Distributed Cooperative Voltage Control of Multiterminal High-Voltage DC Systems

This article proposes a distributed voltage control strategy for multiterminal high-voltage dc (MTdc) systems with fair power sharing among converters. A mathematical model for representing the dynamics of converters in MTdc systems is proposed. A distributed cooperative voltage control scheme is developed in which each converter only needs to communicate with the neighboring converters to regulate the voltage of the pilot bus of MTdc systems. The associated graph to the communication topology of the network is assumed to be a general time-varying graph. The proposed adaptive nonlinear protocol is scale-free and does not need any information about the communication graph and the number of agents and operates properly for time-varying graph. These features enhance the resilience of the proposed method against communication systems failures, multiplicative noise in communication network, and degradations. The performance of the proposed controller is demonstrated though the simulation of CIGRE MTdc test system.