An Improved Hybrid PSO-TS Algorithm for Solving Nonlinear Equations of SHEPWM in Multilevel Inverters

Abstract

Selective Harmonic Elimination Pulse Width Modulation (SHEWM) can eliminate selected low order harmonics by solving nonlinear transcendental equations to obtain the switching angles in advance and achieve precise harmonics control. However, when solving nonlinear equations, the convergence rate and solution accuracy of the existing intelligent algorithms for multilevel inverter SHEPWM will decrease with the increase of the number of switching angles. In this paper, an improved hybrid PSO-TS algorithm (IPSO-TS) is proposed for switching angle selection in PWM inverter. In the proposed IPSO-TS algorithm, both the PSO algorithm and TS algorithm are improved respectively to enhance their convergence when calculating multiple switching angles. Also, these two improved algorithms are combined to obtain the hybrid algorithm IPSO-TS, in which PSO is used to provide global search capabilities, and TS is used to increases the accuracy of solutions. Simulations are carried out using MATLAB/SIMULINK environment to demonstrate the better convergence of the proposed algorithm compared with the other existing methods. Moreover, the simulation results are further verified by experimental results.

Total Harmonic Distortion Reduction in Multilevel Inverters through the Utilization of the Moth–Flame Optimization Algorithm

“…This intricate approach revolves around the meticulous determination of precise switching angles for the semiconductor devices. These calculated angles serve as the blueprint for the obtention of the voltage generation, explicitly targeting the creation of the fundamental voltage waveform [37,38]. However, it is worth noting that finding the switching angles requires solving nonlinear equations [35].…”

Optimized Synchronous SPWM Modulation Strategy for Traction Inverters Based on Non-Equally Spaced Carriers

“…There are three primary categories of synchronous modulation strategies: optimizationtarget-based modulation, space vector modulation (SVPWM), and carrier-based sinusoidal pulse width modulation (SPWM). Optimization-target-based modulation encompasses selective harmonic elimination PWM (SHEPWM) and current harmonic minimization PWM (CHMPWM) [9][10][11][12]. While these methods effectively suppress harmonics, their reliance on solving transcendental equations makes them computationally intensive and complex to implement.…”

Development of an Enhanced Selective Harmonic Elimination for a Single-Phase Multilevel Inverter with Staircase Modulation

“…Unfortunately, the approach is flawed from the perspective of THD reduction. In [18], a hybrid improved Particle Swarm Optimization (PSO)-Tabu Search (TS) algorithm is proposed to solve the non-linear equations to find the switching angles. In [19], the crystal structure algorithm (CryStA) is applied for implementing the SHE modulation technique in CHB MLI.…”