# Improvement of Power Converters Performance by an Efficient Use of Dead Time Compensation Technique
## 1 Introduction
Consequently, the current research is focused more on uncovering alternative means of current polarity detection, and interference filtering devoid of the phase lag problem. One such strategy involves the use of current reference value to offset the influence of clamp and avoid the repeated near-zero crossing of the actual sampled current [17]. This strategy, however, suffers from the drawback of potential error between the actual and reference current as well as its suitability for only closed-loop control of current. Some have devised a strategy of calculating the current polarity angle and place a high significance on the angle between the current vector and rotor flux angle [18]. Similarly, some have employed the method of dead-time and forward voltage drop induced error calculation in off-line or on-line mode, followed by the addition of the error to power devices' driving pulses [19]. In [20], the dead-time effect is aptly compensated but at the expense of inducing forward voltage drop. Contrarily in [21], the forward voltage drop is addressed while ignoring the dead-time. There also exist some models which take both the dead-time and forward voltage drop into consideration and both the factors are separately analyzed suggesting the possibility of compensating both the effects and found them independent of each other [22]. The error time and error voltage are mutually convertible as per the average value theory. Since inverter legs operate at disparate legs, the error of each can be independently measured to achieve more accurate compensation. This will involve constant estimation of error as the switching frequency changes [23]. There is however the danger of unexpected current clamp in this method when the compensation suddenly changes while current crosses zero. In the second category of dead-time compensation techniques, the current direction is not necessary, and a complex model of the adaptive voltage compensation algorithm is implemented to suppress the dead-time effect [24]. A fast and a slow response disturbance observer are employed which makes a distinction between the back EMF and disturbance voltage, leading to voltage error correction [25]. However accurate motor parameters and complex calculations are major downsides to this approach. The effects of parasitic capacitances of power devices are also important in the context of the compensation method [26]. The dead-time causes an error in the modulation voltage. In [27], the dead-time compensation is utilized for the modulation error and the effects of the dead time have been analyzed on three-level inverters. However, the proposed technique on [27] isn't used to eliminate the consequences of dead time effect on power quality. In this paper, the five parameters of power quality have been improved by a novel DTC technique and the consequences of dead time effect on power quality have been eliminated. A schematic of an industrial microgrid with DTC is given in Figure 1. In this figure, industrial motors make up the majority of the industrial microgrid loads. Introducing DTC in power converters can help in curtailing the non-ideal nature of power electronics. The current research attempts to alleviate the effects of dead time on power converter parameters, for instance, curtailing fundamental voltage, distorting current waveforms, phase angle, and third harmonic as well as torque pulsation. The parametric equations for all the parameters are derived for normal scenarios and dead time compensation scenarios. The model is simulated in MATLAB with two different cases and the results, with and without the proposed model application, are drawn. Figure 1: Conceptual view of an Industrial Microgrid.