CN104092270A - Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof - Google Patents
Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof Download PDFInfo
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- CN104092270A CN104092270A CN201410249223.1A CN201410249223A CN104092270A CN 104092270 A CN104092270 A CN 104092270A CN 201410249223 A CN201410249223 A CN 201410249223A CN 104092270 A CN104092270 A CN 104092270A
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- winding
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- charging station
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a direct-current power supply system applicable to pure electric bus charging stations and a charging station thereof. The direct-current power supply system comprises a three-phase power grid which is connected with a primary winding of a harmonic shielding transformer. A secondary winding of the harmonic shielding transformer is connected with a rectifier module and a filter. A static var generator is connected in parallel between the three-phase power grid and the primary winding of the harmonic shielding transformer. Pure electric bus charging station filtering and reactive power compensation are realized, the harmonic content of the pure electric bus charging station is reduced, and the power factor of the pure electric bus charging station is improved.
Description
Technical field
The present invention relates to supplying electricity and power distribution field, be specifically related to a kind of Novel DC electric power system and charging station thereof that is applicable to pure Electric Transit charging station, to realize the filtering of charging station and reactive power compensation.
Background technology
Pure electric bus charging station adopts high-power high-frequency charger, three-phase current input is through the uncontrollable rectifier bridge rectification of the inner three-phase of charger, after filtering, for high-frequency DC-DC power circuit provides direct current input, pure electric bus power battery charging is given in the output of power conversion circuit after output filtering.Pure electric bus high-power high-frequency charger is with typical nonlinear-load, contain a large amount of power electronic device, power electronic device unintentional nonlinearity characteristic, when its access using electricity system, inevitably causes that harmonic pollution is serious, the low inferior problem of power factor.
At present, the Main Means that solves the power quality problem of pure Electric Transit charging station is to install active filter additional in net side.But this filter structure has some limitations.First, active filter is pretended in net side, the net side of harmonic wave and the idle transformer of all flowing through and valve side winding, in the iron core of transformer, pass through stronger harmonic flux, transformer insulated difficulty is strengthened, and heating increases, and it is large that vibration and noise become, loss increases, thereby affects operational efficiency and the stability thereof of system.Secondly, active filter cost of investment is high.
Summary of the invention
Technical problem to be solved by this invention is, not enough for prior art, a kind of DC power-supply system and charging station thereof that is applicable to pure Electric Transit charging station is provided, realize the filtering of pure Electric Transit charging station and reactive power compensation, reduce the harmonic content of pure Electric Transit charging station, improve its power factor.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of DC power-supply system that is applicable to pure Electric Transit charging station, comprise three phase network, described three phase network is connected with harmonic shielding transformer primary side winding, and described harmonic shielding transformer time limit winding is connected with rectification module, filter; Between the static reacance generator described three phase network of access in parallel and harmonic shielding transformer primary side winding.
Described harmonic shielding transformer can be self coupling type harmonic shielding transformer, and described self coupling type harmonic shielding transformer comprises that net side winding, upper bridge common winding, lower bridge common winding, Shang Qiao prolong limit winding, Xia Qiao prolongs limit winding; Described upper bridge common winding and described upper bridge prolong limit windings in series, and described lower bridge common winding and described lower bridge prolong limit windings in series; Described net side winding is connected with described three phase network, and described upper bridge prolongs limit winding, Xia Qiao prolongs limit winding and accesses described rectification module; The described filter described upper bridge common winding of access in parallel and described upper bridge prolongs between the winding of limit, lower bridge common winding and described lower bridge prolong between the winding of limit; Described rectification module comprises rectifier bridge and lower rectifier bridge, and described upper rectifier bridge, lower rectifier bridge prolong limit winding with described upper bridge respectively, Xia Qiao prolongs limit winding and is connected.
Described harmonic shielding transformer can be also induction type harmonic shielding transformer, and described induction type harmonic shielding transformer comprises that net side winding, upper bridge Y connect winding, lower bridge triangle connects winding, Filter Winding; Described net side winding is connected with described three phase network; Described upper bridge Y connects winding, lower bridge triangle connects winding and accesses described rectification module; Described Filter Winding is connected with described filter; Described rectification module comprises rectifier bridge and lower rectifier bridge, and described upper rectifier bridge, lower rectifier bridge are connected respectively winding with described upper bridge Y, lower bridge triangle connects winding and connects.
Described filter is complete modulation filter.
The present invention also provides a kind of pure Electric Transit charging station, comprises above-mentioned DC power-supply system, and the rectifier bridge of described DC power-supply system is connected with charging device by DC bus.
