CN103633624A - Comprehensive protection method for direct-drive permanent magnet wind driven generator - Google Patents
Comprehensive protection method for direct-drive permanent magnet wind driven generator Download PDFInfo
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Abstract
The invention discloses a comprehensive protection method for a direct-drive permanent magnet wind driven generator, which comprises the following four synchronous operation flows, namely a protection process in which an overcurrent protection method is matched with an over-temperature protection method and an insulation protection method, a protection process in which the overcurrent protection method is matched with the over-temperature protection method and the insulation protection method, a protection process in which an unbalance protection method is matched with the over-temperature protection method and the insulation protection method, and a protection process in which the over-temperature protection method is matched with the insulation protection method, wherein when any one protection process judges that shutdown protection is required, other protection processes of the whole method are stopped, and the generator is maintained and protected. The invention completes more effective and more perfect protection for the direct drive type permanent magnet wind driven generator winding through the process, and solves the technical problems of limited effect and imperfect protection of the generator maintenance method in the prior art.
Description
Technical field
The present invention relates to electric motor protecting technical field, particularly a kind of comprehensive method of protection for direct-drive permanent magnet wind turbine generator.
Background technology
Along with the technology of wind power generation industry is gradually ripe, the efficiency of wind-driven generator is required also in continuous raising in recent years, and direct drive permanent magnetic generator as a kind of high efficiency type in wind power generation industry by a large amount of uses; Meanwhile, for further improving the efficiency of wind-driven generator, various types of power electronic equipments are also accompanied by direct drive permanent magnetic generator and are applied to together in wind power generation industry.
Yet, in the common use of direct-drive permanent magnet wind turbine generator and power electronic equipment, because Design of Compatibility is abundant not and far design is thorough not, make direct drive permanent magnetic send out the threat that wind-force electrical machinery is often subject to the electric undesirable elements such as overvoltage, overcurrent, degree of unbalance.Meanwhile, because the running environment of wind-driven generator is too harsh, make direct drive permanent magnetic send out the threat that wind-force electrical machinery is often subject to the poor environment factor of the impact insulation such as excess temperature, high humidity.
The method about protection permanent-magnetic wind driven generator up-to-date in prior art mainly contains several patent applications, and " a kind of method of motor overvoltage protection ", the application number that application number is 201310228680.8 is that 201310229157.7 " a kind of current of electric over-current protection methods " and application number are 201320085936.X " motor three-phase imbalance protective device ".Yet; above-mentioned patent is often only carried out single basic protection design and basic guard method research for electric undesirable elements such as overvoltage, overcurrent, degree of unbalance; and the effect that single so basic protection design and basic guard method are played may too be limited to, cannot provide more effectively and more fully protection direct-drive permanent magnet wind turbine generator.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of comprehensive method of protection for direct-drive permanent magnet wind turbine generator, by using over-voltage protection method and coordinating of insulation protection method, solved the degree of injury that cannot judge the insulating material of direct-drive permanent magnet wind turbine generator winding due to over-voltage protection method, when the overvoltage number of times of appearance surpasses setting protection number of times or occurs that the total duration of overvoltage surpasses setting protection duration, can only to direct-drive permanent magnet wind turbine generator, carry out effect by this measure of starter-generator stoppage protection limited and protect incomplete technical problem.
The invention provides a kind of comprehensive method of protection for direct-drive permanent magnet wind turbine generator, comprise following four processes of synchronously carrying out: by over-voltage protection method, coordinate the protection process of using with insulation protection method, by over-current protection method, coordinate the protection process of using with excess temperature protection method and insulation protection method, by degree of unbalance guard method, coordinate the protection process of using with excess temperature protection method and insulation protection method, and the protection process that coordinates utilization by excess temperature protection method with insulation protection method, when above any one protection process judgement need to be carried out generator maintenance protection, stop other protection processes and directly carry out generator maintenance protection.
