CN106451471B - Short-circuit control method and short-circuit control device for power supply device - Google Patents
Short-circuit control method and short-circuit control device for power supply device Download PDFInfo
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- CN106451471B CN106451471B CN201510497277.4A CN201510497277A CN106451471B CN 106451471 B CN106451471 B CN 106451471B CN 201510497277 A CN201510497277 A CN 201510497277A CN 106451471 B CN106451471 B CN 106451471B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
- H02J2310/58—The condition being electrical
- H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The invention relates to the field of power electronics, and provides a short-circuit control method and a short-circuit control device of a power supply device. The short circuit control method comprises the following steps: 11) controlling the inverter to be out of operation; 12) cutting off the load with the lowest power supply grade in the current loads; 13) controlling the inverter to work; 14) when the output voltage of the inverter is not equal to zero, controlling the inverter to work; when the output voltage of the inverter is equal to zero, controlling the inverter to be out of operation, excluding the load with the lowest power supply level from the current loads, and then repeating the steps 12) -14) until the number of the current loads is equal to 1. The short circuit control method of the invention supplies power to the load which has the highest power supply grade and does not generate short circuit to the maximum extent.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a control method and a control device of a power supply device.
Background
The output of the power supply is usually connected to a plurality of parallel loads. According to the national standard 'design specification of power supply and distribution systems', the load is sequentially reduced according to the power supply grade and divided into three grades of primary, secondary and tertiary loads. In the process that the power supply device supplies power to the parallel loads, the power supply device should ensure that the loads with high power supply grade are supplied with power as far as possible.
An Uninterruptible Power Supply (UPS) has become a very important power supply device because it can continuously supply power to a load. Fig. 1 shows a circuit diagram of a prior art UPS with a parallel load connected to its output. In which only the inverter 12 in the UPS 11 is shown as a block in order to simplify the circuit diagram of fig. 1. As shown in fig. 1, the first-stage load 13, the second-stage load 14, and the third-stage load 15 are connected in series with fuses 23, 24, and 25, respectively, and then connected in parallel to the output terminal of the inverter 12. In the process that the inverter 12 supplies power to the first-stage load 13, the second-stage load 14 and the third-stage load 15 which are connected in parallel, if any one of the parallel loads is short-circuited, the inverter 12 is controlled to output short-circuit fault clearing current to automatically clear the short circuit.
Fig. 2 is a timing chart of the output voltage Vo and the output current Io obtained based on the conventional short circuit auto-clear. As shown in fig. 2, at time t0-t1, the parallel load is not short-circuited, and the output voltage Vo and the output current Io are both sine waves; at time t1, when the parallel load is short-circuited and the output voltage Vo is 0 (regardless of the impedance of the lead), the inverter 12 is controlled to output a short-circuit clearing current (having a waveform of a square wave with a current value larger than the normal output current) which flows into the load branch in which the short-circuit occurs, thereby blowing the fuse 23, 24 or 25 in the branch; after the load in which the short circuit occurs is disconnected at time t2, the output voltage Vo and the output current Io return to sine waves.
Fig. 3 is another timing diagram of the output voltage and output current based on the existing short circuit auto-clearing. It differs from fig. 2 in that the inverter 12 is controlled to output the short circuit clearing current at time t1-t3, and at time t3, the short circuit clearing current does not cut off the short circuit, i.e., the short circuit automatic clearing fails. At this time, since the inverter 12 is controlled to stop supplying power to the parallel load, the output voltage Vo and the output current Io both become 0 after the time t 3.
After the short circuit is automatically cleared and fails, the conventional short circuit control method is to stop supplying power to all parallel loads. However, when a short circuit occurs in a load with a low power supply level among the parallel loads and a short circuit does not occur in a load with a high power supply level, the conventional short circuit control method cannot supply power to a load with a high power supply level. Therefore, a short circuit control method is needed to meet the requirement of supplying power to the load with the highest power supply level to the maximum extent.
