CN202474885U - Variable-speed wind power system based on variable-frequency transformer - Google Patents
Variable-speed wind power system based on variable-frequency transformer Download PDFInfo
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- CN202474885U CN202474885U CN2012201139272U CN201220113927U CN202474885U CN 202474885 U CN202474885 U CN 202474885U CN 2012201139272 U CN2012201139272 U CN 2012201139272U CN 201220113927 U CN201220113927 U CN 201220113927U CN 202474885 U CN202474885 U CN 202474885U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a variable-speed wind power system based on a variable-frequency transformer. The variable-speed wind power system comprises a cage-type wind turbine group, a variable-frequency alternating-current bus, a step-up transformer, a high-voltage power transmission line, a step-down transformer, the variable-frequency transformer, and a power-frequency electric grid, wherein the variable-frequency alternating currents sent by the cage-type wind turbine group are collected on the variable-frequency alternating-current bus, the variable-frequency alternating currents on the variable-frequency alternating-current bus are stepped up by the step-up transformer and then transmitted to the step-down transformer via the high-voltage power transmission line, the variable-frequency alternating currents stepped down by the step-down transformer enter the variable-frequency transformer, and the variable-frequency transformer converts the variable-frequency alternating currents to power-frequency alternating currents, and injects the power-frequency alternating currents in the power-frequency electric grid. The variable-speed wind power system based on the variable-frequency transformer disclosed by the utility model can increase the single-machine capacity of the wind turbine group, decrease the failure rate of the group, reduce maintenance work, increase effective power generation time, increase the utilization rate of wind energy, and reduce mechanical stress and output power fluctuation; and the variable-speed wind power system based on the variable-frequency transformer disclosed by the utility model is simple in control and convenient in operation.
Description
Technical field
The utility model belongs to wind power generation field, relates to coastal waters wind energy turbine set exploitation, existing constant speed wind energy turbine set transformation, particularly a kind of speed change wind power system based on the variable frequency transformer.
Background technology
Wind power generation is one of renewable energy power generation mode that melts clockwork spring spare and commercialized development prospect with fastest developing speed at present, on the largest scale.The coastal waters wind-powered electricity generation has advantages such as wind speed height, turbulence intensity is little, wind speed and direction is stable, is the inexorable trend of wind-powered electricity generation industry development from now on.China's coastal waters wind energy resources is abundant, and near Tohoku Electric Power's load center, helps electrical network and dissolve, and avoids long distance power transmission, and therefore developing coastal waters wind-powered electricity generation resource energetically has significant social and economic benefit.
Coastal waters wind-powered electricity generation unit foundation construction expense is high, maintenance difficulties is big; And the restriction of weather and marine environment is difficult to obtain on-call maintenance after making the unit fault, therefore improves wind-powered electricity generation unit single-machine capacity, reduces maintenance work and increase effective generating dutation extremely important for the exploitation of coastal waters wind-powered electricity generation resource.In " the wind-powered electricity generation security control report (2011 No. 4) " of State Electricity Regulatory Commission's issue, the 2010 annual wind-powered electricity generation unit failure modes statisticss that 12 tame wind-powered electricity generation operation enterprises provide have been announced, in adding up to about 3.5 ten thousand times wind-powered electricity generation unit fault; Pitch-variable system accounts for 19.3%, and frequency conversion system accounts for 14.5%, and electrical system accounts for 10.4%; Transducer accounts for 9.4%, and hydraulic system accounts for 7.7%, and electric control system accounts for 6.8%; Generator accounts for 6.7%; Yaw system accounts for 6.4%, and gear box accounts for 5.5%, and the remaining part total accounts for 13.3%.Above-mentioned statistics has important value for the raising of wind-powered electricity generation unit reliability.
Permanent magnet direct-drive and double-fed fan motor unit are the mainstream models of current variable-speed constant-frequency wind power generation.The permanent magnetism direct drive wind group of motors has been eliminated gear box, yet the size of multipole slowspeed machine and weight are unfavorable for the raising of single-machine capacity, in case and the permanent magnet loss of excitation, change and safeguard very difficulty.The advantage of double-fed fan motor unit is that electronic power convertor only need transmit slip power, and the capacity of current transformer and cost are significantly reduced, yet its slip ring and brush need regular maintenance, and this is no small burden as far as the coastal waters wind-powered electricity generation.
