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It's important for us to carry on reliability research of protection system. There are three methods to analyze and compute reliability index of electric relay protection system: Markov method, Fault Tree Analysis (FTA), Event Tree Analysis (ETA). The paper describes how to use these three methods to carry out quantitative analysis of protection system reliability and discusses feature and difference...
Medium voltage power system applying on the shipboard of the reliability presents the new requirement. Because of the inertia technical reasons, the shipboard grounding of medium voltage generator has been used the land- way-high resistor grounding, it has not been in-depth study. This paper through simulation and numerical analysis to make sure the appropriate grounding method of medium voltage generator...
In order to ensure ambulance man arrived the scene on time, remove the accident , treat the injured after the accident occurred, and achieve to the minimize loss of traffic accidents and the maximum social benefits, basing on principles of reliability, this paper which started with emergency rescue system structure analyzed the structure of emergency rescue system on highway, from three ways: incident...
Solid power system planning is fundamental to the safety, reliability and economy of power system operation. In the deregulated power grid environments, power grid planners not only have to handle massive geographic data, power equipment parameter data and grid operational data, but also have to solve very complex decision-making problems when they are committing power grid planning. Thus, it is necessary...
A method of reliability evaluation for complex medium-voltage distribution system based on feeder partition model and the minimal path method is proposed in this paper. According to the topology of distribution system, a distribution network is divided into different zones, and then the distribution network is changed into an oriented diagram. Applying the minimal path method, this diagram is divided...
To meet the power customer's satisfaction is the essential responsibility of the utilities. Considering the property of customer's satisfaction degree, an analytical interval assessment method of voltage sag frequency is proposed. The customer satisfaction degree is presented by an interval data corresponding to the voltage tolerance of tested equipment installed at the customer side. Based on the...
Optimal switching device placement is of vital importance for distribution networks' planning and operation. The combination of distributed generation (DG) and main networks is considered a principle way that could reduce investment outlay, lower the energy depletion and improve reliability of distribution systems. At present, all the study on DG impact on reliability of distribution systems is negative...
The power loss and voltage distribution of distribution network are closely related to the site and size of DG and the load distribution. A new method of DG optimal placement is proposed based on load centroid. The district DG supplied is thought as an irregular shape load block and the load size is thought as quality. The power loss is the least when the DG is installed at the load centroid. The...
Global weather condition is deteriorating, and the impacts on the transmission and distribution system are more and more serious. Therefore it is especially important to take the reliability impact assessment of the grid considering the weather factors. This article will divide the weather state into normal weather, bad weather and catastrophic weather, and establish the power system reliability evaluation...
Reasonable black start schemes play a major role to the fast restoration of power system after black-out. Partitioning the whole system into several subsystems which are restored in parallel can speed up the restoration process. This paper proposes an optimization approach of network partitioning and the restoration sequence determination for black-start. The optimization target is to restore as many...
With the development of High Voltage Directed Current (HVDC) transmission technology, the increasing numbers of HVDC projects and the appearance of HVAC/HVDC composite systems, the reliability of HVDC system has become a very important factor to the bulk power system. This paper provides the reliability evaluation model of the composite power systems with DC transmission lines, which includes the...
With environmental and financial constraints, multiple circuits transmission lines which have common right-of-way (MCTLCW) or common structure are more widely used in the electrical grid. So it is necessary to investigate the reliability of these structures on the composite power system. In this paper, three different contingency modes are considered, which are line independent fault, dependent fault...
This paper proposed a kind of new supervisory system of computer the distribution supervisory system of computer. The system is arranged through scattering, stratified control, which is developmental, and with powerful mutual operating ness etc. The practical experience of the system for eight years in Huajia (Henan) indicated that the system is reliable, safety, real-time and economy.
A hybrid approach based on the pseudo-sequential sampling and the network-equivalence techniques is proposed for distribution system reliability evaluation in this paper. In pseudo-sequential sampling, a failure state is obtained based on the non sequential simulation at first, then the whole system interruption I(a set of successive failure states) is acquired by the forward/backward simulation associated...
Smart Grid is one of the hot research directions of power system. How to interconnect the wind power generation with power system safely and reliably is a major challenge in the development of Smart Grid. Wind power generation interconnection standards are the technology base, which will push the development of smart grid. This paper compares the wind power generation interconnection standards of...
This paper presents a new method of vulnerability control for power system by smart demand response (SDR) to insure system vulnerability value kept at a steady level. Vulnerability model is based on sensitive technology (ST) and complex network (CN) theory to reflect physical and structural characteristics of power system. In this paper, ST is adopted by line outage distribution factor (LODF) to show...
Intelligent network is an important mean to achieve energy saving and promote renewable energy develop. With the technology of power electronics, IT, communications continuing to evolve, the smart grid will be an important direction of the electric power industry development. With the construction process of it, the reliability is paid more and more attention. The reliability method and key technology...
Even though Saudi Arabia is the world's largest producer and exporter of petroleum and petroleum based products, it is also blessed with high potential of renewable energy sources like solar and wind. Untapped wind and solar energy sources, which are abundant throughout the Kingdom, can be connected and optimally integrated into the grid through the use of smart grid technologies and the expansion...
Traditional transmission planning often takes the minimum investment of network as objective function with power supply reliability as a constraint. However, this approach does not give consideration to both economy and reliability of the network. In this paper, the probabilistic method is performed to research on transmission expansion planning. Probabilistic Reliability Index (PRI) is modified,...
The topological structure of shipboard power system is one of the key factors affecting the compositive performance. An adjacent matrix based minimal cut sets method is adopted in this paper to build a universal algorithm of reliability evaluation of shipboard power systems. Basing on this reliability assessment platform, qualitative analysis and quantitative calculation of different shipboard topological...
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