CN105071430B - Inhibit the method that Crowbar circuits damage in double-fed fan motor unit - Google Patents
Inhibit the method that Crowbar circuits damage in double-fed fan motor unit Download PDFInfo
- Publication number
- CN105071430B CN105071430B CN201510437253.XA CN201510437253A CN105071430B CN 105071430 B CN105071430 B CN 105071430B CN 201510437253 A CN201510437253 A CN 201510437253A CN 105071430 B CN105071430 B CN 105071430B
- Authority
- CN
- China
- Prior art keywords
- stator
- crowbar
- current
- formula
- rotor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Abstract
The present invention provides a kind of method inhibiting Crowbar circuits damage in double-fed fan motor unit, includes the following steps：Sensor acquires stator voltage, stator current, encoder angular value；Crowbar current values are estimated according to the stator voltage of sensor acquisition, stator current, encoder angular value：It determines that suitable Crowbar circuits turn off the moment according to Crowbar current values, is the shutdown moment of suitable Crowbar circuits when Crowbar current values are less than 700 900A.Input variable of the present invention is stator three-phase current, three-phase voltage, rotor electrical angle, these variables in order to control in use, be not necessarily to independent measurement；It can accurately estimate Crowbar current values, reference is provided for the Crowbar circuits shutdown moment, reduce the IGBT damages brought by the shutdown of Crowbar circuits；Crowbar current sensors are not needed simultaneously, reduce hardware cost.
Description
Technical field
The invention belongs to wind-power electricity generation, power electronic technique and the crossing domains of Control System Design, more particularly to one kind
Inhibit the method that Crowbar circuits damage in double-fed fan motor unit.
Background technology
Wind-power electricity generation is quickly grown, and various technologies are gradually improved.Main type of the double-fed fan motor unit as wind-power electricity generation,
Variable speed constant frequency generator is realized by back-to-back double PWM converters.In operational process, it often will appear electric network fault, unit needs to have
Standby low voltage crossing even no-voltage ride-through capability, the master of (rotor short-circuit protects circuit/crowbar circuit) as low voltage crossing
Component is wanted, critically important effect is played.It acts on mainly protection double-fed frequency converter, and ensures that unit passes through low-voltage and wears
More, and be easiest to damage component.So the damage of Crowbar circuits how to be inhibited to be known as the class that those skilled in the art study
Topic.
Invention content
The technical program will solve the problems, such as to be to provide a kind of method of inhibition Crowbar circuits damage.
To solve the above problems, the technical solution adopted by the present invention：
A kind of method that Crowbar circuits damage in inhibition double-fed fan motor unit, includes the following steps：
(1) sensor acquisition stator voltage, stator current, encoder angular value；
(2) Crowbar current values are estimated according to the stator voltage of sensor acquisition, stator current, encoder angular value：
(3) determine that suitable Crowbar circuits turn off the moment according to Crowbar current values, when Crowbar current values are less than
It it is the shutdown moment of suitable Crowbar circuits when 700-900A.
