The present study proposes a hierarchical wide-area decentralized coordinated control framework for HVDC power system that is robust to multiple operating conditions. The upper level wide-area coordinated controller is designed in the form of dynamic output feedback control that coordinates the lower level HVDC supplementary controller, PSS, and SVC. In order to enhance the robustness of the de...

In this paper performance analysis of various hybrid reactive power compensators (RPC’s) at the inverter AC sides of a line commutated converter (LCC) based multi-terminal HVDC (MTDC) transmission system, feeding weak AC networks, is carried out to thoroughly gather the mechanisms of interactions between an HVDC system and weak AC systems. The hybrid compensator is realized by equally mixing th...

The conductivity mismatch in the composite insulation of high voltage direct current (HVDC) cable accessories causes electric field distribution distortion and even insulation breakdown. Therefore, a liquid silicone rubber (LSR) filled with SiC nanoparticles is prepared for the insulation of cable accessories. The micro-morphology of the SiC/LSR nanocomposites is observed by scanning electron m...

This paper investigates different network topologies of potential future DC offshore grids with respect to their impact on transient fault currents for permanent single pole-toground faults. Investigations are carried out on a twelve-terminal ±320kV VSC-HVDC network modeled around the physical topology of the North Sea. Results are obtained through EMTP simulations in PSCAD using a detailed, fr...

High Voltage Direct Current (HVDC) Transmission systems traditionally employ PI controllers with fixed proportional (P) and integral (I) gains Kp and Ki respectively. Although such controllers are robust and simple, they are not easily optimized to obtain the best performance under all conditions. In the field of intelligent control systems, fuzzy logic control and artificial neural network bas...

This paper analyses and compares different methodologies for supporting system frequency in low inertia power systems using HVDC interconnectors. Reduced system inertia, caused by the massive integration of converter-interfaced renewables and the displacement of conventional synchronous generation, can result in high values of rate of change of frequency (ROCOF), increasing the risk of frequenc...

Abstract— HVDC power transmission is coming up with merits to replace the EHV-AC systems. The controller inverter operation can successfully regulate the power in HVDC link leading to fulfillment of power demand in A.C. networks caused by sudden rise in loading. Since overloading and unloading both lead to the departure of operating frequency below or above normal, its control for normalization...

For the purpose of HVDC or FACTS device studies, the AC power system is often reduced to an equivalent seen by the device at the point of common coupling (PCC). This practice is encouraged by the fact that electromagnetic transient simulation of large AC power systems is computationally expensive and time-consuming and might not respect the realtime constraints (for real-time commissioning stud...

This research work proposes a multi-input multi-output (MIMO) online adaptive feedback linearization NeuroFuzzy control (AFLNFC) scheme to improve the damping of low frequency oscillations (LFOs) in an AC/DC power system. Optimized NeuroFuzzy identification architecture online captures the oscillatory dynamics of the power system through wide area measurement system (WAMS)-based measured speed ...

The modular multilevel converters (MMCs) are widely used in different applications in recent years. Due to lowloss operation, compactness and high modularity, MMC is greatly attractive for high voltage direct current (HVDC) applications. The HVDC station costs and losses are highly related to the switching frequency, capacitor voltage ripple and power quality; which are influenced by modulation...