CN102780231A - Direct-current current source loop-based wind power station converging and grid-connecting method - Google Patents
Direct-current current source loop-based wind power station converging and grid-connecting method Download PDFInfo
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- CN102780231A CN102780231A CN2012101562327A CN201210156232A CN102780231A CN 102780231 A CN102780231 A CN 102780231A CN 2012101562327 A CN2012101562327 A CN 2012101562327A CN 201210156232 A CN201210156232 A CN 201210156232A CN 102780231 A CN102780231 A CN 102780231A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a direct-current current source loop-based wind power station converging and grid-connecting method, belonging to the technology of the conversion and the transmission of power. The problem of the converging and grid-connecting of a wind power station can be solved. The method is characterized in that one or more fan converters is/are connected with a grid-connected converter in series by a filter inductor-containing direct-current current source loop, so that the electric energy output by a wind driven generator is transmitted into the grid-connected converter from the fan converter(s) through the direct-current current source loop, and is transmitted into a power grid through the grid-connected converter. The method has the advantages that the output voltage at the direct-current current source loop side(s) of the fan converter(s) can be overlapped with one another, so that the high voltage can be formed; and the technology can be used for the converging and the grid-connecting of the land wind power station or the offshore wind power station.
Description
Technical field
The present invention relates to a kind of power transferring method, more specifically, relate to a kind of wind energy turbine set and conflux and combination method based on the direct current resource loop.
Background technology
Wind energy is the very big new forms of energy of a kind of potentiality, and the someone estimated that the wind resource that can be used to generate electricity on the earth had 10,000,000,000 kilowatts approximately, almost is 10 times of present whole world hydroelectric power generation amount.The technology of utilizing wind energy to generate electricity has also obtained the development of advancing by leaps and bounds; Recent years, the installed capacity of wind power generation had huge growth, but owing to limited by environmental condition, and the clean energy resource general installed capacity of generating electricity is little; It is wide to distribute; Power supply quality is high and away from major network, and like medium and small-scale water and electricity factory, wind energy turbine set (containing marine wind electric field), tidal power station, solar power station etc., reason such as very high and alternating current circuit conveying capacity is on the low side owing to its operation cost makes to adopt and exchanges interconnect scheme and meet the demands in economical and technical all being difficult to; Utilizing direct current transportation and major network to realize interconnected is the best mode that makes full use of regenerative resource, helps protecting environment.The wind-electricity integration busbar voltage fluctuation of alleviating the system voltage fluctuation and causing.The dc-isolation interaction energy improves the low voltage ride-through capability of wind energy turbine set under fault in ac transmission system.The dynamic passive compensation ability, wind farm grid-connected best-of-breed technology means.Simplify double-fed induction blower fan, permanent magnet direct-drive blower fan, the design of asynchronous induction blower fan reduces the wind energy turbine set construction cost.Adopting direct current cables as transport path, is the best means of long-distance large offshore grid-connected wind farm.
But up-to-date data and media report show; Conflux and combination method that the long-distance large offshore wind farm adopts are: the electric energy that wind-driven generator sends becomes direct current through the blower fan current transformer; And then become alternating current by grid-connected converter; Pass through step-up transformer then and bring the voltage up to suitable value, the current transformer that passes through flexible DC power transmission again is transformed into high voltage direct current and carries out the sea long distance transmission.Electric energy has arrived on the bank, passes through the current transformer of flexible DC power transmission again, is transformed into alternating current and is connected to the grid.The method of confluxing of this wind energy turbine set is that electric current confluxes from essence; Every typhoon machine all will be equipped with a transformer; With the voltage transformation of blower fan current transformer output is the voltage (being generally 35kV) of bus rod, adopts the mode of parallel connection between the blower fan, and little electric current is compiled; Become a big electric current, thereby reach the purpose of confluxing.
This conflux and combination method has following shortcoming: 1, the blower fan current transformer itself has DC link, but will DC converting become to exchange; After boosting; Current transformer through flexible DC power transmission is transformed into direct current again, and the interchange link in the middle of so just having increased has increased equipment investment; Reduced reliability, and cost is raise.2, need set up the high-voltage large-capacity current transformer that high voltage substation and flexible DC power transmission are used at sea, difficulty of construction is increased, and increased construction cost and operation expense.3, wind energy turbine set need be confluxed with submarine cable, confluxes if adopt to exchange, and so alternate electric capacity and electric capacity relatively can be very big, and the difficulty that this can cause the transmission of power to become also can increase equipment investment.
Summary of the invention:
It is to overcome the above problems a feasible thinking is provided that wind energy turbine set based on the direct current resource loop involved in the present invention is confluxed with combination method.
