scholarly journals A Stable DC Power Supply for Photovoltaic Systems

2015 ◽  
Vol 12 (1) ◽  
Keyword(s):  
Power Supply ◽  
Output Voltage ◽  
Electrical Power ◽  
Input Voltage ◽  
Photovoltaic Systems ◽  
Pv System ◽  
Pv Systems ◽  
Dc Power ◽  
Voltage Output ◽  
Dc Power Supply

The use of solar energy as source of power is becoming not a choice but a necessity due to the unprecedented growth in the demand and consumption of electrical power for various applications. The solar power from the Photovoltaic (PV) systems is currently used as a standalone PV system or integrated with the electric grid. However, the generated DC power from PV systems is not stable due to weather, atmospheric and environmental conditions, which requires the design of a DC power supply to produce a stable and regulated DC voltage output. In this paper, a new design of power supply is presented that provides a stable output voltage (Vout = +12 V, 0 V, -12V) over significant range of input voltage variations (Vin = +15 V to +50 V) emulating the variation of output voltage of PV systems. The stabilization of the output voltage reflects the effectiveness of the proposed design for photovoltaic systems applications. The system is simulated using NI-MULTISIM software. A satisfactory simulation result is obtained showing a strong promise to practically implement using discrete components.

Improvement Strategy of Load Regulation of Boosting Power Supply Based on PID Algorithm

2015 ◽  
Vol 740 ◽  
pp. 261-264
Author(s):  
Sheng Zhang ◽  
Pei Zheng Li ◽  
Zhi Wei Chen
Keyword(s):  
Power Supply ◽  
Output Voltage ◽  
Voltage Divider ◽  
Input Voltage ◽  
The Other ◽  
Improvement Strategy ◽  
Pid Algorithm ◽  
Dc Power ◽  
Load Regulation ◽  
Dc Power Supply

As one of the most important parameters of Direct Current (DC) power supply, Load regulation determines the performance of whole system. In this paper, the internal structure as well as performance parameters of LM2577 boosting converter were deeply investigated and based on this investigation we proposed two new methods of improving its Load Regulation. One method (method 1) is to replace the resistor connected to the feedback pin of LM2577 with a programmable potentiometer and sample the variation of output voltage using an AD converter. The potentiometer is adjusted under the control of feedback algorithm to keep the output voltage stable, thus the load regulation enhanced. In the other method (method 2), the feedback pin of LM2577 is connected to an adder to stabilize the output voltage of DC power supply and increase the load regulation. A voltage divider made up of resistors divides the output voltage and provide the divided voltage to one input of the adder. The other adder input comes from DA converter controlled by microcontroller. To reduce the adjust time and increase the efficiency, PID algorithm is applied in the software part of the system. We use 12-bit AD (ADS1115), 12-bit DA (TLV 5638) and 10-bit programmable potentiometer (AD5293) to test the methods above under the condition of 5V input voltage and 600mA load current. When output is set to 7V, the load regulation is improved from 1.043%, the rate from application circuit in LM2577’s Datasheet, to 0.700% and 0.042% by applying the first and second method, respectively. When output voltage equals 12V, the improvement is from 0.658% to 0.008% and 0.008%. Meanwhile, the method 2 suppresses output voltage ripple to be less than 10mV.

scholarly journals Design and development of SEPIC DC-DC boost converter for photovoltaic application

2019 ◽  
Vol 10 (1) ◽  
pp. 406 ◽  
Author(s):  
Ibrahim Alhamrouni ◽  
M. K. Rahmat ◽  
F. A. Ismail ◽  
Mohamed Salem ◽  
Awang Jusoh ◽  
...  
Keyword(s):  
Power Supply ◽  
Output Voltage ◽  
Input Voltage ◽  
Dc Voltage ◽  
Photovoltaic Application ◽  
Dc Power ◽  
Power Switch ◽  
High Voltage Gain ◽  
Wide Range ◽  
New Construction

