CN103701147B - Based on the double-fed unit fault ride-through method of rotor crosstalk resistance - Google Patents

Based on the double-fed unit fault ride-through method of rotor crosstalk resistance Download PDF

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CN103701147B
CN103701147B CN201310659194.1A CN201310659194A CN103701147B CN 103701147 B CN103701147 B CN 103701147B CN 201310659194 A CN201310659194 A CN 201310659194A CN 103701147 B CN103701147 B CN 103701147B
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CN103701147A (en
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蔡旭
凌禹
贾锋
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Shanghai Jiaotong University
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Abstract

The invention provides a kind of double-fed unit fault ride-through method based on rotor crosstalk resistance, the method utilizes the resistance circuit sealing in double fed electric machine rotor winding, the direct-current unloading circuit being incorporated to converter DC side bus and controls to strengthen double-fed unit low voltage ride-through capability based on the rotor-side convertor controls policy co-ordination that conventional vector control technology is improved.The method of the invention is without the need to blocking rotor-side converter; double feedback electric engine is not out of control; therefore its energy systems stabilisation rotating speed; the too fast increase of suppression system rotating speed between age at failure; support line voltage; adopt suitable improvement control strategy can reduce the starter motor meeting of hardware protection circuit, thus strengthen the mapping of double-fed fan motor unit low voltage crossing.

Description

Based on the double-fed unit fault ride-through method of rotor crosstalk resistance
Technical field
The present invention relates to wind-powered electricity generation protection field, particularly, relate to a kind of double-fed unit fault ride-through method based on rotor crosstalk resistance.
Background technology
In order to tackle energy crisis and ecological deterioration, what countries in the world were just positive promotes the development and utilization of regenerative resource.Wherein wind power generation has become the focus of scientific research personnel and commercial enterprise's concern.This is because wind energy is a kind of reliable, unlimited, reproducible supply of electric power source.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 brought, thus reduce the discharge of carbon dioxide.
But large-scale wind power access electrical network but brings larger challenge to operation of power networks.Want large-scale wind power integration operation of power networks, Wind turbines must possess low voltage ride-through capability.In fact, all there is the problem of low voltage crossing in all Wind turbines, but double-fed unit most challenge, this is because double-fed unit is more responsive to grid disturbance.
At present, comparatively ripe and the double-fed unit low voltage crossing technology of commercialization is so-called crow bar (Crowbar) resist technology.When grid voltage sags, due to can not suddenling change of stator magnetic flux, therefore the appearance of DC component makes to produce overcurrent in rotor windings, thus 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 uninterruptedly being incorporated into the power networks of unit.
If publication number is the Chinese invention patent of 102315651A, the patent provides the device and method that a kind of crowbar circuit and double-fed induction generator pass through electric network fault, when grid voltage mutation 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 when causing double-fed induction generator group current transformer busbar voltage to rise to the crowbar circuit conducting voltage threshold value being equal to or greater than setting, controller is cut out pusher side current transformer and is triggered the switching circuit conducting of crowbar circuit by the drive circuit of crowbar circuit, triggering mode is the conducting number increasing crow bar branch road from a crow bar branch road one by one, to double-fed induction generator rotor current drops to the crowbar circuit On current threshold value that is less than setting and double-fed induction generator group current transformer busbar voltage drops to the crowbar circuit conducting voltage threshold value being less than setting, when the rotor current of double-fed induction generator decays to the crowbar circuit cut-off current threshold value being equal to or less than setting and double-fed induction generator group current transformer busbar voltage decays to the crowbar circuit shutoff voltage threshold value being equal to or less than setting time, controller turns off the switching circuit of the crow bar branch road of crowbar circuit and uncapping machine side converter one by one by the drive circuit of crowbar circuit, for electrical network provides reactive power support rapidly, help power system restoration.
