CONVERTER STATION AND A METHOD FOR CONTROL THEREOF
First Claim
1. A converter station for connecting an AC system to an HVDC transmission line, said station comprisingat least one converter having a DC-side thereof connected to a pole of said transmission line on high potential and to low potential and an AC-side connected to said AC system,at least one critical component that a maximum allowed temperature of said at least one critical component may be reached if power transmitted through the converter station be raised above a rated power of the converter station defined as the maximum power allowed to be transmitted through the converter station at continuous operation and at a maximum ambient temperature,a control device adapted to control said at least one converter for determining a level of power transmitted through the converter station,an overload limiting arrangement adapted to, based upon information about an ambient temperature prevailing, determine an overload capability of the converter station defined as how much more power than said rated power may be transmitted through the station for a certain period of time without exceeding said maximum allowed temperature of said at least one critical component and deliver this information to said control device for being used thereby upon a possible request of utilizing this overload capability,an element adapted to determine a value of an actual temperature of said at least one critical component, andan element adapted to determine a value of an actual temperature of any media used to cool said at least one critical component, wherein said overload limiting arrangement is adapted to utilize these temperature values as well as information about actual cooling capacity of any cooling equipment present to cool said at least one critical component and information about a thermal behavior of said at least one critical component and a said possible cooling media upon a possible change of power actually transmitted through the station in a mathematical model for calculating present overload capabilities of the converter station for use in control of the control device upon a possible said request.
5 Assignments
0 Petitions
Accused Products
Abstract
A converter station an element adapted to determine a value of an actual temperature of any critical component of the station and an element adapted to determine a value of an actual temperature of any media used to cool the critical component. An arrangement is adapted to utilize these temperature values and information about actual cooling capacity of any cooling equipment present to cool the critical component and information about the thermal behavior of the critical component and the possible cooling media upon a possible change of the power actually transmitted through the station in a mathematical model for calculating the present overload capabilities of the converter station for use in the control of converters of the station upon a possible request of utilizing an overload capability of the station.
10 Citations
31 Claims
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1. A converter station for connecting an AC system to an HVDC transmission line, said station comprising
at least one converter having a DC-side thereof connected to a pole of said transmission line on high potential and to low potential and an AC-side connected to said AC system, at least one critical component that a maximum allowed temperature of said at least one critical component may be reached if power transmitted through the converter station be raised above a rated power of the converter station defined as the maximum power allowed to be transmitted through the converter station at continuous operation and at a maximum ambient temperature, a control device adapted to control said at least one converter for determining a level of power transmitted through the converter station, an overload limiting arrangement adapted to, based upon information about an ambient temperature prevailing, determine an overload capability of the converter station defined as how much more power than said rated power may be transmitted through the station for a certain period of time without exceeding said maximum allowed temperature of said at least one critical component and deliver this information to said control device for being used thereby upon a possible request of utilizing this overload capability, an element adapted to determine a value of an actual temperature of said at least one critical component, and an element adapted to determine a value of an actual temperature of any media used to cool said at least one critical component, wherein said overload limiting arrangement is adapted to utilize these temperature values as well as information about actual cooling capacity of any cooling equipment present to cool said at least one critical component and information about a thermal behavior of said at least one critical component and a said possible cooling media upon a possible change of power actually transmitted through the station in a mathematical model for calculating present overload capabilities of the converter station for use in control of the control device upon a possible said request.
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20. A method for controlling a converter station for connecting an AC system to an HVDC transmission line, said station comprising at least one converter having a DC side thereof connected to a pole of said transmission line on high potential and to low potential and an AC side connected to said AC system, said station comprising one or more critical component being critical in that a maximum allowed temperature of said at least one critical component may be reached if power transmitted through the converter station be raised above a rated power of the converter station defined as the maximum power allowed to be transmitted through the converter station at continuous operation and at a maximum ambient temperature, the method comprising:
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controlling said converter for determining the level of power transmitted through the converter station, determining, based upon information about the ambient temperature prevailing, the overload capability of the converter station defined as how much more power than said rated power may be transmitted through the station for a certain period of time without exceeding said maximum allowed temperature of said at least one critical component utilizing use the information for said control of said converter upon a possible request of utilizing this overload capability, determining a value of the actual temperature of said at least one critical component, determining a value of the actual temperature of any media used to cool said at least one critical component, and utilizing utilize the temperature values and information about actual cooling capacity of any cooling equipment present to cool said at least one critical component and information about the thermal behavior of said at least one critical component and a said possible cooling media upon a possible change of the power actually transmitted through the station in a mathematical model for calculating the present overload capabilities of the converter station for use in said control upon a possible said request. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. A computer program product, comprising:
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a computer readable medium; and computer program instructions recorded on the computer readable medium and executable by a processor for carrying out a method for controlling a converter station for connecting an AC system to an HVDC transmission line, said station comprising at least one converter having a DC side thereof connected to a pole of said transmission line on high potential and to low potential and an AC side connected to said AC system, said station comprising one or more critical component being critical in that a maximum allowed temperature of said at least one critical component may be reached if power transmitted through the converter station be raised above a rated power of the converter station defined as the maximum power allowed to be transmitted through the converter station at continuous operation and at a maximum ambient temperature, the method comprising; controlling said converter for determining the level of power transmitted through the converter station, determining, based upon information about the ambient temperature prevailing, the overload capability of the converter station defined as how much more power than said rated power may be transmitted through the station for a certain period of time without exceeding said maximum allowed temperature of said at least one critical component, utilizing use the information for said control of said converter upon a possible request of utilizing this overload capability, determining a value of the actual temperature of said at least one critical component, determining a value of the actual temperature of any media used to cool said at least one critical component, and utilizing utilize the temperature values and information about actual cooling capacity of any cooling equipment present to cool said at least one critical component and information about the thermal behavior of said at least one critical component and said possible cooling media upon a possible change of the power actually transmitted through the station in a mathematical model for calculating the present overload capabilities of the converter station for use in said control upon a possible said request. - View Dependent Claims (30, 31)
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Specification