Capacitor device and power supply grid system

Abstract

The utility model provides a capacitor device and a power supply grid system, the capacitor device is used for accessing a three-phase power grid, and the capacitor device comprises an operation panel and one or more intelligent capacitor units. The first output end of each intelligent capacitor unit in the one or more intelligent capacitor units is electrically connected with the first end of the operation panel, and the second output end of one intelligent capacitor unit is electrically connected with the second end of the operation panel. The operation panel obtains a first switching instruction according to the current switching state of each intelligent capacitor unit output by the one or more intelligent capacitor units and the system current, and sends the first switching instruction to the one or more intelligent capacitor units, so that a circuit structure for calculating the first switching instruction in the intelligent capacitor units is saved; the structure of the intelligent capacitor unit is simplified, and the cost and the failure rate of the capacitor device are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of capacitors, and in particular to a capacitor device and a power supply grid system. Background Art

[0002] At present, the inductive load in the power grid may generate reactive power during operation, which not only increases the power loss in the power grid, but also reduces the power factor of the power grid, thus affecting the operation efficiency of the power grid. The smart capacitor system compensates for the reactive power generated by the inductive load by putting an appropriate number of smart capacitors into the power grid.

[0003] In the conventional technology, each smart capacitor in the smart capacitor system may include a current sampling circuit and a switching calculation unit. The current sampling circuit is responsible for collecting the current signal in the power grid in real time. The switching calculation unit is responsible for calculating the reactive power and formulating the switching strategy according to the reactive power, so as to put the appropriate number of smart capacitors into the power grid or remove them from the power grid.

[0004] However, the intelligent capacitor system includes a host device and a slave device, and both the host device and the slave device can be intelligent capacitors in the intelligent capacitor system, which makes the structure of the host device and the slave device the same. When the intelligent capacitor system is running, the host device needs to sample the current signal and formulate the switching strategy, while the slave device does not sample the current signal and formulate the switching strategy. Therefore, the current sampling circuit and the switching calculation unit provided in the slave device are redundant, and the current sampling circuit and the switching calculation unit are provided in the slave device to increase the complexity of the slave device, resulting in a waste of hardware resources. Utility Model Content

[0005] The present application provides a capacitor device and a power supply grid system, which reduces the cost and failure rate of the capacitor device by simplifying the structure of the capacitor device, thereby improving the safety of the capacitor device and the power supply grid system.

[0006] In a first aspect, the present application provides a capacitor device, which is used to access a three-phase power grid. The capacitor device includes: an operation panel and one or more intelligent capacitor units.

[0007] The system end of the operation panel and the system end of one of the one or more smart capacitor units are electrically connected to the three-phase power grid respectively, the first output end of each of the one or more smart capacitor units is electrically connected to the first end of the operation panel respectively, and the second output end of one of the smart capacitor units is electrically connected to the second end of the operation panel.

[0008] Each of the one or more smart capacitor units is used to send the current switching state of the smart capacitor unit to the operation panel.

[0009] One of the intelligent capacitor units is used to determine the system voltage corresponding to the three-phase power grid and send the system voltage to the operation panel.

[0010] The operation panel is used to determine the system current corresponding to the three-phase power grid.

[0011] The operation panel is also used to send a first switching instruction to each smart capacitor unit in one or more smart capacitor units according to the current switching state of each smart capacitor unit, the system voltage and the system current, and the first switching instruction is used to indicate the updated switching state of the corresponding smart capacitor unit.

[0012] The capacitor device provided by the present application is connected to the second end of the operation panel through the second output end of one of the smart capacitor units, and one of the smart capacitor units sends the system voltage to the operation panel, so that the operation panel can obtain the system voltage from one of the smart capacitor units. The system end of the operation panel is connected to the three-phase power grid, and the operation panel samples the system current from the three-phase power grid. Through the electrical connection of each smart capacitor unit to the first end of the operation panel, the operation panel receives the current switching state of each smart capacitor unit sent by each smart capacitor unit. The operation panel obtains the first switching instruction according to the system voltage, the current switching state of each smart capacitor unit and the system current. Through the electrical connection of each smart capacitor unit in one or more smart capacitor units to the first end of the operation panel, the operation panel can send the first switching instruction to the corresponding smart capacitor unit, and the corresponding smart capacitor unit is put into the three-phase power grid or cut off from the three-phase power grid according to the first switching instruction. The operation panel obtains the system voltage from one of the smart capacitor units, and the circuit structure for obtaining the system voltage is saved in the operation panel, which makes the circuit structure of the operation panel simpler. The operation panel obtains a first switching instruction according to the system voltage, the current switching state of each smart capacitor unit and the system current, and sends the first switching instruction to the corresponding smart capacitor unit in one or more smart capacitor units, thereby saving the circuit structure for calculating the first switching instruction in one or more smart capacitor units, simplifying the structure of one or more smart capacitor units, reducing the cost and failure rate of the capacitor device, and improving the safety of the capacitor device.

[0013] In one possible design, the smart capacitor unit includes: a first processor, a main circuit, a relay drive circuit, a voltage conversion circuit and a first communication circuit.

[0014] The first end of the voltage conversion circuit and the first end of the main circuit are both electrically connected to the three-phase power grid, the first output end of the voltage conversion circuit is electrically connected to the first end of the first processor, the second end of the first processor is electrically connected to the first end of the relay drive circuit, the second end of the relay drive circuit is electrically connected to the second end of the main circuit, the third end of the first processor is electrically connected to the first end of the first communication circuit, and the second end of the first communication circuit is electrically connected to the first end of the operation panel.

