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Simple Techniques for Designing Passive Power Filter System to Reduced Harmonic Resonance and Improve Power Quality of Electrical Systems with Servo Drive
(2020-11-24)
Boonseng, C.
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Boosseng, R.
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Kularbphettong, K.
The proliferation of servo drives (SD) in the industry has led to serious concerns about harmonic resonance and power quality in electrical distribution systems. This paper reported the resonance conditions of electrical systems with motor control using a small servo drive for use in CNC machines. When a large number of servo drives are combined, it results in harmonic resonance occur in the system. Resulting in the destruction of electrical equipment such as power supply, computer, CNC, or servo drive close to each other, etc. The cost of purchasing the above electrical equipment to replace the damaged ones in each month is very high. A simple passive power filter system (PPFs) design is recommended to reduced harmonic resonance. PPFs are applied to the system and the actual installation which is satisfactory and can greatly reduce the damage of electrical equipment. Finally, the factories can save money each month.
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Failure Analysis and Investigation of Electrical Insulation of 10 MVA Oil-Type Transformers Damaged due to Direct Lightning Strikes
(2020-11-24)
Boonseng, C.
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Kammaroeng, D.
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Kularbphettong, K.
Failures in distribution transformers are associated with high property damage, high business interruption losses and large insurance deductibles. Professional independent inspection and protection design, taken on an ongoing basis, can go a long way towards reducing failures and eliminating unnecessary repair costs. This paper presents the study of the effects of lightning on electrical insulation, damage, and components in and components in 10MVA, 24/6.6kV oil-type transformers. Beginning to investigate and diagnose the cause of the transformer explosion by measuring electrical parameters to confirm which parts have been damaged. The result of the measurement shows that there is a fault in the HV coil. The investigation method focuses on the damage and solutions to prevent the problem from occurring again. Finally, a lightning protection design is necessary.
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UPS System Design with Appropriate PPFs to Prevent Harmonic Resonance and Power Quality Improvements for MRI Scan Equipment
(2020-11-24)
Boonseng, C.
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Ratanasrimetha, T.
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Boonseng, R.
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Kularbphettong, K.
Magnetic Resonance Imaging (MRI) has become an essential diagnostic tool as it is a noninvasive method for diagnosing individuals of almost all ages. Using magnetic fields, MRI can produce images of the spine, brain, and other parts of the human body. This can eliminate the surgical difficulty to diagnose. In most MRI operations, it is used in conjunction with UPS to enable continuous operation and prevent power outages and system failures. In most MRI operations, it is used in conjunction with UPS to enable continuous operation and prevent power outages and system failures. MRI work at full output will generate a lot of harmonics and cause resonance at the output of the UPS to overheat and cause the UPS to reach trip. Solving this problem by using passive power filter system (PPFs) which is effective can solve this problem.
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Planning, Design and Installation of a Hybrid Power Filter to Power Quality Improvement for Grid-Connected Renewable Energy Systems
(2020-11-24)
Boonseng, C.
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Boosseng, R.
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Kularbphettong, K.
This paper is a preliminary basis in the design, planning, and implementation of hybrid power filter systems (HPFs) for application in grid-connected solar rooftop at industrial plants beginning the planning and designing of a 260 kWp solar rooftop according to the factory roof size. Calculate total returns by using the PV system design software program to find the total kWh received per year. As the power system in this factory has a load that is sensitive to power quality and harmonics, it is necessary to design a harmonic protection system by choosing the HPFs to reduced and control the harmonics. Noise filters should be used to prevent high-frequency signals from entering the electrical system. In addition, lightning protection devices are also designed by using the bus bar to connect the system to the ground. All actions have been carried out in accordance with the designed plan and able to perform as intended.
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Analysis of Control System to Prevent Collapse of Mixed-Source DC Microgrid for Industry
(2020-07-01)
Boonseng, C.
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Kularbphettong, K.
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Boonseng, R.
This paper presents the control of power sources by lookup table controller to maintain the voltage of critical load and to prevent the collapse of a mixed-source DC microgrid which consists of grid, diesel generators, batteries and solar cells that connect to DC bus. MATLAB is used to a simulation of the microgrid system. The experiment presents the time comparison of four types of switches including magnetic contactor, relay, solid-state relay and power MOSFET which can maintain DC bus voltage in a specified range which least effects to critical load operation. Finally, applied in the data center system of a small factory which has satisfactory results.
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Comparison of Harmonic Solutions to Power Quality improvement for Grid-Connected Solar Rooftop Applications in Industrial Plants
(2020-07-01)
Boonseng, C.
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Kularbphettong, K.
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Boonseng, R.
