Direct current power distribution system

Abstract

The application discloses a direct current power distribution system, and belongs to the technical field of power supply. The direct current power distribution system comprises an AC-DC voltage converter, a bidirectional DC voltage converter, an energy storage module, an energy storage manager and a controller. When the residual power of the energy storage module is relatively large, the energy storage module can output direct current to the power utilization equipment, thereby providing power for the power utilization equipment. In this way, the time length for which the power utilization equipment is provided with power from the AC bus can be reduced, various problems caused by the AC power distribution system in providing power for the power utilization equipment can be solved to a certain extent, and power supply power quality is improved.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a DC power distribution system. Background Technology

[0002] A power distribution system refers to the section of the power supply system that transmits electrical energy from a substation to the user end. In related technologies, AC power distribution systems are typically used at construction sites for industrial or civil projects, such as building construction, equipment installation, and pipeline laying. AC power distribution systems are used to output alternating current to the electrical equipment used in construction activities.

[0003] However, when using an AC power distribution system to provide power, if the rated power of the load is large, the connection of the load to the AC power distribution system will cause problems such as voltage flicker in the power supply system, resulting in a decrease in the power quality of the power supply system. Summary of the Invention

[0004] This application provides a DC power distribution system that can, to some extent, solve problems such as voltage flicker in the power supply system caused by loads connected to AC power distribution systems in related technologies. The technical solution is as follows:

[0005] In a first aspect, a DC power distribution system is provided, including: an AC-DC voltage converter, a bidirectional DC voltage converter, an energy storage module, an energy storage manager, and a controller;

[0006] The input terminal of the AC / DC voltage converter is used to connect to the AC bus, and the output terminal of the AC / DC voltage converter is connected to the first terminal of the bidirectional DC voltage converter.

[0007] The first end of the bidirectional DC voltage converter is also used to connect to electrical equipment, and the second end of the bidirectional DC voltage converter is connected to the energy storage module.

[0008] The detection terminal of the energy storage manager is connected to the energy storage module to detect the remaining power of the energy storage module, and the output terminal of the energy storage manager is connected to the controller to output the remaining power to the controller.

[0009] The controller is also connected to the control terminal of the AC / DC voltage converter and the control terminal of the bidirectional DC voltage converter. The controller is configured to: if the remaining power is within a first power range, control the AC / DC voltage converter and the bidirectional DC voltage converter to operate, so that the AC / DC voltage converter outputs power to the electrical device and outputs power to the energy storage module through the bidirectional DC voltage converter; if the remaining power is within a second power range, control the bidirectional DC voltage converter to operate, so that the energy storage module outputs power to the electrical device through the bidirectional DC voltage converter; the maximum value of the first power range is less than the minimum value of the second power range.

[0010] In this application, the DC power distribution system includes an AC-DC voltage converter, a bidirectional DC voltage converter, an energy storage module, an energy storage manager, and a controller. The AC-DC voltage converter is connected between the AC bus and a first terminal of the bidirectional DC voltage converter. The first terminal of the bidirectional DC voltage converter is also connected to the electrical equipment. The second terminal of the bidirectional DC voltage converter is connected to the energy storage module. The detection terminal of the energy storage manager is connected to the energy storage module and is used to detect the remaining power of the energy storage module and output the remaining power to the controller. The controller is used to control the operation of the AC-DC voltage converter and the bidirectional DC voltage converter. When the DC power distribution system is operating: if the remaining power of the energy storage module is within a first power range with relatively low power, the controller controls the AC-DC voltage converter and the bidirectional DC voltage converter to operate, so that the AC-DC voltage converter obtains electrical energy from the AC bus and outputs electrical energy to the electrical equipment, and charges the energy storage module through the bidirectional DC voltage converter; if the remaining power of the energy storage module is within a second power range with relatively high power, the controller controls the bidirectional DC voltage converter to operate, so that the energy storage module outputs electrical energy to the electrical equipment through the bidirectional DC voltage converter. This DC power distribution system can supply power to electrical equipment when the energy storage module has a large remaining charge. This reduces the time that electrical equipment relies on the AC bus for power, thus mitigating some of the problems associated with AC power distribution systems and improving power quality.

[0011] Optionally, the DC power distribution system further includes: a battery swapping cabinet, wherein the bidirectional DC voltage converter, the energy storage manager, and the energy storage module are all located within the battery swapping cabinet;

[0012] The energy storage module includes a first energy storage unit and a second energy storage unit connected in parallel. The first energy storage unit is fixedly connected to the battery swapping cabinet, and the second energy storage unit is detachably connected to the battery swapping cabinet.

[0013] Optionally, the DC power distribution system further includes: a photovoltaic generator and a unidirectional DC voltage converter;

[0014] The output terminal of the photovoltaic generator is connected to the input terminal of the unidirectional DC voltage converter, and the output terminal of the unidirectional DC voltage converter is connected to the first terminal of the bidirectional DC voltage converter and the electrical equipment.

[0015] The controller is also connected to the output terminal of the photovoltaic generator to detect the output power of the photovoltaic generator. The controller is configured to: if the remaining power is within the first power range and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, control the AC-DC voltage converter, the bidirectional DC voltage converter and the unidirectional DC voltage converter to operate so that the AC-DC voltage converter and the unidirectional DC voltage converter output electrical energy to the electrical equipment, and output electrical energy to the energy storage module through the bidirectional DC voltage converter.

[0016] Optionally, the controller is configured to: if the current time is within a first time period, the remaining power is within the first power range, and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, then control the AC / DC voltage converter, the bidirectional DC voltage converter, and the unidirectional DC voltage converter to operate, so that the AC / DC voltage converter and the unidirectional DC voltage converter output electrical energy to the electrical equipment, and output electrical energy to the energy storage module through the bidirectional DC voltage converter.

[0017] Optionally, the controller is further configured to: if the remaining power is within a third power range and the output power of the photovoltaic generator is equal to the rated power of the electrical equipment, then control the unidirectional DC voltage converter to operate so that the unidirectional DC voltage converter outputs electrical energy to the electrical equipment; the minimum value of the third power range is greater than the maximum value of the first power range, and the maximum value of the third power range is greater than the minimum value of the second power range.

[0018] Optionally, the controller is further configured to: if the remaining power is within a third power range and the output power of the photovoltaic generator is greater than the rated power of the electrical equipment, control the unidirectional DC-DC converter and the bidirectional DC-DC converter to operate, so that the unidirectional DC-DC converter outputs electrical energy to the electrical equipment and outputs electrical energy to the energy storage module through the bidirectional DC-DC converter; the minimum value of the third power range is greater than the maximum value of the first power range, and the maximum value of the third power range is greater than the minimum value of the second power range.

