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This paper presents selected case studies of small-signal stability analysis for power systems consisting of interconnected AC and DC sub-systems. The analysis is based on the Cigré DC-grid test system, which is designed to resemble a generalized future configuration of multi-terminal HVDC (MTDC) systems. The small-signal stability of the system is investigated to identify critical modes associated...
High voltage, underwater AC cables are often used to transmit the power generated by an offshore wind farm to the main grid onshore. High charging currents in such cables require reactive compensation at cable ends in order to extend the transmission distance. This paper analyses the investment cost related to the design of the offshore reactive compensation strategy, trying to give guidelines about...
The earlier developed control method using a piecewise linear droop curve, with different droop values for the different segments, has now been optimised for dynamic performance. Non-linearities at the junctions of two linear droop sections have been adressed. Also non-linearity of power based DC voltage control has been adressed. Dynamic instability due to high control gains has been treated and...
The exploitation of wind power is often limited due to the weak interconnection to the main grid. Little consideration given to the different boundary conditions, can either limit the exploitation of potential sites, or increase considerably the costs of integration. This paper explains the relations between grid strength and requirements for wind power generators on reactive power contribution and...
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