Power Electronics - Science topic
Power electronics is the application of solid-state electronics for the control and conversion of electric power. It also refers to a subject of research in electrical engineering which deals with design, control, computation and integration of nonlinear, time varying energy processing electronic systems with fast dynamics.
Questions related to Power Electronics
Any researcher who is interested in working together in the field of Powers Electronics & Drives, Converter & Inverter Design, MPPT Techniques, Solar Photovoltaic Systems, Microgrid, EV Charging Stations. And also interested in publishing good quality paper. Kindly contact me. And also here Give your suggestion and feedback.
I have designed a Buck converter hardware setup, using MITSUBISHI IGBT MODULES
CM150DU-12H, L=2mH, C=1000uH, Dutycycle=50%, input voltage = 30, in this scenario am getting output voltage same as input voltage, even though by changing the duty cycle???? any solutions for this?
I'm trying to implement 4 step commutation for AC-AC choppers using FPGA board from Xilinx (Spartan 6). The 4 step commutation code works perfectly fine on the FPGA and the output from the FPGA board has been verified on oscilloscope as well. The input to FPGA comes from Dspace microlab box( rti1202).
However, when I try to give the pulses from the FPGA board to the gate drivers (NCD57001) and try to verify the output of the gate drivers for 4 step commutation, one of the states of four step commutation gets missed and instead 0000 state appears.
I expect the output of FPGA to be exactly replicated by the gate drivers but there's a difference in the results. (files attached)
The propagation delay of gate drivers is 90nsec. The DESAT pin of the gate driver has been grounded at the output. Four gate drivers receive pulses from the 4 output pins of FPGA. The input grounds of all the gate drivers are connected to the output ground of FPGA.
Can anyone please suggest some solutions?
Different software for simulation have different benefits. What would be the most popular programs for the simulation of power electronics?
I need to design and simulate a power supply(generator) to drive 6 transducers. power of each transducer is 50 watts and they work at 40khz frequency.
can you please share a design of such generator with me?
I want to learn about analysis and design of resonant converters but where do I start? Do you have any recommendations about books, articles, webinars, videos that cover this topic and you found it usefull?
As an electrical researcher, which journal would you choose as your preferred journal for publishing your research, if possible?
This selection includes a maximum of three journals (in order of preference) and the selection criteria can be based on any of the trends (power system, power electronic, smart grid, etc.).
I have a power supply which is consists of a flyback and a circuit.
It is a dual output power supply that have 3 wires in output(a. ground wire, b. 4kv, c. 8kv).
in put voltage is 220v and the power of this power supply is 50 watts.
I need to simulate this power supply in ltspice or any similar software so I need to know the specs of the flyback transformer.
how can I find the specs of this transformer without destroying it? :D
I want help to evaluation efficiency of DC-DC power converter with Matlab/Simulink. Is there any block for the calculation? Please share any ideas regarding this.
There are two types of ultrasonic transducers: piezoelectric and magnetostrictive.
My question is:
Can the same power supply(generator) used for piezoelectric ultrasonic transducers be used for magnetostrictive ultrasonic transducers without loosing performance?
Is it possible to replace a flyback transformer with a common transformer in a high voltage power supply by modifying the circuit? and if yes, what kind of modifications are needed?
I ask this because making a flyback is harder than making a common transformer.
I want to make a magnetostrictive ultrasonic transducer for homogenizing applications.
I also want to make its power supply by myself.
I need some references (papers, patents, reports, books videos, etc.) that can help me in this way.
I would appreciate your help
--- Is it possible to always get the maximum power that can be fed from a pv panel if i am imposing a stable voltage at a certain value on DC bus (by a certain controller) ?
I am using a TMS320f28377d DSP module for my system (multilevel inverter) which requires generating 24 PWM signals. The good thing in this DSP is that it can generate 24 PWM signals. I am using 8 PWM signals per phase. There is a 120 degree phase shift between the three phases and this by default is done because of the reference signals (Va_ref, Vb_ref, and Vc_ref). I want to make a 180 phase shift between two signals in each phase. For example between PWM#1 and PWM#10.
By referring to the manual I am using the following code:
// Setup Phase
EPwm1Regs.TBPHS.bit.TBPHS = 0. ; // Phase is 0 degree
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm10Regs.TBPHS.bit.TBPHS = PwmPeriod * 0.5 ; // Phase is 180 degree
EPwm10Regs.TBCTL.bit.PHSEN = TB_ENABLE; // Enable phase loading
The 0.5 index indicates the phase shift is 180. However, my signals are not 180 inverted. I hope you share your knowledge if you have some answers to my concern. Thank you in advance.
