CN102931854A - Cascaded high-voltage inverter - Google Patents
Cascaded high-voltage inverter Download PDFInfo
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- CN102931854A CN102931854A CN2012104112399A CN201210411239A CN102931854A CN 102931854 A CN102931854 A CN 102931854A CN 2012104112399 A CN2012104112399 A CN 2012104112399A CN 201210411239 A CN201210411239 A CN 201210411239A CN 102931854 A CN102931854 A CN 102931854A
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Abstract
The invention discloses a cascaded high-voltage inverter. The high-voltage inverter comprises a phase-shifting transformer, an inverter and a multi-position selector switch assembly, wherein the inverter is connected with the phase-shifting transformer, and the multi-position selector switch assembly is connected with the inverter; each phase of the inverter further comprises two basic converting chains, and each basic converting chain comprises an H bridge power unit and a sharing reactor; a three-phase voltage is input into the phase-shifting transformer, and supplied as power to the H bridge power unit of the inverter after being reduced through the phase-shifting transformer; the H bridge power unit outputs a single-phase alternating voltage through rectification, filtration and inversion; and the serial and parallel connection mode and output mode of each basic converting chain can be changed by changing the on-off state of the multi-position selector switch assembly. According to the cascaded high-voltage inverter, a plurality of H bridge power units are serially connected to form minimum basic converting chains, and the serial and parallel connection combinations and star/triangular conversion of a plurality of basic converting chains are controlled by shifting a multi-position switch, so that full capacity output of various voltage-level converters can be realized, and the inverter is simple in structure and multi-purpose.
Description
Technical field
The present invention relates to a kind of high voltage converter, particularly relate to a kind of cascaded high-voltage frequency converter of a plurality of electric pressure full capacity outputs.
Background technology
Along with the development of power electronic device, high voltage converter has obtained using more and more widely at all fields of national economy as the electric-driving installation that drives all types of motors.In the high voltage converter of numerous topological structures, adopt the multi-level high-voltage frequency transformer (cascaded high-voltage frequency converter) of H bridge power unit series connection, realize high-voltage large-capacity output owing to can hang down withstand voltage device, harmonic pollution to electrical network is little, dv/dt to the motor output voltage is little, becomes one of the main flow of present high voltage converter and most widely used form.
The general electric pressure of China's high-voltage motor is 3kV, 6kV and 10kV.Also reducing of geometric ratio of output capacity when regular grade connection type high-voltage frequency converter output voltage reduces.Occasion at demand motive multiple voltage grade motor, be subject to the frequency converter output capacity, can only select the frequency converter of many relevant voltage grades to realize, or realize by increasing time output transformer of the many windings in limit, so greatly increase investment and the place usable floor area of equipment.
At present to mainly contain following two pieces of documents aspect the frequency converter research of multi-voltage grade full capacity output relevant with the present invention:
Document one is that Rongxin Power Electronic Co., Ltd. was in application on 05 27th, 2009, and open on 02 10th, 2010, publication number is the Chinese invention patent application " a kind of current transformer implementation method of variable voltage-class constant power output " of CN101645646A.The multiple variation that the series and parallel connections of this patent by a plurality of identical frequency conversion power units combines, by the divide-shut brake control to switch, realize the series and parallel connections of the unsteady flow chain that A, B, the every mutually a plurality of frequency conversion power units of C three-phase form, simultaneously by the consistency such as the electric current of the output of each frequency conversion power unit output, voltage magnitude, frequency are controlled, thereby output current increases when realizing the output voltage reduction, reaches a plurality of required electric pressures of constant power output.The multi-voltage grade constant power output that namely can change a current transformer realization.
Document two is that Rongxin Power Electronic Co., Ltd. applied on 05 27th, 2009, and on 02 24th, 2010 bulletins, notification number was the Chinese utility model patent " a kind of current transformer of variable voltage-class constant power output " of CN201414072A.This patent relates to a kind of current transformer of constant power output multiple voltage grade, the multiple variation that series and parallel connections by a plurality of identical frequency conversion power units combines, by the divide-shut brake control to switch, realize the series and parallel connections of the unsteady flow chain that A, B, the every mutually a plurality of frequency conversion power units of C three-phase form, simultaneously by the consistency such as the electric current of each frequency conversion power unit output, voltage magnitude, frequency are controlled, thereby output current increases when realizing the output voltage reduction, reaches a plurality of required electric pressures of constant power output.The multi-voltage grade constant power output that namely can change a current transformer realization.
The variation that the series and parallel connections of these documents by a plurality of identical frequency conversion power units combines and to the consistency control of the electric current of each frequency conversion power unit output, voltage peak, frequency is realized constant power output multiple voltage grade.But in above-mentioned document, for realizing multiple voltage grade constant power output, realize the series and parallel combination of power model by the continuous doubling of unsteady flow link, this topological structure number of switches is more, and system's line is complicated.Simultaneously, the parallel current-sharing effect of circuit topological structure is determined by the consistency characteristic of system own fully, because the difference of transducer power module parameter or the inherent characteristic problem of control system, the output voltage of different branch can not be in full accord, the resistance of parallel branch only is conductor resistance, its value is very little, easily causes between the different parallel branches of system and produces circulation, reduces the entire system output capacity.