[0015] With respect to the voltage conversion circuit in one of the smart capacitor units, the voltage conversion circuit includes a second output terminal, and the second output terminal is electrically connected to the second terminal of the operation panel.

[0016] The voltage conversion circuit is used to determine the system voltage corresponding to the three-phase power grid and send the system voltage to the first processor.

[0017] The first processor is used to send the current switching state of the intelligent capacitor unit to the first communication circuit according to the system voltage.

[0018] The first communication circuit is used to send the current switching state of the intelligent capacitor unit to the operation panel.

[0019] For one of the smart capacitor units, the voltage conversion circuit is also used to send the system voltage to the operation panel.

[0020] The operation panel is specifically used to send a first switching instruction to the first communication circuit according to the current switching state of the intelligent capacitor unit and the system voltage.

[0021] The first communication circuit is also used to send a first switching instruction to the first processor.

[0022] The first processor is further used to determine the switching drive instruction according to the first switching instruction, and send the switching drive instruction to the relay drive circuit.

[0023] The relay drive circuit is used to send a switching drive signal to the main circuit according to the switching drive instruction, so that the intelligent capacitor unit corresponding to the main circuit is put into the three-phase power grid or cut off from the three-phase power grid.

[0024] In a possible design, the smart capacitor unit further includes: a power conversion circuit.

[0025] The power supply end of the power conversion circuit is electrically connected to the three-phase power grid, and the output end of the power conversion circuit is electrically connected to the first processor, the relay drive circuit, the voltage conversion circuit and the first communication circuit respectively.

[0026] For the power conversion circuit in one of the smart capacitor units, the output end of the power conversion circuit is also electrically connected to the second end of the operation panel.

[0027] The power conversion circuit is used to provide power supply voltage to the relay drive circuit, the first processor and the first communication circuit respectively.

[0028] For one of the smart capacitor units, the power conversion circuit is also used to provide a power supply voltage to the operation panel.

[0029] In a possible design, the smart capacitor unit further includes: an indication circuit.

[0030] The indicating circuit is electrically connected to the fourth terminal of the first processor.

[0031] The indicating circuit is used to indicate the switching status of the intelligent capacitor unit.

[0032] Based on this, the indication circuit allows the user to intuitively obtain whether the corresponding smart capacitor unit is in the on-state or off-state through the LED indicator light on the housing of the smart capacitor unit or the housing of the capacitor device.

[0033] In a possible design, the main circuit includes: a plurality of circuit breakers, a plurality of magnetic latching relays, and a plurality of capacitor groups.

[0034] The first ends of the multiple circuit breakers are electrically connected to the three-phase power grid, the second ends of the multiple circuit breakers are electrically connected to the first ends of the multiple magnetic latching relays, the second ends of the multiple magnetic latching relays are electrically connected to the multiple groups of capacitors, and the third ends of the multiple magnetic latching relays are electrically connected to the second end of the relay drive circuit.

[0035] In one possible design, the operation panel includes: a second processor, a second communication circuit and a current sampling circuit.

[0036] The first end of the current sampling circuit is electrically connected to the three-phase power grid, the second end of the current sampling circuit is electrically connected to the first end of the second processor, the second end of the second processor is electrically connected to the first end of the second communication circuit, the second end of the second communication circuit is connected to the first output end of each smart capacitor unit, and the second output end of one of the smart capacitor units is electrically connected to the third end of the second processor.

[0037] The current sampling circuit is used to determine the system current corresponding to the three-phase power grid and send the system current to the second processor.

[0038] The second communication circuit is used to receive the system voltage sent by one of the smart capacitor units and send the system voltage to the second processor.

[0039] The second processor is used to receive the system voltage sent by one of the smart capacitor units and send the system voltage to the second processor.

[0040] The second processor is further used to send a first switching instruction to the second communication circuit according to the system current, the system voltage and the current switching state of the intelligent capacitor unit.

[0041] The second communication circuit is also used to send the first switching instruction to each intelligent capacitor unit.

[0042] In a possible design, the operation panel also includes: a display circuit.

[0043] The display circuit is electrically connected to the fourth terminal of the second processor.

[0044] The display circuit is used to display the switching status of each intelligent capacitor unit.

[0045] Based on this, the display circuit can provide feedback and guidance to the user by displaying the current switching status of each smart capacitor unit, thereby ensuring the safe and stable operation of the capacitor device.

[0046] In a possible design, the operation panel also includes: a key circuit.

[0047] The key circuit is electrically connected to the fifth terminal of the second processor.

[0048] A key circuit is used to send a key signal to the second processor after receiving a key operation from the user, wherein the key signal is used to instruct a first smart capacitor unit among the one or more smart capacitor units to be put into a three-phase power grid and / or a second smart capacitor unit among the one or more smart capacitor units to be removed from the three-phase power grid.

[0049] The second processor is further used to send a second switching instruction to the second communication circuit according to the key signal.

[0050] The second communication circuit is also used to send a second switching instruction to a first smart capacitor unit among the one or more smart capacitor units.

[0051] In a possible design, the capacitor device further includes: an interface circuit.

[0052] A second output end of one of the intelligent capacitor units is electrically connected to a first end of the interface circuit, and a second end of the interface circuit is electrically connected to a second end of the operation panel.

[0053] Based on this, the user can adjust the connection order of each smart capacitor unit in the multiple smart capacitor units according to actual needs.

[0054] In a second aspect, the present application provides a power supply grid system, including: a three-phase grid, a grid reading circuit, and a capacitor device.

[0055] The output end of the operation panel is electrically connected to the power grid reading circuit.

[0056] The operation panel is also used to transmit the current switching status of each smart capacitor unit, system voltage and system current to the grid reading circuit.

