**5. Simulation Results**

A 2 KW three-phase MATLAB based simulation studies of two parallel-connected 3L-NPC and 3L-Vienna rectifier, as shown in Figure 5, has been performed in order to verify the performance of the proposed converter.

**Figure 5.** Diagram of simulated and Implemented system.

The recommended converter is best designed for multi-MW wind generator that is most prevalent in o ffshore wind energy applications. For the purpose of validation three-phase, electric grid as a generated source was considered to implement the proposed converter. All of the parameters that were used by the simulation are mentioned in Table 4.

Figure 6a represents an applied three-phase voltage of 50 Vrms from the grid and Figure 6e,i denote waveforms of voltage across two parallel-connected 3L-NPC and Vienna rectifier, respectively. Figure 6b illustrates the total current drawn from the source, which is exactly the sum of both the NPC and Vienna rectifier. Similarly, half of the total current in Figure 6f,j justify the division of current equally in each parallel connected converter that also satisfies the control main purpose. Figure 6c,g,k show that the phase among applied voltage and current are the same, which means their power factor nearly unity. Figure 6d,h,l are a representation of THD of total current, bidirectional converter current and the Vienna rectifier current, respectively, which also results that the Vienna rectifier has the lowest THD when compared to NPC converter. Therefore, the Vienna rectifier was also selected for the collection of e fficient DC energy from wind energy.

**Figure 6.** Simulation results of a 2-KW proposed hybrid converter.


**Table 4.** Data used for Simulation and Experiment.

The blue and red legends in Figure 7a represent voltage across C1 and C2, while the yellow label represents a total DC-link voltage. The total dc current drawn by the resistive load is shown in Figure 7b.

**Figure 7.** Simulation results of DC link voltage control and load current.