And for example publication number is the Chinese invention patent of 103178548A, the patent provides a kind of symmetrical fault ride-through control of double-fed wind power generator group, the method is under the electric network fault of double-fed wind power generator group, when the electric current flowing into rotor converter exceedes its maximum permissible current value, the rotor Crowbar circuit of described double-fed wind power generator group puts into operation, rotor converter described in locking simultaneously; Between the fault emergence period, when described rotor Crowbar circuit drops into after τ r duration and rotor current is less than Crowbar protection act threshold value, described rotor Crowbar circuit is cut, restarts described rotor converter simultaneously; After failure removal, described rotor converter by recovering controlling tactic switch to active power mode of operation, and stops to electrical network injecting reactive current.Utilize the method can overcome the defect existed in existing fault traversing control strategy, thus improve the fault ride-through capacity of double-fed wind power generator group.
But 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 is in runaway condition, runs under asynchronous machine state;
2) under above-mentioned service conditions, generating unit speed stability worsens, and absorbs idle in a large number to electrical network, is unfavorable for the fault traversing of unit;
3) for doubly fed machine induction unit, crow bar protects this province to be also a kind of disturbance, the chance avoiding it to start of should taking measures.
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 ride-through method based on rotor crosstalk resistance; the method is without the need to blocking rotor-side converter; double feedback electric engine is not out of control; therefore its energy systems stabilisation rotating speed, suppresses the too fast increase of system rotating speed between age at failure, supports line voltage; adopt suitable control strategy to reduce the starter motor meeting of hardware protection circuit, thus 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 ride-through method based on rotor crosstalk resistance, the method utilizes the resistance circuit sealing in double fed electric machine rotor winding, the direct-current unloading circuit being incorporated to converter DC side bus and controls to strengthen double-fed unit low voltage ride-through capability based on the rotor-side convertor controls policy co-ordination that conventional vector control technology is improved, and step comprises:
First, double feedback electric engine stator voltage is detected in real time to calculate the described item based on embodying stator transient in front feedback voltage compensation item in the rotor-side convertor controls strategy of conventional vector control technology improvement;
Simultaneously in real time detection rotor electric current, produces switching over signal together with rotor reference electric current, seals in the input of the resistance circuit of double fed electric machine rotor winding and out of service described in realization;
Detect converter DC side busbar voltage in real time simultaneously, produce switching signal together with reference value, be incorporated to the input of the direct-current unloading circuit of converter DC side bus described in realization and exit.
Preferably, the described rotor-side convertor controls strategy improved based on conventional vector control technology is on the basis that conventional vector controls, and in front feedback voltage compensation item, add the item of reflection stator voltage transient performance, the expression formula of its dq component is respectively:
Δu dr = L m L s u ds
Δu qr = L m L s ( s - 1 ) ω 1 p u ds
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 sealing 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 relationship has three groups, seals in three-phase rotor windings respectively, and its one end connects with double fed electric machine rotor winding, the other end is connected with rotor-side converter AC.
Preferably, the described direct-current unloading circuit being 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 positive pole, another termination electric power generation unloading resistance, 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 gets 2 times to 1.2 times of its rated value as its higher limit and lower limit, to ensure that rotor current is unlikely to destroy converter for foundation.
