Distributed photovoltaic electric energy management system

Abstract

A distributed photovoltaic electric energy management system disclosed by the present invention comprises a cabinet body assembly, a modular mounting rack and a functional module unit, the side wall of the cabinet body assembly adopts an outer cooling air duct formed by an outer layer plate and an inner layer plate, the inner layer plate encloses to form a mounting cavity, an inner circulation air duct is arranged in the mounting cavity, and the modular mounting rack is arranged in the inner circulation air duct. The modular mounting frame is vertically arranged in the mounting cavity, and the functional module units are slidably mounted on the modular mounting frame in the horizontal direction, so that the problems that heat dissipation and protection of existing equipment are difficult to consider at the same time, and a physical safety barrier is lacked under an extreme fault are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic power energy management, and in particular to a distributed photovoltaic power energy management system. BACKGROUND

[0002] With the promotion of the national "double carbon" strategy, the penetration rate of distributed photovoltaics in the distribution network is increasing. Energy management system (EMS) and its supporting hardware devices are the key physical carriers to realize efficient consumption and scheduling of photovoltaic power. However, in actual power grid operation and maintenance work, the existing outdoor photovoltaic grid-connected box or management cabinet has significant mechanical structure defects: 1. The contradiction between heat dissipation and protection. If the outdoor cabinet body adopts a fully enclosed air conditioner or heat exchange cooling, the protection level is high but the energy consumption is large, and the cooling capacity is easy to encounter a bottleneck in extremely high temperature weather. If straight-through air cooling is used, it cools quickly but cannot isolate sand, willow dust and salt mist, which can easily cause internal circuit board short circuit or corrosion.

[0003] 2. Lack of physical failure protection. The existing intelligent temperature control system simply relies on electronic sensors and controllers. When the controller is dead due to lightning surge, or the auxiliary power supply is interrupted, the electric control air door may be stuck in the closed state. At this time, if the photovoltaic is still generating power, the heat generated by the high-power inverter module in the cabinet cannot be dissipated, and the temperature will quickly get out of control, which can easily cause equipment burning or even fire accidents.

[0004] Therefore, we provide a distributed photovoltaic power energy management system to solve the above problems. SUMMARY

[0005] In view of the problems existing in the prior art, the present application provides a distributed photovoltaic power energy management system, which solves the problems of existing equipment that cannot simultaneously consider heat dissipation and protection, and lack of physical safety barrier under extreme failure In order to achieve the above purpose, the distributed photovoltaic power energy management system adopted by the present application comprises a cabinet body assembly, a modular mounting rack and a functional module unit. The side wall of the cabinet body assembly adopts an outer cooling air duct formed by an outer layer plate and an inner layer plate. The inner layer plate encloses to form a mounting cavity. An inner circulation air duct is arranged in the mounting cavity. The modular mounting rack is vertically arranged in the mounting cavity. One functional module unit is slidably mounted on the modular mounting rack in the horizontal direction.

[0006] As a further optimization of the above scheme, it further comprises a blind plug connection mechanism, which comprises a floating male head arranged at the rear end of the functional module unit and a fixed female seat arranged on the back plate of the mounting cavity.

[0007] As a further optimization of the above scheme, the floating male head is provided with elastic guide pins around.

[0008] As a further optimization of the above solution, the fixed female base is a heat dissipation base.

[0009] As a further optimization of the above solution, the bottom of the cabinet assembly is provided with a shock-absorbing base, which includes an upper bearing plate, a lower base plate, and a wire rope shock absorber disposed between the upper bearing plate and the lower base plate.

[0010] As a further optimization of the above solution, the inner wall of the external cooling duct is provided with at least two electric-motor hybrid drive damper mechanisms for controlling the airflow connection and isolation between the mounting cavity and the external cooling duct.

[0011] As a further optimization of the above solution, the electric-motor hybrid drive damper mechanism includes an electric actuator and a ventilation door panel. The ventilation door panel is installed at the ventilation openings at the upper and lower ends of the inner wall of the cabinet assembly, and the ventilation door panel rotates around the horizontal axis to open or close the ventilation openings. The tail end of the electric actuator is hinged to the fixed bracket of the inner wall panel, and the telescopic rod of the electric actuator is hinged to the lower end of the ventilation door panel.

