Load characteristics
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The petrochemical industry often adopts such production lines (inverter and UPS) as distillation, cracking, catalysis, hydrogenation and furfural refining in medium and low pressure frequency conversion and speed control drilling rigs, submersible pumps and fans as well as polyester chip type coking dump trucks Other equipment.
Low-voltage power distribution system in petrochemical enterprises, the main source of harmonics are: pump frequency control device; uninterruptible power supply unit; DC power supply substation complete sets of equipment; motor soft start equipment; new lighting (energy-saving lamps, electronic ballast Fluorescent lamp)
It is used for power supply of load which is particularly important in primary load. These loads include process control DCS system, computer monitoring system of distribution system, fire alarm system and factory intelligent information management system.
The main existing problems are:
◆ Low voltage power factor is too low, reactive power consumption is large, the need for input capacitor compensation, but the harmonic pollution caused when the capacitor is put into operation caused by resonance, resulting in capacitor several times its own rated capacity overload damage, affecting the normal operation of the system , So the current compensation method for high-pressure compensation, to meet the power sector required power factor index.
◆ A large number of harmonics into the high-voltage side will lead to other important load such as DCS system, monitoring system abnormalities, affecting the normal production and life.
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solution
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Adopting intelligent hybrid filter compensation device, the filter compensation module mainly absorbs the characteristic harmonic current, and most of the load harmonic current can be filtered out. APF module to offset the dynamic filter compensation module after filtering the remaining harmonics, to achieve fast and efficient precision filtering; and filter compensation module reactive power fine-tuning function to achieve two-way continuous single-phase high-efficiency reactive power compensation will be Will receive good results.