Summary of the invention
The purpose of this invention is to provide a kind of cascaded high-voltage frequency converter, this device is composed in series minimum unsteady flow link unit with a plurality of H bridge power units, by series and parallel combination and the star/triangle conversion of a plurality of unsteady flow links of many driving switch switching controls, realize respectively the full capacity output of multiple voltage grade frequency converter.
In order to realize the foregoing invention purpose, the present invention specifically provides a kind of technic relization scheme of cascaded high-voltage frequency converter, and a kind of cascaded high-voltage frequency converter comprises: phase shifting transformer, frequency converter and many gear switches switch combination.Frequency converter links to each other with phase shifting transformer, and many gear switches switch combination links to each other with frequency converter.Frequency converter every further comprises two basic unsteady flow chains mutually, and basic unsteady flow chain comprises H bridge power unit and equalizing reactor.Three-phase voltage input phase shifting transformer is through after the phase shifting transformer step-down being the H bridge power unit power supply of frequency converter.The H bridge power unit is the output single-phase alternating voltage after over commutation, filtering and inversion, change series and parallel mode and the output form of each basic unsteady flow chain by the on off state that changes many gear switches switch combination, realized the output of different electric pressure rated capacities.
As the further improvement of a kind of cascaded high-voltage frequency converter technical scheme of the present invention, a winding of phase shifting transformer adopts wye connection, and each secondary winding of phase shifting transformer all adopts prolongs limit triangular form connection.
As the further improvement of a kind of cascaded high-voltage frequency converter technical scheme of the present invention, basic unsteady flow chain comprises five H bridge power units and a reactor, and H bridge power unit and reactor are connected mutually.The H bridge power unit adopts one quadrant convertor or two quadrant current transformer or four quadrant convertors.
As the further improvement of a kind of cascaded high-voltage frequency converter technical scheme of the present invention, the quantity of H bridge power unit is determined by the rated output voltage of single H bridge power unit and the minimum output voltage grade of cascaded high-voltage frequency converter.
Further improvement as a kind of cascaded high-voltage frequency converter technical scheme of the present invention, frequency converter comprises the combination of first foundation unsteady flow chain and the second basic unsteady flow chain combination, first foundation unsteady flow chain combination and the basic unsteady flow chain of being connected are combined in ax, by, cz connection, and include three basic unsteady flow chains.Many gear switches switch combination comprises the first diverter switch, the second diverter switch and the 3rd diverter switch.The first diverter switch is the alternative diverter switch, makes X, Y, the Z of three basic unsteady flow chains of first foundation unsteady flow chain combination connect into neutral point at 3, or is together in parallel with 3 of A, B, the C of three basic unsteady flow chains of the second basic unsteady flow chain combination; The second diverter switch is the one-out-three diverter switch, make A, B, the C of three basic unsteady flow chains of the second basic unsteady flow chain combination connect into neutral point at 3, or the unsettled frequency converter output point that becomes, or be together in parallel with 3 of X, Y, the Z of three basic unsteady flow chains of first foundation unsteady flow chain combination; The 3rd diverter switch is the alternative diverter switch, makes A, B, the C of three basic unsteady flow chains of the second basic unsteady flow chain combination or ax, by, 3 of cz become the frequency converter output point at 3.
Further improvement as a kind of cascaded high-voltage frequency converter technical scheme of the present invention, when cascaded high-voltage frequency converter was realized the specified output of three-phase of 10KV electric pressure, 3 connections of X, Y, Z of three basic unsteady flow chains of first foundation unsteady flow chain combination were as neutral point; Three basic unsteady flow chains of first foundation unsteady flow chain combination are connected respectively at ax, by, cz with three basic unsteady flow chains of the second basic unsteady flow chain combination; 3 star-like outputs of A, B, C from three basic unsteady flow chains of the second basic unsteady flow chain combination.
As further improvement in the technical proposal, when cascaded high-voltage frequency converter was realized the specified output of three-phase of 10KV electric pressure, the triangular carrier phase shift phase angle of 10 H bridge power units of every phase differed 18 ° successively.The triangular carrier phase shift phase angle of 1～No. 10 H bridge power unit is followed successively by 0 °, 18 °, 36 °, 54 °, 72 °, 90 °, 108 °, 126 °, 144 ° and 162 °, and the homophase H bridge power unit of the combination of first foundation unsteady flow chain and the second basic unsteady flow chain combination adopts identical sinusoidal modulation wave signal.
