CN101667802B - Wind power generation method for stator double-winding asynchronous generator power generation system in high wind speed range - Google Patents
Wind power generation method for stator double-winding asynchronous generator power generation system in high wind speed range Download PDFInfo
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Abstract
The invention relates to a wind power generation method for a stator double-winding asynchronous generator power generation system in a high wind speed range. The system comprises a stator double-winding asynchronous generator (1), a filter inductor (2), a control convertor (3), a rectifying bridge (4), an excitation capacitor (5), an output inverter (15), a small-capacity storage battery (6), a diode (7), a current sensor (8), a voltage sensor (9), a voltage sensor (10), a voltage sensor (11), a digital signal processor control plate (12) and a control convertor drive circuit (13), wherein the direct current bus output voltage of the control convertor (3) at the control winding side is connected with a directly rectified power winding output direct current bus by the diode (7). The power generation system can output electric energy in a high wind speed area by a power winding through a rectifying bridge and output electric energy in a low wind speed area by the voltage pumping principle from the control winding through the control convertor, thereby utilizing wind energy at maximum in the low wind speed area. The method applied to wind power generation can widen the wind energy utilization range of the power generation system and realize the capture of the wind energy in the high wind speed range.
Description
Technical field
Involved in the present invention is a kind of control and the method for designing that can carry out the asynchronous motor power generation system of stator duplex winding of wind power generation in wide wind speed range
Background technology
Global energy shortage has greatly promoted the development of regenerative resources such as wind power generation, and the scale of wind energy turbine set is increasing.But in this evolution, land wind energy turbine set construction has run into new problems such as land occupation and environmental protection.And marine wind electric field has the wind speed height away from land, and the quiet wind phase is seldom arranged, and can increase by 50% advantage than land wind energy turbine set energy output.Therefore marine wind electric field develops over past ten years rapidly.Marine wind electric field makes power transmission and distribution cost raising, difficult in maintenance away from big electrical network.In order to solve these difficulties, the high voltage permanent synchro wind generator that ABB AB in 1998 has adopted to have brushless structure in Sweden's marine wind electric field demonstration project, every generator output end is transformed to high voltage direct current through rectifying device, uses dc bus to carry out current collection and conveying then.As seen, the development of offshore wind farm has proposed the new approaches that the direct current current collection is carried to wind energy turbine set.The variable speed wind turbine system that is incorporated into the power networks at the direct current current collection in wind power generation, provides a kind of form of novelty with as shown in Figure 1 dual stator-winding induction generator (DWIG) system applies for the optional generator of offshore wind farm.
From domestic and foreign literature, still be in the starting stage for the dual stator-winding induction generator systematic research.Mainly feasibility, equivalent model, the two cover coil volume of DWIG are studied than problems such as design principle, the vibration of self-excitation excitation time-harmonic wave, excitation control strategy, dynamic characteristics, but these all are to be the research that prerequisite is carried out with the generator speed substantially constant.Before, the inventor is under the situation of variable-speed operation, the DWIG electricity generation system of power winding side band rectifier bridge load output dc voltage deep theory and experimental study have been carried out, disclosed the basic moving law of the dual stator-winding induction generator system of variable-speed operation, studies show that this system has good stable state and dynamic property, but these are all studied under high rotational speed, and the research of more slow-revving DWIG electricity generation system is not related to.Therefore, be necessary the control topological sum strategy of DWIG electricity generation system is studied and improved, further enlarge the range of speeds of its variable-speed operation, thereby make it can utilize the wind energy of low wind speed to generate electricity, this will expand the Wind Power Utilization scope of this electricity generation system, bring bigger economic and social benefit.
Summary of the invention
The objective of the invention is: overcome the dual stator-winding induction generator shown in Figure 1 deficiency that direct current forces down, Wind Power Utilization is limited in the power winding rectification output of low wind speed district, topological structure to the dual stator-winding induction generator system improves, the interior asynchronous motor power generation system of stator duplex winding topological structure that moves of a kind of new wide wind speed range is proposed, as shown in Figure 2, system is possessed in the ability of hanging down wind power generation under the wind speed, widened the Wind Power Utilization scope of this electricity generation system.
