CN102447263A - Doubly fed wind power generation control system on grid network fault condition and method thereof - Google Patents
Doubly fed wind power generation control system on grid network fault condition and method thereof Download PDFInfo
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- CN102447263A CN102447263A CN201010501452XA CN201010501452A CN102447263A CN 102447263 A CN102447263 A CN 102447263A CN 201010501452X A CN201010501452X A CN 201010501452XA CN 201010501452 A CN201010501452 A CN 201010501452A CN 102447263 A CN102447263 A CN 102447263A
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Abstract
The invention relates to doubly fed wind power generation control system on a grid network fault condition and a method thereof. The system comprises a doubly fed induction generator (DFIG), a stator excitation converter, a voltage hall sensor, a current hall sensor, a digital signal processor, and a Crowbar protection circuit. Besides, the method comprises the following steps that: (1), it is determined whether there is a voltage instant drop at a doubly fed generator end; (2), a software demagnetization method is employed calculate a modulating voltage of a rotor side converter; (3), according to a condition that whether the modulating voltage exceeds an amplitude limiting value, it is selected to carry out a step (5) or a step (4); (4), the modulating voltage of the rotor side converter is employed to carry out controlling on the rotor side converter; and (5), the Crowbar protection circuit is accessed to a rotor winding loop. Compared with the prior art, the technology employed in the invention enables the following beneficial effects to be realized: a rotor excitation converter can be effectively protected; low voltage ride though capability of a doubly fed wind power generation system on the grid network fault condition is improved; a topological structure of a grid network fault system can be optimized; and it is realized that a generator rapidly provides power support for the grid network.
Description
Technical field
The present invention relates to double feedback electric engine wind-driven power generation control system and method, double-fed wind generating control system and method when especially relating to a kind of electric network fault.
Background technology
Along with the continuous increase of wind-powered electricity generation installed capacity, between wind-powered electricity generation unit and the electrical network influence each other and the safe operation problem of grid connected wind power unit becomes the focus of concern.When research focus wherein is electric network fault, the not off-grid operation problem of wind-powered electricity generation unit, promptly low-voltage is passed through (Low Voltage Ride Though, LVRT) problem.Also the wind-powered electricity generation unit that generates electricity by way of merging two or more grid systems is proposed concrete low-voltage to this problem China national grid and passed through requirement.
Double-fed induction wind driven generator (Doubly Fed Induction Generator; DFIG) wind-power market occupancy volume is quite big; It is little that its advantage mainly contains the pwm converter capacity, power decoupled control etc., but little just because of its pwm converter capacity; Thereby very responsive to the disturbance of electric network fault, it is realized that low-voltage is passed through cause difficulty.Double fed induction generators low-voltage crossing problem main solution at present has: improve rotor-exciting convertor controls algorithm, like the demagnetization method of stator magnetic linkage, adopt the method for modern control theory etc.Another kind is the method that increases hardware topology, like Crowbar guard method based on hardware protection circuit, and series connection grid side converter etc.The low voltage ride-through capability of double-fed generator when the method for improvement control strategy and hardware protection has all improved electric network fault to a certain extent, but have deficiency separately.The simple method of improving control strategy is owing to the restriction that receives rotor-exciting converter capacity; Its low voltage ride-through capability is limited when line voltage significantly lands; And only increasing the method for Crowbar protective circuit because the access and the excision of circuit need the regular hour, very difficult realization provides the power support, helps power system restoration to electrical network fast.Dual feedback wind power generation system then is that problem to be solved is arranged in the prior art to mains supply when therefore when electric network fault, realizing electric network fault fast and effectively.
Summary of the invention
The object of the invention is exactly for the defective that overcomes above-mentioned prior art existence a kind of rotor-exciting converter of effectively protecting to be provided; Dual feedback wind power generation system low voltage ride-through capability when improving electric network fault is optimized the topological structure of electric network fault system and is realized generator double-fed wind generating control system and method when electrical network provides the electric network fault of power support fast.
