Recent Advances in Electrical & Electronic Engineering - Volume 7, Issue 1, 2014

This paper provides a stochastic technique for the economic assessment of battery storage system which gives assistance to intermittent wind power. The Discrete Time Markov chain battery storage model is firstly introduced to represent the fluctuating battery SOC in the charging and discharging process. Utilizing the limiting theorem for Markov chains, the life time of battery can be predicted by the stationary distributi Read More

As a basic parameter for the tower load-endurance analysis, it is very important to get insight of dynamic characteristics of the conductor tension during galloping. Taking the advantage of the comprehensive test centre built on real overhead transmission line by SGCC (‘State Grid Company of China’ for short), conductor galloping with artificial airfoils had been observed on 500kV 6-bundled transmission line, during which the co Read More

As a kind of novel machine, the brushless doubly fed machine (BDFM) without the electric brush and slip ring has gained more and more attention in its AC speed regulation and variable-speed constant-frequency generation system applications due to its good operation performance. For the speed regulation of the BDFM as the external disturbance existing, a proportional integral minus delay (PIMD) controller combining with Read More

Traditional video coding methods are able to achieve wonderful performance improvements in data compression. However, these methods have high computational complexity and hardware resource consumption, which are not suitable for some applications, such as wireless multi-media sensor network (WMSN) where low complexity video coding (LCVC) methods are modern technologies. In this survey, some typical LCVC Read More

Power balance is important for power systems, specifically for the microgrid with renewable energy. Integrating pumped-storage system (PSS) to microgrid can keep balance of the power and increase the utilization of wind energy. This paper focuses on the development of a control strategy for PSS of the microgrid with wind power. Firstly the simulation model of microgrid composed of wind power system, PSS and variable lo Read More

This paper presents a novel optimization technique for the design of multi-stage switched capacitor (SC) biquad-based circuits, using multi-objective constraint programming. Optimization methods, namely single objective and multi-objective in the design areas of SC circuits that are adopted in optimal capacitance assignment are briefly introduced. A sample design (4th order SC biquad-based circuit) with multiple objectives is gi Read More

In this study, a coordinated droop control strategy of dual-source energy storage system with virtual coordinate transformation is proposed by researching on the operation characteristics of low voltage (LV) wind/photovoltaic hybrid microgrid, which is prepared with battery energy storage system (BESS) and super capacitor energy storage system (SCESS). Using virtual coordinate transformation-based droop control not onl Read More

This paper presents a new harmonic suppression rectifier transformer with filters and a transformer filtering technology to improve power quality of industrial rectifier system. According to the special circuit topology of the new rectifier transformer, the current relationship is deduced between the grid side and valve side windings, along with the valve side and filtering windings, and the implementation conditions of the transfor Read More

In this paper, a compact (17.7 mm x 12 mm) triple band-notched UWB antenna is presented. For inserting desirable notches, three concentric ring resonators have been placed on the back side of antenna in a manner that the first resonance frequency of each resonator coincides with one of the desired notches. Considering that the second resonance frequency of outer ring resonator places in UWB frequency band, an EBG u Read More