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Electric energy is an extremely important energy source for the national economy and people's lives. As a special commodity provided by the power sector to users, the quality of which is guaranteed by the three aspects of power generation, power supply and electricity consumption. Its quality has attracted more and more attention. Technical governance and control of power quality is an effective method to improve power quality and a necessary condition for high-quality power supply and consumption. However, power quality is dynamic, relevant, disseminating, complex and other characteristics, and the control and improvement of power quality is not a one-stop process. A breeze. In order to ensure the effective control of power quality, this article analyzes and discusses methods to improve power quality from the technical perspective of total quality management of power quality, strives to meet the design requirements and goals of power quality, and shares it with peers.
Overview of power quality control analysis
. Metrics of power quality
The meaning surrounding power quality Metrics of power quality usually include the following aspects:
( ) Voltage quality
/> Refers to the deviation between the actual voltage and the ideal voltage to reflect whether the electric energy supplied by the power supply enterprise to users is qualified. The deviation here should be broad and includes amplitude, waveform, phase, etc. This definition includes most power quality problems but does not include power quality problems caused by frequency or the impact and pollution of electrical equipment on the power quality of the grid.
( ) Current quality
Reflects changes in current that are closely related to voltage quality. In addition to the constant frequency and sinusoidal waveform requirements for AC power, power users also require that the current waveform and the voltage be in the same phase to ensure high Power factor operation. This definition helps improve the power quality of the power grid and reduce line losses but cannot summarize most quality problems caused by voltage.
Other indicators include power supply quality, power consumption quality, etc. These indicators jointly reflect the quality of the electric energy produced and transmitted by the power system, and electric energy can be managed based on these indicators.
. Factors affecting power quality
( ) Changes in power load composition
Currently there are a large number of non-linear loads in the power system, large-scale power electronic application devices (energy-saving devices, frequency conversion equipment, etc.) and high power Electric drive equipment, DC output devices, electrochemical industrial equipment (rectifiers for chemical and metallurgical enterprises), electrified railways, steelmaking electric arc furnaces (AC, DC), rolling mills, hoists, calcium carbide machines, induction heating furnaces and other non-linear load.
( ) A large number of harmonics are injected into the power grid
New power equipment containing non-linear and impact loads will inevitably produce non-sinusoidal waveform currents and inject harmonic currents into the power grid while achieving power control and processing. The voltage waveform at the common connection point ( ) is severely distorted. The load fluctuation and impact cause various power quality disturbances such as voltage fluctuations and instantaneous pulses.
( ) Automatic protection and normal operation of power equipment and devices
The impact on power quality caused by the start-up and shutdown of large-scale power equipment, the tripping and re-closing of automatic switches, etc. can temporarily reduce the rated voltage and cause voltage fluctuations. Flicker will also have an impact on power quality.
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