The described protection process of using that coordinates with insulation protection method by over-voltage protection method specifically comprises: the three-phase voltage to generator is monitored respectively, judge the whether overvoltage of any phase voltage, as all not overvoltages of three-phase voltage, return to the three-phase voltage that continues monitoring generator; As any phase voltage overvoltage, in setting cycle, the duration of overvoltage number of times and each overvoltage is added up, and judge whether overvoltage number of times surpasses protection number of times and the total duration of overvoltage set and surpass the protection duration of setting, as all do not surpassed and return to the three-phase voltage that continues monitoring generator; As surpassing protection number of times or the total duration of overvoltage set, overvoltage number of times surpasses the protection duration of setting; generator carries out stoppage protection; then the winding of generator is carried out to megger test; and whether judgement is less than test result the protection value of setting; if test result is less than the protection value of setting; generator is safeguarded protection, if be not less than the protection value of setting, continues the three-phase voltage of monitoring generator.
The described protection process of using that coordinates with excess temperature protection method and insulation protection method by over-current protection method comprises: the three-phase current to generator is monitored respectively, judges whether overcurrent of any phase current, if three-phase current is overcurrent not all, return to the three-phase current that continues monitoring generator, if any phase current overcurrent, over-current phenomenon avoidance is carried out to the analysis of electric current instantaneous short-circuit, and judge that the maximum whether any one electric current surpasses rated current sets multiple, if any phase current surpass rated current maximum set multiple, carry out generator outage protection, if three-phase current all do not surpass rated current maximum set multiple, over-current phenomenon avoidance is carried out to current overload analysis, then carried out flow/time length statistics, and the crossing flow/time length and whether surpass the protection duration of setting of judgement statistics, if do not surpass the protection duration of setting, return to the three-phase current that continues monitoring generator, if surpass the protection duration of setting, whether the winding temperature that judges generator surpasses the protection temperature of setting, if do not surpass the protection temperature of setting, return to the three-phase current that continues monitoring generator, if surpass the protection temperature of setting, carry out generator outage protection, after generator carries out stoppage protection, winding is carried out to megger test, and judge whether test result is less than the protection value of setting, if test result is less than the protection value of setting, generator is safeguarded protection, if be not less than the protection value of setting, continue the three-phase current of monitoring generator.
The described protection process of using that coordinates with excess temperature protection method and insulation protection method by degree of unbalance guard method comprises: the three-phase current to generator is monitored respectively, then will carry out degree of unbalance analysis to three-phase current, and judge whether any phase current and the ratio of the average current of three-phase surpass the protection value of setting, if any phase current is all no more than setting protection value with the ratio of the average current of three-phase, return to the three-phase current that continues monitoring generator; If any phase current surpasses setting protection value with the ratio of the average current of three-phase, judge whether winding temperature surpasses the protection temperature of setting, if the winding temperature of generator does not surpass the protection temperature of setting, return to the three-phase current of continuation monitoring generator; If the winding temperature of generator surpasses the protection temperature of setting, generator carries out stoppage protection, then winding is carried out to megger test, and judges whether test result is less than the protection value setting of setting; If test result is less than the protection value of setting, generator is safeguarded protection, if be not less than the protection value of setting, continues the three-phase current of monitoring generator.
The described protection process of using that coordinates with insulation protection method by excess temperature protection method comprises: the winding temperature to generator is monitored, and judge whether winding temperature surpasses the protection temperature of setting, if winding temperature does not surpass the protection temperature of setting, return to the winding temperature that continues monitoring generator; If winding temperature surpasses the protection temperature of setting; carry out generator and carry out stoppage protection; then winding is carried out to megger test; and judge whether test result is less than the protection value of setting; if test result is less than the protection value of setting; generator is safeguarded protection, if be not less than the protection value of setting, continues the winding temperature of monitoring generator.
