WO2017154308A1 - Dispositif de commande de conversion d'énergie, système de conversion d'énergie, et programme - Google Patents

Dispositif de commande de conversion d'énergie, système de conversion d'énergie, et programme Download PDF

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Publication number
WO2017154308A1
WO2017154308A1 PCT/JP2016/087841 JP2016087841W WO2017154308A1 WO 2017154308 A1 WO2017154308 A1 WO 2017154308A1 JP 2016087841 W JP2016087841 W JP 2016087841W WO 2017154308 A1 WO2017154308 A1 WO 2017154308A1
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Prior art keywords
power conversion
diagnosis
conversion device
unit
capacitor
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PCT/JP2016/087841
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English (en)
Japanese (ja)
Inventor
輝 米川
泰明 乗松
充弘 門田
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株式会社日立製作所
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Publication of WO2017154308A1 publication Critical patent/WO2017154308A1/fr

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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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

Definitions

  • the present invention relates to a power conversion control device, a power conversion system, and a program.
  • Patent Document 1 states that “in a plurality of power conversion devices that are connected in parallel to an output bus and perform parallel operation control so that the output voltage and the output phase coincide with each other, The converters are separated from the output buses one by one, and means for operating in parallel with the standby power source using the parallel operation control function is provided, and the parallel operation is performed while the power converter device and the standby power source are operating in parallel. Power conversion device that can check and diagnose control functions "(see abstract).
  • Patent Document 1 since a plurality of power converters are operated in parallel, it is easy to perform inspection or diagnosis by disconnecting one power converter. However, when a desired voltage is obtained by connecting a plurality of power converters in series, it is difficult to disconnect the power converter to be inspected or diagnosed while continuing to supply power to the load device. there were.
  • the present invention has been made in view of the above-described circumstances, and an object thereof is to provide a power conversion control device, a power conversion system, and a program that can easily perform inspection or diagnosis of power converters connected in series. .
  • a diagnosis target selection unit that selects one of the plurality of power conversion devices connected in series as the power conversion device for diagnosis.
  • a diagnostic unit for performing diagnosis on the diagnostic target power converter, and changing the output voltage of the diagnostic target power converter with the diagnosis, and changing the output voltage of the diagnostic target power converter In addition, an output setting unit that changes the output voltage of the power converter other than the diagnosis target power converter is provided.
  • FIG. 1 is a block diagram of a power conversion system according to an embodiment of the present invention. It is a block diagram of a cell converter. It is a flowchart of a capacitor diagnosis main routine. It is a flowchart of a capacitor diagnosis subroutine. It is a wave form diagram of each part at the time of capacitor diagnosis. It is a flowchart of an element diagnosis subroutine. It is a wave form diagram of each part at the time of element diagnosis. It is a wave form diagram of each part at the time of the capacitor diagnosis of a modification.
  • FIG. 1 is a block diagram of a power conversion system 1 according to an embodiment of the present invention.
  • the power conversion system 1 includes N (N is a plurality) cell converters 30-1, 30-2,..., 30-N (power converters) (hereinafter may be collectively referred to as “cell converter 30”).
  • a control device 10 control device for power conversion for controlling them.
  • Each cell converter 30 is connected in parallel to a power supply device 20 (power supply) which is a DC power supply, and converts the supplied DC voltage into a single-phase AC voltage and outputs the same.
  • power supply device 20 power supply
  • the power supply device 20 a solar power generation device, a wind power generation device, etc. are applicable, for example.
  • the output terminals of the plurality of cell converters 30 are connected in series and connected to the load device 22. Therefore, according to the voltage to be applied to the load device 22, the number N of connections and the output voltage per unit may be set as appropriate.
  • the sum of these output powers P 1 , P 2 ,..., P N is equal to the power consumption P out of the load device 22.
  • the ratio of the output powers P 1 , P 2 ,..., P N of each cell converter 30 is the cell converter 30-1, 30-2. ,..., 30-N output voltage V 1 , V 2 ,..., V N (not shown).
  • the control device 10 includes hardware as a general computer, such as a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a HDD (Hard Disk Drive), and the HDD. , OS (Operating System), application programs, various data, and the like are stored. The OS and application programs are expanded in the RAM and executed by the CPU. In FIG. 1, the inside of the control device 10 shows functions realized by application programs or the like developed in a RAM as blocks.
