Abstract
Background/Objectives: A case study is presented where a 1.432 MW wind power connection with DFIG (doubly-fed induction generator) technology is analyzed in the stability of the National Transmission System (NTS). Hence, the STN’s database from 2017 is used in DIgSILENT with different demand scenarios and their respective generation dispatch units. Methods/Statistical Analysis: A scan was executed on the flaws in circuits close to the connection of wind energy parks in La Guajira by calculating the percentage of events that generate the disconnection of wind turbines due to voltage sags and swells. The stability in frequency in response to these generation losses is also analyzed. Findings: Regarding the contingencies that were simulated, the outcome was seen in overshoot events of wind turbines due to transitory peaks in voltage during flaws that could not be solved with external reactive compensation. The stability in frequency related to these overshoots is greatly affected on disconnections higher than 400 MW. After verifying the reactive power injection from the converter of the DFIG model in DIgSILENT based on the compliance with electrical parameters supplied by manufacturers, 58% did not meet these technical specifications so a wind turbine model is necessary to grasp the internal operation of the converter. Conclusion: This allows the identification of possible solutions to stability issues that contribute to the operational and regulatory changes to define technical technology-related requirements and the connection of wind turbines in Colombia. Keywords: DFIG Wind Turbine, DIgSILENT, Stability, Voltage Supportability, Wind Energy
Highlights
There are high expectations in Colombia for the connection of 3.000 MW of wind energy, using doubly-fed induction generators (DFIG) in wind turbines according to previous studies[1] and the normativity in countries such as Chile and Panama[2,3] that demand the installation of electric generators with wind turbines.The Planning Unit for Energy and Mines (UPME in Spanish) identified the technical and economic viability of incorporating wind energy generation, finding that the benefits in terms of price, emissions, execution time and complementariness justified the construction of transmission lines for wind energy projects
The voltage supportability limits under operation failures were plotted in DIgSILENT by defining the limits of the report from PHC as a guideline to continue the stability simulations and the other proposed recommendations in their report[6]; they are strict enough and are dimensioned with approximate characteristics in the Colombian electric system, guaranteeing the principles of quality, reliability and security defined in the network codes in force[13]
The results confirm that the use of DFIG wind turbines is the most viable option for the connection of wind power in the country considering that not all the technologies can be used and that it is not an eligible criterion in Colombian operation and regulation
Summary
There are high expectations in Colombia for the connection of 3.000 MW of wind energy, using doubly-fed induction generators (DFIG) in wind turbines according to previous studies[1] and the normativity in countries such as Chile and Panama[2,3] that demand the installation of electric generators with wind turbines.The Planning Unit for Energy and Mines (UPME in Spanish) identified the technical and economic viability of incorporating wind energy generation, finding that the benefits in terms of price, emissions, execution time and complementariness justified the construction of transmission lines for wind energy projects. As a consequence, the Ministry of Mines and Energy (MME) issued Resolution n° 40095 which includes transmission work required in the NTS for the connection of wind energy parks in La Guajira[4]. As a requirement to connect to the National Transmission System (NTS), the Planning Unit demanded connection and information studies on the resource to the promoters of wind energy projects. The wind turbine generator from the Jepirachi Park was replaced by an induction generator model as seen in real scenarios and the SVC model from Chinu was updated including its degraded modes so it always stays between the limits of its capacity
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