Overview
In recent years, as the pace of urban modernization continues to accelerate, intelligent buildings have gradually developed into intelligent building group, intelligent blocks, intelligent cities, intelligent countries and even intelligent earth. Therefore, intelligent buildings have also become a symbol of the economy and strength of a region, a city and a country.
The harmonic source formed by a large number of non-linear loads such as electrical equipment and electronic equipment generates harmonic and reactive power, which causes serious pollution to the power distribution system and influences the power quality. It not only brings serious harm and bad effects to electrical equipment, electronic equipment and distribution system in intelligent buildings, but also brings harm to electrical and electronic equipment outside the power distribution system in intelligent buildings.
Various accidents and faults caused by harmonics and reactive power cause huge losses to national economic production and life. Therefore, in order to reduce building energy consumption and improve power efficiency, the combination of active harmonic filter and reactive power compensation for harmonic control plays a vital role in the efficient operation of intelligent buildings.
Reference Standards
GB/T14549-93 Power quality: grid harmonics
GB/T15543-1995 Power quality: allowable unbalance of three-phase voltage
GB/T15945-1995 Power quality: allowable deviation of power system frequency
GB/T12326-2000 Power quality: voltage fluctuation and flicker
GB/T12325-2003 Power quality: allowable deviation of power supply voltage
GB/T18481-2001 Power quality: temporary over voltage and transient over voltage
GB/T15576-1995 General specification for low-voltage reactive power static compensation devices
GB7625.11998 Limits of harmonic current emitted by low-voltage electric and electronic products
GB4208-93 Classification of Degrees of Protection Provided by Enclosures
Application Background Analysis
Computers, networks, modern communication systems and a large number of electronic equipment are very sensitive to harmonics The practice shows that many kinds of abnormal wave forms from the power supply system pose a serious threat to the normal operation of sensitive electronic equipment, even destroy the hardware, cause data loss and huge economic losses. The harmonic generated by a large number of electronic equipment and electrical equipment in intelligent buildings seriously pollutes the power distribution system. With the rapid development of intelligent buildings and intelligent communities, if the management is not effective, this kind of pollution will become more and more serious and will become the main pollution source to the power grid.
Therefore, it is of great significance to adopt an appropriate power quality management system for intelligent buildings to improve the power quality of power grids and improve the functions and benefits of intelligent buildings.
Schmem Composition of Power Quality System for Intelligent Buildings
