CN102394557A - Hybrid parallel type high-voltage direct current traction power supply current transformer and control method thereof - Google Patents
Hybrid parallel type high-voltage direct current traction power supply current transformer and control method thereof Download PDFInfo
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Abstract
The invention relates to a hybrid parallel type high-voltage direct current traction power supply current transformer and a control method thereof. The hybrid parallel type high-voltage direct current traction power supply current transformer is characterized by comprising a set of pulse width modulation (PWM) rectifier units and a set of diode rectifier units, wherein both an input end of the PWM rectifier units and an input end of the diode rectifier units are connected with an alternating current electric network, and an output end of the PWM rectifier units and an output end of the diode rectifier units are connected in parallel to realize high-voltage direct current output. Because the PWM rectifier units and the diode rectifier units are connected in series, the direct current output voltage of the entire current transformer is improved, the power supply distance is prolonged, and the contact net loss is reduced. Meanwhile, equipment investment is reduced, and the reliability of a system is improved. The hybrid parallel type high-voltage direct current traction power supply current transformer and the control method thereof can be widely applied to urban railway transit traction power supply systems.
Description
Technical field
The present invention relates to a kind of HVDC traction power supply convertor assembly and control method, particularly about a kind of mixing parallel connection type HVDC traction power supply convertor assembly and control method thereof that is used to the urban rail transit vehicles power supply.
Background technology
At present, what urban rail transit in China traction power supply convertor assembly still adopted is diode rectifier, and supply power voltage is 750V or 1500V.This supply power mode has been continued to use many decades; Its great advantage is that apparatus structure is simple, also comparative maturity of technology; But also there are following problems in this traditional power supply plan: 1, owing to adopt diode rectifier, energy can only one-way flow, so the energy that produces of car brakeing can not feedback grid; Usually adopt resistance consumption to fall, cause the waste greatly of energy.2, VD is uncontrollable, and fluctuation range is big, is unfavorable for the safe and reliable economical operation of vehicle.3, the pressure drop of contact line net is big, and the supply station distance between sites is short, is no more than 3～4 kilometers usually, causes that required supply station quantity is more, construction investment is big.
Advantages such as PWM (pulse width modulation) rectifier has the energy two-way flow, and power factor is high, and VD is controlled.The PWM rectifier is applied in the urban track traffic tractive power supply system, not only can realizes the feedback of train braking energy, saves energy, and keep dc voltage stability; If can improve direct current supply simultaneously brings up to more than the 1.5kV; Can also prolong power supply distance; Reduce supply station quantity, reduce the contact line loss, have very big actual application value; But with respect to the conventional diode rectifier, the PWM rectifier all is being in a disadvantageous position aspect price, reliability, maintenance, the overload capacity.In fact, for the urban track traffic tractive power supply system, required traction capacity is generally more than 2 times of braking capacity, therefore considers from economy, and is also uneconomical based on the power supply plan of full PWM rectifier.
Summary of the invention
To the problems referred to above; The purpose of this invention is to provide and a kind ofly can improve direct-current traction power supply voltage; Prolong power supply distance, reduce supply station quantity; Reduce the contact line loss, when the feedback that realizes the train braking energy utilizes, improve the mixing parallel connection type HVDC traction power supply convertor assembly and the control method thereof of system reliability again.
For realizing above-mentioned purpose; The present invention takes following technical scheme: a kind of mixing parallel connection type HVDC traction power supply convertor assembly; It is characterized in that: it comprises a cover PWM Rectification Power Factor and a cover diode rectification unit; The input of the input of said PWM Rectification Power Factor and diode rectification unit all is connected AC network, after the output parallel connection of the output of said PWM Rectification Power Factor and diode rectification unit, realizes HVDC output.
Said PWM Rectification Power Factor comprises a multi winding transformer, several PWM rectifier units and several control units; Said multi winding transformer is made up of a former limit winding and a plurality of secondary winding, and the number of said PWM rectifier unit is corresponding setting with the said multi winding transformer secondary number of windings; The former limit of said multi winding transformer winding connects said AC network; Each secondary winding connects a said PWM rectifier unit; Each said PWM rectifier unit dc output end is in sequential series; And each said PWM rectifier unit all connects a said control unit, and said control unit is controlled the work of said PWM rectifier unit.