Wind energy turbine set based on the direct current resource loop proposed by the invention is confluxed and combination method; From being that a kind of voltage " confluxes " in essence; Definite a bit saying be called " converge and press "; This method is together in series with the direct current resource loop side of direct current resource loop with blower fan current transformer and grid-connected converter; The voltage of the direct current resource loop side of then a plurality of blower fan current transformers output just can stack up, and becomes a high voltage, therefore need direct current not become interchange and also can realize the purpose of boosting; The suitable voltage of direct current resource loop side output of grid-connected converter makes the DC current source current in loop keep reasonably value, and it is available that wherein blower fan current transformer and grid-connected converter can have various ways.
The present invention adopts following proposal to realize the object of the invention:
A kind of wind energy turbine set based on the direct current resource loop is confluxed and combination method, and its main circuit structure comprises electrical network, grid-connected converter, direct current resource loop, one or more blower fan current transformer, wind-driven generator; Control system comprises grid-connected converter control system and blower fan converter control system;
The direct current resource loop is together in series blower fan current transformer and said grid-connected converter; Grid-connected converter is connected between electrical network and the direct current resource loop; The blower fan current transformer is connected between direct current resource loop and the wind-driven generator;
Electrical network is one of them or its combination of three-phase alternating current electrical network, single phase alternating current (A.C.) electrical network, direct voltage source electrical network, DC current source electrical network;
Grid-connected converter is constituted by power electronic device, electric capacity, inductance, resistance or its, grid-connected converter and the collaborative work of grid-connected converter control system, and it act as control DC current source current in loop size, transmission of electric energy in electrical network simultaneously;
The direct current resource loop is constituted by power electronic device, electric capacity, inductance, resistance or its, and comprises an inductance at least, and it act as and suppresses the DC current source current in loop and change;
The blower fan current transformer is constituted by power electronic device, electric capacity, inductance, resistance or its, and blower fan current transformer and the collaborative work of blower fan converter control system are used to control the power that wind-driven generator sends, simultaneously to DC current source loop transport electric energy.
In the method that is proposed among the present invention, the voltage of the direct current resource loop side of blower fan current transformer output can stack up, and in the direct current resource loop, forms high voltage, and this high-tension formation is the process of compiling of energy.
Grid-connected converter and grid-connected converter control system are adjusted direct current current in loop size according to the watt level that is transported in the electrical network; Its purpose is; During the power reduction in being transported to electrical network (or increase); Make the voltage of the direct current resource loop side output of grid-connected converter and blower fan current transformer keep higher, the DC current source current in loop reduces (or increase).
In the method that is proposed among the present invention; Contain protective device in electrical network, grid-connected converter, direct current resource loop, blower fan current transformer, the wind-driven generator; By lightning arrester, circuit breaker, by-pass switch etc. one of them or it constitutes, parallel connection or be connected on the device or device that needs protection, the electric current and the voltage power supply that are used for the protection system each several part are in the scope of safety; Under the failure condition, the safety of each device or device in the protection system.
Description of drawings
The wind energy turbine set that Fig. 1 is based on the direct current resource loop sketch map with combination method that confluxes
Fig. 2 is specifically to be based on the wind energy turbine set of the direct current resource loop main circuit structure figure with combination method that confluxes in the execution mode
Fig. 3 is specifically to be the blower fan converter structure sketch map in the execution mode
Fig. 4 is when the variable power of wind-driven generator output, the variable power curve of input electrical network
Embodiment
Wind energy turbine set based on the direct current resource loop proposed by the invention is confluxed and combination method, combines the explanation of accompanying drawing and embodiment as follows at present:
As shown in Figure 2, the structure of main circuit and parameter: electrical network is the three-phase alternating current electrical network, and the voltage of access point is 220kV, reduces the voltage to 35kV through step-down transformer, and the no-load voltage ratio of this step-down transformer is 220kV/35kV, and capacity is 60MVA, and impedance is 10%.
Insert two rectifier transformers on the 35kV bus, no-load voltage ratio is 35kV/4kV, and the high-pressure side of two rectifier transformers is triangle and connects; Wherein a rectifier transformer low-pressure side is star-like connection; An other rectifier transformer low-pressure side is that triangle connects, and capacity is 8.5MVA, and impedance is 10%.The low-pressure side of two rectifier transformers connects the Thyristor Controlled rectification circuit respectively; Two Thyristor Controlled rectification circuits are connected in series; Be linked in the direct current resource loop in series connection then, the inductance of series connection access 500mH is used to suppress the fluctuation of electric current in the direct current resource loop.