Cage modle wind-powered electricity generation unit brushless and slip ring, simple and reliable for structure help improving single-machine capacity, reduce marine maintenance work and increase effective generating dutation if be applied to the coastal waters wind-powered electricity generation.Existing cage modle wind-powered electricity generation unit is realized variable speed constant frequency generator through the total power indirect AC convertor, however the costing an arm and a leg of large-capacity power electronic inverter, and for every typhoon group of motors to be equipped with the mode of current transformer separately also more uneconomical.In addition, according to aforementioned fault statistics data, the ratio of frequency conversion system, electrical system and sensor fault is arranged the 2nd to 4 the integrity problem of statement of facts current transformer and Measurement and Control System thereof in all kinds of faults also very important.
In recent years, GE has developed 100 MW variable frequency transformers, and has successfully realized the asynchronous interconnected of Quebec, CAN electrical network and USA New York electrical network with it.Variable frequency transformer adopting speed change mode of frequency regulation replaces electronic power conversion frequency modulation, greatly reduces the capacity and the cost of power electronic equipment, and has stronger overload capacity, and this technology is that the variable speed generation of a cage modle wind-powered electricity generation group of planes provides new thinking.
Along with the increase of wind-powered electricity generation installed capacity, from keeping the angle of the stabilization of power grids, require the wind-powered electricity generation unit when electric network electric voltage drop, can keep not off-grid operation, promptly possess low voltage ride-through capability.There is following problem respectively in the low-voltage scheme of passing through of existing cage modle wind-powered electricity generation unit: 1. STATCOM or SVC output reactive power is recovered the scheme of wind energy turbine set terminal voltage; Since the reactive power fan-out capability of STATCOM, SVC respectively with voltage, the proportional relation of voltage squared; Idle fan-out capability reduces greatly during electric voltage dropping; Therefore need jumbo reactive power compensator, cause cost too high; 2. adopt series connection dynamic electric voltage adjuster during electric network fault, wind-powered electricity generation unit terminal voltage to be maintained the scheme of rated value; Because series connection dynamic electric voltage adjuster must absorb and consume most of active power that the wind-powered electricity generation unit sends, and needs jumbo power electronic equipment equally; 3. adopt tandem brake resistance to promote the wind energy turbine set terminal voltage and absorb the scheme of superfluous active power,, when load power factor is low, can't solve the transient state destabilization problems because that tandem brake resistance does not produce is idle.
Summary of the invention
The purpose of the utility model is to consider the problems referred to above and provides a kind of and can not only increase wind-powered electricity generation unit single-machine capacity, reduces the unit failure rate, reduces maintenance work and increase effective generating dutation, and can improve wind energy utilization, reduces the speed change wind power system based on the variable frequency transformer of mechanical stress and output-power fluctuation.The utility model control is simple, easy to operate.
The technical scheme of the utility model is: the speed change wind power system based on the variable frequency transformer of the utility model; Include a cage modle wind-powered electricity generation group of planes, frequency-changing AC bus, step-up transformer, high voltage transmission line, step-down transformer, variable frequency transformer, common frequency power network; Wherein the frequency-changing AC electricity that sent of a cage modle wind-powered electricity generation group of planes collects on the frequency-changing AC bus; Frequency-changing AC electricity on the frequency-changing AC bus transfers to step-down transformer through high voltage transmission line after step-up transformer boosts; Get into the variable frequency transformer by the electricity of the frequency-changing AC after the step-down transformer step-down; The variable frequency transformer converts the frequency-changing AC electricity into industrial-frequency alternating current through the speed change fm role, and the variable frequency transformer injects common frequency power network with industrial-frequency alternating current.
Above-mentioned variable frequency transformer includes double feedback electric engine and the direct current machine and the DC motor driver of coaxial mechanical connection; Wherein the rotating shaft of double feedback electric engine is connected with the rotating shaft of direct current machine; Direct current machine is electrically connected with DC motor driver; Frequency-changing AC electricity after the above-mentioned step-down transformer step-down gets into the rotor winding of double feedback electric engine, and double feedback electric engine converts the frequency-changing AC electricity into industrial-frequency alternating current through the speed change fm role, and the stator winding of double feedback electric engine injects common frequency power network with industrial-frequency alternating current.
