阅读说明：本技术 一种配网用柔直换流阀检测方法及装置 (Flexible direct converter valve detection method and device for distribution network ) 是由 胡四全 滕林阳 吉攀攀 俎立峰 马太虎 慕小乐 刘静一 赵洋洋 李文雅 樊宏伟 于 2021-07-19 设计创作，主要内容包括：本发明公开了一种配网用柔直换流阀检测方法及装置,其中方法包括如下步骤：获取子模块的IGBT开关频率和电容电压波动率,进而得到周期性回检数据；判断IGBT开关频率、电容电压波动率和/或周期性回检数据是否异常；当上述数据异常但未故障旁路时,判定子模块处于亚健康状态,通过人机交互界面发出状态告警信号,并依据外界控制指令控制子模块的旁路开关闭合。通过判断子模块的IGBT开关频率、电容电压波动率和周期性回检数据是否异常,以满足现场对换流阀进行全面状态评估的要求,可对异常子模块进行及时预警以便及时进行干预,控制对应旁路开关闭合,并避免异常子模块进一步恶化。(The invention discloses a method and a device for detecting a flexible-straight converter valve for a distribution network, wherein the method comprises the following steps: obtaining the IGBT switching frequency and the capacitance voltage fluctuation rate of the sub-module, and further obtaining periodic return inspection data; judging whether the IGBT switching frequency, the capacitor voltage fluctuation rate and/or the periodic return inspection data are abnormal or not; and when the data is abnormal but the bypass is not in fault, judging that the sub-module is in a sub-health state, sending a state alarm signal through a human-computer interaction interface, and controlling a bypass switch of the sub-module to be closed according to an external control instruction. Whether the IGBT switching frequency, the capacitor voltage fluctuation rate and the periodic return inspection data of the sub-modules are abnormal or not is judged to meet the requirement of carrying out comprehensive state evaluation on the converter valve on site, early warning can be carried out on the abnormal sub-modules in time so as to intervene in time, the corresponding bypass switches are controlled to be closed, and further deterioration of the abnormal sub-modules is avoided.)

1. The method for detecting the flexible direct converter valve for the distribution network is characterized in that a converter valve controller is connected with submodules through a plurality of submodule controllers respectively, and comprises the following steps:

obtaining the IGBT switching frequency and the capacitance voltage fluctuation rate of the sub-module, and further obtaining periodic return inspection data;

judging whether the IGBT switching frequency, the capacitor voltage fluctuation rate and/or the periodic return inspection data are abnormal or not;

and when the IGBT switching frequency, the capacitor voltage fluctuation rate and/or the periodic return inspection data are abnormal but the bypass is not in fault, judging that the sub-module is in a sub-health state, sending a state alarm signal through a man-machine interaction interface, and controlling the bypass switch of the sub-module to be closed according to an external control instruction.

2. The method for detecting the flexible direct current converter valve for the distribution network according to claim 1, wherein the obtaining of the IGBT switching frequency of the sub-module comprises:

obtaining the on-off state of the IGBT in the current period;

judging whether the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, keeping the switch frequency count unchanged when the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, and adding a third preset value to the value of the IGBT switch frequency if the IGBT on-off state of the current period is inconsistent with the IGBT on-off state of the previous period;

and when the counting time reaches the preset time, outputting the switching frequency count of the IGBT.

3. The method for detecting the flexible direct current converter valve for the distribution network according to claim 1, wherein the obtaining of the capacitance voltage fluctuation rate of the sub-module comprises:

acquiring capacitor voltages of all the sub-modules in the current period, and further acquiring the highest voltage value and the lowest voltage value of the capacitor voltages;

and obtaining the fluctuation rate of the capacitor voltage according to the highest voltage value and the lowest voltage value.

4. The method for detecting the flexible direct current converter valve for the distribution network according to claim 1, wherein the step of judging whether the switching frequency and/or the voltage fluctuation rate of the IGBT are/is abnormal comprises the following steps:

judging whether the IGBT switching frequency exceeds a first preset proportional value of the rated working switching frequency or not; and/or

And judging whether the fluctuation rate of the capacitor voltage exceeds a second preset proportion value of the rated working voltage.

