Abstract
A common mode voltage (CMV) reduction method is proposed for the active power filter (APF) integrated single-phase quasi-Z-source inverter (qZSI) based photovoltaic (PV) power system. The APF integrated qZSI completely compensates the dc-side double-line-frequency (2ω) ripple through the APF capacitor, while maintaining low qZS inductance and capacitance. The proposed method reduces the CMV amplitude to half of that using the traditional sinusoidal pulse width modulation (SPWM). The switching and conduction power losses are analyzed. Simulation and experimental results demonstrate the proposed method reduces CMV without comprising performance and efficiency of the APF integrated single-phase qZSI.
Highlights
Quasi-Z-source inverter is attracting high interests in the application of Photovoltaic (PV) power systems
The active power filter (APF) integrated single-phase Quasi-Z-source inverter (qZSI) is expected to be a powerful backup for the residential PV power systems
For traditional single-phase inverter, the common mode voltage (CMV) reduction technology can be categorized as modulation methods modification and topology improvement
Summary
Quasi-Z-source inverter (qZSI) is attracting high interests in the application of Photovoltaic (PV) power systems. For traditional single-phase inverter, the CMV reduction technology can be categorized as modulation methods modification and topology improvement The former reconstructs the voltage vectors to reduce the leakage current amplitude which is well-known by alternating the switching combinations under space vector modulation (SVM) [23]–[25], the latter commonly adds extra power devices to decouple the leakage current path [26]. This paper proposes a modified modulation method for the APF integrated single-phase qZSI PV power system, to reduce the CMV amplitude while suppressing the leakage current without extra devices. The organization of the paper is as follows: the APF integrated single-phase qZSI PV system is introduced and the common-mode model is established in Section II; the proposed CMV reduction method is detailed in Section III; Section IV demonstrates simulation results; Section V concludes the work. The Cg represents the stray capacitance between the PV panel and the ground
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