CN202455094U - Full-power converter, control system and direct-drive type wind power generating set - Google Patents

Full-power converter, control system and direct-drive type wind power generating set Download PDF

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Publication number
CN202455094U
CN202455094U CN2012200491103U CN201220049110U CN202455094U CN 202455094 U CN202455094 U CN 202455094U CN 2012200491103 U CN2012200491103 U CN 2012200491103U CN 201220049110 U CN201220049110 U CN 201220049110U CN 202455094 U CN202455094 U CN 202455094U
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China
Prior art keywords
convertor
current transformer
net side
pusher side
power unit
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Expired - Fee Related
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CN2012200491103U
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Chinese (zh)
Inventor
曾赣生
杨伟
任晓峰
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Sany Electric Co Ltd
Sany Electric Co Ltd Japan
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Sany Electric Co Ltd
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Abstract

The utility model relates to the technical field of wind power generation, in particular to a full-power converter, a control system and a direct-drive type wind power generating set. The full-power converter comprises a master converter and a slave converter, wherein the master converter is used for being connected between a first stator winding and a power grid; the slave converter is used for being connected between a second stator winding and the power grid; each of the master converter and the slave converter further comprises a machine-side reactor, and a machine-side PWM (Pulse Width Modulation) power unit, a direct-current bus, a network-side PWM power unit and a network-side filter which are connected in sequence. The full-power converter provided by the embodiment of the utility model has the advantages that since the master converter and the slave converter are connected in parallel, not only is the structure simple, but also the use need is met, simultaneously the quantity of electric elements is saved, and the volume of the full-power converter is reduced, so that the manufacturing cost is reduced.

