Power distribution network load self-balancing and self-stabilizing device for optical storage and charging system

Abstract

The utility model relates to the technical field of power distribution equipment, in particular to a power distribution network load self-balancing and self-stabilizing device for an optical storage and charging system, which comprises a power distribution network load monitoring unit used for monitoring load information of a power distribution network in real time; the power distribution network data analyzing and processing unit is connected with the power distribution network load monitoring unit and used for receiving the load information of the power distribution network and analyzing and processing the load information of the power distribution network; the control unit is connected with the power distribution network data analyzing and processing unit and used for receiving, judging, analyzing and processing the obtained power distribution network data information; and the commutation unit is connected with the control unit so as to carry out commutation on the three-phase circuit under the control of the control unit. Compared with a traditional measure for adjusting three-phase load imbalance, manual phase change is not needed, when the three-phase load is unbalanced, the phase change unit is controlled to carry out phase change on the three-phase circuit, adjustment can be carried out in time, and the effect of load balance is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution equipment, and more specifically to a distribution network load self-balancing and self-stabilizing device for a light storage and charging system. Background Art

[0002] In my country, the distribution network mainly adopts the three-phase four-wire power supply mode, and the distribution transformers are mostly wired. Ideally, the three-phase load is balanced and the transformer operates symmetrically, but in reality, there are a large number of impact loads on the user side, such as electric locomotives, rolling mills, AC arc furnaces, and large semiconductor converters. Due to their unbalanced impact, nonlinearity, and power consumption characteristics, they will not only cause flicker, three-phase imbalance, and voltage fluctuations, but also inject a large number of high-order harmonics into the power system. These factors will inevitably cause the three-phase load of the distribution transformer to be in an asymmetric state. The unbalanced three-phase load will have a serious impact on the distribution network: it will increase line losses, increase the active power loss of the transformer, increase the operating temperature of the distribution transformer, reduce the power of the distribution transformer, affect the output power of the motor and increase the winding temperature, produce neutral point voltage deviation, cause three-phase voltage asymmetry, and burn the user's electrical appliances in severe cases. Therefore, it is very necessary to carry out three-phase unbalanced load balancing compensation and reactive power compensation in a timely and effective manner.

[0003] Traditional measures to adjust three-phase load imbalance are to manually change the phase of the power grid, manually switch capacitors, and artificially increase the load. Although these measures can alleviate the phenomenon of three-phase load imbalance, the effect is minimal, and they cannot be adjusted in a timely and effective manner, causing damage to the low-voltage power grid and electrical equipment. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a distribution network load self-balancing and self-stabilizing device for a photovoltaic storage and charging system.

[0005] The utility model discloses a self-balancing and self-stabilizing device for a distribution network load used in a photovoltaic storage and charging system, and the technical solution adopted is:

[0006] The distribution network load self-balancing and self-stabilizing device for the photovoltaic storage and charging system includes:

[0007] Distribution network load monitoring unit, used to monitor the load information of the distribution network in real time;

[0008] The distribution network data analysis and processing unit is connected to the distribution network load monitoring unit and is used to receive the load information of the distribution network and analyze and process the load information of the distribution network;

[0009] A control unit connected to the distribution network data analysis and processing unit, configured to receive and determine the distribution network data information obtained through analysis and processing;

[0010] The phase switching unit is connected to the control unit to perform phase switching on the three-phase circuit under the control of the control unit.

[0011] Optionally, the distribution network load monitoring unit includes three current sensors to collect three-phase currents through the three current sensors; the three current sensors are all electrically connected to the distribution network data analysis and processing unit.

[0012] Optionally, the distribution network load monitoring unit further includes three voltage sensors to collect three-phase voltages through the three voltage sensors; the three voltage sensors are all electrically connected to the distribution network data analysis and processing unit.

[0013] Optionally, the distribution network load self-balancing and self-stabilizing device for the photovoltaic storage and charging system further includes a storage unit, which is electrically connected to the distribution network data analysis and processing unit to store the distribution network data information analyzed and processed by the distribution network data analysis and processing unit.