Each said control unit constitutes by four data collecting units, a current loop control unit, a phase locking unit, a Voltage loop control unit and a pulse generation unit; The said PWM rectifier unit two-phase alternating current that first said data acquisition unit will collect transfers to said current loop control unit; The former limit winding voltage of the said multi winding transformer that second said data acquisition unit will collect transfers to said current loop control unit through said phase locking unit, and the direct voltage and the direct current of the said PWM rectifier unit that the 3rd, the 4th said data acquisition unit will collect respectively transfer to said Voltage loop control unit; Said Voltage loop control unit deducts the direct-flow no load voltage set-point behind the product of direct current and sagging slope and carries out the PI computing, and the current value that obtains is imported in the said current loop control unit; Transfer to after each road voltage, current signal in the said current loop control unit carry out coordinate transform and PI calculation process, through said pulse generation unit convert to drive fluctuating signal after, be back to said PWM rectifier unit and realize its control.
Said PWM rectifier unit comprises that power device and direct current support electric capacity, and said PWM rectifier unit adopts two level or three level Three-phase PWM Voltage Rectifier main circuits.
Said power device adopts the IGBT power model, and said direct current supports electric capacity and adopts metallic film electric capacity.
Said diode rectification unit comprises a phase shifting transformer and several diode rectifier unit; Said phase shifting transformer is made up of a former limit winding and a plurality of secondary winding, and the number of said diode rectifier unit is corresponding setting with the secondary number of windings of said phase shifting transformer; The former limit of said phase shifting transformer winding connects said AC network, and each secondary winding connects a said diode rectifier unit, and each said diode rectifier unit dc output end is in sequential series.
Each secondary winding of said phase shifting transformer all adopts the extend-triangle connected mode.
Realize the control method of above-mentioned mixing parallel connection type HVDC traction power supply convertor assembly; It comprises the steps: that (1) at first carry out Voltage loop control at the Voltage loop control unit, by the 4th and the 3rd the data collecting unit direct current I with the PWM rectifier unit that collects respectively
DcWith direct voltage U
DcAll input to the Voltage loop control unit, direct current I
DcWith predefined sagging slope K
DpBack and direct-flow no load voltage set-point U multiply each other
kAfter subtracting each other, with direct voltage U
DcSubtract each other and carry out the PI computing, obtain the d axle active current set-point of current loop control unit
(2) second data collecting units are gathered the two-phase alternating current net voltage u of the former limit of multi winding transformer winding voltage instrument transformer output
aAnd u
b, and advance horizontal lock by phase locking unit, obtain line voltage synchro angle θ; (3) first data acquisition unit is with the two-phase alternating current i of the PWM rectifier unit that collects
aAnd i
bIn the input current ring control unit, it is transformed under the synchronous rotating frame obtains i
dAnd i
q(4) with the d that obtains under the synchronous rotating frame, q shaft current i
dAnd i
qRespectively with the electric current set-point
With
Subtract each other, and its difference is carried out the PI computing respectively, obtain pwm voltage U under the synchronous rotating frame
d, U
q(5) with the synchronous rotating frame voltage U
d, U
qBe transformed into input pulse generation unit after the rest frame, and adopt the 3 level space vector pulse width modulation algorithm to produce the pwm pulse signal of each IGBT switching tube, realize control the PWM rectifier unit.
Each said PWM rectifier unit all adopts based on the sagging control method of the external characteristic of load-current feedforward.
