four-way valve is respectively connected with an air suction port, an air exhaust port of the compressor, an inlet end of the condenser and an outlet end of the evaporator, an exhaust end of the compressor is connected with an inlet end of the condenser, an outlet end of the condenser is connected with one end of the liquid storage tank, the other end of the liquid storage tank is connected with an inlet of the expansion valve, an outlet end of the expansion valve is connected with an inlet end of the evaporator, an outlet end of the evaporator is connected with an inlet of the gas-liquid separator, and an outlet end of the gas-liquid separator is.
Further, the condenser is used for condensing the temperature of the high-temperature liquid or gas to a preset output temperature, and then inputting the cooled liquid into the liquid storage tank;
The compressor is used for receiving the gas transmitted by the gas-liquid separator and converting the gas into high-temperature and high-pressure gas;
The liquid storage tank is used for storing the cooled liquid transmitted by the condenser;
the gas-liquid separator is used for receiving the gas-liquid mixture conveyed by the evaporator and separating gas and liquid in the gas-liquid mixture;
the expansion valve is used for controlling the connection relationship between the liquid storage tank and the evaporator;
The electromagnetic four-way valve is used for changing two working conditions of refrigeration and heating of the compressor;
the evaporator is used for absorbing heat in air and gasifying the heat into a gas-liquid mixture.
preferably, the cooperative operation control system further comprises a water circulation unit connected with the air source heat pump unit and used for sending the heat generated by the air source heat pump to a user.
further, the water circulation unit includes: indoor heating terminal and circulating water pump;
the circulating water pump is connected with a water inlet at the indoor heating tail end, a water outlet at the indoor heating tail end is connected with a water inlet end of a condenser in the air source heat pump unit, and the circulating water pump is connected with a water outlet end of the condenser in the air source heat pump unit.
Further, the control module includes: the temperature control system comprises a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a first pressure sensor, a second pressure sensor and a controller;
the first temperature sensor is arranged between a circulating water pump of the water circulating unit and the tail end of indoor water supply, and the second temperature sensor is arranged between the tail end of indoor heating of the water circulating unit and the condenser; the third temperature sensor is arranged between the condenser and the liquid storage tank of the air source heat pump unit; the fourth temperature sensor is arranged between the liquid storage tank of the air source heat pump unit and the evaporator; the fifth temperature sensor and the first pressure sensor are arranged between the gas-liquid separator and the compressor of the air source heat pump unit; the sixth temperature sensor and the second pressure sensor are arranged between the compressor and the condenser of the air source heat pump unit;
And the controller is respectively connected with a compressor of the air source heat pump unit, an electromagnetic four-way valve of the air source heat pump unit, an expansion valve of the air source heat pump unit and a circulating water pump of the water circulating unit.
Further, the controller is configured to calculate the fuzzy control parameter of the expansion valve by using the values returned by the plurality of pressure sensors and the temperature sensor, and the ambient temperature as inputs.
Further, the fuzzy control parameter of the expansion valve is determined by:
wherein, wia fuzzy variable corresponding to the ambient temperature returned by the temperature sensorifuzzy variable y representing the correspondence of the water temperature returned by the temperature sensor*Is a fuzzy control parameter of the expansion valve,is the center of the ith fuzzy set, and W is the number of fuzzy set centers.
compared with the closest prior art, the invention has the following beneficial effects:
the invention provides an energy collaborative operation control system, comprising: the system comprises a distributed photovoltaic unit, an air source heat pump unit and a control module;
in the aspect of supplying power to an air source heat pump, a distributed power generation system and the air source heat pump are combined together, a distributed photovoltaic unit is in one-way connection with an air source heat pump unit, the air source heat pump unit is in two-way connection with a control module, and the distributed photovoltaic unit is in two-way connection with a power grid; and a traditional single power grid power supply mode is abandoned, the photovoltaic directly supplies power to the air source heat pump, the electricity generated by the photovoltaic is not enough to be obtained from the power grid, and the surplus is on the internet. On one hand, the power supply pressure of the power grid and the local power shortage can be relieved, and the reliability and stability of the power grid are improved; on the other hand, the air source heat pump can relieve the tension of building energy consumption, reduce the utilization of fossil energy and increase the energy utilization rate; meanwhile, the method has a great effect on relieving environmental pollution.
