CN112821389A - Double-bus power supply-based loop closing system and method - Google Patents
Double-bus power supply-based loop closing system and method Download PDFInfo
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- CN112821389A CN112821389A CN202110069541.XA CN202110069541A CN112821389A CN 112821389 A CN112821389 A CN 112821389A CN 202110069541 A CN202110069541 A CN 202110069541A CN 112821389 A CN112821389 A CN 112821389A
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
Abstract
The invention discloses a double-bus power supply-based loop closing system and a loop closing method, wherein the loop closing method comprises the following steps: when the control unit receives a control instruction for starting a loop closing operation, the control unit acquires a first output voltage amplitude of the first switch S1 and a second output voltage amplitude of the second switch S2; when a first phase of the first output voltage amplitude is consistent with a second phase of the second output voltage amplitude, the control unit adjusts the working states of the first anti-fluctuation unit and the second anti-fluctuation unit according to the voltage of the first output voltage amplitude and the voltage of the second output voltage amplitude, so that the voltage of the first output voltage amplitude is close to the voltage of the second output voltage amplitude, and when the voltage difference between the first output voltage amplitude and the second output voltage amplitude is smaller than or equal to the difference percentage preset in the control unit, the control unit outputs a loop closing signal; the loop closing method disclosed by the application can avoid overlarge circulation generated in the loop closing process, so that the safety degree of the loop closing operation is improved.
Description
Technical Field
The invention relates to the technical field of power distribution of a power distribution network, in particular to a double-bus power supply-based loop closing system and a double-bus power supply-based loop closing method.
Background
The switching action between the two power supplies of the transmission is generally completed by directly and manually closing a loop closing switch by a worker; for example, suppose the dual power supply includes a T1 line and a T2 line, the T1 line includes a first switch, the T2 line includes a second switch, and the loop-closing switch is disposed between the first switch and the second switch; when the circuit needs to be switched from the T2 circuit to the T1 circuit, a worker manually closes the loop closing switch and opens the second switch, and all loads are borne by the T1 circuit; however, the manual closing mode of the staff is directly adopted, and the phase relation and the voltage amplitude relation between the two power supplies before the loop closing operation are not considered, so that the loop closing short circuit phenomenon is easy to occur, and the power supply is easy to break down.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a loop closing method of a loop closing system based on a double-bus power supply system, which can avoid generating an overlarge loop current in the loop closing process, thereby improving the safety of the loop closing operation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a loop closing method of a loop closing system based on double-bus power supply comprises a first power supply unit and a second power supply unit for supplying power to a load, a first anti-fluctuation unit for processing electric energy output by the first power supply unit, a second anti-fluctuation unit for processing electric energy output by the second power supply unit, a control unit and a loop closing switch S3, wherein the first power supply unit comprises a first switch S1, and the first anti-fluctuation unit comprises a first detection unit for detecting the amplitude of output voltage of a first switch S1; the second power supply unit comprises a second switch S2, the second anti-ripple unit comprises a second detection unit for detecting a 2-output voltage amplitude of the second switch S, two ends of the loop closing switch S3 are respectively connected with a first switch S1 and a second switch S2, and the first switch S1, the second switch S2, the loop closing switch S3, the first detection unit and the second detection unit are respectively electrically connected with the control unit, and the loop closing method comprises the steps of:
when the control unit receives a control instruction for starting a loop closing operation, the control unit acquires a first output voltage amplitude of the first switch S1 fed back by the first detection unit and acquires a second output voltage amplitude of the second switch S2 fed back by the second detection unit;
the control unit acquires a first phase according to the first output voltage amplitude and acquires a second phase according to the second output voltage amplitude;
when the first phase is consistent with the second phase, the control unit adjusts the working states of the first anti-fluctuation unit and the second anti-fluctuation unit according to the voltage of the amplitude of the first output voltage and the voltage of the amplitude of the second output voltage, so that the voltage of the amplitude of the first output voltage is close to the voltage of the amplitude of the second output voltage;
when the difference between the voltage value of the first output voltage amplitude and the voltage value of the second output voltage amplitude is smaller than or equal to the difference percentage preset in the control unit, the control unit outputs a loop closing signal.
