CN104796006A - Same-phase power supply system based on single-phase full-bridge diode clamping multilevel back-to-back converter - Google Patents
Same-phase power supply system based on single-phase full-bridge diode clamping multilevel back-to-back converter Download PDFInfo
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- CN104796006A CN104796006A CN201510180920.0A CN201510180920A CN104796006A CN 104796006 A CN104796006 A CN 104796006A CN 201510180920 A CN201510180920 A CN 201510180920A CN 104796006 A CN104796006 A CN 104796006A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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Abstract
The invention discloses a same-phase power supply system based on a single-phase full-bridge diode clamping multilevel back-to-back converter. A secondary winding of an alpha-phase step-down transformer (2) is parallelly connected with an input end of a diode clamping multilevel rectifier through a connecting reactor (5), an output end of the diode clamping multilevel rectifier is parallelly connected with a second winding of a beta-phase step-down transformer (3) through a connecting reactor (5), and parallel output is connected in a traction network to power a load; a signal controller (7) mainly collects load current I load, phase signals of alpha-phase voltage and beta-phase voltage and voltage Vdc of a direct-current side capacitor, and current I alpha and I beta is controlled to be equal through a control circuit, so that balance of three-phase current on a network side is guaranteed. When the same-phase power supply system is applied in high-voltage high-power places, switch stress borne by devices can be lowered, switch loss of the devices is reduced, du/dt, di/dt and output waveform harmonic content during circuit running are lowered, capacity, grade and efficiency of the circuit are improved, and functions of the circuit are enabled to be more advantageous; the whole system is enabled to be small in loss and long in service life, so that maintenance frequency is lowered greatly.
Description
Technical field
The present invention relates to a kind of cophase supply system based on the many level of single-phase full bridge diode clamp converter back-to-back.
Background technology
The traction load of electric railway is single phase alternating current (A.C.) load, makes tractive power supply system severe three-phase uneven, and there is reactive current.In order to reduce the impact of three-phase imbalance, balancing transformer adopts Commutating connect, causes each power supply segment voltage different like this, so must separate with neutral section insulator.Neutral section insulator limits locomotive and is smoothly flowed continuously, has become the weak link of power supply, has constrained the development of high speed, heavy haul railway.And cophase supply technology, fundamentally solve electric phase-splitting problem, by the comprehensive compensation electric current of real-time detecting system, control active filter, balance three-phase, filtering reactive current, makes the former limit no longer rotation of balancing transformer.Under the effect of compensation arrangement, solve the three-phase imbalance problem of system, compensate for idle and harmonic wave simultaneously.In tradition cophase supply system, adopt the structure of single-phase full bridge two level converter back-to-back, electric phase-splitting can be avoided, realize three-phase equilibrium, compensating reactive power, harmonic wave.In recent years, in commercial Application, the demand of high-capacity power convertor device is increased day by day, two traditional level converters are in high-voltage large-capacity application, except minority occasion adopts AC/AC (alternating current) variable-frequency mode, low pressure low capacity converter is obtained high-power by adopting the technology of multiplex by usual employing, or adopt transformer buck, intermediate link or low-tension transformer in interchange input and output side.The problems such as these two kinds of modes all have employed the transformer of heaviness, costliness, power consumption, and it is excessive that the latter there will be intermediate link electric current, decrease in efficiency, and reliability reduces, Energy Transfer difficulty.And two level circuits, in order to obtain high-quality output waveform, improve switching frequency, switch can be made like this to have very large loss, and have very large du/dt and surge voltage.For two level back-to-back converter, the harmonic wave of output voltage content of many level converter is back-to-back few, close to sine wave, waveform quality obviously will be got well, and achieves the raising of efficiency, simultaneously, if N level converter, then many level direct voltage V in converter back-to-back
dshared by N-1 switching device, the magnitude of voltage that switching device is born reduces, and is applicable to powerful occasion.For full bridge structure, also can make that system loss is little, the life-span is long, maintenance rate reduces greatly.
