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.
Multiterminal HVDC networks are a key technology for future power transmission. For safe and reliable operation, it is necessary to equip these with HVDC circuit breakers. In the presented paper, four HVDC breakers, representing different breaker classes, are dimensioned and simulated in synthetic and exemplary grid fault cases. The results are used to illustrate topology dependent limitations and...
The Topology Processing is a crucial part in the energy management system. The topology processor must handle reading of the input data, treating the splitting and merging buses and their connectivity to the different circuits and proceeding to islanding and energizing analysis of the network. It has also to support all the types of substations configurations. In this paper, the difficulties and constraints...
DC systems are a new and emerging technology. DC system benchmark networks are necessary to study transient faults and operation condition changes in these systems (specifically in MVDC systems because they are in a conceptual stage). The paper offers an overview of all DC system architectures and proposes MVDC system benchmark networks based on the knowledge of existing HVDC and LVDC system networks.
Recently proposed meshed HVDC networks include both converters and DC circuit breakers, and the fault currents experienced and therefore the capacity requirement of circuit breakers are dependent on the topology of converters used on the network. This paper analyses the difference in fault currents seen in various network configurations utilising fault-feeding and fault-blocking converters. Results...
With the growing penetration of renewable and demand response programs which lead to frequent flow reversals and substation reconfigurations, correct identification of the topology becomes an imperative task in future power grid management. However, due to low measurement redundancy especially on distribution networks, the aforementioned task is inevitably challenging. In this paper, we are thus motivated...
We consider here the problem of detecting changes in the status of switching devices, circuit breakers in particular, in distribution networks. The lack of measurements in distribution networks compared to transmission networks is the main challenge of this problem. Using expected values of power consumption, and their variance, we are able to quickly calculate the confidence level of identifying...
The current fault diagnosis methods pay more attention to the application of Alarm messages and overlook the topology information, thus it is hard to model for the direction components. This paper expresses the thought that make a fault diagnosis model on the base of topology and it can judge the fault components accurately by the knowledge of topology even with malfunctions of protective relays and...
With the widely installation of Phasor Measurement Units (PMUs) in power system and the increasing requirement of the real-time monitoring and control, a novel power system topology analysis algorithm is proposed with high precise information from PMUs to improve the performance of current network topology analysis. First of all, a method of identifying switch status is established to correct the...
A joint power system state and topology estimator based on a combined Weighted Least Squares (WLS) and Weighted Least Absolute Value (WLAV) strategy is proposed. The resulting coestimation algorithm is devised to simultaneously provide estimates to the analog power system variables and validate the current topology of the electric network. This is accomplished by formulating state & topology coestimation...
Concerning the problems of topologies in current patents, the improvements to the structure of solid-state circuit breakers are made to enhance the reliability and to broaden the field of application and to reduce the manufacturing costs. A novel circuit breaker topology is proposed in this paper, which is improved by using the current-commutation of hybrid circuit breakers for reference. By making...
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.