CN203883469U - Double-fed wind generation set converter topological structure for flexible direct-current electricity transmission system - Google Patents
Double-fed wind generation set converter topological structure for flexible direct-current electricity transmission system Download PDFInfo
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- CN203883469U CN203883469U CN201420171452.1U CN201420171452U CN203883469U CN 203883469 U CN203883469 U CN 203883469U CN 201420171452 U CN201420171452 U CN 201420171452U CN 203883469 U CN203883469 U CN 203883469U
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Abstract
The utility model relates to a double-fed wind generation set converter topological structure for a flexible direct-current electricity transmission system, and belongs to the technical field of wind power generation. The topological structure comprises a stator side converter, a machine side converter and a net side DC-DC converter. One end of the stator side converter is connected with a stator of a wind generator, and the other end of the stator side converter is connected with the machine side converter and the net side DC-DC converter respectively. The other end of the machine side converter is connected with a rotor of the wind generator. The other end of the net side DC-DC converter is connected with a high-voltage direct-current bus through a high-voltage direct-current cable, and double-fed wind generation set flexible direct-current electricity transmission grid connection generating is achieved. According to the utility model, the machine side converter is easy and flexible to control, the rated power is small, an extra storage battery does not need to be used as an inversion power supply, meanwhile, a boosting electricity transformer and a box-type substation are not needed, space occupied by the topological structure is small, the cost is low, the consumption is small, and the double-fed wind generation set converter topological structure is especially suitable for offshore wind power.
Description
Technical field
The utility model relates to a kind of current transformer, and the current transformer that especially a kind of double feed wind power generator group for flexible DC power transmission system is used, belongs to technical field of wind power generation.
Background technology
MW class wind turbine group is generally all exported 690V50Hz alternating current by AC-DC-AC converter at present, converges to ac bus grid-connected after step-up transformer boosts.Its shortcoming is: need step-up transformer, box-type substation, floor space is large, and cost is high, and loss is high, is especially restricting the development of offshore wind farm.
For addressing the above problem, it is the Chinese patent application of ZL 201320114072.X that applicant proposes the patent No., disclose a kind of double feed wind power generator group high voltage direct current converter topologies, this topological structure comprises rectifier, pusher side current transformer, net side DC-DC booster converter; Described rectifier one end is connected with the stator of wind-driven generator, and the other end is connected with described pusher side current transformer, described net side DC-DC booster converter respectively; The described pusher side current transformer other end is connected with the rotor of wind-driven generator; The other end of described net side DC-DC booster converter is connected with high voltage dc bus by high voltage direct current cable.Although this structure can fundamentally solve the grid-connected problem of double feed wind power generator group high voltage direct current, but in the time that starting, double feed wind power generator group need extra storage battery to provide inverter to described pusher side current transformer, and control underaction, cost is high, is unfavorable for applying.
Summary of the invention
Main purpose of the present utility model is: the shortcoming existing for above-mentioned prior art, provide one not only not need to use extra storage battery, and control the Double-feed wind power unit converter topologies for flexible DC power transmission system more flexible, cost economy, thereby easy to utilize.
In order to reach above object, the utility model comprises stator side current transformer, pusher side current transformer, net side DC-DC converter for the Double-feed wind power unit converter topologies of flexible DC power transmission system.Described stator side current transformer one end is connected with the stator of wind-driven generator, and the other end is connected with described pusher side current transformer, described net side DC-DC converter respectively; The described pusher side current transformer other end is connected with the rotor of wind-driven generator; The other end of described net side DC-DC converter is connected with high voltage dc bus by high voltage direct current cable.
The utility model further improves, and described stator side current transformer is made up of rectifier and Boost chopper, realizes rectification, boosts, MPPT maximum power point tracking and power factor emendation function; Described rectifier can be uncontrollable rectifier, can be also controlled rectifier (as voltage-source type PWM rectifier).
The utility model further improves, and described net side DC-DC converter is reversible transducer, comprises 1 grade or 1 grade of above buck loop, realizes DC boosting and step-down and voltage stabilizing function.
The utility model further improves, and described pusher side current transformer is consistent with existing pusher side current transformer, but its rated power can be less, and control method is more simple, flexible.
The beneficial effects of the utility model are: the alternating current that double feed wind power generator group is sent is after rectification is boosted, directly rise to high direct voltage by net side DC-DC converter, realizing long-range multiterminal flexible DC power transmission generates electricity by way of merging two or more grid systems, the control of pusher side current transformer is more simple and flexible, and its rated power is less, without extra storage battery as its inverter, simultaneously without step-up power transformers, box-type substation, floor space is little, low cost of manufacture, loss is little, benefits and applies, and is particularly suitable for offshore wind farm.
Brief description of the drawings
Accompanying drawing 1 is the schematic diagram of the utility model topological structure.
Wherein, 1-pusher side current transformer; 2-stator side current transformer; 3-net side DC-DC converter; 4-double feed wind power generator stator; 5-double feed wind power generator rotor; 6-high-voltage direct current power grid.
Embodiment
Below in conjunction with accompanying drawing 1, the utility model is described in further detail.
