CN201937280U - Power generation grid-connected topological structure of transformerless hydraulic generator - Google Patents
Power generation grid-connected topological structure of transformerless hydraulic generator Download PDFInfo
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- CN201937280U CN201937280U CN201020267918XU CN201020267918U CN201937280U CN 201937280 U CN201937280 U CN 201937280U CN 201020267918X U CN201020267918X U CN 201020267918XU CN 201020267918 U CN201020267918 U CN 201020267918U CN 201937280 U CN201937280 U CN 201937280U
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Abstract
The utility model relates to a power generation grid-connected topological structure of a transformerless hydraulic generator, comprising a hydraulic generator set, a high voltage rectifying topology, a DC bus and an inverter topology, wherein the high voltage rectifying topology comprises a plurality of high voltage rectifying modules, and the inverter topology comprises a plurality of inverter modules; and high voltage AC power of any frequency generated by each hydraulic generator is rectified by the high voltage rectifying topology to obtain DC high voltage power, the generated DC high voltage is connected together to be converged on the DC bus, the voltage on the DC bus is used as the DC side voltage of the inverter topology, the DC side voltage is inverted into AC voltage by the inverter topology, and then high voltage is generated and connected into a power grid. The power generation grid-connected topological structure has the advantages of saving equipment investment due to no transformer at the input end and greatly improving the hydraulic generation efficiency; as no transformer is arranged at the input end, the volume of the hydraulic power generation grid-connected topology is reduced, the occupied area is reduced, the weight is lightened and the cost is lowered; and simultaneously, the energy consumption is reduced, the manufacture process is simplified, and the production period is shortened.
Description
Technical field
The utility model relates to hydraulic generator electricity generation grid-connecting and high-power electric and electronic technology, particularly a kind of transless hydroelectric power generation based on MMC modular multilevel inverter (Modular Multilevel Converter) and H bridge new topological structure that is incorporated into the power networks.
Background technology
China's hydropower resources rank the first in the world, and the hydraulic generator in all up to now hydroelectric stations all adopts with a kind of mode and adopts electricity, and the electricity that the hydraulic turbine sends can not directly be connected to the grid, and has only the rotating speed of regulating the hydraulic turbine, make electricity that the hydraulic turbine sends in the 50Hz power frequency, just can be connected to the grid.In order to control the rotating speed of the hydraulic turbine, the unnecessary water of will draining, this generation mode causes huge waste.The water yield is big when the wet season, originally can send out electricity more, but because the restriction of hydraulic turbine 50Hz power frequency, unnecessary water can effectively change into electric energy, slatterning in vain.The water yield is little during dry season, can cause the rotating speed of the hydraulic turbine can not get at 50Hz, and do not send out electricity this moment, again can waste water resource.
In addition, usually hydroelectric power generation needs input side all to dispose transformer, make equipment investment big, take up an area of many, the cost height, the production cycle is long.
The utility model content
The purpose of this utility model provides a kind of transless hydraulic generator electricity generation grid-connecting topological structure, this structure input transless, and by high-voltage rectifying, dc bus passes through the units in series inversion module again with the direct voltage inversion, and the output high pressure is connected to the grid; Save equipment investment, improved hydroelectric power generation efficient greatly.The input transless reduces hydroelectric power generation and net topology volume, takes up an area of to reduce, and weight saving, cost reduces; Can cut down the consumption of energy simultaneously, manufacturing process is oversimplified, the production cycle reduces.
For achieving the above object, the utility model is achieved through the following technical solutions:
A kind of transless hydraulic generator electricity generation grid-connecting topological structure, this topological structure comprises the hydraulic generator unit, the high-voltage rectifying topology that constitutes by a plurality of high-voltage rectifying modules, dc bus, the inversion topological that constitutes by a plurality of inversion modules, the High Level AC Voltage of the optional frequency that each hydraulic generator produces, after the rectification of high-voltage rectifying topology, obtain high direct voltage, the high direct voltage that produces links together and collects on the dc bus, voltage on the dc bus is as the dc voltage of inversion topological, dc voltage produces high pressure and is connected to the grid after the inversion topological inversion is alternating voltage.
Described high-voltage rectifying module is formed three-phase commutation bridge output by uncontrollable or controlled power electronic device; Direct voltage after each generating set rectification is identical, is connected to dc bus.
