A line power compensation system based on energy storage and AC voltage regulation control

Abstract

The invention discloses a line electric energy compensation system based on energy storage and alternating-current voltage regulation control. The system comprises an alternating-current voltage regulation unit, a compensation transformer, an energy storage and conversion unit, a novel SVG unit and a sensing detection unit. The alternating-current voltage regulating unit generates compensation voltage through alternating-current voltage regulating closed-loop control; the compensation transformer couples the compensation voltage to a power supply line to realize voltage compensation; the energy storage and conversion unit realizes power grid load peak-valley adjustment and supplies an energy source required by a voltage compensation process through the alternation of a charging mode and adischarging mode. The novel SVG unit effectively eliminates and weakens harmonic waves generated when voltage compensation is carried out in an alternating current voltage regulation mode, and meanwhile, the reactive compensation and three-phase imbalance compensation of a line are achieved. The power supply problems of large voltage drop, large line loss and the like in a load dispersion area areeffectively solved, and the power supply quality can be comprehensively improved.

Description

technical field [0001] The invention relates to the field of power supply or power distribution, in particular to a line power compensation system based on energy storage and AC voltage regulation control. Background technique [0002] Electric energy is an industry closely related to the national economy, and ensuring good power quality is the fundamental requirement for power grid construction. For some areas with low population density and scattered loads, such as high-altitude areas such as Guoluo Prefecture in Qinghai Province, the construction of transmission and distribution networks is even more backward. In the distribution network, there are generally problems such as long power supply radius, unqualified line voltage, and frequent voltage drops. Moreover, there are few high-performance advanced equipment that have been put into use to improve the voltage quality of the distribution network and the effect is not good, which affects Improve the quality of life of t...

AI Technical Summary

Problems solved by technology

In the existing technology, flexible AC transmission technology can significantly improve the utilization efficiency of transmission lines in the transmission network, promote the realization of long-distance, large-capacity, and high-efficiency transmission of power, and with the rapid development of power electronics technology, controllable series-parallel compensation It has become a hotspot in the field of research and application. Based on the principle of active compensation, these devices inject amplitude and phase-controllable current and voltage into the grid to achieve large-capacity compensation, but their DC side energy sources still limit their large-scale applications. The key issue

Images