Disclosure of Invention
In view of the above technical problems of the existing control method after the short circuit automatic clearing failure, an embodiment of the present invention provides a short circuit control method after the short circuit automatic clearing failure of a power supply apparatus, where the power supply apparatus includes an inverter and a plurality of loads connected in parallel to an output end of the inverter, and the plurality of loads have different power supply levels and serve as current loads, and the short circuit control method includes the following steps:
11) controlling the inverter to be out of operation;
12) cutting off the load with the lowest power supply grade in the current loads;
13) controlling the inverter to work;
14) when the output voltage of the inverter is not equal to zero, controlling the inverter to work;
when the output voltage of the inverter is equal to zero, controlling the inverter to be out of operation, excluding the load with the lowest power supply level from the current loads, and then repeating the steps 12) -14) until the number of the current loads is equal to 1.
Preferably, the plurality of loads include a first load and a second load whose power supply levels are sequentially reduced, and the second load is disconnected in step 12).
Preferably, the plurality of loads include a first load, a second load, and a third load, of which power supply levels are sequentially reduced, and the third load is disconnected in the step 12); in the step 14), when the output voltage of the inverter is not equal to zero, controlling the inverter to operate.
Preferably, in the step 14), when the output voltage of the inverter is equal to zero, the inverter is controlled not to operate, and the following steps are sequentially performed:
141) cutting off the second load;
142) controlling the inverter to work;
143) when the output voltage of the inverter is not equal to zero, controlling the inverter to work;
and when the output voltage of the inverter is equal to zero, controlling the inverter to be out of operation.
An embodiment of the present invention also provides a short-circuit control apparatus for implementing the above-mentioned short-circuit control method, wherein the power supply apparatus includes an inverter and a plurality of loads connected in parallel to an output terminal of the inverter, the plurality of loads having different power supply levels and serving as current loads, and the short-circuit control apparatus includes: the inverter control device is used for controlling the inverter to work or not work; the load cutting device is used for cutting off the load with the lowest power supply grade in the current loads; wherein the inverter control device is further used for controlling the inverter to work when the output voltage of the inverter is not equal to zero, and controlling the inverter to not work when the output voltage of the inverter is equal to zero.
Preferably, the load cut-off device further includes a load short-circuit determination device for excluding the load with the lowest power supply level from the current load when the output voltage of the inverter is equal to zero.
Another embodiment of the present invention provides a short-circuit control method for a power supply apparatus, the power supply apparatus including an inverter and a plurality of loads connected in parallel to an output terminal of the inverter, the plurality of loads having N power supply levels, N being a positive integer greater than 1, the short-circuit control method including the steps of: 21) measuring the current in the load of N-1 power supply grades except the highest power supply grade in the short circuit automatic clearing process; 22) after the short circuit automatic clearing is failed, when the current in the loads of the N-1 power supply levels is equal to zero, controlling the inverter to be out of work; when the currents in the loads of the N-1 power supply levels are not all equal to zero, sequentially executing the following steps: 221) controlling the inverter to be out of operation; 222) cutting off a load with a current not equal to zero; 223) and controlling the inverter to work.
Preferably, the plurality of loads include a first load and a second load whose power supply levels are sequentially reduced, and in the step 21), the current in the second load is measured; in the step 222), the second load is cut off.
Preferably, the plurality of loads include a first load, a second load and a third load whose power supply levels are sequentially reduced, and in the step 21), the currents in the second load and the third load are measured; in step 22), when the current in the second load and/or the current in the third load is not equal to zero, the second load and/or the third load is switched off in step 222).
Another embodiment of the present invention provides a short-circuit control apparatus for implementing the short-circuit control method, wherein the power supply apparatus includes an inverter and a plurality of loads connected in parallel to an output terminal of the inverter, the plurality of loads having N power supply levels, N being a positive integer greater than 1, and the short-circuit control apparatus includes:
the current measuring device is used for measuring the current in the loads of N-1 power supply grades except the highest power supply grade in the short circuit automatic clearing process;
the inverter control device is used for controlling the inverter to be out of work when the current in the loads of the N-1 power supply levels is equal to zero after the short circuit automatic clearing failure; and when the current in the loads of the N-1 power supply levels is not all equal to zero, controlling the inverter to work or not work.
The short circuit control method can meet the requirement of supplying power to the load with the highest power supply grade to the greatest extent after the short circuit automatic clearing fails.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings, in which:
fig. 1 is a circuit diagram of a conventional UPS having a parallel load connected to its output terminals.
