CN109921381A - A kind of double feedback electric engine Chopper protection act criterion method - Google Patents
A kind of double feedback electric engine Chopper protection act criterion method Download PDFInfo
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- CN109921381A CN109921381A CN201910248078.8A CN201910248078A CN109921381A CN 109921381 A CN109921381 A CN 109921381A CN 201910248078 A CN201910248078 A CN 201910248078A CN 109921381 A CN109921381 A CN 109921381A
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Abstract
The invention discloses a kind of double feedback electric engine Chopper protection act criterion methods; when short trouble occurs for double feedback electric engine; using the set end voltage after failure as Chopper protection act criterion; compared to original DC bus-bar voltage criterion method; criterion method disclosed by the invention can judge whether Chopper protection acts more conveniently; for the double feedback electric engine calculation of short-circuit current and correlative study after research Chopper investment, it is of great significance.
Description
Technical field
The present invention relates to wind power plant field safeties, and in particular to a kind of double feedback electric engine Chopper protection act criterion side
Method.
Background technique:
Most of double-fed fan motor unit both increases Chopper protection at present, and the low-voltage for improving double feedback electric engine is worn
More ability has ensured the safe and stable operation of wind power plant.Protection act criterion refers to after disturbance occurs, and judges that Chopper is protected
The foundation whether shield acts.After failure occurs, in order to avoid current transformer damage, DC bus-bar voltage is usually set and is greater than a certain number
Chopper protection investment when value, but researcher is difficult to judge whether Chopper protection acts from external data, therefore mesh
A kind of criterion of the preceding parameter for needing easy acquisition as double feedback electric engine Chopper protection act.
Summary of the invention
The purpose of the present invention is to provide a kind of double feedback electric engine Chopper protection act criterion methods, to solve existing skill
Caused above-mentioned defects in art.
A kind of double feedback electric engine Chopper protection act criterion method, specifically comprises the following steps:
Step 1, the transient characterisitics after doubly-fed wind turbine mathematical model and its failure are analyzed；
Step 2, it according to the doubly-fed wind turbine mathematical model and its transient characterisitics, derives Chopper protection and does not throw
Fashionable double fed electric machine rotor voltage expression；
Step 3, it enables rotor voltage be equal to DC bus-bar voltage and limits threshold value, obtain the set of set end voltage and time
{(Kdi,ti), take K in the setdMinimum value, as required set end voltage Drop coefficient limiting value；
Step 4, set end voltage limiting value after the failure of Chopper protection act can be obtained according to the coefficient, which is
For doubly-fed wind turbine Chopper protection act criterion disclosed by the invention,
The expression formula of rotor voltage are as follows:
Wherein t is time, t0Moment, R occurs for short troublerFor rotor resistance, ωp=ωs–ωrFor slip angular velocity,
ωrFor rotor velocity, ωsFor synchronous rotational speed, s=ωp/ωsFor revolutional slip,It is equivalent for rotor transient state
Inductance, LsFor stator winding equivalent inductance, LrFor rotor windings equivalent inductance, LmFor magnetizing inductance；
For dq synchronously rotating reference frame
Rotor current space vector under system,For rotor electricity
Flow reference value, Ps,refAnd Qs,refRespectively active power reference value and reactive power reference qref, KdFor double feedback electric engine set end voltage
Drop coefficient, ψsmFor stator magnetic linkage amplitude,For the decaying of rotor induction kinetic potential e DC component after failure
Time constant；For the DC component of rotor induction kinetic potential e after failure；us0For failure
Preceding set end voltage amplitude, μ=(Rr+kp+jωpL'r)/L'rWith λ=ki/L'rFor parametric variable, kpAnd kiRespectively rotor current
The proportionality coefficient and integration time constant of inner ring PI controller； For the characteristic root of certain ODE；For rotor current
Initial value,WithStator, the inductor rotor coefficient of coup are respectively represented,For stator magnetic linkage initial value,For rotor flux initial value.
It enables rotor voltage be equal to DC bus-bar voltage and limits threshold value, i.e.,
Take { (Kdi,ti) set in KdiMinimum value Kdmin, as required set end voltage Drop coefficient Kd。
Then the doubly-fed wind turbine Chopper protection act criterion disclosed by the invention are as follows:
us1=(1-Kd)us0
us1For set end voltage after failure, the as described doubly-fed wind turbine Chopper protection act criterion, if after failure
Virtual voltage is less than or equal to us1, then Chopper protection investment, does not put into conversely, Chopper is protected.
The present invention has the advantages that this kind of double feedback electric engine Chopper protection act criterion method, sends out with existing double-fed wind-force
The Chopper protection act criterion method of motor group is compared, and on the one hand the criterion belongs to external easily observation parameter, is easy to obtain；
On the other hand, the criterion is simple and clear, so that researcher extremely easily determines whether Chopper protection acts, to deeply opening
The analysis of the fault current of exhibition wind power plant is of great significance.
