CN112886563A - Flexible interconnection switch device for low-voltage direct-current power distribution - Google Patents
Flexible interconnection switch device for low-voltage direct-current power distribution Download PDFInfo
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- CN112886563A CN112886563A CN202110020015.4A CN202110020015A CN112886563A CN 112886563 A CN112886563 A CN 112886563A CN 202110020015 A CN202110020015 A CN 202110020015A CN 112886563 A CN112886563 A CN 112886563A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/08—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a flexible interconnection switch device for low-voltage direct-current power distribution, which comprises a voltage U connected with a direct-current power distribution area1The first dual buck/boost module is connected with the first voltage-stabilizing capacitor C in parallel1And further comprises connecting the voltage U of the DC distribution region2The second dual buck/boost module is connected with a second voltage-stabilizing capacitor C in parallel2An inductance component is connected between the first dual buck/boost type module and the second dual buck/boost type module, and the direct current distribution region voltage U1Negative pole and DC distribution area voltage U2The negative electrodes are connected; for effecting power transmission between low-voltage DC distribution areasThe flexible interconnection device replaces a traditional interconnection switch to carry out energy dispatching and mutual aid among power distribution areas, realizes emergency power support and transfer from heavy load to light load, and improves the reliability and flexibility of the low-voltage direct-current power distribution network.
Description
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to a flexible interconnection switching device for low-voltage direct-current power distribution.
Background
The low-voltage direct-current power distribution network can locally absorb the distributed new energy, avoids multi-stage power conversion of the traditional alternating-current power distribution network, and has the potential advantages of high maximum transmission power, low line loss, high electric energy quality and the like. At present, low-voltage direct-current power distribution is applied to large-scale data centers, commercial buildings and industrial parks, and provides reliable and efficient power supply for novel direct-current loads such as electric automobiles, 5G base stations and direct-current household appliances.
For the connection of adjacent low-voltage direct-current distribution areas of a low-voltage direct-current distribution network, a mechanical switch is mostly adopted for energy scheduling and mutual assistance among the distribution areas, but the mechanical switch has limited action times and short service life, and meanwhile, the switching operation of the mechanical switch can cause the problems of power supply interruption, loop closing impact and the like.
Disclosure of Invention
The invention aims to provide a flexible interconnection switching device for low-voltage direct-current power distribution, which realizes interconnection and mutual aid and optimized operation of low-voltage direct-current power distribution networks in two areas, and thus improves the power supply reliability of the direct-current power distribution areas.
The invention adopts the technical scheme that the flexible interconnection switch device for low-voltage direct-current power distribution comprises a voltage U connected with a direct-current power distribution area1The first dual buck/boost module is connected with the first voltage-stabilizing capacitor C in parallel1And further comprises connecting the voltage U of the DC distribution region2The second dual buck/boost module is connected with a second voltage-stabilizing capacitor C in parallel2A first dual buck/boost module and a second dual buckAn inductance component and a direct current distribution region voltage U are connected between the voltage/voltage boosting type modules1Negative pole and DC distribution area voltage U2Are connected with each other.
The invention is also characterized in that:
the first dual buck/boost module includes a drain connected DC distribution region voltage U1Positive first full-control type power switch tube Q1First full-control power switch tube Q1Are respectively connected with a first diode D1Cathode and first voltage-stabilizing capacitor C1One end of the first full-control type power switch tube Q1Is connected to a second diode D2The first diode D1Anode of the first full-control type power switch tube Q2A second diode D2Anode and first voltage-stabilizing capacitor C1The other end of the first full-control type power switch tube Q2The source electrodes are all connected with the voltage U of the direct current distribution area1Negative electrode, first diode D1Anode of and the first full-control type power switch tube Q1The source electrodes of the first and second transistors are connected with the inductance component.
The second dual buck/boost module includes a drain connected DC distribution region voltage U2Third full-control type power switch tube Q of anode3Third full-control power switch tube Q3The drain electrodes of the first and second diodes are also respectively connected with a third diode D3Cathode and second voltage-stabilizing capacitor C2One end of the third full-control type power switch tube Q3Is connected with a fourth diode D4Cathode of (2), third diode D3The anode is connected with a fourth full-control type power switch tube Q4The fourth full-control type power switch tube Q4Source electrode of, fourth diode D4Anode of, a second voltage-stabilizing capacitor C2The other ends of the two ends of the three-phase transformer are connected with a direct current distribution area voltage U2Negative pole of (2), third diode D3Anode of (2), fourth diode D4The cathodes of the two capacitors are all connected with an inductance component.
