CN1988353A - Cascade multiple indirect matrix converter - Google Patents
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- CN1988353A CN1988353A CN 200610119264 CN200610119264A CN1988353A CN 1988353 A CN1988353 A CN 1988353A CN 200610119264 CN200610119264 CN 200610119264 CN 200610119264 A CN200610119264 A CN 200610119264A CN 1988353 A CN1988353 A CN 1988353A
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Abstract
This invention relates to a cascade multiple indirect matrix converter, in which, a total input filter is connected between a net and a step-down transformer, which has 3n secondary windings, the phase of each three windings is the same, and that of adjacent winding sets is different, a converter array is arrayed into 3 rows x n lines by 3n three-phase- single phase indirect matrix converter units, and lines in the array are connected with the secondary windings correspondingly, the outputs of the rows are serial orderly and three form a three-phase AC output, the total contoller is responsible for regulating the work of the entire system and connected with the branch controllers by signal cables to control work of the converter units in the converter array, and the power switch array in the unit is composed of a prime rectifier and a rear rectifier.
Description
Technical field
The present invention relates to a kind of cascade multiple indirect matrix converter, relate in particular to and a kind ofly be applicable to the three-phase high-voltage ac power supply, adopt the step-down transformer of several secondary winding of multiple of 3 and cascaded multiple three-phase-single-phase indirect matrix converter, can obtain the cascade multiple indirect matrix converter of higher magnitude and amplitude and frequency adjustable three-phase alternating voltage.Belong to the power electronic equipment technical field.
Background technology
At mesohigh large power alternating-current electric power transmission field, comprise a large amount of blower fan, the pump class even loads of using of industrial and mining enterprises, all adopt the AC power of three-phase main-frequency high pressure directly to be motor power supply, the constant frequency of not pressure regulation traditionally, efficient is often very low, and startup and speed adjusting performance are very poor.Development along with the Technics of Power Electronic Conversion technology, converters successfully has been applied in the transmission of these mesohigh motor, not only improved transmission performance, improved transmission efficiency, and improved automaticity, saved lot of energy, economic benefit and social benefit highly significant.The converters scheme of having used mainly comprises two classes: high pressure-high pressure type and high pressure-low pressure-high pressure type.For the former, mainly comprise three kinds of schemes at present: 1 power switch is the friendship orthogonal high-voltage inverter of series connection directly; The multi-electrical level inverter that the multi-electrical level inverter of 2 diode clamps and 3 electric capacity fly to stride.For the latter, mainly comprise a kind of scheme at present, promptly cascaded multiple is handed over orthogonal inverter.But in actual applications, this two classes mesohigh converter all exists defective inevitably, not only increased cost, reduced reliability, and the structure of its front stage converter does not allow to realize the energy two-way flow between electrical network and the converter, the net side power factor of indivedual converters is difficult to improve, and maybe needs to pay a high price and could improve.No matter this is that its front stage converter all adopts uncontrollable rectifier because of the former or the latter, need short electrochemical capacitor of big capacity life-span.If its front stage converter adopts the controlled rectifier technology, not only increased the complexity of system, increased cost, and the essential electrochemical capacitor that often upgrades.Based on above actual conditions, pressing for novel mesohigh converters occurs, its indispensable following feature: need not the use of electrochemical capacitor, can realize the four quadrant running ability between electrical network and the converter, it is excessive that the capacity of single inverter unit comprises that voltage endurance capability and current capacity are difficult for.Such converter not only output voltage amplitude can be regulated, and input current presents sinusoidal waveform, and the secondary winding design of the step-down transformer of its high voltage supply can be identical, therefore cost is low, life-span is long, reliability height, the developing direction of suitable following mesohigh converters.The mesohigh converter that can satisfy above condition can only be that the cascaded multiple of high pressure-low pressure-high pressure type hands over AC-AC converter, and indirect matrix converter is exactly wherein a kind of.At present, there is not correlation technique openly to report as yet.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, design provides a class cascade multiple indirect matrix converter, has net side four quadrant running ability, advantages such as output AC voltage is adjustable continuously, step-down transformer is simple in structure, with low cost, highly versatile, reliability height and conserve energy.