5. The method for detecting the flexible direct current converter valve for the distribution network according to claim 1,

the periodic review data includes: counting optical fiber communication jitter, abnormal IGBT driving, bypass switch misoperation and/or IGBT junction temperature data;

the judging whether the periodic review data is abnormal includes:

judging whether the increasing times of the optical fiber communication jitter count in a first preset time exceeds a first preset numerical value or not; and/or

Judging that the IGBT junction temperature data exceeds a third preset proportion value of rated working temperature-saving data; and/or

Judging whether the driving abnormal times of the IGBT driving board in second preset time exceeds a second preset numerical value or not; and/or

And judging whether the bypass switch is operated by mistake.

6. The utility model provides a join in marriage net with gentle straight converter valve detection device which characterized in that, through converter valve controller respectively with a plurality of submodule controller and correspond submodule piece and be connected, include:

the acquisition module is used for acquiring the IGBT switching frequency and the capacitance voltage fluctuation rate of the sub-module so as to obtain periodic return inspection data;

the judging module is used for judging whether the IGBT switching frequency, the capacitor voltage fluctuation rate and/or the periodic return inspection data are abnormal or not;

and the control module is used for judging that the sub-module is in a sub-health state when the IGBT switching frequency, the capacitance voltage fluctuation rate and/or the periodic return inspection data are abnormal but not in fault bypass, sending a state alarm signal through a man-machine interaction interface, and controlling the bypass switch of the sub-module to be closed according to an external control instruction.

7. The device for detecting the flexible direct current converter valve for the distribution network according to claim 6, wherein the obtaining module comprises:

the first acquisition unit is used for acquiring the on-off state of the IGBT in the current period;

the first judging unit is used for judging whether the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, when the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, the switching frequency count is kept unchanged, and if the IGBT on-off state is inconsistent with the IGBT on-off state of the previous period, a third preset value is added to the value of the IGBT switching frequency;

and the first control unit is used for outputting the switching frequency count of the IGBT when the counting time reaches the preset time.

8. The device for detecting the flexible direct current converter valve for the distribution network according to claim 6, wherein the obtaining module comprises:

the second obtaining unit is used for obtaining the capacitance voltages of all the sub-modules in the current period so as to obtain the highest voltage value and the lowest voltage value of the capacitance voltages;

and the first calculation unit is used for obtaining the fluctuation rate of the capacitor voltage according to the highest voltage value and the lowest voltage value.

9. The device for detecting the flexible direct current converter valve for the distribution network according to claim 5, wherein the judging module comprises:

the second judgment unit is used for judging whether the IGBT switching frequency exceeds a first preset proportion value of the rated working switching frequency or not; and/or

The third judging unit is used for judging whether the fluctuation rate of the capacitor voltage exceeds a second preset proportion value of the rated working voltage or not;

and the fourth judging unit is used for judging whether the periodic return inspection data is abnormal or not.

10. The detecting device for the flexible direct current converter valve for the distribution network according to claim 5,

the periodic review data includes: counting optical fiber communication jitter, abnormal IGBT driving, bypass switch misoperation and/or IGBT junction temperature data;

the fourth judgment unit includes:

the first judging subunit is used for judging whether the increasing times of the optical fiber communication jitter count in a first preset time exceeds a first preset value or not; and/or

The second judging subunit is used for judging that the IGBT junction temperature data exceeds a third preset proportion value of rated working temperature-saving data; and/or

The third judgment subunit is used for judging whether the driving abnormity frequency of the IGBT driving board in second preset time exceeds a second preset numerical value; and/or

And the fourth judgment subunit is used for judging whether the bypass switch is operated by mistake.

Technical Field

The invention relates to the technical field of flexible direct current control, in particular to a method and a device for detecting a flexible direct current converter valve for a distribution network.