The inductance component comprises a first full-control power switch tube Q1Source electrode of and third diode D3First inductance L between the anodes1And further comprising a diode D connected to the first diode1Anode of and a fourth diode D4Between the cathodes of the first and second inductors L2。
First inductance L1And a second inductor L2The connection mode between the two is one of non-coupling, forward coupling and reverse coupling.
First full-control power switch tube Q1And a second full-control power switch tube Q2And the third full-control power switch tube Q3And the fourth full-control power switch tube Q4Are all metal-oxide semiconductor field effect transistors.
The flexible interconnection switch device for low-voltage direct-current power distribution has the beneficial effects that:
1) the flexible interconnection device for realizing power transmission between low-voltage direct-current power distribution areas replaces a traditional interconnection switch to carry out energy scheduling and mutual aid between power distribution areas, realizes emergency power support and transfer from heavy load to light load, and improves the reliability and flexibility of a low-voltage direct-current power distribution network.
2) Compared with a switching device of a traditional bridge arm with two active switching tubes, the device for realizing flexible interconnection between low-voltage direct-current power distribution areas can avoid the direct-current side short circuit problem caused by direct connection, does not need to set dead time, and has high reliability;
3) the metal-oxide semiconductor field effect transistor is used for realizing the flexible interconnection device between the low-voltage direct-current power distribution areas, the switching tubes are metal-oxide semiconductor field effect transistors, the metal-oxide semiconductor field effect transistors are easy to be connected in parallel for use when the device transmits high power, the conduction loss of the switching tubes is low, and the metal-oxide semiconductor field effect transistors can improve the switching speed of the device and improve the working efficiency.
Drawings
FIG. 1(a) shows a topology diagram of a dual buck/boost circuit based on uncoupled inductors;
FIG. 1(b) shows a topology diagram of a dual buck/boost circuit based on forward coupled inductors;
FIG. 1(c) shows a topology diagram of a dual buck/boost circuit based on reverse coupled inductors;
FIG. 2 shows the inductance L of a dual buck/boost circuit based on different inductances1The simulated current waveform of (1);
fig. 3 shows a schematic diagram of the application of the flexible interconnection switching device based on the topology structure in a low-voltage direct-current power distribution network;
fig. 4 shows a modulation strategy diagram of a flexible interconnection switching device based on the topology.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The power distribution network adopting the flexible direct current interconnection technology can realize emergency power support and the transfer of heavy load to light load, and the power supply capacity can be fully exerted.
The invention relates to a flexible interconnection switch device for low-voltage direct-current power distribution, which comprises a voltage U connected with a direct-current power distribution area1The first dual buck/boost module is connected with the first voltage-stabilizing capacitor C in parallel1And further comprises connecting the voltage U of the DC distribution region2The second dual buck/boost module is connected with a second voltage-stabilizing capacitor C in parallel2An inductance component is connected between the first dual buck/boost type module and the second dual buck/boost type module, and the direct current distribution region voltage U1Negative pole and DC distribution area voltage U2Are connected with each other.
The first dual buck/boost module includes a drain connected DC distribution region voltage U1Positive first full-control type power switch tube Q1First full-control power switch tube Q1Are respectively connected with a first diode D1Cathode and first voltage-stabilizing capacitor C1One end of the first full-control type power switch tube Q1Is connected to a second diode D2The first diode D1Anode of the first full-control type power switch tube Q2A second diode D2Anode and first voltage-stabilizing capacitor C1The other end of the first full-control type power switch tube Q2The source electrodes are all connected with direct current distributionArea voltage U1Negative electrode, first diode D1Anode of and the first full-control type power switch tube Q1The source electrodes of the first and second transistors are connected with the inductance component.
The second dual buck/boost module includes a drain connected DC distribution region voltage U2Third full-control type power switch tube Q of anode3Third full-control power switch tube Q3The drain electrodes of the first and second diodes are also respectively connected with a third diode D3Cathode and second voltage-stabilizing capacitor C2One end of the third full-control type power switch tube Q3Is connected with a fourth diode D4Cathode of (2), third diode D3The anode is connected with a fourth full-control type power switch tube Q4The fourth full-control type power switch tube Q4Source electrode of, fourth diode D4Anode of, a second voltage-stabilizing capacitor C2The other ends of the two ends of the three-phase transformer are connected with a direct current distribution area voltage U2Negative pole of (2), third diode D3Anode of (2), fourth diode D4The cathodes of the two capacitors are all connected with an inductance component.
