CN101383580A - Low voltage traversing control method for double feeding wind power generator when short circuit failure of electric network - Google Patents

Low voltage traversing control method for double feeding wind power generator when short circuit failure of electric network Download PDF

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Publication number
CN101383580A
CN101383580A CNA2008102329094A CN200810232909A CN101383580A CN 101383580 A CN101383580 A CN 101383580A CN A2008102329094 A CNA2008102329094 A CN A2008102329094A CN 200810232909 A CN200810232909 A CN 200810232909A CN 101383580 A CN101383580 A CN 101383580A
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rotor
current
axle
component
generator
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CNA2008102329094A
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CN101383580B (en
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姚骏
向大为
廖勇
刘刃
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Chongqing University
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Chongqing University
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Abstract

The invention discloses a low voltage ride-through control method of a doubly fed induction aero-generator, which is used when a power network has short circuit faults. The control method is characterized in that a rotor exciting voltage positive-sequence control current and a rotor exciting voltage negative-sequence control signal are respectively formed through limiting a rotor slip frequency current and a rotor (2-s) rated frequency current when the power network has faults, and a generator is utilized for realizing the attenuation of stator flux transient DC components and reducing the rotor side influences of the stator flux transient components, positive-sequence components and negative-sequence components. The control method has the advantages that no hardware protecting device is required to be added; under the condition that the power network has symmetrical and asymmetrical faults, the overcurrent occurrence of the rotor can be effectively restrained, and the safe operations of the generator and a rotor exciting converter are protected; in the process that the power network has the faults, the transient generator impact to the power network and a mechanical system can be effectively reduced; the normal operation of the generator can be fast recovered after the faults are removed, and the timely support to the power network can be realized.

