High voltage ride-through control method for double-fed fan after considering power constraint of converter

• Main Authors: CHEN BOJIAN, TIAN XINSHOU, WEI CHUNXIA, TANG BINGJIE, LEI YU, FAN XIAOJIE, HUANG DAOSHAN, LIU HONGZHI, ZHANG QINZHI, WANG YI, LIU CHAO, LIN YAN, SU QINGMEI, XIAO YU, ZHANG HUIYU, SU YUANYUAN, WANG ZHIBING, HU JIANZU, LI YAN, ZHENG GUANGFAN, LIN YIN, LIN FANG, XU ZHENHUA, HUANG TING, XU PENGCHAO, CHI YONGNING, ZHANG XIAOYU, ZHU XUNJUN, TANG HAIYAN
• Format: Patent
• Language: Chinese; English
• Published: 01.11.2019
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention relates to a high voltage ride-through control method for a double-fed fan after considering a power constraint of a converter. When a doubly-fed wind turbine encounters a high voltage of a system, the main control gives control of the wind turbine power to a converter, the controller performs control, and a DC unloading Chopper circuit connected on a DC bus in parallel is input to develop the high-through control; after the high voltage is over, the main control restores control of the wind turbine power. The high voltage ride-through control method solves the problems of DC busvoltage fluctuation and grid side current distortion due to the overvoltage in the transient process, and ensures the safe operation of the wind power system during the fault ride-through. 本发明涉及一种考虑变流器功率约束后双馈风机的高电压穿越控制方法，双馈风电机组遇到系统高压时，主控将对风电机组功率的控制权让出给变流器，变流器开展控制，同时投入并联在直流母线上的直流卸荷Chopper电路开展高穿控制；在高电压结束后主控恢复对风电机组功率的控制权。本发明解决了暂态过程中因为出现过压导致直流母线电压波动、网侧电流畸变等问题，保证了故障穿越期间风电系统的安全运行。