CN204836014U - A tandem type interchange exciting arrangement for variable -ratio water -storage power generation system - Google Patents
A tandem type interchange exciting arrangement for variable -ratio water -storage power generation system Download PDFInfo
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Abstract
The utility model relates to a water -storage power generation sector, in particular to a tandem type interchange exciting arrangement for variable -ratio water -storage power generation system, including rotor side switch module, multi -winding transformer module and the three -phase tandem type H bridge module back -to -back that is incorporated into the power networks, rotor side is incorporated into the power networks the switch module and links to each other with the multi -winding transformer module, H bridge module is continuous back -to -back with the three -phase tandem type for the multi -winding transformer module. The utility model discloses the advantage lies in having frequency conversion serviceability, can satisfy the excitation requirement of water -storage generator operation variable speed operation, have two -way energy flow ability, can satisfy the excitation requirement of water -storage generating set in generating operation mode and the operation of electronic operating mode simultaneously.
Description
Technical field
The utility model relates to pumped-storage power generation field, particularly a kind of tandem type AC excitation device for variable-ratio pumped storage system.
Background technology
Hydroenergy storage station has and starts feature that is fast, flexible operation, can bear tasks such as filling out paddy, peak regulation, frequency modulation, phase modulation and emergency use in systems in which.Traditional electric-generating unit adopts the conventional synchronization generator of DC excitation, and contrast of regulating speed is difficult and operation characteristic is poor, and when this kind of unit does motoring condition operation in addition, actuating ratio is more difficult.And the ac excited generator adopting AC excitation device to power replaces traditional electric-generating unit, the problems such as the variable-speed operation of speed governing existing for traditional pump-storage generator or hydraulic generator effectively can be solved.
Run on the ac excited generator rotor-side rated voltage of variable-ratio pump-up power station generally about several kilovolts grades, the grid-connected end of AC excitation device generally accesses stator terminal by step-down transformer, and step-down transformer secondary voltage is general also close to ac excited generator rotor-side grade of rated voltage.At present, domestic and international many companies all release respective AC excitation device, and these products adopt different rectifiers and inverter and form different Topology Structure Designs and control program.More typically adopt the high pressure full-controlled switch devices such as IGCT and IEGT, although the consumption of device can be reduced, cost intensive, and device is limited by minority foreign enterprise, the expansion of electric pressure is also limited.
Cascaded H-bridges topologies can meet the application demand of high pressure occasion with traditional low tension switch device, be widely used in high voltage synchronous machine or squirrel cage induction motors frequency conversion debugging occasion at present.This application scenario General Requirements energy one-way flow, namely realizes motor drag, can not realize the feedback of energy, thus determines the topological structure of current cascaded H-bridges topology at grid-connected end many employings uncontrollable rectifier.And to the AC excitation device that ac excited generator is powered, necessarily require the two-way flow of energy, therefore need to propose new cascaded H-bridges topological structure and control strategy, to meet the excitation demand of ac excited generator.
Existing Patents has number of patent application to be: CN201410471319.2, the applying date is: 2014-9-16, name is called the patent of invention of " topological structure of generator three-phase AC excitation system and device ", and number of patent application is CN201410472111.2, the applying date is: 2006-10-26, the patent of invention that name is called " topological structure of three grades of formula started with no brush/generator AC and DC composite excitation systems and device ".
Although above-mentioned patent is a kind of AC excitation device viewed from grid side, they are all for traditional rotor DC excitation Synchronous generator.Although have employed exciter and pilot exciter, from side of generating set, it is still a kind of direct current exciting device in essence.
Utility model content
The utility model realizing the lifting of AC excitation current transformer output voltage grade by providing a kind of when avoiding use high-voltage semiconductor switching device, also meeting the New Cascading formula AC excitation device being used for variable-ratio pumped storage system of the requirement of exciter converter bi-directional energy flow simultaneously.
For realizing above-mentioned technique effect, technical solutions of the utility model are as follows:
For a tandem type AC excitation device for variable-ratio pumped storage system, it is characterized in that: comprise rotor side parallel switch module, multi winding transformer module and three-phase tandem type H bridge module back-to-back; Described rotor side parallel switch module is connected with multi winding transformer module, and described multi winding transformer module and three-phase tandem type back-to-back H bridge module are connected.
