CN101364732A - Large power modularized DC power supply apparatus and control method thereof - Google Patents

Abstract

The invention relates to a large-power modularized DC power supply device and a control method thereof. The large-power modularized DC power supply device is composed of three two-way power units and a transformer with zigzag connection. Each two-way power unit includes twelve reverse-conducting IGBTs forming six bridge arms, wherein each bridge arm is connected with primary windings Tx1, Tx2 and Tx3 of the transformer with zigzag connection. A voltage and current sensor is also connected. The AC-side voltage of the two-way power unit is superposed with the phases of fifteen secondary windings in zigzag connection; a filter capacitor is connected between every two phases to generate three-phase symmetrical 18 ladder wave AC line voltages; and the DC sides of the two-way power units are connected with each other in parallel. The power supply device and the control method thereof have the advantages of stable DC output voltage, fast system response, good controllability, and less harmonic wave pollution at the AC sides, and particularly can achieve energy feedback from the DC side to the AC side and two-way energy transmission between the DC side and the AC side, thereby achieving positive effect on energy saving and emission reduction.

Description

Large power modularized DC power supply apparatus and control method thereof

Technical field

The present invention relates to a kind of direct current supply field, be meant a kind of large power modularized DC power supply apparatus and control method thereof especially.

Background technology

The direct current supply field is the important industry that involves the interests of the state and the people that present country greatly develops, and DC power supply apparatus all has important application in fields such as urban track traffic, mine traction, harbour cranes, has a extensive future.But present DC power supply apparatus remains in application in many problems.Tractive power supply system with urban track traffic is that example describes below.

750V and two kinds of direct current supply standards of 1500V are mainly adopted in urban track traffic at present, generally adopt 12 pulse waves or 24 pulse wave diodes not to control rectification.This supply power mode is used till today history decades, has that apparatus structure is simple, the advantage of dependable performance.But be to use this device, the direct voltage of power supply is uncontrollable, output voltage fluctuation big, also very outstanding to problems such as the harmonic pollution of AC network are big.In addition, because city rail vehicle needs frequent starting and braking, and when vehicle started fast, the traction power that needs was very big, and the direct voltage of not controlled rectification output by diode can fall rapidly, and the output characteristic of device is very soft; When car brakeing, can cause DC side energy accumulation, VD to raise, because diode has unilateral conduction in the existing apparatus, thereby the excess energy of DC side can't be fed back to the AC side electrical network, must add extra device in addition these energy are handled.

At present in the urban track traffic tractive power supply system, when car brakeing, handle the DC side accumulation energy, prevent that dc voltage from raising the major technique means that adopted and having: use braking resistor, use energy accumulation device for fly wheel, use capacitive energy storage device, use the thyristor inverter.When using braking resistor, the energy of DC side still can't carry out feedback in the electric power system, just by braking resistor unnecessary electric energy is converted into finally being dissipated in the air of heat energy.Make in this way obviously not reach the purpose that the DC side electric energy is fed back to AC side, only played the effect of restriction dc voltage, the energy consumption that DC side is unnecessary is fallen, and energy dissipation is serious; Use energy accumulation device for fly wheel the excess energy of DC side can be stored temporarily among the flywheel of high speed rotating, when the DC power-supply system load strengthened, energy accumulation device for fly wheel can discharge the energy that is stored in the flywheel.This mode is compared with adopting the brake resistance mode, and the excess energy of DC side can be cached in the flywheel, has avoided the waste of energy.But because flywheel is the precision optical machinery parts, although adopted relevant bearing technology, its life-span is still limited, and maintenance and replacing are got up very complicated.Because relevant apparatus is domestic can not be produced, complete dependence on import, price is very expensive, has also strengthened the cost of DC power-supply system greatly; Use capacitive energy storage device, its function is similar with the use energy accumulation device for fly wheel, the excess energy of DC side can be carried out buffer memory, discharges in case of necessity again.It is less that but this type of installs general capacity, and the finite energy that can store can not satisfy the needs of high-capacity direct current electric power system DC side energy feedback fully.And relevant apparatus is domestic still can't be made, and costs an arm and a leg, and cost is higher; Use the thyristor inverter, dc energy can be reverse into AC energy to the AC side feedback by inverter.But owing to what adopt in the existing apparatus is phase controlled thyristors, and when DC side energy feedback AC side, the harmonic content that device is input to AC network is very big, has influenced the power supply quality of AC network, and using also has weak point.

In sum, develop that a kind of dc voltage is stable, faster system response, controllability is good, the AC side harmonic pollution is little, particularly realize the DC side energy can to the energy of AC side feedback, alternating current-direct current both sides can transmitted in both directions the Novel DC electric supply installation significant, can play very positive effect for energy-saving and emission-reduction.

Summary of the invention

The objective of the invention is to avoid above-mentioned weak point of the prior art and a kind of large power modularized DC power supply apparatus and control method thereof are provided, purpose is to provide a kind of high performance electric supply installation for DC power-supply system.This device output dc voltage is stable, the DC side energy of device can be carried out feedback to the AC network of device AC side, and little to the AC network harmonic pollution.Because described device is to adopt a plurality of identical bidirectional power unit multipleization parallel operations; thereby in the application of reality, can choose the group number of bidirectional power unit in the electric supply installation flexibly according to the load condition on the direct current supply line; and when certain bidirectional power unit is carried out General Maintenance or it is when breaking down; can be directly the bidirectional power unit is online takes off with this; and can not produce any influence to the working condition of other bidirectional power unit in the whole system; thereby maintenance and the maintenance of doing auto levelizer are not shut down; do not cut off the power supply; the reliability height of DC power-supply system, and high modularization.

