Photovoltaic power supply system and method

Abstract

The invention discloses a photovoltaic power supply system and method. The system comprises a photovoltaic power generation system, a mains supply system, a UPS (Uninterrupted Power Supply) and a control module. The photovoltaic power generation system is connected with a first energy input end of the control module, the mains supply system is connected with the UPS, the UPS is connected with a second energy input end of the control module, and an output end of the control module is connected with a load end. The UPS is used for starting a power supply mode when it is determined that the mains supply system and / or the photovoltaic power generation system is insufficient in power supply. The photovoltaic power generation system is used for transmitting photovoltaic output electric quantity to a load end through the connected control module. The control module is used for determining the energy consumption power of the load end and adjusting the input energy of the first energy input end and the second energy input end according to the energy consumption power. According to the technical scheme, the maximum utilization of photovoltaic power generation is improved.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic power generation, and in particular to a photovoltaic power supply system and method. Background Art

[0002] Photovoltaic power generation is a technology that uses the photovoltaic effect of semiconductor interfaces to directly convert light energy into electrical energy.

[0003] At present, the photovoltaic power generation system adopts the mode of "photovoltaic power generation + mains + UPS" to supply power to the load. When the mains is working normally, the electricity generated by photovoltaic power is used first, and the mains is used as supplementary power for the load. When the mains is disconnected, the photovoltaic power will also stop working, and the UPS will provide power guarantee to the load equipment, resulting in a waste of photovoltaic power generation. Summary of the invention

[0004] The present invention provides a photovoltaic power supply system and method to maximize the utilization of photovoltaic power generation.

[0005] According to one aspect of the present invention, a photovoltaic power supply system is provided, the system comprising: a photovoltaic power generation system, a mains power system, a UPS power supply and a control module;

[0006] The photovoltaic power generation system is connected to the first energy input terminal of the control module, the mains power system is connected to the UPS power supply, the UPS power supply is connected to the second energy input terminal of the control module, and the output terminal of the control module is connected to the load terminal;

[0007] A UPS power supply, used to start a power supply mode when it is determined that the mains power system and / or the photovoltaic power generation system are insufficiently supplied;

[0008] The photovoltaic power generation system is used to transmit the photovoltaic output power to the load end through the connected control module;

[0009] The control module is used to determine the energy consumption power of the load end, and adjust the input energy of the first energy input end and the second energy input end according to the energy consumption power.

[0010] According to another aspect of the present invention, a photovoltaic power supply method is provided, which is applied to a photovoltaic power supply system, and the method comprises:

[0011] The control module of the photovoltaic power supply system determines the energy consumption of the load end, and adjusts the input energy of the first energy input end and the second energy input end according to the energy consumption;

[0012] The output end of the control module of the photovoltaic power supply system outputs the input energy to the load end;

[0013] Wherein, the UPS power supply of the photovoltaic power supply system starts the power supply mode when it is determined that the mains power system of the photovoltaic power supply system and / or the photovoltaic power generation system of the photovoltaic power supply system are insufficiently supplied;

[0014] The first energy input terminal and the second energy input terminal are configured on the control module, the photovoltaic power generation system is connected to the first energy input terminal of the control module, the UPS power supply is connected to the second energy input terminal of the control module, and the AC power system is connected to the UPS power supply.

[0015] The photovoltaic power supply system of the technical solution of the embodiment of the present invention includes: a photovoltaic power generation system, a mains power system, a UPS power supply and a control module. The photovoltaic power generation system is connected to the first energy input terminal of the control module, the mains power system is connected to the UPS power supply, the UPS power supply is connected to the second energy input terminal of the control module, and the output terminal of the control module is connected to the load terminal. The connection method of this system can effectively improve the maximum utilization of photovoltaic power generation. The UPS power supply is used to start the power supply mode when it is determined that the mains power system and / or the photovoltaic power generation system is insufficiently powered; the photovoltaic power generation system is used to transmit the photovoltaic output power to the load terminal through the connected control module; the control module is used to determine the energy consumption of the load terminal and adjust the input energy of the first energy input terminal and the second energy input terminal according to the energy consumption. The addition of the control module effectively distributes the energy output by the photovoltaic power generation system, the mains power system and the UPS power supply.

