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.
One of the most important aspects of time-domain simulations for power system planning studies is load modeling. For a realistic representation of the load, the Western Electricity Coordinating Council (WECC) model validation and working group developed the composite load model. The composite load model represents the aggregation of different types of loads at the substation level. However, there...
Traditional transmission planning for electric power systems involves analyzing certain system conditions for a number of contingency events based on deterministic criteria. This paper discusses the motivations for ERCOT to explore probabilistic approaches in transmission planning and presents the potential applications of probabilistic planning methods that ERCOT is currently investigating. It also...
This paper presents an approach for developing dynamic load model data records for use in planning studies. The load model structure used is the so-called WECC Composite Load Model (CLM). The approach is based on using information about customer classes, various load components in each customer class, and electrical characteristics of each load component. The process is implemented in a tool that...
Although shield wires are typically grounded through a finite tower footing resistance, positive- and zero-sequence line impedances are calculated assuming no tower footing resistance. Since impedance-based fault location algorithms require sequence line impedances to compute the distance to fault, this paper evaluates the impact of the grounded shield wire assumption on the accuracy of fault locating...
A number of impedance-based fault location algorithms have been developed for estimating the distance to faults in a transmission network. Each algorithm has specific input data requirements and makes certain assumptions that may or may not hold true in a particular fault location scenario. Without a detailed understanding of the principle of each fault-locating method, choosing the most suitable...
Impedance-based fault location algorithms require positive- and zero-sequence line impedance to determine the distance to fault. When solving for these line constants in a multi-grounded transmission system, power system analysis programs use Carson's model, modified Carson's model or Deri model to account for earth current return. The study is motivated by the fact that line constants calculated...
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.