CN202602291U - Wind generating set filter circuit and power generation system - Google Patents

Wind generating set filter circuit and power generation system Download PDF

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Publication number
CN202602291U
CN202602291U CN2012202084224U CN201220208422U CN202602291U CN 202602291 U CN202602291 U CN 202602291U CN 2012202084224 U CN2012202084224 U CN 2012202084224U CN 201220208422 U CN201220208422 U CN 201220208422U CN 202602291 U CN202602291 U CN 202602291U
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filter circuit
wind turbine
inductor
turbine generator
capacitor
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徐芳
宫玉鹏
金嘉帅
吴让慧
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Sinovel Wind Group Co Ltd
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Sinovel Wind Group Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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Abstract

The utility model provides a wind generating set filter circuit and a power generation system. The filter circuit comprises a first filter unit and a second filter unit connected in series. The first filter unit is composed of a first capacitor, a first inductor and a first resistor connected in series. The second filter unit is formed by series connection between a second inductor and a second resistor and then parallel connection among the second inductor, the second resistor and a second capacitor. Values of the second resistor, the first capacitor, the second capacitor, the first inductor and the second inductor meet the following condition: R2<1. According to the wind generating set filter circuit and the power generation system, the first filter unit and the second filter unit are utilized to form two resonant frequencies to absorb two harmonic waves that greatly affect fluctuation of an electrical network, thereby effectively improving fluctuation and flicker of a voltage and improving electric energy quality of grid connection generation.