The advantage that the present invention has is:
The invention provides a kind of comprehensive method of protection for direct-drive permanent magnet wind turbine generator, by over-current protection method, coordinate utilization with excess temperature protection method and insulation protection method, solved because over-current protection method both cannot judge that whether the heat energy producing on direct-drive permanent magnet wind turbine generator winding really surpasses the rated heat input, rated heat load of self, also cannot judge the degree of injury of the insulating material of direct-drive permanent magnet wind turbine generator winding; So when any phase current surpasses 1.2 times of rated current but surpasses 2 times of rated current; need only flow/time length and surpassed setting protection duration; over-current protection method is just thought current overload, and over-current protection method can only carry out effect finite sum to direct-drive permanent magnet wind turbine generator by this measure of starter-generator stoppage protection and protects incomplete technical problem.
The invention provides a kind of comprehensive method of protection for direct-drive permanent magnet wind turbine generator, by degree of unbalance guard method, coordinate utilization with excess temperature protection method and insulation protection method, solved because degree of unbalance guard method both cannot judge that whether the heat energy producing on direct-drive permanent magnet wind turbine generator winding really surpasses the rated heat input, rated heat load of self, also cannot judge the degree of injury of the insulating material of direct-drive permanent magnet wind turbine generator winding; So as long as when the ratio of any phase current and the average current of three-phase will surpass setting protection value; three-phase current unbalance is just thought in degree of unbalance guard method, and degree of unbalance guard method can only be carried out effect finite sum to direct-drive permanent magnet wind turbine generator by this measure of starter-generator stoppage protection and protects incomplete technical problem.
The invention provides a kind of comprehensive method of protection for direct-drive permanent magnet wind turbine generator; by excess temperature protection method, coordinate utilization with insulation protection method; solved the degree of injury that cannot judge the insulating material of direct-drive permanent magnet wind turbine generator winding due to excess temperature protection method; so when winding temperature surpasses setting protection temperature, excess temperature protection method can only be protected direct-drive permanent magnet wind turbine generator by this measure of starter-generator stoppage protection.And insulation protection method can help over-voltage protection method to judge the degree of injury of the insulating material of direct-drive permanent magnet wind turbine generator winding, then determine whether that the effect finite sum that starter-generator is safeguarded protects incomplete technical problem.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the comprehensive method of protection for direct-drive permanent magnet wind turbine generator provided by the invention;
Fig. 2 is by the flow chart that coordinates the protection process of using of over-voltage protection method and insulation protection method in the present invention;
Fig. 3 is the flow chart that coordinates the protection process of using in the present invention by over-current protection method with excess temperature protection method and insulation protection method;
Fig. 4 coordinates the flow chart of the protection process of using with excess temperature protection method and insulation protection method by degree of unbalance guard method in the present invention;
Fig. 5 is the flow chart that coordinates the protection process of using in the present invention by excess temperature protection method with insulation protection method.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, can be implemented, but illustrated embodiment is not as a limitation of the invention so that those skilled in the art can better understand the present invention also.
The invention provides a kind of comprehensive method of protection for direct-drive permanent magnet wind turbine generator; as shown in Figure 1, comprise the following Four processes carrying out side by side: by over-voltage protection method, coordinate the protection process of using, the protection process that coordinates utilization by over-current protection method with excess temperature protection method and insulation protection method with insulation protection method, by degree of unbalance guard method, coordinate the protection process of using, the protection process that coordinates utilization by excess temperature protection method with insulation protection method with excess temperature protection method and insulation protection method.The present invention synchronously uses the protection process of above-mentioned four steps; when any one protection process judgement need to be carried out generator maintenance protection; other each protection process flow process all stop; and directly carry out generator, safeguard protection; if all deterministic processes are not all carried out stoppage protection; continue monitoring, finally complete direct-drive permanent magnet wind turbine generator winding is carried out to more effective and more perfect protection.
