CN204859051U - Variable -ratio water -storage power generation system's high frequency isolation cascading interchange exciting arrangement - Google Patents
Variable -ratio water -storage power generation system's high frequency isolation cascading interchange exciting arrangement Download PDFInfo
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- CN204859051U CN204859051U CN201520634007.9U CN201520634007U CN204859051U CN 204859051 U CN204859051 U CN 204859051U CN 201520634007 U CN201520634007 U CN 201520634007U CN 204859051 U CN204859051 U CN 204859051U
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Abstract
The utility model relates to a water -storage power generation sector, in particular to variable -ratio water -storage power generation system's high frequency isolation cascading interchange exciting arrangement, be incorporated into the power networks switch module, transformer module and three -phase tandem type including rotor side and keep apart two H bridge modules back -to -back, rotor side is incorporated into the power networks the switch module and links to each other with transformer module, transformer module keeps apart two H bridge modules back -to -back with the three -phase tandem type and links to each other. The utility model discloses have 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 high-frequency isolation cascade AC excitation device of 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 control occasion at present.In tradition cascaded H-bridges topology, adopt special Multiple coil Industrial Frequency Transformer to realize bus isolation and circulation is drawn up, but jumbo Multiple coil Industrial Frequency Transformer cost is higher, bulky, is the deficiency of this scheme more.In addition, traditional frequency conversion speed governing 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 for high-frequency isolation tandem type AC excitation device, to meet the excitation demand of variable-ratio pumped storage 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 will provide a kind of high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system, the lifting of AC excitation current transformer output voltage grade is realized when avoiding use high-voltage semiconductor switching device, both meet the requirement of AC excitation current transformer bi-directional energy flow, eliminate again bulky Multiple coil Industrial Frequency Transformer.
For realizing above-mentioned technique effect, technical solutions of the utility model are as follows:
A high-frequency isolation cascade AC excitation device for variable-ratio pumped storage system, is characterized in that: comprise the two H bridge module back-to-back of rotor side parallel switch module, transformer module and three-phase tandem type isolation; Described rotor side parallel switch module is connected with transformer module, and described transformer module and three-phase tandem type are isolated two H bridge module back-to-back and be 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 transformer module comprises a former limit winding and a vice-side winding;
The two H bridge module back-to-back of described three-phase tandem type isolation is divided into the identical A phase of structure, B phase and C phase;
The A phase of the two H bridge module back-to-back of described three-phase tandem type isolation comprises an input terminal, an input neutral terminal, a lead-out terminal and an output neutral terminal; The B phase of the two H bridge module back-to-back of described three-phase tandem type isolation is all identical with A phase structure with C phase;
The three-phase input side terminal of described rotor side parallel switch module is connected with three phase network, and three-phase outlet side terminal is connected with the former limit winding of described transformer module;
Described transformer module former limit winding is connected with described rotor side parallel switch module, and the input terminal that A phase terminal and the described three-phase tandem type of transformer module vice-side winding isolate two A phase of H bridge module is back-to-back connected; The input terminal that B phase terminal and the described three-phase tandem type of transformer module vice-side winding isolate two B phase of H bridge module is back-to-back connected; The input terminal that C phase terminal and the described three-phase tandem type of transformer module vice-side winding isolate two C phase of H bridge module is back-to-back connected.
A phase, the B phase of the two H bridge module back-to-back of described three-phase tandem type isolation connect together with the input neutral terminal of C phase, form neutral point N
2.
The lead-out terminal of the two A phase of H bridge module back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor A phase winding, the B phase output terminals of the two H bridge module back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor B phase winding, and the C phase output terminals of the two H bridge module back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor C phase winding.
A phase, the B phase of the two H bridge module back-to-back of described three-phase tandem type isolation connect together with the output neutral terminal of C phase, form neutral point N
1.
The two H bridge module back-to-back of described three-phase tandem type isolation is divided into A phase, B phase, and C phase, often group comprises
nthe two H-bridge unit back-to-back of individual identical isolation, wherein
nfor natural number;
In the A phase of the two H bridge module back-to-back of described three-phase tandem type isolation, the two H-bridge unit input side back-to-back of each isolation comprises two input type terminals, and outlet side comprises two output type terminals;
In the A phase of the two H bridge module back-to-back of described three-phase tandem type isolation, the two H-bridge unit input side back-to-back of each isolation presses daisy chaining cascade, an input terminal and an input neutral terminal is formed after cascade, wherein input terminal is connected to the A phase terminal of described transformer, and input neutral terminal is connected to neutral point N
2;
In the A phase of the two H bridge module back-to-back of described three-phase tandem type isolation, the two H-bridge unit outlet side back-to-back of each isolation presses daisy chaining cascade, a lead-out terminal and an output neutral terminal is formed after cascade, wherein lead-out terminal is connected to AC excitation motor rotor A phase winding, exports neutral terminal and is connected to neutral point N
1;
The B phase of the two H bridge module back-to-back of described three-phase tandem type isolation, the C situation that is connected is identical with A phase.
