CN112684287A - Method and device for judging short circuit fault direction of outgoing line of direct-drive wind power plant - Google Patents
Method and device for judging short circuit fault direction of outgoing line of direct-drive wind power plant Download PDFInfo
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Abstract
The invention provides a method for judging the short-circuit fault direction of a direct-drive wind power plant outgoing line, which is used for connecting a direct-drive wind power plant with a system side power supply on the direct-drive wind power plant outgoing line and is provided with a direction element. The method comprises the following steps: when a short circuit fault of a transmission line of a direct-drive wind power plant occurs, acquiring a negative sequence voltage component and a negative sequence current component on a directional element; and comparing the amplitude of the negative sequence voltage component with a preset negative sequence voltage setting value to determine the short-circuit fault type of the direct-drive wind power plant sending line, comparing the amplitude of the negative sequence current component with the preset negative sequence current setting value to obtain the fault direction of the determined short-circuit fault type, and further combining the determined short-circuit fault type with the corresponding fault direction as a final result to be output. By implementing the method, the problem that the traditional directional element cannot be suitable for judging the direction of the short-circuit fault of the output line of the direct-drive wind power plant is solved.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a method and a device for judging the short-circuit fault direction of a transmission line of a direct-drive wind power plant.
Background
The direct-drive wind turbine generator set has the characteristics of high reliability (no need of a gear box), strong low-voltage ride through capability and the like, so that the direct-drive wind turbine generator set is widely applied to an established wind power plant.
Research shows that when a short circuit fault occurs on a transmission line of a direct-drive wind power plant, external positive sequence equivalent impedance on the wind power plant side is unstable, and the positive sequence equivalent impedance is not equal to the negative sequence equivalent impedance, so that the difference between a positive current branch coefficient and a negative current branch coefficient on the wind power plant side is large. However, the principle of the conventional directional element for determining the short-circuit fault direction is based on the way that the positive-sequence current branch coefficient is approximately equal to the negative-sequence current branch coefficient, so that the conventional directional element is not suitable for determining the short-circuit fault direction of the outgoing line of the direct-drive wind power plant. Therefore, a new method for judging the direction of the short-circuit fault of the outgoing line of the direct-drive wind power plant is needed.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method and a device for judging the direction of a short-circuit fault of a transmission line of a direct-drive wind power plant, and solve the problem that a traditional direction element cannot be suitable for judging the direction of the short-circuit fault of the transmission line of the direct-drive wind power plant.
In order to solve the technical problem, the embodiment of the invention provides a method for judging the short-circuit fault direction of a transmission line of a direct-drive wind power plant, which is used for the transmission line of the direct-drive wind power plant; the direct-drive wind power plant feeding line connects the direct-drive wind power plant with a system side power supply together, and a direction element is arranged on the direct-drive wind power plant feeding line; wherein the method comprises the steps of:
s1, when a short-circuit fault occurs on a transmission line of the direct-drive wind power plant, acquiring a negative sequence voltage component and a negative sequence current component on the directional element;
s2, comparing the amplitude of the negative sequence voltage component with a preset negative sequence voltage setting value to determine the short-circuit fault type of the direct-drive wind power plant sending line, comparing the amplitude of the negative sequence current component with the preset negative sequence current setting value to obtain the fault direction of the determined short-circuit fault type, and further combining the determined short-circuit fault type with the corresponding fault direction to serve as a final result to be output; the short-circuit fault type is a symmetric short-circuit fault or an asymmetric short-circuit fault; the fault direction is either forward or reverse.
Wherein, the step S2 specifically includes:
and if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out wire is a symmetric short-circuit fault, further obtaining that the corresponding fault direction is positive when the amplitude of the negative sequence current component is smaller than or equal to the preset negative sequence current setting value, and outputting the positive symmetric short-circuit fault of the direct-drive wind power plant sending-out wire as a final result.
Wherein the step S2 further includes:
and if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out wire is a symmetrical short-circuit fault, further obtaining that the corresponding fault direction is reverse when the amplitude of the negative sequence current component is larger than the preset negative sequence current setting value, and outputting the reverse symmetrical short-circuit fault of the direct-drive wind power plant sending-out wire as a final result.
