CN203859583U - Multipath parallel redundant substation DC power supply system - Google Patents
Multipath parallel redundant substation DC power supply system Download PDFInfo
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- CN203859583U CN203859583U CN201420157488.4U CN201420157488U CN203859583U CN 203859583 U CN203859583 U CN 203859583U CN 201420157488 U CN201420157488 U CN 201420157488U CN 203859583 U CN203859583 U CN 203859583U
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Abstract
The utility model provides a multipath parallel redundant substation DC power supply system, which is formed by connecting a plurality of high-boost DC/DC converters and a storage battery pack of an original DC power supply system of a substation in parallel. When bus voltage of the DC power supply system is lower than a set value, voltage of storage batteries is boosted through the high-boost DC/DC converters and transmitted to a DC bus so as to provide power for loads, and multipath parallelly connected DC/DC converters can realize current sharing, thereby ensuring a DC power supply of the substation to be reliable. The multipath parallel redundant substation DC power supply system is a redundancy technology, the original DC power supply system operates normally under a normal circumstance, the additionally arranged multipath DC/DC converters stay at a hot standby state, and operations of the original DC power supply system are not affected. Therefore, the multipath parallel redundant substation DC power supply system enables the current DC power supply system of the substation to be more reliable. The multipath parallel redundant substation DC power supply system solves a problem of DC power supply under extreme conditions of AC voltage loss of variable voltage, damages of a rectifier module and open circuit of the storage batteries, eliminates occurrence of voltage loss of the DC bus of the substation, and has great practical values.
Description
Technical field
The utility model relates to the highly reliable power supply plan of transforming plant DC power-supply system.Be that a kind of multi-channel parallel redundant technique is applied to transforming plant DC power-supply system specifically, make its power supply reliability higher.
Background technology
DC power system forms by exchanging input, charging device, feed panel, batteries, monitoring unit (containing feeder line Condition Monitoring Unit), insulating monitoring (containing earthing wire-selecting), silicon reduction voltage loop (optional), battery tension inspection device, voltage and current measurement table meter, DC feeder network etc.It is as the power supply of Substation control load and the important DC load of part.During normal operation, charging device provides required electric current for corresponding load, simultaneously for storage battery provides floating current.Under ac voltage losing or charging device damage situation, storage battery transfers main power supply to by back-up source to be used.Southern Power Grid Company transforming plant DC power-supply system technical specification to the equipping rules of DC power system is: 220～500kV transforming plant DC power-supply system all should configure two groups of high frequency charging devices and two group storage batteries, and 110kV transforming plant DC power-supply system should configure two groups of high frequency charging devices and two group storage batteries.The DC power system of two group storage battery two cover charging devices should adopt two sections of single bus schemes, between two sections of DC buss, should establish contact electrical equipment.Every group storage battery group and charging device should access respectively different buses.
DC power supply is as the power source of the equipment such as Substation control signal, relaying protection, automatics, circuit breaker breaker tripping and closing.Its reliability plays vital effect to the safe operation of transformer station.Although being DC power system, transformer station configured storage battery power supply in support.Yet, due to the model of storage battery, technique, batch etc. the product inconsistency that causes of factor, make respectively to save accumulator property difference to some extent, in use, the decision that its life-span do as one likes of the storage battery of a plurality of series connection can be the poorest.In the transformer station putting into operation for many years, the capacity of storage battery, internal resistance meeting change.Make battery life have " wooden barrel effect ".When there is open circuit in a joint storage battery.Batteries loses the effect of back-up source.At this moment, the reliability of DC power system reduces.In running, fact proved, the transformer station's no-voltage of entire station accident causing because of ac voltage losing and storage battery open circuit occurs to some extent.
Utility model content
The purpose of this utility model is: the transformer station's no-voltage of entire station accident causing for transformer station's ac voltage losing and storage battery open circuit, propose a kind ofly based on the boost multi-channel parallel redundant technique of DC/DC converter of height, to be applied to transforming plant DC power-supply system, solve the problem of transformer station's no-voltage of entire station.
The technical solution that the utility model is realized above-mentioned purpose is as follows:
DC power system batteries is divided into many groups, and each group storage battery is by current potential height respectively as the input of the DC/DC converter that respectively boosts, and the output of converter connects DC bus by check diode.
Described system further comprises following circuit structure:
The high booster converter of DC/DC of constant frequency phase shifting control; This booster converter main circuit adopts full-bridge topologies, its power switch tube S
1input and power switch tube S
2input be connected with anode again after being connected, power switch tube S
3with power switch tube S
4output be connected with the negative pole of battery again after being connected; Two switching tubes of each brachium pontis are complementary conduction mode, four switching tube diagonal angle conductings simultaneously;
Resonant network comprises: power switch tube S
1output and power switch tube S
4input be connected with resonant network input, power switch tube S
2output and power switch tube S
3input be connected with resonant network input; Resonant network output is connected with transformer primary side.