As shown in Figure 1, the utility model comprises pusher side current transformer 1, stator side current transformer 2, net side DC-DC converter 3 for the Double-feed wind power unit converter topologies of flexible DC power transmission system.All variable alternating current is after 2 rectifications of stator side current transformer are boosted for the frequency that double feed wind power generator stator 4 is exported and amplitude, and one end is connected with pusher side current transformer 1; The other end directly boosts to high direct voltage (as 10kV) through net side DC-DC converter 3, converges to high-voltage direct current power grid 6, realizes controlled direct current grid-connected.Pusher side current transformer 1 one end is connected with double feed wind power generator rotor 5, and the exciting current of double feed wind power generator rotor 5 is provided; The other end of pusher side current transformer 1 is connected with net side DC-DC converter 3, and the active power that rotor 5 can be sent is transferred to high-voltage direct current power grid 6 by net side DC-DC converter 3.
Described stator side current transformer 2 is made up of rectifier and Boost chopper, wherein, the alternating current of generator unit stator output is carried out rectification by described rectifier, then boosted by described Boost chopper, and realize MPPT maximum power point tracking (MPPT), catch maximal wind-energy, thereby the alternating current of generator unit stator output, its frequency and amplitude all can change; Can also carry out power factor correction (PFC) to the electric current and voltage of generator output simultaneously, improve generator active power fan-out capability, reduce current harmonic content, and then further reduced generator loss, improve system effectiveness.
Described net side DC-DC converter 3 is reversible transducer, comprises 1 grade or 1 grade of above buck loop, realizes DC boosting, step-down and voltage stabilizing function.When use, before fan starting is grid-connected, described net side DC-DC converter 3 works in DC decompression state, and direct current network voltage is down to proper level and is made it constant, for described pusher side current transformer 1 provides inverter, thus in the time of wind-powered electricity generation unit starting without extra storage battery; Described pusher side current transformer 1 provides three-phase AC excitation electric current to rotor 5, wind-powered electricity generation unit starting through inversion.After the normal operation of wind-powered electricity generation unit, described net side DC-DC converter 3 works in DC boosting state, and the power that wind-powered electricity generation unit is sent passes to high-voltage direct current power grid 6.
In the time that wind-powered electricity generation unit normally moves, because described stator side current transformer 2 does not require generator unit stator output constant voltage constant frequency (as 690V50Hz) alternating current, thereby described pusher side current transformer 1 is controlled more simple and flexible, its output frequency only need be followed the tracks of the variation of generator speed by a certain percentage, can realize generator and work in all the time a kind of running status (as supersynchronous running status), and without the control problem of considering to cross over up and down at synchronous point; Also can make thus revolutional slip very low, thereby make the rated power of pusher side current transformer 1 less, further reduce cost.
In addition to the implementation, the utility model can also have other execution mode.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.
Claims (3)
1. for a Double-feed wind power unit converter topologies for flexible DC power transmission system, comprise stator side current transformer, pusher side current transformer, net side DC-DC converter; It is characterized in that: described stator side current transformer one end is connected with the stator of wind-driven generator, the other end is connected with described pusher side current transformer, described net side DC-DC converter respectively; The described pusher side current transformer other end is connected with the rotor of wind-driven generator; The other end of described net side DC-DC converter is connected with high voltage dc bus by high voltage direct current cable, realizes Double-feed wind power unit flexible DC power transmission and generates electricity by way of merging two or more grid systems.
2. according to claim 1 for the Double-feed wind power unit converter topologies of flexible DC power transmission system, it is characterized in that: described stator side current transformer is made up of rectifier and Boost chopper, realize rectification, boost, MPPT maximum power point tracking and power factor emendation function.
3. according to claim 1 for the Double-feed wind power unit converter topologies of flexible DC power transmission system, it is characterized in that: described net side DC-DC converter is reversible transducer, comprise 1 grade or 1 grade of above buck loop, realize DC boosting and step-down and voltage stabilizing function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420171452.1U CN203883469U (en) | 2014-04-10 | 2014-04-10 | Double-fed wind generation set converter topological structure for flexible direct-current electricity transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420171452.1U CN203883469U (en) | 2014-04-10 | 2014-04-10 | Double-fed wind generation set converter topological structure for flexible direct-current electricity transmission system |
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| Publication Number | Publication Date |
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| CN203883469U true CN203883469U (en) | 2014-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420171452.1U Expired - Fee Related CN203883469U (en) | 2014-04-10 | 2014-04-10 | Double-fed wind generation set converter topological structure for flexible direct-current electricity transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887789A (en) * | 2014-04-10 | 2014-06-25 | 曲阜师范大学 | Double-fed wind generation set converter topological structure for flexible direct-current electricity transmission system |
| CN108377102A (en) * | 2018-03-30 | 2018-08-07 | 南京航空航天大学 | A method of reducing capacitance in monophasic pulses if load AC-DC power supplys |
-
2014
- 2014-04-10 CN CN201420171452.1U patent/CN203883469U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887789A (en) * | 2014-04-10 | 2014-06-25 | 曲阜师范大学 | Double-fed wind generation set converter topological structure for flexible direct-current electricity transmission system |
| CN108377102A (en) * | 2018-03-30 | 2018-08-07 | 南京航空航天大学 | A method of reducing capacitance in monophasic pulses if load AC-DC power supplys |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141015 Termination date: 20210410 |