Electric power converter
First Claim
1. A voltage source converter for high power application, comprising:
- a plurality of valves, each valve comprising a plurality of extinguishable semiconducting elements, anda valve control unit configured to control the voltage source converter via an executing pulse-width modulation signal,wherein the valve control unit comprises a first control unit, a first pulse-width modulator for providing a first pulse-width modulation signal according to a fast dynamic control, a second control unit, a second pulse-width modulator for providing a second pulse-width modulation signal according to a slow dynamic control, a mode detector configured to detect a first mode of operation of the voltage source converter and a second mode of operation of the voltage source converter, and a selector connected to the first pulse-width modulator and second pulse-width modulator for selecting in dependence of the mode detector, the second pulse width modulation signal during the first mode of operation and the first pulse width modulation signal during a second mode of operation as the executing pulse-width modulation signal.
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Accused Products
Abstract
A voltage source converter for high power application containing a plurality of valves, each valve containing a plurality of extinguishable semiconducting elements, and a valve control unit containing a computer and a pulse-width modulator providing an executing control signal for controlling the semiconducting elements. The valve control unit includes a first control containing a first pulse-width modulator for providing a first pulse-width modulation signal, a second control containing a second pulse-width modulator for providing, a second pulse-width modulation signal, a mode detector, and a selector connected to the first and second pulse-width modulator for selecting in dependence of the mode detector the executing pulse-width modulation signal.
14 Citations
20 Claims
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1. A voltage source converter for high power application, comprising:
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a plurality of valves, each valve comprising a plurality of extinguishable semiconducting elements, and a valve control unit configured to control the voltage source converter via an executing pulse-width modulation signal, wherein the valve control unit comprises a first control unit, a first pulse-width modulator for providing a first pulse-width modulation signal according to a fast dynamic control, a second control unit, a second pulse-width modulator for providing a second pulse-width modulation signal according to a slow dynamic control, a mode detector configured to detect a first mode of operation of the voltage source converter and a second mode of operation of the voltage source converter, and a selector connected to the first pulse-width modulator and second pulse-width modulator for selecting in dependence of the mode detector, the second pulse width modulation signal during the first mode of operation and the first pulse width modulation signal during a second mode of operation as the executing pulse-width modulation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 19, 20)
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13. A method for controlling a voltage source converter comprising a plurality of valves, each valve comprising a plurality of extinguishable semiconducting elements in a high power application, the method comprising:
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providing an executing pulse width modulation signal for controlling the voltage source converter, detecting a first mode of operation and a second mode of operation of the voltage source converter, controlling the voltage source converter during the first mode of operation and a first period of time wherein the executing signal comprises a second pulse-width modulation signal according to a slow dynamic control, and controlling the voltage source converter during the second mode of operation and a second period of time, following the first period of time, wherein the executing signal comprises a second pulse-width modulation signal according to a fast dynamic control. - View Dependent Claims (14, 15, 16)
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17. A computer program product storable on a computer readable medium containing computer program instructions executable by a processor for performing the steps of
providing an executing first pulse width modulation signal for controlling the voltage source converter, detecting a first and a second mode of operation of the converter, controlling the voltage source converter during the first mode of operation and a first period of time wherein the executing signal comprises a second pulse-width modulation signal according to a slow dynamic control, and controlling the voltage source converter during the first mode of operation and a second period of time, following the first period of time, wherein the executing signal comprises a second pulse-width modulation signal according to a slow dynamic control.
Specification