CN114448226B - Sensor redundancy control method and device for cascade bidirectional converter - Google Patents
Sensor redundancy control method and device for cascade bidirectional converter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention provides a sensor redundancy control method and a sensor redundancy control device of a cascade type bidirectional converter device, which relate to the technical field of bidirectional conversion, wherein a total direct-current voltage sensor is arranged on the total direct-current side of a cascade type bidirectional converter module; and under the condition that the AC voltage transformer at the first stage fails, controlling the normal AC voltage transformer to replace the failed AC voltage transformer to judge the AC voltage. The invention can realize the fault redundancy of the main loop sensor only by increasing lower hardware cost, and has simple control strategy and high feasibility.
Description
Technical Field
The invention belongs to the technical field of bidirectional conversion, and particularly relates to a sensor redundancy control method and device of a cascade bidirectional conversion device.
Background
In daily use of the cascade type bidirectional converter, no matter the direct current side and the alternating current side are used, a sensor is arranged at each stage to measure a voltage signal, the control work of the whole device is completed through the display of the voltage signal, the sensor at a certain stage usually fails along with the applicable aging of an instrument, the voltage signal at the stage cannot be detected, the subsequent control loss of the whole cascade type bidirectional converter is caused, and therefore the problem of the sensor fault needs to be found immediately and the fault recovery is carried out.
The main loop sensor fault redundancy strategy of the existing device generally adopts a mode of being equipped with a standby sensor, the standby sensor is required to replace the fault sensor, but the replacement requires disassembling the device for manual replacement, and the maintenance is extremely inconvenient.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention provides a method and a device for controlling sensor redundancy of a cascaded bidirectional converter, so as to solve the above-mentioned technical problems.
In a first aspect, the present invention provides a sensor redundancy control method based on a cascaded bidirectional converter, where the cascaded bidirectional converter includes: the transformer comprises a cascade type bidirectional converter module and a secondary winding traction transformer, wherein the cascade type bidirectional converter module is connected with a direct current power grid in a series connection mode, each stage of direct current side of the cascade type bidirectional converter module is respectively provided with a direct current voltage sensor, the total direct current side of the cascade type bidirectional converter module is respectively provided with a total direct current voltage sensor, and each stage of alternating current side of the cascade type bidirectional converter module is respectively provided with an alternating current voltage transformer; each level of alternating current side of the cascade bidirectional converter module is respectively connected with the secondary winding traction transformer, and the secondary winding of each secondary winding traction transformer is in the same phase;
the sensor redundancy control method comprises the following steps:
under the condition that the primary direct-current voltage sensor has a fault, controlling the total direct-current voltage sensor and all normal direct-current voltage sensors to replace the faulty direct-current voltage sensors to judge the direct-current voltage;
and under the condition that the AC voltage transformer at the first stage fails, controlling a normal AC voltage transformer to replace the failed AC voltage transformer for judging the AC voltage.
Further, the method also comprises the following steps:
acquiring the level direct current voltage of each level of direct current voltage sensor and the total direct current side voltage of the total direct current voltage sensor, and calculating the direct current voltage sum of each level of direct current voltage;
when the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is larger than a direct-current deviation value and each two levels of direct-current voltages are smaller than the direct-current deviation value, judging that the total direct-current voltage sensor is in a fault state;
and judging that the direct-current voltage sensor of the target level has a fault and the direct-current voltage sensor of the non-target level is normal under the condition that the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is larger than the direct-current deviation value, the deviation amount of the level direct-current voltage of the target level and the level direct-current voltage of the non-target level is larger than the direct-current deviation value, and the deviation amount of the level direct-current voltages of every two non-target levels is smaller than the direct-current deviation value.
Further, the method also comprises the following steps:
and acquiring alternating-current voltages of the alternating-current voltage transformers at all levels, and judging that the alternating-current voltage transformer at the target level is in a fault state under the condition that the deviation amount of the alternating-current voltage at the target level and the alternating-current voltage at the non-target level is greater than the alternating-current deviation value and the deviation amount between the alternating-current voltages at all the non-target levels is less than the alternating-current deviation value.
Further, the method also comprises the following steps: and under the condition that the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is smaller than the direct-current deviation value, judging that all the direct-current voltage sensors are in a normal state.
Further, the method also comprises the following steps: and under the condition that the deviation amount of the alternating voltage of each two stages is smaller than the alternating voltage deviation value, judging that all the alternating voltage transformers are in a normal state.
