In this paper, a global stability and robust nonlinear controller for VSC-HVDC transmission Converters applying input-output linearization (IOL) techniques is proposed. The feedback linearization based nonlinear differential-geometric techniques is used to cancel nonlinearities and decouple the input control variables. Global tracking capability with zero steady-state error of the voltage loop ...

This paper presents the analyzed results of using a high-voltage directcurrent (HVDC) link based on voltage-source converter (VSC) to achieve damping improvement of four parallel-operated doubly-fed induction generator (DFIG)-based offshore wind farms (OWFs) fed to a large power grid. A frequency-domain scheme based on eigenvalue analysis is carried out and a time-domain method based on nonline...

This paper presents the survey of the smart grid technologies, including the background, motivation and practical applications. The driving forces for the smart grid technologies are presented, including the blackout, global energy crisis and environmental protection requirement. The key technology issues for building the smart grid are discussed. The crucial elements of the smart grid and thei...

As the complexity of power networks increases, the installation of devices such as High Voltage Direct Current links (HVDC) and Flexible AC Transmission Systems (FACTS), and the use of advanced control techniques, can be used to improve network stability. Model Predictive Control (MPC) is an example of such an advanced control technique. However, it is often impractical to implement this techni...

HVDC (high voltage direct current) transmission is an effective way to transport electrical power over long distances by using direct current. The insulation system of HVDC components has to be designed for both AC and DC field distributions. It consists of mineral oil and pressboard. The used insulation material behavior has not been completely understood under DC stress. In this paper, electr...

Phase locked loop and synchronization techniques are one of the most important issues for operating grid-interfaced converters in practical applications, which involve Distributed Power Generation Systems, Flexible AC Transmission Systems (FACTS), and High Voltage Direct Current (HVDC) Transmission, and so on. This paper presents a comprehensive review of the recently developed phase locked loo...

Resonances can have negative impact on a Voltage Source Converter-High Voltage DC (VSC-HVDC) system. This paper develops dc impedance models for the rectifier and inverter stations for a VSC-HVDC system when they are viewed from a dc terminal. The impedance models take converter controllers into account. The derived impedance models are validated by comparing frequency responses of the analytic...

This paper proposes a control method of the modular multilevel converter based high voltage direct current (MMC-HVDC) system for the grid voltage stability instead of using a static synchronous compensator (Statcom). The d-axis current component is used to control the grid voltage via the reactive power. Meanwhile, the q-axis current component is employed to control the active power according t...

AC-HVDC-AC energy conversion systems using MMC (modular multilevel converters) are becoming popular to integrate distributed energy systems to the main grid. Such multilevel converters pose a serious problems for HIL (hardware in the loop) simulators required for control, protection design and testing due to the large number of cells that must be simulated individually using very small time ste...

The Modular Multilevel Converter (MMC) topology is becoming an attractive solution for HVDC and FACTS systems. MMC structures are composed from several hundreds to thousands of half-bridge converters. Such large numbers of power switches and electrical nodes introduce important computational difficulties in electromagnetic transient (EMT) type programs. This becomes particularly more complex fo...