  • a CPU Central Processing Unit
  • RAM Random Access Memory
  • ROM Read Only Memory
  • HDD Hard Disk Drive
  • OS Operating System
  • FIG. 1 the inside of the control device 10 shows functions realized by application programs or the like developed in a RAM as blocks.
  • the diagnosis target selection unit 12 (diagnosis target selection means) selects one cell converter 30-m (where 1 ⁇ m ⁇ N) among the N cell converters 30 as a diagnosis target (diagnosis target power conversion device). Choose as.
  • the diagnosis unit 16 (diagnosis means) operates various parameters of the cell converter 30-m to be diagnosed to diagnose whether or not an abnormality has occurred in the cell converter 30-m.
  • the output setting unit 14 sets output power for each cell converter 30.
  • the output power set in each cell converter 30 is substantially the same, and this is referred to as “reference output power”.
  • the output setting unit 14 increases or decreases the output power of the cell converters 30 other than 30-m so that the sum of the output powers of the N cell converters 30 becomes “reference output power ⁇ N”.
  • the UI (User Interface) unit 18 (diagnosis display unit) includes an input device for a user to input various commands, a display for displaying various information to the user, and the like.
  • the UI unit 18 starts diagnosis of each cell converter 30 when detecting a predetermined operation by the user, and displays information for specifying the cell converter 30-m to be diagnosed when the diagnosis is being performed. When is finished, the diagnosis result is displayed.
  • FIG. 2 is a block diagram of the cell converter 30-1.
  • the cell converters 30-2 to 30-N are configured in the same manner as the cell converter 30-1.
  • the cell converter 30-1 includes a converter unit 40 that converts an input DC voltage into another DC voltage, a capacitor 60 that stores the DC voltage output from the converter unit 40, and a DC voltage output from the capacitor 60. It has the inverter part 70 which converts into an alternating voltage, and the control part 80 which controls the converter part 40 and the inverter part 70.
  • the converter unit 40 includes four switching elements 42a, 42b, 42c, and 42d (hereinafter sometimes collectively referred to as “switching elements 42”) that are bridge-connected, and four diodes 44 that are connected in parallel thereto. And have.
  • the four temperature sensors 46 are attached to each switching element 42 and measure the temperature of each switching element 42.
  • the switching element 42 is a MOSFET (Metal-Oxide-SemiconductorSField-Effect Transistor).
  • the controller 80 alternately repeats a period in which the switching elements 42a and 42d are in the on state and 42b and 42c are in the off state and a period in which the switching elements 42b and 42c are in the on state and the 42a and 42d are in the off state.
  • a drive signal is supplied to each switching element 42.
  • the choke coil 48, the primary coil 50a of the transformer 50, and the capacitor 49 are sequentially connected between the connection point of the switching elements 42a and 42b and the connection point of the switching elements 42c and 42d.
  • an LLC resonance circuit is configured in which the primary coil 50a side of the transformer 50 is AC driven by the switching element 42.
  • the AC voltage induced in the secondary coil 50b of the transformer 50 is rectified by the four diodes 52 connected in bridge, and the capacitor 60 is charged by the DC voltage obtained by the rectification.
  • the current sensor 62 measures the output current Ic of the converter unit 40, and the voltage sensor 64 measures the terminal voltage Vc of the capacitor 60.
  • the inverter unit 70 includes four switching elements 72 a, 72 b, 72 c, 72 d (hereinafter sometimes collectively referred to as “switching element 72”) that are bridge-connected, and four diodes 74 that are connected in parallel thereto. And have.
  • the four temperature sensors 76 are attached to each switching element 72 and measure the temperature of each switching element 72.
  • These switching elements 72 are also MOSFETs, for example.
  • the control unit 80 supplies a drive signal to each switching element 72 so that an AC voltage is generated between the connection point of the switching elements 72a and 72b and the connection point of the switching elements 72c and 72d by PWM (Pulse Width Modulation) modulation. Supply.
  • the control unit 80 collects the measurement results of the temperature sensors 46 and 76, the current sensor 62, and the voltage sensor 64, transmits the results to the control device 10 (see FIG. 1), and receives various commands from the control device 10. As a result, a drive signal to be supplied to the switching elements 42 and 72 is generated.
  • FIG. 3 is a flowchart of the capacitor diagnosis main routine.
  • step S2 the variable m is incremented by 1 in the range of 1 to N by the diagnostic object selection unit 12 (see FIG. 1). Then, every time the variable m is incremented, the diagnosis unit 16 executes the process of step S4.
