The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The rapid expansion in power transmission for the integration of large-scale renewables complemented by infrastructure reinforcements in the form of series compensation poses the threat of subsynchronous resonance (SSR). However, existing and future high-voltage direct current (HVDC) links can be effectively used to mitigate this undesirable phenomenon. In this line, this paper presents an auxiliary...
This paper proposes the extension of the current control loops used in Modular Multilevel Converters to include semiconductors junction temperature as an operational constraint. A new controller is added to the inner current loop to modulate the current limits as a function of the temperature, providing an extension of the power transmission capacity without violating the thermal limits of the semiconductors...
A formal analysis of torsional interactions -a form of subsynchronous resonance (SSR)- in series-compensated systems featuring voltage source converter (VSC) based high-voltage direct-current (HVDC) links are investigated in this paper. Two ac/dc systems are studied. The first one consists of the IEEE First Benchmark Model for SSR studies which has been upgraded with a point-to-point VSC-based HVDC...
This Paper presents the modeling and control of two-terminal Voltage Source Converter Based High Voltage Direct Current (VSC-HVDC) transmission system which are achieved using the software of PSCAD/EMTDC. There are two control designs for VSC-HVDC system in this project: 1. Phase and magnitude control design, 2. Control design under d-q frame. The VSC-HVDC system is operated successfully by using...
Much research has been done regarding the control and coordination of VSC converters in a Multiterminal HVDC network or grid. Amongst those, one underlying concept is the most common- the DC voltage droop control.
The different operation modes of multiterminal HVDC-VSC systems for large offshore wind farms are analyzed. Control schemes for each power converter are proposed. The wind farm VSCs inject the power to the HVDC grid and are controlled as ideal voltage sources that absorb all the incoming power in normal operation, and reduce the injected power whenever a fault occurs and the DC voltage rises. The...
The control and operation of a multiterminal VSC-HVDC grid for offshore wind power under normal and fault conditions are described. The paper addresses maintaining the DC voltage during electrical faults and power reduction methods using fixed speed induction generators.
A wind farm with multiple squirrel cage induction generator (SCIG) controlled by a single voltage source converter (VSC) is presented. This configuration removes the need of individual wind turbine converters. The proposed topology is specially interesting for offshore applications which may require HVDC connection. The set of generators is controlled by adjusting the variable slip to its optimum...
Given the global changes in energy generation and transmission, flexible multi-terminal HVDC networks have the potential to offer energy transfer from diverse and isolated generation sources, particularly offshore wind. In this review paper, the characteristics and control philosophies of multi-terminal networks are discussed and relevant applications are asserted. Future challenges for the widespread...
A multi-terminal voltage source converter based high voltage DC transmission systems (MTDC) was used for grid-connection of large offshore wind power generation. The design of a control system was discussed. A four-terminal system was built to test the control idea. Simulation using PSCAD/EMTDC has been carried out under various load and fault conditions.
Voltage source converter multi-terminal HVDC transmission (MTDC) for the connection of large offshore wind farms to the terrestrial grid is investigated. The voltage-current characteristics of converters for MTDC are presented. A control system for a four-terminal HVDC system is designed and simulated under both normal and abnormal operating conditions.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.