Described rotor side parallel switch module comprises one group of three-phase input side terminal and one group of three-phase outlet side terminal;
Described multi winding transformer module comprise a former limit winding and
nindividual belong to A phase vice-side winding,
nindividual belong to B phase vice-side winding and
nthe individual vice-side winding belonging to C phase, wherein
nfor natural number, all vice-side winding are single-phase winding, are electrically isolated from one another, and rated voltage is identical;
Described three-phase tandem type back-to-back H bridge module comprises the identical A phase of structure, B phase and C phase;
The described three-phase tandem type back-to-back A phase of H bridge module, B phase includes with C phase
nto input terminal, a lead-out terminal and a neutral terminal, wherein
nfor natural number;
The three-phase input side terminal of described rotor side parallel switch module is connected with three phase network, and described three-phase outlet side terminal is connected with the former limit winding of described multi winding transformer module;
The former limit winding of described multi winding transformer module is connected with described rotor side parallel switch module, described multi winding transformer module
nin the A phase of the vice-side winding of individual A phase and described three-phase tandem type H bridge module back-to-back
ninput terminal correspondence is connected; The secondary of described multi winding transformer module
nin the B phase of the vice-side winding of individual B phase and described three-phase tandem type H bridge module back-to-back
ninput terminal correspondence is connected; The secondary of described multi winding transformer module
nin the C phase of the vice-side winding of individual C phase and described three-phase tandem type H bridge module back-to-back
ninput terminal correspondence is connected, wherein
nfor natural number;
The lead-out terminal of the described three-phase tandem type A phase of H bridge module is back-to-back connected to the A phase winding of ac excited generator rotor, the B phase output terminals of described three-phase tandem type H bridge module is back-to-back connected to the B phase winding of ac excited generator rotor, the C phase output terminals of described three-phase tandem type H bridge module is back-to-back connected to the C phase winding of ac excited generator rotor, and the neutral terminal of described three-phase tandem type the A phase of H bridge module, B phase and C phase back-to-back is all connected to neutral point N.
Back-to-back in the A phase of H bridge module, B phase and C phase each group of described three-phase tandem type includes
nindividual identical H-bridge unit back-to-back, wherein
nfor natural number;
In the A phase of described three-phase tandem type H bridge module back-to-back, the rectification side H bridge input terminal of each H-bridge unit is back-to-back corresponding with each vice-side winding of A phase of described multi winding transformer module secondary connected;
In the A phase of described three-phase tandem type H bridge module back-to-back, each H-bridge unit inverter side back-to-back presses daisy chaining cascade, a lead-out terminal and a neutral terminal is formed after cascade, wherein lead-out terminal is connected to ac excited generator rotor A phase winding, and neutral terminal is connected to neutral point N.
Described H-bridge unit back-to-back comprises rectification side H bridge, dc-link capacitance and inverter side H bridge, forms back to back structure in parallel;
The rectification side direct current plus end of rectification side H bridge is connected with the inverter side direct current plus end of dc-link capacitance positive pole and inverter side H bridge; The rectification side direct current negative terminal of rectification side H bridge is connected with the inverter side direct current negative terminal of dc-link capacitance negative pole and described inverter side H bridge.
The rectification side ac terminal of a pair rectification side H bridge draws the input terminal of H-bridge unit back-to-back described in formation; The inverter side ac terminal of a pair inverter side H bridge draws the lead-out terminal of H-bridge unit back-to-back described in formation.
Described rectification side H bridge comprises two parallel with one another and switch brachium pontis of same structure.
Each described switch brachium pontis comprises two forced reversing switching devices of connecting up and down, be respectively switching device and lower switching device, the emitter wherein going up switching device and the current collection of lower switching device are very connected common point, and described common point draws the ac terminal as switch brachium pontis;
The direct current plus end as switch brachium pontis drawn by the collector electrode of upper switching device, and the emitter of lower switching device draws the direct current negative terminal as switch brachium pontis, and the direct current plus end of two switch brachium pontis connects together, and direct current negative terminal also connects together;
Two ac terminals of two switch brachium pontis are all drawn as rectification side H bridge input terminal.
Described inverter side H bridge construction is identical with described rectification side H bridge with connected mode, and two ac terminals of two switch brachium pontis of inverter side H bridge are all drawn as inverter side H bridge lead-out terminal.
The described tandem type AC excitation device for variable-ratio pumped storage system works in such a way:
During normal work, the grid-connected switch of stator side of ac excited generator is in closure state, described rotor side parallel switch module is in closure state, described multi winding transformer module former limit access electrical network, each winding of secondary is then for the rectification side of each H bridge module back-to-back provides the separate single be electrically isolated from one another phase voltage;
By controlling the A phase making described three-phase tandem type H bridge module back-to-back, B phase, C phase produces three-phase symmetrical Alternating Current Excitation voltage between lead-out terminal and neutral point N, if the first-harmonic of this Alternating Current Excitation voltage is positive phase sequence, then and its fundamental frequency
ffor just; If the first-harmonic of this Alternating Current Excitation voltage is negative-phase sequence, then its fundamental frequency value
fbe negative, require the fundamental frequency value of this Alternating Current Excitation voltage
fthe frequency of line voltage is equaled with the algebraical sum of the rotor electricity frequency of ac excited generator.Require that this Alternating Current Excitation voltage has suitable amplitude, to ensure that ac excited generator reaches generated output or the electric power of expectation simultaneously.
For in A phase, B phase, C phase produces three-phase symmetrical Alternating Current Excitation voltage between lead-out terminal and neutral point N, the A of described three-phase tandem type H bridge module back-to-back, B, C phase divide into groups in each back-to-back H bridge module work as follows:
By controlling each conducting situation of rectification side forced reversing switching device in H bridge module back-to-back, the DC bus-bar voltage of H bridge module is back-to-back stabilized on a unified rated value, and requires that this rated value is a little more than the d-c bus voltage value of H bridge module rectification side under uncontrollable rectifier state back-to-back;
By controlling each conducting situation of adverse current side forced reversing switching device in H bridge module back-to-back, make in same grouping mutually
nproduce between the inverter side output of the individual bridge module of H back-to-back
nthe pulse width modulated wave that individual fundamental phase is identical, its fundamental frequency and described three-phase tandem type be total exciting voltage fundamental frequency of producing of H bridge module back-to-back
fequal, its fundamental voltage amplitude be then described three-phase tandem type back-to-back H bridge module produce total exciting voltage fundamental voltage amplitude 1/
n.
