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US 12,512,675 B2Granted
Power conversion system
AssigneeMitsubishi Electric Corporation
InventorsFuminori Nakamura, Ryota Onishi, Michihiro Tadokoro
Life of this patent
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Abstract
A power conversion system including: a self-excited power converter that converts power between an alternating-current (AC) power system and a direct-current (DC) line; an AC circuit breaker disposed between the AC power system and the self-excited power converter; an arrester connected between the DC line and a ground or between an AC line and the ground, the AC line connecting the AC circuit breaker and the self-excited power converter; and a control device. The control device causes the self-excited power converter to stop a switching operation when the control device detects a ground fault accident on the DC line, and opens the AC circuit breaker after the self-excited power converter stops the switching operation.
Claims8
A power conversion system, comprising:
- a self-excited power converter that converts power between an alternating-current (AC) power system and a direct-current (DC) line;
- an AC circuit breaker disposed between the AC power system and the self-excited power converter;
- an arrester connected directly between the DC line and a ground;
- and
- a control device, wherein
- the arrester and the DC line are provided outside the self-excited power converter, wherein
- the self-excited power converter includes three leg circuits corresponding to three phases of the AC circuit and a DC terminal which are commonly connected to the three leg circuits, wherein
- the DC terminal is connected to the DC line provided outside the self-excited power converter, wherein
- no DC circuit breaker is disposed on a DC line side of the self-excited power converter, and wherein
- the control device:
- causes the self-excited power converter to stop a switching operation when the control device detects a ground fault accident on the DC line;
- and
- opens the AC circuit breaker after the self-excited power converter stops the switching operation.
10 more elements
A power conversion system, comprising:
- a self-excited power converter that converts power between an alternating-current (AC) power system and a direct-current (DC) line;
- an AC circuit breaker disposed between the AC power system and the self-excited power converter;
- an arrester connected directly between the DC line and a ground;
- and
- a control device, wherein
- the arrester and the DC line are provided outside the self-excited power converter, wherein
- the self-excited power converter includes three leg circuits corresponding to three phases of the AC circuit and a DC terminal which are commonly connected to the three leg circuits, wherein
- the DC terminal is connected to the DC line provided outside the self-excited power converter, wherein
- the control device:
- causes the self-excited power converter to stop a switching operation when the control device detects a ground fault accident on the DC line;
- and
- opens the AC circuit breaker after the self-excited power converter stops the switching operation, and wherein
- a first resistor is connected to a positive side of the DC line, and a second resistor is connected to a negative side of the DC line,
- a mid-point of the first resistor and the second resistor is grounded, and
- the first resistor and the second resistor are provided outside the self-excited power converter.
12 more elements
A power conversion system, comprising:
- a self-excited power converter that converts power between an alternating-current (AC) power system and a direct-current (DC) line;
- an AC circuit breaker disposed between the AC power system and the self-excited power converter;
- an arrester connected directly between the DC line and a ground;
- and
- a control device, wherein
- the arrester and the DC line are provided outside the self-excited power converter, wherein
- the self-excited power converter includes three leg circuits corresponding to three phases of the AC circuit and a DC terminal which are commonly connected to the three leg circuits, wherein
- the DC terminal is connected to the DC line provided outside the self-excited power converter, wherein
- the control device:
- causes the self-excited power converter to stop a switching operation when the control device detects a ground fault accident on the DC line;
- and
- opens the AC circuit breaker after the self-excited power converter stops the switching operation, and wherein
- a first capacitor is connected to a positive side of the DC line, and a second capacitor is connected to a negative side of the DC line,
- a mid-point of the first capacitor and the second capacitor is grounded, and
- the first capacitor and the second capacitor are provided outside the self-excited power converter.
12 more elements
A power conversion system, comprising:
- a self-excited power converter that converts power between an alternating-current (AC) power system and a direct-current (DC) line;
- an AC circuit breaker disposed between the AC power system and the self-excited power converter;
- an arrester connected directly between the DC line and a ground;
- and
- a control device, wherein
- the arrester and the DC line are provided outside the self-excited power converter, wherein
- the self-excited power converter includes three leg circuits corresponding to three phases of the AC circuit and a DC terminal which are commonly connected to the three leg circuits, wherein
- the DC terminal is connected to the DC line provided outside the self-excited power converter, wherein
- the control device:
- causes the self-excited power converter to stop a switching operation when the control device detects a ground fault accident on the DC line;
- and
- opens the AC circuit breaker after the self-excited power converter stops the switching operation, wherein
- an AC line is grounded only via a series circuit formed of a reactor and a resistor, the AC line connecting the AC circuit breaker and the self-excited power converter.
10 more elements
Dependencies are inferred from the claim text.