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Decomposing apparent power and Losses in Distribution Systems with Nonlinear Loads

Transactions of Tianjin University 2008年第2期14卷 134-138页

作者：王葵潘贞存陈旭升 School of Electrical Engineering Shandong UniversityJinan 250061China Department of Electrical and Computer Engineering Seattle UniversitySeattleWA98122-1090USA

The definition of reactive power for non-sinusoidal conditions is a controversial *** mathematical treatment of nonlinear loads in power systems is also *** paper starts with the decomposing of apparent power in the cases of linear and nonlinear *** harmonics are present,apparent power is composed of active power,reactive power,and disturbed reactive *** element can be defined as the element without disturbed reactive *** definition is based on a practical engineering concept which can separate the contribution from the apparent power into utility-duty part and custom-duty *** field investigation of home-used facilities was *** the data acquisition in the 0.4 kV distribution systems was ***,the loss increase due to the nonlinear loads was *** loads can be a dominant effect with respect to reactive power and power *** data from a number of nonlinear load types indicate that the disturbed reactive power can cause significant losses in utility supply systems.

关键词： harmonic apparent power real power reactive power disturbed reactive power Josses

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SMOGN,MFO,and XGBoost Based Excitation Current Prediction Model for Synchronous Machine

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Computer Systems Science & Engineering 2023年第9期46卷 2687-2709页

作者： Ping-Huan Kuo Yu-Tsun Chen Her-Terng Yau Department of Mechanical Engineering National Chung Cheng UniversityChiayi62102TaiwanChina Advanced Institute of Manufacturing with High-Tech Innovations(AIM-HI) National Chung Cheng UniversityChiayi62102TaiwanChina

The power factor is the ratio between the active and apparent power,and it is available to determine the operational capability of the intended circuit or the *** excitation current of the synchronous motor is an essential parameter required for adjusting the power factor because it determines whether the motor is under the optimal operating *** the excitation current should predict with the experimental devices,such a method is unsuitable for online real-time *** artificial intelligence algorithm can compensate for the defect of conventional measurement methods requiring the measuring devices and the model optimization is compared during the research *** this article,the load current,power factor,and power factor errors available in the existing dataset are used as the input parameters for training the proposed artificial intelligence algorithms to select the optimal algorithm according to the training result,for this algorithm to have higher *** SMOGN(Synthetic Minority Over-Sampling Technique for Regression with Gaussian Noise)is selected for the research by which the data and the MFO(Moth-flame optimization algorithm)are created for the model to adjust and optimize the parameters *** addition to enhancing the prediction accuracy for the excitation current,the automatic parameter adjusting method also allows the researchers not specializing in the professional algorithm to apply such application method more *** final result indicated that the prediction accuracy has reached“Mean Absolute Error(MAE)=0.0057,Root Mean Square Error(RMSE)=0.0093 andR2 score=0.9973”.Applying this method to themotor control would be much easier for the power factor adjustment in the future because it allows the motor to operate under the optimal power status to reduce energy consumption while enhancing working efficiency.

关键词： Synchronous machine power factor excitation current active power apparent power

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Different Options Regarding power Components in Electric Circuits

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Journal of Energy and power Engineering 2012年第10期6卷 1673-1679页

作者： Alexander Osnach Department of Optimization of Electricity Supply Systems Institute of Electrodynamics National Academy of Sciences Kyiv 03680Ukraine

This paper describes two methods of representation of voltages and currents in electric circuits： in the vector form and in the shape of oscillations, represented as diagrams in the plane. The appropriate power components are discussed depending on the representation of voltages and currents. Special attention is paid to the instantaneous power peculiarities for diverse loads and non-sinusoidal conditions. A case study of power calculations in an electric circuit with a pluggable capacitor is presented. For these types of transient modes, the instantaneous power is represented in the form of active and reactive components. Calculation of active, reactive, and exchange powers for steady-state processes is presented.

关键词： apparent power active power reactive power instantaneous power non-sinusoidal conditions exchange power.

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Economic Improvement of power Factor Correction: A Case Study

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Journal of power and Energy Engineering 2021年第6期9卷 1-11页

作者： Kassem Wahab Mohamad Rahal Roger Achkar Department of Computer and Communications Engineering Faculty of Engineering American University of Science and Technology Beirut Lebanon

power factor (PF) is simply an expression of energy efficiency, which is always expressed in terms of percentage. Technically, PF is a ratio of real power in Kilowatts to the apparent power, which is always expressed in kilovolts amperes. In AC power analysis, power is always expressed in three ways, the real power (P), reactive power (Q), and the apparent power (S). The real power is the work useful power, while the reactive power is the wasted power in the 3-phase AC system, and the apparent power is the vectorial sum of the two powers. The increase of reactive power will reduce the presence of real power, thus making the power to be more expensive. In this paper, we will analyze the importance of improving the power factor by applying a bank of capacitors to a case study in Lebanon. Analysis of the economic improvement in the application of power factor correction is carried out. The result shows a reduction of 12 percent in the total cost.

关键词： power Factor Reactive power kVAR Inductive apparent power Active power

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