Fault ride-through method and system for asymmetric power grid of doubly-fed wind turbine generator

• Main Authors: LI ZHEN, PINJIA ZHANG, GU JIATENG, ZHANG ZHENBIN, ZHANG YONGFENG
• Format: Patent
• Language: Chinese; English
• Published: 02.01.2024
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

According to the asymmetric power grid fault ride-through method and system for the doubly-fed wind turbine generator, a rotor negative-sequence q-axis current reference value, a rotor positive-sequence q-axis current reference value and a grid-side converter negative-sequence q-axis current reference value are set on the basis of the targets needing to be met, the direct-current bus voltage limitation of a doubly-fed wind power converter is overcome, and the fault ride-through effect of the doubly-fed wind turbine generator is improved. And during a serious asymmetric power grid fault period, dynamic reactive current support is provided for the power grid while the double-fed wind turbine generator is ensured not to be off the grid, so that the requirement of the newest wind power grid connection guide rule on positive and negative sequence reactive current support is met. 本发明提出了一种双馈风电机组不对称电网故障穿越方法及系统，对转子负序q轴电流参考值、转子正序q轴电流参考值和网侧变换器负序q轴电流参考值，基于所需满足的目标进行设置，克服了双馈风电变换器直流母线电压限制，严重不对称电网故障期间，保证双馈风电机组在不脱网的同时，向电网提供动态