Summary of the invention
The object of this circuit design be by many for single-phase full bridge diode clamp level back-to-back converter be used for cophase supply system, improve capacity and the electric pressure of circuit, make circuit working more stable, circuit function advantageously and system loss is little, the life-span is long, maintenance rate reduces greatly.
This circuit structure solves the existing problems of current stage, and the technical scheme adopted is:
A kind of cophase supply system based on the many level of single-phase full bridge diode clamp converter back-to-back, comprise balancing transformer 1, α phase step-down transformer 2, β phase step-down transformer 3, α are connected reactance 4, β is connected reactance 5, the many level of single-phase full bridge converter 6 back-to-back, wherein:
A, balancing transformer 1 input L
a, L
b, L
cmeet a of three phase network respectively, b, c three-phase, export α, β two-phase, α phase exports and is connected with step-down transformer 2 windings, and β phase exports and is connected with step-down transformer 3 windings; The many level of single-phase full bridge back-to-back converter 6 are made up of back-to-back diode clamp multi-level rectifier and diode clamp multi-electrical level inverter; α phase step-down transformer 2 secondary winding is in parallel with the input of diode clamp multi-level rectifier through connecting reactance 4, diode clamp multi-electrical level inverter output is in parallel with β phase step-down transformer 3 secondary winding through connecting reactance 5, Parallel opertation access Traction networks is load supplying;
B, signal control circuit 7 mainly gather load current I
load, the phase signal of α and β two phase voltage and DC capacitor voltage V
dc, produce by predictive-current control method the switch on and off that PWM drive singal controls converter 6, thus make electric current two-arm electric current I
α, I
βequal, ensure net side three-phase balance.
Compared with prior art, the beneficial effect of the design's circuit is: the many level of single-phase full bridge back-to-back converter topology due to the advantage of self structure, under switching device bears relative two level block N/mono-pressure drops (N is level number) and lower switching frequency situation, obtain identical with two level or better waveform.When many level topologys are applied in high-power occasion, reduce the switch stress that device bears on the one hand, reduce the switching loss of device; On the other hand reduce circuit operating du/dt, di/dt and output waveform harmonic content, simultaneously due to the advantage of the stability of full-bridge, make that whole system loss is little, the life-span is long, maintenance rate reduces greatly.Therefore, in cophase supply system, adopt the structure of single-phase full bridge many level back-to-back converter, improve circuit capacity and electric pressure, make circuit function advantageously.
Be described in further detail the design is novel below in conjunction with the drawings and specific embodiments.
Accompanying drawing explanation
Fig. 1 briefly schemes based on the cophase supply system of the many level of single-phase full bridge diode clamp converter back-to-back.
Fig. 2 is the cophase supply system based on single-phase full bridge diode clamp three level converter back-to-back.
Fig. 3 is the structure chart of single-phase full bridge diode clamp multi-level converter.
Fig. 4 is that native system is gained merit, the fundamental block diagram of idle, harmonic detecting.
Fig. 5 is the control block diagram of native system predictive-current control method.
Embodiment
The present invention is applied to the many level of the single-phase full bridge diode clamp converter back-to-back in cophase supply system.Comprise balancing transformer 1, α phase step-down transformer 2, β phase step-down transformer 3, α be connected reactance 4, β is connected reactance 5, many Level Full Bridges diode clamp is single-phase-single-phase invertor 6 (see Fig. 1).For single-phase full bridge diode clamp three level converter (see Fig. 2) back-to-back, wherein:
A, balancing transformer 1 input L
a, L
b, L
cmeet a of three phase network respectively, b, c three-phase, export α, β two-phase, α phase exports and is connected with step-down transformer 2 windings, and β phase exports and is connected with step-down transformer 3 windings; Single-phase full bridge three level back-to-back converter 6 is made up of back-to-back diode clamp three-level rectifier and Diode Clamping Three-Level Inverter; α phase step-down transformer 2 secondary winding is in parallel with the input of diode clamp three-level rectifier through connecting reactance 4, Diode Clamping Three-Level Inverter output is in parallel with β phase step-down transformer 3 secondary winding through connecting reactance 5, Parallel opertation access Traction networks is load supplying.
