CN115313372A

CN115313372A - Building, power system and power supply method thereof, air conditioning equipment and control method thereof

Info

Publication number: CN115313372A
Application number: CN202211020652.2A
Authority: CN
Inventors: 侯超; 柏秋实; 徐源鸿; 吴一迪; 宋钦勇
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2022-11-08

Abstract

The invention relates to a building, a power system and a power supply method thereof, air conditioning equipment and a control method thereof. The power system of the building comprises a power supply end, a power utilization end and an energy storage end; the power supply end comprises a first power supply end and a second power supply end, the first power supply end is connected with the photovoltaic power generation system, and the second power supply end is a mains supply access end; the first power end is connected with the air conditioning module, the second power end is connected with the charging pile equipment, and the third power end is connected with the second power supply end; the first energy storage end is connected with the cold accumulation module, and the second energy storage end is connected with the storage battery; the first power supply end and the second power supply end are connected with the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end in a switchable manner, and the priority of power supply of the first power supply end is prior to that of the second power supply end; the first power supply end supplies power to the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end in a set priority order.

Description

Building, power system and power supply method thereof, air conditioning equipment and control method thereof

Technical Field

The invention relates to the technical field of power control of buildings, in particular to a building, a power system and a power supply method thereof, air conditioning equipment and a control method thereof.

Background

Modern buildings, particularly high-rise buildings, consume a large amount of energy, and the energy consumption of the air conditioning system occupies a large part of the energy. In order to solve the problem of high energy consumption, a photovoltaic power generation system is configured on a plurality of high-rise buildings at present, self power generation is used for self consumption, and if the self generated energy is large, the output of electric quantity can be carried out.

However, the existing buildings have some problems in the application of the photovoltaic power generation system, which causes inconvenience in the use process and does not maximize and efficiently utilize the electric quantity generated by photovoltaic power generation.

Disclosure of Invention

The invention provides a building, a power system and a power supply method thereof, air conditioning equipment and a control method thereof, and aims to solve the technical problem that the utilization effect of electric quantity generated by photovoltaic power generation in the prior art is poor.

The invention provides a power system of a building, which comprises a power supply end, a power utilization end and an energy storage end; the power supply end comprises a first power supply end and a second power supply end, the first power supply end is connected with the photovoltaic power generation system, and the second power supply end is a mains supply access end; the power utilization end is used for being connected with power utilization equipment in a building and transmitting power; the electric equipment in the building comprises cold accumulation air-conditioning equipment and charging pile equipment; the cold accumulation air conditioning equipment comprises an air conditioning module and a cold accumulation module, and the charging pile equipment comprises a storage battery; the power utilization end comprises a first power utilization end, a second power utilization end and a third power utilization end; the first power utilization end is connected with an air conditioning module of the cold accumulation air conditioning equipment, the second power utilization end is connected with the charging pile equipment, and the third power utilization end is connected with the second power supply end; the energy storage end comprises a first energy storage end and a second energy storage end, the first energy storage end is connected with a cold accumulation module of the cold accumulation air-conditioning equipment, and the second energy storage end is connected with a storage battery of the charging pile equipment; the first power supply end and the second power supply end are switchably connected with the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end and supply power to the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end, and the priority of the power supply of the first power supply end to the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end is prior to that of the second power supply end; the first power supply end supplies power to the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end, and the first power supply end, the second power utilization end, the first energy storage end and the second energy storage end have a set priority order.

The priority of the first power supply end for supplying power to the first power end is higher than that of the second power end, and the priority of the first power supply end for supplying power to the second power end is higher than that of the third power end.

The first power supply end supplies power to the first energy storage end in a priority order after the first power supply end is higher than the first power utilization end and is higher than the second energy storage end; the priority of supplying power to the second energy storage end is prior to the third electric end and is inferior to the second electric end.

The second power supply end and the first power supply end are connected to supply power to the air conditioning module at a priority lower than the priority of the cold accumulation module for providing a cold source for the air conditioning module.

The power system comprises a refrigeration load detection module, a control module and a control module, wherein the refrigeration load detection module is used for detecting the load demand of the indoor space for refrigeration; in a mode in which the air conditioning module operates to adjust the temperature of the indoor space according to the cold storage module providing the cold source, the first and second power supply terminals are configured to:

if the refrigeration load of the indoor space is in a first interval, the first power supply end and the second power supply end do not supply power to the first power utilization end, and the cold accumulation module provides a cold source for the air conditioning module;

if the refrigeration load of the indoor space is in a second interval, the first power supply end or the second power supply end supplies power to the first power utilization end, and the cold accumulation module provides a cold source for the air conditioning module;

if the refrigeration load of the indoor space is in a third interval, the first power supply end or the second power supply end supplies power to the first power utilization end, and the cold accumulation module does not provide a cold source for the air conditioning module;

the first interval is that the value of the refrigeration load in the indoor space which exceeds a standard value is smaller than a first set value; the second interval is that the value of the refrigeration load of the indoor space exceeding the standard value is larger than the first set value and smaller than the second set value; and the third interval is that the value of the refrigeration load of the indoor space exceeding the standard value is greater than a second set value.

Wherein the second section includes a plurality of gear positions of the refrigeration load; the first and second electrical terminals are configured to:

under the gear with low refrigeration load, the air conditioning module has more cold energy input into the indoor space according to the cold source provided by the cold accumulation module, and the air conditioning module has less cold energy generated according to the power supply of the first power supply end or the second power supply end;

and under the gear with high refrigeration load, the air conditioning module has less cold quantity input into the indoor space according to the cold source provided by the cold accumulation module, and the air conditioning module generates more cold quantity according to the power supply of the first power supply end or the second power supply end.

The second interval comprises a first gear, a second gear and a third gear, wherein the refrigeration load of the indoor space is sequentially increased; the first and second electrical terminals are configured to:

in the first gear, according to the power supply of the first power supply end or the second power supply end, the proportion of the cold energy generated by the air conditioning module and input into the indoor space is 25%, and according to the cold source provided by the cold accumulation module, the proportion of the cold energy generated by the air conditioning module and input into the indoor space is 75%;

in a second gear, the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 50% according to the power supply of the first power supply end or the second power supply end, and the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 50% according to the cold source provided by the cold accumulation module;

and in the third gear, according to the power supply of the first power supply end or the second power supply end, the cold energy generated by the air conditioning module and input into the indoor space accounts for 75%, and according to the cold source provided by the cold accumulation module, the cold energy generated by the air conditioning module and input into the indoor space accounts for 25%.

The building with low energy consumption comprises a photovoltaic power generation system, a cold accumulation air conditioning device, a charging pile device and the power system.

The power supply method of the power system based on the building provided by the invention comprises the following steps:

step S1, detecting whether the power supply quantity of a first power supply end meets the power load of a power utilization end connected with the first power supply end;

if so, maintaining the first power supply end to supply power to the power utilization end connected with the first power supply end; if not, executing the step S2;

and S2, according to the priority sequence of the first power supply end for supplying power to the first power utilization end, the second power utilization end and the third power utilization end, stopping the connection of the first power supply end to the power utilization end with the later priority in sequence, and switching to the second power supply end for supplying power until the first power supply end can meet the power utilization load of the power utilization end connected with the first power supply end.

If the detection result in the step S1 is yes, the step S3 is also executed;

s3, connecting the first power supply end with the first energy storage end;

s4, detecting whether the cold accumulation module is saturated or not;

if not, the connection between the first power supply end and the first energy storage end is maintained.

If the detection result in the step S4 is yes, executing a step S5;

step S5, connecting the first power supply end with the second energy storage end;

step S6, detecting whether the storage battery is saturated;

if not, the connection between the first power supply end and the second energy storage end is maintained.

If the detection result in the step S6 is yes, executing a step S7;

and S7, connecting the first power supply end with the second power supply end.

