Power distribution system for offshore off-grid photovoltaic power generation

Abstract

The invention provides a power distribution system for offshore off-grid photovoltaic power generation. The power distribution system comprises a photovoltaic power generation assembly, an energy storage assembly, an energy storage converter, an inverter, a power adjustable absorption box and a power distribution box. Wherein the photovoltaic power generation assembly is connected with the power distribution box through the inverter, so that electric energy converted from solar energy can be transmitted to the power distribution box and is distributed by the power distribution box. The distribution box is connected with the energy storage assembly through the energy storage converter, so that the distribution box can obtain the energy storage capacity condition of the energy storage assembly. The power distribution box is connected with the energy storage converter and the power adjustable consumption box, and can adjust and control the power of the energy storage converter and / or the power adjustable consumption box according to the output power of the inverter, the energy storage capacity of the energy storage assembly and the power consumption power of the power utilization load. Therefore, the generating capacity of the photovoltaic power generation assembly can be ensured to stably supply power to an electricity load in the offshore off-grid power system. The power generation amount of the photovoltaic power generation assembly is reasonably distributed through the distribution box, and the stability of offshore off-grid power supply can be improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic power generation technology, and in particular to a distribution system for offshore off-grid photovoltaic power generation. 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. It is mainly composed of three parts: solar panels (modules), controllers and inverters, and the main parts are composed of electronic components.

[0003] Photovoltaic power generation is easily affected by external environmental factors, such as light intensity, wind speed, and humidity. The electric energy output by photovoltaic power generation will also fluctuate greatly, and the amplitude of the electric energy output by photovoltaic power generation will also jump to a large extent, thus affecting the power supply stability of the off-grid photovoltaic system. Summary of the invention

[0004] The main purpose of the embodiments of the present application is to propose a distribution system for offshore off-grid photovoltaic power generation, which aims to reasonably distribute the power generated by photovoltaic power generation components through distribution boxes, thereby improving the stability of offshore off-grid power supply.

[0005] To achieve the above-mentioned purpose, the first aspect of the embodiment of the present application proposes a distribution system for offshore off-grid photovoltaic power generation, including a photovoltaic power generation component, an energy storage component, an energy storage converter, an inverter, a power adjustable consumption box and a distribution box, wherein the photovoltaic power generation component is connected to the first end of the inverter, the second end of the inverter is connected to the first end of the distribution box, the second end of the distribution box is connected to the first end of the energy storage converter, the second end of the energy storage converter is connected to the energy storage component, the third end of the distribution box is connected to the power adjustable consumption box, and the fourth end of the distribution box is used to connect the power load; wherein the distribution box is configured as follows:

[0006] The power of the energy storage converter and / or the power adjustable consumption box is adjusted and controlled according to the output power of the inverter, the energy storage capacity of the energy storage component and the power consumption of the electrical load to provide stable power supply to the electrical load.

[0007] In one embodiment of the present application, the power of the energy storage converter and / or the power adjustable consumption box is adjusted according to the output power of the inverter, the energy storage capacity of the energy storage component and the power consumption of the power load to provide stable power supply to the power load, including:

[0008] When the output power of the inverter is greater than the power consumption of the power load, and the energy storage capacity of the energy storage component meets the charging condition, it is determined whether a first difference between the output power and the power consumption is greater than a maximum charging power;

[0009] If the first difference is greater than the maximum charging power, the energy storage converter is adjusted to charge the energy storage component with the maximum charging power, and the power-adjustable consumption box is adjusted to operate with the first consumption power, so as to control the power generation of the photovoltaic power generation component to be distributed to supply power to the power load, charge the energy storage component, and be consumed by the power-adjustable consumption box, and the first consumption power is equal to the first difference minus the maximum charging power;

[0010] If the first difference is less than or equal to the maximum charging power, the energy storage converter is adjusted to charge the energy storage component with the first charging power, and the power adjustable consumption box is adjusted not to work, so as to control the power generation of the photovoltaic power generation component to be distributed to supply power to the power load and charge the energy storage component, and the first charging power is equal to the output power minus the power consumption power;

[0011] When the output power of the inverter is greater than the power consumption of the electrical load, but the energy storage capacity of the energy storage component does not meet the charging conditions, the power of the energy storage inverter is adjusted to 0, and the power-adjustable consumption box is adjusted to operate at a second consumption power to control the power generation of the photovoltaic power generation component to be distributed to supply power to the electrical load and to be consumed by the power-adjustable consumption box, and the second consumption power is equal to the first difference.

[0012] In one embodiment of the present application, the power of the energy storage converter and / or the power adjustable consumption box is adjusted according to the output power of the inverter, the energy storage capacity of the energy storage component and the power consumption of the power load to provide stable power supply to the power load, including:

[0013] When the output power of the inverter is less than the power consumption of the power load, and the energy storage capacity of the energy storage component meets the discharge condition, the energy storage converter is adjusted to discharge the energy storage component at a first discharge power, and the power adjustable consumption box is adjusted not to work, so as to control the photovoltaic power generation component and the energy storage component to jointly supply power to the power load, and the first discharge power is equal to the power consumption minus the output power;

[0014] When the output power of the inverter is equal to the power consumption of the power load, the power of the energy storage converter is adjusted to 0, and the power adjustable consumption box is adjusted to not work, so as to control the photovoltaic power generation group to supply power to the power load.

[0015] In one embodiment of the present application, when the power generation of the photovoltaic power generation assembly is controlled to be distributed to supply power to the power load and to be consumed by the power adjustable consumption box, the distribution box is further configured as follows:

[0016] When the output power of the inverter increases suddenly, and the energy storage capacity of the energy storage component meets the charging condition, the energy storage converter is controlled to charge the energy storage component with a second charging power, and the power adjustable consumption box is controlled to start power loading, and the second charging power is equal to the sudden increase of the output power;

[0017] When the power of the power-adjustable consumption box is loaded to the third consumption power, the power of the energy storage converter is controlled to be adjusted to 0, and the third consumption power is equal to the output power after the sudden increase minus the power consumption.

