Direct grid-connected control method for phase modifier of static frequency converter based on low output voltage

The invention provides a direct grid-connected control method for a phase modifier of a static frequency converter based on low output voltage, which comprises the following steps: by analyzing the amplitude and phase angle relation of stator flux linkage in two states before and after grid connecti...

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Hauptverfasser: WANG QINGBIAO, XU LIANG, ZHANG HAIFENG, LIANG TE, YOON HAE-SEUNG, LI BIN, LIU YUN, LIU SHENG, NIU RONGJIE, HAN ZHUANG, XIE XUELEI, SONG HONGYU, GUO RUI, SUN JIYOU, FU QIANWEN, XIAO JIFENG, WANG MINGHAO, SHU KEXIN, WANG ZIBIN, LIANG HAISHEN, YU QI, LI GUODONG, LV GEN, LIU FENGCHAO, ZONG ZHIKUO, YANG BIAO, GUO HONGMING, YU LU
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention provides a direct grid-connected control method for a phase modifier of a static frequency converter based on low output voltage, which comprises the following steps: by analyzing the amplitude and phase angle relation of stator flux linkage in two states before and after grid connection, a static frequency converter control system sends a blocking pulse signal and a grid-connected contactor closing command, stator current id and iq are quickly attenuated, the stator flux linkage is only composed of if, and the stator flux linkage is only composed of if; and the stator flux linkage is switched from a state before grid connection to a state required by grid connection, so that the terminal voltage amplitude and the phase angle of the synchronous phase modifier quickly reach grid connection conditions. The method can quickly and effectively realize the synchronous grid connection condition of the synchronous phase modifier terminal voltage and the power grid voltage, so as to reduce the impact on