KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/kmitl/1

Browse

Settings

Access type: UnknownSubject: search.filters.subject.Harmonic distortion

Search Results

Now showing 1 - 4 of 4
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Power quality analysis of grid connected solar power inverter
    (2017-07-25)
    Phannil, Natthanon
    ;
    Jettanasen, Chaiyan
    ;
    Ngaopitakkul, Atthapol
    Photovoltaic (PV) energy has been widely interested today because it is clean and endless energy without causing pollution. To produce electricity from solar energy, it would be required an inverter to convert the direct current into alternating current. The inverter is the cause of problems that affect the stability of the power system because it is a switching device served to adjust the frequency of the AC power as needed. At the same time, it can cause harmonics which result in waveform distortion and affect electronic devices that receive power. Then, it could make electronic device malfunction. This paper studies the characteristics of harmonics on grid, PV system, and load. The result shows that most grid's harmonics are affected from PV system and load when the inverter power up to almost the rated power, meanwhile, percentages of harmonics are reduced and harmonics of load depend on the type of load. Next, comparing harmonics on three sides, and found that harmonics of PV system hardly affect to load and harmonics of grid are more affected from load than PV system.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    The study of harmonic reduction in Light Emitting Diode (LED) roadway lighting system
    (2016-07-25)
    Yoomak, Suntiti
    ;
    Ngaopitakkul, Atthapol
    Since electrical energy is essential in human life, it is necessary to find out a way to reduce its consumption. In the past, in Thailand, they had to provide much energy to roadway lighting system because main lighting equipment has consumed high energy to generate lighting in the roadway. But today, we are increasingly aware of energy consumption. As a result, Light Emitting Diode (LED) luminaires are considered to be used in roadway lighting system, to replace conventional inefficient lighting lamps; this is due to their greater energy efficiency, high color rendering index (CRI) (70-90), and long life. However, LED luminaires have some disadvantages concerning harmonic generation issued from LED's driver. Hence, in this paper, LED luminaire will be studied in terms of power quality improvement by using AC-side Inductor Harmonic Filter. An experimental setup will be designed to measure the electrical parameters. The experimental results show that, without the filter, LED luminaire contains much harmonic current distortion (THDi), but when inserting the filter, the harmonic current distortion is decreased. However, to ensure the overall functioning of the system, the final results of harmonic current distortion should be complied with the limit value of IEC 61000-3-2 standard.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Design and implementation multilevel inverter for 3φ induction motor speed control with RBM chopper technique embedded on FPGA
    (2006-01-01)
    Tipsuwanporn, V.
    ;
    Keanthong, K.
    ;
    Charean, A.
    ;
    Runghimmawan, T.
    This paper introduces on designing of Regular-based Binary Multiplier: RBM signal embedded on Field Programmable Gate Array: FPGA, which control induction motor speed. Various form of 8-bit RBM signal are generated and choppered with the multi level -inverter output voltage whose switching angle is provided for determining amplitude of fundamental frequency and eliminating unrequired low-order harmonics. Objectives of this switching technique is improvement of the inverter output signal in term of total harmonic distortion voltage reduction (%THD) while controlling the motor. Such motor's efficiency and performance are improved while voltage to frequency ratio is maintained constantly for stable torque during control. © 2006 IEEE.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    ±1.5V high performance CMOS rail to rail voltage follower
    (2002-01-01)
    Kasemsuwan, V.
    ;
    Boonyaporn, P.
    ;
    Thanachayanont, A.
    A ±1.5 V high performance CMOS rail to rail voltage follower is presented. The circuit is based on the symmetrical class AB voltage follower and can operate under supply voltages of 1.5 V. The proposed circuit has power dissipation of 5.2 mW under quiescent condition and can drive ±1.25 V to 250 Ω load with a total harmonic distortion of less than 0.5 percent and cut-off frequency of 237 MHz. Although simple, the proposed circuit enables the output transistors to drive the load efficiently.
      1