Using MPPT in multi-pulse converters for photovoltaic cogeneration

Abstract

One alternative for the processing of energy acquired by photovoltaic panels is the use of phase-controlled inverters associated with multi-pulse autotransformers, which is nothing more than a dual system for multi-pulse rectifiers. This converter has advantages related to robustness, low maintenance, reliability and low cost. Another important feature is that the use of transformers with specific displacement reduces the quantity of harmonic current injected into the grid. This paper will present this converter and proposes the use of Maximum Power Point Tracking (MPPT) acting on the average input voltage of the inverter, using the trigger angle to vary the average voltage of the converter and keep it operating at the maximum power point of the PV panels.

Model, Design and Implementation of LCC Converter for Power Generation and Distributed Generation

“…However, this quality can be easily improved by adding passive LC filters, Figure 12. In [9][10] the authors proposed the use of a LC low-pass filter with a series inductance of = 16…”

“…This makes the LC low-pass filter not enough to reach the required power quality for this topology of converter (final > ≅ 8%). In [9][10] the performance of the LC low-pass filter was better, since they use an 18 pulse converter (easier to filter with a low-pass), instead of the 12 pulse used in this work.…”

“…Only a few papers can be found trying to approach LCC inverters for power generation and all of them are conference papers, [6][7][8][9][10]. In [6][7][8] the authors proposed the use of LCC inverters (6 and 12 pulse converter) for power production using a group of PV panels; however, they lack experimental results, small signal model and stability analysis, as well.…”

“…In [6][7][8] the authors proposed the use of LCC inverters (6 and 12 pulse converter) for power production using a group of PV panels; however, they lack experimental results, small signal model and stability analysis, as well. In [9][10] the authors proposed the use of a multi-pulse converter (18-pulse) for power generation by means of PV arrays. However, nothing is reported about the small signal analysis and the control techniques.…”

“…In this paper the goal is to provide the missing parts; description of the control strategy, small signal model and stability analysis. Besides that, a different filter topology from [9][10] is applied, (LC harmonic filter) resulting in a very good power quality in accordance with the limits established by power quality standards.…”