WO2016147413A1 - コンバータユニットシステム及びコンバータユニット - Google Patents
コンバータユニットシステム及びコンバータユニット Download PDFInfo
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- WO2016147413A1 WO2016147413A1 PCT/JP2015/058370 JP2015058370W WO2016147413A1 WO 2016147413 A1 WO2016147413 A1 WO 2016147413A1 JP 2015058370 W JP2015058370 W JP 2015058370W WO 2016147413 A1 WO2016147413 A1 WO 2016147413A1
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- signal
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/36—Means for starting or stopping converters
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/062—Avoiding or suppressing excessive transient voltages or currents
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
Definitions
- the present invention relates to a converter unit system having an inrush suppression circuit and a converter unit used therefor.
- the semiconductor power converter has a converter unit and an inverter unit.
- a converter unit of a semiconductor power conversion device includes a converter circuit that converts alternating current into direct current by a diode bridge and supplies the direct current to the inverter unit, and a smoothing capacitor that removes a ripple component of the direct current voltage converted by the converter circuit.
- the converter unit is charged with a smoothing capacitor in the converter unit and a smoothing capacitor in the inverter unit connected to the converter unit when the power is turned on, a large inrush current flows through the diode element in the diode bridge of the converter unit.
- the inrush current suppression circuit is disposed between the converter circuit and the inverter unit, and includes an inrush current suppression resistor and a contactor connected in parallel to the inrush current suppression resistor.
- Patent Document 1 includes a rectifier that is connected to an AC power source and converts input AC to DC, an inverter that converts DC to AC of constant voltage and frequency, a DC side of the rectifier, and a DC side of the inverter.
- An uninterruptible power supply is described that includes a smoothing capacitor and a battery connected to a coupled DC intermediate circuit and has an inrush current suppression device.
- the inrush current suppressing device described in Patent Document 1 includes a current-limiting circuit formed by connecting a current-limiting resistor and a resistance short-circuit switch in parallel to the AC input side of the rectifier, and a semiconductor switch element and an element short-circuit switch in parallel.
- a switching circuit consisting of connections is inserted into the DC intermediate circuit, a first smoothing capacitor is connected between the switching circuit and the rectifier, and a second smoothing capacitor and a battery are connected between the switching circuit and the inverter.
- the converter unit including the inrush current suppression circuit turns off the contactor in the inrush current suppression circuit when the power is turned on, so that the current from the power supply charges the smoothing capacitor via the inrush current suppression resistor. .
- the inrush current at the time of charging the smoothing capacitor when the power is turned on can be suppressed by the inrush current suppressing resistor.
- a converter unit will turn ON the contactor of an inrush current suppression circuit by a control part, if the DC voltage detected by the voltage detection part exceeds the set threshold value.
- the converter unit turns off the contactor of the inrush current suppression circuit by the control unit when the DC voltage detected by the voltage detection unit becomes equal to or less than the set threshold value when the power is shut off.
- the converter unit can protect an electrical component such as a diode element of the converter unit from an inrush current when the power is turned on.
- the semiconductor power converter may use a converter unit system in which a plurality of converter units are connected in parallel.
- a large capacity converter unit system is constructed by connecting converter units in parallel, the voltage detection threshold of each voltage detection unit of the converter units connected in parallel varies and the contact point of the contactor in the inrush current suppression circuit
- Inrush current for charging the smoothing capacitor may concentrate and flow, and a large current may flow through the diode elements forming the diode bridge.
- a rush suppression circuit is provided outside the converter unit
- a voltage detector and a controller for turning on or off the contactor in the rush suppression circuit provided outside the converter unit are provided.
- the system needs to be installed outside the unit, which complicates the system.
- the present invention has been made in view of the above, and an object of the present invention is to provide a converter unit system and a converter unit that can average the amount of inrush current flowing through each of converter units connected in parallel.
- the present invention provides a converter unit system in which a plurality of converter units are connected in parallel, wherein the converter unit is connected to an AC power source and a DC bus, A converter circuit that outputs a DC voltage obtained by rectifying an AC voltage input from an AC power source to the DC bus, a first inrush current suppression resistor connected to the DC bus, and a parallel to the first inrush current suppression resistor A first contactor connected to the first inrush current suppression resistor, a smoothing capacitor provided on the DC bus on the side farther from the AC power source than the first contactor, and an external ON signal or OFF A second contactor that outputs a signal, a voltage detector that measures a DC voltage value across the smoothing capacitor, and a DC voltage value detected by the voltage detector.