Wherein the step S2 further includes:
if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, the fact that the type of the short-circuit fault of the direct-drive wind power plant sending line is an asymmetric short-circuit fault is obtained, further, when the amplitude of the negative sequence current component is less than or equal to the preset negative sequence current setting value, the fact that the corresponding fault direction is positive is obtained, and the fact that the positive asymmetric short-circuit fault occurs on the direct-drive wind power plant sending line is output as a final result.
Wherein the step S2 further includes:
if the amplitude of the negative sequence voltage component is larger than or equal to the preset negative sequence voltage setting value, the fact that the type of the short-circuit fault of the direct-drive wind power plant sending line is an asymmetric short-circuit fault is obtained, further when the amplitude of the negative sequence current component is larger than the preset negative sequence current setting value, the fact that the corresponding fault direction is reverse is obtained, and the fact that the reverse asymmetric short-circuit fault occurs in the direct-drive wind power plant sending line is used as a final result to be output.
Wherein, before the step S1, the method further comprises the following steps:
detecting the action condition of a protection starting element in a preset protection device, and determining whether a short-circuit fault occurs on a transmission line of the direct-drive wind power plant according to a detection result; the preset protection device is arranged on the direct-drive wind power plant output line and is close to one side of the direct-drive wind power plant.
The specific step of determining whether the short-circuit fault occurs on the output line of the direct-drive wind power plant according to the detection result comprises the following steps:
if the fact that a protection starting element in a preset protection device acts is detected, determining that a short-circuit fault occurs to a transmission line of the direct-drive wind power plant; and if the situation that the protection starting element in the preset protection device does not act is detected, determining that the short-circuit fault does not occur in the direct-drive wind power plant output line.
The embodiment of the invention also provides a device for judging the short-circuit fault direction of the outgoing line of the direct-drive wind power plant, which is used for the outgoing line of the direct-drive wind power plant; the direct-drive wind power plant feeding line connects the direct-drive wind power plant with a system side power supply together, and a direction element is arranged on the direct-drive wind power plant feeding line; wherein the apparatus comprises:
the acquisition unit is used for acquiring a negative sequence voltage component and a negative sequence current component on the directional element when a short-circuit fault occurs on a transmission line of the direct-drive wind power plant;
the identification unit is used for comparing the amplitude of the negative sequence voltage component with a preset negative sequence voltage setting value to determine the short-circuit fault type of the direct-drive wind power plant sending line, comparing the amplitude of the negative sequence current component with the preset negative sequence current setting value to obtain the fault direction of the determined short-circuit fault type, and further combining the determined short-circuit fault type with the corresponding fault direction to serve as a final result to be output; the short-circuit fault type is a symmetric short-circuit fault or an asymmetric short-circuit fault; the fault direction is either forward or reverse.
Wherein the identification unit includes:
the first identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out line is a symmetric short-circuit fault if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is a positive direction when the amplitude of the negative sequence current component is smaller than or equal to the preset negative sequence current setting value, and outputting the positive symmetric short-circuit fault of the direct-drive wind power plant sending-out line as a final result;
the second identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending line is a symmetric short-circuit fault if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is reverse when the amplitude of the negative sequence current component is larger than the preset negative sequence current setting value, and outputting the reverse symmetric short-circuit fault of the direct-drive wind power plant sending line as a final result;
the third identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out line is an asymmetric short-circuit fault if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is a positive direction when the amplitude of the negative sequence current component is less than or equal to the preset negative sequence current setting value, and outputting the positive asymmetric short-circuit fault of the direct-drive wind power plant sending-out line as a final result;
and the fourth identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out line is an asymmetric short-circuit fault if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is reverse when the amplitude of the negative sequence current component is greater than the preset negative sequence current setting value, and outputting the reverse asymmetric short-circuit fault of the direct-drive wind power plant sending-out line as a final result.