[0057] The beneficial effects provided in the above-mentioned second aspect and various possible designs of the above-mentioned second aspect can refer to the beneficial effects brought about by the above-mentioned first aspect and various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 A schematic diagram of the structure of a power supply grid system according to an embodiment of the present application;

[0059] Figure 2 A schematic diagram of the structure of a capacitor device according to an embodiment of the present application;

[0060] Figure 3 A schematic diagram of the structure of another capacitor device according to an embodiment of the present application;

[0061] Figure 4 A schematic diagram of the structure of one of the smart capacitor units in an embodiment of the present application;

[0062] Figure 5 It is a schematic diagram of the structure of the remaining smart capacitor units of the embodiment of the present application;

[0063] Figure 6 A schematic diagram of the structure of an operation panel according to an embodiment of the present application;

[0064] Figure 7 This is a schematic diagram of the structure of a third smart capacitor unit according to an embodiment of the present application;

[0065] Figure 8 A schematic diagram of the circuit structure of a main circuit of an embodiment of the present application;

[0066] Fig. 9 A schematic diagram of the structure of another operating panel according to an embodiment of the present application.

[0067] Explanation of the reference numerals: 10—three-phase power grid; 20—power grid reading circuit; 30—capacitor device; 31—operation panel; 32—intelligent capacitor unit; 33—interface circuit; 321—first processor; 322—relay drive circuit; 323—main circuit; 324—voltage conversion circuit; 325—first communication circuit; 326—indication circuit; 311—second processor; 312—current sampling circuit; 313—second communication circuit; 314—display circuit; 315—key circuit. DETAILED DESCRIPTION

[0068] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0069] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0070] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] Exemplarily, an embodiment of the present application proposes a power supply grid system.

[0072] Next, combine Figure 1 , a power supply grid system proposed in an embodiment of the present application is described in detail.

[0073] See also Figure 1 , Figure 1 FIG. 1 is a schematic diagram of a power grid system according to an embodiment of the present application. Figure 1 As shown, a power supply grid system proposed in an embodiment of the present application may include: a three-phase grid 10, a grid reading circuit 20 and a capacitor device 30.

[0074] The output terminal of the operation panel in the capacitor device 30 is electrically connected to the grid reading circuit 20 .

[0075] The three-phase power grid 10 may include a three-phase four-wire power grid and a three-phase three-wire power grid. The three-phase four-wire power grid includes three phase conductors, namely, an A-phase power line, a B-phase power line, and a C-phase power line, and an N-phase power line as a neutral conductor, for a total of four conductors. The three-phase three-wire power grid includes three phase conductors, namely, an A-phase power line, a B-phase power line, and a C-phase power line, for a total of three conductors. The three-phase power grid 10 may provide a system voltage and a system current to the capacitor device 30. This application is described by taking a three-phase three-wire power grid as an example.

[0076] The capacitor device 30 can obtain the system voltage and system current by sampling from the three-phase power grid 10. The capacitor device 30 may include an operation panel, and the operation panel may transmit capacitor device information to the power grid reading circuit 20 according to the system voltage and system current. The capacitor device information may include: the current switching state of each smart capacitor unit in the capacitor device 30, the system voltage, and the system current.

[0077] The grid reading circuit 20 can obtain the capacitor device information from the capacitor device 30 .

[0078] The grid reading circuit 20 can determine whether the capacitor device 30 is in a normal working state based on the capacitor device information. In this way, the grid reading circuit 20 can promptly discover potential safety hazards and fault points of the capacitor device 30 and issue early warnings in a timely manner, thereby ensuring the safe and stable operation of the power supply grid system.

[0079] The capacitor device 30 is put into the three-phase grid 10 to realize reactive power compensation for the three-phase grid 10, thereby reducing reactive power in the three-phase grid 10. At the same time, the capacitor device 30 reduces the resource waste of circuit components by adopting a simple circuit structure.

[0080] In the power supply grid system proposed in the present application, the capacitor device 30 can be put into the three-phase grid 10 or removed from the three-phase grid 10 to complete the reactive power compensation of the three-phase grid 10. The circuit structure of the capacitor device 30 is simple, and the complexity and cost of the capacitor device 30 are reduced, which reduces the maintenance difficulty and failure rate of the capacitor device 30, thereby helping to improve the reliability of the power supply grid system. At the same time, the simple circuit structure of the capacitor device 30 reduces the failure points of the capacitor device 30, reduces the safety risk of the capacitor device 30, and enhances the stability of the three-phase grid 10.

[0081] Next, combine Figure 2 , a capacitor device 30 proposed in an embodiment of the present application is described in detail.

[0082] See also Figure 2 , Figure 2 FIG. 1 is a schematic diagram of a capacitor device according to an embodiment of the present application. Figure 2 As shown, the capacitor device 30 is used to access the three-phase power grid 10 , and the capacitor device 30 includes: an operation panel 31 and one or more intelligent capacitor units 32 .

[0083] The system end of the operation panel 31 and the system end of one of the one or more smart capacitor units 32 are electrically connected to the three-phase power grid 10 respectively, the first output end of each of the one or more smart capacitor units 32 is electrically connected to the first end of the operation panel 31 respectively, and the second output end of one of the smart capacitor units 32 is electrically connected to the second end of the operation panel 31.

[0084] Figure 2 In the figure, the system end of one of the smart capacitor units 32 is recorded as 1, the system end of the operation panel 31 is recorded as 3, the first output end of each smart capacitor unit 32 is recorded as 2, the first end of the operation panel 31 is recorded as 1, the second output end of one of the smart capacitor units 32 is recorded as 3, and the second end of the operation panel 31 is recorded as 2.

