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Microgrid research and development in the past decades have been one of the most popular topics. Similarly, the photovoltaic generation has been surging among renewable generation in the past few years, thanks to the availability, affordability, technology maturity of the PV panels and the PV inverter in the general market. Unfortunately, quite often, the PV installations are connected to weak grids...
With rapid increase of photovoltaic (PV) penetration in distribution system, and the fact that distributed generators may involve in voltage regulation according to IEEE standard 1547, it is necessary to check the stability of PV generator integration, especially utility PV farms. To apply generalized Nyquist Criteria (GNC) based on impedances on D-Q frame, output impedances of PV farm is derived...
As negative incremental resistance caused by constant power behavior of power converters may bring stability problem to distributed systems, stability of PV integration to distributed system attracts more and more attention. Compared to the widely used positive impedance method, D-Q Frame impedance matrix method is more accurate for integration of PV generator that has non-symmetrical control in DQ...
Power quality is an important issue for wave energy developers, as the wave energy converters output power profile can present fluctuations in the range of seconds, due to the oscillatory nature of the ocean waves. The impact of these devices on the electric grid hence needs to be investigated for wave farms to be connected to the grid. In order to emulate an operating direct drive wave energy converter,...
This paper presents a converter-based permanent magnet synchronous generator emulator as a testbed for designing, analyzing, and testing of the generator drive and its control system as an actual device under test. The permanent magnet synchronous generator model is formulated in a real-time digital simulator. A voltage type ideal transformer model combined with a virtual impedance is presented as...
The objective of this paper is to provide a method for steady-state short-circuit analysis in power networks with distributed energy resources (DERs). For this purpose, we suggest an approach that takes into account the impact of current controlled DERs in the fault analysis. The current controlled DER has some characteristics that we should consider–1) DER's large filter inductance and 2) the limit...
Generator protection misoperations may intensify a disturbance or even lead the power system to a major outage, especially when it occurs in a large power plant. Additionally, the power system expansion changes the short circuit currents and, thus, from time to time the system requires a re-evaluation of protection coordination. In this paper, Itaipu power plant's modeling, analysis and coordination...
The paper presents topics about the connection of two single-phase inverters with different power capabilities connected in parallel to supply linear loads. The equations of difference related to control and modelling are programed in an embedded DSP 320TMS28F335 system. The model of synchronization of Phase Locked Loop (PLL), the measurement of active and reactive power and the selected control strategy...
The recent development of dispersed generation leads to fact that distribution grids have to deal with the bidirectional power flow which may cause voltage rise above permissible level. Currently used voltage regulation scheme cannot completely and successfully cope with this problem. As a result of the further increasing penetration of distributed generation, the new voltage regulation system will...
Microgrid allows flexible integration of distributed generation using renewable energy sources into the conventional centralized power system with the additional benefit of islanded mode operation Research efforts on DC microgrids have gained momentum in the recent years, mainly due to its inherent advantages compared to AC microgrids. Several DC renewable energy sources are connected to a common...
This work studies the modeling and control of a six-phase generator and rectifier unit in MVDC systems. The design approach for the generator's automatic voltage regulator (AVR) is developed based on the generator's linearized models. The dc terminal impedance of the generator-rectifier unit is derived based on system analysis and numerical approximation. Further, the dc terminal impedance of the...
The number of applications for Distributed Generation (DG) interconnections received by utility system operators is increasing every year. As the various DG technologies mature and the cost per kilowatt of generation goes down, utilities may receive more applications for generation interconnections large enough to require detailed system impact analysis before approval. Many utilities are already...
Droop control methods are widely used in dc microgrids due to its simplicity and easy implementation. However, DC bus voltage deviation increases as the droop gain increases although accuracy of power sharing is improved. In order to overcome this paper proposes an improved voltage regulation method under high droop gain circumstance with consideration of cable impedance. It allows accurate power...
This paper investigates a controller that ensures minimum operating dc-link voltage of a back-to-back converter system. The dc-link voltage adapts its reference based on the system state, reference given by an outer loop to the dc-link voltage controller. The operating dc-link voltage should be kept as low as possible to increase the power conversion efficiency and increase the reliability of converters...
A biomedical stimulator with four high-voltagetolerant output channels, combined with on-chip positive high voltage generator, is proposed. For the purpose of integration with other circuit blocks into a system-on-chip (SoC) for cochlear implant biomedical applications, this design has been realized with the 1.8-V/3.3-V transistors in a 0.18-µm CMOS process. This stimulator only needs one single supply...
Technological advancement in renewable energy systems and government incentives like Feed In Tariff Program for green electricity generation is motivating utilities around the world to upgrade their existing distribution system infrastructure in order to accommodate increased wind power and photovoltaic (PV) solar power based distributed generation (DG) systems. This paper presents the effect of Distributed...
The penetration of distributed generation (DG) in electrical power systems is rapidly increasing these days and more attention is drawn to maintaining a healthy distribution system. Islanding operation of DG is one of the biggest challenges. When Islanding occurs, the power supply from the main grid is interrupted which may cause a problem when distributed generators keep providing power into the...
This paper presents a control method that reduces the losses in wind turbine converters adaptively controlling the grid converter. The dc-link voltage adapts its reference based on the system state and therefore reduces the stored energy, and is therefore kept at the minimum necessary for the grid and generator side. Operating in this way, the electrical and thermal stress factors are decreased on...
This paper presents a micro-grid simulator tool useful for implementing and testing multi-agent controllers (SGridSim). As a common engineering practice it is important to have a tool that simplifies the modeling of the salient features of a desired system. In electric micro-grids, these salient features are the voltage and power distributions within the micro-grid. Current simplified electric power...
Energy storage can be employed in a variety of compact electrical power system applications to meet peak load demand, maintain power quality during network disturbances and variable load conditions, and to increase overall system efficiency. Within the literature to date, the development of control and management strategies of energy storage for these applications has focussed on normal network operation...
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