CN221150969U - Rectifying circuit system with switchable common direct current bus and single bus operation - Google Patents
Rectifying circuit system with switchable common direct current bus and single bus operation Download PDFInfo
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- CN221150969U CN221150969U CN202323093839.8U CN202323093839U CN221150969U CN 221150969 U CN221150969 U CN 221150969U CN 202323093839 U CN202323093839 U CN 202323093839U CN 221150969 U CN221150969 U CN 221150969U
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- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The utility model discloses a rectifying circuit system with switchable public direct current buses and single bus operation, which comprises two direct current buses, two rectifying units and three isolating switches; the three-phase alternating current power supply is connected with an alternating current input end of the transformer, a first direct current output end of the transformer is connected with the first rectifying unit through a first line, the first rectifying unit is connected with the first rectifying control unit and is controlled, and the output end of the first rectifying unit is connected with the first direct current bus through a first isolating switch; the second direct current output end of the transformer is connected with a second rectifying unit through a second circuit, the second rectifying unit is connected with and controlled by a second rectifying control unit, and the output end of the second rectifying unit is connected with a second direct current bus through a second isolating switch; the first direct current bus and the second direct current bus are connected through a third isolating switch. When any one side of the two single-side rectifying systems fails or the two single-side rectifying systems explodes, the bus can be quickly switched to the other side to continue running, and the loss caused by the failure can be greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of direct current bus power supply circuits, and particularly relates to a rectifying circuit system with switchable operation of a public direct current bus and a single bus.
Background
The direct current bus is mainly applied to a multi-motor transmission system and used for controlling the high precision of a speed regulation system, is most suitable for proportional linkage of a plurality of controls and can drive a three-phase permanent magnet synchronous motor. The basic principle of power supply to the load is that three-phase alternating current is converted into direct current through a transformer and a rectifying unit and is supplied to a direct current bus, a plurality of inverter units are mounted on the direct current bus, and then the direct current power supply supplied by the direct current bus is inverted into alternating current power supply with frequency required by the load by the inverter units. During operation, the rectifying unit may malfunction or blow down, thereby causing the dc bus system to fail.
Disclosure of utility model
The utility model aims to solve the defects of the prior art, and provides a rectifying circuit system with switchable operation of a public direct current bus and a single bus. When any one side of the two single-side rectifying systems fails or the two single-side rectifying systems explodes, the bus can be quickly switched to the other side to continue running, and the loss caused by the failure can be greatly reduced.
The utility model is realized by the following technical scheme:
A rectifying circuit system with switchable common DC bus and single bus operation comprises two DC buses, two rectifying units and three isolating switches;
The three-phase alternating current power supply is connected with an alternating current input end of a transformer through a circuit breaker and a fuse, a first direct current output end of the transformer is connected with a first rectifying unit through a first circuit, the first rectifying unit is connected with a first rectifying control unit and is controlled, and the output end of the first rectifying unit is connected with a first direct current bus DC1 through a first isolating switch K1; the second direct current output end of the transformer is connected with a second rectifying unit through a second circuit, the second rectifying unit is connected with and controlled by a second rectifying control unit, and the output end of the second rectifying unit is connected with a second direct current bus DC2 through a second isolating switch K2; the first direct current bus DC1 and the second direct current bus DC2 are connected through a third isolating switch K3.
In the technical scheme, the transformer adopts a three-winding transformer, the secondary side voltages are the same, and the angle difference is 30 degrees.
In the above technical solution, the first DC bus DC1 and the second DC bus DC2 are respectively mounted with an inverter unit, an ac output end of the inverter unit is connected to a load, and the DC power supplied by the DC bus is inverted into an ac power with a frequency required by the load by the inverter unit.
In the above technical scheme, a first inductor L1 is disposed on a first line connected to a first dc output end of the transformer, and a second inductor L2 is disposed on a second line connected to a second dc output end of the transformer, so as to perform a dc filtering function, and the filtered dc power source enters the rectifying unit again.
The utility model has the advantages and beneficial effects that:
According to the utility model, the isolating switch is added on the direct current rectifying sides of the two direct current buses, so that the direct current sides can be rapidly segmented. An isolating switch is added between the two direct current buses, so that the two buses can be connected in parallel quickly. The rectification units of the two direct current buses are respectively provided with a control unit, and each rectification unit is provided with two sets of control parameters which can be used in parallel or independently.
The utility model can rapidly realize the switching between the single bus and the public direct current bus, and greatly reduces the failure rate and the maintenance time. When any one side of the two single-side rectifying systems fails or the two single-side rectifying systems explodes, the bus can be quickly switched to the other side to continue running, and the loss caused by the failure can be greatly reduced.
Drawings
Fig. 1 is a circuit diagram of the common dc bus and single bus operation switchable rectifier circuitry of the present utility model.
Fig. 2 is a control logic diagram of the present utility model.
Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.
Detailed Description
In order to make the person skilled in the art better understand the solution of the present utility model, the following describes the solution of the present utility model with reference to specific embodiments.
