CN201869106U - Double-feed wind power frequency converter - Google Patents
Double-feed wind power frequency converter Download PDFInfo
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- CN201869106U CN201869106U CN2010206377418U CN201020637741U CN201869106U CN 201869106 U CN201869106 U CN 201869106U CN 2010206377418 U CN2010206377418 U CN 2010206377418U CN 201020637741 U CN201020637741 U CN 201020637741U CN 201869106 U CN201869106 U CN 201869106U
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Abstract
The utility model relates to a frequency converter, in particular to a double-feed wind power frequency converter which solves the problem that a large-power double-feed wind power frequency converter has no low voltage ride through function. The double-feed wind power frequency converter comprises a filter circuit, a rectifying circuit including an IGBT (Insulated Gate Bipolar Transistor), an inversion circuit and a control unit for controlling the rectifying circuit and the inversion circuit, wherein an AC (alternating current) output end of the inversion circuit is connected with the rectifying circuit consisting of diodes, a DC (direct current) output loop of the rectifying circuit consisting of the diodes is connected with a thyristor and four parallel branches each of which comprises a resistor and the IGBT that are connected in series; and a signal acquisition input end of the control unit is connected with a DC output end of the rectifying circuit including the IGBT, and a control signal output end of the control unit is respectively connected with the thyristor and trigger control ends of the IGBTs in the parallel branches. The low voltage ride through function of the frequency converter is realized so as to fill a blank that the double-feed wind power frequency converter in China has no low voltage ride through function under the power grade.
Description
Technical field
The utility model relates to frequency converter, is specially a kind of double-fed wind-powered electricity generation frequency converter.
Background technology
In today of rapid economic development, the lack of energy problem has been the significant problem that the mankind face, the development and utilization regenerative resource is significant for the improvement of environment for human survival, regenerative resource comprises solar energy, wind energy and biomass energy etc., and wind energy wherein is the renewable free of contamination new forms of energy that tool large-scale develops and utilizes prospect.
For the requirement of existing national grid and each wind field, frequency converter must have low pressure to pass through function can the on-hook operation.So-called low pressure is passed through function and is required exactly externally under the electric network fault, and wind-driven generator has the ability of running without interruption, and such as under the disturbance of voltage collapse, generator can not be from off-the-line on the electrical network, in order to avoid cause bigger subsequent perturbations and more serious fault.
At present, double-fed wind-powered electricity generation frequency converter is a main flow with the 1.5MW power grade mainly on the market, but the direction of wind power generation is to increase the energy output of wind field in the wind resource peak period, reduce the actual motion cost of wind-powered electricity generation unit, improve unit generation efficient, in order to satisfy this demand, more powerful now 3MW motor arises at the historic moment.But the frequency converter of 3MW does not also possess low pressure passes through function.
Summary of the invention
The utility model solves big power and doube-feedback wind-powered electricity generation frequency converter and does not possess the problem that low pressure is passed through function, and a kind of double-fed wind-powered electricity generation frequency converter that low pressure is passed through function that has is provided.
