CN103701147A - Double-fed unit fault ride-through method based on rotor series resistance - Google Patents
Double-fed unit fault ride-through method based on rotor series resistance Download PDFInfo
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- CN103701147A CN103701147A CN201310659194.1A CN201310659194A CN103701147A CN 103701147 A CN103701147 A CN 103701147A CN 201310659194 A CN201310659194 A CN 201310659194A CN 103701147 A CN103701147 A CN 103701147A
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Abstract
The invention provides a double-fed unit fault ride-through method based on rotor series resistance. The method comprises the following step: enhancing the low voltage ride-through capability of a double-fed unit through coordination control of a resistance circuit connected in series to a rotor winding of the double-fed unit, a DC unloading circuit connected in parallel to the DC side bus of a converter, and the control strategy of a rotor side converter improved on the basis of a traditional vector control technology. According to the invention, the rotor side converter is not required to be blocked, and a double-fed motor is not out of control, therefore, the rotating speed of a system can be stabilized, the fast increasing of the rotating speed of the system in the failure period is inhibited, the network voltage is supported, and the starting opportunity of a hardware protection circuit can be reduced by adopting the proper improved control strategy, thereof, the low voltage ride-through transient performance of a double-fed wind turbine generator is enhanced.
Description
Technical field
The present invention relates to wind-powered electricity generation protection field, particularly, relate to a kind of double-fed unit fault traversing method based on rotor crosstalk resistance.
Background technology
In order to tackle energy crisis and ecological deterioration, the development and utilization that is promoting regenerative resource that countries in the world are just positive.Wherein wind power generation has become the focus of scientific research personnel and commercial enterprise's concern.This is a kind of reliable, unlimited, reproducible supply of electric power source because of wind energy.The large-scale application of wind-powered electricity generation both can alleviating energy crisis, can alleviate again conventional energy resource and use the environmental problem of bringing, thereby reduce the discharge of carbon dioxide.
Yet large-scale wind power access electrical network has but brought larger challenge to operation of power networks.Want large-scale wind-powered electricity generation access operation of power networks, wind-powered electricity generation unit must possess low voltage ride-through capability.In fact, all there is the problem of low voltage crossing in all wind-powered electricity generation units, but the tool challenge of double-fed unit, this is because double-fed unit is more responsive to grid disturbance.
At present, comparatively ripe and commercial double-fed unit low voltage crossing technology is so-called crow bar (Crowbar) resist technology.When line voltage falls, due to can not suddenling change of stator magnetic flux, so the appearance of DC component makes to produce overcurrent in rotor winding, thereby causes the destruction of converter.And so-called crow bar resist technology is exactly for rotor fault electric current provides bypass path, thus avoid rotor overcurrent to the destruction of converter to realize being uninterruptedly incorporated into the power networks of unit.
As the Chinese invention patent that publication number is 102315651A, this patent provides a kind of crowbar circuit and double-fed induction generator to pass through the device and method of electric network fault, when line voltage sudden change causes double-fed induction generator rotor current to rise to being equal to or greater than the crowbar circuit On current threshold value of setting or while causing double-fed induction generator group current transformer busbar voltage to rise to the crowbar circuit conducting voltage threshold value that is equal to or greater than setting, controller cuts out pusher side current transformer and by the drive circuit of crowbar circuit, triggers the switching circuit conducting of crowbar circuit, triggering mode is for increasing one by one the conducting number of crow bar branch road since a crow bar branch road, till dropping to and be less than the crowbar circuit On current threshold value of setting and double-fed induction generator group current transformer busbar voltage and drop to the crowbar circuit conducting voltage threshold value that is less than setting to double-fed induction generator rotor current, when the rotor current of double-fed induction generator decays to the crowbar circuit cut-off current threshold value that is equal to or less than setting and when double-fed induction generator group current transformer busbar voltage decays to the crowbar circuit shutoff voltage threshold value that is equal to or less than setting, controller turn-offs switching circuit the uncapping machine side converter of the crow bar branch road of crowbar circuit one by one by the drive circuit of crowbar circuit, for electrical network provides rapidly reactive power support, help power system restoration.