Description

Wind turbine generator filter circuit and electricity generation system
Technical field
The utility model relates to wind generating technology, relates in particular to a kind of wind turbine generator filter circuit and electricity generation system.
Background technology
Voltage fluctuation and flicker is the key property parameter of the examination Variable Speed Wind Power Generator quality of power supply.Variable Speed Wind Power Generator is when work; The operation characteristic of the uncertainty of wind-resources and unit itself is the major reason that causes wind power generator incorporated in power network group output-power fluctuation; Thereby and produce voltage fluctuation and flickering, the quality of power supply of local electrical network is had harmful effect.Moreover, more serious voltage fluctuation and flickering phenomenon also can shorten the useful life of power consumption equipment, increase the power loss of power consumption equipment, cause equipment by overheated and phenomenon of the failure that cause, and transmission causes interference to data-signal.Research shows that the voltage fluctuation meeting in 0.1Hz～35Hz frequency range causes the flickering that human eye can be awared.
At present, the wind-powered electricity generation unit can cause current fluctuation in the running continuously, and this continuous current fluctuation meeting causes more serious flickering problem.Based on on-the-spot actual test data, the wind-powered electricity generation unit has significantly low-frequency harmonics generation at two frequency places of low-frequency range.As do not take measures, the harmonic signal at this two place can cause a series of power quality problems to electrical network.
The utility model content
The utility model provides a kind of wind turbine generator filter circuit and electricity generation system, has wind-powered electricity generation set grid-connection generating after-current signal influence from harmonic now to solve, and then influences the problem of the quality of power supply, reaches the purpose of reduced harmonic.
The utility model provides a kind of wind turbine generator filter circuit, wherein: comprise first filter unit and second filter unit of mutual serial connection, wherein
Said first filter unit is formed by first capacitor, first inductor and first resistor in series;
Said second filter unit is formed in parallel with second capacitor after by second inductor and second resistor in series;
Said second resistor, first capacitor, second capacitor, the value of first inductor and second inductor satisfies following condition:
R 2<1 ohm;
1 / L 1 C 1 = 1 / L 2 C 2 ;
Wherein, C 1Be the capacitance of first capacitor, L 1Be the inductance value of first inductor, C 2Be the capacitance of second capacitor, L 2It is the inductance value of second inductor; R 2It is the resistance value of second resistor.
Aforesaid wind turbine generator filter circuit, wherein, preferably, the value of said first capacitor is:
Figure BDA00001619473000022
The value of said first inductor is:
Figure BDA00001619473000023
Wherein, C 1Be the capacitance of first capacitor, L 1Be the inductance value of first inductor, ω 1And ω 2Be respectively the frequency of two place's low-frequency harmonics, ω The workerBe the fundamental frequency frequency, Q is the fundamental wave reactive power power of said filter circuit compensation, and U is the voltage of said filter circuit.
Aforesaid wind turbine generator filter circuit, wherein, preferably, the value of said second capacitor is:
Figure BDA00001619473000024
The value of said second inductor is:
Figure BDA00001619473000025
Wherein, C 2Be the capacitance of second capacitor, L 2Be the inductance value of second inductor, ω 1And ω 2Be respectively the frequency of two place's low-frequency harmonics, ω The workerBe the fundamental frequency frequency, Q is the fundamental wave reactive power power of said filter circuit compensation, and U is the voltage of said filter circuit.
Aforesaid wind turbine generator filter circuit, wherein, preferably, the value of said first resistor and second resistor satisfies: R 1>R 2, wherein, R 1Be the resistance value of first resistor, R 2It is the resistance value of second resistor.
The utility model also provides a kind of wind turbine generator electricity generation system; Comprise wind turbine generator and transformer group; Wherein: said electricity generation system also comprises the wind turbine generator filter circuit that the utility model provides; One end of said filter circuit links to each other respectively with the input of the generator output end of said wind turbine generator and transformer group, the other end ground connection of said filter circuit.
Aforesaid wind turbine generator electricity generation system; Wherein, Preferably; Said transformer group comprises that grade is first step-up transformer of 0.69/35KV and second step-up transformer that grade is 35/110KV, and said first step-up transformer and second step-up transformer are connected between the output and electrical network of said generator through cable.
Aforesaid wind turbine generator electricity generation system; Wherein, Preferably: said generator has three outputs, and said electricity generation system comprises three groups of said wind turbine generator filter circuits, and three groups of said filter circuits and said three outputs connect one to one.
Wind turbine generator filter circuit that the utility model provides and electricity generation system utilize first filter unit and two resonance frequencys of second filter unit formation to absorb two bigger place's harmonic waves of power network fluctuation influence; Effectively improve the fluctuation and the flickering phenomenon of voltage, improved the quality of power supply of generating electricity by way of merging two or more grid systems.
Description of drawings
The wind turbine generator filter circuit construction sketch map that Fig. 1 provides for the utility model embodiment one;
The wind turbine generator filter circuit impedance characteristic sketch map that Fig. 2 provides for the utility model embodiment one;
Fig. 3 is not for installing the low-frequency harmonics curve chart of the wind turbine generator filter circuit that the utility model embodiment one provides additional;
Fig. 4 is the low-frequency harmonics curve chart that installs the wind turbine generator filter circuit that the utility model embodiment one provides additional;
The phase structure sketch map of the wind turbine generator electricity generation system that Fig. 5 provides for the utility model embodiment two;
The three-phase structure sketch map of the wind turbine generator electricity generation system that Fig. 6 provides for the utility model embodiment two.
Embodiment
Embodiment one
The wind turbine generator filter circuit construction sketch map that Fig. 1 provides for the utility model embodiment one; The utility model embodiment one provides a kind of wind turbine generator filter circuit; Be applicable to the electricity generation system of wind turbine generator; Electric current through to wind turbine generator outlet side output carries out Filtering Processing, again after the boosting of transformer, to the electrical network injection current.As shown in Figure 1, this filter circuit comprises first filter unit 1 and second filter unit 2 of mutual serial connection, and wherein, first filter unit 1 is in series by the first capacitor C1, the first inductor L1 and first resistor R 1; Second filter unit 2 is formed in parallel with the second capacitor C2 by the second inductor L2 and second resistor R, 2 series connection backs.
Above-mentioned first filter unit 1 is a series connection resonant tank, and second filter unit 2 is a parallelly connected resonant tank, and wherein, the tuned frequency of first filter unit 1 is:
Figure BDA00001619473000041
Wherein, L 1Be the inductance value of the first inductor L1, C 1It is the capacitance of the first capacitor C1;
The value of second resistor R 2 in second filter unit 2 satisfies R 2<in the time of 1 ohm, can this resistance value be ignored, promptly when calculating, be taken as zero, at this moment, the tuned frequency of second filter unit 2 is:
