CN113028643B - Novel solar water heating system and energy management method - Google Patents
Novel solar water heating system and energy management method Download PDFInfo
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- CN113028643B CN113028643B CN202110450811.1A CN202110450811A CN113028643B CN 113028643 B CN113028643 B CN 113028643B CN 202110450811 A CN202110450811 A CN 202110450811A CN 113028643 B CN113028643 B CN 113028643B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 171
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 238000007726 management method Methods 0.000 title claims abstract description 16
- 238000004146 energy storage Methods 0.000 claims abstract description 110
- 238000005338 heat storage Methods 0.000 claims abstract description 62
- 238000006243 chemical reaction Methods 0.000 claims abstract description 61
- 238000012544 monitoring process Methods 0.000 claims abstract description 36
- 238000005485 electric heating Methods 0.000 claims abstract description 25
- 238000007599 discharging Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 210000004027 cell Anatomy 0.000 abstract description 40
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 230000008014 freezing Effects 0.000 abstract description 4
- 238000007710 freezing Methods 0.000 abstract description 4
- 210000003850 cellular structure Anatomy 0.000 abstract description 2
- 230000009172 bursting Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/18—Water-storage heaters
- F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
- F24H1/201—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes using electric energy supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
- F24H9/2021—Storage heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
- F24S50/40—Arrangements for controlling solar heat collectors responsive to temperature
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/44—Heat exchange systems
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention belongs to the technical field of comprehensive utilization of new energy, and discloses a novel solar water heating system and an energy management method, wherein the system comprises a control system, a photovoltaic cell assembly, an energy storage battery, an electric heating conversion device and a heat storage water tank; the output end of the photovoltaic battery assembly is connected with the input end of the control system, the output end of the control system is respectively connected with the input ends of the energy storage battery and the electric heating conversion device, the electric heating conversion device is arranged in the heat storage water tank, the control system comprises a controller and a data monitoring system for monitoring the output voltage of the photovoltaic battery assembly, the state of the energy storage battery and the water temperature and water level in the heat storage water tank, and the controller controls the running states of the energy storage battery and the electric heating conversion device according to the data monitored by the data monitoring system. The invention solves the problem that the water temperature of the traditional solar water heater is uncontrollable, and the photovoltaic cell component is used for replacing the traditional heat collector, so that a water pipeline is not required to be arranged outdoors, and the problem of freezing and blocking of the pipeline can be avoided.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of new energy, in particular to a novel solar water heating system and an energy management method.
Background
The solar water heater has low price and convenient use, and is widely used by families in most areas of China. The solar energy water heater can utilize solar energy to provide hot water for people for life and shower, and save a large amount of electric energy and fossil energy for people.
The existing solar water heater comprises a vacuum tube heat collector or/and a flat plate heat collector, a heat storage water tank, a connecting pipeline and other parts. However, the water temperature in the heat storage water tank of the existing solar water heater is uncontrollable, so that the problem that hot water in the heat storage water tank boils and overflows when the heat is rich can occur; when the heat is insufficient, the problem that the outdoor water pipe is frozen and blocked, even bursts and cannot be normally used can occur, and especially in extremely cold areas, such as northeast areas, inner mongolia, tibet areas and the like in China, the problem of pipeline freezing and blocking greatly limits the popularization and the use of the solar water heater.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention discloses a novel solar water heating system and an energy management method, which can avoid the problems of over-charge and over-discharge of an energy storage battery and over-high water temperature in a heat storage water tank and realize the purpose of controllable water temperature in the heat storage water tank.
Specifically, the method is realized mainly by the following technical scheme:
in a first aspect, a novel solar water heating system is provided, comprising:
A control system;
at least one group of photovoltaic cell assemblies;
An energy storage battery for storing electrical energy;
an electrothermal conversion device for converting electric energy into thermal energy;
a heat storage tank for storing hot water;
The output end of the photovoltaic cell assembly is connected with the input end of the control system, the output end of the control system is respectively connected with the energy storage battery and the input end of the electric heat conversion device, the electric heat conversion device is arranged in the heat storage water tank, the heat storage water tank is provided with a cold water inlet and a hot water outlet, the control system comprises a controller and a data monitoring system for monitoring the output power of the photovoltaic cell assembly, the state of the energy storage battery and the water temperature and water level in the heat storage water tank, and the controller controls the operation states of the energy storage battery and the electric heat conversion device according to the data monitored by the data monitoring system.