Compared with prior art, the present invention has following beneficial effect:
The measure that the present invention utilizes rotor-side crosstalk to hinder, the motor solving traditional crow bar protection existence is out of control, absorbs idle problem; The rotor-side convertor controls strategy improved is utilized to reduce the starter motor meeting of hardware protection.The present invention is without the need to 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, thus supports voltage resume.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the resistance circuit schematic diagram sealing in double fed electric machine rotor winding of the present embodiment;
Fig. 2 is the direct-current unloading circuit schematic diagram being incorporated to converter DC side bus of the present embodiment;
Fig. 3 is the rotor-side convertor controls strategy schematic diagram improved based on conventional vector control technology of the present embodiment;
Rotor current oscillogram when Fig. 4 is the different voltage failure of the present embodiment; Wherein (a) is rotor current when voltage falls 30%, and (b) is rotor current when voltage falls 70%, and (c) is rotor current when voltage falls 80%;
DC side busbar voltage figure when Fig. 5 is the different voltage failure of the present embodiment; Wherein (a) is direct voltage when voltage falls 30%, and (b) is direct voltage when voltage falls 70%, and (c) is direct voltage when voltage falls 80%;
Stator idle figure when Fig. 6 is the different voltage failure of the present embodiment; Wherein (a) for stator when voltage falls 30% idle, (b) for stator when voltage falls 70% idle, (c) for stator when voltage falls 80% idle;
Fig. 7 is the voltage of the present embodiment unit speed diagram when 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 and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
The present embodiment provides a kind of double-fed unit fault ride-through method based on rotor crosstalk resistance, and the environment of its embody rule is based on simulation software PSCAD/EMTDC; The doubly fed induction generator parameter used 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 30%, 70% and 80% 3 kind of situation respectively; Occur during fault 8s, the duration is 625ms.The converter of double-fed unit is made up of two parts usually, i.e. rotor-side converter and grid side converter, and the two is referred to as converter.
The present embodiment method utilizes the resistance circuit sealing in double fed electric machine rotor winding, the direct-current unloading circuit being incorporated to converter DC side bus and controls to strengthen double-fed unit low voltage ride-through capability based on the rotor-side convertor controls policy co-ordination that conventional vector control technology is improved, wherein:
As shown in Figure 1, the resistance circuit sealing 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 parallel relationship has three groups, seal in three-phase rotor windings respectively, its one end connects 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 being incorporated to converter DC side bus described in comprises: one and diode D 1the one termination converter DC side bus positive pole of antiparallel IGBT, another termination electric power generation unloading resistance R 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, the described rotor-side convertor controls strategy improved based on conventional vector control technology is on the basis that conventional vector controls, and in front feedback voltage compensation item, add the item of reflection stator voltage transient performance, the expression formula of its dq component is respectively:
Δu dr = L m L s u ds
Δu qr = L m L s ( s - 1 ) ω 1 p u ds - - - ( 1 )
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 the rotor-side convertor controls policy co-ordination that described realization improves based on conventional vector control technology controls is:
First in real time detect stator voltage, calculate the dq component under synchronous coordinate system, substitute into formula (1), calculate the dynamic item of reflection stator voltage, participate in the control of rotor current.
Simultaneously, real-time detection rotor electric current, then compares with reference value, if it is greater than reference value, the resistance circuit logic control signal sealing in double fed electric machine rotor winding exports as low level, and the resistance sealing in the resistance circuit of double fed electric machine rotor winding seals in rotor windings; Otherwise the resistance circuit logic control signal sealing in double fed electric machine rotor winding exports as high level, and by-pass switch closes, and the resistance sealing in the resistance circuit of double fed electric machine rotor winding is bypassed.
Meanwhile, detect converter DC side busbar voltage in real time, deduct reference value, by Hysteresis control, if difference is greater than bandwidth higher limit, export high level, start the direct-current unloading circuit being 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, owing to being carry out in PSCAD/EMTDC software, draw in the model that stator voltage directly uses this software to carry.
In the present embodiment, owing to being carry out in PSCAD/EMTDC software, draw in the model that rotor current directly uses this software to carry.
In the present embodiment, owing to being carry out in PSCAD/EMTDC software, draw in the model that DC side busbar voltage directly uses this software to carry.
In the present embodiment, it is foundation that the setting of reference value will ensure that rotor current is unlikely to destroy converter, usually gets 2 times to 1.2 times of its rated value as its higher limit and lower limit.
