CN111310379B - Optimal design method for medium-pressure medium-speed semi-integrated transmission system - Google Patents
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- CN111310379B CN111310379B CN202010168813.7A CN202010168813A CN111310379B CN 111310379 B CN111310379 B CN 111310379B CN 202010168813 A CN202010168813 A CN 202010168813A CN 111310379 B CN111310379 B CN 111310379B
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Abstract
According to the optimal design method of the medium-voltage medium-speed semi-integrated transmission system, the initial design scheme of a generator, a gear box and a converter is obtained according to the design parameters and requirements of the whole machine, single-machine simulation of the generator is carried out to determine the optimal scheme of the generator with the short-circuit moment of a transmission chain smaller than 2.5TN, the optimal scheme of the generator and the initial scheme of the converter are subjected to combined simulation to finally obtain the optimal scheme of the generator and the gear box with the short-circuit moment of the transmission chain smaller than 2.5TN, the torque ripple smaller than or equal to 5% and the gear box load not increased, and further obtain the transmission chain scheme. When the scheme is applied to a 6.2MW offshore wind turbine generator, an 8MW offshore wind turbine generator and a 10MW offshore wind turbine generator, the probability of the two sets of windings of the generator being short-circuited at the same time is greatly reduced, torque pulsation is reduced, and a transmission chain is safer and more reliable; because the transmission chain does not slide, and the load of the gearbox is not increased, the transmission chain is lighter and more economical.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to an optimal design method of a medium-pressure medium-speed semi-integrated transmission system.
Background
At present, the wind power industry is developed to the deep open sea at home and abroad, the power level is higher and higher, the level of 10MW is reached, the requirements on the reliability and the maintainability of a complete machine and critical parts are very high due to the particularity of the offshore wind power environment, particularly the characteristic of high later maintenance cost, and meanwhile, the economic requirements on a wind turbine generator are higher due to the domestic wind-fire same-price trend. With the research and development of high-power-level units of 10MW level in recent years, in order to reduce cost and improve efficiency, medium-speed integrated and semi-integrated transmission chains are mostly adopted, the rotating speed range of the transmission chains is 200-500 rpm, and a generator is suspended on a gear box, so that the length of the transmission chains is shortened without adopting a coupler, and the cost of the whole machine is reduced; and a medium-voltage power generation system is adopted, namely, the voltage range of the generator and the converter is 3000V-6600V.
The design has the advantages that the short-circuit torque generated by two-phase short circuit of the generator is difficult to influence the gear box, but the defects of the design are very obvious, namely the length of a transmission chain is longer due to the design of the coupler, the coupler at the 10MV level is mainly provided by foreign manufacturers, and the ordering period is long and the cost is high.
In order to improve the economy and guarantee the maintainability in the design of a high-power offshore wind turbine, the transmission chain mostly adopts an integrated scheme to a certain degree, and a coupler is not adopted in order to further shorten the length of the transmission chain, reduce the cost of the whole machine and shorten the research and development period. However, a big problem in this scheme is that when the generator is operated under a rated full-load working condition, if two-phase short circuit occurs suddenly, the generated short-circuit torque can reach 5-6 times of the rated torque value, and the limit torque considered in the design of components such as a gear box in the transmission chain is about 2.5 times of the rated torque (namely 2.5TN), so that the large short-circuit torque can cause irreversible damage to the gear box, a main shaft and a main bearing in the transmission chain, and can directly damage the transmission chain in serious cases.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an optimal design method of a medium-pressure medium-speed semi-integrated transmission system, which at least solves the technical problem that a coupling-free transmission chain is damaged due to large short-circuit torque of a generator in the design of the medium-pressure medium-speed semi-integrated transmission system of a wind turbine generator.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an optimal design method for a medium-pressure medium-speed semi-integrated transmission system comprises the following steps:
s1, determining design input parameters of a generator, a gear box and a converter according to design parameters and design requirements of the whole machine, and further obtaining a gear box preliminary scheme, a generator preliminary scheme and a converter preliminary scheme, wherein the gear box preliminary scheme comprises the gear box preliminary parameters and the gear box design load, and the generator preliminary scheme comprises an electromagnetic design scheme;
s2, establishing a three-dimensional model based on a generator finite element by adopting an Ansoft platform according to the electromagnetic design scheme, and performing generator single-machine simulation based on Ansoft to obtain a short-circuit time sequence table containing millisecond-level short-circuit torque values;
adding the short circuit time sequence table which is obtained by simulation and contains the millisecond short circuit moment value into blank to carry out whole machine transmission chain simulation to obtain the transmission chain short circuit moment, and judging as follows:
if the transmission chain short-circuit moment is greater than or equal to 2.5TN, optimizing the generator preliminary scheme until the transmission chain short-circuit moment is less than 2.5TN to obtain a generator optimization scheme and a generator finite element optimization model;
s3, matlab combined harmonic simulation is carried out on the generator optimization scheme and the converter preliminary scheme, then the simulation result is used as an excitation source and added into the generator finite element optimization model established by Ansoft, and the generation system torque ripple combined simulation is carried out to obtain a millisecond-level torque ripple time sequence table;
extracting a torque ripple frequency spectrogram according to a torque ripple time sequence table obtained by simulation, adding the torque ripple frequency spectrogram into blank to simulate the whole machine transmission chain to obtain torque ripple, and judging as follows:
if the torque ripple is larger than 5%, optimizing a converter control strategy, optimizing a converter preliminary scheme, and repeating the step S3;
if the torque ripple is less than or equal to 5%, adding the torque ripple and the preliminary parameters of the gearbox into the blank joint simulation to calculate the running load of the gearbox, and judging as follows:
and if the operating load of the gearbox is greater than the design load of the gearbox, optimizing the generator scheme and the gearbox scheme, and then performing the step S2 and the step S3 until the torque ripple is less than or equal to 5% and the load of the gearbox is not increased so as to determine the gearbox scheme and the generator scheme, further determine the transmission chain scheme and end the simulation.
Optionally, in step S1, the electromagnetic design includes a d-axis synchronous inductor, a q-axis synchronous inductor, a d-axis transient inductor, and a q-axis transient inductor; in step S2, the generator preliminary solution is optimized by adjusting the d-axis transient inductance and the q-axis transient inductance.
Alternatively, in step S2, when performing Ansoft-based generator stand-alone simulation, determining the torque ripple amplitude caused by the cogging torque of the generator itself; in step S3, when the torque ripple is greater than 5%, it is determined whether the cogging torque is a main cause of large torque ripple in conjunction with the torque ripple amplitude due to the cogging torque of the generator itself: if the cogging torque is the main factor, optimizing the generator scheme, and then performing step S2 and step S3; if the cogging torque is not the main reason, optimizing the converter control strategy, optimizing the converter preliminary scheme, and repeating the step S3.
Optionally, the optimizing converter control strategy comprises adjusting converter carrier ratio and switching frequency.
The invention has the beneficial effects that:
according to the optimal design method of the medium-voltage medium-speed semi-integrated transmission system, the initial design scheme of a generator, a gear box and a converter is obtained according to the design parameters and requirements of the whole machine, single-machine simulation of the generator is carried out to determine the optimal scheme of the generator with the short-circuit moment of a transmission chain smaller than 2.5TN, the optimal scheme of the generator and the initial scheme of the converter are subjected to combined simulation to finally obtain the optimal scheme of the generator and the gear box with the short-circuit moment of the transmission chain smaller than 2.5TN, the torque ripple smaller than or equal to 5% and the gear box load not increased, and further obtain the transmission chain scheme. When the scheme is applied to a 6.2MW offshore wind turbine generator, an 8MW offshore wind turbine generator and a 10MW offshore wind turbine generator, the probability of the two sets of windings of the generator being short-circuited at the same time is greatly reduced, torque pulsation is reduced, and a transmission chain is safer and more reliable; because the transmission chain does not slide, and the load of the gearbox is not increased, the transmission chain is lighter and more economical.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a flow chart of a method for optimizing the design of a medium pressure, medium speed, semi-integrated transmission system;
FIG. 2 is a flow chart of another embodiment of a method for optimizing the design of a medium pressure, medium speed, semi-integrated transmission system.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
Referring to fig. 1, the method for optimally designing a medium-pressure medium-speed semi-integrated transmission system provided by the invention comprises the following steps:
s1, determining design input parameters of a generator, a gear box and a converter according to the power grade, rated wind speed, wind speed range, maximum wind speed, transmission chain type, natural environment and power grid operation requirements of the design parameters of the whole machine, specifically comprising the type, rated power, rated voltage, phase number, rated rotating speed, operating rotating speed range, maximum rotating speed, installation inclination angle, operating environment temperature, vibration grade and the like of the generator, the type, rated power, voltage grade, power grid operation conditions and the like of the converter, the type, input rated torque, output rated torque, load and transmission ratio of the gear box, and further obtaining a gear box preliminary scheme, a generator preliminary scheme and a converter preliminary scheme according to the design input parameters. Wherein the gearbox preliminary solution includes gearbox preliminary parameters and gearbox design loads and the generator preliminary solution includes an electromagnetic design solution. Specifically, the electromagnetic design scheme comprises a d-axis synchronous inductor, a q-axis synchronous inductor, a d-axis transient inductor and a q-axis transient inductor. Specifically, the gearbox design loads are gearbox loads without torque ripple intervention.