Description

Full power convertor, control system and direct-drive aerogenerator group
Technical field
The utility model relates to technical field of wind power generation, particularly relates to a kind of full power convertor, control system and direct-drive aerogenerator group.
Background technology
Under the situation that energy supply day is becoming tight, environmental pollution is serious day by day, the cost of electricity-generating advantage that wind power generation relies on good benefits in environment and progressively reduces just progressively becomes the important channel that solves the world energy sources shortage.
At present, the main flow equipment on the MW class blower fan market is speed-variable frequency-constant wind-driven generator, can be divided into AC excitation double-fed wind-driven generator and permanent magnet direct-drive wind-force generating machine again according to the difference of structure.The permanent magnet direct-drive wind-force generating unit is owing to save gear box, and operation expense reduces greatly, and the reliability of system is improved.Connect through full power convertor between the stator winding of permanent magnet direct-drive wind-force generating machine and the electrical network, the electric energy that amplitude that full power convertor sends generator and frequency change at any time is converted into satisfactory electric energy and inserts electrical network.Full power convertor makes the permanent magnet direct-drive wind-force generating unit realize that easily low-voltage passes through, and through the maximal wind-energy tracer technique, can maximally utilise wind energy, and generating efficiency is further enhanced.
Along with reaching its maturity of blower fan market, megawatt-grade high-power permanent magnet direct-drive wind-force generating unit is more and more favored.Receive the restriction of power electronic device capacity, the full power convertor of high-power permanent magnet direct-drive aerogenerator generally adopts the technical scheme of power model parallel connection or the sub-current transformer parallel connection of a plurality of low capacities.But in existing parallelly connected scheme, its main circuit electric component is more, and the current transformer volume is bigger, and cost is higher, and perhaps the structural design of its control system is unreasonable, the control strategy more complicated, and system's operation is unreliable.
Therefore, how improving to above-mentioned deficiency, make full power convertor adapt to the development need of direct-drive aerogenerator more, is the technical barrier that those skilled in the art need to be resolved hurrily.
The utility model content
In view of this, the utility model is intended to propose a kind of full power convertor, control system and direct-drive aerogenerator group, with solve existing full power convertor structure too complicated, be unfavorable for problem such as control.
On the one hand; The utility model provides a kind of full power convertor; This full power convertor is used to be connected between generator and the electrical network; It comprises be used to be connected on first stator winding and the main convertor between the said electrical network of said generator and be used to be connected between second stator winding and the said electrical network of said generator from current transformer; Said main convertor and said pusher side reactor, pusher side pwm power unit (Pulse Width Modulation, pulse-width modulation), dc bus, net side pwm power unit and the net side filter that links to each other successively that all further comprise from current transformer.
Further, said pusher side reactor is the first three-phase filter inductance.
Further; Said pusher side pwm power unit comprises six first switching devices that contain first fly-wheel diode; Per two first switching devices join end to end and form one group of brachium pontis; Its tie point links to each other with said pusher side reactor, and three groups of brachium pontis are parallel with one another, and its dc output end links to each other with said dc bus.
Further; Said net side pwm power unit comprises six second switch devices that contain second fly-wheel diode; Per two second switch devices join end to end and form one group of brachium pontis; Its tie point links to each other with said net side filter, and three groups of brachium pontis are parallel with one another, and its direct-flow input end links to each other with said dc bus.
Further; Said net side filter comprises that the second three-phase filter inductance and dihedral connect the three-phase filter capacitor of method; One end of the said second three-phase filter inductance links to each other with the output of said net side pwm power unit, and the other end is parallelly connected with the three-phase filter capacitor that dihedral connects method.
Further, be connected with direct current between the said dc bus and support electric capacity.
Further, said main convertor and/or saidly also comprise the pusher side contactor between the stator winding that is used to be connected on said pusher side reactor and said engine from current transformer and be used to be connected on the net side main contactor between said net side filter and the said electrical network.
On the other hand, the utility model also provides a kind of control system, and this control system is applied to above-mentioned each described full power convertor, and it comprises host computer, also comprises:
Main convertor pusher side DSP (Digital Signal Processor, data signal processor) is used for being responsible for the control and the pusher side information collecting of said main convertor pusher side pwm power unit;
Main convertor net side DSP; Be used for being responsible for the control and the net side information collecting of said main convertor net side pwm power unit;
From current transformer pusher side DSP, be used for being responsible for said control and pusher side information collecting from current transformer pusher side pwm power unit;
From current transformer net side DSP, be used for being responsible for said control and net side information collecting from current transformer net side pwm power unit;
Main convertor PLC and/or from current transformer PLC (Programmable Logic Controller; Programmable logic controller (PLC)); Be used to realize following operation: the commands for controlling corresponding D SP that controls that sends according to said host computer makes action, with feedback information to the said host computer of above-mentioned each DSP collection.
Further, said main convertor PLC and/or saidly be provided with the PC debugging interface from current transformer PLC is used for linking to each other with the PC debugger.
On the one hand, the utility model also provides a kind of direct-drive aerogenerator group again, and this direct-drive aerogenerator group is provided with above-mentioned each described full power convertor.
