CN105207174A - Parameter setting method for wind turbine set circuit breaker - Google Patents
Parameter setting method for wind turbine set circuit breaker Download PDFInfo
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- CN105207174A CN105207174A CN201510602988.3A CN201510602988A CN105207174A CN 105207174 A CN105207174 A CN 105207174A CN 201510602988 A CN201510602988 A CN 201510602988A CN 105207174 A CN105207174 A CN 105207174A
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Abstract
The invention discloses a parameter setting method for a wind turbine set circuit breaker. The method comprises the steps that 1, an equivalent model of an electrical system and an equivalent model of an electric generator of a target wind turbine set are built; 2, short-circuit calculation is carried out according to the built models, and a fault current range of the wind turbine set during a short-circuit fault is obtained; the tolerance time of each component in the wind turbine to fault current during the short-circuit fault is calculated, and the tolerance capacity of the wind turbine set to the fault current is obtained; 3, according to the obtained fault current range and tolerance capacity, setting values of acting time and current in the circuit breaker to be set are determined according to the obtained fault current range and tolerance capacity, so that according to the setting values, when the current in the wind turbine set exceeds a fault current range, the circuit breaker to be set acts in the tolerance capacity range so as to open a circuit. The parameter setting method has the advantages that implementation is easy, parameters can be set by combining electrical characteristics and fault working conditions of the wind turbine, and parameter safety is high.
Description
Technical field
The present invention relates to the technical scheme of Wind turbines parameter tuning, particularly relate to a kind of parameter tuning method of Wind turbines circuit breaker.
Background technology
Inevitably there is the materials such as a large amount of flammable lubricant grease, flammable engine room cover and blade in Wind turbines, under the igniting of electric burning things which may cause a fire disaster, cause fire possibly, namely electric short circuit fault is the one of the main reasons causing unit to burn.Electric burning things which may cause a fire disaster is because electric fault causes, then electric fault needs the setup parameter relying on circuit breaker to implement protection, and thus the setting of circuit breaker parameters directly affects the security performance of Wind turbines electrical system.
Circuit breaker at present in wind-powered electricity generation industry generator access network system does not have the parameter tuning method of unified standard, adjust based on the method for conventional asynchronous motor mostly, namely with common asynchronous moter etc. for target, to circuit breaker setting setting value on the basis of protracted experience.But the real working condition of Wind turbines and this type of load have very large difference; in operative practice, also can find out that the setting value adopting aforesaid way to obtain can not provide Wind turbines protect completely, still there is the risk on fire because of electric fault in Wind turbines.
Short circuit is the fault condition that electrical system is the most serious, is divided into metallic short circuit and arc short circuit, and in wind turbine generator, the more difficult generation of simple metallic short circuit, normally arc short circuit or arc short circuit and the simultaneous short circuit of short circuit metal.In tuning process, blower fan electrical characteristic and fault condition is not considered by the adjust setting value that obtains of asynchronous machine, thus in Wind turbines based on the protection system of intelligent breaker and fuse come fast shut-off short circuit current protect time, if protection system set point (optimum configurations of circuit breaker) and Wind turbines short circuit characteristic do not mate when causing external circuit to fail to cut off or do not have corresponding arc extinguishing measure in time, because short dot voltage is enough high, arc short circuit can be controlled oneself, the huge energy that short circuit produces makes metal parts melting or directly volatilizees and the combustible of surrounding of igniting, thus cause that unit is on fire to be burnt.
