Network construction type energy storage converter pre-synchronization control method based on virtual instantaneous power

• Main Authors: ZHOU LIN, ZHOU XIAOPING, ZHANG LEI, ZHU XIAOHUA, ZHONG ZHENG, YU CHENCHEN
• Format: Patent
• Language: Chinese; English
• Published: 12.05.2023
• 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; 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 virtual instantaneous power-based pre-synchronization control method for a network construction type energy storage converter. The network construction type energy storage converter comprises an energy storage battery, a direct current side capacitor, a three-level inverter, an alternating current filter and a controller, in the grid-connected/off-grid mode switching process of the grid-forming type energy storage converter, virtual instantaneous power is constructed to generate compensation amount of voltage difference between the grid-forming type energy storage converter and an alternating current power grid, and voltage synchronization at two ends of a grid-connected point is ensured, so that the grid-forming type energy storage converter can smoothly switch an operation mode under the condition of no impact current; the invention further provides a non-linear variable integral coefficient control method based on the grid-connected voltage difference, power impact of a pre-synchr