Local voltage control method based on distributed power supply grid-connected inverter

• Main Authors: SUO JUN, XIA NAN, ZHONG MINGHANG, TONG XIANGQIAN, WANG KAI, LI JUNCHEN, JIN JILIANG, ZHANG XIAOQING, LIU KUNXIONG, LI XIAOTENG, DENG JUN, PENG SHUTAO, ZHANG QINGLEI, HE HANQING
• Format: Patent
• Language: Chinese; English
• Published: 27.07.2018
• 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 discloses a local voltage control method based on a distributed power supply grid-connected inverter. On the basis of a traditional distributed power supply grid-connected inverter control system, a local voltage controller is additionally arranged, and when a valid grid voltage value US is between a set overvoltage value US.up and a set undervoltage value US.low, a reactive power instruction value output by the local voltage controller is zero, that is to say, a distributed power supply works in a unit power factor mode; when the valid grid voltage value US is smaller than the set undervoltage value US.low, the local voltage controller outputs an appropriate capacitive reactive power instruction value, and grid voltage can be raised through the grid-connected inverter; whenthe valid grid voltage value US is larger than the set overvoltage value US.up, the local voltage controller outputs an appropriate inductive reactive power instruction value, and the grid voltage canbe reduced through the gr