New Dead-Time Compensation Method of Power Inverter using Carrier Based Sinusoidal Pulse-Width Modulation

The single phase inverter performance through the unipolar and bipolar strategies has been previously analyzed based on the constant switching frequency pulse width modulation (CSFPWM). However, the confined band variable switching frequency PWM (CB-VSFPWM) is currently proposed as a new variable switching frequency PWM technique through unipolar strategy to facilitate the design of high order filter, to reduce the switching losses, and to reduce the current total harmonics distortion (THD) as well. To evaluate the performance of a single phase inverter based on the CBVSFPWM through bipolar strategy, this paper presents a comparative study of the CB-VSFPWM based inverter performance using the unipolar PWM and the bipolar PWM strategies. The study adopts MATLAB/Simulink to simulate the inverter and to analyze the simulation results in terms of harmonics spectrum, total harmonic distortion (THD), and fundamental components. The analysis of the study results gives an indication about the appropriate type of CB-VSFPWM strategy (unipolar PWM or bipolar PWM) to guarantee the desired performance of the connected inverter in terms of the electrical grid standards like THD, and harmonics spectrum of the inverter current.

Section: Introductionmentioning

confidence: 99%

Bipolar and unipolar schemes for confined band variable switching frequency PWM based inverter

Attia

Seng

Freddy

et al. 2021

“…In [18], for a Tri-level T-type converter with energy storage system, an ESC is developed. To control the circulating currents in parallel interleaved connected power inverters a new dead-time compensation method using carrier based sinusoidal pulse width modulation and modified discontinuous PWM techniques are given in [19,20]. The inverters are connected in parallel for distributed generation application that operates under different load conditions was investigated in [21] and improved droop control strategy for these converters are developed in [22].…”

Section: Introductionmentioning

confidence: 99%

A novel fuzzy based controller to reduce circulating currents in parallel interleaved converter connected to the grid

Gaddameedhi¹,

Srinivas

2021

This paper exhibits suppression strategy of low frequency circulating current components for parallel inter-leaved converters. Here inverters are parallelized by magnetically coupled inductors. Traditionally, carrier interleaved technique was used to get lower distorted output voltage, but it gives a higher circulating currents to flow through the Two-VSC‘s. The mutual inductance of the coupled inductors (CI) is utilized for minimizing circulating currents of high frequency components. Nevertheless, CI can‘t have capability to riddle the components generated by low frequency. When these circulating currents extremely increases may leads to CI saturation, elevated switching losses and diminishes the entire performance of system. Here author identified a novel control technique for a grid-connected parallel inter-leaved converter depending on approach of energy shaping control (ECS). This controller diminishes the value of the low frequency components of circulating current (LFCC). The performance of the proposed circuit is evaluated in simulation mode and correlated with the conventional proportional integral control (PIC) and the linear quadratic control (LQC). The Fuzzy controller is also included in this work to enhance the converter performance effectively and to diminish the circulating currents along with the healthy harmonic performance analysis.

“…Power inverters are used in microgrid [5,6] to transfer electrical energy from direct to alternating current (DC-AC) [7], as shown in Figure 1. This can be modeled as a piecewise linear system with three topologies [8].…”

Section: Introductionmentioning

confidence: 99%

DC-AC power inverter controlled analogically with zero hysteresis

Hoyos¹,

Velasco²,

Candelo-Becerra³

2019

This paper presents the design and experimental validation of a DC-AC power inverter, controlled analogically with zero hysteresis. A control circuit was built using analog electronics components, and optocoupler devices are used to couple the control module with the power stage. The design of DC-AC inverter with electronics circuit and implementation are shown in detail. Experimental results show the effectiveness of control technique and implementation, leading to a robust system concerning load disturbances. The developed inverter offers the possibility of generating regulated output voltages of different signal types, both DC and AC, variable in frequency and in amplitude, useful for feeding a load with various AC signals.