[0019] Optionally, the DC power distribution system further includes: a photovoltaic monitor;

[0020] The input terminal of the photovoltaic monitor is connected to the second terminal of the bidirectional DC-DC voltage converter, and the output terminal of the photovoltaic monitor is connected to the energy storage module.

[0021] The controller is also connected to the photovoltaic monitor, and the controller is further configured to: if the remaining power is within the third power range and the output power of the photovoltaic generator is greater than the rated power of the electrical equipment, then control the photovoltaic monitor to operate so that the bidirectional DC voltage converter outputs electrical energy to the energy storage module through the photovoltaic monitor;

[0022] When the photovoltaic monitor is working, it detects the amount of electricity, current and voltage output by the bidirectional DC voltage converter; the minimum value of the third electricity range is greater than the maximum value of the first electricity range, and the maximum value of the third electricity range is greater than the minimum value of the second electricity range.

[0023] Optionally, the controller is further configured to: if the remaining power is within the second power range and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, control the unidirectional DC voltage converter and the bidirectional DC voltage converter to operate so that both the unidirectional DC voltage converter and the bidirectional DC voltage converter output electrical energy to the electrical equipment.

[0024] Optionally, the controller is further configured to: if the current time is within a first time period, the remaining power is within a third power range, and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, then control the AC / DC voltage converter, the unidirectional DC voltage converter, and the bidirectional DC voltage converter to operate, so that the AC / DC voltage converter and the unidirectional DC voltage converter output electrical energy to the electrical equipment, and output electrical energy to the energy storage module through the bidirectional DC voltage converter; the minimum value of the third power range is greater than the maximum value of the first power range, and the maximum value of the third power range is greater than the minimum value of the second power range.

[0025] Optionally, the controller is further configured to: if the current time is within a second time period, the remaining power is within the third power range, and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, then control the unidirectional DC voltage converter and the bidirectional DC voltage converter to operate so that both the unidirectional DC voltage converter and the bidirectional DC voltage converter output electrical energy to the electrical equipment. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the first DC power distribution system provided in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the structure of a battery swapping cabinet provided in an embodiment of this application;

[0029] Figure 3 This is a schematic diagram of the structure of the second type of DC power distribution system provided in the embodiments of this application;

[0030] Figure 4 This is a schematic diagram of the structure of the third DC power distribution system provided in the embodiments of this application;

[0031] Figure 5 This is a schematic diagram of the structure of the fourth DC power distribution system provided in the embodiments of this application.

[0032] The meanings of the various symbols in the attached icons are as follows:

[0033] 10. DC power distribution system;

[0034] 12. DC bus;

[0035] 122. Positive busbar;

[0036] 124. Negative busbar;

[0037] 14. Battery swapping cabinet;

[0038] 1402, Insulation layer;

[0039] 1404. Energy storage protection device;

[0040] 110. AC / DC voltage converter;

[0041] 120. Bidirectional DC-DC voltage converter;

[0042] 130. Energy storage module;

[0043] 132. First energy storage unit;

[0044] 134. Second energy storage unit;

[0045] 140. Energy storage manager;

[0046] 150. Controller;

[0047] 160. Photovoltaic generator;

[0048] 162. DC combiner box;

[0049] 170. Unidirectional DC-DC voltage converter;

[0050] 180. Photovoltaic monitor;

[0051] 20. AC busbar;

[0052] 30. Electrical equipment;

[0053] 310. Distribution cabinet;

[0054] 320. Low-voltage DC electrical equipment;

[0055] 330. High-voltage DC electrical equipment. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0057] It should be understood that "multiple" as mentioned in this application refers to two or more. In the description of this application, unless otherwise stated, " / " indicates "or," for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist, for example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, to facilitate a clear description of the technical solutions of this application, the terms "first," "second," etc., are used to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and that "first," "second," etc., do not necessarily imply differences.

[0058] The DC power distribution system provided in the embodiments of this application will be explained in detail below. In the embodiments of this application, the connection between two electrical devices refers to an electrical connection. Here, an electrical connection means that two electrical devices are connected by a wire to realize the transmission of electrical energy.

[0059] Figure 1 This is a schematic diagram of the structure of a DC power distribution system 10 provided in an embodiment of this application. See also... Figure 1 As shown, the DC power distribution system 10 includes: an AC-DC voltage converter 110, a bidirectional DC voltage converter 120, an energy storage module 130, an energy storage manager 140, and a controller 150.

[0060] An AC / DC voltage converter 110 refers to a converter that rectifies alternating current (AC) into direct current (DC) and performs voltage transformation on the AC before rectification and / or the DC after rectification. For example, the AC / DC voltage converter 110 may include a transformer and a full-bridge rectifier connected in sequence. The transformer performs voltage transformation on the AC, and the full-bridge rectifier rectifies the voltage-transformed AC into DC. The AC / DC voltage converter 110 has an input terminal and an output terminal. The input terminal of the AC / DC voltage converter 110 is connected to the AC bus 20, and the output terminal is connected to the first terminal of the bidirectional DC voltage converter 120 and the electrical device 30. Thus, when the AC / DC voltage converter 110 is operating, it can obtain electrical energy (AC) from the AC bus 20 and output electrical energy (DC) to the bidirectional DC voltage converter 120 and the electrical device 30. In some specific embodiments, the AC / DC voltage converter 110 is used to convert 10kV AC into 375V DC.

[0061] A bidirectional DC-DC voltage converter 120 is a converter used to transform DC power into DC power. The bidirectional DC-DC voltage converter 120 has a first terminal and a second terminal. When the bidirectional DC-DC voltage converter 120 is operating, the first terminal can be used as the input DC power and the second terminal as the output DC power; alternatively, the second terminal can be used as the input DC power and the first terminal as the output DC power. For example, the bidirectional DC-DC voltage converter 120 can be a Boost-Buck circuit (a step-up / step-down converter circuit). The Boost-Buck circuit can operate in either boost or buck mode. When the first terminal of the Boost-Buck circuit is used as the input DC power and the second terminal as the output DC power, the Boost-Buck circuit operates in buck mode; when the second terminal of the Boost-Buck circuit is used as the input DC power and the first terminal as the output DC power, the Boost-Buck circuit operates in boost mode. The first terminal of the bidirectional DC-DC voltage converter 120 is connected to the output terminal of the AC-DC voltage converter 110 and electronic equipment. The second terminal of the bidirectional DC-DC voltage converter 120 is connected to the energy storage module 130. Thus, when the bidirectional DC voltage converter 120 is working, in one case, it can obtain the electrical energy (DC) output from the AC-DC voltage converter 110 and output electrical energy (DC) to the energy storage module 130; in another case, it can obtain the electrical energy (DC) output from the energy storage module 130 and output electrical energy (DC) to the electrical device 30.