Description

Double-fed induction wind driven generator low voltage traversing control method during short circuit malfunction
Technical field
The present invention relates to double-fed induction wind driven generator operation control field, the double-fed induction wind driven generator low voltage traversing control method when particularly relating to a kind of short circuit malfunction.
Background technology
Double fed induction generators with its advanced person flexibly operation characteristic in large-sized speed-changing constant-frequency wind turbine generator group, obtain broad research and application.Along with increasing double-fed induction wind driven generator group inserts operation of power networks, electrical network requires also more and more higher to the double fed induction generators that is incorporated into the power networks.Angle from the power system stability operation, the system requirements generating set still can keep being connected when electric network fault with system, and behind failure removal, recover set end voltage as early as possible, and keep system stable operation, double-fed induction wind-powered electricity generation unit should possess low voltage ride-through capability when promptly requiring electric network fault.
Generator ran without interruption during the above commercial double-fed induction wind driven generator group of MW level mainly adopted rotor short-circuit resist technology (Crowbar Protection) to realize electric network fault at present.This technology is excised generator excitation power when electric network fault, utilize the rotor by-pass protective resistance to release energy to reduce the rotor overcurrent, and the high power device in protection rotor-exciting loop is kept not off-grid operation of generator.
" Crowbar Protection " of the prior art control method also has the following disadvantages at present: 1. needing increases new hardware protection device, thereby has increased system cost and control difficulty; 2. generator is done the induction machine operation when electric network fault, and unit will absorb a large amount of reactive powers from electrical network, and this is unfavorable to line voltage stability; 3. in the failure process generator to the transient state electromagnetic impact of electrical network and all more serious to the mechanical shock of wind energy conversion system.
Summary of the invention
Double-fed induction wind driven generator low voltage traversing control method when the purpose of this invention is to provide a kind of short circuit malfunction.This control method need not to increase any hardware protection device, and system realizes simple, the reliability height; Under electrical network symmetry and asymmetric fault situation, all can effectively suppress rotor and overcurrent occur, protection generator and the safe operation of rotor-exciting frequency converter; Can effectively reduce generator in the electric network fault process transient state of electrical network and mechanical system is impacted, generator can recover normal operation rapidly behind the failure removal, realizes the timely support to electrical network.
Purpose of the present invention can come to be realized by the following technical programs.
(a), obtain rotor current blended space vector under the stator axis system by detection rotor electric current and rotor position angle;
(b), be α axle rotor current component and β axle rotor current component with the rotor current blended space resolution of vectors down of stator axis system, these two components obtain α axle rotor current alternating current component and β axle rotor current alternating current component after passing through the band pass filter that cut-off frequency is 50Hz respectively;
(c), α axle rotor current alternating current component and β axle rotor current alternating current component obtain being rotated in the forward rotor current d axle component and q axle component under the coordinate system after being rotated in the forward coordinate transform, these two components obtain rotor forward-order current d axle component and q axle component respectively after cut-off frequency is the notch filter of 100Hz; α axle rotor current alternating current component and β axle rotor current alternating current component are through obtaining rotor current d axle component and the q axle component under the reverse rotation coordinate system after the reverse rotation coordinate transform, these two components obtain rotor negative-sequence current d axle component and q axle component respectively after cut-off frequency is the notch filter of 100Hz;
(d), the set point of rotor forward-order current d axle component and q axle component and rotor negative-sequence current d axle component and q axle component all is set at 0, by these four amounts being carried out to obtain rotor positive sequence control voltage d axle component and q axle component and rotor negative phase-sequence control voltage d axle component and q axle component after PI regulates;
(e), rotor positive sequence control voltage vector and rotor negative phase-sequence are controlled the rotor control voltage vector that obtains after voltage vector synthesizes under the stator axis system, its rotor that carries out obtaining under the rotor axial system after the Rotating Transition of Coordinate is controlled voltage vector, this voltage vector is carried out can obtaining the control of three-phase rotor control voltage signal realization to the rotor-side converter after amplitude limit and the ovennodulation processing.
Description of drawings
Double fed induction generators low-voltage when Fig. 1 is short circuit malfunction is passed through the control block diagram.
Fig. 2 is the operational effect figure of active power, stator voltage, rotor voltage and the electromagnetic torque of the double-fed induction wind driven generator of employing " Crowbar Protection " method under the electrical network symmetric fault.
Fig. 3 is the operational effect figure of reactive power, stator current, rotor current and the rotating speed of the double-fed induction wind driven generator of employing " Crowbar Protection " method under the electrical network symmetric fault.
Fig. 4 is the operational effect figure of active power, stator voltage, rotor voltage and the electromagnetic torque of the double-fed induction wind driven generator of employing the inventive method under the electrical network symmetric fault.
Fig. 5 is the operational effect figure of reactive power, stator current, rotor current and the rotating speed of the double-fed induction wind driven generator of employing the inventive method under the electrical network symmetric fault.
Fig. 6 is the operational effect figure of active power, stator voltage, rotor voltage and the electromagnetic torque of the double-fed induction wind driven generator of employing " Crowbar Protection " method under the electrical network two relative ground circuit faults.
Fig. 7 is the operational effect figure of reactive power, stator current, rotor current and the rotating speed of the double-fed induction wind driven generator of employing " Crowbar Protection " method under the electrical network two relative ground circuit faults.
Fig. 8 is the operational effect figure of active power, stator voltage, rotor voltage and the electromagnetic torque of the double-fed induction wind driven generator of employing the inventive method under the electrical network two relative ground circuit faults.
Fig. 9 is the operational effect figure of reactive power, stator current, rotor current and the rotating speed of the double-fed induction wind driven generator of employing the inventive method under the electrical network two relative ground circuit faults.
Figure 10 is the operational effect figure of active power, stator voltage, rotor voltage and the electromagnetic torque of the double-fed induction wind driven generator of employing " Crowbar Protection " method under the single-phase shorted to earth fault of electrical network.
Figure 11 is the operational effect figure of reactive power, stator current, rotor current and the rotating speed of the double-fed induction wind driven generator of employing " Crowbar Protection " method under the single-phase shorted to earth fault of electrical network.
Figure 12 is the operational effect figure of active power, stator voltage, rotor voltage and the electromagnetic torque of the double-fed induction wind driven generator of employing the inventive method under the single-phase shorted to earth fault of electrical network.
Figure 13 is the operational effect figure of reactive power, stator current, rotor current and the rotating speed of the double-fed induction wind driven generator of employing the inventive method under the single-phase shorted to earth fault of electrical network.
Figure 14 is the operational effect figure of active power, stator voltage, rotor voltage and the electromagnetic torque of the double-fed induction wind driven generator of employing " Crowbar Protection " method under the electrical network phase fault.
Figure 15 is the operational effect figure of reactive power, stator current, rotor current and the rotating speed of the double-fed induction wind driven generator of employing " Crowbar Protection " method under the electrical network phase fault.