Further improvement as the another kind of cascaded high-voltage frequency converter technical scheme of the present invention, when cascaded high-voltage frequency converter is realized the specified output of three-phase of 6KV electric pressure, 3 connections of X, Y, Z of three basic unsteady flow chains of first foundation unsteady flow chain combination form the 6kV cascade connection type frequency converter of a star-like connection as a neutral point; 3 connections of A, B, C of three basic unsteady flow chains of the second basic unsteady flow chain combination form the 6kV cascade connection type frequency converter of another star-like connection as another neutral point; First foundation unsteady flow chain makes up and the second basic unsteady flow chain is combined in ax, by, cz realizes star-like output in parallel.
As further improvement in the technical proposal, when cascaded high-voltage frequency converter is realized the specified output of three-phase of 6KV electric pressure, the triangular carrier phase shift phase angle that the triangular carrier phase shift phase angle of 5 power cells of every phase differs 1～No. 5 H bridge power unit of every phase of 36 ° of first foundation unsteady flow chain combinations successively is followed successively by 0 °, 36 °, 72 °, 108 °, 144 °, the triangular carrier phase shift phase angle of 6～No. 10 H bridge power units of every phase of the second basic unsteady flow chain combination is followed successively by 144 °, 108 °, 72 °, 36 °, 0 °, the homophase H bridge power unit of first foundation unsteady flow chain combination adopts identical sinusoidal modulation wave signal, and the homophase H bridge power unit of the second basic unsteady flow chain combination adopts and the corresponding mutually opposite polarity sinusoidal modulation wave signal of first foundation unsteady flow chain combination.
Further improvement as the another kind of cascaded high-voltage frequency converter technical scheme of the present invention, when cascaded high-voltage frequency converter is realized the specified output of three-phase of 3KV electric pressure, 3 of X, Y, the Z of three basic unsteady flow chains of first foundation unsteady flow chain combination are connected with 3 of A, B, the C of three basic unsteady flow chains of the second basic unsteady flow chain combination respectively, whenever compose in parallel a link in parallel by two basic unsteady flow chains; 3 of A, B, the C of three basic unsteady flow chains of 3 of X, Y, the Z of three basic unsteady flow chains of first foundation unsteady flow chain combination and the second basic unsteady flow chain combination are connected respectively to b y, cz, ax, and link in parallel connects from beginning to end realizes triangular form output.
As further improvement in the technical proposal, when cascaded high-voltage frequency converter is realized the specified output of three-phase of 3KV electric pressure, the triangular carrier phase shift phase angle of 5 power cells of every phase differs successively the triangular carrier phase shift phase angle that 36 ° of first foundation unsteady flow chains make up 1～No. 5 H bridge power unit of every phase and is followed successively by 0 °, 36 °, 72 °, 108 °, the triangular carrier phase shift phase angle that 144 ° of second basic unsteady flow chain makes up 6～No. 10 H bridge power units of every phase is followed successively by 144 °, 108 °, 72 °, 36 °, 0 ° of first foundation unsteady flow chain combination homophase H bridge power unit adopts identical sinusoidal modulation wave signal, and the second basic unsteady flow chain combination homophase H bridge power unit adopts and the corresponding mutually opposite polarity sinusoidal modulation wave signal of first foundation unsteady flow chain combination.
By implementing the technical scheme of a kind of cascaded high-voltage frequency converter of the invention described above, have following technique effect:
(1) the present invention exports by the full capacity that series and parallel combination and star/triangle conversion to a plurality of unsteady flow links realize respectively 10kV, 6kV and 3kV electric pressure, thereby a kind of cascaded high-voltage frequency converter device that can accomplish a tractor serves several purposes, saving equipment and factory building investment is provided;
(2) the present invention can realize complicated series and parallel combination and star/triangle conversion with less number of switches by using many gear switches switch, and system configuration is simple;
(3) the present invention is by sealing in equalizing reactor, according to each electric pressure output mode the different phase-shifted SPWM modulation strategy of each H bridge power model implementation being guaranteed do not have circulation between each parallel branch, the system's output capacity when having improved in parallel the use at each unsteady flow link.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the main circuit schematic diagram of a kind of embodiment of cascaded high-voltage frequency converter of the present invention;
Fig. 2 is the main circuit equivalent schematic of a kind of embodiment of cascaded high-voltage frequency converter of the present invention under 10KV electric pressure output mode;
Fig. 3 is the SPWM modulation waveform figure of a kind of embodiment of cascaded high-voltage frequency converter of the present invention under 10KV electric pressure output mode;
Fig. 4 is the main circuit equivalent schematic of a kind of embodiment of cascaded high-voltage frequency converter of the present invention under 6KV electric pressure output mode;
Fig. 5 is the SPWM modulation waveform figure of a kind of embodiment of cascaded high-voltage frequency converter of the present invention under 6KV electric pressure output mode;
Fig. 6 is the main circuit equivalent schematic of a kind of embodiment of cascaded high-voltage frequency converter of the present invention under 3KV electric pressure output mode;
Fig. 7 is the SPWM modulation waveform figure of a kind of embodiment of cascaded high-voltage frequency converter of the present invention under 3KV electric pressure output mode;
Fig. 8 is the circuit theory diagrams of H bridge power unit in a kind of embodiment of cascaded high-voltage frequency converter of the present invention;
Fig. 9 is the circuit theory diagrams of the another kind of embodiment H of cascaded high-voltage frequency converter of the present invention bridge power unit;
Figure 10 is the equivalent circuit diagram of basic unsteady flow chain in a kind of embodiment of cascaded high-voltage frequency converter of the present invention;
Among the figure: 1-phase shifting transformer, 2-frequency converter, many gear switches of 3-switch combination, 4-basis unsteady flow chain, the combination of 21-first foundation unsteady flow chain, 22-the second basic unsteady flow chain combination, QS1-the first diverter switch, QS2-the second diverter switch, QS3-the 3rd diverter switch.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
To shown in the accompanying drawing 10, provided the specific embodiment of a kind of cascaded high-voltage frequency converter of the present invention such as accompanying drawing 1, the invention will be further described below in conjunction with the drawings and specific embodiments.
