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In this paper, ZVT interleaved bidirectional LDC(IB-LDC) with switching frequency modulation for mild-hybrid electric vehicle is proposed. The IB-LDC is composed of interleaved buck and boost converters employing an auxiliary inductor and auxiliary capacitors to achieve zero-voltage-transition. Operating principle of IB-LDC according to operation mode is introduced and mathematically analyzed. Moreover,...
This paper presents a ZVT(zero-voltage-transition) interleaved synchronous buck converter with passive soft-switching cell to achieve ZVS(zero-voltage-switching) of MOSFET switches. The proposed interleaved buck converter is composed of two synchronous buck converter modules and passive soft-switching cell. The passive soft-switching cell consists of coupled-inductor and DC-link capacitor. All switches...
48 V to 12 V Soft-Switching Interleaved Buck and Boost Converter for mild-hybrid vehicle is proposed. The converter is consist of interleaved buck and boost converter with auxiliary inductor. Resonance between auxiliary capacitors and inductor is used for soft-switching. Therefore, reduction of the passive component size and switching loss can be implemented. Also, optimal design of the auxiliary...
A novel phase shedding control algorithm considering maximum efficiency for 3-phase interleaved boost converter is proposed. The phase shedding control algorithm is performed to control the operating phase of interleaved converter in accordance with wide load range for high efficiency. Conventional interleaved converter has low efficiency under the light-load condition. In this paper, the 3-phase...
This paper presents design method of soft switching interleaved buck and boost converter for vehicle application. The soft switching interleaved buck and boost converter is composed of interleaved boost converter and resonant tank. The converter improve the problem of switching loss by employing the small size resonant tank compared with conventional interleaved buck and boost converter. The conditions...
Voltage limitation control considering battery module balancing for series connection UPS module system is proposed. The UPS modules system is consists of single master module and multi slave modules. The voltage limitation control is performed to balance the battery modules of UPS system. Firstly, the master module checks the SOC of UPS modules to make order according to SOC. And, the master module...
A current sharing method considering battery state of charge(SOC) for multi-module uninterruptable power supply(UPS) system is proposed. Modularized UPS system consists of a single master module and multi slave modules. A master module performs output voltage control and distributes current commands to slave modules. The current commands are generated by using the proposed current sharing algorithm...
In this paper, serial multi-module UPS system control considering battery module balancing is proposed. Because of the organization, the UPS system has some properties. One of them is output voltage is sum of each UPS module output voltage. Thus, each UPS module output voltage respective control can accomplish each battery module balancing according to SOCs of each battery module. As SOC is high or...
This paper presents the predictive control of single-phase UPS system for fast dynamic characteristic. When occurring grid fault, UPS system has to transfer UPS mode and supply power to the load. In PI controller, it has a disadvantage rather low dynamic characteristic, which is caused increasing transient time. To solve this problem, the predictive control is proposed. By adopting predictive control...
A DC-link voltage compensation method for a photovoltaic (PV) generation system with energy storage system(ESS) is presented. When PV power is oscillated, the DC-link voltage is also influenced. And this fluctuation of DC-link critically affects the load voltage when the ESS is operated in stand alone mode. In conventional method, huge capacitor bank is necessary to reduce the fluctuation. In this...
The power factor and total harmonic distortion (THD) are important considerations when designing an output filter. In the case of the photovoltaic (PV) ac-module, the size and weight also have to be taken into consideration. This paper proposes an output filter to reduce size and weight, and provides the optimal design method for a PV ac-module. The proposed output filter consists mainly of a conventional...
In the photovoltaic (PV) AC-module system, the system size and weight are important design factors because AC-modules are installed to each PV panels. Since the most of harmonics occur at multiples of switching frequency, the harmonic elimination at switching frequency can be an effective technique for reducing the total filter size. To decrease output filter size, proposed output filter consists...
In this paper, energy storage system(ESS) operation algorithm for economics considering battery degradation properties is proposed. Hourly electricity charge according to real-time pricing (RTP) and battery properties are analyzed for high profit through ESS operation. Especially, hourly electricity charge of Illinois State is analyzed. Characteristics of battery accounts for a high percentage of...
In this paper, Energy storage system(ESS) operation algorithm for economics considering battery degradation properties is proposed. Hourly electricity charge according to real-time pricing (RTP) and battery properties are analyzed for high profit through ESS operation. Especially, hourly electricity charge of Illinois State is analyzed. Characteristics of battery accounts for a high percentage of...
In this paper, battery balancing algorithm for serial multi-module UPS system is proposed. The battery balancing algorithm is performed by the output power control of each UPS modules for eliminating SOC difference of batteries respectively. So, the coulomb counting method is used to estimate SOC of the batteries. The reference is compensated with SOC difference and according to magnitude order of...
A current sharing method considering battery state of charge(SOC) for single phase uninterruptable power supply(UPS) module is proposed. Each of UPS module system is consists of single master and multi slave modules. A master module performs output voltage control and current sharing algorithm considering the battery SOC of each of the UPS modules. In current sharing algorithm, current commands are...
In this paper, a control method for phase synchronous of each converter in photovoltaic (PV) hybrid module system (HMS) is proposed. A PV-HMS consists of a central inverter operated with a grid-line frequency and modularized converters installed backside of each PV module. In PV-HMS, the modularized converters has to operate with current-source converter using grid-line phase information because the...
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