Above-mentioned frequency-changing AC bus also is connected with dynamic reactive compensation device.
Above-mentioned DC motor driver also is connected with uninterrupted power supply.
The utility model compared with prior art has following advantage:
1) the utility model adopts brushless and slip ring, cage modle wind-powered electricity generation unit simple and reliable for structure, helps improving wind-powered electricity generation unit single-machine capacity, reduces maintenance work and increases effective generating dutation;
2) the utility model adopts the variable frequency transformer to realize the speed changing, frequency converting generating of a cage modle wind-powered electricity generation group of planes; Help improving wind energy utilization, reduce mechanical stress and output-power fluctuation; Reduce simultaneously the capacity and the cost of power electronic equipment greatly, improve anti-overcurrent and superpotential ability;
3) the utility model is to the basic reason of cage modle wind-powered electricity generation unit rotating speed and terminal voltage unstability when electric network electric voltage drop; Prevent that with the mode that cage modle wind-powered electricity generation group of planes rotating speed rises slip is out-of-limit through control of conversion ac bus frequency; Thereby the realization low-voltage is passed through; Greatly reduce the capacity and the cost of dynamic reactive compensation device, have very high cost performance;
4) the utility model is because the inherent characteristic of variable frequency transformer; The amplitude of frequency-changing AC busbar voltage will rise with frequency; Help the reactive power fan-out capability of dynamic reactive compensation device and fixed capacitor group in the raising system, realize support better line voltage.
The utility model is a kind ofly can not only increase wind-powered electricity generation unit single-machine capacity, reduce the unit failure rate, reduce maintenance work and increase effective generating dutation, and can improve wind energy utilization, reduces the speed change wind power system based on the variable frequency transformer of mechanical stress and output-power fluctuation.The utility model control is simple, easy to operate.
Description of drawings
Fig. 1 is the schematic diagram of the utility model.
Embodiment
Embodiment:
The schematic diagram of the utility model is as shown in Figure 1; The speed change wind power system based on the variable frequency transformer of the utility model; Include a cage modle wind-powered electricity generation group of planes 1, frequency-changing AC bus 2, step-up transformer 4, high voltage transmission line 5, step-down transformer 6, variable frequency transformer 10, common frequency power network 12; Wherein the frequency-changing AC electricity that sent of a cage modle wind-powered electricity generation group of planes 1 collects on the frequency-changing AC bus 2; Frequency-changing AC electricity on the frequency-changing AC bus 2 transfers to step-down transformer 6 through high voltage transmission line 5 after step-up transformer 4 boosts; Get into variable frequency transformer 10 by the electricity of the frequency-changing AC after step-down transformer 6 step-downs, variable frequency transformer 10 converts the frequency-changing AC electricity into industrial-frequency alternating current through the speed change fm role, and variable frequency transformer 10 injects common frequency power network 12 with industrial-frequency alternating current.
In the present embodiment; Above-mentioned variable frequency transformer 10 includes the double feedback electric engine 7 and direct current machine 8 and DC motor driver 9 of coaxial mechanical connection; Wherein the rotating shaft of double feedback electric engine 7 is connected with the rotating shaft of direct current machine 8; Direct current machine 8 is electrically connected with DC motor driver 9; Frequency-changing AC electricity after above-mentioned step-down transformer 6 step-downs gets into the rotor winding of double feedback electric engine 7, and double feedback electric engine 7 converts the frequency-changing AC electricity into industrial-frequency alternating current through the speed change fm role, and the stator winding of double feedback electric engine 7 injects common frequency power network 12 with industrial-frequency alternating current.
In addition, above-mentioned frequency-changing AC bus 2 also is connected with dynamic reactive compensation device 3.
In addition, above-mentioned DC motor driver 9 also is connected with uninterrupted power supply 11.
The utility model is based on the control method of the speed change wind power system of variable frequency transformer; The control method of an above-mentioned cage modle wind-powered electricity generation group of planes 1 rotating speed is through the rotating speed of the driving moment control double feedback electric engine 7 of direct current machine 8; Thereby the frequency of control of conversion ac bus 2; The rotating speed of a cage modle wind-powered electricity generation group of planes 1 is changed with wind speed, realize the maximum power output of wind energy turbine set.
