CN220042610U - Dual-power distribution device - Google Patents
Dual-power distribution device Download PDFInfo
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- CN220042610U CN220042610U CN202321572450.9U CN202321572450U CN220042610U CN 220042610 U CN220042610 U CN 220042610U CN 202321572450 U CN202321572450 U CN 202321572450U CN 220042610 U CN220042610 U CN 220042610U
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- 230000002457 bidirectional effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
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Abstract
The utility model discloses a dual-power distribution device, and belongs to the technical field of low-voltage distribution. The double-power-supply power distribution device comprises a first incoming line connected with a first incoming line switch in series, a second incoming line connected with a second incoming line switch in series, a first bus, a second bus and a bus-bar switch, wherein one end of the first incoming line is connected with a first alternating-current power supply, the other end of the first incoming line is connected with the first bus, one end of the second incoming line is connected with a second alternating-current power supply, the other end of the second incoming line is connected with the second bus, and the first bus and the second bus are connected with each other through the bus-bar switch; the dual-power distribution device further comprises an electric energy regulating device which is used for extracting electric energy from the second incoming line to rectify and invert the electric energy and then injecting the electric energy into the first bus when overload or low-voltage crossing occurs on the first incoming line. Compared with the prior art, the utility model can reduce the times of load cutting and line switching and improve the continuity of load work in the system.
Description
Technical Field
The utility model discloses a dual-power distribution device, and belongs to the technical field of low-voltage distribution.
Background
In many industries in real life, such as electric power, post and telecommunications, petroleum, coal, metallurgy, railway and the like, a low-voltage power distribution system adopts a two-inlet-wire one-bus connection mode instead of a dual-power supply switching mode. The two lines of the two-line-in-one bus system are respectively provided with a section of bus, the bus-connected switch is opened at ordinary times, the two lines of the two-line-in-one bus system are closed, and the load and the bus are relatively independent. When a certain line of incoming line fails, automatic switching operation (i.e. automatic standby power switching) of the standby power supply is performed: the line inlet switch is opened, the bus connection switch is closed, and power supply continuity is achieved. When the fault is relieved, the system is restored to the original state that the two incoming lines are closed and the bus-tie switch is opened.
The two-incoming-line one-bus-connection power distribution scheme has the advantages that after one incoming line fails, the other electricity load cannot be influenced; and if a conventional dual power switch (ATS) switching scheme is used, all loads experience a brief power down event.
The limitation of the two-wire-bus approach is that each wire load is typically configured to be 75% of the rated power of each wire transformer. When the load of one line is overweight, partial load unloading is needed, which causes that part of the actual load in use has to be forced to be stopped, and inconvenience is brought to the actual application. In addition, in some emergency situations, for example, when a low voltage crossing occurs in one line, it is generally required to switch the load to another line, so that the power supply of the load is temporarily interrupted.
Disclosure of Invention
The utility model aims to overcome the defects of the existing two-wire one-bus-connection power distribution scheme, and provides a dual-power distribution device which can allocate electric energy between two wires according to the actual working state of loads in the two wires, so that the load cutting condition and the number of line switching times are reduced, and the continuity of load work in a system is greatly improved.
The technical scheme adopted by the utility model specifically solves the technical problems as follows:
the double-power-source power distribution device comprises a first incoming line connected with a first incoming line switch in series, a second incoming line connected with a second incoming line switch in series, a first bus, a second bus and a bus-bar switch, wherein one end of the first incoming line is connected with a first alternating-current power supply, the other end of the first incoming line is connected with the first bus, one end of the second incoming line is connected with the second alternating-current power supply, the other end of the second incoming line is connected with the second bus, and the first bus and the second bus are connected with each other through the bus-bar switch; the dual-power distribution device further comprises an electric energy regulating device which is used for extracting electric energy from the second incoming line to rectify and invert the electric energy and then injecting the electric energy into the first bus when overload or low-voltage crossing occurs on the first incoming line.
As one preferable scheme, the electric energy regulating device comprises a first rectifying circuit, a second rectifying circuit, an inverter circuit and a power supply selection switch, wherein the input ends of the first rectifying circuit and the second rectifying circuit are respectively connected with a first incoming line and a second incoming line, the output ends of the first rectifying circuit and the second rectifying circuit are simultaneously connected with the input end of the inverter circuit, and the output end of the inverter circuit can be selectively connected with a first bus or a second bus through the power supply selection switch.