Background

The flexible converter valve for the distribution network is used as a core component for performing alternating current-direct current energy conversion in a power network, and the health state of the flexible converter valve directly influences the operation stability and reliability of the whole distribution network project. Converter valves are usually composed of a plurality of sub-modules connected in series, and each sub-module contains a plurality of key components, so how to efficiently evaluate the health status of the converter valve sub-modules and take necessary measures to prevent further deterioration of abnormal conditions becomes an important content for daily operation and maintenance. The current monitoring function of the converter valve is only limited to reporting a fault remote signaling event after a submodule has a fault, and does not have the monitoring function of key components such as a valve component and the like. When the key components of the power modules are abnormal, the key components cannot be found as early as possible, and great hidden danger exists for the safe operation of the system.

Disclosure of Invention

The embodiment of the invention aims to provide a method and a device for detecting a flexible-straight converter valve for a distribution network, which can meet the requirement of on-site comprehensive state evaluation on the converter valve by acquiring and judging whether the IGBT switching frequency, the capacitance voltage fluctuation rate and the periodic return inspection data of a submodule are abnormal but not in fault bypass, can perform early warning on the abnormal submodule in time so as to intervene in time, control the closing of a corresponding bypass switch and avoid the further deterioration of the abnormal submodule.

In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a method for detecting a flexible-straight converter valve for a distribution network, where a converter valve controller is connected to a submodule through a plurality of submodule controllers, respectively, the method including the steps of:

obtaining the IGBT switching frequency and the capacitance voltage fluctuation rate of the sub-module, and further obtaining periodic return inspection data;

judging whether the IGBT switching frequency sum, the capacitance voltage fluctuation rate and/or the periodic return inspection data are abnormal or not;

and when the IGBT switching frequency sum, the capacitance voltage fluctuation rate and/or the periodic return inspection data are abnormal but the bypass is not in fault, judging that the sub-module is in a sub-health state, sending a state alarm signal through a man-machine interaction interface, and controlling the bypass switch of the sub-module to be closed according to an external control instruction.

Further, the obtaining the IGBT switching frequency of the sub-module includes:

obtaining the on-off state of the IGBT in the current period;

judging whether the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, keeping the switch frequency count unchanged when the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, and adding a third preset value to the value of the IGBT switch frequency if the IGBT on-off state of the current period is inconsistent with the IGBT on-off state of the previous period;

and when the counting time reaches the preset time, outputting the switching frequency count of the IGBT.

Further, the obtaining of the capacitance-voltage fluctuation rate of the sub-module includes:

acquiring capacitor voltages of all the sub-modules in the current period, and further acquiring the highest voltage value and the lowest voltage value of the capacitor voltages;

and obtaining the fluctuation rate of the capacitor voltage according to the highest voltage value and the lowest voltage value.

Further, the determining whether the switching frequency and/or the capacitance voltage fluctuation rate of the IGBT are abnormal includes:

judging whether the IGBT switching frequency exceeds a first preset proportional value of the rated working switching frequency or not; and/or

And judging whether the fluctuation rate of the capacitor voltage exceeds a second preset proportion value of the rated working voltage. Further, the periodic review data includes: counting optical fiber communication jitter, abnormal IGBT driving, bypass switch misoperation and/or IGBT junction temperature data;

the judging whether the periodic review data is abnormal includes:

judging whether the increasing times of the optical fiber communication jitter count in a first preset time exceeds a first preset numerical value or not; and/or

Judging that the IGBT junction temperature data exceeds a third preset proportion value of rated working temperature-saving data; and/or

Judging whether the driving abnormal times of the IGBT driving board in second preset time exceeds a second preset numerical value or not; and/or

And judging whether the bypass switch is operated by mistake.

Accordingly, a second aspect of the embodiments of the present invention provides a flexible direct converter valve detection apparatus for a distribution network, which is connected to a plurality of sub-module controllers and corresponding sub-modules through converter valve controllers, respectively, and includes:

the acquisition module is used for acquiring the IGBT switching frequency and the capacitance voltage fluctuation rate of the sub-module so as to obtain periodic return inspection data;

the judging module is used for judging whether the IGBT switching frequency, the capacitor voltage fluctuation rate and/or the periodic return inspection data are abnormal or not;

and the control module is used for judging that the sub-module is in a sub-health state when the IGBT switching frequency, the capacitance voltage fluctuation rate and/or the periodic return inspection data are abnormal but not in fault bypass, sending a state alarm signal through a man-machine interaction interface, and controlling the bypass switch of the sub-module to be closed according to an external control instruction.