The distributed photovoltaic unit is used for supplying power to the air source heat pump or being connected with a power grid in the peak period of power utilization; in the daytime, namely in the peak period of electricity utilization, the photovoltaic supplies power to the hot air source pump, the heat generated by the heat pump is used for heating in the peak period of electricity utilization, and redundant electric quantity is connected to the grid; in the dark days, namely the power consumption valley period, the power grid supplies power to the heat pump, so that the heating requirement of a user is met, the power in the valley period is fully utilized, the power consumption cost is saved for the user, the peak-valley difference of the power grid is relieved, and the energy is saved. And the air source heat pump unit is used for heating by utilizing the low-level heat source.
the control module is used for controlling the distributed photovoltaic units to supply power to the air source heat pump units according to a predefined control strategy, so that the temperature value is within a predefined temperature range; the predefined control strategy comprises the steps of controlling the distributed photovoltaic units to be connected to the grid, controlling the air source heat pump to be started or stopped and carrying out fuzzy control on the air source heat pump. The indoor temperature of the user can be effectively and timely adjusted through fuzzy control, heating as required is achieved, energy is saved, the phenomenon that heating is insufficient or excessive in the traditional heating mode is avoided, and economic benefits are maximized.
Drawings
Fig. 1 is a schematic structural diagram of a control system for energy cooperative operation provided in an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of an application scenario of the energy source cooperative operation control system provided in the embodiment of the present invention;
the system comprises a solar photovoltaic panel 1, a direct current header box 2, a grid-connected inverter 3, a power grid 4, a compressor 5, a gas-liquid separator 6, an electromagnetic four-way valve 7, an evaporator 8, an expansion valve 9, a liquid storage tank 10, a condenser 11, a circulating water pump 12, an indoor heating tail end 13, a controller 14, a second temperature sensor 15, a first temperature sensor 16, a third temperature sensor 17, a sixth temperature sensor 18, a second pressure sensor 19, a fifth temperature sensor 20, a first pressure sensor 21, a fourth temperature sensor 22 and an ambient temperature sensor 23;
FIG. 3 is a schematic diagram of a triangular membership function for ambient temperature and water temperature provided in an embodiment of the present invention;
FIG. 4 is a diagram of output quantity membership functions provided in an embodiment of the present invention.
Detailed Description
Embodiments of the process of the present invention are described in detail below with reference to the accompanying drawings.
Along with the rapid development of economy and society, urgent needs for power increase and continuously increased needs for heating, cooling and hot water supply cause the phenomena of power supply shortage of power departments, serious fossil energy consumption and serious environmental pollution. Aiming at the phenomena, the invention provides an energy collaborative operation control system, and the distributed photovoltaic power generation and the air source heat pump have very important significance for reducing environmental pollution and utilizing renewable energy.
on one hand, the power supply pressure of the power grid and the local power shortage can be relieved, and the reliability and stability of the power grid are improved; on the other hand, the air source heat pump can relieve the tension of building energy consumption, reduce the utilization of fossil energy and increase the energy utilization rate. Meanwhile, the method has a great effect on relieving environmental pollution.
the system shown in fig. 1, comprising: the system comprises a distributed photovoltaic unit 101, an air source heat pump unit 102 and a control module 104, wherein the distributed photovoltaic unit is connected with the air source heat pump unit in a one-way mode, the air source heat pump unit is connected with the control module in a two-way mode, and the distributed photovoltaic unit is connected with a power grid in a two-way mode; wherein,
The distributed photovoltaic unit 101 is used for supplying power to the air source heat pump or being connected with a power grid in the peak period of power utilization;
The air source heat pump unit 102 is used for heating by utilizing heat energy of a low-level heat source;
a water circulation unit 103 for sending heat generated by the air source heat pump to a user;
The control module 104 is configured to control the distributed photovoltaic units to supply power to the air source heat pump unit according to a predefined control strategy, so that a temperature value is within a predefined temperature range; the predefined control strategy comprises the steps of controlling the distributed photovoltaic units to be connected to the grid, controlling the air source heat pump to be started or stopped and carrying out fuzzy control on the air source heat pump. Specifically, the distributed photovoltaic units are controlled to supply power to the air source heat pump units in the daytime (or under the bright condition), and if the heat (or cold) generated by the air source heat pump is larger than the user demand, the distributed photovoltaic units are controlled to be connected to the grid, and the air source heat pump stops working. Meanwhile, the electricity selling price and the electricity purchasing price of the power grid are considered when the photovoltaic power generation supplies power to the air source heat pump, when the electricity purchasing price of the photovoltaic power grid is more than the electricity selling price at a certain time, the photovoltaic power generation is controlled to be completely connected to the Internet, and the power consumption of the heat pump is supplied by the power grid; when the electricity purchasing price of the photovoltaic power grid is less than the electricity selling price at a certain time, the photovoltaic power generation is controlled to directly supply power to the air source heat pump, and when the photovoltaic power generation is surplus, the Internet is accessed. And when the electricity price is low, the power grid is controlled to supply power to the air source heat pump, so that the economic benefit is maximized.
