High gain converters are very popular nowadays due to large demand in the area of microgrid-based renewable energy resources. The renewable energy resources have low-voltage generation sources that require high voltage gain converters to step up the input DC voltage. Also, multi-output converters are demanded in the present scenario due to a requirement of different AC and DC load demands. The conventional converters used for this purpose have a few limitations such as duty cycle is limited and they have to operate on extreme duty cycle to achieve high gain. To encounter these problems, hybrid multi-output converters are designed and proposed for high gain in less duty cycle. In this chapter, an extendable multiple-output hybrid converter is presented for AC/DC microgrid applications. The proposed converter is derived from single-switch-derived quadratic boost converter topology. In the proposed hybrid converter, both the filter inductors of the converter are magnetically coupled and the main switch of the converter is replaced by an H-bridge inverter circuit. This inverter bridge can be arranged by series or parallel and depending upon the need of output voltage and current, an n-number of bridges can be connected in series or parallel. Thus, the proposed hybrid converter is capable of giving single DC and n-number of AC outputs simultaneously. This type of converter topologies is mostly suited for rural-based microgrid application where requirements are of less maintenance, high power density and less cost. Detailed steady-state analysis and PWM control algorithm for both series and parallel connected topologies have been carried out to demonstrate its advantages. In this chapter, the proposed topology is validated for two simultaneous AC and single DC outputs on a 500 W prototype through simulation and experimental results.

Chapter Contents:

• 11.1 Introduction
• 11.2 State of the art of hybrid multiple-output converters
• 11.3 Proposed generalized hybrid multi-output converters
• 11.3.1 Nonshoot-through interval (DsTs t (1 – Ds)Ts)
• 11.3.2 Shoot-through interval (0 t DsTs)
• 11.4 Steady-state behaviour of hybrid multi-output converters
• 11.4.1 Series-connected inverter bridges expression
• 11.4.2 Parallel-connected inverter bridges expression
• 11.4.3 Voltage stress and current expression
• 11.5 Hybrid PWM control techniques
• 11.6 Design consideration
• 11.7 Simulation and experimental verifications
• 11.7.1 Steady-state results of series topology-based converter
• 11.7.2 Steady-state results of a parallel topology-based converter
• 11.7.3 Analysis and comparison
• 11.8 Conclusion
• References

Inspec keywords: inductors; distributed power generation; invertors

Other keywords: single-switch-derived quadratic boost converter topology; high voltage gain converters; microgrid-based renewable energy resources; extreme duty cycle; H-bridge inverter circuit; input DC voltage; extendable multiple outputs hybrid converter; rural-based microgrid application; hybrid multioutput converters; power 500.0 W; output voltage; AC/DC microgrid; low-voltage generation sources; multiple-output hybrid converter; high gain converters; conventional converters; converter topologies; high power density

Subjects: Distributed power generation; Power electronics, supply and supervisory circuits; DC-AC power convertors (invertors)