Abstract
The cascaded multilevel inverter (CMI) is one type of common inverter in industrial applications. This type of inverter can be synthesized either as a symmetric configuration with several identical H-bridge (HB) cells or as an asymmetric configuration with non-identical HB cells. In photovoltaic (PV) applications with the CMI, the PV modules can be used to replace the isolated dc sources; however, this brings inter-module leakage currents. To tackle the issue, the single-source CMI is preferred. Furthermore, in a grid-tied PV system, the main constraint is the capacitive leakage current. This problem can be addressed by providing a common ground, which is shared by PV modules and the ac grid. This paper thus proposes a topology that fulfills the mentioned requirements and thus, CMI is a promising inverter with wide-ranging industrial uses, such as PV applications. The proposed CMI topology also features high boosting capability, fault current limiting, and a transformerless configuration. To demonstrate the capabilities of this CMI, simulations and experimental results are provided.
Highlights
Multilevel inverters (MIs) are attractive devices in many industrial applications
The neutral point clamped converter (NPC) and cascaded multilevel inverter (CMI) are two types of multilevel inverters, which are popular in PV applications [1,2]
The inter-module leakage currents result from differential-mode voltage (DMV) and common mode voltage (CMV) variations
Summary
Multilevel inverters (MIs) are attractive devices in many industrial applications. These devices can reduce the total harmonic distortion (THD), electromagnetic interference (EMI), dv/dt, switching frequency and voltage stress. The main advantage of CTMIs is their ability to provide galvanic isolation between the dc source and the load/grid This is the case when applying HFLMIs in PV applications, where the leakage current issue is addressed. [16], several level-double networks (LDN) are used as the auxiliary blocks to enhance the quality of the output voltage This topology can offer a common ground between the PV module and the grid, which results in the elimination of the leakage current. In light of the above, a single-source asymmetric CMI is proposed in this paper, which provides a common ground for ac and dc sides This topology uses capacitors instead of the isolated dc sources in the HB cells.
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