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The increasing penetration of renewable energy sources in power systems has increased the amount of generating units employing power electronics as their grid interface, instead of synchronous generators. Their different dynamics have brought new challenges for power system operators; in particular, the reduction of the total inertia of power systems, which leads to larger frequency disturbances....
In this paper, a variable dc bus control strategy is evaluated for a bidirectional grid connected electric vehicle (EV) charger topology. The EV charger under consideration comprises of an ac-dc 3-φ active rectifier stage followed by a dc-dc dual active bridge (DAB) converter. The voltage of the common dc-link between the ac-dc stage and the dc-dc stage is regulated such that it follows the voltage...
This paper presents a novel zero-voltage-switching approach for predictive boundary conduction mode PFC converter for LED lighting. In the proposed method, instead of being detected by a sensing circuit, the switching off-time for achieving zero-voltage-switching is determined by analytical equations of PFC converter. Therefore, the efficiency reduction caused by sensing circuit can be eliminated...
Management of Renewable Static Synchronous Generation units based on Synchronous Power Controller (RSSG-SPC), not only provides grid synchronization without using PLL and gives proper dynamic to output active power, moreover yields simple solution to overcome technical constraints on these units. Control of active power level injected to the grid is one of these key constraints which can overcome...
The high penetration of renewable energy sources in electrical distribution networks is giving rise to new challenges in the low voltage network operation. Power electronics converters are widely used to connect these energy resources to the grid, and the control technique that emulates the operation of synchronous generators is attracting the attention of researchers in recent years. Such converters...
In daytime operation the power converter of a photovoltaic installation is generally used below its rated power. It could then provide reactive power support to the grid. This operation is called PV-STATCOM. This work provides an evaluation of the technical cost of operating a PV-STATCOM during daytime. This technical cost is due to the need of buying active power from the grid to supply extra losses...
In this article, a current control algorithm is conceived for converting solar dc power into ac power of high-quality. This conversion is based only on a dc-ac converter, avoiding the use of two stage converter. The proposed algorithm is founded on tracking the maximum power point which ensures controlling the electrical power exchanged with the grid. To assure a good dynamics and reduce the control...
This paper presents a new structure of a power sharing controller for a modular based dual active bridge (DAB) DC/DC converter. The modular topology is based on input-series output-parallel (ISOP) connection of DAB modules suitable for a voltage step down application at medium voltage level. Since DAB has bi-directional power flow capability, this connection would act as its dual input-parallel output-series...
Conventionally power flow of transmission and distribution network is calculated separately. With the increasing penetration level of distributed generation (DG), such as photovoltaic and wind power, voltage and power characteristics of tie bus become complicated. The tight coupling problem appears between transmission and distribution network. As a consequence, the power flow calculation must be...
With the steady transition towards a more dominant decentralized power generation and the further reduction of conventional fossil fuel-based power plants, future utility grids require higher demands regarding voltage quality and supply reliability. Active power filters with energy storage capability, here referred to as Power Conditioning Systems (PCS), offer grid supporting and stabilizing measures...
Microgrids are a growing trend toward a new power distribution system that allows for a high penetration of renewable distributed generation, electrical energy storage systems and controllable loads. This modern concept exploits the advances in electronic technology to improve efficiency, reliability, and flexibility, while reducing cost and size. Furthermore, microgrids can operate in a grid-connected...
This study developed a methodology to determine zones of acceptable voltage profiles for wind power generation connected to distribution systems. Three load profiles (residential, commercial and industrial) connected to the distribution network were analyzed considering the impact on voltage levels and steady-state stability for different wind speeds and wind generator control strategies. The wind...
Solar photovoltaic (PV) renewable energy systems are undergoing major technological developments and large-scale field deployment and electric grid integration. This paper proposes a method of expanding the capacity of an existing irrigation farm with additional pumps powered by solar PV. The system includes PV arrays and battery energy storage connected to a common dc bus, which energizes an array...
The increase in penetration levels of distributed generators like PV and Wind in a distribution system makes the IEEE 519 standard to be a vital aspect towards power quality. The network resonance has been described by IEEE 519 as a major contributor towards the harmonic distortion. Non-linear loads such as transformers, machines, silicon-controlled rectifiers (SCRs), solid state devices, power transistors,...
This paper presents analysis of the non-isolated DC/DC triple active bridge (TAB) converter under various purely inductor-based AC link topologies. The objective of the analysis is to find the topology that incorporates the least value of the AC link inductors which leads to reduced converter footprint in addition to minimum internal current stresses. Modelling of the TAB under each of the different...
This paper investigates a distributed consensus control design for heterogeneous energy storage devices in smart grids. Using communications between energy storage devices in the system, primary and secondary voltage/frequency control are achieved. The primary voltage and frequency synchronization is achieved by equally sharing the active and reactive powers among energy storage devices. The secondary...
In the utility system, the most popular fault is 1 line-to-ground fault. It causes the imbalance voltages and currents in 3-phase power system. This paper presents the novel unbalanced fault detection by using the very fast real time symmetrical coordinate transform from the memorized 3-phase voltage data before 1 sampling time. This paper presents some characteristics of the very fast real time symmetrical...
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