Purpose of the present invention can reach by following measure:

Large power modularized DC power supply apparatus is made up of with the tortuous transformer that is connected the bidirectional power unit,

The bidirectional power unit is constructed as follows: three bidirectional power unit are arranged in the device, the DC side parallel of each bidirectional power unit, each bidirectional power unit concrete connecting and composing of each device is: the contrary guiding shape tube Gx1L of 12 inverse parallel diodes, Gx2L, Gx3L, Gx4L, Gx5L, Gx6L, Gx1R, Gx2R, Gx3R, Gx4R, Gx5R, Gx6R, wherein Gx1L and Gx4L, Gx2L and Gx5L, Gx3L and Gx6L, Gx1R and Gx4R, Gx2R and Gx5R, Gx3R and Gx6R series connection form six brachium pontis, brachium pontis just, negative two ends are parallel to respectively together, the positive termination of brachium pontis is used to measure the right-hand member of average anode current Sx2, after being connected together, the negative terminal of brachium pontis meets the direct current negative busbar N of bidirectional power unit, the left end of Sx2 meets the direct current positive bus P of bidirectional power unit, the last termination P of direct voltage transducer Sx1, following termination N, C _DxPositive pole receive the right-hand member of Sx2, negative pole is received on the N.Each bidirectional power unit has also inserted wherein three elementary winding Tx1 of the transformer of tortuous connection, Tx2, Tx3, wherein the tie point of Gx1L and Gx4L is received the left end of Sx3, the right-hand member of Sx3 is received the end of the same name of Tx1, the non-same polarity of Tx1 is received the tie point of Gx1R and Gx4R, Gx2L and Gx5L tie point are received the left end of Sx4, the right-hand member of Sx4 is received the end of the same name of Tx2, the non-same polarity of Tx2 is received the tie point of Gx2R and Gx5R, the tie point of Gx3L and Gx6L is received the end of the same name of Tx3, the non-same polarity of Tx3 is received the tie point of Gx3R and Gx6R, terminate to the left end of Sx3 on the measurement two-phase alternating current pressure Sx5, the following left end that terminates to Sx4 of Sx5, terminate to the left end of Sx4 on the measurement two-phase alternating current pressure Sx6, the following end of the same name that terminates to Tx3 of Sx6;

The tortuous transformer that connects is formed as follows: the elementary winding of each single-phase transformer is: the elementary winding that connects three single-phase transformers of No. 1 bidirectional power unit is T11, T12, T13, the elementary winding that connects three single-phase transformers of No. 2 bidirectional power unit is T21, T22, T23, the elementary winding that connects three single-phase transformers of No. 3 bidirectional power unit is T31, T32, T33, has nine elementary windings;

The secondary winding of each single-phase transformer is: three single-phase transformers that connect No. 1 bidirectional power unit respectively have secondary winding T11-1, a T12-1, T13-1, three single-phase transformers that connect No. 2 bidirectional power unit respectively have two secondary winding T21-1, T21-2, T22-1, T22-2, T23-1, T23-2, three single-phase transformers that connect No. 3 bidirectional power unit respectively have two secondary winding T31-1, T31-2, T32-1, T32-2, T33-1, T33-2, totally ten five secondary winding;

T11-1 of the same name terminates on the A phase terminal of device AC side, the non-same polarity of T11-1 is received the end of the same name of T21-1, the non-same polarity of T21-1 is received the non-same polarity of T22-2, the end of the same name that terminates to T31-1 of the same name of T22-2, the non-same polarity of T31-1 is received the non-same polarity of T32-2, the mid point of the termination three-phase of the same name of T32-2;

T12-1 of the same name terminates on the B phase terminal of device AC side, the non-same polarity of T12-1 connects the end of the same name of T22-1, the non-same polarity of T22-1 connects the non-same polarity of T23-2, the end of the same name of the termination T32-1 of the same name of T23-2, the non-same polarity of T32-1 connects the non-same polarity of T33-2, the mid point of the termination three-phase of the same name of T33-2;

T13-1 of the same name terminates on the C phase terminal of device AC side, the non-same polarity of T13-1 connects the end of the same name of T23-1, the non-same polarity of T23-1 connects the non-same polarity of T21-2, the end of the same name of the termination T33-1 of the same name of T21-2, the non-same polarity of T33-1 connects the non-same polarity of T31-2, the mid point of the termination three-phase of the same name of T31-2;

The elementary winding of each single-phase transformer and the turn ratio of secondary winding are:

The turn ratio=1:K of T11:T11-1, T12:T12-1 and T13:T13-1 ₁=1:K*cos30 °;

The turn ratio=1:K of T21:T21-1, T22:T22-1 and T23:T23-1 ₂=1:K*cos50 °;

The turn ratio=1:K of T21:T21-2, T22:T22-2 and T23:T23-2 ₃=1:K*cos70 °;

The turn ratio=1:K of T31:T31-1, T32:T32-1 and T33:T33-1 ₃=1:K*cos70 °;

The turn ratio=1:K of T31:T31-2, T32:T32-2 and T33:T33-2 ₂=1:K*cos50 °;

K value in the above-mentioned expression formula determines that according to the dc voltage of the actual output of described DC power supply apparatus and the relativeness of AC side line voltage concrete definite method is:

Wherein, U _AcBe the amplitude of AC side line voltage, U _DcDirect voltage for the device DC side.

Filter capacitor C _F1The two ends A mutually and on the B phase terminal that receives device respectively, filter capacitor C _F2The two ends B mutually and on the C phase terminal that receives device respectively, filter capacitor C _F3The two ends A mutually and on the C phase terminal that receives device respectively.

Contrary guiding shape tube has adopted the Intelligent Power Module IPM of current detection circuit inner integrated, can save AC current sensor.

The concrete steps of described control method are:

The 1st step: the set-point of operative installations dc voltage

Voltage U with the device DC side _DcVoltage to the device DC side in outer voltage carries out close loop negative feedback control.The output of PI controller 1 is as the set-point of current inner loop d shaft current (active current) in the outer voltage

And the set-point of q shaft current (reactive current)

Constant is 0;

The 2nd step: in control procedure, pass through device AC side voltage u _a, u _bObtain line voltage synchro angle α;

The 3rd step: utilize angle α, adopt method of coordinates transform with the device ac-side current i in the three phase static coordinate system _a, i _bConvert the d shaft current i of the device AC side in the synchronous rotating frame to _dWith q shaft current i _q

The 4th step: PI controller 2 and PI controller 3 use In conjunction with i _d, i _qIn current inner loop, d shaft current and q shaft current are carried out close loop negative feedback control.The output that encircles in the d shaft current in the current inner loop is as the set-point of the d shaft voltage of device output

The output of ring is as the set-point of the q shaft voltage of device output in the q shaft current

The 5th step: by

Calculate corresponding β ^*(the given angle of device AC side output voltage amplitude is corresponding to device AC side output voltage amplitude set-point) and γ ^*(the given angle of phase place of device AC side output voltage is corresponding to the phase place set-point of device AC side output voltage);

The 6th step: use the phase angle [alpha] of line voltage and the β that combination draws ^*And γ ^*, (G11R G14R), through after the phase shift, produces the phase shift square wave driving signal of 180 ° of each road pulsewidths, change frequency 50Hz, drives the power switch pipe work in each bidirectional power unit for G11L, G14L to produce four tunnel basic drive signals.