In the present invention, by over-voltage protection method, coordinate the protection process of utilization with insulation protection method as shown in Figure 2; comprise following step: first the three-phase voltage of generator is monitored respectively; and any phase voltage setting multiple of whether surpassing rated voltage is set to the Rule of judgment of whether overvoltage; this is set multiple and determines according to the designing requirement of motor itself; and comprehensive concrete test and determining, preferably theoretical multiple value is 2.0～2.5 times.As three-phase voltage is all no more than the setting multiple of (comprise and equaling, below all identical definition) rated voltage, return to the three-phase voltage that continues monitoring generator.As any phase voltage surpasses, (do not comprise and equaling, below all identical definition) the setting multiple of rated voltage, in setting cycle, the duration of overvoltage number of times and each overvoltage is added up, and whether overvoltage number of times surpasses the protection number of times set and the total duration of overvoltage and whether surpasses the protection duration of setting and whether be set to the Rule of judgment of starter-generator maintenance protection, as overvoltage number of times does not surpass protection number of times and the total duration of overvoltage set, do not surpass the protection duration of setting, return to the three-phase voltage that continues monitoring generator; As surpassing protection number of times or the total duration of overvoltage set, overvoltage number of times surpasses the protection duration of setting; generator carries out stoppage protection; then the winding of generator is carried out to megger test, and the protection value whether test result is less than setting is set to the Rule of judgment whether starter-generator is safeguarded protection.If test result is less than the protection value of setting, generator is safeguarded protection, if be not less than the protection value of setting, continues the three-phase voltage of monitoring generator.The protection duration of described setting, the protection value of setting all need to determine according to the designing requirement of motor itself, and can determine according to concrete test.
In the present invention, by over-current protection method, coordinate the protection process of utilization with excess temperature protection method and insulation protection method as shown in Figure 3; first the three-phase current to generator is monitored respectively; and whether any phase current setting multiple of whether surpassing rated current is set to the Rule of judgment of overcurrent; the setting multiple of this rated current can be set according to motor itself; and can determine according to specific experiment, be preferably 1.2～1.5 times.If three-phase current does not all surpass the setting multiple of rated current, return to the three-phase current that continues monitoring generator; If any phase current surpasses the setting multiple of rated current, over-current phenomenon avoidance is carried out to the analysis of electric current instantaneous short-circuit.Then whether the setting multiple that whether any phase current surpasses rated current is set to the Rule of judgment of starter-generator stoppage protection, and this sets multiple can be according to motor setting itself, and can determine according to specific experiment, is preferably 2.0～2.5 times.If any phase current, over 2.0～2.5 times of rated current, carries out generator outage protection in three-phase current, if three-phase current does not all surpass 2.0～2.5 times of rated current, over-current phenomenon avoidance is carried out to current overload analysis, in setting cycle to meeting that any phase current surpasses rated current 1.2～1.5 but the electric current that do not surpass 2.0～2.5 times of rated current, carried out flow/time length statistics, and the crossing flow/time length and whether surpass the protection duration of setting and whether be set to the Rule of judgment of starter-generator stoppage protection of statistics, if do not surpass the protection duration of setting, return to the three-phase current that continues monitoring generator, if do not surpass the protection duration of setting, return to the three-phase current that continues monitoring generator, if surpass the protection duration of setting, the generator windings temperature in this stage is detected, whether the winding temperature of this stage generator is surpassed to the protection temperature setting of setting and whether be set to the Rule of judgment of starter-generator stoppage protection, the protection temperature of described setting refers to the temperature when heat load of motor winding now reaches the maximum heating load of motor winding.If do not surpass the protection temperature of setting; return to the three-phase current that continues monitoring generator; if surpass the protection temperature of setting; carry out generator outage protection; then winding is carried out to megger test, and the protection value whether test result is less than setting is set to the Rule of judgment whether starter-generator is safeguarded protection.If test result is less than the protection value of setting, generator is safeguarded protection, if be not less than the three-phase current that the protection value of setting continues to monitor generator.The protection duration of described setting, the protection value of setting all need to determine according to the designing requirement of motor itself, can determine according to test.
