Integrated optimization system of electric energy quality of power distribution network

Abstract

Disclosed in the invention is an integrated optimization system of an electric energy quality of a power distribution network. The system is composed of a monitoring server, optimizing devices, and wireless data transmission modules. The optimizing devices consist of three-phase detection modules, reactive power detection modules, harmonic detection modules, and voltage detection modules. The monitoring server includes a three-phase adjustment module, a reactive power compensation module, a harmonic filtering module, and a voltage regulation module. With the system, defects of compensation of the traditional capacitor can be overcome; the electric energy quality and energy conversion application requirements of the power distribution network can be met; and the electric energy quality can be improved substantially. On the basis of the modular design, reactive compensation, harmonic wave filtering, and three-phase unbalance inhibition of all modules can be realized independently or simultaneously; and non-capacity attenuation is realized and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of energy saving and power quality improvement equipment, and in particular relates to a comprehensive optimization system for power quality of distribution networks. Background technique [0002] At present, the reactive power compensation methods of the transmission and distribution network are mostly concentrated on the lines above 10kV, without compensating the reactive power loss of the 10kV line and the 0.4kV to 10kV line transformer, and not compensating the reactive power generated by the user equipment. The reactive power loss generated in the 10kV line and 0.4kV-10kV line occupies a large amount of line transformation equipment capacity, which cannot effectively save energy and improve the voltage quality of the grid. According to statistics, the terminal electrical equipment from power generation, transmission, and distribution to the enterprise grid produces huge line and substation losses of abo...

AI Technical Summary

Problems solved by technology

[0003] Due to the long distance of power supply and the uncertainty of single load in urban and rural distribution networks, distribution voltage transformers are prone to unbalanced three-phase phenomena, resulting in high-load phase conductors, serious heating of transformers, and even burnout. The transmission causes a voltage drop, causing the voltage on the user side to be too low

The power factor of the distribution network system is low due to the load of various household appliances, and a large number of non-linear loads, such as the use of energy-saving household appliances, make the harmonic content in the distribution network system high. At present, harmonic control is basically not considered

[0004] At present, the compensation devices in urban areas and rural distribution networks are mainly group switching capacitor banks, which are prone to overcompensation or undercompensation in the actual process, and the compensation effect is poor; capacitor banks are easy to amplify the harmonics in the system, resulting in increased harmonic loss and Threat to system security; capacitance compensation device does not have the ability to adjust three-phase unbalance; development direction of reactive power flexible compensation and local balance that does not meet the requirements of modern power grids

Due to the obvious peak and valley phenomena of the power load in the distribution network system, frequent switching of the compensation device causes frequent charging and discharging of the capacitor, which affects the life of the capacitor, thereby affecting the life of the compensation device

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