For achieving the above object, technical scheme of the present invention is to comprise major loop, low pressure small-power accessory power supply, detect loop and control loop.Major loop is made up of dual stator-winding induction generator 1, filter inductance 2, control change device 3, rectifier bridge 4, exciting capacity 5, diode 7 and output inverter 15; Low pressure small-power accessory power supply is made up of low capacity storage battery 6 and blocking diode; Detecting the loop is made up of current sensor 8 and voltage sensor 9,10,11; Control loop is made up of the drive circuit 13 of digital signal processor 12 and control change device.The dc bus output voltage of control winding side control change device 3 links to each other with the power winding output dc bus of direct rectification through diode 7.
The present invention is directed to this new topological structure that asynchronous motor power generation system of stator duplex winding proposed that is fit to operation in the wide wind speed range is: the turn ratio of two cover windings is reasonable in design, and the number of turn of promptly controlling winding is lower than the number of turn of power winding; The anode of the direct voltage of control winding side control change device output links to each other by the direct voltage anode of diode 7 with power winding side rectification output, and both negative terminals directly link to each other.In low wind speed zone, the rotating speed of generator is lower, and this makes that power winding output end voltage is also lower, does not reach command voltage after the rectification.The low-voltage electric energy that the control winding sends is controlled through the control change device, rise principle by voltage pump, the output dc voltage of control change device 3 can reach command voltage because of the pump effect of rising, and directly the power winding output dc voltage of rectification does not reach command voltage owing to rotating speed is low, rectifier bridge 4 is blocked naturally, the power winding is power output not, and generator sends power and exports around the dc bus of converter through control from control winding side.Along with the increase of wind speed, the rotating speed of generator rises, and power winding rectification output dc voltage raises, and when it reached command value, rectifier bridge 4 was open-minded, the output electric energy.Along with the further increase of wind speed, diode 7 ends, fully by power winding rectification output electric energy.In the high wind speed zone, the excitation reactive power of control change device regulator generator control winding makes the dc voltage stability of power winding rectification output.This system can be used in the grid system, also can pass through output inverter, is incorporated into the power networks after the direct current energy inversion with generator system output.
The new topological structure that the present invention proposes is compared with existing topological structure, and the maximum dc bus that is not both the control winding side converter output that will separate originally links to each other by diode with the dc bus of power winding rectification output.Former design Fig. 1, the control winding only provides generator required reactive power, and the control winding of Fig. 2 scheme not only will provide generator required reactive power in whole speed change varying load running, also will be from controlling the winding side through the converter active power of output when generator speed is low.Thus, although in low wind speed district, control winding and power winding output end voltage are all lower, but rise principle according to voltage pump, the output DC bus-bar voltage pump of control change device can be raised to command voltage, because this moment, this command voltage was higher than the direct voltage after the rectification of power winding, rectifier bridge is blocked, therefore, and under the low wind speed, the electric energy of generator output from the output of power winding side rectifier bridge, is not exported through the control change device and pass through the control winding.Along with the increase of wind speed, the rotating speed of generator rises, and the voltage of power winding rectification output increases, when it reaches command value, and rectifier bridge conducting, output electric energy.In the high wind speed zone, it is constant that the excitation reactive power of control change device adjusting Electric Machine Control winding is kept output dc voltage.Because control winding side dc bus links to each other by diode with power winding side dc bus, by rational control plan, can utilize wind energy to greatest extent in low wind speed district, this has widened the Wind Power Utilization scope of this electricity generation system.
Description of drawings
The existing asynchronous motor power generation system of stator duplex winding structured flowchart of Fig. 1
Fig. 2 is suitable for the asynchronous motor power generation system of stator duplex winding of wide wind speed range operation
Specific implementation method
Narrate the specific embodiment of the present invention, operation principle and the course of work with reference to the accompanying drawings:
The asynchronous motor power generation system of stator duplex winding of operation comprises the major loop that dual stator-winding induction generator 1, filter inductance 2, control change device 3, rectifier bridge 4, exciting capacity 5 are formed in the wide wind speed range of the present invention as shown in Figure 2; The low pressure small-power accessory power supply of forming by storage battery 6 and blocking diode; The detection loop of forming by current sensor 8 and voltage sensor 9,10 and 11; By digital signal processor 12 be connected to the control loop that the drive circuit 13 of control change device is formed.The switching tube of control change device can adopt IGBT or Intelligent Power Module (IPM).The purpose that the low capacity storage battery is installed at the control winding is, for system provides initial DC bus-bar voltage, rely on the control change device to provide excitation idle to generator, the output voltage of power winding and control winding is risen, when control winding DC bus-bar voltage surpasses the level of low pressure small-power accessory power supply, rely on diode to make storage battery nature detachment system, system builds and enters the generator operation state after pressure is finished.
