CN115001033A - Household low-carbon energy system and method - Google Patents
Household low-carbon energy system and method Download PDFInfo
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- CN115001033A CN115001033A CN202210535053.8A CN202210535053A CN115001033A CN 115001033 A CN115001033 A CN 115001033A CN 202210535053 A CN202210535053 A CN 202210535053A CN 115001033 A CN115001033 A CN 115001033A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The application relates to a household low-carbon energy system and a household low-carbon energy method. The system comprises: the system comprises a user distribution box, a photovoltaic power generation system, a user energy storage cabinet, a heat pump water heater, electric equipment and an energy controller; the user distribution box comprises an electric energy meter and a plurality of air distribution circuit breakers connected in parallel; the photovoltaic power generation system, the user energy storage cabinet, the heat pump water heater and the electric equipment are respectively connected with the air distribution circuit breaker; the energy controller is respectively connected with the electric energy meter, the photovoltaic power generation system, the user energy storage cabinet and the electric equipment, and logic control is carried out on the photovoltaic power generation system, the user energy storage cabinet, the heat pump water heater and the electric equipment at least based on the working states and working parameters of the electric equipment, the photovoltaic power generation system, the user energy storage cabinet and the heat pump water heater. By adopting the system and the method, the electric energy can be reasonably used, and the dependence on a power grid and the energy cost are reduced.
Description
Technical Field
The application relates to the technical field of energy and energy storage, in particular to a household low-carbon energy system and method.
Background
With the implementation of the targets of 'carbon peak reaching and carbon neutralization', the installed scale of renewable energy sources such as photovoltaic energy, wind power energy and the like is increased year by year, and particularly, the renewable energy sources are distributed photovoltaic power generation systems. Because of low construction and operation cost and large installation area, the roof of the vast residential buildings (including rural residences, single buildings, residential buildings and the like) is increasingly installed.
At present, the energy supply of household energy is generally directly obtained from the mains supply of a power grid, and the available resources are not fully utilized in the mode. Or, the distributed photovoltaic is built on a roof, and a mode of 'self-generation self-use and residual electricity internet access' is mostly adopted in the installation and use process of the distributed photovoltaic power generation system, namely, the mode that the electric quantity generated by the distributed photovoltaic power generation system is used for self-sufficiency and the residual electric quantity is sent to a power grid is adopted.
However, although the mode of building distributed photovoltaic by adopting a roof is widely applied and relatively mature, a certain problem still exists, the distributed photovoltaic power generation has volatility and instability, and when the surplus power is on the internet, impact is generated on a power grid; because the price of the on-line electricity is lower than that of the user electricity, the energy cost is not minimized by the 'remaining electricity on-line' mode.
Disclosure of Invention
In view of the above, it is necessary to provide a power grid system that can use energy reasonably, reduce the dependence on the power grid, and reduce the energy cost.
In a first aspect, the present application provides a system for low carbon energy for a user. The system comprises: the system comprises a user distribution box, a photovoltaic power generation system, a user energy storage cabinet, a heat pump water heater, electric equipment and an energy controller;
the user distribution box comprises an electric energy meter and a plurality of parallel branch air circuit breakers, each branch air circuit breaker is connected with a mains supply inlet wire through the same bus, and the electric energy meter is connected with the bus;
the photovoltaic power generation system, the user energy storage cabinet, the heat pump water heater and the electric equipment are respectively connected with different air distribution circuit breakers;
the energy controller respectively with the electric energy meter photovoltaic power generation system user energy storage cabinet and the consumer homogeneous phase is connected, is at least based on the electric energy meter collection consumer power consumption parameter photovoltaic power generation system's operating condition photovoltaic power generation system's operating parameter user energy storage cabinet's operating condition user energy storage cabinet's operating parameter heat pump water heater's operating condition reaches heat pump water heater's operating parameter is right photovoltaic power generation system user energy storage cabinet heat pump water heater reaches the consumer carries out logic control.