For achieving the above object, the present invention is made of total input filter, the step-down transformer with several three-phase secondary winding of multiple of 3, transducer array and the master controller that three-phase-single-phase indirect matrix converter unit constitutes.Step-down transformer input high pressure three-phase alternating voltage, the low-voltage three-phase AC voltage that the multiple array of output 3 is isolated, every group of corresponding three-phase secondary winding of low-voltage three-phase AC voltage, the connection group or the phase place of three-phase secondary winding can be identical, also can be different according to rule.Power converter cells be input as three-phase alternating voltage, be output as the single phase alternating current (A.C.) voltage of voltage and frequency adjustable.The quantity of three-phase secondary winding is identical with the quantity of power converter cells in the transducer array, all power converter cells are divided into three groups, every group forms row, the output of the power converter cells in every row links to each other successively, one cross streams voltage of final output voltage and frequency adjustable, obtain the output voltage capability of multiplication, the quantity of the power converter cells in every row is many more, and the amplitude of output AC voltage is high more.The power converter cells that line number is identical in every row the three-phase secondary winding of corresponding step-down transformer have identical connection group, the absolute value of the master phase difference between the three-phase secondary winding of adjacent line number be 60 ° divided by total line number, the phase place that is positioned at the three-phase secondary winding of the power converter cells correspondence of going in the middle of every row is zero, the phase place of the three-phase secondary winding of the power converter cells correspondence of other row is the integral multiple of master phase difference, the phase place of the three-phase secondary winding of row was a positive number in the middle of line number was lower than, and the phase place of the three-phase secondary winding of row was a negative in the middle of line number was higher than.Total input filter is conventional high pressure LC filter, places between electrical network and the step-down transformer, and input voltage and input current are carried out filtering.Each power converter cells comprises a sub-controller, is responsible for the switching rule of power device in each power converter cells of control, and master controller is connected by signal cable with each sub-controller, is responsible for coordinating the operation conditions of each sub-controller of control.Like this according to the needs of load motor transmission, transducer array can be exported the three symmetrical continuously adjustable high pressure P WM of first-harmonic amplitude-frequency (pulse width modulation) voltages, satisfy the transmission needs of load motor system, simultaneously obtain sine-shaped input current waveform at the electrical network input, electrical network is not had harmonic current pollute, between transducer array and the load, between the three-phase secondary winding of transducer array and step-down transformer, all kept the four-quadrant ability to transform between step-down transformer and the electrical network.
Total input filter of the present invention is made of conventional three-phase high-voltage LC filter, wherein three filter inductances are serially connected in respectively in the three-phase incoming line, its input links to each other with electrical network, output links to each other with the step-down transformer input, one end of three filter capacitors is connected respectively to the output of three filter inductances, its other end interconnects, and forms a common point.
Step-down transformer of the present invention has several three-phase secondary winding of multiple of 1 elementary winding and 3, wherein the elementary winding of three-phase high-voltage links to each other with the output of the three-phase filter inductance of total input filter respectively, and each three-phase low-voltage secondary winding links to each other with a power converter cells in the transducer array respectively.Per 3 secondary winding are one group and have identical phase place, not winding phase place difference on the same group.Initial phase is 0 °, and the absolute value of master phase difference is 60 a °/group number between the adjacent set.
Transducer array of the present invention is made of several power converter cells of multiple of 3, identical with the quantity of the secondary winding of step-down transformer, wherein all power converter cells are arranged in the array structure of one 3 row multirow, the group of step-down transformer secondary winding respectively with transducer array in capable corresponding, three secondary winding in every group respectively with every row in corresponding one by one linking to each other of three power converter cells.The power take-off of the power converter cells of each row is connected successively, form cross streams voltage output, a lead-out terminal of three rank transformation device unit interconnects, form a neutral point, another output output three-phase alternating voltage links to each other with three-phase input end of mesohigh alternating current motor during use.Each power converter cells is connected with master controller by signal cable respectively.
Described power converter cells is made of a minute input filter, synchrotrans, power switch array and sub-controller, wherein divide input filter to constitute by conventional low pressure three-phase LC filter, three filter inductances are serially connected in respectively between the input of the secondary winding of step-down transformer and power switch array, one end of three filter capacitors is interconnected to form a common point, and the other end links to each other with the input of power switch array respectively.
Described synchrotrans are step-down transformer, and its elementary winding links to each other with the output of minute input filter and the input of power switch array, and secondary winding links to each other with the testing circuit of sub-controller.
Described power switch array is directly linked by prime rectifier and back level inverter and constitutes, the prime rectifier is the 3H bridge construction, comprise three brachium pontis, the input three-phase alternating voltage, output two-way direct voltage, back level inverter is the 2H bridge construction, comprise two brachium pontis, input two-way direct voltage, output single phase alternating current (A.C.) voltage, the prime rectifier interconnects respectively with the top and bottom of whole 5 brachium pontis of back level inverter.Two outputs of back level inverter 2H bridge are two power outputs of power converter cells.
Described sub-controller is made up of testing circuit, computing modulator, logical circuit and isolation drive protective circuit; testing circuit links to each other with the three-phase output end of synchrotrans; the output of testing circuit links to each other with the computing modulator by holding wire; the computing modulator links to each other with logical circuit by holding wire; the isolation drive protective circuit links to each other with logical circuit with the computing modulator, and links to each other with the power switch array of power converter cells.