[0016] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a structural diagram of a photovoltaic power supply system provided according to an embodiment of the present invention.

[0019] Figure 2 It is a structural diagram of a control module in a photovoltaic power supply system provided according to an embodiment of the present invention.

[0020] Figure 3 The present invention provides a flow chart of a photovoltaic power supply method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0022] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] Embodiment 1

[0024] Figure 1 A structural diagram of a photovoltaic power supply system provided in an embodiment of the present invention. This embodiment is applicable to the situation where power can still be efficiently supplied to different loads when the city power is cut off.

[0025] like Figure 1 As shown, the photovoltaic power supply system includes: a photovoltaic power generation system 110 , a city power system 120 , a UPS power supply 130 and a control module 140 .

[0026] The photovoltaic power generation system 110 is connected to the first energy input terminal of the control module 140, the AC power system 120 is connected to the UPS power supply 130, the UPS power supply 130 is connected to the second energy input terminal of the control module 140, and the output terminal of the control module 140 is connected to the load terminal.

[0027] The UPS power supply is used to start the power supply mode when it is determined that the mains power system and / or the photovoltaic power generation system are insufficiently powered. The photovoltaic power generation system is used to transmit the photovoltaic output power to the load end through the connected control module. The control module is used to determine the energy consumption of the load end and adjust the input energy of the first energy input end and the second energy input end according to the energy consumption.

[0028] Among them, the photovoltaic power generation system is a system that uses the photovoltaic effect of the semiconductor interface to directly convert light energy into electrical energy. The photovoltaic power generation system is mainly composed of solar panels (modules). After the solar cells are connected in series and packaged for protection, they can form a large-area solar cell module, and then combined with power controllers and other components to form a photovoltaic power generation system. City electricity refers to the industrial frequency alternating current supplied by the national power grid. UPS power supply (Uninterruptible Power Supply) is an uninterruptible power supply with an energy storage device. UPS power supply is mainly used to provide uninterruptible power supply to some equipment that has high requirements for power supply stability.

[0029] The UPS power supply in the photovoltaic power supply system always remains in a waiting state. When it is determined that the mains power system and / or the photovoltaic power generation system are insufficiently supplied, the power supply mode is started to further supply power to the load.

[0030] Specifically, the control module determines the energy consumption of the load end, and adjusts the first input energy of the first energy input end and the second input energy of the second energy input end according to the energy consumption, and the sum of the first input energy and the second input energy is the energy consumption. The UPS power supply and the mains system serve as dual power supplies, and the second input energy is input into the control module from the second energy input end, and the photovoltaic power generation system inputs the first input energy from the first energy input end into the control module.

[0031] As an optional embodiment, the control module includes a control unit, and the control unit includes an energy acquisition unit, a first power distribution unit, and a second power distribution unit.

[0032] The energy acquisition unit is used to acquire the power generation of the photovoltaic power generation system, so that the control unit can adjust the input energy of the first energy input terminal and the second energy input terminal according to the acquired energy consumption power and power generation power of the load terminal, specifically including:

[0033] The first power distribution unit is used to determine that the input energy of the first energy input terminal is the power generation power and the input energy of the second energy input terminal is the first reference energy when it is determined that the power generation power is less than the energy consumption power. The reference energy is the difference between the energy consumption power and the power generation power.

[0034] The second power distribution unit is used to determine that the input energy of the first energy input terminal is the second reference energy and the input energy of the second energy input terminal is zero when the power generation power is greater than or equal to the energy consumption power; the second reference energy is the power generation power output by the photovoltaic power generation system with the same energy consumption power.

[0035] The technical solution of this embodiment adjusts the input energy of the first energy input terminal and the second energy input terminal according to the energy consumption power and power generation power obtained at the load terminal, which ensures that the electricity generated by photovoltaic power generation is used preferentially, greatly improves the utilization rate of photovoltaic power generation, and reduces energy costs. At the same time, it ensures that the energy input to the first energy input terminal by the photovoltaic power generation system is less than or equal to the energy consumption power, avoiding the reverse flow of energy from the load terminal to the UPS power supply, causing damage to the UPS power supply.

