Abstract
As they are more efficient in extracting wind energy, variable speed wind power plants (WPPs) are currently replacing the fixed speed WPPs. One possible way to achieve a variable speed WPP is by using a squirrel cage induction generator (SCIG) with full-scale power electronic converter (PEC). In fact, as its cost is relatively lower, the application of SCIG-based variable speed WPP is gaining popularity nowadays. To be able to perform proper analyses (including the load flow analysis) of an electric power system, valid and accurate modeling of the system components is very important. This paper discusses the steady state model of SCIG-based variable speed WPP in power factor control mode for a load flow analysis of an electric power distribution system. The model was developed based on formulas that calculate the turbine mechanical power input and WPP electrical power output. Integration of the proposed model in load flow analysis is also discussed and presented in this paper.
Highlights
The use of wind energy as an alternative to fossil energy to produce electricity has been increasing
The validation study shows that the proposed model is able to represent squirrel cage induction generator (SCIG)-based variable speed wind power plants (WPPs). It can be used for a load flow analysis of an electric power system embedded with SCIG-based variable speed WPP
In unity power factor operations, there is no reactive power absorbed or delivered by or from the WPP (Pg is zero). These results indicate that the proposed model correctly represents SCIG-based variable speed WPP in all of the power factor control modes
Summary
The use of wind energy as an alternative to fossil energy to produce electricity has been increasing. For a certain wind speed value, there will be a generator rotation speed where the WPP power is at maximum. Since the rotational speed of variable speed WPP can be set to conform to the wind speed, this type of WPP can capture the wind energy in a more optimal way. Variable speed WPPs can be realized by using DFIG (Doubly Fed Induction Generator), PMSG (Permanent Magnet Synchronous Generator), or SCIG. SCIG-based variable speed WPP has an advantage as its cost is relatively lower
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