The Chinese invention patent that and for example publication number is 103178548A, this patent provides a kind of symmetric fault traversing control method of double-fed wind power generator group, the method is under the electric network fault of double-fed wind power generator group, when flowing into the electric current of rotor converter over its maximum permissible current value, the rotor Crowbar circuit of described double-fed wind power generator group puts into operation, simultaneously rotor converter described in locking; In fault between the emergence period, after described rotor Crowbar circuit drops into τ r duration and when rotor current value is less than Crowbar protection action threshold value, described rotor Crowbar circuit is cut, restarts described rotor converter simultaneously; After failure removal, described rotor converter is switched to active power mode of operation by recovering control strategy, and stops to electrical network injecting reactive current.Utilize the method can overcome the defect existing in existing fault traversing control strategy, thereby improve the fault ride-through capacity of double-fed wind power generator group.
Yet but there is following shortcoming in above-mentioned patent crow bar resist technology:
1) after crow bar drops into, doubly fed induction generator machine-side converter blocks, and motor, in runaway condition, runs under asynchronous machine state;
2) under above-mentioned service conditions, generating unit speed stability worsens, and idle in a large number to electrical network absorption, is unfavorable for the fault traversing of unit;
3) for doubly fed machine induction unit, it is also a kind of disturbance that crow bar is protected this province, should take measures to avoid the chance of its startup.
Summary of the invention
For defect of the prior art; the object of this invention is to provide a kind of double-fed unit fault traversing method based on rotor crosstalk resistance; the method is without blocking rotor-side converter; double feedback electric engine is not out of control; so its energy systems stabilisation rotating speed, the too fast increase of inhibition system rotating speed between age at failure, supports line voltage; adopt suitable control strategy to reduce the starter motor meeting of hardware protection circuit, thereby strengthen the mapping of double-fed fan motor unit low voltage crossing.
For realizing above object, the invention provides a kind of double-fed unit fault traversing method based on rotor crosstalk resistance, the method utilization seal in double fed electric machine rotor winding resistance circuit, be incorporated to the direct-current unloading circuit of converter DC side bus and control to strengthen double-fed unit low voltage ride-through capability based on the improved rotor-side convertor controls of conventional vector control technology policy co-ordination, step comprises:
First, detect in real time double feedback electric engine stator voltage to calculate the item that embodies stator transient state in the described middle front feedback voltage compensation item based on the improved rotor-side convertor controls of conventional vector control technology strategy;
Simultaneously in real time detection rotor electric current produces switching over signal together with rotor reference current, seals in the input of resistance circuit of double fed electric machine rotor winding and out of service described in realization;
Detect converter DC side busbar voltage simultaneously in real time, produce switching signal together with reference value, be incorporated to described in realization converter DC side bus direct-current unloading circuit input and exit.
Preferably, described is on the basis of controlling in conventional vector based on the improved rotor-side convertor controls of conventional vector control technology strategy, has increased the item of reflection stator voltage transient performance in front feedback voltage compensation item, and the expression formula of its dq component is respectively:
In formula: L
m, L
sbe respectively mutual inductance and stator inductance;
U
dsfor stator voltage d axle component;
S is slippage;
ω
1for synchronous angular velocity;
P is differential operator.
Preferably, the resistance circuit that seals in double fed electric machine rotor winding described in comprises: a resistance and the bidirectional thyristor that serve as by-pass switch in parallel with it; The resistance circuit of this parallel connection relation has three groups, seals in respectively three-phase rotor winding, and its one end joins with double fed electric machine rotor winding, the other end is connected with rotor-side converter AC.
Preferably, the described direct-current unloading circuit that is incorporated to converter DC side bus comprises: one and the antiparallel IGBT(insulated gate bipolar transistor of the first diode) a termination converter DC side bus anodal, electric power generation unloading resistance of another termination, connects converter DC side bus negative pole after this electric power generation unloading resistance second diode in parallel.
Preferably, the setting of described reference value is got 2 times to 1.2 times of its rated value as its higher limit and lower limit, take and guarantees that rotor current is unlikely to destroy converter as foundation.
Compared with prior art, the present invention has following beneficial effect:
The present invention utilizes the measure of rotor-side crosstalk resistance, and the motor that solves traditional crow bar protection existence is out of control, absorbs idle problem; Utilize improved rotor-side convertor controls strategy to reduce the starter motor meeting of hardware protection.The present invention is without blocking rotor-side converter, and motor is not out of control, can systems stabilisation speed stability, and restriction system rotating speed increases, and prevents from absorbing between unit age at failure idle, thereby support voltage, recovers.