The present invention is with the power converter cells output series connection of same row in the transducer array, realized handing over the cascaded multiple of direct converter, amplitude and frequency adjustable have been obtained, the three-phase alternating voltage output of voltage multiplication, be adapted to the power supply needs of mesohigh motor, the branch input current of the power converter cells of each row generation simultaneously is coupled to the three-phase primary windings of step-down transformer through the secondary winding of step-down transformer, synthetic three-phase pulse current waveform in the three-phase primary windings of step-down transformer, pass through the filter action of total input filter again, finally obtain total input current of three phase sine waveform, the phase place that the phase place of total input current can relative line voltage under the control of sub-controller and master controller is regulated, thereby the cascaded multiple mesohigh that has obtained novel high-pressure-low pressure-high pressure type is handed over AC-AC converter, and the whole system structure has all possessed the two-way flow ability of energy, not only can obtain the adjustable three-phase high-voltage of amplitude-frequency and exchange output, output voltage capability even can surpass line voltage when the progression of cascaded multiple is high, and can the unit's of acquisition total power input factor and four quadrant running ability, thereby it is good to have a transform effect, features such as highly versatile, have simple in structure simultaneously, total cost is low, life-span is long, the efficient height, realize advantages such as easy, can also support the output of bigger power, be particularly useful for application scenarios such as the speed governing of mesohigh alternating current motor and startup.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Among Fig. 1,1 is total input filter, and 2 is step-down transformer, and 3 is transducer array, and 4 is master controller.
Fig. 2 is the circuit theory diagrams of the indirect matrix converter unit in Fig. 1 transducer array.
Among Fig. 2,5 for dividing input filter, and 6 is synchrotrans, and 7 is the power switch array, and 8 is sub-controller.
Fig. 3～Fig. 9 is the schematic diagram of prime rectifier embodiment in the power switch array 7 among Fig. 2.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is further described.Following examples are to further specify of the present invention, and do not constitute limitation of the invention.
5 heavy cascaded multiple matrix converters with the present invention's design are that example describes, and structure is made of total input filter 1, step-down transformer 2, transducer array 3 and master controller 4 as shown in Figure 1.Total input filter 1 is made up of three filter inductances and three filter capacitors, the input of three filter inductances connects electrical network, its output connects the three-phase primary windings of step-down transformer 2, one end of three filter capacitors is connected with the output of three filter inductances respectively, and its other end interconnects.Step-down transformer 2 is made up of a three-phase primary high pressure winding, 15 low pressure three-phase secondary winding and magnetic core, three outputs of the filter inductance in three-phase primary windings and the total input filter 1 link to each other, the three-phase secondary winding is divided into 5 groups, every group of phase place be respectively-24 ° ,-12 °, 0 ° ,+12 ° and+24 °, be connected respectively to the power converter cells in the transducer array 3, magnetic core provides magnetic circuit, realizes the magnetic circuit coupling between elementary winding and the secondary winding.Transducer array 3 is made up of=15 power converter cells of 3 row * 5 row, be arranged in array structure, the three-phase input end of each power converter cells links to each other with the three-phase output end of a three-phase secondary winding of step-down transformer, the phase place of three groups of three-phase secondary winding of the step-down transformer of the power converter cells correspondence that line number is identical is identical, the phase place difference of three groups of three-phase secondary winding of the step-down transformer of the power converter cells correspondence that line number is different, the power output of 5 power converter cells of each row links to each other successively, three are listed in and adopt the Y connection generally, form three-phase high-voltage ac output end and a neutral point N respectively.Master controller 4 is made up of general microcontroller, Digital Signal Processing and/or logic processor, carries out information interaction by signal cable and each power converter cells.
In total input filter 1, R, the S that the end of filter inductance L1, L2 and L3 is connected electrical network respectively and T are mutually, the other end back that links to each other with the end of filter capacitor C1, C2 and C3 respectively links to each other with the input of the three-phase primary windings of step-down transformer, and the other end of filter capacitor C1, C2 and C3 interconnects.
In the step-down transformer 2, three-phase primary high pressure winding links to each other with the output of total input filter, 5 groups the output of totally 15 three-phase secondary low-voltage windings link to each other with the input of 15 three-phases-single-phase indirect matrix converter unit in the transducer array respectively.
In the transducer array 3, the output of power converter cells U4 links to each other with the output of power converter cells U5, another output of U4 links to each other with the output of power converter cells U3, the output of power converter cells U2 links to each other with another output of power converter cells U3, another output of U2 links to each other with the output of power converter cells U1, and another output of power converter cells U1 becomes the output of U phase; The output of power converter cells V4 links to each other with the output of power converter cells V5, another output of V4 links to each other with the output of power converter cells V3, the output of power converter cells V2 links to each other with another output of power converter cells V3, another output of V2 links to each other with the output of power converter cells V1, and another output of power converter cells V1 becomes the output of V phase; The output of power converter cells W4 links to each other with the output of power converter cells W5, another output of W4 links to each other with the output of power converter cells W3, the output of power converter cells W2 links to each other with another output of power converter cells W3, another output of W2 links to each other with the output of power converter cells W1, and another output of power converter cells W1 becomes the output of W phase; Power converter cells U5, another output of V5 and W5 is interconnected to form neutral point N, phase place links to each other respectively for the three-phase output end of-24 ° of secondary winding in its input and the step-down transformer, power converter cells U4, phase place links to each other respectively for the three-phase output end of-12 ° of secondary winding in the input of V4 and W4 and the step-down transformer, power converter cells U3, phase place is that the three-phase output end of 0 ° of secondary winding links to each other respectively in the input of V3 and W3 and the step-down transformer, power converter cells U2, phase place links to each other power converter cells U1 respectively for the three-phase output end of+12 ° of secondary winding in the input of V2 and W2 and the step-down transformer, phase place links to each other respectively for the three-phase output end of+24 ° of secondary winding in the input of V1 and W1 and the step-down transformer.Power converter cells U5～U1, V5～V1 link to each other with master controller with PW5～PW1 by signal cable PU5～PU1, PV5～PV1 respectively with W5～W1.
