Photovoltaic power supply system and low-temperature starting, high-temperature heat dissipation, and low-temperature operation method thereof

Abstract

The present invention provides a photovoltaic power supply system and its low-temperature startup, high-temperature heat dissipation, and low-temperature operation methods, belonging to the field of photovoltaic power generation technology. The system includes: a photovoltaic module, a photovoltaic integrated machine, an energy storage battery pack, a low-temperature heating module, and a high-temperature heat dissipation module; when the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is less than a low-temperature threshold, the photovoltaic module supplies direct current to the low-temperature heating module; the low-temperature heating module is used to supply heat to the photovoltaic integrated machine and the energy storage battery pack to start the photovoltaic integrated machine and the energy storage battery pack; when the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is greater than a high-temperature threshold, the photovoltaic integrated machine supplies alternating current to the high-temperature heat dissipation module; and the high-temperature heat dissipation module is used to dissipate heat from the photovoltaic integrated machine and the energy storage battery pack. The present invention solves the problem of photovoltaic power supply systems operating in a wide temperature range environment and improves the efficient and reliable operation of photovoltaic power supply systems in high and low temperature zones.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a photovoltaic power supply system and a method for low-temperature starting, high-temperature heat dissipation, and low-temperature operation thereof. Background Art

[0002] Photovoltaic power systems have difficulty starting at ultra-low temperatures and operating in wide temperature ranges. In particular, photovoltaic integrated devices and energy storage battery packs have difficulty starting and operating in ultra-low temperature conditions. First, the photovoltaic power system needs to be heated overall and locally to meet startup conditions. However, when the photovoltaic power system is not started, it cannot generate electricity internally for self-heating, and it cannot be heated with external power sources in the wild. The only way to achieve overall heating of the photovoltaic power system and start the system is to use the power of photovoltaic modules. At the same time, in low-temperature conditions, when there is abundant sunlight, it needs to be fully utilized or stored, which requires local heating of the energy storage battery pack to make it chargeable and dischargeable. Furthermore, when operating at high temperatures, electrical appliances and energy storage battery packs are unsafe, requiring the photovoltaic power system to dissipate heat and cool down.

[0003] Therefore, there is an urgent need to provide a photovoltaic power supply system and its low-temperature starting, high-temperature heat dissipation, and low-temperature operation method to achieve low-temperature self-starting and high-temperature heat dissipation of the photovoltaic power supply system. Summary of the Invention

[0004] In view of this, it is necessary to provide a photovoltaic power supply system and its low-temperature starting, high-temperature heat dissipation, and low-temperature operation method to solve the technical problems in the existing technology that the photovoltaic power supply system relies on external power supply heating to start at ultra-low temperature and cannot dissipate heat at high temperature, resulting in the poor applicability of the photovoltaic power supply system.

[0005] In order to solve the above problems, the present invention provides a photovoltaic power supply system, comprising: a photovoltaic module, a photovoltaic integrated machine, an energy storage battery pack, a low-temperature heating module and a high-temperature heat dissipation module;

[0006] The photovoltaic module is used to convert light energy into direct current;

[0007] The photovoltaic integrated machine is used to adjust the parameters of the direct current to obtain alternating current;

[0008] The energy storage battery pack is used to store the direct current;

[0009] The photovoltaic assembly is further configured to supply direct current to the low-temperature heating module when the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is lower than a low-temperature threshold;

[0010] The low-temperature heating module is used to provide heat for the photovoltaic integrated machine and the energy storage battery pack to start the photovoltaic integrated machine and the energy storage battery pack;

[0011] The photovoltaic integrated machine is used to supply AC power to the high-temperature heat dissipation module when the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is greater than a high-temperature threshold;

[0012] The high-temperature heat dissipation module is used to dissipate heat for the photovoltaic integrated machine and the energy storage battery pack.