A kind of embodiment of cascaded high-voltage frequency converter comprises: phase shifting transformer 1, frequency converter 2 and many gear switches switch combination 3 as shown in Figure 1.Frequency converter 2 links to each other with phase shifting transformer 1, and many gear switches switch combination 3 links to each other with frequency converter 2.Frequency converter 2 every further comprises two basic unsteady flow chains 4 mutually, and basic unsteady flow chain 4 comprises H bridge power unit and equalizing reactor.The 10kV three-phase voltage inputs to phase shifting transformer 1 from electrical network, through after phase shifting transformer 1 step-down being the H bridge power unit power supply of frequency converter 2.The H bridge power unit is the output single-phase alternating voltage after over commutation, filtering and inversion, change series and parallel mode and the output form of each basic unsteady flow chain by the on off state that changes many gear switches switch combination 3, realized the output of different electric pressure rated capacities.As shown in Figure 10, each basic unsteady flow chain further comprises five H bridge power units and a reactor, and H bridge power unit and reactor are connected mutually.Shown in accompanying drawing 8 and accompanying drawing 9, the H bridge power unit can further adopt one quadrant convertor or two quadrant current transformer or four quadrant convertors, realizes single quadrant or two quadrants or four quadrant running.The gate-controlled switch device of H bridge power unit can be IGBT or IGCT, IEGT etc. among the present invention.
The present invention is composed in series minimum unsteady flow link unit with 5 H bridge power units, by series and parallel combination and the conversion of star/triangle type of a plurality of unsteady flow links of many driving switch switching controls, realize respectively the full capacity output of 10kV, 6kV and 3kV electric pressure frequency converter.Simultaneously by sealing in equalizing reactor at each unsteady flow link, according to each electric pressure output mode each H bridge power unit being carried out different phase-shifted SPWM modulation strategies, having guaranteed does not have circulation between each parallel branch, improves entire system output capacity under the paralleling model.
A winding of phase shifting transformer 1 adopts wye connection, and each secondary winding of phase shifting transformer 1 all adopts prolongs limit triangular form connection.The quantity of H bridge power unit is determined by the rated output voltage of single H bridge power unit and the minimum output voltage grade of cascaded high-voltage frequency converter.The electric pressure of H bridge power unit and series connection quantity determine the output voltage of frequency converter 2, and the output-current rating of H bridge power unit determines the output current of frequency converter 2.The output voltage range of each H bridge power unit is 0～700V by the forming of 10 H bridge power units for cascaded high-voltage frequency converter of the present invention every, and output-current rating is 600A.By many gear switches switch combination 3, can change the forms such as series connection number, parallel-connection structure, the output of star triangle of H bridge power unit, thereby guarantee in 10kV, 6kV, each electric pressure full capacity output of 3kV.
Frequency converter 2 comprises first foundation unsteady flow chain combination the 21 and second basic unsteady flow chain combination 22, first foundation unsteady flow chain combination 21 be connected basic unsteady flow chain combination 22 and locate to connect at ax, by, 3 of cz, and include three basic unsteady flow chains 4.First foundation unsteady flow chain combination 21 comprises three basic unsteady flow chains 4, be respectively: by the H bridge power unit (hereinafter referred to as first basic unsteady flow chain 4 of forming of U1～U5, equalizing reactor L1 module), second the basic unsteady flow chain 4 that is formed by module V1～V5, equalizing reactor L3, the 3rd the basic unsteady flow chain 4 that is formed by module W1～W5, equalizing reactor L5; The second basic unsteady flow chain combination 22 comprises three basic unsteady flow chains 4, be respectively: first the basic unsteady flow chain 4 that is formed by module U6～U10, equalizing reactor L2, second the basic unsteady flow chain 4 that is formed by module V6～V10, equalizing reactor L4, the 3rd the basic unsteady flow chain 4 that is formed by module W6～W10, equalizing reactor L6.
