This paper addresses a detailed design of a wind power plant and turbine slope voltage control in the presence of communication delays for a wide short-circuit ratio range operation. The implemented voltage control scheme is based upon the secondary voltage control concept, which offers fast response to grid disturbances, despite the communication delays, i.e., this concept is based on a primary voltage control, located in the wind turbine, which follows an external voltage reference sent by a central controller, called secondary voltage control, which is controlling the voltage at the point of connection with the grid. The performance has been tested using PSCAD/EMTDC program. The plant layout used in the simulations is based on an installed wind power plant, composed of 23 doubly fed generator wind turbines. The resulting performance is evaluated using a compilation of grid code voltage control requirements. The results show that fast response to grid disturbances can be achieved using the secondary voltage control scheme, and the fulfillment of the design requirements can be extended for a wide range of short-circuit ratios.
Larger percentages of wind power penetration\ud
translate to more demanding requirements from grid codes.\ud
Recently, voltage support at the point of connection has been\ud
introduced by several grid codes from around the world, thus,\ud
making it important to analyze this control when applied to wind\ud
power plants.\ud
This paper addresses the analysis of two different voltage\ud
control strategies for a wind power plant, i.e. decentralized and\ud
centralized voltage control schemes.\ud
The analysis has been performed using the equivalent and\ud
simplified transfer functions of the system. Using this\ud
representation, it is possible to investigate the influence of the\ud
plant control gain, short circuit ratio, and time delays on the\ud
system stability, as well as the fulfillment of the design\ud
requirements.Peer ReviewedPostprint (published version
Modern wind power plants are required and\ud
designed to ride through faults in the network, subjected to the\ud
fault clearance and following grid code demands. Beside voltage\ud
support during faults, the wind turbine fault current\ud
contribution is important to establish the correct settings for the\ud
relay of the protections. The following wind turbine generator during faults have been\ud
studied: (i) induction generator, (ii) induction generator with\ud
variable rotor resistance (iii) converter-fed rotor (often referred\ud
to as DFIG) and (iv) full scale converter.\ud
To make a clear comparison and performance analysis during\ud
faults, and the consequent effects on substation protections, the\ud
aforementioned configurations have been simulated using\ud
PSCAD/EMTDC, with the same power plant configuration,\ud
electrical grid and generator data.Peer ReviewedPostprint (published version
This paper addresses the representation of the wound rotor asynchronous generators by an equivalent synchronous generator,\ud
valid for short circuit current calculations.\ud
Modern wind power plants are required and designed to ride through faults in the network, subjected to fault clearing.\ud
Accurate knowledge of the wind turbine short circuit current contribution is needed for component sizing and protection\ud
relay settings during faults within the wind power plant collector system or in the external networks.\ud
When studying fault currents and protection settings for wind power installations, the industry standard is to employ\ud
software packages where generators are represented by their equivalent synchronous generator operational impedances.\ud
Hence, it is of importance to represent non-synchronous wind generators by an equivalent synchronous generator.Peer ReviewedPostprint (published version
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