[0013] In one possible implementation, the low-temperature heating module includes a first temperature-controlled switch and a DC heater; the first temperature-controlled switch is respectively connected to the DC heater, the outlet of the photovoltaic module, and the off-grid interface of the photovoltaic integrated machine; the low-temperature threshold includes a first low-temperature threshold;

[0014] The first temperature-controlled switch is used to close when the photovoltaic integrated machine and the energy storage battery pack are in the heating stage and the real-time temperature is lower than the first low-temperature threshold, so that the photovoltaic assembly supplies DC power to the DC heater; and to disconnect when the real-time temperature is greater than or equal to the first low-temperature threshold.

[0015] In a possible implementation, the low temperature threshold further includes a second low temperature threshold;

[0016] The first temperature control switch is further configured to disconnect when the photovoltaic integrated machine and the energy storage battery pack are in a cooling stage and the real-time temperature is greater than or equal to a second temperature threshold; and close when the real-time temperature is less than the second temperature threshold;

[0017] The second temperature threshold is lower than the first temperature threshold.

[0018] In a possible implementation, the high-temperature heat dissipation module further includes a second temperature control switch and a heat dissipation fan; the second temperature control switch is respectively connected to the heat dissipation fan and the off-grid interface of the photovoltaic integrated machine; the high temperature threshold includes a first high temperature threshold;

[0019] The second temperature control switch is used to disconnect when the photovoltaic integrated machine and the energy storage battery pack are in the heating stage and the real-time temperature is less than a first high temperature threshold; and close when the photovoltaic integrated machine and the energy storage battery pack are in the heating stage and the real-time temperature is greater than or equal to the first high temperature threshold, so that the photovoltaic integrated machine supplies AC power to the cooling fan.

[0020] In a possible implementation, the high temperature threshold further includes a second high temperature threshold;

[0021] The second temperature-controlled switch is further configured to close when the photovoltaic integrated machine and the energy storage battery pack are in a cooling stage and the real-time temperature is greater than or equal to a second high temperature threshold; and to disconnect when the photovoltaic integrated machine and the energy storage battery pack are in a cooling stage and the real-time temperature is less than the second high temperature threshold;

[0022] The second high temperature threshold is lower than the first high temperature threshold.

[0023] The present invention further provides a low-temperature starting method for a photovoltaic power supply system, wherein the photovoltaic power supply system is the photovoltaic power supply system described in any one of the possible implementations above, and the low-temperature starting method for the photovoltaic power supply system comprises:

[0024] Determine whether the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is lower than the low temperature threshold;

[0025] When the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is lower than the low temperature threshold, the photovoltaic assembly supplies direct current to the low-temperature heating module so that the low-temperature heating module provides heat to the photovoltaic integrated machine and the energy storage battery pack.

[0026] The present invention further provides a high-temperature heat dissipation method for a photovoltaic power system, wherein the photovoltaic power system is the photovoltaic power system described in any one of the possible implementations above, and the high-temperature heat dissipation method for the photovoltaic power system comprises:

[0027] Determine whether the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is greater than the high temperature threshold;

[0028] When the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is greater than a high temperature threshold, the photovoltaic integrated machine supplies AC power to the high-temperature heat dissipation module so that the high-temperature heat dissipation module dissipates heat for the photovoltaic integrated machine and the energy storage battery pack.

[0029] The present invention further provides a low-temperature operation method for a photovoltaic power system, wherein the photovoltaic power system is the photovoltaic power system described in any one of the possible implementations above, and the low-temperature operation method for the photovoltaic power system comprises:

[0030] Obtaining a first power of the photovoltaic assembly, a heating power of the energy storage battery pack, an output power of the energy storage battery pack, a load power, and a battery pack temperature of the energy storage battery pack;

[0031] When the battery pack temperature is greater than or equal to zero degrees and less than or equal to a preset temperature, determining whether the load power is zero and whether the first power is less than or equal to the heating power;

[0032] When the load power is zero and the first power is less than or equal to the heating power, the photovoltaic integrated machine is controlled to charge the energy storage battery pack with the first power, and the electric energy generated by the photovoltaic assembly is only used to heat the energy storage battery pack, and the energy storage battery pack is not charged;

[0033] When the load power is zero and the first power is greater than the heating power, the photovoltaic integrated machine is controlled to charge the energy storage battery pack with a power equal to the heating power, and the electric energy generated by the photovoltaic assembly is only used to heat the energy storage battery pack, and is not used to charge the energy storage battery pack;

[0034] When the load power is not zero, the load power is controlled to be the sum of the first power and the output power, and the photovoltaic assembly and the energy storage battery group jointly output electrical energy.