- a control unit that controls the first contactor and the second contactor, and is connected to a plurality of the converter units, and all the contacts of the second contactors of the plurality of converter units are closed.
- a third contactor that opens when the contact is closed and at least one of the contacts of the second contactor is open; a second inrush current suppression resistor connected in parallel with the third contactor; It is characterized by having.
- the present invention has an effect that it is possible to average the amount of inrush current flowing through each of the converter units connected in parallel to the amount of inrush current flowing through each of the converter units connected in parallel.
- FIG. 1 shows the structure of the power supply circuit which has several converter units concerning Embodiment 1.
- FIG. 1 shows the relationship between the DC voltage detection value at the time of power activation to the converter unit concerning Embodiment 1, and the control signal of a 1st contactor.
- blocking to the converter unit concerning Embodiment 1, and the control signal of a 1st contactor The figure which shows the relationship between the DC voltage detection value at the time of power activation to the converter unit system concerning Embodiment 2, the control signal of a 1st contactor, and the control signal of a 2nd contactor
- the figure which shows the relationship between the DC voltage detection value at the time of power activation to the converter unit system concerning Embodiment 3, the control signal of a 1st contactor, and the control signal of a 2nd contactor The figure which shows the relationship between the DC voltage detection value at the time of the power supply interruption
- FIG. 1 is a diagram showing a configuration of a power supply circuit having a plurality of converter units according to the first embodiment of the present invention.
- the power supply circuit 90 shown in FIG. 1 converts an alternating voltage supplied from an alternating current power source into a direct current, then converts it again into an alternating current and supplies it to the motor.
- the electric motor can use various devices (loads) driven by electric power.
- the power supply circuit 90 includes an AC power source 1, a reactor 2, a converter unit 3 (3 a, 3 b) including two first inrush current suppression resistors 21, a DC bus 4, an inverter unit 5, an electric motor 6, A second inrush current suppressing resistor 8 and a third contactor 9.
- a combination of the plurality of converter units 3, the second inrush current suppressing resistor 8, and the third contactor 9 forms a converter unit system 92.
- an AC voltage is input from the AC power supply 1 to each converter unit 3 through the reactor 2, the circuit breaker 7, and the third contactor 9.
- the second inrush current suppression resistor 8 is connected to the circuit breaker 7 and each converter unit 3 in parallel with the third contactor 9.
- Converter unit 3 converts the input AC voltage into a DC voltage and outputs it to DC bus 4.
- the DC voltage converted by the converter unit 3 flows through the DC bus 4 and is input to the inverter unit 5.
- the inverter unit 5 converts the DC voltage input from the converter unit 3 into an AC voltage having a frequency that matches the operating frequency of the electric motor 6, and outputs the converted AC voltage to the electric motor 6.
- the inverter unit 5 has a smoothing capacitor 80 connected to the DC bus 4.
- the electric motor 6 is supplied with a DC voltage from the inverter unit 5.
- Converter unit 3 includes converter circuit 10, inrush current suppression circuit 20, smoothing capacitor 30, voltage detection unit 40, control unit 50, second contactor 60, and terminal 70.
- an AC voltage is input to the converter unit 3.
- the converter circuit 10 includes diode elements 11, 12, 13, 14, 15 and 16.
- the diode elements 11, 12, 13, 14, 15, and 16 form a diode bridge, and converts the input AC voltage into a DC voltage.
- Converter unit 3 outputs the converted DC voltage to DC bus 4.
- the inrush current suppression circuit 20 is disposed on the DC bus 4 on the inverter unit 5 side than the converter circuit 10.
- the inrush current suppression circuit 20 includes an inrush current suppression resistor 21 and a first contactor 22.
- the inrush current suppression resistor 21 is disposed on the DC bus 4.
- the first contactor 22 is connected in parallel to the inrush suppression current resistor 21.
- the first contactor 22 can be switched between open and closed (ON or OFF).
