Virtual flux direct power‐backstepping control of 5‐level T‐type multiterminal VSC‐HVDC system
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Date
2017-06
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Publisher
Université de M'sila
Abstract
In this study, a nonlinear control of a 5‐level T‐type converter topology‐based multiterminal
voltage source converter high‐voltage direct current system is proposed. The
idea of the proposed control is to combine the backstepping control and direct power
control with virtual flux concept into one controller able to improve the performance of
the transmission system. In the other side, the use of a 5‐level space vector modulation
with a balancing strategy based on effective use of the redundant switching states of
the converters voltage vectors guarantees the objective of maintaining balanced voltages
in DC‐capacitors. Finally, simulations of the 5‐level T‐type multiterminal voltage
source converter high‐voltage direct current system validate the effectiveness of the
proposed control law. The obtained results are compared with those performed by a
conventional Proportional Integrator (PI) controller. These outcomes allow to exhibit
excellent transient response during a range of operating conditions.
Description
Keywords
backstepping control, five‐level T‐type converter, multilevel space vector modulation, multiterminal high‐voltage direct current, virtual flux direct power control