The utility model is to adopt following technical scheme to realize: double-fed wind-powered electricity generation frequency converter, the control unit U4 that comprises filter circuit U1, contains the rectification circuit U2 of IGBT and inverter circuit U3 and rectification circuit and inverter circuit are implemented control, the ac output end of inverter circuit U3 is connected with the rectification circuit U5 that is made of diode, and the direct current output loop of the rectification circuit U5 that is made of diode is connected with thyristor T1 and four parallel branches that formed by resistance R 2-R4, IGBT T2-T4 serial connection respectively; The signals collecting input of control unit U4 links to each other with the dc output end (dc bus) of the rectification circuit U2 that contains IGBT, and the control signal output ends of control unit U4 links to each other with the trigger control end of IGBT T2-T4 in thyristor T1 and each parallel branch respectively.During work, exchange the 690V line voltage after filtration behind the wave circuit U1, enter rectification circuit U2 and inverter circuit U3, realize the AC-DC-AC conversion, then to generator amature for the alternating voltage about 400V.When line voltage broke down, during as the line voltage bust, the power that generator sends can not in time be sent, and caused stator side to produce very big fault current.Because the close coupling between the stator and rotor, fault current is passed to rotor-side immediately; Because voltage collapse causes electromagnetic torque to diminish, the operation slippage increases again, and the power of feed-in rotor is increased, and further causes the overvoltage and the overcurrent of rotor loop.Rotor energy is flowed through behind the inverter circuit, and a part is delivered to electrical network by rectification circuit, and remaining charges for dc-link capacitance, causes busbar voltage to raise fast.If the untimely safeguard measure of taking, stator and rotor winding only depend on self-resistance and leakage reactance to be not enough to suppress surge current, excessive electric current and voltage will cause the rotor winding of frequency converter, motor to damage.In this system, control unit U4 collects this voltage rising signal, control thyristor T1 conducting, and control inverter circuit U3 quits work, control unit U4 is under the support of corresponding software simultaneously, the IGBT that triggers in the corresponding parallel branch according to the size of the different situations of electric network fault and rotor electric current drops into different resistance, as in the firm incipient stage, after serious symmetrical voltage takes place and falls fault in electrical network, for surpassing under the situation of threshold value in the unlikely DC bus-bar voltage that causes, the value of having high input brake resistance is to suppress instantaneous voltage, rush of current.After escaping serious impact (about 3-4 electrical network cycle), reduce the brake resistance resistance rapidly, to accelerate the electromagnetic transition process, the harm of concussion when making parts avoid long.Like this, with brake resistance with the rotor short circuit, i.e. short circuit rotor winding, this moment double-fed generator just as same squirrel-cage asynchronism generator, when power system restoration just often, control unit U4 excises brake resistance again, makes double feedback electric engine recover operate as normal.From the above-mentioned course of work as can be seen, the effect of control unit U4 is outside the routine control that realizes rectification circuit and inverter circuit, by detection to DC bus-bar voltage, realize in good time the IGBT in thyristor, each parallel branch and the control of inverter circuit, realize that low pressure passes through function.The circuit structure of realizing the control unit of above-mentioned functions is to realize easily to affiliated art, and multiple circuit structure modification can easily be arranged.
Filter circuit described in the utility model is the LCL filter circuit, be that described filter circuit is made of six inductance L 1 that are serially connected with every phase in twos, L2 and three capacitor C that are connected 1 triangular in shape, C2, C3, three bight nodes that the triangle of three electric capacity formation connects link to each other with the intermediate node that is serially connected with every two inductance mutually respectively; In order to prevent that the LCL filter circuit from producing resonance, the utility model is serially connected with damping resistance respectively between three bight nodes that the triangle that three electric capacity forms connects and the intermediate node that is serially connected with every two inductance mutually in the LCL filter circuit.
Double-fed wind-powered electricity generation frequency converter described in the utility model is by setting up the related circuit structure, realized that the low pressure of frequency converter passes through function, fill up domestic high-power double-fed fan motor frequency converter and do not had the blank that low pressure is passed through function, improve the operational efficiency and the reliability of wind-powered electricity generation unit, increased the economic benefit of wind field simultaneously.The utility model circuit structure design is reasonable, novel, security of operation, reliable.
Description of drawings
Fig. 1 is the electrical schematic diagram of double-fed wind-powered electricity generation frequency converter described in the utility model.
TA1-TA9 and TV1-TV6 are respectively electric current and voltage sensor among the figure, and the electric current and the voltage signal that collect enter control unit; QF1 is a circuit breaker, i.e. the motor switch that is incorporated into the power networks; KM1, KM2 are air switch, are used for combined floodgate and charging control to main circuit and auxiliary circuit; FU1, FU2 are fuse, and main circuit is shielded, and mainly are to prevent that electric current is excessive in the main circuit.