Preferably, the evaluation method of Crowbar current values is as follows：
S1. the calculating of stator-induced electromagnetic kinetic potential：
Sensor acquires threephase stator voltage Usa, Usb, Usc, and threephase stator electric current Isa, Isb, Isc become by 3s/2s
It changes, obtains stator voltage Us α, the Us β under two-phase stationary coordinate system, stator current Is α, Is β；
E α=Us α+Rs*Is α (1-1)
E β=Us β+Rs*Is β (1-2)
Stator-induced electromagnetic kinetic potential E α, E β is calculated according to formula (1-1) and (1-2).Rs is double feedback electric engine stator electricity in formula
Resistance；
S2. low-pass filter calculates：
E α _ compensation=E α+Gama*E β (2-1)
E β _ compensation=E β-Gama*E α (2-2)
Stator-induced electromagnetic kinetic potential E α, E β are compensated according to formula (2-1) and (2-2), the stator-induced electromagnetic after compensation is dynamic
Gesture E α _ compensation, E β _ compensation, Gama is penalty coefficient in formula, which determine the cutoff frequency of low-pass filtering, larger Gama values
It can accelerate the rate of decay of the low-pass filter to DC offset, but certain phase offset can be caused；
S3. stator magnetic linkage calculates:
According to formula (3-1) and (3-2), low-pass first order filter is passed through in E α _ compensation, E β _ compensation, and stator magnetic linkage is calculated
φsα、φsβ。For the transmission function of low-pass first order filter；
S4. the rotor current of conversion to stator side calculates:
Ir α _ s=(φ s α+Ls*Is α)/Lm (4-1)
Ir β _ s=(φ s β+Ls*Is β)/Lm (4-2)
According to formula (4-1) and (4-2), rotor current Ir α _ s, Ir β _ s that stator side is arrived in conversion is calculated, frequency is
Stator frequency 50Hz.Ls, Lm are respectively stator equivalent self inductance and equivalent mutual inductance in formula；
S5. rotor-sided rotor current calculates:
Ir α=- Vnom/Vo_r* [Ir α _ s*cos (θ r)+Ir β _ s*sin (θ r)] (5-1)
Ir β=- Vnom/Vo_r* [- Ir α _ s*sin (θ r)+Ir β _ s*cos (θ r)] (5-2)
According to formula (5-1) and (5-2), rotor current Ir α, the Ir β of rotor-side is calculated, Vnom is fixed for generator in formula
Sub- rated line voltage, Vo_r are generator amature open-circuit voltage, and θ r are that generator amature electrical angle=encoder angular is multiplied by electricity
Machine number of pole-pairs；
S6.Crowbar Current calculations:
Double fed electric machine rotor electric current Ir α, Ir β are converted by 2s/3s, obtain the rotor current under three-phase static coordinate system
Ira、Irb、Irc；
Crowbar electric currents can Approximate Equivalent be：
Icrowbar=Max (Abs (Ira), Abs (Irb), Abs (Irc)) (6-1)
Icrowbar is to estimate obtained Crowbar electric currents, and Max is to be maximized function in formula, and Abs is the letter that takes absolute value
Number.
Preferably, it is the pass of suitable Crowbar circuits when Crowbar current values are less than 700-800A in step (3)
The disconnected moment.
Preferably, in step (3), when Crowbar current values be less than 800A when for suitable Crowbar circuits shutdown when
It carves.
The invention has the advantages and positive effects that：The input variable of the present invention only needs stator three-phase current, stator three
Phase voltage, rotor electrical angle, and these variables in order to control in use, be not necessarily to independent measurement；It can accurately estimate Crowbar
Current value provides reference for the shutdown moment of Crowbar circuits, reduces the IGBT damages brought by the shutdown of Crowbar circuits；Together
When do not need Crowbar current sensors, hardware cost will not be increased, reduce hardware cost instead.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is that double-fed unit rotor electric current and Crowbar current estimating method evaluation of integrals of the present invention realizes block diagram；
Fig. 2 is the hardware circuit diagram of the objective for implementation Crowbar circuits of the method for the present invention.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In double-fed frequency converter operational process, it often will appear " damage of Crowbar circuits " when the shutdown of Crowbar circuits,
It has been investigated that being to cause IGBT to damage since Crowbar circuits turn off overvoltage, and turn off IGBT overvoltage and the pass at moment
Power-off stream is directly related, if cut-off current is excessive, causes shutdown voltage excessive.The present invention passes through double-fed generator rotor current
The suitable shutdown moment is selected instead of the effect of sensor with the estimation of Crowbar electric currents, reduces IGBT damages.The present invention can
Accurately to estimate double-fed unit rotor electric current and Crowbar electric currents, reference is provided for the shutdown moment of Crowbar, is reduced because closing
The IGBT damages that broken belt comes；And Crowbar current sensors are not needed, hardware cost will not be increased.
As shown in Figure 1, a kind of inhibiting the method that Crowbar circuits damage in double-fed fan motor unit, include the following steps：
(1) sensor acquisition stator voltage, stator current, encoder angular value；
(2) Crowbar current values are estimated according to the stator voltage of sensor acquisition, stator current, encoder angular value：
(3) determine that suitable Crowbar circuits turn off the moment according to Crowbar current values, when Crowbar current values are less than
It it is the shutdown moment of suitable Crowbar circuits when 700-900A.