The invention provides photovoltaic cold accumulation air conditioning equipment which comprises a power supply module, an air conditioning module, a cold accumulation module and a refrigeration load detection module; the power supply module comprises a photovoltaic power generation module and a mains supply access module; the photovoltaic power generation module is connected with the air conditioning module and the cold accumulation module and used for supplying power to the air conditioning module and the cold accumulation module; the commercial power access module is connected with the air conditioning module and used for supplying power to the air conditioning module; the cold accumulation module is connected with the air conditioning module and is used for providing a cold source for the air conditioning module; the air conditioning module is connected with the indoor space and used for adjusting the temperature of the indoor space according to the power supply of the power supply module and/or the cold accumulation module to provide a cold source; the refrigeration load detection module is used for detecting the load requirement of the indoor space on refrigeration; when the air conditioning module is operated in a mode in which the cold storage module provides a cold source for the air conditioning module, the air conditioning module is configured to:

if the refrigeration load of the indoor space is in a first interval, the air conditioning module completely adjusts the temperature of the indoor space according to the cold source provided by the cold accumulation module;

if the refrigeration load of the indoor space is in a second interval, the air conditioning module adjusts the temperature of the indoor space according to the cold source provided by the cold accumulation module and the power supply of the photovoltaic power generation module or the commercial power access module;

if the refrigeration load of the indoor space is in a third interval, the air conditioning module regulates the temperature of the indoor space completely according to the power supply of the photovoltaic power generation module or the commercial power access module;

Wherein the second section includes a plurality of gear positions of the refrigeration load; the air conditioning module is configured to:

when the refrigeration load is low, the air conditioning module has more cold energy input into the indoor space according to the cold source provided by the cold accumulation module, and the air conditioning module generates less cold energy according to the power supply of the photovoltaic power generation module or the commercial power access module;

when the refrigeration load is high, the air conditioning module has less cold quantity input into the indoor space according to the cold source provided by the cold accumulation module, and the air conditioning module has more cold quantity generated according to the power supply of the photovoltaic power generation module or the commercial power access module.

The second interval comprises a first gear, a second gear and a third gear, wherein the refrigeration load of the indoor space is increased in sequence; the air conditioning module is configured to:

in a first gear, according to the power supply of the photovoltaic power generation module or the commercial power access module, the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 25%, and according to the cold source provided by the cold accumulation module, the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 75%;

in the second gear, the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 50% according to the power supply of the photovoltaic power generation module or the commercial power access module, and the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 50% according to the cold source provided by the cold accumulation module;

and in the third gear, according to the power supply of the photovoltaic power generation module or the commercial power access module, the cold energy generated by the air conditioning module and input into the indoor space accounts for 75%, and according to the cold source provided by the cold accumulation module, the cold energy generated by the air conditioning module and input into the indoor space accounts for 25%.

The refrigeration load detection module is used for detecting the temperature of the indoor space and determining the refrigeration load of the indoor space according to the difference value between the temperature of the indoor space and the set temperature;

if the temperature of the indoor space is higher than the set temperature and the difference value between the indoor space and the set temperature is 3-5 ℃, the refrigeration load is in a third gear;

if the temperature of the indoor space is higher than the set temperature and the difference value between the indoor space and the set temperature is 1-3 ℃, the refrigeration load is in a second gear;

and if the temperature of the indoor space is higher than the set temperature and the difference value between the indoor space and the set temperature is 0-1 ℃, the refrigeration load is in a first gear.

The invention provides a control method of photovoltaic cold accumulation air conditioning equipment, which comprises the following steps:

detecting the load demand of the indoor space for refrigeration under the condition that the air conditioning module operates in a mode of regulating the temperature of the indoor space according to the cold source provided by the cold accumulation module;

if the refrigeration load of the indoor space is in a first interval, controlling the air conditioning module to completely regulate the temperature of the indoor space according to the cold source provided by the cold accumulation module;

if the refrigeration load of the indoor space is in a second interval, controlling the air conditioning module to regulate the temperature of the indoor space according to the cold source provided by the cold accumulation module and the power supply of the photovoltaic power generation module or the commercial power access module;

if the refrigeration load of the indoor space is in a third interval, controlling the air conditioning module to completely adjust the temperature of the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module;

the first interval is that the value of the refrigeration load of the indoor space exceeding a standard value is smaller than a first set value; the second interval is that the value of the refrigeration load of the indoor space exceeding the standard value is larger than the first set value and smaller than the second set value; and the third interval is that the value of the refrigeration load of the indoor space exceeding the standard value is greater than the second set value.

Wherein the second section includes a plurality of cooling load gears; the control method further comprises the following steps:

detecting a gear of a refrigeration load;

when the refrigeration load is low, the air conditioning module is controlled to input more cold energy into the indoor space according to the cold source provided by the cold accumulation module, and the air conditioning module generates less cold energy according to the power supply of the photovoltaic power generation module or the commercial power access module;

and when the refrigeration load is high, the air conditioning module is controlled to input less cold energy into the indoor space according to the cold source provided by the cold accumulation module, and the air conditioning module generates more cold energy according to the power supply of the photovoltaic power generation module or the commercial power access module.

The second interval comprises a first gear, a second gear and a third gear, wherein the refrigeration load of the indoor space is sequentially increased;

if the detection result indicates that the refrigeration load is in a first gear, controlling the air conditioning module to generate and input 25% of the cold energy into the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module, and controlling the air conditioning module to generate and input 75% of the cold energy into the indoor space according to the cold source provided by the cold accumulation module;

if the detection result is that the refrigeration load is in a second gear, controlling the air conditioning module to generate and input 50% of the cold energy into the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module, and controlling the air conditioning module to generate and input 50% of the cold energy into the indoor space according to the cold source provided by the cold accumulation module;

and if the detection result is that the refrigeration load is in a third gear, controlling the air conditioning module to generate and input cold energy into the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module to account for 75%, and controlling the air conditioning module to generate and input cold energy into the indoor space according to the cold source provided by the cold accumulation module to account for 25%.

When the refrigeration load demand of the indoor space is detected, the temperature of the indoor space is detected, and the refrigeration load of the indoor space is determined according to the difference value between the temperature of the indoor space and the set temperature;

Compared with the prior art, the building, the power system and the power supply method thereof, the air conditioning equipment and the control method thereof provided by the invention have the following advantages:

according to the electric power system of the building, the priority order is set for the power consumption requirements of the first power consumption end, the second power consumption end, the first energy storage end and the second energy storage end, and the photovoltaic power generation system can meet all the power consumption requirements of the first power consumption end, the second power consumption end, the first energy storage end and the second energy storage end when the power generated by the photovoltaic power generation system is sufficient, so that the electric quantity introduced to a municipal power grid through the second power supply end can be reduced, and the electric quantity consumption of the municipal power grid is reduced. The photovoltaic power generation system can supply power to the power demand with higher priority when the power generated by the photovoltaic power generation system is limited; for example, the first and second power terminals have more urgent requirements for power supply, and accordingly, the energy storage terminal has no urgent requirement for power supply, so that the second power terminal can mainly focus on power supply to the first and second power terminals, and the energy storage device connected to the energy storage terminal is powered by the second power terminal, or power supply to the energy storage device is suspended; by the arrangement, on one hand, the power generated by the photovoltaic power generation system can be effectively and efficiently utilized, and on the other hand, the power consumption of the municipal power grid can be reduced. And the second power supply end supplies power to the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end completely within the time that the power generated by the photovoltaic power generation system is extremely limited or even does not generate power, so that the power utilization requirement is met, and the building is ensured to normally run depending on the power.

The power supply method for the building and the building have the advantages that the power supply method is consistent with the power system of the building, and the description is omitted.

The photovoltaic cold accumulation air conditioning equipment provided by the invention detects the refrigeration load of the indoor space through the refrigeration load detection module, when the refrigeration load is in a first interval and the refrigeration load is low, the air conditioning module completely adjusts the temperature of the indoor space according to the cold source provided by the cold accumulation module, so that the requirement on the temperature adjustment of the indoor space can be effectively met, the power supply of the photovoltaic power generation module and the mains supply access module is not relied on, the requirement on the adjustment of the indoor space can be maintained in the time when the photovoltaic power generation module generates less or no power, and the consumption of the power introduced by the municipal power grid is reduced. When the refrigeration load is in the second interval and the refrigeration load is relatively high, the cold energy input into the indoor space by the cold accumulation module alone cannot meet the requirement of regulating the temperature of the indoor space, therefore, under the condition, the air conditioning module not only can generate cold energy according to the cold source provided by the cold accumulation module, but also can generate cold energy according to the power supply of the photovoltaic power generation module or the commercial power access module, more cold energy can be generated in unit time, and therefore, the two parts of cold energy are input into the indoor space, and the temperature of the indoor space can be regulated timely and effectively. When the refrigeration load is in the third interval and the refrigeration load is higher, the air conditioning module generates power completely according to the power supply of the photovoltaic power generation module or the commercial power access module, and can generate larger cooling capacity in unit time to be input into the indoor space, so that the requirement on temperature regulation of the indoor space with larger refrigeration load is met.

The control method of the photovoltaic cold accumulation air conditioning equipment has the beneficial effect consistent with that of the photovoltaic cold accumulation air conditioning equipment, and is not repeated.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

FIG. 1 is a schematic diagram of an electrical system of a building in an embodiment of the invention;

FIG. 2 is a schematic flow diagram of a method of supplying power based on the power system of the building shown in FIG. 1;

FIG. 3 is a schematic diagram of a photovoltaic cold storage air conditioning device in an embodiment of the invention;

FIG. 4 is a flow chart of a control method of the photovoltaic cold storage air conditioning equipment in the embodiment of the invention;

fig. 5 is a flowchart of control according to the gear of the cooling load of the indoor space in the embodiment of the present invention.

