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Leakage current suppression is one of the most important issues for transformerless photovoltaic systems, where the technical challenge is how to keep the system common-mode voltage constant to reduce the leakage currents. A new single-phase three-level topology for transformerless photovoltaic systems is presented in this paper. Compared with the conventional H-bridge topology, it only needs two...
This paper presents a mathematical model for a novel quantum series resonant inverter. This inverter can operate in six resonant modes. The differential equations derived from its equivalent circuit in all operation modes are generalized. At the same time, using the new control technique, the quantized output level which is inherent in the quantum converter can be completely overcome. Thus the output...
With the increased use of distributed generators (DGs), the composition of power systems has been changed. The ability to maintain a secure supply with high power quality is becoming more challenging. In this paper, wavelet transform is first used to analyzing of grid-connected voltage. Wavelet denoising and the detection of the non-stationary signals are attained. Islanding can be detected through...
This paper makes a mathematical analysis of a novel quantum series resonant inverter. Differential equations derived from all of the operation modes are generalized. Furthermore, through utilizing the method of equivalent resonant tank, we can simplify the generalized differential equations. The simplified model can help us have a thorough understanding of the operation of the inverter and make a...
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