scholarly journals Compact Single-Stage Micro-Inverter with Advanced Control Schemes for Photovoltaic Systems

Energies ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1234 ◽  
Author(s):  
Yoon-Geol Choi ◽  
Hyeon-Seok Lee ◽  
Bongkoo Kang ◽  
Su-Chang Lee ◽  
Sang-Jin Yoon
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Low Noise ◽  
Single Stage ◽  
Switching Frequency ◽  
Load Range ◽  
Photovoltaic Panel ◽  
Control Schemes ◽  
Interleaved Boost Converter ◽  
Micro Inverter

This paper proposes a grid-connected single-stage micro-inverter with low cost, small size, and high efficiency to drive a 320 W class photovoltaic panel. This micro-inverter has a new and advanced topology that consists of an interleaved boost converter, a full-bridge converter, and a voltage doubler. Variable switching frequency and advanced burst control schemes were devised and implemented. A 320 W prototype micro-inverter was very compact and slim with 60-mm width, 310-mm length, and 30-mm height. In evaluations, the proposed micro-inverter achieved CEC weighted efficiency of 95.55%, MPPT efficiency >95% over the entire load range, and THD 2.65% at the rated power. The proposed micro-inverter is well suited for photovoltaic micro-inverter applications that require low cost, small size, high efficiency, and low noise.

scholarly journals Flyback Photovoltaic Micro-Inverter with a Low Cost and Simple Digital-Analog Control Scheme

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4239
Author(s):  
Salam J. Yaqoob ◽  
Adel Obed ◽  
Rana Zubo ◽  
Yasir I. A. Al-Yasir ◽  
Hussein Fadhel ◽  
...  
Keyword(s):  
Digital Signal Processor ◽  
Low Cost ◽  
Harmonic Distortion ◽  
Single Stage ◽  
System Component ◽  
Maximum Efficiency ◽  
System Efficiency ◽  
Control Scheme ◽  
The Cost ◽  
Micro Inverter

The single-stage flyback Photovoltaic (PV) micro-inverter is considered as a simple and small in size topology but requires expensive digital microcontrollers such as Field-Programmable Gate Array (FPGA) or Digital Signal Processor (DSP) to increase the system efficiency, this would increase the cost of the overall system. To solve this problem, based on a single-stage flyback structure, this paper proposed a low cost and simple analog-digital control scheme. This control scheme is implemented using a low cost ATMega microcontroller built in the Arduino Uno board and some analog operational amplifiers. First, the single-stage flyback topology is analyzed theoretically and then the design consideration is obtained. Second, a 120 W prototype was developed in the laboratory to validate the proposed control. To prove the effectiveness of this control, we compared the cost price, overall system efficiency, and THD values of the proposed results with the results obtained by the literature. So, a low system component, single power stage, cheap control scheme, and decent efficiency are achieved by the proposed system. Finally, the experimental results present that the proposed system has a maximum efficiency of 91%, with good values of the total harmonic distortion (THD) compared to the results of other authors.

Research Status and Prospect of Dish-Stirling System

2014 ◽  
Vol 953-954 ◽  
pp. 83-86 ◽  
Author(s):  
Lin Jun Wang ◽  
Li Xiao Xu ◽  
Jing Men ◽  
Dong Zhang ◽  
Zhang Wei Gao ◽  
...  
Keyword(s):  
Power Generation ◽  
Simple Structure ◽  
High Efficiency ◽  
Low Cost ◽  
Thermal Power ◽  
Low Noise ◽  
Green Energy ◽  
Main Research ◽  
Power Generation System ◽  
Solar Thermal Power Generation

Solar energy is a kind of clean and green energy, its use can reduce the dual pressure of resources and environmental pollution. Firstly, this paper introduces groove, tower and dish type solar thermal power generation system. Then it introduces the components of dish-stirling system and the principle and features of stirling engine. The system has simple structure, reliable operation, high efficiency, low noise, low cost of power generation and good commercial prospects. But for some key parts of system, there are many problems that need to be solved. The main research of dish-stirling system is to optimize the key parts of system and reduce the system costs.

scholarly journals Dual Interleaved LLC Converter for High Power Applications and Wide Load Range

2019 ◽  
Vol 25 (3) ◽  
pp. 4-9
Author(s):  
Michal Frivaldsky ◽  
Jan Morgos ◽  
Andrej Kanovsky
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Negative Impact ◽  
Power Converter ◽  
Switching Frequency ◽  
Resonant Converter ◽  
Load Range ◽  
High Switching Frequency ◽  
Llc Resonant Converter ◽  
Operational Range

Dual interleaved LLC resonant converter with half bridge topology of main circuit characterized by high switching frequency (500 kHz), high power density (60 W/inch3) and high efficiency (above 96 %) over entire operational range (20 %–100 %) is described. Focus was given on the practical design of power converter, which will be able to fulfil requirements on wide load range operation characterized by upcoming normative. Since proposed topology is based on dual interleaved LLC converter, the resonant component´s critical tolerance was also investigated to secure reliable and optimal operational point. Consequently, proposals for elimination of intolerance negative impact are also described. The results of theoretical analysis were verified directly through experimental measurements. Experimental results are finally compared with upcoming industrial standard 80 Plus Titanium.