The utility model advantage is:
1, there is converting operation ability, the excitation requirement that pumped storage machine runs variable-speed operation can be met;
2, there is bi-directional energy flow ability, the excitation requirement that pumped storage machine runs at generating operation mode and electronic operating mode can be met simultaneously.
3, there is cascade characteristic, when avoiding the access realizing AC excitation current transformer voltage levels when using special high-voltage semiconductor switching device;
4, there is modular nature, after expansion can after be applicable to the ac excited generator of multiple voltage grade.
Accompanying drawing explanation
Fig. 1 is tandem type AC excitation device general illustration of the present utility model.
Fig. 2 is the single-phase composition schematic diagram of tandem type AC excitation device of the present utility model.
Fig. 3 is tandem type AC excitation device of the present utility model H bridge module composition schematic diagram back-to-back.
Fig. 4 is the bridge module of the H back-to-back detailed schematic of specific embodiment of the utility model.
Fig. 5 is the tandem type AC excitation device schematic diagram of the utility model embodiment 5.
In accompanying drawing: rotor side parallel switch module 1, multi winding transformer module 2, three-phase tandem type is H bridge module 3 back-to-back, ac excited generator 4, three phase network 5, pump turbine 6.
The three-phase input side terminal 11 of rotor side parallel switch module 1, three-phase outlet side terminal 12;
The former limit winding 21 of multi winding transformer module 2, vice-side winding 22;
A phase 31, B phase 32, the C phase 33 of three-phase tandem type H bridge module 3 back-to-back, input terminal 34, lead-out terminal 35, neutral terminal 36, neutral point N37, back-to-back H-bridge unit 38;
Rotor A phase winding 41, B phase winding 42, the C phase winding 43 of ac excited generator 4;
Pair of input terminals 44, pair of output 45, rectification side H bridge 381, dc-link capacitance 382, the inverter side H bridge 383 of H-bridge unit 38 back-to-back,
The rectification side direct current plus end 384 of H-bridge unit 38 back-to-back, inverter side direct current plus end 385, rectification side direct current negative terminal 386, inverter side direct current negative terminal 387, rectification side ac terminal 388, inverter side ac terminal 389, switch brachium pontis 390, upper switching device 391, lower switching device 392.
Embodiment
Embodiment 1
A kind of tandem type AC excitation device for variable-ratio pumped storage system comprises rotor side parallel switch module 1, multi winding transformer module 2 and three-phase tandem type H bridge module 3 back-to-back; Described rotor side parallel switch module 1 is connected with multi winding transformer module 2, and described multi winding transformer module 2 and three-phase tandem type back-to-back H bridge module 3 are connected.
Embodiment 2
A kind of tandem type AC excitation device for variable-ratio pumped storage system comprises rotor side parallel switch module 1, multi winding transformer module 2 and three-phase tandem type H bridge module 3 back-to-back; Described rotor side parallel switch module 1 is connected with multi winding transformer module 2, and described multi winding transformer module 2 and three-phase tandem type back-to-back H bridge module 3 are connected.Described rotor side parallel switch module 1 comprises one group of three-phase input side terminal 11 and one group of three-phase outlet side terminal 12.Described multi winding transformer module 2 comprise a former limit winding 21 and
nthe individual vice-side winding 22 belonging to A phase 31,
nindividual vice-side winding 22 He belonging to B phase 32
nthe individual vice-side winding 22 belonging to C phase 33, wherein
nfor natural number, all vice-side winding 22 are single-phase winding, be electrically isolated from one another, and rated voltage are identical.Described three-phase tandem type back-to-back H bridge module 3 comprises identical A phase 31, the B phase 32 of structure and C phase 33.
Embodiment 3
A kind of tandem type AC excitation device for variable-ratio pumped storage system comprises rotor side parallel switch module 1, multi winding transformer module 2 and three-phase tandem type H bridge module 3 back-to-back; Described rotor side parallel switch module 1 is connected with multi winding transformer module 2, and described multi winding transformer module 2 and three-phase tandem type back-to-back H bridge module 3 are connected.Described rotor side parallel switch module 1 comprises one group of three-phase input side terminal 11 and one group of three-phase outlet side terminal 12.Described multi winding transformer module 2 comprise a former limit winding 21 and
nthe individual vice-side winding 22 belonging to A phase 31,
nindividual vice-side winding 22 He belonging to B phase 32
nthe individual vice-side winding 22 belonging to C phase 33, wherein
nfor natural number, all vice-side winding 22 are single-phase winding, be electrically isolated from one another, and rated voltage are identical.Described three-phase tandem type back-to-back H bridge module 3 comprises identical A phase 31, the B phase 32 of structure and C phase 33.
The described three-phase tandem type back-to-back A phase 31 of H bridge module 3, B phase 32 and C phase 33 includes
nto input terminal 34, lead-out terminal 35 and a neutral terminal 36, wherein
nfor natural number.