In one embodiment, the household low-carbon energy system further comprises: and the main air circuit breaker is arranged on the bus and is positioned between the electric energy meter and the air distribution circuit breakers.
In one embodiment, the user low-carbon energy system further comprises: one end of each power supply cable is connected with the air distribution circuit breaker in a one-to-one correspondence mode, and the other end of each power supply cable is connected with the photovoltaic power generation system, the user energy storage cabinet, the heat pump water heater and the electric equipment in a one-to-one correspondence mode; many communication cables, one end all with the energy controller is connected, the other end with the electric energy meter photovoltaic power generation system user energy storage cabinet the heat pump water heater reaches consumer one-to-one connects.
In one embodiment, the photovoltaic power generation system comprises: and the photovoltaic inverter is connected with the air distribution circuit breaker through the power supply cable.
In one embodiment, the user energy storage cabinet comprises: and the energy storage converter is connected with the air distribution circuit breaker through the power supply cable.
In one embodiment, the heat pump water heater includes: the heat pump water heater main machine is connected with the air distribution circuit breaker through the power supply cable; the water tank is connected with the heat pump water heater main machine; and the temperature sensor is positioned on the water tank.
In one embodiment, the power controller includes: the input module comprises a user interaction input interface and is used for receiving user input information, wherein the user input information comprises time-of-use electricity price, user behavior, preset energy storage discharge power and preset energy storage charging power; the monitoring control module, with input module the electric energy meter photovoltaic power generation system user energy storage cabinet heat pump water heater reaches the consumer homogeneous phase is connected, is used for right photovoltaic power generation system user energy storage cabinet heat pump water heater reaches the consumer carries out logic control.
The energy controller can perform information interaction with the outside, and controls the photovoltaic power generation system, the user energy storage cabinet, the heat pump water heater and the electric equipment to perform logic control according to input information of an outside user.
In one embodiment, the energy controller is configured to: judging whether the current time period is in a low-power valley period; if yes, controlling the user energy storage cabinet to charge; if not, judging whether the photovoltaic power generation system is in a power generation state; if the photovoltaic power generation system is in a non-power generation state, controlling the user energy storage cabinet to be in grid-connected discharge; and if the photovoltaic power generation system is in a grid-connected discharging state, performing logic control on the user energy storage cabinet and the heat pump heater based on the power generation power of the photovoltaic power generation system.
It can be seen that the energy controller can control charging and discharging of the user energy storage cabinet according to the power utilization state (power utilization valley period), the state of the photovoltaic power generation system (whether in the power generation state) and the like, and can perform logic control on the heat pump heater, so that reasonable use of energy in the user low-carbon energy system can be realized, dependence on a power grid is reduced, and energy cost is reduced.
In a second aspect, the application also provides a method for a user to use low-carbon energy. The user low-carbon energy method is performed based on the user low-carbon energy system as described in any one of the embodiments of the first aspect and the first aspect, and the user low-carbon energy method comprises the following steps:
judging whether the current time period is in a low-power valley period; if yes, controlling the user energy storage cabinet to charge;
if not, judging whether the photovoltaic power generation system is in a power generation state;
if the photovoltaic power generation system is in a non-power generation state, controlling the user energy storage cabinet to be in grid-connected discharge;
and if the photovoltaic power generation system is in a grid-connected discharging state, performing logic control on the user energy storage cabinet and the heat pump heater based on the power generation power of the photovoltaic power generation system.
In one embodiment, if yes, controlling the user energy storage cabinet to charge includes: and controlling the user energy storage cabinet to charge according to preset energy storage charging power.
In one embodiment, if the photovoltaic power generation system is in a non-power generation state, controlling grid-connected discharge of the user energy storage cabinet includes: comparing the preset energy storage discharge power of the user energy storage cabinet with the load power of the currently used electric equipment; if the preset energy storage discharge power of the user energy storage cabinet is smaller than or equal to the load power, controlling the user energy storage cabinet to perform grid-connected discharge with the preset energy storage discharge power; and if the preset energy storage discharge power of the user energy storage cabinet is greater than the load power, controlling the user energy storage cabinet to perform grid-connected discharge by using the load power of the currently used electric equipment.
