The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Integration of renewable energy especially wind energy to existing traditional power systems across the world has attained tremendous growth since last two decades. However the unpredictable nature and inter-temporal variation of wind brings many technical challenges for large scale renewable energy integration like power regulation, frequency stability, voltage stability, unit commitment and economic...
As a common tendency, large-scale wind farms are increasingly connected to the transmission system of modern power grids. This introduces some new challenges to the connected power systems, and the transmission system operators (TSOs) have to put some new requirements as part of the grid codes on the integration of wind farms. One common requirement to wind farms is the function of system voltage...
This paper proposes a method of probabilistic analysis to investigate the impact of stochastic uncertainty of grid-connected wind generation on power system small-signal stability. The proposed method is “analytical” in contrast to the numerical method of Monte Carlo simulation which relies on large number of random computations. It can directly calculate the probabilistic density function (PDF) of...
An extended power angle concept based control scheme of doubly fed induction generators (DFIGs) is proposed to operate in place of the conventional PQdq control scheme during the grid fault ride-through (FRT) in this paper. In contrast to the PQdq control, the proposed control has a way better capability to support the terminal voltage of DFIG during the fault period, so that it can help DFIG ride...
Wind turbine installation is increasing rapidly. In some networks, wind power penetration is significantly high and the performance of wind turbine plays an important role in power system operation and control. Especially, the behavior of wind turbines during a power system disturbance would affect power system stability and supply security. Some existing wind turbines are still based on fixed speed...
This paper presents a graphical explanation on the damping torque analysis (DTA) method. The explanation is established based on small-signal equal-area criterion of power system stability analysis. From the graphical explanation, a generalized approach for the analysis of damping effectiveness of power system control is proposed. An example is given in the paper to demonstrate how the generalized...
Large number of wind turbines are being installed and connected to power systems. In some countries or networks, the penetration level of wind power is significant high so as to affect the power system operation and control. Consequently, the stable operation of wind turbine systems is very important for power system stability. This paper studies the effect of STATCOM on stability improvement of a...
This paper firstly reviews the application of energy storage systems in power system stability control. Then an example to study the energy storage systems in power system control to damp power system oscillations is presented. In the conclusions, some further issues in the field are raised.
The concept of power system post-emergency rotor angel control (PERAC) based on the framework of the third- category control and multi-agents system is proposed in this paper. It has been implemented in the control scheme with On-line Pre-decision System (OPS) to retain the power system's angel stability when the system meets the unexpected cascading contingencies during one fixed updating cycle of...
The Danish power system starts to face problems of integrating thousands megawatts of wind power, which produce in a stochastic behavior due to natural wind fluctuations. With wind power capacities increasing, the Danish Transmission System Operator (TSO) is faced with new challenges related to the uncertain nature of wind power. In this paper, proposed models of generations and control system are...
The development of renewable energy based generation technologies attracts more and more attention. In particularly large number of wind turbines are being installed and connected to power system. In some countries or networks, the penetration level of wind power is significant high so as to affect the power system operation and control. Consequently, the stable operation of wind turbine systems is...
This paper explores the possibility of using normal form method for transient stability analysis of grid-connected squirrel cage induction generators (SCIG) considering with rotor electrical transients. The theory of nonlinear dynamic system for power system stability boundary approximation is introduced briefly. The third-order state equations of SCIG equivalent to a synchronous generator with the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.