Grid-connected and off-grid switching device of grid-forming type energy storage inverter

Abstract

The utility model discloses a grid-connected and off-grid switching device for a grid-forming type energy storage inverter. The grid-connected and off-grid switching device comprises a wiring ring, an inverter connecting ring, an adjusting ring and an adjusting knob, the inverter connecting ring is sleeved in the wiring ring, and the inverter connecting ring and the wiring ring can rotate relatively; the adjusting ring is arranged in the inverter connecting ring in a sleeved mode, and the adjusting ring and the inverter connecting ring can rotate relatively. The adjusting knob is fixedly arranged on the adjusting ring; two grooves are formed in the inner ring face of the wiring ring, and a grid-connected wiring terminal and an off-grid wiring terminal are arranged in the two grooves respectively. The inverter connecting ring is provided with a through hole, the through hole is arranged along the radial direction of the inverter connecting ring, the through hole is internally provided with an inverter binding post in a penetrating manner, the switching device can realize rapid switching between grid connection and grid disconnection, the sealing performance of the switching device is relatively good, and the switching device is convenient to use. The influence of dust and rainwater on the use stability of the switching device can be reduced in a complex use environment.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, specifically to a grid-connected and off-grid switching device for a grid-connected energy storage inverter. Background Technology

[0002] An energy storage inverter is a device that converts direct current (DC) to alternating current (AC) and supplies it to the power grid or load. Its main functions include: 1. Energy storage and discharge control: The inverter can control the charging and discharging of batteries, adjusting the charging and discharging rate and time as needed. 2. Grid-connected and off-grid switching: When the grid is normal, the inverter can supply power from solar panels to the grid; when the grid fails, it can switch to off-grid mode to continue supplying power to the load. 3. Reverse charging protection: The inverter has reverse charging protection to prevent damage from overcharging of the battery. 4. Optimized energy management: The inverter optimizes the management of battery power, maximizing energy utilization and management. It can also adjust the charging and discharging rate and time as needed to achieve optimal energy utilization and management.

[0003] The grid-connected and off-grid switching function of energy storage inverters is mainly manifested as follows: when the grid is normal, the photovoltaic energy storage inverter operates in grid-connected mode; when the grid is abnormal, it automatically switches to off-grid mode; and after the grid is restored, it switches back to grid-connected mode. Existing technologies describe some devices capable of grid-connected and off-grid switching, such as those described in references 1 and 2.

[0004] Reference 1: Chinese patent document with publication number CN218333524U

[0005] Reference 1 describes a grid-connected and off-grid switching device for an energy storage inverter, belonging to the field of inverter switching technology. It includes a switcher body and a relay protector connected to the switcher body. The switcher body consists of a grounding wire base, the switcher itself, and a rotary controller. The switcher includes a housing and a control core. The housing consists of a wiring housing and a maintenance housing. The wiring housing is evenly divided into multiple wiring units, each including grid-connected and off-grid terminals. Two symmetrically arranged metal terminal slots are provided within the wiring housing, connecting to the grid-connected and off-grid terminals respectively. This switcher provides a relay connection between the energy storage inverter and the relay protectors on both grid-connected and off-grid lines. During line switching, it achieves rapid line switching, and synchronous switching ensures circuit stability.

[0006] Reference 2: Chinese patent document with publication number CN220692840U

[0007] Reference 2 describes a grid-connected / off-grid switching device for a photovoltaic inverter, including a terminal block with multiple grid-connected and off-grid terminals arranged opposite each other. The terminal block is also rotatably connected to a control body, which has multiple photovoltaic inverter connection lines corresponding to the grid-connected or off-grid terminals. Each photovoltaic inverter connection line connects to two contact plates simultaneously, and the two contact plates are used to contact either the grid-connected or off-grid terminal respectively. The control body is rotatable, and the contact plates cannot simultaneously contact either the grid-connected or off-grid terminal. Unlike existing structures, this device can simultaneously connect and disconnect multiple terminals synchronously, and each contact plate is only used for grid-connected or off-grid connection. By using two sets of contact plates to switch between grid-connected and off-grid states, and because the two sets of contact plates are not adjacent or in contact, mutual interference can be avoided.

[0008] References 1 and 2 both describe methods for switching inverters between grid and off-grid. However, the technical methods for achieving grid-connected and off-grid switching of inverters are not limited to the two mentioned above. Based on this, the applicant proposes a grid-connected and off-grid switching device that differs from existing technologies. Utility Model Content

[0009] The purpose of this invention is to provide a grid-connected and off-grid switching device with a technical approach different from existing technologies, which can achieve the effect of rapid line switching.

