CN110783915A - Multi-distribution-platform-area power supply method and power supply system - Google Patents
Multi-distribution-platform-area power supply method and power supply system Download PDFInfo
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Abstract
The invention relates to a power supply method and a power supply system for multiple power distribution areas. A power supply method for multiple power distribution areas comprises the following steps: s1, the master station receives the station operation information of the power distribution station controllers in real time, when the fault station information occurs, one power distribution station with the lowest load in the rest power distribution stations without faults is selected as a power supply station, and a control instruction is sent to the station controller of the power supply station to enable the contact switch of the power supply station to be switched on, so that the contact line is electrified; and S2, the master station sends a control instruction to the station controller of the fault station area, so that the contact switch of the fault station area is switched on to supply power to the fault station area. The invention provides a power supply method for multiple power distribution areas, which has the following effects: 1. if the high-voltage side has faults, the high-voltage side maintenance is not influenced under the condition of ensuring normal power supply; 2. when the single transformer supplies power for the loads of the two power distribution areas, orderly power supply can be performed according to the importance of the loads.
Description
Technical Field
The invention relates to power supply of distribution substations, in particular to a power supply method and a power supply system of multiple distribution substations.
Background
With the development of society, the requirement on power supply reliability is higher and higher, and nowadays, in rural areas, the pole-mounted transformer is mostly adopted for power supply under the influence of economic environment, terrain and users. The transformer substation is different from distribution rooms and box transformers in cities and towns, so that the whole distribution area of the transformer substation is powered off when the high-voltage side of the transformer fails. Meanwhile, because the rural loads are unbalanced, the operation loads of the transformers in different time periods are greatly different.
The existing recent scheme is a connection switch scheme of a power distribution room, and the scheme requires that a double transformer is in one power distribution room and can only meet the requirement of short distance. And when one transformer has power failure, the power failure part is supplied with power through the interconnection switch, and in order to ensure that the transformer does not run in an overload mode, the transformer capacity of the transformer needs to meet the whole load capacity of two transformer areas, so that half of the transformer capacity is wasted, the investment is increased, the transformer is only suitable for the condition that the two transformer areas are very close, and the transformer areas on columns in rural areas are difficult to adapt.
Patent document No. 201810105248.2 discloses an automatic switching system for rural power distribution network power consumption, which is mainly an automatic switching system for seasonal power consumption adjustment of a rural power grid, and essentially does not solve the problem that normal power supply can be guaranteed in a maintenance process after a distribution area fails.
Therefore, there is a need for innovation and invention in the art.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a multi-distribution-station power supply method and a power supply system, which can normally supply power in the fault removal process after the distribution station fails, improve the power supply reliability, improve the running efficiency of a transformer, reduce the loss and realize reasonable and orderly power utilization.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power supply method for multiple power distribution areas comprises the following steps:
s1, the master station receives the station operation information of the power distribution station controllers in real time, when the fault station information occurs, one power distribution station with the lowest load in the rest power distribution stations without faults is selected as a power supply station, and a control instruction is sent to the station controller of the power supply station to enable the contact switch of the power supply station to be switched on, so that the contact line is electrified;
and S2, the master station sends a control instruction to the station controller of the fault station area, so that the contact switch of the fault station area is switched on to supply power to the fault station area.
In the preferable power supply method for multiple power distribution areas, in step S1, after the fault area has a fault, the incoming line switch is tripped for protection, and all the outgoing line switches are tripped under voltage.
In the preferable power supply method for multiple power distribution areas, in step S2, after power is supplied to the fault area, a part of the outgoing line switches are selectively switched on according to the priority of the load.
Preferably, the power supply method for multiple power distribution areas further includes the steps of:
and S3, after the fault of the fault area is eliminated, controlling the contact switch of the fault area to be switched off, then controlling the incoming line switch to be switched on, and then executing switching-on operation on all outgoing line switches according to the load priority sequence.