Take an example, where a battery is to supply two power electronic converters separately. If we switch the contacts of the battery from one converter to the other using two contactors, will it create a significant loss in the converter paths? How much will the efficiency get affected by this method (using contactors)?
What are the other problems that can arise, like the effect in control (due to the resistance or any other component of the contactor)?
Which research area in Power Electronics will make for a good Master thesis in the field of Power Electronics? Would be obliged if someone can inform me about the ongoing scope of such research projects. I am searching for a good research proposal for my Master thesis in the domain of Power Electronics.
Would be obliged, for your help.
Drones are being improved in many different ways according to their applications. Perhaps, what are the Power electronics Improvement that can be done in the system of the drones In the future?
What are the diverse effects of Power factor on the Battery as in state of charge and battery current and voltage and life of the battery
how can i plot the same figure ( desired figure ) for Required leakage inductance with respect to operating power rating and phase shift for DAB converter i tried so many times i think i have problem with my Matlab code , can anyone help me with it ,
I'm sharing my MATLAB code and ( desired figure )
A combined topology of two converters with common elements is to be designed, where switching between the two converters can be done only when required (no importance of frequency of switching here). After switching ON/OFF each of the converters will be controlled differently and they will be completely independent.
So if contactors are used, conduction losses would be higher. Even if semiconductor switches are used then we need a bidirectional and bipolar arrangement of switches, the number of switches will increase and the conduction loss in them will also be present.
So I want to know what can be the other methods for this one-time switching because I want the path to be like the simple conductor with minimum or no additional losses. Or what kind of switching would be best here?
I am madhav kumar, I have competed B.Tech (Electrical & electronics ) from Techno India in 2017 and masters in power electronic specialization from Birla institute of technology mesra Ranchi in 2019.
After my masters degree, I started trying for a government job. But due to Corona there was no vacancy and my age limit also expired. Now I want to go further with research. But I can't understand anything, what should I do?
My masters degree project is "Parameter estimation and implementation of maximum power point tracking algorithm for solar photovoltaic system".
I have also done "V/F control of Three phase Induction Motor" with my partner.
I have published 3 IEEE conference paper.
Please give me a proper suggestion and help which is good for my future??
I) How do I measure common mode voltage in matlab simulation?
II) After knowing the value of the common mode voltage, how do I see the behavior of this voltage together with the stray capacitance generating the leakage current?
III) For example, with this circuit (a), where would I have to measure to get these graphs of common mode voltage and leakage current (b)?
Figures: M. N. H. Khan, M. Forouzesh, Y. P. Siwakoti, L. Li, T. Kerekes and F. Blaabjerg, "Transformerless Inverter Topologies for Single-Phase Photovoltaic Systems: A Comparative Review," in IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. 8, no. 1, pp. 805-835, March 2020, doi: 10.1109/JESTPE.2019.2908672.
I'm working on an induction motor drive with a scalar controller. As inverter modulation, I utilized both SVM and SPWM. I discovered that if the frequency and output fundamental voltage from SVM and SPWM are the same, the THD is about the same. The result can be seen in the image attached herewith. Can anybody explain why the THD is the same? Is THD only determined by the amount of fundamental voltage generated? Any literary references would be much appreciated.
I have a question regarding the zero-sequence voltage injection in three-phase SSTs with bypassed modules in a failure case. I investigated some literature and it is clear that only the fundamental harmonic can shift power between the 3 arms (for power balance).
A 3rd harmonic is often used to reduce the peak arm voltages (-13.4%). However, I investigated asymmetrical fault cases and a 5th and 7th harmonic can help tofurther reduce the arm voltage by a small percentage like 5% (so less redundant modules are needed):
Conference Paper Adaptive Zero-Sequence Voltage Injection for Modular Solid-S...
My question is: Do you know other methods to handle asymmetrical fault conditions in cascaded H-bridges or SSTs? Can I handle grid-imbalances like module faults, since the modules in the phase with an over-voltage have to transmit more power (if no zero-voltage injection takes place)?
I thank you for your suggestions and ideas.