The inductance component comprises a first full-control power switch tube Q1Source electrode of and third diode D3First inductance L between the anodes1And further comprising a diode D connected to the first diode1Anode of and a fourth diode D4Between the cathodes of the first and second inductors L2。
First inductance L1And a second inductor L2The connection mode between the two is one of non-coupling, forward coupling and reverse coupling.
First full-control power switch tube Q1And a second full-control power switch tube Q2And the third full-control power switch tube Q3And the fourth full-control power switch tube Q4Are all metal-oxide semiconductor field effect transistors.
Examples
In a flexible interconnection switching device for low voltage DC power distribution, a first inductor L1And a second inductor L2The applications to the three coupling modes are as follows:
1) uncoupled, as shown in FIG. 1(a), L1＝L2＝1mH。
2) Forward coupling, as shown in FIG. 1(b), L1＝L2＝1mH，M＝0.5mH。
3) Reverse coupling, L as shown in FIG. 1(c)1＝L2＝1mH，M＝0.5mH。
The flowing first inductor L corresponding to the 3 connection modes1The current ripple of the two inductors is the minimum current ripple of the reverse coupling inductor, so that the conduction loss and the cost of the flexible interconnection device can be reduced.
The flexible interconnection switching device for low-voltage direct-current power distribution can be used in the occasion of flexible interconnection of a plurality of adjacent low-voltage direct-current power distribution areas as shown in figure 3, so that energy scheduling and mutual aid between the adjacent areas are realized, and customized power requirements such as distributed power supply consumption, high power supply reliability and the like are met. As shown in fig. 3, taking a flexible interconnection switchgear between a distribution i zone and a distribution ii zone as an example, the switchgear mainly includes two parts: topology and modulation strategy.
The topological structure realizes flexible interconnection of two adjacent low-voltage direct-current power distribution areas and adjusts voltage and power transmission or fault isolation of the power distribution areas on two sides.
And the modulation strategy is used for outputting modulation signals according to the load conditions of the power distribution areas on the two sides of the device and controlling the on-off of a switching tube in the topological structure so as to enable the device to work in different modes.
The working mode of the device specifically comprises: in the first interconnection mode, if the power shortage occurs in the power distribution area II, the power distribution area I can provide power support for the power distribution area II through the switching device; in the second interconnection mode, if the power shortage occurs in the power distribution I area, the power distribution II area can provide power support for the power distribution I area through the switching device; and in a locking mode, if a current conversion device connected with a load in a power distribution area on one side of the switching device fails, 4 fully-controlled power switching tubes in the switching device are locked. In the single-ended voltage support mode, if a converter device connected with an alternating current power grid in a power distribution area on one side of a switch device fails, the direct current bus voltage control of the failed power distribution area can be supported by the converter device in the adjacent power distribution area through the switch device.
Fig. 4 shows a schematic diagram of the modulation strategy, where the modulation range is 0 to 2- Δ d, and the modulation range includes three modulation cells, a first cell is 0 to 1- Δ d, a second cell is 1- Δ d to 1, and a third cell is 1 to 2- Δ d.
As shown in fig. 4, the duty ratio d is compared with the carrier 1 to obtain a modulation signal of the first fully-controlled power switch Q1, the duty ratio d is compared with the carrier 2 to obtain a modulation signal of the fourth fully-controlled power switch Q4, the modulation signal of the second fully-controlled power switch Q2 is complementary to the modulation signal of the first fully-controlled power switch Q1, and the modulation signal of the third fully-controlled power switch Q3 is complementary to the modulation signal of the fourth fully-controlled power switch Q4.