In one embodiment, if the photovoltaic power generation system is in a grid-connected discharge state, performing logic control on the user energy storage cabinet and the heat pump heater based on the generated power of the photovoltaic power generation system includes: if the photovoltaic power generation system is in a grid-connected discharging state, comparing the power generation power of the photovoltaic power generation system with the load power of the currently used electric equipment; if the generated power of the photovoltaic power generation system is smaller than or equal to the load power, judging whether the sum of the generated power of the photovoltaic power generation system and the power of the preset energy storage discharge power of the user energy storage cabinet is smaller than or equal to the load power; if so, controlling the photovoltaic power generation system to continue grid-connected discharge, and controlling the user energy storage cabinet to perform grid-connected discharge with first discharge power; if not, controlling the photovoltaic power generation system to continue grid-connected power generation, and controlling the user energy storage to perform grid-connected power generation with second discharge power; the first discharge power is the preset energy storage discharge power, and the second discharge power is the difference value between the load power and the discharge power of the photovoltaic power generation system; if the generated power of the photovoltaic power generation system is greater than the load power, judging whether the difference value between the generated power of the photovoltaic power generation system and the load power is less than or equal to the preset energy storage charging power of the user energy storage cabinet; if yes, controlling the user energy storage cabinet to charge at a first charging power; if not, judging whether the heat pump water heater is in a starting state, if not, controlling the heat pump water heater to start, and controlling the user energy storage cabinet to charge at a second charging power; if the heat pump water heater is in the starting state, controlling the user energy storage cabinet to charge at a third charging power; the first charging power is the difference value between the generating power of the photovoltaic power generation system and the load power, the second charging power is the difference value between the generating power of the photovoltaic power generation system and the load power and the operating power of the heat pump water heater, and the third charging power is the preset energy storage charging power of the user energy storage cabinet.
In the household low-carbon energy system and the method, the energy controller can collect the user power consumption parameters collected by the electric energy meter, the working state of the photovoltaic power generation system, the working parameters of the photovoltaic power generation system, the working state of the user energy storage cabinet, the working parameters of the user energy storage cabinet, the working state of the heat pump water heater and the working parameters of the heat pump water heater, control the charging and discharging of the user energy storage cabinet according to the user power consumption parameters, the working state of the photovoltaic power generation system, the working parameters of the user energy storage cabinet, the working states of the heat pump water heater and the working parameters of the heat pump water heater, and perform logic control on the heat pump heater, thereby realizing reasonable use of energy in the household low-carbon energy system, thereby reducing the dependence on the power grid and reducing the energy cost.
Drawings
Fig. 1 is a schematic structural diagram of a user low-carbon energy system in an embodiment;
FIG. 2 is a schematic diagram of an energy controller in a consumer low-carbon energy system, according to an embodiment;
FIG. 3 is a schematic flow chart of a method for a user to utilize low-carbon energy in one embodiment;
FIG. 4 is a flow chart illustrating the operation of the user energy storage cabinet in an embodiment when the photovoltaic power generation system is in a non-generating state;
fig. 5 is a flowchart illustrating an operating state of a user energy storage cabinet when a photovoltaic power generation system is in a power generation state according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It should be noted that when an object is considered to be "connected" to another object, it may be directly connected to the other object or connected to the other object through an intervening object. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, in this specification, the term "and/or" includes any and all combinations of the associated listed items.
At present, after large-scale distributed photovoltaic power generation is connected into a power grid, due to the characteristics of fluctuation and instability of photovoltaic power generation, great influence is brought to the scheduling safety of the power grid, and therefore, how to ensure the safety of the power grid when high proportion of distributed photovoltaic power generation is connected into the power grid becomes a problem.