Further, the obtaining module comprises:

the first acquisition unit is used for acquiring the on-off state of the IGBT in the current period;

the first judging unit is used for judging whether the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, when the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, the switching frequency count is kept unchanged, and if the IGBT on-off state is inconsistent with the IGBT on-off state of the previous period, a third preset value is added to the value of the IGBT switching frequency;

and the first control unit is used for outputting the switching frequency count of the IGBT when the counting time reaches the preset time.

Further, the obtaining module comprises:

the second obtaining unit is used for obtaining the capacitance voltages of all the sub-modules in the current period so as to obtain the highest voltage value and the lowest voltage value of the capacitance voltages;

and the first calculation unit is used for obtaining the fluctuation rate of the capacitor voltage according to the highest voltage value and the lowest voltage value.

Further, the judging module comprises:

the second judgment unit is used for judging whether the IGBT switching frequency exceeds a first preset proportion value of the rated working switching frequency or not; and/or

The third judging unit is used for judging whether the fluctuation rate of the capacitor voltage exceeds a second preset proportion value of the rated working voltage or not;

and the fourth judging unit is used for judging whether the periodic return inspection data is abnormal or not.

Further, the periodic review data includes: counting optical fiber communication jitter, abnormal IGBT driving, bypass switch misoperation and/or IGBT junction temperature data;

the fourth judgment unit includes:

the first judging subunit is used for judging whether the increasing times of the optical fiber communication jitter count in a first preset time exceeds a first preset value or not; and/or

The second judging subunit is used for judging that the IGBT junction temperature data exceeds a third preset proportion value of rated working temperature-saving data; and/or

The third judgment subunit is used for judging whether the driving abnormity frequency of the IGBT driving board in second preset time exceeds a second preset numerical value;

and/or a fourth judging subunit for judging whether the bypass switch is operated by mistake.

Accordingly, a third aspect of the embodiments of the present invention further provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the storage stores instructions executable by the processor, and the instructions are executed by the processor to enable the at least one processor to execute the distribution network flexible direct current converter valve detection method.

In addition, a fourth aspect of the embodiments of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the instructions are executed by a processor, the method for detecting a flexible direct current converter valve for a distribution network is implemented.

The technical scheme of the embodiment of the invention has the following beneficial technical effects:

the requirement of carrying out comprehensive state evaluation on the converter valve on site is met by obtaining and judging whether the IGBT switching frequency, the capacitance voltage fluctuation rate and/or the periodic return inspection data of the sub-modules are abnormal but not in fault bypass, early warning can be carried out on the abnormal sub-modules in time so as to intervene in time, the corresponding bypass switches are controlled to be closed, and further deterioration of the abnormal sub-modules is avoided.

Drawings

Fig. 1 is a flowchart of a method for detecting a flexible direct current converter valve for a distribution network according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a detection principle of a flexible direct current converter valve for a distribution network according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a sub-module bypass switch provided by an embodiment of the present invention;

fig. 4 is a block diagram of a module of a flexible direct current converter valve detection device for a distribution network according to an embodiment of the present invention;

FIG. 5 is a block diagram of an acquisition module provided by embodiments of the present invention;

FIG. 6 is a block diagram of a determination module provided by an embodiment of the present invention;

fig. 7 is a block diagram of a fourth determining unit according to an embodiment of the present invention.

Reference numerals:

1. the device comprises an acquisition module, 11, a first acquisition unit, 12, a first judgment unit, 13, a first control unit, 14, a second acquisition unit, 15, a first calculation unit, 2, a judgment module, 21, a second judgment unit, 22, a third judgment unit, 23, a fourth judgment unit, 231, a first judgment subunit, 232, a second judgment subunit, 233, a third judgment subunit, 234, a fourth judgment subunit, 3 and a control module.

