CN104124882A - Variable-frequency and variable-voltage multi-level high-power voltage source - Google Patents
Variable-frequency and variable-voltage multi-level high-power voltage source Download PDFInfo
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- CN104124882A CN104124882A CN201410256659.3A CN201410256659A CN104124882A CN 104124882 A CN104124882 A CN 104124882A CN 201410256659 A CN201410256659 A CN 201410256659A CN 104124882 A CN104124882 A CN 104124882A
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Abstract
The invention relates to a variable-frequency and variable-voltage multi-level high-power voltage source. The variable-frequency and variable-voltage multi-level high-power voltage source comprises a first PWM (Pulse Width Modulation) inverter, a second PWM inverter, a first direct-current power supply and a second direct-current power supply, wherein the input ends of the first and second PWM inverters are connected with the output ends of the first and second direct-current power supply respectively; the output ends of the first and second PWM inverters are connected with the head and tail ends of a primary winding of a transformer after passing through a three-phase filter respectively. The voltage of the voltage source can be controlled flexibly, a large voltage vector can be generated through a single set of inverter, and low voltage is generated by controlling an included angle between two voltage vectors till the voltage is zero, thereby realizing high voltage accuracy and low harmonic waves during low-voltage output of the voltage source. When two sets of inverters are consistent in frequency, variable-frequency voltage can be output by controlling the frequency; when the two sets of inverters are inconsistent in frequency, mixed-frequency voltage output can be generated.
Description
technical field
The present invention relates to a kind of large power, electrically potential source, specifically, relate to a kind of improvement of large power, electrically potential source topological structure of variable ratio frequency changer transformation.
Background technology
The existing application more widely in the inverter voltage source of three-phase variable ratio frequency changer transformation, adopts single cover inverters to realize more, and its basic structure mainly comprises the parts such as DC source, PWM inverter, filter circuit, directly or export by transformer.
It is directly to adopt three-phase full-bridge inverter to realize three-phase alternating current output that inverter is realized the simplest scheme of three-phase alternating current output, using the three-phase output of three-phase PWM inverter respectively as A, B, C three-phase, this topologies is comparatively ripe, control simple and reliable, but for low voltage or no-voltage output, because the setting of controllable semiconductor device in inverter (such as IGBT) dead band, minimum turn-on and turn-off time etc., during low-voltage output, voltage accuracy is very poor, harmonic wave is large.
summary of the invention
Technical problem to be solved by this invention is, overcomes the above-mentioned defect of prior art, and a kind of many level Large Powers voltage source of variable ratio frequency changer transformation is provided.
In order to solve above technical problem, the technical solution used in the present invention is as follows:
A kind of many level Large Powers voltage source of variable ratio frequency changer transformation, comprise: a PWM inverter and the 2nd PWM inverter, and first DC power supply and the second DC power supply, the input of described first, second PWM inverter is connected with the output of first, second DC power supply respectively, the output of first, second PWM inverter accesses respectively the first and last end of transformer primary side winding after Three-phase electric-wave filter, between described the first DC power supply both positive and negative polarity, be connected with the first filter capacitor, between described the second DC power supply both positive and negative polarity, be connected with the second filter capacitor.
The present invention also has following further improvement:
1, described transformer is three-phase transformer or three transformer group that single-phase transformer forms.
2, described the first DC power supply can be in parallel with the second DC power supply, or altogether, or independent mutually.
3, a described PWM inverter, the 2nd PWM inverter are a kind of in two level three-phase PWM inverters or three level three-phase PWM inverters.
4, described Three-phase electric-wave filter is LC Three-phase electric-wave filter, and the three phase capacitance of LC Three-phase electric-wave filter is Y-connection or Angle connection.
5, described Three-phase electric-wave filter is LCL Three-phase electric-wave filter, and the three phase capacitance of LCL Three-phase electric-wave filter is Y-connection or Angle connection.
6, the present invention also has PWM controller, and described PWM controller has two groups of control signal outputs, controls respectively described first, second PWM inverter.