Described high-voltage rectifying topology, inversion topological are three-phase, are whenever formed by even number n sub-units in series, are divided into two groups up and down, and every group of subelement number is n/2, and output phase voltage level number is n/2+1, and line voltage level number is n+1; The input of the every phase of rectification topology is the midpoint of two groups of subelements, and between input and the every group of subelement to be coupled or non-coupling inductance is connected; The output of inversion topological is the midpoint of two groups of subelements, and is connected with coupling or non-coupling inductance between output and the every group of subelement.
Described subelement is a half-bridge structure, is made up of switching device IGBT1 and IGBT2 and dc bus capacitor C, and switching device IGBT1 and IGBT2 are in series, and IGBT1 of parallel connection direct capacitor C, and switching device again and IGBT2 be inverse parallel diode D1, D2 respectively; The common port of IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other subelement as the output of each subelement.
Described subelement is the H bridge construction, forms by four IGBT switching devices, and diode of each IGBT switching device inverse parallel, after per two IGBT switching devices are in series, in parallel with dc capacitor C again.
Described high-voltage rectifying topology is the uncontrollable structure that a plurality of diode series connection constitute; Inversion topological is a three-phase, and inversion module is every to be formed by even number n sub-units in series, is divided into two groups up and down, and every group of subelement number is n/2, and output phase voltage level number is n/2+1, and line voltage level number is n+1; The output of inversion module is the midpoint of two groups of subelements, and is connected with coupling or non-coupling inductance between output and the every group of subelement.
Described inversion topological subelement is a half-bridge structure, form by switching device IGBT1 and IGBT2 and dc bus capacitor C, switching device IGBT1 and IGBT2 are in series, and IGBT1 of parallel connection direct capacitor C, and switching device again and IGBT2 be inverse parallel diode D1, D2 respectively; The common port of IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other subelement as the output of each subelement.
Described inversion topological subelement is the H bridge construction, forms by four IGBT switching devices, and diode of each IGBT switching device inverse parallel, after per two IGBT switching devices are in series, in parallel with dc capacitor C again.
The high direct voltage that a plurality of hydraulic generator units produce can be connected on the dc bus, directly export high direct voltage.
Compared with prior art, the beneficial effects of the utility model are:
1) electricity that the hydraulic turbine of any rotating speed can be sent is transformed into the 50Hz high-quality alternating current that can directly be incorporated into the power networks, and can improve natural flow station efficient more than 30%;
2) input transless, and then hydroelectric power generation and net topology volume are reduced, take up an area of and reduce, weight saving, cost reduces; Simultaneously can reduce transformer energy consumption, manufacturing process is oversimplified, the production cycle reduces;
3) hydraulic generator is directly connected to the rectification side, and hydraulic generator is not had specific (special) requirements, reduces motor cost;
4) rectification side adopts the high pressure controlled rectification, can directly produce high voltage direct current by High Level AC Voltage;
5) modulator approach adopts the method for phase-shifting carrier wave, can produce the multi-ladder sine wave, obtains output voltage waveforms preferably with less switching frequency;
6) can be connected into ac high-voltage to whole hydropower station, directly export from AC side;
7) can be connected into high direct voltage to whole hydropower station, directly export from DC side;
8) high-power, the applications prospect of many water wheels unit is extensive.
Description of drawings
Fig. 1 is a transless hydraulic generator electricity generation grid-connecting topological structure schematic diagram;
Fig. 2 is the high-voltage rectifying topology diagram of half-bridge structure;
Fig. 3 is the inversion topological structure chart of half-bridge structure;
Fig. 4 is the high-voltage rectifying topology diagram of H bridge construction;
Fig. 5 is the inversion topological structure chart of H bridge construction;
Fig. 6 is the high-voltage rectifying topology diagram of the uncontrollable structure of diode composition;
Current direction figure in Fig. 7-1, Fig. 7-2, Fig. 7-3, Fig. 7 the-the 4th, semibridge system power cell;
Current direction figure in Fig. 8-1, Fig. 8-2, Fig. 8-3, Fig. 8 the-the 4th, H bridge-type power cell.