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 in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Fig. 1 is a flowchart of a method for detecting a flexible direct current converter valve for a distribution network according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a detection principle of a flexible direct current converter valve for a distribution network according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a sub-module bypass switch provided by an embodiment of the invention.

Referring to fig. 1, fig. 2 and fig. 3, a first aspect of an embodiment of the present invention provides a method for detecting a flexible direct current converter valve for a distribution network, where a converter valve controller is connected to a sub-module through a plurality of sub-module controllers, respectively, and the method includes the following steps:

s100, obtaining the IGBT switching frequency and the capacitance voltage fluctuation rate of the sub-modules, and further obtaining periodic return inspection data.

And S200, judging whether the IGBT switching frequency, the capacitance voltage fluctuation rate and/or the periodic return inspection data are abnormal or not.

S300, when the IGBT switching frequency, the capacitance voltage fluctuation rate and/or the periodic return inspection data are abnormal but the bypass is not in fault, judging that the sub-module is in a sub-health state, sending a state alarm signal through a man-machine interaction interface, and controlling the bypass switch of the sub-module to be closed according to an external control instruction.

In step S300, after the sub-module is judged to be in the sub-health state, for the sub-module which is in the imminent abnormal state, a sub-module bypass switch closing instruction is manually issued through a human-computer interaction interface, the serial number of the sub-module which needs to be bypassed is received through the human-computer interaction interface, and the serial number is forwarded to a valve controller; generating a sub-module bypass switch trigger instruction by a valve controller, and sending the trigger instruction to a sub-module controller; after the sub-module controller receives a bypass instruction of the valve controller, the bypass switch K is triggered to be closed, the sub-module capacitor starts to discharge, the sub-module capacitor does not participate in the control of the converter valve any more, and the sub-module fault is prevented from further deteriorating.

According to the flexible-straight converter valve detection method for the distribution network, whether the IGBT switching frequency, the capacitance voltage fluctuation rate and the periodic return inspection data of the sub-modules are abnormal or not is obtained and judged, so that the requirement of carrying out comprehensive state evaluation on the converter valve on site is met, early warning can be timely carried out on the abnormal sub-modules so as to intervene timely, the corresponding bypass switches are controlled to be closed, and further deterioration of the abnormal sub-modules is avoided.

Specifically, in the embodiment of the invention, the system comprises a sub-module controller, a valve controller, a flexible direct converter valve detection device and a human-computer interaction interface which are connected in sequence: the sub-module controller is connected with the valve controller through optical fibers, the valve controller is connected with the flexible-straight converter valve detection device through the optical fibers, and the flexible-straight converter valve detection device is connected with the human-computer interaction interface through network cables.

Further, in S100, acquiring the IGBT switching frequency of the sub-module includes:

and S111, acquiring the on-off state of the IGBT in the current period.

After the on-off state of the IGBT in the current period is obtained, the on-off state of the IGBT in the current period is stored in a buffer so as to be compared with the on-off state of the IGBT in the next period.

And S112, judging whether the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, keeping the switching frequency count unchanged when the IGBT on-off state of the current period is consistent with the IGBT on-off state of the previous period, and adding a third preset value 1 to the value of the IGBT switching frequency when the IGBT on-off state of the current period is inconsistent with the IGBT switching frequency of the previous period.

Optionally, the third preset value is 1.

And S113, outputting the switching frequency count of the IGBT when the counting time reaches the preset time.

And if the counting time is not the preset time, continuing to acquire the turn-on and turn-off state of the IGBT in the next period until the counting time is the preset time.

Of course, the preset time may be 1 second, or may be other preset time lengths, as long as the value of the IGBT switching frequency in the unit time can be calculated.

In addition, before step S111, the method further includes clearing the switching frequency count of the sub-module IGBT and clearing the statistical time count.

Further, in step S100, obtaining the capacitance-voltage fluctuation rate of the sub-module includes:

and S121, acquiring the capacitor voltages of all the sub-modules in the current period, and further acquiring the highest voltage value and the lowest voltage value of the capacitor voltages.