The present invention is owing to take above technical scheme, and it has the following advantages: 1, the present invention has improved whole convertor assembly VD owing to adopt PWM rectifier unit and diode rectifier units in series, prolongs power supply distance, reduces the contact line loss.2, the present invention is based on the mixed structure of PWM Rectification Power Factor and diode rectification unit, make full use of the advantage of the two, when the feedback that realizes the train braking energy utilizes, reduced equipment investment as much as possible again, improved the reliability of system.3, the present invention is owing to each secondary winding of phase shifting transformer in the diode rectification unit all adopts the extend-triangle connected mode; Make that like this each secondary winding output voltage phase place mutual deviation is the 60/n electrical degree; And then the formation multi-pulse rectification, reduced whole diode rectification unit VD ripple and alternating current harmonic wave.4, the present invention is through to each PWM rectifier unit direct current output characteristic control, guaranteed that each PWM unit DC series all presses, and the load allocating between PWM Rectification Power Factor and the diode rectification unit.The present invention can be widely used in the urban track traffic tractive power supply system.
Description of drawings
Fig. 1 is an overall structure sketch map of the present invention;
Fig. 2 is a PWM rectifier unit control principle sketch map of the present invention;
Fig. 3 is a diode rectification set structure sketch map in the 9kY mixing parallel connection type HVDC traction power supply convertor assembly of the present invention;
Fig. 4 is a PWM Rectification Power Factor structural representation in the 9kY mixing parallel connection type HVDC traction power supply convertor assembly of the present invention;
Fig. 5 is a three-level PWM rectifier of the present invention unit main circuit topology;
Fig. 6 is the droop characteristic sketch map of the present invention's mixing parallel connection type HVDC traction power supply unsteady flow control method.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
As shown in Figure 1; Mixing parallel connection type HVDC traction power supply convertor assembly of the present invention comprises cover PWM (pulse width modulation) Rectification Power Factor 10 and a cover diode rectification unit 20; The input of the input of PWM Rectification Power Factor 10 and diode rectification unit 20 all is connected AC network of the prior art; After the output parallel connection of the output of PWM Rectification Power Factor 10 and diode rectification unit 20; As the output of the present invention's mixing parallel connection type HVDC traction power supply convertor assembly, realize HVDC output.
Wherein, PWM Rectification Power Factor 10 comprises a multi winding transformer 11, several PWM rectifier units 12 and several control units 13; Multi winding transformer 11 is made up of a former limit winding and a plurality of secondary winding, and the number of PWM rectifier unit 12 is corresponding setting with the multi winding transformer 11 secondary numbers of windings.Multi winding transformer 11 former limit windings connect AC network, and each secondary winding connects a PWM rectifier unit 12, and each PWM rectifier unit 12 dc output end is in sequential series, to realize HVDC output.And each PWM rectifier unit 12 all connects a control unit 13, by the work of control unit 13 control PWM rectifier units 12.
Diode rectification unit 20 comprises a phase shifting transformer 21 and several diode rectifier unit 22; Phase shifting transformer 21 is made up of a former limit winding and a plurality of secondary winding, and the number of diode rectifier unit 22 is corresponding setting with the secondary number of windings of phase shifting transformer 21.Phase shifting transformer 21 former limit windings connect AC network, and each secondary winding connects a diode rectifier unit 22, and each diode rectifier unit 22 dc output end is also in sequential series, realize high pressure output.
In the foregoing description, each secondary winding connection of multi winding transformer 11 is identical in the PWM Rectification Power Factor 10, and each secondary short circuit in winding impedance is used for substituting PWM rectifier unit 12 AC side inductance, thus simplied system structure.
Among above-mentioned each embodiment; PWM rectifier unit 12 comprises that power device and direct current support electric capacity; It can adopt two level or three level Three-phase PWM Voltage Rectifier main circuits, and power device adopts the IGBT power model, and direct current supports electric capacity and adopts metallic film electric capacity.