In the present invention, by degree of unbalance protection, coordinate the protection process of utilization with excess temperature protection method and insulation protection method as shown in Figure 4.First the three-phase current to generator is monitored respectively; Then will carry out degree of unbalance analysis to three-phase current, and whether the ratio of any phase current and the average current of three-phase surpasses the protection value of setting and whether is set to the Rule of judgment of starter-generator stoppage protection.If any phase current is all no more than setting protection value with the ratio of the average current of three-phase, return to the three-phase current that continues monitoring generator; If any phase current surpasses setting protection value with the ratio of the average current of three-phase; whether whether the winding temperature that ratio of any phase current and the average current of three-phase is surpassed to this stage generator while setting protection value surpasses the protection temperature setting of setting is set to the Rule of judgment of starter-generator stoppage protection, and the protection temperature of described setting is the temperature of the heat load of now motor winding while reaching the maximum heating load of motor winding.If the winding temperature of generator does not surpass the protection temperature of setting, return to the three-phase current that continues monitoring generator; If the protection temperature that the winding temperature of generator surpass to be set, generator carries out stoppage protection, then winding is carried out to megger test, and the protection value whether test result is less than setting is set to the Rule of judgment whether starter-generator is safeguarded protection.If test result is less than the protection value of setting, generator is safeguarded protection, if be not less than the three-phase current that the protection value of setting continues to monitor generator.The protection value of described setting all needs to determine according to the designing requirement of motor itself, can determine according to test.
In the present invention, by excess temperature protection method, coordinate the protection process of utilization with insulation protection method as shown in Figure 5; first the winding temperature of generator is monitored; and whether winding temperature is surpassed to the protection temperature setting of setting whether be set to the Rule of judgment of starter-generator stoppage protection, the protection temperature of described setting is the temperature of the heat load of now motor winding while reaching the maximum heating load of motor winding.If winding temperature does not surpass the protection temperature of setting, return to the winding temperature that continues monitoring generator; If the protection temperature that winding temperature surpass to be set, generator carries out stoppage protection, then winding is carried out to megger test, and the protection value whether test result is less than setting is set to the Rule of judgment whether starter-generator is safeguarded protection.If test result is less than the protection value of setting, generator is safeguarded protection, if be not less than the winding temperature that the protection value of setting continues to monitor generator.
In the present invention, take over-voltage protection method to coordinate the protection process innovative measure using with insulation protection method, can be when carrying out overvoltage protection starter-generator stoppage protection to realize the present invention, according to the degree of injury of the insulating material of direct-drive permanent magnet wind turbine generator winding, select whether further starter-generator to safeguard the technique effect that protection is carried out more effective and more perfect protection to direct-drive permanent magnet wind turbine generator winding, thereby thoroughly broken away from the degree of injury that over-voltage protection method cannot judge the insulating material of direct-drive permanent magnet wind turbine generator winding, when the overvoltage number of times of appearance surpasses setting protection number of times or occurs that the total duration of overvoltage surpasses setting protection duration, can only to direct-drive permanent magnet wind turbine generator, carry out effect finite sum by this measure of starter-generator stoppage protection and protect incomplete technology drawback.