Compared with prior art, the beneficial effect that the present invention has is: the equivalent impedance of the common winding of self coupling type harmonic shielding transformer of the present invention designs by zero impedance, reach the zero impedance design of winding, in the structural design of transformer, can, by adjusting the parameters such as the layout of Transformer Winding and size, make the equivalent impedance of Filter Winding close to zero.In common winding, connect complete modulation filter; The equivalent impedance of the induction type new harmonic shielded transformer secondary side tertiary winding is by zero impedance design, and it can reach by adjusting the parameters such as the layout of Transformer Winding and size the object of zero equivalent impedance design equally.On the tertiary winding, connect complete modulation filter.Like this, no matter be self coupling type or induction type harmonic shielding transformer, the zero impedance short-circuited conducting sleeve of the characteristic harmonic current that capital produces rectifier bridge, realization is compensation and the inhibition nearby of harmonic wave nearby to reactive power in valve side, allow the harmonics electric current major part filter of flowing through, be unlikely to flee net side and electrical network is caused to harmonic pollution, reach good harmonic suppression effect; Due to harmonic wave with idlely all suppress nearby and compensate in valve side, loss, temperature rise, noise and vibration that this has not only reduced transformer, can also allow whole pure Electric Transit charging station system with High Power Factor and high-efficiency stable operation; Tradition charging station is 6 pulse wave rectifiers, will produce 6k ± 1 (k=1,2,3 ...) inferior characteristic harmonic current, and the invention belongs to 12 pulse wave rectifiers, than 6 pulse wave rectifiers, 12 pulse wave rectifiers only can produce 12k ± 1 (k=1,2,3 ...) inferior characteristic harmonics, effectively reduced the current harmonics resultant distortion rate of net side; Traditional transformer is replaced to harmonic shielding transformer, the harmonic wave major part that rectifier bridge is produced is suppressed at valve side and does not make it flee net side electrical network is polluted, thereby make charging station there is no need to install additional again active filter, reduced the construction cost of charging station; The DC power-supply system that is applicable to pure Electric Transit charging station is powered traditional charging station to change DC bus into charger with ac bus, the DC master row that is equivalent to electrolysis chemical industry, in charging station, all pure Electric Transits are all only born DC-DC power conversion function by the charger being installed between common DC bus and pure Electric Transit, three-phase alternating current is born by 12 public pulse wave rectifier bridges to the rectifying conversion of direct current, so just reduced the platform of energy conversion, also make charger structure simpler, reliability is higher; Public transport charging station DC power-supply system of the present invention shares a public rectifier bridge, and comparing each charger of tradition needs a rectifier bridge, more can raise the efficiency, and reduces loss, also can reduce the construction cost of charging station; After large capacity energy-storage battery technical development, can be on DC bus energy-storage battery in parallel, like this in peak times of power consumption, can directly give charging pure Electric Transit charging with energy-storage battery; The DC power-supply system that is applicable to pure Electric Transit charging station that the present invention proposes is owing to there being public DC bus, more be conducive to the access with distributed new system, because DC load and new energy resources system are connected in parallel on DC bus, reduced the conversion links of energy; Static reacance generator SVG only plays auxiliary inactive power compensation to whole charging station system, being that the major part of whole system operation is idle is provided by filter, only have barbed portion to be supplemented by SVG, compare with general DC power-supply system, greatly reduce the capacity of SVG.
Accompanying drawing explanation
Fig. 1 is the topology diagram of the pure Electric Transit charging station of an embodiment of the present invention self coupling type DC power-supply system composition;
Fig. 2 is the detailed winding diagram of Fig. 1;
Fig. 3 is the topology diagram of the pure Electric Transit charging station of the another kind of embodiment induction type of the present invention DC power-supply system composition;
Fig. 4 is the detailed winding diagram of Fig. 3;
Fig. 5 is the harmonic flux path schematic diagram in transformer core.
Embodiment
Below in conjunction with accompanying drawing explanation the specific embodiment of the present invention.
Fig. 1, Fig. 2 are a kind of DC power-supply system of applicable and pure Electric Transit charging station, and the DC charging system of this embodiment comprises a self coupling type harmonic shielding transformer 3,2, one filters 4 of a set of static reacance generator and two cover three-phase thyristor rectifier bridges 5; Net side winding 7 adopts Y-connection mode incoming transport electrical network 1; Upper bridge prolongs limit winding 11, Xia Qiao prolongs limit winding 12 and all adopts extend-triangle wiring to carry out connecing rectifier bridge 5 after phase shift with common winding; The direct current that rectification obtains forms DC bus-bar voltage, gives pure Electric Transit charging station DC charging system 6 power supplies.After upper bridge common winding 9 and lower bridge common winding 10 parallel connections, connect filter 14.
