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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...
This paper examines methods of control schemes of multiterminal VSC-HVDC systems for offshore wind farm integration. Modelling strategies of droop DC voltage characteristics for grid side converters are analysed in detail. Differences between voltage-current and voltage-power characteristics are briefly described. A four-terminal VSC-HVDC model with three onshore terminals is established in simulation...
This paper presents a methodology to study the impact of different DC voltage droop settings on the AC system stability. When several Voltage Source Converters (VSC) in a DC system jointly control the DC voltage by means of droop control, an outage of one converter results in an abrupt change of the active power set-points of several other converters. This relative power change is related to the relative...
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