[0014] Optionally, the phase-changing unit comprises a three-phase phase-changing switch.

[0015] Optionally, the control unit is connected to the power distribution network data analysis and processing unit via a wireless communication unit.

[0016] Optionally, the current sensor includes a Hall current sensor body, a base and a positioning clamping mechanism; the Hall current sensor body is fixed on the base, and the Hall current sensor body is provided with a middle through hole for the cable to pass through; two positioning clamping mechanisms are fixed on the base, and the two positioning clamping mechanisms are relatively arranged on both sides of the Hall current sensor body.

[0017] Optionally, the base includes a seat body, a Hall current sensor body is fixed in the middle of the upper surface of the seat body, an inner slide of the adjustment slide of the seat body cooperates with two relatively arranged sliding supports, the middle parts of the two sliding supports slide in the two slide grooves of the seat body, the two sliding supports are connected one by one with the two positioning clamping mechanisms, the two sliding supports are threadedly connected to the two ends of the bidirectional screw, and the middle part of the bidirectional screw rotates in the adjustment slide through the rod seat.

[0018] Optionally, the positioning and clamping mechanism includes a positioning ring, the lower end of which is connected to a sliding support, the positioning ring is provided with a plurality of inner and outer sliding holes, the plurality of inner and outer sliding holes are all slidably connected to inner and outer racks, a V-shaped clamp is fixed to the inner end of each inner and outer rack, the outer end of each inner and outer rack is meshed with a gear, and the plurality of gears are rotated on the positioning ring through a wheel seat; the positioning ring is rotatably connected to a rotating ring, an outer gear ring and a worm wheel are fixed to the rotating ring, the outer gear ring is meshed with the plurality of gears; the worm wheel is meshed with a worm rotating on the positioning ring.

[0019] Optionally, a V-shaped insulating rubber pad is bonded in the V-shaped groove of the V-shaped clip.

[0020] It can be seen from the above scheme that, compared with the traditional measures for adjusting the imbalance of three-phase load, the utility model does not require manual phase change. A distribution network load monitoring unit is provided inside the utility model, which can monitor the load information of the distribution network in real time, and transmit the load information to the distribution network data analysis and processing unit for analysis and processing. The distribution network data information after analysis and processing is transmitted to the control unit, and the control unit makes a judgment according to the preset standard. Therefore, when the three-phase load is unbalanced, the phase change unit is controlled to change the phase of the three-phase circuit, and timely adjustment can be made to achieve the effect of load balance.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 A schematic diagram of a distribution network load self-balancing and self-stabilizing device for a photovoltaic storage and charging system provided in an embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the first angle structure of the current sensor provided by an embodiment of the utility model;

[0025] Figure 3 A schematic diagram of the second angle structure of the current sensor provided by an embodiment of the utility model;

[0026] Figure 4 A schematic diagram of the structure of a base provided in an embodiment of the utility model;

[0027] Figure 5 A schematic structural diagram of a positioning and clamping mechanism provided in an embodiment of the utility model.

[0028] Icons: distribution network load monitoring unit 1; distribution network data analysis and processing unit 2; control unit 3; commutation unit 4; current sensor 5; Hall current sensor body 6; base 7; positioning clamping mechanism 8; seat body 9; sliding support 10; bidirectional screw 11; positioning ring 12; inner and outer racks 13; V-shaped clamp 14; gear 15; outer gear ring 16; worm wheel 17; worm 18. DETAILED DESCRIPTION

[0029] In order to clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention, it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0031] See also Figure 1-5 The utility model provides a self-balancing and self-stabilizing device for a distribution network load of a photovoltaic storage and charging system, comprising:

[0032] The distribution network load monitoring unit 1 is used to monitor the load information of the distribution network in real time;

[0033] The distribution network data analysis and processing unit 2 is connected to the distribution network load monitoring unit 1 and is used to receive the load information of the distribution network and analyze and process the load information of the distribution network;

[0034] The control unit 3 is connected to the distribution network data analysis and processing unit 2, and is used to receive and judge the distribution network data information obtained by analysis and processing;

[0035] The phase switching unit 4 is connected to the control unit 3 to perform phase switching on the three-phase circuit under the control of the control unit 3.