[0018] In one embodiment of the present application, when the power generation of the photovoltaic power generation assembly is controlled to be distributed to supply power to the power load and to be consumed by the power adjustable consumption box, the distribution box is further configured as follows:

[0019] When the output power of the inverter increases slowly, the power of the power-adjustable consumption box is controlled to increase slowly following the change of the output power of the inverter, so as to keep the output power of the inverter always equal to the working power of the power-adjustable consumption box plus the power consumption of the electrical load.

[0020] In one embodiment of the present application, when the power generation of the photovoltaic power generation assembly is controlled to be distributed to supply power to the power load and to be consumed by the power adjustable consumption box, the distribution box is further configured as follows:

[0021] When the output power of the inverter suddenly decreases, and the energy storage capacity of the energy storage component meets the discharge condition, the energy storage converter is controlled to discharge the energy storage component at a second discharge power, and the power adjustable consumption box is controlled to start power load reduction, and the second discharge power is equal to the sudden decrease in the output power;

[0022] When the power of the power-adjustable consumption box is reduced to a fourth consumption power, the power of the energy storage converter is controlled to be adjusted to 0, and the fourth consumption power is equal to the output power after the sudden reduction minus the power consumption.

[0023] In one embodiment of the present application, when the power generation of the photovoltaic power generation assembly is controlled to be distributed to supply power to the power load and to be consumed by the power adjustable consumption box, the distribution box is further configured as follows:

[0024] When the output power of the inverter decreases, the power of the power-adjustable consumption box is controlled to decrease slowly following the change of the output power of the inverter, so as to keep the output power of the inverter always equal to the working power of the power-adjustable consumption box plus the power consumption of the electrical load.

[0025] In one embodiment of the present application, the distribution box is further configured as:

[0026] According to the power consumption of the electrical load, the working power of the power adjustable consumption box and / or the power of the energy storage converter is adjusted to determine the output power of the inverter.

[0027] In one embodiment of the present application, adjusting the working power of the power adjustable consumption box and / or the power of the energy storage converter according to the power consumption of the power load to determine the output power of the inverter includes:

[0028] When the power generation of the photovoltaic power generation assembly can meet the normal operation of the power load, obtaining the power consumption of the power load;

[0029] When the power load is operating normally, controlling the energy storage converter to charge the energy storage component with a set charging power;

[0030] The power of the power-adjustable consumption box is adjusted until it is detected that the power load changes from normal operation to abnormality, and the consumption power of the power-adjustable consumption box in the current state is obtained;

[0031] The set charging power, the power consumption and the absorption power are added together to obtain the output power of the inverter.

[0032] In one embodiment of the present application, adjusting the working power of the power adjustable consumption box and / or the power of the energy storage converter according to the power consumption of the power load to determine the output power of the inverter includes:

[0033] When the power generation of the photovoltaic power generation component cannot meet the power consumption of the power load, control and adjust the discharge power of the energy storage converter to discharge the energy storage component until the power load is detected to be operating normally, and obtain the discharge power of the energy storage converter in the current state;

[0034] Obtaining the power consumption of the power load under normal operation;

[0035] The output power of the inverter is obtained by subtracting the discharge power from the power consumption.

[0036] In the technical solution provided in the embodiment of the present application, a distribution system for offshore off-grid photovoltaic power generation is proposed, including a photovoltaic power generation component, an energy storage component, an energy storage converter, an inverter, a power-adjustable consumption box and a distribution box. Among them, the photovoltaic power generation component is connected to the distribution box through an inverter, so that the electric energy converted from solar energy can be transmitted to the distribution box, which is distributed by the distribution box. The distribution box is connected to the energy storage component through the energy storage converter, so that the distribution box can obtain the energy storage capacity of the energy storage component. The distribution box is connected to the energy storage converter and the power-adjustable consumption box, and the power of the energy storage converter and / or the power-adjustable consumption box can be adjusted and controlled according to the output power of the inverter, the energy storage capacity of the energy storage component and the power consumption of the power load, so as to ensure that the power generation of the photovoltaic power generation component can provide stable power supply to the power load in the offshore off-grid power system. That is, the power generation of the photovoltaic power generation component is reasonably distributed through the distribution box, which can improve the stability of offshore off-grid power supply.

[0037] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a distribution system for offshore off-grid photovoltaic power generation provided in one embodiment of the present application.

[0039] Figure 2 This is a first flow chart of a power distribution method provided in one embodiment of the present application.

[0040] Figure 3 This is a second flow chart of the power distribution method provided in one embodiment of the present application.

[0041] Figure 4 This is the third flow chart of the power distribution method provided in one embodiment of the present application.

[0042] Figure 5 This is the fourth flow chart of the power distribution method provided in one embodiment of the present application.

[0043] Figure 6 This is the fifth flow chart of the power distribution method provided in one embodiment of the present application.

[0044] Figure 7 This is a flowchart of the first step of determining the output power of the inverter provided by an embodiment of the present application.

[0045] Figure 8 This is a flowchart of the second step of determining the output power of the inverter provided in an embodiment of the present application.

[0046] Reference numerals:

[0047] Photovoltaic power generation component 11, energy storage component 12, energy storage converter 13, inverter 14, power adjustable consumption box 15, distribution box 16, power load 20. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0051] Photovoltaic power generation is easily affected by external environmental factors, such as light intensity, wind speed, and humidity. The electric energy output by photovoltaic power generation will also fluctuate greatly, and the amplitude of the electric energy output by photovoltaic power generation will also jump to a large extent, thus affecting the power supply stability of the off-grid photovoltaic system.

[0052] Based on this, an embodiment of the present application provides a distribution system for offshore off-grid photovoltaic power generation, which aims to reasonably distribute the power generated by photovoltaic power generation components through distribution boxes, thereby improving the stability of offshore off-grid power supply.

[0053] Reference Figure 1 , Figure 1 It is a structural schematic diagram of an offshore off-grid photovoltaic power generation distribution system provided in one embodiment of the present application, which is used to provide power to the power loads in the offshore off-grid power system to meet the power demand of the power loads in the offshore off-grid power system.

