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One of the biggest threats for the security of power grids are congestion of cross-border lines and congestion in the network itself as result of parallel flows. Nowadays, occurrence of congestion is a result of limited network transfer capacities as a direct consequence of increased power transactions. One of the reasons for cross-border congestions are the unreal cross-border capacities calculations...
Continuously expanding deployments of distributed power-generation systems (DPGSs) are transforming the conventional centralized power grid into a mixed distributed electrical network. The modern power grid requires flexible energy utilization but presents challenges in the case of a high penetration degree of renewable energy, among which wind and solar photovoltaics are typical sources. The integration...
This paper presents a novel carbon emission flow (CEF) model to assess and analyze the carbon emission of each component in power networks. Through the use of information about CEF, demand side management (DSM) and supply side management (SSM) are combined to reduce the emission. Three levels of load curtailment and three strategies of renewable energy sources (RES) utilization are proposed. The IEEE...
This paper analyzes power generation from sea waves by using power conditioning system and linear permanent magnet generator. A buoy is placed on the ocean surface and connected to the linear generator. The wave energy is carried out from the movement of a buoy. An electrical conversion system is needed between the generator and the grid. For an analysis of the power system, the modeling of the linear...
The increasing exploitation of Renewable Energy Sources (RES) is progressively displacing large conventional power plants, thus reducing system operating reserves and stability margins. Therefore new resources for ancillary service provision are needed. Very fast and flexible response capabilities make Battery Energy Storage Systems (BESS) good candidates to this purpose. However, the related cycling...
We study the profitable amount of additional storages in the German electricity network. The more storages there are the less profitable they become. To account for this effect, we construct a price model based on German data from 2015. This price model is based on the merit order theory and the explanatory variables are conventional generation and export. Then we build a cost model for different...
A Microgrid (MG) has a major role in power system. Because of its numerous benefits, such as its ability to reduce environmental impact and enhance the reliability of a power system. Hence, Multi-MG (MMG) consisted of multiple MGs is being studied intensively. This paper proposes the optimal power exchange of MMG with hierarchical coordination. The whole system architecture consists of two layers:...
The influence of distributed generation (DG) from renewable energy sources on the distribution network (DN) hosting capacity was analyzed in this paper. The analysis was conducted on the simulation model which represents a real DN with the DG consisting of medium size biogas combined heat & power (CHP) and small size household photovoltaic (PV) systems. Main goal of this paper was to analyze how...
Energy harvesters are today gaining ever more interest, enabling the recovery of otherwise wasted energy in a large variety of systems. Among them, piezoelectric devices are particularly suitable to generate electrical energy from vibrations and surplus mechanical energy. A two-stage power conditioning circuit, consisting of a AC-DC converter followed by a DC-DC stage, is usually placed at the output...
The application of semidefinite programming (SDP) to the resolution of the Optimal Power Flow problem (OPF) has recently been the focus of significant research effort. In conjunction with sparsity-exploiting techniques, it can yield globally optimal solutions for well-conditioned large-scale networks. In this paper, we show that these techniques can theoretically be extended to a larger class of problems,...
This paper presents the simulation of a smart grid power dispatch. Smart Grids can be defined as a modern power system that monitors, protects and automatically optimizes the operation of its interconnected elements (central and distributed generators, transmission and distribution network, industrial consumers, energy storage devices and end-use consumers). The simulation is performed for a system...
This paper evaluates the dynamic behaviour of a system with different scenarios of generation and loads considering renewable distributed generation. The impact on protection subsystems and islanding detection is assessed in time-domain disturbance simulations that lead to islanding situations. Specifically, the simulations will be dedicated to model the dynamic behaviour of the system with Wind Power...
Interruptions in power supply, mainly due to the lack of generation adequacy and the discontinuity of distribution network operation, are significant inconvenience for customers connected to the power network. To quantify the duration of expected outages for customers of Polish power system LOLE and SAIDI indices were applied. The demand response program for customers most exposed to interruptions...
In this study, we analyzed the operational situation and cost for Tokyo Electric Power Company's service area by 2030, when a high penetration of variable renewable energy (VRE) sources will have been attained. Day-ahead unit commitment and real-time economic dispatch simulation were carried out by taking into account photovoltaic power yield forecasts and errors. The analysis allowed us to evaluate...
This paper presents considerations on the possibility to use thermoelectric generators at low temperatures to recover waste heat recovery applications, especially from geothermal energy. Thermoelectric generators have a satisfactory efficiency, when they are usually used in conditions with high gradient of temperatures. However, there are many applications, which lose important quantities of energy...
Zambia's national power grid is facing a constraint in meeting the present and expected future demand. Solar photovoltaic (PV) power is a promising option for large-scale renewable energy integration in Zambia as there is abundant insolation, averaging 5.5kWh/m2/day. However, large-scale integration of solar will increase the variability and uncertainty in the power supply, which can result in blackouts...
There are novel technical solutions and complex market roles in the energy market that cannot be associated with one single market participant and thus are difficult to be fitted into the current energy market environment. The article analyzes these assets and roles to help regulators encourage the spread of energy storage assets, enable demand-side flexibility and its appearance on the flexibility...
In this paper the zone controller is presented which regulates the reactive power-voltage characteristic (Q-V) of the zone pilot node by altering the reactive power outputs of power plants within the zone. As far as the zone is self-sufficient regarding reactive power needs, the generation is adapted to fit consumption and quasi-independent operation is achieved. As soon as limits are reached the...
This paper proposes a frequency regulation strategy applied to wind turbine generators (WTGs) in an isolated grid. In order to complement active power shortage caused by sudden load or wind speed change, an improved deloading method is proposed to solve inconsistent regulation capabilities in different speed regions and provide WTGs a certain capacity of power reserves. Considering the torque compensation...
Renewable Energy (RE) units especially grid connected Wind and Solar PV which have no rotational inertia are effectively displacing the conventional generators and their rotating systems. This reduces both the cost of generation and environmental effects. However, this has implications on the frequency stability in that frequency dynamics become faster with low inertia. This makes frequency control...
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