Power control method of grid-forming type photovoltaic inverter

• Main Authors: MENG FANMIN, CHEN XUJU, GAO JUN, CHEN AIYOU, LI KANG, LYU CONG, WANG TAO, WANG QIMING, CHEN ZEWEI, ZHANG PEIJIE, XU XIAOMIN, CHEN LIN, HOU QIUHUA, QIN ZIJIAN, TAN YANCHAO, DING JIFENG, LONG TENGZHOU, LYU DEYONG, XI ZHUQIANG, ZHAO LEI, SUI MINGYANG, QI XIAOYAN
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2024
• 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 provides a power control method of a grid-forming photovoltaic inverter, which comprises the following steps of: measuring grid-connected voltage and current of an inverter side, calculating active and reactive power reference values through a power equation, calculating active power and reactive power of a current system according to an instantaneous power theory, and then adjusting the active power and the reactive power of the system, a voltage amplitude given signal and a phase given value are obtained, the voltage of the virtual impedance and a current inner ring are input, and the current compensation amount is calculated through active reference current compensation and is input into d-axis and q-axis current controllers for compensation modulation for control. According to the method, necessary frequency and voltage support can be well provided for the power distribution network, when the power distribution network breaks down, the method has the network construction capability of indepe