Figure 16 is the operational effect figure of active power, stator voltage, rotor voltage and the electromagnetic torque of the double-fed induction wind driven generator of employing the inventive method under the electrical network phase fault.
Figure 17 is the operational effect figure of reactive power, stator current, rotor current and the rotating speed of the double-fed induction wind driven generator of employing the inventive method under the electrical network phase fault.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the present invention is further described.
In the present invention, by the synthetic rotor current blended space vector that obtains under the rotor axial system of detection rotor electric current be
Wherein, i Ra, i Rb, i RcBe respectively the rotor three-phase transient current, I rBe the amplitude of rotor current space vector, θ rBe the position angle of rotor current space vector under rotor axial system.
Rotor current space vector and detected rotor position angle θ nBe rotated the rotor current blended space vector that can obtain after the conversion under the stator axis system It is decomposed to obtain the component of rotor current under the static α of stator, β axle system With Promptly
I r s = I r r e j θ n = I rα s + j I rβ s
With In contain DC component, positive sequence and negative sequence component, DC component and higher harmonic components in can the filtering rotor current after utilizing cut-off frequency for the band pass filter of 50Hz, only remaining rotor current α axis AC component and the β axis AC component that contains positive sequence and negative sequence component of its output: With At this moment rotor current space vector can be expressed as
I rAC s = I rαAC s + j I rβAC s
In the formula, The rotor current space vector after the DC component is removed in expression.
To α axle rotor current alternating current component With β axle rotor current alternating current component After being rotated in the forward coordinate transform, obtain being rotated in the forward the rotor current d axle component under the coordinate system With q axle component These two components obtain rotor forward-order current d axle component respectively after cut-off frequency is the notch filter of 100Hz With q axle component α axle rotor current alternating current component With β axle rotor current alternating current component Through obtaining the rotor current d axle component under the reverse rotation coordinate system after the reverse rotation coordinate transform With q axle component These two components obtain rotor negative-sequence current d axle component amount respectively after cut-off frequency is the notch filter of 100Hz With q axle component
The set point of rotor forward-order current d axle component and q axle component and rotor negative-sequence current d axle component and q axle component all is set at 0, by to four direct-current component With Carry out to obtain after PI regulates rotor positive sequence control voltage d axle component respectively With q axle component And rotor negative phase-sequence control voltage d axle component With q axle component Obtain the positive sequence control signal of rotor voltage after these four control components are synthetic respectively With the negative phase-sequence control signal With rotor positive sequence control voltage vector With rotor negative phase-sequence control voltage vector Obtain the rotor control voltage vector under the stator axis system after synthetic Its rotor that carries out obtaining under the rotor axial system after the Rotating Transition of Coordinate is controlled voltage vector This voltage vector is carried out can obtaining the control of three-phase rotor control voltage signal realization to the rotor-side converter after amplitude limit and the ovennodulation processing.
During " Crowbar Protection " method of employing, the generator operational effect is shown in accompanying drawing 2, accompanying drawing 3 under the symmetrical short-circuit failure condition that obtains.The electromagnetic torque peak value of generator reaches 2.22pu after electric network fault takes place, the bigger active power of generator unit stator side's output, generator produces bigger stator current (maximum is 3.09pu) and rotor current (maximum is 3.21pu), and this will very easily damage the power device of field power supply; Work as failure removal, after stator voltage was recovered, generator was done the induction generator operation, absorbs a large amount of idle excitations from system, produced bigger stator and rotor electric current and active power simultaneously.And when adopting the inventive method, the generator operational effect is shown in accompanying drawing 4, accompanying drawing 5 under the symmetrical short-circuit failure condition that obtains.The electromagnetic torque peak value that the back generator takes place electric network fault is 1.52pu, and the output of stator active power reduces rapidly, and reactive power has certain fluctuation and returns to immediately about zero.The stator current maximum is 1.93pu, and the rotor current maximum is 1.94pu, and it is limited in 2 times of peak current ratings effectively; Behind failure removal, stator voltage returns to rated value again, and generator unit stator electric current and rotor current all are limited within the safe range.Meritorious and the reactive power of generator progressively reaches stable after through certain fluctuation, and the reactive power that generator absorbs from electrical network is less and certain active power support can be provided.After the failure excitation control procedure finished, generator was again with the specified meritorious and electromagnetic torque of power factor 1 output, for the stable operation of electrical network after the fault provides necessary support.
During " Crowbar Protection " method of employing, the generator operational effect is shown in accompanying drawing 6, accompanying drawing 7 under the electrical network two relative ground circuit situations that obtain.Surpass current limit value when back rotor current peak value takes place electric network fault, reach 3.43pu, electromagnetic torque fluctuation is very big, and meritorious and reactive power fluctuation generator greatly and behind failure removal absorbs a large amount of idle excitations from system.And when adopting the inventive method, the generator operational effect is shown in accompanying drawing 8, accompanying drawing 9 under the electrical network two relative ground circuit situations that obtain.Industrial frequency AC positive sequence and negative sequence component after electric network fault takes place in the stator current are all effectively limited, and the rotor current peak value is 1.94pu, successfully is controlled in 2 times of peak current ratings.The generator electromagnetic torque fluctuation is less, behind failure removal, only absorb from system idle on a small quantity, to the transient state electromagnetic impact of system and all less to the mechanical shock of wind energy conversion system.
During " Crowbar Protection " method of employing, the generator operational effect is shown in accompanying drawing 10, accompanying drawing 11 under the single-phase shorted to earth failure condition of the electrical network that obtains.And when adopting the inventive method, the generator operational effect is shown in accompanying drawing 12, accompanying drawing 13 under the single-phase shorted to earth failure condition of the electrical network that obtains.During " CrowbarProtection " method of employing, the generator operational effect is shown in accompanying drawing 14, accompanying drawing 15 under the electrical network phase fault situation that obtains.And when adopting the inventive method, the generator operational effect is shown in accompanying drawing 16, accompanying drawing 17 under the electrical network phase fault situation that obtains.Similar with electrical network two relative ground circuit failure conditions, during " Crowbar Protection " method of employing, the rotor current peak value surpasses current limit value, and electromagnetic torque fluctuation is very big, meritorious and the reactive power fluctuation is big and behind failure removal generator absorb a large amount of idle excitations from system.And when adopting the inventive method, the rotor current peak value successfully is controlled in 2 times of peak current ratings.The generator electromagnetic torque fluctuation is less, and generator is to the transient state electromagnetic impact of system and all less to the mechanical shock of wind energy conversion system.
Control method provided by the invention, be applicable to the various types of short troubles of electrical network, when the serious rapid drawdown of generator unit stator voltage, all can effectively limit the stator current power frequency component, suppress rotor and overcurrent occurs, protect the rotor-exciting frequency converter effectively, made generator can realize that low-voltage passes through operation; Compare with traditional method, the generator of employing the inventive method impacts the transient state of electrical network and mechanical system and all is controlled to low limit in the electric network fault process, generator absorbs a small amount of idle and can recover rapidly normally to move behind failure removal from system, realization is to the timely support of electrical network.