In the loop closing method of the loop closing system based on the double-bus power supply, the control unit obtains a first phase according to a first output voltage amplitude and obtains a second phase according to a second output voltage amplitude, and the method specifically includes the following steps:
the control unit acquires a first phase according to the phase angle and the phase sequence of the amplitude of the first output voltage, and acquires a second phase according to the phase angle and the phase sequence of the amplitude of the second output voltage.
In the loop closing method of the loop closing system based on the double-bus power supply, the first anti-fluctuation unit comprises a first AC/DC module and a first AC/AC module, the second anti-fluctuation unit comprises a second AC/DC module and a second AC/AC module, and the loop closing system further comprises an energy storage unit; the first AC/AC module is respectively connected with the first power supply unit and one end of the first AC/DC module, and the other end of the first AC/DC module is connected with the energy storage unit; the second AC/AC module is respectively connected with the second power supply unit and one end of the second AC/DC module, and the other end of the second AC/DC module is connected with the energy storage unit; the control unit adjusts the working states of the first anti-fluctuation unit and the second anti-fluctuation unit according to the voltage of the first output voltage amplitude and the voltage of the second output voltage amplitude, and the control unit specifically comprises the following steps:
when the voltage value of the first output voltage amplitude is larger than that of the second output voltage amplitude, the first anti-fluctuation unit increases the direct-current voltage of the first AC/DC module, the second anti-fluctuation unit reduces the direct-current voltage of the second AC/DC module, and the second AC/AC module of the second anti-fluctuation unit outputs the voltage to a load corresponding to the second power supply unit;
when the voltage value of the first output voltage amplitude is smaller than the voltage value of the second output voltage amplitude, the first anti-fluctuation unit reduces the direct-current voltage of the first AC/DC module, the second anti-fluctuation unit increases the direct-current voltage of the second AC/DC module, and the first AC/AC module of the first anti-fluctuation unit outputs the voltage to a load corresponding to the first power supply unit.
In the loop closing method of the loop closing system based on double bus power supply, the percentage of the difference is 1%.
The invention also correspondingly provides a loop closing system based on double-bus power supply, which comprises a first power supply unit and a second power supply unit for supplying power to a load, a first anti-fluctuation unit for processing the electric energy output by the first power supply unit, a second anti-fluctuation unit for processing the electric energy output by the second power supply unit, a control unit and a loop closing switch S3, wherein the first power supply unit comprises a first switch S1, and the first anti-fluctuation unit comprises a first detection unit for detecting the amplitude of the output voltage of the first switch S1; the second power supply unit comprises a second switch S2, the second anti-fluctuation unit comprises a second detection unit for detecting the output voltage amplitude of the second switch S2, two ends of the loop closing switch S3 are respectively connected with the first switch S1 and the second switch S2, and the first switch S1, the second switch S2, the loop closing switch S3, the first detection unit and the second detection unit are respectively electrically connected with the control unit.
In the closed-loop system based on the double-bus power supply, the first anti-fluctuation unit comprises a first AC/DC module and a first AC/AC module, the second anti-fluctuation unit comprises a second AC/DC module and a second AC/AC module, and the closed-loop system further comprises an energy storage unit; the first AC/AC module is respectively connected with the first power supply unit and one end of the first AC/DC module, and the other end of the first AC/DC module is connected with the energy storage unit; the second AC/AC module is respectively connected with the second power supply unit and one end of the second AC/DC module, and the other end of the second AC/DC module is connected with the energy storage unit.
In the closed loop system based on the double-bus power supply, the first anti-fluctuation unit further comprises a first compensation part and a first capacitor bank, the first compensation part is arranged between the first AC/AC module and the first AC/DC module, one end of the first capacitor bank is connected with the other end of the first AC/DC module, and the other end of the first capacitor bank is connected with the energy storage unit; the second anti-fluctuation unit comprises a second compensation part and a second capacitor bank, the second compensation part is arranged between the second AC/AC module and the second AC/DC module, one end of the second capacitor bank is connected with the other end of the second AC/DC module, and the other end of the second capacitor bank is connected with the energy storage unit.