In the master controller 4, master controller by signal cable PU5～PU1, PV5～PV1 and PW5～PW1 respectively with transducer array in three-phase-single-phase indirect matrix converter unit U5～U1, V5～V1 be connected with W5～W1.
Three-phase-single-phase indirect matrix converter unit in the transducer array of the present invention's design is made of minute input filter 5, synchrotrans 6, power switch array 7 and sub-controller 8 as shown in Figure 2.Divide input filter 5 to form by three filter inductances and three filter capacitors, the input of three filter inductances connects the three-phase output end of step-down transformer secondary winding, its output connects an end, the three-phase primary windings of synchrotrans and the input of power switch array of three filter capacitors, and the other end of three filter capacitors interconnects.Synchrotrans 6 are made up of three-phase primary windings, three-phase secondary winding and magnetic core, and elementary winding is connected with the output that divides input filter, the input of power switch array, and secondary winding is connected with the testing circuit of sub-controller.Power switch array 7 is directly linked by prime rectifier and back level inverter and constitutes, the prime rectifier is the 3H bridge construction, comprise three brachium pontis, the input three-phase alternating voltage, output two-way direct voltage, back level inverter is the 2H bridge construction, comprise two brachium pontis, input two-way direct voltage, output single phase alternating current (A.C.) voltage, the prime rectifier interconnects respectively with the top and bottom of whole 5 brachium pontis of back level inverter.Two outputs of back level inverter 2H bridge are two power outputs of power converter cells.Sub-controller 8 is made up of testing circuit, computing modulator, logical circuit and driving isolation protective circuit; testing circuit links to each other with the three-phase output end of synchrotrans; its output links to each other with the computing modulator by holding wire; the computing modulator links to each other with logical circuit by holding wire; the isolation drive protective circuit links to each other with logical circuit with the computing modulator, and links to each other by the power switch array of signal cable with three-phase-single-phase indirect matrix converter unit.
Divide in the input filter 5, the end of filter inductance L4, L5 and L6 is connected the output of the three-phase secondary winding of step-down transformer respectively, link to each other with the elementary winding of synchrotrans, power switch array input after the other end links to each other with the end of filter capacitor C4, C5 and C6 respectively, the other end of filter capacitor C4, C5 and C6 interconnects.
In the synchrotrans 6, elementary winding is connected with the output that divides input filter, the input of power switch array, and secondary winding is connected with the testing circuit of sub-controller.
In the power switch array 7, the prime rectifier is the 3H bridge construction, and three brachium pontis mid points link to each other with the output of filter inductance in minute input filter; Back level inverter is the 2H bridge construction, contrary the 4th brachium pontis of formation that be connected in series of leading type power switch SI1 and SI3, contrary the 5th brachium pontis of formation that be connected in series of leading type power switch SI2 and SI4, two brachium pontis mid points form two ac output end P1 and P2, and the top and bottom of five brachium pontis directly connect respectively.
In the sub-controller 8, testing circuit links to each other with the secondary winding of synchrotrans, drives isolation protective circuit and links to each other with the power switch array by signal cable.
The power switch array 7 of the present invention's design is connected and composed by the power switch bridge-type, and numerous embodiments can be arranged, and wherein mainly is that the prime rectifier can be made up of various structure.Power switch array prime rectifier as shown in Figure 2, two-way controlled power switch S 1 is connected in series with S4 and constitutes first brachium pontis, two-way controlled power switch S 2 is connected in series with S5 and constitutes second brachium pontis, two-way controlled power switch S 3 is connected in series with S6 and constitutes the 3rd brachium pontis, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, two-way controlled power switch S 1, S2 links to each other with the upper end of S3 and directly links to each other two-way controlled power switch S 4 with the upper end of back level inverter, S5 links to each other with the lower end of S6 and directly links to each other with the lower end of back level inverter.
Fig. 3～Fig. 9 has provided the schematic diagram of several different embodiment in addition of prime rectifier in the power switch array 7.
Second of the prime rectifier embodiment as shown in Figure 3 in the power switch array 7, three two-way controlled power switch S 1, S2, S3 constitute three brachium pontis with three two-way controlled power switch S 4 of sparse type, corresponding one by one respectively being connected in series of S5, S6, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, high-end two-way controlled power switch S 1, S2 link to each other with the upper end of S3 and directly link to each other with the upper end of back level inverter, and the two-way controlled power switch S 4 of the sparse type of low side, S5 link to each other with the lower end of S6 and directly link to each other with the lower end of back level inverter.