Further preferably, the electric energy regulating device further comprises a first input switch connected in series between the input end of the first rectifying circuit and the first incoming line, and a second input switch connected in series between the input end of the second rectifying circuit and the second incoming line.
As another preferable scheme, the electric energy regulating device is a bidirectional converter connected in series between the first incoming line and the second incoming line.
Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:
according to the utility model, the electric energy regulating device is utilized, when one incoming line is in overload or low voltage ride through abnormality, the bus corresponding to the abnormal incoming line is extracted from the other incoming line, so that load removal caused by overload can be effectively reduced, the number of load outage times is reduced, the continuity of load work is improved, reactive support can be provided for one power supply when the low voltage ride through occurs, and the number of power supply switching times is reduced as much as possible.
Drawings
FIG. 1 is a schematic diagram of the present utility model;
FIG. 2 is a schematic circuit diagram of a first embodiment of the present utility model;
fig. 3 is a schematic circuit diagram of a second embodiment of the present utility model.
Description of the embodiments
Aiming at the defects of the existing two-wire one-bus distribution scheme, the utility model aims to solve the problems that an electric energy regulation device is additionally arranged in a two-wire one-bus distribution system, when one wire is overloaded or has low voltage ride through abnormality, electric energy is extracted from the other wire and injected into a bus corresponding to the abnormal wire, so that load cutting caused by overload is reduced, the number of times of load power failure is reduced, the continuity of load work is improved, reactive support can be provided for one power supply when the low voltage ride through occurs, and the number of times of power supply switching is reduced as much as possible.
The technical scheme adopted by the utility model specifically solves the technical problems as follows:
the double-power-source power distribution device comprises a first incoming line connected with a first incoming line switch in series, a second incoming line connected with a second incoming line switch in series, a first bus, a second bus and a bus-bar switch, wherein one end of the first incoming line is connected with a first alternating-current power supply, the other end of the first incoming line is connected with the first bus, one end of the second incoming line is connected with the second alternating-current power supply, the other end of the second incoming line is connected with the second bus, and the first bus and the second bus are connected with each other through the bus-bar switch; the dual-power distribution device further comprises an electric energy regulating device which is used for extracting electric energy from the second incoming line to rectify and invert the electric energy and then injecting the electric energy into the first bus when overload or low-voltage crossing occurs on the first incoming line.
As one preferable scheme, the electric energy regulating device comprises a first rectifying circuit, a second rectifying circuit, an inverter circuit and a power supply selection switch, wherein the input ends of the first rectifying circuit and the second rectifying circuit are respectively connected with a first incoming line and a second incoming line, the output ends of the first rectifying circuit and the second rectifying circuit are simultaneously connected with the input end of the inverter circuit, and the output end of the inverter circuit can be selectively connected with a first bus or a second bus through the power supply selection switch.
Further preferably, the electric energy regulating device further comprises a first input switch connected in series between the input end of the first rectifying circuit and the first incoming line, and a second input switch connected in series between the input end of the second rectifying circuit and the second incoming line.
As another preferable scheme, the electric energy regulating device is a bidirectional converter connected in series between the first incoming line and the second incoming line.
The technical scheme of the utility model is described in detail below by combining the accompanying drawings:
the basic structure of the dual-power distribution device is shown in figure 1, and the dual-power distribution device comprises an I-section inlet wire connected with an inlet wire switch QF1 in series, a II-section inlet wire connected with an inlet wire switch QF2 in series (wherein the I-section inlet wire and the II-section inlet wire can be the first inlet wire and the second inlet wire) and an I-section bus, a II-section bus and a bus-bar switch QF3, one end of the I-section inlet wire is connected with an alternating-current power supply SI, the other end of the I-section inlet wire is connected with the I-section bus, one end of the II-section inlet wire is connected with an alternating-current power supply SII, the other end of the II-section inlet wire is connected with the II-section bus, and the I-section bus and the II-section bus are mutually connected through the bus-bar switch QF 3; the control unit is used for inputting voltage U to two paths of power supplies SI 、U SII And input current I SI 、I SII And detecting and controlling the controllable components in the system according to the detection result. In addition, as shown in fig. 1, the dual-power distribution device further comprises an electric energy regulation device, and the electric energy regulation device is used for extracting electric energy from the section II wire to rectify and invert when overload or low voltage ride through occurs on the section I wire, and then injecting the electric energy into the section I bus, and extracting electric energy from the section I wire to rectify and invert when overload or low voltage ride through occurs on the section II wire.