Has the advantages that:
before the loop closing operation is carried out, the control unit adjusts the working states of the first anti-fluctuation unit and the second anti-fluctuation unit according to the amplitude of the first output voltage of the first switch S1 and the amplitude of the second output voltage of the second switch S2, so that the output voltage of the first switch S1 and the output voltage of the second switch S2 are close to each other, the occurrence of overlarge loop current in the loop closing operation process is avoided, the safety degree of the loop closing operation is improved, and the stability and the reliability of a power grid during operation are improved.
Drawings
FIG. 1 is a first logic block diagram of a loop closing method provided by the present invention;
FIG. 2 is a second logic block diagram of the loop closing method provided by the present invention;
FIG. 3 is a schematic structural diagram of the loop closing system provided by the present invention.
Description of the main element symbols: the device comprises a control unit 1, a first anti-fluctuation unit 2, a first AC/AC module 21, a first AC/DC module 22, a first compensation part 23, a first capacitor bank 24, a second anti-fluctuation unit 3, a second AC/AC module 31, a second AC/DC module 32, a second compensation part 33, a second capacitor bank 34 and an energy storage unit 4.
Detailed Description
The invention provides a double-bus power supply-based loop closing system and a loop closing method, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and embodiments.
In the description of the present invention, it is to be understood that the terms "mounted," "connected," and the like are to be interpreted broadly, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
The application discloses a loop closing system based on double-bus power supply, including first power supply unit and second power supply unit for supplying power for load, when first transformer T1 of first power supply unit or second transformer T2 of second power supply unit need maintenance, must break first switch S1 or second switch S2, the load that originally supplied power through first switch S1 or second switch S2 needs to supply power through loop closing switch S3, therefore, it is necessary to carry out the loop closing operation.
Referring to fig. 1, the present invention provides a loop closing method for a loop closing system based on dual bus power supply, where the loop closing system includes a first power supply unit and a second power supply unit for supplying power to a load, a first anti-fluctuation unit 2 for processing power output by the first power supply unit, a second anti-fluctuation unit 3 for processing power output by the second power supply unit, a control unit 1, and a loop closing switch S3, where the first power supply unit includes a first switch S1, and the first anti-fluctuation unit 2 includes a first detection unit for detecting an output voltage amplitude of a first switch S1; the second power supply unit comprises a second switch S2, the second anti-ripple unit 3 comprises a second detection unit for detecting the amplitude of the 2-output voltage of the second switch S, two ends of the loop closing switch S3 are respectively connected with a first switch S1 and a second switch S2, and the first switch S1, the second switch S2, the loop closing switch S3, the first detection unit and the second detection unit are respectively electrically connected with the control unit 1, and the loop closing method comprises the steps of:
s100, when the control unit 1 receives a control instruction for starting a loop closing operation, the control unit 1 obtains a first output voltage amplitude of the first switch S1 fed back by the first detection unit, and obtains a second output voltage amplitude of the second switch S2 fed back by the second detection unit; the first detection unit samples the voltage at the output end of the first switch S1, and continuously samples and calculates the instantaneous value of the three-phase voltage output by the first switch S1 to obtain the amplitude of the three-phase voltage, i.e., the amplitude of the first output voltage; according to the first output voltage amplitude, a phase sequence and a phase angle can be obtained, and therefore a first phase is obtained; the second detection unit samples the voltage at the output end of the second switch S2, and continuously samples and calculates the instantaneous value of the three-phase voltage output by the second switch S2 to obtain the amplitude of the three-phase voltage, i.e., the amplitude of the second output voltage; according to the second output voltage amplitude, a phase sequence and a phase angle can be obtained, and a second phase is obtained; the first detection unit and the second detection unit are both in the prior art.
S200, the control unit 1 obtains a first phase according to the first output voltage amplitude and obtains a second phase according to the second output voltage amplitude.