The two H-bridge unit back-to-back of described isolation comprises two input terminals, two lead-out terminals, net side H-bridge unit, pusher side H-bridge unit and isolating transformer unit back-to-back back-to-back; Described net side is H-bridge unit, pusher side H-bridge unit and each self-contained two the input type terminals of described isolating transformer unit and two output type terminals back-to-back back-to-back;
Two input type terminals of two input terminals of the two H-bridge unit back-to-back of described isolation and described net side H-bridge unit are back-to-back connected; Described net side back-to-back two output type terminals of H-bridge unit is connected with two input type terminals of isolating transformer unit; Two input type terminals of two output type terminals of described isolating transformer unit and described pusher side H-bridge unit are back-to-back connected; Two lead-out terminals of the described pusher side two H-bridge unit back-to-back of two output type terminals and described isolation of H-bridge unit are back-to-back connected;
Described net side back-to-back H-bridge unit 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 described rectification side H bridge is connected with the inverter side direct current plus end of dc-link capacitance positive pole and described inverter side H bridge; The rectification side direct current negative terminal of described 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;
A pair rectification side H bridge ac terminal draws the input terminal of H-bridge unit back-to-back described in formation; A pair inverter side H bridge ac terminal draws the lead-out terminal of H-bridge unit back-to-back described in formation;
H-bridge unit structure is identical back-to-back H-bridge unit structure and described net side back-to-back for described pusher side.
Described isolating transformer unit comprises high-frequency isolation transformer, net side auxiliary induction and pusher side auxiliary induction.
The former limit winding of described high-frequency isolation transformer links together with the input terminal of described isolating transformer unit after connecting with described net side auxiliary induction;
The vice-side winding of described high-frequency isolation transformer links together with the lead-out terminal of described isolating transformer unit after connecting with described pusher side auxiliary induction;
Described rectification side H bridge is composed in parallel by the switch brachium pontis of two same structures.
Each described switch brachium pontis comprises two forced reversing switching devices of connecting up and down, and the emitter wherein going up switching device and the current collection of lower switching device are very connected common point, and this common point draws the ac terminal as switch brachium pontis; The direct current plus end as 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 brachium pontis; 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 is composed in parallel by the switch brachium pontis of two same structures equally, and connected mode is identical with rectification side H bridge, and two ac terminals of two switch brachium pontis are all drawn as inverter side H bridge lead-out terminal.
A kind of operation principle of high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system is as follows:
During normal work, the determining of ac excited generator grid-connected switch of testing oneself is in closure state.Described rotor side parallel switch module is in closure state.Described transformer module former limit access electrical network, secondary is then for the two H bridge module back-to-back of three-phase tandem type isolation provides three-phase operating voltage.
By controlling to make described three-phase tandem type isolate the A phase of two H bridge module back-to-back, B phase, C phase is at lead-out terminal and neutral point N
1between produce three-phase symmetrical Alternating Current Excitation voltage.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.Require that this Alternating Current Excitation voltage has suitable amplitude and phase place, to ensure that ac excited generator reaches generated output or the electric power of expectation simultaneously.
For in A phase, B phase and C phase at lead-out terminal and neutral point N
1between produce three-phase symmetrical Alternating Current Excitation voltage, the A phase of the two H bridge module back-to-back of described three-phase tandem type isolation, B phase divide into groups with C phase in the two H-bridge unit of isolating back-to-back of each isolation work as follows:
By controlling described net side H-bridge unit back-to-back, make the high frequency voltage pulse that its output duty cycle is certain.
By controlling described pusher side H-bridge unit back-to-back, make the pulse width modulated wave that its output duty cycle changes, and the fundamental voltage frequency of this pulse width modulated wave and described three-phase tandem type isolate the exciting voltage fundamental frequency that two H bridge module back-to-back exports
fequal, its fundamental voltage amplitude is then 1/ of total exciting voltage fundamental voltage amplitude that the two H bridge module back-to-back of described three-phase tandem type isolation produces
n.
The A of the two H-bridge unit back-to-back of tandem type isolation, during B, C phase is divided into groups, the fundamental voltage phase place of pulse width modulated wave that produces of H-bridge unit is identical back-to-back for each pusher side of same packets, and the fundamental voltage phase 120 degree of different grouping.
For making the two H-bridge unit of isolating back-to-back of each isolation work by described mode, each isolation is two isolate back-to-back described net side in H-bridge unit back-to-back H-bridge unit and described pusher side back-to-back H-bridge unit and described isolating transformer unit work as follows:
By controlling the conducting situation of the described net side forced reversing switching device of the bridge of rectification side H described in H-bridge unit back-to-back, the DC bus-bar voltage of described net side H-bridge unit is back-to-back stabilized on a rated value.
By controlling the conducting situation of the described net side forced reversing switching device of the bridge of inverter side H described in H-bridge unit back-to-back, make the described net side high frequency voltage pulse that H-bridge unit output duty cycle is certain back-to-back.
By controlling the conducting situation of the described pusher side forced reversing switching device of the bridge of rectification side H described in H-bridge unit back-to-back, make described pusher side back-to-back H-bridge unit input there is the high frequency voltage pulse of following feature: H-bridge unit output high voltage pulse frequency is identical back-to-back with netting side for its frequency, but differ a phase place, control this phase difference and the DC bus-bar voltage of pusher side H-bridge unit is back-to-back stabilized on a rated value.
By controlling the conducting situation of the described pusher side forced reversing switching device of the bridge of inverter side H described in H-bridge unit back-to-back, make the pulse width modulated wave of described pusher side H-bridge unit output duty cycle change back-to-back, and make its first-harmonic meet described frequency, amplitude and phase requirements.
The utility model has the advantage of:
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.
5, after adopting isolation high frequency transformer, grid side only need use common three-phase transformer, thus eliminates bulky, the Multiple coil Industrial Frequency Transformer involved great expense.
Accompanying drawing explanation
Fig. 1 is high-frequency isolation tandem type AC excitation device general illustration of the present utility model.
Fig. 2 is the single-phase composition schematic diagram of high-frequency isolation tandem type AC excitation device of the present utility model.