Embodiment
Double-fed wind-powered electricity generation frequency converter, the control unit U4 that comprises filter circuit U1, contains the rectification circuit U2 of IGBT and inverter circuit U3 and rectification circuit and inverter circuit are implemented control, the ac output end of inverter circuit U3 is connected with the rectification circuit U5 that is made of diode, and the direct current output loop of the rectification circuit U5 that is made of diode is connected with thyristor T1 and four parallel branches that formed by resistance R 2-R4, IGBT T2-T4 serial connection respectively; The signals collecting input of control unit U4 links to each other with the dc output end (dc bus) of the rectification circuit U2 that contains IGBT, and the control signal output ends of control unit U4 links to each other with the trigger control end of IGBT T2-T4 in thyristor T1 and each parallel branch respectively.Described filter circuit is the LCL filter circuit, be that described filter circuit is made of six inductance L 1 that are serially connected with every phase in twos, L2 and three capacitor C that are connected 1 triangular in shape, C2, C3, three bight nodes that the triangle of three electric capacity formation connects link to each other with the intermediate node that is serially connected with every two inductance mutually respectively; In order to prevent that the LCL filter circuit from producing resonance, the utility model is serially connected with damping resistance respectively between three bight nodes that the triangle that three electric capacity forms connects and the intermediate node that is serially connected with every two inductance mutually in the LCL filter circuit.For improving heat radiation, described damping resistance is made of two resistance parallel with one another.
During concrete enforcement, drop into during for electric network fault choosing of resistance can not be excessive can not be too small, though excessive overvoltage, the overcurrent that can avoid the instantaneous generation of rotor winding side of resistance can cause that dc bus surpasses threshold value, damage rotor side inverter; Though the too small meritorious reactive power of motor, the DC bus-bar voltage of frequency converter of can making of brake resistance there is no big fluctuation, but can in motor stator and rotor winding, produce very big transient current, electromagnetic torque concussion amplitude is very big simultaneously, thus the safety that threatens rotor winding, motor bearings.In view of above reason, the utility model brake resistance adopts the resistance of the different resistances of level Four, drop into different resistance according to the different situations of electric network fault and the size of rotor electric current, as in the firm incipient stage, after serious symmetrical voltage takes place and falls fault in electrical network, for surpassing under the situation of threshold value in the unlikely DC bus-bar voltage that causes, the value of having high input brake resistance is to suppress instantaneous voltage, rush of current.After escaping serious impact (about 3-4 electrical network cycle), reduce the brake resistance resistance rapidly, to accelerate the electromagnetic transition process, the harm of concussion when making parts avoid long.Resistance R 2-R4 in this embodiment in each parallel branch chooses 3 ohm, 1.8 ohm, 0.6 ohm, 0.3 ohm respectively.Operation principle is: when line voltage rapid drawdown to 15%, drop into resistance this moment is 3 ohm brake resistance, to suppress excessive stator and rotor electric current, excise rotor side inverter simultaneously, the active power current-order is given as 0, after this again according to the difference of line voltage failure condition, drop into the brake resistance of different resistances.Behind fault recovery 50ms, the excision brake resistance, rotor side inverter is devoted oneself to work again, and double feedback electric engine is again with rated power operation.
For guaranteeing the reliability of control unit power supply, this frequency converter also comprises the power supply circuits of control unit, and power supply circuits are made of with the ups power that links to each other with the transformer output the transformer B1 that links to each other with line voltage.The 690V line voltage through transformer B1 transformation after, power to control circuit through ups power, guaranteeing when line voltage breaks down, the control unit reliably working of still delaying time is eliminated or the frequency converter off-grid until fault.
Claims (6)
1. double-fed wind-powered electricity generation frequency converter, the control unit U4 that comprises filter circuit U1, contains the rectification circuit U2 of IGBT and inverter circuit U3 and rectification circuit and inverter circuit are implemented control, the ac output end that it is characterized in that inverter circuit U3 is connected with the rectification circuit U5 that is made of diode, and the direct current output loop of the rectification circuit U5 that is made of diode is connected with thyristor T1 and four parallel branches that formed by resistance R 2-R4, IGBT T2-T4 serial connection respectively; The signals collecting input of control unit U4 links to each other with the dc output end of the rectification circuit U2 that contains IGBT, and the control signal output ends of control unit U4 links to each other with the trigger control end of IGBTT2-T4 in thyristor T1 and each parallel branch respectively.