Summary of the invention
The technical problem to be solved in the present invention is just: the technical problem existed for prior art, the invention provides a kind of implementation method simple, parameter tuning can be carried out in conjunction with the electrical characteristic of Wind turbines and fault condition and the parameter tuning method of the high Wind turbines circuit breaker of parameter safety performance.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is:
A defining method for Wind turbines circuit breaker setting value, step comprises:
1) Equivalent Model of electrical system and the Equivalent Model of generator in target Wind turbines is set up;
2) carry out short circuit calculation according to the Equivalent Model of described electrical system set up, the Equivalent Model of generator, acquire the fault current scope of Wind turbines when short trouble; To calculate in Wind turbines each parts respectively when short trouble to the tolerance time of fault current, acquire the tolerance of Wind turbines to fault current;
3) setting value of electric current and operate time in circuit breaker to be adjusted is determined according to the fault current scope, the tolerance that acquire, to make in Wind turbines electric current when exceeding described fault current scope by described setting value, circuit breaker to be adjusted in described tolerance action to cut off circuit.
As a further improvement on the present invention: described step 1) Equivalent Model of electrical system be transformer Equivalent Model, cable Equivalent Model between wind energy turbine set current collection equivalent line model and box type transformer to cabin combine the model of formation.
As a further improvement on the present invention, described step 2) in acquire the fault current scope of Wind turbines when short trouble concrete steps be: calculate the Equivalent Model of described electrical system, the short circuit current of the Equivalent Model of generator when short trouble, by the different exploitation short circuit currents of crowbar resistance in the Equivalent Model of the rotating speed of generator, described generator, acquire the fault current scope of Wind turbines when fault.
As a further improvement on the present invention, described step 3) in acquire Wind turbines and to the concrete steps of the tolerance of fault current be: calculating generator, current transformer, transformer are when short trouble to the tolerance time of fault current respectively, to get in each tolerance time calculated minimum tolerance time as the tolerance of Wind turbines to fault current.
Determine as a further improvement on the present invention: described step 3) that the concrete steps of the setting value of electric current and operate time in circuit breaker to be adjusted are: to obtain in circuit breaker to be adjusted electric current, operate time respectively with the fault current of Wind turbines, the relation of tolerance time, according to the described relation acquired and described step 2) the fault current scope that acquires, tolerance determine the setting value of electric current, operate time in circuit breaker to be adjusted.
The step of carrying out with actual operation parameters checking also is comprised as a further improvement on the present invention: described step 3).
As a further improvement on the present invention: described in when circuit breaker of adjusting is 2 segment protect circuit breaker; in described overload long delay protection the span of current setting be 1400 ~ 2500A, operate time setting value span be 1 ~ 60s, and in described hit/fast tripping protection, the span of current setting is 3000 ~ 15000A.
As a further improvement on the present invention: described in when circuit breaker of adjusting is 3 segmentation protective circuit breaker; in described overload long delay protection the span of current setting be 1400 ~ 2500A, operate time setting value span be 1-60s; in the protection of described short circuit short time-delay the span of current setting be 1400 ~ 7000A, operate time setting value span be 0.1-0.4s, and in described hit/fast tripping protection, the span of current setting is 3000 ~ 15000A.
As a further improvement on the present invention: described in when circuit breaker of adjusting is 4 segmentation protective circuit breaker, in described overload long delay protection, the span of current setting is 1400 ~ 2500A, operate time, the span of setting value was 1 ~ 60s, in described short circuit short time-delay protection, the span of current setting is 1400 ~ 7000A, operate time, the span of setting value was 0.1 ~ 0.4s, in described hit/fast tripping protection, the span of current setting is 3000 ~ 15000A, and the span of current setting is 200 ~ 2000A in described ground protection, operate time, the span of setting value was 0.1 ~ 0.4s.