Fig. 3 is isolation two composition of H-bridge unit back-to-back schematic diagram of high-frequency isolation tandem type AC excitation device of the present utility model.
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 isolating transformer unit detailed schematic of specific embodiment of the utility model.
Fig. 6 is the high-frequency isolation tandem type AC excitation device schematic diagram of specific embodiment of the utility model.
In accompanying drawing: rotor side parallel switch module 1, transformer module 2, the two H bridge module 3 back-to-back of three-phase tandem type isolation, 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 transformer module 2, vice-side winding 22, A phase terminal 23, B phase terminal 24, the C phase terminal 25 of vice-side winding 22;
A phase 31, B phase 32, the C phase 33 of the two H bridge module 3 back-to-back of three-phase tandem type isolation, input terminal 34, lead-out terminal 35, input neutral terminal 36, exports neutral terminal 37, neutral point N
238, neutral point N
139, the two H-bridge unit 40 back-to-back of isolation.
A phase winding 41, B phase winding 42, the C phase winding 43 of ac excited generator 4.
Two input terminals, 44, two lead-out terminals 45 of the two H-bridge unit 3 back-to-back of isolation, net side H-bridge unit 401 back-to-back, pusher side is H-bridge unit 402 back-to-back, isolating transformer unit 403; Rectification side H bridge 404, dc-link capacitance 405, inverter side H bridge 406, rectification side direct current plus end 407, inverter side direct current plus end 408, rectification side direct current negative terminal 409, inverter side direct current negative terminal 410, rectification side H bridge ac terminal 411, inverter side H bridge ac terminal 412, high-frequency isolation transformer 413, net side auxiliary induction 414, pusher side auxiliary induction 415, switch brachium pontis 416, upper switching device 417, lower switching device 418.
Embodiment
Embodiment 1
A kind of high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system comprises the two H bridge module 3 back-to-back of rotor side parallel switch module 1, transformer module 2 and three-phase tandem type isolation; Described rotor side parallel switch module 1 is connected with transformer module 2, and described transformer module 2 and three-phase tandem type are isolated two H bridge module 3 back-to-back and be connected.
Embodiment 2
A kind of high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system comprises the two H bridge module 3 back-to-back of rotor side parallel switch module 1, transformer module 2 and three-phase tandem type isolation; Described rotor side parallel switch module 1 is connected with transformer module 2, and described transformer module 2 and three-phase tandem type are isolated two H bridge module 3 back-to-back and be 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 transformer module 2 comprises a former limit winding 21 and a vice-side winding 22; The two H bridge module 3 back-to-back of described three-phase tandem type isolation is divided into structure identical A phase 31, B phase 32 and C phase 33.
Embodiment 3
A kind of high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system comprises the two H bridge module 3 back-to-back of rotor side parallel switch module 1, transformer module 2 and three-phase tandem type isolation; Described rotor side parallel switch module 1 is connected with transformer module 2, and described transformer module 2 and three-phase tandem type are isolated two H bridge module 3 back-to-back and be 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 transformer module 2 comprises a former limit winding 21 and a vice-side winding 22; The two H bridge module 3 back-to-back of described three-phase tandem type isolation is divided into structure identical A phase 31, B phase 32 and C phase 33.
The A phase 31 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation comprises an input terminal 34, input neutral terminal 36, lead-out terminal 35 and an output neutral terminal 37; The B phase 32 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation is all identical with A phase 31 structure with C phase 33.
The three-phase input side terminal 11 of described 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 described transformer module 2.
The former limit winding 21 of described transformer module 2 is connected with described rotor side parallel switch module 1, and the input terminal 34 that A phase terminal 23 and the described three-phase tandem type of the vice-side winding 22 of transformer module 2 isolate two A phase 31 of H bridge module 3 is back-to-back connected; The input terminal 34 that B phase terminal 24 and the described three-phase tandem type of the vice-side winding 22 of transformer module 2 isolate two B phase 32 of H bridge module 3 is back-to-back connected; The input terminal 34 that C phase terminal 25 and the described three-phase tandem type of the vice-side winding 22 of transformer module 2 isolate two C phase 33 of H bridge module 3 is back-to-back connected.
A phase 31, the B phase 32 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation connect together with the input neutral terminal 36 of C phase 33, form neutral point N
238.
The lead-out terminal 35 of the two A phase 31 of H bridge module 3 back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor A phase winding 41, B phase 32 lead-out terminal 35 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor B phase winding 42, and C phase 33 lead-out terminal 35 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor C phase winding 43.
A phase 31, the B phase 32 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation connect together with the output neutral terminal 37 of C phase 33, form neutral point N
139.
Embodiment 3
A kind of high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system comprises the two H bridge module 3 back-to-back of rotor side parallel switch module 1, transformer module 2 and three-phase tandem type isolation; Described rotor side parallel switch module 1 is connected with transformer module 2, and described transformer module 2 and three-phase tandem type are isolated two H bridge module 3 back-to-back and be 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 transformer module 2 comprises a former limit winding 21 and a vice-side winding 22; The two H bridge module 3 back-to-back of described three-phase tandem type isolation is divided into structure identical A phase 31, B phase 32 and C phase 33.
The A phase 31 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation comprises an input terminal 34, input neutral terminal 36, lead-out terminal 35 and an output neutral terminal 37; The B phase 32 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation is all identical with A phase 31 structure with C phase 33.
The three-phase input side terminal 11 of described 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 described transformer module 2.
