A comprehensive electric energy quality regulator

Abstract

The invention discloses a synthetic electric-energy quality regulator, comprising series and parallel active filter units, measuring unit and control units, where the parallel active filter unit is connected in series with parallel passive filter unit to compose a parallel unit, which is connected to the system; the series active filter unit is under the control of the series control unit and outputs sinusoidal current by the driving of all the switches of the first inverter unit; the parallel active filter unit is controlled by the parallel control unit and outputs an specific voltage by the driving of all the switches of the second inverter unit; the parallel passive filter unit is a LC filter circuit to provide a low resistance pass for harmonic current of a load and compensate reactive power of the load. The invention overcomes the shortages of large capacity and high manufacturing cost of the original parallel active filter; and has a better tracking effect and a better compensating effect, as well as higher performance / cost trade-off.

Description

technical field [0001] The invention belongs to the field of power system automation, in particular to a high-performance integrated power quality regulator. Background technique [0002] In recent years, the development of power electronic technology has made the non-linear, unbalanced and impact loads such as rectifiers, variable frequency speed control devices, electric arc furnaces, and electrified railways in the distribution network continue to increase. While these loads greatly improve production efficiency, they also bring power quality pollution problems to the power grid, such as harmonics, low power factor, unbalance, and voltage fluctuations and flicker. Unified Power Quality Conditioner (UPQC, also known as Unified Power Quality Controller) can comprehensively compensate for these power quality problems, and it is especially suitable for those who will not only cause power quality pollution to the system, but also greatly affect the power supply voltage change....

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned integrated power quality conditioner has the following problems: ①The parallel active filter withstands a relatively large voltage (equal to the entire load voltage), so the required capacity is relatively large, and it has great technical difficulty, high cost and high equipment operation efficiency in project implementation low level problem

②The series active filter is controlled as a controllable voltage source, and its output reference voltage usually contains certain harmonics, which makes the detection and control system complex and the output tracking effect is not good

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