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High reliability performance of microinverters in Photovoltaic (PV) systems is a merit to match lifetime with PV panels, and to reduce the required maintenance efforts and costs. This paper applies a reliability oriented design method for a grid-connected PV microinverter to achieve specific lifetime requirement. Reliability allocation is performed from the system-level requirement to the component-level...
In this paper, a positioning method of distributed power system is proposed to minimize average voltage variation of DC microgrid through voltage sensitivity. Power flow analysis is performed to derive voltage sensitivity, and droop bus is introduced to improve the accuracy of voltage sensitivity. In addition, the averaged voltage sensitivity according to the position of the distributed power system...
In this paper, Li-ion battery charging method of On-Board Charger(OBC) for Electric Vehicle(EV) considering temperature is proposed. Considering the characteristics of the Li-ion battery that varies with temperature, it is a method for charging while maintaining the proper temperature. It operates in three modes and maintains the proper temperature of the battery via self-charge·discharge. In this...
Rotor time constant is a key parameter in an induction motor drive with indirect field oriented control. In this paper, a modified Model Reference Adaptive Controller (MRAC) utilizing d-axis stator voltage is proposed for online updating of rotor time constant. Compared with the traditional d-axis voltage model, the information of torque current and stator frequency is incorporated into the adaptive...
In the previous studies, it has been shown that the steady-state operation of a class-E resonant inverter can be rapidly simulated in the frequency domain by extending the concept and mathematical form of electrical impedance. This paper provides a more comprehensive solution for the efficient simulation of practical class-E resonant inverter, which is driven by a MOSFET switch. The parasitic components,...
Interior permanent magnet synchronous motors often work under flux weakening state in electrical vehicles for higher speed but faults, such as overcurrent and overvoltage, might occur during that process, after which the power transistors are closed immediately and the battery packs are charged through three-phase uncontrolled rectifier composed of six fly-wheel diodes. It is called uncontrolled generation...
Inverters in voltage control mode including droop control and virtual synchronous generator (VSG) are promising for interconnecting the renewable energy to the grid, which are both emulating the frequency and voltage regulating functions of synchronous generators through droop method. However, improper transient impact current and reactive power output are observed for inverters in voltage control...
The role of electrical wheelchair has been more important in recent aging society. However, currently used electrical wheelchair is not always better solution considering human safety. For example, when the electrical wheelchair contacts a large step, it is dangerous to roll over the step with an ordinary speed. In addition, a human will be exposed to risk when a controller fails during step over...
In this paper, the feasibility of the simultaneous induction heating of the impeller and the vessel of the mixer. For basic investigation, the experiments of the double plates configuration is investigated. New equivalent coil measurement method is also shown. By using this method, the equivalent circuit of the induction heating system can be also easily estimated. The experimental results show the...
In this paper, an 1.2 kW thermoelectric generation system (TEG) for industrial waste heat energy recovery is developed and implemented. To achieve better performance, a novel hybrid maximum power point tracking (MPPT) method is also proposed. Comparing with conventional perturb and observe (P&O) technique and variable-step P&O method, the presented MPPT method can improve the tracking speed...
This paper aims to comprehensively investigate the efficiency, power density and overall cost of input series output parallel (ISOP) medium voltage (MV) all silicon carbide (SiC) DC-DC converter in solid state transformers (SST). The medium voltage capability can be achieved by using either high voltage devices or multiple low voltage cells in series. Voltage rating of semiconductor devices, magnetic...
This paper proposes a design method of the wireless power transfer system which obtains high power and high efficiency by using LC filter circuit in the transmitting side. This study forcuses on the maximum efficiency point of impedance. In the simulation, the proposed design achieved 2.5kW output power with the efficiency of 73%. In the experiment, the proposed circuit achieved 1.8kW wireless power...
The maximum efficiency point tracking (MEPT) control strategy has been adopted in state-of-the-art wireless power transfer (WPT) systems to meet power demand with the highest efficiency against coupling and load variations. Most of the MEPT implementations use dc/dc converters to regulate the output voltage and maximize the efficiency at the expense of increased system complexity. Other implementations...
A novel algorithm for maximum power point tracking (MPPT) in solar power-generating systems was proposed and compared with the conventional methods of hill climbing, perturbation and observation, and incremental conductance. The three conventional algorithms are prone to divergence under low irradiance levels (<150W/m2), resulting in MPPT difficulties. This study proposed a new MPPT technique based...
This paper proposes the novel isolated capacitive power transfer outlet socket and plug using comb type capacitor. The detachable comb capacitor is proposed as a power supply connector. The target power at the first stage is decided as 100W. At first, optimization of structure and material of capacitive connectors is investigated in order to realize easy attachment and detachment. After consideration,...
Plasma cleaning has been broadly applied to remove impurities and contaminants from flexible substrates. The equivalent resistance of a plasma load is a very important factor for power measurement. However, the conventional Lissajous figure method requires an external capacitor serially connected to the plasma load, which conducts the DC bias and leads to large measurement deviation. Moreover, conventional...
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