Harmonics refer to the amount of electricity contained in a current with a frequency that is an integer multiple of the fundamental frequency. Generally, it refers to the Fourier series decomposition of periodic non sinusoidal electricity. In addition to the electricity at the fundamental frequency, the electricity at currents with frequencies greater than the fundamental frequency is called harmonics.The harmonic frequency is the ratio of the harmonic frequency to the fundamental frequency....

Power grid shaking refers to the phenomenon of significant voltage fluctuations or short-term power outages that occur during the operation of the power system due to lightning strikes, short circuits to ground, fault reclosing, backup automatic switching, external and internal power grid failures of the enterprise, and the start-up of large equipment.

With the rapid development of modern power industry and significant changes in the power load structure of the system, the dependence of factories and office automation on electronic equipment is growing rapidly. For power users, voltage sag is becoming a major issue. During the whole process of power generation and use, it must span a wide geographical area, where the entire transmission system generally encounters lightning, rainstorm, gale, construction, personnel misoperation and other accidents, which cause voltage sag caused by short circuit fault, some of which are enough to affect the normal operation of sensitive equipment....

Voltage fluctuation refers to the periodic changes in voltage amplitude or power frequency voltage envelope within a certain range, or a series of random changes in voltage amplitude not exceeding 0.9-1.1 (p.u.); The voltage fluctuation value is the percentage of the difference between the maximum and minimum root mean square values of the voltage relative to the rated voltage. Voltage fluctuations cause fluctuations in the illuminance of lighting fixtures....

Reactive power is the electrical power used for the exchange of electric and magnetic fields within a circuit, and for establishing and maintaining a magnetic field in electrical equipment. It does not perform external work, but is converted into other forms of energy. Any electrical equipment with electromagnetic coils that establishes a magnetic field requires the consumption of reactive power. Reactive power does not do any work, but to ensure the conduction of active power, it must first meet the reactive power of the power grid....

harmonicIt refers to the amount of electricity contained in the current with a frequency that is an integer multiple of the fundamental frequency. Generally, it refers to the Fourier series decomposition of periodic non sinusoidal electricity. Except for the electricity at the fundamental frequency, the electricity generated by currents greater than the fundamental frequency is called harmonics. The harmonic frequency is the ratio of the harmonic frequency to the fundamental frequency (n=fn/f1)....