[0035] The beneficial effects of the present invention are as follows: the photovoltaic power supply system provided by the present invention includes a low-temperature heating module, and when the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is lower than the low-temperature threshold, the photovoltaic assembly can supply direct current to the low-temperature heating module, so as to power the photovoltaic integrated machine and the energy storage battery pack through the low-temperature heating module, thereby realizing low-temperature self-starting of the photovoltaic power supply system without relying on an external heating source, being convenient for outdoor use, and improving the applicability of the photovoltaic power supply system. Moreover, the photovoltaic power supply system can heat the photovoltaic integrated machine and the energy storage battery pack as long as there is sunlight, so that the photovoltaic power supply system can be started in any low-temperature environment, thereby improving the power efficiency of the photovoltaic power supply system.

[0036] Furthermore, the present invention configures the photovoltaic integrated machine to supply AC power to the high-temperature heat dissipation module when the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is greater than a high-temperature threshold; so that the high-temperature heat dissipation module dissipates heat for the photovoltaic integrated machine and the energy storage battery pack, thereby achieving high-temperature heat dissipation, thereby ensuring that the photovoltaic power supply system operates efficiently and reliably in a wide temperature range.

[0037] Furthermore, the photovoltaic modules, photovoltaic integrated machine, energy storage battery pack, low-temperature heating module and high-temperature heat dissipation module are all independent modules, that is, temperature control and power generation are independent of each other and do not affect each other, thereby improving the safety and reliability of the photovoltaic power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of an embodiment of the photovoltaic power supply system provided by the present invention;

[0039] Figure 2 A schematic flow chart of an embodiment of a low-temperature heating method for a photovoltaic power system provided by the present invention;

[0040] Figure 3 A schematic flow chart of an embodiment of a high-temperature heat dissipation method for a photovoltaic power system provided by the present invention;

[0041] Figure 4 This is a flow chart of an embodiment of the low-temperature operation method of the photovoltaic power system provided by the present invention. DETAILED DESCRIPTION

[0042] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0043] It should be understood that the schematic drawings are not drawn to scale. The flowcharts used in the present invention illustrate operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flowcharts can be implemented out of sequence, and steps that have no logical contextual relationship can be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of the present invention, can add one or more other operations to the flowcharts or remove one or more operations from the flowcharts. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0044] In the description of the embodiments of the present invention, the terms "connect," "install," "fix," "dispose," and "have" are to be understood in a broad sense. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] The present invention provides a photovoltaic power supply system and its low-temperature starting, high-temperature heat dissipation, and low-temperature operation methods, which are respectively described below.

[0046] Figure 1 A schematic diagram of a photovoltaic power supply system according to an embodiment of the present invention is shown in FIG. Figure 1 As shown, the photovoltaic power supply system 10 includes: a photovoltaic module 100, a photovoltaic integrated machine 200, an energy storage battery pack 300, a low-temperature heating module 400 and a high-temperature heat dissipation module 500;

[0047] The photovoltaic module 100 is used to convert light energy into direct current;

[0048] The photovoltaic integrated machine 200 is used to adjust the parameters of direct current to obtain alternating current;

[0049] The energy storage battery pack 300 is used to store direct current;

[0050] The photovoltaic assembly 100 is also used to supply direct current to the low-temperature heating module 400 when the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery group 300 is lower than the low-temperature threshold;

[0051] The low-temperature heating module 400 is used to provide heat for the photovoltaic integrated machine 200 and the energy storage battery pack 300 to start the photovoltaic integrated machine 200 and the energy storage battery pack 300;

[0052] The photovoltaic integrated machine 200 is used to supply AC power to the high-temperature heat dissipation module 500 when the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery group 300 is greater than the high-temperature threshold;

[0053] The high-temperature heat dissipation module 500 is used to dissipate heat for the photovoltaic integrated machine 200 and the energy storage battery pack 300.