Full power convertor that the utility model provides and the direct-drive aerogenerator group that is provided with this full power convertor; Adopt main convertor and link to each other with electrical network from the corresponding stator winding of current transformer with generator; Main convertor with include the pusher side reactor that links to each other successively, pusher side pwm power unit, dc bus, net side pwm power unit and net side filter from current transformer; Simple in structure, cost is lower; Further; Adopt the three-phase filter inductance as the pusher side reactor, adopt six switching devices to form three groups of parallel connection brachium pontis and perhaps net side pwm power unit, adopt three-phase filter inductance and dihedral to connect the parallelly connected conduct net of the three-phase filter capacitor side filter of method as pusher side pwm power unit; In satisfied use needs; Both save electric component quantity, also reduced the volume of full power convertor, further reduced manufacturing cost.
A kind of control system that is applied to above-mentioned full power convertor that the utility model provides; Form by host computer, main convertor PLC and/or from current transformer PLC, a plurality of DSP; Wherein, DSP realizes pusher side pwm power unit or nets the control operation of side pwm power unit and realize that current transformer PLC is the intermediate management unit between host computer and two current transformers, is used for making action according to the commands for controlling corresponding D SP that controls that said host computer sends to pusher side or net side information collecting; Perhaps be used for feedback information to said host computer with above-mentioned each DSP collection; The whole control system is control structure reasonable (can increase redundancy as required) not only, and control strategy is simple, thereby has guaranteed the reliability service of whole system.
Description of drawings
The principle schematic of a kind of full power convertor that Fig. 1 provides for the utility model embodiment;
A kind of structured flowchart that is applied to the control system of full power convertor shown in Figure 1 that Fig. 2 provides for the utility model embodiment.
Embodiment
In order to make those skilled in the art understand the technical scheme of the utility model better, the utility model is done further to specify below in conjunction with accompanying drawing and specific embodiment.Should be pointed out that description and the description order to concrete structure only is the explanation to specific embodiment in this part, should not be regarded as that the protection range of the utility model is had any restriction.
Please refer to Fig. 1; The principle schematic of a kind of full power convertor that Fig. 1 provides for the utility model embodiment, as shown in the figure, in use; One end of this full power convertor links to each other with the stator winding of engine G, and the other end links to each other with electrical network through the 690V/35KV step-up transformer.
Particularly, engine G is the permanent magnet direct-drive generator, and its stator winding adopts not have and differs double-winding structure, comprises first stator winding and second stator winding; Full power convertor comprises main convertor and from current transformer; Main convertor is connected between first stator winding and the electrical network; Be connected between second stator winding and the electrical network from current transformer; Main convertor is identical with structure from current transformer, includes the pusher side contactor KMg, pusher side reactor, pusher side pwm power unit, dc bus, net side pwm power unit, net side filter, net side main contactor KM1 and the net side K switch 1 that link to each other successively.
Wherein, The input of pusher side contactor KMg links to each other with stator winding; The pusher side reactor is specially the first three-phase filter inductance Lg; The output of pusher side contactor KMg links to each other with the end of the first three-phase filter inductance Lg, and the other end of the first three-phase filter inductance Lg is connected to the Ag of pusher side pwm power unit, Bg and three tie points of Cg.
Pusher side pwm power unit comprises six first switching devices (Tg1, Tg2, Tg3, Tg4, Tg5 and Tg6) that contain first fly-wheel diode (Dg1, Dg2, Dg3, Dg4, Dg5 and Dg6); Per two first switching devices are one group; Be respectively Tg1 and Tg4, Tg3 and Tg6, Tg5 and Tg2; Two second switch devices in every group join end to end and form three groups of brachium pontis then, and its tie point is respectively Ag, Bg and Cg, and three groups of brachium pontis parallel connections form the main circuits of pusher side pwm power unit.
The dc output end of pusher side pwm power unit links to each other with dc bus, is connected with direct current between the dc bus and supports capacitor C.The direct-flow input end of net side pwm power unit links to each other with dc bus; The main circuit generation type of net side pwm power unit and the similar of pusher side pwm power unit main circuit; It comprises six second switch devices (T11, T12, T13, T14, T15 and T16) that contain second fly-wheel diode (D11, D12, D13, D14, D15 and D16); Per two second switch devices are one group; Be respectively T11 and T14, T13 and T16, T15 and T12, two second switch devices in every group join end to end and form three groups of brachium pontis then, and its tie point is respectively A1, B1 and C1.
The net side filter is the LC filter; It comprises that the second three-phase filter inductance L1 and dihedral meet the three-phase filter capacitor Cf of method; The end of the second three-phase filter inductance L1 is connected to A1, B1 and C1; The other end and dihedral connect the end that the three-phase filter capacitor Cf of method is connected to net side main contactor KM1 after parallelly connected, and the other end of net side main contactor KM1 links to each other with net side K switch 1.
One of main convertor terminates on first stator winding of generator G, terminates on second stator winding of electric organ G main convertor and the low-pressure side that after the net side is parallelly connected, is connected to the 690V/35kV step-up transformer from the other end of current transformer from one of current transformer.
In the course of the work; The time dependent alternating current of amplitude that generator G sends and frequency is through pusher side contactor reader reactor; The pusher side reactor can play the effect of mild current waveform, avoids electric current generation big ups and downs, the AC rectification that pusher side pwm power unit can send generator G; And be passed on the dc bus; Direct current on the dc bus supports capacitor C can keep the constant of bus direct voltage, makes it remain on certain stationary value scope basically, and net side pwm power unit can become industrial-frequency alternating current with the dc inversion on the dc bus; The net side filter is the LC filter; Can be with the harmonic filtration in the net side pwm power element output signal, industrial-frequency alternating current is delivered to the low-pressure side of 690V/35kV step-up transformer, this AC energy is delivered to through the 35kV ultra-high-tension power transmission line through boost operations by this step-up transformer and uses the zone.When electrical network breaks down, can cut off and the getting in touch of electrical network through net side switch, when the miscellaneous part of generator G or wind turbine generator breaks down, can cut off and the getting in touch of electrical network through net side main contactor, so that keep in repair protection.