The present invention has two cover inverters, connects respectively the first and last end of transformer primary side winding, and it is poor that its winding voltage is two inverter output potentials.When two cover inverter output voltage phase places are identical, when amplitude is identical, transformer input winding both end voltage is identical, and electrical potential difference is zero, and output voltage is zero; If voltage magnitude is identical, when phase place has less difference, can obtain low voltage.By controller, control Voltage-output phase place and the amplitude of two cover inverters, just can obtain the voltage of demand.When the output frequency of two-way inverter is consistent, by control frequency, can produce frequency conversion voltage; When both output frequencies are inconsistent, can produce folded voltage frequently.
With respect to prior art, the present invention has following beneficial effect:
1, the present invention is a kind of voltage with multiple levels source, output phase voltage can be for three level, four level or five level be (when phase voltage is three level, line voltage is five level: at Transformer Winding two ends, access in symmetrical two-level inverter situation, can obtain 9 kinds of different output voltages, if the DC bus-bar voltage of two-level inverter is Ud, these 9 kinds of output voltages are respectively ± Ud, ± 4Ud/3, ± 2Ud/3, ± Ud/3,0, line voltage obtains 5 kinds of different output levels, be respectively ± Ud, ± 2Ud, 0).
2, the voltage-regulation of power supply is controlled flexibly, and the voltage vector that can produce by two cover inverters, carries out voltage-regulation by vector synthesis.Such as can be by regulating the voltage vector size of every cover inverter to carry out voltage control, also can be by regulating the voltage vector angle of two cover inverters to carry out voltage control.
3, this voltage source can overlap inverter by list and generates larger voltage vector, then by the angle of two kinds of voltage vectors, controls, and generates lower voltage, until no-voltage, so this voltage source when low-voltage output, voltage accuracy is high, harmonic wave is little.
4,, when two inverter output frequencies are different, produce folded Voltage-output frequently; When the output frequency of two inverters is consistent, by change frequency simultaneously, carry out frequency conversion Voltage-output.
5, a set of inverter can be done first-harmonic output, another set of as harmonic oscillator, the application of having widened this voltage source.
The present invention relates to the improvement to large power, electrically potential source topological structure, the beneficial effect that this topological structure brings does not rely on software or inverter control method and realizes.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Fig. 2 is two level three-phase PWM inverter electrical schematic diagrams.
Fig. 3 is three level three-phase PWM inverter electrical schematic diagrams.
Fig. 4 is the LC Three-phase electric-wave filter electrical schematic diagram that electric capacity is Y-connection.
Fig. 5 is the LC Three-phase electric-wave filter electrical schematic diagram that electric capacity is Angle connection.
Fig. 6 is the LCL Three-phase electric-wave filter electrical schematic diagram that electric capacity is Y-connection.
Fig. 7 is the LCL Three-phase electric-wave filter electrical schematic diagram that electric capacity is Angle connection.
Fig. 8-Figure 11 transformer primary side winding phase voltage vector composite diagram.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described.
As shown in Figure 1, many level Large Powers voltage source of a kind of variable ratio frequency changer transformation that the present embodiment provides, comprise: a PWM inverter 1 and the 2nd PWM inverter 2, and first DC power supply E1 and the second DC power supply E2, the one PWM inverter 1, the input of the 2nd PWM inverter 2 respectively with the first DC power supply E1, the output of the second DC power supply E2 connects, the one PWM inverter 1, the output of the 2nd PWM inverter 2 is respectively through the first Three-phase electric-wave filter 3, the first and last end of the former limit winding of the rear access transformer 5 of the second Three-phase electric-wave filter 4, between the first DC power supply E1 both positive and negative polarity, be connected with the first filter capacitor C1, between the second DC power supply E2 both positive and negative polarity, be connected with the second filter capacitor C2.