Wherein the apparatus further comprises:
the detection unit is used for detecting the action condition of a protection starting element in a preset protection device and determining whether a short-circuit fault occurs on a transmission line of the direct-drive wind power plant or not according to a detection result; the preset protection device is arranged on the direct-drive wind power plant output line and is close to one side of the direct-drive wind power plant.
The embodiment of the invention has the following beneficial effects:
according to the invention, when the output line of the direct-drive wind power plant has a short-circuit fault, the amplitude of the negative sequence voltage component on the directional element is compared with the corresponding preset negative sequence voltage setting value, and the amplitude of the negative sequence current component is compared with the corresponding preset negative sequence current setting value, so that the type of the short-circuit fault and the fault direction thereof can be rapidly and accurately obtained, and the problem that the traditional directional element cannot be suitable for judging the output line short-circuit fault direction of the direct-drive wind power plant is solved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a flowchart of a method for judging a short-circuit fault direction of a transmission line of a direct-drive wind power plant according to an embodiment of the present invention;
fig. 2 is an equivalent model diagram of a direct-drive wind power plant outgoing line fault in an application scenario of the method for determining a direct-drive wind power plant outgoing line short-circuit fault direction according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a device for judging a short-circuit fault direction of a transmission line of a direct-drive wind power plant according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the method for judging the short-circuit fault direction of the outgoing line of the direct-drive wind farm in the embodiment of the present invention is used for the outgoing line (as shown in fig. 2) of the direct-drive wind farm; in fig. 2, a direct-drive wind farm delivery line L connects a direct-drive wind farm PMSG with a system-side power supply ESConnected together and provided with a direction element P; at this time, the fault points F1 and F2 are defined to be located in the forward and reverse directions of the directional element P, respectively, to reflect the fault sideTo, i.e. with the direction element P as reference point and the forward fault towards the system-side supply ESThe fault occurred, the reverse fault is a fault occurred towards the direct drive wind farm PMSG.
At this time, the method for judging the short-circuit fault direction of the outgoing line of the direct-drive wind power plant in the embodiment of the invention specifically comprises the following steps:
s1, when a short-circuit fault occurs on a transmission line of the direct-drive wind power plant, acquiring a negative sequence voltage component and a negative sequence current component on the directional element;
the method comprises the specific processes that the action condition of a protection starting element in a preset protection device is detected, and whether a short-circuit fault occurs to a direct-drive wind power plant sending-out line L is determined according to the detection result; the preset protection device (not shown) is arranged on the output line of the direct-drive wind power plant and is close to one side of the direct-drive wind power plant.
If the fact that a protection starting element in a preset protection device acts is detected, determining that a direct-drive wind power plant output line L has a short-circuit fault; and if the situation that the protection starting element in the preset protection device does not act is detected, determining that the short-circuit fault does not occur in the direct-drive wind power plant output line L.
Through a voltage transformer and a current transformer, when a direct-drive wind power plant output line L has a short-circuit fault, a negative sequence voltage component and a negative sequence current component on a directional element P are respectively collected. It should be noted that the negative sequence voltage and negative sequence current that would normally be generated by the system due to load asymmetry or system parameter asymmetry need to be avoided.
S2, comparing the amplitude of the negative sequence voltage component with a preset negative sequence voltage setting value to determine the short-circuit fault type of the direct-drive wind power plant sending line, comparing the amplitude of the negative sequence current component with the preset negative sequence current setting value to obtain the fault direction of the determined short-circuit fault type, and further combining the determined short-circuit fault type with the corresponding fault direction to serve as a final result to be output; the short-circuit fault type is a symmetric short-circuit fault or an asymmetric short-circuit fault; the fault direction is either forward or reverse.