The three-phase input side terminal 11 of described rotor side parallel switch module 1 is connected with three phase network 5, and described three-phase outlet side terminal 12 is connected with the former limit winding 21 of described multi winding transformer module 2.
The former limit winding 21 of described multi winding transformer module 2 is connected with described rotor side parallel switch module 1, described multi winding transformer module 2
nin the A phase 31 of the vice-side winding 22 of individual A phase 31 and described three-phase tandem type H bridge module 3 back-to-back
ninput terminal 34 correspondence is connected; The secondary of described multi winding transformer module 2
nin the B phase 32 of the vice-side winding 22 of individual B phase 32 and described three-phase tandem type H bridge module 3 back-to-back
ninput terminal 34 correspondence is connected; The secondary of described multi winding transformer module 2
nin the C phase 33 of the vice-side winding 22 of individual C phase 33 and described three-phase tandem type H bridge module 3 back-to-back
ninput terminal 34 correspondence is connected, wherein
nfor natural number.
The lead-out terminal 35 of the described three-phase tandem type A phase 31 of H bridge module 3 is back-to-back connected to the A phase winding 41 of ac excited generator 4 rotor, B phase 32 lead-out terminal 35 of described three-phase tandem type H bridge module 3 is back-to-back connected to the B phase winding 42 of ac excited generator 4 rotor, C phase 33 lead-out terminal 35 of described three-phase tandem type H bridge module 3 is back-to-back connected to the C phase winding 43 of ac excited generator 4 rotor, and the neutral terminal 36 of described three-phase tandem type the A phase 31 of H bridge module 3, B phase 32 and C phase 33 back-to-back is all connected to neutral point N37.
Embodiment 4
A kind of tandem type AC excitation device for variable-ratio pumped storage system comprises rotor side parallel switch module 1, multi winding transformer module 2 and three-phase tandem type H bridge module 3 back-to-back; Described rotor side parallel switch module 1 is connected with multi winding transformer module 2, and described multi winding transformer module 2 and three-phase tandem type back-to-back H bridge module 3 are connected.
Described rotor side parallel switch module 1 comprises one group of three-phase input side terminal 11 and one group of three-phase outlet side terminal 12;
Described multi winding transformer module 2 comprise a former limit winding 21 and
nthe individual vice-side winding 22 belonging to A phase 31,
nindividual vice-side winding 22 He belonging to B phase 32
nthe individual vice-side winding 22 belonging to C phase 33, wherein
nfor natural number, all vice-side winding 22 are single-phase winding, be electrically isolated from one another, and rated voltage are identical;
Described three-phase tandem type back-to-back H bridge module 3 comprises identical A phase 31, the B phase 32 of structure and C phase 33;
The described three-phase tandem type back-to-back A phase 31 of H bridge module 3, B phase 32 and C phase 33 includes
nto input terminal 34, lead-out terminal 35 and a neutral terminal 36, wherein
nfor natural number;
The three-phase input side terminal 11 of described rotor side parallel switch module 1 is connected with three phase network 5, and described three-phase outlet side terminal 12 is connected with the former limit winding 21 of described multi winding transformer module 2;
The former limit winding 21 of described multi winding transformer module 2 is connected with described rotor side parallel switch module 1, described multi winding transformer module 2
nin the A phase 31 of the vice-side winding 22 of individual A phase 31 and described three-phase tandem type H bridge module 3 back-to-back
ninput terminal 34 correspondence is connected; The secondary of described multi winding transformer module 2
nin the B phase 32 of the vice-side winding 22 of individual B phase 32 and described three-phase tandem type H bridge module 3 back-to-back
ninput terminal 34 correspondence is connected; The secondary of described multi winding transformer module 2
nin the C phase 33 of the vice-side winding 22 of individual C phase 33 and described three-phase tandem type H bridge module 3 back-to-back
ninput terminal 34 correspondence is connected, wherein
nfor natural number;
The lead-out terminal 35 of the described three-phase tandem type A phase 31 of H bridge module 3 is back-to-back connected to the A phase winding 41 of ac excited generator 4 rotor, B phase 32 lead-out terminal 35 of described three-phase tandem type H bridge module 3 is back-to-back connected to the B phase winding 42 of ac excited generator 4 rotor, C phase 33 lead-out terminal 35 of described three-phase tandem type H bridge module 3 is back-to-back connected to the C phase winding 43 of ac excited generator 4 rotor, and the neutral terminal 36 of described three-phase tandem type the A phase 31 of H bridge module 3, B phase 32 and C phase 33 back-to-back is all connected to neutral point N37.
Back-to-back in the A phase 31 of H bridge module 3, B phase 32 and C phase 33 each group of described three-phase tandem type includes
nindividual identical H-bridge unit back-to-back 38, wherein
nfor natural number;
In the A phase 31 of described three-phase tandem type H bridge module 3 back-to-back, rectification side H bridge 381 input terminal 34 of each H-bridge unit 38 is back-to-back corresponding with each vice-side winding of A phase 31 22 of described multi winding transformer module 2 secondary connected;
In the A phase 31 of described three-phase tandem type H bridge module 3 back-to-back, each H-bridge unit 38 inverter side back-to-back presses daisy chaining cascade, a lead-out terminal 35 and a neutral terminal 36 is formed after cascade, wherein lead-out terminal 35 is connected to ac excited generator 4 rotor A phase winding 41, and neutral terminal 36 is connected to neutral point N37.