[0054] Among them, the low temperature threshold and the high temperature threshold can be set or adjusted according to the actual application scenario and are not specifically limited here.

[0055] Compared with the prior art, the photovoltaic power supply system 10 provided by the present invention, by providing the photovoltaic power supply system 10 including a low-temperature heating module 400, can supply direct current to the low-temperature heating module 400 through the photovoltaic component 100 when the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 is lower than the low-temperature threshold, so as to power the photovoltaic integrated machine 200 and the energy storage battery pack 300 through the low-temperature heating module 400, thereby realizing low-temperature self-starting of the photovoltaic power supply system 10 without relying on an external heating source, being convenient for outdoor use, and improving the applicability of the photovoltaic power supply system 10, and the photovoltaic power supply system 10 can heat the photovoltaic integrated machine 200 and the energy storage battery pack 300 as long as there is sunlight, so that the photovoltaic power supply system 10 can be started in any low-temperature environment, thereby improving the power efficiency of the photovoltaic power supply system 10.

[0056] Furthermore, the present invention configures the photovoltaic integrated machine 200 to supply AC power to the high-temperature heat dissipation module 500 when the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 is greater than a high-temperature threshold; so that the high-temperature heat dissipation module 500 dissipates heat for the photovoltaic integrated machine 200 and the energy storage battery pack 300, thereby achieving high-temperature heat dissipation, thereby ensuring that the photovoltaic power supply system 10 operates efficiently and reliably in a wide temperature range.

[0057] Furthermore, the photovoltaic assembly 100, the photovoltaic integrated machine 200, the energy storage battery pack 300, the low-temperature heating module 400, and the high-temperature heat dissipation module 500 are independent modules, that is, temperature control and power generation are independent of each other and do not affect each other, thereby improving the safety and reliability of the photovoltaic power supply system.

[0058] In some embodiments of the present invention, Figure 1 As shown, the low-temperature heating module 400 includes a first temperature control switch 410 and a DC heater 420; the first temperature control switch 410 is respectively connected to the DC heater 420, the outlet of the photovoltaic module 100 and the off-grid interface of the photovoltaic integrated machine 200; the low-temperature threshold includes a first low-temperature threshold;

[0059] The first temperature control switch 410 is used to close when the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the heating stage and the real-time temperature is less than the first low-temperature threshold, so that the photovoltaic assembly 100 supplies DC power to the DC heater 220; and disconnect when the real-time temperature is greater than or equal to the first low-temperature threshold.

[0060] When the real-time temperature is greater than or equal to the first low temperature threshold, the photovoltaic integrated machine 100 provides AC power to the first temperature control switch 410 to cause the first temperature control switch 410 to be disconnected.

[0061] The photovoltaic integrated machine 100 is a device that integrates a charge and discharge controller, an inverter and other devices.

[0062] In some embodiments of the present invention, the low temperature threshold further includes a second low temperature threshold;

[0063] The first temperature control switch 410 is further configured to disconnect when the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the cooling stage and the real-time temperature is greater than or equal to the second low-temperature threshold; and close when the real-time temperature is less than the second low-temperature threshold;

[0064] The second low temperature threshold is lower than the first low temperature threshold.

[0065] The embodiment of the present invention sets the first low temperature threshold and the second low temperature threshold to be respectively adapted to the photovoltaic power system 10 in the heating stage and the cooling stage, which is more targeted and reasonable, and improves the control precision and accuracy of the low temperature heating module 400.