In the present embodiment, the concrete steps of the method for controlling number of revolution of an above-mentioned cage modle wind-powered electricity generation group of planes 1 are following:
1) according to the wind speed of each wind energy conversion system position of recording, the optimal frequency of frequency-changing AC bus 2 when COMPREHENSIVE CALCULATING realizes the output of wind energy turbine set maximum power, thus calculate the speed reference of variable frequency transformer 10;
2) according to the speed reference of variable frequency transformer 10 and the command value of deviation of measuring value generation direct current machine driving moment; Realization is to the closed-loop control of variable frequency transformer 10 rotating speeds; Thereby the rotating speed of controlling a cage modle wind-powered electricity generation group of planes 1 is indirectly followed the average optimal wind speed and is changed, and realizes the maximum power output of wind energy turbine set.
In the present embodiment, the voltage magnitude of the Reactive Power Control frequency-changing AC bus 2 of the control method of the voltage magnitude of above-mentioned frequency-changing AC bus 2 through dynamic reactive compensation device 3 makes the ratio of itself and bus frequency keep constant.
In the present embodiment, the concrete steps of the control method of the voltage magnitude of above-mentioned frequency-changing AC bus 2 are following:
1) adopt PHASE-LOCKED LOOP PLL TECHNIQUE to measure the frequency of frequency-changing AC bus 2 in real time, according to the reference value of the voltage magnitude of the proportionate relationship calculating frequency-changing AC bus 2 of the rotor winding frequency of variable frequency transformer 10 and voltage;
2) command value that produces the reactive power of dynamic reactive compensation device 3 according to the reference value and the deviation of measuring value of the voltage magnitude of frequency-changing AC bus 2 realizes the closed-loop control to the voltage magnitude of frequency-changing AC bus 2.
Above-mentioned low voltage traversing control method is the normal operation of being kept DC motor driver 9 during the electric network electric voltage drop by uninterrupted power supply 11; Rotating speed through control variable frequency transformer 10 makes the rotation speed change of the frequency of frequency-changing AC bus 2 with a cage modle wind-powered electricity generation group of planes 1; Make the revolutional slip of a cage modle wind-powered electricity generation group of planes 1 maintain rated value; Make it after electric network fault is removed, can recover electromagnetic torque rapidly and reduce reactive power consumption; Thereby avoid the rotating speed and the terminal voltage unstability of a cage modle wind-powered electricity generation group of planes 1, the realization low-voltage is passed through.
In the present embodiment, the concrete steps of above-mentioned low voltage traversing control method are following:
1) behind the electric voltage dropping that detects common frequency power network 12; Revise the target of the speed closed loop control of variable frequency transformer 10; The mean speed of a cage modle wind-powered electricity generation group of planes 1 that records is deducted the expected frequency of specified slip as frequency-changing AC bus 2; And calculate the speed reference of corresponding variable frequency transformer 10, thereby the frequency of control of conversion ac bus 2 with the wind the rotating speed of motor group 1 rise, revolutional slip is maintained near the rated value;
2) parameter according to power electronic device in the dynamic reactive compensation device 3 is provided with the output current upper limit to prevent overcurrent; The controlled target of dynamic reactive compensation device 3 can be set to control the voltage magnitude tracing preset reference value of control of conversion ac bus 2, or recovers to accelerate line voltage according to electrical network demand output reactive power.
The operation principle of the utility model is following: the frequency-changing AC electricity that a cage modle wind-powered electricity generation group of planes 1 is sent collects on the frequency-changing AC bus 2; Frequency-changing AC electricity on the frequency-changing AC bus 2 transfers to step-down transformer 6 through high voltage transmission line 5 after step-up transformer 4 boosts; Get into the rotor winding of the double feedback electric engine 7 in the variable frequency transformer 10 by the electricity of the frequency-changing AC after step-down transformer 6 step-downs; Double feedback electric engine 7 converts the frequency-changing AC electricity into industrial-frequency alternating current through the speed change fm role, and the stator winding of double feedback electric engine 7 injects common frequency power network 12 with industrial-frequency alternating current.