For the convenience of public understanding, the following two embodiments are used to further describe the technical scheme of the present utility model:
the circuit structure principle of the first embodiment is shown in fig. 2, wherein the electric energy regulating device comprises a rectifying circuit AC/DC1, a rectifying circuit AC/DC2, an inverter circuit DC/AC and a power supply selection switch S k The method comprises the steps of carrying out a first treatment on the surface of the The input ends of the rectifying circuit AC/DC1 and the rectifying circuit AC/DC2 are respectively connected with an I-section inlet wire and an II-section inlet wire, the output ends of the AC/DC1 and the AC/DC2 are simultaneously connected with the input end of the inverter circuit DC/AC, and the output end of the inverter circuit DC/AC is connected with the input end of the inverter circuit DC/AC through the power supply selection switch S k Can be selectively connected with the I section bus or the II section bus. In the embodiment, the rectification circuits AC/DC1 and AC/DC2 are uncontrollable rectification circuits, so that an input switch K1 and an input switch K2 are respectively connected in series between the rectification circuits AC/DC1 and the I-section incoming line and between the rectification circuits AC/DC2 and the II-section incoming line; if the rectification circuit AC/DC1 and the rectification circuit AC/DC2 adopt controllable rectification circuits, an input switch K1 and an input switch K2 are not required to be arranged.
During normal operation, the busbar switch QF3 is opened, the wire inlet switch QF1 and the wire inlet switch QF2 are closed (the wire inlet switch QF1 and the wire inlet switch QF2 are preferably circuit breakers), and the inverter circuit DC/AC does not output. The loads at all levels corresponding to the I-section bus are powered by a power supply SI, and the loads at all levels corresponding to the II-section bus are powered by a power supply SII. When the load on the section I bus or the section II bus is overloaded at a certain moment, the conventional solution is to cut off part of the three-level load so that the system does not operate in an overload state.
When the scheme is adopted, the control unit can detect that overload or low voltage crossing occurs on a certain section of incoming line (for example, the known input voltage U according to two paths of power supplies SI 、U SII And input current I SI 、I SII And detecting), and extracting electric energy from the normal incoming line through the electric energy regulating device to inject the electric energy into the bus corresponding to the abnormal incoming line. The specific electric energy regulation and control process is as follows:
when overload on the segment I bus is detected (e.g., sampled current I SI Exceeding a preset value), will select switch S k Switching to the I section bus, and simultaneously controlling the output of the inverter circuit; at this time, the electric energy regulating device provides the electric energy exceeding part for the I section bus by the power supply SII, thereby avoiding the cutting of the I section load.
When overload on the segment II bus is detected (e.g., sampled current I SII Exceeding a preset value), will select switch S k Switching to the section II bus, and simultaneously controlling the output of the inverter circuit; at this time, the electric energy regulating device provides the electric energy of the excess part for the section II bus by the power supply SI, thereby avoiding the cutting of the section II load.
Another case is: when one power supply SI experiences low voltage ride through (for example, the sampled voltage value is lower than a preset value), the electric energy regulating device can also provide reactive current support for SI from the other power supply SII, so as to avoid switching operation of the first switch QF1 and the bus-tie switch QF 3.
When a low voltage crossing occurs in one line (e.g. sampled voltage value U SI Or U (U) SII Lower than a preset value), the electric energy regulating device can also extract electric energy from another power supply to provide reactive current support for one line of incoming wires with low voltage ride through, so that switching operation of the incoming wire switches QF1 and QF2 and the bus-bar switch QF3 is avoided.
The circuit structure principle of the second specific embodiment is shown in fig. 3, wherein the electric energy regulating device is a bidirectional converter connected in series between an I-section incoming line and an II-section incoming line and is formed by connecting two converters in series; when the power supply SI is input, the left converter is controlled to be in a PWM rectification mode, alternating current of the SI is rectified to direct current, the right converter is controlled to be in an inversion mode, and the direct current is converted into alternating current through an inversion circuit to supply power to the SII side; when the power source SII is input, the bridge circuit on the right is controlled to be in a PWM rectification mode, alternating current of the SII is rectified to direct current, the converter on the left is controlled to be in an inversion mode, and the direct current is converted into alternating current through the inversion circuit to supply power to the SI side. The embodiment has the advantages that the control mode is very flexible, the circuit is completely symmetrical, the bidirectional energy supply can be conveniently realized, and the switching is not required by using a power supply selection switch.