Further, the control of the total dc voltage sensor and all normal dc voltage sensors to replace the faulty dc voltage sensor to determine the dc voltage includes:
the stage dc voltage of the failed dc voltage sensor is replaced by the difference of the total dc side voltage and the normal all stage dc voltage.
Further, the control of replacing the failed ac voltage transformer with the normal ac voltage transformer to perform ac voltage judgment includes: the AC voltage of the failed AC voltage transformer is replaced by the AC voltage of the normal AC voltage transformer.
Further, the cascade type bidirectional converter device is a three-stage series five-group parallel bidirectional converter device.
Further, the direct current deviation value is determined by the total direct current side voltage or the level direct current voltage of all direct current voltage sensors in a normal state;
and the alternating current deviation value is determined by the alternating current voltages of all the alternating current voltage transformers in a normal state.
In a second aspect, the invention provides a sensor redundancy control device based on a cascade type bidirectional converter, which comprises a cascade type bidirectional converter and a main control box;
the main control box utilizes the voltage collected by each stage of direct current voltage sensor and alternating current voltage transformer to participate in control and display, and executes overvoltage, undervoltage and bias protection of the cascade type bidirectional converter.
The invention has the beneficial effects that: only one total direct current voltage sensor is needed to be arranged on the total direct current side of the cascade type bidirectional converter, so that all direct current voltage sensors are redundant mutually, when one direct current voltage sensor fails, the level direct current voltage of the fault level can be replaced by subtracting the normal level direct current voltage from the total direct current side voltage, extra hardware cost is not needed to be added according to the fault redundancy strategy of the alternating current voltage transformer, when one alternating current voltage transformer fails, the level alternating current voltage can be replaced by the next level alternating current voltage to participate in device operation control, and the operation of the whole machine cannot be influenced. Compared with the prior art, the method can realize the fault redundancy of the main loop sensor only by increasing lower hardware cost, and has simple control strategy and high feasibility.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional cascade-type bidirectional converter apparatus according to the present invention.
Fig. 2 is a schematic structural diagram of a cascaded bidirectional converter according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart of a dc voltage sensor fault determination method according to an embodiment of the present invention.
Fig. 4 is a schematic flowchart of a fault determination method for an ac voltage transformer according to an embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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 invention.
The embodiment of the invention provides a sensor redundancy control method of a cascade type bidirectional converter, which comprises the following steps: the transformer comprises a cascade type bidirectional converter module and a secondary winding traction transformer, wherein the cascade type bidirectional converter module is connected with a direct current power grid in a series connection mode, each stage of direct current side of the cascade type bidirectional converter module is respectively provided with a direct current voltage sensor, the total direct current side of the cascade type bidirectional converter module is respectively provided with a total direct current voltage sensor, and each stage of alternating current side of the cascade type bidirectional converter module is respectively provided with an alternating current voltage transformer; each level of alternating current side of the cascade bidirectional converter module is respectively connected with the secondary winding traction transformer, and the secondary winding of each secondary winding traction transformer is in the same phase;
in view of the foregoing structure, this embodiment provides a sensor redundancy control method for a cascaded bidirectional converter device, where the sensor redundancy control method includes:
under the condition that the primary direct-current voltage sensor has a fault, controlling the total direct-current voltage sensor and all normal direct-current voltage sensors to replace the faulty direct-current voltage sensors to judge the direct-current voltage;
and under the condition that the AC voltage transformer at the first stage fails, controlling the normal AC voltage transformer to replace the failed AC voltage transformer to judge the AC voltage.
Optionally, as an embodiment of the present invention, the method further includes: acquiring the level direct current voltage of each level of direct current voltage sensor and the total direct current side voltage of the total direct current voltage sensor, and calculating the direct current voltage sum of each level of direct current voltage; when the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is larger than a direct-current deviation value and the direct-current voltages of each two levels are smaller than the direct-current deviation value, judging that the total direct-current voltage sensor is in a fault state; and judging that the direct-current voltage sensor of the target level has a fault and the direct-current voltage sensor of the non-target level is normal under the condition that the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is larger than the direct-current deviation value, the deviation amount of the level direct-current voltage of the target level and the level direct-current voltage of the non-target level is larger than the direct-current deviation value, and the deviation amount of the level direct-current voltages of every two non-target levels is smaller than the direct-current deviation value.