[0036] Furthermore, the first power distribution unit includes a power supply status determination subunit, a first power distribution subunit and a second power distribution subunit.

[0037] The power supply status determination subunit is used to determine the power supply status of the mains power system at the current moment when it is determined that the generated power is less than the consumed power. The power supply status includes the disconnected power supply status and the started power supply status. The disconnected power supply status is used to describe that the mains power system cannot supply power normally and is in a power-off state. The started power supply status is used to describe that the mains power system can supply power normally.

[0038] The first power source determination subunit is used to determine that if the power supply state of the mains system is disconnected, the input energy of the second energy input terminal is provided by the UPS power supply, and the input energy of the first energy input terminal is provided by the photovoltaic power generation system. That is, it is ensured that photovoltaic power generation can continue in the case of a power outage in the mains system, which can effectively improve the power supply guarantee capability after the power outage, extend the guarantee time, and help improve the reliability and stability of the power supply system.

[0039] The second power supply determination subunit is used for, if the power supply state of the mains system is the start-up power supply state, the input energy of the second energy input terminal is provided by the mains system and / or the UPS power supply. If the output energy of the mains system is greater than or equal to the first reference energy, the input energy of the second energy input terminal is provided by the mains system. If the output energy of the mains system is less than the first reference energy, the UPS power supply is started, the UPS power supply provides the reference output energy, the sum of the output energy of the mains system and the reference output energy is the first reference energy, and the output energy of the mains system and the reference output energy are combined and input to the second energy input terminal.

[0040] In this embodiment, Figure 2 1 is a structural diagram of a control module in a photovoltaic power supply system according to an embodiment of the present invention. The control module includes a control unit 1401 , a rectifier unit 1402 , a converging unit 1403 , an inverter unit 1404 and a DC control unit 1405 .

[0041] The current received by the second energy input terminal is alternating current. The current received by the first energy input terminal is direct current. The rectifier unit is used to convert alternating current into direct current, and the inverter power supply is used to convert direct current into alternating current.

[0042] Furthermore, the rectifier unit is used to convert the input energy of the second energy input terminal into direct current. The confluence unit is used to converge the energy output from the rectifier unit and the input energy of the second energy input terminal, and output the converged energy. The inverter unit is used to convert the converged energy into alternating current and provide energy to the load terminal through the output terminal of the control module. The DC control unit is used to stabilize the photovoltaic output power.

[0043] Furthermore, the rectifier unit can be a rectifier (AC / DC). The inverter unit can be an inverter (DC / AC). The UPS power supply and the mains system serve as dual power supplies to input the second input energy into the control module through the second energy input terminal, the photovoltaic power generation system inputs the first input energy into the control module through the first energy input terminal, the second input energy is converted into the first DC energy through the rectifier, the second input energy is converted into the second DC energy through the DC control unit (DC control), the first DC energy and the second DC energy are merged and output as the third DC energy through the confluence unit, and the third DC energy is converted into AC power through the inverter and then input to the load terminal through the output terminal of the control module. Among them, the control unit detects the energy consumption of the load terminal in real time, and synchronously adjusts the voltage and power of the photovoltaic power generation system through the adaptive algorithm control, so as to realize the photovoltaic power supply priority and ensure that the reverse current impact on the UPS system is not caused on the basis of matching the load demand.

[0044] The adaptive control algorithm can be used to coordinately control the output of the photovoltaic power generation system and the UPS power supply. The adaptive control algorithm can predict the output change trend of the photovoltaic power generation system based on real-time monitoring of load energy consumption data, and timely adjust the photovoltaic power generation output power and match the output power of the UPS power supply and / or the mains system to ensure smooth transition and precise coordinated power supply.

[0045] The technical solution of this embodiment directly monitors the real-time power at the load end and controls the output of the photovoltaic power generation system according to the power matching solution, thereby solving the problem of short-term reverse current caused by first detecting whether reverse current occurs and then adjusting the energy consumption, so as to avoid insufficient or excessive energy supply.