Be connected to filtering and reactive-load compensation equipment on the 35kV bus, by single tuned filter, high pass filter; And STATCOM (STATCOM) constitutes, and wherein single tuned filter is by 5 times, 7 times; 11 times, 13 compositions, the fundamental wave reactive power capacity is 2MVar; High pass filter is 22.5 high pass filters, and capacity is 2MVar.The capacity of STATCOM (STATCOM) is 10MVar.Single tuned filter and high pass filter are used for compensating capacitive reactive power, and the harmonic current on the filtering 35kV bus.It is 1 that the power factor that act as control 220kV access point of STATCOM (STATCOM) connects.
Simulate wind energy turbine set with three typhoon power generators.Wind-driven generator adopts asynchronous induction machine, and rated capacity is 5MW, and rated voltage is 2kV.The blower fan current transformer adopts the combination of DC chopper circuit and mid point clamping type three-level voltage source current transformer.Wherein the voltage of two electric capacity of DC side is 1.5kV, and the interchange of current transformer is surveyed output line voltage and is 2kV to the maximum, and is as shown in Figure 3.
The control of blower fan current transformer: the main effect of mid point clamping type three-level voltage source current transformer is suitable alternating voltage of output; Be used to drive asynchronous induction generator; The power of control asynchronous induction generator output; Driving method about asynchronous induction generator is not a content of the present invention, therefore repeats no more here, and its driving method can be consulted relevant data.
The control of DC chopper circuit: as feedback signal, after comparing with the capacitance voltage reference value, get into pi controller with the dc capacitor voltage of voltage source converter; Controller is output as the duty ratio of switching tube; Its scope is 0 to 1, and this duty ratio and amplitude are 0 to 1, and frequency is after the triangular wave of 500Hz compares; Generate the switching signal of switching tube, be used for the break-make of driving switch.Therefore the control of DC chopper circuit can make the dc capacitor voltage of voltage source converter maintain near the capacitance voltage reference value.
The control of grid-connected converter: detect the active power of importing electrical network from the 35kV side of rectifier transformer, this active power is 0.1 second through a time constant, gains to be-0.11 one order inertia filtering; Pass through the amplitude limit link again, this value is limited between 0.1 to 2, obtain the reference current value of direct current resource loop then; The actual current of this reference value and direct current resource loop compares; Result relatively is input in the pi controller, passes through the amplitude limit link then, and this value is restricted between-0.85 to+0.85; Ask the anticosine of this value then, obtain the trigger angle of thyristor at last.This trigger angle is generating link through trigger impulse, generates the trigger impulse that is used to trigger thyristor.Artificial circuit.When simulation time was 1.4 seconds, the power of wind-driven generator output began to increase from 0MW, and when simulation time was 4.6 seconds, the power of wind-driven generator was increased to 14MW, remains unchanged afterwards.As shown in Figure 4, be the active power change curve of input electrical network, simulation result shows that method proposed by the invention can reach its intended purposes.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (4)
1. the wind energy turbine set based on the direct current resource loop is confluxed and combination method; It is characterized in that the main circuit structure of said method comprises electrical network (100), grid-connected converter (101), direct current resource loop (102), one or more blower fan current transformer (104), wind-driven generator (105); The control system of said method comprises grid-connected converter control system (103) and blower fan converter control system (106);
Said direct current resource loop (102) is together in series said one or more blower fan current transformers (104) and said grid-connected converter (101); Said grid-connected converter (101) is connected between said electrical network (100) and the said direct current resource loop (102); Said blower fan current transformer (104) is connected between said direct current resource loop (102) and the said wind-driven generator (105);
Said electrical network (100) is one of them or its combination of three-phase alternating current electrical network, single phase alternating current (A.C.) electrical network, direct voltage source electrical network, DC current source electrical network;
Said grid-connected converter (101) is constituted by power electronic device, electric capacity, inductance, resistance or its; Said grid-connected converter (101) and said grid-connected converter control system (103) collaborative work; Be used to control DC current source current in loop size, simultaneously transmission of electric energy in said electrical network (100);
Said direct current resource loop (102) is constituted by power electronic device, electric capacity, inductance, resistance or its, and comprises an inductance (102a) at least, and it act as the electric current that suppresses in the said direct current resource loop (102) and changes;
Said blower fan current transformer (104) is constituted by power electronic device, electric capacity, inductance, resistance or its; Said blower fan current transformer (104) and said blower fan converter control system (106) collaborative work; Be used to control the power that said wind-driven generator (105) sends, simultaneously to said direct current resource loop (102) transmission of electric energy.