[0085] The number of smart capacitor units 32 is Q, where Q is an integer greater than or equal to 1. The smart capacitor unit 32 can receive a first switching instruction from the operation panel 31, and the first switching instruction can indicate an updated switching state of the corresponding smart capacitor unit 32, and the switching state can include an input state and a cut-off state. The corresponding smart capacitor unit 32 inputs itself into the three-phase power grid 10 or cuts off from the three-phase power grid 10 according to the first switching instruction. The smart capacitor unit 32 can also collect system voltage, and the smart capacitor unit 32 sends the collected system voltage to the operation panel 31. The smart capacitor unit 32 can also send the current switching state of each smart capacitor unit 32 to the operation panel 31.

[0086] The operation panel 31 receives the system voltage sent by the smart capacitor unit 32 and the current switching status of each smart capacitor unit 32. The operation panel 31 can also sample the system current in the three-phase power grid 10. The operation panel 31 sends a first switching instruction to the corresponding smart capacitor unit 32 based on the system current, the system voltage, and the current switching status of each smart capacitor unit 32.

[0087] The operation panel 31 calculates the reactive power of the three-phase power grid 10 according to the system current and the system voltage, and sends a first switching instruction to the corresponding smart capacitor unit 32 in combination with the current switching status of each smart capacitor unit 32 .

[0088] (1) For one of the one or more smart capacitor units 32:

[0089] The smart capacitor unit 32 can receive the first switching instruction of the operation panel 31, and the smart capacitor unit 32 is put into the three-phase power grid 10 or cut off from the three-phase power grid 10 according to the first switching instruction. The smart capacitor unit 32 can also send the current switching status of each smart capacitor unit 32 to the operation panel 31. The smart capacitor unit 32 can also collect the system voltage, and the smart capacitor unit 32 outputs the sampled system voltage to the operation panel 31.

[0090] Among them, one of the smart capacitor units 32 may be a smart capacitor unit 32 connected to the second end of the operation panel 31 .

[0091] (2) For the remaining smart capacitor units 32 except one of the one or more smart capacitor units 32:

[0092] The smart capacitor unit 32 can receive the first switching instruction from the operation panel 31, and the smart capacitor unit 32 can switch itself into the three-phase power grid 10 or disconnect itself from the three-phase power grid 10 according to the first switching instruction. The smart capacitor unit 32 can also send the current switching status of each smart capacitor unit 32 to the operation panel 31.

[0093] One of the smart capacitor units 32 outputs the sampled system voltage to the operation panel 31. The remaining smart capacitor units 32 do not need to output the sampled system voltage to the operation panel 31. The operation panel 31 does not need to set a circuit structure for sampling the system voltage in its own structure, thereby saving the circuit structure of the operation panel 31.

[0094] The operation panel 31 sends a first switching instruction to a corresponding smart capacitor unit 32 in one or more smart capacitor units 32 through the current switching state, system voltage, and system current of each smart capacitor unit 32, and no structure for calculating reactive power is provided in one or more smart capacitor units 32. The structure of one or more smart capacitor units 32 is simplified, the cost and failure rate of the capacitor device 30 are reduced, and the safety of the capacitor device 30 is improved.

[0095] The capacitor device provided by the present application is connected to the second end of the operation panel through the second output end of one of the smart capacitor units, and one of the smart capacitor units sends the system voltage to the operation panel, so that the operation panel can obtain the system voltage from one of the smart capacitor units. The system end of the operation panel is connected to the three-phase power grid, and the operation panel samples the system current from the three-phase power grid. Through the electrical connection of each smart capacitor unit to the first end of the operation panel, the operation panel receives the current switching state of each smart capacitor unit sent by each smart capacitor unit. The operation panel obtains the first switching instruction according to the system voltage, the current switching state of each smart capacitor unit and the system current. Through the electrical connection of each smart capacitor unit in one or more smart capacitor units to the first end of the operation panel, the operation panel can send the first switching instruction to the corresponding smart capacitor unit, and the corresponding smart capacitor unit is put into the three-phase power grid or cut off from the three-phase power grid according to the first switching instruction. The operation panel obtains the system voltage from one of the smart capacitor units, and the circuit structure for obtaining the system voltage is saved in the operation panel, which makes the circuit structure of the operation panel simpler. The operation panel obtains a first switching instruction according to the system voltage, the current switching state of each smart capacitor unit and the system current, and sends the first switching instruction to the corresponding smart capacitor unit in one or more smart capacitor units, thereby saving the circuit structure for calculating the first switching instruction in one or more smart capacitor units, simplifying the structure of one or more smart capacitor units, reducing the cost and failure rate of the capacitor device, and improving the safety of the capacitor device.

[0096] Combine the following Figure 3 , another implementation method of the capacitor device 30 provided in the present application is introduced in detail. Figure 3 FIG. 4 is a schematic diagram of the structure of another capacitor device according to an embodiment of the present application.

[0097] like Figure 3 As shown, the capacitor device 30 provided in the present application may further include: an interface circuit 33 .

[0098] A second output terminal of one of the smart capacitor units 32 is electrically connected to a first terminal of the interface circuit 33 , and a second terminal of the interface circuit 33 is electrically connected to a second terminal of the operation panel 31 .

[0099] Figure 3 In the figure, the first end of the interface circuit 33 is marked as 1, and the second end of the interface circuit 33 is marked as 2.

[0100] The interface circuit 33 can be provided separately or in each smart capacitor unit 32. Each smart capacitor unit 32 in one or more smart capacitor units 32 can be connected to the operation panel 31 through the interface circuit 33. The operation panel 31 can be connected to one smart capacitor unit 32 in each smart capacitor unit 32.