Described H-bridge unit back-to-back 38 comprises pair of input terminals 44, pair of output 45, rectification side H bridge 381, dc-link capacitance 382 and inverter side H bridge 383, forms back to back structure in parallel;
The rectification side direct current plus end 384 of rectification side H bridge 381 is connected with the inverter side direct current plus end 385 of dc-link capacitance 382 positive pole and inverter side H bridge 383; The rectification side direct current negative terminal 386 of rectification side H bridge 381 is connected with the inverter side direct current negative terminal 387 of dc-link capacitance 382 negative pole and described inverter side H bridge 383.
A pair ac terminal 388 of rectification side H bridge 381 draws the input terminal 44 of H-bridge unit 38 back-to-back described in formation; A pair ac terminal 389 of inverter side H bridge 383 draws the lead-out terminal 45 of H-bridge unit 38 back-to-back described in formation.
Described rectification side H bridge 381 comprises two parallel with one another and switch brachium pontis 390 of same structure.
Each described switch brachium pontis 390 comprises two forced reversing switching devices of connecting up and down, be respectively switching device 391 and lower switching device 392, the emitter wherein going up switching device 391 and the current collection of lower switching device 392 are very connected common point, and described common point draws the ac terminal as switch brachium pontis 390;
The direct current plus end as switch brachium pontis 390 drawn by the collector electrode of upper switching device 391, the emitter of lower switching device 392 draws the direct current negative terminal as switch brachium pontis 390, the direct current plus end of two switch brachium pontis 390 connects together, and direct current negative terminal also connects together;
Two ac terminals of two switch brachium pontis 390 all draw the input terminal 388 as rectification side H bridge 381.
Described inverter side H bridge 383 structure is identical with described rectification side H bridge 381 with connected mode, and two ac terminals of two switch brachium pontis of inverter side H bridge 383 are all drawn as inverter side H bridge 383 lead-out terminal 389.
The described tandem type AC excitation device for variable-ratio pumped storage system works in such a way:
During normal work, the grid-connected switch of stator side of ac excited generator 4 is in closure state, described rotor side parallel switch module 1 is in closure state, described multi winding transformer module 2 former limit access electrical network, each winding of secondary is then for the rectification side of each H bridge module back-to-back provides the separate single be electrically isolated from one another phase voltage;
By controlling to make A phase 31, B phase 32, the C phase 33 of described three-phase tandem type H bridge module 3 back-to-back produce three-phase symmetrical Alternating Current Excitation voltage between lead-out terminal 35 and neutral point N37, if the first-harmonic of this Alternating Current Excitation voltage is positive phase sequence, then its fundamental frequency
ffor just; If the first-harmonic of this Alternating Current Excitation voltage is negative-phase sequence, then its fundamental frequency value
fbe negative, require the fundamental frequency value of this Alternating Current Excitation voltage
fthe frequency of line voltage is equaled with the algebraical sum of the rotor electricity frequency of ac excited generator 4.Require that this Alternating Current Excitation voltage has suitable amplitude, to ensure that ac excited generator 4 reaches generated output or the electric power of expectation simultaneously.
For producing three-phase symmetrical Alternating Current Excitation voltage in A phase 31, B phase 32, C phase 33 between lead-out terminal 35 and neutral point N37, the A of described three-phase tandem type H bridge module 3 back-to-back, B, C phase 33 divide into groups in each back-to-back H bridge module work as follows:
By controlling each conducting situation of rectification side forced reversing switching device in H bridge module back-to-back, the DC bus-bar voltage of H bridge module is back-to-back stabilized on a unified rated value, and requires that this rated value is a little more than the d-c bus voltage value of H bridge module rectification side under uncontrollable rectifier state back-to-back;
By controlling each conducting situation of adverse current side forced reversing switching device in H bridge module back-to-back, make in same grouping mutually
nproduce between the inverter side output of the individual bridge module of H back-to-back
nthe pulse width modulated wave that individual fundamental phase is identical, its fundamental frequency and described three-phase tandem type be total exciting voltage fundamental frequency of producing of H bridge module 3 back-to-back
fequal, its fundamental voltage amplitude be then described three-phase tandem type back-to-back H bridge module 3 produce total exciting voltage fundamental voltage amplitude 1/
n.
Embodiment 5
Fig. 5 is a specific embodiment of the present utility model, and this tandem type AC excitation device embodiment being used for variable-ratio pumped storage system is as follows:
This is used for the tandem type AC excitation device of variable-ratio pumped storage system, comprises rotor side parallel switch module 1, multi winding transformer module 2 and three-phase tandem type H bridge module 3 back-to-back.Described rotor side parallel switch module 1 is connected with multi winding transformer module 2, and described multi winding transformer module 2 and three-phase tandem type back-to-back H bridge module 3 are connected.Pump turbine 6 is connected with ac excited generator 4, and ac excited generator 4 and three-phase tandem type back-to-back H bridge module 3 are connected.
