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The Prediction of Lithium Battery Life in Cellular Telecommunication Stations
(2022-01-01)
Khemmook, Panya
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Pairindra, Worapong
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Phophongviwat, Teeraphon
This research paper introduces the remaining useful life prediction of lithium batteries operating at 48 V, 100 Ah on the cellular telecommunication substation with the load supply current conditions 1C rate at 100% DOD. According to the prediction technique, a 100-cycle of experimental results of actual discharge time are used to create the equation by using the curve fitting technique. Finally, the obtained results can estimate the battery lifetime and identify the time which will be able to supply the battery's load if the battery is operated under any conditions.
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The implementation of fundamental harmonic approximation technique on electric vehicle wireless charger
(2021-05-19)
Pairindra, Worapong
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Khemmook, Panya
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Khomfoi, Surin
This paper presents the electric vehicle (EV) wireless charger by using the practical design frequency converter. A 500 W LLC series resonant full-bridge converter for demonstrating prototype with the standard charging frequency range 85 kHz to 100 kHz is connected to the transmission coils with 10 cm air gap and performed a power transfer from the source to the EV batteries. The resonant converter with the Fundamental Harmonic Approximation (FHA) technique is chosen in this proposed paper for transferring the highly magnetic coupling between the transmitter side to the pickup side. The overall system is designed by MATLAB/Simulink program, and the experimental result efficiency can be measured out by approximately 80%.
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Solid state transformers using selective harmonic elimination technique for solar farm applications
(2020-01-01)
Khemmook, Panya
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Khomfoi, Surin
Solid state transformers using selective harmonic elimination technique for solar farm applications are presented in this paper. As known, the usage of photovoltaic to generate electricity in the form of solar power plants in Thailand is one of the major renewable energy resources. In addition, a Solid-State Transformer (SST) with the application on the solar power plant in Thailand begins to be considered as an alternative solution. Since an SST has the ability to eliminate the core losses during non-operating condition, it can gain more efficiency compared to a conventional transformer. In addition, an SST is smaller and lighter than a conventional transformer because it will normally operate at high frequency. In addition, an SST has a variety of functions, which can be ancillary service devices for an electrical system to help maintain electrical stability, harmonic filter, power fluctuation regulator, power flow controller and increasing of the limitation of transmission lines etc. An SST can gain higher efficiency by using Selective Harmonics Elimination (SHE) techniques for generating Pulse Width Modulation (PWM) signals. This technique offers several advantages such as simple implementation, uncomplicated techniques, and compatibility with various sequences harmonic elimination in a seven-level cascaded h-bridge multilevel inverter. The proposed SHE technique can search a set of angles that gives the lowest percentage of the total harmonic distortion voltage (%THDv). Then, the calculated angles can be used to fine tune again for optimal angle in the proposed controllers. The proposed seven-level cascaded h-bridge multilevel inverter is developed to validate the proposed controller for transferring power via a High Frequency Transformer (HFT) at 10 kHz. The results show that the power losses with the SHE technique using the optimal angles can be reduced up to 1.45% at HFT comparing to quasi-square waveform techniques. The performance of this proposed SST is validated with both simulation and experimental results. The validated results illustrate that the developed SST is a promising solution for a solar farm application.
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Deteriorated solar panel detection technique of SST for a solar farm application
(2019-03-01)
Khemmook, Panya
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Khomfoi, Surin
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Phophongviwat, Teeraphon
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Pairindra, Worapong
This proposed paper introduces the fault detection method for solar cell with Box Plot technique on the Solid State Transformer (SST) for the solar farm application. The Box Plot technique with inclusive quartile value is functioned for finding the upper and lower limit for data analysis. Normally, the fault detections of solar panels are found by using the PV string current from the SST to calculate the upper and lower limit of the Box Plot. If one of the string currents is in the specific outer boundary, therefore, the solar panels are in non-operational condition mode. Generally, the fault detection testing for the solar panels can be categorized in 5 cases: normal condition, open circuit condition, line-line condition, partial shading condition and degradation condition. Finally, based on the simulation result and the actual results, the Box Plot is able to monitor the performance of the PV string according to various conditions as efficiently as possible and accurate.
