CN114460502A - Power electronic equipment and detection device and detection method for abnormal connection of alternating current side of power electronic equipment - Google Patents
Power electronic equipment and detection device and detection method for abnormal connection of alternating current side of power electronic equipment Download PDFInfo
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- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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Abstract
The application provides a power electronic device and a detection method for abnormal connection of an alternating current side of the power electronic device. In the detection method, each phase output in the alternating current side is connected with at least two output cables through a wiring device, and the output cables are connected with wiring terminals in the wiring device in a one-to-one correspondence mode. The method for detecting the connection abnormality of the alternating current side of the power electronic equipment can detect whether the connection abnormality of the alternating current side is caused by the fact that the total external output impedance of at least one phase of the alternating current side of the power electronic equipment is changed due to the fact that the connection abnormality of the alternating current side of the power electronic equipment is caused, and further the unbalance degree of the alternating current side of the power electronic equipment during external output is caused.
Description
Technical Field
The invention relates to the technical field of automatic detection, in particular to a power electronic device and a detection method for abnormal connection of an alternating current side of the power electronic device.
Background
At present, as the voltage level of power electronic equipment is gradually increased, the wire diameter required by an output cable at the alternating current side of the power electronic equipment is also gradually increased; because the sectional area of the cable on the market at present cannot meet the increasing demand, a plurality of cables can be used in parallel to meet the demand.
However, a new power problem is also brought about, that is, there is a connection hidden trouble on the ac side, specifically: when one or more cables are not reliably connected, or when one or more cables are short-circuited, part of the terminals or part of the cables may generate heat seriously.
Therefore, how to detect whether the connection abnormality of the ac side is present is an urgent technical problem to be solved.
Disclosure of Invention
In view of the above, the present invention provides a power electronic device, and a detection apparatus and a detection method for detecting connection abnormality of an ac side thereof, so as to detect whether the ac side is connected abnormally.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a first aspect of the present application provides a method for detecting connection abnormality at an ac side of a power electronic device, where each phase output at the ac side is connected to at least two output cables through a wiring device, and the output cables are connected to wiring terminals in the wiring device, which correspond to one another; the detection method comprises the following steps:
s110, detecting the current and/or the temperature of the wiring terminal and/or the output cable in real time;
s120, determining the unbalance degree of the alternating current side during external output according to the detection result;
s130, judging whether the unbalance degree exceeds a first preset value or not;
if the unbalance degree exceeds the first preset value, executing step S140;
and S140, judging that the connection on the alternating current side is abnormal.
Optionally, after step S140 is executed, the method further includes:
s150, judging whether the unbalance degree exceeds a second preset value or not;
if the unbalance degree does not exceed the second preset value, executing step S160;
and S160, controlling the derating operation of the power electronic equipment.
Optionally, if the imbalance degree exceeds the second preset value, the following steps are performed: the following steps are carried out:
and S170, controlling the power electronic equipment to stop running.
Optionally, while executing step S140, the method further includes:
and S180, reporting the connection abnormity of the alternating current side.
Optionally, the three output cables respectively connected with the three-phase output are in a group; step S110, including at least one of:
detecting the sum of the currents of the output cables in any one group;
detecting the sum of the currents of all bus bars in the wiring device;
detecting the temperature of each wiring terminal connected with each output cable in at least one group in the wiring device;
and respectively detecting the current of each output cable in at least one group.
Optionally, when the detection result is a sum of currents of each output cable in any group, or a sum of currents of each bus bar in the wiring device, the step S120 includes:
the detected current is used to characterize the degree of imbalance.
Optionally, when the detection result is the temperature of each connection terminal in the connection device respectively connected to each output cable in at least one group, or the current of each output cable in at least one group, step S120 includes:
determining and characterizing the unbalance degree by the difference between the maximum temperature and the minimum temperature in all the detected temperatures; or,
the difference between the maximum current and the minimum current is determined and used to characterize the degree of imbalance among all the currents detected.
Optionally, when the detection result is the current of each output cable in all the groups, step S120 includes:
determining the current output by each phase in the alternating current side according to all detected currents;
and comparing the current output by each phase at the alternating current side with the current input to each phase at the alternating current side in the power electronic equipment, and representing the unbalance degree according to the comparison result.
