Passive filtering type reactive power compensation circuit structure

• Main Authors: LIU QIMING, JIANG GENGHONG, SUN YIFU
• Format: Patent
• Language: English
• Published: 04.03.2015
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; SYSTEMS FOR STORING ELECTRIC ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The utility model discloses a passive filtering type reactive power compensation circuit structure. The compensation circuit comprises a three-phase compensation capacitor group C0 composed of three capacitors in triangle connection, and a split-phase compensation capacitor group C1 composed of three capacitors in star connection. The three input ends of the split-phase compensation capacitor group C1 and the three input ends of the three-phase compensation capacitor group C0 are connected into a star-triangle mixed network. Every three input ends of one or more star-triangle mixed networks are connected in series with a single-phase capacitor C, and then connected in series or in parallel to a series reactor L. The neutral point of the star-shaped network is connected with the center point of the system. The function of harmonic filtering and the function of fundamental reactive power compensation are achieved based on different characteristics of triangle connection and star connection to zero-sequence harmonic components in a three-phase circuit. The circuit structure has the advantages of good asymmetric zero-sequence harmonic filtering effect, capability of effectively reducing the quantity of superposition of zero-sequence harmonics in the center line, no harmonic amplification problem, high universality, and the like.