KR20100050159A - Apparatus and computer readable storage medium for processing method of continuous operation by decreasing capacity - Google Patents

Apparatus and computer readable storage medium for processing method of continuous operation by decreasing capacity Download PDF

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Publication number
KR20100050159A
KR20100050159A KR1020080109303A KR20080109303A KR20100050159A KR 20100050159 A KR20100050159 A KR 20100050159A KR 1020080109303 A KR1020080109303 A KR 1020080109303A KR 20080109303 A KR20080109303 A KR 20080109303A KR 20100050159 A KR20100050159 A KR 20100050159A
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South Korea
Prior art keywords
inverter
switch unit
continuous operation
unit
switching element
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KR1020080109303A
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Korean (ko)
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박일우
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삼성중공업 주식회사
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Publication of KR20100050159A publication Critical patent/KR20100050159A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1227—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the output circuit, e.g. short circuit
    • 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
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention relates to a recording medium readable by an electronic device implementing the derating continuous operation apparatus and method. According to one aspect of the present invention, there is disclosed a rating reduction continuous operation apparatus of an inverter for driving an electric motor with a three-phase current. Derating continuous operation apparatus according to an embodiment of the present invention is a controller unit for detecting a fault switching element of the inverter by monitoring the output current value of the inverter applied to the motor, and controls the switching element of the inverter, It consists of a plurality of switching elements that are switched by receiving a control signal from the controller unit and the switch unit for applying a three-phase current to the motor and when one or more switching elements in the switch unit has a failure, the three instead of the switch unit It includes a bypass switch unit for bypassing the phase current (Bypass).

Description

Apparatus and computer readable storage medium for processing method of continuous operation by decreasing capacity}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium that can be read by an electronic device that executes a reduced rated continuous operation device and method, and more particularly, to a reduced rated continuous operation device and method capable of continuously operating when a failure of an NPC three-level inverter occurs. An electronic device is readable from a recording medium.

An inverter is a device which converts DC (direct current) into AC (AC) and is used to control an electric motor.

Typically, NPC (Neutral Point Clamped) three-level inverters are used to variable speed high-voltage large-capacity motors. This NPC three-level inverter is composed of a plurality of switching elements. Therefore, the NPC three-level inverter according to the prior art has a problem that it is difficult to find a fault switch in the absence of a function for detecting the position of the fault switch, if one or more switches fail, a lot of time and cost is required.

High-capacity inverters with variable-speed motors with variable capacity require continuous operation even if a switching device fails. Therefore, the large-capacity inverter must perform continuous operation even if the rating is lowered before replacing the switching element due to the failure of the switching element.

However, the NPC three-level inverter according to the prior art has a problem in that continuous operation cannot be performed when a switching device fails.

The present invention is to solve the above problems of the prior art, it is an object to find a fault switch in the case of a switch failure in the NPC three-level inverter, and to enable the continuous operation of the product until the fault switch is replaced .

According to one aspect of the present invention, there is disclosed a rating reduction continuous operation apparatus of an inverter for driving an electric motor with a three-phase current.

Derating continuous operation apparatus according to an embodiment of the present invention is a controller unit for detecting a fault switching element of the inverter by monitoring the output current value of the inverter applied to the motor, and controls the switching element of the inverter, It consists of a plurality of switching elements that are switched by receiving a control signal from the controller unit and the switch unit for applying a three-phase current to the electric motor and when one or more switching elements in the switch unit has a failure, in place of the switch unit It includes a bypass switch unit for bypassing the three-phase current (Bypass).

According to another aspect of the present invention, a recording medium readable by an electronic device that executes the derating continuous operation method performed by the derating continuous operation apparatus is disclosed.

The recording medium readable by the electronic device according to an embodiment of the present invention measures the three-phase output current value of the inverter to determine whether the failure, and determining the fault switching device using the three-phase output current value In addition to the faulty switching device, a method for reducing a continuous operation including opening a remaining switching device and operating a bypass switch is performed.

The present invention has the effect of allowing continuous operation even in the event of a switching element failure of an NPC three-level inverter.

In addition, the present invention has the effect that it is easy to find the fault switch of the NPC three-level inverter without additional time and cost.

In addition, the present invention has the effect of improving the reliability of the device including the NPC three-level inverter.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is a diagram illustrating a motor control apparatus, and FIG. 1B is a diagram illustrating a measurement waveform of an output current of an NPC three-level inverter. More specifically, FIG. 1A illustrates a power circuit diagram of an NPC three level inverter and a motor and a relationship between the NPC three level inverter and the controllers.