Claims (1)

1, the double-fed induction wind driven generator low voltage traversing control method during a kind of short circuit malfunction is characterized in that this control method comprises following steps successively:
(a), obtain rotor current blended space vector under the stator axis system by detection rotor electric current and rotor position angle;
(b), be α axle rotor current component and β axle rotor current component with the rotor current blended space resolution of vectors down of stator axis system, these two components obtain α axle rotor current alternating current component and β axle rotor current alternating current component after passing through the band pass filter that cut-off frequency is 50Hz respectively;
(c), α axle rotor current alternating current component and β axle rotor current alternating current component obtain being rotated in the forward rotor current d axle component and q axle component under the coordinate system after being rotated in the forward coordinate transform, these two components obtain rotor forward-order current d axle component and q axle component respectively after cut-off frequency is the notch filter of 100Hz; α axle rotor current alternating current component and β axle rotor current alternating current component are through obtaining rotor current d axle component and the q axle component under the reverse rotation coordinate system after the reverse rotation coordinate transform, these two components obtain rotor negative-sequence current d axle component and q axle component respectively after cut-off frequency is the notch filter of 100Hz;
(d), the set point of rotor forward-order current d axle component and q axle component and rotor negative-sequence current d axle component and q axle component all is set at 0, by these four amounts being carried out to obtain rotor positive sequence control voltage d axle component and q axle component and rotor negative phase-sequence control voltage d axle component and q axle component after PI regulates;
(e), rotor positive sequence control voltage vector and rotor negative phase-sequence are controlled the rotor control voltage vector that obtains after voltage vector synthesizes under the stator axis system, its rotor that carries out obtaining under the rotor axial system after the Rotating Transition of Coordinate is controlled voltage vector, this voltage vector is carried out can obtaining the control of three-phase rotor control voltage signal realization to the rotor-side converter after amplitude limit and the ovennodulation processing.
CN2008102329094A 2008-10-22 2008-10-22 Low voltage traversing control method for double feeding wind power generator when in short circuit failure of electric network Expired - Fee Related CN101383580B (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101789604A (en) * 2010-03-10 2010-07-28 深圳市禾望电气有限公司 Method for judging severity of grid voltage dip
CN101860040A (en) * 2010-05-04 2010-10-13 合肥阳光电源有限公司 Rotor-side converter of double-fed wind generating set for low voltage ride through and rapid restarting method thereof
CN102005998A (en) * 2010-11-23 2011-04-06 中国科学院电工研究所 Low-voltage ride through circuit of double-feed type wind power generator
CN102055208A (en) * 2010-12-31 2011-05-11 清华大学 Low-voltage traversing control method for double-fed wind power generation system
CN102437811A (en) * 2011-09-26 2012-05-02 重庆大学 Low voltage ride through control method of permanent magnet direct drive wind power generation system with flywheel energy storage unit during power grid symmetrical short circuit default
WO2012073504A2 (en) 2010-11-30 2012-06-07 Mitsubishi Heavy Industries, Ltd. Power generating apparatus of renewable energy type and operation method thereof
CN103219735A (en) * 2013-04-09 2013-07-24 国家电网公司 Method and system for inhibiting total active power fluctuation through doubly fed induction wind power system
CN103269088A (en) * 2013-05-29 2013-08-28 合肥工业大学 Double-fed type wind generating set low-voltage-ride-through control method based on electromagnetic transient algorithm
CN102097816B (en) * 2009-12-14 2013-10-02 徐隆亚 Low-voltage traversing control method for double-fed wind power generation system
US8622719B2 (en) 2010-11-30 2014-01-07 Mitsubishi Heavy Industries, Ltd. Hydraulic pump structure for wind turbine generator or tidal current generator and method of mounting hydraulic pump
CN104865523A (en) * 2015-01-22 2015-08-26 华北电力大学 Doubly-fed generator simulation system and method
EP2448079A3 (en) * 2010-10-29 2017-06-28 General Electric Company Method and System for Providing Increased Turbine Output for Doubly Fed Induction Generator