Preferably, the electrothermal conversion device may adopt a direct-current electrothermal conversion device or an alternating-current electrothermal conversion device.
Preferably, the output end of the control system is connected with the direct-current electric heating conversion device through a DC/DC converter; or the output end of the control system is connected with the alternating current electric heating conversion device through an inverter.
Preferably, the output end of the photovoltaic cell assembly is further provided with a first voltage sensor and a first current sensor, the output end of the photovoltaic cell assembly is respectively connected with the input ends of the first voltage sensor and the first current sensor, the output ends of the first voltage sensor and the first current sensor are respectively connected with the input end of the data monitoring system, and the data monitoring system monitors the output power of the photovoltaic cell assembly by receiving the output voltage and the output current of the photovoltaic cell assembly fed back by the first voltage sensor and the first current sensor.
Preferably, the system further comprises a second voltage sensor and a second current sensor which are connected with the energy storage battery, wherein the input ends of the second voltage sensor and the second current sensor are connected with the energy storage battery, the output end of the second voltage sensor and the input end of the second current sensor are connected with the input end of the data monitoring system, and the data monitoring system monitors the state of the energy storage battery by receiving the output voltage and the output current of the energy storage battery fed back by the second voltage sensor and the second current sensor.
Preferably, a water level sensor and a temperature sensor are arranged in the heat storage water tank, the water level sensor and the temperature sensor are respectively connected with the data monitoring system, and the data monitoring system monitors water level and water temperature data in the heat storage water tank by using the water level sensor and the temperature sensor.
In a second aspect, an energy management method of a novel solar water heating system is provided, which is applied to the novel solar water heating system as described in any one of the above, and specifically includes:
Step 1: the data monitoring system monitors the output power P 1 of the photovoltaic cell assembly, the SOC value of the energy storage battery, the water level Z and the water temperature T of the heat storage water tank and the rated power P of the electrothermal conversion device, and sends the monitored data to the controller;
step 2: the controller judges the size between the rated power P of the electrothermal conversion device and the output power P 1 of the photovoltaic battery component;
If P is less than or equal to P 1, controlling a power supply switch, a charging switch and a discharging switch of the energy storage battery of the photovoltaic battery assembly to be in a closed state, and turning to the step 3;
If P is more than P 1, controlling a discharging switch of the energy storage battery and a power supply switch of the photovoltaic battery assembly to be in a closed state, and turning to the step 3;
Step 3: judging the size between the residual capacity SOC value of the energy storage battery and the minimum discharge residual capacity threshold value SOC min of the energy storage battery;
If the SOC is less than or equal to the SOC min, controlling a charging switch of the photovoltaic battery assembly to be in a closed state, and turning to the step 4;
If SOC is larger than SOC min, go to step 5;
Step 4: controlling a discharge switch of the energy storage battery and a power supply switch of the photovoltaic battery assembly to be in an off state, and turning to the step 7;
Step 5: judging the size between the water level Z of the heat storage water tank and the lowest water level Z min;
If Z is not more than Z min, turning to the step 4;
If Z is larger than Z min, turning to the step 6;
step 6: judging the size between the water temperature T of the heat storage water tank and a water temperature threshold T max set by the heat storage water tank;
if T is more than or equal to T max, turning to step 4;
If T is less than T max, turning to the step 7;
step 7: judging the size between the SOC of the energy storage battery and the maximum charge remaining capacity threshold SOC max of the energy storage battery;
if the SOC is more than or equal to SOC max, controlling a charging switch of the photovoltaic battery assembly to be in an off state;
If SOC is less than SOC max, returning to step 2.
