CN101888093A - Low voltage ride through analogue system of wind generation system - Google Patents
Low voltage ride through analogue system of wind generation system Download PDFInfo
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- CN101888093A CN101888093A CN2010101915902A CN201010191590A CN101888093A CN 101888093 A CN101888093 A CN 101888093A CN 2010101915902 A CN2010101915902 A CN 2010101915902A CN 201010191590 A CN201010191590 A CN 201010191590A CN 101888093 A CN101888093 A CN 101888093A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention provides a low voltage ride through analogue system of a wind generation system for simulating the wind power by using an electric motor. The low voltage ride through analogue system comprises a main transformer, a complete wind generator to be detected and power grid control unit, wherein the main transformer is used for transforming the voltage of an output power grid, and a power grid control unit is used for pulling down the voltage of the power grid. The low voltage ride through analogue system is characterized by further comprising an electric motor system, and the electric motor system comprises a stepless variable speed controller, a driving motor and a gearbox; the stepless variable speed controller is electrically connected with the output end of the main transformer; the gearbox is connected with the output shaft of the driving motor; the power grid control unit comprises an isolation transformer, a current-limiting reactance switch cabinet CB3, an incoming switch cabinet CB1 and a short-circuit reactance switch cabinet CB2. The driving motor is connected with the complete wind generator to simulate the outside wind power so that the low voltage ride through analogue system of the wind generation system of the invention can work in any period of time more efficiently and analog the work efficiency and has higher analogue precision.
Description
Technical field
The low pressure that the present invention relates to a kind of wind generator system is passed through analogue system, in particular, relates in particular to a kind of low pressure of utilizing motor to simulate the wind generator system of wind-force and passes through analogue system.
Background technology
Wind turbine generator more and more is subject to people's attention to the quality of the electric energy that electrical network is sent, and therefore Utilities Electric Co. has also proposed more harsh requirement to the service behaviour of wind turbine generator under the power network fluctuation situation.The national grid management regulation progressively forms these years, and purpose just is to limit the adverse effect to electrical network that is incorporated into the power networks on a large scale and is caused by wind-powered electricity generation.
The electric energy that provides of wind power generation was normally very little in the past, in this case, when electric network fault took place, the automatic excision of wind turbine generator can not influence the stabilization of power grids basically, can allow wind energy turbine set to break down and excise during disturbance, can not lead to grave consequences at electrical network.But, when the installation ratio of wind-driven generator is higher, particularly during the high wind speed, because a large amount of wind-driven generators that the power transmission network fault causes excision from the electrical network can cause the significantly variation of system load flow, may cause large-area power failure, and bring the stable problem of frequency.Along with the capacity of wind-driven generator is increasing year by year, wind-driven generator excises the generation of the accident that will cause power failure when electric network fault, and electrical network generation electric voltage dropping is bigger to the influence of wind-powered electricity generation unit, and for example, imbalance mechanical, electric power can influence the stable operation of unit; Transient process causes occurring in the generator overcurrent, may damage device; Additional torque, stress may damage mechanical part.So low voltage ride-through capability is essential.
But, the low pressure of existing wind generator system is passed through the also imperfection of ten minutes of analogue system, ways more both domestic and external are to make a container at present, transporting to wind field then goes to simulate low-voltage and passes through test, adopt this method to have drawback, the one, when going wrong, keep in repair inconvenience in the open air and cost is higher; The 2nd, because what utilize is natural wind on the wind field, this just makes and very low of simulation precision that existing low pressure passes through analogue system is subjected to the restriction of environment bigger.
Summary of the invention
The present invention is in order to overcome the shortcoming of above-mentioned technical problem, provides a kind of low pressure of the wind generator system of the wind generator system that motor simulates wind-force of utilizing to pass through analogue system.