Need to prove that in the foregoing description, main convertor and separate from current transformer can move simultaneously, also can only move one of them as required.
Need to prove; In the foregoing description, only adopt the first three-phase filter inductance Lg as the pusher side reactor, in satisfied use needs; Reduced the quantity of electric component; Also reduce manufacturing cost, but in other embodiments, also can use other forms of pusher side reactor as required.
Need to prove that in the foregoing description, first switching device and second switch device are IGBT (Insulated Gate Bipolar Transistor; Insulated gate bipolar transistor); But in other embodiments, also can use other switching devices that meet functional requirement as required, for example; IGCT (Intergrated Gate Commutated Thyristors, integrated gate commutated thyristor); In addition, in the foregoing description, the number of first switching device and second switch device is six, but in other embodiments, also can adopt first switching device and the second switch device of other numbers as required.
The full power convertor that the utility model embodiment provides forms through main convertor with from current transformer parallel connection, and main convertor is identical with concrete structure from current transformer; All adopt the three-phase filter inductance as the pusher side reactor; Adopt six switching devices to form three groups of parallel connection brachium pontis, and the parallelly connected conduct of three-phase filter capacitor of adopting three-phase filter inductance and dihedral to connect method net side filter as pusher side pwm power unit and net side pwm power unit, not only simple in structure; And in satisfied use needs; Both save electric component quantity, also reduced the volume of full power convertor, further reduced manufacturing cost.
Please refer to Fig. 2, a kind of structured flowchart that is applied to the control system of full power convertor shown in Figure 1 that Fig. 2 provides for the utility model embodiment.
As shown in the figure, this control system mainly comprises host computer 10, primary scene bus 11, PC debugger 12, main convertor PLC13, from current transformer PLC14, secondary scene bus 15, main convertor pusher side DSP16, main convertor net side DSP17, from current transformer pusher side DSP18 with from current transformer net side DSP19.
Wherein, main convertor pusher side DSP16 is used for being responsible for the control and the pusher side information collecting of said main convertor pusher side pwm power unit; Main convertor net side DSP17; Be used for being responsible for the control and the net side information collecting of said main convertor net side pwm power unit; From current transformer pusher side DSP18, be used for being responsible for said control and pusher side information collecting from current transformer pusher side pwm power unit; From current transformer net side DSP19, be used for being responsible for said control and net side information collecting from current transformer net side pwm power unit; Main convertor pusher side DSP16, main convertor net side DSP17, all be connected to secondary scene bus 15 from current transformer pusher side DSP18 with from current transformer net side DSP19; The port of main convertor PLC13 is connected to secondary scene bus 15; Another port is connected to primary scene bus 11; Also be provided with the PC debugging interface on the main convertor PLC13, PC debugger 12 can be connected to this PC debugging interface, and PC debugger 12 has following effect at least: 1, trace debug is to adapt to running environment; 2, be used for common debug, with the position of orientation problem; Be connected to secondary scene bus 15 from the port of current transformer PLC14, another port is connected to primary scene bus 11; Each DSP, each PLC are installed in respectively in the corresponding current transformer; A port of host computer 10 is connected to primary scene bus 11.
Main convertor PLC13 is the master controller of full power convertor, is the intermediate management unit between host computer 10 and principal and subordinate's two current transformers, and the operation of principal and subordinate two each DSP of current transformer is coordinated in its control, and the PC debugging interface is provided; When main convertor PLC13 moves, be in stand-by state from current transformer PLC14, when main convertor PLC13 was out of service, it can be used as the master controller of full power convertor, and the operation of principal and subordinate two each DSP of current transformer is coordinated in control; In the course of the work, main convertor PLC13 perhaps can make action according to the commands for controlling corresponding D SP that controls that host computer 10 sends from current transformer PLC14, perhaps can be with feedback information to the host computer 10 of above-mentioned each DSP collection.
Need to prove that in the foregoing description, the information that above-mentioned each DSP collects comprises voltage, frequency, power and energy output etc.
Need to prove that in the foregoing description, primary scene bus 11 can adopt the CAN bus with secondary scene bus 15; Also can adopt the other types bus; As long as can satisfy the use needs, for example, primary scene bus 11 can also be used the profibus bus.
A kind of control system that is applied to above-mentioned full power convertor that the utility model embodiment provides; Form by host computer, main convertor PLC with from current transformer PLC, a plurality of DSP; Wherein, DSP realizes pusher side pwm power unit or nets the control operation of side pwm power unit and realize that current transformer PLC is the intermediate management unit between host computer and two current transformers, is used for making action according to the commands for controlling corresponding D SP that controls that said host computer sends to pusher side or net side information collecting; And be used for feedback information to said host computer that above-mentioned each DSP is collected; The whole control system is control structure reasonable (having increased the redundancy of control structure from current transformer PLC) not only, and control strategy is simple, thereby has guaranteed the reliability service of whole system.
The utility model embodiment also provides a kind of direct-drive aerogenerator group; This direct-drive aerogenerator group is provided with above-mentioned full power convertor and control corresponding system; Because above-mentioned full power convertor and control system has above-mentioned technique effect, therefore, this direct-drive aerogenerator group also should possess the corresponding techniques effect; Its practical implementation process is similar to the above embodiments, does not give unnecessary details now.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.