The former limit winding 21 of described transformer module 2 is connected with described rotor side parallel switch module 1, and the input terminal 34 that A phase terminal 23 and the described three-phase tandem type of the vice-side winding 22 of transformer module 2 isolate two A phase 31 of H bridge module 3 is back-to-back connected; The input terminal 34 that B phase terminal 24 and the described three-phase tandem type of the vice-side winding 22 of transformer module 2 isolate two B phase 32 of H bridge module 3 is back-to-back connected; The input terminal 34 that C phase terminal 25 and the described three-phase tandem type of the vice-side winding 22 of transformer module 2 isolate two C phase 33 of H bridge module 3 is back-to-back connected.
A phase 31, the B phase 32 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation connect together with the input neutral terminal 36 of C phase 33, form neutral point N
238.The lead-out terminal 35 of the two A phase 31 of H bridge module 3 back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor A phase winding 41, B phase 32 lead-out terminal 35 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor B phase winding 42, and C phase 33 lead-out terminal 35 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor C phase winding 43.A phase 31, the B phase 32 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation connect together with the output neutral terminal 37 of C phase 33, form neutral point N
139.
The two H bridge module 3 back-to-back of three-phase tandem type isolation is divided into A phase 31, B phase 32, C phase 33, and often group comprises
nthe two H-bridge unit 40 back-to-back of individual identical isolation, wherein
nfor natural number; In the A phase 31 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation, two H-bridge unit 40 input side back-to-back of each isolation comprises two input type terminals, and outlet side comprises two output type terminals; In the A phase 31 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation, two H-bridge unit 40 input side back-to-back of each isolation presses daisy chaining cascade, an input terminal 34 and an input neutral terminal 36 is formed after cascade, wherein input terminal 34 is connected to the A phase terminal 23 of described transformer, and input neutral terminal 36 is connected to neutral point N
238; In the A phase 31 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation, two H-bridge unit 40 outlet side back-to-back of each isolation presses daisy chaining cascade, a lead-out terminal 35 and an output neutral terminal 37 is formed after cascade, wherein lead-out terminal 35 is connected to AC excitation motor rotor A phase winding 41, exports neutral terminal 37 and is connected to neutral point N
139; B phase 32, C phase 33 connection of the two H bridge module 3 back-to-back of described three-phase tandem type isolation are identical with A phase 31.
The two H-bridge unit 40 back-to-back of isolation comprises two input terminals, 44, two lead-out terminals 45, net side H-bridge unit 401, pusher side H-bridge unit 402 and isolating transformer unit 403 back-to-back back-to-back; Described net side is H-bridge unit 401, pusher side H-bridge unit 402 and each self-contained two the input type terminals of described isolating transformer unit 403 and two output type terminals back-to-back back-to-back;
Two input type terminals of two input terminals 44 of the two H-bridge unit 40 back-to-back of described isolation and described net side H-bridge unit 401 are back-to-back connected; Described net side back-to-back two output type terminals of H-bridge unit 401 is connected with two input type terminals of isolating transformer unit 403; Two input type terminals of two output type terminals of described isolating transformer unit 403 and pusher side H-bridge unit 402 are back-to-back connected; Two lead-out terminals 45 of the described pusher side two H-bridge unit 40 back-to-back of two output type terminals and described isolation of H-bridge unit 402 are back-to-back connected;
Described net side back-to-back H-bridge unit 401 comprises rectification side H bridge 404, dc-link capacitance 405 and inverter side H bridge 406, forms back to back structure in parallel; The rectification side direct current plus end 407 of described rectification side H bridge 404 is connected with the inverter side direct current plus end 408 of dc-link capacitance 405 positive pole and described inverter side H bridge 406; The rectification side direct current negative terminal 409 of described rectification side H bridge 404 is connected with the inverter side direct current negative terminal 410 of dc-link capacitance 405 negative pole and described inverter side H bridge 406; A pair rectification side H bridge ac terminal 411 draws the input type terminal forming described net side H-bridge unit 401 back-to-back; A pair inverter side H bridge ac terminal 412 draws the output type terminal forming described net side H-bridge unit 401 back-to-back; H-bridge unit 401 structure is identical back-to-back H-bridge unit 402 structure and described net side back-to-back for described pusher side.
Isolating transformer unit 403 comprises high-frequency isolation transformer 413, net side auxiliary induction 414 and pusher side auxiliary induction 415.
The former limit winding of high-frequency isolation transformer 413 is connected together with two input type connecting terminals of described isolating transformer unit 403 after connecting with described net side auxiliary induction 414; The vice-side winding of high-frequency isolation transformer 413 is connected together with two output type connecting terminals of described isolating transformer unit 403 after connecting with described pusher side auxiliary induction 415.
Described rectification side H bridge 404 is composed in parallel by the switch brachium pontis 416 of two same structures.
Each described switch brachium pontis 416 comprises two forced reversing switching devices of connecting up and down, and the emitter wherein going up switching device 417 and the current collection of lower switching device 418 are very connected common point, and this common point draws the ac terminal as switch brachium pontis 416; The direct current plus end as brachium pontis drawn by the collector electrode of upper switching device 417, and the emitter of lower switching device 418 draws the direct current negative terminal as brachium pontis; The direct current plus end of two switch brachium pontis 416 connects together, and direct current negative terminal also connects together; Two ac terminals of two switch brachium pontis 416 are all drawn as rectification side H bridge 404 input terminal 411.
Described inverter side H bridge 406 is composed in parallel by the switch brachium pontis 416 of two same structures equally, and connected mode is identical with rectification side H bridge 404, and two ac terminals of two switch brachium pontis 416 are all drawn as inverter side H bridge 406 lead-out terminal 412.
