Suwanngam, Warachart
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Preferred name
Suwanngam, Warachart
Alternative Name
Suwan-Ngam, Warachart
Suwan-Ngam, W.
Main Affiliation
Email
warachart.su@kmitl.ac.th
5 results
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Item type:Publication, A PSPWM with variable frequency control for a two-output three-level series resonant inverter(2015-08-17); This research paper presents a two-output three-level series resonant inverter by using phase-shifted pulse width modulation with a variable frequency control technique. In order to achieve the boundary condition of operation under ZVS for all switches, this paper will analyze this condition which depends on operating frequency and phase-shifted angle between the gate signals of the outer switches and the inner switches. In addition, the proposed circuit was designed, built and tested. The test has two cases which include fixed frequency control and variable control method. From the experiment, the fixed frequency control cannot obtain the ZVS condition of switches for all phase-shifted angle values. On the other hand, the variable frequency control can maintain the ZVS condition for all phase-shifted angle values that is in line with the proposed concept. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Implementation of two-output three-level series-resonant inverter for induction melting application(2018-01-12); This study aims to present a two-output three-level series-resonant inverter together with an implementation and experiments for an induction melting application. A three-level circuit is applied for each branch of inverter in order to decrease the voltage stress on switching devices. A phase-shifted pulse-width modulation (PSPWM) with variable frequency control is applied for providing and maintaining a zero-voltage switching condition over a wide load range. In addition, the PSPWM could provide symmetrical output voltage and current waveforms that result in decreasing the THD<inf>v</inf> and THD<inf>i</inf> of output waveforms and harmonic losses of high-frequency transformer cores comparing to other PWM schemes. Finally, the prototype was designed, built, and tested to verify the consistency between the experimental results and theories of the proposed inverter. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Suitable power transformers for solar farm applications(2015-08-17); This paper presents a suitable power transformer for solar farm applications. Losses and economic value of the proposed transformer are compared to those of the standard transformer, for the application to a 1 MW solar farm, to help the solar farm owners select the best solution for their business. In this paper, a power electronics transformer called a Solid State Transformer (SST) is also proposed for the application to the solar farm because of its light weight, small size and varieties of functions. There are no core losses during no operation period which is about 15-16 hours a day. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Efficiency improvement of a dual-active-bridge isolated bidirectional DC-DC converter(2019-07-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Application of the DC-link current sensors of the back-to-back converters for the operation of a doubly-fed induction generator(2016-01-18); The aim of this paper is to propose the application of the DC-link current sensors of the back-to-back converters for operation of a doubly-fed induction generator (DFIG). The operation of the DFIG is first discussed. The measured DC-link currents are used reconstruct the AC current waveforms for operation of the DFIG under different operating modes. The feasibility of the proposed application is investigated by simulation and experiment. The limitations of the proposed topology are discussed. The fault tolerant operation while the fault occurs at the AC current sensors is also discussed.