The specific process is that two conditions of symmetric short-circuit fault and asymmetric short-circuit fault can occur due to short-circuit fault, and two conditions of forward direction and reverse direction can also occur in the fault direction. Thus. The method can be specifically refined into four cases, and the process is as follows:
(1) forward symmetric short circuit fault: if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, the fact that the type of the short-circuit fault of the direct-drive wind power plant output line L is a symmetric short-circuit fault is obtained, further, when the amplitude of the negative sequence current component is smaller than or equal to the preset negative sequence current setting value, the fact that the corresponding fault direction is a positive direction (namely point F1 in fig. 2) is obtained, and the fact that the direct-drive wind power plant output line L has the positive symmetric short-circuit fault is output as a final result, namely the fact that the positive symmetric short-circuit fault is output
Wherein the content of the first and second substances,
represents the magnitude of the negative sequence voltage component flowing through the directional element P after a fault;
representing a preset negative sequence voltage setting value;
represents the magnitude of the negative-sequence current component flowing through the directional element P after a fault;
and representing a preset negative sequence current setting value.
(2) Reverse symmetric short circuit failure: if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, the fact that the type of the short-circuit fault of the direct-drive wind power plant output line L is a symmetric short-circuit fault is obtained, and further when the amplitude of the negative sequence current component is larger than the preset negative sequence current setting value, the fact that the corresponding fault direction is reverse (namely point F2 in figure 2) is obtained, and the fact that the reverse symmetric short-circuit fault occurs on the direct-drive wind power plant output line L is output as a final result, namely the fact that the reverse symmetric short-circuit fault occurs on the direct-drive
(3) Forward asymmetric short circuit fault: if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, the fact that the type of the short-circuit fault of the direct-drive wind power plant output line L is an asymmetric short-circuit fault is obtained, further, when the amplitude of the negative sequence current component is less than or equal to the preset negative sequence current setting value, the fact that the corresponding fault direction is positive (namely point F1 in fig. 2) is obtained, and the fact that the positive asymmetric short-circuit fault of the direct-drive wind power plant output line L occurs is output as a final result, namely the fact that the positive asymmetric short-circuit fault occurs
(4) Reverse asymmetric short circuit failure: if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, the fact that the type of the short-circuit fault of the direct-drive wind power plant output line L is an asymmetric short-circuit fault is obtained, further, when the amplitude of the negative sequence current component is greater than the preset negative sequence current setting value, the fact that the corresponding fault direction is reverse (namely, point F2 in fig. 2) is obtained, the fact that the reverse asymmetric short-circuit fault occurs on the direct-drive wind power plant output line L is output as a final result, namely the fact that the reverse asymmetric short-circuit fault occurs on the direct
It should be noted that, in the case of a forward fault, the fault current I flowing through the directional element Pf-F1Provided by a direct drive wind farm PMSG on the P-back side. Because a direct-drive wind turbine generator grid-side converter in a direct-drive wind power plant PMSG adopts a control strategy of inhibiting the negative sequence current of a power grid, and the delay of the response of a control link is considered, the fault current I provided by the wind power plant side is obtained after the transient process of a cyclef-F1Almost does not contain a negative sequence component, namely only needs to judge that the current is less than a preset negative sequence current setting value
And (4) finishing.
In the event of a reverse fault, a fault current I flowing through the directional element Pf-F2System power supply E opposite to PSProvided is a method.Due to the system side power supply ESSynchronous generator is used as the main part, and the fault is an asymmetric fault, so that the fault current If-F2The negative sequence current component with a certain amplitude is contained, namely, only the setting value of the negative sequence current which is more than or equal to the preset value is judged
And (4) finishing.
As shown in fig. 3, the device for determining the short-circuit fault direction of the outgoing line of the direct-drive wind farm provided in the embodiment of the present invention is used for the outgoing line (as shown in fig. 2) of the direct-drive wind farm; a direct-drive wind power plant feeding line connects the direct-drive wind power plant with a system side power supply together, and a direction element is arranged on the direct-drive wind power plant feeding line; wherein the apparatus comprises:
the obtaining unit 110 is configured to obtain a negative sequence voltage component and a negative sequence current component on the directional element when a short-circuit fault occurs on a transmission line of the direct-drive wind farm;
the identification unit 120 is configured to compare the amplitude of the negative sequence voltage component with a preset negative sequence voltage setting value to determine a short-circuit fault type of a direct-drive wind power plant transmission line, compare the amplitude of the negative sequence current component with the preset negative sequence current setting value to obtain a fault direction of the determined short-circuit fault type, and further combine the determined short-circuit fault type with a corresponding fault direction thereof to output as a final result; the short-circuit fault type is a symmetric short-circuit fault or an asymmetric short-circuit fault; the fault direction is either forward or reverse.