[0036] The utility model discloses a self-balancing and self-stabilizing device for the distribution network load of a photovoltaic storage and charging system, which can realize automatic phase switching without manual phase switching. A distribution network load monitoring unit 1 is provided inside the device, which can monitor the load information of the distribution network in real time, and transmit the load information to the distribution network data analysis and processing unit 2 for analysis and processing. The distribution network data information after analysis and processing is transmitted to the control unit 3, and the control unit 3 makes a judgment according to a preset standard, so that when the three-phase load is unbalanced, the phase switching unit 4 is controlled to switch the three-phase circuit, and timely adjustment can be made to achieve the effect of load balancing.

[0037] The distribution network load monitoring unit 1 includes three current sensors 5, which collect three-phase currents through the three current sensors 5, thereby effectively measuring and collecting current data on the three-phase branches, obtaining relatively accurate current information, and ensuring the accuracy of monitoring; the three current sensors 5 are all electrically connected to the distribution network data analysis and processing unit 2, so as to transmit the measured and collected current information to the distribution network data analysis and processing unit 2 for analysis and processing, so as to facilitate real-time monitoring.

[0038] The distribution network load monitoring unit 1 also includes three voltage sensors, which collect the three-phase voltage through the three voltage sensors, thereby effectively measuring and collecting the voltage data on the three-phase branches, obtaining more accurate voltage information, and ensuring the accuracy of monitoring; the three voltage sensors are all electrically connected to the distribution network data analysis and processing unit 2 to transmit the measured and collected voltage information to the distribution network data analysis and processing unit 2 for analysis and processing.

[0039] The distribution network load self-balancing and self-stabilizing device for the photovoltaic storage and charging system also includes a storage unit, which is electrically connected to the distribution network data analysis and processing unit 2 to store the distribution network data information analyzed and processed by the distribution network data analysis and processing unit 2.

[0040] The phase-changing unit 4 includes a three-phase phase-changing switch, and a conventional phase-changing switch purchased on the market can be used.

[0041] The control unit 3 is connected to the power distribution network data analysis and processing unit 2 via a wireless communication unit, or may be connected via a cable, so as to improve the stability of data transmission.

[0042] The current sensor 5 includes a Hall current sensor body 6, a base 7 and a positioning clamping mechanism 8; the Hall current sensor body 6 is fixed on the base 7, and a middle through hole is provided on the Hall current sensor body 6 for the cable to pass through; two positioning clamping mechanisms 8 are fixed on the base 7, and the two positioning clamping mechanisms 8 are relatively arranged on both sides of the Hall current sensor body 6.

[0043] The structural setting of the current sensor 5 can effectively solve the problems existing in the prior art when the current sensor 5 collects and measures the current of the cable or wire. When the current sensor 5 in the prior art collects and measures the current of the cable or wire, it is usually fixed on the cable or wire with a binding tape or an adhesive tape, which makes it inconvenient to adjust the fixed position and easily causes the cable or wire to bend, affecting the measurement result. When the current sensor 5 in the utility model is used, the cable or wire is controlled to pass through the positioning clamping mechanism 8 on both sides and the Hall current sensor body 6 in the center, and then the base 7 can be fixed in the corresponding position or placed in the air. After the required adjustment is completed, After the position of the cable or wire to be measured is determined, the two positioning clamping mechanisms 8 are controlled to clamp on both sides of the cable or wire, so that the cable or wire segment measured by the Hall current sensor body 6 is in a straight state without bending, thereby preventing the bending of the cable or wire segment from affecting the measurement result, and it is convenient to release the limit lock of the cable or wire by the two positioning clamping mechanisms 8, so as to conveniently change the measurement position; the installation is carried out through the two positioning clamping mechanisms 8, so that the installation position is adjustable, which is convenient for installation at a position with larger current in the circuit to ensure the accuracy of the measurement, and the installation position can be adjusted to be close to the electrical equipment to be measured to reduce the loss of signal transmission.