[0066] In one specific embodiment, the first temperature-controlled switch 410 is a normally closed switch. In a low-temperature environment, electrical appliances such as the photovoltaic integrated device 200 and the energy storage battery pack 300 cannot operate. The first temperature-controlled switch 410 is not powered, and the photovoltaic assembly 100 generates DC power, which is supplied to the DC heater 420 through the first temperature-controlled switch 410. The DC heater 420 heats the photovoltaic integrated device 200 and the energy storage battery pack 300. While the photovoltaic integrated device 200 and the energy storage battery pack 300 are heating up, the photovoltaic integrated device 200 and the energy storage battery pack 300 are activated, and the photovoltaic power supply system 10 enters an operating state. During the heating process, if the real-time temperature is less than a first low-temperature threshold, the first temperature-controlled switch 410 closes, and the DC heater 420 continues to operate. When the real-time temperature is greater than or equal to the first low-temperature threshold, the first temperature-controlled switch 410 opens, and the DC heater 420 stops heating. During the cooling process, when the real-time temperature is greater than or equal to the second low-temperature threshold, the normally closed contact is disconnected and the DC heater 420 stops heating; when the real-time temperature is lower than the second low-temperature threshold, the first temperature control switch 410 is closed and the DC heater 420 starts heating.

[0067] In a specific embodiment of the present invention, Figure 1As shown, the high-temperature heat dissipation module 500 includes a second temperature control switch 510 and a heat dissipation fan 520; the second temperature control switch 510 is connected to the heat dissipation fan 220 and the off-grid interface of the photovoltaic integrated machine 200 respectively; the high temperature threshold includes a first high temperature threshold;

[0068] The second temperature control switch 510 is used to disconnect when the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the heating stage and the real-time temperature is less than the first high temperature threshold; and close when the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the heating stage and the real-time temperature is greater than or equal to the first high temperature threshold, so that the photovoltaic integrated machine 200 supplies AC power to the cooling fan 520.

[0069] Specifically, if Figure 1 As shown, the input end of the second temperature control switch 510 is connected to the off-grid interface of the photovoltaic integrated machine 200, and the second temperature control switch 510 includes two input interfaces, both of which are connected to the off-grid interface of the photovoltaic integrated machine 200, one of which is used to provide AC power to the cooling fan 520, and the other input interface is used to control the on and off of the second temperature control switch 510.

[0070] In some embodiments of the present invention, the high temperature threshold further includes a second high temperature threshold;

[0071] The second temperature control switch 310 is also used to close when the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the cooling stage and the real-time temperature is greater than or equal to the second high temperature threshold; and to disconnect when the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the cooling stage and the real-time temperature is less than the second high temperature threshold;

[0072] The second high temperature threshold is lower than the first high temperature threshold.

[0073] Similarly, the embodiment of the present invention is more targeted and reasonable by setting the first high temperature threshold and the second high temperature threshold to adapt to the photovoltaic integrated machine 200 and the energy storage battery group 300 in the heating stage and the cooling stage respectively, thereby improving the control precision and accuracy of the high temperature heat dissipation module 500.

[0074] In one specific embodiment, the second temperature control switch 510 is a normally-off switch. In a high-temperature environment, during the operating temperature rise process, if the real-time temperature is less than a first high-temperature threshold, the second temperature control switch 510 is disconnected, and the cooling fan 520 does not operate. When the real-time temperature is greater than or equal to the first high-temperature threshold, the second temperature control switch 510 is closed, and the cooling fan 520 operates. During the cooling process, if the real-time temperature is greater than or equal to a second high-temperature threshold, the second temperature control switch 510 is closed, and the cooling fan 520 operates. When the real-time temperature is less than the second high-temperature threshold, the second temperature control switch 510 is disconnected, and the cooling fan 520 stops operating.

[0075] The embodiment of the present invention ensures efficient and reliable operation of the photovoltaic power system 10 in a wide temperature range by providing the low-temperature heating module 400 and the high-temperature heat dissipation module 500 .