Optionally, when the detection result is the temperature of each connection terminal in the connection device respectively connected to each output cable in at least one group, or the current of each output cable in at least one group, step S120 includes:
determining the difference value between the maximum temperature and the minimum temperature in each phase in the detected temperatures of each wiring terminal connected with each phase output of the alternating current side;
of the differences within the phases, the greatest difference is determined and used to characterize the degree of imbalance.
The second aspect of the present application provides a detection apparatus for detecting connection abnormality on an ac side of a power electronic device, including: a detection module and a controller; wherein:
the detection module is used for executing step S110 in the method for detecting an ac side connection abnormality of a power electronic device according to any one of the first aspect of the present application;
the controller is connected with the detection module and is used for executing other steps except the step S110 in the detection method of the abnormal connection of the alternating current side of the power electronic equipment.
Optionally, when the detecting module is configured to detect a sum of currents in any group of output cables, or a sum of currents of bus bars in the wiring device, the detecting module includes: a current collection device; wherein:
the input end of the current acquisition device is sleeved on each bus bar or the corresponding group of the output cables, and the output end of the current acquisition device is connected with the controller.
Optionally, when the detection module is configured to detect each current in at least one group of output cables, the detection module includes: at least three current collection devices;
the input end of each current acquisition device is respectively sleeved on the corresponding output cable, and the output end of each current acquisition device is respectively connected with the controller.
Optionally, the current collecting device includes: mutual inductor or be provided with the magnetic ring of first temperature acquisition device.
Optionally, when the detecting module is configured to detect temperatures of the connection terminals respectively connected to at least one group of output cables in the connection device, the detecting module includes: at least three second temperature acquisition devices; wherein:
the collecting end of each second temperature collecting device is respectively arranged at the connecting part of each wiring terminal connected with at least one group of output cables in the wiring device and the corresponding bus bar;
and the output end of the second temperature acquisition device is connected with the controller.
A third aspect of the present application provides a power electronic device, comprising: a converter, a detection device for detecting an abnormal connection on the ac side of a power electronic device according to any one of the second aspect of the present application; wherein:
at least one side of the conversion device is an alternating current side, the alternating current side of the conversion device is connected with the alternating current side of the power electronic equipment, and each phase output of the alternating current side of the power electronic equipment is connected with at least two output cables through a wiring device;
the detection device is arranged on the alternating current side.
According to the technical scheme, the invention provides the method for detecting the abnormal connection of the alternating current side of the power electronic equipment, each phase output in the alternating current side is connected with at least two output cables through the wiring device, and the output cables are connected with the wiring terminals in the wiring device in one-to-one correspondence. According to the detection method, the current and/or the temperature of the wiring terminal and/or the output cable are/is detected in real time, the unbalance degree of the alternating current side of the power electronic equipment during the outward output is determined according to the detection result, and if the unbalance degree of the alternating current side of the power electronic equipment during the outward output exceeds a first preset value, the connection abnormality of the alternating current side of the power electronic equipment is judged. The method for detecting the connection abnormality of the alternating current side of the power electronic equipment can detect whether the connection abnormality of the alternating current side is caused by the fact that the total external output impedance of at least one phase of the alternating current side of the power electronic equipment is changed due to the fact that the connection abnormality of the alternating current side of the power electronic equipment is caused, and further the unbalance degree of the alternating current side of the power electronic equipment during external output is caused.