Compared with the prior art, the invention has the following beneficial effects:
The novel energy management system of the solar water heating system takes the control system as the core, uniformly and intensively controls the photovoltaic cell assembly, the energy storage battery, the electric heating conversion device and the heat storage water tank, monitors the output power of the photovoltaic cell assembly, the state of the energy storage battery and the water temperature and water level data of the heat storage water tank in real time, controls the working states of the energy storage battery and the electric heating conversion device according to the monitored data, avoids the problems of over-charge and over-discharge of the energy storage battery and overhigh water temperature in the heat storage water tank, solves the problem of freezing and blocking or even bursting of a pipeline in winter, and simultaneously uses the photovoltaic assembly to replace the traditional vacuum tube heat collector, so that the equipment reliability is obviously improved, the installation is simpler and more convenient, the service life is greatly prolonged, and the equipment is safer and more reliable to operate.
Drawings
1. FIG. 1 is a schematic structural diagram of a novel solar water heating system according to an embodiment of the present invention;
2. Fig. 2 is a schematic flow chart of an energy management method of a novel solar water heating system according to an embodiment of the present invention.
Detailed Description
In order to more clearly understand the core idea of the present invention, a detailed description will be given below with reference to the accompanying drawings.
The invention provides a novel solar water heating system, which is shown in fig. 1, and particularly comprises a control system, at least one group of photovoltaic cell assemblies, an energy storage battery for storing electric energy, an electric heating conversion device for converting the electric energy into heat energy and a heat storage water tank for storing hot water, wherein the photovoltaic cell assemblies, the energy storage battery, the electric heating conversion device and the heat storage water tank are all connected with the control system.
Specifically, the output of photovoltaic cell subassembly with control system's input is connected, control system's output is connected respectively energy storage battery reaches electrothermal conversion device's input, electrothermal conversion device sets up in the heat storage water tank, the heat storage water tank is equipped with cold water import and hot water export, control system includes the controller and is used for monitoring photovoltaic cell subassembly output, energy storage battery state and the data monitoring system of heat storage water tank internal water temperature and water level, the controller is according to data control that data monitoring system monitored energy storage battery with electrothermal conversion device's running state, the transmission of control electric energy is realized to the on-off state that each circuit set up of controller accessible control, for example control photovoltaic cell subassembly's charge switch and the state of discharging switch, the state of discharging switch of energy storage battery.
It should be noted that, in fig. 1, the photovoltaic cell assembly only shows two groups of examples, the photovoltaic cell assembly may be formed by using silicon solar cells with monocrystalline silicon as a substrate, and rated output power and output voltage of each group of photovoltaic cell assembly are determined according to actual application scenarios, so as to determine the number of solar cells forming the photovoltaic cell assembly and the array of the photovoltaic cell assembly. The photovoltaic cell assembly is used for directly converting solar energy into electric energy, and is connected with the control system, and the control system reasonably distributes the generated electric energy. The electric heating conversion device is arranged in the heat storage water tank and is used for converting electric energy into heat energy, and the electric heating device which is designed according to the heat effect principle of current (namely a phenomenon that the temperature of a conductor rises when the current passes through various conductors) can be adopted to convert the electric energy into heat energy; the electrothermal conversion device stores the converted heat energy in the heat storage water tank for generating constant-temperature hot water. The energy storage battery is connected with the control system, the control system monitors the residual capacity value SOC of the energy storage battery in real time, and controls the charge and discharge states of the energy storage battery according to the monitored SOC value.
According to the invention, the output power of the photovoltaic battery assembly, the state of the energy storage battery and the water temperature and water level in the heat storage water tank are monitored in real time through the data monitoring system, the controller controls the operation states of the energy storage battery and the electric heating conversion device according to the monitored data, so that the problems of over-charging and over-discharging of the energy storage battery and over-high water temperature in the heat storage water tank can be avoided, the problem of freezing and blocking or even bursting of a pipeline in winter is solved, meanwhile, the photovoltaic assembly is used for replacing the traditional vacuum tube heat collector, the reliability of the device is obviously improved, the installation is simpler and more convenient, the service life is greatly prolonged, and the operation of the device is safer and more reliable.
In a preferred embodiment, the electrothermal conversion device may employ a dc electrothermal conversion device or an ac electrothermal conversion device.