S2, establishing a three-dimensional model based on a generator finite element by adopting an Ansoft platform according to the electromagnetic design scheme, and performing generator single-machine simulation based on Ansoft to obtain a short-circuit time sequence table containing millisecond-level short-circuit torque values;
adding the short circuit time sequence table which is obtained by simulation and contains the millisecond short circuit moment value into blank to carry out whole machine transmission chain simulation to obtain the transmission chain short circuit moment, and judging as follows:
if the short-circuit moment of the transmission chain is larger than or equal to 2.5TN, the transmission chain can slip, and the generator preliminary scheme is optimized by adjusting the d-axis transient inductance and the q-axis transient inductance until the short-circuit moment of the transmission chain is smaller than 2.5TN, so that the generator optimization scheme and the generator finite element optimization model are obtained.
And S3, performing matlab combined harmonic simulation on the generator optimization scheme and the converter preliminary scheme. Specifically, d-axis synchronous inductance, q-axis synchronous inductance, d-axis transient inductance and q-axis transient inductance of the generator are input into a programmed converter program to calculate a generator mathematical model; then carrying out harmonic simulation to obtain harmonic frequency, phase and amplitude information of voltage and current of the power generation system; then adding a simulation result as an excitation source into the generator finite element optimization model established by Ansoft to perform combined simulation of the torque pulsation of the power generation system, and obtaining a millisecond-level torque pulsation timing table comprising torque amplitude, phase and frequency; extracting a torque ripple frequency spectrogram according to a torque ripple time sequence table obtained by simulation; adding the blade into the torque ripple spectrogram to simulate the whole machine transmission chain, obtaining the torque ripple, and judging as follows:
if the torque ripple is larger than 5%, optimizing a converter control strategy, specifically comprising adjusting a converter carrier ratio and a switching frequency, optimizing a converter preliminary scheme, and repeating the step S3;
if the torque ripple is less than or equal to 5%, adding the torque ripple and the preliminary parameters of the gearbox into blade joint simulation to calculate the running load of the gearbox, wherein the running load of the gearbox is the gearbox load with torque ripple intervention, and judging as follows:
and if the operating load of the gearbox is greater than the design load of the gearbox, optimizing the generator scheme and the gearbox scheme, and then performing the step S2 and the step S3 until the torque ripple is less than or equal to 5% and the load of the gearbox is not increased so as to determine the gearbox scheme and the generator scheme, further determine the transmission chain scheme and end the simulation. In particular, the converter strategy is determined when the drive train short-circuit torque is less than 2.5TN, the torque ripple is less than or equal to 5%, and the gearbox load is not increased.
When the scheme is applied to a 6.2MW offshore wind turbine generator, an 8MW offshore wind turbine generator and a 10MW offshore wind turbine generator, the probability of the two sets of windings of the generator being short-circuited at the same time is greatly reduced, torque pulsation is reduced, and a transmission chain is safer and more reliable; because the transmission chain does not slide, and the load of the gearbox is not increased, the transmission chain is lighter and more economical.
