scholarly journals High-Power Closed-Loop SMPC-Based Photovoltaic System Characterization under Varying Ambient Conditions

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5296
Author(s):  
Pallavi Bharadwaj ◽  
Vinod John
Keyword(s):  
High Power ◽  
High Speed ◽  
Closed Loop ◽  
Power Converter ◽  
Current Control ◽  
Photovoltaic System ◽  
Stable Phase ◽  
Ambient Conditions ◽  
Pv Array ◽  
Input Filter

Photovoltaic energy generation potential can be tapped with maximum efficacy by characterizing the source behaviour. Characterization refers to the systematic terminal measurement-based PV modeling which can further facilitate output prediction and fault detection. Most of the existing PV characterization methods fail for high-power PV array due to increased thermal losses in electronic components. Here, we propose a switched-mode power converter-based PV characterization setup which is designed with input filter to limit switching ripple entering into PV array under test, thereby enhancing system life and efficiency. The high resonant frequency input filter ensures its compactness with high-speed characterization capability. To further enhance the system performance, a closed-loop current control of the system is designed for high bandwidth and stable phase margins. Variation of the controller parameters under varying ambient conditions of 200–1000 W/m2 irradiation and 25–70 °C temperature is documented and an adaptive PI controller is proposed. Experimental and simulation results validate the high performance of the closed loop operation of the PV characterization at 1.2 kW range power level in real-time field conditions. Compared to the open loop operation, the closed-loop operation eliminates the waveform ringing by 100% during characterization.

scholarly journals Hybrid Synchronized PWM Schemes for Closed-Loop Current Control of High-Power Motor Drives

2017 ◽  
Vol 64 (9) ◽  
pp. 6920-6929 ◽  
Author(s):  
Haitao Yang ◽  
Yongchang Zhang ◽  
Guofeng Yuan ◽  
Paul D. Walker ◽  
Nong Zhang
Keyword(s):  
High Power ◽  
Closed Loop ◽  
Current Control ◽  
Motor Drives ◽  
Loop Current

DESIGN AND MICROCONTROLLER IMPLEMENTATION OF A THREE PHASE SCR POWER CONVERTER

1996 ◽  
Vol 06 (06) ◽  
pp. 619-633 ◽  
Author(s):  
RICHARD W. WALL ◽  
HERBERT L. HESS
Keyword(s):  
Power Systems ◽  
High Speed ◽  
Power Converter ◽  
Current Control ◽  
Zero Crossing ◽  
Noise Rejection ◽  
Component Design ◽  
Three Phase ◽  
Improved Performance ◽  
Single Processor

A single processor controls a three phase silicon controlled rectifier (SCR) power converter. An inexpensive, dual optoisolator interface to the power line provides noise rejection and an improved measure of the zero crossing. A dynamic digital phase-locked loop (PLL) algorithm implemented in an Intel 87C196KD-20 processor achieves frequency tracking, dynamically changing characteristics for improved performance. Dynamically modifying the PLL characteristics permits independent capture and locked dynamics. A feedforward method provides command tracking for improved response without loss of performance. This three-component design (processor, optoisolator, and SCR gate drivers) represents a minimal implementation with potential for closed loop voltage and current control. High speed input and output resources included on the 87C196KD processor make an efficient single-device implementation possible. The processor is less than 1% utilized allowing for additional functions to be added in the future. This system operates on both 50 Hz and 60 Hz power systems without modification or loss of performance.

scholarly journals Experimental Testing of Prototype Face Gears for Helicopter Transmissions

1994 ◽  
Vol 208 (2) ◽  
pp. 129-136 ◽  
Author(s):  
R F Handschuh ◽  
D G Lewicki ◽  
R B Bossler
Keyword(s):  
High Power ◽  
High Speed ◽  
Closed Loop ◽  
Experimental Testing ◽  
High Load ◽  
Test Facility ◽  
Spiral Bevel Gear ◽  
Face Gear ◽  
Compressive Stresses ◽  
Scale Design

An experimental programme to test the feasibility of using face gears in a high-speed and high-power environment was conducted. Four face gear sets were tested, two sets at a time, in a closed-loop test stand at pinion rotational speeds to 19 100 r/min and to 271 kW (364 b.h.p.). The test gear sets were one-half scale of the helicopter design gear set. Testing the gears at one-eighth power, the test gear set had slightly increased bending and compressive stresses when compared to the full-scale design. The tests were performed in the NASA Lewis spiral bevel gear test facility. All four sets of gears successfully ran at 100 per cent of design torque and speed for 30 million pinion cycles, and two sets successfully ran at 200 per cent of torque for an additional 30 million pinion cycles. The results, although limited, demonstrated the feasibility of using face gears for high-speed, high-load applications.

scholarly journals Hardware-in-the-loop simulation of high-speed maglev transportation five-segment propulsion system based on dSPACE

2018 ◽  
Vol 4 (2) ◽  
pp. 62-72
Author(s):  
Feng Qin ◽  
Ying Lin ◽  
Diqiang Lu
Keyword(s):  
Control System ◽  
Real Time ◽  
High Power ◽  
High Speed ◽  
Power Converter ◽  
Simulation System ◽  
Hardware In The Loop ◽  
Real Time Simulation ◽  
Time Simulation ◽  
Propulsion Control

