Modeling and Controller Design of PV Micro Inverter without Using Electrolytic Capacitors and Input Current Sensors

Lin, Faa Jeng; Chiang, Hsuang Chang; Chang, Jin Kuan

doi:10.3390/en9120993

Cited by 6 publications

(4 citation statements)

References 22 publications

(25 reference statements)

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“…One way to address the mismatch problem in large strings is to employ MPPT at the individual panel level using microinverters. Figure 1 shows the system diagram of the isolated PV microinverter mounted on each PV panel [9][10][11]. The pre-stage DC-DC converter provides isolation and controls the PV panel to extract its maximum power and provides a high-voltage DC bus for the post-stage DC-AC inverter [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Isolated Photovoltaic Microinverter Using Wide-Band Gap Switches for Standalone and Grid-Tied Applications

et al. 2018

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An isolated photovoltaic micro-inverter for standalone and grid-tied applications is designed and implemented to achieve high efficiency. System configuration and design considerations, including the proposed active-clamp forward-flyback resonant converter for the DC-DC stage and a dual-frequency full-bridge inverter for the DC-AC stage, are analyzed and discussed. A prototype microinverter system is built and tested. Experimental results verify the feasibility of the proposed system, which achieves 95% power conversion efficiency at full load.

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Section: Introductionmentioning

confidence: 99%

High-Efficiency Isolated Photovoltaic Microinverter Using Wide-Band Gap Switches for Standalone and Grid-Tied Applications

et al. 2018

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“…Also, failure of the PCS affects the reliability of the whole system. On the other hand, the microinverter configuration shown in Figure 1b, also referred to as the module-integrated converter (MIC), uses individual small PCSs mounted on each PV module, allowing a simple "plug and play" installation and more localized control such as independent maximum power point tracking (MPPT) at the individual PV module scale [15][16][17][18]. Compared to the centralized PCS configuration, this system is expected to be more reliable with higher energy yield, which justifies its minor cost increase.…”

Section: Introductionmentioning

confidence: 99%

A Time-Efficient Approach for Modelling and Simulation of Aggregated Multiple Photovoltaic Microinverters

et al. 2017

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This paper presents a time-efficient modeling and simulation strategy for aggregated microinverters in large-scale photovoltaic systems. As photovoltaic microinverter systems are typically comprised of multiple power electronic converters, a suitable modeling and simulation strategy that can be used for rapid prototyping is required. Dynamic models incorporating switching action may induce significant computational burdens and long simulation durations. This paper introduces a single-matrix-form approach using the average model of a basic microinverter with two power stages consisting of a dc-dc and dc-ac converter. The proposed methodology using a common or intermediate source between two average models of cascaded converters to find the overall average model is introduced and is applicable to many other converter topologies and combinations. It provides better flexibility and simplicity when investigating various power topologies in system-level studies of microinverter and other power electronic systems. A 200 W prototype microinverter is tested to verify the proposed average and dynamic models. Furthermore, MATLAB/Simulink (2010a, Mathworks, Natick, MA, USA) is used to show the improved simulation speed and maintained accuracy of the multiple microinverter configurations when the derived average model is compared to a dynamic switching simulation model.

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“…5, the design criteria of the inductor can then be derived as Eqs. (1) to (4). Moreover, the peak value of each phase input current can also be derived as Eq.…”

Section: Circuit Topology and Operation Principlesmentioning

confidence: 99%

“…However, a DC input power with about 156 or 312 V is required for the conventional single-phase inverter to provide the 110 or 220 V AC output power, respectively. (1)(2)(3)(4) Therefore, a step-up DC converter would be required to boost the 48 V DC power up to at least 156 or 312 V. Compared with the conventional boost converter, the coupled-inductor boost converter could more easily provide a high-voltage step-up ratio. (5)(6)(7)(8)(9)(10) However, the resulting current ripple in the low-voltage side would become higher than that in conventional topology, which would also result in additional power losses.…”

Section: Introductionmentioning

confidence: 99%

High-voltage Step-up Ratio Single-phase Three-wire Inverter Based on Interleaved Boost Converter

Chen¹,

Yu²,

Liu

et al. 2018

Sensors and Materials

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A high-voltage step-up ratio inverter for applications using batteries as the input power source is proposed to supply the emergency power requirement from a battery pack when the grid is down. The proposed inverter is composed of an interleaved coupled-inductor boost converter and a three-leg full-bridge inverter. Four series-connected lead acid batteries are used as the input power source. When 110 and 220 V AC outputs are required by the load sides at the same time, the 48 V DC input from the batteries would be boosted up to 350 V DC for the three-leg inverter to provide AC output power. However, if only 110 V AC is required, the proposed control strategy would reduce the step-up ratio for a lower DC link voltage of 175 V DC to enhance the conversion efficiency. Moreover, to minimize damage to the batteries, the interleaved circuit topology is adopted to reduce the input current ripple. A prototype with 400 W rated output power is finally constructed. The controller is implemented with a low-cost microcontroller, HT66F50. From the experimental results, it is seen that even under unbalanced load conditions, the output AC voltage is well controlled. The total efficiency of the proposed inverter with 110/220 V AC output is 89.8%, and the efficiency of the inverter with only 110 V AC output is 91.1%.

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Modeling and Controller Design of PV Micro Inverter without Using Electrolytic Capacitors and Input Current Sensors

Cited by 6 publications

References 22 publications

High-Efficiency Isolated Photovoltaic Microinverter Using Wide-Band Gap Switches for Standalone and Grid-Tied Applications

High-Efficiency Isolated Photovoltaic Microinverter Using Wide-Band Gap Switches for Standalone and Grid-Tied Applications

A Time-Efficient Approach for Modelling and Simulation of Aggregated Multiple Photovoltaic Microinverters

High-voltage Step-up Ratio Single-phase Three-wire Inverter Based on Interleaved Boost Converter

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