[0012] As a further optimization of the above solution, the electric-motor hybrid drive damper mechanism also includes a temperature-sensitive mechanical forced-opening unit that opens the vent when heated and expanded.

[0013] As a further optimization of the above solution, the temperature-sensing mechanical forced start unit includes a paraffin thermal actuator and a mechanical overrunning link. The temperature sensing probe of the paraffin thermal actuator is placed inside the mounting cavity. One end of the mechanical overrunning link is hinged to the bottom of the ventilation door panel, and the other end of the mechanical overrunning link is hinged to a fixed bracket. The mechanical overrunning link has an elongated hole. One end of the paraffin thermal actuator is hinged to the fixed bracket, and the other end is connected to the elongated hole through a connecting pin.

[0014] The distributed photovoltaic power management system of the present invention has the following beneficial effects: The distributed photovoltaic power management system of the present invention introduces an electromechanical hybrid drive damper mechanism. On the basis of conventional electrical control thermal management, a paraffin thermal actuator based on the physical phase change characteristics of materials is added as a passive safety backup. When extreme high-end conditions caused by the failure of the control system software and hardware or the interruption of auxiliary power supply occur earlier, this mechanism can realize mechanical override action that is completely independent of electrical control and forcibly open the heat dissipation channel. By adopting this physical-level failure safety protection mechanism, the risk of equipment damage caused by thermal runaway in unattended scenarios is significantly reduced, thus ensuring the safety of core grid assets. The distributed photovoltaic power management system of the present invention is based on an external cooling duct formed by a double-wall structure. It has two operating modes: isolation heat exchange and direct air cooling. Under normal conditions, closed-loop isolation heat dissipation is preferred to effectively isolate external pollutants such as wind, sand and salt spray, and improve the operational stability of internal precision components in harsh environments. Under high-temperature conditions, it can quickly switch to ventilation mode to break through the heat dissipation bottleneck and significantly improve the device's adaptability to variable outdoor climate environments. The distributed photovoltaic power management system of the present invention features a modular unit structure with a radial blind-plug connection mechanism, which enables rapid hot-swapping and reliable electrical connection of functional modules, eliminating the need for cumbersome on-site wiring and effectively shortening the mean time to repair faults.

[0015] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope as a result, and the embodiments of the present invention include many changes, modifications and equivalents. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a distributed photovoltaic power management system. Figure 2 This is a schematic diagram of the blind mating connection mechanism in this invention; Figure 3 This is a schematic diagram of the external cooling air duct structure in this invention; Figure 4 This is a schematic diagram of the electro-mechanical hybrid drive damper mechanism in this invention; Figure 5 This is a schematic diagram of the opening and closing process of the ventilation door panel in this invention; Figure 6 This is a schematic diagram of the fan-shaped ratchet plate in this invention; Figure 7 This is a schematic diagram of the ratchet drive mechanism in this invention; Figure 8 This is a schematic diagram of the drive unit in this invention.