Resonant network adopts second order, three rank or resonant network structures more than three rank, the first end of resonant network output is connected with the first end of the former limit of high-frequency isolation transformer T input, and the second end of its output is connected with the second end of the former limit of high-frequency isolation transformer T input; High-frequency isolation transformer T secondary has two windings, and wherein a road is power stage winding, and its output forms high-frequency alternating current, and it obtains direct voltage after rectifying and wave-filtering; An other road is voltage sample winding, by to the collection of transformer secondary voltage, rectification, relatively control after, opening of power switch turn-offed and controlled, making high-frequency ac voltage is constant frequency under setting and the high-frequency ac voltage of constant peak value, and this high-frequency alternating current connects DC bus after the filtering of the uncontrollable rectifier bridge rectifying and voltage-stabilizing of Circuit Fault on Secondary Transformer.
When transformer station exchanges normal power supply and charging device and normally works, because float charge voltage is higher than the output of DC/DC converter, check diode stops DC bus toward DC/DC increasing apparatus power transmission.When ac voltage losing and storage battery open circuit, busbar voltage fast-descending, at this moment DC/DC converter raises cell voltage toward DC bus transmission of electric energy.And then provide direct current for each power consumption equipment.
Than existing transforming plant DC power-supply system, the utlity model has following advantage:
1, the utility model is the redundancy scheme proposing on existing transforming plant DC power-supply system basis, and when original system is normally worked, the device of increase can not affect original system operation.
2, the scheme the utility model proposes can be changed and remove single storage battery is online, has therefore improved useful life and the utilance of battery.
3, it is higher that the scheme the utility model proposes makes transforming plant DC power-supply system compare present power supply reliability.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is embodiment circuit theory diagrams of the present utility model;
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail
No matter transformer station's configuration is a set of or two cover batteries, the redundancy scheme that the utility model provides carries out parallel redundancy to each group storage battery (i.e. this section of bus) respectively.Therefore,, in order to simplify schematic diagram structure, schematic diagram only provides the scheme of one section of bus parallel redundancy.Referring to Fig. 1, the utility model is the redundancy scheme carrying out on current transforming plant DC power-supply system basis, higher to make it reliability.This scheme comprises: the DC/DC promotion pressure ring joint of constant frequency phase shifting control.Its function is when busbar voltage drops to design load, and it is increased to 220V DC bus by cell voltage, and gives each control and living load power supply.Fig. 2 is the boost schematic diagram of DC/DC converter of height.This booster converter main circuit adopts full-bridge topologies, its power switch tube S
1input and power switch tube S
2input be connected with anode again after being connected, power switch tube S
3with power switch tube S
4output be connected with the negative pole of battery again after being connected.Two switching tubes of each brachium pontis are complementary conduction mode, four switching tube diagonal angle conductings simultaneously.For compared with Small Switch Losses, raise the efficiency, reduce EMI noise.Adopt full-bridge constant frequency phase-shifting resonance technology to realize soft switch.Resonant network as shown in Figure 2, power switch tube S
1output and power switch tube S
4input be connected with resonant network input, power switch tube S
2output and power switch tube S
3input be connected with resonant network input.Resonant network output is connected with transformer primary side.Because soft switch technique is relatively ripe, no longer repeat here; Resonant network can adopt second order, three rank and resonant network structures more than three rank, the first end of resonant network output is connected with the first end of the former limit of high-frequency isolation transformer T input, and the second end of its output is connected with the second end of the former limit of high-frequency isolation transformer T input.High-frequency isolation transformer T secondary has two windings, and wherein a road is power stage winding, and its output forms high-frequency alternating current, and it obtains direct voltage after rectifying and wave-filtering.An other road is voltage sample winding, by to the collection of transformer secondary voltage, rectification, relatively control after, opening of power switch turn-offed and controlled, making high-frequency ac voltage is constant frequency under setting and the high-frequency ac voltage of constant peak value, and this high-frequency alternating current connects DC bus after the filtering of the uncontrollable rectifier bridge rectifying and voltage-stabilizing of Circuit Fault on Secondary Transformer.
In sum, this scheme can solve the direct current supply problem of transformer station's ac voltage losing and storage battery open circuit, and when ac voltage losing and certain joint storage battery open circuit, the booster converter at open circuit storage battery place quits work.Other parallel connection boosting module continues as DC bus powered.Therefore, the scheme that the utility model provides can make to continue power supply in the situation of storage battery open circuit and ac voltage losing, stop the generation of DC voltage losing accident, there is the advantages such as simple in structure, cost is low, reliability is high, volume is little, power density is high, therefore there is good practicality.
Above-mentioned enforcement of the present utility model is most of is explanation the utility model example, and it is not the restriction to execution mode of the present utility model.To those of ordinary skill in the art, can also make on the basis of the above description other multi-form variation.Here cannot carry out exhaustive to all execution modes.Everyly belong to apparent variation that the technical solution of the utility model amplifies or change still in protection range value row of the present utility model.
Claims (3)
1. a transforming plant DC power-supply system for multi-channel parallel redundancy, is characterized in that:
DC power system batteries is divided into many groups, and each group storage battery is by current potential height respectively as the input of the DC/DC converter that respectively boosts, and the output of converter connects DC bus by check diode.