The object of the invention can be realized through following technical scheme: double-fed wind generating control system during a kind of electric network fault; Comprise double-fed induction wind driven generator and rotor-exciting converter; Described double-fed induction wind driven generator comprises stator, rotor, threephase stator output, rotor winding terminal; Described rotor-exciting converter comprises rotor-side converter and grid side converter; Described threephase stator output is connected through the public tie point of electrical network with electrical network; Described rotor winding terminal is connected with the rotor-side converter, and described grid side converter is connected with the public tie point of electrical network, it is characterized in that; Also comprise voltage hall sensor, current Hall transducer, digital signal processor, Crowbar protective circuit; The input of described voltage hall sensor is connected with the public tie point of electrical network, and the output of described voltage hall sensor is connected with digital signal processor, and the input of described current Hall transducer is connected with the rotor winding terminal; The output of described current Hall transducer is connected with digital signal processor; First output of described digital signal processor is connected with rotor-exciting converter input, and second output of described digital signal processor is connected with the switch control end of Crowbar protective circuit, and the input of described Crowbar protective circuit is connected with the rotor winding terminal.
The three-phase bridge circuit that described rotor-side converter constitutes for the IGBT power tube.
This method may further comprise the steps: 1) digital signal processor is according to the detected line voltage of voltage hall sensor; Whether wink falls to judge line voltage; As to be judged as be then carry out step 2); As be judged as otherwise by double-fed generator vector operation control double-fed generator, digital signal processor rejudges line voltage, and whether wink falls; 2) digital signal processor calculates rotor-side converter modulation voltage according to the rotor current of current Hall sensor acquisition; 3) judge whether rotor-side converter modulation voltage exceeds amplitude limit value, as to be judged as be then to carry out step 5), as be judged as otherwise carry out step 4); 4) break off the Crowbar protective circuit, digital signal processor is according to step 2) the rotor-side converter modulation voltage that draws controls the rotor-side converter, returns step 1) simultaneously; 5) block rotor-side converter pulses signal, the Crowbar protective circuit is inserted the rotor winding loop, return step 3) simultaneously and judge whether rotor-side converter modulation voltage exceeds amplitude limit value.
Described step 2) the concrete computational methods that calculate rotor-side converter modulation voltage in do, the three-phase rotor current is carried out the synchronously rotating reference frame conversion, obtain d, the q axle component i of synchronous rotating frame lower rotor part electric current
RdAnd i
RqWhen trying to achieve rotor current rotational component and electrical network unbalanced fault through filtering method then the rotor current negative sequence component and i
Rd ψ, i
Rq ψ, with rotor current set-point i
Rd *, i
Rq *Deduct i respectively
Rd ψ, i
Rq ψThe value i that obtains
Rd', i
Rq' as new rotor current set-point, with i
Rd', i
Rq' respectively with rotor current i
Rd, i
RqAfter subtracting each other, obtain the rotor-side converter modulation voltage through the PI adjusting.
Compared with prior art; The control mode that the present invention adopts the Crowbar hardware circuit to combine with control strategy; Effectively protected the rotor-exciting converter; Dual feedback wind power generation system low voltage ride-through capability when having improved electric network fault has been optimized the topological structure of electric network fault system, has realized that generator provides the power support fast to electrical network.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a flow chart of the present invention.