Fig. 2 is a timing diagram of an output voltage and an output current based on a conventional short circuit auto-clearing.
Fig. 3 is another timing diagram of the output voltage and output current based on the existing short circuit auto-clearing.
Fig. 4 is a circuit diagram of two supply class loads connected to the output of a UPS.
Fig. 5 is a flowchart for controlling the power supply circuit shown in fig. 4 according to a first short circuit control method of the present invention.
Fig. 6 and 7 are timing charts of the output voltage and the output current obtained according to the flowchart shown in fig. 5.
Fig. 8 is a circuit diagram of three power class loads connected to the output of the UPS.
Fig. 9 is a flowchart for controlling the power supply circuit shown in fig. 8 according to a first short circuit control method of the present invention.
Fig. 10 is a flowchart for controlling the power supply circuit shown in fig. 4 according to a second short circuit control method of the present invention.
Fig. 11 and 12 are timing charts of the output voltage and the output current obtained according to the short-circuit control method shown in fig. 10.
Fig. 13 is a flowchart for controlling the power supply circuit shown in fig. 8 according to a second short circuit control method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by embodiments with reference to the accompanying drawings.
The following description will be made in detail with respect to a case where parallel loads of two power supply classes (i.e., a first load having a high power supply class and a second load having a low power supply class) and three power supply classes (i.e., a first load, a second load, and a third load having sequentially decreasing power supply classes) are connected to the output terminal of the UPS, respectively. It should be appreciated that the short circuit control method described below is based on the case of a short circuit auto-purge failure.
Fig. 4 is a circuit diagram of two supply class loads connected to the output of a UPS. As shown in fig. 4, the first load 100 and the fuse 101 are connected in series to the output terminal of the inverter 12 of the UPS 11, and the second load 200, the fuse 201 and the switch 202 are connected in series to the output terminal of the inverter 12. Wherein the first load 100 has a higher power level than the second load 200.
Fig. 5 is a flowchart for controlling the power supply circuit shown in fig. 4 according to a first short circuit control method of the present invention. Fig. 6 and 7 are timing charts of the output voltage and the output current obtained according to the flowchart shown in fig. 5. As shown in fig. 6 and 7, at the time t0-t3, the waveforms of the output voltage Vo and the output current Io are identical to those of the output voltage Vo and the output current Io in fig. 3 at the time t0-t3 (i.e., short circuit self-clearing failure), and will not be described again. As shown in fig. 5-7, after the short circuit automatic clearing failure, the following control processes are performed in sequence: step S11 is executed at time t3, the inverter 12 is controlled not to operate, and therefore the output voltage Vo and the output current Io in fig. 6 and 7 are zero; step S12 is executed at time t4, and the switch 202 on the branch of the second load 200 is controlled to be opened, so that the output voltage Vo and the output current Io in fig. 6 and 7 are still zero; step S13 is executed at time t5 to control the operation of the inverter 12; step S14 is executed after time t5, and the operating state of the inverter 12 is controlled according to the measured output voltage Vo. Wherein in step S14, if the output voltage Vo ≠ 0, indicating that the second load 200 is short-circuited and the short-circuit is cut off, the inverter 12 is kept (or controlled) to operate to continue supplying power to the first load 100, so that the output voltage Vo and the output current Io are restored to sine waves after time t5 (see fig. 6); if the output voltage Vo is 0 (see fig. 7), indicating that the first load 100 is short-circuited, the inverter 12 is controlled not to operate and stop supplying power.
Fig. 8 is a circuit diagram of three power class loads connected to the output of the UPS. It is substantially the same as fig. 4 except that it further includes a third load 300, a fuse 301, and a switch 302 connected in series to the output terminal of the inverter 12.
Fig. 9 is a flowchart for controlling the power supply circuit shown in fig. 8 according to a first short circuit control method of the present invention. As shown in fig. 9, when the short circuit automatic clearing fails, the following control processes are sequentially performed: step S11', controlling the inverter 12 not to operate; step S12', controlling the switch 302 in the branch of the third load 300 to open; step S13', controlling the inverter 12 to operate; step S14' controls the operating state of the inverter 12 based on the measured output voltage Vo. Wherein in step S14', if the output voltage Vo ≠ 0, indicating that the third load 300 is short-circuited and the short-circuit is cut off, the inverter 12 is kept (or controlled) to operate, thereby supplying power to the first load 100 and the second load 200; if the output voltage Vo is 0, indicating that the short circuit is not cut, steps S11, S12, S13, and S14 shown in fig. 5 are sequentially performed.