[0062] The energy storage manager 140 can be a System on Chip (SOC) that stores a Battery Management System (BMS). When the energy storage manager 140 is operating, it can detect the operating status of the energy storage module 130, including parameters such as remaining charge, voltage, current, and temperature. The energy storage manager 140 has a detection terminal and an output terminal. The detection terminal of the energy storage manager 140 is connected to the energy storage module 130 to detect the remaining charge of the energy storage module 130. The output terminal of the energy storage manager 140 is connected to the controller 150 to output the detected remaining charge of the energy storage module 130 to the controller 150.

[0063] The controller 150 may be a system-on-a-chip (SoC) storing a preset program. In this embodiment, the controller 150 is also connected to the control terminal of the AC / DC voltage converter 110 and the control terminal of the bidirectional DC voltage converter 120. The controller 150 is used to control the operation of the AC / DC voltage converter 110 and the bidirectional DC voltage converter 120 according to the remaining power of the energy storage module 130.

[0064] Specifically, the controller 150 may have a first power range and a second power range. The maximum value of the first power range is less than the minimum value of the second power range. In other words, any value in the first power range is less than any value in the second power range. After obtaining the remaining power of the energy storage module 130, if the remaining power is within the first power range, the controller 150 controls the AC-DC voltage converter 110 to operate and controls the first terminal of the bidirectional DC voltage converter 120 to input electrical energy and the second terminal to output electrical energy. In this case, the AC-DC voltage converter 110 obtains AC power from the AC bus 20, outputs electrical energy to the electrical device 30, and outputs electrical energy to the energy storage module 130 through the bidirectional DC voltage converter 120. Thus, it supplies power to the electrical device 30 on one hand and charges the energy storage module 130 on the other. If the remaining power is within the second power range, it only controls the second terminal of the bidirectional DC voltage converter 120 to input electrical energy and the first terminal to output electrical energy. In this case, the AC-DC voltage converter 110 does not operate, and the energy storage module 130 outputs electrical energy to the electrical device 30 through the bidirectional DC voltage converter 120. In other words, when the remaining power of the energy storage module 130 is low, the DC power distribution system 10 draws power from the AC bus 20 to supply power to the electrical equipment 30 and to charge the energy storage module 130. When the remaining power of the energy storage module 130 is high, it can output DC power to the electrical equipment 30, thereby providing power to the electrical equipment 30. This reduces the time the electrical equipment 30 receives power from the AC bus 20, thus mitigating various problems associated with the AC power distribution system supplying power to the electrical equipment 30 and improving the quality of the power supply.

[0065] In some embodiments, such as Figure 1 As shown, the DC power distribution system 10 also includes a DC bus 12. The output terminal of the AC-DC voltage converter 110, the first terminal of the bidirectional DC voltage converter 120, and the electrical equipment 30 are all connected to the DC bus 12, thereby realizing the electrical connection between the output terminal of the AC-DC voltage converter 110, the first terminal of the bidirectional DC voltage converter 120, and the electrical equipment 30.

[0066] In some embodiments, the DC power distribution system 10 further includes a battery swapping cabinet 14. Figure 2 This is a schematic diagram of the battery swapping cabinet 14 provided in an embodiment of this application. Figure 2 As shown, the bidirectional DC voltage converter 120, the energy storage manager 140, and the energy storage module 130 can all be located inside the battery swapping cabinet 14.

[0067] Specifically, the energy storage module 130 may include a first energy storage unit 132 and a second energy storage unit 134. The first energy storage unit 132 and the second energy storage unit 134 are connected in parallel, and both can output electrical energy to the power-consuming device 30 through a bidirectional DC-DC voltage converter 120. In some specific embodiments, the first energy storage unit 132 and the second energy storage unit 134 can be any one of a lithium-ion battery, a lead-acid battery, or a supercapacitor. Figure 2 In the illustrated embodiment, the energy storage module 130 includes two first energy storage units 132 and one second energy storage unit 134. The second energy storage unit 134 may be a lithium-ion battery. One of the two first energy storage units 132 may be a lithium-ion battery and the other a lead-acid battery.

[0068] In this embodiment, the first energy storage unit 132 is located inside and fixedly connected to the battery swapping cabinet 14, so that the first energy storage unit 132 maintains an electrical connection with the second terminal of the bidirectional DC-DC converter 120. The second energy storage unit 134 is detachably connected to the battery swapping cabinet 14, so that the second energy storage unit 134 can be located inside or removed from the battery swapping cabinet 14. When the second energy storage unit 134 is located inside the battery swapping cabinet 14, the second energy storage unit 134 has an electrical connection with the second terminal of the bidirectional DC-DC converter 120; when the second energy storage unit 134 is removed from the battery swapping cabinet 14, the second energy storage unit 134 does not have an electrical connection with the second terminal of the bidirectional DC-DC converter 120. Thus, the second energy storage unit 134 can be taken out from the power swapping cabinet 14 to supply power to other electrical equipment 30 that is not connected to the first terminal of the bidirectional DC voltage converter 120. Since the first energy storage unit 132 and the second energy storage unit 134 are connected in parallel, the removal of the second energy storage unit 134 will not affect the output voltage of the energy storage module 130, thereby improving the flexibility of the DC power distribution system 10.