- the inrush current suppression circuit 20 opens the first contactor 22 when the power to the converter unit 3 is turned on, causes the current to flow through the inrush suppression current resistor 21, and suppresses the inrush current flowing to charge the smoothing capacitor 30. To do.
- the smoothing capacitor 30 is disposed on the DC bus 4 on the inverter unit 5 side than the converter circuit 10 and the inrush current suppression circuit 20.
- the smoothing capacitor 30 smoothes the DC voltage converted by the converter circuit 10.
- the voltage detection unit (DC voltage detection unit) 40 detects a DC voltage value applied to both ends of the smoothing capacitor 30.
- the voltage detection unit 40 outputs the detection result to the control unit 50.
- the controller 50 is connected in series with the first contactor 22 and the second contactor 60.
- the control unit 50 controls the opening / closing (ON or OFF) of the first contactor 22 and the second contactor 60 based on the result detected by the voltage detection unit 40. This point will be described later.
- the second contactor 60 switches between opening and closing the terminal 70 and switching whether to output a contact signal to the outside.
- the terminal 70 is connected to an external device.
- the circuit breaker 7 is disposed in each of the three phases of the AC power source 1 and is disposed between the reactor 2 and the converter unit 3 of each phase.
- the second inrush current suppression resistor 8 and the third contactor 9 are arranged in parallel between the circuit breaker 7 and the converter unit 3.
- the power supply circuit 90 connects the terminal on the coil side of the third contactor 9 connected to one phase of the AC power supply 1 through the circuit breaker 7 and one terminal 70 of the converter unit 3a. Further, the power supply circuit 90 connects the other terminal 70 of the converter unit 3a and the one terminal 70 of the converter unit 3b. Furthermore, the power supply circuit 90 connects the other terminal 70 of the converter unit 3 b and the coil-side terminal of the third contactor 9 connected to the other one phase of the AC power supply 1. In this case, the AC power supply 1 side wiring to which the terminal 70 of the converter unit 3a is connected and the AC power supply 1 side wiring to which the terminal 70 of the converter unit 3b is connected have different phases.
- FIG. 2 is a diagram illustrating a relationship between a DC voltage detected value (measured value) and a control signal of the first contactor when power is supplied to the converter unit according to the first embodiment.
- FIG. 3 is a diagram illustrating a relationship between a DC voltage detection value and a control signal of the first contactor when the power to the converter unit according to the first embodiment is shut off.
- the control unit 50 outputs a signal for ON / OFF control of the first contactor 22 and a signal for ON / OFF control of the second contactor 60 based on the detection result of the voltage detection unit 40.
- controller 50 When power is turned on to converter unit 3, controller 50 turns on the DC voltage value at both ends of smoothing capacitor 30, that is, the DC voltage detection value, and a predetermined first contactor, as shown in FIG. Compared with the voltage threshold 100, after the time ⁇ t1 has elapsed since the detected DC voltage exceeds the voltage threshold 100, the signal for controlling the first contactor 22 is changed from OFF to ON for the first contactor 22. Switch. That is, the control unit 50 switches the control signal output to the first contactor 22 from the OFF control signal to the ON control signal. The first contactor 22 closes the contact when an ON control signal is input.
- the time ⁇ t1 is determined in consideration of the fact that the DC voltage value at both ends of the smoothing capacitor 30 differs for each converter unit due to the error factor of the capacitance of the smoothing capacitor 30.
- the control unit 50 switches the signal for controlling the second contactor 60 from OFF to ON at the same timing as outputting the control signal to the first contactor 22.
- the second contactor 60 closes the contact when an ON control signal is input.
- the converter unit 3 outputs an ON or OFF signal to the outside of the converter unit 3 via the terminal 70 of the converter unit 3.
- the contact of the second contactor 60 is closed, the contact of the third contactor 9 outside the converter unit 3 is closed, and the second inrush current suppression resistor 8 flows between the breaker 7 and the converter unit 3. No path is formed, and the operation for suppressing the inrush current is completed.
- the converter unit 3 when closing the contact of the circuit breaker 7 connected to the AC power supply 1 and turning on the power to the converter unit 3, the converter unit 3 is connected via the second inrush current suppression resistor 8 provided outside the converter unit 3. And the smoothing capacitor 80 of the inverter unit 5 connected in series to the converter unit 3 are charged.
