Power conversion apparatus and method of controlling capacitor voltage of power conversion apparatus
First Claim
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1. A power conversion apparatus comprising:
- a line breaker that is connected in series to a direct-current power supply;
a first capacitor that is connected in parallel to the direct-current power supply through the line breaker;
a discharge circuit that is connected in parallel to the first capacitor, and includes a resistor and a first switching circuit which are connected in series;
a power converter for driving a synchronous machine;
a second capacitor that is connected in parallel to a direct-current side of the power converter;
a second switching circuit that is connected in series between the first capacitor and the second capacitor; and
a control circuit for controlling the discharge circuit,the power conversion apparatus further comprisinga first voltage detector for detecting a voltage of the first capacitor, anda second voltage detector for detecting a voltage of the second capacitor,the control circuit controlling the discharge circuit on the basis of the voltage of the first capacitor and the voltage of the second capacitor,wherein the control circuit, when discharging the second capacitor, controls the line breaker to be turned OFF and controls the first switching circuit to be turned ON to discharge the first capacitor before controlling the second switching circuit to be turned ON to discharge the second capacitor.
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Abstract
A power conversion apparatus includes: a line breaker that is connected in series to a direct-current power supply; a first capacitor that is connected in parallel to the direct-current power supply through the line breaker; a discharge circuit that includes a resistor and a first switching circuit connected in series and is connected in parallel to the first capacitor; a power converter for driving a synchronous machine; a second capacitor that is connected in parallel to a direct-current side of the power converter; a second switching circuit that is connected in series between the first capacitor and the second capacitor; and a control circuit for controlling the discharge circuit. The control circuit controls the discharge circuit on the basis of the voltage of the first capacitor and the voltage of the second capacitor.
10 Citations
8 Claims
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1. A power conversion apparatus comprising:
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a line breaker that is connected in series to a direct-current power supply; a first capacitor that is connected in parallel to the direct-current power supply through the line breaker; a discharge circuit that is connected in parallel to the first capacitor, and includes a resistor and a first switching circuit which are connected in series; a power converter for driving a synchronous machine; a second capacitor that is connected in parallel to a direct-current side of the power converter; a second switching circuit that is connected in series between the first capacitor and the second capacitor; and a control circuit for controlling the discharge circuit, the power conversion apparatus further comprising a first voltage detector for detecting a voltage of the first capacitor, and a second voltage detector for detecting a voltage of the second capacitor, the control circuit controlling the discharge circuit on the basis of the voltage of the first capacitor and the voltage of the second capacitor, wherein the control circuit, when discharging the second capacitor, controls the line breaker to be turned OFF and controls the first switching circuit to be turned ON to discharge the first capacitor before controlling the second switching circuit to be turned ON to discharge the second capacitor. - View Dependent Claims (2)
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3. A power conversion apparatus comprising:
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a line breaker that is connected in series to a direct-current power supply; a first capacitor that is connected in parallel to the direct-current power supply through the line breaker; a discharge circuit that is connected in parallel to the first capacitor, and includes a resistor and a first switching circuit which are connected in series; a power converter for driving a synchronous machine; a second capacitor that is connected in parallel to a direct-current side of the power converter; a second switching circuit that is connected in series between the first capacitor and the second capacitor; and a control circuit for controlling the discharge circuit, the power conversion apparatus further comprising a first voltage detector for detecting a voltage of the first capacitor, and a second voltage detector for detecting a voltage of the second capacitor, the control circuit controlling the discharge circuit on the basis of the voltage of the first capacitor and the voltage of the second capacitor, wherein the control circuit controls the line breaker to be turned OFF when the voltage of the first capacitor becomes higher than or equal to a first voltage threshold and the voltage of the second capacitor becomes higher than or equal to a second voltage threshold, controls the first switching circuit to be turned ON to discharge the first capacitor after the line breaker is opened, and controls the second switching circuit to be turned ON to discharge the second capacitor when the voltage of the second capacitor becomes lower than a third voltage threshold after the first switching circuit is turned ON. - View Dependent Claims (4)
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5. A method of controlling a capacitor voltage of a power conversion apparatus, the power conversion apparatus including a line breaker that is connected in series to a direct-current power supply, a first capacitor that is connected in parallel to the direct-current power supply through the line breaker, a discharge circuit that includes a resistor and a first switching circuit connected in series and is connected in parallel to the first capacitor, a power converter for driving a synchronous machine, a second capacitor that is connected in parallel to a direct-current side of the power converter, a second switching circuit that is connected in series between the first capacitor and the second capacitor, and a control circuit for controlling the first and second switching circuits and the line breaker, the method comprising:
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a step of causing the control circuit to control the line breaker to be turned OFF; a step of causing the control circuit to control the first switching circuit to be turned ON to discharge the first capacitor after the line breaker is opened; and a step of causing the control circuit to control the second switching circuit to be turned ON, subsequent to turning ON the first switching circuit, to discharge the second capacitor when the voltage of the second capacitor falls below a third voltage threshold after the first switching circuit is turned ON, wherein the control circuit controls the discharge circuit, the line breaker, and the second switching circuit on the basis of a voltage of the first capacitor and a voltage of the second capacitor. - View Dependent Claims (6, 7, 8)
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Specification
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Current AssigneeMitsubishi Electric Corporation
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Original AssigneeMitsubishi Electric Corporation
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InventorsKono, Masaki, Hatanaka, Keita
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Primary Examiner(s)Santana, Eduardo Colon
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Assistant Examiner(s)CARRASQUILLO, JORGE L
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Application NumberUS13/259,613Publication NumberTime in Patent Office1,770 DaysField of Search318/130, 318/507, 318/400.3, 318/139, 318/400.14, 318/492, 307/48, 307/401, 307/45, 307/46, 320/127, 320/166, 361/212, 361/11, 323/239, 323/282, 323/286, 323/289, 187/296, 187/290, 187/293US Class Current318/130CPC Class CodesB60L 15/007 Physical arrangements or st...B60L 2200/26 Rail vehiclesB60L 2210/10 DC to DC convertersB60L 2260/24 Coasting modeB60L 3/04 Cutting off the power suppl...B60L 7/14 for vehicles propelled by a...H02M 1/322 Means for rapidly dischargi...Y02T 10/64 Electric machine technologi...Y02T 10/72 Electric energy management ...
