Topic
Power-flow study
About: Power-flow study is a research topic. Over the lifetime, 8091 publications have been published within this topic receiving 155053 citations. The topic is also known as: load-flow study.
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TL;DR: In this article, an extensive study of renewable energy communities and their potential impact on the electric distribution grid has been carried out, where a linear programming optimization model sizing the energy community's photo-voltaic and battery energy storage system was developed.
38 citations
TL;DR: In this article, a model of a two area, two generator power system is simulated and the effects of changing the processing of area control error (ACE) and sampling times are studied.
Abstract: This paper presents a discussion of regulation error in the load frequency control of a power system. It suggests that good control of a power syspm is more dependent on system constraints and human decisions than on the design of the present day load frequency controller. A model of a two area, two generator power system is simulated and the effects of changing the processing of area control error (ACE) and sampling times are studied. It is found that good control can always be obtained with the proper tuning of parameters and some of these results are presented. Some of the system constraints and operator decisions that can cause regulation error are discussed.
38 citations
TL;DR: A serial-parallel hybrid (SPH) fuel cell system which include control and protection loops are presented in this article, and the main advantages of the selected converter are its voltage step up and step down properties, high efficiency, and low input and output current ripples.
Abstract: In this paper, a serial–parallel hybrid (SPH) power system formed by a fuel cell (FC), an auxiliary storage device (ASD), and the current-controlled dc–dc converters responsible for the power management are realized by using the digital signal controller (DSC) TMS32F28335 The main energy management goal is to transfer energy from the sources (FC or ASD) to the load while ensuring dc bus voltage regulation and high power conversion efficiency In addition, a safe and reliable operation of the system has to be achieved The selected converter and its controller features are noninverting voltage step up and step down, high efficiency, regulation of input and output currents and low ripple values, and the ability to change from input to output current regulation loop, suddenly and smoothly, and vice versa All these features allow it to be positioned in different FC system localizations and simplify the design of the master control Simulation and experimental results have been validated on a 48-V 1200-W dc bus
38 citations
01 Nov 2008
TL;DR: In this paper, a small-signal stability analysis of a power system with high PHEV penetration is performed, and the results indicate that when the PHEVs are charged with a constant-current technique, the grid is more prone to instability.
Abstract: Depending upon the charging technique, fleets of PHEVs integrated within the power grid behave as constant power loads (CPL) or constant impedance loads (CIL). In this paper, a small-signal stability analysis of a power system with high PHEV penetration is performed. The results indicate that when the PHEVs are charged with a constant-current technique, the grid is more prone to instability. Consequently, operating PHEVs as CILs can increase their maximum penetration levels before the system becomes unstable.
38 citations
TL;DR: case study results demonstrate that the algorithm is applicable and effective for the steady-state analysis of several operational factors associated with an isolated hybrid microgrid system: 1) load changing; 2) converter outages; and 3) the probabilistic nature of renewable generation and loads.
Abstract: This paper proposes a novel branch-based load flow approach for isolated hybrid microgrids. This evolving network configuration involves the application of a distinctive operational philosophy that poses significant challenges with respect to conventional load flow techniques. Hybrid microgrids are characterized by small-rating, droop-based distributed generators (DGs) and by variable but coupled frequency and dc voltage levels. In particular, the absence of a slack bus that results from the small DG rating impedes the application of traditional techniques such as branch-based methods. To overcome these limitations, a modified branch-based approach provided the basis for the development of the proposed algorithm. The new algorithm solves the load flow sequentially by dividing the problem into two coupled ac and dc subproblems. The coupling criterion is established by modeling and updating the power exchange between the subgrids, hence enabling an accurate and efficient formulation of the subproblems. For each subproblem, a modified directed forward-backward sweep has been developed to perform the load flow analysis based on consideration of the individual characteristics of each subgrid. Case study results demonstrate that the algorithm is applicable and effective for the steady-state analysis of several operational factors associated with an isolated hybrid microgrid system: 1) load changing; 2) converter outages; and 3) the probabilistic nature of renewable generation and loads.
38 citations