[0017] In the diagram: 1. Cabinet assembly; 11. Outer panel; 12. Inner panel; 2. Modular mounting bracket; 3. Functional module unit; 4. External cooling air duct; 5. Mounting cavity; 6. Internal circulation air duct; 7. Blind plug connection mechanism; 71. Floating male connector; 72. Fixed female connector; 8. Vibration damping base; 81. Upper load-bearing plate; 82. Lower base plate; 83. Wire rope vibration damper; 9. Electric-motor hybrid drive damper mechanism; 91. Electric actuator unit; 92. Ventilation door panel; 93. Ventilation opening; 94. Temperature-sensing mechanical forced start unit; 941 942. Paraffin thermal actuator; 943. Mechanical overrunning linkage; 944. Temperature sensor; 945. Long slotted hole; 96. Fan-shaped ratchet plate; 97. One-way sawtooth; 98. Rocker arm type thrust pawl; 996. Clamping tooth; 90. Fixed bracket; 91. Racket drive mechanism; 92. First drive linkage; 93. Second drive linkage; 94. Return spring; 95. Drive telescopic rod; 96. Drive unit; 97. Thermal capacity encapsulation box; 98. SMA shape memory alloy spring; 98. Thermally conductive damping grease. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0019] It should be noted that when an element is referred to as "set on" or "provided with" another element, it can be directly on the other element or there may be an intermediate element. When an element is referred to as "connected to" or "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. "Fixed connection" means fixed connection. There are many ways of fixed connection, which are not within the scope of protection of this document. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in the specification herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Please refer to the instruction manual appendix. Figures 1-3This invention provides a first embodiment of a distributed photovoltaic power energy management system. In this embodiment, the system includes a cabinet component 1, which is a vertical cuboid structure. An inner lining plate is used to enclose a sealed installation cavity 5. A modular mounting frame 2 is vertically welded inside the installation cavity 5. Multiple sets of horizontal slide rail components are symmetrically arranged on the inner walls of the left and right sides of the modular mounting frame 2. The side walls of the functional module unit 3 are provided with slide bars that cooperate with the slide rail components, so that it is horizontally slidably installed in the modular mounting frame 2 in a drawer-like manner.

[0021] In some embodiments, functional module unit 3 includes a photovoltaic inverter module, an energy storage control module, etc.

[0022] In some embodiments, the outer shell of the functional module unit 3 is made of electromagnetic shielding material, and the modular mounting bracket 2 is provided with conductive springs to achieve equipotential connection between the functional module unit 3 and the cabinet assembly 1.

[0023] Specifically, on the modular mounting bracket 2, a blind insertion connection mechanism 7 is designed for each modular level. The blind insertion connection mechanism 7 includes a fixing female seat 72 that is fixed to the modular mounting bracket 2 by bolts. The modular mounting bracket is preferably made of aluminum alloy and has heat dissipation fins. The base of the fixing female seat 72 is directly attached to and locked onto the modular mounting bracket.

[0024] The floating male connector 71 is not rigidly fixed, but is installed by elastic washers or spring screws, so that the floating male connector 71 has a radial floating displacement. Furthermore, in some embodiments, conical elastic guide pins can also be installed around the floating male connector 71. The fixed female connector 72 is a heat dissipation base.

[0025] When the functional module unit 3 is pushed in along the slide rail assembly, the guide pin first inserts into the guide hole of the fixed female seat 72 to fine-tune the positive position error; as it continues to be pushed in, the male head and the copper busbar terminal in the female seat precisely engage to achieve circuit conduction.

[0026] Please refer to the instruction manual appendix. Figures 3-5 The present invention provides a second embodiment of a distributed photovoltaic power energy management system. Based on the structure of the first embodiment, this embodiment also includes a thermal management system. Specifically, the side wall of the cabinet component 1 adopts a hollow structure with double-layer sheet metal welding. An external cooling air duct 4 is formed between the outer layer plate 11 and the inner layer plate 12. The space enclosed by the inner layer plate 12 is the installation cavity 5. An internal circulation air duct 6 is also provided in the installation cavity 5.

[0027] In some embodiments, the internal circulation duct 6 may have a built-in fan or an additional fan driven by it.

[0028] In more detail, the electric-motor hybrid drive damper mechanism 9 is located at the vents 93 at the upper and lower ends of the inner wall panel of the cabinet assembly 1. The electric-motor hybrid drive damper mechanism 9 includes a ventilation door panel 92 hinged at the vent 93, which can rotate about a horizontal axis to open or close the vent 93.

[0029] Furthermore, the electric-motor hybrid drive damper mechanism 9 also includes an electric actuator 91. The tail end of the electric actuator 91 is hinged to the fixed bracket of the inner wall panel, and the front end of the electric actuator 91 is hinged to the lower part of the ventilation door panel 92. During normal operation, the electric actuator 91 directly drives the door panel to open and close.

[0030] Specifically, in some embodiments, the electric actuator 91 may be a linear electric actuator.

[0031] Furthermore, the electric-motor hybrid drive damper mechanism 9 also includes a temperature-sensitive mechanical forced-opening unit 94 that opens the ventilation port 93 upon thermal expansion.

