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Photovoltaic generators can provide several benefits for distribution networks, such as power loss reduction, and improvements in voltage level. However, high penetration of these generators can cause voltage rise problems in the distribution network. In this way, voltage control strategies are necessary so that the voltage levels are within the range of operation for any load and generation conditions...
This paper presents the decentralized Post-Primary Voltage Control (PPVC) scheme which is introduced within the Web-of-Cells (WoC) concept in the ELECTRA IRP project. The PPVC improves the traditionally known secondary and tertiary voltage control schemes to develop a robust method coping with the emerging intermittent generation and variable loading in the distribution system. PPVC aims to utilize...
The active residential DC distribution feeder operation under integration of distributed solar photovoltaic generations (DSPVG) is expecting poor voltage profiles due to increasing demand of SPVG and load. This paper discusses, the dynamic droop based coordinated controlled voltage regulation approach to address the rise/drop of voltage in an active DC power distribution system (DCPDS). Modern DCPDSs...
This paper proposes a reactive power flow control pursuing the active integration of photovoltaic systems in LV distribution networks. An alternative power flow analysis is performed according to the specific characteristics of LV networks, such as high resistance/reactance ratio and radial topologies. The proposed solution gives high performances, in terms of rms-voltage regulation, by estimating...
Photovoltaic embedded generation in low-voltage ac networks is quite popular; however, despite its benefits, there are some problems especially when photovoltaic (PV) penetration exceeds certain thresholds. Among others, voltage violation is of prime importance. Our review of the literature focused on PV penetration limits due to voltage violations in low-voltage (LV) networks. The review revealed...
Currently, major technical challenges linked to the implementation strategy of smart grids are associated with new studies and researches on the impact of renewables energy sources on the parameters of power transmission and distribution networks. Current dedicated softwares permit the modeling and simulation of power distribution structure which includes different types of renewable energy sources...
The increasing penetration of roof-top photovoltaic system has highlighted immediate needs for addressing power quality concerns, especially where PV generation exceeds the household demand. This study proposes an approach for optimal implementation of demand response in residential sector to eliminate voltage violations, especially during high PV generation periods. The proposed approach uses a load...
The paper deals with implementation of invertor Q/U function in photovoltaic power plants (PVP) in LV distribution network (DN). Discussed are individual modification and parameters of Q/U characteristics of PVP invertors. Based on result of simulations on existing LV distribution network in the DNCalc software, the benefit and possible risks of this function are evaluated from the view-point of further...
In this investigation, some strategies are presented for the optimized provision of reactive power by photovoltaic (PV) systems to perform voltage regulation in a low voltage distribution grid. The optimization is based on an optimal power flow algorithm that determines the minimum amount of reactive power needed for voltage regulation, also resulting in the minimization of losses in the network....
This paper proposes a voltage regulation method using distributed energy storage systems (ESSs) in low-voltage (LV) distribution networks with high penetration of rooftop photovoltaics. The impact of renewable based distributed generation units on feeder voltages is investigated in detail. The voltage regulation method consists of two stages. The distributed control is proposed in stage one to coordinate...
This paper describes the series compensation method based Energy management at micro grid. A series compensator is attached to series with the power supply. The proposed system which provides relating to specific difference between the supply voltage and resultant voltage. A compensator gets the energy from the power assist circuit. The power assist circuit which is used to deliver the power into...
Installation of single-phase rooftop photovoltaic (PV) systems in low voltage (LV) residential feeders without controlling their ratings and locations may deteriorate the overall grid performance including reversed power flows, high losses and unacceptable voltage profiles. Therefore, in recent years the utilities have adopted limitations on the maximum allowable number of PVs in LV networks. To overcome...
Voltage and power flow changes caused by Photovoltaic Generation (PV) source will emerge a new challenge towards a conventional distribution system. This study aims to measure the effect of PV source presence on voltage fluctuation disturbance occured in an electrical power transmission network. In this paper, 70 kV-voltage transmission systems were decreased to 10 kV-distribution feeders and modelled...
The paper presents a set of probabilistic functions based on stochastic RES (PV and Wind) forecasting and probabilistic load flow, which use the AMR (Automatic Meter Reading) infrastructure for data acquisition at MY Networks and the SCADA measurements at the MA" bus. More specifically, probabilistic functions are implemented, in order to provide improved monitoring of the system state, identification...
This paper analyses the 11 kV Medium Voltage (MV) networks using real network and load data. High penetration Photovoltaic (PV) connected to a MV feeder is modeled using RETScreen to estimate the output power based on meteorological and geographical data. Simulations are run across 24 hour period to see the voltage fluctuations, active and reactive power behavior, load profile, power loss and energy...
In this paper, DC power interchange is confirmed to reduce the battery damage by according to the fluctuations in the battery voltage in each micro grid. We investigated various conditions that constructed the DC power interchange system in two micro grids using the DC power flow controller. The experiment examined DC power interchange between two micro grids. As a result, it is able to expect that...
This paper describes a granular approach for investigating the impacts of very high PV generation penetration. Studies on two real-world distribution feeders connected to PV plants are presented. The studies include both steady-state and time series power flow analyses, which include the effects of solar variability. The goal of the study is to predict the effects of increasing levels of PV generation...
Recently, a large number of photovoltaic systems have been installed in the distribution system. Reverse power flow through the distribution line caused by photovoltaic generation results in the voltage deviation from the specified range. Usually, the photovoltaic system is controlled autonomously using an individual power conditioner. Autonomous control causes inequality of the photovoltaic generation...
This paper deals on control strategy and analyzing power flow between home integrated photovoltaic system (PVS), plug-in hybrid electric vehicle (PHEV) and distribution network The neutral point clamp (NPC) multilevel inverter is the main element that allows interfacing between the different energy sources and receptors. The combination of synchronous reference frames (SRF) and indirect control algorithms...
Integrating Photovoltaic (PV) systems with battery energy storage in the distribution network will be essential to allow for continued uptake of domestic PV system installations. With increasing concerns regarding environmental and climate change issues, incorporating sources of renewable energy into power networks across the world will be key for a sustainable future. Australia is well placed to...
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