When the scheme is adopted, the control unit can detect that overload or low voltage crossing occurs on a certain section of incoming line (for example, the known input voltage U according to two paths of power supplies SI 、U SII And input current I SI 、I SII To perform the detection),and extracting electric energy from the normal incoming line through the electric energy regulating device, and injecting the electric energy into a bus corresponding to the abnormal incoming line. The specific electric energy regulation and control process is as follows:
when overload on segment I is detected (e.g. sampled current I SI Exceeding a preset value), the electric energy regulating device controls the left bridge circuit to work in a PWM rectification mode, the alternating current at the power supply SI side is rectified into direct current, the direct current voltage is used as the input of the right bridge circuit after passing through the bus capacitors C1 and C2, and the right bridge circuit is controlled to work in an inversion mode; at this time, the electric energy regulating device provides excess electric energy for the section II bus by the power supply SI, thereby avoiding the excision of the section II load.
When overload on the segment II bus is detected (e.g., sampled current I SII Exceeding a preset value), the electric energy regulating device controls the right bridge circuit to work in a PWM rectification mode, the alternating current at the SII side of the power supply is rectified into direct current, the direct current voltage is used as the input of the left bridge circuit after passing through the bus capacitors C1 and C2, and the left bridge circuit is controlled to work in an inversion mode; at this time, the electric energy regulating device provides excess electric energy for the I-section bus by the power supply SII, thereby avoiding the excision of the I-section load.
Another case is: when the power supply SII has low voltage ride through, the electric energy regulating device can also provide reactive current support for the SII from the other power supply SI, so that switching operation of the incoming line switch QF2 and the bus-bar breaker QF3 is avoided; when the power supply SI has low voltage ride through, the electric energy regulating device can also provide reactive current support for SI from another power supply SII, so that switching operation of the incoming line switch QF1 and the bus switch QF3 is avoided.
Claims (4)
1. The double-power-source power distribution device comprises a first incoming line connected with a first incoming line switch in series, a second incoming line connected with a second incoming line switch in series, a first bus, a second bus and a bus-bar switch, wherein one end of the first incoming line is connected with a first alternating-current power supply, the other end of the first incoming line is connected with the first bus, one end of the second incoming line is connected with the second alternating-current power supply, the other end of the second incoming line is connected with the second bus, and the first bus and the second bus are connected with each other through the bus-bar switch; the double-power-supply power distribution device is characterized by further comprising an electric energy regulating device which is used for extracting electric energy from the second incoming line for rectification and inversion when overload or low-voltage crossing occurs on the first incoming line, and then injecting the electric energy into the first bus.
2. The dual-power distribution device according to claim 1, wherein the power regulation device comprises a first rectifying circuit, a second rectifying circuit, an inverter circuit and a power selection switch, wherein the input ends of the first rectifying circuit and the second rectifying circuit are respectively connected with a first incoming line and a second incoming line, the output ends of the first rectifying circuit and the second rectifying circuit are simultaneously connected with the input end of the inverter circuit, and the output end of the inverter circuit can be selectively connected with the first bus or the second bus through the power selection switch.
3. The dual power distribution device of claim 2, wherein the power conditioning device further comprises a first input switch coupled in series between the input of the first rectifying circuit and the first incoming line, and a second input switch coupled in series between the input of the second rectifying circuit and the second incoming line.
4. The dual source power distribution device of claim 1 wherein the power conditioning device is a bi-directional current transformer connected in series between the first and second wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321572450.9U CN220042610U (en) | 2023-06-20 | 2023-06-20 | Dual-power distribution device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321572450.9U CN220042610U (en) | 2023-06-20 | 2023-06-20 | Dual-power distribution device |
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| Publication Number | Publication Date |
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| CN220042610U true CN220042610U (en) | 2023-11-17 |
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| CN202321572450.9U Active CN220042610U (en) | 2023-06-20 | 2023-06-20 | Dual-power distribution device |
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| CN (1) | CN220042610U (en) |
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