Abstract
In order to achieve high efficiency of photovoltaic grid-connected system, the constant frequency hysteresis control is introduced into the Z-source grid-connected control, and realized by the fuzzy control technology. Because of the particularity of Z-source shoot-through working state, analyses shoot-through boosting characteristic of Z-source inverter and voltage control performance of DC-link, get the control signal of shoot-through vector. Add the shoot-through vector into hysteresis grid-connected control by using the logical analysis. This method has the advantages of fast dynamic response, high tracking accuracy and stability, and to overcome the traditional hysteresis control filter design is difficult. The simulation results prove the correctness of the theoretical analysis.
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