  • the variable m is a variable that designates the cell converter 30-m that is a diagnosis target.
  • step S4 the capacitor diagnosis subroutine shown in FIG. 4 is called. Although details of the processing contents of this subroutine will be described later, the diagnosis unit 16 performs diagnosis of the cell converter 30-m.
  • the output setting unit 14 may change the outputs of the cell converters 30-1, 30-2,..., 30-N.
  • step S8 the diagnosis unit 16 determines whether any abnormality is found in any of the cell converters 30-1, 30-2, ..., 30-N. If “Yes” is determined here, the process proceeds to step S ⁇ b> 10, and the UI unit 18 displays on the display a warning that an abnormality has been found and the specific content of the abnormality. If no abnormality is found in any cell converter 30, step S10 is skipped. Thus, the processing of this routine ends.
  • FIG. 4 is a flowchart of a capacitor diagnosis subroutine.
  • the diagnosis unit 16 sets the charged amount of the capacitor 60 provided in the cell converter 30-m to be diagnosed to Q1 (first charged amount). .
  • the storage amount Q1 is a small value close to zero. More specifically, the diagnosis unit 16 outputs the output power of the converter unit 40 while maintaining the output power of the inverter unit 70 at the reference output power with respect to the control unit 80 (see FIG. 2) of the cell converter 30-m.
  • the control unit 80 sets the duty ratio of the drive signals of the switching elements 42 and 72.
  • the diagnosis unit 16 is supplied with the terminal voltage Vc of the capacitor 60 for each sampling period via the control unit 80 (see FIG. 2), and the diagnosis unit 16 calculates the storage amount Q based on the terminal voltage Vc. presume.
  • step S24 output setting unit 14 increases or decreases the output power of cell converters 30-1, 30-2,..., 30-N. That is, the output setting unit 14 sets the output power P m (and output voltage) of the cell converter 30-m to zero, and the sum of the output powers of the N cell converters 30 becomes “reference output power ⁇ N”. Thus, the output power (and output voltage) of the cell converter 30 other than 30-m is increased.
  • step S24 ends, the process proceeds to step S26.
  • the diagnosis unit 16 outputs a command to the control unit 80 of the cell converter 30-m so as to increase the storage amount of the capacitor 60 of the cell converter 30-m to Q2 (second storage amount).
  • the control unit 80 of the cell converter 30-m controls the duty ratio of the switching elements 42 and 72 according to the command.
  • the output power P m of the inverter unit 70 is set to zero, when a certain amount of power is output from the converter unit 40, the stored amount Q of the capacitor 60 substantially increases due to the power. Go.
  • the diagnosis unit 16 accumulates the data of the output current Ic of the converter unit 40 and the terminal voltage Vc of the capacitor 60 every predetermined sampling period until the charged amount reaches Q2.
  • the charged amount Q2 is a value at which the terminal voltage Vc is close to the rated voltage of the capacitor 60, and is a value larger than Q1 and close to the maximum value of the charged amount of the capacitor 60.
  • the process proceeds to step S28, and the current internal resistance R and capacitance C of the capacitor 60 are calculated. These can be calculated based on the accumulated output current Ic and terminal voltage Vc data.
  • the diagnosis unit 16 determines whether or not the capacitor 60 is normal based on the calculated internal resistance R and capacitance C. That is, the diagnosis unit 16 stores in advance a standard internal resistance R and a capacitance C when the capacitor 60 is new, and the deviation between the standard value and the current value is either R or C. If it is within the predetermined range, the capacitor 60 is determined to be normal. On the other hand, when the deviation exceeds the predetermined range for at least one of R and C, it is determined to be abnormal (deteriorated).
  • step S30 If it is determined as “No” (deteriorated) in step S30, the process proceeds to step S34, and warning preparation is performed. That is, the warning for the user itself is executed in step S10 of the capacitor diagnosis main routine (FIG. 3). As one of the warning messages (character strings) at that time, the cell converter 30-m which is the current diagnosis target is used. A message indicating that the capacitor 60 is deteriorated is prepared. If it is determined as “Yes” (normal) in step S30, step S34 is skipped.
  • step S36 when the process proceeds to step S36, the output power of all the cell converters 30-1, 30-2,..., 30-N is returned to the original reference output power.
  • the amount of electricity stored in the capacitor 60 is Q2, which is close to the maximum value. Therefore, the process waits for a while in Step S36 until the amount of electricity stored Q is stabilized at a normal value. Thus, the processing of this subroutine is completed, and the processing returns to the capacitor diagnosis main routine (FIG. 3).
