Two-stage photovoltaic system sequence impedance modeling method, device, equipment and medium

• Main Authors: ZHUANG KAIXUN, PAN XING, XU QUNWEI, HUANG XIAOMING, JIANG WENDONG, ZHAO ZHENG, ZHA LEI, LI PEI, LU CHENGYU, ZHA XIAOMING, HU ZHUN, MA ZHIQUAN, ZHU FEIBAI, XIONG HONGTAO, WANG SONG, SUN JIANJUN, ZHANG CHI, SUNG KYUNG-JOO, HUANG HONGYANG
• Format: Patent
• Language: Chinese; English
• Published: 13.10.2023
• 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; CALCULATING; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; COMPUTING; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; GENERATION; PHYSICS; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a photovoltaic system sequence impedance modeling method, which relates to the technical field of power electronic converters and is used for solving the problem that the characteristic description of an existing impedance model is incomplete, and the method comprises the following steps: assuming positive and negative sequence disturbance voltages at a common coupling point; according to a two-stage photovoltaic system circuit structure, coordinate transformation, a first-stage control link and a second-stage control link, positive sequence response current and negative sequence response current are obtained through calculation, the first-stage control link is a DC/DC link, and the second-stage control link is a DC/AC link; dividing the disturbance voltage by the response current to obtain an impedance model; and simulating the impedance model, and verifying the precision of the impedance model. The invention further discloses a photovoltaic system sequence impedance modeling device,