1.
A) rotor side parallel switch module 1 comprises one group of three-phase input side terminal 11 and one group of three-phase outlet side terminal 12.
B) multi winding transformer module 2 by a former limit winding 21 and
5the individual vice-side winding 22 belonging to A phase 31,
5individual vice-side winding 22 He belonging to B phase 32
5the vice-side winding 22 of the individual C of belonging to phase 33 forms.All vice-side winding 22 are single-phase winding, be electrically isolated from one another, and rated voltage are identical.
C) three-phase tandem type back-to-back H bridge module 3 be divided into structure identical A phase 31, B phase 32 and C phase 33.
D) the A phase 31 of three-phase tandem type H bridge module 3 back-to-back comprises
5to input terminal 34, a lead-out terminal 35 and a neutral terminal 36.Three-phase tandem type back-to-back the B phase 32 of H bridge module 3 and C phase 33 situation similar.
E) the three-phase input side terminal 11 of rotor side parallel switch module 1 is connected with three phase network 5, and three-phase outlet side terminal 12 is connected with the former limit winding 21 of multi winding transformer module 2.
F) multi winding transformer module 2 former limit winding 21 is connected with rotor side parallel switch module 1, the A phase 31 of multi winding transformer module 2 secondary
5the A phase 31 of individual winding and three-phase tandem type H bridge module 3 back-to-back
5input terminal 34 correspondence is connected.The former limit winding 21 of multi winding transformer module 2 is connected with rotor side parallel switch module 1, the B phase 32 of multi winding transformer module 2 secondary
5the B phase 32 of individual winding and three-phase tandem type H bridge module 3 back-to-back
5input terminal 34 correspondence is connected.C phase 33 connection is similar with A, B phase 32.
G) A phase 31 lead-out terminal 35 of three-phase tandem type H bridge module 3 is back-to-back connected to ac excited generator 4 rotor A phase winding 41, and neutral terminal 36 is connected to neutral point N37.B phase 32 lead-out terminal 35 of three-phase tandem type H bridge module 3 is back-to-back connected to ac excited generator 4 rotor B phase winding 42, and neutral terminal 36 is connected to neutral point N37.C phase 33 connection is similar with A, B phase 32.
2. three-phase tandem type back-to-back H bridge module 3 be divided into A phase 31, B phase 32, C phase 33 3 groups, often group comprises 5 identical H-bridge unit back-to-back 38.
In the A phase 31 of a) three-phase tandem type H bridge module 3 back-to-back, each H-bridge unit 38 rectification side H bridge 381 input terminal 34 is back-to-back corresponding with each vice-side winding of A phase 31 22 of multi winding transformer module 2 secondary connected.
In the A phase 31 of b) three-phase tandem type H bridge module 3 back-to-back, each H-bridge unit 38 inverter side back-to-back presses daisy chaining cascade, a lead-out terminal 35 and a neutral terminal 36 is formed after cascade, wherein lead-out terminal 35 is connected to ac excited generator 4 rotor A phase winding 41, and neutral terminal 36 is connected to neutral point N37.
C) B, C phase 33 connection of three-phase tandem type H bridge module 3 is back-to-back similar with A phase 31.
3. H-bridge unit 38 is made up of pair of input terminals 44, pair of output 45, rectification side H bridge 381, dc-link capacitance 382 and inverter side H bridge 383 back-to-back, forms back to back structure in parallel.
A) the rectification side direct current plus end 384 of rectification side H bridge 381 is connected with the inverter side direct current plus end 385 of dc-link capacitance 382 positive pole and inverter side H bridge 383.The direct current negative terminal of rectification side H bridge 381 is connected with the inverter side direct current negative terminal 387 of dc-link capacitance 382 negative pole and inverter side H bridge 383.
B) a pair ac terminal 388 of rectification side H bridge 381 draws the input terminal 44 of H-bridge unit 38 back-to-back described in formation; A pair ac terminal 389 of inverter side H bridge 383 draws the lead-out terminal 45 of H-bridge unit 38 back-to-back described in formation.
4. rectification side H bridge 381 is composed in parallel by the switch brachium pontis 390 of two same structures.
A) each switch brachium pontis 390 is made up of two IGBT switching devices of connecting up and down, and the emitter wherein going up IGBT switching device and the current collection of lower IGBT switching device are very connected common point, and this common point draws the ac terminal as switch brachium pontis 390.
B) the direct current plus end as brachium pontis drawn by the collector electrode of upper IGBT switching device, and the emitter of lower IGBT switching device draws the direct current negative terminal as brachium pontis.The direct current plus end of two switch brachium pontis 390 connects together, and direct current negative terminal also connects together.
C) two ac terminals of two switch brachium pontis 390 all draw the input terminal 388 as rectification side H bridge 381.
5. inverter side H bridge 383 is composed in parallel by the switch brachium pontis 390 of two same structures equally, and connected mode is identical with rectifier bridge.Two ac terminals of two switch brachium pontis are all drawn as inverter side H bridge 383 lead-out terminal 389.