The low pressure of wind generator system of the present invention is passed through analogue system, comprise and be used for the transmission of electricity electrical network is carried out main transformer, the wind power generation complete machine to be detected of transformation and the power grid control unit of the line voltage that is used to leave behind, its special feature is: also comprise electric motor system, this electric motor system comprises that the cvt controller, drive motors and the gearbox that is connected with the output shaft of drive motors, the output shaft of described gearbox that are electrically connected with the output of main transformer are connected with the power shaft of wind power generation complete machine; The voltage output end of described wind power generation complete machine is connected with the blower fan current transformer, and the output of this blower fan current transformer is connected with the power grid control unit; Described power grid control unit comprises isolating transformer, current-limiting reactor switch cubicle CB3, service entrance switch cabinet CB1, short-circuit reactance switch cubicle CB2, described isolating transformer input is connected with the output of blower fan current transformer, the output of isolating transformer is connected with main transformer through current limiting reactor, described current-limiting reactor switch cubicle CB3 and service entrance switch cabinet CB1 all are in parallel with current limiting reactor, and described short-circuit reactance switch cubicle CB2 is connected between isolating transformer and the current limiting reactor.Main transformer can be realized the high voltage of transmission of electricity electrical network is converted into low-voltage, so that to drive motors power supply, the power delivery that main transformer also can send the wind power generation complete machine is to the transmission of electricity electrical network; Cvt controller can be realized the control to drive motors, through the acting in conjunction of cvt controller and torque sensor, reaches the purpose of controlling and driving motor output shaft rotating speed.The blower fan current transformer is used for the electric energy that the blower fan current transformer produces is carried out rectification, Filtering Processing, makes it reach the condition that is transported on the transmission of electricity electrical network.The power grid control unit is mainly used in leaves behind the magnitude of voltage of electrical network, and on official hour point again the voltage electrical network recover; Under the normal situation of simulation electrical network, current-limiting reactor switch cubicle CB3 and service entrance switch cabinet CB1 all are in "on" position, and short-circuit reactance switch cubicle CB2 is in gate-dividing state; The simulation line voltage descend suddenly, when promptly low pressure is passed through, at first should close a floodgate short-circuit reactance switch cubicle CB2, and then in official hour short-circuit reactance switch cubicle CB2 separating brake.
The low pressure of wind generator system of the present invention is passed through analogue system, and described cvt controller comprises rectification unit, dc bus and inversion unit; The connecting axle of the output of described gearbox and wind power generation complete machine is provided with torque sensor; Be provided with high-tension switch cabinet between described main transformer and the transmission of electricity electrical network, be provided with the auxiliary connection cabinet between described blower fan current transformer and the isolating transformer, be provided with low-tension switch cabinet between described main transformer and the power grid control unit.Through the acting in conjunction of cvt controller and torque sensor, reach the purpose of controlling and driving motor output shaft rotating speed; The purpose that high-tension switch cabinet, auxiliary connection cabinet and low-tension switch cabinet are set is for the power grid security protection, and the quality of power supply is surveyed monitoring and made things convenient for being electrically connected and maintenance of equipment of native system.
The low pressure of wind generator system of the present invention is passed through analogue system, and described short-circuit reactance switch cubicle CB2 is connected with ground after via short-circuit impedance, and described short-circuit impedance is parallel with continued flow resistance.When short-circuit reactance switch cubicle CB2 closes a floodgate, by the acting in conjunction of short-circuit impedance and continued flow resistance, can move the magnitude of voltage on the electrical network to original 20% so that the voltage drop in the simulation actual electric network.In the process of simulation, the decline of line voltage is not to realize by the voltage that reduces on the electrical network, but simulates by reducing through the voltage on the electrical network after the main transformer, and its action effect is the same.
The low pressure of wind generator system of the present invention is passed through analogue system, and the output of described main transformer is 690 volts, the alternating current of 50Hz.
The invention has the beneficial effects as follows: adopt the drive motors that is connected with the wind power generation complete machine to simulate extraneous wind-force, and carry out the simulation of different wind speed by cvt controller, make the low pressure of wind generator system of the present invention pass through analogue system and can both work in the section at any time, improved operating efficiency and accuracy of simulation; Analogue system of the present invention is in the simulation low-voltage when passing through, change be not the transmission of electricity line voltage, but the voltage of transmission of electricity electrical network after transformation makes power grid control of the present invention unit work under low-voltage and gets final product; Short-circuit reactance switch cubicle CB2 of the present invention can carry out the control of Millisecond precision, makes that the simulation of native system is more approaching actual.