  • FIG. 5 is a waveform diagram of each part when the capacitor 60 is diagnosed.
  • the quantity N of the cell converter 30 is “3”, and the cell converter 30-m to be diagnosed is “30-3”.
  • the output powers P 1 , P 2 , P 3 are equal. That is, the output powers P 1 , P 2 and P 3 are equal to the reference output power described above.
  • the charged amount Q of the capacitor 60 is substantially constant at the charged amount Q0. However, after time t2, the charged amount Q gradually decreases. This is because the process of step S22 in FIG. 4 is started and the input power to the capacitor 60 is reduced.
  • the storage amount Q has decreased to Q1.
  • the output power P 3 (and output voltage) of the cell converter 30-3 to be diagnosed is set to zero, and other cell converters are maintained so that the power consumption P OUT maintains the previous value.
  • the output powers P 1 and P 2 (and output voltage) of 30-1 and 30-2 are increased stepwise. This is because the process of step S24 of FIG. 4 has been executed.
  • the charged amount Q starts to rise again. This is because the process of step S26 of FIG. 4 has been executed.
  • step S36 the process waits for a while until the charged amount Q is stabilized at a normal value.
  • the diagnosis of the cell converter 30-3 ends at time t8 when some time has elapsed from time t6.
  • the period during which the stored amount is decreased to Q1 time t2 to t4, first time
  • the period during which the stored amount is increased to Q2 time t4 to t6, second time
  • the period of (second time) is longer. This is because, when a solar power generation device, a wind power generation device, or the like is applied as the power supply device 20, an increase in output current is suppressed and the burden on the power supply device 20 is reduced.
  • the thermal resistance of the switching elements 42 and 72 increases, and this causes a large temperature increase. May be. As the temperature rises, the deterioration proceeds at an accelerated rate due to an increase in thermal stress, and eventually the switching elements 42 and 72 are destroyed. Therefore, it is desirable to take measures such as repair and replacement when a certain temperature rise is observed.
  • the user When diagnosing the deterioration state of the switching elements 42 and 72 included in the cell converters 30-1, 30-2,..., 30-N, the user performs a predetermined operation in the UI unit 18 (see FIG. 1). Thereby, an element diagnosis main routine (not shown) is executed.
  • the processing contents of the element diagnosis main routine are the same as those of the capacitor diagnosis main routine (FIG. 3). However, in the step corresponding to step S4 of FIG. 3, the element diagnosis subroutine shown in the flowchart of FIG. 6 is called. Different.
  • FIG. 6 is a flowchart of the element diagnosis subroutine.
  • the output setting unit 14 increases or decreases the output power of the cell converters 30-1, 30-2,. That is, for the cell converter 30-m to be diagnosed, the output setting unit 14 increases the output power up to a predetermined rated output power P MAX and the sum of the output powers of the N cell converters 30 is “reference output power”. The output power of the cell converter 30 other than 30-m is reduced so as to be “ ⁇ N”.
  • the diagnosis unit 16 measures the temperature change of the switching elements 42 and 72 in the cell converter 30-m for a predetermined measurement time. That is, the measurement results of the temperature sensors 46 and 76 are collected by the control unit 80 of the cell converter 30-m every predetermined sampling period, and the measurement results are supplied to the diagnosis unit 16 and stored in the diagnosis unit 16.
  • step S54 the diagnosis unit 16 calculates the temperature rise of each switching element 42, 72. That is, the difference between the measurement results of the temperature sensors 46 and 76 at the start and end of step S52 is calculated.
  • step S54 the diagnosis unit 16 determines whether or not the temperature rise is within a predetermined range for all the switching elements 42 and 72.
  • step S58 warning preparation is performed. That is, a message (character string) is prepared that identifies an element whose temperature rise exceeds a predetermined range among the switching elements 42 and 72 in the cell converter 30-m. If it is determined as “Yes” (normal) in step S54, step S58 is skipped.
  • step S60 the output power of all the cell converters 30-1, 30-2,..., 30-N is returned to the original reference output power. Thus, the processing of this subroutine is completed, and the processing returns to the element diagnosis main routine (not shown).
  • FIG. 7 is a waveform diagram of the output power P S and the power consumption P out per switching element 42, 72 in the cell converter 30-m. Also in FIG. 7, the quantity N of the cell converter 30 is “3”, and the cell converter 30-m to be diagnosed is “30-3”.