The control method of the present invention is not limited to control of two power supply class loads or three power supply class loads, and may also control more than three power supply class loads. Wherein a plurality of loads connected in parallel have different power supply levels and are used as the current loads. The short circuit control method comprises the following steps:
11) controlling the inverter to stop working;
12) controlling a switch on a load branch with the lowest power supply grade in the current load to be switched off;
13) controlling the inverter to work;
14) and controlling the working state of the inverter according to the measured output voltage of the inverter.
In step 14), when the output voltage of the inverter is not equal to zero (indicating that no short circuit occurs in the current load), controlling the inverter to work; when the output voltage of the inverter is equal to zero (indicating that a short circuit still exists in the current load), the inverter is controlled not to work, the load with the lowest power supply level is excluded from the current load, and the steps 12-14) are repeated until the number of the current loads is equal to 1.
The short circuit control method can realize that: and controlling the inverter to stop supplying power when the load with the highest power supply level is short-circuited, otherwise controlling the inverter to work so as to supply power to the load with the highest power supply level, so that the load without the short-circuit and with the highest power supply level is supplied with power to the maximum extent.
According to an embodiment of the present invention, there is also provided a short-circuit control apparatus that implements the above-described short-circuit control method, the power supply apparatus including an inverter and a parallel load connected to an output terminal of the inverter, the parallel load including a plurality of power supply class loads as a current load, the short-circuit control apparatus including:
the inverter control device is used for controlling the inverter to work or not work;
the load cutting device is used for cutting off the load with the lowest power supply grade in the current loads;
wherein the inverter control device is further used for controlling the working state of the inverter according to the measured output voltage of the inverter.
In a preferred embodiment, the inverter control device is configured to control the inverter to operate when the output voltage of the inverter is not equal to zero; and the inverter is controlled not to work when the output voltage of the inverter is equal to zero.
In another preferred embodiment, the load cut-off device further includes a load short-circuit determination device for excluding the load with the lowest power supply level from the present loads when the output voltage of the inverter is equal to zero.
Fig. 10 is a flowchart for controlling the power supply circuit shown in fig. 4 according to a second short circuit control method of the present invention. Fig. 11 and 12 are timing charts of the output voltage and the output current obtained according to the short-circuit control method shown in fig. 10. As shown in fig. 11 and 12, at the time t0-t3, the waveforms of the output voltage Vo and the output current Io are identical to those of the output voltage Vo and the output current Io in fig. 3 at the time t0-t3 (i.e., short circuit self-clearing failure), and will not be described again. As shown in fig. 10 to 12, the following control processes are sequentially performed: executing step S21 at time t1-t3 (short circuit automatic clearing process), measuring a current I2 in the second load 200; step S22 is executed after time t3, the operating state of the inverter 12 is controlled in accordance with the measured current I2; in step S22, if the current I2 ≠ 0, which indicates that the second load 200 is short-circuited due to the short-circuit, step S221 is sequentially executed at times t3, t4, and t5 to control the inverter 12 not to operate; step S222, controlling the switch 202 on the branch of the second load 200 to be turned off; in step S223, the inverter 12 is controlled to operate, so that the output voltage Vo and the output current Io are restored to sine waves after time t5 (see fig. 11). If the current I2 is 0, indicating that the second load 200 is not short-circuited, it is determined that the first load 100 is short-circuited, and the inverter 12 is controlled not to operate and stop supplying power, so that the output voltage Vo and the output current Io become zero after the time t3 (see fig. 12).