A power supply system with multiple power distribution areas applying the power supply method comprises a main station and a plurality of groups of power distribution areas;
the distribution station area includes: the system comprises a transformer, an incoming switch, a plurality of outgoing switches, a tie switch and a cell controller;
the transformer is used for converting high-voltage electricity of a high-voltage system into low-voltage electricity to be output;
the incoming line switch is connected with the transformer and is provided with an incoming undervoltage protection unit for controlling the on-off of the low-voltage converted by the transformer;
the outgoing switch is connected with the incoming switch;
the interconnection switch is respectively connected with the incoming line switch and the outgoing line switches and is provided with a dual-power supply unit;
the cell controller is provided with a standby power supply which is in communication connection with the incoming line switch, the outgoing line switches, the interconnection switch and the main station respectively;
the interconnection switches of the groups of distribution areas are connected with each other by interconnection lines.
Preferably, in the multi-distribution-station-area power supply system, the outgoing switch is provided with an outgoing undervoltage protection unit and an outgoing and closing unit.
Preferably, in the power supply system with multiple power distribution areas, the area controller further includes a storage unit, configured to store load priority data of the power distribution areas of the group.
Preferably, in the power supply system with multiple distribution areas, the communication connection includes wired communication and wireless communication.
Preferably, in the power supply system with multiple power distribution areas, the incoming line switch further includes a closing unit for controlling closing and opening of the switch according to the wired or wireless communication instruction.
Compared with the prior art, the power supply method and the power supply system for the multiple power distribution areas have the following effects:
1. if the high-voltage side has a fault, under the condition of ensuring normal power supply, the high-voltage side maintenance is not influenced, and the power supply reliability is effectively improved;
2. when the single transformer supplies power to the loads of the two power distribution areas, orderly power supply can be carried out according to the importance of the loads, so that the condition that the power supply load exceeds the normal load of the transformer and the equipment is damaged is avoided;
3. the capacity of the transformer does not need to be increased for a single power distribution area, the cost is low, and the realization is easy.
Drawings
FIG. 1 is a flow chart of a method for supplying power to multiple distribution areas according to the present invention;
fig. 2 is a block diagram of a power supply system of multiple distribution areas provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a power supply method for multiple power distribution areas, which comprises the following steps:
s1, the master station receives the station operation information of the power distribution station controllers in real time, when the fault station information occurs, one power distribution station with the lowest load in the rest power distribution stations without faults is selected as a power supply station, and a control instruction is sent to the station controller of the power supply station to enable the contact switch of the power supply station to be switched on, so that the contact line is electrified;
and S2, the master station sends a control instruction to the station controller of the fault station area, so that the contact switch of the fault station area is switched on to supply power to the fault station area.
Correspondingly, the invention provides a power supply system with multiple power distribution areas, which is characterized by comprising a master station 1 and a plurality of groups of power distribution areas 2;
the distribution station area 2 includes: a transformer 21, an incoming switch 22, a plurality of outgoing switches 24, a tie switch 25 and a cell controller 23;
the transformer 21 is used for converting high-voltage electricity of a high-voltage system into low-voltage electricity to be output;
the incoming line switch 22 is connected with the transformer 21, and is provided with an incoming undervoltage protection unit for controlling the on-off of the low-voltage converted by the transformer 21; the voltage inlet and undervoltage protection unit controls the inlet switch 22 to perform trip protection under the condition that the inlet end of the inlet switch 22 is in voltage loss;
the outgoing switch 24 is connected with the incoming switch 22;
the interconnection switch 25 is respectively connected with the incoming line switch 22 and the outgoing line switches 24 and is provided with a dual-power supply unit;
the cell controller 23 is provided with a standby power supply and is in communication connection with the incoming line switch 22, the outgoing line switches 24, the interconnection switch 25 and the master station 1 respectively;
several of the interconnection switches 25 of several groups of distribution areas 2 are connected to each other using interconnection lines.