- the control unit 50 shuts off the power supply to the converter unit 3, as shown in FIG. 3, the DC voltage detection value of the smoothing capacitor 30 and a predetermined voltage threshold for turning off the first contactor 22 are set. 110, when the DC voltage detection value of the smoothing capacitor 30 becomes equal to or lower than the voltage threshold value 110, the signal for controlling the first contactor 22 is switched from ON to OFF for the first contactor 22. That is, the control unit 50 switches the control signal output to the first contactor 22 from the ON control signal to the OFF control signal. The first contactor 22 opens a contact when an OFF control signal is input.
- the control unit 50 outputs a control signal to the first contactor 22 and simultaneously switches a signal (control signal) for controlling the second contactor 60 from ON to OFF.
- the second contactor 60 opens a contact when an OFF control signal is input.
- the contact of at least the other second contactor 60 of the converter units 3a and 3b is opened, the contact of the third contactor 9 outside the converter units 3a and 3b is opened. The operation of interrupting the current flowing through the circuit 9 is executed.
- the power supply circuit 90 is a converter unit system having a plurality of converter units 3, a second inrush current suppressing resistor 8, and a third contactor 9, so that even when two converter units 3 are connected in parallel, According to the DC bus voltage value inside the converter unit 3, the contact of the third contactor 9 outside the converter unit 3 can be opened and closed by an output signal from the second contactor 60 provided in the converter unit 3. It becomes possible.
- the controller 50 changes the contact of the first contactor 22 and the second contactor 60 from the open state to the closed state after the time ⁇ t1 has elapsed since the DC voltage detection value exceeds the voltage threshold 100 when the power is turned on. Switch.
- the DC voltage value at both ends of the smoothing capacitor 30, that is, the DC voltage detection value detected by the voltage detection unit 40 is converted into each converter. Unit 3 gives different results. If the DC voltage detection values are different, the first contactor 22 of one converter unit 3 is turned on, but the other first contactor 22 may remain OFF and not change.
- the control unit 50 switches the first contactor 22 from OFF to ON after the time ⁇ t1 has elapsed since the detected DC voltage value of the smoothing capacitor 30 exceeds the voltage threshold value 100. Thereby, it can suppress that the surge current which flows at the time of power activation concentrates on some converter units.
- the power supply circuit 90 closes the third contactor 9 when all the second contactors 60 are turned on, that is, when the contacts are closed. Thereby, after the 2nd contactor 60 of all the converter units 3 is closed, an alternating current can be sent through the path
- the second contactor 60 in the converter unit 3 is turned on without providing a voltage detection circuit outside the converter unit 3.
- the difference in the inrush current amount flowing through each of the converter units 3 connected in parallel be reduced, but the need for an external voltage detection circuit is eliminated, thereby simplifying the large-capacity converter unit system.
- the power supply circuit 90 shown in FIG. 1 will be described by taking an example of a converter unit system in which two converter units 3 are connected in parallel. However, in a converter unit system in which three or more converter units 3 are connected in parallel, two units As in the case where the converter units 3 are connected in parallel, the second contactor 60 and the terminal 70 are provided, and the terminal 70 is further connected to the second inrush current suppression resistor 8 and the third contactor 9, thereby The effect of can be obtained.
- Embodiment 2 the control unit 50 outputs a control signal for turning the first contactor 22 ON or OFF, and simultaneously outputs a control signal for turning the second contactor 60 ON or OFF.
- the control unit 50 outputs a control signal for turning on the second contactor 60 after a predetermined time has elapsed since the control signal for turning on the first contactor 22 is outputted.
- a control signal for turning off the first contactor 22 is output after a predetermined time has elapsed since the control signal for turning off the device 60 is output.
- the power supply circuit 90 operates the converter system as follows when closing the circuit breaker 7 and turning on the power from the AC power supply 1 to the converter system. First, the controller 50 of the converter unit 3a turns off the second contactor 60 of the converter unit 3a, and the controller 50 of the converter unit 3b turns off the second contactor 60 of the converter unit 3a. . As a result, the contacts of the third contactor 9 are still open, that is, in an OFF state.
