Design and simulation of cascaded H-bridge multilevel inverter with energy storage

Abstract

<p>Stand-alone power system provides a solution for the user in rural areas that are disconnected from the utility grid which requires power electronics device for the power conversion. This work proposes a design of 5-level cascaded H-bridge inverter with energy storage to realize DC-AC power conversion for such system. The DC-DC bidirectional converter is designed to control the charging and discharging of current into/from the battery during the buck and boost mode of operation. At the DC side, dual-loop control strategy using PI controllers is designed to control the current and voltage. The inner loop current controller controls the recharging/discharging of current for the battery, while the outer voltage controller controls the DC link voltage at 200 V for each of the H-bridge unit. At the AC side, multiple feedback loop control strategy regulates the inverter output voltage at 240 Vrms under various load change. The modelling and design of the system is implemented under Matlab Simulink environment. From the results, the battery storage unit works well with the DC link voltage to achieve a balance power transfer within the system between the PV source, load and battery storage under variation of PV power and loading condition.</p>

Power quality assessment of novel multilevel and multistring inverters for electric vehicle applications

“…It infers that the power quality is better with the proposed new multistring inverter possessing minimized THD value of 11.97% and 17.43% for 5-level and 7-level outputs respectively. Table 2 [18] 35.09 32.17 Distribute auxiliary inverter [19] 34.50 31.66 Multilevel DC/AC traction inverter [20] 34.28 30.73 Traction inverter with silicon carbide (SiC) module [21] 31.03 29.96 Inverter system [22] 30.62 28.77 Modified class E inverter [23] 29.80 28.45 Traction inverter [9] 27.63 25.89 250 kW silicon carbide MOSFET based three-level traction inverter [24] 28.91 27.48 Space vector modulation based transistor clamped H-bridge inverter [25] 26…”

Inter-connected AC/DC HMGS power management with 3-phase and 1-phase ILC

“…AC/DC MG is integrated with BESS is referred from [26]. A DC/DC bidirectional converter is designed for BESS with voltage and current controlled [27]. A PID controller is adopted for controlling a buck boost converter [28].…”

“…An optimal power routing scheme is designed for the ILC to reduce the unbalancing of power, losses of active power and the voltage deviations, an AC/DC converter of three phase with four leg is used for optimal power utilization where a IEEE13 bus system is used as unbalanced hybrid micro grid system hybrid micro grid system (HMGS) and IEEE-34 bus as unbalanced distribution network [18]. A fivelevel inverter is designed to ESS with a bidirectional power flow connected to AC/DC MG [19].…”

Simplified control system for grid-tied modular multilevel based energy storage

“…A lot of works focused on working point optimization for alternative power source for example [1], [2]. There are many tools [3]− [5] and instruments [6]− [8] to coordinate alternative source and power grid. To acquire power balance grid-tied energy storage is needed.…”