S300, when the first phase is consistent with the second phase, the control unit 1 adjusts the working states of the first anti-fluctuation unit 2 and the second anti-fluctuation unit 3 according to the voltage of the first output voltage amplitude and the voltage of the second output voltage amplitude, so that the voltage of the first output voltage amplitude is close to the voltage of the second output voltage amplitude.
S310, when the first phase and the second phase are not consistent, the control unit 1 outputs a control instruction which cannot execute loop closing operation; when the first phase is different from the second phase, if the loop closing operation is performed, a loop closing short circuit is easy to occur, which causes a circuit fault.
S400, when the difference between the voltage value of the first output voltage amplitude and the voltage value of the second output voltage amplitude is smaller than or equal to the difference percentage preset in the control unit 1, the control unit 1 outputs a loop closing signal; on the contrary, the control unit 1 controls the loop closing system to repeatedly perform step S300 to ensure that the difference between the output voltage of the first switch S1 and the output voltage of the second switch S2 satisfies the loop closing condition.
When the difference between the voltage value of the first output voltage amplitude and the voltage value of the second output voltage amplitude is large, if the loop closing operation is performed, an overlarge circulating current is easy to occur, and after the loop closing operation is performed, an electric element in the loop is easy to overload, so that the safety degree of the loop closing operation and the stability of the loop closing system during operation are reduced.
After the control unit 1 outputs a loop closing signal, the loop closing signal may be an optical electrical signal; for example, the control unit 1 includes a control panel, an indicator lamp is disposed on the control panel, when the control unit 1 outputs the loop closing signal, the indicator lamp on the control panel is turned on, and the operator may close the loop closing switch S3 and then disconnect the switch corresponding to the power supply unit that needs to stop working.
Before the loop closing operation is performed, the control unit 1 adjusts the working states of the first anti-fluctuation unit 2 and the second anti-fluctuation unit 3 according to the first output voltage amplitude of the first switch S1 and the second output voltage amplitude of the second switch S2, so that the output voltage of the first switch S1 and the output voltage of the second switch S2 are close to each other, and an overlarge circulating current is avoided in the loop closing operation process, thereby avoiding an overload situation of an internal electrical element of a loop closing system after the loop closing operation, improving the safety of the loop closing operation and improving the stability and reliability of a power grid during operation.
Further, the control unit 1 obtains a first phase according to the first output voltage amplitude and obtains a second phase according to the second output voltage amplitude, and specifically includes the steps of:
the control unit 1 obtains a first phase from the phase angle and phase sequence of the first output voltage amplitude and a second phase from the phase angle and phase sequence of the second output voltage amplitude.
Further, referring to fig. 2, the first anti-fluctuation unit 2 includes a first AC/DC module 22 and a first AC/AC module 21, the second anti-fluctuation unit 3 includes a second AC/DC module 32 and a second AC/AC module 31, and the closed loop system further includes an energy storage unit 4; the first AC/AC module 21 is connected to the first power supply unit and one end of the first AC/DC module 22, respectively, and the other end of the first AC/DC module 22 is connected to the energy storage unit 4; the second AC/AC module 31 is connected to a second power supply unit and one end of the second AC/DC module 32, and the other end of the second AC/DC module 32 is connected to the energy storage unit 4; the control unit 1 adjusts the working states of the first anti-fluctuation unit 2 and the second anti-fluctuation unit 3 according to the voltage of the first output voltage amplitude and the voltage of the second output voltage amplitude, and specifically comprises the following steps:
s301, when the voltage value of the first output voltage amplitude is larger than that of the second output voltage amplitude, namely the output voltage of the first switch S1 is larger than that of the second switch S2; the second anti-fluctuation unit 3 reduces the direct-current voltage of the second AC/DC module 32, the input current of the second anti-fluctuation unit 3 is reduced, and the input voltage of the second anti-fluctuation unit 3 is increased due to the reduction of the input current; the first anti-fluctuation unit 2 increases the direct-current voltage of the first AC/DC module 22, the increase of the direct-current voltage increases the charging current of the energy storage unit 4, the second AC/AC module 31 of the second anti-fluctuation unit 3 outputs the voltage to the load corresponding to the second power supply unit, at this time, the input current of the first anti-fluctuation unit 2 increases due to the burden of the load of the second anti-fluctuation unit 3 and the increase of the charging current, and the input voltage of the first anti-fluctuation unit 2 decreases due to the increase of the input current; the output voltage of the first switch S1 and the output voltage of the second switch S2 are gradually brought close.