1 is that doubly fed induction generator, 2 is that rotor-exciting converter, 3 is that rotor-side converter, 4 is that grid side converter, 5 is that voltage hall sensor, 6 is that current Hall transducer, 7 is that digital signal processor, 8 is the Crowbar protective circuit among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment
As shown in Figure 1; Double-fed wind generating control system during a kind of electric network fault; Comprise double-fed induction wind driven generator 1 and rotor-exciting converter 2; Wherein rotor-exciting converter 2 comprises rotor-side converter 3 and grid side converter 4 two parts again; On the public tie point PCC of the threephase stator output of double-fed induction wind driven generator 1 and electrical network voltage hall sensor 5 is installed; The rotor winding terminal of double-fed induction wind driven generator 1 is installed current Hall transducer 6, and the rotor winding connects Crowbar protective circuit 8, receives the signal that voltage hall sensors 5 and current Hall transducer 6 transmit by a digital signal processor 7; And calculate and then export control signal and control rotor-exciting converter 2 and rotor Crowbar protective circuit 8; The voltage that digital signal processor 7 is gathered according to voltage hall sensor 5 carries out falling in line voltage wink (drop in this example stable operation voltage 20%) to be judged, and the current signal that current Hall transducer 6 is gathered carries out the synchronously rotating reference frame conversion, and the rotor current negative sequence component leaches when rotor current rotational component that induces in the double fed induction generators rotor when afterwards line voltage wink being fallen and electrical network unbalanced fault; After rotor current rotational component and negative sequence component oppositely added the rotor current set-point; Rotor current as new is given, is calculated by digital signal processor 7 and generates modulation voltage control rotor-side converter 3, controls the access and the excision of Crowbar circuit 8 through the size of judging modulation voltage.If modulation voltage is greater than maximum limiting voltage (limiting voltage is confirmed according to factors such as generator power and electric machine structures); Then block rotor-side converter 3 pulse signals, and rotor Crowbar protective circuit 8 is inserted, make the rotor winding form short-circuit condition through the Crowbar circuit; When modulation voltage during less than amplitude limit value; Crowbar protective circuit 8 is broken off from rotor, remove 3 pulse blockings of rotor-side converter, and control with modulation voltage again.Described digital signal processor 7 is through modulation algorithm module output modulation signal.Rotor-side converter 3 constitutes three-phase bridge circuit by the IGBT power tube to be realized.
The voltage that digital signal processor 7 is gathered according to voltage hall sensor 5 carries out line voltage wink and falls judgement, if judging voltage wink falls, the generation step of above-mentioned rotor-side converter modulation voltage is following:
Step S101 utilizes voltage hall sensor detection of grid voltage, when detecting when falling in line voltage wink, and execution in step S102, otherwise by double-fed generator vector operation control double-fed generator, digital signal processor rejudges line voltage, and whether wink falls.
Step S102 adopts the software demagnetization method to calculate rotor-side converter modulation voltage, promptly the three-phase rotor current is carried out the synchronously rotating reference frame conversion, obtains d, the q axle component i of synchronous rotating frame lower rotor part electric current
RdAnd i
RqAnd when utilizing filtering method to obtain rotor current rotational component and electrical network unbalanced fault the rotor current negative sequence component and i
Rd ψ, i
Rq ψ, with rotor current set-point i
Rd *, i
Rq *Deduct i respectively
Rd ψ, i
Rq ψThe value i that obtains
Rd', i
Rq' as new rotor current set-point, with i
Rd', i
Rq' respectively with rotor current i
Rd, i
RqAfter subtracting each other, obtain the rotor-side converter modulation voltage through the PI adjusting.
Whether step S103 determining step S102 rotor side converter modulation voltage exceeds amplitude limit value, if exceed amplitude limit value, then execution in step S105 if do not exceed amplitude limit value, then carries out step S104.
Step S104 continues to carry out rotor-side converter control with the rotor-side converter modulation voltage among the step S102.
Step S105 blocks the rotor-side converter pulse signal, and the Crowbar protective circuit is inserted the rotor winding loop, judges whether the rotor-side converter modulation voltage surpasses amplitude limit value; If exceed amplitude limit value; Then keep the state among the step S105,, then break off the Crowbar protective circuit if less than amplitude limit value; Remove the blockade of rotor-side converter pulse signal, carry out rotor-side converter control with the rotor-side converter modulation voltage among the step S102.