[0032] Furthermore, the temperature-sensitive mechanical start unit 94 includes a paraffin thermal actuator 941 and a mechanical overrunning link 942. The temperature-sensing probe 943 of the paraffin thermal actuator 941 is located inside the mounting cavity 5. One end of the mechanical overrunning link 942 is hinged to the bottom of the ventilation door panel 92, and the other end of the mechanical overrunning link 942 is hinged to a fixed bracket. The mechanical overrunning link 942 has an elongated hole 944. One end of the paraffin thermal actuator 941 is hinged to the fixed bracket, and the other end is connected to the elongated hole 944 through a connecting pin.

[0033] In this embodiment, the working process of the electric-motor hybrid drive damper mechanism 9 is as follows: Normal state: When the cavity temperature is normal, the paraffin wax contracts, and the connecting rod of the paraffin wax thermal actuator 941 is in the retracted position. At this time, the drive pin on the ventilation door panel 92 is located within the free travel section of the elongated hole 944. When the electric actuator 91 drives the door panel to move, the connecting rod of the paraffin wax thermal actuator 941 moves freely within the elongated hole 944.

[0034] Oversight state: When the cavity temperature rises abnormally, the paraffin undergoes a solid-liquid phase change and expands in volume, pushing the push rod inside the paraffin thermal actuator 941 to extend. The push rod inside the paraffin thermal actuator 941 slides along the elongated slot 944, driving the mechanical override linkage 942 to swing, and forcibly pushing the ventilation door 92 to rotate outward and open. At this time, regardless of the state of the electric push rod, the ventilation door 92 will be physically pushed open, opening up the internal and external air ducts.

[0035] Furthermore, in some embodiments, the electric-motor hybrid drive damper mechanism 9 is further improved. In this embodiment, a fan-shaped ratchet plate 95 is installed on the inner surface of the ventilation door plate 92, and the front end of the rocker-arm thrust pawl 96 is provided with a locking tooth 961 that matches the fan-shaped ratchet plate 95. The side of the fan-shaped ratchet plate 95 is provided with a fixed bracket 97 fixed on the inner wall of the mounting cavity 5. The end of the rocker-arm thrust pawl 96 away from the locking tooth 961 is hinged to the fixed bracket 97 by a pin, so that the rocker-arm thrust pawl 96 can swing around the pin. The front part of the rocker-arm thrust pawl 96 is connected to a ratchet drive mechanism 98 that can control the locking tooth 961 to disengage from the fan-shaped ratchet plate 95.

[0036] More specifically, in this embodiment, the fan-shaped ratchet plate 95 is an arc-shaped stainless steel plate. The base of the fan-shaped ratchet plate 95 is rigidly fixed to the side frame of the ventilation door panel 92 by means of screws or other means, so that the fan-shaped ratchet plate 95 rotates with the ventilation door panel 92. Several unidirectional serrations 951 are processed on the outer arc surface of the fan-shaped ratchet plate 95.

[0037] Furthermore, the tilt direction of the one-way sawtooth 951 is designed such that after the locking tooth 961 contacts the fan-shaped ratchet plate 95, it allows the ventilation door plate 92 to slide outward in the opening direction, preventing the ventilation door plate 92 from retracting in the closing direction.

[0038] In some embodiments, the ratchet drive mechanism 98 includes a first drive link 981 connected to both sides of the front portion of the rocker arm type thrust pawl 96. A second drive link 982 is rotatably connected to the outer side of the end of the first drive link 981 facing away from the rocker arm type thrust pawl 96. A restoring spring 983 is connected to the inner side of the end of the two first drive links 981 facing away from the rocker arm type thrust pawl 96. The other end of the second drive link 982 is rotatably connected to the drive telescopic rod 984. The drive end of the drive telescopic rod 984 is provided with a drive unit 985.

[0039] More specifically, in some embodiments, the drive unit 985 is a drive cylinder, and the drive telescopic rod 984 is connected to the drive cylinder.

