###### Abstract
Researchers have already carried out several studies on MLI topologies for renewable energy applications: a CHB MLI with a three-phase triple voltage source inverter [32], a single-phase five-level T-type topology in a renewable energy system [33], a direct-driven PMSG-based WECS based on different average value modeling techniques [34], a buck-boost/Cuk converter and a five-level inverter with new selected harmonic elimination pulse width modulation (PWM) [35], a PMSG-based WECS with a back-to-back voltage source converter [36], an NPC MLI and phase disposition sinusoidal PWM [37], and a switched capacitor MLI [38]. In the literature, PV systems have been used as the input sources of PUC MLIs. Consequently, it is seen that the most of the PUC MLI-based studies have been conducted for PV-based systems [27; 28; 29; 30; 31]. It is important to note that there are not many studies on the application of PUC MLIs for wind energy applications. Furthermore, compared to other conventional MLI circuit topologies, PUC MLIs provide a number of benefits, including the use of fewer semiconductor switches and a smaller filter to achieve the same voltage level, the less complicated control method, and the use of circuit parts with smaller ratings and sizes [32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44]. Taking these aspects into consideration, PUC MLI topologies seem to be innovative for PMSG-based wind energy applications. Moreover, the dual-mode PI-PI control technique is adapted from the literature [45]. To the best of the authors' knowledge, this control method is used for the first time for PUC MLI capacitor voltage control. The dual-mode PI-PI control technique is based on the sequential use of two PI controllers. In this approach, the load current measurement has been eliminated and the load voltage reference has been taken into account. In this respect, both simulation and experimental studies are carried out in a stand-alone WECS prototype in this study at two different voltage levels, five and seven. The comparison of the proposed topology with the recently introduced topologies is tabulated in Table 1. It is observed that the proposed system exhibits the lowest THD value among the MLI topologies provided. The novelty and contributions of this work can be highlighted as follows. * According to the extensive literature review, it is observed that the PUC MLI topology is widely utilized in PV system applications. In this respect, this topology is used for wind energy conversion systems, and the performance of the system is verified through both simulation and experimental studies. * The dual-mode PI-PI control technique is adopted from the reference [45] and applied to the voltage control of the auxiliary capacitor in the PUC MLI topology. To the best of authors' knowledge, this control method is being used for the first time for PUC MLI capacitor voltage control. The remainder of this paper is organized as follows. In Section 2, the components of the PMSG-based WECS are examined and analyzed. Section 2.1 focuses on the PMSG, three-phase diode rectifier, and DC-DC boost converter blocks, while Section 2.2 deals with the working principle of the PUC MLI topology, its advantages, etc. Simulation results and experimental results are presented and discussed in Sections 3 and 4, respectively. Finally, the conclusions are drawn in Section 5.