The Industry
A large number of automation equipment in commercial complex automation systems requires high quality power supply.However, a considerable part of these devices have become the harmonic distortion disturbance source of the low-voltage power supply system due to their nonlinear load characteristics.Cause distribution system pollution, harm to the surrounding communication system and even the distribution system.
The background
Commercial complex harmonic mainly has the following two sources:
The Problem
The load in the commercial complex system mainly includes lighting, elevator, central air conditioning, etc., among which the single-phase load equipment such as lighting mainly produces 3 harmonics, while the elevator and central air conditioning load driven by frequency converter mainly produces 5,7,11 and 13 harmonics.For the harmonic situation of commercial complex system, the best solution is to adopt active filtering technology.The active filter device adopts advanced power electronics technology to detect the harmonics in the grid in real time, generate the reverse phase compensation current through the converter, and dynamically filter out the harmonics in the grid.
The Solution
The main load of Shanghai National Exhibition Center is elevator / escalator, water supply system pump and air conditioning fan inverter, office and computer network, UPS power supply, electronic lighting, etc., which produces a large number of harmonics in the process of use. According to the site situation, we configure 400A active filter cabinet, and the following is the on-site governance effect.After the YTPQC-APF active power filter device treatment, the current waveform is well improved, and the harmonic current distortion rate is reduced from 34.7% to 1.5%.
The Performance
The Picture
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