[0054] Reference Figure 1The distribution system of offshore off-grid photovoltaic power generation includes a photovoltaic power generation component 11, an energy storage component 12, an energy storage converter 13, an inverter 14, a power adjustable consumption box 15 and a distribution box 16. The photovoltaic power generation component 11 is connected to a first end of the inverter 14, a second end of the inverter 14 is connected to a first end of the distribution box 16, a second end of the distribution box 16 is connected to a first end of the energy storage converter 13, a second end of the energy storage converter 13 is connected to the energy storage component 12, a third end of the distribution box 16 is connected to the power adjustable consumption box 15, and a fourth end of the distribution box 16 is used to connect an electrical load 20.

[0055] The photovoltaic power generation assembly 11 is used for photovoltaic power generation. The photovoltaic power generation assembly 11 is not connected to the power grid to form an offshore off-grid photovoltaic power generation system. The photovoltaic power generation assembly 11 is connected to the inverter 14, so that the inverter 14 can convert the electric energy generated by the photovoltaic power generation assembly 11 into alternating current and then supply power to the distribution box 16.

[0056] The distribution box 16 is connected to the energy storage component 12 through the energy storage inverter 13. The energy storage inverter 13 can control the charging and discharging process of the energy storage component 12 and perform AC-DC conversion. The energy storage inverter 13 can directly supply power to the AC load without a power grid. The energy storage inverter 13 is composed of a DC / AC bidirectional inverter, a control unit, etc. The control unit in the energy storage inverter 13 can receive the power control instructions generated by the distribution box 16, and control the DC / AC bidirectional inverter to charge or discharge the energy storage component 12 according to the power control instructions, so as to adjust the charging power or discharging power of the energy storage component 12. The control unit in the energy storage inverter 13 can also obtain the energy storage capacity information of the energy storage component 12, and can realize the protective charging and discharging of the energy storage component 12 to ensure the safe operation of the energy storage component 12. Among them, the energy storage component 12 may include batteries, supercapacitors, compressed air energy storage, etc.

[0057] The distribution box 16 is also connected to the power adjustable consumption box 15 , so that the distribution box 16 can send a power adjustment instruction to the power adjustable consumption box 15 , so that the power adjustable consumption box 15 adjusts the consumption power according to the power adjustment instruction sent by the distribution box 16 .

[0058] The distribution box 16 is also connected to the power load 20 in the offshore off-grid power system, so that the power load 20 can be powered by the electric energy generated by the photovoltaic power generation assembly.

[0059] In the embodiment of the present application, considering the instability of photovoltaic power generation, in order to ensure stable power supply to the power load 20, the distribution box 16 is configured to adjust and control the power of the energy storage converter 13 and / or the power adjustable consumption box 15 according to the output power of the inverter 14, the energy storage capacity of the energy storage component 12 and the power consumption of the power load 20, so as to provide stable power supply to the power load 20. Specifically, if it is detected that the power generation of the photovoltaic power generation component 11 is greater than the power consumption of the power load 20, the power of the energy storage converter 13 can be adjusted so that the power remaining after the power generation of the photovoltaic power generation component 11 is used to power the power load 20 can be used to charge the energy storage component 12. If there is still power remaining after charging, in order to balance the supply and demand relationship of power grid power consumption, the power of the power adjustable consumption box 15 can be adjusted to control the remaining power consumed by the power adjustable consumption box 15, thereby ensuring stable power supply to the power load 20. When it is detected that the power generation of the photovoltaic power generation component 11 is less than the power consumption of the power load 20, the power of the energy storage inverter 13 can be adjusted to control the energy storage component 12 to discharge according to a certain discharge power, that is, the photovoltaic power generation component 11 and the energy storage component 12 are controlled to jointly supply power to the power load 20 to meet the power supply demand of the power load 20.

[0060] In the embodiment of the present application, the distribution box 16 can adjust and control the power of the energy storage inverter 13 and / or the power adjustable consumption box 15 according to the output power of the inverter 14, the energy storage capacity of the energy storage component 12 and the power consumption of the power load 20, so as to reasonably distribute the power generation of the photovoltaic power generation component 11 and improve the stability of offshore off-grid power supply.

[0061] Reference Figure 2 , Figure 2 It is a first flow chart of a power distribution method provided in an embodiment of the present application, which is executed by the distribution box 16, including but not limited to steps S210 to S260.

[0062] Step S210, determining that the output power of the inverter is greater than the power consumption of the power load;

[0063] Step S220, detecting whether the energy storage capacity of the energy storage component meets the charging conditions;

[0064] Step S230, if the energy storage capacity of the energy storage component meets the charging condition, determine whether a first difference between the output power of the inverter and the power consumption of the power load is greater than the maximum charging power;

[0065] Step S240: If the first difference between the output power of the inverter and the power consumption of the power load is greater than the maximum charging power, the energy storage converter is controlled to charge the energy storage component at the maximum charging power, and the power adjustable consumption box is controlled to operate at the first consumption power, wherein the first consumption power is equal to the first difference minus the maximum charging power;

[0066] Step S250: If the first difference between the output power of the inverter and the power consumption of the power load is less than or equal to the maximum charging power, the energy storage converter is controlled to charge the energy storage component with the first charging power, and the power adjustable consumption box is controlled not to work;

[0067] Step S260: If the energy storage capacity of the energy storage component does not meet the charging condition, the energy storage converter is controlled not to work, and the power adjustable consumption box is controlled to work at a second consumption power, wherein the second consumption power is equal to the first difference.

