Abstract
This manuscript presents the numerical optimization (through a mathematical model and an evolutionary algorithm) of the voltage-doubler boost converter, also called the series-capacitor boost converter. The circuit is driven by two transistors, each of them activated according to a switching signal. In the former operation, switching signals have an algebraic dependence from each other. This article proposes a new method to operate the converter. The proposed process reduces the input current ripple without changing any converter model parameter, only the driving signals. In the proposed operation, switching signals of transistors are independent of each other, providing an extra degree of freedom, but on the other hand, this produces an infinite number of possible combinations of duty cycles (the main parameter of switching signals) to achieve the desired voltage gain. In other words, this leads to a problem with infinite possible solutions. The proposed method utilizes an evolutionary algorithm to determine the switching functions and, at the same time, to minimize the input current ripple of the converter. A comparison made between the former and the proposed operation shows that the proposed process achieves a lower input current ripple while achieving the desired voltage gain.
Highlights
Some renewable energy sources, such as photovoltaic (PV) panels and fuel cells (FC), produce electrical energy with low amplitude and direct-current (DC)type [1,2]
This article proposes a different operation in which duty cycles are independent, and the objective is to further reduce the input current ripple without changing any parameter, which means that a converter designed with the former strategy [17] can get lower input current ripple when operated with the proposed operation, this is achieved only by changing the driving switching signals, in the proposed operation, switching signals of transistors are independent
The provided solution must comply with the desired output voltage; for a given input voltage, this can be expressed as a voltage gain; the output voltage of the converter is the voltage in capacitor C2 expressed in (42) and repeated here for convenience
Summary
Some renewable energy sources, such as photovoltaic (PV) panels and fuel cells (FC), produce electrical energy with low amplitude (for example, 20 V) and direct-current (DC). The system starts with the renewable energy source; it can be represented like a voltage source, but its voltage is not constant It depends on external factors (for example, the weather conditions in the case of a PV panel) and the current drained from the source. The H-bridge inverter generates sinusoidal voltage synchronized to the electrical grid, and it is followed by an LC filter, which can be used to reduce the harmonic distor of 29 weather conditions the case of the a PV and the current drained the source. In amplitude, and the amplitude is variable, the boost type converter increases the voltage and provides a well-regulated output at the DC-link capacitor.
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