S302, when the voltage value of the first output voltage amplitude is smaller than the voltage value of the second output voltage amplitude, namely the output voltage of the first switch S1 is smaller than the output voltage of the second switch S2; the first anti-fluctuation unit 2 reduces the direct current voltage of the first AC/DC module 22, the input current of the first anti-fluctuation unit 2 is reduced, and the input voltage of the first anti-fluctuation unit 2 is increased due to the reduction of the input current; the second anti-fluctuation unit 3 increases the direct-current voltage of the second AC/DC module 32, the increase of the direct-current voltage increases the charging current of the energy storage unit 4, the first AC/AC module 21 of the first anti-fluctuation unit 2 outputs the voltage to the load corresponding to the first power supply unit, at this time, the input current of the second anti-fluctuation unit 3 increases due to the load of the first anti-fluctuation unit 2 and the increase of the charging current, and the input voltage of the second anti-fluctuation unit 3 decreases due to the increase of the input current; the output voltage of the first switch S1 and the output voltage of the second switch S2 are gradually brought close.
Further, the percentage of the difference is 1%, when the difference between the output voltage of the first switch S1 and the output voltage of the second switch S2 is less than 1%, the amplitude of the output voltage of the first switch S1 is substantially close to the amplitude of the output voltage of the second switch S2, and the safety of the loop closing operation is greatly improved.
Referring to fig. 3, the present invention further provides a loop closing system based on dual bus power supply, which includes a first power supply unit and a second power supply unit for supplying power to a load, a first anti-fluctuation unit 2 for processing the power output by the first power supply unit, a second anti-fluctuation unit 3 for processing the power output by the second power supply unit, a control unit 1, and a loop closing switch S3, wherein the first power supply unit includes a first switch S1, and the first anti-fluctuation unit 2 includes a first detection unit for detecting the output voltage amplitude of the first switch S1; the second power supply unit comprises a second switch S2, the second anti-fluctuation unit 3 comprises a second detection unit for detecting the amplitude of the output voltage of the second switch S2, two ends of the loop closing switch S3 are respectively connected with the first switch S1 and the second switch S2, and the first switch S1, the second switch S2, the loop closing switch S3, the first detection unit and the second detection unit are respectively electrically connected with the control unit 1.
When the first power supply unit needs to be maintained, the first switch S1 is switched off, and the second switch S2 and the loop closing switch S3 are switched on, so that loop closing is realized, and power is supplied to a load corresponding to the first power supply unit and a load corresponding to the second power supply unit; when the second power supply unit needs to be maintained, the second switch S2 is turned off, and the first switch S1 and the loop closing switch S3 are turned on, so as to implement loop closing and supply power to the load corresponding to the first power supply unit and the load corresponding to the second power supply unit.
Further, referring to fig. 3, the first anti-fluctuation unit 2 includes a first AC/DC module 22 and a first AC/AC module 21, the second anti-fluctuation unit 3 includes a second AC/DC module 32 and a second AC/AC module 31, and the closed loop system further includes an energy storage unit 4; the first AC/AC module 21 is connected to the first power supply unit and one end of the first AC/DC module 22, respectively, and the other end of the first AC/DC module 22 is connected to the energy storage unit 4; the second AC/AC module 31 is connected to one end of the second power supply unit and one end of the second AC/DC module 32, and the other end of the second AC/DC module 32 is connected to the energy storage unit 4.