Aim: For exploring and testing the key technology of high-speed maglev transportation propulsion control system, this paper designs and establishes a hardware-in-the-loop (HIL) real-time simulation system of the high-speed maglev transportation five-segment propulsion system. Materials and methods of the studies: According to the route conditions and propulsion segment division of Shanghai maglev demonstration and operation line, the real-time simulation platform based on dSPACE multiprocessor systems is implemented. The simulation system can achieve the functional simulation of all the high-power related equipment in the 5-segment area, including 8 sets of high-power converter units, 2 sets of medium-power converter units, 2 sets of low-power converter units, five-segment trackside switch stations and long-stator linear synchronous motors. The mathematical models of linear motors and converters are built in MATLAB/Simulink and System Generator, after compiling, they can be downloaded and executed in Field Programmable Logic Array (FPGA). All the interfaces connecting the simulation system to the propulsion control system physical equipment use real physical components as in the field, such as analog I/O, digital I/O, optical signals and Profibus. Results: By using CPU+FPGA hardware configuration, the simulation steps are greatly shortened and the response speed and accuracy of real-time simulation system are improved. The simulation system can simulate multiple operating modes such as multi-segment, multi-vehicle, double-track, double-feeding, step-by-step stator section changeover, and so on. The simulation results show that the maximum speed of the simulation system can reach 500 km/h. Conclusion: This HIL system can provide detailed real-time on-line test and verification of high speed maglev propulsion control system.

Simulation of FPGA controlled Single Stage Boost Inverter for the Applications of Grid Connected Photovoltaic System

SIMULATION ◽  
2017 ◽  
Vol 93 (12) ◽  
pp. 1087-1097 ◽  
Author(s):  
B. Meenakshi Sundaram ◽  
B.V. Manikandan ◽  
M. Kaliamoorthy
Keyword(s):  
High Efficiency ◽  
Tracking Error ◽  
Design Procedure ◽  
Current Control ◽  
Single Stage ◽  
Photovoltaic System ◽  
Pv System ◽  
Control Approach ◽  
Pv Array

Improving the efficiency, reducing the cost and maintaining the power quality of a grid tied with Photovoltaic (PV) system are the important aspects of the present day research. The efficiency of power conversion can be improved by reducing the number of stages. In this paper, a single stage boost inverter topology fed from PV array is used and connected to a single phase grid. Less number of switching components is used in this topology compared to conventional technique and hence, the converter losses are reduced. This can also be very well extended to utility grid system. Further, the proposed topology includes battery backup unit which consists of a DC-DC converter to overcome the variations of Voltage based Maximum Power Point (VMPP) of PV array because of the variations in solar irradiance. The proposed system uses the current control approach which has zero steady state tracking error to control the single stage boost inverter. The proposed system offers many advantages such as low cost, high efficiency, compactness and high quality of output power. Design procedure and simulation results are obtained from MATLAB/SIMULINK and the experimental results are obtained from the model developed in the laboratory. The entire system is controlled by SPATRAN 3A FPGA board.

High-power converter systems for high-speed generators

2005 ◽  
Author(s):  
P. Kollensperger ◽  
C. Meyer ◽  
U. Schwarzer ◽  
S. Schroder ◽  
R.W. De Doncker
Keyword(s):  
High Power ◽  
High Speed ◽  
Power Converter

scholarly journals MVDC Railway Traction Power Systems; State-of-the Art, Opportunities, and Challenges

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4156
Author(s):  
Patrobers Simiyu ◽  
I. E. Davidson
Keyword(s):  
Smart Grid ◽  
Power Systems ◽  
High Power ◽  
High Speed ◽  
Cost Effective ◽  
Power Converter ◽  
Voltage Source ◽  
Rolling Stock ◽  
The Future ◽  
Traction Power

Advances in voltage-source converters (VSCs), as well as their successful application in VSC-HVDC systems, have motivated growing interests and research in medium-voltage direct current (MVDC) traction power systems (TPSs) for high-speed rail (HSR) applications. As an emerging power-converter-based infrastructure, this study reviewed developments that shape two key evolving pieces of equipment—namely, high-power traction substation (TSS) converters, and power electronic transformers (PETs)—for MVDC TPS as well as prospects for smart grid (SG) applications in the future. It can be deduced that cost-effective and robust high-power TSS converters are available from hybrid modular multilevel converters (MMCs) for enhanced performance and fault-tolerance capability. In addition, silicon carbide (SiC) MMC-based PETs with input-series-output-parallel (ISOP) configuration are present for greater weight/size reduction and efficiency for MVDC rolling stock design. Finally, the implementation of a smart MVDC TPS incorporating a sophisticated railway energy management system (REM-S) based on the smart grid principles is feasible in the future, with numerous benefits. However, there are related challenges, like knowledge gaps on these technologies, the high costs involved, and lack of standardization to overcome to realize widespread future commercial deployment.

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

Sign in / Sign up

Export Citation Format

Share Document