UPFC (unified power flow controller) series-parallel converter coordinated control strategy capable of improving voltage supporting strength of alternating-current bus-bar

• Main Authors: ZHU HUAN, CAI HUI, WANG WEIYUAN, XU ZHENG, QI WANCHUN, WANG HAIQIAN, XIE ZHENJIAN, SONG PENGCHENG, WU CHEN
• Format: Patent
• Language: Chinese; English
• Published: 20.10.2017
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The present invention discloses a UPFC (unified power flow controller) series-parallel converter coordinated control strategy capable of improving the voltage supporting strength of an alternating-current bus-bar. According to the UPFC series-parallel converter coordinated control strategy, the amplitude of the voltage of a controlled alternating-current bus-bar during the operation of a power grid is monitored; when the voltage of the alternating-current bus-bar exceeds a limit, characteristic signals which can reflect the limit-exceeding degree of the voltage of the alternating-current bus-bar are calculated; an UPFC series converter reactive power flow command value and a UPFC parallel inverter reactive power command value are automatically adjusted through an alternating-current bus-bar voltage coordinated control algorithm; and UPFC system-level adjustment capacity is utilized to the greatest extent, so that the alternating-current voltage can be controlled to be in a safe and stable operation range. Thu