Optionally, as an embodiment of the present invention, the method further includes: and acquiring alternating-current voltages of the alternating-current voltage transformers at all levels, and judging that the alternating-current voltage transformer at the target level is in a fault state under the condition that the deviation amount of the alternating-current voltage at the target level and the alternating-current voltage at the non-target level is greater than the alternating-current deviation value and the deviation amount between the alternating-current voltages at all the non-target levels is less than the alternating-current deviation value.
Optionally, as an embodiment of the present invention, the method further includes: and under the condition that the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is smaller than the direct-current deviation value, judging that all the direct-current voltage sensors are in a normal state.
Optionally, as an embodiment of the present invention, the method further includes: and under the condition that the deviation amount of the alternating voltage of each two stages is smaller than the alternating voltage deviation value, judging that all the alternating voltage transformers are in a normal state.
Optionally, as an embodiment of the present invention, the controlling, instead of the faulty dc voltage sensor, the total dc voltage sensor and all normal dc voltage sensors to determine the dc voltage includes: the stage dc voltage of the failed dc voltage sensor is replaced by the difference of the total dc side voltage and the normal all stage dc voltage.
Optionally, as an embodiment of the present invention, the controlling to perform the judgment of the ac voltage by replacing the failed ac voltage transformer with a normal ac voltage transformer includes: the AC voltage of the failed AC voltage transformer is replaced by the AC voltage of the normal AC voltage transformer.
Optionally, as an embodiment of the present invention, the cascaded bidirectional converter device is a three-stage series connection five groups of bidirectional converter devices connected in parallel.
Optionally, as an embodiment of the present invention, the dc offset value is determined by the total dc-side voltage or the stage dc voltage of all dc voltage sensors in a normal state; and the alternating current deviation value is determined by the alternating current voltages of all the alternating current voltage transformers in a normal state.
In order to facilitate understanding of the present invention, the sensor redundancy control method for the cascaded bidirectional converter device provided by the present invention is further described below by using the principle of the sensor application of the cascaded bidirectional converter device of the present invention and combining with the improved structure of the cascaded bidirectional converter device in the embodiment.
Fig. 1 shows a three-stage cascade type bidirectional converter topology. The three-stage cascade type bidirectional converter device comprises five groups of three-stage series-connection parallel bidirectional converter modules and a secondary side three-winding traction transformer; the bidirectional converter module is connected with a direct current power grid in a three-stage series connection mode, a direct current voltage sensor is arranged on each stage of direct current side to collect the direct current voltage of the stage to participate in control, and the total number of the three direct current voltage sensors is three; each stage of alternating current side is formed by connecting five bidirectional converter modules in parallel, each stage is provided with two alternating voltage transformers, 6 alternating voltage transformers are provided in total, and each alternating voltage transformer collects the alternating voltage of the stage in a V/V connection mode and participates in control.
FIG. 2 is a graph illustrating a primary loop sensor profile after adding fault redundancy measures. Only one total direct current voltage sensor is needed to be arranged on the total direct current side of the three-level cascade type bidirectional converter, at the moment, four direct current voltage sensors are mutually redundant, when one direct current voltage sensor fails, the failed level direct current voltage can be replaced by the level direct current voltage obtained by subtracting the normal two levels from the total direct current side voltage to participate in the operation control of the device, and the normal operation of the bidirectional converter can not be influenced; the alternating current voltage transformer fault redundancy strategy does not need to additionally increase hardware cost, when the alternating current voltage transformer of one stage breaks down, the alternating current voltage of the stage can be replaced by the alternating current voltage of the next stage to participate in device operation control, and the normal operation of the bidirectional alternating current device cannot be influenced.
In view of the improvement of the above structure, this embodiment provides a sensor redundancy control method for a cascaded bidirectional converter device, where the sensor redundancy control method includes:
as shown in fig. 3, when the primary dc voltage sensor fails, the total dc voltage sensor and all normal dc voltage sensors are controlled to replace the failed dc voltage sensor to determine the dc voltage; the method comprises the following specific steps:
and acquiring the stage direct current voltage of each stage of direct current voltage sensor and the total direct current side voltage of the total direct current voltage sensor, and calculating the direct current voltage sum of the stage direct current voltage of each stage.