In addition, because the energy cost of the household energy system is not minimized by the 'surplus electricity internet access' mode, the purpose of low carbon is achieved as far as possible, and therefore, how to construct a household low-carbon energy system, the dependence on a power grid is reduced as far as possible, and the energy cost is reduced also becomes a problem.
Based on this, please refer to fig. 1, where fig. 1 is a schematic structural diagram of a user low-carbon energy system according to an embodiment of the present application. As shown in fig. 1, the user low-carbon energy system includes a user distribution box 101, a photovoltaic power generation system 102, a user energy storage box 103, a heat pump water heater 104, a power consumption device 105, and an energy controller 106. The user distribution box 101 comprises an electric energy meter 1011 and a plurality of air distribution circuit breakers 1012 connected in parallel, and each air distribution circuit breaker 1012 is connected with a mains supply inlet wire through the same bus; the electric energy meter 1011 is connected with the bus; the photovoltaic power generation system 102, the user energy storage cabinet 103, the heat pump water heater 104 and the electric equipment 105 are respectively connected with different air distribution circuit breakers 1012; the energy controller 106 is respectively connected with the electric energy meter 1012, the photovoltaic power generation system 102, the user energy storage cabinet 103 and the electric equipment 105, and is at least used for logically controlling the photovoltaic power generation system 102, the user energy storage cabinet 103, the heat pump water heater 104 and the electric equipment 105 based on the user electricity utilization parameters acquired by the electric energy meter 1011, the working state of the photovoltaic power generation system 102, the working parameters of the photovoltaic power generation system 102, the working states of the user energy storage cabinet 103, the working parameters of the heat pump water heater 104.
In one embodiment, the user low-carbon energy system further includes: one end of each power supply cable 107 is connected with the air distribution circuit breaker 1012 in a one-to-one correspondence mode, and the other end of each power supply cable 107 is connected with the photovoltaic power generation system 102, the user energy storage cabinet 103, the heat pump water heater 104 and the electric equipment 105 in a one-to-one correspondence mode; and one end of each of the communication cables 108 is connected to the energy controller 106, and the other end of each of the communication cables is connected to the electric energy meter 1011, the photovoltaic power generation system 102, the user energy storage cabinet 103, the heat pump water heater 104 and the electric equipment 105 in a one-to-one correspondence manner.
In one embodiment, the photovoltaic power generation system 102 includes: the photovoltaic inverter 1021 is connected to the branch air circuit breaker 1012 via the power supply cable 107. The pv inverter 1021 is used to convert the variable dc voltage generated by the pv power generation system 102 into ac power (i.e., power frequency ac power) with a frequency required by the utility power, which is different from the generated power, i.e., the power resource extracted from the national grid.
In one embodiment, the user energy storage cabinet 103 includes: the energy storage converter 1031 is connected to the branch air circuit breaker 1012 via the power supply cable 107. The energy storage converter 1031 is used for controlling the charging and discharging processes of the energy storage device 103 to perform ac/dc conversion.
In one embodiment, the heat pump water heater 104 includes: a heat pump water heater main unit 1041 connected to the air separation circuit breaker 1012 via a power supply cable 107; the water tank 1042 is connected with the heat pump water heater host 1041; and a temperature sensor 1043 located on the water tank 1042.
In one embodiment, please refer to fig. 2, and fig. 2 is a schematic structural diagram of an energy controller in a user low-carbon energy system in an embodiment. As shown in fig. 2, the energy controller 106 includes: the input module 1061 includes a user interaction input interface, configured to receive user input information, where the user input information includes a time-of-use electricity price, a user behavior, a preset energy storage discharge power, and a preset energy storage charge power; and the monitoring control module 1062 is connected to the input module 1061, the electric energy meter 1011, the photovoltaic power generation system 102, the user energy storage cabinet 103, the heat pump water heater 104 and the electric equipment 105, and is configured to perform logic control on the photovoltaic power generation system 102, the user energy storage cabinet 103, the heat pump water heater 104 and the electric equipment 105.