The DC charging system that Fig. 3, Fig. 4 are comprises an induction type new harmonic shielded transformer 3,2, one filters 4 of a set of static reacance generator and two cover three-phase thyristor rectifier bridges 5; Net side winding 7 adopts Y-connection mode incoming transport electrical network 1; In valve side, bridge Y connects winding 8 to upper rectifier bridge 13 power supplies; Under valve side, bridge triangle connects winding 17 to lower rectifier bridge 15 power supplies; The direct current that upper and lower two rectifier bridge rectifier output voltage parallel connections obtain forms DC bus-bar voltage, gives pure Electric Transit charging station DC charging system 6 power supplies.Filter Winding 16 connects filter 14.
Static reacance generator SVG is the idle Continuous Compensation of carrying out to whole charging station in net side.
The monophase transformer core harmonic flux of take below shielding is research object, utilizes the principle of harmonic wave ampere-turn equilibrium principle explanation new harmonic shielded transformer aspect harmonic wave inhibition.
Fig. 5 is the harmonic flux path schematic diagram in transformer core.When net side winding and Filter Winding are all opened a way, due to n time non-linear the produced characteristic harmonic current I of rectifier bridge
2nby injection valve side winding, and produce harmonic wave magnetomotive force N
2i
2nthereby, in iron core, will produce the harmonic flux φ of alternation
n.Harmonic flux φ
nsimultaneously with net side winding, valve side winding and secondary side Filter Winding (self coupling type new harmonic shielded transformer be net side winding, prolong limit winding, common winding) intersecting chain.According to the law of electromagnetic induction, this magnetic flux will induce respectively harmonic wave electromotive force e in net side winding, valve side winding and secondary side Filter Winding
1n, e
2n, e
3n.And the harmonic wave electromotive force e of net side winding
1nto produce harmonic current I
1n, because the harmonic current of the non-linear generation of valve side rectifier bridge has been fled net side through transformer core.Reach the object of filtering, will eliminate or reduce I
1n, will eliminate or reduce e
1nthereby the harmonic flux that will eliminate or reduce in iron core is φ
n.
Due to harmonic current I
2nbe the periodic signal of alternation, by electromagnetic induction principle, known, harmonic flux φ in iron core
nbe the periodic signal of alternation, can be expressed as:
φ
n＝φ
mncosnωt (1)
Wherein, φ
mnamplitude for nth harmonic magnetic flux.
Harmonic flux φ
nthe harmonic wave electromotive force e inducing in secondary side Filter Winding (self coupling type new harmonic shielded transformer is common winding)
3nfor:
If z
3n, z
fnbe respectively the nth harmonic equivalent impedance of secondary filtering winding (self coupling type new harmonic shielded transformer is common winding) and filter.When the closed input of filter, the voltage equation in harmonic wave loop is:
e
3n＝i
3n(z
3n+z
fn) (3)
According to formula (2), (3), can show that the pass between the harmonic wave equivalent impedance of harmonic flux and filter branch is:
N
3nωφ
mnsin(nωt)＝i
3n(z
3n+z
fn) (4)
To formula (4), if meet the harmonic wave equivalent impedance of secondary filtering winding (self coupling type new harmonic shielded transformer is common winding) and filter, namely z
3n+ z
fnbe zero or close to zero, consider the equation left side, due to N
3, n, ω be one and be greater than zero constant, sin (n ω t) is a time dependent variable, therefore only has φ
mnbe zero or could meet equality condition close to zero.
In practice because filter circuit resistance is very little, the in the situation that of complete modulation, z
3n+ z
fnclose to 0, thus e3n close to 0, thereby can obtain main flux in iron core also close to zero, harmonic wave main flux is effectively shielded, thereby has realized the harmonic shielding to net side winding.
By above analysis, from the harmonic flux inhibition aspect of transformer core, set forth the essence of the harmonic shielding principle of the method.
That is to say, drop into after filter, eliminated the harmonic current of the net side winding of harmonic shielding transformer, the harmful effect of harmonic reduction to transformer.In addition, the impedance of high order harmonics becomes capacitive for first-harmonic, in the time of complete modulation filter filtering harmonic wave, first-harmonic has been carried out to reactive power compensation.
Claims (7)
1. a DC power-supply system that is applicable to pure Electric Transit charging station, comprises three phase network, it is characterized in that, described three phase network is connected with harmonic shielding transformer primary side winding, and described harmonic shielding transformer time limit winding is connected with rectification module, filter; An in parallel access between described three phase network and harmonic shielding transformer primary side winding of static reacance generator.
2. the DC power-supply system that is applicable to pure Electric Transit charging station according to claim 1, it is characterized in that, described harmonic shielding transformer is self coupling type harmonic shielding transformer, and described self coupling type harmonic shielding transformer comprises that net side winding, upper bridge common winding, lower bridge common winding, Shang Qiao prolong limit winding, Xia Qiao prolongs limit winding; Described upper bridge common winding and described upper bridge prolong limit windings in series, and described lower bridge common winding and described lower bridge prolong limit windings in series; Described net side winding is connected with described three phase network, and described upper bridge prolongs limit winding, Xia Qiao prolongs limit winding and accesses described rectification module; The described filter described upper bridge common winding of access in parallel and described upper bridge prolongs between the winding of limit, lower bridge common winding and described lower bridge prolong between the winding of limit.
