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This paper presents a three-phase transformerless uninterruptible power supply (UPS) with sinusoidal pulse width modulation (SPWM) based division-summation (D-Σ) digital control. A transformerless UPS controls the power flow between dc link and utility grid, as well as tracks the ac reference voltage. The proposed control law derived with D-Σ digital approach takes into account the effects of dc-link...
This paper presents design and implementation of a 20 kVA division-summation (D-Σ) digital controlled three-phase four-wire multi-function inverter system. The inverter can be operated in grid-connected or stand-alone mode to act as a renewable-energy ac power-supply system. In the stand-alone mode, since the D-Σ digital control law includes load impedance estimation, the inverter can track sinusoidal...
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 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...
Boost converters operated in critical mode can achieve high efficiency, while they have some limitations, such as high current ripple, high component rating and low power application. Thus, this paper proposes integrated circuits (IC) of a powerfactor corrector (PFC) controller for interleaved critical-mode boost converters. The proposed PFC control IC can achieve the features of interleaving function,...
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