Wherein the identification unit includes:
the first identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out line is a symmetric short-circuit fault if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is a positive direction when the amplitude of the negative sequence current component is smaller than or equal to the preset negative sequence current setting value, and outputting the positive symmetric short-circuit fault of the direct-drive wind power plant sending-out line as a final result;
the second identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending line is a symmetric short-circuit fault if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is reverse when the amplitude of the negative sequence current component is larger than the preset negative sequence current setting value, and outputting the reverse symmetric short-circuit fault of the direct-drive wind power plant sending line as a final result;
the third identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out line is an asymmetric short-circuit fault if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is a positive direction when the amplitude of the negative sequence current component is less than or equal to the preset negative sequence current setting value, and outputting the positive asymmetric short-circuit fault of the direct-drive wind power plant sending-out line as a final result;
and the fourth identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out line is an asymmetric short-circuit fault if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is reverse when the amplitude of the negative sequence current component is greater than the preset negative sequence current setting value, and outputting the reverse asymmetric short-circuit fault of the direct-drive wind power plant sending-out line as a final result.
Wherein the apparatus further comprises:
the detection unit is used for detecting the action condition of a protection starting element in a preset protection device and determining whether a short-circuit fault occurs on a transmission line of the direct-drive wind power plant or not according to a detection result; the preset protection device is arranged on the direct-drive wind power plant output line and is close to one side of the direct-drive wind power plant.
The embodiment of the invention has the following beneficial effects:
according to the invention, when the output line of the direct-drive wind power plant has a short-circuit fault, the amplitude of the negative sequence voltage component on the directional element is compared with the corresponding preset negative sequence voltage setting value, and the amplitude of the negative sequence current component is compared with the corresponding preset negative sequence current setting value, so that the type of the short-circuit fault and the fault direction thereof can be rapidly and accurately obtained, and the problem that the traditional directional element cannot be suitable for judging the output line short-circuit fault direction of the direct-drive wind power plant is solved.
It should be noted that, in the above device embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be achieved; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A method for judging the short-circuit fault direction of a direct-drive wind power plant outgoing line is used for the direct-drive wind power plant outgoing line; the direct-drive wind power plant feeding line connects the direct-drive wind power plant with a system side power supply together, and a direction element is arranged on the direct-drive wind power plant feeding line; characterized in that the method comprises the following steps:
s1, when a short-circuit fault occurs on a transmission line of the direct-drive wind power plant, acquiring a negative sequence voltage component and a negative sequence current component on the directional element;
s2, comparing the amplitude of the negative sequence voltage component with a preset negative sequence voltage setting value to determine the short-circuit fault type of the direct-drive wind power plant sending line, comparing the amplitude of the negative sequence current component with the preset negative sequence current setting value to obtain the fault direction of the determined short-circuit fault type, and further combining the determined short-circuit fault type with the corresponding fault direction to serve as a final result to be output; the short-circuit fault type is a symmetric short-circuit fault or an asymmetric short-circuit fault; the fault direction is either forward or reverse.
2. The method for judging the short-circuit fault direction of the outgoing line of the direct-drive wind power plant according to claim 1, wherein the step S2 specifically comprises the following steps:
and if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out wire is a symmetric short-circuit fault, further obtaining that the corresponding fault direction is positive when the amplitude of the negative sequence current component is smaller than or equal to the preset negative sequence current setting value, and outputting the positive symmetric short-circuit fault of the direct-drive wind power plant sending-out wire as a final result.
3. The method for judging the short-circuit fault direction of the outgoing line of the direct-drive wind power plant according to claim 1, wherein the step S2 further comprises the following steps:
and if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out wire is a symmetrical short-circuit fault, further obtaining that the corresponding fault direction is reverse when the amplitude of the negative sequence current component is larger than the preset negative sequence current setting value, and outputting the reverse symmetrical short-circuit fault of the direct-drive wind power plant sending-out wire as a final result.