Wherein, the concrete implementation step of the driving signal of power switching tube production method in the 6th step is:

1. produce four tunnel basic drive signals (G11L, G14L, the drive signal of G11R and G14R).

180 ° of generation two-way pulsewidths, change frequency 50Hz, phase place are respectively α+γ ^*+ β ^*/ 2 and α+γ ^*-β ^*/ 2 square-wave signal is as the drive signal of G11L and G11R, and the two-way drive signal of G14L and G14R is obtained by the drive signal negate of G11L and G11R respectively.

2. on the basis of four tunnel basic drive signals, carry out phase shift, produce other each road drive signals.

Total drive signal needs 36 the tunnel altogether, poor between the phase place of the drive signal of the phase place of each road drive signal and power switch pipe G11L, and promptly each road drive signal is as shown in table 1 with respect to the phase shifting angle of the drive signal of G11L.β in the table ^*It is the given angle of aforesaid device AC side output voltage amplitude.

G11L	0°	G21L	20°	G31L	40°
						G12L	120°	G22L	140°	G32L	160°
G13L	240°	G23L	260°	G33L	280°
						G14L	180°	G24L	160°	G34L	140°
G15L	60°	G25L	40°	G35L	20°
						G16L	-60°	G26L	-80°	G36L	-100°
G11R	0°-β *	G21R	20°-β *	G31R	40°-β *
						G12R	120°-β *	G22R	140°-β *	G32R	160°-β *
G13R	240°-β *	G23R	260°-β *	G33R	280°-β *
						G14R	180°+β *	G24R	160°+β *	G34R	140°+β *
G15R	60°+β *	G25R	40°+β *	G35R	20°+β *
						G16R	-60°+β *	G26R	-80°+β *	G36R	-100°+β *

Table 1 drive signal phase shifting angle table

According to the phase shifting angle in the table 1, in conjunction with β ^*, just can on the basis of four tunnel basic drive signals, carry out phase shift, produce 36 tunnel whole drive signals.

The present invention has following advantage compared to existing technology:

(1) adopted a plurality of bidirectional powers unit in the described DC power supply apparatus, the AC side of each bidirectional power unit realizes voltage stack, DC side parallel work by the tortuous transformer that connects, the DC side supply power voltage of device is stable, AC side power factor height, harmonic content are little, and the energy of alternating current-direct current both sides can two-way flow, the excess energy of DC side can be to the feedback of AC side electrical network, and energy-saving effect is obvious;

(2) adopt the modularization working method in the described DC power supply apparatus, each bidirectional power unit has a module of one's own, each module height is integrated, can select the quantity of the bidirectional power unit module of the actual use of described DC power supply apparatus according to the capacity needs of actual power system flexibly, very convenient.The DC power-supply system of using described DC power supply apparatus to power, simplicity of design, dilatation is easy;

(3) each bidirectional power unit can on-bne repair and maintenance in the described DC power supply apparatus, and the maintenance of DC power-supply system and safeguard and can accomplish not shut down is not cut off the power supply;

(4) each power switch pipe all adopts square wave control in the described DC power supply apparatus, and operating frequency is power frequency 50Hz, and switching loss is little, the efficient height of whole device;

(5) adopt voltage and current double closed-loop control method based on synchronous rotating frame in the control method of described DC power supply apparatus, the DC side output voltage stabilization of whole device, dynamic response are fast;

(6) method that adopts d shaft current (active current) and q shaft current (reactive current) to control respectively in the described DC power supply apparatus, make that the active power and the reactive power of device transmission can be controlled respectively, be convenient to the High Power Factor operation of implement device.

Description of drawings

The described large power modularized DC power supply apparatus block diagram of system of Fig. 1;

Fig. 2 bidirectional power cellular construction figure;

The tortuous transformer connection figure that connects of Fig. 3;

The described DC power supply apparatus main circuit structure of Fig. 4 figure;

The described DC power supply apparatus control of Fig. 5 block diagram;

The described DC power supply apparatus equivalent circuit diagram of Fig. 6;

The described DC power supply apparatus unity power factor of Fig. 7 rectification vectogram;

The described DC power supply apparatus unity power factor of Fig. 8 contravariant vector figure.

Embodiment

As follows below in conjunction with description of drawings:

Please refer to the described large power modularized DC power supply apparatus block diagram of system of Fig. 1, large power modularized DC power supply apparatus is made up of with the tortuous transformer that is connected the bidirectional power unit.Three bidirectional power unit are arranged in the device, and to realize the power conversion of alternating current-direct current both sides: the AC side voltage of each bidirectional power unit is superposeed by the transformer that complications connect, and produces three 18 symmetrical staircase waveform ac line voltages; The DC side parallel work of each bidirectional power unit.The tortuous transformer that connects can also play the effect of isolation simultaneously.Adopt this frame mode, described DC power supply apparatus has realized the modularization of bidirectional power unit and the multipleization parallel operation of each bidirectional power unit module, has enlarged power supply capacity, has improved the redundancy and the reliability of device.

Please refer to Fig. 2 bidirectional power cellular construction figure, three its structures of bidirectional power unit in the described DC power supply apparatus are identical.X value in each symbol is 1,2,3, respectively corresponding three bidirectional power unit.Each bidirectional power unit comprises: 12 contrary guiding shape tube IGBT (Gx1L, Gx2L, Gx3L, Gx4L, Gx5L, Gx6L, Gx1R, Gx2R, Gx3R, Gx4R, Gx5R, Gx6R; So-called contrary lead type and be meant that each IGBT has the reverse flow of an inverse parallel diode with implement device DC side energy), direct current supports capacitor C _DxDirect voltage transducer Sx1, DC current sensor Sx2, AC current sensor Sx3 and Sx4, AC voltage sensor Sx5 and Sx6, in addition, each bidirectional power unit has also inserted wherein three elementary winding Tx1, Tx2, the Tx3 of the transformer of tortuous connection.