Hereinafter, the NPC three-level inverter outputs three-phase current to drive and vary the motor. Here, referring to FIG. 1C, harmonics of the output current can be lowered and the influence of reflected waves can be reduced as compared with the existing two-level PWM inverter with voltage levels of inverter output line voltages of 0, VDC / 2, and VDC. In addition, the three phase currents are currents in which each of the three currents has a phase difference of 120 degrees. The frequency and magnitude of the three phase currents vary depending on the load torque or the command speed.

First, referring to FIG. 1A, a motor control apparatus including an NPC three-level inverter includes a main controller 10, a switch unit 20, an inverter controller 30, an electric motor 40, an optical communication line 50, and a current converter. (CT: Current Transformer) 70, the clamping diode unit 80, DC link unit 90 may be configured.

 The main controller 10 monitors the voltage value applied to each of the two capacitors 91 and 92 of the DC link unit 90, the output current value measured by the current converter 70, and the torque value of the motor 40. do. The main controller 10 transmits the command voltage and frequency information to the inverter controller 30 according to the measured value so as to control each switching element of the inverter. At this time, the main controller 10 and the inverter controller 30 transmits and receives information using the optical communication line 50. Thus, the main controller 10 may drive and vary the speed of the electric motor 40 by controlling the power and torque of the electric motor 40.

In addition, the main controller 10 may be a computer terminal device including a CPU unit, an I / O processing unit, an optical conversion unit, and the like, and a user may control the electric motor control device using the main controller 10.

The inverter controller 30 may communicate with the main controller 10 through the optical communication line 50, and receive command voltage and frequency information from the main controller 10 to control each switching element of the switch unit 20. . In this case, the inverter controller 30 may control each switching element by transmitting a control signal to the gate control unit (FIG. 3D) installed in each switching element of the switch unit 20. Here, the gate control unit (FIG. 3D) is connected to the gate 23 of each switching element to directly control the switching element.

The switch unit 20 includes a total of twelve switching elements, and each of the switching elements can be properly turned off to drive the electric motor 40. Each switching element may be composed of an Insulated Gate Bipolar Transistor (IGBT) 21 and a freewheeling diode 22. Here, the IGBT 21 receives a control signal from the gate control unit (FIG. 3D) through the gate 23 to perform an on-off operation. The freewheeling diode 22 operates to flow a current in one direction.

Each switching element of the switch unit 20 may have three phases of u, v, and w, and may be composed of four switching elements for each phase. The bundle of switching elements in each phase is called a leg, and the legs of the NPC three-level inverter may be composed of a total of four switching elements.

The motor 40 operates with three-phase current and is a high voltage large capacity motor. The motor 40 operates by receiving an output voltage of three phases of the NPC three-level inverter.

The current converter 70 is installed between the NPC three-level inverter and the motor 40, and measures the instantaneous value of the current input to the motor 40. The instantaneous value of the measured current is transmitted to the main controller 10 to be used for calculating the rotor position of the motor, detecting overcurrent, and detecting a failure point of the switching element.

The clamping diode unit 80 provides a path through which current flows when only the inner switching element of the switch unit 20 operates. The inner switching elements are Su 2 , Su 3 , Sv 2 , Sv 3 , Sw 2 , Sw 3 , and the outer switching elements are Su 1 , Su 4 , Sv 1 , Sv 4 , Sw 1 , Sw 4 .

The DC link unit 90 is configured by connecting an upper capacitor C U 91 and a lower capacitor C L 92 which are high voltage capacitors in series. The DC link portion 90 has a neutral point 93, which is located between the upper capacitor C U 91 and the lower capacitor C L 92. The DC link unit 90 may be connected to the DC power supply 1 at both ends, and the upper capacitor C U 91 and the lower capacitor C L 92 may have the same voltage to achieve voltage balance. The main controller 10 may always detect voltage rise and neutral point 93 imbalance by measuring voltage values of the upper capacitor C U 91 and the lower capacitor C L 92, respectively.

Referring to FIG. 1B, FIG. 1B shows a waveform of the output current of the NPC three level inverter of FIG. 1A. (A) shows the waveform of three-phase output current of the same magnitude with phase difference. (A) is a waveform when the switching elements of the switch unit 20 operate normally.

(B) shows that the upper part of one phase (U phase) current waveform is not output. (B) is the waveform of the output current which is output when Su 2 is opened by failure. That is, when Su 2 is opened due to a failure, the current does not flow at all to the upper parts Su 1 and Su 2 of the switch part 20, but the lower parts Su 3 and Su 4 of the switch part 20. Will flow only.