A common direct current bus and single bus operation switchable rectification circuit system, see figure 1, comprises two direct current buses (DC 1 and DC 2), two rectification units and three isolating switches (K1, K2 and K3).
The three-phase alternating current power supply AC is connected with an alternating current input end of a transformer T through a breaker and a fuse, a three-winding transformer is adopted by the transformer T, the voltages of the secondary sides are the same, and the angle difference is 30 degrees; the first direct current output end of the transformer T is connected with a first rectifying unit through a first line, the first rectifying unit is connected with and controlled by a first rectifying control unit, and the output end of the first rectifying unit is connected with a first direct current bus DC1 through a first isolating switch K1; the second direct current output end of the transformer T is connected with a second rectifying unit through a second circuit, the second rectifying unit is connected with and controlled by a second rectifying control unit, and the output end of the second rectifying unit is connected with a second direct current bus DC2 through a second isolating switch K2; the first direct current bus DC1 and the second direct current bus DC2 are connected through a third isolating switch K3.
The first DC bus DC1 and the second DC bus DC2 are respectively mounted with inverter units (the number of the inverter units is determined according to actual requirements), the ac output ends of the inverter units are connected with a load, and the DC power supplied by the DC buses is inverted into an ac power with a frequency required by the load by the inverter units.
Further, a first inductor L1 is arranged on a first line connected with a first direct current output end of the transformer T, a second inductor L2 is arranged on a second line connected with a second direct current output end of the transformer T, a direct current filtering effect is achieved, and a filtered direct current power supply enters the rectifying unit again.
Under the comprehensive action of three isolating switches K1, K2 and K3, the system has the following three working modes:
Mode 1: the two rectifying units are in parallel operation, and the two direct current buses are in parallel connection to form a common direct current bus operation mode. In this mode, all three disconnectors K1, K2, K3 are closed. The two rectification control units simultaneously control the corresponding rectification units to work.
Mode 2: the two rectifying units are independently operated, and the two direct current buses are separated to form a single bus operation mode. In this mode, the first disconnecting switch K1 and the second disconnecting switch K2 are engaged, and the third disconnecting switch K3 is opened. At this time, the rectification units can be independently operated, so that the two rectification systems are completely independent.
Mode 3: one rectifying unit operates, the other rectifying unit stops, and the two direct current buses are connected in parallel. In this mode, only one of the first isolation switch K1 or the second isolation switch K2 is engaged, the third isolation switch K3 is engaged, and when the first rectifying unit is operated, K1 is engaged, and K3 is engaged; when the second rectifying unit operates, K2 is attracted, and K3 is attracted.
Fig. 2 is a logic diagram of a control mode of the rectifying unit, which can realize free switching of the three working modes. After the system is started, the operation mode can be selected. Under the condition that the system works in the mode 1 and the mode 2, when any rectifying unit fails, the system can be quickly switched to the mode 3 to continue to work.
The foregoing has described exemplary embodiments of the utility model, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the utility model may be made by those skilled in the art without departing from the spirit of the utility model.
Claims (4)
1. The utility model provides a public direct current busbar and single busbar operation switchable rectification circuit system which characterized in that: the device comprises two direct current buses, two rectifying units and three isolating switches;
The three-phase alternating current power supply is connected with an alternating current input end of a transformer through a circuit breaker and a fuse, a first direct current output end of the transformer is connected with a first rectifying unit through a first circuit, the first rectifying unit is connected with a first rectifying control unit, and an output end of the first rectifying unit is connected with a first direct current bus DC1 through a first isolating switch K1; the second direct current output end of the transformer is connected with a second rectifying unit through a second circuit, the second rectifying unit is connected with a second rectifying control unit, and the output end of the second rectifying unit is connected with a second direct current bus DC2 through a second isolating switch K2; the first direct current bus DC1 and the second direct current bus DC2 are connected through a third isolating switch K3.
2. The common dc bus and single bus operation switchable rectifier circuitry of claim 1, wherein: the transformer adopts a three-winding transformer, the secondary side voltages are the same, and the angle difference is 30 degrees.
3. The common dc bus and single bus operation switchable rectifier circuitry of claim 1, wherein: the first direct current bus DC1 and the second direct current bus DC2 are respectively provided with an inverter unit, and an alternating current output end of the inverter unit is connected with a load.
4. The common dc bus and single bus operation switchable rectifier circuitry of claim 1, wherein: a first inductor L1 is arranged on a first line connected with a first direct current output end of the transformer, and a second inductor L2 is arranged on a second line connected with a second direct current output end of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323093839.8U CN221150969U (en) | 2023-11-15 | 2023-11-15 | Rectifying circuit system with switchable common direct current bus and single bus operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323093839.8U CN221150969U (en) | 2023-11-15 | 2023-11-15 | Rectifying circuit system with switchable common direct current bus and single bus operation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221150969U true CN221150969U (en) | 2024-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323093839.8U Active CN221150969U (en) | 2023-11-15 | 2023-11-15 | Rectifying circuit system with switchable common direct current bus and single bus operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221150969U (en) |
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2023
- 2023-11-15 CN CN202323093839.8U patent/CN221150969U/en active Active
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