[0068] In the embodiment of the present application, when the power generation of the photovoltaic power generation component 11 is greater than the power consumption of the power load 20, that is, when the output power of the inverter 14 is greater than the power consumption of the power load 20, it is necessary to further detect whether the energy storage capacity of the energy storage component 12 meets the charging condition. If the energy storage capacity of the energy storage component 12 is less than 90%, it can be determined that the energy storage capacity of the energy storage component 12 meets the charging condition, and if the energy storage capacity of the energy storage component 12 is greater than or equal to 90%, it is considered that the energy storage capacity of the energy storage component 12 does not meet the charging condition. When the energy storage capacity of the energy storage component 12 meets the charging conditions, it is further detected whether the first difference between the output power of the inverter 14 and the power consumption of the electrical load 20 is greater than the maximum charging power. If the first difference between the output power of the inverter 14 and the power consumption of the electrical load 20 is greater than the maximum charging power, the energy storage inverter 13 is controlled to charge the energy storage component 12 with the maximum charging power, and the power adjustable consumption box 15 is controlled to operate with the first consumption power, wherein the first consumption power is equal to the first difference minus the maximum charging power. That is, when the power generation of the photovoltaic power generation component 11 is greater than the power consumption of the power load 20, and there is still power left after the power generation of the photovoltaic power generation component 11 is used to power the power load 20 and to charge the energy storage component 12, the power generation of the photovoltaic power generation component 11 can be controlled to be allocated to power the power load 20 and charge the energy storage component 12 and to be consumed by the power adjustable consumption box 15, so that the power generation of the photovoltaic power generation component 11 can be fully utilized and absorbed, and the supply and demand relationship of electricity consumption in the offshore off-grid power system can be balanced, so as to stably supply power to the power load 20 of the offshore off-grid power system. If the first difference between the output power of the inverter 14 and the power consumption of the power load 20 is not greater than the maximum charging power, the energy storage converter 13 is controlled to charge the energy storage component 12 with the first charging power, and the power adjustable consumption box 15 is controlled not to work. That is, if the first difference between the output power of the inverter 14 and the power consumption of the power load 20 is not greater than the maximum charging power, it means that the power remaining after the power generation of the photovoltaic power generation component 11 is used to power the power load 20 can be used to charge the energy storage component 12, that is, it is stored by the energy storage component 12. At this time, there is no need for the power adjustable consumption box 15 to consume the excess power, that is, the power adjustable consumption box 15 is controlled not to work. That is, when the power generation of the photovoltaic power generation component 11 is greater than the power consumption of the power load 20, and the power generation of the photovoltaic power generation component 11 is only enough to power the power load 20 and charge the energy storage component 12, the power generation of the photovoltaic power generation component 11 is controlled to be allocated to power the power load 20 and charge the energy storage component 12, so that the power generation of the photovoltaic power generation component 11 can be fully utilized and absorbed, and the supply and demand relationship of electricity consumption in the offshore off-grid power system can be balanced, so that the power load 20 of the offshore off-grid power system can be stably supplied with electricity.When the power generation of the photovoltaic power generation component 11 is greater than the power consumption of the power load 20, if the energy storage capacity of the energy storage component 12 does not meet the charging conditions, at this time, the remaining power after the power generation of the photovoltaic power generation component 11 is used to power the power load 20 cannot be stored by the energy storage component 12. Therefore, it is necessary to control the power adjustable consumption box 15 to consume the remaining power, that is, it is necessary to control the energy storage inverter 13 not to work (that is, adjust the power of the energy storage inverter 13 to 0), and control the power adjustable consumption box 15 to work at the second consumption power, wherein the second consumption power is equal to the first difference. That is, when the power generation of the photovoltaic power generation component 11 is greater than the power consumption of the power load 20, and the energy storage capacity of the energy storage component 12 does not meet the charging conditions, the power generation of the photovoltaic power generation component 11 is controlled to be distributed to supply power to the power load 20 and to be absorbed by the power adjustable consumption box 15, so that the power generation of the photovoltaic power generation component 11 can be fully utilized and absorbed, and the supply and demand relationship of electricity consumption in the offshore off-grid power system can be balanced, thereby providing stable power supply to the power load 20 of the offshore off-grid power system.

[0069] Reference Figure 3 , Figure 3 It is a second flow chart of the power distribution method provided in an embodiment of the present application, which is executed by the distribution box 16, including but not limited to steps S310 to S340.

[0070] Step S310, determining that the output power of the inverter is less than the power consumption of the power load;

[0071] Step S320, detecting whether the energy storage capacity of the energy storage component meets the discharge condition;

[0072] Step S330: If the energy storage capacity of the energy storage component meets the discharge condition, the energy storage converter is controlled to discharge the energy storage component at a first discharge power, and the power adjustable consumption box is controlled not to work;

[0073] Step S340: If the energy storage capacity of the energy storage component does not meet the discharge condition, the power consumption of the electrical load is controlled to be reduced until the power consumption of the electrical load is equal to the output power of the inverter.

[0074] In the embodiment of the present application, when the power generation of the photovoltaic power generation component 11 is less than the power consumption of the power load 20, that is, when the output power of the inverter 14 is less than the power consumption of the power load 20, at this time, it is necessary to further detect whether the energy storage capacity of the energy storage component 12 meets the discharge condition. If the energy storage capacity of the energy storage component 12 is greater than or equal to 60%, it can be determined that the energy storage capacity of the energy storage component 12 meets the discharge condition, and if the energy storage capacity of the energy storage component 12 is less than 60%, it is considered that the energy storage capacity of the energy storage component 12 does not meet the discharge condition. When the energy storage capacity of the energy storage component 12 meets the discharge condition, the energy storage converter 13 can be controlled to discharge the energy storage component 12 at the first discharge power, and the power adjustable consumption box 15 can be controlled not to work, so that the photovoltaic power generation component 11 and the energy storage component 12 can be controlled to jointly supply power to the power load 20. That is, when the power generation of the photovoltaic power generation component 11 is less than the power consumption of the power load 20, and the energy storage capacity of the energy storage component 12 meets the discharge conditions, the photovoltaic power generation component 11 and the energy storage component 12 can be controlled to jointly supply power to the power load 20 to meet the power demand of the power load 20 in the offshore off-grid power system. If the energy storage capacity of the energy storage component 12 does not meet the discharge conditions, at this time, the supply and demand balance of the power grid can only be achieved by reducing the power consumption of the power load 20. For example, the non-essential power consumption loads (such as air conditioning loads, fan loads, etc.) in the power load 20 can be controlled to be turned off or some of the loads in the power load 20 can be controlled to be adjusted to standby mode to reduce the power consumption of the power load. In this way, the supply and demand relationship of electricity consumption in the offshore off-grid power system can be balanced, so that the power load 20 of the offshore off-grid power system can be stably supplied with power.

[0075] Reference Figure 4 , Figure 4 It is a third flow chart of the power distribution method provided in one embodiment of the present application, which is executed by the distribution box 16, including but not limited to steps S410 to S4110.

