Double-tuned filter based on controllable electric reactor

• Main Authors: LIU FENGZHEN, LIU LIZHONG, XIANG GUANGYONG, WEI XING
• Format: Patent
• Language: English
• Published: 01.04.2015
• 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 double-tuned filter based on a controllable electric reactor, and belongs to the field of reactive compensation and harmonic suppression devices in the electric power system. The double-tuned filter based on a controllable electric reactor is composed of a capacitor C1, a controllable electric reactor L1, a capacitor C2 and an electric reactor L2, a double-tuned filter, and a control circuit of the controllable electric reactor; the capacitor C1, the controllable electric reactor L1, an electric reactor L0, and a parallel branch of the capacitor C2 and the electric reactor L2 are connected in series in turn; and the double-tuned filter is connected in parallel at a side of the system. According to the double-tuned filter based on the controllable electric reactor, an output reactance value of the electric reactor is changed by changing a direct-current control voltage of the controllable electric reactor, parameters of the filter can change in real time according to changes of system parameters, and the filter thus can maintain resonance oscillation all the time and thus maintain excellent filter effects. Influences of detuning caused by system frequency deviation, temperature drift, filter capacitor aging and nonlinear load variation of conventional passive filters are eliminated. Meanwhile, the capacitors in the double-tuned filter based on the controllable electric reactor can perform user reactive compensation, and thus a power factor is raised.