[0076] The embodiment of the present invention further provides a low temperature starting method for a photovoltaic power supply system, wherein the photovoltaic power supply system is the photovoltaic power supply system 10 in the above embodiment, such as Figure 2 As shown, the low-temperature startup method of the photovoltaic power system includes:

[0077] S201, determining whether the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery group 300 is less than a low temperature threshold;

[0078] S202: When the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 is lower than the low temperature threshold, the photovoltaic assembly 100 supplies DC power to the low-temperature heating module 400, so that the low-temperature heating module 400 provides heat for the photovoltaic integrated machine 200 and the energy storage battery pack 300.

[0079] Under the heat supply of the low-temperature heating module 400, the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 continues to rise. When the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 is greater than or equal to the low-temperature threshold, the photovoltaic assembly 100 does not supply power to the low-temperature heating module 400.

[0080] Specifically, the low-temperature heating module 400 includes a first temperature control switch 410 and a DC heater 420; then step S202 is specifically as follows:

[0081] When the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 is lower than the low temperature threshold, the first temperature control switch 410 is closed so that the photovoltaic assembly 100 supplies DC power to the DC heater 220; when the real-time temperature is greater than or equal to the low temperature threshold, the first temperature control switch 410 is disconnected.

[0082] Furthermore, the embodiment of the present invention takes into account that the photovoltaic power system 10 may be in a temperature rise or temperature fall stage, and accordingly, the low temperature threshold includes a first low temperature threshold and a second low temperature threshold, and the second low temperature threshold is smaller than the first low temperature threshold;

[0083] Then step S202 is specifically as follows:

[0084] When the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the heating stage and the real-time temperature is lower than the first low-temperature threshold, the first temperature control switch 410 is closed so that the photovoltaic assembly 100 supplies DC power to the DC heater 220; when the real-time temperature is higher than or equal to the first low-temperature threshold, the first temperature control switch 410 is disconnected.

[0085] When the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the cooling stage and the real-time temperature is greater than or equal to the second temperature threshold, the first temperature control switch 410 is disconnected; when the real-time temperature is less than the second temperature threshold, the first temperature control switch 410 is closed.

[0086] The embodiment of the present invention can realize the self-starting of the photovoltaic power supply system 10 in a low-temperature environment, thereby improving the operational reliability and power efficiency of the photovoltaic power supply system.

[0087] The embodiment of the present invention further provides a high temperature heat dissipation method for a photovoltaic power system, wherein the photovoltaic power system is the photovoltaic power system 10 in the above embodiment, such as Figure 3 As shown, the high-temperature heat dissipation methods of photovoltaic power systems include:

[0088] S301, determining whether the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 is greater than a high temperature threshold;

[0089] S302 . When the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 is greater than the high temperature threshold, the photovoltaic integrated machine 200 supplies AC power to the high-temperature heat dissipation module 500 so that the high-temperature heat dissipation module 500 dissipates heat for the photovoltaic integrated machine 200 and the energy storage battery pack 300 .

[0090] Under the heat dissipation of the high-temperature heat dissipation module 500, the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 continues to decrease. When the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 is less than or equal to the high-temperature threshold, the photovoltaic integrated machine 200 does not supply power to the high-temperature heat dissipation module 500.

[0091] Specifically, the high-temperature heat dissipation module 500 includes a second temperature control switch 510 and a heat dissipation fan 520; then step S302 is specifically as follows:

[0092] When the real-time temperature of the photovoltaic integrated machine 200 and the energy storage battery pack 300 is greater than the high temperature threshold, the second temperature control switch 510 is closed to enable the photovoltaic integrated machine 200 to supply AC power to the cooling fan 520; when the real-time temperature is less than or equal to the high temperature threshold, the second temperature control switch 510 is disconnected.

[0093] Furthermore, the embodiment of the present invention takes into account that the photovoltaic power system 10 may be in a temperature rise or temperature fall stage, and accordingly, the high temperature threshold includes a first high temperature threshold and a second high temperature threshold, and the second high temperature threshold is smaller than the first high temperature threshold;

[0094] Then step S302 is specifically as follows:

[0095] When the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the heating stage and the real-time temperature is less than the first high temperature threshold, the second temperature control switch 510 is disconnected; when the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the heating stage and the real-time temperature is greater than or equal to the first high temperature threshold, the second temperature control switch 510 is closed, so that the photovoltaic integrated machine 200 supplies AC power to the cooling fan 520.