As a further improvement to the above solution, referring to fig. 2, in step S2, when performing an Ansoft-based generator stand-alone simulation, determining a torque ripple amplitude caused by the cogging torque of the generator itself; in step S3, when the torque ripple is greater than 5%, it is determined whether the cogging torque is a main cause of large torque ripple, in conjunction with the torque ripple width due to the cogging torque of the generator itself: if the cogging torque is the main factor, optimizing the generator scheme, and then performing step S2 and step S3; if the cogging torque is not the main reason, optimizing the converter control strategy, optimizing the converter preliminary scheme, and repeating the step S3.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (4)
1. The optimal design method of the medium-pressure medium-speed semi-integrated transmission system is characterized by comprising the following steps of:
s1, determining design input parameters of a generator, a gear box and a converter according to design parameters and design requirements of the whole machine, and further obtaining a gear box preliminary scheme, a generator preliminary scheme and a converter preliminary scheme, wherein the gear box preliminary scheme comprises the gear box preliminary parameters and the gear box design load, and the generator preliminary scheme comprises an electromagnetic design scheme;
s2, establishing a three-dimensional model based on a generator finite element by adopting an Ansoft platform according to the electromagnetic design scheme, and performing generator single-machine simulation based on Ansoft to obtain a short-circuit time sequence table containing millisecond-level short-circuit torque values;
adding the short circuit time sequence table which is obtained by simulation and contains the millisecond short circuit moment value into blank to carry out whole machine transmission chain simulation to obtain the transmission chain short circuit moment, and judging as follows:
if the transmission chain short-circuit moment is greater than or equal to 2.5TN, optimizing the generator preliminary scheme until the transmission chain short-circuit moment is less than 2.5TN to obtain a generator optimization scheme and a generator finite element optimization model;
s3, matlab combined harmonic simulation is carried out on the generator optimization scheme and the converter preliminary scheme, then the simulation result is used as an excitation source and added into the generator finite element optimization model established by Ansoft, and the generation system torque ripple combined simulation is carried out to obtain a millisecond-level torque ripple time sequence table;
extracting a torque ripple frequency spectrogram according to a torque ripple time sequence table obtained by simulation, adding the torque ripple frequency spectrogram into blank to simulate the whole machine transmission chain to obtain torque ripple, and judging as follows:
if the torque ripple is larger than 5%, optimizing a converter control strategy, optimizing a converter preliminary scheme, and repeating the step S3;
if the torque ripple is less than or equal to 5%, adding the torque ripple and the preliminary parameters of the gearbox into the blank joint simulation to calculate the running load of the gearbox, and judging as follows:
if the operating load of the gearbox is greater than the design load of the gearbox, simultaneously optimizing the generator scheme and the gearbox scheme, and then performing the step S2 and the step S3 until the torque ripple is less than or equal to 5% and the load of the gearbox is not increased so as to determine the gearbox scheme and the generator scheme, further determine the transmission chain scheme and end the simulation.
2. The optimal design method of the medium-pressure medium-speed semi-integrated transmission system according to claim 1, characterized in that:
in step S1, the electromagnetic design includes a d-axis synchronous inductor, a q-axis synchronous inductor, a d-axis transient inductor, and a q-axis transient inductor;
in step S2, the generator preliminary solution is optimized by adjusting the d-axis transient inductance and the q-axis transient inductance.
3. The optimal design method of the medium-pressure medium-speed semi-integrated transmission system according to claim 1, characterized in that:
in step S2, when performing the Ansoft-based generator stand-alone simulation, determining a torque ripple amplitude caused by the cogging torque of the generator itself;
in step S3, when the torque ripple is greater than 5%, it is determined whether the cogging torque is a main cause of large torque ripple, in conjunction with the torque ripple width due to the cogging torque of the generator itself:
if the cogging torque is the main factor, optimizing the generator scheme, and then performing step S2 and step S3;
if the cogging torque is not the main reason, optimizing the converter control strategy, optimizing the converter preliminary scheme, and repeating the step S3.
4. The optimal design method of the medium-pressure medium-speed semi-integrated transmission system according to claim 1 or 3, characterized in that: the optimized converter control strategy comprises the adjustment of a converter carrier ratio and a switching frequency.
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