Subsynchronous oscillation suppression method and system based on power grid voltage feedforward decoupling

• Main Authors: QU HUIXING, HUO QIANTAO, LIU XUAN, GUO LIANG, FENG WEI, KONG XIANGMEI, ZHUANG SHENGLUN, SHAO YIXIANG, SUN SUJUAN, SUN LIXIN
• Format: Patent
• Language: Chinese; English
• Published: 18.01.2022
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a subsynchronous oscillation suppression method and system based on power grid voltage feedforward decoupling in the technical field of grid-connected inverter control. The method comprises the following steps: acquiring a d-axis component and a q-axis component of a power grid near-end voltage. According to the invention, the d-axis component and the q-axis component of the near-end voltage of the power grid are used as grid voltage feedforward of grid-connected inverter vector control, so that the problem of subsynchronous oscillation can be effectively suppressed; in original grid-connected vector control, a network voltage feedforward control structure is changed, subsynchronous components in network voltage feedforward are weakened, subsynchronous oscillation generated by coupling of a network voltage feedforward link and all links of vector control is weakened, engineering implementation is easy, and additional cost does not need to be increased; and the method and system can be