Many gear switches switch combination 3 comprises the first diverter switch QS1, the second diverter switch QS2 and the 3rd diverter switch QS3.The first diverter switch QS1 is the alternative diverter switch, and 3 of X, Y, Z making first foundation unsteady flow chain make up 21 3 basic unsteady flow chains 4 connect into neutral point, or is together in parallel with 3 of A, B, C that the second basic unsteady flow chain makes up 22 3 basic unsteady flow chains 4.The second diverter switch QS2 is the one-out-three diverter switch, 3 of A, B, C making the second basic unsteady flow chain make up 22 3 basic unsteady flow chains 4 connect into neutral point, or the unsettled frequency converter output point that becomes, or be together in parallel with 3 of X, Y, Z that first foundation unsteady flow chain makes up 21 3 basic unsteady flow chains 4.The 3rd diverter switch QS3 is the alternative diverter switch, makes the second basic unsteady flow chain make up A, B, the C of 22 3 basic unsteady flow chains 4 or ax, by, 3 output points that become frequency converter 2 of cz at 3.
The phase-shifted SPWM modulation technique is adopted in the control of cascaded high-voltage frequency converter, its basic thought is to keep the waveform of modulation signal constant, triangular carrier signal to cascade module moves an angle, and it is the sinusoidal wave of many level that this modulation system makes the overlaid waveforms of each Cascade H bridge power unit output voltage.According to the difference of unsteady flow link series and parallel compound mode, also different to the phase-shifted SPWM modulation system of each Cascade H bridge power unit.
When cascaded high-voltage frequency converter is realized the specified output mode of three-phase of 10KV electric pressure, each many driving switch position is as shown in table 1, every output mutually by two unsteady flow links is composed in series under this pattern, becomes the cascaded high-voltage frequency converter of a station symbol standard, and schematic equivalent circuit as shown in Figure 2.The X of frequency converter, Y, 3 connections of Z are as neutral point, every star-like connection of unsteady flow link that is composed in series by 10 H bridge power models, and A, B, C are as output point.This pattern can realize the specified output of 10kV electric pressure, 10MVA capacity.Under this pattern, 3 connections of X, Y, Z of three basic unsteady flow chains 4 of first foundation unsteady flow chain combination 21 are as neutral point.Three basic unsteady flow chains 4 of first foundation unsteady flow chain combination 21 are connected respectively at ax, by, 3 of cz with three basic unsteady flow chains 4 of the second basic unsteady flow chain combination 22.3 star-like outputs of A, B, C from three basic unsteady flow chains 4 of the second basic unsteady flow chain combination 22.
| Many driving switch position | Actual output point | Output form | The output voltage grade | The output full capacity |
| QS1 | QS2 | QS3 | ? | ? | ? | ? |
| 1 | 0 | 1 | A、B、C | Star-like | 10kV | 10MVa |
On off state, output form and the ability of table 110kV electric pressure output mode
10kV electric pressure output mode phase-shifted SPWM modulation system as shown in Figure 3.Under this pattern, every output mutually by two unsteady flow links is composed in series, i.e. 10 H bridge power units cascade forms.When cascaded high-voltage frequency converter is realized the specified output of three-phase of 10KV electric pressure, the triangular carrier phase shift phase angle of 10 H bridge power units of every phase differs 180 °/10=18 ° successively, and (tri1～tri10) the phase shift phase angle is followed successively by 0 °, 18 °, 36 °, 54 °, 72 °, 90 °, 108 °, 126 °, 144 ° and 162 ° to the triangular carrier of 10 H bridge power units that No. 1～10, every phase.(namely U6～U10) adopts identical sinusoidal modulation wave signal to the H bridge power unit of same phase for 1～No. 5 module, i.e. U1～U5 and 6～No. 10 modules.
When cascaded high-voltage frequency converter is realized the specified output of three-phase of 6KV electric pressure, each many driving switch position is as shown in table 2 under this pattern, be composed in series a 6kV cascaded high-voltage frequency converter by 5 H bridge power units, by the output that realizes 2 times of rated current in parallel of 2 6kV cascade connection type frequency converters, schematic equivalent circuit as shown in Figure 4.3 connections of X, Y, Z of three basic unsteady flow chains 4 of first foundation unsteady flow chain combination 21 are as a neutral point, and every star-like connection of unsteady flow link that is composed in series by 1～No. 5 H bridge power unit forms the 6kV cascade connection type frequency converter of a star-like connection.3 connections of A, B, C of three basic unsteady flow chains 4 of the second basic unsteady flow chain combination 22 are as another neutral point, and every star-like connection of unsteady flow link that is composed in series by 6～No. 10 H bridge power units forms the 6kV cascade connection type frequency converter of another star-like connection.The basic unsteady flow chain combination of first foundation unsteady flow chain combination 21 and second 22 locates to realize star-like output in parallel at ax, by, 3 of cz, and every parallel branch has all sealed in equalizing reactor to reduce circulation between branch road.This pattern can realize the specified output of 6kV electric pressure, 10MVA capacity.