The present invention proposes improved asynchronous motor power generation system of stator duplex winding, and its operation principle is described below:
When wind speed is higher, provide required excitation reactive power to generator jointly by control change device and exciting capacity, the alternating current of power winding output obtains direct current energy after rectification.The excitation reactive power of control change device regulator generator control winding makes power winding rectification output dc voltage keep constant.
Along with reducing of wind speed, control winding and power winding output end voltage reduce gradually, for holding power winding rectification output dc voltage constant, the control change device must increase the excitation reactive power, capacity until whole converter is used for exporting idle fully, reach its peaking capacity, at this moment the generator internal magnetic field is also slightly saturated, is in the state of encouraging by force.When wind speed further descends, just can not adopt the idle mode of regulator generator excitation to go holding power winding rectification output dc voltage to reach command value, at this moment want the conversion and control strategy, reduce the idle output of excitation of control change device, the saturation condition that generator is withdrawed from encourage by force, power winding rectification output dc voltage will be lower than command value like this.Control rises principle around side control change device by voltage pump, the output DC press pump of control change device is raised to command value, at this moment power side rectifier bridge is blocked naturally, and the power winding does not have electric energy output, and the electric energy that generator sends is exported through the control change device by the control winding.Although wind speed is low under the weak wind, the output end voltage of two cover windings of generator is also low, and behind the control change device, it can be raised to command value with control side converter output DC press pump.Because wind speed has been lower, because of wind energy becomes cubic relationship with wind speed, it is limited that generator sends electric energy, and it is enough fully that capacity accounts for the control change device of generator capacity about 1/3rd, and the range of speeds of generator work is widened greatly.Therefore, topological structure as shown in Figure 2 not only can be in the wide speed range stable operation of high wind speed district, and in low wind speed district, by certain control strategy, can make full use of the capacity of control change device,, expand low wind speed district's Wind Power Utilization ability by the generating of control winding.
The important feature that the present invention is different from existing systems topological structure (Fig. 1) is: in low wind speed district, by suitable control strategy, utilize the voltage pump Shengji art of control winding side converter to make the direct voltage of control winding outlet side reach command value, and the power winding is because the direct voltage after the output end voltage rectification is lower than this command value, rectifier bridge is blocked naturally, the power winding is not exported electric energy, the electric energy that generator sends through the output of control change device, can be widened low wind speed Wind Power Utilization ability by the control winding like this.In the high wind speed district, the control change device makes power winding rectification output dc voltage be stable at command value by the excitation reactive power of regulator generator control winding, and electric energy is exported through rectifier bridge by the power winding.
In sum, the running of wind power generation can be realized by following concrete steps in the wide wind speed range of asynchronous motor power generation system of stator duplex winding:
1) low wind speed district, by regulating the meritorious and reactive power of control change device, magnetic flux is maintained under the specified magnetic flux, because voltage pump rises principle, the direct voltage of control winding side control change device output is higher than the direct voltage of power winding side rectification output, at this moment rectifier bridge is blocked naturally, is equivalent to the power winding and throws off from dc bus, by controlling winding to DC bus powered.
2) low wind speed is to the high wind speed transient process.Along with the rising of rotating speed, the terminal voltage of power winding raises, and DC bus-bar voltage reaches command value gradually.Through after the transient process, the dc voltage stability of power winding rectification output is in command value, the power winding begins to DC bus powered, at this moment, by the control of control change device, the control winding provides the excitation reactive power by not only providing excitation reactive power but also active power of output only to be converted to generator to generator.
3) enter the high wind speed zone, by the control of control change device, the excitation reactive power of control change device regulator generator control winding makes power winding rectification output dc voltage be stable at command value, and the electric energy that generator sends is exported by the rectification of power winding.