The solar rooftop installation is currently grown in Thailand, when many solar inverters are connected to the grid. It impacts existing electrical systems such as the harmonic resonance occur and malfunction of sensitive equipment. In addition, electrical circuit breakers, contactors, fuses, and power capacitors are damaged, which can affect electrical quality in the system. The impact of solar rooftop installation on the reliability and security of existing power grids must be urgently analyzed. This paper examines and selects methods to reduce the harmonic effects caused by the increase in solar inverter installation in existing power systems. The main objective of the study is to reduce distortion and harmonic resonance problems in the system, as well as to select suitable methods for solving problems. Practically, it is ensured that the passive power filter system (PPFs), active power filter system (APFs) and hybrid power filter system (HPFs) are the best solution applied for grid-connected system. A method for selecting a suitable solution for solving problems in each plant was proposed. A comparison of the solutions to all three methods has been analyzed for maximum benefit. Guidelines, procedures, and operational requirements can be applied in industrial plants.
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HPFs filtering solutions for reduced the harmonic current generated by SMPS and ac drive systems
(2020-02-01)
Kularbphettong, K.
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Boonseng, C.
This paper proposes a reduced 2nd, 3rd, 5th and 7th harmonic current of all power supply units and ac drives which effects of heating neutral cables and transformer. The commercial or automation building require the operation of many parallel-connected switch mode power supply and ac drive on the same bus and transformer. Such a system significantly increases the high neutral current and power quality problems on the distribution network. The existing system mainly consists of switch mode power supply and a three phase ac drive for compressor loads (common to HVAC applications). A passive power filter (PPF) and a low rating APF (Active Power Filter) at point of common coupling (PCC) are used to power quality enhancement in the distribution system. A PPF is designed to reduce the harmonics and to compensate the reactive power in the distribution system and the APF located at an upstream position near main distribution broads (MDB), it performs the compensation for harmonic current which is produced from all of drive and for remaining harmonics after the PPFs can been operation. The Hybrid Power Filter System (HPFs) is the combination of PPF and APF which mostly use for reducing harmonic currents and improving power quality of the system. Finally, using the HPFs to solve this problem, the results can reduce distortion and neutral current.
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Field Experience for Passive Power Filter for Grid-Connected Solar Rooftop Applications at Industrial Plants
(2019-10-01)
Inwanna, W.
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Boonseng, C.
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Boonseng, R.
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Kularbphettong, K.
This paper presents the solution of harmonic problem that caused by solar rooftop installation. The Passive Power Filter System (PPFs) is recommended for solving harmonic problem which produced from non-linear loads such as AC drive, SMPS and solar inverter. The PPFs is designed to eliminate the harmonic in the electrical system, result in the voltage and current distortion are reduced and avoid resonance problem. Moreover, it helps to compensate the reactive power and improve the power factor. The characteristic of PPFs is analyzed based on the simple calculation by the KMITL program. In practical, the PPFs is suitable for low voltage system which connected to the grid. There is high performance in solving harmonic problems in the electrical system.
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Designing Harmonic Filters for Improving Power Factor and Quality of Synchronous Generator in Sugar Mill Plant
(2019-10-01)
Boonseng, C.
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Kularbphettong, K.
This paper presents a study of the harmonic filter design to reduce harmonic distortion caused by harmonic sources such as dc drives. Because of output current of synchronous generator (SG) was very high at low power factor (PF=0.6) and it is high temperature at stator coil around 115-125°C. The control exciter and main exciter of rotor are over load after that the turbine is trip. To avoid problem caused by the harmonics producing DC drive, the Passive Power Filter System (PPFs)are presented. The analysis includes the basic principles, the computer program and economic aspects of harmonic filter design. The major objectives in the study are (i) to improve the power factor, (ii) to reduced current and voltage distortion, (iii) to reduced resonance problems at a synchronous generator. Practically, it is ensured that the PPFs is best applied for standalone synchronous generator. The results show that the 5th filters are a very appropriate solution for most typical harmonic problems.
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Field Experience Hybrid Power Filter for Power Quality Improvement in Industrial Plants
(2019-10-01)
Inwanna, W.
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Boonseng, C.
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Boonseng, R.
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Kularbphettong, K.
This paper presents a simple of harmonic filters design to minimize harmonic distortion caused by a harmonic source such as power electronic device. To avoid problem caused by the harmonics producing power electronic devices, the Hybrid Power Filters System (HPFs) are presented. The analysis includes the basic principles of harmonic filter. Passive Power Filter (PPF) can be designed by the KMITL Program. Surplus harmonic can be removed by active power filter(APF). The major objectives in the study are to improve the power factor, to reduced current and voltage distortion and to reduce resonance problems at a system. The results show that the HFs are a very appropriate solution for most typical harmonic problems and power factor correction for improvement in industrial plants.

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