B, suppose that the level number of converter output voltage is back-to-back N (N >=3), N level single-phase full bridge back-to-back converter is made up of N level rectifier and N electrical level inverter, is respectively two brachium pontis.Then the number of DC partial voltage electric capacity is N-1, and the series connection number of each brachium pontis master power switch pipe is that 2* (N-1) is individual, and the number of clamp diode is that 2* (N-2) is individual.The input a of its N level rectifier
n1-a
n2in parallel with the secondary winding of the step-down transformer of α phase through connecting reactance; The output b of its N electrical level inverter
n1-b
n2in parallel with β phase step-down transformer secondary winding through connecting reactance, and β phase step-down transformer secondary winding access Traction networks, be load supplying.(see Fig. 3)
Embodiment:
Fig. 1 illustrates, a kind of embodiment of the present invention is: a kind of cophase supply system based on the many level of single-phase full bridge diode clamp converter back-to-back, comprises balancing transformer 1, α phase step-down transformer 2, β phase step-down transformer 3, α are connected reactance 4, β is connected reactance 5, the many level of single-phase full bridge diode clamp converter 6 back-to-back.Wherein:
The input L of balancing transformer (1)
a, L
b, L
crespectively from a of three phase network, the power taking of b, c three-phase, export α, β two-phase, α phase exports and is connected with step-down transformer 2 windings, and β phase exports and is connected with step-down transformer 3 windings.Its many level single-phase full bridge back-to-back converter 6 is made up of back-to-back diode clamp multi-level rectifier and diode clamp multi-electrical level inverter.The secondary winding of α phase step-down transformer 2 is in parallel with the input of diode clamp multi-level rectifier through connecting reactance 4, diode clamp multi-electrical level inverter output is in parallel with the secondary winding of β phase step-down transformer 3 through connecting reactance 5, Parallel opertation access Traction networks is load supplying.
The testing process (see Fig. 4) of meritorious, idle in signal controller 7, harmonic wave: V
reffor DC capacitor voltage set-point, V
dcfor DC capacitor voltage actual value.The input L of balancing transformer 1
a, L
b, L
crespectively from a, b, c three-phase power taking of three phase network, export α, β two-phase, now α phase voltage is equal with β phase voltage, and phase 90 °, the secondary winding of α phase step-down transformer 2 is in parallel with the input of diode clamp multi-level rectifier through connecting reactance 4, and diode clamp multi-electrical level inverter output is in parallel with the secondary winding of β phase step-down transformer 3 through connecting reactance 5.Load current I
loadby active current i
p, reactive current i
qbecome with harmonic wave set of currents, obtain α, β two phase voltage V by phase-locked loop
αwith V
βphase angle, load current I
loadbe multiplied by V respectively
αwith V
βafter the sine of phase place and cosine value, by low pass filter, obtain the active current value of load current half and the reactive current value of half, deduct total meritorious and reactive current with load current and namely obtain harmonic current value.Control converter switches, make β phase brachium pontis export active current, all reactive current and the harmonic current of half; The active current of α phase brachium pontis input half, is converted to a part of access control of given electric current simultaneously, thus ensures the constant of DC voltage by DC voltage.The meritorious energy of this converter is back-to-back double-direction control, and idle is that β brachium pontis independently controls with harmonic wave, thus compensating load is idle and harmonic current, and the biphase current that balancing transformer 1 is exported is equal, finally realizes the stable of net side three-phase voltage.
The course of work (see Fig. 5) of PWM drive singal is produced by predictive-current control: adopt predictive-current control method, in a PWM switch periods T, make actual current on line side i in signal controller 7
n(t+T) and instruction current i
*t () is equal, thus produce PWM drive singal, controls the switching tube break-make of converter (6).