Anyone who has experience with operating a bidirectional DC-power supply as a load. I have an "ITECH6006C-500-40" and plan to operate a set-up with two motors as described in the simple sketch attached. I was primarily wondering if can directly just connect the 3-phase rectifier bridge (https://no.rs-online.com/web/p/bridge-rectifiers/0462130/) between the generator and the DC-supply(sink)? Are there any need to reduce the ripple output of the rectifier? I tried to simulate a simplified model in Simulink where I had the load represented by a resistor or a current source. See attached figure. The input current is alternating, though it does have harmonics.
I am interested to work in the field of power electronics Converter & inverter, Renewable Energy, Solar Photovoltaic System, Battery management, fast charging proces, electrical vehicles, etc
Can u suggest me some topics and area, which one good and easy to publish journal & completed my PHD in within 3yrs..
Respected Prof. Dr. XXXXXXX;
I hope you are doing well and are in good health. My name is Engr. Muhammad Muneeb. I am currently studying in 7th-semester and doing BSc Electrical Power Engineering from The Islamia University of Bahawalpur, Pakistan. I am maintaining a 2nd position in the session with a CGPA of 3.80/4. My 7th semester will be completed at the end of Jan 2021 and my 8th semester by the end of June or mid of July 2021. During my undergraduate, I have worked on semester projects to actualize and implement the theoretical knowledge of Control systems, Power Electronics, Electronic Devices & circuits, High Voltage, AC & DC machines, and also Signal processing and digital signal into practical work. I have worked on mini (semester) projects like Digital Thermometer using Arduino, Obstacle avoiding Robot using Ultrasonic sensor and currently working on Single-phase Smart Grid Tie Inverter as my Final Year Project. I am also doing research and will publish a paper with one of my department teachers; who is doing a Ph.D. in Electrical Power Engineering. I just saw a Post XXXXXX on the Facebook group regarding a research position for the Master's Program in Machine learning and robotics-related field at XXXXXX University. I have also read about your projects and achievements. I am very enthusiastic to conduct research and pursue MS under your supervision. I have attached my Cv and transcript (currently only 5th semester available) with this email and looking forward to hearing from you soon. Also if you need anything else from me please ask me as well. I shall be thankful for your response. Sincerely, Muhammad Muneeb Whatsapp : +923030788740 WeChat: +923357915880 Skype: muneeb.mazhar1
When mosfet is turned off there is a reverse voltage across body diode and the depletion region of drain-source diode(Cds) gets charged. As for the diode, it is forward biased and there is no stored charge across its depletion capacitance(Cj). When we turn on the mos the stored charge in Cds gets dumped into the channel of mosfet and gets wasted and the Cj gets charged. During the turn off transition of mos the Cds gets charged now and the charge stored in Cj gets discharged through the load. Here it is said that the energy lost during turn on transition is 0.5(Cds+Cj)(Vg^2). From my understanding I think that the lost energy is of the energy stored in Cds and Cj discharges its energy back to the load(during the turn off transition of mos). But that doesn't add up with the result given here. Please correct me if I am wrong and explain what is going on.
Thanks in advance
In this circuit the capacitor is junction capacitance of diode and ringing takes place here. The third plot is voltage across diode. As the stored minority charge inductor is stored with negative current and it need a path to flow. My doubt is where does this current actually(physically) flow? I mean the junction capacitance is modelled from the depletion region meaning that it will flow through diode again but diode cant conduct in negative direction. Please explain me what is exactly going on here and tell me where am I going wrong.
Thanks in advance
I am designing the DC-DC converter (Buck) in Cadence. The compensation has been calculated and the simulation in time domain is very okay at different load/line conditions. In order to verify the stability of full design, the analysis of phase margin/gain margin using SpectreRF; particularly using PSS/PCA or PSS/PTSB) has been widely used and recommended.
I have make some effort to simulate but this work has not been succeeded yet.
Anyone have experienced this work? If yes, it would be very nice if you recommend some tutorial or related documents.
Really appreciate your help
My doubt is when we intend to negative voltage from sinusoidal voltage as shown in the picture below, how does T3,T4 conducts when they are reverse biased(in positive half cycle). Graphically, Vout = (-V) makes sense but how would these thyristors even turn on with the gate pulses if they are reverse biased?
Can anyone guide me on which cheap FPGA kit can I used for linear as well as non-linear type controller implementation in Power Electronics Applications?
I am working on the design of an auto-adjustable 25khz 2000W ultrasonic generator(power supply).
I will use that to generate the ultrasonic power of a welding system.
"auto-adjustable" means that it can find the right working frequency of the transducer by getting feedback from piezo stacks.
I am looking for books or websites or papers that can help me in my work.
