CN1988354A - Cascade multiple zero matrix rectifier - Google Patents
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- CN1988354A CN1988354A CN 200610119261 CN200610119261A CN1988354A CN 1988354 A CN1988354 A CN 1988354A CN 200610119261 CN200610119261 CN 200610119261 CN 200610119261 A CN200610119261 A CN 200610119261A CN 1988354 A CN1988354 A CN 1988354A
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Abstract
This invention relates to a cascade multiple zero-type matrix rectifier, in which, a general input filter is connected between a net and a step-down transformer to get sine-wave input current, the step-down transformer includes n secondary windings with Yn spliced mid lines, the phase of all the three-phase windings is the same, the rectifier array is arrayed in a 1 row x n lines by n zero-matrix rectifier units, each line of which is connected with the seconday winding of the step-down transfornmer, and the outputs of the rectifier units are serial orderly to form a DC output, the general controller is responsible for regulating work of the entire system and connected with the branch controllers by signal cables to control the work of the rectifier units in the array.
Description
Technical field
The present invention relates to a kind of cascade multiple zero matrix rectifier, relate in particular to and a kind ofly be applicable to the three-phase high-voltage DC power supply, adopt the step-down transformer of a plurality of secondary winding and cascaded multiple three-phase zero matrix rectifier, can obtain the cascade multiple zero matrix rectifier of higher magnitude and adjustable amplitude value direct voltage.Belong to the power electronic equipment technical field.
Background technology
In mesohigh high power DC power supply field, comprise that DC motor transmission, high voltage direct current transmission, multi-level inverse conversion take place with DC power supply with DC power supply and laser etc., in order to obtain High Level DC Voltage and higher input power factor, usually adopt the technical scheme of control rectifier-electrochemical capacitor group of the transformer of a plurality of secondary winding-not, wherein according to different concrete schemes, transformer can adopt the Industrial Frequency Transformer or the high frequency transformer of secondary winding phase shift.The weak point of these technical schemes is or input power factor is low, control is complicated, does not possess energy two-way flow ability, and needs short electrochemical capacitor of life-span as energy-storage travelling wave tube, the transformer secondary output winding also needs phase shift, and the direct voltage size is not easy to regulate with polarity.If adopt the technical scheme of the transformer-controlled rectifier-electrochemical capacitor group of a plurality of secondary winding, though can obtain higher input power factor, energy can two-way flow, and above-mentioned deficiency still exists.Therefore in high-power DC power supply application, objectively need a kind of novel technical scheme to occur, it need possess following feature: (1) adopts the cascaded multiple scheme, to reduce the power capacity of rectifier unit; (2) the step-down transformer scheme of a plurality of homophase secondary winding of employing is with withstand voltage capacity and the design of simplification Secondary winding of transformer that reduces rectifier unit; (3) do not need the electrochemical capacitor energy-storage travelling wave tube, to improve machine life; (4) energy two-way flow, power factor are 1, and the amplitude and the polarity of output HIGH voltage are adjustable, and to improve the utilance of net capacity, the harmonic current of eliminating electrical network pollutes, and strengthens the controllability of complete machine; (5) cost is low, and the life-span is long, reliability height, the developing direction of suitable following mesohigh electronic power rectifier.The mesohigh high-power DC power supply technical scheme that can satisfy above condition can only be the cascade multiple zero matrix rectifier of high pressure-low pressure-high pressure type.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 kind of cascade multiple zero matrix rectifier, 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 rectifier array and the master controller that total input filter, the step-down transformer with a plurality of three-phase secondary winding, zero matrix rectifier unit constitute.Step-down transformer input high pressure three-phase alternating voltage, the low-voltage three-phase AC voltage that the many groups of output are isolated, every group of corresponding three-phase secondary winding of low-voltage three-phase AC voltage, the phase place of all three-phase secondary winding is identical.Rectifier unit be input as three-phase alternating voltage, be output as voltage magnitude and phase place adjustable DC voltage.The quantity of three-phase secondary winding is identical with the quantity of rectifier unit in the rectifier array, all rectifier units constitute row, the output of the rectifier unit in the row links to each other successively, final output amplitude and phase place adjustable DC voltage, obtain the output voltage capability of multiplication, the quantity of rectifier unit is many more in the row, and the amplitude of output dc voltage is high more.Master phase in the row between the three-phase secondary winding of rectifier unit correspondence is zero.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 rectifier unit comprises a sub-controller, is responsible for the switching rule of power device in each rectifier unit 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 direct voltage load size, the rectifier array can the adjustable high-voltage dc voltage of output amplitude, satisfy the needs of DC load, simultaneously obtain sine-shaped input current waveform at the electrical network input, electrical network is not had harmonic current pollute, between rectifier array and the load, between the three-phase secondary winding of rectifier 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 input of the elementary winding of step-down transformer, its other end interconnects, and forms a common point.