In a preferred embodiment, the output end of the control system is connected with the direct-current electric heating conversion device through a DC/DC converter; or the output end of the control system is connected with the alternating current electric heating conversion device through an inverter.
In a preferred embodiment, the output end of the photovoltaic cell assembly is further provided with a first voltage sensor and a first current sensor, the output end of the photovoltaic cell assembly is respectively connected with the input ends of the first voltage sensor and the first current sensor, the output ends of the first voltage sensor and the first current sensor are respectively connected with the input end of the data monitoring system, and the data monitoring system monitors the output power of the photovoltaic cell assembly by receiving the output voltage and the output current of the photovoltaic cell assembly fed back by the first voltage sensor and the first current sensor.
In a preferred embodiment, the system further comprises a second voltage sensor and a second current sensor which are connected with the energy storage battery, wherein the input ends of the second voltage sensor and the second current sensor are connected with the energy storage battery, the output ends of the second voltage sensor and the second current sensor are connected with the input end of the data monitoring system, and the data monitoring system monitors the state of the energy storage battery by receiving the output voltage and the output current of the energy storage battery fed back by the second voltage sensor and the second current sensor.
In a preferred embodiment, a water level sensor and a temperature sensor are arranged in the heat storage water tank, the water level sensor and the temperature sensor are respectively connected with the data monitoring system, and the data monitoring system monitors water level and water temperature data in the heat storage water tank by using the water level sensor and the temperature sensor.
Specifically, the operation principle of the novel solar water heating system is as follows:
The data monitoring system monitors the output power P 1 of the photovoltaic cell assembly according to the output voltage and the output current of the photovoltaic cell assembly fed back by the first voltage sensor and the first current sensor, monitors the SOC value of the energy storage battery according to the output voltage and the output current of the energy storage battery fed back by the second voltage sensor and the second current sensor, and monitors the water level Z and the water temperature data T in the heat storage water tank according to the data fed back by the water level sensor and the temperature sensor. The data monitoring system sends the monitored data to the controller, and the controller firstly judges the size between the rated power P of the electrothermal conversion device and the output power P 1 of the photovoltaic cell component; if P is less than or equal to P 1, the power supply switch of the photovoltaic cell assembly is controlled to be in a closed state, at the moment, the photovoltaic cell assembly directly supplies power to the electric heat conversion device, the electric heat conversion device normally operates to convert electric energy into heat energy, water in the heat storage water tank is heated to enable the water temperature to rise, and meanwhile, the controller controls the charging switch of the photovoltaic cell assembly and the discharging switch of the energy storage battery to be in a closed state, so that redundant electric energy of the photovoltaic cell assembly can be charged to the energy storage battery, or when the power supply of the photovoltaic cell assembly is insufficient, the energy storage battery supplies power to the electric heat conversion device. If P is more than P 1, the discharging switch of the energy storage battery and the power supply switch of the photovoltaic battery assembly are controlled to be in a closed state, at the moment, the photovoltaic battery assembly supplies power to the electric heat conversion device, the energy storage battery supplies power to the electric heat conversion device for a short time, the electric heat conversion device operates normally, and water in the heat storage water tank is heated, so that the water temperature rises. And no matter what the result of judging the size between the rated power P of the electrothermal conversion device and the output power P 1 of the photovoltaic battery assembly, the next program execution is further carried out, namely the specific situation of the residual capacity of the energy storage battery is further judged.
Further judging the residual capacity SOC value (State ofcharge, namely the state of charge, used for reflecting the residual capacity of the battery, and defined as the ratio of the residual capacity to the battery capacity in terms of numerical value, and commonly expressed as a percentage, wherein the value range is 0-1, and the value range is used for indicating that the battery is completely discharged when SOC=0 and the value range is used for indicating that the battery is completely full when SOC=1) of the energy storage battery and the minimum discharge residual capacity threshold value SOC min of the energy storage battery so as to avoid overdischarge; if the SOC is less than or equal to the SOC min, the state that the residual capacity SOC value of the energy storage battery is too low at the moment is indicated, in order to prevent overdischarge, a discharging switch of the energy storage battery and a power supply switch of the photovoltaic battery assembly are required to be controlled to be in an off state, and a charging switch of the photovoltaic battery assembly is required to be controlled to be in a closed state, at the moment, the energy storage battery and the photovoltaic battery assembly stop supplying power to the electric heating replacing device, and the energy storage battery is only in a charging state at the moment. If the SOC is less than or equal to SOC min, it is necessary to further determine the size between the energy storage battery SOC and the energy storage battery maximum charge remaining capacity threshold SOC max.
