IJERT-Transient Stability Analysis of Wind Turbine Based Micro Grid using ETAP Software Sumeet Sehrawat (original) (raw)
Related papers
Transient Stability Analysis of Hybrid Wind Turbine System Integrated To Utility Grid
Future distribution networks will consist of many networks with distributed generations connected or commonly named micro grid. Application of wind turbine as distributed generation in micro grid, can be operated in stand-alone mode, hybrid or integrated with grid. All of those operation mode require stability analysis to ensure the safety of their operations. This stability analysis, transient stability particularly is important to be analyzed, to know the system's ability to maintain synchronization and value of the voltage and frequency after disturbances such as loss of grid connection, short circuit and starting process of generator or motor. Moreover, by performing this case of study, the electricity system operator of distribution network can determine the best solution to do in the event of disturbances which can cause instability in micro grid system. Based on average annual wind speed data in Indonesia, wind turbine is more effective to be operated in hybrid mode and integrated with grid. Besides, reliability and operation cost aspect are its consideration also. For simulation purpose, ETAP 7.0 is used to simulate transient stability study in distribution network of Basuki Rahmat 20 kV, North Surabaya, which is connected to wind turbine and diesel generator. The objective function of this paper is determine best load shedding mechanism to maintain system stability and synchronism under several cases, such as loss of utility grid connection, loss of wind power connection, loss of diesel generator connection, loss of both distributed generations connection and short circuit on one of load bus.
Stability check of doubly fed induction generator (DFIG) micro grid power system
Bulletin of Electrical Engineering and Informatics, 2019
As of late, expanding interest of renewable energy and consumption of non-renewable energy source have prompted developing advancement of renewable energy technology, for example, wind energy. Wind energy has turned out to be one of the reliable sources of renewable energy, which requests extra transmission capacity and better methods for sustaining system reliability. As of now, doubly fed induction generator wind turbine is the most well-known wind turbine. This paper focuses on DFIG wind farm design using MATLAB/SIMULINK and also investigates the issues of the system stability of the DFIG wind turbine micro grid power system. This analysis includes the changes of voltage, current, real power and reactive power based on various conditions of the power system.
Dynamic Modeling and Stability Analysis of Wind Generator Based Micro Grid
Lecture Notes in Mechanical Engineering, 2021
In present studies of wind and photovoltaic generation has a great impact on the microgrid application. This is challenging due to their complex and nonlinear behavior. Integration with the grid is still difficult due to the dynamic characteristics of wind and the intermittent nature of the PV cell. In this paper, a developed model of the microgrid with solar cell and wind turbine source is proposed to study the control aspects and harmonic reduction. The entire model is designed in MATLAB/SIMULINK and simulated in on-grid mode of operation. The generator characteristics like speed, torque, grid voltage, and current are studied under a threephase grid fault with a PID controller. Further to improve the performance, the gains of the PID controller are optimized by application of aim proved gravitational search algorithm KCGSA. The optimized PID controller shows better performance than the conventional PID controller in stability and harmonic reduction.
International Journal of Advanced Trends in Engineering, Science and Technology, 2017
Wind energy is going to be a significant part of electric energy generation in the very near future. However, in addition to its intermittent nature that could lead to major difficulties for power system reliability and stability, the conventional control applied to wind turbines and their generators, usually doubly-fed induction generators (DFIGs), does not allow them to participate in frequency regulation, whether short or long term. Moreover, the use of wind generators for autonomous frequency regulation is becoming an essential objective in power grids with reduced inertia and isolated microgrid operation. While droop-control is suggested by many researchers to solve these problems, detailed analysis of droop-controlled DFIG units in microgrids has not been reported. To fill-out this gap, this paper presents torque-and power-droop implementations in DFIG-based units by some simple modifications in the conventional control and then, by means of small-signal modeling and eigen-value studies, shows how both techniques influence frequency stability. Sensitivity studies, with respect to the presence of turbine-and inverter-based generators in microgrids; and impacts of pitch-angle controller, wind speed variation and isolated mode operation with only wind-generators, are conducted. Timedomain simulation is utilized to verify the analytical results.
Low Carbon Economy (Journal, 2010
Recently, several types of distributed generations (DGs) are connected together and form a small power system called Micro Grid (MG). This paper developed a complete model which can simulate in details the transient dynamic performance of the MG during and subsequent to islanding process. All MG's components are modeled in detail. The developed model is used to investigate how the transient dynamic performance of the MG will affected by increasing the rating of wind generation system installed in the MG. Two cases are studied; the first case investigates the dynamic performance of the MG equipped with 10 kW fixed speed wind generation system. The second studied case indicates how the dynamic performance of the MG will be affected if the wind generation system rating increases to 30 kW. The results showed that increasing of wind generation rating on the MG causes more voltage drops and more frequency fluctuations due to the fluctuation of wind speed. Increasing voltage drops because wind turbine generator is a squirrel cage induction generator and absorbs more reactive power when the generated active power increases. The frequency fluctuations due to power fluctuations of wind turbine as results of wind speed variations. The results proved that when the MG equipped with large wind generation system, high amount of reactive power must be injected in the system to keep its stability. The developed model was built in Matlab ® Simulink ® environment.