A kind of operation principle of high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system is as follows:
During normal work, the determining of ac excited generator 4 grid-connected switch of testing oneself is in closure state.Described rotor side parallel switch module 1 is in closure state.Described transformer module 2 former limit access electrical network, secondary is then for the two H bridge module 3 back-to-back of three-phase tandem type isolation provides three-phase operating voltage.
By controlling to make described three-phase tandem type isolate A phase 31, B phase 32, the C phase 33 of two H bridge module 3 back-to-back at lead-out terminal 35 and neutral point N
1three-phase symmetrical Alternating Current Excitation voltage is produced between 39.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 and phase place, to ensure that ac excited generator 4 reaches generated output or the electric power of expectation simultaneously.
For in A phase 31, B phase 32 and C phase 33 at lead-out terminal 35 and neutral point N
1produce three-phase symmetrical Alternating Current Excitation voltage between 39, A phase 31 of the two H bridge module 3 back-to-back of described three-phase tandem type isolation, B phase 32 and C phase 33 divide into groups in each isolate pair back-to-back isolation H-bridge unit and work as follows:
By controlling described net side H-bridge unit 401 back-to-back, make the high frequency voltage pulse that its output duty cycle is certain.
By controlling described pusher side H-bridge unit 402 back-to-back, make the pulse width modulated wave that its output duty cycle changes, and the fundamental voltage frequency of this pulse width modulated wave and described three-phase tandem type isolate the exciting voltage fundamental frequency that two H bridge module 3 back-to-back exports
fequal, its fundamental voltage amplitude is then 1/ of total exciting voltage fundamental voltage amplitude that the two H bridge module 3 back-to-back of described three-phase tandem type isolation produces
n.
During A phase 31, B phase 32, the C phase 33 of the two H-bridge unit 40 back-to-back of tandem type isolation is divided into groups, the fundamental voltage phase place of each pusher side of same packets pulse width modulated wave of H-bridge unit 402 generation is back-to-back identical, and the fundamental voltage phase 120 degree of different grouping.
For making the two H-bridge unit of isolating back-to-back of each isolation work by described mode, each isolation is two isolate back-to-back described net side in H-bridge unit back-to-back H-bridge unit 401 and described pusher side back-to-back H-bridge unit 402 and described isolating transformer unit 403 work as follows:
By controlling the conducting situation of the described net side forced reversing switching device of rectification side H bridge 404 described in H-bridge unit 401 back-to-back, the DC bus-bar voltage of described net side H-bridge unit 401 is back-to-back stabilized on a rated value.
By controlling the conducting situation of the described net side forced reversing switching device of inverter side H bridge 406 described in H-bridge unit 401 back-to-back, make the described net side high frequency voltage pulse that H-bridge unit 401 output duty cycle is certain back-to-back.
By controlling the conducting situation of the described pusher side forced reversing switching device of rectification side H bridge 404 described in H-bridge unit 402 back-to-back, make described pusher side back-to-back H-bridge unit 402 input there is the high frequency voltage pulse of following feature: H-bridge unit 401 output high voltage pulse frequency is identical back-to-back with netting side for its frequency, but differ a phase place, control this phase difference and the DC bus-bar voltage of pusher side H-bridge unit 402 is back-to-back stabilized on a rated value.
By controlling the conducting situation of the described pusher side forced reversing switching device of inverter side H bridge 406 described in H-bridge unit 402 back-to-back, make the pulse width modulated wave of described pusher side H-bridge unit 402 output duty cycle change back-to-back, and make its first-harmonic meet described frequency, amplitude and phase requirements.
The utility model has converting operation ability, can meet the excitation requirement that pumped storage machine runs variable-speed operation.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.There is cascade characteristic, when avoiding the access realizing AC excitation current transformer voltage levels when using special high-voltage semiconductor switching device.There is modular nature, after expansion can after be applicable to the ac excited generator 4 of multiple voltage grade.After adopting isolation high frequency transformer, grid side only need use common three-phase transformer, thus eliminates bulky, the Multiple coil Industrial Frequency Transformer involved great expense.
Embodiment 4
Fig. 6 is a specific embodiment of the present utility model, and the high-frequency isolation cascade AC excitation device embodiment of this variable-ratio pumped storage system is as follows:
1. this is used for the tandem type AC excitation device of variable-ratio pumped storage system, comprises the two H bridge module 3 back-to-back of rotor side parallel switch module 1, transformer module 2 and three-phase tandem type isolation.Pump turbine 6 is connected with ac excited generator 4.
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) transformer module 2 is made up of a former limit winding 21 and a vice-side winding 22.
C) the two H bridge module 3 back-to-back of three-phase tandem type isolation is divided into structure identical A phase 31, B phase 32 and C phase 33.
D) the A phase 31 of the two H bridge module 3 back-to-back of three-phase tandem type isolation comprises
oneindividual input terminal 34, one input neutral terminal 36 and a lead-out terminal 35, export neutral terminal 37.B phase 32 and C phase 33 situation of the two H bridge module 3 back-to-back of three-phase tandem type isolation are 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 transformer module 2.
F) the former limit winding 21 of transformer module 2 is connected with rotor side parallel switch module 1, and the input terminal 34 that A phase terminal 23 and the three-phase tandem type of the vice-side winding 22 of transformer module 2 isolate two A phase 31 of H bridge module 3 is back-to-back connected.The input terminal 34 that B phase terminal 24 and the three-phase tandem type of the vice-side winding 22 of transformer module 2 isolate two B phase 32 of H bridge module 3 is back-to-back connected.C phase 33 connection of the vice-side winding 22 of transformer module 2 and A phase 31, B phase 32 are similar.