[0076] Step S410, detecting whether the output power of the inverter is greater than the power consumption of the power load;

[0077] Step S420, if the output power of the inverter is greater than the power consumption of the power load, detecting whether the energy storage capacity of the energy storage component meets the charging condition;

[0078] Step S430, if the energy storage capacity of the energy storage component meets the charging condition, determine whether a first difference between the output power of the inverter and the power consumption of the power load is greater than the maximum charging power;

[0079] Step S440: If the first difference between the output power of the inverter and the power consumption of the power load is greater than the maximum charging power, the energy storage converter is controlled to charge the energy storage component at the maximum charging power, and the power adjustable consumption box is controlled to operate at the first consumption power, wherein the first consumption power is equal to the first difference minus the maximum charging power;

[0080] Step S450: If the first difference between the output power of the inverter and the power consumption of the power load is less than or equal to the maximum charging power, the energy storage converter is controlled to charge the energy storage component with the first charging power, and the power adjustable consumption box is controlled not to work;

[0081] Step S460: If the energy storage capacity of the energy storage component does not meet the charging condition, the energy storage converter is controlled not to work, and the power adjustable consumption box is controlled to work at a second consumption power, wherein the second consumption power is equal to the first difference;

[0082] Step S470, detecting whether the output power of the inverter is less than the power consumption of the power load;

[0083] Step S480, if the output power of the inverter is less than the power consumption of the power load, detecting whether the energy storage capacity of the energy storage component meets the discharge condition;

[0084] Step S490: If the energy storage capacity of the energy storage component meets the discharge condition, the energy storage converter is controlled to discharge the energy storage component at a first discharge power, and the power adjustable consumption box is controlled not to work;

[0085] Step S4100: If the energy storage capacity of the energy storage component does not meet the discharge condition, the power consumption of the power load is controlled to be reduced until the power consumption of the power load is equal to the output power of the inverter;

[0086] Step S4110: If the output power of the inverter is equal to the power consumption of the power load, the energy storage converter and the power adjustable consumption box are controlled not to work.

[0087] In the embodiment of the present application, when the power generation of the photovoltaic power generation component 11 is greater than the power consumption of the power load 20, and there is still power left after the power generation of the photovoltaic power generation component 11 is used to power the power load 20 and to charge the energy storage component 12, the power generation of the photovoltaic power generation component 11 can be controlled to be allocated to power the power load 20 and to charge the energy storage component 12 and to be consumed by the power adjustable consumption box 15, so that the power generation of the photovoltaic power generation component 11 can be fully utilized and absorbed. When the power generation of the photovoltaic power generation component 11 is greater than the power consumption of the power load 20, and the power generation of the photovoltaic power generation component 11 is only enough to power the power load 20 and to charge the energy storage component 12, the power generation of the photovoltaic power generation component 11 can be controlled to be allocated to power the power load 20 and to charge the energy storage component 12, so that the power generation of the photovoltaic power generation component 11 can be fully utilized and absorbed. When the power generation of the photovoltaic power generation component 11 is greater than the power consumption of the power load 20, and the energy storage capacity of the energy storage component 12 does not meet the charging conditions, the power generation of the photovoltaic power generation component 11 is controlled to be allocated to supply power to the power load 20 and be absorbed by the power adjustable absorption box 15, so that the power generation of the photovoltaic power generation component 11 can be fully utilized and absorbed. When the power generation of the photovoltaic power generation component 11 is less than the power consumption of the power load 20, and the energy storage capacity of the energy storage component 12 meets the discharge conditions, the photovoltaic power generation component 11 and the energy storage component 12 can be controlled to jointly supply power to the power load 20 to meet the power demand of the power load in the offshore off-grid power system. When the power generation of the photovoltaic power generation component 11 is less than the power consumption of the power load 20, and the energy storage capacity of the energy storage component 12 does not meet the discharge conditions, the power consumption of the power load 20 can be controlled to be reduced to balance the supply and demand relationship of electricity in the offshore off-grid power system. When the power generation of the photovoltaic power generation assembly 11 is equal to the power consumption of the power load 20, the power generation of the photovoltaic power generation assembly 11 is controlled to be fully used to supply power to the power load 20, so that the power generation of the photovoltaic power generation assembly 11 can be fully utilized. In this way, the supply and demand relationship of the power consumption of the offshore off-grid power system can be balanced, so that the power load 20 of the offshore off-grid power system can be stably supplied with power.

[0088] Reference Figure 5 , Figure 5 It is the fourth flow chart of the power distribution method provided in one embodiment of the present application, which is executed by the distribution box 16, including but not limited to steps S510 to S530.

[0089] Step S510, when the power generation of the photovoltaic power generation component is controlled to be allocated to supply power to the power load and be absorbed by the power adjustable consumption box, if the output power of the inverter increases suddenly, and the energy storage capacity of the energy storage component meets the charging condition, the energy storage converter is controlled to charge the energy storage component with a second charging power, and the power adjustable consumption box is controlled to start power loading, and the second charging power is equal to the sudden increase of the output power;

[0090] Step S520, when the power of the power-adjustable consumption box is controlled to be loaded to the third consumption power, the power of the energy storage converter is controlled to be adjusted to 0, and the third consumption power is equal to the output power after the sudden increase minus the power consumption;

[0091] Step S530, when the output power of the inverter increases slowly, the power of the adjustable power consumption box is controlled to increase slowly following the change of the output power of the inverter, so as to keep the output power of the inverter always equal to the working power of the adjustable power consumption box plus the power consumption of the electrical load.

[0092] In the embodiment of the present application, when the power generation of the photovoltaic power generation component 11 is allocated to supply power to the power load 20 and to be absorbed by the power adjustable consumption box 15, if it is detected that the output power of the inverter 14 increases suddenly, that is, the power generation of the photovoltaic power generation component 11 increases suddenly, at this time, if the energy storage capacity of the energy storage component 12 meets the charging conditions, such as the energy storage capacity of the energy storage component 12 is less than 60%, it can be charged. For example, if the energy storage capacity of the energy storage component 12 is between 60% and 70%, it can be charged or discharged. Then the energy storage converter 13 is controlled to charge the energy storage component 12 with the second charging power, and the second charging power is equal to the sudden increase in output power, that is, the energy storage component 12 is controlled to quickly absorb the sudden increase in power of the inverter 14. At the same time, the power adjustable consumption box 15 is controlled to start power loading, and when the power of the power adjustable consumption box 15 is loaded to the third absorption power, the power of the energy storage converter 13 is controlled to be adjusted to 0, that is, the energy storage converter 13 is controlled not to work, and the energy storage component 12 stops charging. The third absorption power is equal to the output power after the sudden increase minus the power consumption of the power load 20. That is, the power adjustable absorption box 15 is controlled to absorb the excess power.