The direct current of DC power supply output is inputted PWM inverter after capacitor filtering, PWM inverter inverse of the DC into AC, by exporting after Three-phase electric-wave filter filtering, according to the requirement of actual required voltage, (by PWM inverter controller) control inverter output frequency, amplitude and the certain alternating voltage of phase place.Transformer time limit winding can be connected into star-like or angle type, by controlling frequency, amplitude and the phase place of two-way inverter output voltage, the adjustable three-phase voltage of output voltage and frequency.
What the present embodiment the one PWM inverter, the 2nd PWM inverter adopted is two level three-phase PWM inverters as shown in Figure 2.In addition, can also select three level three-phase PWM inverters as shown in Figure 3.In two inverters in this voltage source, all right a set of employing two level structures, a set of employing three level structures, version can combination in any.When two cover inverters adopt two level structures simultaneously, output voltage is three level; When a set of employing two level structures, during a set of employing three level structure, output voltage is four level in addition; When two cover power supplys adopt three level structures simultaneously, output voltage is five level.
The conceptual scheme of the present embodiment inversion output Three-phase electric-wave filter as shown in Figure 4, is LC Three-phase electric-wave filter, and the three phase capacitance of this LC Three-phase electric-wave filter is Y-connection form, in addition, can also adopt electric capacity to be as shown in Figure 5 the LC Three-phase electric-wave filter of Angle connection; Or adopt electric capacity to be as shown in Figure 6 the LCL Three-phase electric-wave filter of Y-connection; Or adopt electric capacity to be as shown in Figure 7 the LCL Three-phase electric-wave filter of Angle connection.
When if the voltage of two DC power supply equates, two DC power supply can in parallelly be used, or having jointly current potential uses, and can be also two completely independently DC power supply uses; When if the voltage of DC power supply is unequal, two-way DC source can be independent, also can be total to earth potential and use.
Two overlap inverter output voltages, connect respectively the first and last end of transformer primary side winding, and it is poor that its winding voltage is two inverter output potentials, and voltage vector composite diagram is referring to Fig. 8-Figure 11.In figure, u ' is the phase voltage of the first branch road output, and u ' ' is the phase voltage of the second branch road output, the phase voltage that u is transformer primary side.
What in Fig. 8, export is low-voltage, and what in Fig. 9, export is no-voltage, and what in Figure 10, export is larger voltage; What Figure 11 exported is maximum voltage.
Finally be necessary described herein: foregoing is only for being described in further detail technical scheme of the present invention; can not be interpreted as limiting the scope of the invention, some nonessential improvement that those skilled in the art's foregoing according to the present invention is made and adjustment all belong to protection scope of the present invention.
Claims (7)
1. many level Large Powers voltage source of a variable ratio frequency changer transformation, it is characterized in that, comprise: a PWM inverter and the 2nd PWM inverter, and first DC power supply and the second DC power supply, described first, the input of the 2nd PWM inverter is respectively with first, the output of the second DC power supply connects, first, the output of the 2nd PWM inverter accesses respectively the first and last end of transformer primary side winding after Three-phase electric-wave filter, between described the first DC power supply both positive and negative polarity, be connected with the first filter capacitor, between described the second DC power supply both positive and negative polarity, be connected with the second filter capacitor.
2. many level Large Powers voltage source according to claim 1, is characterized in that: described transformer is three-phase transformer or three transformer group that single-phase transformer forms.
3. many level Large Powers voltage source according to claim 1, is characterized in that: described the first DC power supply is in parallel with the second DC power supply, or altogether, or independent mutually.
4. many level Large Powers voltage source according to claim 1, is characterized in that: a described PWM inverter, the 2nd PWM inverter are a kind of in two level three-phase PWM inverters or three level three-phase PWM inverters.
5. many level Large Powers voltage source according to claim 1, is characterized in that: described Three-phase electric-wave filter is LC Three-phase electric-wave filter, and the three phase capacitance of LC Three-phase electric-wave filter is Y-connection or Angle connection.
6. many level Large Powers voltage source according to claim 1, is characterized in that: described Three-phase electric-wave filter is LCL Three-phase electric-wave filter, and the three phase capacitance of LCL Three-phase electric-wave filter is Y-connection or Angle connection.