[0096] When the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the cooling stage and the real-time temperature is greater than or equal to the second high temperature threshold, the second temperature control switch 510 is closed; when the photovoltaic integrated machine 200 and the energy storage battery pack 300 are in the cooling stage and the real-time temperature is less than the second high temperature threshold, the second temperature control switch 510 is disconnected.

[0097] The embodiment of the present invention can achieve high-temperature heat dissipation of the photovoltaic power system 10, avoid insecurity during high-temperature operation, and further improve the safety and power efficiency of the photovoltaic power system.

[0098] The present invention also provides a low temperature operation method for a photovoltaic power system, wherein the photovoltaic power system is the photovoltaic power system 10 in the above embodiment, such as Figure 4 As shown, the low temperature operation method of the photovoltaic power system includes:

[0099] S401, obtaining the first power P1 of the photovoltaic assembly 100, the heating power P2 of the energy storage battery group 300, the output power P3 of the energy storage battery group 300, the load power P4 and the battery group temperature of the energy storage battery group 3030;

[0100] S402: When the battery pack temperature is greater than or equal to zero degrees and less than or equal to a preset temperature, determine whether the load power P4 is zero and whether the first power P1 is less than or equal to the heating power P2;

[0101] S403: When the load power P4 is zero and the first power P1 is less than or equal to the heating power P2, the photovoltaic integrated machine 100 is controlled to charge the energy storage battery group 300 with the first power P1. The electric energy generated by the photovoltaic assembly 100 is only used to heat the energy storage battery group 300, and the energy storage battery group 300 is not charged.

[0102] S404: When the load power P4 is zero and the first power P1 is greater than the heating power P2, the photovoltaic integrated machine 100 is controlled to charge the energy storage battery group 300 with a power equal to the heating power P2. The electric energy generated by the photovoltaic assembly 100 is only used to heat the energy storage battery group 300, and the energy storage battery group 300 is not charged.

[0103] S405 , when the load power P4 is not zero, the load power is controlled to be the sum of the first power P1 and the output power P3 , and the photovoltaic assembly 100 and the energy storage battery group 300 jointly output electrical energy to meet the load power demand.

[0104] It should be noted that the preset temperature in step S402 is the second low temperature threshold.