On off state, output form and the ability of table 26kV electric pressure output mode
6kV electric pressure output mode phase-shifted SPWM modulation system as shown in Figure 5.Under this pattern, every output mutually by 5 H bridge power units of frequency converter 2 is composed in series.When cascaded high-voltage frequency converter was realized the specified output of three-phase of 6KV electric pressure, the triangular carrier phase shift phase angle of 5 power cells of every phase differed 180 °/5=36 ° successively.Article one, the waterfall sequence of unsteady flow link H bridge power model is 1 to 5, and the waterfall sequence of another unsteady flow link H bridge power model in parallel is 10 to 6.For guaranteeing the crash consistency of two link output voltage waveforms in parallel, (tri1～tri5) the phase shift phase angle is followed successively by 0 °, 36 °, 72 °, 108 °, 144 ° to the triangular carrier of 1～No. 5 (No. 1～5, every phase of first foundation unsteady flow chain combination 21) H bridge power unit of same phase; (tri6～tri10) the phase shift phase angle is followed successively by 144 °, 108 °, 72 °, 36 °, 0 ° to the triangular carrier of 6～No. 10 (No. 6～10, every phase of the second basic unsteady flow chain combination 22) H bridge power units of same phase.(1～No. 5 of same phase of the homophase of first foundation unsteady flow chain combination 21, be that U1～U5) the H bridge power unit adopts identical sinusoidal modulation wave signal, (6～No. 10 of same phase, namely U6～U10) the H bridge power unit adopts and makes up 21 corresponding mutually opposite polarity sinusoidal modulation wave signals with first foundation unsteady flow chain the homophase of the second basic unsteady flow chain combination 22.
When cascaded high-voltage frequency converter is realized the specified output of three-phase of 3KV electric pressure, each many driving switch position is as shown in table 3 under this pattern, be composed in series a unsteady flow branch road by 5 H bridge power units, form a link in parallel by 2 unsteady flow branch roads, three links in parallel are connected the output of realization triangular form from beginning to end, make the output current ability improve 1.732 times.Schematic equivalent circuit as shown in Figure 6.3 of X, Y, the Z of three basic unsteady flow chains 4 of first foundation unsteady flow chain combination 21 are connected with 3 of A, B, the C of three basic unsteady flow chains 4 of the second basic unsteady flow chain combination 22 respectively, whenever, compose in parallel a link in parallel by two basic unsteady flow chains 4, i.e. 1～No. 5 H bridge power unit and 6～No. 10 H bridge power units and be unified into a link.3 of A, B, the C of three basic unsteady flow chains 4 of 3 of X, Y, the Z of three basic unsteady flow chains 4 of first foundation unsteady flow chain combination 21 and the second basic unsteady flow chain combination 22 are connected respectively to by, cz, ax, and link in parallel connects from beginning to end realizes triangular form output.Under this pattern, can realize the specified output of 3kV electric pressure, 10MVA capacity.
On off state, output form and the ability of table 33kV electric pressure output mode
When cascaded high-voltage frequency converter was realized the specified output of three-phase of 3KV electric pressure, 3kV electric pressure output mode phase-shifted SPWM modulation system was identical with 6kV electric pressure output mode, as shown in Figure 7.Under this pattern, every output mutually by 5 H bridge power units is composed in series, and the triangular carrier phase shift phase angle of 5 power cells of every phase differs 180 °/5=36 ° successively.Article one, the waterfall sequence of unsteady flow link H bridge power model is 1 to 5, and the waterfall sequence of another unsteady flow link H bridge power model in parallel is 10 to 6.For guaranteeing the crash consistency of two link output voltage waveforms in parallel, (tri1～tri5) the phase shift phase angle is followed successively by 0 °, 36 °, 72 °, 108 °, 144 ° to the triangular carrier of 1～No. 5 H bridge power unit of every phase (first foundation unsteady flow chain makes up 1～No. 5 H bridge power unit of 21 every phases), and (tri6～tri10) the phase shift phase angle is followed successively by 144 °, 108 °, 72 °, 36 °, 0 ° to the triangular carrier of 6～No. 10 H bridge power units of every phase (the second basic unsteady flow chain makes up 6～No. 10 H bridge power units of 22 every phases).The homophase H bridge power unit of 1～No. 5 H bridge power unit U1 of same phase～U5(first foundation unsteady flow chain combination 21) adopt identical sinusoidal modulation wave signal, the homophase H bridge power unit of 6～No. 10 H bridge power unit U6～U10(, the second basic unsteady flow chain combination 22 of same phase) adopt and make up 21 corresponding mutually opposite polarity sinusoidal modulation wave signals with first foundation unsteady flow chain.