If you have a circuit design designed for this purpose, I would be grateful if you could share it with me.
[Images are attached at bottom]
I am currently working on a buck converter controlled by two different control methods, Reinforcement learning applied to find PID values & a lead-lag compensator. The controllers are designed and perfectly fit the transfer function system but once applied to the circuit system things go astray.
As can be seen from the image below of the graphs (1) and (2) show to be outliers in comparison to there transfer function counterparts.
I do not know why the disparities are occurring since the transfer function system and circuit system are not far off one another. I can provide the proof of this if wanted. I can supply the Simulink file also if wished. Any help in the right direction is appreciated. I currently think integral windup may be taking place but I am not sure.
Thanks in advance
I am trying to design a PR controller to control the output voltage of a single-phase H bridge inverter having unipolar SPWM (fundamental frequency=50Hz and switching frequency=20kHz).
Can anyone please suggest to me a simple way to find Kp Kr values for the PR controller?
Your answers would be very helpful and I appreciate your help.
Kind regards, Silpa
I am trying to model a DAB converter and I need to observe the power transfeered to the load side on varying the phase shift between two bridges, hence I couldnt take a constant load e.g resistance.
So i am planning to add a energy storage element e.g battery or something to notice in the change in out voltage and then power delivered.
I am working on a standalone DC Microgrid with PV and Battery with a load interfaced to a common DC bus through power electronic interfaces. The interface of battery is a non-isolated bidirectional DC-DC converter, through which the DC bus voltage is being regulated at a reference value(48 V in our case). Now under the case of variable irradiance and variable load, I am experiencing spikes in voltage especially at the instants of load changes. The filter design of the power electronic interfaces has been proper. Can someone help me in solving this problem?
The DC bus voltage variation is attached. The loading pattern is also attached.
I am working on a project in which I need to control the duty cycle of the pulse given to mosfet in an AC to DC converter.The mosfets are connected to LCL filter to give a regualted 5V.The output voltage and a reference of 5V error is taken and a compensator is connected.The output is compared using PWM and then sent to mosfet.Do we need mosfet driver in between?What kind of mosfet driver should I use in multisim?Can I get any reference?Should we solve this using bode plot?Should I use PID controller to decrease the error and should I simulate in MATLAB using PID controller ?As I find it easy
If an inductor of X mH is being incorporated in an LC / LCL filter, what should be the core type assuming that the carrier frequency of sine pwm would be around 4 kHz?
Will it be a ferrite type core or CRGO? Why?
I am preparing a layout for designing a cloud platform (IoT application) for a battery management system. The voltage, current and temperature of the battery would be recorded. The data from the BMS would be sent via hardware such as Raspberry Pi, etc. and Cloud could be any (Google Cloud IoT / Microsoft Azure / Amazon). Since everything is on design phase, What could be the possible challenges to this application? Are the data fetched on time or time delay estimated is to be done??
I am a recent graduate and started my career in the Power Electronics field. It's really great field and I am lucky to get an opportunity to learn PCB design, control of power supply, reliability analysis. My study background more related to power engineering and I want to be an expert in Analog Electronics, Digital Electronics, and Embedded control systems. Can you please anyone guide me for each field (Analog, Digital Electronics, Embedded system) what resources I should use? It would be really great help
As the penetration of grid-connected solar energy increases, is it technically possible to replace most of the conventional power generations including coal, gas and natural gas in modern power grid? Is there any critical technical challenges we need to overcome? There are various researches ongoing such as virtual inertial (VI)-based inverter, maximum power point tracking (MPPT) and hybrid energy storage system (ESS) to address voltage/frequency instability, IV & PV non-lineality and solar energy non-availability during night time respectively.
Plus, there are many technologies like artificial intelligence (AI), smart grid, blockchain and other advanced terminologies available for solar energy. From these perspectives, will the solar energy eventually replaces conventional power generation or it will be limited as a supplementary energy source for existing power system which is ideal for remote and vast area?
Welcome to exchange your valuable perspectives on the future of solar energy.
I have tuned the PI controller for the voltage control loop and inner control loop. But the problem is that it is not stable from a wide variation in the load/bus voltage. On the DC bus, there is a boost converter connected which is used to transfer power from renewable generation.
While Tuning considering rated load (separate/isolated) the operation is good. But on connecting it with DC Bus (microgrid) it is not working properly.
Journals with review time of 3-4 weeks and publication time of <6 months.Impact factor journals >1.