Compared with prior art, the invention has the advantages that:
1) parameter tuning method of Wind turbines circuit breaker of the present invention, on the basis analyzing Wind turbines short circuit characteristic, in conjunction with the electrical characteristic of Wind turbines and fault condition, parameter tuning is carried out to circuit breaker in Wind turbines, by to electrical system, the Equivalent Model of generator carries out the tolerance time analysis of short circuit calculation and fault current, the electrical safety border of Wind turbines can be obtained, the parameter tuning value of circuit breaker is determined again based on the electrical safety border obtained, thus the setting value of circuit breaker and Wind turbines electrical characteristic are matched, when the electric fault of causing danger, circuit breaker can in time in the safety time that each parts tolerate action to cut off circuit, the security performance of circuit breaker setting parameter is high,
2) parameter tuning method of Wind turbines circuit breaker of the present invention, when determining the parameter tuning value of circuit breaker based on electrical safety border, make the electrical boundaries of circuit breaker within secure border, thus be failure to actuate at secure border inner breaker, when exceeding secure border, circuit breaker at the time internal cutting off circuit of safety, can ensure the electrical safety of Wind turbines;
3) parameter tuning method of Wind turbines circuit breaker of the present invention, setting value is determined further by the electric current of circuit breaker, operate time and the fault current of Wind turbines, the relation of tolerance time, make to obtain accurately in conjunction with the protective feature of circuit breaker within the scope of secured electrical, setting value reliably, improve the security performance of setting value further;
4) parameter tuning method of the present invention further for 2 sections, 3 sections, the circuit breaker of 4 segment protects obtains one group of setting parameter value; this group setting parameter value has taken into full account the short circuit electrical characteristic of Wind turbines and the protective feature of circuit breaker; thus can realize when Wind turbines breaks down protecting in time, fast, reduce electric fault to greatest extent, reduce blower fan generation electrically on fire.
Accompanying drawing explanation
Fig. 1 is the realization flow schematic diagram of the parameter tuning method of the present embodiment Wind turbines circuit breaker.
Fig. 2 is the equivalent model structure schematic diagram of the electrical system that the present embodiment is set up.
Fig. 3 is the equivalent model structure schematic diagram of the generator that the present embodiment is set up.
Embodiment
Below in conjunction with Figure of description and concrete preferred embodiment, the invention will be further described, but protection range not thereby limiting the invention.
As shown in Figure 1, a kind of parameter tuning method of Wind turbines circuit breaker, step comprises:
1) Equivalent Model of electrical system and the Equivalent Model of generator in target Wind turbines is set up;
2) carry out short circuit calculation according to the Equivalent Model of electrical system set up, the Equivalent Model of generator, acquire the fault current scope of Wind turbines when short trouble; To calculate in Wind turbines each parts respectively when short trouble to the tolerance time of fault current, acquire the tolerance of Wind turbines to fault current;
3) setting value of electric current and operate time in circuit breaker to be adjusted is determined according to the fault current scope, the tolerance that acquire, to make in Wind turbines electric current when exceeding fault current scope by setting value, circuit breaker to be adjusted in tolerance action to cut off circuit.
The present embodiment is on the basis analyzing Wind turbines short circuit characteristic, in conjunction with the electrical characteristic of Wind turbines and fault condition, parameter tuning is carried out to circuit breaker in Wind turbines, by to electrical system, the Equivalent Model of generator carries out the tolerance time analysis of short circuit calculation and fault current, the electrical safety border of Wind turbines can be obtained, the parameter tuning value of circuit breaker is determined again based on the electrical safety border obtained, thus the setting value of circuit breaker and Wind turbines electrical characteristic are matched, when the electric fault of causing danger, circuit breaker can in time in the safety time that each parts tolerate action to cut off circuit, the security performance of circuit breaker setting parameter is high.
The present embodiment determines the parameter tuning value of circuit breaker during based on electrical safety border, make the electrical boundaries of circuit breaker within secure border, thus be failure to actuate at secure border inner breaker, when exceeding secure border, circuit breaker at the time internal cutting off circuit of safety, can ensure the electrical safety of Wind turbines.
First the present embodiment by the analysis to Wind turbines actual operating data, obtains the electrical boundaries that blower fan normally works; Then by carrying out short circuit calculation to the Equivalent Model of electrical system set up, the Equivalent Model of generator, the electrical boundary of blower fan is obtained; Obtained the tolerance of Wind turbines again by the tolerance time of each parts, the tolerance time secure border that namely blower fan is minimum, specifically can obtain with the analytical calculation of duration based on short circuit harm.