[0105] Those skilled in the art will appreciate that all or part of the process steps of the above-described embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0106] The above is a detailed introduction to a photovoltaic power supply system and its low-temperature startup, high-temperature heat dissipation, and low-temperature operation method provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A photovoltaic power supply system, characterized in that: include: Photovoltaic modules, integrated photovoltaic machines, energy storage battery packs, low-temperature heating modules and high-temperature heat dissipation modules; The photovoltaic module is used to convert light energy into direct current; The photovoltaic integrated machine is used to adjust the parameters of the direct current to obtain alternating current; The energy storage battery pack is used to store the direct current; The photovoltaic assembly is further configured to supply direct current to the low-temperature heating module when the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is lower than a low-temperature threshold; The low-temperature heating module is used to provide heat for the photovoltaic integrated machine and the energy storage battery pack to start the photovoltaic integrated machine and the energy storage battery pack; The photovoltaic integrated machine is used to supply AC power to the high-temperature heat dissipation module when the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is greater than a high-temperature threshold; The high-temperature heat dissipation module is used to dissipate heat for the photovoltaic integrated machine and the energy storage battery pack; The low-temperature heating module includes a first temperature control switch and a DC heater; the first temperature control switch is respectively connected to the DC heater, the outlet of the photovoltaic module and the off-grid interface of the photovoltaic integrated machine; the low-temperature threshold includes a first low-temperature threshold; The first temperature-controlled switch is configured to close when the photovoltaic integrated machine and the energy storage battery pack are in a temperature-raising stage and the real-time temperature is less than a first low-temperature threshold, so that the photovoltaic assembly supplies direct current to the DC heater; and to open when the real-time temperature is greater than or equal to the first low-temperature threshold; The low temperature threshold also includes a second low temperature threshold; The first temperature control switch is further configured to disconnect when the photovoltaic integrated machine and the energy storage battery pack are in a cooling stage and the real-time temperature is greater than or equal to a second low-temperature threshold; and close when the real-time temperature is less than the second low-temperature threshold; wherein the second low temperature threshold is less than the first low temperature threshold; The high-temperature heat dissipation module further includes a second temperature control switch and a heat dissipation fan; the second temperature control switch is respectively connected to the heat dissipation fan and the off-grid interface of the photovoltaic integrated machine; the high temperature threshold includes a first high temperature threshold; The second temperature-controlled switch is configured to be disconnected when the photovoltaic integrated machine and the energy storage battery pack are in a temperature-raising stage and the real-time temperature is less than a first high-temperature threshold; and closed when the photovoltaic integrated machine and the energy storage battery pack are in a temperature-raising stage and the real-time temperature is greater than or equal to the first high-temperature threshold, so that the photovoltaic integrated machine supplies AC power to the cooling fan; The high temperature threshold also includes a second high temperature threshold; The second temperature-controlled switch is further configured to close when the photovoltaic integrated machine and the energy storage battery pack are in a cooling stage and the real-time temperature is greater than or equal to a second high temperature threshold; and to disconnect when the photovoltaic integrated machine and the energy storage battery pack are in a cooling stage and the real-time temperature is less than the second high temperature threshold; The second high temperature threshold is lower than the first high temperature threshold.

2. A low-temperature startup method for a photovoltaic power system, characterized in that: The photovoltaic power supply system is the photovoltaic power supply system according to claim 1, and the low-temperature starting method of the photovoltaic power supply system comprises: Determine whether the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is lower than the low temperature threshold; When the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is lower than the low temperature threshold, the photovoltaic assembly supplies direct current to the low-temperature heating module so that the low-temperature heating module provides heat to the photovoltaic integrated machine and the energy storage battery pack.

3. A high-temperature heat dissipation method for a photovoltaic power system, characterized in that: The photovoltaic power supply system is the photovoltaic power supply system according to claim 1, and the high-temperature heat dissipation method of the photovoltaic power supply system includes: Determine whether the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is greater than the high temperature threshold; When the real-time temperature of the photovoltaic integrated machine and the energy storage battery pack is greater than a high temperature threshold, the photovoltaic integrated machine supplies AC power to the high-temperature heat dissipation module so that the high-temperature heat dissipation module dissipates heat for the photovoltaic integrated machine and the energy storage battery pack.

4. A low-temperature operation method for a photovoltaic power system, characterized in that: The photovoltaic power supply system is the photovoltaic power supply system according to claim 1, and the low-temperature operation method of the photovoltaic power supply system includes: Obtaining a first power of the photovoltaic assembly, a heating power of the energy storage battery pack, an output power of the energy storage battery pack, a load power, and a battery pack temperature of the energy storage battery pack; When the battery pack temperature is greater than or equal to zero degrees and less than or equal to a preset temperature, determining whether the load power is zero and whether the first power is less than or equal to the heating power; When the load power is zero and the first power is less than or equal to the heating power, the photovoltaic integrated machine is controlled to charge the energy storage battery pack with the first power, and the electric energy generated by the photovoltaic assembly is only used to heat the energy storage battery pack, and the energy storage battery pack is not charged; When the load power is zero and the first power is greater than the heating power, the photovoltaic integrated machine is controlled to charge the energy storage battery pack with a power equal to the heating power, and the electric energy generated by the photovoltaic assembly is only used to heat the energy storage battery pack, and is not used to charge the energy storage battery pack; When the load power is not zero, the load power is controlled to be the sum of the first power and the output power, and the photovoltaic assembly and the energy storage battery group jointly output electrical energy.

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