[0093] In the embodiment of the present application, considering that the power of the power-adjustable consumption box 15 is gradually changing, such as gradually increasing or decreasing, it is impossible to achieve a sudden change in power, that is, it is impossible to achieve a sudden increase or decrease in power. Therefore, when the power generation of the photovoltaic power generation component 11 is allocated to supply power to the power load 20 and to be consumed by the power-adjustable consumption box 15, if a sudden increase in the output power of the inverter 14 is detected, since the power of the power-adjustable consumption box 15 cannot increase suddenly with the sudden increase in the output power of the inverter 14, it is necessary to control the energy storage component 12 to quickly absorb the sudden increase in the power of the inverter 14. When the power of the power-adjustable consumption box 15 is loaded to be able to consume the excess power after supplying power to the power load 20, the energy storage component 12 is controlled to stop charging, that is, the excess power is absorbed by the power-adjustable consumption box 15. In this way, the stability of the power supply to the power load 20 can be prevented from being affected by the sudden increase in the power generation of the photovoltaic power generation component 11. In the case where the power generation of the photovoltaic power generation assembly 11 is allocated to supply power to the power load 20 and to be absorbed by the power adjustable consumption box 15, if the output power of the inverter 14 increases slowly, the power of the power adjustable consumption box 15 is controlled to increase slowly following the change of the output power of the inverter 14, so as to keep the output power of the inverter 14 always equal to the working power of the power adjustable consumption box 15 plus the power consumption of the power load 20. That is, in the case where the output power of the inverter 14 increases slowly, the power supply stability can be guaranteed by controlling the power of the power adjustable consumption box 15 to increase slowly following the change of the output power of the inverter 14.

[0094] Reference Figure 6 , Figure 6 It is the fifth flow chart of the power distribution method provided in one embodiment of the present application, which is executed by the distribution box 16, including but not limited to steps S610 to S630.

[0095] Step S610, when the power generation of the photovoltaic power generation component is controlled to be allocated to supply power to the power load and be absorbed by the power adjustable absorption box, if the output power of the inverter suddenly decreases, and the energy storage capacity of the energy storage component meets the discharge condition, the energy storage converter is controlled to discharge the energy storage component at a second discharge power, and the power adjustable absorption box is controlled to start power load reduction, and the second discharge power is equal to the sudden decrease in output power;

[0096] Step S620, when the power of the power-adjustable consumption box is controlled to be reduced to the fourth consumption power, the power of the energy storage converter is controlled to be adjusted to 0, and the fourth consumption power is equal to the output power after the sudden reduction minus the power consumption;

[0097] Step S630, when the output power of the inverter decreases slowly, the power of the adjustable power consumption box is controlled to decrease slowly following the change of the output power of the inverter, so as to keep the output power of the inverter always equal to the working power of the adjustable power consumption box plus the power consumption of the electrical load.

[0098] In the embodiment of the present application, when the power generation of the photovoltaic power generation component 11 is allocated to supply power to the power load 20 and to be absorbed by the power adjustable consumption box 15, if it is detected that the output power of the inverter 14 is suddenly reduced, that is, the power generation of the photovoltaic power generation component 11 is suddenly reduced, at this time, if the energy storage capacity of the energy storage component meets the discharge conditions, such as the energy storage capacity of the energy storage component is greater than or equal to 90%, it can be discharged. For example, if the energy storage capacity of the energy storage component is between 60% and 70%, it can be charged or discharged. Then the energy storage converter 13 is controlled to discharge the energy storage component 12 at the second discharge power, and the second discharge power is equal to the sudden reduction in output power, that is, the energy storage component 12 is controlled to quickly supplement the power of the inverter 14. At the same time, the power adjustable consumption box 15 is controlled to start power reduction, and when the power of the power adjustable consumption box 15 is reduced to the fourth absorption power, the power of the energy storage converter 13 is controlled to be adjusted to 0, that is, the energy storage converter 13 is controlled not to work, and the energy storage component 12 stops discharging. The fourth absorption power is equal to the output power after the sudden reduction minus the power consumption, that is, the power adjustable absorption box 15 is controlled to absorb the excess power.

[0099] In the embodiment of the present application, considering that the power of the power adjustable consumption box 15 is gradual, such as gradually increasing or decreasing, it is impossible to achieve a sudden change in power, that is, it is impossible to achieve a sudden increase or decrease in power. Therefore, when the power generation of the photovoltaic power generation component 11 is allocated to supply power to the power load 20 and to be consumed by the power adjustable consumption box 15, if it is detected that the output power of the inverter 14 is suddenly reduced, since the power of the power adjustable consumption box 15 cannot be reduced with the sudden decrease in the output power of the inverter 14, it is necessary to control the energy storage component 12 to quickly supplement the sudden power reduction of the inverter 14. When the power of the power adjustable consumption box 15 is reduced to be able to consume the excess power after supplying power to the power load 20, the energy storage component 12 is controlled to stop discharging, that is, the excess power is absorbed by the power adjustable consumption box 15. In this way, it can be prevented that the stability of power supply to the power load 20 is affected by the sudden decrease in the power generation of the photovoltaic power generation component 11. In the case where the power generation of the photovoltaic power generation assembly 11 is allocated to supply power to the power load 20 and to be absorbed by the power adjustable consumption box 15, if the output power of the inverter 14 decreases, the power of the power adjustable consumption box 15 is controlled to decrease slowly following the change of the output power of the inverter 14, so as to keep the output power of the inverter 14 always equal to the working power of the power adjustable consumption box 15 plus the power consumption of the power load 20. That is, in the case where the output power of the inverter 14 decreases slowly, the power supply stability can be guaranteed by controlling the power of the power adjustable consumption box 15 to decrease slowly following the change of the output power of the inverter 14.

