UPQC control method and device based on coordinated power allocation

Abstract

The invention provides a UPQC control method and device based on coordinated power allocation. The invention first proposes a UPQC power control strategy based on the principle of capacity equalization, so that series and parallel converters share the load power equally, thereby giving full play to the series converter. At the same time, considering that when the voltage of a power supply drops too much, an active circulating current of a system increases, thereby increasing the capacity load and loss of the series and parallel converters, the invention further proposes a UPQC power control strategy based on reactive compensation in the case where the voltage of the power supply drops too much, a compensation voltage phasor of the series converter is controlled to be always perpendicular to a power supply current phasor so that the series converter only emits reactive power, the parallel converter absorbs energy from a DC side energy storage unit and shares the load active power with the power supply, the purpose of eliminating the active circulating current is thus achieved, and at this time, the reactive power output by the series and parallel converters still follows the principle of equalization.

Description

technical field [0001] The invention belongs to the technical field of unified power quality regulator (UPQC) power control, and in particular relates to a UPQC control method and device based on coordinated power distribution. Background technique [0002] With the access of distributed power sources and the development of power electronics technology, the power source and load structure of modern power distribution systems have undergone major changes. On the one hand, a large number of distributed power sources connected to the distribution network cause various power quality problems such as voltage fluctuations and voltage sags; on the other hand, some nonlinear and impact loads cause serious interference and pollution to the power quality of power supply. In order to solve the increasingly serious problem of power quality in the distribution network, in recent years, the user's power technology, which is based on high-tech technologies such as power electronics technol...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a UPQC control method and device based on coordinated power distribution, which is used to solve the problem that in the existing method, when the power supply voltage drops too much, the increase of the active circulation of the system affects the stable operation of the system

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