Current Issue : April - June Volume : 2017 Issue Number : 2 Articles : 5 Articles
It was reported that the total installed capacity of photovoltaic power in China\nhas reached 43.5 GW [1] at the end of 2015. With the vast territory and abundant\nsolar energy resources in western part of China, more than 50 percent\nof photovoltaic power stations and wind farms were built there. In recent\nyears, influenced by such factors as rapid growth in installed capacity of PV\npower stations and wind farms, power generation districts far away from\npower consumption load as well as its mismatch in transmission line, the\nphenomenon of abandoning solar and wind power has already restricted severely\nthe normal operation of photovoltaic and wind power generation. It\nhas greatly reduced the enthusiasm of the investors and constructors for investing\nand building power stations. This paper, based on the status in quo of\npower generation market and power supply in China, analyzes multi-aspect\nreasons for the phenomenon of abandoning solar and wind power and discusses\ntheir solutions....
This document addresses an exhaustive standalone Photovoltaic (PV) energy harvesting\nsystem considering two crucial issues: system efficiency and cost effectiveness.\nIt contributes a compact resolution with a combined feature of Dual Mode-\nMultiple Output (DMMO) associated with input ripple reduction technique. Control\nstrategy incorporates with aspect of Maximum Power Point Tracking (MPPT) and\noutput voltage levels regulation. A theoretical analysis is conducted to evaluate the\neffect of ripple current on PV power. Proposed dual mode converter achieves efficiency\nof 98.36% and 97.76% respectively for mode-1 and mode-2 operation. However,\nsimulation is performed applying MATLAB/SIMULINK tools to analyze the\nfeasibility of the recommended system....
In this paper a new market based analytical model is proposed for optimal placement\nof Wind Turbines (WTs) in power systems. In addition to wind turbines, thermal\nunits (THUs) and Pumped Storage Hydro Power Plants (PSHPPs) owners participate\nin power market. Objective function is defined as participants� social welfare\nachieved from power pool and ancillary markets in yearly horizon. Wind turbines\nhave been modeled by probability-generation tree scenarios based on statistical information.\nWe concentrate on investment profits of WTs numbers and its generation\ncapacity beside to PSHPPs and THUs power plants in power systems due to increase\nin high flexible tools for Independent system operator into the planning and operation\nplanning time interval. For effectiveness evaluation of proposed model, simulation\nstudies are applied on 14-Bus IEEE test power system....
In this work, a new device for tidal energy conversion is presented. The main purpose\nof this research is to investigate the energy conversion of tidal energy into electrical\none by building a small scale prototype using a pneumatic system representing\nthe energy conversion device. The tidal energy conversion device consists of a concrete\nin cylindrical shape, a moving base that moves inside the concrete cylindrical\nbody and two single acting pistons connected to a power turbine. The system specifications\nthat mainly affect the amount of energy are the spring stiffness and hose\ndiameter. It was found that there is a possibility to convert the tidal energy into electrical\nenergy using the designed prototype. The maximum amount of electricity generated\nusing the proposed prototype was about 5 Volts....
In the most current methods of probabilistic power system production simulation, the\noutput characteristics of new energy power generation (NEPG) has not been comprehensively\nconsidered. In this paper, the power output characteristics of wind power generation and photovoltaic\npower generation are firstly analyzed based on statistical methods according to their historical\noperating data. Then the characteristic indexes and the filtering principle of the NEPG historical\noutput scenarios are introduced with the confidence level, and the calculation model of NEPG�s\ncredible capacity is proposed. Based on this, taking the minimum production costs or the best\nenergy-saving and emission-reduction effect as the optimization objective, the power system\noperation model with large-scale integration of new energy power generation (NEPG) is established\nconsidering the power balance, the electricity balance and the peak balance. Besides, the constraints of\nthe operating characteristics of different power generation types, the maintenance schedule, the load\nreservation, the emergency reservation, the water abandonment and the transmitting capacity\nbetween different areas are also considered. With the proposed power system operation model,\nthe operation simulations are carried out based on the actual Northwest power grid of China, which\nresolves the new energy power accommodations considering different system operating conditions.\nThe simulation results well verify the validity of the proposed power system operation model in the\naccommodation analysis for the power system which is penetrated with large scale NEPG...
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