In addition, the system for controlling the coordinated operation of the energy sources further comprises a water circulation unit 103 connected with the air source heat pump unit and used for sending the heat generated by the air source heat pump to a user.
As shown in fig. 2, the distributed photovoltaic unit 101 includes: the solar photovoltaic grid-connected inverter comprises a solar photovoltaic panel 1, a direct current header box 2, a photovoltaic grid-connected inverter 3 and a power grid 4. The solar photovoltaic panel 1 is connected with the direct current combiner box 2, the direct current combiner box 2 is connected with the photovoltaic grid-connected inverter 3, the photovoltaic grid-connected inverter 3 is connected with the air source heat pump unit 102, and the photovoltaic grid-connected inverter 3 is connected with the power grid 4 for grid connection.
the solar photovoltaic panel 1 is used for generating direct current; the direct current combiner box 2 is used for connecting a plurality of photovoltaic matrixes in parallel to carry out combiner; the photovoltaic grid-connected inverter 3 is used for converting direct current into alternating current;
For example, the distributed photovoltaic unit 101 converts solar energy into electric energy through the solar photovoltaic panel 1, the direct current converted by photovoltaic flows through the direct current combiner box 2, and the direct current combiner box 2 is provided with a photovoltaic special direct current lightning protection module, a direct current fuse, a circuit breaker and the like, so that a user can conveniently and accurately master the working condition of the photovoltaic cell in time; the direct current passing through the direct current header box 2 is converted into alternating current capable of being connected to the grid after passing through the grid-connected inverter 3, and the generated electric energy can be connected to the grid or can supply power to the compressor; the distributed photovoltaic unit is characterized in that when the photovoltaic power generation device normally generates power, the power generated by photovoltaic power generation at a certain period is firstly compared with the electricity purchasing price and the electricity selling price of a power grid, if the electricity purchasing price is smaller than the electricity selling price, the power is preferentially used by a compressor, if the electricity purchasing price is larger than the electricity selling price, all photovoltaic power generation is connected to the grid, the power grid is used for supplying power to the compressor, when the photovoltaic power generation point cannot meet the normal operation of the compressor, the power grid and the photovoltaic power supply together or the power grid supplies power, redundant electric quantity can also be sold to the power grid, and therefore the purposes of saving energy and being economical and optimal are achieved.
the air-source heat pump unit 102, as shown in fig. 2, includes: a condenser 11, a compressor 5, a liquid storage tank 10, a gas-liquid separator 6, an expansion valve 9, an electromagnetic four-way valve 7 and an evaporator 8; the electromagnetic four-way valve 7 is respectively connected with an air suction port and an air exhaust port of the compressor 5, an inlet end of the condenser 11 and an outlet end of the evaporator, an exhaust end of the compressor 5 is connected with an inlet end of the condenser 11, an outlet end of the condenser 11 is connected with one end of the liquid storage tank 10, the other end of the liquid storage tank 10 is connected with an inlet of the expansion valve 9, an outlet end of the expansion valve 9 is connected with an inlet end of the evaporator 8, an outlet end of the evaporator 8 is connected with an inlet of the gas-liquid separator 6, and an outlet end of the gas-liquid separator 6 is.