The present invention is by series and parallel combination and the star/triangle conversion of a plurality of unsteady flow links of many driving switch switching controls, realize respectively the full capacity output of 10kV, 6kV and 3kV electric pressure frequency converter, a kind of cascaded high-voltage frequency converter that can accomplish a tractor serves several purposes, saving equipment and factory building investment is provided.By sealing in equalizing reactor at each unsteady flow link, according to each electric pressure output mode each H bridge power unit being carried out different PWM modulation strategies and guarantee do not have circulation between each parallel branch.By using many gear switches switch, can realize complicated series and parallel combination and star/triangle conversion with less number of switches, system configuration is simple.When output 10kV electric pressure, 5 H bridge power units are composed in series minimum unsteady flow link unit, whenever be composed in series the star-like cascaded high-voltage frequency converter that is connected to become a station symbol standard of frequency converter by two unsteady flow links.When output 6kV electric pressure, 5 H bridge power units are composed in series minimum unsteady flow link unit, the 6kV cascade connection type frequency converter that is made of a star-like connection three unsteady flow links is made of the 6kV cascade connection type frequency converter of another star-like connection other three unsteady flow links.By the output that realizes 2 times of rated current in parallel of 2 6kV frequency converters.When output 3kV electric pressure, 5 H bridge power units are composed in series minimum unsteady flow link unit, form a link in parallel by 2 unsteady flow branch roads, three links in parallel are connected from beginning to end realize triangular form output, make the output current ability improve 1.732 times.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet is not to limit the present invention.Any those of ordinary skill in the art, do not breaking away from the technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, be equal to replacements, equivalence changes and modify, all still belong in the scope that technical solution of the present invention protects.
Claims (11)
1. cascaded high-voltage frequency converter, it is characterized in that, comprise: phase shifting transformer (1), frequency converter (2) and many gear switches switch combination (3), described frequency converter (2) links to each other with phase shifting transformer (1), and described many gear switches switch combination (3) links to each other with frequency converter (2); Every two basic unsteady flow chains (4) that further comprise mutually of described frequency converter (2), described basic unsteady flow chain (4) comprises H bridge power unit and equalizing reactor; Three-phase voltage input phase shifting transformer (1), through after phase shifting transformer (1) step-down being the H bridge power unit power supply of frequency converter (2), the H bridge power unit is the output single-phase alternating voltage after over commutation, filtering and inversion, change series and parallel mode and the output form of each basic unsteady flow chain by the on off state that changes many gear switches switch combination (3), realized the output of different electric pressure rated capacities.
2. a kind of cascaded high-voltage frequency converter according to claim 1 is characterized in that: a winding of described phase shifting transformer (1) adopts wye connection, and each secondary winding of described phase shifting transformer (1) all adopts prolongs limit triangular form connection.
3. a kind of cascaded high-voltage frequency converter according to claim 1 and 2, it is characterized in that: described basic unsteady flow chain comprises five H bridge power units and a reactor, and described H bridge power unit and reactor are connected mutually; Described H bridge power unit adopts one quadrant convertor or two quadrant current transformer or four quadrant convertors.
4. a kind of cascaded high-voltage frequency converter according to claim 3 is characterized in that: the quantity of described H bridge power unit is determined by the rated output voltage of single H bridge power unit and the minimum output voltage grade of cascaded high-voltage frequency converter.
5. according to claim 1, the described a kind of cascaded high-voltage frequency converter of arbitrary claim in 2,4, it is characterized in that: described frequency converter (2) comprises first foundation unsteady flow chain combination (21) and the second basic unsteady flow chain combination (22), described first foundation unsteady flow chain combination (21) and the basic unsteady flow chain combination (22) of being connected are located connection at ax, by, 3 of cz, and include three basic unsteady flow chains (4); Described many gear switches switch combination (3) comprises the first diverter switch (QS1), the second diverter switch (QS2) and the 3rd diverter switch (QS3); Described the first diverter switch (QS1) is the alternative diverter switch, make X, Y, the Z of (21) three basic unsteady flow chains of first foundation unsteady flow chain combination (4) connect into neutral point at 3, or be together in parallel with 3 of A, B, the C of second basic unsteady flow chain (22) three basic unsteady flow chains of combination (4); Described the second diverter switch (QS2) is the one-out-three diverter switch, make A, B, the C of second basic unsteady flow chain (22) three basic unsteady flow chains of combination (4) connect into neutral point at 3, or the unsettled frequency converter output point that becomes, or be together in parallel with 3 of X, Y, the Z of (21) three basic unsteady flow chains of first foundation unsteady flow chain combination (4); Described the 3rd diverter switch (QS3) is the alternative diverter switch, makes A, B, the C of the second basic unsteady flow chain (22) three basic unsteady flow chains of combination (4) or ax, by, 3 output points that become frequency converter (2) of cz at 3.