Claims (1)
1., based on a cophase supply system for the many level of single-phase full bridge diode clamp converter back-to-back, comprise balancing transformer (1), α phase step-down transformer (2), β phase step-down transformer (3), α are connected reactance (4), β is connected reactance (5), the many level of single-phase full bridge converter (6) back-to-back; It is characterized in that:
A, balancing transformer (1) input L
a, L
b, L
cmeet a of three phase network respectively, b, c three-phase, export α, β two-phase, α phase exports and is connected with step-down transformer (2) windings, and β phase exports and is connected with step-down transformer (3) windings; The many level of single-phase full bridge back-to-back converter (6) are made up of back-to-back diode clamp multi-level rectifier and diode clamp multi-electrical level inverter; α phase step-down transformer (2) secondary winding is in parallel with the input of diode clamp multi-level rectifier through connecting reactance (4), diode clamp multi-electrical level inverter output is in parallel with β phase step-down transformer (3) secondary winding through connecting reactance (5), Parallel opertation access Traction networks is load supplying;
B, signal control circuit (7) mainly gather load current I
load, the phase signal of α and β two phase voltage and DC capacitor voltage V
dc, produce by predictive-current control method the switch on and off that PWM drive singal controls converter (6), thus make electric current two-arm electric current I
α, I
βequal, ensure net side three-phase balance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510180920.0A CN104796006A (en) | 2015-04-16 | 2015-04-16 | Same-phase power supply system based on single-phase full-bridge diode clamping multilevel back-to-back converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510180920.0A CN104796006A (en) | 2015-04-16 | 2015-04-16 | Same-phase power supply system based on single-phase full-bridge diode clamping multilevel back-to-back converter |
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| Publication Number | Publication Date |
|---|---|
| CN104796006A true CN104796006A (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510180920.0A Pending CN104796006A (en) | 2015-04-16 | 2015-04-16 | Same-phase power supply system based on single-phase full-bridge diode clamping multilevel back-to-back converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114033A (en) * | 2021-05-18 | 2021-07-13 | 西南交通大学 | Direct-current-side secondary ripple suppression device for traction transmission system and control method |
Citations (3)
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|---|---|---|---|---|
| CN102166969A (en) * | 2011-03-17 | 2011-08-31 | 许继集团有限公司 | Electrified railway in-phase power supply device and multi-target coordinated instantaneous current control method |
| EP2557675A1 (en) * | 2011-08-08 | 2013-02-13 | Siemens Aktiengesellschaft | Direct electrical heating arrangement comprising a transformer and an indirect voltage link a.c. converter |
| CN204578379U (en) * | 2015-04-16 | 2015-08-19 | 西南交通大学 | A kind of cophase supply system based on the many level of single-phase full bridge diode clamp converter back-to-back |
-
2015
- 2015-04-16 CN CN201510180920.0A patent/CN104796006A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166969A (en) * | 2011-03-17 | 2011-08-31 | 许继集团有限公司 | Electrified railway in-phase power supply device and multi-target coordinated instantaneous current control method |
| EP2557675A1 (en) * | 2011-08-08 | 2013-02-13 | Siemens Aktiengesellschaft | Direct electrical heating arrangement comprising a transformer and an indirect voltage link a.c. converter |
| CN204578379U (en) * | 2015-04-16 | 2015-08-19 | 西南交通大学 | A kind of cophase supply system based on the many level of single-phase full bridge diode clamp converter back-to-back |
Non-Patent Citations (2)
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| 夏焰坤 等: ""基于瞬时无功理论和平衡变压器的牵引变电所电流平衡补偿方法"", 《 电力自动化设备》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113114033A (en) * | 2021-05-18 | 2021-07-13 | 西南交通大学 | Direct-current-side secondary ripple suppression device for traction transmission system and control method |
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Application publication date: 20150722 |