In each bidirectional power unit, the bidirectional power unit can be divided into leading side and two parts of hysteresis side according to the triggering phase angle of each driving signal of power switching tube.Leading side comprises Gx1L, Gx2L, Gx3L, Gx4L, Gx5L and Gx6L, and the hysteresis side comprises Gx1R, Gx2R, Gx3R, Gx4R, Gx5R and Gx6R.Per two IGBT are composed in series a brachium pontis, and 12 power switch pipes of each bidirectional power unit are formed six brachium pontis (Gx1L and Gx4L, Gx2L and Gx5L, Gx3L and Gx6L, Gx1R and Gx4R, Gx2R and Gx5R, Gx3R and Gx6R form a brachium pontis respectively in twos) altogether.The difference of the phase place of the alternating voltage that foundation is exported can be divided into A, B, C three-phase with six brachium pontis.A comprises mutually: Gx1L, Gx4L, Gx1R, Gx4R, wherein Gx1L is positioned at the top position of the brachium pontis of leading side, Gx1R is positioned at the lower position of the brachium pontis of hysteresis side, Gx4L and Gx4R are respectively the power switch pipes with their locations complementary, the mid point of the brachium pontis of the mid point of the brachium pontis of Gx1L and Gx4L and Gx1R and Gx4R respectively as A mutually about two outputs; B comprises mutually: Gx2L, Gx5L, Gx2R, Gx5R, wherein Gx2L is positioned at the top position of the brachium pontis of leading side, Gx2R is positioned at the lower position of the brachium pontis of hysteresis side, Gx5L and Gx5R are respectively the power switch pipes with their locations complementary, the mid point of the brachium pontis of the mid point of the brachium pontis of Gx2L and Gx5L and Gx2R and Gx5R respectively as B mutually about two outputs; C comprises mutually: Gx3L, Gx6L, Gx3R, Gx6R, wherein Gx3L is positioned at the top position of the brachium pontis of leading side, Gx3R is positioned at the lower position of the brachium pontis of hysteresis side, Gx6L and Gx6R are respectively the power switch pipes with their locations complementary, the mid point of the brachium pontis of the mid point of the brachium pontis of Gx3L and Gx6L and Gx3R and Gx6R respectively as C mutually about two outputs.

The concrete connected mode of each device is: the two ends up and down of six brachium pontis are parallel to respectively together: connect the right-hand member of Sx2 after a top end links together, below an end meet the direct current negative busbar N of bidirectional power unit after linking together; The left end of Sx2 meets the direct current positive bus P of bidirectional power unit; The last termination P of Sx1, following termination N; C _DxPositive pole receive the right-hand member of Sx2, negative pole is received on the N.The left output of A phase is received the left end of Sx3, and the right-hand member of Sx3 is received the end of the same name of Tx1, and the non-same polarity of Tx1 is received the right output of A phase; The left output of B phase is received the left end of Sx4, and the right-hand member of Sx4 is received the end of the same name of Tx2, and the non-same polarity of Tx2 is received the right output of B phase; The left output of C phase is received the end of the same name of Tx3, and the non-same polarity of Tx3 is received the right output of C phase; Terminate to the left end of Sx3 on the Sx5, the following left end that terminates to Sx4 of Sx5; Terminate to the left end of Sx4 on the Sx6, the following left output that terminates to the C phase of Sx6.

Described direct current supports capacitor C _DxBe used for filtering direct voltage ripple, stable DC voltage; Described Sx1 is used to measure direct voltage U _DcDescribed Sx2 is used to measure average anode current I _DcDescribed Sx3 and Sx4 are used to measure two-phase alternating current i _aAnd i _bDescribed Sx5 and Sx6 are used to measure two-phase alternating current and press u _aAnd u _b

Contrary guiding shape tube has adopted the Intelligent Power Module IPM of current detection circuit inner integrated, can save AC current sensor.

Please refer to the winding diagram of the tortuous transformer that connects of Fig. 3, the tortuous transformer that connects is made up of nine single-phase transformers altogether in the described DC power supply apparatus.

The elementary winding of each single-phase transformer is: the elementary winding that connects three single-phase transformers of No. 1 bidirectional power unit is T11, T12, T13, the elementary winding that connects three single-phase transformers of No. 2 bidirectional power unit is T21, T22, T23, the elementary winding that connects three single-phase transformers of No. 3 bidirectional power unit is T31, T32, T33 has nine elementary windings;

The secondary winding of each single-phase transformer is: three single-phase transformers that connect No. 1 bidirectional power unit respectively have a secondary winding (T11-1, T12-1, T13-1), three single-phase transformers that connect No. 2 bidirectional power unit respectively have two secondary winding (T21-1, T21-2, T22-1, T22-2, T23-1, T23-2), three single-phase transformers that connect No. 3 bidirectional power unit respectively have two secondary winding (T31-1, T31-2, T32-1, T32-2, T33-1, T33-2), totally ten five secondary winding.

The elementary winding of each single-phase transformer and the end of the same name of secondary winding are shown in " * " among Fig. 3.The other end of each elementary winding and secondary winding is non-same polarity.

The tortuous concrete connected mode of transformer that connects is: T11, T21, the end of the same name of T31 is received the left side output of 1,2, No. 3 bidirectional power unit A phase, T11 respectively, T21, the non-same polarity of T31 receive the right side output of 1,2, No. 3 bidirectional power unit A phase respectively; T12, T22, the end of the same name of T32 is received the left side output of 1,2, No. 3 bidirectional power unit B phase respectively, T12, T22, the non-same polarity of T32 receive the right side output of 1,2, No. 3 bidirectional power unit B phase respectively; T13, T23, the end of the same name of T33 is received the left side output of 1,2, No. 3 bidirectional power unit C phase respectively, T13, T23, the non-same polarity of T33 receive the right side output of 1,2, No. 3 bidirectional power unit C phase respectively; T11-1 of the same name terminates on the A phase terminal of device AC side; T12-1 of the same name terminates on the B phase terminal of device AC side; T13-1 of the same name terminates on the C phase terminal of device AC side; The non-same polarity of T11-1 is received the end of the same name of T21-1; The non-same polarity of T12-1 is received the end of the same name of T22-1; The non-same polarity of T13-1 is received the end of the same name of T23-1; The non-same polarity of T21-1 is received the non-same polarity of T22-2; The non-same polarity of T22-1 is received the non-same polarity of T23-2; The non-same polarity of T23-1 is received the non-same polarity of T21-2; The end of the same name that terminates to T33-1 of the same name of T21-2; The end of the same name that terminates to T31-1 of the same name of T22-2; The end of the same name that terminates to T32-1 of the same name of T23-2; The non-same polarity of T31-1 is received the non-same polarity of T32-2; The non-same polarity of T32-1 is received the non-same polarity of T33-2; The non-same polarity of T33-1 is received the non-same polarity of T31-2; The mid point that terminates to three-phase of the same name of T31-2, T32-2 and T33-2.