Specifically, the dual power supply unit is configured to supply power bidirectionally, and when the incoming line switch 22 supplies power, the interconnection switch 25 is switched on to supply power to the interconnection line; when the incoming line switch 22 is not powered and the tie line is charged, the tie switch 25 is switched on to supply power to the outgoing line switch 24.
In general, a plurality of the interconnection switches 25 are in an off state, and only in case of a fault, the interconnection switches 25 perform switching on and off operations according to a command of the corresponding zone controller 23. The master station 1 collects load condition data of a plurality of groups of distribution areas 2 in real time. Each group of distribution transformer areas 2 is provided with a plurality of outgoing line switches 24, the outgoing line switches 24 are connected with each user, and simultaneously control the circuit of each user to be switched on and off, the circuit of each outgoing line switch 24 is connected with the incoming line switch 22, under the master control of the incoming line switch 22, when the distribution transformer areas 2 have faults, such as the high-voltage system loses voltage, the transformer 21 cannot output low voltage electricity, the end, connected with the transformer 21, of the incoming line switch 22 is in a voltage loss state, the incoming line switch 22 trips under the work of the undervoltage incoming protection unit, and at the moment, the transformer areas control the standby power supply to be used by the transformer areas to provide fault information for the main station 1; the master station 1 collects a plurality of controllers of the master station 1 connected with the controllers, one power distribution area with the lowest load in the rest power distribution areas without faults is selected as a power supply area, and after receiving the control instruction, the area controller 23 of the power supply area controls the contact switch 25 of the power supply area to be switched on, and at the moment, the contact line is electrified; the main station 1 sends an instruction to the station controller 23 of the fault power distribution station area to control the contact switch 25 of the fault power distribution station area to be switched on, because at this time, among the contact switches 25, only the fault station area and the contact switch 25 of the power supply station area are in a switched-on state, the current of the power supply station area sequentially passes through the incoming line switch 22 and the contact switch 25 of the power supply station area and the contact switch 25 and the outgoing line switch 24 of the fault station area to supply power to users. If a plurality of power distribution substations 2 are out of order, one power supply substation supplies power to all the failed substations.
Preferably, in this embodiment, the outgoing line switch 24 has an outgoing undervoltage protection unit and an outgoing closing unit. The switching-on and switching-off unit is used for controlling the switching-on and switching-off operations of the outgoing line switch 24 according to the instruction of the station controller 23.
Correspondingly, in step S1, after the fault area has a fault, the incoming line switch 22 is tripped for protection, and all the outgoing line switches 24 are tripped under voltage.
Preferably, in this embodiment, the cell controller 23 further includes a storage unit, configured to store load priority data of the group of power distribution cells 2.
Correspondingly, in step S2, after the power is supplied to the fault area, a part of the outgoing line switches 24 are selectively switched on according to the priority of the load.
Further comprising the steps of:
and S3, after the fault of the fault station area is eliminated, controlling the contact switch 25 of the fault station area to be switched off, then controlling the incoming line switch 22 to be switched on, and then performing switching-on operation on all outgoing line switches 24 according to the load priority sequence.
Preferably, in this embodiment, the communication connection includes wired communication and wireless communication. The wired communication is communication by using an RS232 interface; the wireless communication is communication by using a 4G communication module. The communication and remote control between the main station 1 and the cell controller 23, and between the cell controller 23 and the incoming line switch 22, the outgoing line switches 24 and the interconnection switch 25 in the group of distribution cells 2 can be realized.
As a preferable scheme, in this embodiment, the incoming line switch 22 further includes a closing unit, configured to control closing and opening of the switch according to the instruction of the wired communication or the wireless communication.
Specifically, the master station 1 is preferably in communication connection with the cell controllers 23 of the plurality of power distribution cells 2 by using wireless communication; the station controller 23 is preferably in communication connection with the incoming switch 22, the outgoing switch 24 and the interconnection switch 25 in the group of distribution stations 2, preferably using wired communication.