Drawings
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 described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flowchart of an embodiment of a method for detecting an abnormal connection on an ac side of a power electronic device according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a structure of a wiring device on the AC side of a power electronic device;
fig. 3 is a schematic flowchart of another implementation of a method for detecting an abnormal connection on an ac side of a power electronic device according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a location where the instrument transformer 100 is disposed on the wiring lug of FIG. 2;
FIG. 5 is a schematic view of another location where the instrument transformer 100 is disposed on the wiring lug shown in FIG. 2;
FIG. 6 is a schematic view of another location where the instrument transformer 100 is disposed on the wiring lug shown in FIG. 2;
FIG. 7 is a schematic view of a position of the magnetic ring 200 disposed on the wiring device shown in FIG. 2;
FIG. 8 is a schematic view of a magnetic ring 200 disposed in another position on the wiring lug of FIG. 2;
FIG. 9 is a schematic view of a magnetic ring 200 disposed in yet another position on the wiring lug of FIG. 2;
fig. 10 is a schematic view illustrating a position where the second temperature acquisition unit 400 is disposed on the wiring device shown in fig. 2;
fig. 11 is a schematic structural diagram of a power electronic device.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In order to detect whether the connection on the ac side is abnormal, an embodiment of the present application provides a method for detecting the connection abnormality on the ac side of a power electronic device, where a specific flow is shown in fig. 1, and the method specifically includes the following steps:
and S110, detecting the current and/or the temperature of the wiring terminal and/or the output cable in real time.
Each phase output in the alternating current side of the power electronic equipment is connected with at least two output cables through a wiring device, and the output cables are connected with wiring terminals in the wiring device in a one-to-one correspondence mode.
Taking the wiring device as an example in fig. 2, the wiring device comprises a base 2, three bus bars (6-1 to 6-3) and 6 wiring terminals (1-1 to 1-3, 3-1 to 3-3); the 6 wiring terminals and the 3 bus bars are arranged on the base 2, each bus bar is connected with the 2 wiring terminals, and each bus bar is also connected with each phase output in the alternating current side of the power electronic equipment; each connecting terminal is respectively connected with one-to-one corresponding output cable (such as 4-1 to 4-3 and 5-1 to 5-3 in figure 2).
Optionally, the bus bar is a bus bar; in practical applications, including but not limited to, this, not specifically limited herein, all fall within the scope of protection of this application.
And S120, determining the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side is output to the outside according to the detection result.
Wherein, the unbalanced degree of power electronic equipment's interchange side when external output is: the degree of imbalance between three-phase output currents externally output from the alternating current side of the power electronic equipment; the degree of imbalance between the three phase output currents is: the degree to which the sum of the three-phase output currents exceeds a threshold; the threshold is preset according to actual conditions, can be determined according to specific conditions, is not specifically limited herein, and is within the protection scope of the application; in the ideal case, the threshold is zero.
S130, judging whether the unbalance degree of the alternating current side of the power electronic equipment during external output exceeds a first preset value.
If the unbalance degree of the ac side of the power electronic device during the external output exceeds the first preset value, step S140 is executed; and if the unbalance degree of the alternating current side of the power electronic equipment during external output does not exceed a first preset value, ending the execution of the detection method.
The first preset value is a preset threshold value combined with a manufacturing error in practical application to eliminate the influence caused by the manufacturing error.
Theoretically, when the unbalance degree is larger than zero, the output unbalance of the alternating current side of the power electronic equipment can be shown; in practical application, although it is ensured that a group of output cables adopts cables of the same manufacturer, the same model and the same batch as much as possible when configuring a circuit, it is still impossible to ensure that output impedances of phases on the ac side of the power electronic device are completely the same due to the influence of manufacturing errors, and therefore a first preset value needs to be set to avoid misjudgment caused by errors, that is: when the AC side of the power electronic equipment is in normal connection, the connection abnormality is judged according to the unbalance degree.
Therefore, when the unbalance degree of the alternating current side of the power electronic equipment in the external output exceeds the first preset value, the output unbalance of the alternating current side of the power electronic equipment is indicated, and when the unbalance degree of the alternating current side of the power electronic equipment in the external output does not exceed the first preset value, the output balance of the alternating current side of the power electronic equipment is indicated.
And S140, judging that the connection of the alternating current side of the power electronic equipment is abnormal.
In this embodiment, since the external output total impedance of at least one phase of the ac side of the power electronic device changes due to the abnormal connection of the ac side of the power electronic device, and further causes the imbalance of the ac side of the power electronic device when the ac side is outputting to the outside, the detection method can determine whether the ac side of the power electronic device is abnormal in connection by using the imbalance degree of the ac side of the power electronic device when the ac side is outputting to the outside.