(C) shows that the lower part of one phase (U phase) current waveform is not output. (C) shows the waveform of output current when Su 3 is opened due to fault. That is, when Su 3 is opened due to a failure, the current does not flow at all to the lower portions Su 3 and Su 4 of the switch unit 20, but the upper portions Su 1 and Su 2 of the switch unit 20. Will flow only.

2 shows a three-level spatial vector diagram. More specifically, FIG. 2 is a diagram illustrating a vector diagram used to make a switching pattern of the switch unit 20 of the NPC three-level inverter of FIG. 1A.

The method using the vector diagram determines a target voltage vector for producing the target speed or torque of the motor, determines which region of the vector diagram is located in the vector diagram, and determines the target voltage vector to operate the inverter with the switching pattern of the region where the target voltage vector is located. To drive. In Fig. 2, the switching pattern is represented by (PNO), (PNP), (PPN) and the like. Here, the three alphabet letters correspond to the U, V, and W phases from the left.

For example, referring to Table 1 below, Table 1 below shows the switching status of Su 1 , Su 2 , Su 3 , Su 4 . That is, the symbol "P" indicates the switching state of Su 1 to Su 4 "ON, ON, OFF and OFF", respectively. The correspondence between the symbols in Table 1 and the switching states also applies to the switching elements Sv 1 to Sv 4 and Sw 1 to Sw 4 .

Switching function Sx (x = a, b, c) Switching state Pole voltage sign SU1 SU2 SU3 SU4 2 ON ON OFF OFF + VDC / 2 P One OFF ON ON OFF 0 O 0 OFF OFF ON ON -VDC / 2 N

Thus, when the switching pattern is (PNN), Su 1 to Su 4 become "ON, ON, OFF, OFF", Sv 1 to Sv 4 become "OFF, OFF, ON, ON", and Sw 1 to Sw 4 becomes "OFF, OFF, ON, ON". In this switching pattern, the current flows from the U phase to the motor 40 and flows from the motor 40 to the V phase and the W phase.

Figure 3a is a view showing a derating continuous operation apparatus according to an embodiment of the present invention, Figure 3b is a view showing the reference numeral 60 of Figure 3a according to an embodiment of the present invention, Figure 3c is a view of the present invention A diagram showing measurement waveforms of an output current of an NPC three-level inverter according to an embodiment.

More specifically, FIG. 3A illustrates a power circuit diagram of an NPC three level inverter and a motor including a bypass switch and a relationship between the NPC three level inverter and the controllers. Hereinafter, descriptions of components and operations overlapping with those of FIG. 1A will be omitted.

Referring to FIG. 3A, the rated reduction continuous operation apparatus including the NPC three-level inverter according to the present invention includes a main controller 10, a switch unit 20, an inverter controller 30, an electric motor 40, and an optical communication line 50. ), A bypass switch unit 60, a current transformer (CT) 70, a clamping diode unit 80, and a DC link unit 90.

3A and 3B, the bypass switch unit 60 may connect the neutral point 93 and the electric motor 40 to make a passage of current. The bypass element of the bypass switch unit 60 forms a passage through which current in three phases can flow in both directions. The bypass device may use a thyristor arranged as shown in FIG. 3B. In addition, the bypass device may use a contactor.

The main controller 10 controls the switching pattern of the bypass switch unit 60 so as to generate a balanced current of three phases. The master controller 10 monitors the instantaneous value of the current measured in the current transducer 70. Thus, when the failure of the switching element is detected, the main controller 10 opens the remaining switching elements in addition to the fault switching element, and operates the bypass switch unit 60 to operate the motor 40 and the neutral point 93. Form a current path between them. At this time, the main controller 10 controls the bypass switch unit 60 so that a balanced current of three phases is generated.

Referring to FIG. 3c, FIG. 3c shows a measurement waveform of the output current of the NPC three level inverter according to the present invention. (A) shows the waveform of the output current when all the switching elements of the switch unit 20 operates normally. (B) shows the waveform of the current output by operating the bypass switch unit 60 when one or more switching elements fail and open.

Here, when comparing the output waveforms of (a) and (b), the waveform of (b) is smaller in width than the waveform of (a). This is because, when the electric motor 40 is driven using the bypass switch unit 60, the rating is decreased and continuous operation is performed. In the reduced rated continuous operation device according to the present invention, the effective value of the current is reduced by controlling the bypass switch unit 60 to produce a balanced three-phase current.