Embodiment
See Fig. 1, a kind of transless hydraulic generator electricity generation grid-connecting topological structure, this topological structure comprises the hydraulic generator unit, the high-voltage rectifying topology that constitutes by a plurality of high-voltage rectifying modules, dc bus, the inversion topological that constitutes by a plurality of inversion modules, the High Level AC Voltage of the optional frequency that each hydraulic generator produces, after the rectification of high-voltage rectifying topology, obtain high direct voltage, the high direct voltage that produces links together and collects on the dc bus, voltage on the dc bus is as the dc voltage of inversion topological, dc voltage produces high pressure and is connected to the grid after the inversion topological inversion is alternating voltage.
The high-voltage rectifying module is formed three-phase commutation bridge output by controlled or uncontrollable power electronic device; Direct voltage after each generating set rectification is identical, is connected to busbar voltage.
High-voltage rectifying topology, inversion topological are three-phase, are whenever formed by even number n sub-units in series, are divided into two groups up and down, and every group of subelement number is n/2, and output phase voltage level number is n/2+1, and line voltage level number is n+1; See Fig. 2, Fig. 4, Fig. 6, rectification topology U
0, V
0, W
0The input of every phase is the midpoint of two groups of subelements, and (inductance can not be adopted in uncontrollable rectification, connects as shown in Figure 6) with coupling or non-coupling inductance L1 between input and the every group of subelement; The output of inversion topological is the midpoint of two groups of subelements, and is connected (as Fig. 3, shown in Figure 5) with coupling or non-coupling inductance L2 between U, V, the every phase output terminal of W and the every group of subelement.
See Fig. 2, Fig. 3, Fig. 7, the subelement of rectification topology, inversion topological is a half-bridge structure.See Fig. 7, its structure is made up of switching device IGBT1 and IGBT2 and dc bus capacitor C, and switching device IGBT1 and IGBT2 are in series, and IGBT1 of parallel connection direct capacitor C, and switching device again and IGBT2 be inverse parallel diode D1, D2 respectively; The common port of IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other subelement as the output of each subelement.
The rectification side is produced the High Level AC Voltage of optional frequency by a plurality of hydraulic generators, each hydraulic generator M obtains high direct voltage after the rectification of high-voltage rectifying topology, the high direct voltage that a plurality of hydraulic generator M produce links together and collects on the dc bus, voltage on the dc bus is as the dc voltage of inversion topological, dc voltage produces high pressure and is connected to the grid after the inversion topological inversion is alternating voltage.
See Fig. 7-1, electric current flows to B through IGBT2 from A, adopts the power cell output level " 0 " of half bridge inverter circuit.
See Fig. 7-2, electric current flows to A through sustained diode 2 from B, adopts the power cell output level " 0 " of half bridge inverter circuit.
See Fig. 7-3, electric current by dc bus capacitor C, flows to B from A again through sustained diode 1, adopts the power cell output level " 1 " of half bridge inverter circuit.
See Fig. 7-4, electric current by dc bus capacitor C, flows to A from B again through IGBT1, adopts the power cell output level " 1 " of half bridge inverter circuit.
See Fig. 4, Fig. 5, Fig. 8, the subelement of rectification topology, inversion topological is the H bridge construction.See Fig. 8, its structure is made up of four switching device IGBT1, IGBT2, IGBT3, IGBT4 and dc bus capacitor C, and switching device IGBT1 and IGBT2 are in series, and switching device IGBT3 and IGBT4 are in series, again with dc capacitor C parallel connection.And four switching device IGBT1, IGBT2, IGBT3, IGBT4 distinguish a reversal connection diode D1 in parallel, D2, D3, D4.Input, output that the common port of IGBT1 and IGBT2, IGBT3 and the common port of IGBT4 are connected with other power cell for this power cell.
The rectification side is produced the High Level AC Voltage of optional frequency by a plurality of hydraulic generators, each hydraulic generator M obtains high direct voltage after the rectification of high-voltage rectifying topology, the high direct voltage that a plurality of hydraulic generator M produce links together and collects on the dc bus, voltage on the dc bus is as the dc voltage of inversion topological, dc voltage produces high pressure and is connected to the grid after the inversion topological inversion is alternating voltage.
See Fig. 8-1, electric current flows to A through IGBT2, dc bus capacitor C, IGBT3 from B, or electric current flows to B through sustained diode 3, dc bus capacitor C, sustained diode 2 from A, adopts the power cell output level " 1 " of H bridge inverter main circuit this moment.
See Fig. 8-2, electric current flows to A through sustained diode 1, IGBT3 from B, or electric current flows to B through sustained diode 3, IGBT1 from A, adopts the power cell output level " 0 " of H bridge inverter main circuit this moment.
