Electrical Characteristics of Electric Traction Loads
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◆ voltage fluctuations and flicker: when the locomotive belongs to the belt load operation, the rest of the time is equivalent to no-load. Therefore, locomotive traction load belongs to large-capacity impact load. The drastic changes in load lead to drastic voltage fluctuations and flicker in the traction substation busbar.
◆ Harmonic problems are serious: electric locomotive usually adopts single-phase rectifier supply mode, and the harmonic content in load current is very rich, including all odd harmonics. Therefore, the traction substation mostly needs to install a filter.
◆ low power factor: electric locomotives are typical inductive reactive load, starting and braking consume more reactive power. At the same time, there will be "no reactive power transmission" phenomenon in the substation. Due to the power sector on the measurement of reactive power generally adopt the "reverse" policy. According to statistics, the monthly average power factor of the traction substation is generally around 0.6 ~ 0.8, and it is required to face huge fines every year from the power sector.
◆ Three-phase imbalance: The electrified railway belongs to the typical single-phase load. The serious negative sequence problem is a typical electrical characteristic of the traction load.
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solution
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Selection of high-voltage dynamic reactive power compensation device filter channel general configuration 3 times, 5 times, 7 times and 11 times
At the same time, for all low-voltage systems, low-voltage dynamic reactive power compensation device is configured to absorb the main harmonic components in the system; In the serious pollution of low-voltage system, configure the parallel active power filter device; In the key load, intelligent hybrid filter compensation device , In order to achieve the best governance effect.
