Power quality solutions for power distribution in the factory

1. Industry overview

Kaisheng Heavy Industry is a large coal mining machinery manufacturer, the company's products cover coal, mining, metallurgy, building materials, chemical, electric power, engineering, environmental protection and other industries. The use of a large number of frequency conversion equipment and other nonlinear equipment, these equipment produce a large number of harmonic current during the working process, causing serious harmonic pollution to the distribution system, the later plant roof to increase photovoltaic power stations, low-voltage side grid-connected, resulting in the original system power factor seriously reduced, not up to standard, a large number of monthly force adjustment costs fines, and affect the safe operation of the distribution system and the stability of electrical equipment.

2. There are problems

1) Multiple harmonics affect the power quality of the power supply system;

2) After harmonic superposition, the comprehensive power factor of the system is low, which cannot meet the requirements of power supply assessment;

3) Photovoltaic power station power access, resulting in smaller active power, and even residual power online phenomenon, resulting in low power factor;

4) A large number of harmonics lead to distortion of communication network signals, abnormal equipment backup, and low service life of equipment

5) Harmonics interfere with communication and automatic control systems, resulting in high and low voltage distribution equipment working abnormal, causing serious heating of cables, transformers, motors and other equipment, increasing the failure rate of equipment, resulting in electrical accidents, reduce the reliability of power supply

3. Solutions

According to the load characteristic analysis and test results, the intelligent hybrid filter compensation device is used to filter the load harmonics efficiently, restrain the system oscillation, and improve the stability of the power grid. ZP-PQI series intelligent hybrid filter compensation device applies the latest technology, based on the economy of TSC\SVC and the strong efficiency of APF filter, the combination of the two technologies breaks through the traditional reactive power compensation technology, and achieves the best harmonic control and reactive power compensation effect while effectively reducing the cost. The device is mainly used to compensate the reactive current, harmonic current and three-phase unbalanced current in the power grid, so as to achieve the goal of improving power efficiency, energy saving and power quality, and the control system has a four-quadrant function, which can be applied to various power supply conditions.

4. Governance effect

1) After the ZP-PQI series intelligent hybrid filter compensation device is put into operation, most of the harmonic current of the system is eliminated and the power supply quality is improved;

2) Configure a 7-inch man-machine interface, which can monitor the power parameters of the grid in real time and facilitate man-machine interaction. Applicable to various power supply conditions, real-time tracking compensation;

The average monthly power factor is above 0.98 after treatment.

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.