[0069] Furthermore, such as Figure 2 As shown, the DC power distribution system 10 may further include an energy storage protection device 1404. The energy storage protection device 1404 may also be located within the power swapping cabinet 14. The energy storage protection device 1404 may be connected between the energy storage module 130 and the second terminal of the bidirectional DC-DC voltage converter 120, enabling power transfer between the energy storage module 130 and the bidirectional DC-DC voltage converter 120 via the energy storage protection device 1404. The energy storage protection device 1404 is also connected to the energy storage manager 140 and is controlled by the energy storage manager 140. For example, the energy storage protection device 1404 may include a DC circuit breaker; when the DC circuit breaker in the energy storage protection device 1404 is closed, power transfer between the energy storage module 130 and the bidirectional DC-DC voltage converter 120 is possible; when the DC circuit breaker in the energy storage protection device 1404 is open, power transfer between the energy storage module 130 and the bidirectional DC-DC voltage converter 120 is not possible. When the energy storage manager 140 is working, it monitors the operating status of the energy storage module 130, such as remaining power, voltage, current, and temperature. If the operating status of the energy storage module 130 is abnormal, such as low remaining power, excessive voltage, excessive current, or excessive temperature, the energy storage manager 140 can control the DC circuit breaker in the energy storage protection device 1404 to trip, thereby stopping the energy storage module 130 from outputting or inputting electrical energy, thus protecting the DC power distribution system 10. The battery swapping cabinet 14 may also have a heat insulation layer 1402, which divides the internal space of the battery swapping cabinet 14 into two areas. One area is used to house the energy storage manager 140 and the energy storage module 130, and the other area is used to house the bidirectional DC voltage converter 120 and the energy storage protection device 1404. The presence of the heat insulation layer 1402 can reduce the probability of fire within the battery swapping cabinet 14. In some specific embodiments, when the energy storage manager 140 detects that the energy storage module 130 is in an overcharged state, it controls the energy storage protection device 1404 to shut down after a two-second delay, so that the energy storage module 130 stops charging; when the energy storage manager 140 detects that the energy storage module 130 is in an over-discharged state, it controls the energy storage protection device 1404 to shut down after a two-second delay, so that the energy storage module 130 stops discharging. When the energy storage manager 140 detects that the energy storage module 130 is short-circuited, it immediately controls the energy storage protection device 1404 to shut down.

[0070] In some embodiments, such as Figure 3 As shown, the DC power distribution system 10 also includes a photovoltaic generator 160 and a unidirectional DC voltage converter 170.

[0071] A photovoltaic (PV) generator 160 refers to a converter that converts light energy into electrical energy. For example, the PV generator 160 may include solar panels, etc. The PV generator 160 has an output terminal for outputting electrical energy. The output terminal of the PV generator 160 is connected to the input terminal of a unidirectional DC-DC converter 170. Thus, when the PV generator 160 is operating, it can output electrical energy to the unidirectional DC-DC converter 170. In some specific embodiments, the PV generator 160 may integrate an MPPT (maximum power point tracking) controller 150 to ensure that within a certain range of light intensity, the PV generator 160 can output electrical energy at maximum power; details will not be elaborated further here.

[0072] A unidirectional DC-DC voltage converter 170 is a converter used to transform the voltage of direct current (DC). For example, the unidirectional DC-DC voltage converter 170 can be a Boost circuit (boost converter circuit), which is used to boost the DC voltage and output the boosted DC voltage. The input terminal of the unidirectional DC-DC voltage converter 170 is connected to the output terminal of the photovoltaic generator 160, and the output terminal of the unidirectional DC-DC voltage converter 170 can be connected to the electrical device 30 and the first terminal of the bidirectional DC-DC voltage converter 120. Thus, when the unidirectional DC-DC voltage converter 170 is working, it can obtain the electrical energy output from the photovoltaic generator 160 and output the electrical energy to the electrical device 30. At the same time, after obtaining the electrical energy output from the photovoltaic generator 160, the unidirectional DC-DC voltage converter 170 can also output electrical energy to the energy storage module 130 through the bidirectional DC-DC voltage converter 120.

[0073] The controller 150 can also be connected to the output terminal of the photovoltaic generator 160 to detect the output power of the photovoltaic generator 160 and control the operation of the AC-DC voltage converter 110, the bidirectional DC voltage converter 120, and the unidirectional DC voltage converter 170 based on the output power of the photovoltaic generator 160 and the remaining power of the energy storage module 130.

[0074] Specifically, the controller 150 can store the rated power of the electrical equipment 30. The rated power of the electrical equipment 30 refers to its power when it is operating normally. After obtaining the remaining power of the energy storage module 130 and the output power of the photovoltaic generator 160, if the remaining power is within a first power range and the output power of the photovoltaic generator 160 is less than the rated power of the electrical equipment 30, the controller 150 controls the AC-DC voltage converter 110 and the unidirectional DC voltage converter 170 to operate, and controls the bidirectional DC voltage converter 120 to input electrical energy at its first terminal and output electrical energy at its second terminal. In this case, the unidirectional DC voltage converter 170 obtains the electrical energy output from the photovoltaic generator 160, and the AC-DC voltage converter 110 obtains the AC power from the AC bus 20. The unidirectional DC voltage converter 170 and the AC-DC voltage converter 110 together output electrical energy to the electrical equipment 30, and output electrical energy to the energy storage module 130 through the bidirectional DC voltage converter 120. In this way, the controller supplies power to the electrical equipment 30 on one hand, and charges the energy storage module 130 on the other.

[0075] Furthermore, in some embodiments, in addition to the output power of the photovoltaic generator 160 and the remaining power of the energy storage module 130, the controller 150 can also control the operation of the AC-DC voltage converter 110, the bidirectional DC voltage converter 120, and the unidirectional DC voltage converter 170 according to the current time period.

[0076] Specifically, the controller 150 can have a first time period and a second time period. The difference between the first time period and the second time period is that during the first time period, the DC power distribution system 10 requires fewer resources to obtain power from the AC bus 20; during the second time period, the DC power distribution system 10 requires more resources to obtain power from the AC bus 20. For example, the first time period can be a period of low electricity prices in the area where the DC power distribution system 10 is used, and the second time period can be a period of high electricity prices in the area where the DC power distribution system 10 is used. When controlling the operation of the AC-DC voltage converter 110, the bidirectional DC voltage converter 120, and the unidirectional DC voltage converter 170, the controller 150 can also obtain the current time and control the operation of the AC-DC voltage converter 110, the bidirectional DC voltage converter 120, and the unidirectional DC voltage converter 170 based on the current time period, the output power of the photovoltaic generator 160, and the remaining power of the energy storage module 130.