In the figure:

10-a power supply terminal; 11-a first supply terminal; 12-a second supply terminal;

20-power consumption end; 21-a first powered end; 22-a second electrical terminal; 23-a third electrical terminal;

30-an energy storage end; 31-a first energy storage end; 32-a second energy storage end;

40-a photovoltaic power generation system;

50-cold storage air conditioning equipment; 51-an air conditioning module; 52-a cold accumulation module; 53-refrigeration load detection module

60-a charging pile device; 61-a charging pile body; 62-storage battery.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Embodiments of a building, a power system and a power supply method thereof, an air conditioning apparatus, and a control method thereof according to the present invention will be described below with reference to the accompanying drawings.

In one embodiment of the power system of a building, as shown in fig. 1, the power system includes a power supply terminal 10, a power consumption terminal 20, and an energy storage terminal 30.

For the building in this embodiment, it has various electric devices, such as lighting devices, elevator devices, air conditioning devices, charging pile devices, and the like. To meet the power demand of these devices, the building is connected to and receives power from the municipal power grid, which is input to the aforementioned powered devices for use by the building's internal power transmission network. In addition to the access to the municipal power grid, the building is equipped with a photovoltaic power generation system 40 that can autonomously perform photovoltaic power generation, as well as supply the aforementioned consumers.

In addition, energy storage devices are provided within the building that convert the electricity generated by the photovoltaic power generation system 40, and even the electricity input from the municipal power grid, to other forms of energy for storage, release, and utilization as needed. Specifically, the air conditioning apparatus inside the building is a cold storage air conditioning apparatus 50, such as an ice storage air conditioning apparatus; the cold accumulation air conditioning equipment 50 comprises an air conditioning module 51 and a cold accumulation module 52, the whole cold accumulation air conditioning equipment 50 and the air conditioning module 51 are used as electric equipment, but the cold accumulation module 52 receives electric energy from the photovoltaic power generation system 40 and even a municipal power grid, converts the electric energy into a cold source (such as ice) and stores the cold source, and the cold source stored in the cold accumulation air conditioning equipment is provided for the air conditioning module 51 to refrigerate when needed, so that the consumption of the air conditioning module 51 on the electric power accessed to the first power supply section 11 and the second power supply section 12 can be reduced, and therefore, the cold accumulation module 52 belongs to an energy storage device. Charging post equipment 60 in the building is including filling post main part 61 and battery 62, fills post main part 61 and can be directly to the vehicle of connecting etc. charge, and it belongs to consumer, but battery 62 receives the electric energy and stores in battery 62 from photovoltaic power generation system 40 and even municipal power grid, and the electric quantity that battery 62 stored can be used for charging the vehicle or do other uses when needing, therefore battery 62 belongs to energy memory.

In this embodiment, the power supply terminal 10 is a connection terminal between an internal power transmission network of a building and a municipal power grid and a photovoltaic power generation system 40, and the power supply terminal 10 specifically includes a first power supply terminal 11 and a second power supply terminal 12, where the first power supply terminal 11 is connected to the photovoltaic power generation system 40, and the second power supply terminal 12 is a mains supply access terminal. That is, the electricity generated by the photovoltaic power generation system 40 is introduced into the internal power transmission network of the building through the first power supply terminal 11, and the electricity provided by the municipal power grid is introduced into the internal power transmission network of the building through the second power supply terminal 12 serving as the commercial power input terminal, and then is transmitted to each electric device for use.

In this embodiment, the power consumer terminal 20 is a connection terminal of an internal power transmission network of a building and a power consumer, and is used for connecting with and transmitting power to the power consumer in the building. As described above, the electric devices in the building include the cold storage air conditioning device 50 and the charging pile device 60; the cold storage air conditioning device 50 includes an air conditioning module 51 and a cold storage module 52, and the charging post device 60 includes a charging post body 61 and a storage battery 62. Correspondingly, the power consumption end 20 comprises a first power consumption end 21 and a second power consumption end 22, wherein the first power consumption end 21 is connected with the air conditioning module 51 of the cold storage air conditioning equipment 50 to supply power to the air conditioning module 51; second power consumption end 22 is connected with filling electric pile equipment 60, specifically is connected with filling electric pile main part 61 in filling electric pile equipment 60, to filling electric pile main part 61 power supply. In addition, the power utilization end 20 further comprises a third power utilization end 23; the third power terminal 23 is connected to the second power terminal 12, and the third power terminal 23 can connect the power generated by the photovoltaic power generation system 40 to the internal power transmission network of the building via the second power terminal 12 and input the power to other electric devices in the building.

In addition to the first, second and

third power terminals

21, 22, 23, the power system also includes other, more power terminals for connecting with other power consumers in the building to supply power to them.

As described above, in the building, the cold accumulation module 52 of the cold accumulation air conditioner 50 is an energy storage device, and the battery 62 in the charging pile device 60 is an energy storage device, so in the present embodiment, the energy storage end 30 includes the first energy storage end 31 and the second energy storage end 32, the first energy storage end 31 is connected to the cold accumulation module 52 of the cold accumulation air conditioner 50, and the second energy storage end 32 is connected to the battery 62 of the charging pile device 60.

In the embodiment, the first power supply terminal 11 and the second power supply terminal 12 are switchably connected to and supply power to the first power supply terminal 21, the second power supply terminal 22, the first energy storage terminal 31 and the second energy storage terminal 32, and the first power supply terminal 11 has priority over the second power supply terminal in supplying power to the first power supply terminal 21, the second power supply terminal 22, the first energy storage terminal 31 and the second energy storage terminal 32.

In other words, the first power supply terminal 11 and the second power supply terminal 12 can be connected to and supply power to the first power terminal 21, and similarly can be connected to and supply power to the second power terminal 22, the first energy storage terminal 31 and the second energy storage terminal 32. Moreover, taking the first power terminal 21 as an example, when the first power terminal 11 supplies power to the first power terminal 21, for example, the second power terminal 12 may be switched to connect with the first power terminal 21 and supply power to the first power terminal 21, and at this time, the first power terminal 11 does not supply power to the first power terminal 21 any more; for example, when the second power supply terminal 12 supplies power to the first power supply terminal 21, the connection between the first power supply terminal 11 and the first power supply terminal 21 can be switched to supply power, and at this time, the second power supply terminal 12 does not supply power to the first power supply terminal 21 any more.

On the basis, in the case that the power consumption requirements of the first power end 21, the second power end 22, the first energy storage end 31, and the second energy storage end 32 can be satisfied by the power generation capability of the photovoltaic power generation system 40, the power generated by the photovoltaic power generation system 40 introduced by the first power end 11 is input to each electric device and the energy storage device through the first power end 21, the second power end 22, the first energy storage end 31, and the second energy storage end 32, and the second power end 12 does not supply power to the first power end 21, the second power end 22, the first energy storage end 31, and the second energy storage end 32. And under the condition that the power generation capacity of the photovoltaic power generation system 40 cannot meet the power consumption requirement of one or more of the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32, the power provided by the municipal power grid introduced by the second power supply end 12 is input to the power consumption equipment and the energy storage device, the power consumption requirement of which cannot be met, through the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32.

In the present embodiment, the first power supply terminal 11 supplies power to the first power terminal 21, the second power terminal 22, the first energy storage terminal 31 and the second energy storage terminal 32 in a set priority order. In other words, the power consumption requirements of the power consumption equipment and the energy storage device connected to the first power consumption end 21, the second power consumption end 22, the first energy storage end 31 and the second energy storage end 32 are divided into different priorities, the first power supply end 11 preferentially meets the power consumption requirement with a higher priority when supplying power, and after the power consumption requirement with the higher priority is met, the power consumption requirement with a lower priority is further met under the condition that the power generated by the photovoltaic power generation system 40 is sufficient. That is, if the power generated by the photovoltaic power generation system 40 can meet the power demand of the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32, the photovoltaic power generation system 40 supplies power to the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32 through the first power supply end 11; if the power generated by the photovoltaic power generation system 40 cannot satisfy all the power requirements of the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32, the photovoltaic power generation system 40 only supplies power to one or more of the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32 according to the priority from high to low, and the other power requirements with lower priorities are met or temporarily suspended by the second power end 12 (mainly aiming at the first energy storage end 31 and the second energy storage end 32). If the power generated by the photovoltaic power generation system 40 cannot meet the highest priority power demand, the power demands of the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32 are completely met by the power provided by the municipal power grid introduced by the second power supply end 12.