See Fig. 8-3, electric current flows to A through IGBT2, sustained diode 4 from B, or electric current flows to B through IGBT4, sustained diode 2 from A, adopts the power cell output level " 0 " of H bridge inverter main circuit this moment.
See Fig. 8-4, electric current flows to A through sustained diode 1, dc bus capacitor C, sustained diode 4 from B, or electric current flows to B through IGBT4, dc bus capacitor C, IGBT1 from A, adopts the power cell output level " 1 " of H bridge inverter main circuit this moment.
Embodiment 3
See Fig. 6, the high-voltage rectifying topology is the uncontrollable structure that a plurality of diode series connection constitute.Inversion topological is a three-phase, and inversion module is every to be formed by even number n sub-units in series, is divided into two groups up and down, and every group unit number is n/2, and output phase voltage level ladder number is n/2+1, and line voltage level number is n+1; The output of inversion module is the midpoint of two groups of unit, and is connected with coupling or non-coupling inductance between output and the every group of unit.
The rectification side is produced the High Level AC Voltage of optional frequency by a plurality of hydraulic generators, each hydraulic generator M obtains high direct voltage after the rectification of high-voltage rectifying topology, the high direct voltage that a plurality of hydraulic generator M produce links together and collects on the dc bus, voltage on the dc bus is as the dc voltage of inversion topological, dc voltage produces high pressure and is connected to the grid after the inversion topological inversion is alternating voltage.
See Fig. 3, Fig. 7, the inversion topological subelement is a half-bridge structure, is made up of switching device IGBT1 and IGBT2 and dc bus capacitor C, and switching device IGBT1 and IGBT2 are in series, IGBT1 of parallel connection direct capacitor C, and switching device again and IGBT2 be inverse parallel diode D1, D2 respectively; The common port of IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other subelement as the output of each subelement.
See Fig. 5, the inversion topological subelement also can be the H bridge construction, form by four IGBT switching devices, and diode of each IGBT switching device inverse parallel, after per two IGBT switching devices are in series, in parallel with dc capacitor C again.
The utility model can be connected the high direct voltage that a plurality of hydraulic generator units produce on the dc bus, directly exports high direct voltage.
No matter how many electric frequencies that the hydraulic turbine sends has, the quality of power supply how, all passes through high-voltage rectifying bridge rectification-multi-tool piece series resonant inverter link, finally exports the 50Hz sine wave, makes hydroelectric power generation can not waste any water resources.In addition,, can export many level waveform, reduce output harmonic wave content, make the hydroelectric quality of power supply very high, can directly be incorporated into the power networks by modulation algorithm owing to adopt multiple unit series connection MMC or H bridge output high pressure.
Transformerless hydroelectric power generation is incorporated into the power networks new topological, and this method is by high-voltage rectifying, and dc bus by the method for units in series, is exported high pressure again.No matter how many electric frequencies that the hydraulic turbine sends has, the quality of power supply how, all passes through high-voltage rectifying bridge rectification-multi-tool piece series resonant inverter link, finally exports the 50Hz sine wave, makes hydroelectric power generation can not waste any water resources.In addition,, can export many level waveform, reduce output harmonic wave content, make the hydroelectric quality of power supply very high, can directly be incorporated into the power networks by modulation algorithm owing to adopt multiple unit series connection MMC or H bridge output high pressure.
Claims (8)
1. transless hydraulic generator electricity generation grid-connecting topological structure, it is characterized in that, this topological structure comprises the hydraulic generator unit, the high-voltage rectifying topology that constitutes by a plurality of high-voltage rectifying modules, dc bus, the inversion topological that constitutes by a plurality of inversion modules, the High Level AC Voltage of the optional frequency that each hydraulic generator produces, after the rectification of high-voltage rectifying topology, obtain high direct voltage, the high direct voltage that produces links together and collects on the dc bus, voltage on the dc bus is as the dc voltage of inversion topological, dc voltage produces high pressure and is connected to the grid after the inversion topological inversion is alternating voltage.
2. a kind of transless hydraulic generator electricity generation grid-connecting topological structure according to claim 1 is characterized in that, described high-voltage rectifying module is formed three-phase commutation bridge output by uncontrollable or controlled power electronic device; Direct voltage after each generating set rectification is identical, is connected to dc bus.
