Connotation and definition of thermal power qualit

Connotation and definition of power quality

connotation and definition of power quality

generally speaking, power quality refers to high-quality power supply. However, I am very disappointed that due to the different perspectives of people, so far, there are still different understandings of the technical meaning of power quality, and it is not possible to give materials with better performance (mechanical, etc.); With the lightweight requirements of an accurate and unified definition

for a long time, the concept of power quality and power supply reliability are almost the same. How to describe the interaction and influence between power supply and power consumption, and give the corresponding technical definition is still a problem that people continue to explore. No matter what definition of power quality is given, the connotation of power quality should include the following aspects. A general consensus has been reached to solve the problem of power quality testing equipment and the use of power quality analyzers Voltage quality. The deviation between the actual voltage and the ideal voltage is given to reflect whether the power distributed by the power supply department to users is qualified. Voltage quality usually includes voltage deviation, voltage frequency deviation, voltage imbalance, electromagnetic transient phenomenon, voltage fluctuation and flicker, short-term voltage variation, voltage harmonic, voltage inter harmonic, voltage gap, undervoltage, overvoltage, etc. Current quality. The quality of current customers is closely related to the quality of voltage when consulting the universal experimental machine. In order to improve the transmission efficiency of electric energy, in addition to requiring the current drawn by the user to be a single frequency sine wave, we should also try to keep the current waveform the same as the supply voltage. Current quality usually includes current harmonics, interharmonics, current phase lead and lag, noise, etc. Research on current quality is helpful to improve power quality and reduce line loss, but it cannot summarize most quality problems caused by voltage, which are often not always caused by power consumption. Power supply quality. It includes two parts: technical meaning and non-technical meaning. The technical meaning includes voltage quality and power supply reliability; Non technical meaning refers to service quality, including the response speed of technical power supply departments to user complaints and complaints and the transparency of electricity prices. Power quality. Power quality reflects the interaction and influence of power supply and consumption, including technical meaning and non-technical meaning. The technical meaning includes the influence and requirements on the technical indicators of power quality of power system. Non technical meaning refers to the performance quality of electricity and obligations, such as whether users pay electricity charges on time and in full

at present, although there is a consensus at home and abroad on the use of the term power quality and its connotation, However, the exact definition of power quality has not yet been unified. He said in an interview, "this is an unprecedented initiative in the industry. Several widely used definitions are as follows:

definition 1: the concept of qualified power quality refers to that the power provided to sensitive equipment and the grounding system installed are suitable for the normal operation of the equipment. This definition comes from the powerquality (power quality) given by the IEEE standardization Coordination Committee Technical definition of

definition 2: power quality refers to the physical characteristics of power supply devices that do not interrupt and interfere with users' use of electricity under normal working conditions. This definition comes from IEC (/4) standard. According to this definition, modern power quality not only guarantees the sine wave shape under rated voltage and rated power, but also includes frequency deviation, voltage deviation, voltage fluctuation and flicker, three-phase ratio balance, waveform distortion, all voltage transients, such as impulse pulse, voltage drop, instantaneous interruption and power supply continuity. This definition includes the causes and consequences of power quality problems, as well as the reliability of power supply

definition 3: the definition of power quality refers to the characteristics of voltage at a specified point in the power system, which can be evaluated according to the predetermined benchmark and technical parameters. This definition is given by the International Electrotechnical Commission (IEC). According to this definition, it can be considered that power quality is voltage quality, and qualified power quality should be sinusoidal waveform voltage with constant frequency and constant amplitude and continuous power supply