The condenser 11 is used for condensing the temperature of the high-temperature liquid or gas to a set output temperature, and then inputting the cooled liquid to the liquid storage tank 10; the compressor 5 is used for receiving the gas transmitted by the gas-liquid separator 6 and converting the gas into high-temperature and high-pressure gas; a liquid storage tank 10 for storing the cooled liquid delivered by the condenser 11; a gas-liquid separator 6 for receiving the gas-liquid mixture delivered from the evaporator 8 and separating gas and liquid in the gas-liquid mixture; the expansion valve 9 is used for controlling the connection relationship between the liquid storage tank 10 and the evaporator 8; the electromagnetic four-way valve 7 is used for changing two working conditions of refrigeration and heating of the compressor 5; the evaporator 8 is used for absorbing heat in the air and gasifying the heat into a gas-liquid mixture.
For example, the air source heat pump unit 102 sends a control command through a communication line, the compressor 5 and the expansion valve 9 are opened, when liquid losing a certain amount of heat in the condenser 11 reaches the liquid storage tank 10, the liquid passes through the expansion valve 9 to become low-temperature low-pressure wet steam, the low-temperature low-pressure wet steam absorbs heat in air through the evaporator 8 and is gasified, the gasified gas separates a gas-liquid mixture from the evaporator 8 through the gas-liquid separator 6, the separated gas passes through the compressor 5 to become high-temperature high-pressure gas, and energy exchange is performed on circulating water through the condenser 11, the air source heat pump uses heat energy of a low-level heat source to perform heating, the energy absorbed from the evaporator 8 and energy converted by work consumed by the compressor 5 are taken away in a cooling medium in the condenser 11, and the heating purpose is achieved; when refrigeration is needed, the electromagnetic four-way valve 7 is opened, and the exhaust end and the suction port of the compressor 5 are reversely connected with the inlet end of the condenser 11 and the outlet end of the gas-liquid separator, so that the refrigeration effect is achieved.
The water circulation unit 103, as shown in fig. 2, includes: a circulating water pump 12 and an indoor heating terminal 13; the circulating water pump 12 is connected with a water inlet of an indoor heating terminal 13, a water outlet of the indoor heating terminal 13 is connected with a water inlet end of the condenser 11 in the air source heat pump unit 102, and the circulating water pump 12 is connected with a water outlet end of the condenser 11 in the air source heat pump unit 102.
Wherein, send out control command through the communication line, open circulating water pump 12 circulating water and flow in the hydrologic cycle circuit, at condenser department 11, the circulating water that reduces the heat absorbs the heat that air source heat pump unit 102 produced, flows to indoor heating terminal 13, and indoor heating terminal 13 absorbs the heat through the low temperature circulating water rivers of heat exchange to condenser 11 in air source heat pump unit 102, absorbs the heat again.
The control module 104 includes:
The detection unit is used for detecting a time range and judging the peak-valley time period of the power consumption;
The acquiring unit is used for acquiring the electricity selling price and the electricity purchasing price of the power grid when the photovoltaic power generation supplies power to the air source heat pump;
a pre-defining unit for defining an average value of the indoor temperature as a temperature threshold; the indoor temperature is acquired by temperature sensors, and the temperature sensors are multiple and are arranged in different houses;
the comparison unit is used for comparing the heat/cold quantity generated by the air source heat pump with the predefined temperature threshold value;
The selecting unit is used for selecting the power supply end of the air source heat pump according to the acquired information of the acquiring unit;
And the management unit is used for managing the air source heat pump according to the detection result obtained by the detection unit and the comparison information obtained by the execution comparison unit.
wherein, select the unit and include:
The first execution subunit is used for controlling all photovoltaic power generation to be on line when the electricity purchasing price of the photovoltaic power grid in the current time period is greater than the electricity selling price, and the electricity used by the air source heat pump is supplied by the power grid;
and the second execution subunit is used for controlling the photovoltaic power generation to directly supply power to the air source heat pump when the electricity purchase price of the photovoltaic power grid in the current time period is less than the electricity sale price, and surfing the internet when the photovoltaic power generation is surplus.
