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Multi-stage biological treatment of petroleum refinery wastewater using different biological conditions (anaerobic–anoxic–aerobic) has many advantages over other biological methods. It can result in maximum treatment for type of complex wastewater. In this study, raw data obtained from two multi-stage biological reactors (MSBR) used for treatment of different loads of petroleum refinery wastewater...
This work proposes a bidirectional high frequency (HF) link inverter using center-tapped high frequency transformer. The main advantage of this topology is the reduced size of the converter. However the utilization of the high frequency transformer results in the occurrence of high voltage spike at its secondary. To solve this problem, we incorporate a regenerative snubber to clamp the spike and subsequently...
This paper presents a digital controller for ac voltage regulation of a bidirectional high-frequency link (BHFL) inverter using deadbeat control. The proposed controller consists of inner current loop, outer voltage loop and a feed-forward controller, which imposes a gain scheduling effect according to the reference signal to compensate the steady-state error of the system. The main property of the...
In this paper, a detail description of a highly efficient and compact high frequency link inverter is given. The focus will be on the deadbeat controller implementation using the dSPACE DS1104 digital signal processing (DSP) board. In addition, other hardware components such as the gate drives, power circuit, control signals generation, signal conditioning and test-load banks is also described. Selected...
This paper presents a spike suppression method for Bidirectional High-Frequency Link (BHFL) inverter using a regenerative snubber. Unlike the RCD snubber, this regenerative snubber dampens the voltage spike by charging its snubber capacitor during switch transition. The energy is then pumped back into the main power circuit. A 1kVA prototype inverter is constructed and the workability of the regenerative...
This work proposes a bidirectional high-frequency link inverter using center-tapped high-frequency transformer. The topology also incorporates a regenerative snubber to clamp the high voltage spikes due to the leakage inductance of the transformer. The closed-loop control method used is deadbeat control, which provides fast response and low harmonic distortion, even under nonlinear loads. A 1 kVA...
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