Fig. 13 is a flowchart for controlling the power supply circuit shown in fig. 8 according to a second short circuit control method of the present invention. As shown in fig. 13, the following control processes are sequentially performed: step S21', during the short circuit auto-clearing process, measuring the current I2 in the second load 200 and the current I3 in the third load 300; step S22', the operating state of the inverter 12 is controlled according to the measured currents I2, I3. Wherein in step S22 ', if the current I2 ≠ 0 and/or I3 ≠ 0, which indicates that the second load 200 and/or the third load 300 is short-circuited, step S221' is sequentially executed to control the inverter 12 not to operate; step S222 ', controlling the switch 202 on the branch of the second load 200 and/or the switch 302 on the branch of the third load 300 to be turned off, and step S223', controlling the inverter 12 to work; if the current I2 is equal to 0 and the current I3 is equal to 0, it indicates that the first load 100 with the highest power supply level is short-circuited, and the inverter 12 is controlled not to operate and stop supplying power.
The control method of the present invention is not limited to control of two power supply class loads or three power supply class loads, and may also control more than three power supply class loads. Assuming that a plurality of loads connected in parallel have N power supply levels, N being a positive integer greater than 1, the short circuit control method of the present invention comprises the steps of:
21) measuring the current in the load of N-1 power supply grades except the highest power supply grade in the short circuit automatic clearing process;
22) after the short circuit automatic clearing is failed, when the current in the loads of the N-1 power supply levels is equal to zero, controlling the inverter to be out of work; when the currents in the loads of the N-1 power supply levels are not all equal to zero, sequentially executing the following steps: 221) controlling the inverter to be out of operation; 222) cutting off a load with a current not equal to zero; 223) and controlling the inverter to work.
The above-described embodiments of the present invention do not limit the specific values of the t3-t4 period and the t4-t5 period in fig. 6, 7 and 11. It is known to those skilled in the art that it is sufficient to make it as short as possible in the actual control process.
According to another embodiment of the present invention, there is also provided a short circuit control apparatus for implementing the above short circuit control method, the power supply apparatus including an inverter and a parallel load connected to an output terminal of the inverter, the parallel load including N loads of different power supply classes, N being a positive integer greater than 1, the short circuit control apparatus including:
the current measuring device is used for measuring the current in N-1 power supply grade loads except the highest power supply grade in the short circuit automatic clearing process;
the inverter control device is used for controlling the inverter to be out of work when the current in the loads of the N-1 power supply levels is equal to zero after the short circuit automatic clearing failure; and when the current in the loads of the N-1 power supply levels is not all equal to zero, controlling the inverter to work or not work.
Although the present invention has been described by way of preferred embodiments, the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the present invention.
Claims (10)
1. A short circuit control method for a power supply device after a short circuit automatic clearing failure, the power supply device comprising an inverter and a plurality of loads connected in parallel at an output end of the inverter, the plurality of loads having different power supply levels and being current loads, the short circuit control method comprising the steps of:
11) controlling the inverter to be out of operation;
12) cutting off the load with the lowest power supply grade in the current loads;
13) controlling the inverter to work;
14) when the output voltage of the inverter is not equal to zero, controlling the inverter to work;
when the output voltage of the inverter is equal to zero, controlling the inverter to be out of operation, excluding the load with the lowest power supply level from the current loads, and then repeating the steps 12) -14) until the number of the current loads is equal to 1.
2. The short-circuit control method according to claim 1, wherein the plurality of loads include a first load and a second load whose power supply levels are sequentially reduced, and wherein in the step 12), the second load is cut off.
3. The short-circuit control method according to claim 1, wherein the plurality of loads include a first load, a second load, and a third load whose power supply levels are sequentially reduced,
in the step 12), the third load is cut off;
in the step 14), when the output voltage of the inverter is not equal to zero, controlling the inverter to operate.
4. The short-circuit control method according to claim 3, wherein in the step 14), when the output voltage of the inverter is equal to zero, the inverter is controlled not to operate, and the following steps are sequentially performed:
141) cutting off the second load;
142) controlling the inverter to work;
143) when the output voltage of the inverter is not equal to zero, controlling the inverter to work;
and when the output voltage of the inverter is equal to zero, controlling the inverter to be out of operation.
5. A short-circuit control apparatus for implementing the short-circuit control method according to any one of claims 1 to 4, the power supply apparatus including an inverter and a plurality of loads connected in parallel to an output terminal of the inverter, the plurality of loads having different power supply levels and being current loads, the short-circuit control apparatus comprising:
the inverter control device is used for controlling the inverter to work or not work;
the load cutting device is used for cutting off the load with the lowest power supply grade in the current loads;
wherein the inverter control device is further used for controlling the inverter to work when the output voltage of the inverter is not equal to zero, and controlling the inverter to not work when the output voltage of the inverter is equal to zero.