In one embodiment, the energy controller 106 is configured to: judging whether the current time period is in a low-power valley period; if yes, controlling the user energy storage cabinet 103 to charge; if not, judging whether the photovoltaic power generation system 102 is in a power generation state; if the photovoltaic power generation system 102 is in a non-power generation state, controlling the user energy storage cabinet 103 to discharge in a grid-connected mode; if the photovoltaic power generation system 102 is in a grid-connected discharging state, the user energy storage cabinet 103 and the heat pump heater 104 are logically controlled based on the generated power of the photovoltaic power generation system 102.
In one embodiment, the user low-carbon energy system further comprises: the main air circuit breaker 109 is disposed on the bus and between the electric energy meter 1011 and the branch air circuit breaker 1012.
In one embodiment, as shown in fig. 3, a method for providing low-carbon energy to a user is provided, which is described by taking the method as an example for the user in fig. 1, and includes the following steps:
With the development of economy and the improvement of the living standard of people, the demand of society on electric energy is continuously increased, so that the capacity of a power grid is continuously enlarged, the power utilization structure is greatly changed, and the peak-to-valley difference of each large power grid is gradually increased. The valley electricity is according to the document spirit that the economic trade committee electricity industry bureau of the price bureau of things jointly issued, and resident's life power consumption peak valley electricity, for daytime the expression of power consumption peak period, masses will use the power consumption valley period to become the valley electricity, because the power consumption is few at night, has caused the bulk loss of electric power, attracts the user to use electricity at the valley period through changing the time price of electricity at the valley period, has reduced the power load of power consumption peak period, also can reduce the user and use the electric quantity expense.
Specifically, the user energy system may determine whether the user is in a low power valley section according to the time period, for example, when any time in the current time period from 8:00 to 22:00 is monitored, the user may determine the power peak section, and when any time in the current time period from 22:00 to 8:00 on the next day, the user may determine the power valley section. Or, the user energy system determines whether the user is in the low-peak period according to the electricity price, for example, when the electricity price in the current time period is 0.56 yuan/kwh, the user energy system is determined as the peak period of electricity consumption, and when the electricity price in the current time period is 0.28 yuan/kwh, the user energy system is determined as the low-peak period. The time periods of the peak power consumption period and the valley power consumption period and the power rate may be set through the input module 1061 of the energy controller 106.
And step 302, if yes, controlling the user energy storage cabinet to charge.
Specifically, if the current time interval is determined to be the low-valley period, the energy controller 106 controls the energy storage converter 1031 in the user energy storage cabinet 103 to charge with the preset energy storage charging power Pc, and stops charging when the state of charge (SOC) in the user energy storage cabinet reaches a set value, where the set value may be set through the input module 1061 in the energy controller.
And step 303, if not, judging whether the photovoltaic power generation system is in a power generation state.
Specifically, the operating state of the photovoltaic power generation system 102 (e.g., whether the photovoltaic power generation system is damaged), the operating parameters (weather state (e.g., rainy days), and the time state (depending on whether the current time period is in the evening)) are collected to determine whether the photovoltaic power generation system is in the power generation state. And if the working state is the damaged state, the weather state is rainy days or the current time period is night time, judging that the photovoltaic power generation system is in a non-power generation state, otherwise, judging that the photovoltaic power generation system is in a power generation state.
And 304, if the photovoltaic power generation system is in a non-power generation state, controlling the user energy storage cabinet to be in grid-connected discharge.
The grid-connected discharging means that the user energy storage cabinet is synchronously merged into the access point and operates according to the characteristic of a current source, the electric energy of the energy storage cabinet is fed back to the merging point for the electric equipment to use, and the electric power starts to be transmitted to the electric equipment 105.
With reference to the household low-carbon energy system in fig. 1, the electric energy meter 1011 collects parameters of the electric equipment 105 (the load power of the electric equipment 105 is Pi), operating parameters of the photovoltaic power generation system 102 (the real-time power generation of the photovoltaic power generation system 102 is Pg), operating parameters of the user energy storage cabinet 103 (the preset energy storage discharge power is Pd, the preset energy storage charge power is Pc, the real-time discharge power is Pdr, and the real-time charge power is Pcr), and operating parameters of the heat pump water heater (the operating power of the heat pump water heater 104 is Pr).