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102097816B (en) * 2009-12-14 2013-10-02 徐隆亚 Low-voltage traversing control method for double-fed wind power generation system
CN101789604A (en) * 2010-03-10 2010-07-28 深圳市禾望电气有限公司 Method for judging severity of grid voltage dip
CN101789604B (en) * 2010-03-10 2012-03-28 深圳市禾望电气有限公司 Method for judging severity of grid voltage dip
CN101860040B (en) * 2010-05-04 2012-08-29 阳光电源股份有限公司 Rotor-side converter of double-fed wind generating set for low voltage ride through and rapid restarting method thereof
CN101860040A (en) * 2010-05-04 2010-10-13 合肥阳光电源有限公司 Rotor-side converter of double-fed wind generating set for low voltage ride through and rapid restarting method thereof
EP2448079A3 (en) * 2010-10-29 2017-06-28 General Electric Company Method and System for Providing Increased Turbine Output for Doubly Fed Induction Generator
CN102005998A (en) * 2010-11-23 2011-04-06 中国科学院电工研究所 Low-voltage ride through circuit of double-feed type wind power generator
US8622719B2 (en) 2010-11-30 2014-01-07 Mitsubishi Heavy Industries, Ltd. Hydraulic pump structure for wind turbine generator or tidal current generator and method of mounting hydraulic pump
WO2012073504A2 (en) 2010-11-30 2012-06-07 Mitsubishi Heavy Industries, Ltd. Power generating apparatus of renewable energy type and operation method thereof
CN102055208A (en) * 2010-12-31 2011-05-11 清华大学 Low-voltage traversing control method for double-fed wind power generation system
CN102055208B (en) * 2010-12-31 2013-01-16 清华大学 Low-voltage traversing control method for double-fed wind power generation system
CN102437811B (en) * 2011-09-26 2013-07-17 重庆大学 Low voltage ride through control method of permanent magnet direct drive wind power generation system during power grid symmetrical short circuit default
CN102437811A (en) * 2011-09-26 2012-05-02 重庆大学 Low voltage ride through control method of permanent magnet direct drive wind power generation system with flywheel energy storage unit during power grid symmetrical short circuit default
CN103219735B (en) * 2013-04-09 2015-08-26 国家电网公司 Double-fed induction wind power system suppresses the method and system of total active power fluctuation
CN103219735A (en) * 2013-04-09 2013-07-24 国家电网公司 Method and system for inhibiting total active power fluctuation through doubly fed induction wind power system
CN103269088A (en) * 2013-05-29 2013-08-28 合肥工业大学 Double-fed type wind generating set low-voltage-ride-through control method based on electromagnetic transient algorithm
CN104865523A (en) * 2015-01-22 2015-08-26 华北电力大学 Doubly-fed generator simulation system and method

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