Power quality refers to the quality of AC power supplied to users through the public grid. Generally speaking, it refers to the power quality of the grid lines. The power quality problem is mainly caused by the terminal load side. For example, the impact of reactive load will cause the grid voltage to fluctuate drastically and reduce the quality of power supply.

With the development of power electronic technology, it not only brings positive aspects of energy saving and energy conversion to modern industry, but also brings new and more serious problems to power quality due to the wide application of power electronic devices in all walks of life. Damage has become the main source of harmonic pollution in the power grid. The number of rectifiers, frequency converters, electric arc furnaces, electrified railways, and various electric and electronic equipment used in the power distribution network for individual users in the grid system is increasing. Affect or pollute the power grid. Cause voltage instability, overvoltage, harmonic generation, etc. Harmonics reduce the efficiency of power production, transmission and utilization, cause electrical equipment to overheat, generate vibration and noise, age insulation, shorten service life, and even malfunction or burn. Harmonics may also cause local parallel resonance or series resonance of the power system, amplify the harmonic content, and cause the burning of capacitors and other equipment.

The nonlinearity, impact and unbalanced power consumption characteristics of these loads cause serious pollution to the quality of power supply. Therefore, eliminating high-order harmonics in the power supply and distribution system has a very positive significance for improving power quality and ensuring the safe, stable, and economic operation of the power system. On the other hand, the electrical equipment of modern industrial, commercial and residential users is more sensitive to the quality of power, and puts forward higher requirements on the quality of power supply. At present, harmonics, electromagnetic interference and power factor reduction have been listed as the three major public hazards in the power system.

When the power quality of the power grid is disturbed or polluted and fails to meet the relevant national development standards, it is necessary to improve the power quality management of the power grid technology in a targeted manner. To understand the actual working conditions of the power quality of the power grid, it is necessary to have corresponding equipment to analyze the control test data. According to the actual domestic life in our country, our company can timely develop and develop professional power quality analysis instruments suitable for our own national conditions. The following is a detailed description of the specific performance, parameters, and use of this method of the power quality analyzer.