Abstract : In recent years, multilevel inverters have received increasing attention in applications such as metallurgy and mining, and various topologies and control strategies have been proposed accordingly, among which the cascaded H-bridge topology has received particular attention. Control strategies include the stepped wave method, carrier phase shift method, and voltage space vector method. This paper focuses on several algorithms for generating stepped waves because the stepped wave generation method has low switching frequency and high efficiency. A method for achieving balance among the H-bridge inverters during stepped wave operation is also presented. Finally, simulation and harmonic spectrum diagrams are used to analyze and compare these methods. Keywords : Cascaded H-bridge, multilevel, stepped wave, harmonics 1 Introduction In recent years, multilevel converters have received increasing attention in high-power applications, and various topologies have emerged. Among them, the cascaded H-bridge multilevel topology has the most promising development prospects. Many control strategies have been developed for this topology, such as the stepped wave modulation method, carrier phase shift method, and voltage space vector method. This article focuses on the stepped-wave modulation method. The biggest advantage of this strategy is its simplicity, lowest switching frequency (equal to the fundamental frequency), and low switching loss, which is particularly important for high-power applications. Several stepped-wave control strategies are presented and compared below. Furthermore, a solution is provided to address the issue of inconsistent conduction loads in the stepped-wave control strategy, achieving a balanced conduction power. 2. Cascaded H-Bridge Multilevel Topology Cascaded multilevel converters achieve high-voltage output by directly cascading several low-voltage PWM converter units. [b][align=center]For details, please click: Analysis and Comparison of Several Stepped-Wave Algorithms in Multilevel Converters[/align][/b]