As shown in Figure 2, the present embodiment step 1) in the Equivalent Model of electrical system be transformer Equivalent Model, cable Equivalent Model institute between wind energy turbine set current collection equivalent line model and box type transformer to cabin combines the model of formation, according to circuit theory, each Equivalent Model combined the electrical system Equivalent Model namely obtaining Wind turbines.Be illustrated in figure 3 the generator Equivalent Model that the present embodiment is set up, wherein by crowbar resistance, rotor impedance and the anti-conversion of rotor leakage inductance to stator side.
In the present embodiment, step 2) in acquire the fault current scope of Wind turbines when short trouble concrete steps be: calculate the Equivalent Model of electrical system, the short circuit current of the Equivalent Model of generator when short trouble, by the different exploitation short circuit currents of crowbar resistance in the Equivalent Model of the rotating speed of generator, generator, acquire the fault current scope of Wind turbines when fault.Due to generator speed, crowbar resistance value can be different, thus can obtain the short circuit current scope of fault.The present embodiment is in conjunction with the concrete space layout of Wind turbines electrical system; hazard analysis calculating is carried out on the basis that short-circuit analysis calculates, secured electrical protection zone divides; thus analytical calculation is carried out to the short circuit tolerance of Wind turbines combustible material everywhere, the electrical safety curve of combustible material can be drawn.
In the present embodiment, step 3) in acquire Wind turbines and to the concrete steps of the tolerance of fault current be: respectively calculating generator, current transformer, transformer when short trouble to the tolerance time of fault current, get minimum tolerance time in each tolerance time calculated and, as the tolerance of Wind turbines to fault current, the operate time of circuit breaker can be determined by minimum tolerance time.
In the present embodiment, step 3) in determine that the concrete steps of the setting value of electric current and operate time in circuit breaker to be adjusted are: to obtain in circuit breaker to be adjusted electric current, operate time respectively with the fault current of Wind turbines, the relation of tolerance time, according to the relation acquired and step 2) the fault current scope that acquires, tolerance determine the setting value of electric current, operate time in circuit breaker to be adjusted, concrete namely within the scope of the tolerance time meeting fault current, calculate setting current value and time parameter according to the specific algorithm of circuit breaker.By step 1), 2) the electrical safety border determined adjusts to circuit breaker; then can make to be failure to actuate with inner breaker at electrical safety bounds; when exceeding electrical safety border; circuit breaker, then at the time internal cutting off circuit of safety, protects the electrical safety of Wind turbines in time.In circuit breaker to be adjusted, electric current, operate time are the protective feature of circuit breaker with the fault current of Wind turbines, the relation of tolerance time respectively; thus by can obtain accurately in conjunction with the protective feature of circuit breaker within the scope of secured electrical, setting value, the further security performance of raising setting value reliably.
The present embodiment adopts above-mentioned parameter setting method when circuit breaker of adjusting is 2 segment protect circuit breaker; in overload long delay protection the span of current setting be 1400 ~ 2500A, operate time setting value span be 1 ~ 60s, and in hit/fast tripping protection, the span of current setting is 3000 ~ 15000A.
The present embodiment adopts above-mentioned parameter setting method when circuit breaker of adjusting is 3 segmentation protective circuit breaker; in overload long delay protection the span of current setting be 1400 ~ 2500A, operate time setting value span be 1 ~ 60s; in short circuit short time-delay protection the span of current setting be 1400 ~ 7000A, operate time setting value span be 0.1 ~ 0.4s, and in hit/fast tripping protection, the span of current setting is 3000 ~ 15000A.
The present embodiment adopts above-mentioned parameter setting method when circuit breaker of adjusting is 4 segmentation protective circuit breaker, in overload long delay protection, the span of current setting is 1400 ~ 2500A, operate time, the span of setting value was 1 ~ 60s, in short circuit short time-delay protection, the span of current setting is 1400 ~ 7000A, operate time, the span of setting value was 0.1 ~ 0.4s, in hit/fast tripping protection, the span of current setting is 3000 ~ 15000A, and the span of current setting is 200 ~ 2000A in ground protection, operate time, the span of setting value was 0.1 ~ 0.4s.