[0046] The photovoltaic power supply system of the technical solution of the embodiment of the present invention includes: a photovoltaic power generation system, a mains power system, a UPS power supply and a control module. The photovoltaic power generation system is connected to the first energy input terminal of the control module, the mains power system is connected to the UPS power supply, the UPS power supply is connected to the second energy input terminal of the control module, and the output terminal of the control module is connected to the load terminal. The connection method of this system can effectively improve the maximum utilization of photovoltaic power generation. The UPS power supply is used to start the power supply mode when it is determined that the mains power system and / or the photovoltaic power generation system is insufficiently powered; the photovoltaic power generation system is used to transmit the photovoltaic output power to the load terminal through the connected control module; the control module is used to determine the energy consumption of the load terminal and adjust the input energy of the first energy input terminal and the second energy input terminal according to the energy consumption. The addition of the control module effectively distributes the energy output by the photovoltaic power generation system, the mains power system and the UPS power supply.

[0047] Embodiment 2

[0048] Figure 3 This is a flow chart of a photovoltaic power supply method provided by an embodiment of the present invention. This embodiment is applicable to the situation where different loads can still be efficiently powered when the city power is off. This method can be executed by a photovoltaic power supply system. Figure 3 As shown, the photovoltaic power supply method may include:

[0049] S210, the control module of the photovoltaic power supply system determines the energy consumption of the load end, and adjusts the input energy of the first energy input end and the second energy input end according to the energy consumption.

[0050] S220 , the output end of the control module of the photovoltaic power supply system outputs the input energy to the load end.

[0051] The UPS power supply of the photovoltaic power supply system starts the power supply mode when it is determined that the mains power system of the photovoltaic power supply system and / or the photovoltaic power generation system of the photovoltaic power supply system are insufficiently supplied.

[0052] The first energy input terminal and the second energy input terminal are configured on the control module, the photovoltaic power generation system is connected to the first energy input terminal of the control module, the UPS power supply is connected to the second energy input terminal of the control module, and the AC power system is connected to the UPS power supply.

[0053] On the basis of the above embodiment, optionally, the control module includes a control unit, and the control unit includes an energy acquisition unit, a first power distribution unit and a second power distribution unit.

[0054] The control module of the photovoltaic power supply system determines the energy consumption of the load end and adjusts the input energy of the first energy input end and the second energy input end according to the energy consumption, including:

[0055] The energy acquisition unit acquires the power generated by the photovoltaic power generation system.

[0056] The first power distribution unit determines that when the generated power is less than the consumed power, the input energy of the first energy input terminal is determined to be the generated power, the input energy of the second energy input terminal is determined to be the first reference energy, and the reference energy is the difference between the consumed power and the generated power.

[0057] The second power distribution unit determines that when the generated power is greater than or equal to the energy consumption power, the input energy of the first energy input terminal is determined to be the second reference energy, and the input energy of the second energy input terminal is zero; the second reference energy is the generated power output by the photovoltaic power generation system which is the same as the energy consumption power.

[0058] On the basis of the above embodiment, optionally, the first power distribution unit includes a power supply state determination subunit, a first power distribution subunit and a second power distribution subunit.

[0059] The first power distribution unit determines that when the power generation power is less than the energy consumption power, the input energy of the first energy input end is determined to be the power generation power, including:

[0060] The power supply status determination subunit determines the power supply status of the mains power system at the current moment when it is determined that the generated power is less than the consumed power;

[0061] The first power source determination subunit determines that if the power supply state of the mains power system is a power supply disconnection state, the input energy of the second energy input end is provided by the UPS power source.

[0062] The second power supply determination subunit is used to determine that if the power supply state of the mains power system is the start-up power supply state, the input energy of the second energy input end is provided by the mains power system and / or the UPS power supply.

[0063] On the basis of the above embodiment, optionally, the control module includes a rectifier unit, and the rectifier unit is used to convert the input energy of the second energy input terminal into direct current.

[0064] On the basis of the above embodiment, optionally, the control module includes a confluence unit, and the confluence unit is used to converge the energy output from the rectifier unit and the input energy of the second energy input end, and output the converged energy.

[0065] On the basis of the above embodiment, optionally, the control module includes an inverter unit, and the inverter unit is used to convert the converged energy into alternating current and provide energy to the load end through the output end of the control module.