[0100] In some embodiments, the distribution box 16 can not only reasonably distribute the power generation of the photovoltaic power generation assembly 11 to improve the stability of the offshore off-grid power supply, but also measure the real-time power generation of the photovoltaic power generation assembly 11. Specifically, the distribution box 16 can adjust the working power of the power-adjustable consumption box 15 and / or the power of the energy storage converter 13 according to the power consumption of the power load 20 to determine the output power of the inverter 14, so that the real-time power generation of the photovoltaic power generation assembly 11 can be calculated based on the real-time output power of the inverter 14, wherein the output power of the inverter 14 is equal to the power consumption of the power load 20 plus the charging power of the energy storage converter 13 plus the consumption power of the power-adjustable consumption box 15, or the output power of the inverter 14 is equal to the power consumption of the power load minus the discharge power of the energy storage converter 13.

[0101] Reference Figure 7 , Figure 7 It is a first step flow chart of determining the inverter output power provided by an embodiment of the present application, which is executed by the distribution box 16, including but not limited to steps S710 to S740.

[0102] Step S710, obtaining the power consumption of the power load when the power generation of the photovoltaic power generation assembly can meet the normal operation of the power load;

[0103] Step S720, when the power load operates normally, controlling the energy storage converter to charge the energy storage component with a set charging power;

[0104] Step S730, adjusting the power of the power-adjustable consumption box until it is detected that the power load changes from normal operation to abnormality, and obtaining the consumption power of the power-adjustable consumption box in the current state;

[0105] Step S740, adding the set charging power, power consumption power and absorption power to obtain the output power of the inverter.

[0106] In the embodiment of the present application, when the power generation of the photovoltaic power generation component 11 can meet the normal operation of the power load 20, the power generation of the photovoltaic power generation component 11 can be allocated to supply power to the power load 20, charge the energy storage component 12, and be absorbed by the power adjustable absorption box 15. At this time, the output power of the inverter 14 is equal to the power consumption of the power load 20 plus the charging power of the energy storage converter 13 plus the absorption power of the power adjustable absorption box 15. Therefore, the power consumption of the power load 20 can be obtained first, and then the energy storage converter 13 can be controlled to charge the energy storage component 12 with the set charging power, and then the power of the power adjustable absorption box 15 can be adjusted until it is detected that the power load 20 changes from normal operation to abnormality, and the absorption power of the power adjustable absorption box 15 in the current state is obtained, so that the set charging power, power consumption power and absorption power can be added to obtain the output power of the inverter. In the embodiment of the present application, by providing a power adjustable consumption box 15 , the output power of the inverter 14 can be calculated, and thus the power generation of the photovoltaic power generation assembly 11 can be further calculated.

[0107] It should be noted that, when the power generation of the photovoltaic power generation component 11 can meet the normal operation of the power load 20, if the power generation of the photovoltaic power generation component 11 is used to supply power to the power load 20, and the remaining power can only be used to charge the energy storage component 12, that is, when the power adjustable consumption box 15 is not needed for consumption, the power consumption of the power load 20 can be obtained first, and then the charging power of the energy storage inverter 13 can be adjusted until it is detected that the power load 20 changes from normal operation to abnormality, and the charging power of the energy storage inverter 13 in the current state is obtained, so that the power consumption of the power load 20 and the charging power of the energy storage inverter 13 can be added to obtain the output power of the inverter 14.

[0108] Reference Figure 8 , Figure 8 It is a second step flowchart of determining the inverter output power provided by an embodiment of the present application, which is executed by the distribution box 16, including but not limited to steps S810 to S830.

[0109] Step S810, when the power generation of the photovoltaic power generation component cannot meet the power consumption of the power load, control and adjust the discharge power of the energy storage converter to allow the energy storage component to discharge, until it is detected that the power load is operating normally, and obtain the discharge power of the energy storage converter in the current state;

[0110] Step S820, obtaining the power consumption of the power load under normal operation;

[0111] Step S830: subtract the discharge power from the power consumption to obtain the output power of the inverter.

[0112] In the embodiment of the present application, when the power generation of the photovoltaic power generation component 11 cannot meet the normal operation of the power load 20, that is, the power generation of the photovoltaic power generation component 11 is less than the power consumption of the power load 20, at this time, the power generation of the photovoltaic power generation component 11 can be allocated to supply power to the power load 20 together with the discharge of the energy storage component 12. At this time, the output power of the inverter 14 is equal to the power consumption of the power load 20 minus the discharge power of the energy storage converter 13. Therefore, the power consumption of the power load 20 can be obtained first, and then the discharge power of the energy storage converter 13 can be controlled to allow the energy storage component 12 to discharge until the power load 20 is detected to be operating normally, and the discharge power of the energy storage converter 13 in the current state is obtained, so that the power consumption can be subtracted from the discharge power to obtain the output power of the inverter. In the embodiment of the present application, the output power of the inverter 14 can be obtained by adjusting the discharge power of the energy storage converter 13, so that the power generation of the photovoltaic power generation component 11 can be further calculated.

[0113] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A power distribution system for offshore off-grid photovoltaic power generation, It is characterized in that The invention comprises a photovoltaic power generation component, an energy storage component, an energy storage converter, an inverter, a power adjustable consumption box and a distribution box, wherein the photovoltaic power generation component is connected to the first end of the inverter, the second end of the inverter is connected to the first end of the distribution box, the second end of the distribution box is connected to the first end of the energy storage converter, the second end of the energy storage converter is connected to the energy storage component, the third end of the distribution box is connected to the power adjustable consumption box, and the fourth end of the distribution box is used to connect the power load; wherein the distribution box is configured as follows: The power of the energy storage converter and / or the power adjustable consumption box is adjusted and controlled according to the output power of the inverter, the energy storage capacity of the energy storage component and the power consumption of the electrical load to provide stable power supply to the electrical load.