And under the condition that the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is smaller than the direct-current deviation value, judging that the four direct-current voltage sensors are in a normal state. The DC offset value
The preset percentage is set to be 10% determined by the total DC side voltage or the stage DC voltage of all the DC voltage sensors in the normal state, namely the DC voltage sensors are set to be the stage DC voltage
Or is or
. Logic for judging normal state of DC voltage sensorFormula (1) shows:
wherein the content of the first and second substances,
the total dc side voltage of the total dc voltage sensor,
is the stage dc voltage of the dc voltage sensor of the first stage,
is the stage dc voltage of the dc voltage sensor of the second stage,
is the stage dc voltage of the dc voltage sensor of the third stage,
is the DC offset value.
Under the condition that the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is larger than the direct-current deviation value and each two-level direct-current voltage is smaller than the direct-current deviation value, judging that the total direct-current voltage sensor is in a fault state; in the three-level cascade type bidirectional converter device in the embodiment, the total direct-current voltage sensor is judged to be in a fault state according to the following formula; the logic for determining that the total dc voltage sensor is faulty is shown in equation (2):
wherein the content of the first and second substances,
the total dc side voltage of the total dc voltage sensor,
is the stage dc voltage of the dc voltage sensor of the first stage,
is the stage dc voltage of the dc voltage sensor of the second stage,
is the stage dc voltage of the dc voltage sensor of the third stage,
is the DC offset value.
After the total direct-current voltage sensor is judged to be in fault, the total sum of the level direct-current voltages collected by each level of direct-current voltage sensor is used for replacing the total sum of the level direct-current voltages, and the total sum of the level direct-current voltages participates in the operation control of the device, so that the operation of the whole machine cannot be influenced under the condition.
And under the condition that the deviation amount of the total DC side voltage and the sum of the DC voltages is greater than the DC deviation value, the deviation amount of the level DC voltage of the target level and the level DC voltage of the non-target level is greater than the DC deviation value, and the deviation amount of the level DC voltages of every two non-target levels is less than the DC deviation value, judging that the DC voltage sensor of the target level has faults, and the DC voltage sensors of the non-target levels are normal. The logic for determining that a certain level of direct current voltage sensor has a fault is shown in formula (3):
wherein the content of the first and second substances,
the total dc side voltage of the total dc voltage sensor,
is the stage dc voltage of the dc voltage sensor of the first stage,
is the stage dc voltage of the dc voltage sensor of the second stage,
is the stage dc voltage of the dc voltage sensor of the third stage,
is the DC offset value.
In addition, the stage direct-current voltage of the failed direct-current voltage sensor is replaced by the difference value of the total direct-current side voltage and the normal all-stage direct-current voltage, the direct-current voltage is involved in device control and display, and overvoltage and undervoltage protection of the device is normally executed.
As shown in fig. 4, in the case where the primary ac voltage transformer fails, the normal ac voltage transformer is controlled to replace the failed ac voltage transformer to determine the ac voltage.
And under the condition that the deviation amount of the alternating voltage of each two stages is smaller than the alternating voltage deviation value, judging that all the alternating voltage transformers are in a normal state. The value of the AC deviation
The preset percentage is set to be 10% determined by the alternating voltages of all the alternating voltage transformers in the normal state, namely the alternating voltages are set to be the alternating voltages of all the alternating voltage transformers in the normal state
. The logic for judging the normal state of the alternating-current voltage transformer is shown as a formula (4):
And acquiring alternating-current voltages of all levels of alternating-current voltage transformers, and judging that the alternating-current voltage transformers of the target level are in a fault state under the condition that the deviation amount of the alternating-current voltages of the target level and the alternating-current voltages of the non-target level is greater than the alternating-current deviation value and the deviation amount between the alternating-current voltages of all the non-target levels is smaller than the alternating-current deviation value. The logic for judging the fault of a certain level of alternating current voltage transformer is shown as a formula (5):
the AC voltage of the fault AC voltage transformer is replaced by the stage DC voltage of the normal AC voltage transformer, participates in the control and display of the device, and normally executes the overvoltage and undervoltage protection of the device.
In the device of the embodiment, because the three secondary side windings of the transformer are in the same phase, when one of the two alternating-current voltage transformers fails, the amplitude and phase angles of the other two stages can be used for participating in the control.
