The paper proposes a security-constrained optimal power flow algorithm (SC-OPF) which allows the post-contingency control of High Voltage Direct Current lines, based on the Voltage Source technology (VSC-HVDC). The presented algorithm integrates corrective actions of HVDC lines in a single optimization problem, without the need to solve a detailed power flow or OPF for each contingency. The app...

It is now clear that the installation of offshore wind parks is the next step towards an even more widespread use of wind power. In what concerns the interconnection of remote offshore wind parks to the existing onshore grid, for distances over 50 km and/or installed capacities above 100 MW, High Voltage Direct Current (HVDC) technology seems to be more adequate than High Voltage Alternating Cu...

<p>Planning of high voltage direct current (HVDC) grids requires inclusion reliability assessment alternatives under study. This paper proposes a methodology to evaluate the adequacy source converter/VSC-HVDC networks. The analyses performance system using N-1 and N-2 contingencies in order detect weaknesses DC network evaluates two types remedial actions keep entire acceptable operating ...

A direct virtual power control algorithm is presented in this paper for VSC-HVDC startup. This control algorithm is based on direct power control (DPC) and expands the range of DPC. When the VSC converter AC side open circuit or the AC side current is zero, the control algorithm maintains the DPC feedback loop by introducing a virtual power, so that the DPC is able to control the AC output volt...

Voltage Source Converters (VSC) have for the first time been used for HVDC transmission in a real network. Experience from the design and commissioning of the transmission shows that the technology has now reached the stage where it is possible to build high voltage converters utilising Insulated Gate Bipolar Transistors (IGBTs). Operation and system tests have proved that the properties that h...

Voltage source converter (VSC)-based high voltage direct current (VSC-HVDC) interconnectors can realize accurate and fast control of power transmission among AC networks, and provide emergency power support for AC networks. VSC-HVDC interconnectors bring exclusive fault characteristics to AC networks, thus influencing the performance of traditional protections. Since fault characteristics are r...

Hybrid HVDC systems have been proposed as an alternative for nominal VSC-Based offshore applications. consist of power station composed the connection high-power diode rectifiers in series with a fractional VSC-HVDC. This hybrid configuration allows large transfer from sites, added robustness, simplicity and efficiency uncontrolled rectifiers. In this research, robust fast-acting controller, Tw...

Large offshore wind farms are recently emerging as promising alternative power Sources. Long distances between offshore generation and onshore distribution grid demand new solutions for their connect alternative to conventional AC transmission above a certain cable length. This paper presents a new VSC transmission topology for HVDC grid connection of offshore wind farms.

This paper analyses the frequency support characteristics of multi-terminal VSC-HVDC (MTDC) schemes using the energy transferred from wind turbine rotating mass and other AC systems. An alternative coordinated control (ACC) scheme, which gives priority to a frequency versus active power droop fitted to onshore VSCs is proposed to: (i) transfer wind turbine recovery power to undisturbed AC grids...