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This paper presents methods to model and solve high-frequency resonance problems in HVDC and wind energy systems. Delay is identified as a root cause for such resonances and is shown to create a negative damping in turbine and HVDC converter output impedances. A systematic method to include control delays in small-signal sequence impedance models is presented and the developed models are used to study the effects of delay on system stability. The method is applied to type-IV and type-III turbines as well as HVDC converters based on modular multilevel converters. In addition to full models that can predict the associated impedance and negative damping behavior accurately, simplified models are also presented to gain insights. Damping of high-frequency resonance by passive and active methods are also discussed. [ABSTRACT FROM AUTHOR]

This paper presents methods to model and solve high-frequency resonance problems in HVDC and wind energy systems. Delay is identified as a root cause for such resonances and is shown to create a negative damping in turbine and HVDC converter output impedances. A systematic method to include control delays in small-signal sequence impedance models is presented and the developed models are used to study the effects of delay on system stability. The method is applied to type-IV and type-III turbines as well as HVDC converters based on modular multilevel converters. In addition to full models that can predict the associated impedance and negative damping behavior accurately, simplified models are also presented to gain insights. Damping of high-frequency resonance by passive and active methods are also discussed. [ABSTRACT FROM AUTHOR]

This paper describes basic technical aspects to consider when applying wind generation to transmission grids that include series-compensated transmission lines, and some thoughts on how the industry can manage this combination in the future. [ABSTRACT FROM PUBLISHER]

This paper describes basic technical aspects to consider when applying wind generation to transmission grids that include series-compensated transmission lines, and some thoughts on how the industry can manage this combination in the future. [ABSTRACT FROM PUBLISHER]