G) A phase 31 of the two H bridge module 3 back-to-back of three-phase tandem type isolation, B phase 32 connect together with the input neutral terminal 36 of C phase 33, formation neutral point N
238.
H) lead-out terminal 35 of the two A phase 31 of H bridge module 3 back-to-back of three-phase tandem type isolation is connected to AC excitation motor rotor A phase winding 41, B phase 32 lead-out terminal 35 of the two H bridge module 3 back-to-back of three-phase tandem type isolation is connected to AC excitation motor rotor B phase winding 42, and three-phase tandem type isolation pair back-to-back C phase 33 connection and the A phase 31 of H bridge module 3, B phase 32 is similar.
I) A phase 31 of the two H bridge module 3 back-to-back of three-phase tandem type isolation, B phase 32 connect together with the output neutral terminal 37 of C phase 33, formation neutral point N
139.
2. the two H bridge module 3 back-to-back of three-phase tandem type isolation is divided into A phase 31, B phase 32, C phase 33 3 groups, and often group comprises 5 identical isolation pair back-to-back H-bridge unit 40.
A) three-phase tandem type is isolated two H-bridge unit 40 input side back-to-back of each isolation in the A phase 31 of two H bridge module 3 back-to-back and is comprised two input type terminals, and outlet side comprises two output type terminals;
In A phase 31 of b) the two H bridge module 3 back-to-back of three-phase tandem type isolation each isolation pair back-to-back H-bridge unit 40 input side press daisy chaining cascade, an input terminal 34 and an input neutral terminal 36 is formed after cascade, wherein input terminal 34 is connected to the A phase terminal 23 of transformer, and input neutral terminal 36 is connected to neutral point N
238.
In A phase 31 of c) the two H bridge module 3 back-to-back of three-phase tandem type isolation each isolation pair back-to-back H-bridge unit 40 outlet side press daisy chaining cascade, a lead-out terminal 35 and an output neutral terminal 37 is formed after cascade, wherein lead-out terminal 35 is connected to AC excitation motor rotor A phase winding 41, exports neutral terminal 37 and is connected to neutral point N
139.
D) B, C phase 33 connection of the two H bridge module 3 back-to-back of three-phase tandem type isolation is similar with A phase 31.
3. pair back-to-back H bridge module by two input terminals, 44, two lead-out terminals 45, net side back-to-back H-bridge unit 401, pusher side H-bridge unit 402 and isolating transformer unit 403 form back-to-back.
A) net side H-bridge unit 401 back-to-back, pusher side is H-bridge unit 402 back-to-back, and isolating transformer unit 403, each self-contained two input type terminals and two output type terminals;
B) two input type terminals of two input terminals 44 and the net side of the two H-bridge unit 40 back-to-back of isolation H-bridge unit 401 are back-to-back connected;
C) net side back-to-back two output type terminals of H-bridge unit 401 be connected with two input type terminals of isolating transformer unit 403;
D) two input type terminals of two output type terminals and the pusher side of isolating transformer unit 403 H-bridge unit 402 are back-to-back connected;
E) two output type terminals of pusher side H-bridge unit 402 are back-to-back connected with two lead-out terminals 45 of the two H-bridge unit 40 back-to-back of isolation;
4. net side back-to-back H-bridge unit 401 be made up of rectification side H bridge 404, dc-link capacitance 405 and inverter side H bridge 406, form back to back structure in parallel.
A) the rectification side direct current plus end 407 of rectification side H bridge 404 is connected with the inverter side direct current plus end 408 of dc-link capacitance 405 positive pole and inverter side H bridge 406.The rectification side direct current negative terminal 409 of rectification side H bridge 404 is connected with the inverter side direct current negative terminal 410 of dc-link capacitance 405 negative pole and inverter side H bridge 406.
B) a pair ac terminal of rectification side H bridge 404 draws the input terminal forming net side H-bridge unit 401 back-to-back; A pair ac terminal of inverter side H bridge 406 draws the lead-out terminal forming net side H-bridge unit 401 back-to-back.
5. pusher side back-to-back H-bridge unit 402 structure and net H-bridge unit 401 structure is identical back-to-back in side.
6. isolating transformer unit 403 is made up of high-frequency isolation transformer 413 and net side auxiliary induction 414 and pusher side auxiliary induction 415.
A), after the former limit winding of high-frequency isolation transformer 413 is connected with described net side auxiliary induction 414, be connected together with two input type connecting terminals of described isolating transformer unit 403;
B), after the vice-side winding of high-frequency isolation transformer 413 is connected with described pusher side auxiliary induction 415, be connected together with two output type connecting terminals of described isolating transformer unit 403;
7. rectification side H bridge 404 is composed in parallel by the switch brachium pontis 416 of two same structures.
A) each switch brachium pontis 416 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 416.
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 416 connects together, and direct current negative terminal also connects together.
C) two ac terminals of two switch brachium pontis 416 are all drawn as rectification side H bridge 404 input terminal 411.
8. inverter side H bridge 406 is composed in parallel by the switch brachium pontis 416 of two same structures equally, and connected mode is identical with rectifier bridge.Two ac terminals of two switch brachium pontis 416 are all drawn as inverter side H bridge 406 lead-out terminal 412.
9. the high-frequency isolation cascade AC excitation device of this variable-ratio pumped storage system, works in such a way:
When a) normally working, the determining of ac excited generator 4 grid-connected switch of testing oneself is in closure state.Rotor side parallel switch module 1 is in closure state.Transformer module 2 former limit access electrical network, secondary is then for the two H bridge module 3 back-to-back of three-phase tandem type isolation provides three-phase operating voltage.