Description of drawings
Fig. 1 is a circuit theory schematic diagram of the present invention;
Fig. 2 is the change curve of analogue system of the present invention point voltage that is incorporated into the power networks of being collected in the process of experiment;
Among the figure: 1 transmission of electricity electrical network, 2 high-tension switch cabinets, 3 main transformers, 4 rectification units, 5 dc buss, 6 inversion units, 7 drive motors, 8 gearboxes, 9 torque sensors, 10 wind power generation complete machines, 11 blower fan current transformers, 12 auxiliary connection cabinets, 13 isolating transformers, 14 low-tension switch cabinets, 15 current-limiting reactor switch cubicle CB3,16 service entrance switch cabinet CB1,17 short-circuit reactance switch cubicle CB2,18 continued flow resistance R2,19 current limiting reactors, 20 short-circuit impedances, 21 continued flow resistances.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, the low pressure of wind generator system of the present invention is passed through analogue system, comprises transmission of electricity electrical network 1, high-tension switch cabinet 2, main transformer 3, cvt controller, drive motors 7, gearbox 8, torque sensor 9, wind power generation complete machine 10, blower fan current transformer 11, auxiliary connection cabinet 12, low-tension switch cabinet 14, power grid control unit.Shown cvt controller comprises rectification unit 4, dc bus 5, inversion unit 6.Shown in the dotted portion among Fig. 1, give the circuit theory diagrams of having located the power grid control unit, it comprises isolating transformer 13, current-limiting reactor switch cubicle CB315, service entrance switch cabinet CB116, short-circuit reactance switch cubicle CB217, continued flow resistance R218, current limiting reactor 19, short-circuit impedance 20, continued flow resistance 21.
Transmission of electricity electrical network 1 voltage can be 10KV, 35KV or other voltages to be detected, its frequency is 50Hz, transmission of electricity electrical network 1 is connected to the input of main transformer 3 behind high-tension switch cabinet 2, the output of main transformer 3 is 690 volts, the alternating voltage of 50Hz, the power supply and the outage that can realize whole analogue system respectively by the combined floodgate and the separating brake of high-tension switch cabinet 2, the input of the output of main transformer 3 and the rectification unit of cvt controller 4 is electrically connected, the output of rectification unit 4 is connected with dc bus, can be converted into alternating current to direct current by inversion unit 6, receive the voltage input end of drive motors 7, in the process of using, can change the rotating speed of drive motors 7 by cvt controller, and then realize the simulation of different wind speed.The output of drive motors 7 is connected with wind power generation complete machine 10 inputs after gearbox 8 slows down again, connecting axle between gearbox 8 and the wind power generation complete machine 10 is provided with torque sensor 9, can measure the size that drive motors 7 passes to wind power generation complete machine 10 by torque sensor 9, and collaborative cvt controller is realized the simulation generating of wind power generation complete machine under different wind speed.
The electric energy output end of wind power generation complete machine 10 is connected with the input of blower fan current transformer 11, the effect of blower fan current transformer is that the voltage that blower fan generating complete machine 10 sends is carried out rectification, processing such as filtering, make it become 690 volts, the alternating current of 50Hz, blower fan current transformer 11 is connected with isolating transformer 13 in the power grid control unit behind auxiliary connection cabinet 12, if auxiliary connection cabinet 12 separating brakes, then the electricity that is sent by wind power generation complete machine 10 is not connected with the power grid control unit, if auxiliary connection cabinet 12 closes a floodgate, then the electricity that is sent by wind power generation complete machine 10 is linked into the power grid control unit, and is transported on the transmission of electricity electrical network.Isolating transformer 13 is connected with main transformer 3 behind current limiting reactor 19 and low-tension switch cabinet 14 successively, and service entrance switch cabinet CB1 and current limiting reactor 19 are in parallel, current-limiting reactor switch cubicle CB3 be in parallel with current limiting reactor 19 again after continued flow resistance 18 is connected.Short-circuit reactance switch cubicle CB2 one terminates on isolating transformer 13 and the lead that current limiting reactor 19 is connected, the other end back ground connection that links to each other with short-circuit impedance 20, and the two ends of short-circuit impedance 20 also are parallel with continued flow resistance 21.The value of current limiting reactor 19 and short-circuit impedance 20 can be elected 0.15mh and 0.04mh respectively as, so as to realize respectively line voltage drop-down be original 20% and in the time of 3S answer be more than 90% of original voltage.
In the circuit theory schematic diagram of the present invention shown in Fig. 1, shown main transformer 3 be connected with circuit between the drive motors 7 and wind-driven generator complete machine 10 with output be connected with circuit between the main transformer 3, what provide all is the conversion and the schematic diagram that is connected of the phase voltage in the three-phase.
