HVDC SYSTEM AND METHOD TO CONTROL A VOLTAGE SOURCE CONVERTER IN A HVDC SYSTEM
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Abstract
A method to control a voltage source converter in a HVDC system includes controlling a frequency and a voltage amplitude of an AC voltage generated by the voltage source converter independently of the conditions in an AC network connected to the voltage source converter. The method is performed by a control unit of an HVDC system. The method may form a basis of a method to black start an AC network. The AC network includes transmission lines and is connected to at least two AC power stations. One of the at least two AC power stations is connected via a HVDC system to the AC network.
32 Citations
19 Claims
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1-9. -9. (canceled)
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10. A method to control an HVDC system connecting two AC networks, wherein a first of the two AC networks is without a power supply and a second of the two AC networks is functioning, wherein the HVDC system comprises two converter stations each having a voltage source converter, the method comprising:
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operating the voltage source converter of a first of the two converter stations which is connected to the AC network without power supply as a voltage source generator by controlling the voltage source converter of the first converter station to create an AC voltage with a desired frequency (f_ord) and a desired voltage amplitude ( UV ord) using a direct AC voltage and frequency control; andcontrolling a second of the two converter stations which is connected to the functioning AC network to keep the DC voltage of the HVDC system in nominal value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An HVDC system connecting two AC networks, wherein a first of the two AC networks is without power supply and a second of the two AC networks is functioning, the HVDC system comprising:
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two converter stations each comprising a voltage source converter and a control unit; wherein the control unit of a first of the two converter stations which is connected to the AC network without power supply operates the corresponding voltage source converter as a voltage source generator by controlling the voltage source converter to create an AC voltage with desired frequency and desired voltage amplitude using a direct AC voltage and frequency control, and wherein the control unit of the second of the two converter stations connected to the functioning AC network controls the corresponding voltage source converter to keep the DC voltage of the HVDC system in nominal value.
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Specification