The elementary winding of each single-phase transformer and the turn ratio of secondary winding are:

The turn ratio=1:K of T11:T11-1, T12:T12-1 and T13:T13-1 ₁=1:K*cos30 °;

The turn ratio=1:K of T21:T21-1, T22:T22-1 and T23:T23-1 ₂=1:K*cos50 °;

The turn ratio=1:K of T21:T21-2, T22:T22-2 and T23:T23-2 ₃=1:K*cos70 °;

The turn ratio=1:K of T31:T31-1, T32:T32-1 and T33:T33-1 ₃=1:K*cos70 °;

The turn ratio=1:K of T31:T31-2, T32:T32-2 and T33:T33-2 ₂=1:K*cos50 °;

K value in the above-mentioned expression formula determines that according to the dc voltage of the actual output of described DC power supply apparatus and the relativeness of AC side line voltage concrete definite method is:

Wherein, U _AcBe the amplitude of AC side line voltage, U _DcDirect voltage for the device DC side.

Adopt the mode of connection of above-mentioned bidirectional power cellular construction and the tortuous transformer that is connected, the main circuit detailed structure view of described DC power supply apparatus as shown in Figure 4.Transducer Sx1, Sx2, Sx3, Sx4, Sx5, Sx6 (x=1,2,3) in each bidirectional power unit have been omitted among the figure.C among the figure _F1, C _F2, C _F3Be the filter capacitor of device AC side, they form filter circuit, the harmonic wave of filtering device AC side with the synthetic leakage inductance of tortuous each secondary of transformer that is connected.Its concrete connected mode is: C _F1The two ends A mutually and on the B phase terminal that receives device respectively, C _F2The two ends B mutually and on the C phase terminal that receives device respectively, C _F3The two ends A mutually and on the C phase terminal that receives device respectively.

A kind of control method of large power modularized DC power supply apparatus, it is specifically implemented principle and is:

One, the concrete steps of described control method

The control block diagram of described DC power supply apparatus as shown in Figure 5.Controlled quentity controlled variable in the control procedure that each is relevant is controlled by the two-phase DC quantity (d axle, q axle) that the three-phase alternating current amount in the three phase static coordinate system (A, B, C three-phase) is converted in the synchronous rotating frame.In order to realize that the control of device DC side output voltage is provided with outer voltage in the control.Be provided with current inner loop in the control with the response speed of accelerating system and realize control to ac-side current, and each the PI controller in voltage, the electric current loop all adopts the software approach programming to realize, realize the characteristic that anti-integration is saturated simultaneously, improved control performance.

The concrete steps of described control method are:

The 1st step: the set-point of operative installations dc voltage

Voltage U with the device DC side _DcVoltage to the device DC side in outer voltage carries out close loop negative feedback control.The output of PI controller 1 is as the set-point of current inner loop d shaft current (active current) in the outer voltage

And the set-point of q shaft current (reactive current) Constant is 0;

The 2nd step: in control procedure, pass through device AC side voltage u _a, u _bObtain line voltage synchro angle α;

The 3rd step: utilize angle α, adopt method of coordinates transform with the device ac-side current i in the three phase static coordinate system _a, i _bConvert the d shaft current i of the device AC side in the synchronous rotating frame to _dWith q shaft current i _q

The 4th step: PI controller 2 and PI controller 3 use In conjunction with i _d, i _qIn current inner loop, d shaft current and q shaft current are carried out close loop negative feedback control.The output that encircles in the d shaft current in the current inner loop is as the set-point of the d shaft voltage of device output The output of ring is as the set-point of the q shaft voltage of device output in the q shaft current

The 5th step: by Calculate corresponding β ^*(the given angle of device AC side output voltage amplitude is corresponding to device AC side output voltage amplitude set-point) and γ ^*(the given angle of phase place of device AC side output voltage is corresponding to the phase place set-point of device AC side output voltage);

The 6th step: use the phase angle [alpha] of line voltage and the β that combination draws ^*And γ ^*, (G11R G14R), through after the phase shift, produces the phase shift square wave driving signal of 180 ° of each road pulsewidths, change frequency 50Hz, drives the power switch pipe work in each bidirectional power unit for G11L, G14L to produce four tunnel basic drive signals.

Wherein, the concrete implementation step of the driving signal of power switching tube production method in the 6th step is:

1. produce four tunnel basic drive signals (G11L, G14L, the drive signal of G11R and G14R).

180 ° of generation two-way pulsewidths, change frequency 50Hz, phase place are respectively α+γ ^*+ β ^*/ 2 and α+γ ^*-β ^*/ 2 square-wave signal is as the drive signal of G11L and G11R, and the two-way drive signal of G14L and G14R is obtained by the drive signal negate of G11L and G11R respectively.

2. on the basis of four tunnel basic drive signals, carry out phase shift, produce other each road drive signals.

Total drive signal needs 36 the tunnel altogether, poor between the phase place of the drive signal of the phase place of each road drive signal and power switch pipe G11L, and promptly each road drive signal is as shown in table 1 with respect to the phase shifting angle of the drive signal of G11L.β in the table ^*It is the given angle of aforesaid device AC side output voltage amplitude.

G11L	0°	G21L	20°	G31L	40°
						G12L	120°	G22L	140°	G32L	160°
G13L	240°	G23L	260°	G33L	280°
						G14L	180°	G24L	160°	G34L	140°
G15L	60°	G25L	40°	G35L	20°
						G16L	-60°	G26L	-80°	G36L	-100°
G11R	0°-β *	G21R	20°-β *	G31R	40°-β *
						G12R	120°-β *	G22R	140°-β *	G32R	160°-β *
G13R	240°-β *	G23R	260°-β *	G33R	280°-β *
						G14R	180°+β *	G24R	160°+β *	G34R	140°+β *
G15R	60°+β *	G25R	40°+β *	G35R	20°+β *
						G16R	-60°+β *	G26R	-80°+β *	G36R	-100°+β *

Table 1 drive signal phase shifting angle table

According to the phase shifting angle in the table 1, in conjunction with β ^*, just can on the basis of four tunnel basic drive signals, carry out phase shift, produce 36 tunnel whole drive signals.