Specifically, referring to fig. 4, fig. 4 is a flowchart illustrating a working state of the user energy storage cabinet when the photovoltaic power generation system is in a non-power generation state in an embodiment.
Specifically, the preset energy storage discharge power Pd of the user energy storage cabinet 103 is compared with the load power Pi of the currently used electric device 105.
Specifically, if Pd is less than or equal to Pi, the user energy storage cabinet 103 is controlled to perform grid-connected discharge with the preset energy storage discharge power Pd, and if the SOC in the user energy storage cabinet 103 does not reach a set value, insufficient power is supplied by the commercial power.
Specifically, if Pd > Pi, the real-time discharge power Pdr is equal to the load power Pi of the electric equipment 105, and the user energy storage cabinet 103 is controlled to perform grid-connected discharge with the load power Pi of the electric equipment 105 currently used. And if the load power Pi is zero, the user energy storage cabinet 103 stands still.
And 305, if the photovoltaic system is in a grid-connected discharging state, performing logic control on the user energy storage cabinet and the heat pump heater based on the generated power of the photovoltaic power generation system.
Specifically, referring to fig. 5, fig. 5 is a flowchart illustrating a working state of a user energy storage cabinet when a photovoltaic power generation system is in a power generation state according to an embodiment.
Specifically, if the photovoltaic power generation system 102 is in the grid-connected discharge state, that is, the photovoltaic power generation system 102 is in the power generation state, the photovoltaic power generation system 102 continues grid-connected power generation, and the real-time power generation power of the photovoltaic power generation system 102 is compared with the load power Pi of the electric equipment 105.
The first discharging power is the preset energy storage discharging power, and the second discharging power is a difference value between the load power and the discharging power of the photovoltaic power generation system.
That is, if Pg is less than or equal to Pi, the sum of Pg and Pd and the magnitude of Pi are continuously judged;
if the Pg + Pd is less than or equal to Pi, the photovoltaic power generation system 102 is controlled to be connected to the grid for power generation, and meanwhile, the user energy storage cabinet 103 is controlled to discharge with preset energy storage discharge power Pd, and part of the electric quantity which is insufficient for the electric equipment 105 is supplied by commercial power;
and if the Pg + Pd > Pi, controlling the photovoltaic power generation system 102 to carry out grid-connected power generation, and simultaneously controlling the user energy storage cabinet 103 to discharge at the current real-time discharge power Pdr, wherein the current real-time discharge power Pdr is Pi-Pg.
The first charging power is a difference value between the generating power of the photovoltaic power generation system and the load power, the second charging power is a difference value between the generating power of the photovoltaic power generation system and the load power and between the generating power of the photovoltaic power generation system and the operating power of the heat pump water heater, and the third charging power is preset energy storage charging power of the user energy storage cabinet.
That is, if Pg > Pi, the difference between Pg and Pi and Pc are continuously determined;
if the Pg-Pi is less than or equal to Pc, controlling the user energy storage cabinet 103 to charge with real-time charging power Pcr, wherein Pcr is Pg-Pi;
if the Pg-Pi > Pc, continuously judging whether the heat pump water heater 104 is in the starting state;
if the heat pump water heater 104 is not started, controlling the heat pump water heater 104 to start heat storage until the temperature measured by the temperature sensor 1043 on the water tank 1042 reaches a set temperature (the set temperature can be set by the input module 1061 in the energy controller 106), and controlling the user energy storage cabinet 103 to charge with the real-time charging power Pcr at this time, wherein the real-time charging and discharging power Pcr at this time is Pg-Pi-Pr;
and if the heat pump water heater 104 is in the starting state, controlling the user energy storage cabinet 103 to charge with preset energy storage charging power as Pc.
