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This paper presents a novel zero-voltage-switching approach for predictive boundary conduction mode PFC converter for LED lighting. In the proposed method, instead of being detected by a sensing circuit, the switching off-time for achieving zero-voltage-switching is determined by analytical equations of PFC converter. Therefore, the efficiency reduction caused by sensing circuit can be eliminated...
In this paper, the already proposed high feedback gain switching method has the optimum setting for a specific load step. Therefore, we investigate the optimal setting of the proportional gain switching for various disturbance such as the line and load fluctuation, which could occur in the renewable energy system. As a result, the following setting of the proposed method is optimum: the optimum setting...
This paper presents a control method of class E2 dc-dc converter with adjustable the peak switch voltage under input voltage fluctuation Class E2 dc-dc converter, which is one of the converter suitable for high operating frequency is studied. Class E2 dc-dc converter composed of a Class E amplifier and Class E rectifier. The amplifier side and rectifier side of class E2 dc-dc converter can achieve...
A home solar power system for micro electric vehicles (EVs) is one of the important technologies to realize a sustainable energy society. The aim of this paper is a demonstration of a high performance digital control phase-shifted full-bridge converter connected between solar panels and the dc-bus line. Since the voltage in a home storage battery and EV battery is around 72V in some products, the...
Smart grid systems include many different power sources such as renewable and fossil energy basis. While collecting all type of energy on the grid, phase order, frequency, maximum voltage value and synchronization time of each power station should be known for a smooth operation of the smart grid. Therefore, the detection of peak values of grid voltages will help the smart grid operators to connect...
In this paper, the application of genetic algorithm (GA) to energy management of isolated power system is discussed. A method to realize the simultaneous optimization of configuration and operation with emergency generators (EGs) in a hospital is proposed as an example. The simultaneous optimization of configuration and operation needs search of enormous combinations, which is generally considered...
A model control and a filter suppressing oscillation of the output voltage that can obtain the stable output voltage of a dc-dc converter have been proposed previous. Although there is a problem that the condition on the input side of dc-dc converter is changed when it connects the load equipment to renewable energy generators through the DC bus, since the renewable energy generators are sometimes...
The purpose of this paper is to present an estimation method of an optimum capacity of a storage battery system by combined use of a renewable energy and emergency generators (EGs) installed in a large hospital The hospital is planning to install a photovoltaic power generation system (PV) due to reduce a cost of the power. When the PV is installed, the battery is also to being planned for stable...
This paper presents a comparison of optimum energy scheduling of emergency generators (EGs) of a large hospital with renewable energy system using mathematical programming methods. A large hospital has the EGs to keep a medical service when a power failure occurred in disaster In using the EGs, the hospital has to save the fuel consumption in island operation mode to drive the EGs as long as possible...
The purpose of this paper is to present a design of digital hysteresis current control circuit in ac-dc converter for wind power generation. The control circuit utilizes a digital signal processor and an analog reactor current detector using an RC integrator. In the proposed method, the design of time constant of RC integrator is important to determine the operation range of duty ratio. The design...
Due to the increasing demands of safe and efficient renewable energy systems based on dc-bus, isolated dc-dc converters are widely used in this field as the essential power conversion equipment. At the same time, such converters are expected for wide input voltage range and fault tolerance. This paper proposes an isolated boost full bridge dc-dc converter with a set of low loss active snubber circuits...
With an expansion of using renewable energies, the bus voltage fluctuation should be considered in designing the control circuit of power converters. This paper presents a new fast maximum power point tracking (MPPT) control for solar panels under the bus voltage fluctuation. The proposed method uses a derivative control to the reactor current of the dc-dc converter to improve the transient response...
Due to the increasing demands of safe and efficient renewable energy systems, isolated DC-DC converters became widely used in this field as the essential power conversion blocks. At the same time, such converters are demanded for wide input voltage range and fault tolerance as desirable features. This paper proposes a isolated boost full bridge DC-DC converter which features wide input range and resilient...
This study presents a sensorless static model based with output current estimation method for digital PWM control dc-dc converters. The static model is a feedforward type control method adopted in coordination with the standard PID control and it can improve characteristics of wide input and output range of dc-dc converter by using information of output current. The one of the drawbacks of the static...
This paper presents dc-dc converter based on voltage dividing class E amplifier. Class E2 dc-dc converter, which is one of the converter suitable for high operating frequency is studied. Class E2 dc-dc converter composed of a Class E amplifier and Class E rectifier. the amplifier side and rectifier side of class E2 dc-dc converter can achieve ZVS and ZDS. However, it is indicated that peak switch...
The purpose of this paper is to improve dynamic characteristics of dc-dc converters in the information and telecommunications system by using a proportional and integral gain changeable control method. Generally, stability becomes worse and a limit cycle oscillation occurs when large PID control gains are used. In the proposed method, the proportional gain is risen during a transient state to improve...
Isolated DC-DC converters are widely used as the essential power conversion equipment in recent renewable energy systems. At the same time, such converters are expected for wide input voltage range and fault tolerance. This paper proposes an isolated boost full bridge DC-DC converter with a set of low loss active snubber circuits. To verify the feasibility of the proposed scheme, a 10 kW prototype...
One of the important role for dc-dc converters is to regulate output voltage against the transient variation of input voltage. Recently, renewable energy becomes popular and renewable power generators are connected to the dc power grid directly, dc bus voltage is affected from them. Therefore, the improvement of the transient response against the variation of the dc bus voltage is required to control...
The digital control has the attractive capability, for instance, the high-performance function and the energy management capability. On the other hand, there are issues which must be solved for the actual implementation. The proposed method can solve some of them, namely the transient response, the dynamic characteristics and the precision of the controller, with the simple method.
This paper considers influence of voltage dividing class E amplifier by parasitic capacitances of diode of connected to drive circuit. Voltage dividing class E amplifier can accommodate problem of class E amplifier because it is possible to divide peak switch voltage by connecting transistors in series. In this circuit, the source of transistor can't be connected to ground by connecting transistors...
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