In practice, the photovoltaic power generation system 40 may generate different power under different conditions, for example, the photovoltaic power generation system 40 may generate a large amount of power in the daytime, hardly generate power at night, generate more power in the weather with strong illumination, and generate less power in the weather with insufficient illumination, so that the power generated by the photovoltaic power generation system 40 in many times is limited, and the power generated in other times is sufficient. The power consumption requirements of the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32 are also divided into a light and a heavy. In this embodiment, by setting the priority order to the power consumption requirements of the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32, when the power generated by the photovoltaic power generation system 40 is sufficient, the photovoltaic power generation system 40 can satisfy all the power consumption requirements of the first power end 21, the second power end 22, the first energy storage end 31 and the second energy storage end 32, so that the power consumption of the municipal power grid caused by the second power supply end 12 can be reduced, and the power consumption of the municipal power grid is reduced. When the power generated by the photovoltaic power generation system 40 is limited, the photovoltaic power generation system 40 can supply power to the power demand with higher priority; for example, the first electrical terminal 21 and the second electrical terminal 22 have a more urgent demand for power supply, and accordingly, the energy storage terminal has a less urgent demand for power supply, so that the power supply to the first electrical terminal 21 and the second electrical terminal 22 can be mainly focused, the second power supply terminal 12 supplies power to the energy storage device connected to the energy storage terminal, or the power supply to the energy storage device is suspended; with this arrangement, on the one hand, the electric power generated by the photovoltaic power generation system 40 can be effectively and efficiently utilized, and on the other hand, the consumption of electric power to the municipal power grid can be reduced. The time when the power generated by the photovoltaic power generation system 40 is extremely limited or even does not generate power is completely supplied to the first power utilization end 21, the second power utilization end 22, the first energy storage end 31 and the second energy storage end 32 by the second power supply end 12, so that the power utilization requirement is met, and the normal operation of the building depending on the power is ensured.

In an embodiment of the power system of the building, the first power terminal 11 prioritizes the powering of said first power terminal 21 over the second power terminal 22 and the powering of the second power terminal 22 over the third power terminal 23.

In general, in a building, it is necessary to cool an indoor space in summer or in hot weather, for example, and it is not necessary to charge a vehicle, which is less important than cooling the indoor space. Therefore, in this embodiment, the priority of the first power supply terminal 11 for supplying power to the first power terminal 21 is set to be higher than that of the second power terminal 22, and the priority of the first power supply terminal 11 for supplying power to the second power terminal 22 is set to be higher than that of the third power terminal 23, so that the first power supply terminal 11 preferentially supplies power to the air-conditioning module 51, when the power generated by the photovoltaic power generation system 40 is large, the first power supply terminal 11 further supplies power to the charging pile main body 61 on the basis of satisfying the power supply to the air-conditioning module 51, and when the condition is not satisfied, the first power supply terminal 11 does not supply power to the charging pile main body 61. When the photovoltaic power generation system 40 generates more power, the first power supply end 11 is out of the power demand of the first power end 21 and the second power end 22, and the power demand of the first energy storage end 31 and the second energy storage end 32, and there is a surplus of power, at this time, the first power supply end 11 can supply power with the third power end 23, that is, connect the second power supply end 12, combine the surplus power with the power introduced by the municipal power grid through the second power supply end 12, and supply power to other power utilization equipment in the building together, so that the maximum utilization of the power generated by the photovoltaic power generation system 40 can be realized, and the consumption of the power introduced by the municipal power grid is reduced to the greatest extent.

In one embodiment of the power system of the building, the first power supply terminal 11 has a lower priority for supplying power to the first energy storage terminal 31 than the first power supply terminal 21 and has a higher priority than the second energy storage terminal 32; the second energy storage terminal 32 is supplied with power in priority over the third electrical terminal 23 and inferior to the second electrical terminal 22.

Generally, the demand for power from the power consuming terminals 20 (primarily the first power terminal 21 and the second power terminal 22, excluding the third power terminal 23) is immediate and immediate, while the demand for power from the energy storage terminal 30 is continuous (before the energy storage device is full) but not immediate. In this embodiment, the priority of the first power supply end 11 for supplying power to the first energy storage end 31 is set to be lower than that of the first power end 21, and the priority of the first power supply end 11 for supplying power to the second energy storage end 32 is set to be lower than that of the second power end 22, so as to preferentially satisfy the power consumption requirements of the first power end 21 and the second power end 22, and supply power to the first energy storage end 31 and the second energy storage end 32 under the condition of satisfying the power consumption requirements of the first power end 21 and the second power end 22, thereby realizing reasonable distribution of power generated by the photovoltaic power generation system 40.

In this embodiment, the priority of the first power supply terminal 11 for supplying power to the first energy storage terminal 31 is set to be higher than that of the second energy storage terminal 32, that is, the cold accumulation module 52 is stored with energy preferentially, and after the power demand of the cold accumulation module 52 is met, the power demand of the storage battery 62 is met; when the power generated by the photovoltaic power generation system 40 is insufficient and cannot meet the power demand of the storage battery 62, the second power supply end 12 may specifically supply power to the second energy storage end 32 to charge and store energy in the storage battery 62, or the charging and energy storage of the storage battery 62 is stopped, and when the power generated by the photovoltaic power generation system 40 is sufficient, the power is supplied to the second energy storage end 32 to charge and store energy in the storage battery 62.

In this embodiment, after the power supply from the first power supply terminal 11 to the third power supply terminal 23 is inferior, the power supply from the first power supply terminal 11 to the first power supply terminal 21, the second power supply terminal 22, the first energy storage terminal 31 and the second energy storage terminal 32 is set, so that the power consumption requirements of the air conditioning module 51, the charging pile main body 61, the cold accumulation module 52 and the storage battery 62 can be preferentially guaranteed by the power generated by the photovoltaic power generation system 40, and after the power consumption requirements are met, the surplus power is combined with the power introduced by the municipal power grid to supply power to other power consumption equipment in the building, so that the power consumption requirements of the air conditioning module 51, the charging pile main body 61, the cold accumulation module 52 and the storage battery 62 are prevented from being influenced while the maximum utilization of the power generated by the photovoltaic power generation system 40 is realized.

In one embodiment of the power system of the building, the priority of the connection of the second power supply terminal 12 and the first power supply terminal 21 to supply power to the air conditioning module 51 is lower than the priority of the cold accumulation module 52 to supply the cold source to the air conditioning module 51.

In this embodiment, when the cold storage module 52 stores a cold source, if the power generated by the photovoltaic power generation system 40 is insufficient (for example, in a night environment), the cold source is provided to the air conditioning module 51 through the cold storage module 52, and the air conditioning module 51 adjusts the temperature of the indoor space according to the cold source input into the indoor space. In the process, the municipal power grid power introduced by the second power supply terminal 12 is not used, so that the consumption of the municipal power grid power can be reduced. When the cold source stored in the cold storage module 52 is consumed and cannot provide the cold source to the air conditioning module 51, or the cold source provided to the air conditioning module 51 cannot meet the demand, the second power supply end 12 is connected to the first power consumption end 21 to supply power to the air conditioning module 51, so as to meet the demand of the air conditioning module 51 for adjusting the temperature of the indoor space.

In one embodiment of a power system for a building, the power system includes a cooling load detection module for detecting a load demand of an indoor space for cooling. When the air conditioning module 51 adjusts the temperature of the indoor space, the main body providing energy to the air conditioning module 51 is selected among the first power supply terminal 11, the second power supply terminal 12, and the cold storage module 52 (the cold storage module 52 provides energy as a cold source, and the first power supply terminal 11 and the second power supply terminal 12 provide energy as power) by comprehensively referring to the power generated by the photovoltaic power generation system 40 and the detection result of the cooling load detection module, and the original main body is maintained or changed into a new main body. Specifically, the inventors of the present invention found that, in a unit time, the amount of cooling that the air conditioning module 51 can provide to the indoor space according to the cool source provided by the cool storage module 52 is smaller than the amount of cooling that the air conditioning module 51 can provide to the indoor space according to the power provided by the first power supply terminal 11 and the second power supply terminal 12. Therefore, when the refrigeration load of the indoor space is large, the cold accumulation module 52 is not used, or the cold accumulation module 52 is used less, and the air conditioning module 51 inputs cold energy to the indoor space mainly or completely according to the power provided by the first power supply terminal 11 or the second power supply terminal 12, so as to realize the rapid regulation of the temperature of the indoor space; when the refrigeration load of the indoor space is small, the first power supply end 11 and the second power supply end 12 are not used or reduced to supply power to the air conditioning module 51, the air conditioning module 51 mainly or completely inputs cold energy to the indoor space according to the cold source provided by the cold accumulation module 52, the consumption of the electric quantity provided by the first power supply end 11 and the second power supply end 12 is reduced, and the overall energy consumption of the electric power system of the building is reduced.