4. The method for judging the short-circuit fault direction of the outgoing line of the direct-drive wind power plant according to claim 1, wherein the step S2 further comprises the following steps:
if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, the fact that the type of the short-circuit fault of the direct-drive wind power plant sending line is an asymmetric short-circuit fault is obtained, further, when the amplitude of the negative sequence current component is less than or equal to the preset negative sequence current setting value, the fact that the corresponding fault direction is positive is obtained, and the fact that the positive asymmetric short-circuit fault occurs on the direct-drive wind power plant sending line is output as a final result.
5. The method for judging the short-circuit fault direction of the outgoing line of the direct-drive wind power plant according to claim 1, wherein the step S2 further comprises the following steps:
if the amplitude of the negative sequence voltage component is larger than or equal to the preset negative sequence voltage setting value, the fact that the type of the short-circuit fault of the direct-drive wind power plant sending line is an asymmetric short-circuit fault is obtained, further when the amplitude of the negative sequence current component is larger than the preset negative sequence current setting value, the fact that the corresponding fault direction is reverse is obtained, and the fact that the reverse asymmetric short-circuit fault occurs in the direct-drive wind power plant sending line is used as a final result to be output.
6. The method for judging the short-circuit fault direction of the outgoing line of the direct-drive wind farm according to claim 1, characterized by further comprising the following steps before the step S1:
detecting the action condition of a protection starting element in a preset protection device, and determining whether a short-circuit fault occurs on a transmission line of the direct-drive wind power plant according to a detection result; the preset protection device is arranged on the direct-drive wind power plant output line and is close to one side of the direct-drive wind power plant.
7. The method for judging the short-circuit fault direction of the direct-drive wind power plant outgoing line according to claim 6, wherein the specific step of determining whether the direct-drive wind power plant outgoing line has the short-circuit fault according to the detection result comprises the following steps:
if the fact that a protection starting element in a preset protection device acts is detected, determining that a short-circuit fault occurs to a transmission line of the direct-drive wind power plant; and if the situation that the protection starting element in the preset protection device does not act is detected, determining that the short-circuit fault does not occur in the direct-drive wind power plant output line.
8. A judging device for a direct-drive wind power plant outgoing line short-circuit fault direction is used for a direct-drive wind power plant outgoing line; the direct-drive wind power plant feeding line connects the direct-drive wind power plant with a system side power supply together, and a direction element is arranged on the direct-drive wind power plant feeding line; characterized in that the device comprises:
the acquisition unit is used for acquiring a negative sequence voltage component and a negative sequence current component on the directional element when a short-circuit fault occurs on a transmission line of the direct-drive wind power plant;
the identification unit is used for comparing the amplitude of the negative sequence voltage component with a preset negative sequence voltage setting value to determine the short-circuit fault type of the direct-drive wind power plant sending line, comparing the amplitude of the negative sequence current component with the preset negative sequence current setting value to obtain the fault direction of the determined short-circuit fault type, and further combining the determined short-circuit fault type with the corresponding fault direction to serve as a final result to be output; the short-circuit fault type is a symmetric short-circuit fault or an asymmetric short-circuit fault; the fault direction is either forward or reverse.
9. The device for judging the short-circuit fault direction of the outgoing line of the direct-drive wind power plant according to claim 8, wherein the identification unit comprises:
the first identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out line is a symmetric short-circuit fault if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is a positive direction when the amplitude of the negative sequence current component is smaller than or equal to the preset negative sequence current setting value, and outputting the positive symmetric short-circuit fault of the direct-drive wind power plant sending-out line as a final result;
the second identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending line is a symmetric short-circuit fault if the amplitude of the negative sequence voltage component is smaller than the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is reverse when the amplitude of the negative sequence current component is larger than the preset negative sequence current setting value, and outputting the reverse symmetric short-circuit fault of the direct-drive wind power plant sending line as a final result;
the third identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out line is an asymmetric short-circuit fault if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is a positive direction when the amplitude of the negative sequence current component is less than or equal to the preset negative sequence current setting value, and outputting the positive asymmetric short-circuit fault of the direct-drive wind power plant sending-out line as a final result;
and the fourth identification module is used for obtaining that the type of the short-circuit fault of the direct-drive wind power plant sending-out line is an asymmetric short-circuit fault if the amplitude of the negative sequence voltage component is greater than or equal to the preset negative sequence voltage setting value, further obtaining that the corresponding fault direction is reverse when the amplitude of the negative sequence current component is greater than the preset negative sequence current setting value, and outputting the reverse asymmetric short-circuit fault of the direct-drive wind power plant sending-out line as a final result.