4 is a view for explaining a method for detecting a faulty switching element of the derating continuous operation apparatus according to an embodiment of the present invention. In more detail, Figure 4 is a DQ conversion diagram according to the output voltage value of the rated derating continuous operation device. Here, the DQ conversion degree shows an inherent shape as each switching element is opened.

Referring again to FIG. 3A, the master controller 10 monitors the output current value measured by the current transducer 70. The main controller 10 may determine the imbalance of the three-phase current according to the measured output current value and control the respective switching elements of the switch unit 20.

Here, the fixed current DQ is converted into the output current value by the following equation.

Figure 112008076670312-PAT00001

Here, i a , i b , i c are output values of three phases, I d , I q are fixed coordinate DQ conversion values, and θ r is the position of the rotor. To convert to fixed coordinates, θ r is controlled to zero.

Referring to FIG. 4, FIG. 4 is a graph in which the output current value is fixed-coordinate DQ-converted by Equation 1 and I d is a value on the x-axis and I q is a value on the y-axis.

First, (A) shows that when the NPC three-level inverter according to the present invention operates normally, the DQ conversion degree appears in a circular shape. The DQ conversion diagram that appears in a circular shape is shown by graphing three-phase currents having the same phase difference and having the same magnitude, and performing fixed-coordinate DQ conversion.

(B) shows DQ conversion diagram when Su 2 is open. (B) forms the shape of a semicircle without the right side. (C) shows DQ conversion diagram when Su 3 is open. (C), in contrast to (B), forms a semicircle with no left. (D) is a DQ conversion diagram that appears when Su 1 is opened. (D) is a semicircle that protrudes slightly to the right.

Although not shown in the drawing, the diagram of DQ conversion when Su 4 is opened is shown in the right part as shown in (D).

(E) is a DQ conversion diagram that appears when Sv 2 is open. (E) is (B) rotated 120 degrees counterclockwise.

(Bar) is a DQ conversion diagram that appears when Sw 2 is opened. (Bar) is the shape which rotated (e) 120 degree counterclockwise.

So, Sv 1 DQ conversion degree when Sv 4 is open respectively is Su 1 SQ 1 is rotated 120 degrees counterclockwise when Su 4 is open, Sw 1 When Sw 4 is open, DQ conversion degree is Sv 1 The DQ conversion degree when Sv 4 is opened is rotated 120 degrees counterclockwise.

5 is a flowchart illustrating a method of continuously decreasing a rating according to an embodiment of the present invention.

Hereinafter, in order to facilitate the understanding and explanation of the present invention, a description will be given mainly of the reduced rating continuous operation apparatus.

Referring to Figure 5, first, the derating continuous operation device detects the occurrence of the overcurrent trip (S510). In other words, the rating reduction continuous operation device receives the current value of the three phases measured by the current converter 70 and determines that the current value exceeds the limit value as an error.

Subsequently, when the overcurrent trip occurs, the derating continuous operation device stops and restarts the NPC three-level inverter urgently (S520). This is to determine whether the occurrence of the overcurrent trip is caused by a momentary overload or a failure of the switching element.

Subsequently, the derating continuous operation device measures the three-phase output current value of the NPC three-level inverter after restarting (S530) to determine whether the inverter is broken (S540). Measurement of the output current value is made by the current converter 70, the main controller 10 receives the measured output current value to determine the failure of the inverter by detecting the unbalance of the three-phase current. Here, when the main controller 10 has a problem due to the failure of the inverter, the main controller 10 may display the failure details and the failure location.

Subsequently, the derating continuous operation apparatus determines a failure switching element (S550). The determination of the fault switching element uses the DQ conversion diagram of FIG. 4. The DQ conversion diagram may be generated by graphing the DQ conversion coordinate value calculated by substituting the output current value in Equation 1. As described above with reference to FIG. 4, the DQ conversion diagram is different depending on the failure of each switching element of the switch unit 20 of the NPC three-level inverter. Thus, the fault switching element can be detected according to the shape of the DQ conversion degree.

Subsequently, the derating continuous operation apparatus opens the remaining switching elements except for the detected switching elements (560). That is, the derating continuous operation device stops the function of the switch unit 20 when one or more switching elements of the switch unit 20 fail.

Subsequently, the derating continuous operation device operates the bypass switch (S570). The derating continuous operation device performs a role of passage of current in place of the switch unit 20 using a bypass switch. The main controller 10 appropriately controls the switching pattern of the bypass switch so that a balanced current of three phases is generated. Therefore, when the switching element fails, the derating continuous operation device can perform continuous operation by decreasing the rating without stopping.

The derating continuous operation method according to the embodiment of the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like.