When the duty ratio d is in a first cell interval, the first full-control type power switch tube Q1Modulation, second full-control type power switch tube Q2Modulation, third full-control type power switch tube Q3Conducting, fourth full-control type power switch tube Q4And (3) turning off, namely, the numerical relation of the direct-current bus voltage of the power distribution areas at two sides of the device is as follows:
U2＝dU1 (1)
when the duty ratio d is in a second cell interval, the first full-control type power switch tube Q1Modulation, second full-control type power switch tube Q2Modulation, third full-control type power switch tube Q3Modulation, fourth control type power switch tube Q4Modulation, numerical relationship of the dc bus voltage of the distribution areas on both sides of the device:
when the duty ratio d is in a third cell interval, the first full-control type power switch tube Q1Conducting, second full-control type power switch tube Q2Turn-off, third full-control type power switch tube Q3Modulation, fourth full-control type power switch tube Q4Modulation, numerical relationship of the dc bus voltage of the distribution areas on both sides of the device:
the device gives a duty ratio d according to the load conditions of the distribution I area and the distribution II area, the voltage of the distribution areas on two sides is regulated through formulas (1) to (3), and the working mode of the device is selected according to the modulation interval where the duty ratio d is located.
According to the flexible interconnection switch device for low-voltage direct-current power distribution, adjacent areas of a low-voltage direct-current power distribution network are connected through the flexible direct-current interconnection switch, compared with a traditional interconnection switch, the flexible direct-current interconnection switch is mainly composed of fully-controlled power electronic devices, is not limited by the times of actions of a traditional mechanical switch, is longer in service life, can adjust power flowing between two power distribution areas in real time within the self capacity adjusting range, can avoid the problem of power supply interruption caused by switching operation of the traditional interconnection switch, and ensures safe and stable operation of the power distribution network.
Claims (6)
1. A flexible interconnection switch device for low-voltage direct-current power distribution is characterized by comprising a voltage U connected with a direct-current power distribution area1The first dual buck/boost module is connected with the first voltage stabilizing capacitor C in parallel1And further comprises connecting the voltage U of the DC distribution region2The second dual buck/boost module is connected with a second voltage stabilizing capacitor C in parallel2An inductance assembly is connected between the first dual buck/boost module and the second dual buck/boost module, and the direct current distribution area voltage U1Negative pole and DC distribution area voltage U2Are connected with each other.
2. The flexible interconnection switching device for low voltage dc power distribution of claim 1, wherein the first dual buck/boost module comprises a drain connected dc distribution area voltage U1Positive first full-control type power switch tube Q1The first full-control type power switch tube Q1Are respectively connected with a first diode D1Cathode and first voltage-stabilizing capacitor C1One end of the first full-control type power switch tube Q1Is connected to a second diode D2The first diode D1Anode of the first full-control type power switch tube Q2The drain electrode of the second diode D2Anode and first voltage-stabilizing capacitor C1The other end of the first full-control type power switch tube Q2The source electrodes are all connected with the voltage U of the direct current distribution area1Negative electrode, the first diode D1Anode of and the first full-control type power switch tube Q1The source electrodes of the first and second transistors are connected with the inductance component.
3. The flexible interconnection switching device for low voltage dc power distribution as claimed in claim 2, wherein the second dual buck/boost module comprises a drain connected dc distribution area voltage U2Third full-control type power switch tube Q of anode3And the third full-control type power switch tube Q3The drain electrodes of the first and second diodes are also respectively connected with a third diode D3Cathode and second voltage-stabilizing capacitor C2One end of the third full-control type power switch tube Q3Is connected with a fourth diode D4The third diode D3The anode is connected with a fourth full-control type power switch tube Q4The fourth full-control type power switch tube Q4Source electrode of, fourth diode D4Anode of, a second voltage-stabilizing capacitor C2The other ends of the two ends of the three-phase transformer are connected with a direct current distribution area voltage U2The negative pole of (1), the third diode D3Anode of (2), fourth diode D4The cathodes of the two capacitors are all connected with an inductance component.
4. The flexible interconnection switching device for low voltage dc power distribution according to claim 3, wherein the inductance assembly comprises a first fully-controlled power switch Q1Source electrode of and third diode D3First inductance L between the anodes1And further comprising a diode D connected to the first diode1And an anode ofFourth diode D4Between the cathodes of the first and second inductors L2。
5. Flexible interconnection switching device for low-voltage DC power distribution according to claim 4, characterized in that the first inductance L1And a second inductor L2The connection mode between the two is one of non-coupling, forward coupling and reverse coupling.
6. The flexible interconnection switching device for low voltage DC power distribution as claimed in claim 3, wherein the first fully-controlled power switch Q1And a second full-control power switch tube Q2And the third full-control power switch tube Q3And the fourth full-control power switch tube Q4Are all metal-oxide semiconductor field effect transistors.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114069587A (en) * | 2021-10-18 | 2022-02-18 | 太原理工大学 | Control method for flexible interconnection between direct-current micro-grids |
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