Preferably, the evaluation method of Crowbar current values is as follows：
S1. the calculating of stator-induced electromagnetic kinetic potential：
Sensor acquires threephase stator voltage Usa, Usb, Usc, and threephase stator electric current Isa, Isb, Isc become by 3s/2s
It changes, obtains stator voltage Us α, the Us β under two-phase stationary coordinate system, stator current Is α, Is β；
E α=Us α+Rs*Is α (1-1)
E β=Us β+Rs*Is β (1-2)
Stator-induced electromagnetic kinetic potential E α, E β is calculated according to formula (1-1) and (1-2).Rs is double feedback electric engine stator electricity in formula
Resistance；
S2. low-pass filter calculates：
E α _ compensation=E α+Gama*E β (2-1)
E β _ compensation=E β-Gama*E α (2-2)
Stator-induced electromagnetic kinetic potential E α, E β are compensated according to formula (2-1) and (2-2), the stator-induced electromagnetic after compensation is dynamic
Gesture E α _ compensation, E β _ compensation, Gama is penalty coefficient in formula；
S3. stator magnetic linkage calculates:
According to formula (3-1) and (3-2), low-pass first order filter is passed through in E α _ compensation, E β _ compensation, and stator magnetic linkage is calculated
φsα、φsβ。For the transmission function of low-pass first order filter；
S4. the rotor current of conversion to stator side calculates:
Ir α _ s=(φ s α+Ls*Is α)/Lm (4-1)
Ir β _ s=(φ s β+Ls*Is β)/Lm (4-2)
According to formula (4-1) and (4-2), rotor current Ir α _ s, Ir β _ s that stator side is arrived in conversion is calculated, frequency is
Stator frequency 50Hz.Ls, Lm are respectively stator equivalent self inductance and equivalent mutual inductance in formula.
S5. rotor-sided rotor current calculates:
Ir α=- Vnom/Vo_r* [Ir α _ s*cos (θ r)+Ir β _ s*sin (θ r)] (5-1)
Ir β=- Vnom/Vo_r* [- Ir α _ s*sin (θ r)+Ir β _ s*cos (θ r)] (5-2)
According to formula (5-1) and (5-2), rotor current Ir α, the Ir β of rotor-side is calculated, Vnom is fixed for generator in formula
Sub- rated line voltage, Vo_r are generator amature open-circuit voltage, and θ r are that generator amature electrical angle=encoder angular is multiplied by electricity
Machine number of pole-pairs.
S6.Crowbar Current calculations:
Double fed electric machine rotor electric current Ir α, Ir β are converted by 2s/3s, obtain the rotor current under three-phase static coordinate system
Ira、Irb、Irc。
Crowbar electric currents can Approximate Equivalent be：
Icrowbar=Max (Abs (Ira), Abs (Irb), Abs (Irc)) (6-1)
Icrowbar is to estimate obtained Crowbar electric currents, and Max is to be maximized function in formula, and Abs is the letter that takes absolute value
Number.
Preferably, it is the pass of suitable Crowbar circuits when Crowbar current values are less than 700-800A in step (3)
The disconnected moment.
Preferably, in step (3), when Crowbar current values be less than 800A when for suitable Crowbar circuits shutdown when
It carves.
The present invention estimates rotor electricity by the collected stator voltage of sensor, stator current, encoder angular
Stream, and then obtain Crowbar electric currents, the suitable shutdown moment is selected, the damage of IGBT in Crowbar circuits is reduced.
The object of the method for the present invention is doubly fed machine group, and using IGBT type Crowbar circuits (attached drawing 2), according to above-mentioned step
Suddenly, it realizes the estimation of Crowbar electric currents, and then determines the Crowbar circuit suitable turn-off times.
The embodiments of the present invention have been described in detail above, but content is only the preferred embodiment of the present invention,
It should not be construed as limiting the practical range of the present invention.All changes and improvements made in accordance with the scope of the present invention, should all
It still belongs within this patent covering scope.
