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Dynamical Decentralized Voltage Control of Multi-Terminal HVDC Grids
High-voltage direct current (HVDC) is a commonly used technology for
long-distance electric power transmission, mainly due to its low resistive
losses. When connecting multiple HVDC lines into a multi-terminal HVDC (MTDC)
system, several challenges arise. To ensure safe and efficient operation of
MTDC systems, the voltage of all terminals need to be steered to within an
operational range. In this paper we study the commonly used decentralized
voltage droop controller, and show that it in general does not steer the
voltages to within the operational range. We propose a decentralized PI
controller with deadband, and show that it always steers the voltages to within
the operational range regardless of the loads. Additionally we show that the
proposed controller inherits the property of proportional power sharing from
the droop controller, provided that both the loads and the line resistances are
sufficiently low. The results are validated through simulation in MATLAB
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