[0077] The following describes various scenarios, using different embodiments, how the controller 150 controls the operation of the AC / DC voltage converter 110, bidirectional DC voltage converter 120, and unidirectional DC voltage converter 170 based on the output power of the photovoltaic generator 160, the remaining power of the energy storage module 130, and the current time period. It should be noted that in these scenarios, the output power of the photovoltaic generator 160 includes three cases: the output power of the photovoltaic generator 160 is greater than the rated power of the electrical equipment 30, the output power of the photovoltaic generator 160 is equal to the rated power of the electrical equipment 30, and the output power of the photovoltaic generator 160 is less than the rated power of the electrical equipment 30. The remaining power of the energy storage module 130 includes three cases: the remaining power is within a first power range, the remaining power is within a third power range, and the remaining power is within a second power range. Specifically, the minimum value of the third power range is greater than the maximum value of the first power range, and the maximum value of the third power range is greater than the minimum value of the second power range. In this embodiment, when the remaining power of the energy storage module 130 is within the first power range, it indicates that the remaining power of the energy storage module 130 is too low. The energy storage manager 140 can control the energy storage protection device 1404 to prevent the energy storage module 130 from outputting power. When the remaining power of the energy storage module 130 is within the second power range, it indicates that the energy storage module 130 is fully charged. The energy storage manager 140 can control the energy storage protection device 1404 to prevent the energy storage module 130 from inputting power, or the controller 150 can control the bidirectional DC-DC voltage converter 120 to stop outputting power to the energy storage module 130. When the remaining power of the energy storage module 130 is within the third power range, it indicates that the energy storage module 130 is not fully charged but still has a certain amount of power. At this time, the energy storage module 130 can both output and input power. The current time period includes two scenarios: a first time period and a second time period. In the first time period, the DC power distribution system 10 requires fewer resources to obtain power from the AC bus 20; in the second time period, the DC power distribution system 10 requires more resources to obtain power from the AC bus 20.

[0078] In the first scenario, the output power of the photovoltaic generator 160 exceeds the rated power of the electrical equipment 30, and the remaining power is within the first power range, currently falling within the first time period. At this time, the controller 150 controls the unidirectional DC-DC converter 170 to operate and controls the bidirectional DC-DC converter 120 to input electrical energy at its first terminal and output electrical energy at its second terminal. In this case, the AC-DC converter 110 does not operate. The DC power output from the photovoltaic generator 160, after passing through the unidirectional DC-DC converter 170, is output to the electrical equipment 30 to power its operation, and simultaneously output to the energy storage module 130 through the bidirectional DC-DC converter 120 to charge the energy storage module 130.

[0079] In the second scenario, the output power of the photovoltaic generator 160 exceeds the rated power of the electrical equipment 30, and the remaining power is within the first power range, currently falling within the second time period. At this time, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate and controls the bidirectional DC-DC voltage converter 120 to input electrical energy at its first terminal and output electrical energy at its second terminal. In this case, the AC-DC voltage converter 110 does not operate. The DC power output from the photovoltaic generator 160, after passing through the unidirectional DC-DC voltage converter 170, is output to the electrical equipment 30 to power its operation, and simultaneously output to the energy storage module 130 through the bidirectional DC-DC voltage converter 120 to charge the energy storage module 130.

[0080] In the third scenario, the output power of the photovoltaic generator 160 exceeds the rated power of the electrical equipment 30, and the remaining power is within the third power range, currently falling within the first time period. In this case, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate and controls the bidirectional DC-DC voltage converter 120 to input electrical energy at its first terminal and output electrical energy at its second terminal. In this situation, the AC-DC voltage converter 110 does not operate. The DC power output from the photovoltaic generator 160, after passing through the unidirectional DC-DC voltage converter 170, is output to the electrical equipment 30 to power its operation, and simultaneously output to the energy storage module 130 through the bidirectional DC-DC voltage converter 120 to charge the energy storage module 130.

[0081] In the fourth scenario, the output power of the photovoltaic generator 160 exceeds the rated power of the electrical equipment 30, the remaining power is within the third power range, and the current time is within the second time period. At this time, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate and controls the bidirectional DC-DC voltage converter 120 to input electrical energy at its first terminal and output electrical energy at its second terminal. In this case, the AC-DC voltage converter 110 does not operate. The DC power output from the photovoltaic generator 160, after passing through the unidirectional DC-DC voltage converter 170, is output to the electrical equipment 30 to power its operation, and also outputs to the energy storage module 130 through the bidirectional DC-DC voltage converter 120 to charge the energy storage module 130.

[0082] In the fifth scenario, the output power of the photovoltaic generator 160 exceeds the rated power of the electrical equipment 30, and the remaining power is within the second power range, currently falling within the first time period. In this case, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate. In this situation, the bidirectional DC-DC voltage converter 120 and the AC-DC voltage converter 110 do not operate. The DC power output from the photovoltaic generator 160 is then output to the electrical equipment 30 via the unidirectional DC-DC voltage converter 170, meaning the unidirectional DC-DC voltage converter 170 outputs electrical energy to the electrical equipment 30.

[0083] In the sixth scenario, the output power of the photovoltaic generator 160 exceeds the rated power of the electrical equipment 30, and the remaining power is within the second power range, currently falling within the second time period. In this case, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate. In this situation, the bidirectional DC-DC voltage converter 120 and the AC-DC voltage converter 110 do not operate. The DC power output from the photovoltaic generator 160 is then output to the electrical equipment 30 via the unidirectional DC-DC voltage converter 170, meaning the unidirectional DC-DC voltage converter 170 outputs electrical energy to the electrical equipment 30.

[0084] In the seventh scenario, the output power of the photovoltaic generator 160 is equal to the rated power of the electrical equipment 30, the remaining power is within the first power range, and the current time is within the first time period. At this time, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate. In this case, the bidirectional DC-DC voltage converter 120 and the AC-DC voltage converter 110 do not operate. The DC power output from the photovoltaic generator 160 is then output to the electrical equipment 30 via the unidirectional DC-DC voltage converter 170, meaning the unidirectional DC-DC voltage converter 170 outputs electrical energy to the electrical equipment 30.

[0085] In the eighth scenario, the output power of the photovoltaic generator 160 is equal to the rated power of the electrical device 30, the remaining power is within the first power range, and the current time is within the second time period. At this time, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate. In this case, the bidirectional DC-DC voltage converter 120 and the AC-DC voltage converter 110 do not operate. The DC power output from the photovoltaic generator 160 is then output to the electrical device 30 via the unidirectional DC-DC voltage converter 170, meaning the unidirectional DC-DC voltage converter 170 outputs electrical energy to the electrical device 30.

[0086] In the ninth scenario, the output power of the photovoltaic generator 160 is equal to the rated power of the electrical equipment 30, the remaining power is within the third power range, and the current time is within the first time period. At this time, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate. In this case, the bidirectional DC-DC voltage converter 120 and the AC-DC voltage converter 110 do not operate. The DC power output from the photovoltaic generator 160 is then output to the electrical equipment 30 via the unidirectional DC-DC voltage converter 170, meaning the unidirectional DC-DC voltage converter 170 outputs electrical energy to the electrical equipment 30.