The embodiment of the invention also provides a sensor redundancy control device based on the cascade type bidirectional converter, which comprises a cascade type bidirectional converter and a main control box; the main control box utilizes the voltage collected by each stage of direct current voltage sensor and alternating current voltage mutual inductor to participate in control and display, and normally executes overvoltage, undervoltage and bias protection of the cascade type bidirectional converter.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A sensor redundancy control method of a cascade type bidirectional converter is characterized by comprising the following steps: the transformer comprises a cascade type bidirectional converter module and a secondary winding traction transformer, wherein the cascade type bidirectional converter module is connected with a direct current power grid in a series connection mode, each stage of direct current side of the cascade type bidirectional converter module is respectively provided with a direct current voltage sensor, the total direct current side of the cascade type bidirectional converter module is respectively provided with a total direct current voltage sensor, and each stage of alternating current side of the cascade type bidirectional converter module is respectively provided with an alternating current voltage transformer; each level of alternating current side of the cascade bidirectional converter module is respectively connected with the secondary winding traction transformer, and the secondary winding of each secondary winding traction transformer is in the same phase;
the sensor redundancy control method comprises the following steps:
under the condition that the primary direct-current voltage sensor fails, controlling the total direct-current voltage sensor and all normal direct-current voltage sensors to replace the failed direct-current voltage sensors to judge direct-current voltage;
and under the condition that the AC voltage transformer at the first stage fails, controlling the normal AC voltage transformer to replace the failed AC voltage transformer to judge the AC voltage.
2. The method of claim 1, further comprising:
acquiring the level direct current voltage of each level of direct current voltage sensor and the total direct current side voltage of the total direct current voltage sensor, and calculating the direct current voltage sum of each level of direct current voltage;
when the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is larger than a direct-current deviation value and each two levels of direct-current voltages are smaller than the direct-current deviation value, judging that the total direct-current voltage sensor is in a fault state;
and under the condition that the deviation amount of the total direct current side voltage and the sum of the direct current voltages is larger than the direct current deviation value, the deviation amount of the level direct current voltage of the target level and the level direct current voltage of the non-target level is larger than the direct current deviation value, and the deviation amount of the direct current voltages of every two non-target levels is smaller than the direct current deviation value, judging that the direct current voltage sensor of the target level has faults, and the direct current voltage sensor of the non-target level is normal.
3. The method of claim 1, further comprising:
and acquiring alternating-current voltages of the alternating-current voltage transformers at all levels, and judging that the alternating-current voltage transformer at the target level is in a fault state under the condition that the deviation amount of the alternating-current voltage at the target level and the alternating-current voltage at the non-target level is greater than the alternating-current deviation value and the deviation amount between the alternating-current voltages at all the non-target levels is less than the alternating-current deviation value.
4. The method of claim 2, further comprising: under the condition that the deviation amount of the total direct-current side voltage and the sum of the direct-current voltages is smaller than the direct-current deviation value, judging that all direct-current voltage sensors are in a normal state;
the direct current deviation value is determined by the total direct current side voltage or the level direct current voltage of all direct current voltage sensors in a normal state.
5. The method of claim 3, further comprising: under the condition that the deviation amount of the alternating voltage of each two stages is smaller than the alternating voltage deviation value, judging that all the alternating voltage transformers are in a normal state;
and the alternating current deviation value is determined by the alternating current voltages of all the alternating current voltage transformers in a normal state.
6. The method of claim 2, wherein said controlling the determination of the dc voltage by the total dc voltage sensor and all normal dc voltage sensors in place of the failed dc voltage sensor comprises:
the stage dc voltage of the failed dc voltage sensor is replaced by the difference of the total dc side voltage and the normal all stage dc voltage.
7. The method of claim 1, wherein said controlling the determination of the ac voltage by a normal ac voltage transformer instead of a failed ac voltage transformer comprises:
the AC voltage of the failed AC voltage transformer is replaced by the AC voltage of the normal AC voltage transformer.
8. The method as claimed in claim 1, wherein the cascaded bidirectional converters are three-stage series five groups of parallel bidirectional converters.
9. A sensor redundancy control device based on a cascaded bidirectional converter, characterized by comprising the cascaded bidirectional converter and a master control box as claimed in claim 1;
the main control box utilizes the voltage collected by each stage of direct current voltage sensor and alternating current voltage transformer to participate in control and display, and executes overvoltage, undervoltage and bias protection of the cascade type bidirectional converter.
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| KR101309287B1 (en) * | 2012-01-31 | 2013-09-16 | 아주대학교산학협력단 | Apparatus and method for a fault diagnosis of direct current terminal voltage sensor of grid connected power transformer and fault-tolerant control |
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