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This research paper presents an Adaptive Active Relay Protection (AARP) system for the failure state and abnormal operation states, such as short-circuits and overloads, in single phase Off-Grid systems. This proposed AARP system is intended for an Off-Grid system which contains several independent sources of short-circuit power and is able to change and configure itself for various operation states...
In the field of energy, there are themes such as decentralized electricity production, the use of renewable energy sources, such as photovoltaic and wind power plants for self-sufficient energy supply of buildings or objects in the so-called Off-Grid island autonomous systems. Traditional distribution networks are facing new opportunities and challenges, considering the protection scheme and control...
This thesis deals with the effects of solar activity on power transmission lines. In the first part, the basic principle of magnetospheric reaction is described. The second part shows basic simplification and possible way of geomagnetic induced currents calculation. The next part describes current methods of geomagnetic currents mitigation. In the last part, the current situation in the Czech Republic...
A description of the Off-Grid power supply systems and their wiring concept, as well as their protection possibilities, are specified in this article. The previously mentioned Off-Grid power supply systems are primarily designed for customers with a household type: AC main bus connection in By-Pass concept, and a DC main bus connection.
Renewable sources of electric energy belong to key areas in research and development in recent years. This course leads to the design and development of autonomous power units, which are subject to specific requirements, so-called Off-Grid systems, designed as power supply for energy self-sufficient houses. The specific requirements for Off-Grid systems are: independent of external power supply, maximum...
Off-Grid systems are used in remote areas, hamlets, caravans, chalets, which are far from the grid, or if the connection was very difficult and economically costly. Such systems operate independently without external power. As a source of power energy are used photovoltaic and small wind power plants installed capacities to generate electricity for their own use. The produced power energy is accumulated...
Off-Grid systems are used in remote areas, hamlets, caravans, chalets, which are far from the grid, or if the connection was very difficult and economically costly. Such systems operate independently without external power. As a source of power energy are used photovoltaic and small wind power plants installed capacities to generate electricity for their own use. The produced power energy is accumulated...
Connecting of distributed generation of electricity from renewable sources into the grid carries its own risks. These are the so-called negative feedback effect to the operation of electric power system caused by unforeseen stochastic supply of electric power. This paper describes the optimization of devoted power system operation including renewable sources by created so called Solver platform, which...
nowadays, runs an intensive research in development area of energy system with specific requirements, so-called SMART-Grid and Off-Grid. Researchers deal with this phenomenon at several levels across the spectrum, e.g. in scientific research teams, commercial teams and private sector - represented by multinational companies and investments groups. Specific requirements include energy independence...
The energy independence, security and reliability of operating energy distribution systems, along with the use of renewable sources (RES), are the most important topics of energy-related research and development in recent years. The presented paper introduces develop, test and analyze the concept of an autonomous active distribution grid (AADG) with the following set of specific requirements: (i)...
This paper deals with monitoring and remote control system, which has been developed on physical platform of family house operated in Off-grid management. Renewable sources of electric energy belong to key areas in research and development in recent years. This course leads to the design and development of autonomous power units, which are subject to specific requirements, so-called SMART GRID system,...
Stability of distribution system can be influenced by numerous of installed photovoltaic power plants (PVs). Voltage variations are caused in the connection point of PV due to dynamic variability of power flow from these renewable, but intermittent energy sources. This voltage variation can have wide-spread impact to stability of distribution network, where is PV connected. This paper deals with analysis...
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