[0087] In the tenth scenario, the output power of the photovoltaic generator 160 is equal to the rated power of the electrical equipment 30, the remaining power is within the third power range, and the current time is within the second time period. At this time, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate. In this case, the bidirectional DC-DC voltage converter 120 and the AC-DC voltage converter 110 do not operate. The DC power output from the photovoltaic generator 160 is then output to the electrical equipment 30 via the unidirectional DC-DC voltage converter 170, meaning the unidirectional DC-DC voltage converter 170 outputs electrical energy to the electrical equipment 30.

[0088] In the eleventh scenario, the output power of the photovoltaic generator 160 is equal to the rated power of the electrical equipment 30, the remaining power is within the second power range, and the current time is within the first time period. At this time, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate. In this case, the bidirectional DC-DC voltage converter 120 and the AC-DC voltage converter 110 do not operate. The DC power output from the photovoltaic generator 160 is then output to the electrical equipment 30 via the unidirectional DC-DC voltage converter 170, meaning the unidirectional DC-DC voltage converter 170 outputs electrical energy to the electrical equipment 30.

[0089] In the twelfth scenario, the output power of the photovoltaic generator 160 is equal to the rated power of the electrical device 30, the remaining power is within the second power range, and the current time is within the second time period. At this time, the controller 150 controls the unidirectional DC-DC voltage converter 170 to operate. In this case, the bidirectional DC-DC voltage converter 120 and the AC-DC voltage converter 110 do not operate. The DC power output from the photovoltaic generator 160 is then output to the electrical device 30 via the unidirectional DC-DC voltage converter 170, meaning the unidirectional DC-DC voltage converter 170 outputs electrical energy to the electrical device 30.

[0090] In the thirteenth scenario, the output power of the photovoltaic generator 160 is less than the rated power of the electrical equipment 30, and the remaining power is within the first power range, currently within the first time period. At this time, the controller 150 controls the AC / DC voltage converter 110 and the unidirectional DC voltage converter 170 to operate, and controls the bidirectional DC voltage converter 120 to input electrical energy at its first terminal and output electrical energy at its second terminal. In this case, the unidirectional DC voltage converter 170 obtains the electrical energy output from the photovoltaic generator 160, and the AC / DC voltage converter 110 obtains the AC power from the AC bus 20. The unidirectional DC voltage converter 170 and the AC / DC voltage converter 110 together output electrical energy to the electrical equipment 30, and output electrical energy to the energy storage module 130 through the bidirectional DC voltage converter 120.

[0091] In the fourteenth scenario, the output power of the photovoltaic generator 160 is less than the rated power of the electrical equipment 30, the remaining power is within the first power range, and the current time is within the second time period. At this time, the controller 150 controls the AC / DC voltage converter 110 and the unidirectional DC voltage converter 170 to operate. In this case, the bidirectional DC voltage converter 120 does not operate. The unidirectional DC voltage converter 170 obtains the electrical energy output from the photovoltaic generator 160, and the AC / DC voltage converter 110 obtains the AC power from the AC bus 20. The unidirectional DC voltage converter 170 and the AC / DC voltage converter 110 together output electrical energy to the electrical equipment 30.

[0092] In the fifteenth scenario, the output power of the photovoltaic generator 160 is less than the rated power of the electrical equipment 30, and the remaining power is within the third power range, currently within the first time period. At this time, the controller 150 controls the AC / DC voltage converter 110 and the unidirectional DC voltage converter 170 to operate, and controls the bidirectional DC voltage converter 120 to input electrical energy at its first terminal and output electrical energy at its second terminal. In this case, the unidirectional DC voltage converter 170 obtains the electrical energy output from the photovoltaic generator 160, and the AC / DC voltage converter 110 obtains the AC power from the AC bus 20. The unidirectional DC voltage converter 170 and the AC / DC voltage converter 110 together output electrical energy to the electrical equipment 30, and output electrical energy to the energy storage module 130 through the bidirectional DC voltage converter 120.

[0093] In the sixteenth scenario, the output power of the photovoltaic generator 160 is less than the rated power of the electrical equipment 30, the remaining power is within the third power range, and the current time is within the second time period. At this time, the controller 150 controls the unidirectional DC-DC converter 170 to operate and controls the bidirectional DC-DC converter 120 to input electrical energy at its second terminal and output electrical energy at its first terminal. In this case, the AC-DC converter 110 does not operate. The unidirectional DC-DC converter 170 obtains electrical energy output from the photovoltaic generator 160, and the bidirectional DC-DC converter 120 obtains electrical energy output from the energy storage module 130. Together, the unidirectional DC-DC converter 170 and the bidirectional DC-DC converter 120 output electrical energy to the electrical equipment 30.

[0094] In the seventeenth scenario, the output power of the photovoltaic generator 160 is less than the rated power of the electrical equipment 30, and the remaining power is within the second power range, currently falling within the first time period. In this case, the controller 150 controls the unidirectional DC-DC converter 170 to operate and controls the bidirectional DC-DC converter 120 to input electrical energy at its second terminal and output electrical energy at its first terminal. In this scenario, the AC-DC converter 110 does not operate. The unidirectional DC-DC converter 170 receives electrical energy from the photovoltaic generator 160, and the bidirectional DC-DC converter 120 receives electrical energy from the energy storage module 130. Together, the unidirectional DC-DC converter 170 and the bidirectional DC-DC converter 120 output electrical energy to the electrical equipment 30.

[0095] In the eighteenth scenario, the output power of the photovoltaic generator 160 is less than the rated power of the electrical equipment 30, and the remaining power is within the second power range, currently falling within the second time period. In this case, the controller 150 controls the unidirectional DC-DC converter 170 to operate and controls the bidirectional DC-DC converter 120 to input electrical energy at its second terminal and output electrical energy at its first terminal. In this scenario, the AC-DC converter 110 does not operate. The unidirectional DC-DC converter 170 receives electrical energy from the photovoltaic generator 160, and the bidirectional DC-DC converter 120 receives electrical energy from the energy storage module 130. Together, the unidirectional DC-DC converter 170 and the bidirectional DC-DC converter 120 output electrical energy to the electrical equipment 30.

[0096] In some embodiments, such as Figure 4 As shown, the DC power distribution system 10 also includes a photovoltaic monitor 180.