Claims (2)
1. a kind of inhibiting the method that Crowbar circuits damage in double-fed fan motor unit, it is characterised in that:Include the following steps：
(1) sensor acquisition stator voltage, stator current, encoder angular value；
(2) Crowbar current values are estimated according to the stator voltage of sensor acquisition, stator current, encoder angular value：
S1. the calculating of stator-induced electromagnetic kinetic potential：
Sensor acquires threephase stator voltage Usa, Usb, Usc, and threephase stator electric current Isa, Isb, Isc are converted by 3s/2s,
Stator voltage Us α, the Us β under two-phase stationary coordinate system are obtained,
Stator current Is α, Is β；
E α=Us α+Rs*Is α (1-1)
E β=Us β+Rs*Is β (1-2)
It is double feedback electric engine stator resistance that Rs in stator-induced electromagnetic kinetic potential E α, E β formulas, which is calculated, according to formula (1-1) and (1-2)；
S2. low-pass filter calculates：
E α _ compensation=E α+Gama*E β (2-1)
E β _ compensation=E β-Gama*E α (2-2)
Stator-induced electromagnetic kinetic potential E α, E β are compensated according to formula (2-1) and (2-2), the stator-induced electromagnetic kinetic potential E α after compensation _
It compensates, E β _ compensation, Gama is penalty coefficient in formula；
S3. stator magnetic linkage calculates:
According to formula (3-1) and (3-2), low-pass first order filter is passed through in E α _ compensation, E β _ compensation, and stator magnetic linkage φ s are calculated
α, φ s β,For the transmission function of low-pass first order filter；
S4. the rotor current of conversion to stator side calculates:
Ir α _ s=(φ s α+Ls*Is α)/Lm (4-1)
Ir β _ s=(φ s β+Ls*Is β)/Lm (4-2)
According to formula (4-1) and (4-2), conversion is calculated to rotor current Ir α _ s, the Ir β _ s of stator side, frequency is stator
Frequency 50Hz, Ls, Lm are respectively stator equivalent self inductance and equivalent mutual inductance in formula；
S5. rotor-sided rotor current calculates:
Ir α=- Vnom/Vo_r* [Ir α _ s*cos (θ r)+Ir β _ s*sin (θ r)] (5-1)
Ir β=- Vnom/Vo_r* [- Ir α _ s*sin (θ r)+Ir β _ s*cos (θ r)] (5-2)
According to formula (5-1) and (5-2), rotor current Ir α, the Ir β of rotor-side is calculated, Vnom is generator unit stator volume in formula
Line voltage, Vo_r are generator amature open-circuit voltage, and θ r are that generator amature electrical angle=encoder angular is multiplied by motor pole
Logarithm；
S6.Crowbar Current calculations:
Double fed electric machine rotor electric current Ir α, Ir β are converted by 2s/3s, obtain rotor current Ira under three-phase static coordinate system,
Irb, Irc,
Crowbar electric currents can Approximate Equivalent be：
Icrowbar=Max (Abs (Ira), Abs (Irb), Abs (Irc)) (6-1)
Icrowbar is to estimate obtained Crowbar electric currents, and Max is to be maximized function in formula, and Abs is the function that takes absolute value；
(3) determine that suitable Crowbar circuits turn off the moment according to Crowbar current values, when Crowbar current values are less than 900A
When for suitable Crowbar circuits the shutdown moment.
