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A microgrid (MG) is a secondary (low voltage) network capable of supplying part or all the power needed by the connected users. It is composed by solar panels, energy storage devices, diesel plants, microturbines, and all other distributed generation technologies available for connecting to the low voltage grid. In this paper, a MG model is presented to minimize operation cost during a 24-hour period...
As photovoltaic (PV) integration increases in distribution systems, an effective way of assessing the maximum allowable PV integration capacity is urgently needed. In this paper, a new method is proposed to evaluate the maximum PV integration capacity with AC power flow limits, and the effect of topology reconfiguration on PV integration is also considered. In addition, the single commodity flow constraint...
In this work an algorithm to control the power flow of an electric power system with two integrated energy storage systems is investigated. The power system under consideration consists of a conventional distribution feeder that supplies the power to satisfy the customers' demand, a set of photovoltaic (PV) panels that also contribute to the power generation, one unit of Lithium-Ion battery storage...
Photovoltaic (PV) generation is increasingly popular in power systems. The nonlinear dependence associated with a large number of distributed PV sources adds the complexity to construct an accurate probability model and negatively affects confidence levels and reliability, thereby resulting in a more challenging operation of the systems. Most probability models have many restrictions when constructing...
Variable over voltage, excessive tap counts, and voltage regulator (VR) runaway condition are major operational challenges in distribution network while accommodating generation from photovoltaics (PVs). The conventional approach to achieve voltage control based on offline simulation for voltage set point calculation does not consider forecast errors. In this work, a stochastic optimal voltage control...
This paper investigates the use of metaheuristic evolutionary algorithms to increase simulation accuracy of faulted large scale PV systems. The selected algorithm has been utilized innovatively to extract the internal parameters of the solar cell in fault conditions. PV power plants are subjected to faults and failures typically which requires fast and precise diagnosis. For large scale PV plant,...
Extensive penetration of single phase distributed generators (DGs) such as photovoltaic generations may cause serious phase unbalance problems in distribution networks. The phase unbalance condition will make voltage/VAR optimization problem difficult to be solved by using traditional model and methods for balanced distribution networks. A three-phase unbalanced voltage/VAR optimization model for...
The adoption of residential-scale low carbon technologies, such as photovoltaic panels or electric vehicles, is expected to significantly increase in the near future. Therefore, it is important for distribution network operators (DNOs) to understand the impacts that these technologies may have, particularly, on low voltage (LV) networks. The challenge, however, is that these LV networks are large...
Maximum power point tracking (MPPT) is a key feature of photovoltaic systems as it enables these systems to be utilized with a higher efficiency. Many MPPT methods including conventional techniques for uniform conditions and advanced techniques for non-uniform conditions have been proposed in the literature. A Simulated Annealing (SA) based MPPT method is a good candidate for tracking the global peak...
In this study, we investigate the impact of the dynamic behavior of photovoltaic (PV) power generation systems on short-term voltage stability of the transmission system. First, the impact of the fault ride-through capability of a PV model is studied by setting several recovery speeds of the active current output when the operation of the PV system is interrupted because of a voltage sag. The results...
Due to the increasing adoption of domestic photovoltaic (PV) systems, the use of technologies such as on-load tap changer (OLTC)-fitted transformers, capacitor banks, and remote monitoring are being considered to mitigate voltage issues, particularly in European-style low voltage (LV) networks. Depending on the control strategy, however, the effects on customer voltages and control actions (e.g.,...
In this paper, a small signal model has been developed for a grid connected photovoltaic (PV)-diesel engine (DE) system feeding also to an induction motor at the low voltage level. The comprehensive mathematical model of the system has been developed by linearizing the system of equations around an operating point. To analyze the stability of the system, the eigen values and thus the modes of the...
With the increased environmental concern, the photovoltaic (PV) generation capacity is growing in today's power systems. As the PV penetration rate increases, the intermittency and uncertainty of PV systems will cause frequency regulation issues. When rapid fluctuations take place, the system requires fast responding regulation to recover the frequency within a short period of time. Traditional power...
As PV penetration on the distribution system increases, there is growing concern about how much PV each feeder can handle. A total of 216 medium-voltage distributions feeders have been analyzed in detail for their individual PV hosting capacity and the locational PV hosting capacity at all the buses on the feeder. A statistical analysis is performed on the hosting capacity results in order to compare...
The Australian electricity industry is facing significant challenges, as recent electricity price rises and technological change have lead to changing demand patterns and high penetrations of distributed photovoltaics. Network tariff reform is underway in response to concerns about overinvestment in network infrastructure and cross-subsidies present in existing tariff structures. In this paper, residential...
With increasingly widespread utilization of photovoltaic (PV) systems, the stochastic characteristics of the PV generation may bring new challenges to security and reliability of the power system operation. This paper proposes a novel spinning reserve requirement optimization model considering the impacts of large-scale photovoltaic generation penetration. The effects of forecast error of PV generation...
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 view of the advance of dynamic wireless power transfer (DWPT) for electric vehicles (EVs) charging, integrated DWPT systems are conceivable to emerge. However, quasi-continuous and time-varying DWPT charging loads bring large challenges to the power flow analysis of integrated DWPT systems. In this paper, a sequential load model is proposed to describe the temporal dependency of DWPT charging demands...
The aim of a future electric power generation without CO2 emissions requires a rethinking of today's electrical power system. One important aspect is renewable energy sources. Thereby, wind power and photovoltaic units have the biggest growth rates, even though there generated power is volatile and do not correlate to the actual load situation. As a consequence of weather conditions, the generation...
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