Claims (10)

1. full power convertor; Be used to be connected between generator and the electrical network; It is characterized in that; This full power convertor comprise be used to be connected on first stator winding and the main convertor between the said electrical network of said generator and be used to be connected between second stator winding and the said electrical network of said generator from current transformer, said main convertor and said pusher side reactor, pusher side pwm power unit, dc bus, net side pwm power unit and the net side filter that links to each other successively that all further comprise from current transformer.
2. full power convertor as claimed in claim 1 is characterized in that, said pusher side reactor is the first three-phase filter inductance.
3. full power convertor as claimed in claim 1; It is characterized in that; Said pusher side pwm power unit comprises six first switching devices that contain first fly-wheel diode, and per two first switching devices join end to end and form one group of brachium pontis, and its tie point links to each other with said pusher side reactor; Three groups of brachium pontis are parallel with one another, and its dc output end links to each other with said dc bus.
4. full power convertor as claimed in claim 1; It is characterized in that; Said net side pwm power unit comprises six second switch devices that contain second fly-wheel diode, and per two second switch devices join end to end and form one group of brachium pontis, and its tie point links to each other with said net side filter; Three groups of brachium pontis are parallel with one another, and its direct-flow input end links to each other with said dc bus.
5. full power convertor as claimed in claim 1; It is characterized in that; Said net side filter comprises that the second three-phase filter inductance and dihedral connect the three-phase filter capacitor of method; One end of the said second three-phase filter inductance links to each other with the output of said net side pwm power unit, and the other end is parallelly connected with the three-phase filter capacitor that dihedral connects method.
6. like each described full power convertor of claim 1 to 5, it is characterized in that, be connected with direct current between the said dc bus and support electric capacity.
7. like each described full power convertor of claim 1 to 5; It is characterized in that said main convertor and/or saidly also comprise the pusher side contactor between the stator winding that is used to be connected on said pusher side reactor and said engine from current transformer and be used to be connected on the net side main contactor between said net side filter and the said electrical network.
8. a control system is applied to each described full power convertor of claim 1 to 7, comprises host computer, it is characterized in that said control system also comprises:
Main convertor pusher side DSP is used for being responsible for the control and the pusher side information collecting of said main convertor pusher side pwm power unit;
Main convertor net side DSP; Be used for being responsible for the control and the net side information collecting of said main convertor net side pwm power unit;
From current transformer pusher side DSP, be used for being responsible for said control and pusher side information collecting from current transformer pusher side pwm power unit;
From current transformer net side DSP, be used for being responsible for said control and net side information collecting from current transformer net side pwm power unit;
Main convertor PLC and/or from current transformer PLC, be used to realize following operation: the commands for controlling corresponding D SP that controls that sends according to said host computer makes action, feedback information to the said host computer that above-mentioned each DSP is collected.
9. control system as claimed in claim 8 is characterized in that, said main convertor PLC and/or saidly be provided with the PC debugging interface from current transformer PLC is used for linking to each other with the PC debugger.
10. a direct-drive aerogenerator group is characterized in that, said direct-drive aerogenerator group is provided with each described full power convertor of claim 1 to 7.
CN2012200491103U 2012-02-15 2012-02-15 Full-power converter, control system and direct-drive type wind power generating set Expired - Fee Related CN202455094U (en)

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Application Number Priority Date Filing Date Title
CN2012200491103U CN202455094U (en) 2012-02-15 2012-02-15 Full-power converter, control system and direct-drive type wind power generating set

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Application Number Priority Date Filing Date Title
CN2012200491103U CN202455094U (en) 2012-02-15 2012-02-15 Full-power converter, control system and direct-drive type wind power generating set

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106787803A (en) * 2016-12-29 2017-05-31 北京金风科创风电设备有限公司 Full-power converter for wind generating set
EP3734832A4 (en) * 2017-12-28 2021-01-06 Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. Method, device, and system for controlling operation of generator
CN113126517A (en) * 2020-01-16 2021-07-16 江苏和网源电气有限公司 Low-voltage ride through test platform for direct-drive fan

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106787803A (en) * 2016-12-29 2017-05-31 北京金风科创风电设备有限公司 Full-power converter for wind generating set
EP3734832A4 (en) * 2017-12-28 2021-01-06 Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. Method, device, and system for controlling operation of generator
US11152789B2 (en) 2017-12-28 2021-10-19 Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. Method, device, and system for controlling operation of generator
CN113126517A (en) * 2020-01-16 2021-07-16 江苏和网源电气有限公司 Low-voltage ride through test platform for direct-drive fan

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