Prior to step S121, there is also included: and clearing the fluctuation rate of the capacitance voltage of the submodule.

And S122, obtaining the fluctuation rate of the capacitor voltage according to the highest voltage value and the lowest voltage value.

In step S200, determining whether the IGBT switching frequency and/or the capacitance voltage fluctuation rate are abnormal includes:

s210, judging whether the IGBT switching frequency exceeds a first preset proportion value of the rated working switching frequency.

And when the IGBT switching frequency exceeds 20% of the rated working switching frequency, judging that the IGBT switching frequency is in an abnormal state. And/or

And S220, judging whether the fluctuation rate of the capacitor voltage exceeds a second preset proportion value of the rated working voltage.

And when the fluctuation rate of the capacitor voltage exceeds +/-30% of the rated working voltage, judging that the fluctuation rate of the capacitor voltage is in an abnormal state.

Specifically, the periodic review data includes: the method comprises the following steps of optical fiber communication jitter counting, IGBT driving abnormity, bypass switch misoperation and IGBT junction temperature data.

Step S200 further includes:

and S230, judging whether the periodic return inspection data is abnormal or not.

Step S230 further includes:

s231, judging whether the increasing times of the optical fiber communication jitter count in the first preset time exceeds a first preset value. When the optical fiber communication jitter count increases more than 100 times within 1 hour, it is determined that the optical fiber communication jitter is in an abnormal state. And/or

And S232, judging that the IGBT junction temperature data exceed a third preset proportion value of the rated working temperature-saving data. And when the IGBT junction temperature exceeds 15% of the rated working temperature, judging that the IGBT junction temperature data is in an abnormal state. And/or

And S233, judging whether the abnormal driving times of the IGBT driving board in the second preset time exceeds a second preset numerical value. And when the IGBT driving board is abnormally driven for 10 times within 1 hour, judging that the IGBT driving board is in an abnormal state. And/or

And S234, judging whether the bypass switch is operated by mistake. And when the bypass switch is in misoperation, judging that the bypass switch is abnormal.

The optical fiber communication jitter count is obtained as follows: controlling the valve controller to send periodic heartbeat to the submodule controller according to a preset rule; judging whether the periodic heartbeat received by the sub-module controller conforms to the preset rule or not; if the optical fiber jitter fault count value is consistent with the optical fiber jitter fault count value, keeping the optical fiber jitter fault count value unchanged; and if the fiber jitter fault count value does not match with the fiber jitter fault count value, adding 1 to the fiber jitter fault count value.

Optionally, the preset rule may be that 1 is added to the value of the periodic heartbeat in each period, and the value of the periodic heartbeat returns to 0 when reaching 255.

FIG. 4 is a block diagram of a module of a flexible direct current converter valve detection device for a distribution network according to an embodiment of the present invention

Accordingly, referring to fig. 2, a second aspect of the embodiments of the present invention provides a flexible-straight converter valve detection apparatus for a distribution network, which is connected to a plurality of sub-module controllers and corresponding sub-modules through converter valve controllers, respectively, and includes: the device comprises an acquisition module 1, a judgment module 2 and a control module 3. The acquisition module 1 is used for acquiring the IGBT switching frequency and the capacitance voltage fluctuation rate of the sub-module so as to obtain periodic return inspection data; the judging module 2 is used for judging whether the IGBT switching frequency, the capacitance voltage fluctuation rate and the periodic return inspection data are abnormal or not; and the control module 3 is used for judging that the sub-module is in a sub-health state when the IGBT switching frequency, the capacitance voltage fluctuation rate and the periodic return inspection data are abnormal but a fault bypass is not generated, sending a state alarm signal through a man-machine interaction interface, and controlling the bypass switch of the sub-module to be closed according to an external control instruction.

Fig. 5 is a block diagram of an acquisition module according to an embodiment of the present invention.