In the present embodiment, when the air conditioning module 51 operates in a mode of adjusting the temperature of the indoor space according to the cold storage module 52 providing the cold source, the first power supply terminal 11 and the second power supply terminal 12 are configured to:

if the refrigeration load of the indoor space is in the first interval, the first power supply end 11 and the second power supply end 12 do not supply power to the first power utilization end 21, and the cold accumulation module 52 provides a cold source for the air conditioning module 51;

if the refrigeration load of the indoor space is in the second interval, the first power supply end 11 or the second power supply end 12 supplies power to the first power utilization end 21, and the cold accumulation module 52 provides a cold source for the air conditioning module 51;

if the refrigeration load of the indoor space is in the third interval, the first power supply end 11 or the second power supply end 12 supplies power to the first power utilization end 21, and the cold accumulation module 52 does not provide a cold source for the air conditioning module 51;

the first interval is that the value of the refrigeration load of the indoor space exceeding the standard value is less than a first set value; the second interval is that the value of the refrigeration load of the indoor space exceeding the standard value is larger than the first set value and smaller than the second set value; the third interval is that the value of the refrigerating load of the indoor space exceeding the standard value is larger than the second set value.

In this embodiment, the cooling load of the indoor space may be determined according to the difference between the first temperature value Tn and the second temperature value T. The first temperature value Tn is used to represent a temperature value of the indoor space, and may be detected by a temperature sensor, for example, where the first temperature value Tn specifically represents a temperature value of the indoor space obtained by the nth detection; the second temperature value T is used to represent a temperature setting value of the air conditioning module 51 by a user, and the second temperature value T may be specifically obtained from the air conditioning module 51. In practice, the refrigeration load of the indoor space may be determined specifically according to a difference between a first temperature value Tn and a second temperature value T obtained through single detection, or may be determined according to a difference between a plurality of first temperature values Tn and second temperature values T obtained through multiple detections within a time period.

Taking the difference between the first temperature value Tn and the second temperature value T obtained by a single detection to determine the refrigeration load of the indoor space as an example, specifically, the first setting value may be set to 0, and the second setting value may be 5 degrees celsius, that is: when Tn-T is less than 0, the refrigeration load of the indoor space is in a first interval; when the temperature is more than or equal to 5 ℃ and more than Tn-T and more than 0, the refrigeration load of the indoor space is in a second interval; when Tn-T is higher than 5 deg.C, the refrigerating load of indoor space is in the third interval.

In addition to determining the cooling load of the indoor space by using the difference between the first temperature value Tn and the second temperature value T, other parameter objects may be used to determine the cooling load of the indoor space, or a plurality of parameter objects may be considered together to determine the cooling load of the indoor space. For example, on the basis of determining the cooling load of the indoor space from the above-described temperature difference, the cooling load of the indoor space can also be identified and determined more finely and accurately in conjunction with the number of persons in the indoor space.

Specifically, in this embodiment, when the refrigeration load of the indoor space is in the first interval, it is described that the refrigeration load of the indoor space is small, and in this case, the air conditioning module 51 can input the cold energy to the indoor space according to the cold source provided by the cold accumulation module 52, and thus the requirement for effective adjustment of the temperature of the indoor space can be satisfied, and therefore, the cold source is maintained to be provided to the air conditioning module 51 by the cold accumulation module 52, the first power supply terminal 11 and the second power supply terminal 12 do not supply power to the first power supply terminal 21, and the temperature of the indoor space is adjusted by the air conditioning module 51 by inputting the cold energy to the indoor space only according to the cold source provided by the cold accumulation module 52.

When the refrigeration load of the indoor space is in the second interval, it indicates that the refrigeration load of the indoor space is relatively large, and in this case, the air conditioning module 51 inputs cold energy to the indoor space according to the cold source provided by the cold accumulation module 52, and the requirement for effectively adjusting the temperature of the indoor space cannot be met, therefore, it is reduced that the cold accumulation module 52 provides the cold source for the air conditioning module 51, the first power supply end 11 or the second power supply end 12 supplies power to the first power supply end 21, the air conditioning module 51 generates cold energy according to the cold source provided by the cold accumulation module 52, and according to the power provided by the first power supply end 11 or the second power supply end 12, the cold energy is generated by combined action and is input to the indoor space to adjust the temperature of the indoor space. In this case, if the power generated by the photovoltaic power generation system 40 is sufficient, the first power supply terminal 11 supplies power to the first power supply terminal 21, and the second power supply terminal 12 does not supply power to the first power supply terminal 21; if the photovoltaic power generation system 40 generates less power and the power is not enough to meet the requirement of the first power consumption terminal 21, the second power supply terminal 12 supplies power to the first power consumption terminal 21. In this case, furthermore, it is also possible to control the compressor of the air conditioning module 51 to increase the operating frequency of the compressor so that the temperature of the indoor space can be adjusted more quickly.

When the refrigeration load of the indoor space is in the third interval, it is indicated that the refrigeration load of the indoor space is larger, in this case, the air conditioning module 51 needs to input the cold energy to the indoor space at the highest rate to meet the requirement for effective adjustment of the temperature of the indoor space, therefore, the cold accumulation module 52 stops providing the cold source for the air conditioning module 51, the first power supply terminal 11 or the second power supply terminal 12 supplies power to the first power supply terminal 21, and the air conditioning module 51 generates the cold energy completely according to the power supplied by the first power supply terminal 11 or the second power supply terminal 12 and inputs the cold energy to the indoor space to adjust the temperature of the indoor space. In this case, if the power generated by the photovoltaic power generation system 40 is sufficient, the first power terminal 21 is supplied with power from the first power supply terminal 11, and the first power terminal 21 is not supplied with power from the second power supply terminal 12; if the photovoltaic power generation system 40 generates less power and is not enough to meet the requirement of the first power terminal 21, the second power terminal 12 supplies power to the first power terminal 21. In this case, moreover, the compressor of the air conditioning module 51 may also be controlled to further increase the operating frequency of the compressor, so that the temperature of the indoor space can be adjusted more quickly.

In one embodiment of the power system of the building, the second interval may include a plurality of gears of the cooling load; on this basis, the first and second

electric terminals

21 and 22 are configured to:

in a gear with a low refrigeration load, the air conditioning module 51 has more cold energy input into the indoor space according to the cold source provided by the cold accumulation module 52, and the air conditioning module 51 has less cold energy generated according to the power supply of the first power supply terminal 11 or the second power supply terminal 12;

in the gear with a high refrigeration load, the amount of cold input into the indoor space by the air conditioning module 51 according to the cold source provided by the cold storage module 52 is small, and the amount of cold generated by the air conditioning module 51 according to the power supply of the first power supply terminal 11 or the second power supply terminal 12 is large.

According to the above configuration, as for the refrigeration load of the indoor space, in the range that the cold storage module 52 can satisfy, the air conditioning module 51 is preferentially used to generate cold according to the cold source provided by the cold storage module 52, and the cold is input to the indoor space; for the part which can not be satisfied by the cold accumulation module 52, the first power supply end 11 or the second power supply end 12 is used for supplying power to the air conditioning module 51, and the air conditioning module 51 generates cold energy according to the power to make up the part of the refrigeration load which can not be satisfied by the cold accumulation module 52. With such an arrangement, on the one hand, the consumption of the power supplied to the first power supply terminal 11 and the second power supply terminal 12 can be reduced as much as possible, and on the other hand, the cooling capacity input to the indoor space by the air conditioning module 51 can be ensured, so that the temperature of the indoor space can be quickly and timely adjusted.

In the above embodiment, the second interval may specifically include a first gear, a second gear, and a third gear in which the cooling load of the indoor space increases in sequence. For example, the refrigeration load in a scenario where the temperature of the indoor space is higher than the set temperature and the difference between the indoor space and the set temperature is 3 to 5 degrees celsius can be assigned to the third gear; the refrigeration load of the indoor space is assigned to a second gear in a scene that the temperature of the indoor space is higher than the set temperature and the difference between the indoor space and the set temperature is 1-3 ℃; and (3) enabling the temperature of the indoor space to be higher than the set temperature, and enabling the refrigeration load to be at a first gear under the scene that the difference value between the indoor space temperature and the set temperature is 0-1 ℃. On this basis, the first and second

electric terminals

11 and 12 may be configured to:

in the first gear, according to the power supply of the first power supply end 11 or the second power supply end 12, the ratio of the cold energy generated by the air conditioning module 51 and input into the indoor space is 25%, and according to the cold source provided by the cold accumulation module 52, the ratio of the cold energy generated by the air conditioning module 51 and input into the indoor space is 75%;

in the second gear, when the first power supply end 11 or the second power supply end 12 supplies power, the proportion of the cold energy generated by the air conditioning module 51 and input into the indoor space is 50%, and according to the cold source provided by the cold accumulation module 52, the proportion of the cold energy generated by the air conditioning module 51 and input into the indoor space is 50%;

in the third gear, the ratio of the cooling capacity generated by the air conditioning module 51 and input into the indoor space is 75% according to the power supplied by the first power supply terminal 11 or the second power supply terminal 12, and the ratio of the cooling capacity generated by the air conditioning module 51 and input into the indoor space is 25% according to the cooling source provided by the cold storage module 52.

