UPQC control system based on time lag compensation and control method thereof

Abstract

The invention discloses a UPQC control system based on time lag compensation and a control method of the UPQC control system. The system further comprises a series transformer, a load, a first filtering module, a second filtering module, a voltage inverter, a current inverter, a harmonic voltage detection module, a UPQC compensation calculation module, a harmonic current detection module, a harmonic prediction neural network module, a three-phase voltage current beat, a three-phase voltage previous beat, three-phase voltage previous n beats, a three-phase current current current beat, a three-phase current previous beat, three-phase current previous n beats, a voltage driving circuit module, a current driving circuit module, a voltage sensor, a current sensor and a shunt transformer. The UPQC system based on time lag compensation has the advantages that the detection precision is high, the detection effect is not influenced by distortion voltage, the time lag of signal extraction can be compensated, and the real-time performance of signal compensation is improved.

Description

technical field [0001] The invention relates to the technical field of micro-grid harmonic control, and discloses a lag error prediction method applied to a unified power quality controller (Unified power quality controller, UPQC) and a harmonic compensation control system thereof. Background technique [0002] UPQC has the advantage of comprehensively compensating voltage swells, sags, and harmonics, as well as current three-phase unbalance, reactive power, and harmonics. At present, UPQC harmonic control generally uses the ip-iq algorithm based on instantaneous reactive power for harmonic signals. Extraction, which has the advantages of high detection accuracy and the detection effect is not affected by the distortion voltage. However, due to the multiple coordinate transformation links in the harmonic extraction process, the extraction of the command signal has a lag of at least one sampling period. The current technology must at least exceed 100μs. The large fluctuation...

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Problems solved by technology

[0002] UPQC has the advantage of comprehensively compensating voltage swells, sags, and harmonics, as well as current three-phase unbalance, reactive power, and harmonics. At present, UPQC harmonic control generally uses the ip-iq algorithm based on instantaneous reactive power for harmonic signals. Extraction, which has the advantages of high detection accuracy and the detection effect is not affected by the distortion voltage. However, due to the multiple coordinate transformation links in the harmonic extraction process, the extraction of the command signal has a lag of at least one sampling period. The current technology must at least exceed 100μs

The large fluctuations of the harmonic current and the fast dynamic response have aggravated the influence of the hysteresis deviation on the accuracy of harmonic compensation

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