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The aim of this paper is to describe two regulators for a wind turbine equipped with a synchronous generator and a full converter for the interconnection to the grid. The idea is to extract a temporary amount of power from the wind turbine in order to provide short-term frequency support. The wind turbine model presented is specifically designed to analyse effects of wind generation on the electric...
This paper presents a detailed comparison between two voltage source converter high-voltage dc transmission systems. The first is based on the neutral point-clamped converter (also known as HVDC-Light) and the second is based on a modular multilevel converter (known as HVDC-Plus). The comparison focuses on reliability issues of both technologies, such as, fault ride-through capability and control...
A multi-terminal DC (MTDC) transmission system based on an innovative modular multilevel converter (MMC) is presented as a feasible approach to address the concerns regarding reliability and fault ride through capability of multi-terminal dc systems. Furthermore, MTDC using MMC may reduce construction costs and power losses in the converter stations. To demonstrate control flexibility, improved reliability...
A transformless static synchronous compensator based on a modular multilevel converter is presented. Its principle of operation, dc link capacitors voltage balancing technique and control system are described in detail. To demonstrate the suitability of the proposed STATCOM and its effectiveness in medium/high voltage applications where converters with higher number of levels are required, several...
The research work presented in this paper focuses on analyzing the steady-state and transient operation of a wind farm interconnected to the medium voltage network through a voltage source converter with neutral point clamped structure, VSC-NPC. As first part of the analysis, a number of wind speed variations are carried out to observe the steady-state performance of the system. For transient conditions,...
This paper shows the steady state and transient behavior of a Multilevel Voltage Source Converter with Neutral-Point Clamp, VSC-NPC, interconnecting wind generation to medium voltage grids. The benefits on loads close to wind generation are also analyzed. The purpose of VSC operating as inverter is to support the wind generation system performance and dynamic interaction with the network. For analyzing...
In this research work two multi-terminal HVDC topologies connecting large-scale wind farms to the grid are investigated. Such topologies are a two single-input single-output HVDC corridors and a double-input single-output double HVDC corridor. The first topology collects power generated from widely sparse wind farm sites, whilst the second topology is intended to efficiently interconnect nearby wind...
Previous research work has demonstrated that microgeneration improves security of supply and contributes to reduce carbon emissions. However, it has also been recognized that it imposes various challenges in particular with regards to network stability, control and protection. This paper focuses on controlling the power flow from converter-connected microgeneration units to the distribution network...
To provide a DFIG-based wind turbine with good fault ride-through capability, the wind turbine and the power converter should have the ability to protect itself without disconnect during faults in the power grid. Hence, the crowbar for protection of the rotor side converter should be designed properly. The resistor value of the crowbar effects DFIG's rotor current, reactive power output and electrical...
In the future millions of homes in the UK may have the appropriate characteristics to facilitate the deployment of existing micro CHP technologies, and establish "personal power stations", using different types of distributed energy resources (DERs). The micro CHP technologies to be accommodated at houses are typically driven by single-phase generators at 230 V. However, the integration...
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