In the present invention, take over-current protection method to coordinate the protection process innovative measure using with excess temperature protection method and insulation protection method, whether whether to realize the present invention, can whether surpass 1.2 times of rated current according to any phase current but not surpass 2 times of rated current, cross flow/time length and surpass and set protection duration and winding temperature and surpass and set protection temperature, these three conditions are carried out the correct current overload that judges whether; And when carrying out overcurrent protection starter-generator stoppage protection; can, according to the degree of injury of the insulating material of direct-drive permanent magnet wind turbine generator winding, select whether further starter-generator to safeguard the technique effect that protection is carried out more effective and more perfect protection to direct-drive permanent magnet wind turbine generator winding.Thereby thoroughly broken away from over-current protection method and both cannot judge that whether the heat energy producing on direct-drive permanent magnet wind turbine generator winding really surpasses the rated heat input, rated heat load of self, also cannot judge the degree of injury of the insulating material of direct-drive permanent magnet wind turbine generator winding; When any phase current surpasses 1.2 times of rated current but does not surpass 2 times of rated current; need only flow/time length and surpassed setting protection duration; over-current protection method is just thought current overload, and over-current protection method can only carry out effect finite sum to direct-drive permanent magnet wind turbine generator by this measure of starter-generator stoppage protection and protects incomplete technology drawback.
In the present invention, take the innovative measure using that coordinates of degree of unbalance guard method and excess temperature protection method and insulation protection method, to realize, whether whether we are bright can surpass and set protection value and winding temperature and surpass and set protection temperature according to the ratio of any phase current and the average current of three-phase, and these two conditions are carried out the correct three-phase current unbalance that judges whether; And when carrying out degree of unbalance protection starter-generator stoppage protection; can, according to the degree of injury of the insulating material of direct-drive permanent magnet wind turbine generator winding, select whether further starter-generator to safeguard the technique effect that protection is carried out more effective and more perfect protection to direct-drive permanent magnet wind turbine generator winding.Thereby thoroughly broken away from degree of unbalance guard method and both cannot judge that whether the heat energy producing on direct-drive permanent magnet wind turbine generator winding really surpasses the rated heat input, rated heat load of self, also cannot judge the degree of injury of the insulating material of direct-drive permanent magnet wind turbine generator winding; As long as when the ratio of any phase current and the average current of three-phase will surpass setting protection value; three-phase current unbalance is just thought in degree of unbalance guard method, and degree of unbalance guard method can only be carried out effect finite sum to direct-drive permanent magnet wind turbine generator by this measure of starter-generator stoppage protection and protects incomplete technology drawback.
In the present invention, take the innovative measure using that coordinates of excess temperature protection method and insulation protection method; with realize we bright can be when carrying out overheat protector starter-generator stoppage protection; according to the degree of injury of the insulating material of direct-drive permanent magnet wind turbine generator winding, select whether further starter-generator to safeguard the technique effect that protection is carried out more effective and more perfect protection to direct-drive permanent magnet wind turbine generator winding.Thereby thoroughly broken away from the degree of injury that excess temperature protection method cannot judge the insulating material of direct-drive permanent magnet wind turbine generator winding; when winding temperature surpasses setting protection temperature, excess temperature protection method can only carry out effect finite sum to direct-drive permanent magnet wind turbine generator by this measure of starter-generator stoppage protection and protect incomplete technology drawback.
The present embodiment provides a kind of comprehensive method of protection for direct-drive permanent magnet wind turbine generator; as shown in Figure 1; comprise following Four processes, by over-voltage protection method, coordinate the protection process of using, the protection process that coordinates utilization by over-current protection method with excess temperature protection method and insulation protection method with insulation protection method, by degree of unbalance guard method, coordinate the protection process of using, the protection process that coordinates utilization by excess temperature protection method with insulation protection method with excess temperature protection method and insulation protection method.
As shown in Figure 2, for coordinate the protection process of using in the present embodiment with insulation protection method by over-voltage protection method, this process flow is as follows:
First, the three-phase voltage to generator is monitored respectively, and whether any phase voltage is surpassed to the Rule of judgment that 2.5 times of rated voltages are set to whether overvoltage;
Then, will be in setting cycle to the duration of overvoltage number of times and each overvoltage, add up, and whether whether overvoltage number of times surpass and set protection number of times and the total duration of overvoltage and surpass and set protection duration and whether be set to the Rule of judgment of starter-generator stoppage protection;
Finally, winding is carried out to megger test, and whether test result is less than and sets protection value and be set to the Rule of judgment whether starter-generator is safeguarded protection.