The 3rd of the prime rectifier the embodiment as shown in Figure 4 in the power switch array 7, very sparse two-way controlled power switch S 1 is connected in series with S4 and constitutes first brachium pontis, very sparse two-way controlled power switch S 2 is connected in series with S5 and constitutes second brachium pontis, very sparse two-way controlled power switch S 3 is connected in series with S6 and constitutes the 3rd brachium pontis, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, high-end very sparse two-way controlled power switch S 1, S2 links to each other with the upper end of S3 and directly links to each other the very sparse two-way controlled power switch S 4 of low side with the upper end of back level inverter, S5 links to each other with the lower end of S6 and directly links to each other with the lower end of back level inverter.
The 4th of the prime rectifier the embodiment as shown in Figure 5 in the power switch array 7, the two-way controlled power switch S 1 of supersparsity directly constitutes first brachium pontis, the two-way controlled power switch S 2 of supersparsity directly constitutes second brachium pontis, the two-way controlled power switch S 3 of supersparsity directly constitutes the 3rd brachium pontis, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, the two-way controlled power switch S 1 of supersparsity, S2 link to each other with the upper end of S3 and directly link to each other with the upper end of back level inverter, and its lower end links to each other and directly links to each other with the lower end of back level inverter.
The 5th of the prime rectifier the embodiment as shown in Figure 6 in the power switch array 7, inverse-impedance type power switch S1 and S4 are connected in series and constitute first brachium pontis, inverse-impedance type power switch S2 and S5 are connected in series and constitute second brachium pontis, inverse-impedance type power switch S3 and S6 are connected in series and constitute the 3rd brachium pontis, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, high-end inverse-impedance type power switch S1, S2 links to each other with the upper end of S3 and directly links to each other low side inverse-impedance type power switch S4 with the upper end of back level inverter, S5 links to each other with the lower end of S6 and directly links to each other with the lower end of back level inverter.
The 6th of the prime rectifier the embodiment as shown in Figure 7 in the power switch array 7, contrary type power switch S1 and S4 first brachium pontis of formation that is connected in series of leading, two contrary leads type power switch S2 and S5 second brachium pontis of formation that be connected in series, contrary type power switch S3 and S6 the 3rd brachium pontis of formation that be connected in series of leading, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, the high-end contrary type power switch S1 that leads, S2 links to each other with the upper end of S3 and directly links to each other the contrary type power switch S4 that leads of low side with the upper end of back level inverter, S5 links to each other with the lower end of S6 and directly links to each other with the lower end of back level inverter.
The 7th of the prime rectifier the embodiment as shown in Figure 8 in the power switch array 7, the two-way controlled power switch S 1 and the S4 that are made of anti-drag type IGBT inverse parallel are connected in series and constitute first brachium pontis, the two-way controlled power switch S 2 and the S5 that are made of anti-drag type IGBT inverse parallel are connected in series and constitute second brachium pontis, the two-way controlled power switch S 3 and the S6 that are made of anti-drag type IGBT inverse parallel are connected in series and constitute the 3rd brachium pontis, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, the high-end two-way controlled power switch S 1 that constitutes by anti-drag type IGBT inverse parallel, S2 links to each other with the upper end of S3 and directly links to each other with the upper end of back level inverter, the two-way controlled power switch S 4 of low side that is made of anti-drag type IGBT inverse parallel, S5 links to each other with the lower end of S6 and directly links to each other with the lower end of back level inverter.
The 8th of the prime rectifier the embodiment as shown in Figure 9 in the power switch array 7, diode D1 and D4 are connected in series and constitute first brachium pontis, diode D2 and D5 are connected in series and constitute second brachium pontis, diode D3 and D6 are connected in series and constitute the 3rd brachium pontis, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, high-end diode D1, D2 link to each other with the upper end negative electrode of D3 and directly link to each other with the upper end of back level inverter, and low side diode D4, D5 link to each other with the lower end anode of D6 and directly link to each other with the lower end of back level inverter.
Operation principle of the present invention is:
(1) in total input filter 1, three-phase LC filter carries out filtering to line voltage, and the pulse current of the elementary winding of step-down transformer is carried out filtering, obtains sine-shaped input current.
(2) in the step-down transformer 2, elementary winding input three-phase mesohigh alternating voltage, by electromagnetic induction, in secondary winding, obtain 15 tunnel low-voltage ac voltages of isolating, use by the lower pressure transducer array that three-phase-single-phase indirect matrix converter unit is formed for the back level.
