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This paper proposes a novel battery-balancing mechanism. By modular and decentralized design, this balance circuit can be easily expanded for higher-voltage battery strings. Bidirectional flyback converter is applied to transfer the energy from and back to the connected battery module. A capacitor is placed on the common paralleled secondary side to serve as an energy buffer. Average string voltage...
With the rising concern of the current environmental issues, many renewable options of energy source are developing rapidly. We believe in the near future; these energy sources will be made affordable to everyone including the people in the developing countries. Solar technology is one of the renewable sources of energy which have made multiple breakthrough since its first debut in the 1960s. This...
This paper reviews four different AC/DC converter topologies, and implement them to compare with each other. These selected circuits are analyzed with component quantity, current stress, and converter efficiency performances where these four circuits are selected to support the universal input (90∼264 Vrms) and meet 1.3k Watt/400V DC output, 1 Watt/cm3 power density, and 12ms hold-up time. The density...
Since there are many convertors, invertors, bidirection convertors, sensors and meters in the AC&DC smart micro-grid system, how to collect the real-time data from these devices and send the control command to them to carry out the remote optimization control in high-efficiency is the main problem the smart micro-grid communication system need to face and solve. In this paper, a 3-layer communication...
The various schemes of electric vehicle (EV) charging and the related impacts on electrical generation, transmission and distribution systems has been the subject of intense research over the past decade. The major problems have been narrowed down more to the distribution side of the electricity network. With this background, it becomes critical for a place like Singapore with heavy reliance on electricity...
Phase-shift transformers have been widely used for harmonic cancellation in a large-scale three-phase motor drive system. For a shipboard with multiple sources and loads, a shunt-connected phase-shift transformer can serve as harmonic path to conduct certain harmonic contents. This paper shows how the harmonics can be cancelled in a dual drivetrain system of a shipbboard. A laboratory scale of two...
A planar micro-optic solar concentrator is reported as part of a natural daylight collection system for illumination of indoor spaces. A ray-tracing model is used to evaluate the full system efficiency, from lens array to planar waveguide and to optical fiber array. The lens array and waveguide modules are feasible to be fabricated using cost-effective nanoimprinting methods. Suitability of such daylighting...
Access to sustainable and affordable energy is a requirement to eradicate poverty and create a cycle of market growth. However, products and services are often not customized for the low individual purchasing power of the poor today and thus leave attractive market potentials untapped. To leverage this opportunity, corporations need to start considering the poor as customers of the future and develop...
Enhancing transportation efficiency is the preeminent place to start efforts to minimize emissions of carbon dioxide which is a crucial malefactor in global warming. Due to awe-inspiring advantages over vehicles with internal combustion engines, use of electric vehicles (EVs) finds application in a variety of areas. However, energy storage system (ESS) of the EV plays an important role in EV's performance...
Increasing wind power penetration and the size of Wind Power Plants (WPPs) brings challenges to the operation and control of power systems. Most of WPPs are located far from load centers and the short circuit ratio (SCR) at the Point of Connection (POC) is low, which means that fluctuations of the wind power can cause voltage variations. An optimal voltage control scheme for WPPs with STATCOMs is...
Most rural areas in South East Asia and Africa have insufficient accessibility to utility grid, because they are located on islands and/or because they consist of remote villages without access to the main system. In order to address the electrification problems in these areas, microgrids have been considered as an attractive solution to effectively utilize the distributed energy resources to meet...
Regarding the access of a micro-grid with multiple distributed generation (DG) units into the power distribution network, superconducting fault current limiters (SFCLs) may be used to improve the micro-grid's robustness against short-circuit faults. In this paper, the flux-coupling-type SFCL is selected to play the role, and the optimal allocation of the SFCLs for protection of a micro-grid with wind-PV...
This paper presents a study of the factors that determine cable ampacity adjustments and corrections in the electrical distribution network. Ampacity is defined as the maximum current carrying capacity of any cable. This characteristic parameter depends on many of the cable properties, installation conditions and surrounding environment. In long-distance cable-based power transmission (e.g., HVDC)...
Increasing power consumption requires engineers to find better control techniques to increase energy efficiency. Advancements in technology allows us to use more complex control algorithms to pursue this goal. Load frequency control (LFC) is one of the vital points in power system control and a state of art control method must be used to ensure power quality of the grid. In this work, decentralized...
This paper presents the design methodology and performance analysis of a single passenger prototype battery electric vehicle (EV), named Vidyut. The main objective of this paper is to demonstrate the performance of a Lynch motor based propulsion system for a prototype EV. Lynch motor is an axial gap permanent magnet (PM) brushed dc motor which offers the merits of higher torque to weight ratio, higher...
This paper proposes a voltage clamping balance (VCB) with hysteresis charging/discharging approach for series-connected batteries. The proposed method uses switches to regulate the charging/discharging energy without any magnetic components. The balancing mechanism activated after a battery terminal voltage reaches the rated voltage and charging /discharging the battery with hysteresis charging/discharging...
A novel high efficiency PWM ZVS full-bridge dc-dc converter is presented. A half-bridge LLC resonant circuit which operates at a specific resonant frequency assists the PSFB dc-dc converter achieving ZVS of the lagging-leg switches from zero to full load. The output voltage of LLC resonant circuit is applied to the leakage inductance during the freewheeling phases. The primary circulating current...
Passive power filters are necessary for attenuating the switching frequency harmonics introduced by the modulation of power converters. Recently, various topologies of novel passive power filters have been proposed to enhance their respective attenuation ability with relatively small filter components, i.e., filter inductors and capacitors. This paper reviews the state-of-the-art passive power filters...
As time progresses and technology develops in recent years, the demand for networking communication products is on the increase. Almost all nations throughout the world adopt AC power transmission system. To avoid current phase shift or distortion that would indirectly influence energy conversion performance and power quality in the AC-DC conversion process, it's important to insert PFC into power...
This paper presents the performance analysis of filter sensing board for extracting ac ripple information to estimate the battery impedance for the sinusoidal ripple current charging technique. The charging ac ripple content is extracted from the battery voltage and current by filtering the dc component using an op-amp filter circuit while producing a 90° phase angle in order to transform the a-p...
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