Another embodiment of the present application provides another implementation of the method for detecting an abnormal connection on the ac side of a power electronic device, and a specific flow thereof can be as shown in fig. 3, where on the basis of the flow shown in fig. 1, after step S140 is executed, the method further includes the following steps:
s150, judging whether the unbalance degree of the alternating current side of the power electronic equipment during external output exceeds a second preset value.
If the unbalance degree of the ac side of the power electronic device during the external output does not exceed the second preset value, step S160 is executed; if the unbalance degree of the ac side of the power electronic device during the external output exceeds the second preset value, step S170 is executed.
The second preset value is a preset threshold value for avoiding overheating of the connection terminal and/or the output cable on the alternating current side of the power electronic equipment in practical application.
Theoretically, as long as the ac side of the power electronic device is connected abnormally, the terminal and/or the output cable on the ac side of the power electronic device will generate heat, however, in practical application, some connection abnormalities will cause the heat generation of the power electronic device but the heat generation degree is not serious, if it is directly considered that the power electronic device is overheated at this moment, the economic benefit will be reduced, and therefore, in consideration of the economic benefit, the second preset value needs to be set to avoid affecting the economic benefit of the power electronic device, that is: the power electronics are controlled to shut down as long as they are hot.
Therefore, when the unbalance degree of the alternating current side of the power electronic equipment during external output exceeds a second preset value, the power electronic equipment generates heat seriously at the moment; when the unbalance degree of the alternating current side of the power electronic equipment during external output does not exceed the second preset value, the fact that the power electronic equipment generates heat seriously is indicated.
And S160, controlling the derating operation of the power electronic equipment.
As can be seen from the above, when the degree of imbalance of the ac side of the power electronic device when outputting the external power is greater than the first threshold, although the ac side of the power electronic device is connected abnormally, the heat generation is not serious, and therefore, the power electronic device is controlled to perform derating operation, so that the connection terminal and/or the output cable of the power electronic device can be prevented from being damaged.
And S170, controlling the power electronic equipment to stop running.
As can be seen from the above, when the unbalance degree of the ac side of the power electronic device during the external output is greater than the second threshold, the ac side of the power electronic device is connected abnormally and generates heat seriously, so that the power electronic device needs to be controlled to stop operating to avoid damage to the power electronic device.
In summary, the method for detecting connection abnormality at the ac side of the power electronic device provided in this embodiment can control the power electronic device to keep operating as much as possible while ensuring that the power electronic device is not damaged, thereby bringing greater benefit to users and further improving economic benefit.
In practical applications, including but not limited to this, for example, after the ac side of the power electronic device is determined to be abnormal, the power electronic device is directly controlled to stop, which is not specifically limited herein and is determined according to specific situations, and all of them are within the protection scope of the present application.
Another embodiment of the present application provides a specific implementation manner of step S110, wherein three output cables respectively connected to the three-phase outputs are scored as one group; this embodiment of step S110 includes at least one of the following four embodiments:
the first embodiment is specifically as follows: the sum of the currents of the output cables in any one group is detected.
The second embodiment is specifically as follows: the sum of the currents of the bus bars in the wiring device is detected.
The third embodiment is specifically as follows: and detecting the temperature of each wiring terminal connected with each output cable in at least one group in the wiring device.
The fourth embodiment is specifically as follows: and respectively detecting the current of each output cable in at least one group.
The above are only four embodiments of step S110, and are not limited herein, and all embodiments are within the scope of the present application.
Another example of the present application provides four specific implementations of step S120, where the first specific implementation is applicable to the case where step S110 adopts the first implementation or the second implementation; this embodiment of step S120 is specifically: and the detected current is used for representing the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side is output to the outside.
The second embodiment is applicable to the case where the third embodiment or the fourth embodiment is adopted in step S110; this embodiment of step S120 is specifically: determining and representing the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side outputs to the outside by using the difference value between the maximum temperature and the minimum temperature in all the detected temperatures; or, in all the detected currents, determining and representing the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side outputs to the outside by using the difference value of the maximum current and the minimum current.