In summary, in the power system of the building provided in the above embodiment of the present invention, by setting the priority order for the power demands of the first power end 21, the second power end 22, the first energy storage end 31, and the second energy storage end 32, when the power generated by the photovoltaic power generation system 40 is sufficient, the photovoltaic power generation system 40 can satisfy all the power demands of the first power end 21, the second power end 22, the first energy storage end 31, and the second energy storage end 32, so as to reduce the power introduced to the municipal power grid through the second power supply end 12, and reduce the power consumption to the municipal power grid. When the power generated by the photovoltaic power generation system 40 is limited, the photovoltaic power generation system 40 can supply power to the power demand with higher priority; for example, the first electric terminal 21 and the second electric terminal 22 have a more urgent demand for power supply, and accordingly, the energy storage terminal has a less urgent demand for power supply, so that the power supply to the first electric terminal 21 and the second electric terminal 22 can be mainly focused, the second power supply terminal 12 supplies power to the energy storage device connected to the energy storage terminal, or the power supply to the energy storage device is suspended; with this arrangement, on the one hand, the power generated by the photovoltaic power generation system 40 can be effectively and efficiently utilized, and on the other hand, the power consumption of the municipal power grid can be reduced. The time when the power generated by the photovoltaic power generation system 40 is extremely limited or even does not generate power is completely supplied to the first power utilization end 21, the second power utilization end 22, the first energy storage end 31 and the second energy storage end 32 by the second power supply end 12, so that the power utilization requirement is met, and the normal operation of the building depending on the power is ensured.

In an embodiment of the low energy consumption building of the present invention, the building comprises a photovoltaic power generation system, a cold storage air conditioning device, a charging pile device and the above power system.

The building of the invention, which comprises the power system, has the beneficial effects consistent with the power system, and is not described again.

In an embodiment of the power supply method based on the power system of the building described above, the power supply method includes the following steps, as shown in fig. 2.

Step S1, detecting whether the power supply quantity of the first power supply end meets the power load of the power utilization end connected with the first power supply end.

If so, maintaining the first power supply end to supply power to the power utilization end connected with the first power supply end; if not, executing step S2.

In step S1, the power terminals connected to the first power supply terminal 11 mainly refer to the first power terminal 21 and the second power terminal 22, that is, the air conditioning module 51 and the charging pile main body 61.

According to the step S1 and the step S2, when the first power supply terminal can satisfy the power load of the power consumption terminal connected thereto, the first power supply terminal supplies power to each power consumption terminal, and when the first power supply terminal cannot satisfy all the power consumption terminals, the first power supply terminal supplies power to the power consumption terminal with a higher priority, so that the consumption of the electric quantity of the municipal power grid introduced to the second power supply terminal can be avoided or reduced.

Further, if the detection result of step S1 is yes, step S3 is also executed.

And S3, connecting the first power supply end with the first energy storage end.

In step S3, when the power supply amount of the first power supply terminal 11 can satisfy the power load of the power consumption terminal connected thereto, it indicates that the power generated by the photovoltaic power generation system 40 is sufficient and surplus. In this embodiment, the power generated by the photovoltaic power generation system 40 is fully utilized, and the surplus power is transmitted to the first energy storage end 31, i.e., the cold storage module 52.

And S4, detecting whether the cold accumulation module is saturated or not.

According to the step S4, the first power supply terminal 11 is enabled to continuously supply power to the cold accumulation module 52 until the cold accumulation module 52 reaches the saturation state of stored energy.

Further, if the detection result of step S4 is yes, step S5 and step S6 are executed.

and S6, detecting whether the storage battery is saturated or not.

According to the steps S5 and S6, after the first power supply terminal 11 supplies power to the cold accumulation module 52 to the saturated state of stored energy, the remaining power is supplied to the second energy storage terminal 32, i.e. the storage battery 62, and the power is continuously supplied to the storage battery 62 to reach the saturated state of stored energy.

Further, if the detection result of step S6 is yes, step S7 is executed;

and S7, connecting the first power supply end with the second power supply end.

In step S7, after the first power supply terminal 11 charges the storage battery 62 to the energy storage saturation state, the surplus power is supplied to the internal power transmission network of the building through the second power supply terminal 12, and is used by the power consuming devices such as lighting devices in the building.

As described above, in the power supply method according to the present invention, the electric power generated by the photovoltaic power generation system 40 can be efficiently used, and the power consumption of the utility grid can be effectively reduced.

In the embodiment of the photovoltaic cold storage air conditioning apparatus of the present invention, as shown in fig. 3, the photovoltaic cold storage air conditioning apparatus includes a power supply module, an air conditioning module 51, a cold storage module 52, and a refrigeration load detection module 53. The power supply module comprises a photovoltaic power generation module and a mains supply access module; the photovoltaic power generation module is connected with the air conditioning module 51 and the cold accumulation module 52 and is used for supplying power to the air conditioning module 51 and the cold accumulation module 52; the commercial power access module is connected to the air conditioning module 51 and is used for supplying power to the air conditioning module 51. The cold accumulation module 52 is connected to the air conditioning module 51, and is used for providing a cold source to the air conditioning module 51. The air conditioning module 51 is connected to the indoor space, and is used for providing a cold source according to the power supply and/or cold accumulation module 52 of the power supply module, and adjusting the temperature of the indoor space. The refrigeration load detection module 53 is used for detecting the load requirement of the indoor space for refrigeration.

In this embodiment, when the air conditioning module 51 is operated in a mode in which the cold storage module 52 provides a cold source to the air conditioning module 51, the air conditioning module 51 is configured to:

if the refrigeration load of the indoor space is in the first interval, the air conditioning module 51 adjusts the temperature of the indoor space completely according to the cold source provided by the cold accumulation module 52;

if the refrigeration load of the indoor space is in the second interval, the air conditioning module 51 adjusts the temperature of the indoor space according to the cold source provided by the cold accumulation module 52 and the power supply of the photovoltaic power generation module or the commercial power access module;

if the refrigeration load of the indoor space is in the third interval, the air conditioning module 51 adjusts the temperature of the indoor space completely according to the power supplied by the photovoltaic power generation module or the commercial power access module.

Wherein, the first interval is that the value of the refrigeration load in the indoor space exceeding the standard value is less than a first set value; the second interval is that the value of the refrigeration load of the indoor space exceeding the standard value is larger than the first set value and smaller than the second set value; the third interval is that the value of the refrigerating load of the indoor space exceeding the standard value is larger than the second set value.

In this embodiment, the refrigeration load of the indoor space is detected by the refrigeration load detection module 53, when the refrigeration load is in the first interval and the refrigeration load is low, the air conditioning module 51 adjusts the temperature of the indoor space completely according to the cold source provided by the cold storage module 52, on one hand, the requirement on the temperature adjustment of the indoor space can be effectively met, on the other hand, the power supply of the photovoltaic power generation module and the mains supply access module is not relied on, the requirement on the adjustment of the indoor space can be maintained when the photovoltaic power generation module generates less or no power, and the consumption of the power introduced by the municipal power grid is reduced. When the refrigeration load is in the second interval and the refrigeration load is relatively high, the cold energy input into the indoor space by the cold accumulation module 52 alone cannot meet the requirement of regulating the temperature of the indoor space, so that under the condition, the air conditioning module 51 can generate more cold energy in unit time according to the cold energy generated by the cold accumulation module 52 and the cold energy generated by the power supply of the photovoltaic power generation module or the commercial power access module, and the two parts of cold energy are input into the indoor space, and the temperature of the indoor space can be regulated timely and effectively. When the refrigeration load is in the third interval and the refrigeration load is higher, the air conditioning module 51 generates power completely according to the power supply of the photovoltaic power generation module or the commercial power access module, and can generate larger cooling capacity in unit time to be input into the indoor space, so that the requirement of temperature regulation on the indoor space with larger refrigeration load is met.