Adopt the above-mentioned setting value that the present embodiment parameter tuning method obtains; the short circuit electrical characteristic of Wind turbines and the protective feature of circuit breaker are taken into full account; thus can realize when Wind turbines breaks down protecting in time, fast, reduce electric fault to greatest extent, reduce blower fan generation electrically on fire.
The setting value that the present embodiment obtains according to the method described above, can adopt in a particular embodiment and arrange the mode such as toggle switch, knob and carry out choosing setting.
For the validity of checking above-mentioned parameter setting method, the present embodiment builds electrical model on ETAP emulation platform, substitute into each parameter obtained of adjusting according to the method described above and carry out simulating, verifying, verify by simulation results the setting value that the present embodiment employing above-mentioned parameter setting method obtains.
In the present embodiment, described step 3) after also comprise the step of carrying out with actual operation parameters checking.The waveform under a lot of normal operation and malfunction is have recorded in Wind turbines actual motion, the present embodiment is by the short circuit characteristic of the current Large-scale Wind Power unit of analytical calculation, by the data recorded when the operation of electrical system record and fault data, short circuit, the setting value that the present embodiment adopts above-mentioned parameter setting method to obtain is checked, to guarantee correctness, the credibility of circuit counting.
The present embodiment in engineering construction, then is checked the setting value that the present embodiment adopts above-mentioned parameter setting method to obtain according to actual result, can guarantee the validity of electic protection further.
Below to be further described the present invention for parameter tuning method when 1.5MW Wind turbines, S protection (the short delay of short circuit) in specific embodiment.
Step 1:
Set up electrical system Equivalent Model, generator Equivalent Model, the electrical system Equivalent Model of foundation as shown in Figure 2, generator Equivalent Model as shown in Figure 3.
Step 2:
The basis of the electrical system Equivalent Model set up, generator Equivalent Model calculates short circuit current, and the scope calculating short circuit current during fault is 2200 ~ 6000A.
The tolerance time of the fault current of analysis generator, current transformer, the present embodiment short trouble gets the short trouble fault of typical types, wherein:
Under short trouble, the tolerance time of cable:
wherein k is conductor material characteristic, and s is that cross-sectional area of conductor amasss, and I is fault current; ;
The tolerance time of generator under short trouble: >=100s;
The tolerance time of current transformer under short trouble: >=10;
The tolerance time of transformer under fault: >=30s;
Get the operate time of above-mentioned minimum tolerance time 10s as circuit breaker.
Step 3:
Circuit breaker S segment protect algorithm is shown below:
Wherein, T
sdfor the trip time, I
rfor short time delay current setting, t
sdfor short time delay time setting value, I is fault current.
By step 2) the minimum tolerance time that obtains, fault current scope substitute in formula (1), and obtain the setting range of circuit breaker: current setting range is 2200 ~ 6000A, operate time, setting range was: 0.1 ~ 0.4s; Carry out reliability expansion again to this setting range, the setting range namely obtaining electric current is: 1400 ~ 7000A, and the setting range of operate time is: 0.1 ~ 0.4s.
Above-mentioned just preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Therefore, every content not departing from technical solution of the present invention, according to the technology of the present invention essence to any simple modification made for any of the above embodiments, equivalent variations and modification, all should drop in the scope of technical solution of the present invention protection.
Claims (9)
1. a parameter tuning method for Wind turbines circuit breaker, is characterized in that step comprises:
1) Equivalent Model of electrical system and the Equivalent Model of generator in target Wind turbines is set up;
2) carry out short circuit calculation according to the Equivalent Model of described electrical system set up, the Equivalent Model of generator, acquire the fault current scope of Wind turbines when short trouble; To calculate in Wind turbines each parts respectively when short trouble to the tolerance time of fault current, acquire the tolerance of Wind turbines to fault current;
3) setting value of electric current and operate time in circuit breaker to be adjusted is determined according to the fault current scope, the tolerance that acquire, to make in Wind turbines electric current when exceeding described fault current scope by described setting value, circuit breaker to be adjusted in described tolerance action to cut off circuit.
