Midea refrigerator power quality solution

1. Industry overview

The United States refrigerator is a well-known domestic brand, household name, and the United States product production process is also strict requirements, the use of equipment is also advanced mechanical equipment, these equipment are composed of power electronic devices, so the United States company a large number of mechanical equipment will produce a large number of harmonics, these equipment are precision instruments, The power quality directly affects the accuracy of equipment analysis data, so it is very important to improve the power quality of its power supply system.

2. There are problems

There are two main problems in the power supply system of the refrigerator manufacturing industry:

1) More complex harmonic currents, while there are higher harmonics.

2) The existence of harmonics leads to power electronic devices with high power quality requirements in the automation program, and a large number of power electronic devices, switching power supplies, air conditioning facilities, frequency converters, welding machines, stamping machines, etc. are used in the refrigerator manufacturing process. These loads are typical harmonic sources, which will cause device burn or no action or misaction, directly affecting the quality of the refrigerator.

3) Capacitor cabinet capacitance reduction, bulge in the cabinet, can not be used normally.

3. Cause harm

a) Voltage: the voltage fluctuation range becomes larger, the voltage is unstable, and the voltage distortion is large;

b) Harmonics: harmonic superposition, increase the harmonic content, reduce the safety of the system;

c) Current: current distortion increases, system and equipment loss increases, heat increases, and cable aging accelerates;

d) Low power factor;

4. Solutions

Add the wall-mounted ZPAPF active filter device, which has the characteristics of fast response, filtering 2-50 harmonics, filtering the harmonic current generated in the system, reducing the current of the neutral line, stabilizing the voltage, purifying the power grid, reducing the harmonic current and harmonic voltage value in the system, improving the power quality of the system, and meeting the requirements of power quality of automated power electronic devices. For the rectification in the on-site capacitor cabinet, the contactless thyristor switching mode is adopted. PU soft resin aluminum shell capacitor. To create a green power supply system.

Power Quality series -ZPAPF parallel active power filter device. ZPSVG static reactive power generator. ZP-PQI intelligent hybrid filter compensation device, ZP-STB intelligent voltage regulator and power saving device ZPTBB, ZPFC high voltage reactive power compensation device;

Power distribution energy saving series --ZPGQ motor intelligent solid state soft start device. ZP-BQ integrated machine series inverter, electric complete sets;

Voltage regulator, voltage regulator series --SBW automatic compensation type power regulator, SBW-H three-phase high-precision automatic AC regulator, ZP-UPS uninterruptible power supply;

Component products --ZP-CE low voltage capacitor, ZP-LE low voltage series reactor, ZP-T thyristor switch, ZP-ZC intelligent power capacitor;

Power construction series - electrical, distribution equipment upgrading, online testing, installation, technical services.