As can be seen from the above-mentioned household low-carbon energy system and method, the energy controller 106 can control charging and discharging of the user energy storage cabinet 103 according to the power consumption parameter of the power consumption device 105, the working state of the photovoltaic power generation system 102, the working parameter of the photovoltaic power generation system 102, the working state of the user energy storage cabinet 103, the working state of the heat pump water heater 104 and the working parameter of the heat pump water heater 104 acquired by the electric energy meter 1011, and according to the power consumption parameter of the user, the working state of the photovoltaic power generation system, the working state of the user energy storage cabinet, the working parameter of the user energy storage cabinet, the working state of the heat pump water heater and the working parameter of the heat pump water heater, etc., and perform logic control on the heat pump water heater 104, thereby realizing reasonable use of energy in the above-mentioned low-carbon energy system for the user, thereby reducing the dependence on the power grid and reducing the energy cost.
It should be noted that, the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially displayed as indicated by the arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the above embodiments may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a part of the steps or stages in other steps.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A system for home use of low carbon energy, the system comprising: the system comprises a user distribution box, a photovoltaic power generation system, a user energy storage cabinet, a heat pump water heater, electric equipment and an energy controller;
the user distribution box comprises an electric energy meter and a plurality of parallel branch air circuit breakers, each branch air circuit breaker is connected with a mains supply inlet wire through the same bus, and the electric energy meter is connected with the bus;
the photovoltaic power generation system, the user energy storage cabinet, the heat pump water heater and the electric equipment are respectively connected with different air distribution circuit breakers;
the energy controller respectively with the electric energy counter photovoltaic power generation system user energy storage cabinet and the consumer homogeneous phase is connected, is at least based on the electric energy meter is gathered consumer's power consumption parameter photovoltaic power generation system's operating condition photovoltaic power generation system's operating parameter user energy storage cabinet's operating condition user energy storage cabinet's operating parameter heat pump water heater's operating condition reaches heat pump water heater's operating parameter is right photovoltaic power generation system user energy storage cabinet heat pump water heater reaches the consumer carries out logic control.
2. The system of claim 1, wherein the user low carbon energy system further comprises:
one end of each power supply cable is connected with the air distribution short-circuiting devices in a one-to-one correspondence mode, and the other end of each power supply cable is connected with the photovoltaic power generation system, the user energy storage cabinet, the heat pump water heater and the electric equipment in a one-to-one correspondence mode;
many communication cables, one end all with the energy controller is connected, the other end with the electric energy meter photovoltaic power generation system user energy storage cabinet the heat pump water heater reaches consumer one-to-one connects.
3. The system of claim 2, wherein the user energy storage cabinet comprises:
and the energy storage converter is connected with the air distribution short-circuit device through the power supply cable.
4. The system of claim 2, wherein the heat pump water heater comprises:
the heat pump water heater main machine is connected with the air distribution short-circuiting device through the power supply cable;
the water tank is connected with the heat pump water heater main machine;
and the temperature sensor is positioned on the water tank.
5. The system of claim 2, wherein the energy controller comprises:
the input module comprises a user interaction input interface and is used for receiving user input information, wherein the user input information comprises time-of-use electricity price, user behavior, preset energy storage discharge power and preset energy storage charging power;
the monitoring control module, with input module the electric energy meter photovoltaic power generation system user energy storage cabinet heat pump water heater reaches the consumer homogeneous phase is connected, is used for right photovoltaic power generation system user energy storage cabinet heat pump water heater reaches the consumer carries out logic control.
6. The system of claim 2, wherein the energy controller is configured to:
judging whether the current time period is in a power utilization valley period;
if yes, controlling the user energy storage cabinet to charge;
if not, judging whether the photovoltaic power generation system is in a power generation state;
if the photovoltaic power generation system is in a non-power generation state, controlling the user energy storage cabinet to be in grid-connected discharge;
and if the photovoltaic power generation system is in a grid-connected discharging state, performing logic control on the user energy storage cabinet and the heat pump heater based on the power generation power of the photovoltaic power generation system.