Further, referring to fig. 3, the first anti-fluctuation unit 2 further includes a first compensation portion 23 and a first capacitor bank 24, the first compensation portion 23 is disposed between the first AC/AC module 21 and the first AC/DC module 22, one end of the first capacitor bank 24 is connected to the other end of the first AC/DC module 22, and the other end of the first capacitor bank 24 is connected to the energy storage unit 4; the second anti-fluctuation unit 3 comprises a second compensation part 33 and a second capacitor bank 34, the second compensation part 33 is arranged between the second AC/AC module 31 and the second AC/DC module 32, one end of the second capacitor bank 34 is connected with the other end of the second AC/DC module 32, and the other end of the second capacitor bank 34 is connected with the energy storage unit 4; the first compensation part 23 and the second compensation part 33 are used for realizing voltage compensation; the first compensation part 23 is matched with the first capacitor bank 24, so that the stability of the first anti-fluctuation unit 2 in working can be improved; the second compensation part 33 and the second capacitor bank 34 cooperate to improve the stability of the second anti-fluctuation unit 3 during operation.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (7)
1. The loop closing method of the loop closing system based on double-bus power supply is characterized in that the loop closing system comprises a first power supply unit and a second power supply unit which are used for supplying power to a load, a first anti-fluctuation unit which is used for processing the electric energy output by the first power supply unit, a second anti-fluctuation unit which is used for processing the electric energy output by the second power supply unit, a control unit and a loop closing switch S3, wherein the first power supply unit comprises a first switch S1, and the first anti-fluctuation unit comprises a first detection unit which is used for detecting the amplitude of the output voltage of the first switch S1; the second power supply unit comprises a second switch S2, the second anti-ripple unit comprises a second detection unit for detecting a 2-output voltage amplitude of the second switch S, two ends of the loop closing switch S3 are respectively connected with a first switch S1 and a second switch S2, and the first switch S1, the second switch S2, the loop closing switch S3, the first detection unit and the second detection unit are respectively electrically connected with the control unit, and the loop closing method comprises the steps of:
when the control unit receives a control instruction for starting a loop closing operation, the control unit acquires a first output voltage amplitude of the first switch S1 fed back by the first detection unit and acquires a second output voltage amplitude of the second switch S2 fed back by the second detection unit;
the control unit acquires a first phase according to the first output voltage amplitude and acquires a second phase according to the second output voltage amplitude;
when the first phase is consistent with the second phase, the control unit adjusts the working states of the first anti-fluctuation unit and the second anti-fluctuation unit according to the voltage of the amplitude of the first output voltage and the voltage of the amplitude of the second output voltage, so that the voltage of the amplitude of the first output voltage is close to the voltage of the amplitude of the second output voltage;
when the difference between the voltage value of the first output voltage amplitude and the voltage value of the second output voltage amplitude is smaller than or equal to the difference percentage preset in the control unit, the control unit outputs a loop closing signal.
2. The loop closing method of the loop closing system based on the double-bus power supply as recited in claim 1, wherein the control unit obtains a first phase according to the first output voltage amplitude and obtains a second phase according to the second output voltage amplitude, and specifically comprises the steps of:
the control unit acquires a first phase according to the phase angle and the phase sequence of the amplitude of the first output voltage, and acquires a second phase according to the phase angle and the phase sequence of the amplitude of the second output voltage.
3. The loop closing method for the loop closing system based on the double-bus power supply is characterized in that the first anti-fluctuation unit comprises a first AC/DC module and a first AC/AC module, the second anti-fluctuation unit comprises a second AC/DC module and a second AC/AC module, and the loop closing system further comprises an energy storage unit; the first AC/AC module is respectively connected with the first power supply unit and one end of the first AC/DC module, and the other end of the first AC/DC module is connected with the energy storage unit; the second AC/AC module is respectively connected with the second power supply unit and one end of the second AC/DC module, and the other end of the second AC/DC module is connected with the energy storage unit; the control unit adjusts the working states of the first anti-fluctuation unit and the second anti-fluctuation unit according to the voltage of the first output voltage amplitude and the voltage of the second output voltage amplitude, and the control unit specifically comprises the following steps:
when the voltage value of the first output voltage amplitude is larger than that of the second output voltage amplitude, the first anti-fluctuation unit increases the direct-current voltage of the first AC/DC module, the second anti-fluctuation unit reduces the direct-current voltage of the second AC/DC module, and the second AC/AC module of the second anti-fluctuation unit outputs the voltage to a load corresponding to the second power supply unit;
when the voltage value of the first output voltage amplitude is smaller than the voltage value of the second output voltage amplitude, the first anti-fluctuation unit reduces the direct-current voltage of the first AC/DC module, the second anti-fluctuation unit increases the direct-current voltage of the second AC/DC module, and the first AC/AC module of the first anti-fluctuation unit outputs the voltage to a load corresponding to the first power supply unit.