I modeled a PV panel (Voc = 37.7V and Isc = 8.72A) in simulink with Rs and Rsh being dynamic. I tried to use it with a buck converter and a resistive load. The controlled current source cannot work without an input capacitor, I added a capacitor of 50*10^-6. It works fine but with an overshoot of 20A. Also, when I changing the load resistor a little bit , I get output current of 12A. You can see the picture below.
Did anyone face this issue?
I have noticed my battery SOC keep on increasing even before I close the switch between Constant current source and battery ! Any idea why this is happening ? Tried manually deleting the connection between CC source and battery then it's staying at same soc and no battery voltage rising happens.
Attached model and result waveforms screenshot
Unfortunately on the section of Manuscript Subject I could not find the WPT subject.
In case it is not possible to submit a manuscript on IEEE (Transactions on Industrial Electronics) for the mentioned field, could you please suggest me some other IEEE transactions journals which have higher impact factor than ( IEEE Transactions on Power Electronics ) for the field of WPT for EVs. Thank you so much
I have a grid connected 5KW system with 16 panels, with individual panel rating ranging from 36-40 V at 8 A connectedin series give approximately 500-600 V at 8 A. In times of power outage, the Inverter usually supplies power to the load. In absence of a battery unit how do we limit the excess power produced. We thought of using a buck converter to minimize production in such power outage scenarios, but using a buck converter for close to 2KW or 3KW is practically impossible and not cost effective.
I did think of using a voltage reference based power limit control, but the inverter's MPPT is not taking the reference votlage. The inverter in question is a commercial one made by Growatt solutions with an inbuilt MPPT control.
Dealing with LLC resonant converter simulation and would like to plot the efficiency curve. How Can I do that ? eff = Pout/Pin ( Pout I can calculate from Output voltage and current but input current seems to be partial sinusoidal and cannot deal with any calculation !)
Hi, I'm trying to simulate a grid connected Pv inverter model using fuzzy logic controller by generating pulse from Dq0 voltage component. For filter I used LCL filter. I need some help.
1. I'm putting 769V PV input but getting 885V output which is more than input. Output power is 25KW for 50KW input. I'm not using any MPPT method and calculated DC link capacitor for 700V and getting 885V as well on dc link. Is this a problem?
2. When I simulate I'm getting huge reactive power flowing. If I fix this using Three phase reactive load THD of current goes very high up and system efficiency decreases. How can this be solved?
3. D-axis voltage in pu is 0.85 and Q-axis voltage is -0.5 instead of 1 and zero. Need help in this area also.
the dc-dc converters has two transfer functions , control to output and line to output TF. which one is used when design a controller? and which one is used to test step response?
Dear Colleagues, I have single phase inverter connects photovoltaic array of rating 10 kW with the grid at 220 V/50 Hz. I need to design the filter inductor that couples the inverter with the grid. The switching frequency of the inverter is 10 kHz. Can anyone advise me about the best core material and the design procedure or any reference in that issue? Thank you very much.
This is my first post on the Research gate, thank you for the help. I am working on TI TMS320F28379D, I need three triangular signals with 120-degree phase shift for my experiment to give it to the control card, Anyone has any idea about to generate on Hardware?
Are there any advanced control strategies which could directly handle the non linear system for controller design, without doing any sort of linearization? Please give specific suggestions in this regard. Also please suggest some good sources to learn about the advanced nonlinear controller design for power electronic converters.
While learning about different algorithms such as Regression, Clustering, Classification, etc. in Machine Learning in different domains such as Medicine (Patient data analysis, etc.), Market analysis, etc. I wonder, how these algorithms could be implemented in Power Electronics or Grid Applications? Any ideas?? Are there any datasets available similar to the ones in UCI ML repositories??
Thanks in advance.
For a switched-mode power supply, can volt second balance be applied to capacitor voltages too at different operating modes or is it only restricted to inductors?
Is it technically correct to express capacitor voltages in terms of the inductor, so as to apply VSB?
Please explain in detail!
I am planning to connect the batteries in series to obtain 800 V DC and interface it with the AC bus using only the voltage source inverter (VSI).
If I do so, what are the practical implications?
Is it advisable to connect the battery energy storage to the AC bus using only the inverter, and without a bidirectional DC-DC converter?
I want to use multiple DSTATCOM in my project,thus it's price is very important to be minimum.This device is the same with single phase inverter, but it injects reactive current only to the connected node in parallel to the 1-phase load.could anyone please inform me./thanks/