Claims (4)
1. double-fed wind generating control system during an electric network fault; Comprise double-fed induction wind driven generator and rotor-exciting converter; Described double-fed induction wind driven generator comprises stator, rotor, threephase stator output, rotor winding terminal; Described rotor-exciting converter comprises rotor-side converter and grid side converter, and described threephase stator output is connected through the public tie point of electrical network with electrical network, and described rotor winding terminal is connected with the rotor-side converter; Described grid side converter is connected with the public tie point of electrical network; It is characterized in that, also comprise voltage hall sensor, current Hall transducer, digital signal processor, Crowbar protective circuit, the input of described voltage hall sensor is connected with the public tie point of electrical network; The output of described voltage hall sensor is connected with digital signal processor; The input of described current Hall transducer is connected with the rotor winding terminal, and the output of described current Hall transducer is connected with digital signal processor, and first output of described digital signal processor is connected with rotor-exciting converter input; Second output of described digital signal processor is connected with the switch control end of Crowbar protective circuit, and the input of described Crowbar protective circuit is connected with the rotor winding terminal.
2. the double-fed wind generating control system is characterized in that described rotor-side converter is the three-phase bridge circuit that the IGBT power tube constitutes during a kind of electric network fault according to claim 1.
3. double-fed wind generating control method during an electric network fault is characterized in that this method may further comprise the steps:
1) digital signal processor is according to the detected line voltage of voltage hall sensor; Whether wink falls to judge line voltage; As to be judged as be then carry out step 2); As be judged as otherwise by double-fed generator vector operation control double-fed generator, digital signal processor rejudges line voltage, and whether wink falls;
2) digital signal processor calculates rotor-side converter modulation voltage according to the rotor current of current Hall sensor acquisition;
3) judge whether rotor-side converter modulation voltage exceeds amplitude limit value, as to be judged as be then to carry out step 5), as be judged as otherwise carry out step 4);
4) break off the Crowbar protective circuit, digital signal processor is according to step 2) the rotor-side converter modulation voltage that draws controls the rotor-side converter, returns step 1) simultaneously;
5) block rotor-side converter pulses signal, the Crowbar protective circuit is inserted the rotor winding loop, return step 3) simultaneously and judge whether rotor-side converter modulation voltage exceeds amplitude limit value.
4. double-fed wind generating control method during a kind of electric network fault according to claim 3; It is characterized in that; Described step 2) the concrete computational methods that calculate rotor-side converter modulation voltage in do; The three-phase rotor current is carried out the synchronously rotating reference frame conversion, obtain d, the q axle component i of synchronous rotating frame lower rotor part electric current
RdAnd i
RqWhen trying to achieve rotor current rotational component and electrical network unbalanced fault through filtering method then the rotor current negative sequence component and i
Rd ψ, i
Rq ψ, with rotor current set-point i
Rd *, i
Rq *Deduct i respectively
Rd ψ, i
Rq ψThe value i that obtains
Rd', i
Rq' as new rotor current set-point, with i
Rd', i
Rq' respectively with rotor current i
Rd, i
RqAfter subtracting each other, obtain the rotor-side converter modulation voltage through the PI adjusting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010501452XA CN102447263A (en) | 2010-10-08 | 2010-10-08 | Doubly fed wind power generation control system on grid network fault condition and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010501452XA CN102447263A (en) | 2010-10-08 | 2010-10-08 | Doubly fed wind power generation control system on grid network fault condition and method thereof |