(3) in the transducer array 3, the adjustable alternating voltage of amplitude-frequency of a phase low pressure is exported in each three-phase-single-phase indirect matrix converter unit, all power converter cells adopt identical control strategy, 5 power converter cells that are positioned at same row adopt the identical modulation strategy of output voltage phase place, series connection is carried out in its output, the power converter cells that is positioned at delegation adopts the identical modulation strategy of input voltage phase, the input voltage phase of 5 line transformer unit is respectively-24 °,-12 °, 0 °, + 12 ° and+24 °, each differs from 120 ° output voltage phase place between 3 row of transducer array, obtain the adjustable three-phase high-voltage alternating voltage U of amplitude-frequency of voltage magnitude multiplication like this, V and W, and output AC voltage is many level, add that three-phase-single-phase indirect matrix converter is exactly many level in essence, the level number of output AC voltage is more, means that the first-harmonic content of output AC voltage is higher.Each power converter cells can adopt various control strategy and change of current strategy, the former is as switch function algorithm, current space vector algorithm, two-wire voltage algorithm and hysteresis current algorithm, the latter such as medium-softization four step change of current strategies, semi-natural two step strategies and a step change of current strategy, for the power converter cells of same row different rows, for the better alternating voltage of output waveform and/or reduce the common-mode voltage intensity of system, the modulation algorithm of specific implementation requires different, as adopting phase shift modulation technology and common-mode voltage inhibition technology.Sub-controller in the power converter cells is under the coordination control of master controller; be responsible for detecting the information of power converter cells input voltage; as voltage waveform and zero crossing; the computing modulator carries out series of computation after reading these information; and realize corresponding modulation algorithm; produce pwm pulse signal; again after the logical operation via logical circuit; produce whole 12 road required PWM drive pulse signals of power switch in the power switch array; behind the isolation protective circuit of overdriving, send into the gate pole of power switch in the power switch array again; opening and shutoff work of driving power switch; realize the conversion of three-phase alternating voltage-single phase alternating current (A.C.) voltage; if overcurrent or overheat condition appear in a certain power switch; the power switch array will feed back fault-signal and be sent to sub-controller; the protection of realization hardware and software, sub-controller will send master controller for information about to, and master controller is carried out whole the intervention.
Power converter cells in the transducer array is 3 integral multiple, thereby it is capable to constitute 3 row n, and n generally 〉=3 can satisfy the more three-phase alternating current output voltage needs of wide region, and output voltage amplitude can surpass the amplitude of line voltage.
(4) in the master controller 4, master controller by signal cable PU5～PU1, PV5～PV1 and PW5～PW1 respectively with transducer array in three-phase-single-phase indirect matrix converter unit U5～U1, V5～V1 and W5～W1 carry out information exchange, carry out totally control.
Total input filter of the present invention, step-down transformer, the transducer array and the master controller that are made of power converter cells are inseparable part, can not analyze separately simply, thereby constitute cascaded multiple matrix converter.The essence of operation principle is: step-down transformer is finished the conversion by High AC voltage-low-voltage ac voltage, is the low power three-phase of low pressure-single-phase indirect matrix converter unit power supply.Each power converter cells can convert the three-phase low-voltage ac voltage to the adjustable low-voltage ac voltage of single-phase amplitude-frequency, obtain the adjustable High AC voltage of single-phase amplitude-frequency after the output series connection of the power converter cells of same row, three rank transformation device unit just can produce the adjustable High AC voltage of three-phase amplitude-frequency, for mesohigh alternating current motor drive system provides variable frequency power supply.Because power converter cells is for handing over AC-AC converter, step-down transformer in essence can unsteady flow, and the specific aim setting of the secondary winding phase place of step-down transformer, make that the whole converter system is a four-quadrant converter, energy can two-way circulate, can eliminate the more harmonic current components of high order in the net side, can obtain sinusoidal current waveform and adjustable power factor, not only obtained high-power Frequency Drive power supply, and possessed power environment protection feature completely in essence, eliminated the friendship orthogonal multi-stage transformation structure of the components and parts and the conventional high-tension high-power frequency conversion transmission power supply in low life-span simultaneously, it is low to have cost, the efficient height, simple in structure, the reliability advantages of higher, each secondary winding of used step-down transformer can be designed to identical connection group or phase place in addition, for example be designed to the simplest Y type syndeton, the progression of cascaded multiple can increase and reduce in addition, therefore is highly suitable for high-power Frequency Drive field.
Filter inductance L1～L3 is common high voltage induction in the above-mentioned device, and filter capacitor C1～C3 is the common high-voltage capacitance of low sense, and filter inductance L4～L6 is common low pressure inductance, and filter capacitor C4～C6 does not require precision for the common low-voltage capacitance of low sense; Optional stream effective value 1140V, 660V and the 380V voltage level of choosing friends of power converter cells supply power voltage, correspondingly the forward voltage blocking ability of power switch IGBT in the design power switch arrays has not a particular requirement consistency; Sub-controller and master controller can be selected microcontroller and digital signal processor, do not do specific requirement; Step-down transformer can be selected conventional high pressure drop pressure transformer, and its secondary winding can adopt different connection groups or adopt identical connection group.The parameter of one embodiment of the invention is: L1～L6 gets 0.1mH～50mH, and C1～C6 gets 1 μ F～470 μ F.