P-43: LED Backlight Driver Implemented by Single-stage Linear Regulation Control (LRC) Technique for High Efficiency and Low Cost

2012 ◽  
Vol 43 (1) ◽  
pp. 1219-1222
Author(s):  
Po-Hsien Huang ◽  
Shao-Wei Chiu ◽  
Chun-Chieh Kuo ◽  
Yu-Huei Lee ◽  
Ke-Horng Chen ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Single Stage ◽  
Led Backlight

Low cost single stage micro-inverter with MPPT for grid connected applications

Solar Energy ◽  
2013 ◽  
Vol 92 ◽  
pp. 241-255 ◽  
Author(s):  
Dorin Petreuş ◽  
Stefan Daraban ◽  
Ionut Ciocan ◽  
Toma Patarau ◽  
Cristina Morel ◽  
...  
Keyword(s):  
Low Cost ◽  
Single Stage ◽  
Micro Inverter

scholarly journals An Efficient Grid-tied Flyback Micro-inverter with DCM Control Strategy

2021 ◽  
Vol 3 (1) ◽  
pp. 74-84
Author(s):  
Salam Jabr Yaqoob ◽  
Adel A. Obed
Keyword(s):  
Control Strategy ◽  
Pulse Width Modulation ◽  
High Reliability ◽  
Low Cost ◽  
Harmonic Distortion ◽  
Weather Conditions ◽  
Single Stage ◽  
Point Tracking ◽  
Pv Module ◽  
Micro Inverter

In two-stage micro-inverter photovoltaic (PV) applications, DC/DC converter is used to obtain the highest DC power from the PV module. In this type of inverter, the rising of voltage from the PV module to a grid voltage level is limited to a certain value. Moreover, the absence of the isolation between the input and output makes it is less efficient. For these reasons, an efficient single-stage grid-tied flyback PV micro-inverter with discontinuous conduction mode (DCM) control strategy is proposed to feed an alternating current (AC) to the main grid with a lower value of the total harmonic distortion (THD). The control strategy is based on a sine sinusoidal pulse width modulation (SPWM) technique to control the main switch of flyback inverter. Also, a simple perturb and observe (P&O) maximum power point tracking (MPPT) technique has been presented to obtain the MPP point from the PV module for any environmental conditions. The proposed control was verified using PSIM software and simulation results is obtained. The proposed control is tested under different weather conditions for solar irradiance and temperature, as a result, a pure sin wave current has been injected into the grid with a lower harmonics value. Finally, the small size, low cost and high reliability of single stage flyback micro-inverter is presented without the need for DC/DC converter.

scholarly journals Neutral Point Clamped Transformer-Less Multilevel Converter for Grid-Connected Photovoltaic System

Electronics ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 977
Author(s):  
P. Madasamy ◽  
Rajesh Verma ◽  
A. Rameshbabu ◽  
A. Murugesan ◽  
R. Umamageswari ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Current Control ◽  
Neutral Point ◽  
Photovoltaic System ◽  
Special Treatment ◽  
Switching Frequency ◽  
Medium Voltage ◽  
Hysteresis Current Control ◽  
Field Programmable

Transformer-less (TL) inverter topologies have elicited further special treatment in photo-voltaic (PV) power system as they provide high efficiency and low cost. Neutral point clamped (NPC) multilevel-inverter (MLI) topologies-based transformer-less are being immensely used in grid-connected medium-voltage high-power claims. Unfortunately, these topologies such as NPC-MLI, full-bridge inverter with DC bypass (FB-DCBP) suffer from the shoot-through problem on the bridge legs, which affect the reliability of the implementation. Based on the previous above credits, a T type neutral point clamped (TNP)—MLI (TNP-MLI) with transformer-less topology called TL-TNP-MLI is presented to be an alternate which can be suitable in the grid-connected PV power generation systems. The suggested TL-TNP-MLI topologies free from inverter bridge legs shoot-through burden, switching frequency common-mode current (CMC), and leakage current. The control system of the grid interface with hysteresis current control (HCC) strategy is proposed. The effectiveness of the proposed PV connected transformer-less TNP-MLI topology with different grid and PV scenario has been verified through the MATLAB/Simulink simulation model and field-programmable gate area (FPGA)-based experimental results for a 1.5 kW system.

A Single-Stage DC Uninterruptible Power Supply

2015 ◽  
Vol 764-765 ◽  
pp. 466-470
Author(s):  
Maoh Chin Jiang ◽  
Bing Jyun Shih
Keyword(s):  
Power Factor ◽  
Power Supply ◽  
Output Voltage ◽  
High Efficiency ◽  
Low Cost ◽  
Single Stage ◽  
Normal Operation ◽  
Uninterruptible Power Supply ◽  
Sinusoidal Input ◽  
Uninterruptible Power

A single-stage DC uninterruptible power supply (UPS) is proposed in this paper. Basically, the proposed converter is an integration result of a power factor correction circuit with a dc-to-dc converter to achieve simple hardware circuit, high efficiency, and low cost for extra UPS function. Under normal operation, a novel two-switch SEPIC converter operates as an ac to dc converter with sinusoidal input current, unity power factor, and low ripple dc output voltage, and as a battery charger if a battery is added. Since both the input boost supply and the output supply can be controlled independently, a fast transient response can be maintained at both the input for active current wave shaping and at the output for good output regulation. When the ac source is in an outage condition, the proposed converter functions as a dc-to-dc buck-boost converter; therefore, the desired dc output voltage can be provided. Finally, some experimental results are presented for verification.

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