Step-down transformer of the present invention has 1 elementary winding and a plurality of Yn connects the three-phase secondary winding, 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 transformer respectively, and each three-phase low-voltage secondary winding links to each other with a rectifier unit in the rectifier array respectively.
Rectifier array of the present invention is made of a plurality of rectifier units, and is identical with the quantity of the secondary winding of step-down transformer, and wherein all rectifier units are arranged in a row multirow structure.The step-down transformer secondary winding respectively with the rectifier array in capable corresponding.The power take-off of rectifier unit is connected successively in the array, forms the output of one road direct voltage, comprises two lead-out terminals, and a lead-out terminal is as positive pole, and another output is as negative pole.Each rectifier unit is connected with master controller by signal cable respectively.
Described rectifier unit 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 Yn connects elementary winding and 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 connects into the 3H bridge construction by six two-way gate-controlled switches, and two outputs of bridge are the power take-off of rectifier unit.
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 rectifier unit.
The present invention is with the output of the rectifier unit in rectifier array series connection, realized the cascaded multiple of DC converter, obtained amplitude and polarity is adjustable, the direct voltage output of voltage multiplication, be adapted to the needs of mesohigh direct current supply, the branch input current of rectifier unit 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 of total input current is zero under the control of sub-controller and master controller, realize the unit input power factor, thereby obtained the cascaded multiple mesohigh DC converter of novel high-pressure-low pressure-high pressure type, and the whole system structure has all possessed the two-way flow ability of energy, not only can obtain the high voltage direct current output of adjustable amplitude value, 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 DC 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 the rectifier array, and 4 is master controller.
Fig. 2 is the circuit theory diagrams of the zero matrix rectifier unit in Fig. 1 rectifier 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 is applied to embodiment circuit theory diagrams in multi-electrical level inverter-high voltage motor transmission speed-regulating system for the present invention.
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 duties connection multiple zero matrix rectifier with the present invention's design is that example describes, and structure is made of total input filter 1, step-down transformer 2, rectifier 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 connects low pressure three-phase four-wire system secondary winding by a three-phase primary high pressure winding, 5 Yn and magnetic core is formed, three outputs of the filter inductance in elementary winding and the total input filter 1 link to each other, secondary winding is divided into 5 groups, has identical phase place, be connected respectively to the rectifier unit in the rectifier array 3, magnetic core provides magnetic circuit, realizes the magnetic circuit coupling between elementary winding and the secondary winding.Rectifier array 3 is made up of=5 rectifier units of 1 row * 5 row, be arranged in array structure, the three-phase input end of each rectifier unit links to each other with the three-phase output end of a three-phase secondary winding of step-down transformer, the power output of 5 rectifier units links to each other successively, forms two high voltage direct current output ends 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 rectifier unit.
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, and the output of 5 three-phase secondary low-voltage windings links to each other with the input of 5 zero matrix rectifier units in the rectifier array respectively.
In the rectifier array 3, the output of rectifier unit U4 links to each other with the output of rectifier unit U5, another output of U4 links to each other with the output of rectifier unit U3, the output of rectifier unit U2 links to each other with another output of rectifier unit U3, another output of U2 links to each other with the output of rectifier unit U1, another output of rectifier unit U1 becomes cathode output end N, and another output of rectifier unit U5 becomes cathode output end P.
