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With the increasing capacity of grid-connected PV power grids, photovoltaic power generation systems that are connected to the utility grid have shown increasing competitiveness. When the voltage drop occurs due to power short circuit fault, a Low Voltage Ride Through(LVRT) Technology is proposed to improve the stability of the power system. This work, based on the research of PV grid-connected inverter...
The study of low voltage ride through of photovoltaic power generation system mainly focuses on the two aspects: the appropriate control strategy and the addition of external hardware devices. In this paper, a hybrid control method is proposed to improve the low voltage ride through (LVRT) capability. Fault conditions, rapid suppression of voltage fluctuation of photovoltaic power generation system...
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...
The objective of the paper is to present the modelling of the single phase grid connected Photovoltaic (PV) generation and its impact on low voltage grid. The network model has been developed in PSCAD software. The designed system includes low voltage network, single phase voltage source inverter (VSI) to control active (P) and reactive power (Q) flow to the grid and PV panel as the main source of...
For low voltage ride through (LVRT) issue of grid-connected photovoltaic (PV) system, a LVRT control strategy based on reactive power compensation is proposed. During the grid voltage sags, the maximum power point tracking (MPPT) control strategy of the PV array is improved to reduce the generated power. At the same time, the control strategy of reactive power compensation is adopted to prevent the...
This paper proposes a low voltage ride through (LVRT) control strategy for energy storage systems (ESSs). The LVRT control strategies for wind turbine systems and photovoltaic systems have been researched until now. Regardless of the energy source, the main aim of the LVRT control strategies for a grid side converter is to inject the reactive power according to the gird code regulations. The main...
This paper describes the impact on the voltage profiles of a secondary distribution network in the presence of Small Scale Distributed Generation (SSDG) units. The Penetration Levels of these SSDG units are varied and the effect on the voltage is simulated and analysed. The study also describes how the size of each SSDG unit affects the maximum penetration level of SSDG in the low voltage network...
This paper shows that the smart loads could be effective in mitigating voltage problems caused by photovoltaic (PV) generation and electric vehicle (EV) charging in low voltage (LV) distribution networks. Limitations of the previously reported smart load configuration with only series reactive compensator (SLQ) (one converter) is highlighted in this paper. To overcome these limitations, an additional...
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....
Electrical distributors in Australia are experiencing high penetration levels of small scale distributed generation, such as solar photovoltaic systems, particularly being installed on houses that are connected to the Low Voltage network. Distributed generation is challenging the traditional operating paradigm and can result in occurrences of voltage rising to the point where it goes above safe limits,...
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...
The integration of decentralized energy resources is associated with new challenges for the operation of low voltage distribution grids. At the same time, the interconnection of these systems offers large potential for providing smart grid services to increase power quality and grid stabilization in areas with a high penetration of renewable energy sources. Therefore, new operation strategies for...
The adoption of on-load tap changer (OLTC)-fitted transformers in low voltage (LV) networks is increasingly being considered to mitigate voltage issues resulting from high penetrations of photovoltaic (PV) systems. However, depending on the corresponding voltage control strategy, tap operations can be significant, accelerating the ageing of the OLTC. This work assesses the performance of different...
Adopting on-load tap changer (OLTC)-fitted transformers in low voltage (LV) networks can be a potential solution to counteract voltage rise caused by high penetrations of residential photovoltaic (PV) systems. To efficiently control the OLTC network monitoring might be considered. This work assesses the performance of a proposed OLTC control logic considering different remote monitoring schemes and...
First, we investigate the technical and economic potential of autonomously operating voltage control strategies in low voltage grids with high photovoltaic penetration. The investigated control strategies are based on the reactive power control capabilities of modern photovoltaic inverters and the application of distribution transformers with onload tap changers. We present a methodology for assessing...
Increasing photovoltaic (PV) penetration is a major driver for developing new methods to integrate renewable generation into distribution systems. For planning of low voltage distribution networks future share of penetrations have to be modeled in an appropriate way, to simulate and analyze the impact of PV generation. Different approaches to model high penetration scenarios - in particular defining...
This paper presents a system photovoltaic BPSX-60 in order to have continously electricity supply for low voltage grid. Output photovoltaic BPSX-60 is controlled by dc-dc boost converter to produce maximum power in order to obtain the MPP (Maximum Power Point). Output of the converter is controlled by fuzzy logic to obtain the MPP (Maximum Power Point) photovoltaic BPSX - 60, thus the efficiency photovoltaic...
Based on existing low and medium voltage grids from distribution system operators and future scenarios of PV and EV penetration, critical load scenarios which lead to violations of relevant KPIs are to be developed in the scope of PlanGridEV. In the course of the gap analysis the expected limits of DER hosting capacities were identified. The method for developing and simulating the different scenarios...
The increasing adoption of domestic-scale photovoltaic (PV) systems in the UK is likely to bring significant technical voltage rise issues in low voltage (LV) networks. This work investigates the techno-economic benefits from using onload tap changers (OLTC)-fitted transformers to cope with high penetrations of PV. Two voltage regulation approaches are considered: local (busbar) and remote (furthest...
Dispersed photovoltaic generation integrated in the low voltage distribution grids leads their operation towards an active approach. In that context, new methodologies are needed in order to identify and to accurately quantify the impact of this massive renewable penetration on the grid operation. For this purpose, the authors of this study have developed in a previous analysis a probabilistic load...
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