Transient stability margin of variable versus fixed speed wind systems in electrical grids
2003 IEEE Bologna Power Tech Conference Proceedings,
For networks with large scale integration of wind farms this paper demonstrates a significant difference between the transient behavior of Variable Speed Wind Systems that adopt doubly fed induction generators with a four quadrant acto-ac converter connected to the rotor windings @FIG) and a fixed speed wind system, where the conventional cage induction generator is used. The reason for this difference is explained, and it is shown that the phenomenon is due to the ability of the two dedicated rotor current regulators of the DFIG to control the electrical torque and reactive power quickly and accurately. This difference is clearly observed after a severe fault (short circuit) occurrence. It will be demonstrated that the adjustable speed generator (DFIG) enhances system stability in power networks.
Transient Analysis for the Stability of Grid Connected Wind Turbine
When the wind power has been integrated to the power system then it poses instability and control issues. So, a thorough study has been needed to identify the potential problems and to develop measures to mitigate them. The presented system is able to maintain the system stability in case of varying voltage generation because of varying speed of wind turbine as well as capable to handle the fault over the system. To provide the stability over the system, the STATCOM based model has been presented in this work. The presented model has been developed in Mat Lab Simulink environment. This paper investigates the use of a Static Synchronous Compensator (STATCOM) along with wind farms for the purpose of stabilizing the grid voltage. The strategy focuses on a fundamental grid operational requirement to maintain proper voltages at the point Of common coupling by regulating voltage. Although integration of high levels of wind power into an existing transmission system does not require a major redesign, it necessitates additional control and compensating equipment to enable recovery from severe system disturbances. The obtained results show that the presented system is effective enough to provide the stability over the system.
Effect of Grid - Connected Wind Turbine Generators on Power System Transient Stability
International Journal on Electrical Engineering and Informatics, 2015
A huge number of wind turbine generators will be integrated into the existing power systems in the near future because it has been identified as one of the most promising field of energy industry. Wind turbines are required to remain connected to the grid during a fault condition so as to support constant power supply. It is therefore necessary to investigate the impact of wind turbine generators on the stability of power systems. This paper presents a comparative study of available wind generator types and examines the effect of penetration level on the power system. Simulations have been performed to compare and demonstrate the transient behavior of a typical 5-machine 22bus system with and without wind power integration. The simulation results reveal that the transient behavior of wind generators has significant effect on the overall stability of power systems and the increase in penetration level may induce the instability into the systems.
International Journal of Energy and Power Engineering, 2014
Wind power generation source differs in several respects from conventional sources of energy like hydro and thermal. Furthermore, wind generators are usually based on different generator technologies other than the conventional synchronous generators. The stochastic nature of wind, makes it very difficult to control the generator power output. Most wind turbines are based on induction generators which consume reactive power just like induction motors during system contingency, which in turn deteriorates the local grid stability. This paper proposes to study and analyze the impact of distributed generation using high speed wind turbines on power systems transient stability. This is achieved using a simplified model of the IEEE 30 bus system which replicates the Kenyan grid system. The base line case simulations were carried out using Dig SILENT Power factory version 14.0 software and results recorded. Thereafter, a Double Fed Induction Generator (DFIG) model was integrated to the sys...
Dynamic modeling and transient stability analysis of distributed generators in a microgrid system
International Journal of Electrical and Computer Engineering (IJECE), 2021
Increasing the penetration level of distributed generation units as well as power electronic devices adds more complexity and variability to the dynamic behaviour of the microgrids. For such systems, studying the transient modelling and stability is essential. One of the major disadvantages of most studies on microgrid modelling is their excessive attention to the steady state period and the lack of attention to microgrid performance during the transient period. In most of the research works, the behaviour of different microgrid loads has not been studied. One of the mechanisms of power systems stability studies is the application of state space modelling. This paper presents a mathematical model for connected inverters in microgrid systems with many variations of operating conditions. Nonlineal tools, phase-plane trajectory analysis, and Lyapunov method were employed to evaluate the limits of small signal models. Based on the results of the present study, applying the model allows for the analysis of the system when subjected to a severe transient disturbance such as loss of large load or generation. Studying the transient stability of microgrid systems in the standalone utility grid is useful and necessary for improving the design of the microgrid's architecture.