[0010] To address the shortcomings of the aforementioned technical problems, the present invention adopts the following technical solution: a grid-connected and off-grid switching device for a grid-connected energy storage inverter, comprising a wiring ring, an inverter connection ring, an adjustment ring, and an adjustment knob;

[0011] The inverter connecting ring is sleeved inside the wiring ring, and the inverter connecting ring and the wiring ring can rotate relative to each other;

[0012] The adjusting ring is sleeved inside the inverter connecting ring, and the adjusting ring and the inverter connecting ring can rotate relative to each other;

[0013] The adjustment knob is fixedly mounted on the adjustment ring, and the adjustment knob is coaxially arranged with the adjustment ring.

[0014] The inner ring surface of the connector ring has two grooves, and the grid-connected terminal and the off-grid terminal are respectively provided in the two grooves;

[0015] An inverter connection ring has a through hole arranged radially along the inverter connection ring. An inverter terminal is inserted through the through hole. A reset spring is fitted over the inverter terminal. The upper end of the reset spring is fixedly connected to the inner wall of the through hole, and the lower end of the reset spring is fixedly connected to the inverter terminal.

[0016] The outer circle of the adjustment ring is provided with a notch. When the lower end of the inverter terminal contacts the bottom of the notch, the upper end of the inverter terminal is located in the through hole. When the lower end of the inverter terminal contacts the outer wall of the outer circle of the adjustment ring (excluding the notch), the upper end of the inverter terminal extends out of the through hole and contacts the grid-connected terminal / off-grid terminal.

[0017] The adjustment knob has a notch, and an arc-shaped through hole is provided on the adjustment ring corresponding to the notch position. A stop post is inserted through the arc-shaped through hole. The stop post has a U-shaped structure, with its vertical part inserted inside the through hole and its two horizontal parts fixedly connected to the upper and lower end faces of the inverter connection ring, respectively.

[0018] As a further optimization of the grid-connected and off-grid switching device for a grid-type energy storage inverter of this utility model: the openings of the two grooves of the wiring ring are arranged opposite to each other.

[0019] As a further optimization of the grid-connected and off-grid switching device for the grid-type energy storage inverter of this utility model: the lower end of the inverter terminal is hemispherical.

[0020] As a further optimization of the grid-connected and off-grid switching device for the grid-type energy storage inverter of this utility model: the outer surface of the wiring ring and the inverter connection ring is provided with marking lines.

[0021] As a further optimization of the grid-connected and off-grid switching device for a grid-type energy storage inverter of this utility model: at least two grid-connected terminals and at least two off-grid terminals are provided, and multiple grid-connected terminals and multiple off-grid terminals are evenly distributed along the length direction of the connection ring. The number of inverter terminals is the same as the number of grid-connected terminals / off-grid terminals, and multiple inverter terminals are evenly distributed along the length direction of the inverter connection ring.

[0022] As a further optimization of the grid-connected and off-grid switching device of the grid-type energy storage inverter of this utility model: the adjustment knob is a disc-shaped structure, and the two end faces of its notch are at a 90° angle.

[0023] As a further optimization of the grid-connected and off-grid switching device for the grid-type energy storage inverter of this utility model: the adjustment knob is connected to the stepper motor drive.

[0024] As a further optimization of the grid-connected and off-grid switching device for the grid-type energy storage inverter of this utility model: the concave sidewall of the regulating ring is an arc surface.

[0025] The present invention has the following advantages: the switching device of the present invention can realize rapid switching between grid connection and off-grid, and the device has good airtightness, which can reduce the impact of dust and rain on the stability of the switching device in complex operating environments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the internal structure of the switching device of this utility model in grid-connected state;

[0027] Figure 2 This is a schematic diagram of the internal structure of the switching device of this utility model in the switching state (state one);

[0028] Figure 3 This is a schematic diagram of the internal structure of the switching device of this utility model in the switching state (state two);

[0029] Figure 4 This is a schematic diagram of the internal structure of the switching device of this utility model in the off-grid state;

[0030] Marked in the image:

[0031] 1. Connecting ring;

[0032] 2. Inverter connection ring;

[0033] 3. Adjusting ring;

[0034] 4. Adjust the knob;

[0035] 5. Grid connection terminal block;

[0036] 6. Off-grid terminal block;

[0037] 7. Through hole;

[0038] 8. Inverter terminals;

[0039] 9. Notch;

[0040] 10. Gap;

[0041] 11. Stop post. Detailed Implementation

[0042] To better understand this utility model, the following embodiments further illustrate the content of this utility model, but the content of this utility model is not limited to the following embodiments.