Be illustrated in figure 3 over-current protection method in the present embodiment and coordinate the protection process of using with excess temperature protection method and insulation protection method, this process flow is as follows:
First, the three-phase current to generator is monitored respectively, and whether any phase current is surpassed to 1.2 times of rated current whether be set to the Rule of judgment of overcurrent;
Then, will carry out the analysis of electric current instantaneous short-circuit to over-current phenomenon avoidance, and whether any phase current is surpassed to 2 times of rated current whether be set to the Rule of judgment of starter-generator stoppage protection;
Then, again over-current phenomenon avoidance is carried out to current overload analysis, and whether any phase current is surpassed to 1.2 times of rated current but do not surpass 2 times of rated current and cross flow/time length and surpass the winding temperature of setting protection duration and this stage generator and surpass to set and protect temperature setting whether to be set to the Rule of judgment of starter-generator stoppage protection;
Finally, winding is carried out to megger test, and whether test result is less than and sets protection value and be set to the Rule of judgment whether starter-generator is safeguarded protection.
Be illustrated in figure 4 degree of unbalance guard method in the present embodiment and coordinate the protection process of using with excess temperature protection method and insulation protection method, this process flow is as follows:
First, the three-phase current to generator is monitored respectively;
Then, to carry out degree of unbalance analysis to three-phase current, and whether the ratio of any phase current and the average current of three-phase is surpassed to the winding temperature of setting protection value, this stage generator whether surpass and set protection temperature whether the Rule of judgment of starter-generator stoppage protection is set;
Finally, winding is carried out to megger test, and whether test result is less than and sets protection value and be set to the Rule of judgment whether starter-generator is safeguarded protection.
Be illustrated in figure 5 excess temperature protection method of the present invention and coordinate the protection process of using with insulation protection method, this process flow is as follows:
First, the winding temperature of generator is monitored, and whether winding temperature is surpassed and set protection temperature setting and whether be set to the Rule of judgment of starter-generator stoppage protection;
Then, winding is carried out to megger test, and whether test result is less than and sets protection value and be set to the Rule of judgment whether starter-generator is safeguarded protection.
Four kinds of methods below synchronous use in the present embodiment: coordinate the protection process of using by over-voltage protection method with insulation protection method; Over-current protection method coordinates the protection process of using with excess temperature protection method and insulation protection method; Degree of unbalance guard method coordinates the protection process of using with excess temperature protection method and insulation protection method; Excess temperature protection method coordinates the protection process of using with the protection process of insulation protection method, above four protection processes are synchronously used.
The above embodiment is only the preferred embodiment for absolutely proving that the present invention lifts, and protection scope of the present invention is not limited to this.Being equal to that those skilled in the art do on basis of the present invention substitutes or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (5)
1. the comprehensive method of protection for direct-drive permanent magnet wind turbine generator, it is characterized in that, comprise following four processes of synchronously carrying out: by over-voltage protection method, coordinate the protection process of using with insulation protection method, by over-current protection method, coordinate the protection process of using with excess temperature protection method and insulation protection method, by degree of unbalance guard method, coordinate the protection process of using with excess temperature protection method and insulation protection method, and the protection process that coordinates utilization by excess temperature protection method with insulation protection method, when above any one protection process judgement need to be carried out generator maintenance protection, stop other protection processes and directly carry out generator maintenance protection.