Obviously, cascade multiple indirect matrix converter of the present invention can be applied in mesohigh alternating current motor transmission field, the four quadrant running and the soft start that comprise motor, be applicable to the high-power application scenario, play input power factor height, whole system four quadrant running, the effect that output High AC voltage harmonic content is low, output AC voltage progression is adjustable, EMI intensity is low.
Claims (10)
1, a kind of cascade multiple indirect matrix converter, it is characterized in that comprising total input filter (1), step-down transformer (2), transducer array (3) and master controller (4), described total input filter (1) is by three filter inductances (L1～L3) and three filter capacitors (C1～C3) constitute, three filter inductance (L1～L3) be serially connected in respectively between the elementary winding of electrical network and step-down transformer (2), (end of C1～C3) interconnects, and the other end links to each other with the elementary winding of step-down transformer (2) respectively for three filter capacitors; Described step-down transformer (2) has 3n three-phase secondary winding, and per 3 secondary winding are one group and have identical phase place, winding phase place difference on the same group not, and initial phase is 0 °, the absolute value of master phase difference is 60 a °/group number between the adjacent set; Described transducer array (3) is lined up the capable array structure of 3 row * n by 3n power converter cells and is constituted, the group of step-down transformer (2) secondary winding respectively with transducer array (3) in capable corresponding, three secondary winding in every group respectively with every row in corresponding one by one linking to each other of three power converter cells; In the transducer array (3), the power take-off of each rank transformation device unit is connected successively, form cross streams voltage output, the output of three rank transformation device unit adopts the Y connection to form three-phase alternating voltage output, and each power converter cells is connected with master controller (4) by signal cable respectively; Described power converter cells is made of a minute input filter (5), synchrotrans (6), power switch array (7) and sub-controller (8), described minute input filter (5) by three filter inductances (L4～L6) and three filter capacitors (C4～C6) constitute, (L4～L6) is serially connected in respectively between the input of the secondary winding of step-down transformer (2) and power switch array (7) for three filter inductances, (end of C4～C6) interconnects, and the other end links to each other with the input of power switch array (7) respectively for three filter capacitors; The elementary winding of described synchrotrans (6) links to each other with the output that divides input filter (5) and the input of power switch array (7), and secondary winding links to each other with the testing circuit of sub-controller (8); Described power switch array (7) is connected and composed by the power switch bridge-type, the prime rectifier is the 3H bridge construction, three brachium pontis mid points link to each other with the output that divides the middle filter inductance of input filter (5), back level inverter is the 2H bridge construction, two contrary type power switch (SI1 that lead, SI3) be connected in series and constitute the 4th brachium pontis, other is two contrary type power switch (SI2 that lead, SI4) be connected in series and constitute the 5th brachium pontis, two brachium pontis mid points form two ac output end (P1, P2), two high-end contrary type power switch (SI1 that lead, SI2) upper end links to each other with the upper end of prime rectifier 3H bridge, two contrary type power switch (SI3 that lead of low side, SI4) lower end links to each other with the lower end of prime rectifier 3H bridge; Described sub-controller (8) is made up of testing circuit, computing modulator, logical circuit and isolation drive protective circuit; testing circuit links to each other with the three-phase output end of synchrotrans (6); the output of testing circuit links to each other with the computing modulator by holding wire; the computing modulator links to each other with logical circuit by holding wire; the isolation drive protective circuit links to each other with logical circuit with the computing modulator, and links to each other with power switch array (7).
2, cascade multiple indirect matrix converter according to claim 1, it is characterized in that in the prime rectifier in the described power switch array (7), (S1～S6) is connected in series in twos and constitutes three brachium pontis for six two-way controlled power switches, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, three high-end two-way controlled power switch (S1, S2, S3) upper end links to each other and directly links to each other three the two-way controlled power switch of low side (S4 with the upper end of back level inverter, S5, S6) lower end links to each other and directly links to each other with the lower end of back level inverter.
3, cascade multiple indirect matrix converter according to claim 1, it is characterized in that in the prime rectifier in the described power switch array (7), three two-way controlled power switch (S1, S2, S3) with three the two-way controlled power switch of sparse type (S4, S5, S6) respectively one by one correspondence be connected in series and constitute three brachium pontis, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, high-end two-way controlled power switch (S1, S2, S3) upper end links to each other and directly links to each other the two-way controlled power switch of the sparse type of low side (S4 with the upper end of back level inverter, S5, S6) lower end links to each other and directly links to each other with the lower end of back level inverter.
4, cascade multiple indirect matrix converter according to claim 1, it is characterized in that in the prime rectifier in the described power switch array (7), (S1～S6) is connected in series in twos and constitutes three brachium pontis for six very sparse two-way controlled power switches, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, three high-end very sparse two-way controlled power switch (S1, S2, S3) upper end links to each other and directly links to each other three very sparse two-way controlled power switch (S4 of low side with the upper end of back level inverter, S5, S6) lower end links to each other and directly links to each other with the lower end of back level inverter.