The third specific embodiment is applicable to the case where the fourth embodiment is adopted in step S110, and step S110 is specifically: detecting the current of each output cable in all the groups; this embodiment of step S120 is specifically: the method comprises the steps of firstly determining the current output by each phase in the alternating current side of the power electronic equipment according to all detected currents, then comparing the current output by each phase in the alternating current side of the power electronic equipment with the current input into each phase in the alternating current side of the power electronic equipment inside the power electronic equipment, and representing the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side of the power electronic equipment is output to the outside according to the comparison result.
The fourth embodiment is applicable to the case where the third embodiment or the fourth embodiment is adopted in step S110; this embodiment of step S120 is specifically: firstly, determining the difference between the maximum temperature and the minimum temperature in each phase in the detected temperatures of each connecting terminal connected with the output of each phase in the alternating current side of the power electronic equipment, and then determining and using the maximum difference to represent the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side is output to the outside in the difference in each phase.
The following describes a method for detecting an ac side connection abnormality of the power electronic device, by taking fig. 2 as an example:
when the sum of the currents of the output cables 5-1 to 5-3 is detected, or the sum of the currents of the bus bars 6-1 to 6-3 is detected, the sum of the currents is denoted as Ic, Ic represents the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side outputs to the outside, at the moment, the first preset value is represented by a first current threshold value Ic1, and the second preset value is represented by a second current threshold value Ic 2; if Ic1< Ic2, namely the unbalance degree of the alternating current side of the power electronic equipment during external output is greater than the first preset value but less than the second preset value, controlling the derating operation of the power electronic equipment; and if Ic > Ic2, namely the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side outputs to the outside is greater than a second preset value, controlling the power electronic equipment to stop running so as to prevent the output cable or the connecting terminal from being damaged due to overheating.
When the temperature of the wiring terminals 1-3 is detected, determining the difference value between the maximum temperature and the minimum temperature, recording the difference value as Tb, representing the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side outputs the power electronic equipment to the outside by Tb, wherein the first preset value is represented by a first temperature threshold Tb1, and the second preset value is represented by a second temperature threshold Tb 2; if Tb1< Tb < Tb2, namely the unbalance degree of the alternating current side of the power electronic equipment during the external output is greater than the first preset value but less than the second preset value, controlling the derating operation of the power electronic equipment; if Tb > Tb2, the unbalance degree when the external output of the interchange side of power electronics is greater than the second preset value, control power electronics and stop the operation to prevent output cable or binding post because of overheated and damaged.
When the currents of the output cables 5-1 to 5-3 are detected, a difference value between the maximum current and the minimum current is determined and recorded as Ic, the Ic represents the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side outputs to the outside, at the moment, the first preset value is represented by a third current threshold value Ic3, and the second preset value is represented by a fourth current threshold value Ic 4; if Ic3< Ic4, namely the unbalance degree of the alternating current side of the power electronic equipment during external output is greater than the first preset value but less than the second preset value, controlling the derating operation of the power electronic equipment; and if Ic > Ic4, namely the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side outputs to the outside is greater than a second preset value, controlling the power electronic equipment to stop running so as to prevent the output cable or the connecting terminal from being damaged due to overheating.
When the temperature of the wiring terminals 1-3 and the temperature of the wiring terminals 3-1-3 are detected, the temperature of the wiring terminals 1-3 and the temperature of the wiring terminals 3-1-3 are respectively marked as Td1-Td 6; firstly, determining the difference between the maximum temperature and the minimum temperature in Td1 and Td4, recorded as Te1, determining the difference between the maximum temperature and the minimum temperature in Td2 and Td5, recorded as Te2, and determining the difference between the maximum temperature and the minimum temperature in Td3 and Td6, recorded as Te 3; then, determining the largest difference value among the differences Te1, Te2 and Te3, and recording as Tb; at the moment, the first preset value is characterized by a first temperature threshold Tb1, and the second preset value is characterized by a second temperature threshold Tb 2; if Tb1< Tb < Tb2, namely the unbalance degree of the alternating current side of the power electronic equipment during external output is greater than the first preset value but less than the second preset value, controlling the derating operation of the power electronic equipment; if Tb > Tb2, the unbalance degree when the external output of the interchange side of power electronics is greater than the second preset value, control power electronics and stop the operation to prevent output cable or binding post because of overheated and damaged.