Among above-mentioned each embodiment, each control unit 13 constitutes by four data collecting units 14, current loop control unit 15, phase locking unit 16, a Voltage loop control unit 17 and a pulse generation unit 18.Wherein, first data acquisition unit 14 transfers to PWM rectifier unit 12 two-phase alternating currents that collect in the current loop control unit 15; Second data collecting unit 14 with the former limit winding voltage of the multi winding transformer that collects 11 in phase locking unit 16 transfers to current loop control unit 15; The 3rd, the 4th data collecting unit 14 is respectively with the direct voltage U of the PWM rectifier unit 12 that collects
DcWith direct current I
DcTransfer in the Voltage loop control unit 17.Voltage loop control unit 17 is with direct-flow no load voltage set-point U
kDeduct direct current I
DcWith sagging slope K
DpProduct after, with the direct voltage U that receives
DcSubtract each other and carry out PI computing (proportional integral computing), in the current value input current ring control unit 15 that obtains.Transfer to after each road voltage, current signals in the current loop control unit 15 carry out coordinate transform and PI calculation process, through pulse generation unit 18 convert to drive fluctuating signal after, be back to PWM rectifier unit 12, realize control to PWM rectifier unit 12.
Among above-mentioned each embodiment; Each secondary winding of phase shifting transformer 21 all adopts the extend-triangle connected mode in the diode rectification unit 20; Make that each secondary winding output voltage phase place mutual deviation is the 60/n electrical degree; And then the formation multi-pulse rectification, reduce mixing parallel connection type HVDC traction power supply convertor assembly VD ripple of the present invention and alternating current harmonic wave.
As shown in Figure 2; Each PWM rectifier unit 12 in the present invention's mixing parallel connection type HVDC traction power supply convertor assembly all adopts based on the sagging control method of the external characteristic of load-current feedforward; Guarantee each PWM rectifier unit 12 series average-voltage, and the load allocating between PWM Rectification Power Factor 10 and the diode rectification unit 20.Mixing parallel connection type HVDC traction power supply unsteady flow control method then of the present invention comprises the steps:
1) at first carries out Voltage loop control, by the 4th and the 3rd data collecting unit 14 direct current I with the PWM rectifier unit 12 that collects respectively at Voltage loop control unit 17
DcWith direct voltage U
DcAll input to Voltage loop control unit 17, direct current I
DcWith predefined sagging slope K
DpBack and direct-flow no load voltage set-point U multiply each other
kSubtract each other, its difference is as direct voltage closed loop set-point
Direct voltage closed loop set-point
With direct voltage U
DcSubtract each other, difference is carried out the PI computing, obtains the d axle active current set-point of current loop control unit 15 at last
2) the two-phase alternating current net voltage u of multi winding transformer 11 former limit winding voltage instrument transformer outputs is gathered in lock phase computing by second data collecting unit 14
aAnd u
b, and advance horizontal lock by phase locking unit 16, obtain line voltage synchro angle θ;
3) coordinate transform is by the two-phase alternating current i of first data acquisition unit 14 with the PWM rectifier unit 12 that collects
aAnd i
bIn the input current ring control unit 15, it is transformed under the synchronous rotating frame obtains i
dAnd i
q
4) with the d that obtains under the synchronous rotating frame, q shaft current i
dAnd i
qRespectively with the electric current set-point
With
Subtract each other and (, all make i usually for the guaranteed output factor is 1
qThe electric current set-point
), and its difference carried out the PI computing respectively, obtain pwm voltage U under the synchronous rotating frame
d, U
q
5) with the synchronous rotating frame voltage U
d, U
qBe transformed into input pulse generation unit 18 after the rest frame, and adopt three level SVPWMs (space vector pulse width modulation) modulation algorithm to produce the pwm pulse signal of each IGBT switching tube, realize control PWM rectifier unit 12.
In the foregoing description, based on the sagging control of the external characteristic of load-current feedforward, Voltage loop control unit 17 adopts astatic pi regulator, but the set-point of Voltage loop reduces along with the increase of output current.
Through an embodiment the present invention is done further introduction below.
