Extended switching algorithms based space vector control for five‐level quasi‐ Z ‐source inverter with coupled inductors

Abstract

This study combines quasi-Z-source into the five-level inverter using coupled inductors. The suggested circuit consists of only one dc voltage source, one quasi-Z-network, six power switches and only one set of coupled inductors. In this topology, the output voltage amplitude is not limited to dc voltage source and it is reliable and higher efficiency because of quasi-Z-network presence. This study also proposes new switching algorithms for the inverter based on pulse width modulation (PWM) and space vector control (SVC) algorithms, which cause boosting capability of output voltage with low total harmonic distortion (THD). This PWM algorithm is particular one, which calculates dwelling time for each switch in every sample time. The proposed SVC algorithm generates a voltage vector with very low harmonic distortion and reduced switching frequency. The performance of proposed inverter and switching algorithm are validated with simulation results using MATLAB/SIMULINK software and experimental results based PCI-1716 data acquisition system. These results demonstrate the proposed inverter with suggested algorithm can generate a wide range of load voltage.

A Modified High Voltage Gain Quasi-Impedance Source Coupled Inductor Multilevel Inverter for Photovoltaic Application

“…Figure 48 illustrates the passive components rating, cost, boosting, and THD comparisons with other similar topologies [31,39,48]. The proposed inverter topology attains fewer passive elements usage, higher voltage gain conversion and better voltage THD than [31,39,48]. Thus, the proposed inverter topology presents its efficiency and suitability for PV standalone and grid-connected systems.…”

“…By comparing the proposed topology with inverter proposed in [36], though the proposed inverter used one extra inductor, the voltage gain is high (3 times). Figure 48 illustrates the passive components rating, cost, boosting, and THD comparisons with other similar topologies [31,39,48]. The proposed inverter topology attains fewer passive elements usage, higher voltage gain conversion and better voltage THD than [31,39,48].…”

“…Additionally, the interleaved converter reduces the size of passive components (inductors and capacitors), and the output voltage harmonic profile is considerably increased [28][29][30][31][32][33][34][35][36][37][38][39]. Banaei et al discussed the switching stress reduction in Z source-based MLI [36].…”

“…Li et al proposed the use of the cascading magnetic cells to obtain a high voltage gain [38] and investigated the voltage gain achievement against smaller duty time. Followed by the authors, Lei et al offered optimized pulse width modulation (PWM) technique with reduction of switching loss, current ripple, low total harmonic distortion (THD) and high boost gain [39]. The space vector PWM is extensively reviewed for impendence sourced VSIs and MLIs [40][41][42][43][44][45][46][47][48][49].…”

A novel coupled inductor Z-source three-level inverter

“…Converters utilizing coupled inductors have many advantages, such as low output current and voltage ripple, fast load transient and low output decoupling capacitance [11]. Recently, many new topologies based on coupled inductors are proposed [12,13,14,15].…”