[0044] The base 7 includes a seat body 9, and a Hall current sensor body 6 is fixed in the middle of the upper surface of the seat body 9. The inner slide of the adjustment slide of the seat body 9 cooperates with two relatively arranged sliding supports 10. The middle parts of the two sliding supports 10 slide in the two slide grooves of the seat body 9. The two sliding supports 10 are connected one by one with the two positioning clamping mechanisms 8. The two sliding supports 10 are threadedly connected to the two ends of the bidirectional screw 11, and the middle part of the bidirectional screw 11 rotates in the adjustment slide through the rod seat.

[0045] The four corners of the seat body 9 are provided with bolt connection holes to facilitate the installation of the seat body 9. The two sliding supports 10 are connected one by one with the two positioning clamping mechanisms 8. The relative positions of the two positioning clamping mechanisms 8 and the Hall current sensor body 6 can be adjusted by changing the relative positions of the two sliding supports 10 and the seat body 9, which is convenient for adjusting the two positioning clamping mechanisms 8 to clamp at different positions of the cable or wire. During adjustment, the bidirectional screw 11 is rotated to change the contact position of the bidirectional screw 11 and the two sliding supports 10, thereby driving the two sliding supports 10 to slide toward or away from each other in the adjustment slideway and two slide grooves of the seat body 9. The adjustment is very convenient and practical.

[0046] The positioning and clamping mechanism 8 includes a positioning ring 12, the lower end of which is connected to the sliding support 10, and the positioning ring 12 is provided with a plurality of inner and outer sliding holes, and the inner and outer racks 13 are slidably connected in the plurality of inner and outer sliding holes, a V-shaped clip 14 is fixed to the inner end of each inner and outer rack 13, and the outer end of each inner and outer rack 13 is meshed with a gear 15, and the plurality of gears 15 are rotated on the positioning ring 12 through the wheel seat; the positioning ring 12 is rotatably connected to a rotating ring, and an outer gear ring 16 and a worm wheel 17 are fixed to the rotating ring, and the outer gear ring 16 is meshed with the plurality of gears 15; the worm wheel 17 is meshed with a worm 18 rotating on the positioning ring 12.

[0047] The positioning and clamping mechanism 8 is used to clamp and fix cables or wires. When in use, the cables or wires need to be passed through the center hole of the positioning ring 12, and then the worm 18 is rotated to control the rotation of the worm wheel 17. When the worm wheel 17 rotates, the rotating ring can be controlled to rotate. When the rotating ring rotates, the outer gear ring 16 can be driven to rotate. When the outer gear ring 16 rotates, the multiple gears 15 are engaged to rotate, thereby driving the multiple inner and outer racks 13 to slide in the multiple inner and outer sliding holes. When the cables or wires need to be clamped, the multiple inner and outer racks 13 are controlled to slide inwardly in the multiple inner and outer sliding holes, so that the V-shaped clamps 14 at the inner ends of the multiple inner and outer racks 13 are clamped on the cables or wires. When the clamping of the cables or wires needs to be released, the multiple inner and outer racks 13 are controlled to slide outwardly in the multiple inner and outer sliding holes.

[0048] A V-shaped insulating rubber pad is bonded in the V-shaped groove of the V-shaped clip 14 .

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A self-balancing and self-stabilizing device for distribution network loads in a photovoltaic storage and charging system, characterized in that: include: A distribution network load monitoring unit (1), used for real-time monitoring of the load information of the distribution network; A distribution network data analysis and processing unit (2) is connected to the distribution network load monitoring unit (1) and is used to receive the load information of the distribution network and analyze and process the load information of the distribution network; A control unit (3) is connected to the distribution network data analysis and processing unit (2) and is used to receive and judge the distribution network data information obtained through analysis and processing; The phase switching unit (4) is connected to the control unit (3) to perform phase switching on the three-phase circuit under the control of the control unit (3).