If the SOC is larger than SOC min, the residual capacity SOC value of the energy storage battery is enough, at the moment, the energy storage battery supplies power to the electrothermal conversion device, the electrothermal conversion device operates normally, water in the heat storage water tank is heated, the water temperature is increased, and the size between the water level Z of the heat storage water tank and the lowest water level Z min is further judged; if Z is less than or equal to Z min, which means that the water level in the heat storage water tank is too low at this time, if continuous heating is continued and the water temperature tends to be too high, the discharging switch of the energy storage battery and the power supply switch of the photovoltaic module are controlled to be in an off state, and power supply to the electric heat conversion device is stopped, and if Z is less than or equal to Z min, the size between the energy storage battery SOC and the maximum charge residual capacity threshold value SOC max of the energy storage battery needs to be further judged.
If Z > Z min, it indicates that the water level in the heat storage tank is sufficient, but if the heating is continued, the water temperature may be too high, so that it is necessary to further determine the size between the water temperature T of the heat storage tank and the water temperature threshold T max set by the heat storage tank at this time to prevent the water temperature from overheating, if T is greater than or equal to T max, that is, the water temperature in the heat storage tank is overheated, the discharging switch of the energy storage battery and the power supply switch of the photovoltaic module are controlled to be in an off state, power supply to the electrothermal conversion device is stopped, and it is necessary to further determine the size between the energy storage battery SOC and the maximum charge remaining capacity threshold SOC max of the energy storage battery.
If T < T max, i.e. the temperature of the water in the heat storage tank is not in an overheated state, but the energy storage battery is always in a charged and discharged state, in order to prevent overcharge, it is necessary to further determine the magnitude between the energy storage battery SOC and the maximum charge remaining capacity threshold SOC max of the energy storage battery.
If the SOC is more than or equal to the SOC max, namely, the energy storage battery is in an overcharged state at the moment, a charging switch of the photovoltaic battery assembly is controlled to be in an off state, the energy storage battery is stopped from being continuously charged, but the energy storage battery at the moment is in a continuously discharged state, and power is continuously supplied to the electrothermal conversion device.
If the SOC is less than SOC max, the energy storage battery is not in an overcharged state, and the energy storage battery is in a charged and discharged state, then the method returns to the execution step: and judging the size between the rated power P of the electrothermal conversion device and the output power P 1 of the photovoltaic battery assembly, and executing circularly.
As shown in fig. 2, a flow chart of a method for energy management of a novel solar water heating system according to an embodiment of the present invention is provided, and the method is applied to the energy management system of the novel solar water heating system in any of the above embodiments, and specifically includes the following steps:
Step 1: the data monitoring system monitors the output power P 1 of the photovoltaic cell assembly, the SOC value of the energy storage battery, the water level Z and the water temperature T of the heat storage water tank and the rated power P of the electrothermal conversion device, and sends the monitored data to the controller;
step 2: the controller judges the size between the rated power P of the electrothermal conversion device and the output power P 1 of the photovoltaic battery component;
If P is less than or equal to P 1, controlling a power supply switch, a charging switch and a discharging switch of the energy storage battery of the photovoltaic battery assembly to be in a closed state, and turning to the step 3; at this time, the photovoltaic cell assembly directly supplies power to the electric heating conversion device, the electric heating conversion device operates normally, electric energy is converted into heat energy, water in the heat storage water tank is heated, and the water temperature is increased. Meanwhile, the controller controls the charging switch of the photovoltaic cell assembly and the discharging switch of the energy storage battery to be in a closed state, so that when the redundant electric energy of the photovoltaic cell assembly can charge the energy storage battery, or when the power supply of the photovoltaic cell assembly is insufficient, the energy storage battery supplies power to the electric heat conversion device.