- the control unit 50 compares the DC voltage value at both ends of the smoothing capacitor 30, that is, the DC voltage detection value, with a predetermined voltage threshold 120 for turning on the first contactor 22.
- the controller 50 turns off a signal for controlling the first contactor 22 of the converter unit 3a to the first contactor 22 of the converter unit 3 after the time ⁇ t1 has elapsed since the detected DC voltage value exceeds the threshold 120. Switch from to ON. By this control signal, the contact of the first contactor 22 of the converter unit 3a is closed.
- the controller 50 of the converter unit 3a switches the signal for controlling the second contactor 60 of the converter unit 3 from OFF to ON after the time ⁇ t2 has elapsed since the control signal was output to the first contactor.
- the contact of the second contactor 60 is closed when an ON control signal is input.
- the control unit 50 of the converter unit 3b similarly to the control unit 50 of the converter unit 3a, the control unit 50 of the converter unit 3b outputs a control signal for closing the contacts of the first contactor 22 and the second contactor 60 of the converter unit 3b.
- the contacts of both the second contactor 60 of the converter unit 3a and the second contactor 60 of the converter unit 3b are closed, the contacts of the third contactor 9 outside the converter units 3a and 3b are closed. By closing the contact of the third contactor 9, the operation for suppressing the inrush current is completed.
- the control unit 50 opens the circuit breaker 7 and shuts off the power, the power to the converter unit 3 is cut off.
- the control unit 50 of the converter unit 3 a determines the DC voltage detection value of the smoothing capacitor 30 of the converter unit 3 and the predetermined voltage for turning off the second contactor 60 of the converter unit 3 a.
- the threshold 130 is compared.
- the controller 50 controls the second contactor 60 of the converter unit 3a with respect to the second contactor 60 of the converter unit 3a when the DC voltage detection value of the smoothing capacitor 30 of the converter unit 3a becomes equal to or less than the voltage threshold value 130. Switch the signal from ON to OFF.
- the contact point is opened when the second contactor 60 of the converter unit 3a receives an OFF control signal.
- the controller 50 of the converter unit 3a turns the signal for controlling the first contactor 22 of the converter unit 3 from ON to OFF after the time ⁇ t3 has elapsed since the control signal was output to the second contactor 60 of the converter unit 3a. Switch to.
- the first contactor 22 of the converter unit 3a opens a contact when an OFF control signal is input.
- the control unit 50 of the converter unit 3b opens the contacts of the first contactor 22 and the second contactor 60 of the converter unit 3b.
- the contact of the third contactor 9 is opened.
- the timing of closing the third contactor 9 outside the converter unit 3 is delayed by a certain time from the timing of closing the first contactor 22 of the converter unit 3, thereby providing the third contactor.
- the smoothing capacitor 30 can be charged.
- the opening timing of the third contactor 9 is delayed by a certain time from the closing timing or opening timing of the first contactor 22 of the converter unit 3, so that the third contactor 9 outside the converter unit 3 collectively converts the converter. Control for suppressing inrush current flowing through the smoothing capacitor 30 of the unit 3 and the smoothing capacitor 80 of the inverter unit 5 can be performed.
- the inrush current is concentrated in one converter unit 3 due to the variation of the operation threshold value of the inrush current suppression circuit 20 inside the converter units 3 connected in parallel, and the inrush current suppression resistor 21 or the diode elements 11, 12, 13. , 14, 15 and 16 can be prevented from flowing a large current.
- Embodiment 3 FIG.
- the contact of the third contactor 9 is first left open. Thereafter, when the third contactor 9 is closed, the smoothing capacitor 30 of the converter unit 3 and the smoothing capacitor 80 of the inverter unit 5 connected in series to the converter unit 3 are charged via the second inrush current suppression resistor 8. .
- the control unit 50 of the converter unit 3 a includes a DC voltage value at both ends of the smoothing capacitor 30, that is, a DC voltage detection value, and a voltage threshold value 140 that turns on the predetermined first contactor. And after the time ⁇ t1 has elapsed since the detected DC voltage exceeds the voltage threshold value 140, a signal for controlling the first contactor 22 of the converter unit 3a is sent to the first contactor 22 of the converter unit 3a. Switch from OFF to ON. The first contactor 22 of the converter unit 3a closes the contact when an ON signal is input.