[0043] As shown in the figure: A grid-connected and off-grid switching device for a grid-connected energy storage inverter includes a wiring ring 1, an inverter connection ring 2, an adjustment ring 3, and an adjustment knob 4.

[0044] The terminal block 1, inverter connection ring 2, and adjusting ring 3 are all annular structures, with their dimensions decreasing sequentially. The inverter connection ring 2 is fitted inside the terminal block 1, allowing relative rotation between them. Similarly, the adjusting ring 3 is fitted inside the inverter connection ring 2, also allowing relative rotation between them. The main body materials of the terminal block 1, inverter connection ring 2, and adjusting ring 3 should be selected for their good insulation properties. The inverter connection ring 2 and the terminal block 1, as well as the adjusting ring 3 and the inverter connection ring 2, are rotatably connected by annular guide rails on the inner and outer ring surfaces.

[0045] The adjustment knob 4 is fixedly mounted on the adjustment ring 3. The adjustment knob 4 and the adjustment ring 3 are coaxially mounted. By rotating the adjustment knob 4, the adjustment ring 3 can be rotated.

[0046] The inner surface of the connection ring 1 has two grooves with their openings facing each other. A grid-connected terminal 5 and an off-grid terminal 6 are respectively installed in each groove. The inverter connection ring 2 has a through hole 7 arranged radially along the inverter connection ring 2, through which an inverter terminal 8 passes. The inverter terminal 8 is electrically connected to the inverter. When the inverter terminal 8 is electrically connected to the grid-connected terminal 5, it enters the grid-connected operation state; when the inverter terminal 8 is electrically connected to the off-grid terminal 6, it enters the off-grid operation state.

[0047] A reset spring is fitted over the inverter terminal 8. The upper end of the reset spring is fixedly connected to the inner wall of the through hole 7, and the lower end of the reset spring is fixedly connected to the inverter terminal 8. Without external force, the reset spring causes the inverter terminal 8 to tend to move radially inward.

[0048] The outer circumference of the regulating ring 3 is provided with a notch 9. The sidewall of the notch 9 of the regulating ring 3 is arc-shaped, and the lower end of the inverter terminal 8 is hemispherical, making it easier for it to slide out or slide into the notch 9. When the lower end of the inverter terminal 8 contacts the bottom of the notch 9, the upper end of the inverter terminal 8 is located inside the through hole 7. When the lower end of the inverter terminal 8 contacts the outer wall of the outer circumference of the regulating ring 3 (excluding the notch), the upper end of the inverter terminal 8 extends out of the through hole 7 and contacts the grid-connected terminal 5 / off-grid terminal 6.

[0049] The adjustment knob 4 has a notch 10, and the adjustment ring 3 has an arc-shaped through hole 7 corresponding to the notch 10. A stop post 11 passes through the arc-shaped through hole 7. The stop post 11 has a U-shaped structure, with its vertical part passing through the through hole 7 and its two horizontal parts being fixedly connected to the upper and lower end faces of the inverter connection ring 2, respectively.

[0050] like Figure 1The diagram shows the internal structure of the switching device in grid-connected mode. At this time, the lower end of the inverter terminal 8 contacts the outer wall of the non-recessed portion of the outer circle of the adjusting ring 3, and the inverter terminal 8 is lifted and contacts the grid-connected terminal 5. During switching, the adjusting knob 4 is first rotated counterclockwise. The adjusting knob 4 drives the adjusting ring 3 to rotate counterclockwise, and the inverter terminal 8 gradually slides into the recess 9 as it rotates, disengaging from the grid-connected terminal 5. During this rotation, due to the design of the notch 10, the adjusting knob 4 does not drive the inverter connecting ring 2 to rotate. Figure 2 As shown, when the adjustment knob 4 is rotated to the contact stop 11, continuing to rotate the adjustment knob 4 will cause the inverter connection ring 2 to rotate along with the stop 11, ultimately aligning the position of the inverter terminal 8 with the off-grid terminal 6. Figure 3 As shown. At this time, rotating the adjustment knob 4 in the reverse direction causes the adjustment ring 3 to rotate clockwise. As the rotation progresses, the inverter terminal 8 gradually slides out of the recess 9, and is pushed out to contact the off-grid terminal 6, as shown. Figure 4 As shown.

[0051] Marking lines are provided on the outer surfaces of the wiring ring 1 and the inverter connection ring 2. The main function of these marking lines is to indicate the rotation adjustment of the adjustment knob 4. The marking lines can be used to determine whether the knob has been rotated to the target position.

