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Contactless power transmission system with the advantages of safety and convenience has been applied to daily supplies. However, general contactless power transmission charger cannot control the current cause there is no charge controller in secondary side and the severe limitation between primary and secondary sides of the battery charger cause difficulty to design. This study provides the charge...
In this paper, an impedance-compensated battery charger is presented to increase the effective capacity of the lithium-ion/lithium-polymer battery. The proposed charger adopts a pulsating current source associated with a pulsating voltage detector to dynamically estimate compensated impedance of battery. With this approach, the discharge-time is extended 12% and the overall battery capacitor is increased...
This paper presents a novel single stage power converter for photovoltaic energy conversion application. The presented power converter consists of a boost type resonant circuit from which both DC and AC outputs are generated. The DC output is used to charge batteries and the AC output is applied for lighting purpose. A mixed maximum power point tracking algorithm is realized by using the boost characteristic...
To reduce the impact of large output power fluctuations of a wind turbine generator (WTG) integrated in a power system, a battery energy storage system (BESS) is installed with the WTG. However, if a large battery is installed, the capital cost of the wind turbine system will increase. Hence, the smaller size of battery is preferable to reduce the capital cost and the battery should be utilized effectively...
Nowadays, a wind turbine generator (WTG) is required to provide control capabilities regarding an output power. Under this scenario, this paper presents a frequency control method by coordination control of the WTG and a battery using load estimation by a disturbance observer for isolated island. The load variation is reduced by the WTG using pitch angle control in low frequency domain and the battery...
This paper deals with an isolated wind-hydro hybrid generation system employing a Squirrel Cage Induction Generator (SCIG) driven by hydro turbine and a Permanent Magnet Synchronous Generator (PMSG) driven by a variable speed wind turbine feeding three-phase four-wire local loads. The proposed system utilizes two back to back connected Pulse Width Modulated (PWM) Insulated Gate Bipolar Transistors...
The paper proposes a single-phase full-bridge positive/negative pulse charger with energy regeneration and adjustable power factor. Based on a generalized zero vector technique, a novel charging system which combines a single-phase boost rectifier with a buck converter is presented. The system forms a novel single-stage converter of AC to DC, and such a converter has both energy regeneration and power...
From depletion of energy resources and consideration to natural environment, introduction of renewable energy facilities has been increasing annually. Moreover, introduction of photovoltaics has increased on the demand side. However, due to the fluctuating power from renewable energy sources, frequency and voltage fluctuations of power systems become problematic. At the same time, there has been a...
In this paper, a novel power converter for electric vehicles (EVs) is proposed. The proposed converter has a Z-source inverter which drives an ac motor, and performs as a current-fed Z-source dc-dc converter against reverse power flow. Thus, the proposed circuit does not need a bi-directional buck-boost dc-dc converter. The operation of the proposed converter was simulated by MATLAB SIMULINK and tested...
This paper discusses the importance of a simulation study of the Taiwan Electrical Fuel Cell Power Scooter. This study applies a more detailed modeling which is complex as existing modeling methods, yet not more difficult to solve numerically. In most simulation studies, the influence of non-linearity (for example, saturation, losses, reluctance effects) of the power electronics and electrical machine...
Recently, the deterioration of lead-acid battery for the automobile is one of the problems. Because, the electrical load increases in the recent automobile. In this paper, on-line SOH (State Of Health) estimation is proposed. The equivalent circuit constants vary by deterioration of the battery. The equivalent circuit constant can be estimated by using terminal voltage and current. Therefore, SOH...
This paper proposed a high-efficiency battery charging and discharging system for high-capacity single-body Li-ion battery. This system can work as battery formation system or battery test system. The main system structure includes a single-phase bi-directional PWM rectifier, dc-link, half-bridge converter with current-doubler synchronous rectifier as charging unit and interleaved pull-push converter...
A DSP is adopted to construct a fuzzy controlled lithium-ion battery charging system. By using this intelligent charging system, the data collection, calculation and peripheral circuit control are performed for the battery charging status. According to the lithium-ion battery charging specifications, two hours are required for battery charging. A fuzzy logic controller (FLC) is constructed by using...
A battery charger with MPPT function for low-power PV system applications is presented in this study. For effective miniaturization, the battery charger is designed with high frequency operation. Some current-sensing techniques are studied, and their MPPT implementation is compared. A pulse charging method is also designed to prolong battery lifetime. The operation principles and design considerations...
A new ZVS-ZCS bidirectional DC-DC converter is proposed, which provides high output voltages 80v-180v. With proposed ZVS-ZCS concept, the MATLAB simulation results of the application to a fuel cell and battery application have been obtained and compared with those of ZVS bidirectional and applications in order to show the excellent performance of the proposed concept. In addition to this experimental...
This paper presents a battery powered switched reluctance motor (SRM) drive constructed using two three-phase intelligent power modules (IPMs). It possesses integrated driving and charging capabilities. In driving mode, five legs of the two IPMs are used to form the SRM modified Miller converter, and the front-end DC/DC boost converter is constructed by the remaining leg. Proper current and speed...
Nowadays, commercial lithium-ion (Li-ion) batteries are playing important roles as supplies for mobile phones, laptop computers and other electronics. In order to maximize the performance of Li-ion batteries, advanced charger is required. The main objective of an advanced battery charger includes short recharge times, high charging efficiencies and improved battery cycle life. This paper presents...
This paper presents the arrangement, modeling and control of a hybrid system for a tramway. In order to supply the power consumption of the tramway (due to the auxiliary services and four traction induction motor drives), the hybrid system presents two power sources: 1) a Polymer Electrolyte Membrane (PEM) Fuel Cell (FC) as primary energy source; and 2) a Ni-MH battery as secondary energy source,...
This paper presents a new control method for H-bridge buck-boost converter regulated by single voltage feedback and dual feedforward controls. This converter has two pairs of the switch, one acts as a synchronous buck and another as a synchronous boost operations, and therefore is suited for battery powered applications to provide an output voltage that is below or above the input voltage. In order...
This paper discuses the printed circuit board (PCB) winding of the contactless power transmission system comparing the traditional transformer power transmission system. In this study, the contactless power transmission system is successfully applied to the wireless mouse for stable power supply. To examine the feasibility of the proposed system in this paper, a contactless power transmission system...
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