Apparatus and method for controlling asymmetric modular multilevel converter
First Claim
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1. An apparatus for controlling an asymmetric modular multilevel converter, comprising:
- an asymmetric arm connected between a positive (+) input terminal and a negative (−
) input terminal of a DC bus voltage (VDC) and includingN modules of full bridge converter, andK modules of half bridge converter, wherein said N and K are constant number, respectively; and
a control method controlling each capacitor voltage of the N modules of full bridge converter and each capacitor voltage of the K modules of half bridge converter to be different from one another,wherein each module configuring the asymmetric arm uses a different voltage and an output voltage is expressed by a combination thereof,each of the K modules of half bridge converter is responsible for an equally divided voltage, anda sum of capacitor voltages of the K modules of half bridge converter is always equal to the DC bus voltage (VDC) when the asymmetric modular multilevel converter (AMMC) is in a normal state.
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Abstract
Disclosed is an apparatus and method for controlling an asymmetric modular multilevel converter which allow numerous levels to be expressed according to a combination of modules each using a different voltage, comprising: an asymmetric arm configured with a full bridge and a half bridge; and a control method of controlling each capacitor level of the full bridges and capacitor level of the remaining half bridges to be different from one another by a full bridge structure, wherein each module configuring the asymmetric arm uses a different voltage and an output voltage is expressed by a combination thereof.
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Citations
15 Claims
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1. An apparatus for controlling an asymmetric modular multilevel converter, comprising:
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an asymmetric arm connected between a positive (+) input terminal and a negative (−
) input terminal of a DC bus voltage (VDC) and includingN modules of full bridge converter, and K modules of half bridge converter, wherein said N and K are constant number, respectively; and a control method controlling each capacitor voltage of the N modules of full bridge converter and each capacitor voltage of the K modules of half bridge converter to be different from one another, wherein each module configuring the asymmetric arm uses a different voltage and an output voltage is expressed by a combination thereof, each of the K modules of half bridge converter is responsible for an equally divided voltage, and a sum of capacitor voltages of the K modules of half bridge converter is always equal to the DC bus voltage (VDC) when the asymmetric modular multilevel converter (AMMC) is in a normal state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling an asymmetric modular multilevel converter, the asymmetric modular multilevel converter comprising an asymmetric arm connected between a positive (+) input terminal and a negative (−
- ) input terminal of a DC bus voltage (VDC) and including
N modules of full bridge converter, and K modules of half bridge converter, wherein said N and K are constant number, respectively, the method comprising; each of the K modules of half bridge converter is responsible for an equally divided voltage; a sum of capacitor voltages of the K modules of half bridge converter is always equal to the DC bus voltage (VDC) when the asymmetric modular multilevel converter is in a normal state; and capacitor voltages of the N modules of full bridge converter are configured to be different in sequence by control, wherein an output voltage of the K modules of half bridge converter is within a range of the DC bus voltage, and each of the capacitor voltages of the K modules of half bridge converter is maintained at a level of 1/KVDC. - View Dependent Claims (10, 11, 12, 13, 14, 15)
- ) input terminal of a DC bus voltage (VDC) and including
Specification