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This paper deals with the low voltage ride through (LVRT) capability of a wind farm comprises different arrangements of the fixed speed and variable speed turbines. Based on the grid code requirements it is seemed that the hybrid topologies can provide better performances than purely either fixed or variable speeds turbines during the fault conditions using DFIG or SCIG. In the hybrid topology two...
Multiterminal voltage source converter (VSC) topologies of high voltage direct current (HVdc) transmission systems (M-HVdc) for the integrating large offshore wind farms are scrutinized. A novel two wind farm with one onshore substation (2WF-1SS) topology is proposed. M-HVdc system standards are defined along with control schemes. HVdc switch gear and HVdc-link topologies are reviewed, considering...
This paper investigates the use and need for DC choppers in VSC HVDC grids. Sudden increases in the DC link voltage, caused by AC grid side voltage drops, can lead to potential damage of the DC equipment. Therefore, DC choppers are currently used in point-to-point links to keep the voltage within safe margins. Given that the HVDC grid topology is expected to change from point-to-point connected offshore...
Due to the increasing penetration of distributed generation resources, more and more microgrids can be found in distribution systems. This paper proposes a phasor measurement unit based distance protection strategy for microgrids in distribution system. At the same time, transfer tripping scheme is adopted to accelerate the tripping speed of the relays on the weak lines. The protection methodology...
Topologies of VSC based MTDC system has been reconnoitered. A Novel two wind farms and one platform (2WF-1PF) topology has been proposed. MTDC link topologies have been analyzed and likened based on techno-economic criteria's: number of HVDC circuit breakers, length and capacity of HVDC circuits, number of offshore and onshore platforms, flexibility, redundancy and utilization of HVDC links. Technical...
The classical approach based on low-voltage converter is commonly employed a low-frequency transformer (inside or outside the nacelle) of wind turbine system. Because of the heave weight and large size of the transformer, the turbine can be expensive and complex for installation and maintenance. As an alternative approach to achieve a compact and light wind turbine a medium-voltage converter using...
The multi-terminal DC wind farm is a promising topology with a voltage source inverter (VSI) connection at the onshore grid. Voltage source converters (VSCs) are robust to AC side fault conditions, however, they are vulnerable to DC faults on the farm side of the converter. This paper analyses DC faults, their transients and resulting protection issues. All kinds of fault overcurrents are analysed...
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