Figure BDA00001619473000042
Wherein, L 2Be the inductance value of the first inductor L2, C 2It is the capacitance of the first capacitor C2;
The impedance of first filter unit 1 is:
Figure BDA00001619473000043
The impedance of second filter unit 2 is:
Figure BDA00001619473000044
Wherein, R 1Be the resistance value of first resistor R 1, R 2Be the resistance value of second resistor R 2, j representes the imaginary part in the vector.
The wind turbine generator filter circuit impedance characteristic sketch map that Fig. 2 provides for the utility model embodiment one; As shown in Figure 2; For obtaining two best composite impedance characteristics in filter unit combination back; Series loop is overlapped with the resonant frequency point of shunt circuit, and the value of each electric capacity and inductance need satisfy:
Figure BDA00001619473000045
Then the curve abscissa among Fig. 2 is first filter unit 1 and second filter unit 2 resonance frequency after compound, and ordinate is the impedance of two filter circuits after the filter units combination; Impedance curve among the figure is the composite curve that obtains after being intersected by series impedance characteristic curve and parallel impedance characteristic curve, and part capacitive reactances and emotional resistance in the impedance operator are cancelled out each other, and produce two new resonance point ω 1' and ω 2', this composite impedance of 2 is lower.
Can confirm that through actual detection the single-phase voltage current signal of wind-powered electricity generation unit outlet is at two low frequency point ω 1And ω 2Place's harmonic wave is higher, can be through on the wind-powered electricity generation unit is single-phase, installing the next filtering simultaneously of the filter circuit ω that present embodiment provides additional 1And ω 2The harmonic wave at place.Make two new resonance point ω of filter circuit 1' and ω 2' and definite ω 1And ω 2Frequency overlaps, because this composite impedance of 2 is lower, can make ω 1And ω 2The low-frequency harmonics electric current at two places flows to this filter circuit smoothly, and the electric current of other high frequency frequency parts can't pass through this filter circuit, thereby continues to inject to electrical network, has realized the filtering purpose to low-frequency harmonics.
Fig. 3 is not for installing the low-frequency harmonics curve chart of the wind turbine generator filter circuit that the utility model embodiment one provides additional; Fig. 4 is the low-frequency harmonics curve chart that installs the wind turbine generator filter circuit that the utility model embodiment one provides additional.Like Fig. 3 and shown in Figure 4, before installing the filter circuit that present embodiment provides additional, there are two humorous wave points in low-frequency range; Install additional after this filter circuit, the harmonic pollution of low-frequency range improves.
The concrete parameter designing of above-mentioned filter circuit is following:
The value of the first capacitor C1 is:
Figure BDA00001619473000051
The value of the first inductor L1 is:
Figure BDA00001619473000052
The value of the second capacitor C2 is:
Figure BDA00001619473000053
The value of the second inductor L2 is:
Figure BDA00001619473000054
Wherein, ω 1And ω 2Be respectively the frequency of two place's low-frequency harmonics of preset hope filtering, ω The workerBe the fundamental frequency frequency, Q is the fundamental wave reactive power power of this filter circuit compensation, and U is the voltage of this filter circuit, and wherein, the value of U is confirmed, is the output voltage of wind-driven generator.
Because filter circuit mainly is to be connect by capacitor and inductor series and parallel to form; The inner capacitive load of filter circuit can be carried out reactive power compensation to circuit; Inductive load can absorb harmonic current, improves the aberration rate of circuit, and energy can exchange each other in two kinds of loads.
In addition, in the parameter designing of above-mentioned filter circuit, main what consider is capacitor and the resonance between the inductor in series loop and the shunt circuit.And resonance is when taking place in two loops, and first resistor R 1 and second resistor R 2 are often ignored.But still can select resistance value based on two circuit's principle of above-mentioned filter circuit.The impedance of series loop | Z String| be much larger than the impedance of shunt circuit | Z And|, in whole loop, to bear most of voltage dividing potential drop, satisfy so get first resistor and second resistor: R 1>R 2In the shunt circuit, get R2 and level off to zero, can improve the quality factor of shunt circuit.
The wind turbine generator filter circuit that the utility model embodiment one provides utilizes first filter unit and two resonance frequencys of second filter unit formation to absorb two bigger place's harmonic waves of power network fluctuation influence; Effectively improve the fluctuation and the flickering phenomenon of voltage, improved the quality of power supply of generating electricity by way of merging two or more grid systems.
Embodiment two
The phase structure sketch map of the wind turbine generator electricity generation system that Fig. 5 provides for the utility model embodiment two; The utility model embodiment two provides a kind of wind turbine generator electricity generation system; It comprises wind turbine generator 3 and transformer group, and wherein, this electricity generation system also comprises the wind turbine generator filter circuit that the utility model any embodiment provides; One end of this filter circuit links to each other other end ground connection respectively with the input of the generator output end of wind turbine generator and transformer group.
Preferably; Above-mentioned transformer group comprises that grade is that first step-up transformer 4 and the grade of 0.69/35KV is that second step-up transformer, 5, the first step-up transformers 4 and second step-up transformer 5 of 35/110KV is connected between the output and electrical network of generator through cable.
Wind turbine generator generating, the electric current of generation is sent to first step-up transformer 4 and boosts to 35KV after the filter circuit filtering harmonic, be sent to after second step-up transformer 5 boosts to 110KV through cable, to the electrical network injection current again.
The three-phase structure sketch map of the wind turbine generator electricity generation system that Fig. 6 provides for the utility model embodiment two; When wind-driven generator is three phase electric machine; Because all there is the phenomenon of low-frequency harmonics in the three-phase voltage current signal of wind-powered electricity generation unit output; So the utility model embodiment all installs the consistent filter circuit of design parameter additional at three-phase output signal place, connect one to one with three outputs of generator, connect method with Y and be connected to ground; This connects method can avoid single-phase short trouble over the ground, can avoid owing to the breakdown phase fault that causes of a certain capacitor of going up mutually simultaneously.
The utility model embodiment two is provided with filter circuit through the outlet side at the wind-powered electricity generation unit, avoided low-frequency harmonics that the wind-powered electricity generation unit produces through follow-up transformer with the phenomenon that harmonic signal amplifies gradually, reduced the flickering pollution, improved the quality of power supply.
What should explain at last is: above embodiment is only in order to the technical scheme of explanation the utility model, but not to its restriction; Although the utility model has been carried out detailed explanation with reference to previous embodiment; Those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the scope of each embodiment technical scheme of essence disengaging the utility model of relevant art scheme.