3. the DC power-supply system that is applicable to pure Electric Transit charging station according to claim 2, it is characterized in that, described rectification module comprises rectifier bridge and lower rectifier bridge, and described upper rectifier bridge, lower rectifier bridge prolong limit winding with described upper bridge respectively, Xia Qiao prolongs limit winding and is connected.
4. the DC power-supply system that is applicable to pure Electric Transit charging station according to claim 1, it is characterized in that, described harmonic shielding transformer is induction type harmonic shielding transformer, and described induction type harmonic shielding transformer comprises that net side winding, upper bridge Y connect winding, lower bridge triangle connects winding, Filter Winding; Described net side winding is connected with described three phase network; Described upper bridge Y connects winding, lower bridge triangle connects winding and accesses described rectification module; Described Filter Winding is connected with described filter.
5. the DC power-supply system that is applicable to pure Electric Transit charging station according to claim 4, it is characterized in that, described rectification module comprises rectifier bridge and lower rectifier bridge, and described upper rectifier bridge, lower rectifier bridge are connected respectively winding with described upper bridge Y, lower bridge triangle connects winding and connects.
6. according to the DC power-supply system that is applicable to pure Electric Transit charging station one of claim 1～5 Suo Shu, it is characterized in that, described filter is complete modulation filter.
7. a pure Electric Transit charging station, is characterized in that, comprises the DC power-supply system described in the claims 6, and the rectifier bridge of described DC power-supply system is connected with charging device by DC bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410249223.1A CN104092270A (en) | 2014-06-06 | 2014-06-06 | Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410249223.1A CN104092270A (en) | 2014-06-06 | 2014-06-06 | Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof |
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| CN104092270A true CN104092270A (en) | 2014-10-08 |
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| CN201410249223.1A Pending CN104092270A (en) | 2014-06-06 | 2014-06-06 | Direct-current power supply system applicable to pure electric bus charging stations and charging station thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466963A (en) * | 2014-12-11 | 2015-03-25 | 湖南大学 | Power induction and regulation filtering device and control method thereof |
| GB2536653A (en) * | 2015-03-24 | 2016-09-28 | Carroll & Meynell Transf Ltd | DC power supply |
| CN106564397A (en) * | 2016-11-07 | 2017-04-19 | 上海泓语电气技术有限公司 | Direct-current charging type charging station system |
| CN110989749A (en) * | 2019-12-24 | 2020-04-10 | 联合汽车电子有限公司 | Silicon controlled rectifier control circuit, system and method |
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| JP2001314079A (en) * | 2000-04-28 | 2001-11-09 | Sony Corp | Switching power supply circuit |
| CN1553553A (en) * | 2003-12-19 | 2004-12-08 | 刘福生 | Rectification transformers with self coupling compensation and resournace shield |
| CN203632255U (en) * | 2013-12-11 | 2014-06-04 | 哈尔滨理工大学 | Three-phase static var generator based on Z source network |
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2014
- 2014-06-06 CN CN201410249223.1A patent/CN104092270A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001314079A (en) * | 2000-04-28 | 2001-11-09 | Sony Corp | Switching power supply circuit |
| CN1553553A (en) * | 2003-12-19 | 2004-12-08 | 刘福生 | Rectification transformers with self coupling compensation and resournace shield |
| CN203632255U (en) * | 2013-12-11 | 2014-06-04 | 哈尔滨理工大学 | Three-phase static var generator based on Z source network |
Non-Patent Citations (1)
| Title |
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| 李勇等: "新型直流输电系统典型谐波分布特性分析", 《新型直流输电系统典型谐波分布特性分析》, vol. 33, no. 10, 25 May 2009 (2009-05-25) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466963A (en) * | 2014-12-11 | 2015-03-25 | 湖南大学 | Power induction and regulation filtering device and control method thereof |
| GB2536653A (en) * | 2015-03-24 | 2016-09-28 | Carroll & Meynell Transf Ltd | DC power supply |
| CN106564397A (en) * | 2016-11-07 | 2017-04-19 | 上海泓语电气技术有限公司 | Direct-current charging type charging station system |
| CN110989749A (en) * | 2019-12-24 | 2020-04-10 | 联合汽车电子有限公司 | Silicon controlled rectifier control circuit, system and method |
| CN110989749B (en) * | 2019-12-24 | 2022-04-05 | 联合汽车电子有限公司 | Silicon controlled rectifier control circuit, system and method |
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Application publication date: 20141008 |