Rectifier unit U5～U1 links to each other respectively with the three-phase output end of a secondary winding respectively, and rectifier unit U5～U1 links to each other with master controller by signal cable PU5～PU1 respectively.
In the master controller 4, master controller is connected with zero matrix rectifier unit U5～U1 in the rectifier array respectively by signal cable PU5～PU1.
Zero matrix rectifier unit structure in the rectifier 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, the other end of three filter capacitors interconnects, and links to each other with the neutral line.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 made up of 6 two-way controlled power switches, constitute the 3H bridge construction, each brachium pontis comprises two two-way controlled power switches, 3 brachium pontis mid points link to each other with the output of minute input filter, one end of three two-way controlled power switches of last brachium pontis is joined together to form one road output, and an end of three two-way controlled power switches of following brachium pontis is joined together to form another road output.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 with the power switch array of zero matrix rectifier 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, after linking to each other with the end of filter capacitor C4, C5 and C6 respectively, the other end links to each other with the elementary winding of synchrotrans, power switch array input, the other end of filter capacitor C4, C5 and C6 interconnects, and links to each other with the neutral line.
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, one end of two-way controlled power switch S 1 is connected with the output that divides input filter inductance L 1, one end of two-way controlled power switch S 2 is connected with the output that divides input filter inductance L 2, one end of two-way controlled power switch S 1 is connected with the output that divides input filter inductance L 3, the other end of two-way controlled power switch S 1, S2 and S3 is interconnected to form an ac output end P1, and the neutral line is as another dc output end P2.
In the sub-controller 8, testing circuit links to each other with the secondary winding of synchrotrans, and the isolation drive protective circuit links to each other with the power switch array by signal cable.
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, pass through electromagnetic induction, in secondary winding, obtain 5 tunnel low-voltage ac voltages of isolating, adopt the Yn of the band neutral line to connect, be three-phase four-wire system, the low-voltage rectifier array of being made up of the zero matrix rectifier unit for the back level uses.
(3) in the rectifier array 3, each zero matrix rectifier unit is exported the direct voltage of the adjustable amplitude value of one tunnel low pressure, all rectifier units adopt identical control strategy, 5 rectifier units adopt the identical modulation strategy of output voltage feature, series connection is carried out in its output, the input voltage phase of 5 row rectifier units is identical and be 0 °, obtain the high-voltage dc voltage of the adjustable amplitude value of voltage magnitude multiplication like this, and output dc voltage is many level, add that the zero matrix rectifier is exactly many level in essence, the level number of output dc voltage is more, means that the first-harmonic content of output dc voltage is higher.Each rectifier unit 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 all rectifier units, for the better direct 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 rectifier unit is under the coordination control of master controller; be responsible for detecting the information of rectifier unit 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-direct 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.
Rectifier unit formation 1 row n in the rectifier array is capable, and n generally 〉=3 can satisfy the more VD needs of wide region, and output voltage amplitude can surpass the amplitude of line voltage.
(3) in the master controller 4, master controller by signal cable PU5～PU1 respectively with the rectifier array in zero matrix rectifier unit U5～U1 carry out information exchange, carry out totally control.
Total input filter of the present invention, step-down transformer, the rectifier array and the master controller that are made of rectifier unit are inseparable part, can not analyze separately simply, thereby constitute cascade multiple zero matrix rectifier.The essence of operation principle is: step-down transformer is finished the conversion by High AC voltage-low-voltage dc voltage, is the low power zero matrix rectifier unit power supply of low pressure.Each rectifier unit can convert the three-phase low-voltage ac voltage to the low-voltage dc voltage of one tunnel adjustable amplitude value, obtains the high-voltage dc voltage of one tunnel adjustable amplitude value after the output series connection of rectifier unit, for mesohigh direct current using electricity system provides DC power supply.Because rectifier unit is a direct 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 unity power factor, not only obtained the high-power DC power supply, and possessed power environment protection feature completely in essence, the components and parts in low life-span have been eliminated simultaneously, it is low to have cost, the efficient height, simple in structure, the reliability advantages of higher, the progression of cascaded multiple can increase and reduce in addition, therefore is highly suitable for high-power direct current supply 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; The rectifier unit supply power voltage can be selected direct current effective value 1140V, 660V and 380V voltage level, and 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 and peripheral numeral or analog circuit, 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.