In one embodiment of the photovoltaic cold storage air conditioning apparatus, the second interval comprises a plurality of gears of the refrigeration load; on this basis, the air conditioning module 51 is configured to:

when the refrigeration load is low, the air conditioning module 51 has more cold energy input into the indoor space according to the cold source provided by the cold accumulation module 52, and the air conditioning module 51 has less cold energy generated according to the power supply of the photovoltaic power generation module or the commercial power access module; when the refrigeration load is high, the amount of cold input into the indoor space by the air conditioning module 51 according to the cold source provided by the cold storage module 52 is small, and the amount of cold generated by the air conditioning module 51 according to the power supply of the photovoltaic power generation module or the commercial power access module is large.

In this embodiment, according to the gear size of the refrigeration load of the indoor space, when the refrigeration load is low, more of the air conditioning module 51 generates the cooling capacity according to the cold storage module 52 and inputs the cooling capacity into the indoor space, and the difference between the cooling capacity and the refrigeration load is less, and the difference is generated by the air conditioning module 51 according to the power supply of the photovoltaic power generation module or the commercial power access module, so that the consumption of the power supply of the photovoltaic power generation module or the commercial power access module is reduced to a greater extent. When the refrigeration load is higher, the air conditioning module 51 generates less cold according to the cold accumulation module 52, and the difference between the cold accumulation module and the refrigeration load is larger, so that more cold generated by the air conditioning module 51 according to the power supply of the photovoltaic power generation module or the commercial power access module is input into the indoor space, more energy can be generated in unit time, and the requirement of adjusting the temperature of the indoor space is met.

Specifically, in one embodiment of the photovoltaic cold-storage air conditioning equipment, the second interval may specifically include a first gear, a second gear and a third gear in which the cooling load of the indoor space increases in sequence. On this basis, the air conditioning module 51 is configured to:

in the first gear, according to the power supply of the photovoltaic power generation module or the commercial power access module, the proportion of the cold energy generated by the air conditioning module 51 and input into the indoor space is 25%, and according to the cold source provided by the cold accumulation module 52, the proportion of the cold energy generated by the air conditioning module 51 and input into the indoor space is 75%;

in the second gear, according to the power supply of the photovoltaic power generation module or the commercial power access module, the proportion of the cold energy generated by the air conditioning module 51 and input into the indoor space is 50%, and according to the cold source provided by the cold accumulation module 52, the proportion of the cold energy generated by the air conditioning module 51 and input into the indoor space is 50%;

in the third gear, the ratio of the cold energy generated by the air conditioning module 51 and input into the indoor space is 75% according to the power supply of the photovoltaic power generation module or the commercial power access module, and the ratio of the cold energy generated by the air conditioning module 51 and input into the indoor space is 25% according to the cold source provided by the cold accumulation module 52.

Specifically, in this embodiment, the refrigeration load detection module is configured to detect a temperature of the indoor space, and determine the refrigeration load of the indoor space according to a difference between the temperature of the indoor space and a set temperature. On this basis, for example, the following settings can be made: if the temperature of the indoor space is higher than the set temperature and the difference value between the indoor space and the set temperature is more than 5 ℃, the refrigeration load is in a third gear; if the temperature of the indoor space is higher than the set temperature and the difference value between the indoor space and the set temperature is 3-5 ℃, the refrigeration load is in a second gear; and if the temperature of the indoor space is higher than the set temperature and the difference value between the indoor space and the set temperature is 1-3 ℃, the refrigeration load is in a first gear.

In summary, according to the photovoltaic cold storage air conditioning equipment provided by the invention, the refrigeration load of the indoor space is detected by the refrigeration load detection module, when the refrigeration load is in the first interval and the refrigeration load is low, the air conditioning module completely adjusts the temperature of the indoor space according to the cold source provided by the cold storage module, so that the requirement on the temperature adjustment of the indoor space can be effectively met, and the requirement on the adjustment of the indoor space can be maintained in the time when the photovoltaic power generation module generates less or no power without depending on the power supply of the photovoltaic power generation module and the mains supply access module, thereby reducing the consumption of the power introduced by the municipal power grid. When the refrigeration load is in the second interval and the refrigeration load is relatively high, the cold energy input into the indoor space by the cold accumulation module alone cannot meet the requirement for adjusting the temperature of the indoor space, therefore, under the condition, the air conditioning module not only generates cold energy according to the cold source provided by the cold accumulation module, but also generates cold energy according to the power supply of the photovoltaic power generation module or the commercial power access module, and can generate more cold energy in unit time, so that the two parts of cold energy are input into the indoor space, and the temperature of the indoor space can be effectively adjusted in time. When the refrigeration load is in the third interval and the refrigeration load is higher, the air conditioning module generates power completely according to the power supply of the photovoltaic power generation module or the commercial power access module, and can generate larger cooling capacity in unit time to be input into the indoor space, so that the requirement on temperature regulation of the indoor space with larger refrigeration load is met.

In one embodiment of the control method of the photovoltaic cold storage air conditioning equipment, the control method comprises the following steps, as shown in fig. 4.

The method comprises the following steps that S1, under the condition that an air conditioning module operates in a mode of adjusting the temperature of an indoor space according to a cold source provided by a cold accumulation module, the load requirement of the indoor space on refrigeration is detected;

if the cooling load of the indoor space is in the first section, step S2 is performed. If the cooling load of the indoor space is in the second section, step S3 is executed. If the cooling load of the indoor space is in the third section, step S4 is executed.

In step S1, when detecting a cooling load demand of the indoor space, the temperature of the indoor space may be specifically detected, and the cooling load of the indoor space may be determined according to a difference between the temperature of the indoor space and a set temperature.

And S2, controlling the air conditioning module to completely regulate the temperature of the indoor space according to the cold source provided by the cold accumulation module.

And S3, controlling the air conditioning module to regulate the temperature of the indoor space according to the cold source provided by the cold accumulation module and the power supply of the photovoltaic power generation module or the commercial power access module.

And S4, controlling the air conditioning module to regulate the temperature of the indoor space completely according to the power supply of the photovoltaic power generation module or the commercial power access module.

In the above embodiment, the first interval is that the value of the refrigeration load of the indoor space exceeding the standard value is smaller than the first set value; the second interval is that the value of the refrigeration load of the indoor space exceeding the standard value is larger than the first set value and smaller than the second set value; the third interval is that the value of the refrigerating load of the indoor space exceeding the standard value is larger than the second set value.

Specifically, the values of the first set value and the second set value may be determined by combining various factors as needed. For example, in the case where the cooling load is expressed as the difference between the temperature of the indoor space and the set temperature, the value of the first set value may be taken as 0, and the value of the second set value may be taken as 5 ℃.

In one embodiment, the second interval includes a plurality of gear positions of the cooling load; on this basis, the control method further includes the following steps S31 and S32, as shown in fig. 5.

In step S31, the gear position of the cooling load is detected.

In step S31, the gear of the cooling load of the indoor space may be determined based on the detection data in step S1, or may be determined based on an independent detection process.

Specifically, in the case where the second interval includes the first gear, the second gear, and the third gear in which the cooling load of the indoor space sequentially increases by detecting the temperature of the indoor space and determining the cooling load of the indoor space according to the difference between the temperature of the indoor space and the set temperature, for example, if the temperature of the indoor space is higher than the set temperature and the difference from the set temperature is greater than 5 degrees celsius, the cooling load is in the third gear; if the temperature of the indoor space is higher than the set temperature and the difference value between the indoor space and the set temperature is 3-5 ℃, the refrigeration load is in a second gear; and if the temperature of the indoor space is higher than the set temperature and the difference value between the indoor space and the set temperature is 1-3 ℃, the refrigeration load is in a first gear.

Step S32, when the refrigeration load is low, controlling the air conditioning module to input more cold energy into the indoor space according to the cold source provided by the cold accumulation module, and controlling the air conditioning module to generate less cold energy according to the power supply of the photovoltaic power generation module or the commercial power access module; and when the refrigeration load is high, the air conditioning module is controlled to input less cold energy into the indoor space according to the cold source provided by the cold accumulation module, and the air conditioning module generates more cold energy according to the power supply of the photovoltaic power generation module or the commercial power access module.