Embodiment: as shown in Figure 3, the rated capacity of diode rectification unit 20 is 6MW, and wherein: phase shifting transformer 21 adopts the poured with epoxy resin dry-type transformer; Capacity is 6MVA, has a former limit winding, three secondary windings; No-load voltage ratio is 35kV/2.4kV/2.4kV/2.4kV, and former limit winding adopts △ to connect, and the secondary winding adopts extend-triangle to connect; Make each secondary winding output voltage phase place be respectively+20 °; 0 ° ,-20 °, thus make whole diode rectification unit 20 constitute 18 pulse wave rectifiers.The capacity of each diode rectifier unit 22 is 2MW, and specified VD is 3kV, and wherein, diode all adopts round pie 6kV high-voltage diode.The AC side of each diode rectifier unit 22 links to each other with a secondary winding of phase shifting transformer 21 respectively, DC side connection in sequential series.
As shown in Figure 4, the capacity of PWM Rectification Power Factor 10 also is 6MW, and wherein: multi winding transformer 11 also adopts the poured with epoxy resin dry-type transformer; Have a former limit winding, three secondary windings, the connected mode of multi winding transformer 11 is Yd11; D11; The d11 no-load voltage ratio is 35kV/1.8kV/1.8kV/1.8kV, and capacity is 6MVA, secondary winding equivalent short circuit impedance 30%.The capacity of PWM rectifier unit 12 is 3MW, and the direct current output rated voltage is 3kV.Each PWM rectifier unit 12 AC side links to each other with a secondary winding of multi winding transformer 11 respectively, DC side connection in sequential series.
Bear voltage for reducing power device, increase power system capacity simultaneously, each PWM rectifier unit 12 adopts mid point clamping type three level main circuit topologies (as shown in Figure 5).Wherein, power device adopts the IGBT of 3300V electric pressure, and switching frequency is got 1kHz, and direct current supports electric capacity and adopts metallic film electric capacity, and stray inductance is little, and the ripple current handling capacity is strong, and the life-span is long, helps reducing equipment maintenance cost.
The control method of each PWM rectifier unit 12 adopts based on the sagging control of the external characteristic of load-current feedforward, guarantees each PWM rectifier unit 12 series average-voltage, and the load allocating between PWM Rectification Power Factor 10 and the diode rectification unit 20.
As shown in Figure 6, be PWM rectifier unit 12 typical droop characteristics, kdp is sagging slope, gets k in the present embodiment
Dp=0.15.This sagging control method of outer spy based on load-current feedforward; The direct current pressure ring still adopts astatic pi regulator, and just the set-point of Voltage loop reduces along with the increase of output current, and the output of Voltage loop is as d axle active current set-point; Q axle reactive current set-point is set to zero; Carry out closed-loop control to meritorious with reactive current respectively then, the closed-loop control output valve is used for the SVPWM modulation, finally produces driving pulse.
Above-mentioned each embodiment only is used to explain the present invention; The structure of each parts and connected mode all can change to some extent; On the basis of technical scheme of the present invention; All improvement and equivalents of the connection and the structure of individual component being carried out according to the principle of the invention all should not got rid of outside protection scope of the present invention.
Claims (9)
1. one kind is mixed parallel connection type HVDC traction power supply convertor assembly; It is characterized in that: it comprises a cover PWM Rectification Power Factor and a cover diode rectification unit; The input of the input of said PWM Rectification Power Factor and diode rectification unit all is connected AC network; After the output parallel connection of the output of said PWM Rectification Power Factor and diode rectification unit, realize HVDC output.
2. a kind of mixing parallel connection type HVDC traction power supply convertor assembly as claimed in claim 1; It is characterized in that: said PWM Rectification Power Factor comprises a multi winding transformer, several PWM rectifier units and several control units; Said multi winding transformer is made up of a former limit winding and a plurality of secondary winding, and the number of said PWM rectifier unit is corresponding setting with the said multi winding transformer secondary number of windings; The former limit of said multi winding transformer winding connects said AC network; Each secondary winding connects a said PWM rectifier unit; Each said PWM rectifier unit dc output end is in sequential series; And each said PWM rectifier unit all connects a said control unit, and said control unit is controlled the work of said PWM rectifier unit.