4. The loop closing method for the loop closing system based on the double-bus power supply is characterized in that the difference percentage is 1%.
5. A loop closing system based on double-bus power supply is characterized by comprising a first power supply unit and a second power supply unit for supplying power to a load, a first anti-fluctuation unit for processing electric energy output by the first power supply unit, a second anti-fluctuation unit for processing electric energy output by the second power supply unit, a control unit and a loop closing switch S3, wherein the first power supply unit comprises a first switch S1, and the first anti-fluctuation unit comprises a first detection unit for detecting the amplitude of output voltage of a first switch S1; the second power supply unit comprises a second switch S2, the second anti-fluctuation unit comprises a second detection unit for detecting the output voltage amplitude of the second switch S2, two ends of the loop closing switch S3 are respectively connected with the first switch S1 and the second switch S2, and the first switch S1, the second switch S2, the loop closing switch S3, the first detection unit and the second detection unit are respectively electrically connected with the control unit.
6. The dual bus power supply-based loop closing system according to claim 5, wherein the first anti-fluctuation unit comprises a first AC/DC module and a first AC/AC module, the second anti-fluctuation unit comprises a second AC/DC module and a second AC/AC module, and the loop closing system further comprises an energy storage unit; the first AC/AC module is respectively connected with the first power supply unit and one end of the first AC/DC module, and the other end of the first AC/DC module is connected with the energy storage unit; the second AC/AC module is respectively connected with the second power supply unit and one end of the second AC/DC module, and the other end of the second AC/DC module is connected with the energy storage unit.
7. The loop closing system based on double-bus power supply according to claim 6, wherein the first anti-fluctuation unit further comprises a first compensation portion and a first capacitor bank, the first compensation portion is disposed between the first AC/AC module and the first AC/DC module, one end of the first capacitor bank is connected to the other end of the first AC/DC module, and the other end of the first capacitor bank is connected to the energy storage unit; the second anti-fluctuation unit comprises a second compensation part and a second capacitor bank, the second compensation part is arranged between the second AC/AC module and the second AC/DC module, one end of the second capacitor bank is connected with the other end of the second AC/DC module, and the other end of the second capacitor bank is connected with the energy storage unit.
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| CN106786609A (en) * | 2017-04-05 | 2017-05-31 | 国网山东省电力公司济南供电公司 | A kind of distribution line cyclization fast calibration method based on data fusion |
| CN111697592A (en) * | 2020-06-04 | 2020-09-22 | 广东创电科技有限公司 | Voltage stabilizing system and method of elevator double-bus power supply system |
| CN111711187A (en) * | 2020-06-04 | 2020-09-25 | 广东创电科技有限公司 | Double-bus power supply system and control method |
| CN111952970A (en) * | 2020-08-17 | 2020-11-17 | 云南电网有限责任公司电力科学研究院 | Power distribution network loop closing and power adjusting method and device |
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2021
- 2021-01-19 CN CN202110069541.XA patent/CN112821389A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786609A (en) * | 2017-04-05 | 2017-05-31 | 国网山东省电力公司济南供电公司 | A kind of distribution line cyclization fast calibration method based on data fusion |
| CN111697592A (en) * | 2020-06-04 | 2020-09-22 | 广东创电科技有限公司 | Voltage stabilizing system and method of elevator double-bus power supply system |
| CN111711187A (en) * | 2020-06-04 | 2020-09-25 | 广东创电科技有限公司 | Double-bus power supply system and control method |
| CN111952970A (en) * | 2020-08-17 | 2020-11-17 | 云南电网有限责任公司电力科学研究院 | Power distribution network loop closing and power adjusting method and device |
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