a management unit comprising:
the third execution subunit is used for controlling the distributed photovoltaic unit to be connected to the grid or enabling the air source heat pump to stop working if the heat/cold quantity sent by the air source heat pump is larger than a temperature threshold value in the peak period of power utilization;
and the fourth execution subunit is used for performing fuzzy control on the air source heat pump in the electricity utilization valley period if the heat/cold quantity sent by the air source heat pump is greater than a predefined temperature threshold value.
in addition, the control module 104 further includes a first temperature sensor 16, a second temperature sensor 15, a third temperature sensor 17, a fourth temperature sensor 22, a fifth temperature sensor 20, a sixth temperature sensor 18, a first pressure sensor 21, a second pressure sensor 19, an ambient temperature sensor 23, and the controller 14 as shown in fig. 2;
The first temperature sensor 16 is installed between the circulating water pump 12 of the water circulating unit 103 and the indoor water supply end 13, and the second temperature sensor 15 is installed between the indoor heating end 13 of the water circulating unit 103 and the condenser 11; the third temperature sensor 17 is arranged between the condenser 11 and the liquid storage tank 10 of the air source heat pump unit 102; the fourth temperature sensor 22 is arranged between the liquid storage tank 10 of the air source heat pump unit 102 and the evaporator 8; the fifth temperature sensor 20 and the first pressure sensor 21 are installed between the gas-liquid separator 6 and the compressor 5 of the air source heat pump unit 102; the sixth temperature sensor 48 and the second pressure sensor 49 are installed between the compressor 5 and the condenser 11 of the air-source heat pump unit 102.
the control module is used for regulating and controlling the output pulse quantity of the electronic expansion valve when the unit operates according to the acquired temperature of the 6 temperature sensors, the pressure of the 2 pressure sensors and the ambient temperature as the input conditions of the controller, and controlling the flow of the working medium according to different opening degrees of the electronic expansion valve to achieve the effect of controlling the temperature.
for example, when the indoor heating terminal 13 needs heating, the controller 14 sends a control command through the communication line: the circulating water pump 12, the compressor 5 and the expansion valve 9 are started, the compressor 5 starts to work, the solar photovoltaic panel 1 generates electricity in the daytime in the environment with illumination, the compressor 5 is powered by electricity generated by the solar photovoltaic panel 1 or electricity generated by the power grid 4 according to different electricity purchasing and selling prices of the power grid, when the compressor 5 is powered by electricity generated by the solar photovoltaic panel 1, electricity is sold to the power grid under the condition of redundant electric quantity, and the compressor 5 is powered by the power grid 4 at night or in the daytime in the condition without illumination; meanwhile, the temperature sensor collects the outdoor and working medium temperatures, and the expansion valve 9 is adjusted according to the controller 14, so that the temperature is in a normal level. When the ambient temperature is high and the heat pump is not needed for heating, the controller 14 sends a command for closing the compressor 5, the circulating water pump 12 and the expansion valve 9 or opens the electromagnetic four-way valve 7 through the communication line, and the heat pump operates in a cooling state.
Further, fuzzy control is a known prior art, and is applied to the embodiment provided by the present invention, and the control principle is as follows:
Step 1: the input parameters and the output parameters are fuzzified. The working environment temperature range of the air source heat pump water heater is usually between-10 ℃ and 40 ℃ and is limited by conditions such as a compressor, the target water temperature is generally set to be 55 ℃, and fig. 3 is a triangular membership function of the environment temperature and the water temperature, wherein the environment temperature and the water temperature are divided into 11 grades, and each grade corresponds to a fuzzy variable and a membership function. Fuzzy variables for water temperature and ambient temperature are denoted as TwiAnd Taiwhere i is 1,2 … 11, the blurring process for the precise input is completed. Similarly, the output quantity is converted into a fuzzy set according to the impulse response characteristics of the electronic expansion valve under different opening degrees, and the output quantity membership function is shown in fig. 4.