2. the comprehensive method of protection for direct-drive permanent magnet wind turbine generator according to claim 1, it is characterized in that, the described protection process of using that coordinates with insulation protection method by over-voltage protection method specifically comprises: the three-phase voltage to generator is monitored respectively, judge the whether overvoltage of any phase voltage, as all not overvoltages of three-phase voltage, return to the three-phase voltage that continues monitoring generator; As any phase voltage overvoltage, in setting cycle, the duration of overvoltage number of times and each overvoltage is added up, and judge whether overvoltage number of times surpasses protection number of times and the total duration of overvoltage set and surpass the protection duration of setting, as all do not surpassed and return to the three-phase voltage that continues monitoring generator; As surpassing protection number of times or the total duration of overvoltage set, overvoltage number of times surpasses the protection duration of setting; generator carries out stoppage protection; then the winding of generator is carried out to megger test; and whether judgement is less than test result the protection value of setting; if test result is less than the protection value of setting; generator is safeguarded protection, if be not less than the protection value of setting, continues the three-phase voltage of monitoring generator.
3. the comprehensive method of protection for direct-drive permanent magnet wind turbine generator according to claim 1, it is characterized in that, the described protection process of using that coordinates with excess temperature protection method and insulation protection method by over-current protection method comprises: the three-phase current to generator is monitored respectively, judges whether overcurrent of any phase current, if three-phase current is overcurrent not all, return to the three-phase current that continues monitoring generator, if any phase current overcurrent, over-current phenomenon avoidance is carried out to the analysis of electric current instantaneous short-circuit, and judge that the maximum whether any one electric current surpasses rated current sets multiple, if any phase current surpass rated current maximum set multiple, carry out generator outage protection, if three-phase current all do not surpass rated current maximum set multiple, over-current phenomenon avoidance is carried out to current overload analysis, then carried out flow/time length statistics, and the crossing flow/time length and whether surpass the protection duration of setting of judgement statistics, if do not surpass the protection duration of setting, return to the three-phase current that continues monitoring generator, if surpass the protection duration of setting, whether the winding temperature that judges generator surpasses the protection temperature of setting, if do not surpass the protection temperature of setting, return to the three-phase current that continues monitoring generator, if surpass the protection temperature of setting, carry out generator outage protection, after generator carries out stoppage protection, winding is carried out to megger test, and judge whether test result is less than the protection value of setting, if test result is less than the protection value of setting, generator is safeguarded protection, if be not less than the protection value of setting, continue the three-phase current of monitoring generator.
4. the comprehensive method of protection for direct-drive permanent magnet wind turbine generator according to claim 1, it is characterized in that, the described protection process of using that coordinates with excess temperature protection method and insulation protection method by degree of unbalance guard method comprises: the three-phase current to generator is monitored respectively, then will carry out degree of unbalance analysis to three-phase current, and judge whether any phase current and the ratio of the average current of three-phase surpass the protection value of setting, if any phase current is all no more than setting protection value with the ratio of the average current of three-phase, return to the three-phase current that continues monitoring generator, if any phase current surpasses setting protection value with the ratio of the average current of three-phase, judge whether winding temperature surpasses the protection temperature of setting, if the winding temperature of generator does not surpass the protection temperature of setting, return to the three-phase current of continuation monitoring generator, if the winding temperature of generator surpasses the protection temperature of setting, generator carries out stoppage protection, then winding is carried out to megger test, and judges whether test result is less than the protection value setting of setting, if test result is less than the protection value of setting, generator is safeguarded protection, if be not less than the protection value of setting, continues the three-phase current of monitoring generator.
5. the comprehensive method of protection for direct-drive permanent magnet wind turbine generator according to claim 1, it is characterized in that, the described protection process of using that coordinates with insulation protection method by excess temperature protection method comprises: the winding temperature to generator is monitored, and judge whether winding temperature surpasses the protection temperature of setting, if winding temperature does not surpass the protection temperature of setting, return to the winding temperature that continues monitoring generator; If winding temperature surpasses the protection temperature of setting; carry out generator and carry out stoppage protection; then winding is carried out to megger test; and judge whether test result is less than the protection value of setting; if test result is less than the protection value of setting; generator is safeguarded protection, if be not less than the protection value of setting, continues the winding temperature of monitoring generator.
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