6. a kind of cascaded high-voltage frequency converter according to claim 5, it is characterized in that: when cascaded high-voltage frequency converter was realized the specified output of three-phase of 10KV electric pressure, 3 connections of X, Y, Z of three basic unsteady flow chains (4) of described first foundation unsteady flow chain combination (21) were as neutral point; Three basic unsteady flow chains (4) of first foundation unsteady flow chain combination (21) are connected respectively at ax, by, 3 of cz with three basic unsteady flow chains (4) of the second basic unsteady flow chain combination (22); 3 star-like outputs of A, B, C from three basic unsteady flow chains (4) of the second basic unsteady flow chain combination (22).
7. a kind of cascaded high-voltage frequency converter according to claim 5, it is characterized in that: when cascaded high-voltage frequency converter is realized the specified output of three-phase of 6KV electric pressure, 3 connections of X, Y, Z of three basic unsteady flow chains (4) of described first foundation unsteady flow chain combination (21) form the 6kV cascade connection type frequency converter of a star-like connection as a neutral point; 3 connections of A, B, C of three basic unsteady flow chains (4) of the described second basic unsteady flow chain combination (22) form the 6kV cascade connection type frequency converter of another star-like connection as another neutral point; First foundation unsteady flow chain combination (21) and the second basic unsteady flow chain combination (22) locate to realize star-like output in parallel at ax, by, 3 of cz.
8. a kind of cascaded high-voltage frequency converter according to claim 5, it is characterized in that: when cascaded high-voltage frequency converter is realized the specified output of three-phase of 3KV electric pressure, 3 of X, Y, the Z of three basic unsteady flow chains (4) of described first foundation unsteady flow chain combination (21) are connected with 3 of A, B, the C of three basic unsteady flow chains (4) of the second basic unsteady flow chain combination (22) respectively, whenever compose in parallel a link in parallel by two basic unsteady flow chains (4); 3 of A, B, the C of three basic unsteady flow chains (4) of 3 of X, Y, the Z of three basic unsteady flow chains (4) of first foundation unsteady flow chain combination (21) and the second basic unsteady flow chain combination (22) are connected respectively to by, cz, ax, and link in parallel connects from beginning to end realizes triangular form output.
9. a kind of cascaded high-voltage frequency converter according to claim 6 is characterized in that: when cascaded high-voltage frequency converter was realized the specified output of three-phase of 10KV electric pressure, the triangular carrier phase shift phase angle of 10 H bridge power units of every phase differed successively
, the triangular carrier phase shift phase angle of 10 H bridge power units of 1～No. 10 is followed successively by
,
,
,
,
,
,
,
,
With
, the H bridge power unit of homophase adopts identical sinusoidal modulation wave signal.
10. a kind of cascaded high-voltage frequency converter according to claim 7 is characterized in that: when cascaded high-voltage frequency converter was realized the specified output of three-phase of 6KV electric pressure, the triangular carrier phase shift phase angle of 5 power cells of every phase differed successively
, the triangular carrier phase shift phase angle of 1～No. 5 H bridge power unit of every phase of first foundation unsteady flow chain combination (21) is followed successively by
,
,
,
,
, the triangular carrier phase shift phase angle of 6～No. 10 H bridge power units of every phase of the second basic unsteady flow chain combination (22) is followed successively by
,
,
,
,
The homophase H bridge power unit of first foundation unsteady flow chain combination (21) adopts identical sinusoidal modulation wave signal, and the homophase H bridge power unit of the second basic unsteady flow chain combination (22) adopts and first foundation unsteady flow chain combination (21) corresponding mutually opposite polarity sinusoidal modulation wave signal.
11. a kind of cascaded high-voltage frequency converter according to claim 8 is characterized in that: when cascaded high-voltage frequency converter was realized the specified output of three-phase of 3KV electric pressure, the triangular carrier phase shift phase angle of 5 power cells of every phase differed successively
, the triangular carrier phase shift phase angle of 1～No. 5 H bridge power unit of first foundation unsteady flow chain combination (21) every phase is followed successively by
,
,
,
,
, the phase shift phase angle of 6～No. 10 H bridge power units of second basic unsteady flow chain combination (22) every phase triangular carrier is followed successively by
,
,
,
,
The homophase H bridge power unit of first foundation unsteady flow chain combination (21) adopts identical sinusoidal modulation wave signal, and the homophase H bridge power unit of the second basic unsteady flow chain combination (22) adopts and first foundation unsteady flow chain combination (21) corresponding mutually opposite polarity sinusoidal modulation wave signal.
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| CN112787521A (en) * | 2019-11-08 | 2021-05-11 | 台达电子企业管理（上海）有限公司 | Power conversion device and power supply system |
| CN112952809A (en) * | 2021-02-20 | 2021-06-11 | 云南电网有限责任公司电力科学研究院 | Series loop-closing power regulating device and method for multi-loop network cabinet of power distribution network |
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