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| CN102447263A true CN102447263A (en) | 2012-05-09 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683252A (en) * | 2012-09-07 | 2014-03-26 | 通用电气公司 | Method and systems for operating a wind turbine using dynamic braking in response to a grid event |
| CN105634014A (en) * | 2016-03-03 | 2016-06-01 | 甘肃省电力公司风电技术中心 | Dynamic voltage restorer-based double-fed asynchronous wind generator unit control method |
| CN107482685A (en) * | 2017-10-11 | 2017-12-15 | 许昌学院 | A kind of double-fed fan motor unit fault processing system and set structure |
| CN108512059A (en) * | 2018-05-16 | 2018-09-07 | 河南森源电气股份有限公司 | Switch board |
| CN108711883A (en) * | 2018-05-24 | 2018-10-26 | 国家电网公司 | Coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system |
| CN113991734A (en) * | 2021-10-26 | 2022-01-28 | 中国华能集团清洁能源技术研究院有限公司 | Double-fed wind turbine generator control system and method with high voltage ride through capability |
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| CN1784823A (en) * | 2003-05-02 | 2006-06-07 | 克桑特雷克斯技术有限公司 | Control system for doubly fed induction generator |
| WO2010045964A1 (en) * | 2008-10-20 | 2010-04-29 | Woodward Seg Gmbh & Co. Kg | Protection system of a doubly-fed induction machine |
| CN101710715A (en) * | 2009-11-26 | 2010-05-19 | 上海大学 | System and method for controlling low voltage ride through of double-feed induction wind driven generator in power grid voltage instantaneous drop |
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2010
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Patent Citations (3)
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| CN1784823A (en) * | 2003-05-02 | 2006-06-07 | 克桑特雷克斯技术有限公司 | Control system for doubly fed induction generator |
| WO2010045964A1 (en) * | 2008-10-20 | 2010-04-29 | Woodward Seg Gmbh & Co. Kg | Protection system of a doubly-fed induction machine |
| CN101710715A (en) * | 2009-11-26 | 2010-05-19 | 上海大学 | System and method for controlling low voltage ride through of double-feed induction wind driven generator in power grid voltage instantaneous drop |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683252A (en) * | 2012-09-07 | 2014-03-26 | 通用电气公司 | Method and systems for operating a wind turbine using dynamic braking in response to a grid event |
| CN103683252B (en) * | 2012-09-07 | 2019-05-07 | 通用电气公司 | The method and system of blower is operated using dynamic brake for responsive electricity grid event |
| CN105634014A (en) * | 2016-03-03 | 2016-06-01 | 甘肃省电力公司风电技术中心 | Dynamic voltage restorer-based double-fed asynchronous wind generator unit control method |
| CN105634014B (en) * | 2016-03-03 | 2017-10-31 | 甘肃省电力公司风电技术中心 | Dual-feed asynchronous wind power generator group control method based on dynamic voltage compensator |
| CN107482685A (en) * | 2017-10-11 | 2017-12-15 | 许昌学院 | A kind of double-fed fan motor unit fault processing system and set structure |
| CN107482685B (en) * | 2017-10-11 | 2024-01-16 | 许昌学院 | Double-fed wind turbine generator system fault handling system and unit structure |
| CN108512059A (en) * | 2018-05-16 | 2018-09-07 | 河南森源电气股份有限公司 | Switch board |
| CN108512059B (en) * | 2018-05-16 | 2024-03-26 | 河南森源电气股份有限公司 | Control cabinet |
| CN108711883A (en) * | 2018-05-24 | 2018-10-26 | 国家电网公司 | Coordinate fault traversing method of the wind power plant through flexible DC power transmission grid-connected system |
| CN108711883B (en) * | 2018-05-24 | 2020-07-03 | 国家电网公司 | Coordinated fault ride-through method for wind power plant through flexible direct current power transmission grid-connected system |
| CN113991734A (en) * | 2021-10-26 | 2022-01-28 | 中国华能集团清洁能源技术研究院有限公司 | Double-fed wind turbine generator control system and method with high voltage ride through capability |
| CN113991734B (en) * | 2021-10-26 | 2023-09-01 | 中国华能集团清洁能源技术研究院有限公司 | Doubly-fed wind turbine generator control system and method with high voltage ride through capability |
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Application publication date: 20120509 |