The result of implementation of the present embodiment or effect 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 decreases the starter motor meeting of the resistance circuit protection sealing in double fed electric machine rotor winding;
DC side busbar voltage figure when Fig. 5 is different voltage failure, can find out, the direct-current unloading circuit being incorporated to converter DC side bus well can maintain it and stablize;
Stator idle figure when Fig. 6 is different voltage failure, can find out not idle to Systemic absorption;
Fig. 7 is voltage unit speed diagram when falling 80%, and can find out, even if (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 ride-through method based on rotor crosstalk resistance of the present invention can systems stabilisation stabilization of speed; anti-locking system rotating speed trip protection, does not absorb idle to electrical network between age at failure, can strengthening system low voltage ride-through capability.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (6)

1. the double-fed unit fault ride-through method based on rotor crosstalk resistance, it is characterized in that, the method utilizes the resistance circuit sealing in double fed electric machine rotor winding, the direct-current unloading circuit being incorporated to converter DC side bus and controls to strengthen double-fed unit low voltage ride-through capability based on the rotor-side convertor controls policy co-ordination that conventional vector control technology is improved, and step comprises:
First, double feedback electric engine stator voltage is detected in real time to calculate the described item based on embodying stator transient in the front feedback voltage compensation item in the rotor-side convertor controls strategy of conventional vector control technology improvement;
Simultaneously in real time detection rotor electric current, produces switching over signal together with rotor reference electric current, seals in the input of the resistance circuit of double fed electric machine rotor winding and out of service described in realization;
Detect converter DC side busbar voltage in real time simultaneously, produce switching over signal together with reference voltage, be incorporated to the input of the direct-current unloading circuit of converter DC side bus described in realization and exit;
The described rotor-side convertor controls strategy improved based on conventional vector control technology is on the basis that conventional vector controls, and in front feedback voltage compensation item, add the item of reflection stator voltage transient performance, the expression formula of its dq component is respectively:
Δu d r = L m L s u d s
Δu q r = L m L s ( s - 1 ) ω 1 p u d s
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.
2. a kind of double-fed unit fault ride-through method based on rotor crosstalk resistance according to claim 1, 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 relationship has three groups, seals in three-phase rotor windings respectively, and its one end connects with double fed electric machine rotor winding, the other end is connected with rotor-side converter AC.
3. a kind of double-fed unit fault ride-through method based on rotor crosstalk resistance according to claim 2, it is characterized in that, the real-time detection rotor electric current of described method, then compare with reference current, if it is greater than reference current, described resistance circuit logic control signal exports as low level, and the resistance sealing in the resistance circuit of double fed electric machine rotor winding seals in rotor windings; Otherwise described resistance circuit logic control signal exports as high level, and by-pass switch closes, and the resistance sealing in the resistance circuit of double fed electric machine rotor winding is bypassed.
4. a kind of double-fed unit fault ride-through method based on rotor crosstalk resistance according to claim 1 and 2, it is characterized in that, the described direct-current unloading circuit being incorporated to converter DC side bus comprises: one and the antiparallel IGBT of the first diode, the collector electrode of IGBT connects converter DC side bus positive pole, the emitter of IGBT connects an electric power generation unloading resistance, connect converter DC side bus negative pole after this electric power generation unloading resistance second diode in parallel, the base stage of IGBT connects the switching over signal of its control system output by drive circuit.
5. a kind of double-fed unit fault ride-through method based on rotor crosstalk resistance according to claim 4, it is characterized in that, described method detects converter DC side busbar voltage in real time, deduct reference voltage, pass through Hysteresis control, if difference is greater than bandwidth higher limit, export high level, start the direct-current unloading circuit being 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.
6. a kind of double-fed unit fault ride-through method based on rotor crosstalk resistance according to claim 1 and 2, it is characterized in that, the setting of described reference current gets 2 times of rotor current rated value and 1.2 times respectively as reference current higher limit and lower limit, to ensure that rotor current is unlikely to destroy converter for foundation.
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CN106410844B (en) * 2016-10-13 2019-05-31 浙江运达风电股份有限公司 A kind of improved double fed induction generators low voltage traversing 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
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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