[0040] More specifically, in some embodiments, the drive unit 985 includes a thermally conductive encapsulated box 9851, which is a thick-walled square shell made of brass. The interior of the thermally conductive encapsulated box 9851 is filled with thermally conductive damping grease. The thermally conductive encapsulated box 9851 is fixed on the fixed bracket 97. The SMA memory alloy spring 9852 is immersed in the thermally conductive damping grease 9853 inside the thermally conductive encapsulated box. One end of the SMA memory alloy spring 9852 is fixed to the bottom of the box, and the other end is connected to the drive telescopic rod 984.

[0041] When the SMA memory alloy spring contracts due to heat, the resulting tension is greater than the tension required to unlock the SMA memory alloy spring 9852. At this time, the rocker-arm type thrust pawl 96 is pulled and overcomes the spring force, and the front end tooth 961 of the rocker-arm type thrust pawl 96 is forcibly pressed into the fan-shaped ratchet plate 951.

[0042] Furthermore, in this embodiment, the bottom of the cabinet assembly 1 is provided with a shock-absorbing base 8, which includes an upper bearing plate 81, a lower base plate 82, and a wire rope shock absorber 83 disposed between the two.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A distributed photovoltaic power management system, characterized in that: The cabinet assembly (1), the modular mounting frame (2), and the functional module units (3) are included. The side wall of the cabinet assembly (1) is formed by an outer cooling air duct (4) by an outer layer plate (11) and an inner layer plate (12). The inner layer plate (12) surrounds and forms an installation cavity (5). An internal circulation air duct (6) is provided in the installation cavity (5). The modular mounting frame (2) is vertically set in the installation cavity (5). Multiple functional module units (3) are slidably installed on the modular mounting frame (2) in the horizontal direction.

2. The distributed photovoltaic power management system according to claim 1, characterized in that: It also includes a blind-fit connection mechanism (7), which includes a floating male connector (71) disposed at the rear end of the functional module unit (3) and a fixed female connector (72) disposed on the back plate of the mounting cavity (5).

3. The distributed photovoltaic power management system according to claim 2, characterized in that: The floating male head (71) is provided with elastic guide pins around its perimeter.

4. The distributed photovoltaic power management system according to claim 3, characterized in that: The fixed female base (72) is a heat dissipation base.

5. The distributed photovoltaic power management system according to claim 4, characterized in that: The bottom of the cabinet assembly (1) is provided with a shock-absorbing base (8), which includes an upper bearing plate (81), a lower base plate (82), and a wire rope shock absorber (83) disposed between the upper bearing plate (81) and the lower base plate (82).

6. The distributed photovoltaic power management system according to claim 1, characterized in that: The inner wall of the external cooling duct (4) is provided with at least two electric-motor hybrid drive damper mechanisms (9) for controlling the airflow communication and isolation between the installation cavity (5) and the external cooling duct (4).

7. The distributed photovoltaic power management system according to claim 6, characterized in that: The electric-motor hybrid drive damper mechanism (9) includes an electric actuator (91) and a ventilation door (92). The ventilation door (92) is installed at the ventilation openings (93) at the upper and lower ends of the inner wall of the cabinet assembly (1). The ventilation door (92) rotates around the horizontal axis to open or close the ventilation openings (93). The tail end of the electric actuator (91) is hinged to the fixed bracket of the inner wall panel. The telescopic rod of the electric actuator (91) is hinged to the lower end of the ventilation door (92).

8. The distributed photovoltaic power management system according to claim 7, characterized in that: The electric-motor hybrid drive damper mechanism (9) also includes a temperature-sensitive mechanical forced start unit (94) that opens the vent (93) when heated and expanded.

9. The distributed photovoltaic power management system according to claim 8, characterized in that: The temperature-sensitive mechanical start unit (94) includes a paraffin thermal actuator (941) and a mechanical overrunning link (942). The temperature-sensing probe (943) of the paraffin thermal actuator (941) is located inside the mounting cavity (5). One end of the mechanical overrunning link (942) is hinged to the bottom of the ventilation door panel (92), and the other end of the mechanical overrunning link (942) is hinged to the fixed bracket. The mechanical overrunning link (942) has an elongated hole (944). One end of the paraffin thermal actuator (941) is hinged to the fixed bracket, and the other end is connected to the elongated hole (944) through a connecting pin.

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