[0066] Based on the above embodiment, optionally, the rectifying unit is a rectifier.

[0067] Based on the above embodiment, optionally, the inverter unit is an inverter.

[0068] Based on the above embodiment, optionally, the control module includes a DC control unit, and the DC control unit is used to stabilize the photovoltaic output power.

[0069] The photovoltaic power supply method provided in the embodiment of the present invention can be applied to the photovoltaic power supply system provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0070] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0071] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A photovoltaic power supply system, characterized in that: The system includes: a photovoltaic power generation system, a mains power system, a UPS power supply and a control module; The photovoltaic power generation system is connected to the first energy input terminal of the control module, the mains power system is connected to the UPS power supply, the UPS power supply is connected to the second energy input terminal of the control module, and the output terminal of the control module is connected to the load terminal; The UPS power supply is used to start the power supply mode when it is determined that the mains power system and / or the photovoltaic power generation system are insufficiently supplied; The photovoltaic power generation system is used to transmit the photovoltaic output power to the load end through the connected control module; The control module is used to determine the energy consumption power of the load end, and adjust the input energy of the first energy input end and the second energy input end according to the energy consumption power.

2. The system according to claim 1, characterized in that The control module includes a control unit, and the control unit includes an energy acquisition unit, a first power distribution unit and a second power distribution unit; An energy acquisition unit, used to acquire the power generated by the photovoltaic power generation system; a first power distribution unit, configured to determine, when the generated power is less than the consumed power, that the input energy of the first energy input terminal is the generated power, and the input energy of the second energy input terminal is a first reference energy, wherein the reference energy is a difference between the consumed power and the generated power; The second power distribution unit is used to determine that the input energy of the first energy input terminal is the second reference energy and the input energy of the second energy input terminal is zero when the generated power is greater than or equal to the consumed power; the second reference energy is the generated power output by the photovoltaic power generation system which is the same as the consumed power.

3. The system according to claim 2, characterized in that The first power distribution unit includes a power supply state determination subunit, a first power distribution subunit and a second power distribution subunit; A power supply status determination subunit, used to determine the power supply status of the mains power system at the current moment when the generated power is less than the consumed power; a first power source determination subunit, configured to, if the power supply state of the mains power system is a power-off state, input energy of the second energy input end is provided by the UPS power source; The second power supply determination subunit is used to determine that if the power supply state of the mains power system is the start-up power supply state, the input energy of the second energy input end is provided by the mains power system and / or the UPS power supply.

4. The system according to claim 1, characterized in that The control module includes a rectifier unit, which is used to convert input energy from the second energy input terminal into direct current.

5. The system according to claim 4, characterized in that The control module includes a confluence unit, which is used to converge the energy output from the rectifying unit and the input energy of the second energy input end, and output the converged energy.

6. The system according to claim 5, characterized in that The control module includes an inverter unit, which is used to convert the converged energy into alternating current and provide energy to the load end through the output end of the control module.

7. The system according to claim 4, characterized in that The rectifying unit is a rectifier.

8. The system according to claim 6, characterized in that The inverter unit is an inverter.

9. The system according to claim 1, characterized in that The control module includes a DC control unit, and the DC control unit is used to stabilize the photovoltaic output power.

10. A photovoltaic power supply method, characterized in that: Applied to any one of claims 1 to 9 of the photovoltaic power supply system, the method comprising: The control module of the photovoltaic power supply system determines the energy consumption of the load end, and adjusts the input energy of the first energy input end and the second energy input end according to the energy consumption; The output end of the control module of the photovoltaic power supply system outputs the input energy to the load end; Wherein, the UPS power supply of the photovoltaic power supply system starts the power supply mode when it is determined that the mains power system of the photovoltaic power supply system and / or the photovoltaic power generation system of the photovoltaic power supply system are insufficiently supplied; The first energy input terminal and the second energy input terminal are configured on the control module, the photovoltaic power generation system is connected to the first energy input terminal of the control module, the UPS power supply is connected to the second energy input terminal of the control module, and the AC power system is connected to the UPS power supply.

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