Further, referring to fig. 5, the obtaining module 1 includes: a first acquisition unit 11, a first judgment unit 12 and a first control unit 13. The first obtaining unit 11 is configured to obtain an on-off state of the IGBT in a current period; the first judging unit 12 is configured to judge whether the IGBT on-off state in the current period is consistent with the IGBT on-off state in the previous period, and if the IGBT on-off state in the current period is consistent with the IGBT on-off state in the previous period, the switching frequency count remains unchanged, and if the IGBT on-off state in the previous period is inconsistent with the switching frequency count, the value of the switching frequency of the IGBT is increased by 1; the first control unit 13 is configured to output a switching frequency count of the IGBT when the counted count time reaches a preset time.

Further, referring to fig. 5, the obtaining module 1 includes: a second acquisition unit 14 and a first calculation unit 15. The second obtaining unit 14 is configured to obtain capacitance voltages of all sub-modules in a current period, and further obtain a highest voltage value and a lowest voltage value of the capacitance voltages; the first calculating unit 15 is configured to obtain the capacitance voltage fluctuation ratio from the highest voltage value and the lowest voltage value.

Fig. 6 is a block diagram of a determining module according to an embodiment of the present invention.

Further, referring to fig. 6, the determining module 2 includes:

a second judging unit 21, configured to judge whether the IGBT switching frequency exceeds a first preset proportional value of the rated operating switching frequency; and/or

A third judging unit 22, configured to judge whether the fluctuation rate of the capacitor voltage exceeds a second preset proportional value of the rated operating voltage;

and a fourth judging unit 23 for judging whether the periodic review data is abnormal.

Further, the periodic review data includes: fiber optic communication jitter count, IGBT drive anomalies, bypass switch glitches, and/or IGBT junction temperature data.

Fig. 7 is a block diagram of a fourth determining unit according to an embodiment of the present invention.

Referring to fig. 7, further, the fourth determining unit 23 includes:

a first determining subunit 231, configured to determine whether an increase number of the optical fiber communication jitter count within a first preset time exceeds a first preset value; and/or

The second judging subunit 232 is configured to judge that the IGBT junction temperature data exceeds a third preset proportion value of the rated operating temperature saving data; and/or

A third judging subunit 233, configured to judge whether the driving abnormality frequency of the IGBT driving board in the second preset time exceeds a second preset value; and/or

A fourth judging subunit 234, configured to judge whether the bypass switch is malfunctioning.

According to the flexible-straight converter valve detection device for the distribution network, whether igbt switching frequency, capacitance voltage fluctuation rate and/or periodic return inspection data of the sub-modules are abnormal or not is obtained and judged so as to meet the requirement of carrying out comprehensive state evaluation on the converter valve on site, early warning can be carried out on the abnormal sub-modules so as to intervene timely, the corresponding bypass switches are controlled to be closed, and further deterioration of the abnormal sub-modules is avoided.

Accordingly, a third aspect of the embodiments of the present invention further provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the storage stores instructions executable by a processor, and the instructions are executed by the processor to enable at least one processor to execute the flexible direct current converter valve detection method for the distribution network.

In addition, a fourth aspect of the embodiments of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the instructions are executed by a processor, the method for detecting a flexible direct current converter valve for a distribution network is implemented.

The embodiment of the invention aims to protect a method and a device for detecting a flexible-straight converter valve for a distribution network, wherein the method comprises the following steps: obtaining the IGBT switching frequency and the capacitance voltage fluctuation rate of the sub-module; judging whether the IGBT switching frequency, the capacitor voltage fluctuation rate and/or the periodic return inspection data are abnormal or not; when the monitoring data is abnormal, the sub-module is judged to be in a sub-health state, a state alarm signal is sent out through the man-machine interaction interface, and the bypass switch of the sub-module is controlled to be closed according to an external control instruction. The technical scheme has the following effects:

whether igbt switching frequency, capacitance voltage fluctuation rate and/or activation periodic return inspection data of the sub-modules are abnormal or not is obtained and judged, so that the requirement of carrying out comprehensive state evaluation on the converter valve on site is met, early warning can be timely carried out on the abnormal sub-modules so as to intervene timely, the corresponding bypass switches are controlled to be closed, and further deterioration of the abnormal sub-modules is avoided.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.