6. The short-circuit control device according to claim 5, wherein the load cut-off device further comprises a load short-circuit determination device for excluding the load of which the power supply level is lowest from the present loads when the output voltage of the inverter is equal to zero.
7. A short-circuit control method for a power supply apparatus including an inverter and a plurality of loads connected in parallel to an output terminal of the inverter, the plurality of loads having N power supply levels, N being a positive integer greater than 1, the short-circuit control method comprising the steps of:
21) measuring the current in the load of N-1 power supply grades except the highest power supply grade in the short circuit automatic clearing process;
22) after the short circuit automatic clearing is failed, when the current in the loads of the N-1 power supply levels is equal to zero, controlling the inverter to be out of work; when the currents in the loads of the N-1 power supply levels are not all equal to zero, sequentially executing the following steps: 221) controlling the inverter to be out of operation; 222) cutting off a load with a current not equal to zero; 223) and controlling the inverter to work.
8. The short-circuit control method according to claim 7, wherein the plurality of loads include a first load and a second load whose power supply levels are sequentially reduced,
in said step 21), measuring the current in said second load;
in the step 222), the second load is cut off.
9. The short-circuit control method according to claim 7, wherein the plurality of loads include a first load, a second load, and a third load whose power supply levels are sequentially reduced,
in said step 21), measuring the current in said second and third loads;
in step 22), when the current in the second load and/or the current in the third load is not equal to zero, the second load and/or the third load is switched off in step 222).
10. A short-circuit control apparatus for implementing the short-circuit control method according to any one of claims 7 to 9, the power supply apparatus including an inverter and a plurality of loads connected in parallel to an output terminal of the inverter, the plurality of loads having N power supply levels, N being a positive integer greater than 1, the short-circuit control apparatus comprising:
the current measuring device is used for measuring the current in the loads of N-1 power supply grades except the highest power supply grade in the short circuit automatic clearing process;
the inverter control device is used for controlling the inverter to be out of work when the current in the loads of the N-1 power supply levels is equal to zero after the short circuit automatic clearing failure; and when the current in the loads of the N-1 power supply levels is not all equal to zero, controlling the inverter to work or not work.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510497277.4A CN106451471B (en) | 2015-08-13 | 2015-08-13 | Short-circuit control method and short-circuit control device for power supply device |
| PCT/CN2016/093245 WO2017024983A1 (en) | 2015-08-13 | 2016-08-04 | Short circuit control method and device for power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510497277.4A CN106451471B (en) | 2015-08-13 | 2015-08-13 | Short-circuit control method and short-circuit control device for power supply device |
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| US8514531B1 (en) * | 2012-03-14 | 2013-08-20 | Eaton Corporation | Trip unit providing short circuit zone location detection, electrical switching apparatus and system including the same |
| CN203645324U (en) * | 2013-11-28 | 2014-06-11 | 西安奥赛福科技有限公司 | Multi-DC feeder line microgrid control system |
| CN103840530B (en) * | 2014-03-20 | 2016-06-08 | 成都市智合微电子有限公司 | The single-chip intelligent power that the multichannel independence current limliting of bringing onto load state-detection exports |
| CN104242269B (en) * | 2014-09-12 | 2018-01-23 | 华为技术有限公司 | Distribution system and electric power system |
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| FR2696885B1 (en) * | 1992-10-09 | 1994-12-09 | Alcatel Espace | Decentralized power supply system comprising at least one common AC bus. |
| CN2271769Y (en) * | 1995-12-18 | 1997-12-31 | 系统电子工业股份有限公司 | Active inverter of uninterruptible power equipment |
| US6262903B1 (en) * | 1998-12-24 | 2001-07-17 | Denso Corporation | Direct-current power supply circuit having control sections with at least one control section having priority over another control section |
| CN100382409C (en) * | 2003-03-31 | 2008-04-16 | 富士电机控股株式会社 | Non-power cutting power supply system |
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Also Published As
| Publication number | Publication date |
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| CN106451471A (en) | 2017-02-22 |
| WO2017024983A1 (en) | 2017-02-16 |
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