3. a kind of mixing parallel connection type HVDC traction power supply convertor assembly as claimed in claim 2 is characterized in that: each said control unit constitutes by four data collecting units, a current loop control unit, a phase locking unit, a Voltage loop control unit and a pulse generation unit; The said PWM rectifier unit two-phase alternating current that first said data acquisition unit will collect transfers to said current loop control unit; The former limit winding voltage of the said multi winding transformer that second said data acquisition unit will collect transfers to said current loop control unit through said phase locking unit, and the direct voltage and the direct current of the said PWM rectifier unit that the 3rd, the 4th said data acquisition unit will collect respectively transfer to said Voltage loop control unit; Said Voltage loop control unit deducts the direct-flow no load voltage set-point behind the product of direct current and sagging slope and carries out the PI computing, and the current value that obtains is imported in the said current loop control unit; Transfer to after each road voltage, current signal in the said current loop control unit carry out coordinate transform and PI calculation process, through said pulse generation unit convert to drive fluctuating signal after, be back to said PWM rectifier unit and realize its control.
4. like claim 2 or 3 described a kind of mixing parallel connection type HVDC traction power supply convertor assemblys; It is characterized in that: said PWM rectifier unit comprises that power device and direct current support electric capacity, and said PWM rectifier unit adopts two level or three level Three-phase PWM Voltage Rectifier main circuits.
5. a kind of mixing parallel connection type HVDC traction power supply convertor assembly as claimed in claim 4 is characterized in that: said power device adopts the IGBT power model, and said direct current supports electric capacity and adopts metallic film electric capacity.
6. like any described a kind of mixing parallel connection type HVDC traction power supply convertor assembly of claim 1～5; It is characterized in that: said diode rectification unit comprises a phase shifting transformer and several diode rectifier unit; Said phase shifting transformer is made up of a former limit winding and a plurality of secondary winding, and the number of said diode rectifier unit is corresponding setting with the secondary number of windings of said phase shifting transformer; The former limit of said phase shifting transformer winding connects said AC network, and each secondary winding connects a said diode rectifier unit, and each said diode rectifier unit dc output end is in sequential series.
7. a kind of mixing parallel connection type HVDC traction power supply convertor assembly as claimed in claim 6, it is characterized in that: each secondary winding of said phase shifting transformer all adopts the extend-triangle connected mode.
8. realize the control method like any said mixing parallel connection type HVDC traction power supply convertor assembly of claim 1～7, it comprises the steps:
(1) at first carries out Voltage loop control, by the 4th and the 3rd data collecting unit direct current I with the PWM rectifier unit that collects respectively at the Voltage loop control unit
DcWith direct voltage U
DcAll input to the Voltage loop control unit, direct current I
DcWith predefined sagging slope K
DpBack and direct-flow no load voltage set-point U multiply each other
kAfter subtracting each other, with direct voltage U
DcSubtract each other and carry out the PI computing, obtain the d axle active current set-point of current loop control unit
(2) second data collecting units are gathered the two-phase alternating current net voltage u of the former limit of multi winding transformer winding voltage instrument transformer output
aAnd u
b, and advance horizontal lock by phase locking unit, obtain line voltage synchro angle θ;
(3) first data acquisition unit is with the two-phase alternating current i of the PWM rectifier unit that collects
aAnd i
bIn the input current ring control unit, it is transformed under the synchronous rotating frame obtains i
dAnd i
q
(4) with the d that obtains under the synchronous rotating frame, q shaft current i
dAnd i
qRespectively with the electric current set-point
With
Subtract each other, and its difference is carried out the PI computing respectively, obtain pwm voltage U under the synchronous rotating frame
d, U
q
(5) with the synchronous rotating frame voltage U
d, U
qBe transformed into input pulse generation unit after the rest frame, and adopt the 3 level space vector pulse width modulation algorithm to produce the pwm pulse signal of each IGBT switching tube, realize control the PWM rectifier unit.
9. a kind of mixing parallel connection type HVDC traction power supply unsteady flow control method as claimed in claim 8, it is characterized in that: each said PWM rectifier unit all adopts based on the sagging control method of the external characteristic of load-current feedforward.
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