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This paper presents an optimal negative current control for four-phase interleaved bi-directional converters to achieve soft-switching features. Four-phase buck/boost converters with bi-directional operation and in discontinuous conduction mode (DCM) are designed and implemented. The optimal negative current is determined and controlled to reduce reactive power loss, while achieves ZVS and ZCS turn-on...
This paper presents filter-capacitor current compensation for Division-Summation (D-Σ) digital controlled singlephase bi-directional inverter with LCL filter to reduce grid-current distortion. The single-phase bi-directional inverter allows wide filter-inductance variation and it can operate in grid-connection mode and rectification mode with power factor correction. With the D-Σ digital control,...
This paper presents current distortion improvement for power compensation with a single-phase bi-directional inverter in a dc-distribution system. For achieving high power quality, the bi-directional inverter can shift the phase of inductor current to compensate reactive power when injecting power into utility grid. In the phase-shift region, the inverter needs to change the switching operation which...
For dc-microgrid applications, a power supply system requires a bi-directional inverter to control the power flow between dc bus and ac grid, and to regulate the dc bus to a certain range of voltages. Its microcontroller has to determine operational modes and current commands for the inverter cycle by cycle. For using the memory space of the microcontroller efficiently and increasing current-command...
This paper presents predictive digital controlled three phase bi-directional inverter with wide inductance variation. The bi-directional inverter can fulfill both grid connection and power factor correction. With a predictive digital control, the inverter is allowed to have a wide inductance variation, reducing core loss and size significantly. The proposed predictive digital control laws can be derived...
An isolated bi-directional full-bridge DC-DC converter with high conversion ratio, high output power and soft start-up capability for battery charging/discharging is proposed in this paper. The use of a capacitor and a flyback converter can clamp the voltage spike caused by the current difference between the current-fed inductor and leakage inductance of the isolation transformer, and can reduce the...
This paper presents a bi-directional converter with a buck/forward active clamp, which can be used in 360 V dc-link and 100 V battery of a dc generation PV system. This topology can achieve turn-on and turn-off zero-current-transition (ZCT). In buck operation mode, the converter is operated with synchronous rectification and with an active clamp, which is realized with a forward snubber. With this...
This paper presents design and implementation of a bi-directional inverter, including a high frequency transformer, a push-pull switch configuration at the dc side, a cycloconverter at the ac side, and a dsPIC controller. The dc/ac conversion is achieved with a phase-shifted control strategy. In addition, this topology also can achieve an ac/dc conversion with the PFC function. In this circuit, the...
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