[0052] At least two grid-connected terminals 5 and at least two off-grid terminals 6 are provided. Multiple grid-connected terminals 5 and multiple off-grid terminals 6 are evenly distributed along the length of the connecting ring 1. The number of inverter terminals 8 is the same as the number of grid-connected terminals 5 / off-grid terminals 6, and multiple inverter terminals 8 are evenly distributed along the length of the inverter connecting ring 2. The number of grid-connected terminals 5 and at-grid terminals 6 is related to the number of devices to be connected.

[0053] To enhance the intelligence of the switching device, the adjustment knob 4 can be connected to the stepper motor drive, and the stepper motor can be controlled by the controller to achieve intelligent control switching.

[0054] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this utility model.

Claims

1. A grid-connected and off-grid switching device for a grid-connected energy storage inverter, characterized in that: It includes a wiring ring (1), an inverter connection ring (2), an adjustment ring (3), and an adjustment knob (4); The inverter connecting ring (2) is sleeved inside the wiring ring (1), and the inverter connecting ring (2) and the wiring ring (1) can rotate relative to each other; The regulating ring (3) is fitted inside the inverter connecting ring (2), and the regulating ring (3) and the inverter connecting ring (2) can rotate relative to each other; The adjustment knob (4) is fixedly mounted on the adjustment ring (3), and the adjustment knob (4) and the adjustment ring (3) are coaxially mounted. The inner ring surface of the wiring ring (1) has two grooves, and the grid-connected wiring terminal (5) and the off-grid wiring terminal (6) are respectively provided in the two grooves; An inverter connection ring (2) is provided with a through hole (7), which is arranged radially along the inverter connection ring (2). An inverter terminal (8) is inserted through the through hole (7). A reset spring is fitted on the inverter terminal (8). The upper end of the reset spring is fixedly connected to the inner wall of the through hole (7), and the lower end of the reset spring is fixedly connected to the inverter terminal (8). The outer circle of the adjustment ring (3) is provided with a notch (9). When the lower end of the inverter terminal (8) contacts the bottom of the notch (9), the upper end of the inverter terminal (8) is located in the through hole (7). When the lower end of the inverter terminal (8) contacts the outer wall of the outer circle of the adjustment ring (3) (excluding the notch), the upper end of the inverter terminal (8) extends out of the through hole (7) and contacts the grid-connected terminal (5) / off-grid terminal (6). The adjustment knob (4) has a notch (10), and an arc-shaped through hole (7) is provided on the adjustment ring (3) corresponding to the notch (10). A stop post (11) is inserted through the arc-shaped through hole (7). The stop post (11) has a U-shaped structure, with its vertical part inserted in the through hole (7) and its two horizontal parts fixedly connected to the upper and lower end faces of the inverter connection ring (2).

2. The grid-connected and off-grid switching device for a grid-connected energy storage inverter as described in claim 1, characterized in that: The openings of the two grooves of the connector ring (1) are arranged opposite to each other.

3. The grid-connected and off-grid switching device for a grid-connected energy storage inverter as described in claim 1, characterized in that: The lower end of the inverter terminal (8) is hemispherical.

4. The grid-connected and off-grid switching device for a grid-connected energy storage inverter as described in claim 3, characterized in that: Marking lines are provided on the outer surfaces of the wiring ring (1) and the inverter connection ring (2).

5. The grid-connected and off-grid switching device for a grid-connected energy storage inverter as described in claim 1, characterized in that: At least two grid-connected terminals (5) and at least two off-grid terminals (6) are provided. Multiple grid-connected terminals (5) and multiple off-grid terminals (6) are evenly distributed along the length direction of the connection ring (1). The number of inverter terminals (8) is the same as the number of grid-connected terminals (5) / off-grid terminals (6). Multiple inverter terminals (8) are evenly distributed along the length direction of the inverter connection ring (2).

6. The grid-connected and off-grid switching device for a grid-connected energy storage inverter as described in claim 1, characterized in that: The adjustment knob (4) has a disc-shaped structure, and the two end faces of its notch (10) are at a 90° angle.

7. The grid-connected and off-grid switching device for a grid-connected energy storage inverter as described in claim 1, characterized in that: The adjustment knob (4) is connected to the stepper motor drive.

8. The grid-connected and off-grid switching device for a grid-connected energy storage inverter as described in claim 1, characterized in that: The recess (9) sidewall of the adjustment ring (3) is an arc surface.

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