3. a kind of transless hydraulic generator electricity generation grid-connecting topological structure according to claim 1, it is characterized in that, described high-voltage rectifying topology, inversion topological are three-phase, whenever, form by even number n sub-units in series, be divided into two groups up and down, every group of subelement number is n/2, and output phase voltage level number is n/2+1, and line voltage level number is n+1; The input of the every phase of rectification topology is the midpoint of two groups of subelements, and between input and the every group of subelement to be coupled or non-coupling inductance is connected; The output of inversion topological is the midpoint of two groups of subelements, and is connected with coupling or non-coupling inductance between output and the every group of subelement.
4. a kind of transless hydraulic generator electricity generation grid-connecting topological structure according to claim 3, it is characterized in that, described subelement is a half-bridge structure, form by switching device IGBT1 and IGBT2 and dc bus capacitor C, switching device IGBT1 and IGBT2 are in series, IGBT1 of parallel connection direct capacitor C, and switching device again and IGBT2 be inverse parallel diode D1, D2 respectively; The common port of IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other subelement as the output of each subelement.
5. a kind of transless hydraulic generator electricity generation grid-connecting topological structure according to claim 3, it is characterized in that, described subelement is the H bridge construction, form by four IGBT switching devices, diode of each IGBT switching device inverse parallel, after per two IGBT switching devices are in series, in parallel with dc capacitor C again.
6. a kind of transless hydraulic generator electricity generation grid-connecting topological structure according to claim 1 is characterized in that, described high-voltage rectifying topology is the uncontrollable structure that a plurality of diode series connection constitute; Inversion topological is a three-phase, and inversion module is every to be formed by even number n sub-units in series, is divided into two groups up and down, and every group of subelement number is n/2, and output phase voltage level number is n/2+1, and line voltage level number is n+1; The output of inversion module is the midpoint of two groups of subelements, and is connected with coupling or non-coupling inductance between output and the every group of subelement.
7. a kind of transless hydraulic generator electricity generation grid-connecting topological structure according to claim 6, it is characterized in that, described inversion topological subelement is a half-bridge structure, form by switching device IGBT1 and IGBT2 and dc bus capacitor C, switching device IGBT1 and IGBT2 are in series, IGBT1 of parallel connection direct capacitor C, and switching device again and IGBT2 be inverse parallel diode D1, D2 respectively; The common port of IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other subelement as the output of each subelement.
8. a kind of transless hydraulic generator electricity generation grid-connecting topological structure according to claim 6, it is characterized in that, described inversion topological subelement is the H bridge construction, form by four IGBT switching devices, diode of each IGBT switching device inverse parallel, after per two IGBT switching devices are in series, in parallel with dc capacitor C again.
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| CN201020267918XU CN201937280U (en) | 2010-07-22 | 2010-07-22 | Power generation grid-connected topological structure of transformerless hydraulic generator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025166A (en) * | 2010-07-22 | 2011-04-20 | 荣信电力电子股份有限公司 | Power-generating interconnected topological structure of transformerless water-turbine generator |
| CN102832801A (en) * | 2012-09-19 | 2012-12-19 | 山东大学 | System and method for grouping and pre-charging modular multilevel converter capacitor |
| CN104821602A (en) * | 2015-05-07 | 2015-08-05 | 沈阳远大电力电子科技有限公司 | Synchronous grid connection system and synchronous grid connection method |
-
2010
- 2010-07-22 CN CN201020267918XU patent/CN201937280U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025166A (en) * | 2010-07-22 | 2011-04-20 | 荣信电力电子股份有限公司 | Power-generating interconnected topological structure of transformerless water-turbine generator |
| CN102832801A (en) * | 2012-09-19 | 2012-12-19 | 山东大学 | System and method for grouping and pre-charging modular multilevel converter capacitor |
| CN102832801B (en) * | 2012-09-19 | 2015-07-08 | 山东大学 | System and method for grouping and pre-charging modular multilevel converter capacitor |
| CN104821602A (en) * | 2015-05-07 | 2015-08-05 | 沈阳远大电力电子科技有限公司 | Synchronous grid connection system and synchronous grid connection method |
| CN104821602B (en) * | 2015-05-07 | 2016-11-30 | 沈阳远大科技电工有限公司 | A kind of synchronization grid-connected system and method |
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Granted publication date: 20110817 Termination date: 20130722 |