Claims (3)
1. the asynchronous motor power generation system of stator duplex winding of generating in the wide wind speed range, it is characterized in that comprising major loop, low pressure small-power accessory power supply, detect loop and control loop, major loop is by dual stator-winding induction generator (1), filter inductance (2), control change device (3), rectifier bridge (4), exciting capacity (5), diode (7) and output inverter (15) constitute, low pressure small-power accessory power supply is made up of low capacity storage battery (6) and blocking diode, detect the loop by current sensor (8) and voltage sensor (9,10,11) form, control loop is made up of the drive circuit (13) of digital signal processor (12) and control change device; The anode of control winding side control change device (3) output dc voltage links to each other with the anode of power winding side rectifier bridge (4) output dc voltage by diode (7), and both negative terminals directly link to each other; The positive pole of low capacity storage battery (6) connects the anode of blocking diode, and the negative pole of low capacity storage battery (6) connects the negative terminal of control change device (3) output dc voltage, and the negative electrode of blocking diode connects the anode of control change device (3) output dc voltage.
2. control method based on the asynchronous motor power generation system of stator duplex winding that generates electricity in the described wide wind speed range of claim 1 is characterized in that comprising the generator operation control method in low wind speed district generator operation control method and high wind speed district:
Low wind speed district generator operation control method is: in low wind speed district, generator speed is lower, control winding terminal voltage is lower, the control winding reactive power of control change device (3) regulator generator, it is constant that the generator interior flux is kept, control the active power that generator sends simultaneously, rise principle by voltage pump, the electric energy that generator is sent exports on the dc bus through the control change device from control winding side, and the output dc voltage of control dc bus reaches command voltage, this voltage is higher than power winding rectifier bridge output voltage, thereby rectifier bridge (4) is blocked naturally;
High wind speed district generator operation control method is: in the high wind speed district, the rotating speed of generator is higher, and the output voltage of power winding is also higher, and the electric energy that generator sends is exported through rectifier bridge by the power winding; Along with the variation of rotating speed and load, control change device (3) comes the regulator generator interior flux by the control winding reactive power of regulator generator, makes the rectifier output voltage of power winding reach and is stable at command voltage, and diode (7) is instead ended partially.
3. the control method of the asynchronous motor power generation system of stator duplex winding of generating in the wide wind speed range according to claim 2, for the adjusting and the transition of output of a generator between two cover windings that realize high wind speed district power winding side rectifier output voltage are smoothly switched, a feature that is applied to the dual stator-winding induction generator of this method is: the number of turn of design control winding is lower than the number of turn of power winding, promptly controls winding terminal voltage and is lower than power winding terminal voltage.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101814889A (en) * | 2010-04-21 | 2010-08-25 | 台州市三民特种电机有限公司 | Constant voltage coreless disc type wind-driven generator |
| CN102624313B (en) * | 2012-03-23 | 2014-10-15 | 南京航空航天大学 | Excitation capacitance optimization method of wind power generation system of stator duplex-winding asynchronous motor |
| CN103326649B (en) * | 2013-05-29 | 2015-09-09 | 南京航空航天大学 | Stator double-winding asynchronous high voltage direct current starting-generating system and method thereof |
| EP2961060B1 (en) * | 2014-06-23 | 2021-06-09 | GE Energy Power Conversion Technology Ltd | Power supply system for a load and corresponding supply method |
| CN104242762A (en) * | 2014-10-14 | 2014-12-24 | 内蒙古科技大学 | Double-fed wind power generator frequency closed-loop control experiment device and control method |
| CN104377737B (en) * | 2014-11-13 | 2016-04-27 | 南京航空航天大学 | The microgrid topological structure of DWIG alternating current-direct current electricity generation system and control method |
| CN104377738B (en) * | 2014-11-13 | 2016-04-27 | 南京航空航天大学 | Microgrid DWIG alternating current-direct current electricity generation system and wide wind speed range energy in bidirectional flow method |
| CN104377700B (en) * | 2014-11-13 | 2016-04-27 | 南京航空航天大学 | To generate electricity by way of merging two or more grid systems in microgrid DWIG alternating current-direct current electricity generation system and wide wind speed range method |
| CN105529975B (en) * | 2016-02-06 | 2017-11-14 | 曲阜师范大学 | Single-phase self-excitation wind generator system |
| CN109004675B (en) * | 2018-08-27 | 2021-12-03 | 湖北工业大学 | Wide input auxiliary power supply of self-adaptation switching winding |
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