[0101] When one of the multiple smart capacitor units 32 is connected to the operation panel 31 through the interface circuit 33, the one smart capacitor unit 32 is one of the smart capacitor units 32. One of the smart capacitor units 32 outputs the system voltage to the operation panel 31 through the interface circuit 33, so that the operation panel 31 sends the first switching instruction to the smart capacitor unit 32 according to the system voltage.

[0102] Therefore, the user can adjust the connection sequence of each smart capacitor unit 32 in the plurality of smart capacitor units 32 according to actual needs.

[0103] As a feasible implementation, the current switching state in one of the smart capacitor units 32 can be sent to the operation panel 31 through the interface circuit 33. In this way, one of the smart capacitor units 32 no longer outputs the current switching state to the operation panel 31 through the first output terminal.

[0104] Combine the following Figure 4 and Figure 5 , the smart capacitor unit 32 proposed in this application is introduced in detail. Figure 4 This is a schematic diagram of the structure of one of the smart capacitor units in the embodiment of the present application. Figure 5 Schematic diagram of the structure of other smart capacitor units in the embodiments of the present application.

[0105] like Figure 4 and Figure 5 As shown, the smart capacitor unit 32 includes: a first processor 321 , a main circuit 323 , a relay drive circuit 322 , a voltage conversion circuit 324 and a first communication circuit 325 .

[0106] Figure 4 and Figure 5 In the embodiment, the first end of the voltage conversion circuit 324 and the first end of the main circuit 323 are both electrically connected to the three-phase power grid 10, the first output end of the voltage conversion circuit 324 is electrically connected to the first end of the first processor 321, the second end of the first processor 321 is electrically connected to the first end of the relay drive circuit 322, the second end of the relay drive circuit 322 is electrically connected to the second end of the main circuit 323, the third end of the first processor 321 is electrically connected to the first end of the first communication circuit 325, and the second end of the first communication circuit 325 is electrically connected to the first end of the operation panel 31.

[0107] Figure 4 In the embodiment, for the voltage conversion circuit 324 in one of the smart capacitor units 32 , the voltage conversion circuit 324 includes a second output terminal, and the second output terminal is electrically connected to the second terminal of the operation panel 31 .

[0108] Figure 4and Figure 5 In the figure, the first end of the voltage conversion circuit 324 is recorded as 1, the first output end of the voltage conversion circuit 324 is recorded as 2, the second output end of the voltage conversion circuit 324 is recorded as 3, the first end of the first processor 321 is recorded as 1, the second end of the first processor 321 is recorded as 2, the third end of the first processor 321 is recorded as 3, the first end of the first communication circuit 325 is recorded as 1, the second end of the first communication circuit 325 is recorded as 2, the first end of the relay drive circuit 322 is recorded as 1, the second end of the relay drive circuit 322 is recorded as 2, the first end of the main circuit 323 is recorded as 1, and the second end of the main circuit 323 is recorded as 2.

[0109] The first processor 321 may be a single chip microcomputer or a microcontroller, and the first processor 321 may include a central processing unit, a memory, an input interface, and an output interface. The first processor 321 can receive the system voltage output by the voltage conversion circuit 324, and the first processor 321 can receive the first switching instruction output by the first communication circuit 325. The first processor 321 determines the switching drive instruction according to the first switching instruction, and outputs the switching drive instruction to the relay drive circuit 322. The switching drive instruction may include an input drive instruction and a removal drive instruction.

[0110] The relay driving circuit 322 can receive a switching driving instruction and output a switching driving signal to the main circuit 323 .

[0111] The main circuit 323 can receive the switching drive signal output by the relay drive circuit 322, and execute the first switching instruction of the intelligent capacitor unit 32 according to the switching drive signal. The switching drive signal can include an input drive signal and a cut-off drive signal.

[0112] The voltage conversion circuit 324 can obtain the system voltage of the three-phase power grid 10 and output the system voltage to the first processor 321 .

[0113] The first communication circuit 325 can send the current switching state of each smart capacitor unit to the operation panel 31, and receive the first switching instruction sent by the operation panel 31. The first communication circuit 325 can also receive the current switching state of each smart capacitor unit output by the first processor 321, and output the first switching instruction to the first processor 321.

[0114] For each smart capacitor unit 32, the voltage conversion circuit 324 obtains the system voltage of the three-phase power grid 10 and outputs the system voltage to the first processor 321. The first processor 321 determines the voltage zero crossing point based on the received system voltage analysis, and sends a switching drive instruction to the relay drive circuit 322 at the voltage zero crossing point.

[0115] For one of the smart capacitor units 32, the voltage conversion circuit 324 outputs the system voltage to the operation panel 31. The operation panel 31 analyzes the system voltage and determines to send a first switching instruction to the corresponding smart capacitor unit 32, thereby improving the power factor of the three-phase power grid 10 and the operation efficiency of the power grid.

[0116] The first communication circuit 325 receives the first switching instruction sent by the operation panel 31. When the first switching instruction received by the first communication circuit 325 in the corresponding intelligent capacitor unit 32 is to update the corresponding intelligent capacitor unit 32 to the input state, the first communication circuit 325 sends the first switching instruction representing the input state to the first processor 321 in the corresponding intelligent capacitor unit 32. When the first processor 321 receives the first switching instruction representing the input state, the first processor 321 outputs the input drive instruction to the relay drive circuit 322. When the relay drive circuit 322 receives the input drive instruction, the relay drive circuit 322 outputs the input drive signal to the main circuit 323, and the main circuit 323 performs the input operation of the intelligent capacitor unit 32 according to the input drive signal.

