Abstract
A photovoltaic energy conversion system, constructed by high step-up converter with hybrid maximum power point tracking (HMPPT), is presented. A voltage converter with a high voltage conversion ratio is proposed, which is simple in circuit and easy in control. After this, such a converter operating with a suitable initial duty cycle of the pulsewidth-modulated (PWM) control signal, together with the proposed HMPPT algorithm combining the fractional open-circuit voltage method and the incremental conductance method, is applied to the photovoltaic energy conversion system. By doing so, not only the maximum power point tracking speed can be increased, but also the oscillation around the maximum power point can be reduced. Aside from these, the field programmable gate array (FPGA) is used as a control kernal of the overall system, so as to realize the HMPPT and fully digitalized control. Finally, via a PV simulator, some experimental results are provided to verify the effectiveness of the proposed photovoltaic energy conversion system.
Highlights
With energy shortage, the solar cell energy is getting more and more important in the world
In the photovoltaic energy conversion system, the high step-up converter takes an important role in boosting voltage from the low level to the high level as well as in executing the maximum power point tracking
In [3, 15, 16, 25], the high voltage conversion ratios can be achieved, the high-nonlinear voltage conversion ratios make the systems difficult to control; that is, too many poles and zeros lead to high-order controllers required
Summary
The solar cell energy is getting more and more important in the world. The photovoltaic energy conversion system contains the solar array, the power conditioner, the electric box, the transformer, the battery, and so forth. High step-up converters are widely used in various applications. In the photovoltaic energy conversion system, the high step-up converter takes an important role in boosting voltage from the low level to the high level as well as in executing the maximum power point tracking. In [7, 13, 14], the circuits are simple and easy to implement, the corresponding voltage conversion ratios are not so high, thereby limiting their industrial applications to some extent. For analysis convenience, the proposed photovoltaic energy conversion system is without the battery and is constructed only by the solar array and the proposed DC-DC converter with the proposed hybrid maximum power point tracking (HMPPT). Some experimental results will be provided to verify the proposed topology
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