[0097] The photovoltaic (PV) monitor 180 is used to monitor the electrical energy output from the PV generator 160 to the energy storage module 130. This electrical energy includes quantity, current, and voltage. For example, the PV monitor 180 may include an electricity meter to count the quantity of electricity output from the PV generator 160 to the energy storage module 130; a voltmeter to detect the voltage output from the PV generator 160 to the energy storage module 130; and an ammeter to detect the current output from the PV generator 160 to the energy storage module 130. The PV monitor 180 has an input terminal and an output terminal. The input terminal of the PV monitor 180 is connected to the second terminal of the bidirectional DC-DC voltage converter 120, and the output terminal of the PV monitor 180 is connected to the energy storage module 130.

[0098] The controller 150 is connected to the photovoltaic monitor 180. The controller 150 is used to control the operation of the photovoltaic monitor 180 based on the remaining power of the energy storage module 130 and the output power of the photovoltaic generator 160.

[0099] Specifically, after acquiring the remaining power of the energy storage module 130 and the output power of the photovoltaic generator 160, if the remaining power is within a first or third power range, and the output power of the photovoltaic generator 160 is greater than the rated power of the electrical equipment 30, then the controller 150 controls the photovoltaic monitor 180 to operate, so that the bidirectional DC-DC converter 120 outputs electrical energy to the energy storage module 130 through the photovoltaic monitor 180. At this time, the photovoltaic monitor 180 can detect the amount, current, and voltage of the electrical energy output by the bidirectional DC-DC converter 120. That is to say, in the first, second, third, and fourth cases mentioned above, when the energy storage module 130 acquires only the electrical energy output by the photovoltaic generator 160, the controller 150 controls the photovoltaic monitor 180 to operate, thereby detecting the amount, current, and voltage of the electrical energy output by the bidirectional DC-DC converter 120 to the energy storage module 130. In other cases, the photovoltaic monitor 180 does not work. At this time, the photovoltaic monitor 180 is in a short-circuited state, and the energy storage module 130 can directly transmit power to the second terminal of the bidirectional DC-DC voltage converter 120.

[0100] In some embodiments, such as Figure 5 As shown, the DC bus 12 may include a positive bus 122 and a negative bus 124. The positive bus 122 and the negative bus 124 may have voltages with the same value but opposite polarities, thus giving the DC bus 12 a higher voltage. For example, the voltage of the positive bus 122 may be 375V, and the voltage of the negative bus 124 may be -375V, in which case the voltage of the DC bus 12 is 750V.

[0101] The DC power distribution system 10 may further include a DC combiner box 162. Specifically, the DC power distribution system 10 may include multiple photovoltaic generators 160 and multiple unidirectional DC-DC voltage converters 170. The output terminals of the multiple photovoltaic generators 160 and the input terminals of the multiple unidirectional DC-DC voltage converters 170 are connected one-to-one. The output terminals of the multiple unidirectional DC-DC voltage converters 170 are all connected to the DC bus 12 through the DC combiner box 162. The function of the DC combiner box 162 is to combine the electrical energy generated by the multiple photovoltaic generators 160. In some other embodiments, the DC combiner box 162 may also have a lightning protection function.

[0102] Electrical equipment 30 may include high-voltage DC electrical equipment 330 and low-voltage DC electrical equipment 320. High-voltage DC electrical equipment 330 may be, for example, a high-speed DC motor. The high voltage here may be 750V. Low-voltage DC electrical equipment 320 may be, for example, a lighting fixture. The low voltage here may be 48V. Generally, when electrical equipment 30 includes low-voltage DC electrical equipment 320, and the voltage of DC bus 12 is 750V, a distribution cabinet 310 may also be connected between DC bus 12 and low-voltage DC electrical equipment 320. The input terminal of distribution cabinet 310 is connected to DC bus 12, and the output terminal of distribution cabinet 310 is connected to low-voltage DC electrical equipment 320. Distribution cabinet 310 may include a Buck converter circuit.

[0103] In this embodiment, the DC power distribution system 10 includes an AC / DC voltage converter 110, a bidirectional DC voltage converter 120, an energy storage module 130, an energy storage manager 140, and a controller 150. The AC / DC voltage converter 110 is connected between the AC bus 20 and the first terminal of the bidirectional DC voltage converter 120. The first terminal of the bidirectional DC voltage converter 120 is also connected to the electrical device 30. The second terminal of the bidirectional DC voltage converter 120 is connected to the energy storage module 130. The detection terminal of the energy storage manager 140 is connected to the energy storage module 130 and is used to detect the remaining power of the energy storage module 130 and output the remaining power to the controller 150. The controller 150 is used to control the operation of the AC / DC voltage converter 110 and the bidirectional DC voltage converter 120. When the DC power distribution system 10 is operating: if the remaining power of the energy storage module 130 is within a first power range where the power is relatively low, the controller 150 controls the AC-DC voltage converter 110 and the bidirectional DC voltage converter 120 to operate, so that the AC-DC voltage converter 110 obtains electrical energy from the AC bus 20 and outputs electrical energy to the electrical device 30, and charges the energy storage module 130 through the bidirectional DC voltage converter 120; if the remaining power of the energy storage module 130 is within a second power range where the power is relatively high, the controller 150 controls the bidirectional DC voltage converter 120 to operate, so that the energy storage module 130 outputs electrical energy to the electrical device 30 through the bidirectional DC voltage converter 120. When the remaining power of the energy storage module 130 is relatively high, the DC power distribution system 10 can output DC power from the energy storage module 130 to the electrical device 30, thereby providing electrical energy to the electrical device 30. This reduces the time that electrical equipment 30 is powered by AC bus 20, thereby mitigating various problems caused by the AC power distribution system supplying power to electrical equipment 30 and improving power quality. Simultaneously, reducing AC power usage reduces the need for tertiary distribution boxes and cables in the AC power distribution system, thus improving the convenience of construction workers and the safety of the construction site.

[0104] The energy storage module 130 may include a first energy storage unit 132 and a second energy storage unit 134. The first energy storage unit 132 and the second energy storage unit 134 are connected in parallel and located within the battery swapping cabinet 14. The first energy storage unit 132 is fixedly connected to the battery swapping cabinet 14, while the second energy storage unit 134 is detachably connected to the battery swapping cabinet 14. Thus, the second energy storage unit 134 can be removed from the battery swapping cabinet 14 to power other electrical devices 30 that are not connected to the first terminal of the bidirectional DC-DC voltage converter 120. Since the first energy storage unit 132 and the second energy storage unit 134 are connected in parallel, removing the second energy storage unit 134 will not affect the output voltage of the energy storage module 130, thereby improving the flexibility of the DC power distribution system 10. In this embodiment, a photovoltaic generator 160 is also used to power the energy storage module 130 and the electrical devices 30, which is environmentally friendly. When the controller 150 is operating, it incorporates the determination of the current time period and stores electrical energy through the energy storage module 130. This reduces the resources required to obtain power from the AC bus 20, achieving peak shaving and valley filling of power consumption. The energy storage module 130 may also include a supercapacitor to maintain the voltage stability of the DC bus 12.