Detailed description of the invention
Fig. 1 is equivalent circuit diagram of the invention.
Fig. 2 is double feedback electric engine transient magnetic figure of the present invention.
Specific embodiment
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below with reference to
Specific embodiment, the present invention is further explained.
As depicted in figs. 1 and 2, a kind of double feedback electric engine Chopper protection act criterion method, comprising the following steps:
Step 1, it is assumed that work as t0Three phase short circuit fault has occurred in moment stator side, according to the double-fed under Space Rotating coordinate system
Wind-driven generator electro-magnetic transient equation, the transient characterisitics after analyzing its failure；
Classical voltage flux linkage equations are as follows:
Thus equation group can derive double fed electric machine rotor voltage expression when Chopper protection is not put into；
Step 2, it according to the doubly-fed wind turbine electro-magnetic transient equation under Space Rotating coordinate system, derives Chopper and protects
Double fed electric machine rotor voltage expression when shield is not put into:
Wherein t is time, t0Moment, R occurs for short troublerFor rotor resistance, ωp=ωs–ωrFor slip angular velocity,
ωrFor rotor velocity, ωsFor synchronous rotational speed, s=ωp/ωsFor revolutional slip,It is equivalent for rotor transient state
Inductance, LsFor stator winding equivalent inductance, LrFor rotor windings equivalent inductance, LmFor magnetizing inductance；
For dq synchronously rotating reference frame
Rotor current space vector under system, dq indicates coordinate system, d indicate that d-axis, q indicate quadrature axis (" Transient-State Analysis of Power System " Lee
The light fine jade third edition, p33-p45),
For rotor current reference value, Ps,refWith
Qs,refRespectively active power reference value and reactive power reference qref, KdFor double feedback electric engine set end voltage Drop coefficient, ψsmIt is fixed
Sub- magnetic linkage amplitude,For the damping time constant of rotor induction kinetic potential e DC component after failure；For the DC component of rotor induction kinetic potential e after failure；us0For set end voltage width before failure
Value, μ=(Rr+kp+jωpL'r)/L'rWith λ=ki/L'rFor parametric variable, kpAnd kiRespectively rotor current inner ring PI controller
Proportionality coefficient and integration time constant；For certain ordinary differential
The characteristic root of equation；ODE is
For rotor current initial value,WithStator, the inductor rotor coefficient of coup are respectively represented,For stator
Magnetic linkage initial value,For rotor flux initial value, RsFor stator impedance,For the equivalent transient inductance of stator, Is0For failure front stator electric current initial value.
Step 3, it enables rotor voltage be equal to DC bus-bar voltage and limits threshold value, i.e.,
Take { (Kdi,ti) set in KdiMinimum value Kdmin, as required set end voltage Drop coefficient Kd。
Step 4, set end voltage limiting value after the failure of Chopper protection act can be obtained according to the coefficient, which is
For doubly-fed wind turbine Chopper protection act criterion disclosed by the invention, i.e.,
us1=(1-Kd)us0
us1For set end voltage after failure, the as described doubly-fed wind turbine Chopper protection act criterion, if after failure
Virtual voltage is less than or equal to us1, then Chopper protection investment, does not put into conversely, Chopper is protected.
In research, the action situation of Chopper protection is obtained by this method, then carries out subsequent short circuit current meter
Calculation or correlative study.
Based on above-mentioned, when judging whether Chopper protection acts, using the set end voltage after failure as Chopper guarantor
Protect operating criterion, compared with the Chopper protection act criterion method of existing double-fed wind power generator group, one side new criterion category
In external easily observation parameter, it is easy to obtain；On the other hand, criterion disclosed by the invention is simple and clear, so that researcher is extremely
It easily determines whether Chopper protection acts, is of great significance to the analysis of the fault current for carrying out wind power plant in a deep going way.
As known by the technical knowledge, the present invention can pass through the embodiment party of other essence without departing from its spirit or essential feature
Case is realized.Therefore, embodiment disclosed above, in all respects are merely illustrative, not the only.Institute
Have within the scope of the present invention or is included in the invention in the change being equal in the scope of the present invention.
Claims (6)
1. a kind of double feedback electric engine Chopper protection act criterion method, which is characterized in that described method includes following steps:
Transient characterisitics after analyzing double feedback electric engine mathematical model and its failure；
Double fed electric machine rotor voltage expression when showing that Chopper protection is not put into according to mathematical model and transient characterisitics；
By rotor voltage expression formula, set end voltage Drop coefficient is calculated；
Set end voltage value, as double feedback electric engine after the failure of Chopper protection act are obtained according to set end voltage Drop coefficient
The criterion of Chopper protection act.