This study highlights a new construction of SEPIC DC-DC converter. The proposed converter aims for some features such as high voltage gain, continuous input current and reduce stress on the power switch. In addition, the circuit construction ensurs the simplicity in design along with signicant cost saving, since its components are readily available and smaller in size compared to the off-shelf components. This type of converter can adjust the DC voltage to maintain its output voltage to be constant. Typically, SEPIC operated in equipment that uses battery and also in wide range input voltage DC power supply. The converter is designed for renewable energy application where it is able to regulate the output voltage of the Photovoltaic (PV). The converter has been analysed based on different switching frequencies and duty cycle. Thus the outcome of the proposed converter can be achieved by using D=0.45 and fs=30 kHz. The proposed converter is supplied by 26V as an input voltage and produces 300V output and gives 94% of efficiency.

scholarly journals Performance of Active Clamp and Interleaved Active Clamp Fly back DC-DC Converters for PV Systems

2021 ◽  
pp. 66-79
Author(s):  
Noorhan E. Elsobky ◽  
Yasmine Ashraf ◽  
Mostafa A. Hamouda ◽  
Mohamed Sabry ◽  
Sahar S. Kaddah ◽  
...  
Keyword(s):  
Control Systems ◽  
Output Voltage ◽  
Fuzzy Logic Controller ◽  
Input Voltage ◽  
Pv System ◽  
Electric Cars ◽  
Pv Systems ◽  
Switching Power ◽  
Active Clamp ◽  
Converter Topology

The Flyback converter topology is a well-known and widely used for AC-DC and DC-DC power converters that cover a broad-spectrum including switching power supplies, photovoltaic (PV) system, electric cars, and fuel cell-based generation systems, and among other applications. In this work, Active Clamp Flyback (ACF) and Interleaved Active Clamp (IACF) converters are designed and simulated for the use of DC-DC converters of PV system applications. Two control systems are used to control the output voltage of the DC-DC converters for various PV conditions, which are PID (proportional integral derivatives) and FLC (fuzzy logic controller). MATLAB/SIMULINK is used to model and simulate the proposed system, where the proposed control systems are developed to regulate the output voltage for the load requirements. The simulation results of the proposed PV systems indicate that the output voltage stabilizes effectively to the required voltage (24 V) for various loads/applications while the input voltage (output from the solar panel) to the converters is varying regrading to different sun radiation levels and other parameters. The efficiency of ACF and IACF converters are found to be 88% and 90%, respectively.

scholarly journals Implementation of modular MPPT algorithm for energy harvesting embedded and IoT applications

2021 ◽  
Vol 11 (5) ◽  
pp. 3660
Author(s):  
Krishnaveni Kommuri ◽  
Venkata Ratnam Kolluru
Keyword(s):  
Duty Cycle ◽  
Output Voltage ◽  
Smart Cities ◽  
Input Voltage ◽  
Oxide Semiconductor ◽  
Switching Frequency ◽  
Pv System ◽  
Point Tracking ◽  
Dc Power ◽  
Self Powered

The establishment of the latest IoT systems available today such as smart cities, smart buildings, and smart homes and wireless sensor networks (WSNs) are let the main design restriction on the inadequate supply of battery power. Hence proposing a solar-based photovoltaic (PV) system which is designed DC-DC buck-boost converter with an improved modular maximum power point tracking (MPPT) algorithm. The output voltage depends on the inductor, capacitor values, metal oxide semiconductor field effect transistor (MOSFET) switching frequency, and duty cycle. This paper focuses on the design and simulation of min ripple current/voltage and improved efficiency at PV array output, to store DC power. The stored DC power will be used for smart IoT systems. From the simulation results, the current ripples are observed to be minimized from 0.062 A to 0.02 A maintaining the duty cycle at 61.09 for switching frequencies ranges from 300 kHz to 10 MHz at the input voltage 48 V and the output voltage in buck mode 24 V, boost mode 100 V by maintaining constant 99.7 efficiencies. The improvised approach is compared to various existed techniques. It is noticed that the results are more useful for the self-powered Embedded & Internet of Things systems.

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