When the currents of the output cables 4-1 to 4-3 and the currents of the output cables 5-1 to 5-3 are detected, the currents of the output cables 4-1 to 4-3 and the currents of the output cables 5-1 to 5-3 are respectively marked as Id1-Id 6; the difference between the maximum current and the minimum current is determined in Id1 and Id4, denoted as Ie1, in Id2 and Id5, denoted as Ie2, and in Id3 and Id6, denoted as Ie 3; then, determining the largest difference value among the difference values Ie1, Ie2 and Ie3, and recording as Ic; at the moment, the first preset value is characterized by a first current threshold value Ic1, and the second preset value is characterized by a second current threshold value Ic 2; if Ic1< Ic2, namely the unbalance degree of the alternating current side of the power electronic equipment during external output is greater than the first preset value but less than the second preset value, controlling the derating operation of the power electronic equipment; and if Ic > Ic2, namely the unbalance degree of the alternating current side of the power electronic equipment when the alternating current side outputs to the outside is greater than a second preset value, controlling the power electronic equipment to stop running so as to prevent the output cable or the connecting terminal from being damaged due to overheating.
Another embodiment of the present application provides a device for detecting connection abnormality at an ac side of a power electronic device, which specifically includes: a detection module and a controller.
In the detection apparatus, the detection module is configured to execute step S110 in the method for detecting an ac side connection abnormality of a power electronic device according to any one of the embodiments; the controller is connected with the detection module and is used for executing other steps except the step S110 in the detection method.
Optionally, the controller may be a DSP, an ARM, an FPGA, or even a CPLD; in practical applications, including but not limited to the above embodiments, there is no specific limitation, and the embodiments are within the scope of the present application.
When the first embodiment or the second embodiment is adopted in step S110, the detection module includes: a current collection device; the input end of the current acquisition device is sleeved on each busbar or the corresponding group of output cables in the wiring device, and the output end of the current acquisition device is connected with the controller.
Optionally, the current collecting device may be the transformer 100, or may be the magnetic ring 200 provided with the first temperature collecting device 300.
The first temperature collecting device 300 may be disposed at any position of the magnetic ring 200, which is not limited herein, and is within the protection scope of the present application as the case may be.
When the current collecting device is a transformer 100, as shown in fig. 4, the input end of the transformer 100 is sleeved on each busbar in the wiring device, or, as shown in fig. 5 or fig. 6, the input end of the transformer 100 is sleeved on a corresponding group of output cables; the output of the transformer 100 is connected to a controller (the controller is not shown in fig. 4, 5 or 6).
When the current collecting device is a magnetic ring 200 of the first temperature collecting device 300, as shown in fig. 7, the magnetic ring 200 (the specific structure of the first temperature collecting device 300 is not shown in the figure, and only the point represents the first temperature collecting device 300 to show the installation position thereof) covers each bus bar in the wiring device, or, as shown in fig. 8 or fig. 9, the magnetic ring 200 covers the corresponding group of output cables; the output of the first temperature acquisition device 300 is connected to a controller (the controller is not shown in fig. 7, 8 or 9).
It should be noted that, in the present embodiment, the sum of the currents of the output cables in any one group or the sum of the currents of the bus bars in the wiring device is represented by the output of the transformer 100, or represented by the output of the first temperature acquisition device 300.
It should be noted that, when the sum of the currents of the output cables in any one group or the sum of the currents of the bus bars in the wiring device is represented by the output of the first temperature acquisition device 300, the first preset value and the second preset value are represented by the temperature threshold.
When the fourth embodiment is adopted in step S110, the detection module includes: at least three current collection devices; the input end of each current acquisition device is respectively sheathed with the corresponding output cable, and the output end of each current acquisition device is respectively connected with the controller.
Optionally, the current collecting device may be the transformer 100, or may be the magnetic ring 200 provided with the first temperature collecting device 300.
The first temperature collecting device 300 may be disposed at any position of the magnetic ring 200, which is not limited herein, and is within the protection scope of the present application as the case may be.