- control unit 50 of the converter unit 3a has a DC voltage value at both ends of the smoothing capacitor 30, that is, a DC voltage detection value, and a predetermined first voltage set to a predetermined voltage threshold 140 that turns on the first contactor 22.
- the voltage value added with the value ⁇ V1 is compared, and after the time ⁇ t1 has elapsed since the detected DC voltage exceeds the voltage value, the signal for controlling the second contactor 60 of the converter unit 3a is switched from OFF to ON.
- the second contactor 60 of the converter unit 3a closes the contact point when an ON control signal is input. Thereby, the operation
- control unit 50 of the converter unit 3b outputs a control signal for closing the contacts of the first contactor 22 and the second contactor 60 of the converter unit 3b, similarly to the control unit 50 of the converter unit 3a.
- the contacts of the third contactor 9 are closed.
- the control unit 50 of the converter unit 3 a determines the DC voltage detection value of the smoothing capacitor 30 of the converter unit 3 a and the predetermined voltage for turning off the second contactor 60 of the converter unit 3 a.
- the DC voltage detection value of the smoothing capacitor 30 of the converter unit 3a is equal to or lower than the voltage threshold 150 by comparing with the threshold 150
- the second contactor 60 of the converter unit 3 is compared with the second contactor 60 of the converter unit 3a.
- the signal for controlling is switched from ON to OFF.
- the second contactor 60 of the converter unit 3a opens a contact when an OFF control signal is input.
- the control unit 50 of the converter unit 3a determines that the DC voltage detection value of the smoothing capacitor 30 of the converter unit 3a is equal to or less than a voltage value obtained by subtracting a predetermined second voltage value ⁇ V2 from a voltage threshold value for turning off the second contactor 60. Then, the signal for controlling the first contactor 22 of the converter unit 3a is switched from ON to OFF. The contact of the first contactor 22 of the converter unit 3a is opened when an OFF control signal is input. At the same time, the control unit 50 of the converter unit 3b also outputs a control signal for opening the contacts of the first contactor 22 and the second contactor 60 of the converter unit 3b, similarly to the control unit 50 of the converter unit 3a. . When both contacts of the second contactor 60 of the converter units 3a and 3b are opened, the contact of the third contactor 9 is opened.
- the third contactor 9 installed outside the converter unit 3 is closed, and the power is cut off.