6. this tandem type AC excitation device being used for variable-ratio pumped storage system works in such a way:
When a) normally working, the grid-connected switch of stator side of ac excited generator 4 is in closure state.Rotor side parallel switch module 1 is in closure state.Multi winding transformer module 2 former limit access electrical network, each winding of secondary is then for the rectification side of each H bridge module back-to-back provides the separate single be electrically isolated from one another phase voltage.
B) by controlling to make A phase 31, B phase 32, the C phase 33 of three-phase tandem type H bridge module 3 back-to-back produce three-phase symmetrical Alternating Current Excitation voltage between lead-out terminal 35 and neutral point N37.If the first-harmonic of this Alternating Current Excitation voltage is positive phase sequence, then its fundamental frequency
ffor just; If the first-harmonic of this Alternating Current Excitation voltage is negative-phase sequence, then its fundamental frequency value
fbe negative.Require the fundamental frequency value of this Alternating Current Excitation voltage
fthe frequency of line voltage is equaled with the algebraical sum of the rotor electricity frequency of ac excited generator 4.Require that this Alternating Current Excitation voltage has suitable amplitude, to ensure that ac excited generator 4 reaches generated output or the electric power of expectation simultaneously.
7. be between lead-out terminal 35 and neutral point N37, produce three-phase symmetrical Alternating Current Excitation voltage in A phase 31, B phase 32, C phase 33, the A of three-phase tandem type H bridge module 3 back-to-back, B, C phase 33 divide into groups in each back-to-back H bridge module work as follows:
A) by controlling each conducting situation of rectification side forced reversing switching device in H bridge module back-to-back, the DC bus-bar voltage of H bridge module is back-to-back stabilized on a unified rated value, and requires that this rated value is a little more than the d-c bus voltage value of H bridge module rectification side under uncontrollable rectifier state back-to-back.
B) by controlling each conducting situation of adverse current side forced reversing switching device in H bridge module back-to-back, make in same grouping mutually
5produce between the inverter side output of the individual bridge module of H back-to-back
5the pulse width modulated wave that individual fundamental phase is identical, its fundamental frequency and three-phase tandem type be total exciting voltage fundamental frequency of producing of H bridge module 3 back-to-back
fequal, its fundamental voltage amplitude be then three-phase tandem type back-to-back H bridge module 3 produce total exciting voltage fundamental voltage amplitude 1/
5.
Claims (8)
1. for a tandem type AC excitation device for variable-ratio pumped storage system, it is characterized in that: comprise rotor side parallel switch module (1), multi winding transformer module (2) and three-phase tandem type H bridge module (3) back-to-back; Described rotor side parallel switch module (1) is connected with multi winding transformer module (2), and described multi winding transformer module (2) and three-phase tandem type back-to-back H bridge module (3) are connected.
2. a kind of tandem type AC excitation device for variable-ratio pumped storage system according to claim 1, is characterized in that: described rotor side parallel switch module (1) comprises one group of three-phase input side terminal (11) and one group of three-phase outlet side terminal (12);
Described multi winding transformer module (2) comprise former limit winding (21) and
nindividual belong to A phase (31) vice-side winding (22),
nindividual belong to B phase (32) vice-side winding (22) and
nthe individual vice-side winding (22) belonging to C phase (33), wherein
nfor natural number, all vice-side winding (22) are single-phase winding, be electrically isolated from one another, and rated voltage are identical;
Described three-phase tandem type back-to-back H bridge module (3) comprises structure identical A phase (31), B phase (32) and C phase (33).
3. a kind of tandem type AC excitation device for variable-ratio pumped storage system according to claim 2, is characterized in that:
The described three-phase tandem type back-to-back A phase (31) of H bridge module (3), B phase (32) and C phase (33) includes
nto input terminal (34), a lead-out terminal (35) and a neutral terminal (36), wherein
nfor natural number;
The three-phase input side terminal (11) of described rotor side parallel switch module (1) is connected with three phase network (5), and described three-phase outlet side terminal (12) is connected with former limit winding (21) of described multi winding transformer module (2);
Former limit winding (21) of described multi winding transformer module (2) is connected with described rotor side parallel switch module (1), described multi winding transformer module (2)
nin the A phase (31) of the vice-side winding (22) of individual A phase (31) and described three-phase tandem type H bridge module (3) back-to-back
ninput terminal (34) correspondence is connected; The secondary of described multi winding transformer module (2)
nin the B phase (32) of the vice-side winding (22) of individual B phase (32) and described three-phase tandem type H bridge module (3) back-to-back
ninput terminal (34) correspondence is connected; The secondary of described multi winding transformer module (2)
nin the C phase (33) of the vice-side winding (22) of individual C phase (33) and described three-phase tandem type H bridge module (3) back-to-back
ninput terminal (34) correspondence is connected, wherein
nfor natural number;
The lead-out terminal (35) of the described three-phase tandem type A phase (31) of H bridge module (3) is back-to-back connected to the A phase winding (41) of ac excited generator (4) rotor, B phase (32) lead-out terminal (35) of described three-phase tandem type H bridge module (3) is back-to-back connected to the B phase winding (42) of ac excited generator (4) rotor, C phase (33) lead-out terminal (35) of described three-phase tandem type H bridge module (3) is back-to-back connected to the C phase winding (43) of ac excited generator (4) rotor, the A phase (31) of described three-phase tandem type H bridge module (3) back-to-back, the neutral terminal (36) of B phase (32) and C phase (33) is all connected to neutral point N(37).