  • the output powers P 1 , P 2 , P 3 are equal. That is, the output powers P 1 , P 2 and P 3 are equal to the reference output power.
  • the output power P S per switching element 42, 72 in the cell converter 30-3 is raised to the rated output power P S_MAX , and the output power P 3 of the cell converter 30-3 is also It has been raised to its rated value. Therefore, the output voltage of the cell converter 30-3 also rises in proportion to the output power P 3. Furthermore, the output powers P 1 and P 2 (and output voltage) of the other cell converters 30-1 and 30-2 are lowered so that the power consumption P OUT maintains the previous value.
  • step S50 of FIG. 6 is executed at time t20.
  • the period from time t20 to t22 is a period during which step S52 of FIG. 6 is being executed, and the output power P S is maintained at the rated output power P S_MAX in order to calculate the temperature rise. .
  • the output power P S of the switching element 42, 72, the time t20 is returned to its previous value, the output power P 1, P 2, P 3 of each cell converter 30 is also returned to the reference output power Has been. This is because the process of step S60 in FIG. 6 has been executed.
  • the power conversion control device (10) of the present embodiment is Diagnosis of selecting one power conversion device (30) as a diagnosis target power conversion device (30-m) among a plurality of power conversion devices (30-1, 30-2,..., 30-N) connected in series
  • An object selection unit (12) A diagnosis unit (16) for performing diagnosis on the diagnosis target power converter (30-m);
  • the output voltage (P m / I) of the diagnostic target power converter (30-m) is changed, and the output voltage (P m / I) of the diagnostic target power converter (30-m) is changed.
  • an output setting unit (14) that changes the output voltage of the power conversion device (30) other than the diagnosis target power conversion device (30-m); It is characterized by having.
  • the output voltage (P m / I) of the diagnosis target power converter (30-m) is increased or decreased with the diagnosis
  • the output voltage of the other power converter (30) is supplemented to compensate for the increase or decrease. Can be reduced or increased, so that the power converter (30) can be easily inspected or diagnosed without interrupting the power supply.
  • the plurality of power conversion devices (30) are connected in parallel to the power source (20), Each of the plurality of power conversion devices (30) includes a capacitor (60).
  • the diagnosis unit (16) has a function of diagnosing the presence or absence of abnormality of the capacitor (60) based on the terminal voltage (Vc) of the capacitor (60). Thereby, the presence or absence of abnormality of the capacitor (60) can be diagnosed.
  • the diagnostic unit (16) The capacitor (60) takes a first time (t2 to t4) until the charged amount (Q) of the capacitor (60) of the diagnosis target power converter (30-m) reaches the first charged amount (Q1). With the function of discharging A second time longer than the first time (t2 to t4) until the charged amount (Q) of the capacitor (60) becomes a second charged amount (Q2) larger than the first charged amount (Q1). (T4 to t6) to charge the capacitor (60), It is characterized by having. Thereby, it is possible to execute the diagnosis while reducing the burden even for the power source (20) having a small outputable current.
  • each of the plurality of power conversion devices (30) A plurality of switching elements (42, 72) for performing power conversion; A plurality of temperature sensors (46, 76) mounted on each of the switching elements (42, 72) and measuring the temperature of the corresponding switching elements (42, 72); Having The diagnosis unit (16) has a function of diagnosing whether or not the switching element (42, 72) is abnormal based on temperatures measured by the plurality of temperature sensors (46, 76). Thereby, the presence or absence of abnormality of a switching element (42, 72) can be diagnosed.
  • the power conversion control device (10) further includes a diagnosis display unit (18) for displaying a diagnosis result by the diagnosis unit (16). Thereby, the user can recognize the diagnosis result of the power converter (30).
  • Each of the plurality of power conversion devices (30) includes a control unit (80) that transmits information used for diagnosis to the diagnosis unit (16).
  • the diagnosis unit (16) is characterized by diagnosing the diagnosis target power converter (30-m) based on the received information. Thereby, the processing load necessary for the diagnosis can be shared by the control unit (80).
  • the present invention is not limited to the above-described embodiments, and various modifications can be made.
  • the above-described embodiments are illustrated for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Further, it is possible to delete a part of the configuration of each embodiment, or to add or replace another configuration. Examples of possible modifications to the above embodiment are as follows.