2. the transforming plant DC power-supply system of a kind of multi-channel parallel redundancy as claimed in claim 1, is characterized in that:
Described system further comprises following circuit structure:
The high booster converter of DC/DC of constant frequency phase shifting control; This booster converter main circuit adopts full-bridge topologies, its power switch tube S
1input and power switch tube S
2input be connected with anode again after being connected, power switch tube S
3with power switch tube S
4output be connected with the negative pole of battery again after being connected; Two switching tubes of each brachium pontis are complementary conduction mode, four switching tube diagonal angle conductings simultaneously;
Resonant network comprises: power switch tube S
1output and power switch tube S
4input be connected with resonant network input, power switch tube S
2output and power switch tube S
3input be connected with resonant network input; Resonant network output is connected with transformer primary side.
3. the transforming plant DC power-supply system of a kind of multi-channel parallel redundancy as claimed in claim 2, it is characterized in that: resonant network adopts second order, three rank or resonant network structures more than three rank, the first end of resonant network output is connected with the first end of the former limit of high-frequency isolation transformer T input, and the second end of its output is connected with the second end of the former limit of high-frequency isolation transformer T input; High-frequency isolation transformer T secondary has two windings, and wherein a road is power stage winding, and its output forms high-frequency alternating current, and it obtains direct voltage after rectifying and wave-filtering; An other road is voltage sample winding, by to the collection of transformer secondary voltage, rectification, relatively control after, opening of power switch turn-offed and controlled, making high-frequency ac voltage is constant frequency under setting and the high-frequency ac voltage of constant peak value, and this high-frequency alternating current connects DC bus after the filtering of the uncontrollable rectifier bridge rectifying and voltage-stabilizing of Circuit Fault on Secondary Transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420157488.4U CN203859583U (en) | 2014-04-01 | 2014-04-01 | Multipath parallel redundant substation DC power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420157488.4U CN203859583U (en) | 2014-04-01 | 2014-04-01 | Multipath parallel redundant substation DC power supply system |
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| CN203859583U true CN203859583U (en) | 2014-10-01 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602689A (en) * | 2016-10-21 | 2017-04-26 | 国家电网公司 | System for preventing DC power supply bus voltage failure and operation method thereof |
| CN106787040A (en) * | 2016-12-05 | 2017-05-31 | 深圳市泰昂能源科技股份有限公司 | DC power system |
| CN107482613A (en) * | 2017-08-16 | 2017-12-15 | 国网浙江省电力公司电力科学研究院 | A kind of transformer station direct current system based on DC/DC isolation modules |
| CN108155707A (en) * | 2018-02-01 | 2018-06-12 | 深圳奥特迅电力设备股份有限公司 | A kind of DC bus powered system and its control method |
| CN112366474A (en) * | 2020-10-31 | 2021-02-12 | 贵州电网有限责任公司 | Series-parallel hybrid power supply direct-current power supply system |
| CN114188932A (en) * | 2021-10-25 | 2022-03-15 | 广西电网有限责任公司玉林供电局 | Intelligent bus coupler applied to station direct-current power supply system |
| CN115001114A (en) * | 2022-07-19 | 2022-09-02 | 深圳奥特迅电力设备股份有限公司 | Circuit, control method and system for maintaining battery group voltage balance |
-
2014
- 2014-04-01 CN CN201420157488.4U patent/CN203859583U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602689A (en) * | 2016-10-21 | 2017-04-26 | 国家电网公司 | System for preventing DC power supply bus voltage failure and operation method thereof |
| CN106602689B (en) * | 2016-10-21 | 2024-03-01 | 国家电网公司 | A system for preventing DC power bus from losing voltage and its operation method |
| CN106787040A (en) * | 2016-12-05 | 2017-05-31 | 深圳市泰昂能源科技股份有限公司 | DC power system |
| CN107482613A (en) * | 2017-08-16 | 2017-12-15 | 国网浙江省电力公司电力科学研究院 | A kind of transformer station direct current system based on DC/DC isolation modules |
| CN108155707A (en) * | 2018-02-01 | 2018-06-12 | 深圳奥特迅电力设备股份有限公司 | A kind of DC bus powered system and its control method |
| CN112366474A (en) * | 2020-10-31 | 2021-02-12 | 贵州电网有限责任公司 | Series-parallel hybrid power supply direct-current power supply system |
| CN112366474B (en) * | 2020-10-31 | 2021-12-03 | 贵州电网有限责任公司 | Series-parallel hybrid power supply direct-current power supply system |
| CN114188932A (en) * | 2021-10-25 | 2022-03-15 | 广西电网有限责任公司玉林供电局 | Intelligent bus coupler applied to station direct-current power supply system |
| CN115001114A (en) * | 2022-07-19 | 2022-09-02 | 深圳奥特迅电力设备股份有限公司 | Circuit, control method and system for maintaining battery group voltage balance |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141001 Termination date: 20160401 |
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| CF01 | Termination of patent right due to non-payment of annual fee |