Passing through analogue system by pressure of the present invention carries out low pressure to pass through experimental procedure as follows:
At first, guarantee that high-tension switch cabinet 2, auxiliary connection cabinet 12, low-tension switch cabinet 14, service entrance switch cabinet CB1, current-limiting reactor switch cubicle CB3 all are in "on" position, short-circuit reactance switch cubicle CB2 is in gate-dividing state, forms the generating current supply circuit so that guarantee whole analogue system;
When experiment, control action by control circuit among the short-circuit reactance switch cubicle CB2, control short-circuit reactance switch cubicle CB2 closes a floodgate, at this moment because the drop-down effect of short-circuit impedance 20 and continued flow resistance 21, make line voltage drop-down, and the operational factor of wind power generation complete machine 10 is detected for original 20%; Behind the short-circuit reactance switch cubicle CB2 combined floodgate 625ms, control short-circuit reactance switch cubicle CB2 separating brake, and simultaneously the operational factor of wind power generation complete machine 10 and the point voltage that is incorporated into the power networks are detected.
As shown in Figure 2, in the process of experiment, when the point voltage that is incorporated into the power networks fell to 20% rated voltage (former line voltage), the wind power generation complete machine should be able to keep the 625ms that is incorporated into the power networks; The electrical network point voltage that is incorporated into the power networks can return to 90% o'clock of rated voltage in the 3s falling the back, and the wind power generation complete machine can keep being incorporated into the power networks.
Claims (4)
1. the low pressure of a wind generator system is passed through analogue system, comprise and be used for transmission of electricity electrical network (1) is carried out main transformer (3), the wind power generation complete machine (10) to be detected of transformation and the power grid control unit of the line voltage that is used to leave behind, it is characterized in that: also comprise electric motor system, this electric motor system comprises cvt controller, drive motors that is electrically connected with the output of main transformer (3) and the gearbox (8) that is connected with the output shaft of drive motors, and the output shaft of described gearbox (8) is connected with the power shaft of wind power generation complete machine (10); The voltage output end of described wind power generation complete machine (10) is connected with blower fan current transformer (11), and the output of this blower fan current transformer (11) is connected with the power grid control unit; Described power grid control unit comprises isolating transformer (13), current-limiting reactor switch cubicle CB3 (15), service entrance switch cabinet CB1 (16), short-circuit reactance switch cubicle CB2 (17), described isolating transformer (13) input is connected with the output of blower fan current transformer (11), the output of isolating transformer (13) is connected with main transformer (3) through current limiting reactor (19), described current-limiting reactor switch cubicle CB3 (15) and service entrance switch cabinet CB1 all are in parallel with current limiting reactor (19), and described short-circuit reactance switch cubicle CB2 (17) is connected between isolating transformer (13) and the current limiting reactor (19).
2. the low pressure of wind generator system according to claim 1 is passed through analogue system, it is characterized in that: described cvt controller comprises rectification unit (4), dc bus (5) and inversion unit (6); The connecting axle of the output of described gearbox (8) and wind power generation complete machine (10) is provided with torque sensor (9); Be provided with high-tension switch cabinet (2) between described main transformer (3) and the transmission of electricity electrical network (1), be provided with auxiliary connection cabinet (12) between described blower fan current transformer (11) and the isolating transformer (13), be provided with low-tension switch cabinet (14) between described main transformer (3) and the power grid control unit.
3. the low pressure of wind generator system according to claim 1 and 2 is passed through analogue system, it is characterized in that: described short-circuit reactance switch cubicle CB2 (17) is connected with ground via short-circuit impedance (20) back, and described short-circuit impedance (20) is parallel with continued flow resistance (21).