B) by controlling to make three-phase tandem type isolate A phase 31, B phase 32, the C phase 33 of two H bridge module 3 back-to-back at lead-out terminal 35 and neutral point N
1three-phase symmetrical Alternating Current Excitation voltage is produced between 39.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 and phase place, to ensure that ac excited generator 4 reaches generated output or the electric power of expectation simultaneously.
10. be at lead-out terminal 35 and neutral point N in A phase 31, B phase 32, C phase 33
1produce three-phase symmetrical Alternating Current Excitation voltage between 39, the two H-bridge unit of isolating back-to-back of each isolation in A phase 31, B phase 32, C phase 33 grouping of the two H bridge module 3 back-to-back of three-phase tandem type isolation works as follows:
A) by Controling network side H-bridge unit 401 back-to-back, the high frequency voltage pulse that its output duty cycle is certain is made.
B) by controlling pusher side H-bridge unit 402 back-to-back, make the pulse width modulated wave that its output duty cycle changes, and the fundamental voltage frequency of this pulse width modulated wave and three-phase tandem type isolate the exciting voltage fundamental frequency that two H bridge module 3 back-to-back exports
fequal, its fundamental voltage amplitude is then for three-phase tandem type isolates 1/5 of total exciting voltage fundamental voltage amplitude that two H bridge module 3 back-to-back produces.
C) the A phase 31 of the two H-bridge unit 40 back-to-back of tandem type isolation, B phase 32, during C phase 33 is divided into groups, the fundamental voltage phase place of pulse width modulated wave that produces of H-bridge unit 402 is identical back-to-back for each pusher side of same packets, and the fundamental voltage phase 120 degree of different grouping.
11. work by mode for making the two H-bridge unit of isolating back-to-back of each isolation, each isolation is two isolate back-to-back net side in H-bridge unit back-to-back H-bridge unit 401 and pusher side back-to-back H-bridge unit 402 and isolating transformer unit 403 work as follows:
A) by the conducting situation of the forced reversing switching device of rectification side H bridge 404 in Controling network side back-to-back H-bridge unit 401, the DC bus-bar voltage of netting side H-bridge unit 401 is back-to-back stabilized on a rated value.
B) by the conducting situation of the forced reversing switching device of inverter side H bridge 406 in Controling network side back-to-back H-bridge unit 401, the net side high frequency voltage pulse that H-bridge unit 401 output duty cycle is certain is back-to-back made.
C) by the conducting situation of the forced reversing switching device of rectification side H bridge 404 in control pusher side back-to-back H-bridge unit 402, make pusher side back-to-back H-bridge unit 402 input there is the high frequency voltage pulse of following feature: H-bridge unit 401 output high voltage pulse frequency is identical back-to-back with netting side for its frequency, but differ a phase place, control this phase difference and the DC bus-bar voltage of pusher side H-bridge unit 402 is back-to-back stabilized on a rated value.
D) by the conducting situation of the forced reversing switching device of inverter side H bridge 406 in control pusher side back-to-back H-bridge unit 402, make the pulse width modulated wave of pusher side H-bridge unit 402 output duty cycle change back-to-back, and make its first-harmonic meet frequency, amplitude and phase requirements.
Claims (8)
1. the high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system, is characterized in that: comprise the two H bridge module (3) back-to-back of rotor side parallel switch module (1), transformer module (2) and three-phase tandem type isolation; Described rotor side parallel switch module (1) is connected with transformer module (2), and described transformer module (2) and three-phase tandem type are isolated two H bridge module (3) back-to-back and be connected.
2. the high-frequency isolation cascade AC excitation device of 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 transformer module (2) comprises former limit winding (21) and a vice-side winding (22); The two H bridge module (3) back-to-back of described three-phase tandem type isolation is divided into structure identical A phase (31), B phase (32) and C phase (33).
3. the high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system according to claim 2, it is characterized in that: the A phase (31) of the two H bridge module (3) back-to-back of described three-phase tandem type isolation comprises an input terminal (34), input neutral terminal (36), a lead-out terminal (35) and output neutral terminal (37); The B phase (32) of the two H bridge module (3) back-to-back of described three-phase tandem type isolation is all identical with A phase (31) structure with C phase (33); The three-phase input side terminal (11) of described rotor side parallel switch module (1) is connected with three phase network (5), and three-phase outlet side terminal (12) is connected with former limit winding (21) of described transformer module (2); Former limit winding (21) of described transformer module (2) is connected with described rotor side parallel switch module (1), and the input terminal (34) that A phase terminal (23) and the described three-phase tandem type of the vice-side winding (22) of transformer module (2) isolate two A phase (31) of H bridge module (3) is back-to-back connected; The input terminal (34) that A phase terminal (24) and the described three-phase tandem type of the vice-side winding (22) of transformer module (2) isolate two B phase (32) of H bridge module (3) is back-to-back connected; The input terminal (34) that A phase terminal (25) and the described three-phase tandem type of the vice-side winding (22) of transformer module (2) isolate two C phase (33) of H bridge module (3) is back-to-back connected; A phase (31), the B phase (32) of the two H bridge module (3) back-to-back of described three-phase tandem type isolation connect together with the input neutral terminal (36) of C phase (33), form neutral point N
2(38); The lead-out terminal (35) of the two A phase (31) of H bridge module (3) back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor A phase winding (41), B phase (32) lead-out terminal (35) of the two H bridge module (3) back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor B phase winding (42), and C phase (33) lead-out terminal (35) of the two H bridge module (3) back-to-back of described three-phase tandem type isolation is connected to AC excitation motor rotor C phase winding (43); A phase (31), the B phase (32) of the two H bridge module (3) back-to-back of described three-phase tandem type isolation connect together with the output neutral terminal (37) of C phase (33), form neutral point N
1(39).
