Abstract
A novel parallel dual-frequency single-phase grid-connected inverter (PDF inverter) is proposed to improve the quality of the output current and reduce the loss of the grid-connected inverter. In the PDF inverter, there are two units which operate at different switching frequencies. The low-frequency unit has a low switching frequency (2kHz), which transfers electrical energy to the grid. The high-frequency unit operate at a high switching frequency (40 kHz), and its current is reversed to the harmonic current of the low-frequency power unit. The principle and control strategy of the novel grid-connected inverter is presented. And the comparison of power loss of two inverters shows that the novel grid-connected inverter has higher efficiency than the LCL-type grid-connected inverter. These capabilities have been demonstrated by mathematical derivation and experiment. For the experiments, a 1500-W prototype has been built in the laboratory. Results obtained confirm the practicality and performance of the proposed inverter.
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