2. double-fed wind-powered electricity generation frequency converter according to claim 1, it is characterized by: filter circuit is made of six inductance L 1 that are serially connected with every phase in twos, L2 and three capacitor C that are connected 1 triangular in shape, C2, C3, three bight nodes that the triangle that three electric capacity forms connects link to each other with the intermediate node that is serially connected with every two inductance mutually respectively, are serially connected with damping resistance respectively between three bight nodes that the triangle that three electric capacity forms connects and the intermediate node that is serially connected with every two inductance mutually.
3. double-fed wind-powered electricity generation frequency converter according to claim 2 is characterized by: damping resistance is made of two resistance parallel with one another.
4. according to claim 1 or 2 or 3 described double-fed wind-powered electricity generation frequency converters, it is characterized by: the resistance R 2-R4 in each parallel branch chooses 3 ohm, 1.8 ohm, 0.6 ohm, 0.3 ohm respectively.
5. according to claim 1 or 2 or 3 described double-fed wind-powered electricity generation frequency converters, it is characterized by: also comprise the power supply circuits of control unit, power supply circuits are made of with the ups power that links to each other with the transformer output the transformer B1 that links to each other with line voltage.
6. double-fed wind-powered electricity generation frequency converter according to claim 4 is characterized by: also comprise the power supply circuits of control unit, power supply circuits are made of with the ups power that links to each other with the transformer output the transformer B1 that links to each other with line voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206377418U CN201869106U (en) | 2010-12-02 | 2010-12-02 | Double-feed wind power frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206377418U CN201869106U (en) | 2010-12-02 | 2010-12-02 | Double-feed wind power frequency converter |
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| Publication Number | Publication Date |
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| CN201869106U true CN201869106U (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206377418U Expired - Lifetime CN201869106U (en) | 2010-12-02 | 2010-12-02 | Double-feed wind power frequency converter |
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| CN (1) | CN201869106U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064714A (en) * | 2010-12-02 | 2011-05-18 | 永济新时速电机电器有限责任公司 | Doubly-fed wind power frequency converter |
| CN102291085A (en) * | 2011-08-23 | 2011-12-21 | 东北电网有限公司 | Asynchronous motor frequency converter device with low-voltage ride through capability |
| CN105471339A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Asynchronous starting device of brushless doubly-fed machine |
| CN105471338A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Starting device of brushless doubly-fed machine |
-
2010
- 2010-12-02 CN CN2010206377418U patent/CN201869106U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064714A (en) * | 2010-12-02 | 2011-05-18 | 永济新时速电机电器有限责任公司 | Doubly-fed wind power frequency converter |
| CN102064714B (en) * | 2010-12-02 | 2013-04-10 | 永济新时速电机电器有限责任公司 | Doubly-fed wind power frequency converter |
| CN102291085A (en) * | 2011-08-23 | 2011-12-21 | 东北电网有限公司 | Asynchronous motor frequency converter device with low-voltage ride through capability |
| CN105471339A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Asynchronous starting device of brushless doubly-fed machine |
| CN105471338A (en) * | 2015-12-31 | 2016-04-06 | 易事特集团股份有限公司 | Starting device of brushless doubly-fed machine |
| CN105471339B (en) * | 2015-12-31 | 2018-11-23 | 易事特集团股份有限公司 | A kind of asynchronous starting device of brushless double-fed motor |
| CN105471338B (en) * | 2015-12-31 | 2019-02-05 | 易事特集团股份有限公司 | The starter of brushless double-fed motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110615 Effective date of abandoning: 20130410 |
|
| RGAV | Abandon patent right to avoid regrant |