Take two power distribution area contacts as an example:
in the process of realizing communication between the two power distribution areas, if the two power distribution areas are in a normal operation state and are supplied with power by respective transformers 21, the communication switches 25 of the two power distribution areas need to be ensured to be in an off state for operation, namely, the 1# area and the 2# area cannot be in an on state; even if one of the interconnection switches 25 is in a closed state, the interconnection switch 25 of the other distribution substation is in an open state, that is, the 1# substation interconnection switch 25 and the 2# substation interconnection switch 25 cannot be closed simultaneously.
If the transformer 21 stops supplying power due to a high-voltage system fault in the 1# distribution station area, the low-voltage side of the transformer 21 loses voltage, the incoming switch 22 of the 1# distribution station area trips in an undervoltage protection mode, at the moment, n outgoing switches 24 of the 1# distribution station area trip in the undervoltage protection mode, and the station controller 23 of the 1# distribution station area receives information of the tripping of the incoming switch 22 (when the station control and the incoming switch 22 are in wired communication, the incoming switch 22 is detected to have no electric signal feedback to be a tripping signal), the information is wireless communication, a device signal of the incoming switch 22 cannot be searched in effective time or a device signal of the incoming switch 22 cannot be searched for several times in effective time to be a tripping signal) and is fed back to the main station 1, and the contact switch 25 of the 1# distribution station area is controlled to be switched on; after receiving the fault signal of the 1# power distribution station, the master station 1 firstly informs a worker to overhaul, sends a control instruction to the station controller 23 of the 2# power distribution station, firstly controls the contact switch 25 of the 2# power distribution station to be switched on, and at the moment, the contact line is electrified to supply power to the 1# power distribution station; meanwhile, the station controller 23 of the 1# power distribution station sequentially performs switching-on operation on part or all (as the case may be) of the n outgoing switches 24 of the 1# power distribution station according to the load importance (for example, water supply and public utility power with high priority), so as to realize power restoration.
If the high-voltage side power supply in the transformer 21 of the 1# distribution transformer area is recovered, the controller 23 of the 1# distribution transformer area controls the contact switch 25 of the local transformer area to be switched off, at this time, the contact between the 1# distribution transformer area and the 2# distribution transformer area is disconnected, n outgoing switches 24 of the 1# transformer area trip due to undervoltage protection, then the controller 23 of the 1# transformer area controls the incoming switches 22 of the 1# distribution transformer area to be switched on, and then n outgoing switches 24 are sequentially switched on according to important conditions, so that the power supply recovery is realized.
To ensure that the transformer 21 is not overloaded during operation. The cell controller 23 can selectively recover the power supply of 1-n loads according to the important condition of the loads so as to ensure that the transformer 21 is not burnt due to overload when all the loads are put into use. The load control strategy may be issued by the master station to the cell controller 23.
The multi-distribution-platform-area power supply method and the power supply system have the following effects:
1. mutual backup power supply between two transformer areas can be realized, and the power supply reliability is effectively improved;
2. if the high-voltage side is out of line, the power supply of the high-voltage side does not influence the high-voltage side maintenance;
3. when the single transformer 21 supplies power for the two platform area loads, orderly power supply can be carried out according to the importance of the loads, so that the condition that the power supply load exceeds the normal load of the transformer 21 and the equipment is damaged is avoided;
4. the capacity of the transformer 21 does not need to be increased for a single power distribution area, and the effect is achieved under the condition that the cost is not changed.
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 scope of the appended claims.
Claims (9)
1. A power supply method for multiple power distribution areas is characterized by comprising the following steps:
s1, the master station receives the station operation information of the power distribution station controllers in real time, when the fault station information occurs, one power distribution station with the lowest load in the rest power distribution stations without faults is selected as a power supply station, and a control instruction is sent to the station controller of the power supply station to enable the contact switch of the power supply station to be switched on, so that the contact line is electrified;
and S2, the master station sends a control instruction to the station controller of the fault station area, so that the contact switch of the fault station area is switched on to supply power to the fault station area.
