Isolated seven‐level inverter for grid‐connected power systems with predictive control method

Abstract

A novel isolated 7‐level (7L) multi‐level inverter (MLI) topology for grid‐connected medium and high voltage power applications is presented in this paper. The topology consists of two isolated transformers with different winding ratio and four switches connected to a single‐phase grid. This topology provides a great advantage over conventional MLIs by reducing passive and active components to allowing a 7L output voltage. Moreover, model predictive control (MPC) method is implemented to 7L‐MLI to generate gate signals of switches and ensure capacitor voltage balancing and grid connection. Performance of proposed topology has been confirmed by in‐depth analysis under simulation and laboratory setup with existing studies. Experimental results of a 1.5 kW 220 Vrms prototype are presented to support the simulation results. The prototype shows that the harmonic results match the limits of the IEC 61000‐3‐2 standard and show a better performance for grid connection and capacitor voltage balancing than conventional ones.

A new generalized predictive current control algorithm with integration of fractional part function based modulation technique: Single phase self‐balanced type multilevel inverter topologies

“…Generally, it is not possible to precisely control the IOC according to the operator's requirements using simply OLO‐based PWM approaches. To regulate the IOC, authors have described the FCS‐PCCAs 3,4 . In Liu et al, 5 a robust MPC architecture based on fuzzy approximation has been reported.…”

“…To regulate the IOC, authors have described the FCS-PCCAs. 3,4 In Liu et al, 5 a robust MPC architecture based on fuzzy approximation has been reported. In Hosseinzadeh et al, 6 generalized recommendations for implementing the FCS-MPC approach to handle different single-phase SCI topologies have been reported.…”

A single switch hybrid quadratic converter for grid‐integrated renewable energy system

“…The power generation using Solar Photovoltaic approach has become very familiar for the grid-connected and off-grid implementations in the energy arcade. [1][2][3] On the other hand, the future transmission is also hopefully moving forward with electric vehicles transportation system. 4 The usage of fuel cells as a source for the electric transportation system becomes popular.…”

“…In the emerging world, the renewable energy is an important factor and it plays a vibrant measure in the generation of energy. The power generation using Solar Photovoltaic approach has become very familiar for the grid‐connected and off‐grid implementations in the energy arcade 1–3 . On the other hand, the future transmission is also hopefully moving forward with electric vehicles transportation system 4 .…”