energy has a key role in optimizing quality of power in industry by providing innovative solutions for the active harmonic filter . this case study deals with the effectiveness of the harmonic filter in qazvin ‘s useful glass factory by focusing on the 250 kW induction furnace which faces high harmonics .
qazvin plain glass factory
qazvin plain glass factory is one of the active industrial units in qazvin province that specializes in the production of industrial and industrial glass . the plant is located in the industrial zone near qazvin with more than 8 industrial estates . the project location in the production unit is induction furnaces which is faced with the use of a diesel generator and the need for a harmonic filter for energy stability .
induction furnace
inductive furnaces produce thermal electromagnetic fields and are used to melt materials such as glass . in the useful glass of qazvin , an induction furnace of 250 kw with power transducers , هارمونیکهایی to THDi % , generates 53 % , which requires the use of a harmonic filter for power quality management .
measurement equipment
C.A 8331 device is used for monitoring power quality . it measures parameters such as thd and flickr and helps regulate the active harmonic filter with AmpFLEX probes .
harmonic source and its effects
the harmonics of non – linear loads are caused by inductive furnaces and اعوجاجی to THDi . this has led to the increase in losses and the need for an active harmonic filter to tackle the problems of setting up generators .
Harmonic measurement table before filter installation
| Location (network) | THDI (%) | THDU (%) |
|---|---|---|
| Before installing the filter (250 kW induction furnace) | ۵۳ | ۴.۷ |
Honam Part Energy Active Harmonic Filter
Three 150-amp Honam Part Energy Active Harmonic Filters have been installed with compensation for 2nd to 50th order harmonics and reactive power up to 45 kvar, enabling stable generator startup.
Harmonic measurement table after filter installation
| location (grid) | THDI (%) | THDU (%) |
|---|---|---|
| After installing the filter (250 kW induction furnace) | ۱.۶ | ۱.۵ |
analysis of economic results and benefits
the installation of the active harmonic filter increased THDi to 1.6 % and THDu to 1.5 % and improved power coefficient to 0.99 . the annual savings of 120 million riyals in energy losses and 200 million riyals in the costs , along with the liberalization of 25 % of the generator capacity ( 500 million riyals ) , has created significant added value .