When the current collecting device is the mutual inductor 100, the input end of each mutual inductor 100 is respectively sleeved on the corresponding output cable, for example, 4-1, 4-2, 4-3 in fig. 2, and the output end of each mutual inductor 100 is respectively connected with the controller.
When the current collecting devices are magnetic rings 200 provided with first temperature collecting devices 300, each magnetic ring 200 respectively covers the corresponding output cable, for example, as 4-1, 4-2, 4-3 in fig. 2, and the output end of each first temperature collecting device 300 is respectively connected with the controller.
It should be noted that, in the present embodiment, the current of each output cable in at least one group is represented by the output of the corresponding transformer 100, or represented by the output of the corresponding first temperature acquisition device 300.
It is noted that the first preset value and the second preset value are characterized by a temperature threshold value when the current of each output cable of at least one group is characterized by the output of the corresponding first temperature acquisition device 300.
When the third embodiment is adopted in step S110, the detection module includes: at least three second temperature collection devices 400 (the specific structure thereof is not shown in the drawing, and only the installation positions thereof are shown).
As shown in fig. 10, the collecting end of each second temperature collecting device 400 is respectively disposed at the connection point of each connection terminal connected to at least one group of output cables in the wiring device and the corresponding bus bar; the output end of the second temperature acquisition device 400 is connected with the controller.
In this embodiment, the temperature of each connection terminal of the wiring device, which is connected to each output cable of at least one group, is represented by the output of each second temperature acquisition device 400.
Another embodiment of the present application provides a power electronic apparatus, a specific structure of which can be seen in fig. 11 (fig. 11 only shows the circuit topology of the wiring device 03 by taking fig. 2 as an example, and fig. 11 only shows an implementation manner of the detection device 02 as an example), which specifically includes: the inverter device 01 and the detection device 02 for detecting the connection abnormality on the ac side of the power electronic apparatus as provided in the above embodiments.
In the power electronic equipment, at least one side of a conversion device 01 is an alternating current side, the alternating current side of the conversion device 01 is connected with the alternating current side of the power electronic equipment, and each phase output of the alternating current side of the power electronic equipment is connected with at least two output cables through a wiring device 03; the detection device 02 is provided on the ac side of the power electronic apparatus.
It should be noted that the structure of the wiring device has been described in detail in the above embodiments, and is not described herein again; in addition, when step S120 executed by the controller in the detection device is the third embodiment, it is necessary to add the detection device, i.e., 04 in fig. 11, inside the ac side of the power electronic apparatus.
Optionally, the Conversion device may be an inverter, or may also be a PCS (Power Conversion System) in the energy storage System; in practical applications, including but not limited to, this, it is not limited specifically here, and it is within the scope of this application as the case may be.
In the above description of the disclosed embodiments, features described in various embodiments in this specification can be substituted for or combined with each other to enable those skilled in the art to make or use the present application. The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (15)
1. The method for detecting the abnormal connection of the alternating current side of the power electronic equipment is characterized in that each phase output in the alternating current side is connected with at least two output cables through a wiring device, and the output cables are connected with wiring terminals in the wiring device in a one-to-one correspondence manner; the detection method comprises the following steps:
s110, detecting the current and/or the temperature of the wiring terminal and/or the output cable in real time;
s120, determining the unbalance degree of the alternating current side during external output according to the detection result;
s130, judging whether the unbalance degree exceeds a first preset value or not;
if the unbalance degree exceeds the first preset value, executing step S140;
and S140, judging that the connection on the alternating current side is abnormal.
2. The method for detecting connection abnormality on the ac side of a power electronic device according to claim 1, further comprising, after executing step S140:
s150, judging whether the unbalance degree exceeds a second preset value or not;
if the unbalance degree does not exceed the second preset value, executing step S160;
and S160, controlling the derating operation of the power electronic equipment.
3. The method for detecting the abnormal connection on the alternating current side of the power electronic equipment according to claim 1, wherein if the unbalance degree exceeds the second preset value, the method comprises the following steps: the following steps are carried out:
and S170, controlling the power electronic equipment to stop running.
4. The method for detecting connection abnormality on the ac side of a power electronic device according to claim 3, further comprising, while executing step S140:
and S180, reporting the connection abnormity of the alternating current side.