2. the parameter tuning method of Wind turbines circuit breaker according to claim 1, it is characterized in that, described step 1) in the Equivalent Model of electrical system be transformer Equivalent Model, cable Equivalent Model between wind energy turbine set current collection equivalent line model and box type transformer to cabin combine the model of formation.
3. the parameter tuning method of Wind turbines circuit breaker according to claim 2, it is characterized in that, described step 2) in acquire the fault current scope of Wind turbines when short trouble concrete steps be: calculate the Equivalent Model of described electrical system, the short circuit current of the Equivalent Model of generator when short trouble, by the different exploitation short circuit currents of crowbar resistance in the Equivalent Model of the rotating speed of generator, described generator, acquire the fault current scope of Wind turbines when fault.
4. the parameter tuning method of Wind turbines circuit breaker according to claim 3, it is characterized in that, described step 3) in acquire Wind turbines and to the concrete steps of the tolerance of fault current be: calculating generator, current transformer, transformer are when short trouble to the tolerance time of fault current respectively, to get in each tolerance time calculated minimum tolerance time as the tolerance of Wind turbines to fault current.
5. according to the parameter tuning method of the Wind turbines circuit breaker in Claims 1 to 4 described in any one, it is characterized in that: described step 3) in determine that the concrete steps of the setting value of electric current and operate time in circuit breaker to be adjusted are: to obtain in circuit breaker to be adjusted electric current, operate time respectively with the fault current of Wind turbines, the relation of tolerance time, according to the described relation acquired and described step 2) the fault current scope that acquires, tolerance determine the setting value of electric current, operate time in circuit breaker to be adjusted.
6. the defining method of Wind turbines circuit breaker setting value according to claim 5, is characterized in that, described step 3) after also comprise the step of carrying out with actual operation parameters checking.
7. according to the parameter tuning method of the Wind turbines circuit breaker in Claims 1 to 4 described in any one; it is characterized in that: described in when circuit breaker of adjusting is 2 segment protect circuit breaker; in described overload long delay protection the span of current setting be 1400 ~ 2500A, operate time setting value span be 1 ~ 60s, and in described hit/fast tripping protection, the span of current setting is 3000 ~ 15000A.
8. according to the parameter tuning method of the Wind turbines circuit breaker in Claims 1 to 4 described in any one, it is characterized in that: described in when circuit breaker of adjusting is 3 segmentation protective circuit breaker, in described overload long delay protection, the span of current setting is 1400 ~ 2500A, operate time, the span of setting value was 1 ~ 60s, in described short circuit short time-delay protection, the span of current setting is 1400 ~ 7000A, operate time, the span of setting value was 0.1 ~ 0.4s, and the span of current setting is 3000 ~ 15000A in described hit/fast tripping protection.
9. according to the parameter tuning method of the Wind turbines circuit breaker in Claims 1 to 4 described in any one, it is characterized in that: described in when circuit breaker of adjusting is 4 segmentation protective circuit breaker, in described overload long delay protection, the span of current setting is 1400 ~ 2500A, operate time, the span of setting value was 1 ~ 60s, in described short circuit short time-delay protection, the span of current setting is 1400 ~ 7000A, operate time, the span of setting value was 0.1 ~ 0.4s, in described hit/fast tripping protection, the span of current setting is 3000 ~ 15000A, and the span of current setting is 200 ~ 2000A in described ground protection, operate time, the span of setting value was 0.1 ~ 0.4s.
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| CN108267651A (en) * | 2016-12-30 | 2018-07-10 | 孙麓轩 | The safety detection method and device of distribution system |
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