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is the resistance circuit schematic diagram that seals in double fed electric machine rotor winding of the present embodiment;
Fig. 2 is the direct-current unloading circuit schematic diagram that is incorporated to converter DC side bus of the present embodiment;
Fig. 3 be the present embodiment based on the improved rotor-side convertor controls of conventional vector control technology strategy schematic diagram;
Rotor current oscillogram when Fig. 4 is the different voltage failure of the present embodiment; Rotor current when wherein (a) falls 30% for voltage, rotor current while (b) falling 70% for voltage, rotor current while (c) falling 80% for voltage;
DC side busbar voltage figure when Fig. 5 is the different voltage failure of the present embodiment; Direct voltage when wherein (a) falls 30% for voltage, direct voltage while (b) falling 70% for voltage, direct voltage while (c) falling 80% for voltage;
The idle figure of stator when Fig. 6 is the different voltage failure of the present embodiment; When wherein (a) falls 30% for voltage, stator is idle, and while (b) falling 70% for voltage, stator is idle, and while (c) falling 80% for voltage, stator is idle;
Fig. 7 is the voltage of the present embodiment unit speed diagram while falling 80%.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
The present embodiment provides a kind of double-fed unit fault traversing method based on rotor crosstalk resistance, and the environment of its concrete application is based on the PSCAD/EMTDC of simulation software; The doubly fed induction generator parameter of using in emulation is: rated power P
n=2MW, rated voltage U
n=690V, rated frequency f=50Hz, stator resistance R
s=0.00488pu, stator leakage inductance L
ls=0.1386pu, rotor resistance R
r=0.00549pu, rotor leakage inductance L
lr=0.1493pu, mutual inductance L
m=3.9527pu, inertia time constant H=3.5s; Simulated conditions is: wind speed is 13.5m/s; Voltage falls respectively 30%, 70% and 80% 3 kind of situation; During fault 8s, occur, the duration is 625ms.The converter of double-fed unit is comprised of two parts conventionally, i.e. rotor-side converter and grid side converter, and the two is referred to as converter.
The utilization of the present embodiment method seal in double fed electric machine rotor winding resistance circuit, be incorporated to the direct-current unloading circuit of converter DC side bus and control to strengthen double-fed unit low voltage ride-through capability based on the improved rotor-side convertor controls of conventional vector control technology policy co-ordination, wherein:
As shown in Figure 1, the resistance circuit that seals in double fed electric machine rotor winding described in comprises: a resistance R
scband the bidirectional thyristor S that serve as by-pass switch in parallel with it, the circuit of this relation in parallel has three groups, seal in respectively three-phase rotor winding, its one end joins with double fed electric machine rotor winding, the other end is connected with rotor-side converter AC, for suppressing rotor fault electric current.
As shown in Figure 2, the direct-current unloading circuit that is incorporated to converter DC side bus described in comprises: one and diode D
1a termination converter DC side bus of antiparallel IGBT is anodal, electric power generation unloading resistance R of another termination
b, electric power generation unloading resistance R
ba diode D in parallel
2after connect converter DC side bus negative pole, for suppressing converter DC side busbar voltage overvoltage.
As shown in Figure 3, described is on the basis of controlling in conventional vector based on the improved rotor-side convertor controls of conventional vector control technology strategy, has increased the item of reflection stator voltage transient performance in front feedback voltage compensation item, and the expression formula of its dq component is respectively:
In formula: L
m, L
sbe respectively mutual inductance and stator inductance;
U
dsfor stator voltage d axle component;
S is slippage;
ω
1for synchronous angular velocity;
P is differential operator.
In the present embodiment, the detailed process that described realization is controlled based on the improved rotor-side convertor controls of conventional vector control technology policy co-ordination is:
First in real time detect stator voltage, calculate the dq component under synchronous coordinate system, substitution formula (1), calculates dynamic of reflection stator voltage, participates in the control of rotor current.