5. The method according to any one of claims 1 to 4, wherein three output cables respectively connected to three-phase outputs are grouped; step S110, including at least one of:
detecting the sum of the currents of the output cables in any one group;
detecting the sum of the currents of all bus bars in the wiring device;
detecting the temperature of each wiring terminal connected with each output cable in at least one group in the wiring device;
and respectively detecting the current of each output cable in at least one group.
6. The method according to claim 5, wherein when the detection result is a sum of currents of the output cables in any one of the groups or a sum of currents of bus bars in the wiring device, the step S120 includes:
the detected current is used to characterize the degree of imbalance.
7. The method according to claim 5, wherein when the detection result is a temperature of each of connection terminals of the connection device connected to each of the output cables in at least one group or a current of each of the output cables in at least one group, the step S120 includes:
determining and characterizing the unbalance degree by the difference between the maximum temperature and the minimum temperature in all the detected temperatures; or,
the difference between the maximum current and the minimum current is determined and used to characterize the degree of imbalance among all the currents detected.
8. The method according to claim 5, wherein when the detection result is the current of each of the output cables in all the groups, the step S120 includes:
determining the current output by each phase in the alternating current side according to all detected currents;
and comparing the current output by each phase at the alternating current side with the current input to each phase at the alternating current side in the power electronic equipment, and representing the unbalance degree according to the comparison result.
9. The method according to claim 5, wherein when the detection result is a temperature of each of connection terminals of the connection device connected to each of the output cables in at least one group or a current of each of the output cables in at least one group, the step S120 includes:
determining the difference value between the maximum temperature and the minimum temperature in each phase in the detected temperatures of each wiring terminal connected with each phase output of the alternating current side;
of the differences within the phases, the greatest difference is determined and used to characterize the degree of imbalance.
10. An apparatus for detecting connection abnormality on an ac side of a power electronic device, comprising: a detection module and a controller; wherein:
the detection module is used for executing step S110 in the detection method for detecting the connection abnormality of the alternating current side of the power electronic equipment according to any one of claims 1 to 9;
the controller is connected with the detection module and is used for executing other steps except the step S110 in the detection method of the abnormal connection of the alternating current side of the power electronic equipment.
11. The apparatus for detecting connection abnormality on ac side of power electronic equipment according to claim 10, wherein when said detection module is used to detect the sum of currents in any one of the output cables or the sum of currents in bus bars in the wiring device, said detection module comprises: a current collection device; wherein:
the input end of the current acquisition device is sleeved on each bus bar or the corresponding group of the output cables, and the output end of the current acquisition device is connected with the controller.
12. The apparatus for detecting connection abnormality on the ac side of a power electronic device according to claim 10, wherein when said detection means is used to detect each current in at least one set of output cables, said detection means includes: at least three current collection devices;
the input end of each current acquisition device is respectively sleeved on the corresponding output cable, and the output end of each current acquisition device is respectively connected with the controller.
13. The apparatus for detecting connection abnormality on the ac side of a power electronic device according to claim 11 or 12, wherein the current collection device includes: mutual inductor or be provided with the magnetic ring of first temperature acquisition device.
14. The apparatus for detecting an abnormal connection on an ac side of a power electronic device according to claim 10, wherein when the detection module is used to detect a temperature of each of connection terminals connected to at least one set of output cables in the connection device, the detection module includes: at least three second temperature acquisition devices; wherein:
the collecting end of each second temperature collecting device is respectively arranged at the connecting part of each wiring terminal connected with at least one group of output cables in the wiring device and the corresponding bus bar;
and the output end of the second temperature acquisition device is connected with the controller.
15. A power electronic device, comprising: a conversion device, a detection device for detecting connection abnormality on the ac side of the power electronic apparatus according to any one of claims 10 to 14; wherein:
at least one side of the conversion device is an alternating current side, the alternating current side of the conversion device is connected with the alternating current side of the power electronic equipment, and each phase output of the alternating current side of the power electronic equipment is connected with at least two output cables through a wiring device;
the detection device is arranged on the alternating current side.
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Application publication date: 20220510 |