- the third contactor outside the converter unit 3 is sometimes controlled by opening the contact of the third contactor 9 installed outside the converter unit 3 before opening the first contactor 22 inside the converter unit. It is possible to perform the power shut-off operation at once, and restart the power supply due to variations in voltage detection at the voltage detector 40 of the converter unit 3 or variations in the operating time of the first contactor 22 inside the converter unit 3.
- rectifier diodes 11, 12, 13, 14, That the 5 or 16 large current flows can be suppressed.
- the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.
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Abstract
Description
図1は、本発明の実施の形態1にかかる複数のコンバータユニットを有する電源回路の構成を示す図である。図1に示す電源回路90は、交流電源から供給される交流電圧を直流に変換した後、再度交流に変換して電動機に供給する。なお、電動機は、電力で駆動される種々の装置(負荷)を用いることができる。電源回路90は、交流電源1とリアクトル2と、2つの第1突入電流抑制抵抗器21を含むコンバータユニット3(3a,3b)と、直流母線4と、インバータユニット5と、電動機6と、遮断器7と、第2突入電流抑制抵抗器8と、第3接触器9と、を有する。電源回路90は、複数のコンバータユニット3と第2突入電流抑制抵抗器8と第3接触器9との組み合わせがコンバータユニットシステム92となる。
実施の形態1においては、制御部50が第1接触器22をONまたはOFFする制御信号を出力するのと同時に、第2接触器60をONまたはOFFする制御信号を出力していた。実施の形態2では、制御部50により、第1接触器22をONする制御信号を出力してから予め定めた時間経過した後に第2接触器60をONする制御信号を出力し、第2接触器60をOFFする制御信号を出力してから予め定めた時間経過した後に第1接触器22をOFFする制御信号を出力する。
実施の形態3では、遮断器7を閉じて交流電源1からコンバータシステムに電源を投入する際には、まず第3接触器9の接点はまだ開いたままの状態にしておく。その後、第3接触器9を閉じると、第2突入電流抑制抵抗器8を介してコンバータユニット3の平滑コンデンサ30、並びにコンバータユニット3に直列に接続されたインバータユニット5の平滑コンデンサ80を充電する。
Claims (5)
- 複数のコンバータユニットが並列に接続されたコンバータユニットシステムであって、
前記コンバータユニットは、交流電源及び直流母線に接続され、
前記交流電源から入力された交流電圧を整流した直流電圧を前記直流母線に出力するコンバータ回路と、
前記直流母線と接続された第1突入電流抑制抵抗器と、
前記第1突入電流抑制抵抗器と並列に接続された第1接触器と、
前記第1突入電流抑制抵抗器及び前記第1接触器よりも前記交流電源から遠い側の前記直流母線に設けられた平滑コンデンサと、
外部にON信号又はOFF信号を出力する第2接触器と、
前記平滑コンデンサの両端の直流電圧値を計測する電圧検出部と、
前記電圧検出部で検出した直流電圧値に基づいて前記第1接触器および前記第2接触器を制御する制御部と、を有し、
複数の前記コンバータユニットと接続され、複数の前記コンバータユニットの前記第2接触器の接点がすべて閉じられた場合、接点が閉じ、前記第2接触器の接点の少なくとも1つが開いている場合、接点が開く第3接触器と、
前記第3接触器と並列に接続される第2突入電流抑制抵抗器と、を有することを特徴とするコンバータユニットシステム。 - 前記制御部は、電源投入時に、前記平滑コンデンサの両端の電圧が予め定めた値以上になった時から予め定めた時間経過後に、前記第1接触器の接点を閉じる信号を出力し、
前記第1接触器の接点を閉じる信号を出力してから予め定めた時間経過後に、前記第2接触器の接点を閉じる信号を出力し、
電源遮断時に、前記平滑コンデンサの両端の電圧が予め定めた値以下になった時に、前記第2接触器の接点を開く信号を出力し、前記第2接触器の接点を開く信号を出力してから予め定めた時間経過後に、前記第1接触器の接点を閉じる信号を出力することを特徴とする請求項1に記載のコンバータユニットシステム。 - 前記制御部は、電源投入時に、前記平滑コンデンサの両端の電圧が予め定めた値以上になった時から予め定めた時間経過後に、前記第1接触器の接点を閉じる信号を出力し、前記平滑コンデンサの両端の電圧が前記予め定めた値に予め定めた第1電圧値を加えた値以上になった時から前記予め定めた時間経過後に、前記第2接触器の接点を閉じる信号を出力し、
電源遮断時に、前記平滑コンデンサの両端の電圧が予め定めた値以下になった時に前記第2接触器の接点を閉じる信号を出力し、また、前記平滑コンデンサの両端の電圧が前記予め定めた値から予め定めた第2電圧値を引いた値以下になった時に、前記第1接触器の接点を閉じる信号を出力することを特徴とする請求項1に記載のコンバータユニットシステム。 - 交流電源から入力された交流電圧を整流して直流電圧を直流母線に出力するコンバータ回路と、
前記直流母線と接続された第1突入電流抑制抵抗器と、
前記第1突入電流抑制抵抗器と並列に接続された第1接触器と、
前記第1突入電流抑制抵抗器及び前記第1接触器よりも前記交流電源から遠い側の前記直流母線に設けられた平滑コンデンサと、
外部にON信号又はOFF信号を出力する第2接触器と、
前記平滑コンデンサの両端の直流電圧値を計測する電圧検出部と、
前記電圧検出部で検出した直流電圧値に基づいて前記第1接触器および前記第2接触器を制御する制御部と、を有することを特徴とするコンバータユニット。 - 前記制御部は、電源投入時であり、かつ、前記平滑コンデンサの両端の電圧が予め定めた値以上になった時から予め定めた時間経過後に、前記第1接触器の接点を閉じる信号を出力し、電源遮断時に、前記平滑コンデンサの両端の電圧が予め定めた値以下になった時に、前記制御部が前記第1接触器の接点を開く信号を出力することを特徴とする請求項4に記載のコンバータユニット。
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