If P is more than P 1, controlling a discharging switch of the energy storage battery and a power supply switch of the photovoltaic battery assembly to be in a closed state, and turning to the step 3;
Step 3: judging the size between the residual capacity SOC value of the energy storage battery and the minimum discharge residual capacity threshold value SOC min of the energy storage battery;
if the SOC is less than or equal to the SOC min, controlling a charging switch of the photovoltaic battery assembly to be in a closed state, and turning to the step 4; the state of charge of the electric heating device is changed by the electric heating device, and the state of charge of the electric heating device is changed by the electric heating device.
If SOC is larger than SOC min, go to step 5; at this time, the remaining capacity SOC value of the energy storage battery is sufficient, and at this time, the energy storage battery supplies power to the electrothermal conversion device.
Step 4: controlling a discharge switch of the energy storage battery and a power supply switch of the photovoltaic battery assembly to be in an off state, and turning to the step 7;
Step 5: judging the size between the water level Z of the heat storage water tank and the lowest water level Z min;
if Z is not more than Z min, turning to the step 4; the fact that the water level in the heat storage water tank is too low at this time is indicated, if continuous heating is continued, the water temperature tends to be too high, and then a discharging switch of the energy storage battery and a power supply switch of the photovoltaic module need to be controlled to be in a disconnected state, and power supply to the electric heat conversion device is stopped.
If Z > Z min, it is indicated that the water level in the heat storage tank is sufficient at this time, but if the heating is continued, the water temperature may be too high, so it is necessary to further continue to determine the magnitude between the water temperature T of the heat storage tank and the water temperature threshold T max set by the heat storage tank, and therefore go to step 6;
step 6: judging the size between the water temperature T of the heat storage water tank and a water temperature threshold T max set by the heat storage water tank;
If T is more than or equal to T max, namely the water temperature in the heat storage water tank is overheated, controlling a discharging switch of the energy storage battery and a power supply switch of the photovoltaic module to be in a disconnected state, stopping supplying power to the electric heat conversion device, and turning to step 4;
If T is less than T max, namely the water temperature in the heat storage water tank is not in an overheated state, but the energy storage battery is always in a charged and discharged state, in order to prevent overcharge, the size between the energy storage battery SOC and the maximum charge residual capacity threshold value SOC max of the energy storage battery is required to be further judged, so that the step 7 is shifted;
step 7: judging the size between the SOC of the energy storage battery and the maximum charge remaining capacity threshold SOC max of the energy storage battery;
If the SOC is more than or equal to SOC max, at the moment, the energy storage battery is in an overcharged state, the charging switch of the photovoltaic battery assembly is controlled to be in an off state, and continuous charging of the energy storage battery is stopped, so that the charging switch of the photovoltaic battery assembly is controlled to be in the off state; however, the energy storage battery is in a state of continuous discharge at this time, and continuously supplies power to the electrothermal conversion device.
If SOC is less than SOC max, returning to step 2.