  • the cell converter 30 converts input DC power into AC power, but the type of input / output power (DC or AC) is appropriately selected according to the application. May be.
  • the temperature sensors 46 and 76 are attached to the switching elements 42 and 72, respectively.
  • the temperature sensor may be attached to only one of the switching element 42 and the switching element 72.
  • the switching element 42 constituting the LLC resonant circuit is more likely to have a higher switching speed than the switching element 72, failure tends to occur. Therefore, when the temperature sensor is attached to only one of the switching elements 42, it is desirable to attach the temperature sensor.
  • control unit 80 may be omitted, and the function of the control unit 80 may be realized by the control device 10.
  • the same function as the control apparatus 10 may be added to the control part 80 of each cell converter 30, and the control apparatus 10 may be abbreviate
  • one of the plurality of cell converters 30 is set as a “master”, the control unit 80 of the cell converter 30 performs the same function as the control device 10 described above, and the other cell converters 30 are set as “slave”.
  • the function of the control device 10 may be suspended.
  • MOSFETs are applied as the switching elements 42 and 72. Instead, various switching elements such as IGBTs (Insulated Gate Bipolar Transistors) and bipolar transistors are applied. May be.
  • IGBTs Insulated Gate Bipolar Transistors
  • bipolar transistors are applied. May be.
  • the diagnosis unit 16 diagnoses the deterioration state of the capacitor 60 and the switching elements 42 and 72 of each cell converter 30, but these are examples of diagnosis items, and the cell converter 30- Other diagnoses may be made with increasing or decreasing m output power or output voltage.
  • the output power P 3 when the capacitor 60 is diagnosed, the output power P 3 is set to zero, and the sum of the output powers P 1 and P 2 is made equal to the power consumption P out .
  • the output power P 3 may be a diagnostic output power P C greater than zero, and the sum of the output powers P 1 and P 2 may be smaller than the power consumption P out.
  • the output power P C when the output power P C is added to the output of the converter 40, there is no effect on the slope of the charged amount Q between time t4 and time t6. If not adding the output power P C to the output of the converter 40, the inclination of the storage amount Q is less steep than that shown.
  • FIGS. 4 and 6 Although the processing shown in FIGS. 4 and 6 has been described as software processing using a program in the above embodiment, a part or all of the processing is ASIC (Application Specific Integrated Circuit; IC), or hardware processing using FPGA (field-programmable gate array) or the like.
  • ASIC Application Specific Integrated Circuit
  • FPGA field-programmable gate array

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  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Selon l'invention, pour permettre de vérifier ou de diagnostiquer facilement des dispositifs de conversion d'énergie connectés en série, un dispositif de commande de conversion d'énergie comprend : une unité de sélection de cible de diagnostic (12) qui sélectionne, en tant que dispositif de conversion d'énergie (30-m) à diagnostiquer, un dispositif de conversion d'énergie (30) parmi une pluralité de dispositifs de conversion d'énergie (30-1, 30-2, …, 30-N) connectés en série ; une unité de diagnostic (16) qui diagnostique le dispositif de conversion d'énergie (30-m) à diagnostiquer ; et une unité de configuration de sortie (14) qui fait varier la tension de sortie (Pm/I) du dispositif de conversion d'énergie (30-m) à diagnostiquer en association avec le diagnostic et fait varier la tension de sortie d'un autre dispositif de conversion d'énergie (30) autre que le dispositif de conversion d'énergie (30-m) à diagnostiquer de façon à compenser la variation de la tension de sortie (Pm/I) du dispositif de conversion d'énergie (30-m) à diagnostiquer.
PCT/JP2016/087841 2016-03-09 2016-12-19 Dispositif de commande de conversion d'énergie, système de conversion d'énergie, et programme WO2017154308A1 (fr)

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JP2012065431A (ja) * 2010-09-15 2012-03-29 Aisin Aw Co Ltd インバータ装置
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Publication number Priority date Publication date Assignee Title
JPH05219663A (ja) * 1992-01-31 1993-08-27 Kyocera Corp 太陽光発電システム
JP2008219958A (ja) * 2007-02-28 2008-09-18 Kyoto Denkiki Kk 瞬時電圧低下保護装置
JP2012065431A (ja) * 2010-09-15 2012-03-29 Aisin Aw Co Ltd インバータ装置
JP2016010290A (ja) * 2014-06-26 2016-01-18 東芝三菱電機産業システム株式会社 電力変換装置、変換器及び電力変換装置の制御方法

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