Claims (7)

1. a wind turbine generator filter circuit is characterized in that: comprise first filter unit and second filter unit of mutual serial connection, wherein
Said first filter unit is formed by first capacitor, first inductor and first resistor in series;
Said second filter unit is formed in parallel with second capacitor after by second inductor and second resistor in series;
Said second resistor, first capacitor, second capacitor, the value of first inductor and second inductor satisfies following condition:
R 2<1 ohm;
1 / L 1 C 1 = 1 / L 2 C 2 ;
Wherein, C 1Be the capacitance of first capacitor, L 1Be the inductance value of first inductor, C 2Be the capacitance of second capacitor, L 2It is the inductance value of second inductor; R 2It is the resistance value of second resistor.
2. wind turbine generator filter circuit according to claim 1 is characterized in that, the value of said first capacitor is:
Figure FDA00001619472900012
The value of said first inductor is:
Figure FDA00001619472900013
Wherein, ω 1And ω 2Be respectively the frequency of two place's low-frequency harmonics, ω The workerBe the fundamental frequency frequency, Q is the fundamental wave reactive power power of said filter circuit compensation, and U is the voltage of said filter circuit.
3. wind turbine generator filter circuit according to claim 1 is characterized in that, the value of said second capacitor is:
Figure FDA00001619472900014
The value of said second inductor is:
Wherein, ω 1And ω 2Be respectively the frequency of two place's low-frequency harmonics, ω The workerBe the fundamental frequency frequency, Q is the fundamental wave reactive power power of said filter circuit compensation, and U is the voltage of said filter circuit.
4. according to the arbitrary described wind turbine generator filter circuit of claim 1-3, it is characterized in that the value of said first resistor and second resistor satisfies: R 1>R 2, wherein, R 1Be the resistance value of first resistor, R 2It is the resistance value of second resistor.
5. wind turbine generator electricity generation system; Comprise wind turbine generator and transformer group; It is characterized in that: said electricity generation system also comprises the arbitrary described wind turbine generator filter circuit of claim 1-4; One end of said filter circuit links to each other respectively with the input of the generator output end of said wind turbine generator and transformer group, the other end ground connection of said filter circuit.
6. wind turbine generator electricity generation system according to claim 5; It is characterized in that; Said transformer group comprises that grade is first step-up transformer of 0.69/35KV and second step-up transformer that grade is 35/110KV, and said first step-up transformer and second step-up transformer are connected between the output and electrical network of said generator through cable.
7. according to claim 5 or 6 described wind turbine generator electricity generation systems; It is characterized in that: said generator has three outputs; Said electricity generation system comprises three groups of said wind turbine generator filter circuits, and three groups of said filter circuits and said three outputs connect one to one.
CN2012202084224U 2012-05-09 2012-05-09 Wind generating set filter circuit and power generation system Expired - Fee Related CN202602291U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106787647A (en) * 2017-01-04 2017-05-31 四川埃姆克伺服科技有限公司 A kind of passive filter circuit
CN110247426A (en) * 2019-06-12 2019-09-17 国网山西省电力公司电力科学研究院 A kind of robust Unit Combination method based on the uncertain set of multiband
CN113287255A (en) * 2019-08-06 2021-08-20 东芝三菱电机产业系统株式会社 Power conversion system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106787647A (en) * 2017-01-04 2017-05-31 四川埃姆克伺服科技有限公司 A kind of passive filter circuit
CN110247426A (en) * 2019-06-12 2019-09-17 国网山西省电力公司电力科学研究院 A kind of robust Unit Combination method based on the uncertain set of multiband
CN110247426B (en) * 2019-06-12 2022-09-06 国网山西省电力公司电力科学研究院 Robust set combination method based on multi-band uncertain set
CN113287255A (en) * 2019-08-06 2021-08-20 东芝三菱电机产业系统株式会社 Power conversion system
CN113287255B (en) * 2019-08-06 2023-11-28 东芝三菱电机产业系统株式会社 Power conversion system

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