2. a kind of double feedback electric engine Chopper protection act criterion method according to claim 1, it is characterised in that: described
Rotor voltage expression formula are as follows:
Wherein t is time, t0The moment occurs for short trouble, j refers to the imaginary part part in complex field, RrFor rotor resistance, ωp=
ωs–ωrFor slip angular velocity, ωrFor rotor velocity, ωsFor synchronous rotational speed, s=ωp/ωsFor revolutional slip, Lr' it is rotor
Transient state equivalent inductance, irFor the rotor current space vector under dq synchronous rotating frame, dq indicates coordinate system, d indicates d-axis,
Q indicates quadrature axis, KdFor double feedback electric engine set end voltage Drop coefficient, e2For the DC component of rotor induction kinetic potential e after failure, us0
For set end voltage amplitude, k before failuresRepresent the stator inductance coefficient of coup.
3. a kind of double feedback electric engine Chopper protection act criterion method according to claim 2, it is characterised in that: described
L in rotor voltage expression formular' equivalent formulation are as follows:
Wherein, LsFor stator winding equivalent inductance, LrFor rotor windings equivalent inductance, LmFor magnetizing inductance.
4. a kind of double feedback electric engine Chopper protection act criterion method according to claim 3, it is characterised in that: described
I in rotor voltage expression formularCalculation formula are as follows:
Wherein,For rotor current reference value, Ps,refWith
Qs,refRespectively active power reference value and reactive power reference qref, KdFor double feedback electric engine set end voltage Drop coefficient, ψsmIt is fixed
Sub- magnetic linkage amplitude,For the damping time constant of rotor induction kinetic potential e DC component after failure,For the DC component of rotor induction kinetic potential e after failure, us0For generator terminal electricity before failure
Pressure amplitude value, μ=(Rr+kp+jωpL'r)/L'rWith λ=ki/L'rFor parametric variable, kpAnd kiRespectively rotor current inner ring PI control
The proportionality coefficient and integration time constant of device processed,For
The characteristic root of certain ODE,For rotor current initial value,WithPoint
Stator, the inductor rotor coefficient of coup are not represented,For stator magnetic linkage initial value,For rotor flux initial value, RsFor stator impedance,It is fixed
The equivalent transient inductance of son, Is0For failure front stator electric current initial value.
5. a kind of double feedback electric engine Chopper protection act criterion method according to claim 1, it is characterised in that: described
The calculation method of set end voltage Drop coefficient includes the following steps:
When rotor voltage amplitude, which is equal to DC bus-bar voltage, limits threshold value, set end voltage Drop coefficient and the time at this time is obtained
The set of t, i.e. { (Kdi,ti), formula are as follows:
Take { (Kdi,ti) set in KdiMinimum value Kdmin, as required set end voltage Drop coefficient Kd, Udc.thFor DC bus
Limiting voltage threshold value.
6. a kind of double feedback electric engine Chopper protection act criterion method according to claim 1, it is characterised in that: described
Double feedback electric engine Chopper protection act criterion method includes following formula:
us1=(1-Kd)us0 (3)
us1For set end voltage after failure, if virtual voltage is less than or equal to u after failures1, then Chopper protects investment, conversely,
Chopper protection is not put into.
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| CN201910248078.8A CN109921381B (en) | 2019-03-29 | 2019-03-29 | Chopper protection action criterion method for double-fed motor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102187567A (en) * | 2008-10-20 | 2011-09-14 | 伍德沃德肯彭有限公司 | Protection system of a doubly-fed induction machine |
| CN105259462A (en) * | 2015-11-06 | 2016-01-20 | 河海大学 | Three-phase short circuit current calculating method for double-fed motor |
| CN105356520A (en) * | 2015-11-24 | 2016-02-24 | 上海电力学院 | Control method for improving low voltage ride through capability of wind power plant |
| CN106777600A (en) * | 2016-12-02 | 2017-05-31 | 河海大学 | Consider the double feedback electric engine short-circuit current calculation method of Chopper protections |
| CN109444737A (en) * | 2018-09-11 | 2019-03-08 | 昆明理工大学 | It is a kind of meter and crow bar operating time of protection double-fed blower three short circuit current analytic method |
-
2019
- 2019-03-29 CN CN201910248078.8A patent/CN109921381B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102187567A (en) * | 2008-10-20 | 2011-09-14 | 伍德沃德肯彭有限公司 | Protection system of a doubly-fed induction machine |
| CN105259462A (en) * | 2015-11-06 | 2016-01-20 | 河海大学 | Three-phase short circuit current calculating method for double-fed motor |
| CN105356520A (en) * | 2015-11-24 | 2016-02-24 | 上海电力学院 | Control method for improving low voltage ride through capability of wind power plant |
| CN106777600A (en) * | 2016-12-02 | 2017-05-31 | 河海大学 | Consider the double feedback electric engine short-circuit current calculation method of Chopper protections |
| CN109444737A (en) * | 2018-09-11 | 2019-03-08 | 昆明理工大学 | It is a kind of meter and crow bar operating time of protection double-fed blower three short circuit current analytic method |
Non-Patent Citations (1)
| Title |
|---|
| 曹鹏飞: "综合Crowbar和Choppe保护的双馈风机低电压穿越仿真研究", 《华北电力技术》 * |
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