Simultaneously, real-time detection rotor electric current, then with reference value comparison, if it is greater than reference value, the resistance circuit logic control signal that seals in double fed electric machine rotor winding is output as low level, and the resistance that seals in the resistance circuit of double fed electric machine rotor winding seals in rotor winding; Otherwise the resistance circuit logic control signal that seals in double fed electric machine rotor winding is output as high level, by-pass switch is closed, and the resistance that seals in the resistance circuit of double fed electric machine rotor winding is bypassed.
Meanwhile, detect in real time converter DC side busbar voltage, deduct reference value, by stagnant ring, control, if difference is greater than bandwidth higher limit, output high level, starts the direct-current unloading circuit that is incorporated to converter DC side bus; If difference is less than lower band value, output low level, excision is incorporated to the direct-current unloading circuit of converter DC side bus; If difference is in bandwidth, output maintains the original state.
In the present embodiment, because be carries out in PSCAD/EMTDC software, in the model that stator voltage is directly used this software to carry, draw.
In the present embodiment, because be carries out in PSCAD/EMTDC software, in the model that rotor current is directly used this software to carry, draw.
In the present embodiment, because be carries out in PSCAD/EMTDC software, in the model that DC side busbar voltage is directly used this software to carry, draw.
In the present embodiment, the setting of reference value will guarantee that it is foundation that rotor current is unlikely to destroy converter, gets 2 times to 1.2 times of its rated value conventionally as its higher limit and lower limit.
The result of implementation of the present embodiment or effect are as shown in Fig. 4, Fig. 5, Fig. 6, Fig. 7, wherein:
Rotor current oscillogram when Fig. 4 is different voltage failure, finds out from waveform, rotor fault current peak is suppressed in prescribed limit, and has reduced the starter motor meeting of the resistance circuit protection that seals in double fed electric machine rotor winding;
When Fig. 5 is different voltage failure, DC side busbar voltage figure, can find out, the direct-current unloading circuit that is incorporated to converter DC side bus can well maintain it and stablize;
The idle figure of stator when Fig. 6 is different voltage failure, can not find out and absorb idle to system;
Fig. 7 is voltage unit speed diagram while falling 80%, can find out, even (fall 80%) under the most serious voltage failure, generating unit speed is overrate not yet.
The present embodiment is through simulating, verifying; double-fed unit fault traversing method based on rotor crosstalk resistance of the present invention can systems stabilisation stabilization of speed; anti-locking system rotating speed trip protection, idle to electrical network absorption between age at failure, can strengthening system low voltage ride-through capability.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (7)
1. the double-fed unit fault traversing method based on rotor crosstalk resistance, it is characterized in that, the method utilization seal in double fed electric machine rotor winding resistance circuit, be incorporated to the direct-current unloading circuit of converter DC side bus and control to strengthen double-fed unit low voltage ride-through capability based on the improved rotor-side convertor controls of conventional vector control technology policy co-ordination, step comprises:
First, detect in real time double feedback electric engine stator voltage to calculate the item that embodies stator transient state in the described front feedback voltage compensation item based in the improved rotor-side convertor controls of conventional vector control technology strategy;
Simultaneously in real time detection rotor electric current produces switching over signal together with rotor reference current, seals in the input of resistance circuit of double fed electric machine rotor winding and out of service described in realization;
Detect converter DC side busbar voltage simultaneously in real time, produce switching signal together with reference value, be incorporated to described in realization converter DC side bus direct-current unloading circuit input and exit.
2. a kind of double-fed unit fault traversing method based on rotor crosstalk resistance according to claim 1, it is characterized in that, described is on the basis of controlling in conventional vector based on the improved rotor-side convertor controls of conventional vector control technology strategy, the item that has increased reflection stator voltage transient performance in front feedback voltage compensation item, the expression formula of its dq component is respectively:
In formula: L
m, L
sbe respectively mutual inductance and stator inductance;
U
dsfor stator voltage d axle component;
S is slippage;
ω
1for synchronous angular velocity;
P is differential operator.
3. a kind of double-fed unit fault traversing method based on rotor crosstalk resistance according to claim 1 and 2, it is characterized in that, described in seal in double fed electric machine rotor winding resistance circuit comprise: a resistance and the bidirectional thyristor that serve as by-pass switch in parallel with it; The resistance circuit of this parallel connection relation has three groups, seals in respectively three-phase rotor winding, and its one end joins with double fed electric machine rotor winding, the other end is connected with rotor-side converter AC.