In addition; The utility model is regulated frequency-changing AC bus frequency through DC MOTOR CONTROL double feedback electric engine rotating speed, makes cage modle wind-powered electricity generation group of planes rotating speed follow wind speed and changes; Realize the maximum power output of wind energy turbine set, through dynamic reactive compensation device control of conversion ac bus voltage magnitude; In addition, during the electric network electric voltage drop, control of conversion ac bus frequency rises in case the spline rate is out-of-limit with cage modle wind-powered electricity generation group of planes rotating speed, thereby the realization low-voltage is passed through.The utility model adopts cage modle wind-powered electricity generation unit simple and reliable for structure, helps improving single-machine capacity, reduces maintenance work and increases effective generating dutation; The utility model cage modle wind-powered electricity generation group of planes runs on the speed changing, frequency converting mode, helps improving wind energy utilization, reduces mechanical stress and output-power fluctuation; The method that the utility model passes through through raising frequency-changing AC bus frequency realization low-voltage can reduce the capacity of dynamic reactive compensation device greatly, has very high cost performance.The utility model is that the upgrading of the large-scale development of coastal waters wind-powered electricity generation resource, existing constant speed wind energy turbine set provides a kind of economy, reliable scheme.
Claims (4)
1. speed change wind power system based on the variable frequency transformer; It is characterized in that including a cage modle wind-powered electricity generation group of planes (1), frequency-changing AC bus (2), step-up transformer (4), high voltage transmission line (5), step-down transformer (6), variable frequency transformer (10), common frequency power network (12); Wherein the frequency-changing AC electricity that sent of a cage modle wind-powered electricity generation group of planes (1) collects on the frequency-changing AC bus (2); Frequency-changing AC electricity on the frequency-changing AC bus (2) transfers to step-down transformer (6) through high voltage transmission line (5) after step-up transformer (4) boosts; Get into variable frequency transformer (10) by the electricity of the frequency-changing AC after step-down transformer (6) step-down; Variable frequency transformer (10) converts the frequency-changing AC electricity into industrial-frequency alternating current through the speed change fm role, and variable frequency transformer (10) injects common frequency power network (12) with industrial-frequency alternating current.
2. the speed change wind power system based on the variable frequency transformer according to claim 1; It is characterized in that above-mentioned variable frequency transformer (10) includes double feedback electric engine (7) and the direct current machine (8) and the DC motor driver (9) of coaxial mechanical connection; Wherein the rotating shaft of double feedback electric engine (7) is connected with the rotating shaft of direct current machine (8); Direct current machine (8) is electrically connected with DC motor driver (9); Frequency-changing AC electricity after above-mentioned step-down transformer (6) step-down gets into the rotor winding of double feedback electric engine (7); Double feedback electric engine (7) converts the frequency-changing AC electricity into industrial-frequency alternating current through the speed change fm role, and the stator winding of double feedback electric engine (7) injects common frequency power network (12) with industrial-frequency alternating current.
3. the speed change wind power system based on the variable frequency transformer according to claim 2 is characterized in that above-mentioned frequency-changing AC bus (2) also is connected with dynamic reactive compensation device (3).
4. according to claim 2 or 3 described speed change wind power systems, it is characterized in that above-mentioned DC motor driver (9) also is connected with uninterrupted power supply (11) based on the variable frequency transformer.
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| CN2012201139272U CN202474885U (en) | 2012-03-23 | 2012-03-23 | Variable-speed wind power system based on variable-frequency transformer |
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| CN2012201139272U CN202474885U (en) | 2012-03-23 | 2012-03-23 | Variable-speed wind power system based on variable-frequency transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624026A (en) * | 2012-03-23 | 2012-08-01 | 广东工业大学 | Variable speed wind-power system based on variable frequency transformer and control method of variable speed wind-power system |
| CN113358975A (en) * | 2021-06-11 | 2021-09-07 | 南方电网数字电网研究院有限公司 | Fault detection method and device for power transmission network, computer equipment and storage medium |
-
2012
- 2012-03-23 CN CN2012201139272U patent/CN202474885U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624026A (en) * | 2012-03-23 | 2012-08-01 | 广东工业大学 | Variable speed wind-power system based on variable frequency transformer and control method of variable speed wind-power system |
| CN113358975A (en) * | 2021-06-11 | 2021-09-07 | 南方电网数字电网研究院有限公司 | Fault detection method and device for power transmission network, computer equipment and storage medium |
| CN113358975B (en) * | 2021-06-11 | 2023-01-20 | 南方电网数字电网研究院有限公司 | Fault detection method and device for power transmission network, computer equipment and storage medium |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20140323 |