7. A user low-carbon energy method, characterized in that the user low-carbon energy method is performed based on the user low-carbon energy system of any one of claims 1 to 6, and the user low-carbon energy method comprises:
judging whether the current time period is in a low-power valley period;
if yes, controlling the user energy storage cabinet to charge;
if not, judging whether the photovoltaic power generation system is in a power generation state;
if the photovoltaic power generation system is in a non-power generation state, controlling the user energy storage cabinet to be in grid-connected discharge;
and if the photovoltaic power generation system is in a grid-connected discharging state, performing logic control on the user energy storage cabinet and the heat pump heater based on the power generation power of the photovoltaic power generation system.
8. The method of claim 7, wherein controlling the user energy storage cabinet to charge if the energy storage cabinet is in a low valley section comprises:
and controlling the user energy storage cabinet to charge according to preset energy storage charging power.
9. The method according to claim 7, wherein if the photovoltaic power generation system is in a non-power generation state, controlling grid-connected discharge of the user energy storage cabinet comprises:
comparing the preset energy storage discharge power of the user energy storage cabinet with the load power of the currently used electric equipment;
if the preset energy storage discharge power of the user energy storage cabinet is smaller than or equal to the load power, controlling the user energy storage cabinet to perform grid-connected discharge with the preset energy storage discharge power;
and if the preset energy storage discharge power of the user energy storage cabinet is greater than the load power, controlling the user energy storage cabinet to perform grid-connected discharge by using the load power of the currently used electric equipment.
10. The method according to claim 7, wherein if the photovoltaic power generation system is in a grid-connected discharge state, performing logic control on the user energy storage cabinet and the heat pump heater based on the generated power of the photovoltaic power generation system comprises:
if the photovoltaic power generation system is in a grid-connected discharging state, comparing the power generation power of the photovoltaic power generation system with the load power of the currently used electric equipment;
if the power generation power of the photovoltaic power generation system is smaller than or equal to the load power, judging whether the sum of the power generation power of the photovoltaic power generation system and the power of the preset energy storage discharge power of the user energy storage cabinet is smaller than or equal to the load power; if so, controlling the photovoltaic power generation system to continue grid-connected discharge, and controlling the user energy storage cabinet to perform grid-connected discharge with first discharge power; if not, controlling the photovoltaic power generation system to continue grid-connected power generation, and controlling the user energy storage to perform grid-connected power generation with second discharge power; the first discharging power is the preset energy storage discharging power, and the second discharging power is the difference value between the load power and the discharging power of the photovoltaic power generation system;
if the generated power of the photovoltaic power generation system is larger than the load power, judging whether the difference value between the generated power of the photovoltaic power generation system and the load power is smaller than or equal to the preset energy storage charging power of the user energy storage cabinet; if yes, controlling the user energy storage cabinet to charge at a first charging power; if not, judging whether the heat pump water heater is in a starting state, if not, controlling the heat pump water heater to start, and controlling the user energy storage cabinet to charge at a second charging power; if the heat pump water heater is in the starting state, controlling the user energy storage cabinet to charge at a third charging power; the first charging power is the difference value between the generating power of the photovoltaic power generation system and the load power, the second charging power is the difference value between the generating power of the photovoltaic power generation system and the load power and the operating power of the heat pump water heater, and the third charging power is the preset energy storage charging power of the user energy storage cabinet.
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| CN202210535053.8A CN115001033A (en) | 2022-05-17 | 2022-05-17 | Household low-carbon energy system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024065997A1 (en) * | 2022-09-27 | 2024-04-04 | 美的集团股份有限公司 | Photovoltaic-based heat pump water heater control method and apparatus, and device and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024065997A1 (en) * | 2022-09-27 | 2024-04-04 | 美的集团股份有限公司 | Photovoltaic-based heat pump water heater control method and apparatus, and device and storage medium |
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