The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention, or may be known and available to those skilled in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Hardware devices specially configured to store and execute program instructions such as magneto-optical media and ROM, RAM, flash memory and the like. In addition, the above-described medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

1A is a view showing a motor control device.

1B is a diagram showing a measurement waveform of an output current of an NPC three-level inverter.

1C is a diagram showing output line voltage and fundamental wave components of an NPC three-level inverter.

2 shows a three level spatial vector diagram;

Figure 3a is a view showing a reduced rating continuous operation apparatus according to an embodiment of the present invention.

FIG. 3B is a diagram showing reference numeral 60 of FIG. 3A in accordance with an embodiment of the present invention.

Figure 3c is a view showing a measurement waveform of the output current of the NPC three-level inverter according to an embodiment of the present invention.

Figure 3d is a view showing a gate control unit according to an embodiment of the present invention.

4 is a view for explaining a faulty switching element detection method of the derating continuous operation apparatus according to an embodiment of the present invention.

5 is a flowchart illustrating a method for continuously decreasing a rating according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: main controller 20: switch unit

30: inverter controller 40: electric motor

50: optical communication line 60: bypass switch unit

70: current transducer 80: clamping diode

90: DC link part

Claims (10)

In the continuous operation device of the reduced rating of the inverter for driving the motor with three-phase current, A controller unit which monitors an output current value of the inverter applied to the motor, detects a faulty switching element of the inverter, and controls a switching element of the inverter; A switch unit configured to receive a control signal from the controller unit and to be switched to apply a three-phase current to the motor; And And a bypass switch unit configured to bypass the three-phase current in place of the switch unit when one or more switching elements fail in the switch unit. The method of claim 1, The bypass switch unit is a rating reduction continuous operation device, characterized in that consisting of a bypass element for flowing three-phase current in each direction. The method of claim 1, And the bypass switch unit is positioned between the neutral point of the DC link unit and the motor, and the DC link unit is configured of an upper capacitor and a lower capacitor connected in series to form the neutral point in the middle. The method of claim 1, And a current converter unit output from the switch unit to measure an instantaneous value of the three-phase current applied to the motor and transmit the measured instantaneous value to the controller unit. The method according to claim 1 or 4, And the controller unit receives an instantaneous value of three-phase current from the current converter unit and detects a faulty switching element in the switch unit. The method of claim 5, When the controller detects the faulty switching element, all remaining switching elements are opened, and the bypass switch unit operates the bypass switching unit to bypass three-phase current. The method of claim 5, And the controller unit converts the instantaneous value of the three-phase current to a fixed coordinate DQ to calculate a DQ conversion degree, and detects a faulty switching element according to the shape of the DQ conversion degree. The method of claim 1, And the inverter is an NPC three-level inverter. In a recording medium readable by an electronic device which executes a derating continuous operation method performed by a derating continuous operation apparatus, Determining whether or not a fault is measured by measuring a three-phase output current value of the inverter; Determining a fault switching device using the three-phase output current value; Opening a remaining switching element in addition to the faulty switching element; And A readable recording medium of an electronic device which executes a derating continuous operation method comprising operating a bypass switch. 10. The method of claim 9, Before the step of determining whether the fault by measuring the three-phase output current value of the inverter And a step of stopping the inverter suddenly and restarting the over-current trip by measuring the three-phase output current value of the inverter.
KR1020080109303A 2008-11-05 2008-11-05 Apparatus and computer readable storage medium for processing method of continuous operation by decreasing capacity KR20100050159A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101331028B1 (en) * 2012-05-24 2013-11-19 아주대학교산학협력단 Fault switch diagnosis apparatus and method of 3 level t type inverter
KR101436562B1 (en) * 2013-04-11 2014-09-03 주식회사 브이씨텍 Emergency driving method of inverter for electric vehicle
KR20200140052A (en) * 2019-06-05 2020-12-15 한국전자기술연구원 Control device, system for induction motor capable of emergency operation and driving method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101331028B1 (en) * 2012-05-24 2013-11-19 아주대학교산학협력단 Fault switch diagnosis apparatus and method of 3 level t type inverter
KR101436562B1 (en) * 2013-04-11 2014-09-03 주식회사 브이씨텍 Emergency driving method of inverter for electric vehicle
CN104969459A (en) * 2013-04-11 2015-10-07 株式会社Vctech Emergency inverter operation device for electric vehicle and method therefor
KR20200140052A (en) * 2019-06-05 2020-12-15 한국전자기술연구원 Control device, system for induction motor capable of emergency operation and driving method thereof

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