Single inductor dual buck‐boost inverter based on half‐cycle PWM scheme with active clamping devices

Abstract

This paper presents a single-phase differential-type photovoltaic inverter named single inductor dual buck-boost inverter (SIDBBI) based on improved half-cycle PWM (HPWM). Conventional DBBI (CDBBI) is a good option for photovoltaic application due to step-up/down ability for varying inputs. However, inherent high inductor current and corresponding increments of inductor size and device ratings have made it less attractive than other topologies. This paper proposes an HPWM scheme with active clamping switches to reduce inductor voltage swing, highly induced current and component stresses by eliminating output voltages offsets. Under the proposed modulation, component voltage stresses in CDBBI can be reduced by zero offset, and there arises a chance to integrate half-utilized inductors, main switches and complementary diodes of two modules into one set, which is the proposed SIDBBI topology. 500 W prototypes of the conventional/proposed inverters have been built for verifications and comparison. Detailed analysis and experimental results under the proposed HPWM show that the size of SIDBBI can be reduced by 40.4% than CDBBI, maintaining comparable efficiency over 96% and wide input coverage by stepup/down ability. Comparative results address that SIDBBI is competitive in terms of component counts, stresses and losses, compared with various kinds of buck-boost inverter topologies.

High Buck in Buck and High Boost in Boost Dual-Mode Inverter (Hb2DMI)

“…Accordingly, a step-up DC-DC converter as the pre-front stage for the inverter is essential for the grid-tied applications resulting in the two-stage converters [1]- [3]. The traditional two-stage converters suffer from either unnecessary switching losses [4]- [6] or conduction losses [7]- [9]. However, in [9] a parallel power processing is used, which reduces the switching and conduction losses of a two-stage converter.…”

Dynamic Analysis of the Switched-Inductor Buck-Boost Converter Based on the Memristor

“…Power electronic technology has developed rapidly in recent years. Like other power electronic devices, the DC-DC converter has also penetrated into many fields, including energy science [1], physics [2], industry [3], automation [4][5][6], and so on.…”

Dynamic sliding mode control of single‐stage boost inverter with parametric uncertainties and delay

“…Unfortunately, the stability of conventional PI and PR control frameworks were proposed in [21] could not be completely assured, when system uncertainties exist, and the control gains should be tuned to ensure favourable performances repeatedly. To increase the efficiency of the controller operation, methods such as one-cycle and half-cycle modulation techniques are presented in [22]. Paper [23] presented a numerical method to calculate an appropriate inductor current reference for handling the tracking control of a boost converter with a sinusoidal output voltage.…”