The device job analysis

Adopt the drive signal of aforesaid bidirectional power cellular construction and each power switch pipe, the expression formula of the each harmonic component of the alternating voltage of each bidirectional power unit output is (is example with No. 1 bidirectional power unit):

$u_{1\mathrm{An}}=\frac{2U_{\mathrm{dc}}}{\mathrm{n\π}}\sin \frac{\mathrm{n\π}}{2}\cos \frac{n{\mathrm{\β}}^{*}}{2}\cos n(\mathrm{\ωt}+\mathrm{\α}+{\mathrm{\γ}}^{*})---\left(1\right)$

$u_{1\mathrm{Bn}}=\frac{2U_{\mathrm{dc}}}{\mathrm{n\π}}\sin \frac{\mathrm{n\π}}{2}\cos \frac{n{\mathrm{\β}}^{*}}{2}\cos n(\mathrm{\ωt}+\mathrm{\α}+{\mathrm{\γ}}^{*}+\frac{2\mathrm{\π}}{3})---\left(2\right)$

$u_{1\mathrm{Cn}}=\frac{2U_{\mathrm{dc}}}{\mathrm{n\π}}\sin \frac{\mathrm{n\π}}{2}\cos \frac{n{\mathrm{\β}}^{*}}{2}\cos n(\mathrm{\ωt}+\mathrm{\α}+{\mathrm{\γ}}^{*}+\frac{4\mathrm{\π}}{3})---\left(3\right)$

Wherein, n is a harmonic number.

The alternating voltage of the turn ratio of the transformer that connects by complications by elementary winding and secondary winding after to these phase shifts carries out amplitude transformation earlier, after in conjunction with the zigzag connection mode they being superposeed then, be (A with device is example mutually) in the expression formula of the each harmonic component of the ac line voltage of the AC side of described device:

$u_{\mathrm{An}}=\frac{2U_{\mathrm{dc}}}{\mathrm{n\π}}\sin \frac{\mathrm{n\π}}{2}\cos \frac{n{\mathrm{\β}}^{*}}{2}[K_1+2K_2\cos \frac{n}{9}\mathrm{\π}+2K_3\cos \frac{2n}{9}\mathrm{\π}]\cos n(\mathrm{\ωt}+\mathrm{\α}+{\mathrm{\γ}}^{*})---\left(4\right)$

$u_{\mathrm{Bn}}=\frac{2U_{\mathrm{dc}}}{\mathrm{n\π}}\sin \frac{\mathrm{n\π}}{2}\cos \frac{n{\mathrm{\β}}^{*}}{2}[K_1+2K_2\cos \frac{n}{9}\mathrm{\π}+2K_3\cos \frac{2n}{9}\mathrm{\π}]\cos n(\mathrm{\ωt}+\mathrm{\α}+{\mathrm{\γ}}^{*}+\frac{2\mathrm{\π}}{3})---\left(5\right)$

$u_{\mathrm{Cn}}=\frac{2U_{\mathrm{dc}}}{\mathrm{n\π}}\sin \frac{\mathrm{n\π}}{2}\cos \frac{n{\mathrm{\β}}^{*}}{2}[K_1+2K_2\cos \frac{n}{9}\mathrm{\π}+2K_3\cos \frac{2n}{9}\mathrm{\π}]\cos n(\mathrm{\ωt}+\mathrm{\α}+{\mathrm{\γ}}^{*}+\frac{4\mathrm{\π}}{3})$

(6)

Wherein, n is a harmonic number, K ₁: K ₂: K ₃=cos30 °: cos50 °: cos70 °

In A, B, the C three-phase, 3 multiple subharmonic can be eliminated in three-wire system naturally, u when n is even number _An, u _Bn, u _CnBe zero.Work as K ₁: K ₂: K ₃=cos30 °: cos50 °: cos70 °, the substitution following formula can obtain, n=5,7,11,13 o'clock u _An, u _Bn, u _CnBe zero.Like this, the minimum harmonic level time is 17 times in the ac line voltage, and the amplitude that harmonic number is lower than each harmonic voltage of 17 times is zero.Each harmonic number is n=18k ± 1 (k=1,2,3 ...), thereby greatly reduce the harmonic content of AC side voltage.

In addition, from formula (4)---(6) as seen, by control β ^*And γ ^*, can control the amplitude and the phase place of described device AC side voltage fundamental independently respectively.According to this characteristic, can be an amplitude and all adjustable variable AC voltage source of phase place with the equivalence of described device, it interacts its equivalent electric circuit and vectogram such as Fig. 6 by the synthetic leakage inductance (also can add filter reactance in addition) and the lead resistance (ignoring among the figure) of tortuous each secondary of transformer that connects with line voltage---and shown in Figure 8.

Please refer to the described DC power supply apparatus equivalent circuit diagram of Fig. 6, during described DC power supply apparatus incoming transport electrical network, comprise device AC side output voltage vector V _i, line voltage vector V _uAnd the equivalent circuit diagram of device ac-side current vector I.X among the figure ₀It is the AC impedance of synthetic leakage inductance correspondence.

Please refer to the described DC power supply apparatus unity power factor of Fig. 7 rectification vectogram, the vectogram when just being in the direct current supply operating mode.As shown in FIG., the electric current of device AC side and the angle of voltage can reach 0 °, thereby power factor is 1.At this moment the flow direction of energy is to be flowed by the AC side of AC network to device, because device is just working in rectification state, can be with the power conversion that is input to its AC side to its DC side, thus at this moment in the system total energy Flow direction be by AC network side direction direct current supply side flow.

Please refer to the described DC power supply apparatus unity power factor of Fig. 8 contravariant vector figure, the vectogram when just being in energy feedback operating mode.As shown in FIG., the electric current of device AC side and the angle of voltage can reach 180 °, thereby power factor is-1.At this moment the flow direction of energy is mobile to AC network by the AC side of device, because device is just working in inverter mode, can be with the power conversion of its DC side to its AC side, thus at this moment in the system total energy Flow direction be by direct current supply side direction AC network side flow.

From the above mentioned, by described control method, High Power Factor work that can implement device, and the energy of device alternating current-direct current both sides can two-way flow, both can work in the direct current supply operating mode, also can work in DC side energy feedback operating mode.

Specific embodiment

The described DC power supply apparatus of present embodiment, direct voltage are 1500V, and alternating voltage is 10KV, power 1600kW.

The described DC power supply apparatus of present embodiment as shown in Figure 1, is characterized in that being made up of with the tortuous transformer that is connected the bidirectional power unit.

Whole main circuit is made up of three bidirectional power unit altogether, and the structure of each bidirectional power unit as shown in Figure 2.Main circuit structure as shown in Figure 4.

Each power switch pipe adopts 1200A, the IPM of the Mitsubishi module of 3300V, model PM1200HCE330 in the described device main circuit.

Each direct current positive bus and direct current negative busbar in the described device main circuit all adopt no inductance bus, to reduce the influence of parasitic parameter to main circuit.

It is 2000V that direct current in the described device in each bidirectional power unit supports capacitor C withstand voltage, and capacity is 20000 μ F, and the electrochemical capacitor connection in series-parallel withstand voltage by a plurality of 400V forms, and model is HCGF5A2G682Y.

