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With huge penetration of distributed generators (DGs), distribution systems become more and more active and flexible. To accommodate DGs in a much more optimal way, cooperation between transmission networks and distribution networks, even distribution networks and distribution networks, should be further strengthened. A cooperative sequential reconfiguration method is proposed in this paper, which...
Day-Ahead Unit Commitment is a typical business process of regional transmission organizations (RTO) and some vertically integrated utilities to ensure enough generation capacity is committed day-ahead to meet the load for the next day. In many cases, transmission constraints are required to be taken into consideration under the framework of security-constrained unit commitment (SCUC). Transmission...
Most electrical vehicles are charged via an electrical grid connection, even if PV is present (“solar carport”). Elevated interface costs (connection, metering, billing) inhibit mass distribution of solar carports, so direct PV-use should be preferred. The charge received from a solar carport is usually sufficient for a typical home-office-home commuting. The ability of E-vehicles to be connected...
In the current work the implications of distribution networks reconfiguration on the system operation were investigated. Different technical issues such as voltage profiles, line loading, and On-Load Tap Changer (OLTC) were tested through the switching state optimization of the network. The simulations were conducted based on load and renewable energy based generation profiles. Different day types...
This paper proposes a strategy of power loss reduction of radial distribution network with distributed generator (DG) integration based on a fuzzy multi-objective method in order to improve the distribution system efficiency. Multi-objective functions are considered for power loss reduction, minimization of bus voltage deviation, and maintaining the load balancing among the feeder of distribution...
The distribution system has high r/x ratio results into higher power loss. To minimize the active power loss optimal placement of DG is an important factor. This will improve the voltage profile of each node. In this paper network reconfiguration and DG placements are considered. The minimization of operating cost of distribution network operator is considered. To find out the optimal location of...
This paper presents a heuristic method to solve the network reconfiguration problem in the presence of distributed generation (DG) in order to minimize energy losses and improve the performance indexes in distribution system. Topological reconfiguration corresponds to an important tool for planning and operation of electric power distribution systems. Considering the distribution operation planning,...
In this paper we propose a novel control architecture to manage a large fleet of thermal loads and adjust traditional power plant generation setpoints for reference tracking and production costs minimization. The time scales considered are determined by sampling times of a few seconds and control horizons of a few minutes. The control architecture consists in a model predictive controller (MPC) combined...
As the interconnection of power grids, failure of single component could propagate out, and because of the scale of the power system, it is almost impossible to analysis all failure patterns. Traditional methods for online cascading analysis could face almost unsolvable obstacles on computational burden and accuracy. This paper discusses the mechanisms of early warning of cascading blackouts. Researches...
Research in modern helicopters is targeted into the increase of their efficiency due to economical and ecological pressures. This paper introduces two innovative methods of absorbing a ratio of the energy remains of the main engine exhaust gases and converting it to electrical energy. The recovered power is then injected to the electrical bus of the helicopter through power electronics converters...
This paper presents the design of the advanced voltage management system (AVMS) including manual operation mode in order to control reactive power generations in practical power system. The existing secondary voltage controller (SVC) has a demerit occurring large transient phenomenon shortly after the SVC begins to work. This malfunction results from the difference of the operation status before and...
It is of prime importance to introduce a large amount of distributed generators in order to solve the energy and environmental issue. In distribution network with a large amount of distributed generators, it becomes difficult to maintain the system voltage within an allowable range. Thus, we have developed a new voltage control method using reactive power control of system connection inverter. Especially,...
Numbers of large and medium size embedded generators, which are working as paralleled with the main in distribution system, are increasing rapidly. Since the existing generation, transmission and distribution systems are planed based on Centralized Generation with no considering of embedded generators, some adverse consequences and problems are initiated in power system control and protection. One...
In this paper a hybrid differential algebraic equations (HDAEs) approach is developed for modeling interconnected power networks. After some theoretical aspects, the differential algebraic equations (DAEs) that describe the dynamics of a 4-Bus power network is obtained. Then a HDAEs model is proposed to simulate the hybrid behavior when the line tripping of one of the network lines occurs, making...
This paper proposes a methodology based on fuzzy multiobjective and tabu search to determine the optimal on/off patterns of tie and sectionalizing switches for feeder reconfiguration in a distribution system with distributed generators. Three main objectives considered in the feeder reconfiguration problem consist of power loss, feeder load balancing, and number of switching operations of the switches...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
We propose QUEST (QUality ESTimation), a new method that accurately estimates IEEE 802.11 wireless link quality with no in-band signaling overhead. Existing link quality estimation methods either are based on hello exchanges by fixing or varying transmission rates or rely on the history (e.g., delivery ratio) of previously sent data packets in a per-rate/-neighbor manner. QUEST on the other hand,...
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