step 2: a method for making a fuzzy rule table and resolving fuzzy. Experiments show that the higher the ambient temperature is, the larger the ideal initial opening of the valve should be, and the higher the water temperature is, the smaller the ideal initial opening of the valve should be, and simultaneously, the ideal initial opening of the valve is foundThe influence of water temperature on the water-cooling type water heater is relatively small mainly depending on the ambient temperature, and when the ambient temperature is in a certain middle area, the ideal initial opening degree of the valve is obviously changed along with the ambient temperature; for the pulse quantity, when the ambient temperature is higher, the pulse quantity is larger, and when the water temperature is higher, the pulse quantity is smaller. According to the above experience, if-then expression statements are adopted to summarize the following reasoning rules: if TwIs Twi，TaIs TaiThe initial opening of the then valve is fmThe pulse output is un。
and step 3: and (4) a deblurring algorithm. The fuzzy solving algorithm has a plurality of methods, the simplest method is the maximum membership method, but the method does not consider other values with smaller membership; the gravity center method is used for calculating the gravity center of the whole sampling point to obtain the output quantity, and has higher precision, but the method is more complex in calculation and has high calculation requirement; the center average deblurring method is a weighted average of the centers of M fuzzy sets, the weight of the center average deblurring method is equal to the height of the corresponding fuzzy set, and because the center average deblurring method is simple and convenient to calculate and has higher precision, the center average deblurring method is adopted as a deblurring criterion in the text, and the formula is as follows:
wherein y is*in order to output the value of the output,Is the center of the ith fuzzy set, wiis the corresponding weight coefficient.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
these computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims appended hereto.
Claims (13)
1. an energy source collaborative operation control system, the system comprising: the system comprises a distributed photovoltaic unit, an air source heat pump unit and a control module; the distributed photovoltaic unit is in one-way connection with the air source heat pump unit, the air source heat pump unit is in two-way connection with the control module, and the distributed photovoltaic unit is in two-way connection with the power grid; wherein,
the distributed photovoltaic unit is used for supplying power to the air source heat pump or being connected with a power grid in the peak period of power utilization;
the air source heat pump unit is used for heating by utilizing heat energy of a low-level heat source;
The control module is used for controlling the distributed photovoltaic units to supply power to the air source heat pump units according to a predefined control strategy, so that the temperature value is within a predefined temperature range;
the predefined control strategy comprises the steps of controlling the distributed photovoltaic units to be connected to the grid, controlling the air source heat pump to be started or stopped and carrying out fuzzy control on the air source heat pump.
2. The system of claim 1, wherein the control module comprises:
the detection unit is used for detecting a time range and judging the peak-valley time period of the power consumption;
The acquiring unit is used for acquiring the electricity selling price and the electricity purchasing price of the power grid when the photovoltaic power generation supplies power to the air source heat pump;
a pre-defining unit for defining an average value of the indoor temperature as a temperature threshold; the indoor temperature is acquired by temperature sensors, and the temperature sensors are multiple and are arranged in different houses;
the comparison unit is used for comparing the heat/cold quantity generated by the air source heat pump with the predefined temperature threshold value;
the selecting unit is used for selecting the power supply end of the air source heat pump according to the acquired information of the acquiring unit;
And the management unit is used for managing the air source heat pump according to the detection result obtained by the detection unit and the comparison information obtained by the execution comparison unit.
3. The system of claim 2, wherein the selecting unit comprises:
The first execution subunit is used for controlling all photovoltaic power generation to be on line when the electricity purchasing price of the photovoltaic power grid in the current time period is greater than the electricity selling price, and the electricity used by the air source heat pump is supplied by the power grid;
and the second execution subunit is used for controlling the photovoltaic power generation to directly supply power to the air source heat pump when the electricity purchase price of the photovoltaic power grid in the current time period is less than the electricity sale price, and surfing the internet when the photovoltaic power generation is surplus.
4. The system of claim 2, wherein the management unit comprises:
the third execution subunit is used for controlling the distributed photovoltaic unit to be connected to the grid or enabling the air source heat pump to stop working if the heat/cold quantity sent by the air source heat pump is larger than a temperature threshold value in the peak period of power utilization;
and the fourth execution subunit is used for performing fuzzy control on the air source heat pump in the electricity utilization valley period if the heat/cold quantity sent by the air source heat pump is greater than a predefined temperature threshold value.
5. The system of claim 1, wherein the distributed photovoltaic unit comprises: the system comprises a solar photovoltaic panel and a direct current combiner box photovoltaic grid-connected inverter;
the solar photovoltaic panel is connected with the direct current header box, the direct current header box is connected with the photovoltaic grid-connected inverter, one end of the photovoltaic grid-connected inverter is connected with the air source heat pump unit, and the other end of the photovoltaic grid-connected inverter is connected with the power grid for grid connection.
