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This paper reports simple and effective control logic for connecting abrupt, steep and short-term power sources (for example, regenerative power from electric railway vehicles) to distribution lines with renewable energy units connected. With conventional centralized control systems, power conditioner units were unable to keep voltage of the distribution line within an acceptable range when extremely...
A single phase transformer-less inverter is introduced in this paper. The negative polarities of the input voltage and output terminal have common ground. Therefore, the leakage current problem that is common in PV systems is eliminated naturally. In addition, the proposed inverter has fewer components compared with its counterparts and only one switch conducts during the active states which enhance...
Smart grid defines a modern power system with completely integrated, flexible and communicative power supply structure. It is becoming smarter by adding distributed energy sources, control and automation techniques and advanced information technologies resulting in increased degree of complexity. This complexity of smart grid systems brings along a new set of problems and it is imperative to address...
Micro-grid is defined as a local power network with distributed energy resources (DERs) as micro-power sources scattered throughout the supply area. For reliable and short range transmission of power, micro-power sources are controlled as standalone as well as grid-synchronized power sources. The idea is to design a resilient, efficient and cost effective infrastructure based on advanced communication...
During the last 2 decades natural gas became a very important source of energy. Consequently liquefaction of such gas became a mandatory process to allow shipping from production fields to customers. Very large liquefaction plants have been built and much more will be built in the next 10 years. The power of such plants is continuously increasing, at the same time environmental restrictions become...
This paper presents the optimal management of the reactive power in an offshore wind farm integrated into the main grid trough high voltage direct current (HVDC) with voltage source converters (VSC). The optimization problem is formulated by the definition of the objective function, which is the reduction of active power losses, and the constraints, that clearly determine the feasible solution space...
Traditional HVDC systems employ line commutated converters (LCCs) which are prone to commutation failures and feature significant harmonic distortion. Voltage source converter (VSC)-based HVDC systems have been employed to overcome these disadvantages, but their high switching frequency makes it difficult to scale to high power levels. Recently, a VSC topology named modular multilevel converter (MMC)...
Medium voltage permanent magnet synchronous motor (PMSM) driven subsea pumps have the potential to improve system efficiency and reliability to lower the operating costs, and reduce the subsea pump module (PM) weight and size. These subsea pumps can be deployed in the well, in a dummy well or on the mudline in a skidded configuration. The higher speeds achieved by such motors, compared to the same...
Due to the insignificant share of inverter-based Renewable Energy Resources (RER) as well as the uncertainty concerning their integration impacts, the capability of RERs to regulate voltage or frequency has not been widely used. However, inverter-based voltage/frequency regulation is of interest due to the fast growth of distributed RERs, especially solar Photovoltaic (PV) resources. The IEEE 1547a...
The rapidly rising penetration level of distributed generators (DGs) increases the risk of unacceptable voltages in distribution systems. The conventional voltage regulation devices are limited by physical constraints in their ability to perform voltage/var control in response to photovoltaic (PV) output fluctuations. However, the reactive power capability of PV inverters alongside with conventional...
This paper is the first part of a three-part consecutive series regarding the design of a new portable photovoltaic (PV) generation system used for teaching the energy conversion process of a real PV system. This design is to comply with a national effort known as the SunShot initiative which aims to leverage the awareness of renewable resources, particularly PV generation systems. The experimental...
Future growth in Distributed Energy Resources (DERs) present growing cybersecurity risks as these devices acquire increased networking and remote control capabilities. In this work the cyber-physical risks of consumer-grade DER are described. The work focuses on studying those DER devices that are network enabled and could be exploited by remote entities. Since attacks can range in both the access...
The emergence of clusters of rooftop Photovoltaic (PV) systems in Distribution Networks (DNs) might result into voltage rise that can exceed the voltage limits particularly in secondary systems. This paper assesses the performance of two smart inverter controllers (Volt-Watt and Volt-Var) to mitigate these technical problems. A large-scale DN fully modeled in OpenDSS is used in the assessment considering...
This paper describes the algorithms used for the implementation of the Master of Power (MOP), a device which performs both as a Power Plant Controller (PPC) and an Energy Management System (EMS), in a photovoltaic (PV) power plant. The PV plant includes a Battery Energy Storage System (BESS) based Uninterruptible Power Supply (UPS). Based on this system, the paper proposes the inclusion of a ramp-rate...
The aim of this work is to evaluate the impact of the incorporation of dynamic voltage support and reactive power injection requirements in PV systems connected at Provincial Interconnected System(PIS) of San Juan-Argentina projected up to the year 2024 under different levels of penetration. To this aim, the calculation of a severity indexes is proposed. It can be concluded that the capacity to withstand...
The paper describes the instantaneous control technique of a two stage Power Conversion System interfaced to an energy storage equipment. The control aims at regulating the active and reactive power exchange between the grid and the converter during the battery discharge and charge operations. The results of the control implementation in a Simulink® model of the Power Conversion System are compared...
Every year the popularity of the net metering system, for small producers of energy in the Brazilian electric system is increasing fast driven by the Normative Resolutions REN 482/2012 and REN 687/2015 of the National Electricity Agency (ANEEL). These resolutions can encourage investment in the sector and create the growth of renewable energies in the energy matrix through distributed generation (DG)...
This paper presents a new mathematical model for the power losses of the PV inverters for various PFs using the datasheet of the PV inverter manufacturer and basic knowledge of power electronics and semi-conductors. The mathematical model uses as parameters the input and output power of the inverter, the PF (inductive or capacitive), which the inverter operates at, and the efficiency curve of the...
This paper presents a method to shed off the least important loads in a microgrid operated at constant frequency under the contingency of inadequate power generation. Different from conventional frequency deviation based load shedding, this paper discusses in detail how to shed off load based on the voltage deviation. The key issue is to differentiate whether the voltage deviation is due to sudden...
According to the requirement of the power factor and the dynamic performance of the asynchronous machine tool field, an asynchronous motor inverter with active power factor correction is proposed. The proposed inverter is a 3kW asynchronous motor drive control platform. At first, the proposed single phase converter with APFC is realized by using the MATLAB/SIMULINK. Then, the boost APFC is designed...
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