[0105] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A DC power distribution system, characterized in that, include: AC / DC voltage converters, bidirectional DC voltage converters, energy storage modules, energy storage managers, and controllers; The input terminal of the AC / DC voltage converter is used to connect to the AC bus, and the output terminal of the AC / DC voltage converter is connected to the first terminal of the bidirectional DC voltage converter. The first end of the bidirectional DC voltage converter is also used to connect to electrical equipment, and the second end of the bidirectional DC voltage converter is connected to the energy storage module. The detection terminal of the energy storage manager is connected to the energy storage module to detect the remaining power of the energy storage module, and the output terminal of the energy storage manager is connected to the controller to output the detection result of the remaining power to the controller. The controller is also connected to the control terminal of the AC / DC voltage converter and the control terminal of the bidirectional DC voltage converter. The controller is configured to: if the remaining power is within a first power range, control the AC / DC voltage converter and the bidirectional DC voltage converter to operate, so that the AC / DC voltage converter outputs power to the electrical device and outputs power to the energy storage module through the bidirectional DC voltage converter; if the remaining power is within a second power range, control the bidirectional DC voltage converter to operate, so that the energy storage module outputs power to the electrical device through the bidirectional DC voltage converter. The maximum value of the first power range is less than the minimum value of the second power range; The DC power distribution system further includes: a photovoltaic generator and a unidirectional DC voltage converter; The output terminal of the photovoltaic generator is connected to the input terminal of the unidirectional DC voltage converter, and the output terminal of the unidirectional DC voltage converter is connected to the first terminal of the bidirectional DC voltage converter and the electrical equipment. The controller is also connected to the output terminal of the photovoltaic generator to detect the output power of the photovoltaic generator. The controller is configured to: if the remaining power is within the first power range and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, control the AC-DC voltage converter, the bidirectional DC voltage converter and the unidirectional DC voltage converter to operate so that the AC-DC voltage converter and the unidirectional DC voltage converter output electrical energy to the electrical equipment, and output electrical energy to the energy storage module through the bidirectional DC voltage converter.

2. The DC power distribution system as described in claim 1, characterized in that, The DC power distribution system further includes: a battery swapping cabinet, wherein the bidirectional DC voltage converter, the energy storage manager, and the energy storage module are all located within the battery swapping cabinet; The energy storage module includes a first energy storage unit and a second energy storage unit connected in parallel. The first energy storage unit is fixedly connected to the battery swapping cabinet, and the second energy storage unit is detachably connected to the battery swapping cabinet.

3. The DC power distribution system as described in claim 1, characterized in that, The controller is configured to: if the current time is within a first time period, the remaining power is within the first power range, and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, then control the AC / DC voltage converter, the bidirectional DC voltage converter, and the unidirectional DC voltage converter to operate, so that the AC / DC voltage converter and the unidirectional DC voltage converter output electrical energy to the electrical equipment, and output electrical energy to the energy storage module through the bidirectional DC voltage converter.

4. The DC power distribution system as described in claim 1, characterized in that, The controller is further configured to: if the remaining power is within a third power range and the output power of the photovoltaic generator is equal to the rated power of the electrical equipment, then control the unidirectional DC voltage converter to operate so that the unidirectional DC voltage converter outputs electrical energy to the electrical equipment; the minimum value of the third power range is greater than the maximum value of the first power range, and the maximum value of the third power range is greater than the minimum value of the second power range.

5. The DC power distribution system as described in claim 1, characterized in that, The controller is further configured to: if the remaining power is within a third power range and the output power of the photovoltaic generator is greater than the rated power of the electrical equipment, control the unidirectional DC-DC converter and the bidirectional DC-DC converter to operate, so that the unidirectional DC-DC converter outputs electrical energy to the electrical equipment and outputs electrical energy to the energy storage module through the bidirectional DC-DC converter; the minimum value of the third power range is greater than the maximum value of the first power range, and the maximum value of the third power range is greater than the minimum value of the second power range.

6. The DC power distribution system as described in claim 5, characterized in that, The DC power distribution system also includes: a photovoltaic monitor; The input terminal of the photovoltaic monitor is connected to the second terminal of the bidirectional DC-DC voltage converter, and the output terminal of the photovoltaic monitor is connected to the energy storage module. The controller is also connected to the photovoltaic monitor, and the controller is further configured to: if the remaining power is within the third power range and the output power of the photovoltaic generator is greater than the rated power of the electrical equipment, then control the photovoltaic monitor to operate so that the bidirectional DC voltage converter outputs electrical energy to the energy storage module through the photovoltaic monitor; When the photovoltaic monitor is working, it detects the amount of electricity, current and voltage output by the bidirectional DC voltage converter; the minimum value of the third electricity range is greater than the maximum value of the first electricity range, and the maximum value of the third electricity range is greater than the minimum value of the second electricity range.

7. The DC power distribution system as described in claim 1, characterized in that, The controller is further configured to: if the remaining power is within the second power range and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, control the unidirectional DC voltage converter and the bidirectional DC voltage converter to operate so that both the unidirectional DC voltage converter and the bidirectional DC voltage converter output electrical energy to the electrical equipment.

8. The DC power distribution system as described in claim 1, characterized in that, The controller is further configured to: if the current time is within a first time period, the remaining power is within a third power range, and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, then control the AC / DC voltage converter, the unidirectional DC voltage converter, and the bidirectional DC voltage converter to operate, so that the AC / DC voltage converter and the unidirectional DC voltage converter output electrical energy to the electrical equipment, and output electrical energy to the energy storage module through the bidirectional DC voltage converter; the minimum value of the third power range is greater than the maximum value of the first power range, and the maximum value of the third power range is greater than the minimum value of the second power range.

9. The DC power distribution system as described in claim 8, characterized in that, The controller is further configured to: if the current time is within a second time period, the remaining power is within the third power range, and the output power of the photovoltaic generator is less than the rated power of the electrical equipment, then control the unidirectional DC voltage converter and the bidirectional DC voltage converter to operate so that both the unidirectional DC voltage converter and the bidirectional DC voltage converter output electrical energy to the electrical equipment.

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