2. The self-balancing and self-stabilizing device for distribution network load for a photovoltaic storage and charging system according to claim 1 is characterized in that: The distribution network load monitoring unit (1) comprises three current sensors (5) for collecting three-phase currents through the three current sensors (5); the three current sensors (5) are all electrically connected to the distribution network data analysis and processing unit (2).

3. The self-balancing and self-stabilizing device for distribution network load for a photovoltaic storage and charging system according to claim 2 is characterized in that: The distribution network load monitoring unit (1) also includes three voltage sensors for collecting three-phase voltages through the three voltage sensors; the three voltage sensors are all electrically connected to the distribution network data analysis and processing unit (2).

4. The self-balancing and self-stabilizing device for distribution network load for a photovoltaic storage and charging system according to claim 3 is characterized in that: It also comprises a storage unit, which is electrically connected to the distribution network data analysis and processing unit (2) to store the distribution network data information analyzed and processed by the distribution network data analysis and processing unit (2).

5. The self-balancing and self-stabilizing device for distribution network load for a photovoltaic storage and charging system according to claim 3 is characterized in that: The phase-changing unit (4) comprises a three-phase phase-changing switch.

6. The self-balancing and self-stabilizing device for distribution network load for a photovoltaic storage and charging system according to claim 3 is characterized in that: The control unit (3) is connected to the power distribution network data analysis and processing unit (2) via a wireless communication unit.

7. The self-balancing and self-stabilizing device for distribution network load for a photovoltaic storage and charging system according to claim 2, characterized in that: The current sensor (5) comprises a Hall current sensor body (6), a base (7) and a positioning clamping mechanism (8); the Hall current sensor body (6) is fixed on the base (7), and a middle through hole for a cable to pass through is provided on the Hall current sensor body (6); two positioning clamping mechanisms (8) are fixed on the base (7), and the two positioning clamping mechanisms (8) are arranged oppositely on two sides of the Hall current sensor body (6).

8. The self-balancing and self-stabilizing device for distribution network load of a photovoltaic storage and charging system according to claim 7 is characterized in that: The base (7) comprises a base body (9), a Hall current sensor body (6) is fixed in the middle of the upper surface of the base body (9), an adjusting slideway of the base body (9) cooperates with two sliding supports (10) arranged oppositely, the middle parts of the two sliding supports (10) slide in two slide grooves of the base body (9), the two sliding supports (10) are connected one by one with two positioning clamping mechanisms (8), the two sliding supports (10) are threadedly connected to the two ends of the bidirectional screw (11), and the middle part of the bidirectional screw (11) rotates in the adjusting slideway through the rod seat.

9. The self-balancing and self-stabilizing device for distribution network load for a photovoltaic storage and charging system according to claim 8, characterized in that: The positioning clamping mechanism (8) comprises a positioning ring (12), the lower end of which is connected to the sliding support (10), the positioning ring (12) is provided with a plurality of inner and outer sliding holes, the inner and outer racks (13) are all slidably connected in the plurality of inner and outer sliding holes, a V-shaped clamp (14) is fixed to the inner end of each inner and outer rack (13), the outer end of each inner and outer rack (13) is meshed with a gear (15), and the plurality of gears (15) are all rotated on the positioning ring (12) through a wheel seat; the positioning ring (12) is rotatably connected to a rotating ring, an outer gear ring (16) and a worm wheel (17) are fixed to the rotating ring, the outer gear ring (16) is meshed with the plurality of gears (15); the worm wheel (17) is meshed with a worm (18) rotating on the positioning ring (12).

10. The self-balancing and self-stabilizing device for distribution network load for a photovoltaic storage and charging system according to claim 9, characterized in that: A V-shaped insulating rubber pad is bonded in the V-shaped groove of the V-shaped clip (14).

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