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The implementation of SHE control technique for the SST with CHB seven-level waveform on the solar farm applications
(2019-03-01)
Khemmook, Panya
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Khomfoi, Surin
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Phophongviwat, Teeraphon
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Pairindra, Worapong
This proposed paper presents the use of selective harmonic elimination (SHE) technology to control the cascaded H-Bridge Multi-level Inverter (CHBMI) for power transferring over the high frequency transformer (HFT), which is a part of the SST for applying to a solar farm. Apparently, the converter is using the seven-level CHBMI and the SHE technique to get rid of the 5th harmonic and 7th harmonic to find a set of angles θ<inf>1</inf>, θ<inf>2</inf> and 63 with the lowest 3rd harmonic. The calculated angles are used in each modules. Obviously, the simulation has shown that, at m<inf>a</inf>=2.43, θ<inf>1</inf>=11.6782°, θ<inf>2</inf>=26.8870° and θ<inf>3</inf>=56.0271°. The total harmonic distortion (% THDv) will be lowest at 9.35%. According to the experimentation, the SHE technique with low % THDv can reduce the power loss at HFT compared to the square wave transmission technique which the % THDv is high.
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Transient stability improvement using coordinated control of solar PVs and solid state transformers
(2018-11-01)
Khemmook, Panya
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Khomfoi, Surin
An optimization coordinated controller applied for solar farm together with a solid state transformer in order to improve transient stability is presented in this paper. Transient stability issues in a modern electrical power grid represent one of the challenge topics for an electrical engineer because uncertain renewable energy resources (RES) are increased because of a demand for green energy requirement. This increased RES can adversely disturb a terminal voltage; consequently, a damage to electrical equipment can happen. In order to solve a transient response issue, it is possible to use a solid state transformer (SST) or intelligent transformer, used to interface between RES and a power grid. SST consists of a set of converters which can be modulated via the converters to maintain the desired voltage levels; thus, this solution can reduce transient response and power fluctuation concurrently. For this reason, this paper presents a controller design for a solar photovoltaic (SPV), connected to a power grid via SST in order to enhance the quality of power injections from RES to improve transient stability of the electrical system. The optimization of a controller model is proposed by modifying a PI controller from a commercial one. The proposed controller is validated with the standard IEEE 39 buses. The validation scenario of both an uncertainty due to time delay accounting for a range of 425ms-525ms and various solar radiation patterns are also taken into account for the evaluation of a proposed controller performance. Simulation results demonstrate that power fluctuation due to uncertain RES can be mitigated by using the proposed controller. Moreover, in case of large disturbances such as a circuit breaker tripping to open a power line due to a fault, the proposed coordinated control of SPV and SST can satisfactorily perform to suppress severe voltage swings within an electrical device rated voltage limit to protect catastrophe damage. The results suggest that the proposed controllers can be alternative solutions in order to solve a transient stability issue due to uncertain increased RES in a modern power grid.
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Reactive power compensation for solving voltage problems in PV farm based upon IEC - 61850
(2017-11-03)
Uaroon, Suntichai
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Khemmook, Panya
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Khomfoi, Surin
Reactive power compensation for solving voltage problem in PV farm based upon IEC 61850 is presented in this paper in order to control voltage within acceptable range. The Volt/VAR control is used in solar inverter of PV farm to improve power quality and also reduce the disconnection of solar inverter caused by overvoltage. So, the owner of PV farm will get more opportunity to sell solar electricity back to the grid. For Volt/VAR control, solar inverter with PQ mode is used to control the active and reactive power of the system. Electricity data from substation are sent to PLC based upon IEC 61850, which is the standard communication of electrical substation system. In this paper, simulation result verifies that Volt/VAR can be improve a power quality in a PV farm.
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The design of the PI controller with SmartCtrl for the Solid State Transformer in the solar farm application
(2017-11-03)
Khemmook, Panya
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Khomfoi, Surin
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Manee-In, Chaitouch
This paper presents design and control a suitable power electronics transformer (Solid State Transformer, SST) that is suitable for applying to be application in solar farm in Thailand by using Power Simulation Version 9.1 (PSIM 9.1). SmartCtrl is a toolbox of the PSIM 9.1 program that is used to design PI controllers and find the optimal gain automatically. The advantages of designing a controller with SmartCtrl are used to interface or work with other applications, simplified to use and not complicated, simulation results are easy to understand and analyze, and the controller from the design is stable. The PI controller from the design from the SmartCtrl to for using with Solid State Transformer in solar farm applications work satisfied and very well as confirmed by the simulation results.
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Suitable power transformers for solar farm applications
(2015-08-17)
Khemmook, Panya
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Suwan-Ngam, Warachart
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Khomfoi, Surin
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.

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