4. a kind of double-fed unit fault traversing method based on rotor crosstalk resistance according to claim 3, it is characterized in that, the real-time detection rotor electric current of described method, then with reference value comparison, if it is greater than reference value, described resistance circuit logic control signal is output as low level, and the resistance that seals in the resistance circuit of double fed electric machine rotor winding seals in rotor winding; Otherwise described resistance circuit logic control signal is output as high level, by-pass switch is closed, and the resistance that seals in the resistance circuit of double fed electric machine rotor winding is bypassed.
5. a kind of double-fed unit fault traversing method based on rotor crosstalk resistance according to claim 1 and 2, it is characterized in that, the described direct-current unloading circuit that is incorporated to converter DC side bus comprises: one and the antiparallel IGBT of the first diode are that a termination converter DC side bus of insulated gate bipolar transistor is anodal, electric power generation unloading resistance of another termination, connects converter DC side bus negative pole after this electric power generation unloading resistance second diode in parallel.
6. a kind of double-fed unit fault traversing method based on rotor crosstalk resistance according to claim 5, it is characterized in that, described method detects converter DC side busbar voltage in real time, deduct reference value, by stagnant ring, control, if difference is greater than bandwidth higher limit, output high level, starts the direct-current unloading circuit that is incorporated to converter DC side bus; If difference is less than lower band value, output low level, excision is incorporated to the direct-current unloading circuit of converter DC side bus; If difference is in bandwidth, output maintains the original state.
7. a kind of double-fed unit fault traversing method based on rotor crosstalk resistance according to claim 1 and 2, it is characterized in that, the setting of described reference value is got 2 times to 1.2 times of its rated value as its higher limit and lower limit, take and guarantees that rotor current is unlikely to destroy converter as foundation.
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Cited By (6)
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| CN105356501A (en) * | 2015-10-26 | 2016-02-24 | 山西大同大学 | Novel doubly-fed wind power generator set fault ride-through protection circuit |
| CN105552950A (en) * | 2015-12-01 | 2016-05-04 | 山西大同大学 | Doubly-fed wind turbine generator hybrid fault ride-through method |
| CN106410844A (en) * | 2016-10-13 | 2017-02-15 | 浙江运达风电股份有限公司 | Improved double-fed induction generator low voltage traverse control method |
| CN107112920A (en) * | 2014-09-22 | 2017-08-29 | 乌本产权有限公司 | Method for producing alternating current |
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
| CN112003321A (en) * | 2020-08-11 | 2020-11-27 | 宝鸡文理学院 | Low-voltage ride through control method for dynamic resistor of double-feeder rotor string |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107112920A (en) * | 2014-09-22 | 2017-08-29 | 乌本产权有限公司 | Method for producing alternating current |
| CN107112920B (en) * | 2014-09-22 | 2019-06-14 | 乌本产权有限公司 | Method for generating alternating current |
| CN105356501A (en) * | 2015-10-26 | 2016-02-24 | 山西大同大学 | Novel doubly-fed wind power generator set fault ride-through protection circuit |
| CN105356501B (en) * | 2015-10-26 | 2018-07-10 | 山西大同大学 | A kind of novel double-fed fan motor unit fault traversing protection circuit |
| CN105552950A (en) * | 2015-12-01 | 2016-05-04 | 山西大同大学 | Doubly-fed wind turbine generator hybrid fault ride-through method |
| CN106410844A (en) * | 2016-10-13 | 2017-02-15 | 浙江运达风电股份有限公司 | Improved double-fed induction generator low voltage traverse control method |
| CN109066629A (en) * | 2018-09-14 | 2018-12-21 | 珠海格力电器股份有限公司 | Electric motor protective device and air-conditioning |
| CN112003321A (en) * | 2020-08-11 | 2020-11-27 | 宝鸡文理学院 | Low-voltage ride through control method for dynamic resistor of double-feeder rotor string |
| CN112003321B (en) * | 2020-08-11 | 2022-05-17 | 宝鸡文理学院 | Low-voltage ride through control method for dynamic resistor of double-feeder rotor string |
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