2. the wind energy turbine set based on the direct current resource loop according to claim 1 is confluxed and combination method; It is characterized in that; The voltage of the direct current resource loop side output of said blower fan current transformer (104) can stack up, and in described direct current resource loop (102), forms high voltage.
3. the wind energy turbine set based on the direct current resource loop according to claim 1 is confluxed and combination method; It is characterized in that; Described grid-connected converter control system (103) is adjusted the size of current in the said direct current loop (102) with described grid-connected converter (101) according to the watt level that is transported in the electrical network (100); Its purpose is; During the power reduction in being transported to said electrical network (100) (or increase), make the voltage of the direct current resource loop side output of said grid-connected converter (101) and said blower fan current transformer (104) keep higher, the electric current in the said direct current resource loop (102) reduces (or increase).
4. conflux and combination method according to the wind energy turbine set described in the claim 1 based on the direct current resource loop; It is characterized in that; Described electrical network (100), grid-connected converter (101), direct current resource loop (102), blower fan current transformer (104), wind-driven generator contain protective device in (105); By lightning arrester, circuit breaker, by-pass switch etc. one of them or it constitutes, parallel connection or be connected on the device or device that needs protection, the electric current and the voltage power supply that are used for the protection system each several part are in the scope of safety; Under the failure condition, the safety of each device or device in the protection system.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208816A (en) * | 2013-04-08 | 2013-07-17 | 浙江大学 | Power collection and transmission system for wind power plant and voltage control method for alternating current generatrix of power collection and transmission system |
| CN105515052A (en) * | 2016-01-28 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Fault ride-through implementation method and system for direct-driven draught fan |
| CN106026171A (en) * | 2016-06-29 | 2016-10-12 | 中国西电电气股份有限公司 | Wind-power direct-current collection power transmission system |
| CN106877501A (en) * | 2017-03-03 | 2017-06-20 | 上海交通大学 | The direct current transformer station level runtime and method of integrated conception are protected based on control |
| CN109100590A (en) * | 2018-07-23 | 2018-12-28 | 南京南瑞继保电气有限公司 | A kind of experiment power supply and tandem type static synchronous compensator converter valve test macro |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101291071A (en) * | 2008-06-18 | 2008-10-22 | 张皓 | Electric inverter for direct grid connecting of wind power generation |
| US20110140511A1 (en) * | 2010-10-25 | 2011-06-16 | Einar Vaughn Larsen | Electric power transmission system for wind turbine and wind turbine farm and method for operating same |
| CN102130605A (en) * | 2009-09-04 | 2011-07-20 | 洛克威尔自动控制技术股份有限公司 | Grid fault ride-through for current source converter-based wind energy conversion systems |
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2012
- 2012-05-18 CN CN2012101562327A patent/CN102780231A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101291071A (en) * | 2008-06-18 | 2008-10-22 | 张皓 | Electric inverter for direct grid connecting of wind power generation |
| CN102130605A (en) * | 2009-09-04 | 2011-07-20 | 洛克威尔自动控制技术股份有限公司 | Grid fault ride-through for current source converter-based wind energy conversion systems |
| US20110140511A1 (en) * | 2010-10-25 | 2011-06-16 | Einar Vaughn Larsen | Electric power transmission system for wind turbine and wind turbine farm and method for operating same |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208816A (en) * | 2013-04-08 | 2013-07-17 | 浙江大学 | Power collection and transmission system for wind power plant and voltage control method for alternating current generatrix of power collection and transmission system |
| CN105515052A (en) * | 2016-01-28 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Fault ride-through implementation method and system for direct-driven draught fan |
| CN105515052B (en) * | 2016-01-28 | 2018-10-26 | 云南电网有限责任公司电力科学研究院 | A kind of fault traversing realization method and system of straight drive blower |
| CN106026171A (en) * | 2016-06-29 | 2016-10-12 | 中国西电电气股份有限公司 | Wind-power direct-current collection power transmission system |
| CN106877501A (en) * | 2017-03-03 | 2017-06-20 | 上海交通大学 | The direct current transformer station level runtime and method of integrated conception are protected based on control |
| CN109100590A (en) * | 2018-07-23 | 2018-12-28 | 南京南瑞继保电气有限公司 | A kind of experiment power supply and tandem type static synchronous compensator converter valve test macro |
| CN109100590B (en) * | 2018-07-23 | 2021-04-20 | 南京南瑞继保电气有限公司 | Test power supply and cascading static synchronous compensator converter valve test system |
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Application publication date: 20121114 |