4. a kind of tandem type AC excitation device for variable-ratio pumped storage system according to claim 3, is characterized in that: back-to-back in the A phase (31) of H bridge module (3), B phase (32) and C phase (33) each group of described three-phase tandem type includes
nindividual identical H-bridge unit back-to-back (38), wherein
nfor natural number;
In the A phase (31) of described three-phase tandem type H bridge module (3) back-to-back, rectification side H bridge (381) input terminal (34) of each H-bridge unit (38) is back-to-back corresponding with A phase (31) each vice-side winding (22) of described multi winding transformer module (2) secondary connected;
In the A phase (31) of described three-phase tandem type H bridge module (3) back-to-back, each H-bridge unit (38) inverter side back-to-back presses daisy chaining cascade, a lead-out terminal (35) and a neutral terminal (36) is formed after cascade, wherein lead-out terminal (35) is connected to ac excited generator (4) rotor A phase winding (41), and neutral terminal (36) is connected to neutral point N(37).
5. a kind of tandem type AC excitation device for variable-ratio pumped storage system according to claim 4, it is characterized in that: described H-bridge unit back-to-back (38) comprises pair of input terminals (44), pair of output (45), rectification side H bridge (381), dc-link capacitance (382) and inverter side H bridge (383), forms back to back structure in parallel;
The rectification side direct current plus end (384) of rectification side H bridge (381) is connected with the inverter side direct current plus end (385) of dc-link capacitance (382) positive pole and inverter side H bridge (383); The rectification side direct current negative terminal (386) of rectification side H bridge (381) is connected with the inverter side direct current negative terminal (387) of dc-link capacitance (382) negative pole and described inverter side H bridge (383);
A pair ac terminal (388) of rectification side H bridge (381) draws the input terminal (44) of H-bridge unit (38) back-to-back described in formation; A pair ac terminal (389) of inverter side H bridge (383) draws the lead-out terminal (45) of H-bridge unit (38) back-to-back described in formation.
6. a kind of tandem type AC excitation device for variable-ratio pumped storage system according to claim 5, is characterized in that: described rectification side H bridge (381) comprises two parallel with one another and switch brachium pontis (390) of same structure.
7. a kind of tandem type AC excitation device for variable-ratio pumped storage system according to claim 6, it is characterized in that: each described switch brachium pontis (390) comprises two forced reversing switching devices of connecting up and down, be respectively switching device (391) and lower switching device (392), the emitter wherein going up switching device (391) and the current collection of lower switching device (392) are very connected common point, and described common point draws the ac terminal as switch brachium pontis (390);
The direct current plus end as switch brachium pontis (390) drawn by the collector electrode of upper switching device (391), the emitter of lower switching device (392) draws the direct current negative terminal as switch brachium pontis (390), the direct current plus end of two switch brachium pontis (390) connects together, and direct current negative terminal also connects together;
Two ac terminals of two switch brachium pontis (390) are all drawn as rectification side H bridge (381) input terminal (388).
8. a kind of tandem type AC excitation device for variable-ratio pumped storage system according to claim 7, it is characterized in that: described inverter side H bridge (383) structure is identical with described rectification side H bridge (381) with connected mode, and two ac terminals of two switch brachium pontis of inverter side H bridge (383) are all drawn as inverter side H bridge (383) lead-out terminal (389).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162379A (en) * | 2015-08-21 | 2015-12-16 | 中国东方电气集团有限公司 | Cascade alternating-current excitation device for variable-speed pumped storage power generation system |
| CN112787563A (en) * | 2021-01-28 | 2021-05-11 | 南京航空航天大学 | Stepped-region self-regulating magnetic stepless speed regulating system and method based on rotor magnetic pole modulation |
| CN113093007A (en) * | 2021-04-29 | 2021-07-09 | 哈动国家水力发电设备工程技术研究中心有限公司 | Subsynchronous load test method for electric working condition of variable-speed motor |
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2015
- 2015-08-21 CN CN201520634010.0U patent/CN204836014U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162379A (en) * | 2015-08-21 | 2015-12-16 | 中国东方电气集团有限公司 | Cascade alternating-current excitation device for variable-speed pumped storage power generation system |
| CN112787563A (en) * | 2021-01-28 | 2021-05-11 | 南京航空航天大学 | Stepped-region self-regulating magnetic stepless speed regulating system and method based on rotor magnetic pole modulation |
| CN112787563B (en) * | 2021-01-28 | 2022-06-17 | 南京航空航天大学 | Stepped-region self-regulating magnetic stepless speed regulating system and method based on rotor magnetic pole modulation |
| CN113093007A (en) * | 2021-04-29 | 2021-07-09 | 哈动国家水力发电设备工程技术研究中心有限公司 | Subsynchronous load test method for electric working condition of variable-speed motor |
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Effective date of registration: 20180426 Address after: 610000 18 West core road, hi-tech West District, Chengdu, Sichuan Patentee after: Dongfang Electric Co., Ltd. Address before: 610036 Shu Han Road, Jinniu District, Chengdu, Sichuan Province, No. 333 Patentee before: Dongfang Electric Corporation |
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