4. the high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system according to claim 3, it is characterized in that: the two H bridge module (3) back-to-back of described three-phase tandem type isolation is divided into A phase (31), B phase (32), C phase (33), often group comprises
nthe two H-bridge unit (40) back-to-back of individual identical isolation, wherein
nfor natural number; In the A phase (31) of the two H bridge module (3) back-to-back of described three-phase tandem type isolation, two H-bridge unit (40) input side back-to-back of each isolation comprises two input type terminals, and outlet side comprises two output type terminals; In the A phase (31) of the two H bridge module (3) back-to-back of described three-phase tandem type isolation, two H-bridge unit (40) input side back-to-back of each isolation presses daisy chaining cascade, an input terminal (34) and input neutral terminal (36) is formed after cascade, wherein input terminal (34) is connected to the A phase terminal (23) of described transformer, and input neutral terminal (36) is connected to neutral point N
2(38); In the A phase (31) of the two H bridge module (3) back-to-back of described three-phase tandem type isolation, two H-bridge unit (40) outlet side back-to-back of each isolation presses daisy chaining cascade, a lead-out terminal (35) and output neutral terminal (37) is formed after cascade, wherein lead-out terminal (35) is connected to AC excitation motor rotor A phase winding (41), exports neutral terminal (37) and is connected to neutral point N
1(39); B phase (32), C phase (33) connection of the two H bridge module (3) back-to-back of described three-phase tandem type isolation are identical with A phase (31).
5. the high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system according to claim 4, is characterized in that: the two H-bridge unit (40) back-to-back of described isolation comprises two input terminals (44), two lead-out terminals (45), net side H-bridge unit (401), pusher side H-bridge unit (402) and isolating transformer unit (403) back-to-back back-to-back; Described net side is H-bridge unit (401), pusher side H-bridge unit (402) and each self-contained two the input type terminals of described isolating transformer unit (403) and two output type terminals back-to-back back-to-back; Two input type terminals of two input terminals (44) of the two H-bridge unit (40) back-to-back of described isolation and described net side H-bridge unit (401) are back-to-back connected; Described net side back-to-back two output type terminals of H-bridge unit (401) is connected with two input type terminals of isolating transformer unit (403); Two input type terminals of two output type terminals of described isolating transformer unit (403) and pusher side H-bridge unit (402) are back-to-back connected; Two lead-out terminals (45) of the described pusher side two H-bridge unit (40) back-to-back of two output type terminals and described isolation of H-bridge unit (402) are back-to-back connected.
6. the high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system according to claim 5, it is characterized in that: described net side back-to-back H-bridge unit (401) comprises rectification side H bridge (404), dc-link capacitance (405) and inverter side H bridge (406), forms back to back structure in parallel; The rectification side direct current plus end (407) of described rectification side H bridge (404) is connected with the inverter side direct current plus end (408) of dc-link capacitance (405) positive pole and described inverter side H bridge (406); The rectification side direct current negative terminal (409) of described rectification side H bridge (404) is connected with the inverter side direct current negative terminal (410) of dc-link capacitance (405) negative pole and described inverter side H bridge (406); The extraction of a pair rectification side H bridge ac terminal (411) forms the input terminal of described net side H-bridge unit (401) back-to-back; The extraction of a pair inverter side H bridge ac terminal (412) forms the lead-out terminal of described net side H-bridge unit (401) back-to-back; H-bridge unit (401) structure is identical back-to-back H-bridge unit (402) structure and described net side back-to-back for described pusher side.
7. the high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system according to claim 6, is characterized in that: described isolating transformer unit (403) comprises high-frequency isolation transformer (413), net side auxiliary induction (414) and pusher side auxiliary induction (415); The former limit winding of described high-frequency isolation transformer (413) is connected together with two input type connecting terminals of described isolating transformer unit (403) after connecting with described net side auxiliary induction (414); The vice-side winding of described high-frequency isolation transformer (413) links together with two lead-out terminals of described isolating transformer unit (403) after connecting with described pusher side auxiliary induction (415).
8. the high-frequency isolation cascade AC excitation device of variable-ratio pumped storage system according to claim 7, is characterized in that: described rectification side H bridge (404) is composed in parallel by the switch brachium pontis (416) of two same structures; Each described switch brachium pontis (416) comprises two forced reversing switching devices of connecting up and down, the emitter wherein going up switching device (417) and the current collection of lower switching device (418) are very connected common point, and this common point draws the ac terminal as switch brachium pontis (416); The direct current plus end as brachium pontis drawn by the collector electrode of upper switching device (417), and the emitter of lower switching device (418) draws the direct current negative terminal as brachium pontis; The direct current plus end of two switch brachium pontis (416) connects together, and direct current negative terminal also connects together; Two ac terminals of two switch brachium pontis (416) are all drawn as rectification side H bridge (404) input terminal (411); Described inverter side H bridge (406) is composed in parallel by the switch brachium pontis (416) of two same structures equally, connected mode is identical with rectification side H bridge (404), and two ac terminals of two switch brachium pontis (416) are all drawn as inverter side H bridge (406) lead-out terminal (412).
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Effective date of registration: 20180428 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 |