The foregoing has outlined rather broadly the more detailed description of embodiments of the invention, wherein the principles and embodiments of the invention are explained in detail using specific examples, the description of the embodiments being merely intended to facilitate an understanding of the general principles of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (6)
1. The energy management method is characterized by being applied to a novel solar water heating system, wherein the novel solar water heating system comprises a control system, at least one group of photovoltaic cell assemblies, an energy storage battery for storing electric energy, an electric heating conversion device for converting the electric energy into heat energy and a heat storage water tank for storing hot water; the output end of the photovoltaic cell assembly is connected with the input end of the control system, the output end of the control system is respectively connected with the energy storage battery and the input end of the electric heat conversion device, the electric heat conversion device is arranged in the heat storage water tank, the heat storage water tank is provided with a cold water inlet and a hot water outlet, the control system comprises a controller and a data monitoring system for monitoring the output power of the photovoltaic cell assembly, the state of the energy storage battery and the water temperature and water level in the heat storage water tank, and the controller controls the operation states of the energy storage battery and the electric heat conversion device according to the data monitored by the data monitoring system; the energy management method comprises the following steps:
Step 1: the data monitoring system monitors the output power P 1 of the photovoltaic cell assembly, the SOC value of the energy storage battery, the water level Z and the water temperature T of the heat storage water tank and the rated power P of the electrothermal conversion device, and sends the monitored data to the controller;
Step 2: the controller judges the size between the rated power P of the electrothermal conversion device and the output power P 1 of the photovoltaic battery component; if P is less than or equal to P 1, controlling a power supply switch, a charging switch and a discharging switch of the energy storage battery of the photovoltaic battery assembly to be in a closed state, and turning to the step 3; if P is more than P 1, controlling a discharging switch of the energy storage battery and a power supply switch of the photovoltaic battery assembly to be in a closed state, and turning to the step 3;
Step 3: judging the size between the residual capacity SOC value of the energy storage battery and the minimum discharge residual capacity threshold value SOC min of the energy storage battery; if the SOC is less than or equal to the SOC min, controlling a charging switch of the photovoltaic battery assembly to be in a closed state, and turning to the step 4; if SOC is larger than SOC min, go to step 5;
Step 4: controlling a discharge switch of the energy storage battery and a power supply switch of the photovoltaic battery assembly to be in an off state, and turning to the step 7;
Step 5: judging the size between the water level Z of the heat storage water tank and the lowest water level Z min; if Z is not more than Z min, turning to the step 4; if Z is larger than Z min, turning to the step 6;
Step 6: judging the size between the water temperature T of the heat storage water tank and a water temperature threshold T max set by the heat storage water tank; if T is more than or equal to T max, turning to step 4; if T is less than T max, turning to the step 7;
Step 7: judging the size between the SOC of the energy storage battery and the maximum charge remaining capacity threshold SOC max of the energy storage battery; if the SOC is more than or equal to SOC max, controlling a charging switch of the photovoltaic battery assembly to be in an off state; if SOC is less than SOC max, returning to step 2.
2. The method of claim 1, wherein the electrothermal transducer is a dc electrothermal transducer or an ac electrothermal transducer.
3. The energy management method according to claim 2, wherein the output end of the control system is connected with the direct-current electric heating conversion device through a DC/DC converter; or the output end of the control system is connected with the alternating current electric heating conversion device through an inverter.
4. The energy management method according to claim 1, wherein the output end of the photovoltaic cell assembly is further provided with a first voltage sensor and a first current sensor, the output end of the photovoltaic cell assembly is respectively connected with the input ends of the first voltage sensor and the first current sensor, the output ends of the first voltage sensor and the first current sensor are respectively connected with the input end of the data monitoring system, and the data monitoring system monitors the output power of the photovoltaic cell assembly by receiving the output voltage and the output current of the photovoltaic cell assembly fed back by the first voltage sensor and the first current sensor.
5. The energy management method of claim 1, further comprising a second voltage sensor and a second current sensor connected to the energy storage battery, wherein the second voltage sensor and the second current sensor have inputs connected to the energy storage battery and outputs connected to the input of the data monitoring system, and wherein the data monitoring system monitors the state of the energy storage battery by receiving the output voltage and the output current of the energy storage battery fed back by the second voltage sensor and the second current sensor.
6. The energy management method according to claim 1, wherein a water level sensor and a temperature sensor are provided in the thermal storage tank, the water level sensor and the temperature sensor are respectively connected with the data monitoring system, and the data monitoring system monitors water level and water temperature data in the thermal storage tank by using the water level sensor and the temperature sensor.
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| CN103062927B (en) * | 2012-12-26 | 2014-12-31 | 江苏振发投资发展有限公司 | Solar energy distributed type generation hot water combined supply system |
| TW201610378A (en) * | 2014-09-05 | 2016-03-16 | ming-xiu Li | Synergistic solar powered water heater |
| CN107196385A (en) * | 2017-07-26 | 2017-09-22 | 北京创昱科技有限公司 | The battery equalisation method and apparatus of photovoltaic energy storage system and the photovoltaic energy storage system |
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