[0117] When the first switching instruction received by the first communication circuit 325 in the corresponding smart capacitor unit 32 is to update the corresponding smart capacitor unit 32 to a cut-off state, the first communication circuit 325 sends the first switching instruction representing the cut-off state to the first processor 321 in the corresponding smart capacitor unit 32. When the first processor 321 receives the first switching instruction representing the cut-off state, the first processor 321 outputs a cut-off drive instruction to the relay drive circuit 322. When the relay drive circuit 322 receives the cut-off drive instruction, the relay drive circuit 322 outputs a cut-off drive signal to the main circuit 323. The main circuit 323 performs the cut-off operation of the smart capacitor unit 32 according to the cut-off drive signal.

[0118] The operation panel 31 can receive the current switching status of each smart capacitor unit 32 sent by each smart capacitor unit 32 , and output a first switching instruction to the smart capacitor unit 32 .

[0119] Combine the following Figure 6 , the operation panel 31 proposed in this application is introduced in detail. Figure 6 A schematic diagram of the structure of an operating panel according to an embodiment of the present application.

[0120] like Figure 6 As shown, the operation panel 31 may include: a second processor 311 , a second communication circuit 313 and a current sampling circuit 312 .

[0121] The first end of the current sampling circuit 312 is electrically connected to the three-phase power grid 10, the second end of the current sampling circuit 312 is electrically connected to the first end of the second processor 311, the second end of the second processor 311 is electrically connected to the first end of the second communication circuit 313, the second end of the second communication circuit 313 is electrically connected to the first output end of each smart capacitor unit 32, and the second output end of one of the smart capacitor units 32 is electrically connected to the third end of the second processor 311.

[0122] Figure 6 In the figure, the first end of the second processor 311 is recorded as 1, the second end of the second processor 311 is recorded as 2, the third end of the second processor 311 is recorded as 3, the first end of the second communication circuit 313 is recorded as 1, the second end of the second communication circuit 313 is recorded as 2, the first end of the current sampling circuit 312 is recorded as 1, and the second end of the current sampling circuit 312 is recorded as 2.

[0123] The second processor 311 can receive and process the system current, the current switching state of each smart capacitor unit and the system voltage to obtain the first switching instruction. The second processor 311 outputs the first switching instruction to the second communication circuit 313 .

[0124] The second communication circuit 313 can receive the current switching state of each smart capacitor unit 32 sent by the smart capacitor unit 32, and send the current switching state of each smart capacitor unit to the second processor 311. The second communication circuit 313 can also receive the first switching instruction sent by the second processor 311, and send the first switching instruction to the corresponding smart capacitor unit 32.

[0125] The current sampling circuit 312 can sample the system current of the three-phase power grid 10 and output the system current to the second processor 311 .

[0126] The second processor 311 processes and analyzes the system current, the current switching state of each smart capacitor unit and the system voltage, and obtains the smart capacitor unit 32 that needs to be switched in or out. The second processor 311 outputs the first switching instruction to the second communication circuit 313 .

[0127] When the second processor 311 outputs the first switching instruction to the second communication circuit 313, the second communication circuit 313 sends the first switching instruction to the corresponding smart capacitor unit 32 whose switching status needs to be updated, thereby controlling the corresponding smart capacitor unit 32 to be connected to the three-phase power grid 10 or to be disconnected from the three-phase power grid 10.

[0128] During the operation of the capacitor device 30 , one or more intelligent capacitor units 32 and the operation panel 31 need to obtain a supply voltage.

[0129] Each of the one or more smart capacitor units 32 may include: a power conversion circuit.

[0130] The power supply end of the power conversion circuit is electrically connected to the three-phase power grid 10, and the output end of the power conversion circuit is electrically connected to the first processor, the relay drive circuit, the voltage conversion circuit and the first communication circuit respectively.

[0131] For the power conversion circuit in one of the smart capacitor units 32 , the output end of the power conversion circuit is also electrically connected to the second end of the operation panel 31 .

[0132] The power conversion circuit can convert the grid voltage of the three-phase grid 10 to obtain the supply voltage, and provide the supply voltage to the operation panel 31 and one or more smart capacitor units 32. For example, the power conversion circuit can convert the 220V voltage into a 5V supply voltage.

[0133] For each of the one or more smart capacitor units 32, the power conversion circuit provides a power supply voltage to other circuits in the smart capacitor unit 32. The other circuits in the smart capacitor unit 32 may include: a first processor 321, a first communication circuit 325, a relay drive circuit 322, and a main circuit 323.

[0134] For one of the smart capacitor units 32 , the power conversion circuit also provides a power supply voltage to the operation panel 31 . The power conversion circuit can provide a power supply voltage to the current sampling circuit 312 , the second communication circuit 313 and the second processor 311 in the operation panel 31 .

[0135] Therefore, the power conversion circuit can provide a supply voltage for one or more smart capacitor units 32 and the operation panel 31 .

[0136] Next, continue to combine Figure 7 , a third implementation method of the smart capacitor unit 32 is described in detail. Figure 7 This is a schematic diagram of the structure of the third smart capacitor unit according to an embodiment of the present application.

[0137] like Figure 7 As shown, the smart capacitor unit 32 may include: an indication circuit 326 .

[0138] The indication circuit 326 is electrically connected to the fourth terminal of the first processor 321 .

[0139] The indication circuit 326 can be arranged on the housing of each smart capacitor unit 32 or on the housing of the capacitor device 30. The indication circuit 326 can indicate the switching state of the smart capacitor unit 32. The indication circuit 326 can be an LED indication circuit. The switching state of the smart capacitor unit 32 can be distinguished by whether the LED indicator in the LED indication circuit is on or off.

