Modelling analysis and power loss of coupled‐inductor single‐stage boost inverter based grid‐connected photovoltaic power system

Abstract

The coupled-inductor single-stage boost inverter (CI-SSBI) has been proposed and applied to photovoltaic (PV) power system. As previously presented, the CI-SSBI has the feature of stepping up input voltage to a higher voltage level by properly designing the turns ratio of coupled inductor and regulating the shoot-through duty cycle. The CI-SSBI based grid-connected PV system integrates some characteristics together in one stage, including boost inversion, feeding current into the grid with high power factor, and maximum power point tracking. Moreover, system reliability can be improved by using the shoot-through zero states as a normal operation mode. This study focuses on the power loss analysis of main elements, and control analysis of both bus voltage loop and inner current loop of the proposed PV system. Simulation and experimental results are presented to verify the analysis and show the real system performance.

Analysis of Power Loss and Improved Simulation Method of a High Frequency Dual-Buck Full-Bridge Inverter

“…The turn-off transition is completed when v GS_S1 goes down to V th and i off_S1 decreases to zero. The turn-off loss P off_S1 can be regarded as two parts: P off1 during t off1 and P off2 during t off2 which can be calculated by Equation (7).…”

Comparative Analysis and Optimization of Power Loss Based on the Isolated Series/Multi Resonant Three-Port Bidirectional DC-DC Converter

“…In order to solve these problems, three-port bidirectional DC-DC converters (TP-BDCs) were developed, which not only simplify the overall complexity of the system, but improve the power density as well. Therefore, their fruitful advantages make TP-BDCs competitive in a wide range of applications [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. According to the connection mode, TP-BDC topologies can be divided into three types: the nonisolated TP-BDC, the partly isolated TP-BDC and the isolated TP-BDC.…”

“…The device has become a research hotspot by virtue of its high efficiency, high reliability, and complete galvanic isolation. Then, with further studies in this field, a sub-classification has been proposed among the numerous published references [15][16][17][18][19][20][21][22][23][24], and two typical structures are proposed, namely the triple-active-bridge structure (TAB), and the resonant three-port bidirectional DC-DC converter, as shown in Figure 2.…”

“…For power converters, especially for the high frequency applications, the loss analysis is crucial due to its guiding significance for the efficiency estimation and magnetic design [24][25][26][27][28][29][30]. Therefore, an increasing number of scholars have focused their attention on the loss analysis for various converters.…”

“…Therefore, an increasing number of scholars have focused their attention on the loss analysis for various converters. In [24], the loss distribution of various components was investigated in detail, and both the power switching devices and the passive components were studied. In [25,26], the switch and diode loss are studied and compared in detail for several converter topologies, and the specific loss distribution of the corresponding topology is also given.…”