AC voltage sensor and direct voltage transducer in each bidirectional power unit all adopt the product of LEM company, and measuring range is the voltage sensor of 100-2500V, and model is: LV100.

DC current sensor in each bidirectional power unit adopts the current sensor of the LEM 1500A of company, and model is: BLFK-S3.

AC current sensor in each bidirectional power unit adopts the current sensor of the LEM 3000A of company, and model is: BLFK-S10.

Relation below the turn ratio of each single-phase transformer primary and secondary winding of transformer that the complications in the described device connect satisfies:

T11：T11-1、T12：T12-1、T13：T13-1：1:4.94；

T21：T21-1、T22：T22-1、T23：T23-1：1:3.66；

T21：T21-2、T22：T22-2、T23：T23-2：1:1.95；

T31：T31-1、T32：T32-1、T33：T33-1：1:1.95；

T31：T31-2、T32：T32-2、T33：T33-2：1:3.66；

Each transformer in the described device all adopts the poured with epoxy resin dry-type transformer, transformer total capacity 1600kVA.

The ac filter condenser capacity of net side is 3.31 μ F in the described device, withstand voltage 12kV, and model is CRBGR12-150-3W.

The control block diagram of device as shown in Figure 5, i wherein _a, i _bBe the two-phase alternating current of device outlet side, u _a, u _bBe the two-phase alternating current net voltage of device outlet side, U _DcBe the device dc voltage.

The concrete control procedure of described device is:

The 1st step: the set-point of operative installations dc voltage

(1500V) with the voltage U of installing DC side _DcVoltage to the device DC side in outer voltage carries out close loop negative feedback control.The output of PI controller 1 is as the set-point of current inner loop d shaft current (active current) in the outer voltage

And the set-point of q shaft current (reactive current)

Constant is 0;

The 2nd step: in control procedure, pass through device AC side voltage u _a, u _bObtain line voltage synchro angle α;

The 3rd step: utilize angle α, adopt method of coordinates transform with the device ac-side current i in the three phase static coordinate system _a, i _bConvert the d shaft current i of the device AC side in the synchronous rotating frame to _dWith q shaft current i _q

The 4th step: PI controller 2 and PI controller 3 use

In conjunction with i _d, i _qIn current inner loop, d shaft current and q shaft current are carried out close loop negative feedback control.The output that encircles in the d shaft current in the current inner loop is as the set-point of the d shaft voltage of device output

The output of ring is as the set-point of the q shaft voltage of device output in the q shaft current

The 5th step: by

Calculate corresponding β ^*(the given angle of device AC side output voltage amplitude is corresponding to device AC side output voltage amplitude set-point) and γ ^*(the given angle of phase place of device AC side output voltage is corresponding to the phase place set-point of device AC side output voltage);

The 6th step: use the phase angle [alpha] of line voltage and the β that combination draws ^*And γ ^*, produce basic 4 the tunnel (G11L, G14L, G11R, G14R) 180 °, 50Hz square wave driving signal, be superimposed with corresponding phase shifting angle after, produce the square wave driving signal of 180 ° of totally 36 tunnel pulsewidths, change frequency 50Hz, drive each power switch pipe work.

The phase shifting angle of the drive signal of each power switch pipe is as shown in table 1 in the 6th step.

The above only is one embodiment of the present of invention, can not with qualification practical range of the present invention, so the displacement of similar assembly, and the basic principle control method identical with control method of the present invention all belongs to this patent protection range.

Claims (4)

1, a kind of large power modularized DC power supply apparatus is characterized in that: large power modularized DC power supply apparatus is made up of with the tortuous transformer that is connected the bidirectional power unit,

The bidirectional power unit is constructed as follows: three bidirectional power unit are arranged in the device, the DC side parallel of each bidirectional power unit, each bidirectional power unit concrete connecting and composing of each device is: the contrary guiding shape tube Gx1L of 12 inverse parallel diodes, Gx2L, Gx3L, Gx4L, Gx5L, Gx6L, Gx1R, Gx2R, Gx3R, Gx4R, Gx5R, Gx6R, wherein Gx1L and Gx4L, Gx2L and Gx5L, Gx3L and Gx6L, Gx1R and Gx4R, Gx2R and Gx5R, Gx3R and Gx6R series connection form six brachium pontis, brachium pontis just, negative two ends are parallel to respectively together, the positive termination of brachium pontis is used to measure the right-hand member of average anode current Sx2, after being connected together, the negative terminal of brachium pontis meets the direct current negative busbar N of bidirectional power unit, the left end of Sx2 meets the direct current positive bus P of bidirectional power unit, the last termination P of direct voltage transducer Sx1, following termination N, C _DxPositive pole receive the right-hand member of Sx2, negative pole is received on the N.Each bidirectional power unit has also inserted wherein three elementary winding Tx1 of the transformer of tortuous connection, Tx2, Tx3, wherein the tie point of Gx1L and Gx4L is received the left end of Sx3, the right-hand member of Sx3 is received the end of the same name of Tx1, the non-same polarity of Tx1 is received the tie point of Gx1R and Gx4R, Gx2L and Gx5L tie point are received the left end of Sx4, the right-hand member of Sx4 is received the end of the same name of Tx2, the non-same polarity of Tx2 is received the tie point of Gx2R and Gx5R, the tie point of Gx3L and Gx6L is received the end of the same name of Tx3, the non-same polarity of Tx3 is received the tie point of Gx3R and Gx6R, terminate to the left end of Sx3 on the measurement two-phase alternating current pressure Sx5, the following left end that terminates to Sx4 of Sx5, terminate to the left end of Sx4 on the measurement two-phase alternating current pressure Sx6, the following end of the same name that terminates to Tx3 of Sx6;

The tortuous transformer that connects is formed as follows: the elementary winding of each single-phase transformer is: the elementary winding that connects three single-phase transformers of No. 1 bidirectional power unit is T11, T12, T13, the elementary winding that connects three single-phase transformers of No. 2 bidirectional power unit is T21, T22, T23, the elementary winding that connects three single-phase transformers of No. 3 bidirectional power unit is T31, T32, T33, has nine elementary windings;

The secondary winding of each single-phase transformer is: three single-phase transformers that connect No. 1 bidirectional power unit respectively have secondary winding T11-1, a T12-1, T13-1, three single-phase transformers that connect No. 2 bidirectional power unit respectively have two secondary winding T21-1, T21-2, T22-1, T22-2, T23-1, T23-2, three single-phase transformers that connect No. 3 bidirectional power unit respectively have two secondary winding T31-1, T31-2, T32-1, T32-2, T33-1, T33-2, totally ten five secondary winding;