5, according to the cascade multiple indirect matrix converter of claim 1, it is characterized in that in the prime rectifier in the described power switch array (7), (S1～S3) difference directly constitutes three brachium pontis to three two-way controlled power switches of supersparsity, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, the upper end of three two-way controlled power switches of supersparsity links to each other and directly links to each other with the upper end of back level inverter, and the lower end of three two-way controlled power switches of low side supersparsity links to each other and directly links to each other with the lower end of back level inverter.
6, according to the cascade multiple indirect matrix converter of claim 1, it is characterized in that in the prime rectifier in the described power switch array (7), (S1～S6) is connected in series in twos and constitutes three brachium pontis for six inverse-impedance type power switchs, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, the upper end of three high-end inverse-impedance type power switchs (S1, S2, S3) links to each other and directly links to each other with the upper end of back level inverter, and the lower end of three low side inverse-impedance type power switchs (S4, S5, S6) links to each other and directly links to each other with the lower end of back level inverter.
7, according to the cascade multiple indirect matrix converter of claim 1, it is characterized in that in the prime rectifier in the described power switch array (7), six contrary leads the type power switch (S1～S6) is connected in series in twos and constitutes three brachium pontis, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, three high-end contrary upper ends of leading type power switch (S1, S2, S3) link to each other and directly link to each other with the upper end of back level inverter, and three contrary lower ends of leading type power switch (S4, S5, S6) of low side link to each other and directly link to each other with the lower end of back level inverter.
8, cascade multiple indirect matrix converter according to claim 1, it is characterized in that in the prime rectifier in the described power switch array (7), (S1～S6) is connected in series in twos and constitutes three brachium pontis for six two-way controlled power switches that are made of anti-drag type IGBT inverse parallel, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, three high-end two-way controlled power switch (S1 that constitute by anti-drag type IGBT inverse parallel, S2, S3) upper end links to each other and directly links to each other three the two-way controlled power switch of low side (S4 that are made of anti-drag type IGBT inverse parallel with the upper end of back level inverter, S5, S6) lower end links to each other and directly links to each other with the lower end of back level inverter.
9, according to the cascade multiple indirect matrix converter of claim 1, it is characterized in that in the prime rectifier in the described power switch array (7), (D1～D6) is connected in series in twos and constitutes three brachium pontis for six diodes, the mid point of three brachium pontis is connected with three outputs of minute input transformer respectively, the upper end negative electrode of three high-end diodes (D1, D2, D3) links to each other and directly links to each other with the upper end of back level inverter, and the lower end anode of three low side diodes (D4, D5, D6) links to each other and directly links to each other with the lower end of back level inverter.
10, according to the cascade multiple indirect matrix converter of claim 1, it is characterized in that 3n the three-phase secondary winding that described step-down transformer (2) has, its phase place is all identical.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833037A (en) * | 2010-05-06 | 2010-09-15 | 广州智光电气股份有限公司 | Device and method for detecting input voltage phase of power unit of high voltage frequency converter |
| WO2012122874A1 (en) * | 2011-03-15 | 2012-09-20 | 荣信电力电子股份有限公司 | H-bridge cascaded multi-level voltage sag generator based on igbt |
| CN102891610A (en) * | 2011-07-19 | 2013-01-23 | 安奕极电源系统有限责任公司 | Power supply assembly for a reactor for polysilicon production with a frequency converter |
| CN108011527A (en) * | 2017-12-27 | 2018-05-08 | 北京金风科创风电设备有限公司 | Converter, direct-drive wind generating set and power transmission system |
| CN111624452A (en) * | 2020-05-14 | 2020-09-04 | 广东电网有限责任公司 | High-voltage generator for insulation test of distribution cable |
| CN113595405A (en) * | 2021-08-02 | 2021-11-02 | 河北工业大学 | Common-mode voltage spike problem suppression method for indirect matrix converter |
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2006
- 2006-12-07 CN CN 200610119264 patent/CN1988353A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833037A (en) * | 2010-05-06 | 2010-09-15 | 广州智光电气股份有限公司 | Device and method for detecting input voltage phase of power unit of high voltage frequency converter |
| CN101833037B (en) * | 2010-05-06 | 2012-04-11 | 广州智光电气股份有限公司 | Device and method for detecting input voltage phase of power unit of high voltage frequency converter |
| WO2012122874A1 (en) * | 2011-03-15 | 2012-09-20 | 荣信电力电子股份有限公司 | H-bridge cascaded multi-level voltage sag generator based on igbt |
| CN102891610A (en) * | 2011-07-19 | 2013-01-23 | 安奕极电源系统有限责任公司 | Power supply assembly for a reactor for polysilicon production with a frequency converter |
| CN108011527A (en) * | 2017-12-27 | 2018-05-08 | 北京金风科创风电设备有限公司 | Converter, direct-drive wind generating set and power transmission system |
| CN111624452A (en) * | 2020-05-14 | 2020-09-04 | 广东电网有限责任公司 | High-voltage generator for insulation test of distribution cable |
| CN113595405A (en) * | 2021-08-02 | 2021-11-02 | 河北工业大学 | Common-mode voltage spike problem suppression method for indirect matrix converter |
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