2. The method according to claim 1, wherein in step S1, after the fault station has a fault, the incoming line switch protection is tripped, and all outgoing line switches are tripped under voltage.
3. The method for supplying power to multiple distribution areas according to claim 2, wherein in step S2, after the power is supplied to the fault area, a part of the outgoing switches are selectively closed according to the priority of the load.
4. A method for supplying power to multiple distribution bays as claimed in claim 1, further comprising the steps of:
and S3, after the fault of the fault area is eliminated, controlling the contact switch of the fault area to be switched off, then controlling the incoming line switch to be switched on, and then executing switching-on operation on all outgoing line switches according to the load priority sequence.
5. A multi-distribution-station-area power supply system applying the power supply method of any one of claims 1 to 4, which is characterized by comprising a main station, a plurality of groups of distribution stations;
the distribution station area includes: the system comprises a transformer, an incoming switch, a plurality of outgoing switches, a tie switch and a cell controller;
the transformer is used for converting high-voltage electricity of a high-voltage system into low-voltage electricity to be output;
the incoming line switch is connected with the transformer and is provided with an incoming undervoltage protection unit for controlling the on-off of the low-voltage converted by the transformer;
the outgoing switch is connected with the incoming switch;
the interconnection switch is respectively connected with the incoming line switch and the outgoing line switches and is provided with a dual-power supply unit;
the cell controller is provided with a standby power supply which is in communication connection with the incoming line switch, the outgoing line switches, the interconnection switch and the main station respectively;
the interconnection switches of the groups of distribution areas are connected with each other by interconnection lines.
6. The power supply system of claim 5, wherein the outlet switch has an outlet undervoltage protection unit and an outlet closing unit.
7. The multiple distribution bay power supply system of claim 6, wherein the bay controller further comprises a storage unit for storing load priority data for a group of distribution bays.
8. The multiple distribution bay power supply system of claim 5, wherein said communication link includes wired and wireless communication.
9. The power supply system of claim 8, wherein the incoming switch further comprises a closing unit for controlling the closing and opening of the incoming switch according to the command of the wired or wireless communication.
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| CN201911042612.6A CN110783915A (en) | 2019-10-30 | 2019-10-30 | Multi-distribution-platform-area power supply method and power supply system |
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| CN201911042612.6A CN110783915A (en) | 2019-10-30 | 2019-10-30 | Multi-distribution-platform-area power supply method and power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111953294A (en) * | 2020-07-22 | 2020-11-17 | 国网河南省电力公司西峡县供电公司 | Power backup system and method for station area based on Internet of Things |
| CN113659723A (en) * | 2021-08-19 | 2021-11-16 | 国网江苏省电力有限公司泰州供电分公司 | Intelligent user fault studying and judging system and implementation method |
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| CN105552919A (en) * | 2016-03-02 | 2016-05-04 | 东方电子股份有限公司 | Overload processing method for main transformer after automatic switching action of power system |
| CN107086580A (en) * | 2017-06-01 | 2017-08-22 | 深圳市深泰明科技有限公司 | A ring network intelligent control system and its control method |
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2019
- 2019-10-30 CN CN201911042612.6A patent/CN110783915A/en active Pending
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| CN103296677A (en) * | 2013-05-09 | 2013-09-11 | 国家电网公司 | On-line large power grid recovery assistant decision-making system |
| CN105552919A (en) * | 2016-03-02 | 2016-05-04 | 东方电子股份有限公司 | Overload processing method for main transformer after automatic switching action of power system |
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| CN111953294A (en) * | 2020-07-22 | 2020-11-17 | 国网河南省电力公司西峡县供电公司 | Power backup system and method for station area based on Internet of Things |
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| CN113659723A (en) * | 2021-08-19 | 2021-11-16 | 国网江苏省电力有限公司泰州供电分公司 | Intelligent user fault studying and judging system and implementation method |
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Application publication date: 20200211 |