[0140] When a smart capacitor unit 32 is in the on state, the LED indicator light corresponding to the smart capacitor unit 32 is on. When a smart capacitor unit 32 is cut off, the LED indicator light corresponding to the smart capacitor unit 32 is off.

[0141] In this way, the user can intuitively obtain whether the corresponding smart capacitor unit 32 is in the on-state or off-state through the LED indicator light on the housing of the smart capacitor unit 32 or the housing of the capacitor device 30 .

[0142] Below, Figure 8 Take 32 as an example to introduce the implementation of the main circuit 323. Figure 8 A schematic diagram of the circuit structure of a main circuit of an embodiment of the present application.

[0143] like Figure 8 As shown, the main circuit 323 may include: a plurality of circuit breakers, a plurality of magnetic latching relays, and a plurality of capacitor groups.

[0144] The first ends of multiple circuit breakers are electrically connected to the three-phase power grid 10, the second ends of multiple circuit breakers are electrically connected to the first ends of multiple magnetic latching relays, the second ends of multiple magnetic latching relays are electrically connected to multiple groups of capacitors, and the third ends of multiple magnetic latching relays are electrically connected to the second end of the relay drive circuit 322.

[0145] The circuit breaker can provide overload protection and short circuit protection for the main circuit 323 .

[0146] The magnetic latching relay can receive the switching drive signal output by the relay drive circuit 322, and control the intelligent capacitor unit 32 to be connected to the three-phase power grid 10 or to be disconnected from the three-phase power grid 10 according to the switching drive signal.

[0147] The number of capacitor groups depends on the reactive power compensation requirements of the three-phase power grid 10. The capacity of each capacitor in the multiple groups of capacitors can be set to different values. The multiple groups of capacitors can optimize the power factor of the power grid and realize reactive power compensation for the three-phase power grid 10.

[0148] The present application does not limit the circuit structure of the main circuit 323 , wherein the number of circuit breakers, the number of magnetic latching relays and the number of capacitor groups can be reasonably designed and configured according to the actual situation and requirements of the three-phase power grid 10 .

[0149] Figure 8 In the embodiment, the number of the multiple circuit breakers is 3, and the circuit breakers are respectively a first circuit breaker S1, a second circuit breaker S2, and a third circuit breaker S3. The number of the magnetic latching relays is 2, and the magnetic latching relays are respectively a first magnetic latching relay M1 and a second magnetic latching relay M2. The number of the capacitor groups is 3, and the capacitors are respectively a first capacitor C1, a second capacitor C2, and a third capacitor C3.

[0150] Next, combine Fig. 9 , describing another implementation of the operation panel 31. Fig. 9 A schematic diagram of the structure of another operating panel according to an embodiment of the present application.

[0151] like Fig. 9 As shown, the operation panel 31 may further include: a display circuit 314 .

[0152] The display circuit 314 is electrically connected to the fourth terminal of the second processor 311 .

[0153] The display circuit 314 may be a liquid crystal display (LCD) display circuit.

[0154] The display circuit 314 displays the current switching status of each smart capacitor unit 32 in the one or more smart capacitor units 32 .

[0155] The display circuit 314 can provide feedback and guidance to the user by displaying the current switching status of each smart capacitor unit of the smart capacitor unit 32, thereby ensuring the safe and stable operation of the capacitor device 30.

[0156] Next, continue to combine Fig. 9 , describing another implementation of the operation panel 31.

[0157] like Fig. 9 As shown, the operation panel 31 may further include: a key circuit 315 .

[0158] The key circuit 315 is electrically connected to the fifth terminal of the second processor 311 .

[0159] The key circuit 315 can be a button assembly or a display assembly. Taking the button assembly as an example, the key circuit 315 can include an "input" key and a "cut" key.

[0160] The key signal may indicate that a first smart capacitor unit among one or more smart capacitor units 32 is put into the three-phase power grid 10 and a second smart capacitor unit among one or more smart capacitor units 32 is removed from the three-phase power grid 10, or the key signal may indicate that a first smart capacitor unit among multiple smart capacitor units 32 is put into the three-phase power grid 10, or the key signal may indicate that a second smart capacitor unit among multiple smart capacitor units 32 is removed from the three-phase power grid 10. The first smart capacitor unit and the second smart capacitor unit may be any P smart capacitor units among the one or more smart capacitor units 32, and P may be any natural number.

[0161] The second processor may send a second switching instruction to the second communication circuit according to the key signal. After receiving the second switching instruction sent by the second processor, the second communication circuit sends the second switching instruction to the first smart capacitor unit among the one or more smart capacitor units.

[0162] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A capacitor device, characterized in that: The capacitor device is used to access a three-phase power grid, and the capacitor device includes: an operation panel and one or more intelligent capacitor units; The system end of the operation panel and the system end of one of the one or more smart capacitor units are electrically connected to the three-phase power grid respectively, the first output end of each of the one or more smart capacitor units is electrically connected to the first end of the operation panel respectively, and the second output end of one of the smart capacitor units is electrically connected to the second end of the operation panel; Each of the one or more smart capacitor units is used to send a current switching state of the smart capacitor unit to the operation panel; One of the intelligent capacitor units is used to determine the system voltage corresponding to the three-phase power grid and send the system voltage to the operation panel; The operation panel is used to determine the system current corresponding to the three-phase power grid; The operation panel is also used to send a first switching instruction to each smart capacitor unit in the one or more smart capacitor units according to the current switching state of each smart capacitor unit, the system voltage and the system current, wherein the first switching instruction is used to indicate the updated switching state of the corresponding smart capacitor unit.

