High-powered wind turbines in the electric power system lead to a significant challenge in balancing production power and electrical power consumption caused by the winds intermittent. In this study, assessing the steady state stability limit (SSSL) in South Sulawesi system when wind turbines is penetrated the Sidrap bus using the REI-Dimo method. The method developed by Paul Dimo was later known as the Radial Equivalent Independent (REI)-Dimo to determine the stability of the system, the condition of the generator which is still stable when a disturbance or load changes occur. REI-Dimo serves to determine the Z equivalent to the generator so that a state of stability can be known. This study is conducted to determine the stability of the steady state generator in South Sulawesi system with 15 generators, 44 buses on the 150kV interconnection system. The simulation results show that the normal condition is 0.0323o, the Critical clearing angle is 111.903o, and the condition of the 100% loading of the critical clearing angle is 90.00o.
Słowa kluczowe: steady state stability limit, wind turbine, penetration, REI-Dimo, CCA.
W artykule założono limit stanu trwałej stabilności SSSL w systemie w prowincji South Sulawesi. Wykorzystano metodę zaproponowana przez Paula Dimo znaną jako Radial Equivalent Independent (REI)-Dimo do określania stabilności systemu kiedy warunki pracy generatora są stabilne przy zaklóconym odbiorze.
Keywords: limit stanu stabilności SSSL, metoda REI-Dimo, trurbiny wiatrowe
In the past decade, the increase in electricity loads has risen sharply, so that the extensive use of fossil fuel power plants produces a lot of gas so that air pollution, global warming, and climate change become problems in various countries. For this reason researchers are developing renewable energy sources (RES) to save and reduce the effects of global warming to reduce fossil fuels by 30% of the total energy generation. From various RES sources, various regions that have the potential of wind turbines have been developed. The South Sulawesi electricity system has installed wind turbines in the Sidrap area of 75MW which are connected to a 150kV transmission line. Wind turbines are the most environmentally friendly type of generator and the most promising resource as a source of energy, economically this plant is very profitable because it does not require production costs, but stability can potentially bring negative impact to the electricity system. The penetration of intermittent power output from wind turbines due to uncertainty in wind speed which has a negative impact on the stability of the electric power system in South Sulawesi [1,2] Installing the wind turbine on a 150kV transmission line on the South Sulawesi system can have an increase in stability when the power supply does not fluctuate, but this can result in a decrease in system stability when the fluctuations in changes in weather conditions and wind speed. The penetration of wind turbine needs to be considered because it can reduce the critical clearing angle (CCA) when the interference, rotor angle stability, distance, frequency, control between the generator occurs and the control mode of the system is briefly interrupted [3-5] In general it has been divided into two categories the WTG have been they are, fixed speed and variable speed. The fixed speed of WTG generally uses a squirrel cage generator (SCIG) to convert mechanical energy from a wind t [...]
 Setiadi, H., et al., Modal interaction of power systems with high penetration of renewable energy and BES systems. International Journal of Electrical Power & Energy Systems, 2018. 97: p. 385-395.  Siswanto, A., et al., Stability improvement of wind turbine penetrated using power system stabilizer (PSS) on South Sulawesi transmission system. AIP Conference Proceedings, 2018. 1941(1): p. 020036.  Shah, R., N. Mithulananthan, and R.C. Bansal, Oscillatory stability analysis with high penetrations of large-scale photovoltaic generation. Energy Conversion and Management, 2013. 65: p. 420-429.  Mehta, B., P. Bhatt, and V. Pandya. Small signal stability analysis of power systems with DDSG based wind power penetration. in 2014 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). 2014.  Yuli Asmi, R., A. Siswanto, and I. Mahmudi, Stability issues in presence variable distributed generation into radial distribution network. Vol. 218. 2018. 01005.  Gautam, D., V. Vittal, and T. Harbour. Impact of increased penetration of DFIG based wind turbine generators on transient and small signal stability of power systems. in IEEE PES General Meeting. 2010.  Piatek, K., A. Firlit, and D. Wojciechowski, Field experience with Statcom in application to wind farms. 2015. 1-5.  Savulescu, S.C., et al., Fast steady-state stability assessment for real-time and operations planning. IEEE Transactions on Power Systems, 1993. 8(4): p. 1557-1569.  Darusman, B.M., S. Ansar, and G. Indar Chaerah, Small Signal Stability Analysis of Wind Turbine Penetration in Sulselrabar Interconnection System. Journal of Physics: Conference Series, 2018. 1090(1): p. 012034.  C.W. Taylor, Power system Voltage Stability. New York, Mc.Graw Hill,, 1994.  Hajiakbari Fini, M. and M.E. Hamedani Golshan, Determining optimal virtual inertia and frequency control parameters to preserve the frequency stability in islanded microgrids with high penetration of renewables. Electric Power Systems Research, 2018. 154: p. 13-22.  Sharma, T. and A. Dahiya. Transient stability improvement in transmission line using SVC with Fuzzy Logic based TID controller. in 2014 IEEE 6th India International Conference on Power Electronics (IICPE). 2014.  Chimirel, C.L., M. Eremia, and S. Enache. Algorithm for steadystate stability assessment under high penetration of probabilistic renewable energy generation conditions. in 2016 18th Mediterranean Electrotechnical Conference (MELECON). 2016.  Gunadin, I., S. Said, and M. Irsan, Determination of stability index of electrical power system using REI-Dimo methods. Vol. 90. 2016. 161-167.  Goh, H.H., et al. Validation of steady-state stability evaluation exerting with Dimo's approximation. in 4th IET Clean Energy and Technology Conference (CEAT 2016). 2016.  Gunadin, I.C., A. Soeprijanto, and O. Penangsang, Real Power Generation Scheduling to Improve Steady State Stability Limit in the Java-Bali 500 kV Interconnection Power System. World Acad. Sci. Eng. Technol, 2010. 72: p. 1-5.  Ansar Suyuti, I.K.a.Y.S.A., The Impact Of The Operation Planning Of Power Plants For Environmental Emissions In South Sulawesi, ARPN Journal of Engineering and Applied Sciences, 2017 VOL. 12,.