Abstract
Setting reasonable circuit parameters is an important way to improve the quality of inverters, including waveform quality and power loss. In this paper, a circuit system of line voltage cascaded quasi-Z-source inverter (LVC-qZSI) is built. On this basis, the double frequency voltage ripple ratio and power loss ratio are selected as optimization targets to establish a multi-objective optimization model of LVC-qZSI parameters. To simplify the calculation, an integration optimization strategy of LVC-qZSI parameters based on GRA-FA is proposed. Where, the grey relation analysis (GRA) is used to simplify the multi-objective optimization model. In GRA, the main influence factors are selected as optimization variables by considering the preference coefficient. Then, firefly algorithm (FA) is used to obtain the optimal solution of the multi-objective optimization model. In FA, the weights of objective functions are assigned based on the principle of information entropy. The analysis results are verified by simulation. Research results indicate that the optimization strategy can effectively reduce the double frequency voltage ripple ratio and power loss ratio. Therefore, the strategy proposed in this paper has a superior ability to optimize the parameters of LVC-qZSI, which is of great significance to the initial values setting.
Highlights
Since it was proposed, the quasi-Z-source inverter has effectively overcome the shortcomings of traditional voltage source inverter (VSI) and current source inverter (CSI), and has attracted a lot of attention for many unique advantages
The basic parameters of integration optimization strategy of line voltage cascaded (LVC)-quasi-Z-source inverter (qZSI) parameters based on grey relation analysis (GRA)-firefly algorithm (FA)
We set the values of Z-source network of double frequency voltage ripple ratio and power loss ratio
Summary
The quasi-Z-source inverter (qZSI) has effectively overcome the shortcomings of traditional voltage source inverter (VSI) and current source inverter (CSI), and has attracted a lot of attention for many unique advantages. In [3], a qZSI is presented for the application in parallel operation of battery energy storage systems (BESS) in microgrids. In the islanded mode of microgrid operation, the shoot-through duty cycle of the qZSI is utilized to share the load current between the battery systems, and the inverter modulation index is used to control the inverter AC-side voltage. In the grid-connected mode of microgrid operation, the current of each battery system is independently regulated by adjusting the inverter modulation index and the shoot-through duty cycle. In [4], a parallel PVG-DG-ESS hybrid system integrating a Z-source inverter (ZSI) is proposed. In [5], a control scheme for the photovoltaic (PV)-battery hybrid power conversion system (HPCS) based on qZSI is proposed.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