2. according to claim 1 inhibit the method that Crowbar circuits damage in double-fed fan motor unit, it is characterised in that：
It it is the shutdown moment of suitable Crowbar circuits when Crowbar current values are less than 800A in step (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437253.XA CN105071430B (en) | 2015-07-22 | 2015-07-22 | Inhibit the method that Crowbar circuits damage in double-fed fan motor unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510437253.XA CN105071430B (en) | 2015-07-22 | 2015-07-22 | Inhibit the method that Crowbar circuits damage in double-fed fan motor unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105071430A CN105071430A (en) | 2015-11-18 |
| CN105071430B true CN105071430B (en) | 2018-09-18 |
Family
ID=54500743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510437253.XA Active CN105071430B (en) | 2015-07-22 | 2015-07-22 | Inhibit the method that Crowbar circuits damage in double-fed fan motor unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105071430B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788016B (en) * | 2016-12-21 | 2019-02-19 | 天津瑞能电气有限公司 | A kind of judgment method of double feedback electric engine stator current distortion zone |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621204B (en) * | 2009-08-14 | 2011-05-11 | 清华大学 | Method for designing crowbar resistor for passing through low voltage of double-fed type wind generator system |
| JP5409197B2 (en) * | 2009-08-27 | 2014-02-05 | 株式会社日立製作所 | Secondary excitation type power generation system |
| CN102223126A (en) * | 2011-06-28 | 2011-10-19 | 北京清能华福风电技术有限公司 | Variable resistor Crowbar structures for low-voltage ride-through of wind power generation and method for realizing variable resistor Crowbar structures |
| CN103346718A (en) * | 2013-06-21 | 2013-10-09 | 东南大学 | Control method of birotor permanent magnet wind power generation system under voltage imbalance |
-
2015
- 2015-07-22 CN CN201510437253.XA patent/CN105071430B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105071430A (en) | 2015-11-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DK2096750T3 (en) | Sensorless rotor position estimation system for a wind turbine generator | |
| Chwa et al. | Variable structure control of the active and reactive powers for a DFIG in wind turbines | |
| CN105375532B (en) | A kind of fault phase-selecting method suitable for double-fed fan motor field interconnection | |
| WO2007001007A1 (en) | Power conversion control device, power conversion control method, and power conversion control program | |
| Abdelmadjid et al. | An improved stator winding fault tolerance architecture for vector control of induction motor: Theory and experiment | |
| US8451573B1 (en) | Overvoltage protection device for a wind turbine and method | |
| Wang et al. | A new control system to strengthen the LVRT capacity of DFIG based on both crowbar and DC chopper circuits | |
| CN105071430B (en) | Inhibit the method that Crowbar circuits damage in double-fed fan motor unit | |
| Okedu | Determination of the most effective switching signal and position of braking resistor in DFIG wind turbine under transient conditions | |
| Ivanqui et al. | “pq theory” control applied to wind turbine trapezoidal PMSG under symmetrical fault | |
| Zheng et al. | Full-order terminal sliding mode stator flux observer for DFIG | |
| Aghakashkooli et al. | A dual observer for parameter-free encoderless control of doubly-fed reluctance generators | |
| Zhu et al. | Direct torque control of three-phase PM brushless AC motor with one phase open-circuit fault | |
| EP3958457B1 (en) | Electric motor control device | |
| US10288040B2 (en) | Current limit calculation for wind turbine control | |
| Engelhardt et al. | Capability and limitations of DFIG based wind turbines concerning negative sequence control | |
| Jacomini et al. | Sensorless rotor position based on MRAS observer for doubly fed induction generator | |
| KR101174375B1 (en) | Generation System for Controlling Rotor Current of Generator and Method thereof | |
| CN104993514A (en) | Doubly-fed wind power generator rotor flux deadbeat control method under condition of power grid voltage drop | |
| Kadri et al. | DTC of doubly fed induction generator for wind power system based on rotor flux estimation | |
| SE et al. | Comparison Between Outer Crowbar and RSFCL for LVRT Capability Enhancement of Wind Turbines Conversion System | |
| Abbaszadeh et al. | Transient response of doubly fed induction generator under voltage sag using an accurate model | |
| Mondal et al. | Second Order Sliding Mode Observer Design for the Speed Estimation of DFIG | |
| Luna et al. | Control strategies for DFIG wind turbines under grid fault conditions | |
| Debbou et al. | Analytical redundancy for service continuity of Doubly Fed Induction Machine speed drive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230630 Address after: No. 100, Hangtian Road, Tianjin Pilot Free Trade Zone (Airport Economic Zone), Binhai, Tianjin 300450 Patentee after: TIANJIN RUIYUAN ELECTRICAL Co.,Ltd. Address before: No.1 Xinghua No.7 Branch Road, economic development zone, Xiqing District, Tianjin Patentee before: Tianjin Ruineng electric Co.,LTD. |