The SPACE VECTOR MODULATION (SVM) method was recently proposed and captured the interest of scientific research in the following years. In this paper, besides a brief review of the SVM methods proposed in the literature, a new SVM strategy based on the calculation of the minimum (Min) and maximum (Max) of three-phase voltages is proposed. The proposed SVM technique does not have to calculate the sector and angle, as is done in the traditional SVM technique. Therefore, it is the easiest technique to accomplish compared to the traditional SVM method and other existing methods. Compared with the traditional PULSE width MODULATION (PWM), the advantage of using this new SVM strategy is that the scheme is simple and the total HARMONIC DISTORTION (THD) value in the output of the two-level inverter is minimized. The technology has been simulated by MATLAB/Simulink, and then implemented on a real traditional two-level inverter using the dSPACE card. It is worth reporting the reduction obtained for THD using the proposed SVM technique (where THD is about 70%) compared to the traditional PWM technique (where THD is about 79.5%).

In order to improve power quality of electrical distribution networks, a lot of methods are used that their most efficient and effective is the usage of custom power equipment. This equipment has designed based on voltage source inverter and each of its equipment is suitable for compensation of some power quality phenomenon. Distribution Static Synchronous Compensator (D-STATCOM) is one of the custom power equipment that bus reactive power is controlled by current injection and is caused to fix bus voltage in installment location. D-STATCOM performance is simulated based on sinusoidal PULSE width MODULATION (SPWM) and SPACE VECTOR PULSE width MODULATION (SVPWM) using PSCAD/EMTDC software in improvement of voltage sag and swell, and these MODULATIONs are used to produce switching signals of voltage source inverter the equipment. D-STATCOM performance is compared with each other applying these MODULATIONs. D-STATCOM based on SVPWM restores voltages sag and swell effectively. In addition, it produces lower distribution HARMONIC.

Renewable energy sources, such as photovoltaic (PV) and fuel cells, have been given attention during the latest decades due to the limitations of non-renewable sources. Therefore, it is essential to improve the structure of voltage source inverters (VSIs) to increase their voltage gain in these applications. The split-source inverter (SSI) is a single-stage topology that uses the same number of power switches and switching states as VSI with boosting capability and the continuous input current. Three-phase switched-inductor SSI (SI-SSI) consists of two equal inductors, six diodes, one capacitor, and the bridge structure. This topology increases the voltage gain of conventional SSI. On the other hand, the MODULATION scheme impacts the inverters' performance. SPACE VECTOR PULSE width MODULATION (SVPWM) operates more efficiently than the third-HARMONIC injection PULSE width MODULATION (THIPWM) and sinusoidal PULSE width MODULATION (SPWM). However, varying the duty cycle of charging the inductors in each switching cycle increases the low-frequency ripples on the DC side of the inverter. To overcome the mentioned drawback in SVPWM, the modified SVPWM has been proposed. In the modified SVPWM, the interval corresponding to zero states is redistributed to charge both inductors of SI-SSI with similar constant duty cycles. Thus, the low-frequency components on the inductors' current and capacitor voltage are decreased without affecting the active states. The opeRATIOn of three-phase SI-SSI with SPWM, THIPWM, traditional SVPWM, and modified SVPWM is investigated and simulated by MATLAB/Simulink.

In recent years, to increase the number of PULSEs in 12-PULSE autotransformer rectifiers (12-PARs) and reduce the input current total HARMONIC DISTORTION (IC-THD), without increasing the cost and complexity, the technique of PULSE multiplication circuit has been proposed. With this approach in this paper, to upgrade the rectifier structure from 12 PULSEs to 36 PULSEs, an auxiliary PULSE tripling circuit (APTC) with a very small kilovolt ampere rate (a kilovolt ampere equal to 1.34% of the rated load power) is presented. The proposed APTC consists of an unconventional interphase transformer (UIPT) with two diodes in the primary winding and a single-phase diode bridge rectifier connected to the secondary winding. Also, the 12-phase autotransformer used in the proposed structure is based on a polygon connection with a very low kilovolt-ampere rate. As a result, the total kilovolt-ampere rate of the proposed 36-PULSE autotransformer rectifier (36-PAR) is about 24% of the rated load power, which is much less compared to similar structures. Also, according to the simulation results, the IC-THD in the proposed rectifier is less than 3%.

In this paper, a 7-level Diode Clamped Multilevel Inverter (DCMLI) is simulated with three different carrier PWM techniques. Here, Carrier based Sinusoidal PULSE Width MODULATION (SPWM), Third HARMONIC Injected PULSE Width MODULATION (THIPWM) and Modified Carrier-Based SPACE VECTOR PULSE Width MODULATION (SVPWM) are used as MODULATION strategies. These MODULATION strategies include Phase Disposition technique (PD), Phase Opposition Disposition technique (POD), and Alternate Phase Opposition Disposition technique (APOD). In all the MODULATION strategies, triangular carrier and trapezoidal triangular carrier signals are compared with reference signal, then control PULSEs are generated. The detailed analysis of the results has been presented and compared with experimental results in terms of fundamental component of output voltage and percent of THD.

The increase in the number of PULSEs in multiPULSE rectifiers leads to a reduction in HARMONIC current DISTORTION. But this increase in the number of PULSEs leads to an increase in kVA, cost, and complexity of the multi-PULSE rectifiers. As a result, in industrial applications, 12-PULSE rectifiers are mainly used due to their lightweight, simple transformers, and low kVA rate, and low cost. The 12-PULSE rectifiers cannot meet the standard limitations of IEEE Std. 519 means that the HARMONIC DISTORTION of the input current is less than 5%, so they are usually used with the filter. In recent years, in order to increase the number of PULSEs and reduce the HARMONIC DISTORTION of the input current without increasing cost and complexity in the 12-PULSE rectifier, passive HARMONIC mitigation in the DC link has been introduced. In this paper, a PULSE tripling circuit is proposed to upgrade the structure of a 12-PULSE rectifier to 36 PULSEs with a very small kVA rate (kV equivalent to 1.34% of the rated load). Also, the 12-phase autotransformer used in the proposed structure is based on a polygon connection with a very low kVA rate compared to other autotransformer structures. As a result, the total kV rate of the proposed 36-PULSE rectifier is about 24% kV of nominal load. Simulation results show that the HARMONIC DISTORTION of the total input current in the proposed rectifier is less than 3%.