Fig. 3 is the embodiment of cascade multiple zero matrix rectifier of the present invention in the multi-electrical level inverter-high voltage motor alternating-current actuating system of high-power high voltage direct current supply.
By shown in Figure 3, the input of cascade multiple zero matrix rectifier applies the three-phase main-frequency sine DC voltage source of high pressure, motor rated voltage effective value is 3.3kV, power output is about 150kW, cascade multiple zero matrix rectifier adopts 5 heavily to change scheme, each rectifier unit only need bear the voltage strength of 380V, share the power of 10kW, can satisfy the power reguirements of DC motor variable voltage variable frequency, improve the whole efficiency of the multi-electrical level inverter-high voltage motor alternating-current actuating system of cascade multiple zero matrix rectifier-high power DC power supply, in addition because the efficient of cascade multiple zero matrix rectifier is high and the power utilization height, so the cost of whole system has the space of decline.
Obviously, cascade multiple zero matrix rectifier of the present invention can be applied in the multi-electrical level inverter-high voltage motor alternating-current actuating system of high-power mesohigh direct current supply, 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-voltage dc voltage harmonic content is low, output dc voltage progression is adjustable, EMI intensity is low.
Claims (1)
1, a kind of cascade multiple zero matrix rectifier, it is characterized in that comprising total input filter (1), step-down transformer (2), rectifier 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 n three-phase secondary winding, has the phase place that is all 0 ° mutually; Described rectifier array (3) is lined up the capable array structure of 1 row * n by n rectifier unit and is constituted, the secondary winding of step-down transformer (2) respectively with rectifier array (3) in capable corresponding, each secondary winding respectively with every row in corresponding one by one link to each other of rectifier unit, the power take-off of rectifier unit is connected successively in the rectifier array (3), form the output of one road direct voltage, each rectifier unit is connected with master controller (4) by signal cable respectively; Described rectifier unit 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 for three filter capacitors, and link to each other with the neutral line, the other end links to each other with the input of power switch array (7) respectively; 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) connects into zero formula structure by three two-way gate-controlled switches, and its output is a power output (P1) of rectifier unit, and another is output as the neutral line (N1); 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).
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| CN 200610119261 CN1988354A (en) | 2006-12-07 | 2006-12-07 | Cascade multiple zero matrix rectifier |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540580B (en) * | 2008-03-18 | 2012-03-14 | 新能动力（北京）电气科技有限公司 | Electric energy feedback device |
| CN102801342A (en) * | 2012-08-09 | 2012-11-28 | 郭高朋 | Rectification circuit capable of approximating AC side current to sine wave and control method |
| CN110361591A (en) * | 2019-08-15 | 2019-10-22 | 杭州电子科技大学 | Three-phase alternating current high-precision quick detection circuit based on mutual inductor |
| CN114553047A (en) * | 2022-01-21 | 2022-05-27 | 东北电力大学 | Three-phase AC-DC converter based on three-phase transformer cascade connection |
-
2006
- 2006-12-07 CN CN 200610119261 patent/CN1988354A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101540580B (en) * | 2008-03-18 | 2012-03-14 | 新能动力（北京）电气科技有限公司 | Electric energy feedback device |
| CN102801342A (en) * | 2012-08-09 | 2012-11-28 | 郭高朋 | Rectification circuit capable of approximating AC side current to sine wave and control method |
| CN110361591A (en) * | 2019-08-15 | 2019-10-22 | 杭州电子科技大学 | Three-phase alternating current high-precision quick detection circuit based on mutual inductor |
| CN110361591B (en) * | 2019-08-15 | 2021-05-11 | 杭州电子科技大学 | Three-phase alternating current high-precision rapid detection circuit based on mutual inductor |
| CN114553047A (en) * | 2022-01-21 | 2022-05-27 | 东北电力大学 | Three-phase AC-DC converter based on three-phase transformer cascade connection |
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