4. the low pressure of wind generator system according to claim 1 and 2 is passed through analogue system, it is characterized in that: the output of described main transformer (3) is 690 volts, the alternating current of 50Hz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101915902A CN101888093B (en) | 2010-06-04 | 2010-06-04 | Low voltage ride through analogue system of wind generation system |
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| CN2010101915902A CN101888093B (en) | 2010-06-04 | 2010-06-04 | Low voltage ride through analogue system of wind generation system |
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| CN101888093A true CN101888093A (en) | 2010-11-17 |
| CN101888093B CN101888093B (en) | 2012-09-05 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871997A (en) * | 2010-06-18 | 2010-10-27 | 深圳市禾望电气有限公司 | Device for testing power grid adaptability of wind generator set |
| CN102129036A (en) * | 2011-01-07 | 2011-07-20 | 中电普瑞科技有限公司 | Movable low-voltage ride-through testing device for wind generating set |
| CN102353863A (en) * | 2011-09-02 | 2012-02-15 | 中国科学院电工研究所 | Renewable energy source power generation synchronization test platform |
| CN102426308A (en) * | 2011-09-25 | 2012-04-25 | 国网电力科学研究院 | Low voltage ride-through testing method based on power grid voltage sag composite simulation structure |
| CN102508157A (en) * | 2011-11-03 | 2012-06-20 | 中国电力科学研究院 | Low-voltage ride-through testing system of wind generating set |
| CN103021241A (en) * | 2012-12-12 | 2013-04-03 | 山东大学 | Dynamic simulation system of low voltage electric power system |
| CN104520725A (en) * | 2013-03-13 | 2015-04-15 | 万银电力电子科技（北京）有限公司 | Device for generating disturbances in an electrical grid |
| WO2015070482A1 (en) * | 2013-11-14 | 2015-05-21 | 国家电网公司 | Low voltage ride through detection system suited for use in large-scale photovoltaic power stations in high-altitude regions |
| CN105140963A (en) * | 2015-09-21 | 2015-12-09 | 哈尔滨理工大学 | Doubly-fed wind generator system based on fault current-limiting control and low voltage ride through method |
| CN108199592A (en) * | 2017-12-19 | 2018-06-22 | 中国航天空气动力技术研究院 | The multi-modal rectification power circuit of high power DC electro-arc heater power supply |
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| CN201750162U (en) * | 2010-06-04 | 2011-02-16 | 济南轨道交通装备有限责任公司 | Low-voltage through simulation system of wind power generating system |
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| JP2007239599A (en) * | 2006-03-08 | 2007-09-20 | Mitsubishi Heavy Ind Ltd | Wind power generation system and method of supplying emergency power for wind power generation system |
| CN101299540A (en) * | 2007-04-30 | 2008-11-05 | 国网南京自动化研究院 | Apparatus for implementing low voltage cross-over of wind generator set |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871997A (en) * | 2010-06-18 | 2010-10-27 | 深圳市禾望电气有限公司 | Device for testing power grid adaptability of wind generator set |
| CN101871997B (en) * | 2010-06-18 | 2012-09-05 | 深圳市禾望电气有限公司 | Device for testing power grid adaptability of wind generator set |
| CN102129036A (en) * | 2011-01-07 | 2011-07-20 | 中电普瑞科技有限公司 | Movable low-voltage ride-through testing device for wind generating set |
| CN102353863A (en) * | 2011-09-02 | 2012-02-15 | 中国科学院电工研究所 | Renewable energy source power generation synchronization test platform |
| CN102353863B (en) * | 2011-09-02 | 2013-08-14 | 中国科学院电工研究所 | Renewable energy source power generation synchronization test platform |
| CN102426308A (en) * | 2011-09-25 | 2012-04-25 | 国网电力科学研究院 | Low voltage ride-through testing method based on power grid voltage sag composite simulation structure |
| CN102508157A (en) * | 2011-11-03 | 2012-06-20 | 中国电力科学研究院 | Low-voltage ride-through testing system of wind generating set |
| CN103021241A (en) * | 2012-12-12 | 2013-04-03 | 山东大学 | Dynamic simulation system of low voltage electric power system |
| CN104520725A (en) * | 2013-03-13 | 2015-04-15 | 万银电力电子科技（北京）有限公司 | Device for generating disturbances in an electrical grid |
| WO2015070482A1 (en) * | 2013-11-14 | 2015-05-21 | 国家电网公司 | Low voltage ride through detection system suited for use in large-scale photovoltaic power stations in high-altitude regions |
| CN105140963A (en) * | 2015-09-21 | 2015-12-09 | 哈尔滨理工大学 | Doubly-fed wind generator system based on fault current-limiting control and low voltage ride through method |
| CN108199592A (en) * | 2017-12-19 | 2018-06-22 | 中国航天空气动力技术研究院 | The multi-modal rectification power circuit of high power DC electro-arc heater power supply |
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