T11-1 of the same name terminates on the A phase terminal of device AC side, the non-same polarity of T11-1 is received the end of the same name of T21-1, the non-same polarity of T21-1 is received the non-same polarity of T22-2, the end of the same name that terminates to T31-1 of the same name of T22-2, the non-same polarity of T31-1 is received the non-same polarity of T32-2, the mid point of the termination three-phase of the same name of T32-2;

T12-1 of the same name terminates on the B phase terminal of device AC side, the non-same polarity of T12-1 connects the end of the same name of T22-1, the non-same polarity of T22-1 connects the non-same polarity of T23-2, the end of the same name of the termination T32-1 of the same name of T23-2, the non-same polarity of T32-1 connects the non-same polarity of T33-2, the mid point of the termination three-phase of the same name of T33-2;

T13-1 of the same name terminates on the C phase terminal of device AC side, the non-same polarity of T13-1 connects the end of the same name of T23-1, the non-same polarity of T23-1 connects the non-same polarity of T21-2, the end of the same name of the termination T33-1 of the same name of T21-2, the non-same polarity of T33-1 connects the non-same polarity of T31-2, the mid point of the termination three-phase of the same name of T31-2;

The elementary winding of each single-phase transformer and the turn ratio of secondary winding are:

The turn ratio=1:K of T11:T11-1, T12:T12-1 and T13:T13-1 ₁=1:K*cos30 °;

The turn ratio=1:K of T21:T21-1, T22:T22-1 and T23:T23-1 ₂=1:K*cos50 °;

The turn ratio=1:K of T21:T21-2, T22:T22-2 and T23:T23-2 ₃=1:K*cos70 °;

The turn ratio=1:K of T31:T31-1, T32:T32-1 and T33:T33-1 ₃=1:K*cos70 °;

The turn ratio=1:K of T31:T31-2, T32:T32-2 and T33:T33-2 ₂=1:K*cos50 °;

K value in the above-mentioned expression formula determines that according to the dc voltage of the actual output of described DC power supply apparatus and the relativeness of AC side line voltage concrete definite method is:

Wherein, U _AcBe the amplitude of AC side electrical network electricity, U _DcDirect voltage for the device DC side.

2, a kind of large power modularized DC power supply apparatus as claimed in claim 1 is characterized in that: filter capacitor C _F1The two ends A mutually and on the B phase terminal that receives device respectively, filter capacitor C _F2The two ends B mutually and on the C phase terminal that receives device respectively, filter capacitor C _F3The two ends A mutually and on the C phase terminal that receives device respectively.

3, a kind of large power modularized DC power supply apparatus as claimed in claim 1 or 2 is characterized in that: contrary guiding shape tube has adopted the Intelligent Power Module IPM of current detection circuit inner integrated, can save AC current sensor.

4, a kind of control method of large power modularized DC power supply apparatus is characterized in that:

The concrete steps of described control method are:

The 1st step: the set-point of operative installations dc voltage

Voltage U with the device DC side _DcVoltage to the device DC side in outer voltage carries out close loop negative feedback control.The output of PI controller 1 is as the set-point of current inner loop d shaft current (active current) in the outer voltage , and the set-point of q shaft current (reactive current)

Constant is 0;

The 2nd step: in control procedure, pass through device AC side voltage u _a, u _bObtain line voltage synchro angle α;

The 3rd step: utilize angle α, adopt method of coordinates transform with the device ac-side current i in the three phase static coordinate system _a, i _bConvert the d shaft current i of the device AC side in the synchronous rotating frame to _dWith q shaft current i _q

The 4th step: PI controller 2 and PI controller 3 use ,

, in conjunction with i _d, i _qIn current inner loop, d shaft current and q shaft current are carried out close loop negative feedback control.The output that encircles in the d shaft current in the current inner loop is as the set-point of the d shaft voltage of device output

, the output of ring is as the set-point of the q shaft voltage of device output in the q shaft current

The 5th step: by

, Calculate corresponding β ^*(the given angle of device AC side output voltage amplitude is corresponding to device AC side output voltage amplitude set-point) and γ ^*(the given angle of phase place of device AC side output voltage is corresponding to the phase place set-point of device AC side output voltage);

The 6th step: use the phase angle [alpha] of line voltage and the β that combination draws ^*And γ ^*, (G11R G14R), through after the phase shift, produces the phase shift square wave driving signal of 180 ° of each road pulsewidths, change frequency 50Hz, drives the power switch pipe work in each bidirectional power unit for G11L, G14L to produce four tunnel basic drive signals.

Wherein, the concrete implementation step of the driving signal of power switching tube production method in the 6th step is:

1. produce four tunnel basic drive signals (G11L, G14L, the drive signal of G11R and G14R).

180 ° of generation two-way pulsewidths, change frequency 50Hz, phase place are respectively α+γ ^*+ β ^*/ 2 and α+γ ^*-β ^*/ 2 square-wave signal is as the drive signal of G11L and G11R, and the two-way drive signal of G14L and G14R is obtained by the drive signal negate of G11L and G11R respectively.

2. on the basis of four tunnel basic drive signals, carry out phase shift, produce other each road drive signals.

Total drive signal needs 36 the tunnel altogether, poor between the phase place of the drive signal of the phase place of each road drive signal and power switch pipe G11L, and promptly each road drive signal is as shown in table 1 with respect to the phase shifting angle of the drive signal of G11L.β in the table ^*It is the given angle of aforesaid device AC side output voltage amplitude.

G11L 0° G21L 20° G31L 40° G12L 120° G22L 140° G32L 160° G13L 240° G23L 260° G33L 280° G14L 180° G24L 160° G34L 140° G15L 60° G25L 40° G35L 20° G16L -60° G26L -80° G36L -100° G11R 0°-β ^* G21R 20°-β ^* G31R 40°-β ^* G12R 120°-β ^* G22R 140°-β ^* G32R 160°-β ^* G13R 240°-β ^* G23R 260°-β ^* G33R 280°-β ^* G14R 180°+β ^* G24R 160°+β ^* G34R 140°+β ^* G15R 60°+β ^* G25R 40°+β ^* G35R 20°+β ^* G16R -60°+β ^* G26R -80°+β ^* G36R -100°+β ^*

Table 1 drive signal phase shifting angle table

According to the phase shifting angle in the table 1, in conjunction with β ^*, just can on the basis of four tunnel basic drive signals, carry out phase shift, produce 36 tunnel whole drive signals.

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