7. many level Large Powers voltage source according to claim 1, is characterized in that: also have PWM controller, described PWM controller has two groups of control signal outputs, controls respectively described first, second PWM inverter output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410256659.3A CN104124882A (en) | 2014-06-10 | 2014-06-10 | Variable-frequency and variable-voltage multi-level high-power voltage source |
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| CN201410256659.3A CN104124882A (en) | 2014-06-10 | 2014-06-10 | Variable-frequency and variable-voltage multi-level high-power voltage source |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300947A (en) * | 2016-10-18 | 2017-01-04 | 上海电动工具研究所（集团）有限公司 | Bank electricity is pressed many level Large Powers variable-frequency power sources |
| CN109061248A (en) * | 2018-06-13 | 2018-12-21 | 西安石油大学 | It is a kind of can Spline smoothing DC test power supply implementation method and circuit |
| CN110495088A (en) * | 2017-04-13 | 2019-11-22 | 松下知识产权经营株式会社 | Inverter power supply device |
| CN111082642A (en) * | 2019-12-23 | 2020-04-28 | 科华恒盛股份有限公司 | Power supply network and multi-level circuit thereof and combined multi-level circuit |
| CN111953192A (en) * | 2020-08-11 | 2020-11-17 | 珠海万力达电气自动化有限公司 | High-power inverter power supply and control method thereof |
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| US5051684A (en) * | 1990-01-05 | 1991-09-24 | Asea Brown Boveri Ab | Three-phase voltage stiff convertor |
| CN1894845A (en) * | 2003-12-16 | 2007-01-10 | Abb瑞士有限公司 | Converter circuit with two partial converters |
| US20070121353A1 (en) * | 2005-11-30 | 2007-05-31 | Zhang Richard S | Power converter system and method |
| CN101295958A (en) * | 2007-04-23 | 2008-10-29 | 通用汽车环球科技运作公司 | Inverter topology for an electric motor |
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2014
- 2014-06-10 CN CN201410256659.3A patent/CN104124882A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5051684A (en) * | 1990-01-05 | 1991-09-24 | Asea Brown Boveri Ab | Three-phase voltage stiff convertor |
| CN1894845A (en) * | 2003-12-16 | 2007-01-10 | Abb瑞士有限公司 | Converter circuit with two partial converters |
| US20070121353A1 (en) * | 2005-11-30 | 2007-05-31 | Zhang Richard S | Power converter system and method |
| CN101295958A (en) * | 2007-04-23 | 2008-10-29 | 通用汽车环球科技运作公司 | Inverter topology for an electric motor |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300947A (en) * | 2016-10-18 | 2017-01-04 | 上海电动工具研究所（集团）有限公司 | Bank electricity is pressed many level Large Powers variable-frequency power sources |
| CN106300947B (en) * | 2016-10-18 | 2019-11-19 | 上海电动工具研究所（集团）有限公司 | Bank electricity presses more level Large Power variable-frequency power sources in |
| CN110495088A (en) * | 2017-04-13 | 2019-11-22 | 松下知识产权经营株式会社 | Inverter power supply device |
| CN109061248A (en) * | 2018-06-13 | 2018-12-21 | 西安石油大学 | It is a kind of can Spline smoothing DC test power supply implementation method and circuit |
| CN111082642A (en) * | 2019-12-23 | 2020-04-28 | 科华恒盛股份有限公司 | Power supply network and multi-level circuit thereof and combined multi-level circuit |
| CN111082642B (en) * | 2019-12-23 | 2022-03-11 | 科华恒盛股份有限公司 | Power supply network and multi-level circuit thereof and combined multi-level circuit |
| CN111953192A (en) * | 2020-08-11 | 2020-11-17 | 珠海万力达电气自动化有限公司 | High-power inverter power supply and control method thereof |
| CN111953192B (en) * | 2020-08-11 | 2024-06-14 | 珠海万力达电气自动化有限公司 | High-power inverter power supply and control method thereof |
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