2. The capacitor device according to claim 1, characterized in that The intelligent capacitor unit includes: a first processor, a main circuit, a relay drive circuit, a voltage conversion circuit and a first communication circuit; The first end of the voltage conversion circuit and the first end of the main circuit are both electrically connected to the three-phase power grid, the first output end of the voltage conversion circuit is electrically connected to the first end of the first processor, the second end of the first processor is electrically connected to the first end of the relay drive circuit, the second end of the relay drive circuit is electrically connected to the second end of the main circuit, the third end of the first processor is electrically connected to the first end of the first communication circuit, and the second end of the first communication circuit is electrically connected to the first end of the operation panel; With respect to the voltage conversion circuit in one of the smart capacitor units, the voltage conversion circuit includes a second output terminal, and the second output terminal is electrically connected to the second terminal of the operation panel; The voltage conversion circuit is used to determine the system voltage corresponding to the three-phase power grid and send the system voltage to the first processor; The first processor is used to send the current switching state of the smart capacitor unit to the first communication circuit according to the system voltage; The first communication circuit is used to send the current switching state of the smart capacitor unit to the operation panel; For one of the smart capacitor units, the voltage conversion circuit is further used to send the system voltage to the operation panel; The operation panel is specifically used to send the first switching instruction to the first communication circuit according to the current switching state of the intelligent capacitor unit and the system voltage; The first communication circuit is further used to send the first switching instruction to the first processor; The first processor is further configured to determine a switching drive instruction according to the first switching instruction, and send the switching drive instruction to the relay drive circuit; The relay drive circuit is used to send a switching drive signal to the main circuit according to the switching drive instruction, so that the intelligent capacitor unit corresponding to the main circuit is put into the three-phase power grid or cut off from the three-phase power grid.

3. The capacitor device according to claim 2, characterized in that The smart capacitor unit also includes: a power conversion circuit; The power supply end of the power conversion circuit is electrically connected to the three-phase power grid, and the output end of the power conversion circuit is electrically connected to the first processor, the relay drive circuit, the voltage conversion circuit and the first communication circuit respectively; For the power conversion circuit in one of the smart capacitor units, the output end of the power conversion circuit is also electrically connected to the second end of the operation panel; The power conversion circuit is used to provide power supply voltage to the relay drive circuit, the first processor and the first communication circuit respectively; For one of the smart capacitor units, the power conversion circuit is also used to provide the power supply voltage to the operation panel.

4. The capacitor device according to claim 2, characterized in that The smart capacitor unit further includes: an indication circuit; The indication circuit is electrically connected to the fourth terminal of the first processor; The indicating circuit is used to indicate the switching state of the intelligent capacitor unit.

5. The capacitor device according to claim 2, characterized in that The main circuit includes: a plurality of circuit breakers, a plurality of magnetic latching relays and a plurality of groups of capacitors; The first ends of the multiple circuit breakers are electrically connected to the three-phase power grid, the second ends of the multiple circuit breakers are electrically connected to the first ends of the multiple magnetic latching relays, the second ends of the multiple magnetic latching relays are electrically connected to the multiple groups of capacitors, and the third ends of the multiple magnetic latching relays are electrically connected to the second end of the relay drive circuit.

6. The capacitor device according to claim 1, characterized in that The operation panel includes: a second processor, a second communication circuit and a current sampling circuit; The first end of the current sampling circuit is electrically connected to the three-phase power grid, the second end of the current sampling circuit is electrically connected to the first end of the second processor, the second end of the second processor is electrically connected to the first end of the second communication circuit, the second end of the second communication circuit is electrically connected to the first output end of each of the smart capacitor units, and the second output end of one of the smart capacitor units is electrically connected to the third end of the second processor; The current sampling circuit is used to determine the system current corresponding to the three-phase power grid and send the system current to the second processor; a second communication circuit, used for receiving the current switching state of the smart capacitor unit and sending the current switching state of the smart capacitor unit to the second processor; The second processor is used to receive the system voltage sent by one of the smart capacitor units and send the system voltage to the second processor; The second processor is further configured to send the first switching instruction to the second communication circuit according to the system current, the system voltage and the current switching state of the smart capacitor unit; The second communication circuit is further used to send the first switching instruction to each of the intelligent capacitor units.

7. The capacitor device according to claim 6, characterized in that The operation panel also includes: a display circuit; The display circuit is electrically connected to the fourth terminal of the second processor; The display circuit is used to display the switching status of each smart capacitor unit.

8. The capacitor device according to claim 6, characterized in that The operation panel also includes: a key circuit; The key circuit is electrically connected to the fifth terminal of the second processor; The key circuit is used to send a key signal to the second processor after receiving a key operation of the user, wherein the key signal is used to instruct to put a first smart capacitor unit among the one or more smart capacitor units into a three-phase power grid and / or to remove a second smart capacitor unit among the one or more smart capacitor units from the three-phase power grid; The second processor is further configured to send a second switching instruction to the second communication circuit according to the key signal; The second communication circuit is further used to send the second switching instruction to the first smart capacitor unit among the one or more smart capacitor units.

9. The capacitor device according to claim 1, characterized in that The capacitor device further comprises: an interface circuit; The second output end of one of the intelligent capacitor units is electrically connected to the first end of the interface circuit, and the second end of the interface circuit is electrically connected to the second end of the operation panel.

10. A power supply grid system, characterized in that: include: A three-phase power grid, a power grid reading circuit, and a capacitor device as claimed in any one of claims 1 to 9; The output end of the operation panel is electrically connected to the power grid reading circuit; The operation panel is also used to transmit the current switching status of each smart capacitor unit, the system voltage and the system current to the power grid reading circuit.

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