2. The power distribution system according to claim 1, It is characterized in that The step of adjusting the power of the energy storage converter and / or the power adjustable consumption box according to the output power of the inverter, the energy storage capacity of the energy storage component and the power consumption of the power load to provide stable power supply to the power load includes: When the output power of the inverter is greater than the power consumption of the power load, and the energy storage capacity of the energy storage component meets the charging condition, it is determined whether a first difference between the output power and the power consumption is greater than a maximum charging power; If the first difference is greater than the maximum charging power, the energy storage converter is adjusted to charge the energy storage component with the maximum charging power, and the power-adjustable consumption box is adjusted to operate with the first consumption power, so as to control the power generation of the photovoltaic power generation component to be distributed to supply power to the power load, charge the energy storage component, and be consumed by the power-adjustable consumption box, and the first consumption power is equal to the first difference minus the maximum charging power; If the first difference is less than or equal to the maximum charging power, the energy storage converter is adjusted to charge the energy storage component with the first charging power, and the power adjustable consumption box is adjusted not to work, so as to control the power generation of the photovoltaic power generation component to be distributed to supply power to the power load and charge the energy storage component, and the first charging power is equal to the output power minus the power consumption power; When the output power of the inverter is greater than the power consumption of the electrical load, but the energy storage capacity of the energy storage component does not meet the charging conditions, the power of the energy storage inverter is adjusted to 0, and the power-adjustable consumption box is adjusted to operate at a second consumption power to control the power generation of the photovoltaic power generation component to be distributed to supply power to the electrical load and to be consumed by the power-adjustable consumption box, and the second consumption power is equal to the first difference.

3. The power distribution system according to claim 1 or 2, It is characterized in that The step of adjusting the power of the energy storage converter and / or the power adjustable consumption box according to the output power of the inverter, the energy storage capacity of the energy storage component and the power consumption of the power load to provide stable power supply to the power load includes: When the output power of the inverter is less than the power consumption of the power load, and the energy storage capacity of the energy storage component meets the discharge condition, the energy storage converter is adjusted to discharge the energy storage component at a first discharge power, and the power adjustable consumption box is adjusted not to work, so as to control the photovoltaic power generation component and the energy storage component to jointly supply power to the power load, and the first discharge power is equal to the power consumption minus the output power; When the output power of the inverter is equal to the power consumption of the power load, the power of the energy storage converter is adjusted to 0, and the power adjustable consumption box is adjusted to not work, so as to control the photovoltaic power generation group to supply power to the power load.

4. The power distribution system according to claim 2, It is characterized in that In the case where the power generation of the photovoltaic power generation assembly is controlled to be distributed to supply power to the power load and to be consumed by the power adjustable consumption box, the power distribution box is further configured as follows: When the output power of the inverter increases suddenly, and the energy storage capacity of the energy storage component meets the charging condition, the energy storage converter is controlled to charge the energy storage component with a second charging power, and the power adjustable consumption box is controlled to start power loading, and the second charging power is equal to the sudden increase of the output power; When the power of the power-adjustable consumption box is loaded to the third consumption power, the power of the energy storage converter is controlled to be adjusted to 0, and the third consumption power is equal to the output power after the sudden increase minus the power consumption.

5. The power distribution system according to claim 2 or 4, It is characterized in that In the case where the power generation of the photovoltaic power generation assembly is controlled to be distributed to supply power to the power load and to be consumed by the power adjustable consumption box, the power distribution box is further configured as follows: When the output power of the inverter increases slowly, the power of the power-adjustable consumption box is controlled to increase slowly following the change of the output power of the inverter, so as to keep the output power of the inverter always equal to the working power of the power-adjustable consumption box plus the power consumption of the electrical load.

6. The power distribution system according to claim 2, It is characterized in that In the case where the power generation of the photovoltaic power generation assembly is controlled to be distributed to supply power to the power load and to be consumed by the power adjustable consumption box, the power distribution box is further configured as follows: When the output power of the inverter suddenly decreases, and the energy storage capacity of the energy storage component meets the discharge condition, the energy storage converter is controlled to discharge the energy storage component at a second discharge power, and the power adjustable consumption box is controlled to start power load reduction, and the second discharge power is equal to the sudden decrease in the output power; When the power of the power-adjustable consumption box is reduced to a fourth consumption power, the power of the energy storage converter is controlled to be adjusted to 0, and the fourth consumption power is equal to the output power after the sudden reduction minus the power consumption.

7. The power distribution system according to claim 2 or 6, It is characterized in that In the case where the power generation of the photovoltaic power generation assembly is controlled to be distributed to supply power to the power load and to be consumed by the power adjustable consumption box, the power distribution box is further configured as follows: When the output power of the inverter decreases, the power of the power-adjustable consumption box is controlled to decrease slowly following the change of the output power of the inverter, so as to keep the output power of the inverter always equal to the working power of the power-adjustable consumption box plus the power consumption of the electrical load.

8. The power distribution system according to claim 1, It is characterized in that The distribution box is also configured as: According to the power consumption of the electrical load, the working power of the power adjustable consumption box and / or the power of the energy storage converter is adjusted to determine the output power of the inverter.

9. The power distribution system according to claim 8, It is characterized in that The step of adjusting the working power of the power-adjustable consumption box and / or the power of the energy storage converter according to the power consumption of the power load to determine the output power of the inverter includes: When the power generation of the photovoltaic power generation assembly can meet the normal operation of the power load, obtaining the power consumption of the power load; When the power load is operating normally, controlling the energy storage converter to charge the energy storage component with a set charging power; The power of the power-adjustable consumption box is adjusted until it is detected that the power load changes from normal operation to abnormality, and the consumption power of the power-adjustable consumption box in the current state is obtained; The set charging power, the power consumption and the absorption power are added together to obtain the output power of the inverter.

10. The power distribution system according to claim 8, It is characterized in that The step of adjusting the working power of the power-adjustable consumption box and / or the power of the energy storage converter according to the power consumption of the power load to determine the output power of the inverter includes: When the power generation of the photovoltaic power generation component cannot meet the power consumption of the power load, control and adjust the discharge power of the energy storage converter to discharge the energy storage component until the power load is detected to be operating normally, and obtain the discharge power of the energy storage converter in the current state; Obtaining the power consumption of the power load under normal operation; The output power of the inverter is obtained by subtracting the discharge power from the power consumption.

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