For example, in step S32, if the detection result indicates that the refrigeration load is in the first gear, the air conditioning module is controlled to generate and input 25% of the cooling capacity into the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module, and the air conditioning module is controlled to generate and input 75% of the cooling capacity into the indoor space according to the cooling capacity provided by the cold storage module; if the detection result is that the refrigeration load is in a second gear, controlling the air conditioning module to generate and input 50% of the cold energy into the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module, and controlling the air conditioning module to generate and input 50% of the cold energy into the indoor space according to the cold source provided by the cold accumulation module; and if the detection result is that the refrigeration load is in a third gear, controlling the air conditioning module to generate and input cold energy into the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module to account for 75%, and controlling the air conditioning module to generate and input cold energy into the indoor space according to the cold source provided by the cold accumulation module to account for 25%.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The above description is merely illustrative of particular embodiments of the invention that enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric power system of a building, characterized in that the electric power system comprises a power supply end, a power utilization end and an energy storage end;

the power supply end comprises a first power supply end and a second power supply end, the first power supply end is connected with the photovoltaic power generation system, and the second power supply end is a mains supply access end;

the power utilization end is used for being connected with power utilization equipment in a building and transmitting power; the electric equipment in the building comprises cold accumulation air-conditioning equipment and charging pile equipment; the cold accumulation air conditioning equipment comprises an air conditioning module and a cold accumulation module, and the charging pile equipment comprises a storage battery;

the power utilization end comprises a first power utilization end, a second power utilization end and a third power utilization end; the first power utilization end is connected with an air conditioning module of the cold accumulation air conditioning equipment, the second power utilization end is connected with the charging pile equipment, and the third power utilization end is connected with the second power supply end;

the energy storage end comprises a first energy storage end and a second energy storage end, the first energy storage end is connected with a cold accumulation module of the cold accumulation air conditioning equipment, and the second energy storage end is connected with a storage battery of the charging pile equipment;

the first power supply end and the second power supply end are connected with the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end in a switchable manner and supply power to the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end, and the priority of the power supply of the first power supply end to the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end is higher than that of the second power supply end;

the first power supply end supplies power to the first power utilization end, the second power utilization end, the first energy storage end and the second energy storage end in a set priority order.

2. The electrical power system of claim 1, wherein the first power terminal prioritizes power to the first power terminal over the second power terminal and the second power terminal over the third power terminal.

3. The power system of the building according to claim 1, wherein the first power supply terminal has a priority over the first energy storage terminal in power supply to the first power utilization terminal, and has a priority over the second energy storage terminal; the priority of supplying power to the second energy storage end is prior to the third power end and is inferior to the second power end.

4. The electrical power system of claim 1, wherein the second power supply terminal is connected to the first power terminal to supply power to the air conditioning module with a lower priority than the cold storage module provides a cold source to the air conditioning module.

5. The electrical power system of a building of claim 1, wherein the electrical power system includes a refrigeration load detection module for detecting a load demand of the indoor space for refrigeration;

in a mode in which the air conditioning module operates to adjust the temperature of the indoor space according to the cold storage module providing the cold source, the first and second power supply terminals are configured to:

6. The building power system according to claim 5, wherein the second section includes a plurality of stages of cooling loads;

the first and second electrical terminals are configured to:

under the gear with low refrigeration load, the air conditioning module has more cold energy input into the indoor space according to the cold source provided by the cold accumulation module, and the air conditioning module generates less cold energy according to the power supply of the first power supply end or the second power supply end;

7. The electric power system of the building according to claim 6, wherein the second section includes a first gear, a second gear, and a third gear in which a cooling load of the indoor space increases in this order;

the first and second electrical terminals are configured to:

in a first gear, according to the power supply of the first power supply end or the second power supply end, the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 25%, and according to the cold source provided by the cold accumulation module, the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 75%;

in the second gear, the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 50% according to the power supply of the first power supply end or the second power supply end, and the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 50% according to the cold source provided by the cold accumulation module;

in the third gear, according to the power supply of the first power supply end or the second power supply end, the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 75%, and according to the cold source provided by the cold accumulation module, the ratio of the cold energy generated by the air conditioning module and input into the indoor space is 25%.

8. A building with low energy consumption, characterized in that it comprises a photovoltaic power generation system, a cold storage air conditioning device, a charging pile device and a power system according to any one of claims 1 to 7.

9. A power supply method for a power system of a building according to claims 1 to 7, characterized in that the power supply method comprises:

the method comprises the following steps that S1, whether the power supply quantity of a first power supply end meets the power load of a power utilization end connected with the first power supply end is detected;

and S2, according to the priority sequence of the first power supply end for supplying power to the first power utilization end, the second power utilization end and the third power utilization end, the connection of the first power supply end to the power utilization end with the later priority is sequentially stopped, and power is supplied to the second power supply end until the first power supply end can meet the power utilization load of the power utilization end connected with the first power supply end.

10. The power supply method according to claim 9, wherein if the detection result of step S1 is yes, step S3 is further executed;

s3, connecting the first power supply end with the first energy storage end;

s4, detecting whether the cold accumulation module is saturated or not;

11. The power supply method according to claim 10, wherein if the detection result of step S4 is yes, step S5 is executed;

step S6, detecting whether the storage battery is saturated or not;

12. The power supply method according to claim 11, wherein if the detection result of step S6 is yes, step S7 is executed;

and S7, connecting the first power supply end with the second power supply end.

13. The photovoltaic cold accumulation air conditioning equipment is characterized by comprising a power supply module, an air conditioning module, a cold accumulation module and a refrigeration load detection module;

the power supply module comprises a photovoltaic power generation module and a mains supply access module; the photovoltaic power generation module is connected with the air conditioning module and the cold accumulation module and used for supplying power to the air conditioning module and the cold accumulation module; the commercial power access module is connected with the air conditioning module and used for supplying power to the air conditioning module;

the cold accumulation module is connected with the air conditioning module and is used for providing a cold source for the air conditioning module;

the air conditioning module is connected with the indoor space and used for adjusting the temperature of the indoor space according to the power supply of the power supply module and/or the cold accumulation module to provide a cold source;

the refrigeration load detection module is used for detecting the load requirement of the indoor space on refrigeration;

when the air conditioning module is operated in a mode in which the cold storage module provides a cold source for the air conditioning module, the air conditioning module is configured to:

if the refrigeration load of the indoor space is in a third interval, the air conditioning module completely adjusts the temperature of the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module;

14. The pv cold storage air conditioning apparatus according to claim 13 wherein the second interval includes a plurality of cooling load steps;

the air conditioning module is configured to:

15. The photovoltaic cold-storage air conditioning equipment as claimed in claim 14, wherein the second interval comprises a first gear, a second gear and a third gear in which the cooling load of the indoor space is increased in sequence;

the air conditioning module is configured to:

in the first gear, according to the power supply of the photovoltaic power generation module or the commercial power access module, the cold energy generated by the air conditioning module and input into the indoor space accounts for 25%, and according to the cold source provided by the cold accumulation module, the cold energy generated by the air conditioning module and input into the indoor space accounts for 75%;

16. The pv cold storage air conditioning apparatus according to claim 15 wherein the cooling load detection module is configured to detect a temperature of the indoor space and determine a cooling load of the indoor space according to a difference between the temperature of the indoor space and a set temperature;

17. A control method of a photovoltaic cold storage air conditioning device is characterized by comprising the following steps:

detecting the load demand of the indoor space for refrigeration under the condition that the air conditioning module operates in a mode of adjusting the temperature of the indoor space according to the cold source provided by the cold accumulation module;

if the refrigeration load of the indoor space is in a first interval, controlling the air conditioning module to completely adjust the temperature of the indoor space according to the cold source provided by the cold accumulation module;

if the refrigeration load of the indoor space is in a second interval, controlling the air conditioning module to adjust the temperature of the indoor space according to the cold source provided by the cold accumulation module and the power supply of the photovoltaic power generation module or the commercial power access module;

the first interval is that the value of the refrigeration load in the indoor space which exceeds a standard value is smaller than a first set value; the second interval is that the value of the refrigeration load of the indoor space exceeding the standard value is larger than the first set value and smaller than the second set value; and the third interval is that the value of the refrigeration load of the indoor space exceeding the standard value is greater than the second set value.

18. The control method of a photovoltaic cold storage air conditioning apparatus according to claim 17, characterized in that the second section includes a plurality of gear positions of the cooling load; the control method further comprises the following steps:

detecting a gear of a refrigeration load;

19. The control method of the photovoltaic cold storage air conditioning equipment, according to claim 18, characterized in that the second section includes a first gear, a second gear and a third gear in which the cooling load of the indoor space increases in sequence;

if the detection result is that the refrigeration load is in a first gear, the air conditioning module is controlled to generate and input 25% of cold energy into the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module, and the air conditioning module is controlled to generate and input 75% of cold energy into the indoor space according to the cold source provided by the cold accumulation module;

and if the detection result is that the refrigeration load is in a third gear, controlling the air conditioning module to generate and input the cold energy into the indoor space according to the power supply of the photovoltaic power generation module or the commercial power access module to account for 75%, and controlling the air conditioning module to generate and input the cold energy into the indoor space according to the cold source provided by the cold accumulation module to account for 25%.

20. The control method of a photovoltaic cold storage air conditioning apparatus according to claim 19, characterized in that in detecting a cooling load demand of an indoor space, a temperature of the indoor space is detected, and a cooling load of the indoor space is determined according to a difference between the temperature of the indoor space and a set temperature;