10. The device for judging the short-circuit fault direction of the outgoing line of the direct-drive wind power plant according to claim 8, characterized by further comprising:
the detection unit is used for detecting the action condition of a protection starting element in a preset protection device and determining whether a short-circuit fault occurs on a transmission line of the direct-drive wind power plant or not according to a detection result; the preset protection device is arranged on the direct-drive wind power plant output line and is close to one side of the direct-drive wind power plant.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116908611A (en) * | 2022-11-18 | 2023-10-20 | 天津大学 | Method and device for identifying and setting fault direction of power grid based on high-proportion distributed power supply and storage medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253308A (en) * | 2011-04-29 | 2011-11-23 | 上海磁浮交通发展有限公司 | Method for determining asymmetric short circuit fault of long stator according to negative sequence voltage |
| CN105785229A (en) * | 2016-05-05 | 2016-07-20 | 国网天津市电力公司 | Fault identification method for isolated neutral system |
| CN108333474A (en) * | 2018-01-25 | 2018-07-27 | 清华大学 | A kind of the delay method of discrimination and system of the fault direction of bus circuit |
| CN108614189A (en) * | 2018-05-10 | 2018-10-02 | 国网重庆市电力公司电力科学研究院 | Send out line three phase short circuit fault direction determination process and directional element in double-fed fan motor field |
| CN109449900A (en) * | 2019-01-15 | 2019-03-08 | 华北电力大学 | A kind of longitudinal protection method based on current amplitude ratio |
| CN109581085A (en) * | 2018-12-05 | 2019-04-05 | 广东电网有限责任公司 | A kind of collection electric wire and fault of interconnected transmission line discriminating direction method |
-
2020
- 2020-12-11 CN CN202011440244.3A patent/CN112684287B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253308A (en) * | 2011-04-29 | 2011-11-23 | 上海磁浮交通发展有限公司 | Method for determining asymmetric short circuit fault of long stator according to negative sequence voltage |
| CN105785229A (en) * | 2016-05-05 | 2016-07-20 | 国网天津市电力公司 | Fault identification method for isolated neutral system |
| CN108333474A (en) * | 2018-01-25 | 2018-07-27 | 清华大学 | A kind of the delay method of discrimination and system of the fault direction of bus circuit |
| CN108614189A (en) * | 2018-05-10 | 2018-10-02 | 国网重庆市电力公司电力科学研究院 | Send out line three phase short circuit fault direction determination process and directional element in double-fed fan motor field |
| CN109581085A (en) * | 2018-12-05 | 2019-04-05 | 广东电网有限责任公司 | A kind of collection electric wire and fault of interconnected transmission line discriminating direction method |
| CN109449900A (en) * | 2019-01-15 | 2019-03-08 | 华北电力大学 | A kind of longitudinal protection method based on current amplitude ratio |
Non-Patent Citations (3)
| Title |
|---|
| 中国煤炭教育协会职业教育教材编审委员会: "《综采电气维修技术》", 30 August 2008, 煤炭工业出版社 * |
| 刘玮 等: "适用于逆变型电源接入的故障方向判别新方法", 《电力自动化设备》 * |
| 张滨生: "《变电运行与检修1000问》", 31 July 2003, 中国电力出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116908611A (en) * | 2022-11-18 | 2023-10-20 | 天津大学 | Method and device for identifying and setting fault direction of power grid based on high-proportion distributed power supply and storage medium |
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