6. the system of claim 5, wherein the solar photovoltaic panel is configured to generate direct current;
the direct current combiner box is used for being connected into a plurality of photovoltaic matrixes in parallel to carry out combiner;
The photovoltaic grid-connected inverter is used for converting direct current into alternating current.
7. the system of claim 1, wherein the air source heat pump unit comprises: the system comprises a condenser, a compressor, a liquid storage tank, a gas-liquid separator, an expansion valve, an electromagnetic four-way valve and an evaporator; the electromagnetic four-way valve is respectively connected with an air suction port, an air exhaust port of the compressor, an inlet end of the condenser and an outlet end of the evaporator, an exhaust end of the compressor is connected with an inlet end of the condenser, an outlet end of the condenser is connected with one end of the liquid storage tank, the other end of the liquid storage tank is connected with an inlet of the expansion valve, an outlet end of the expansion valve is connected with an inlet end of the evaporator, an outlet end of the evaporator is connected with an inlet of the gas-liquid separator, and an outlet end of the gas-liquid separator is.
8. the system of claim 7, wherein the condenser is configured to condense the temperature of the high temperature liquid or gas to a predetermined output temperature, and then input the cooled liquid to the liquid storage tank;
the compressor is used for receiving the gas transmitted by the gas-liquid separator and converting the gas into high-temperature and high-pressure gas;
the liquid storage tank is used for storing the cooled liquid transmitted by the condenser;
The gas-liquid separator is used for receiving the gas-liquid mixture conveyed by the evaporator and separating gas and liquid in the gas-liquid mixture;
The expansion valve is used for controlling the connection relationship between the liquid storage tank and the evaporator;
The electromagnetic four-way valve is used for changing two working conditions of refrigeration and heating of the compressor;
The evaporator is used for absorbing heat in air and gasifying the heat into a gas-liquid mixture.
9. The system of claim 1, wherein the co-operating control system further comprises a water circulation unit coupled to the air source heat pump unit for sending heat generated by the air source heat pump to a user.
10. the system of claim 9, wherein the water circulation unit comprises: indoor heating terminal and circulating water pump;
The circulating water pump is connected with a water inlet at the indoor heating tail end, a water outlet at the indoor heating tail end is connected with a water inlet end of a condenser in the air source heat pump unit, and the circulating water pump is connected with a water outlet end of the condenser in the air source heat pump unit.
11. The system of claim 9, wherein the control module comprises: the temperature control system comprises a first temperature sensor, a second temperature sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a sixth temperature sensor, a first pressure sensor, a second pressure sensor and a controller;
the first temperature sensor is arranged between a circulating water pump of the water circulating unit and the tail end of indoor water supply, and the second temperature sensor is arranged between the tail end of indoor heating of the water circulating unit and the condenser; the third temperature sensor is arranged between the condenser and the liquid storage tank of the air source heat pump unit; the fourth temperature sensor is arranged between the liquid storage tank of the air source heat pump unit and the evaporator; the fifth temperature sensor and the first pressure sensor are arranged between the gas-liquid separator and the compressor of the air source heat pump unit; the sixth temperature sensor and the second pressure sensor are arranged between the compressor and the condenser of the air source heat pump unit;
and the controller is respectively connected with a compressor of the air source heat pump unit, an electromagnetic four-way valve of the air source heat pump unit, an expansion valve of the air source heat pump unit and a circulating water pump of the water circulating unit.
12. the system of claim 11, wherein the controller is configured to calculate fuzzy control parameters for the expansion valve using values returned by the plurality of pressure sensors and temperature sensors, and the ambient temperature as inputs.
13. the system of claim 12, wherein the fuzzy control parameter for the expansion valve is determined by:
wherein, wiA fuzzy variable corresponding to the ambient temperature returned by the temperature sensorifuzzy variable y representing the correspondence of the water temperature returned by the temperature sensor*is a fuzzy control parameter of the expansion valve,is the center of the ith fuzzy set, and W is the number of fuzzy set centers.
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