Switched-Battery Boost-Multilevel Inverter with GA Optimized SHEPWM for Standalone Application

Abstract

Abstract--This paper presents a boost-multilevel inverter design with integrated battery energy storage system for standalone application. The inverter consists of modular switched-battery cells and a full-bridge.It is multifunctional and has two modes of operation: the charging mode which charges the battery bank and the inverter mode which supplies AC power to the load. This inverter topology requires significantly less power switches compared to conventional topology such as cascaded H-bridge multilevel inverter, leading to reduced size/cost and improved reliability. To selectively eliminate low-order harmonics and control the desired fundamental component, nonlinear system equations are represented in fitness function through the manipulation of modulation index and the Genetic Algorithm is employed to find the optimum switching angles. A 7-level inverter prototype is implemented and experimental results are provided to verify the feasibility of the proposed inverter design. In recent years, multilevel inverters have been receiving wide attention and becoming hot topologies for renewable energy applications [5], [6]. Multilevel inverters can be classified into three types that are flying- Index Terms--

A Class D Power Amplifier for Multifrequency Eddy Current Testing Based on Multisimultaneous-Frequency Selective Harmonic Elimination Pulsewidth Modulation

“…The real output power P out is defined in (11), in which u out , i out and T are the load voltage, current and integration interval, respectively. As the objective is generating AC magnetic field rather than dissipating DC power in the load, we define an energy conversion factor ζ as (12), in which the output reactive power Q out [17] is defined as (13) where U i and I i are the root-mean-squared values of the output voltage and current harmonics of order i, θ i is the phase angle difference between them, and Ψ is the set containing the orders of transmitting harmonics. η = P out P DC (10)…”

“…An FFT is done to the current and the largest ten root-mean-square (RMS) values and the corresponding frequencies are listed in Table IV. 3) Power and efficiency comparison between two experiments: According to (10), (11), (12) and (13), the power and efficiency metrics of the two experiments are calculated and listed in Table V. In terms of the efficiency η, the first experiment has a lower value of 20.02%, which is due to the fact that the coil has a high quality factor and much of the power is dissipated by the MOSFETs.…”

Low-order harmonics control in staircase waveform useful in high-power application by a novel technique

“…Multilevel voltage source/current source converters have been widely studied and researched for a variety of applications, which include induction machine drives, renewable energy integration in the grid, active rectifiers, pumps, fans, rolling mills, marine propulsion, high‐voltage, direct current (HVDC) transmission, and railway traction . Various research groups mainly focused on its topology, modulation, and control algorithm.…”

“…Multilevel voltage source/current source converters have been widely studied and researched for a variety of applications, which include induction machine drives, renewable energy integration in the grid, active rectifiers, pumps, fans, rolling mills, marine propulsion, high-voltage, direct current (HVDC) transmission, and railway traction. [1][2][3][4][5][6][7] Various research groups mainly focused on its topology, modulation, and control algorithm. The important topologies include neutral point clamped (NPC), cascaded H-bridge (CHB), and flying capacitor (FC) and various hybrid topologies such as active neutral point clamped (ANPC) and H-bridge neutral point clamped (HNPC).…”

Direct storage hybrid (DSH) inverter: A new concept of intelligent hybrid inverter

“…The second system uses a common dc bus to link the solar panel, battery through a bidirectional dc/dc power converter and then adds a dc/ac inverter to interface with the ac grid [12]- [16]. Alternatively, uncommon configurations such as Z-source inverter [17]- [19], multi-port ac link inverter [20], or switched-battery inverter [21], [22] were also proposed. However, it is difficult to achieve a high overall efficiency with these methodologies because there are many conversion paths and/or devices needed which would introduce more losses to the whole system.…”