Hybrid energy storage-containing photovoltaic DC micro-grid coordinated control method

• Main Authors: BAO ZHIYANG, LIU DAOBING
• Format: Patent
• Language: Chinese; English
• Published: 23.11.2021
• 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; CONTROLLING; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES; SYSTEMS FOR STORING ELECTRIC ENERGY

A hybrid energy storage-containing photovoltaic DC micro-grid coordinated control method comprises the following steps of: establishing a control strategy of a photovoltaic power generation system, and enabling the photovoltaic power generation system to operate in an MPPT mode and a CVC mode; dividing the operation mode of a DC micro-grid into a plurality of working modes; establishing a low-pass filter model to distribute power borne by a hybrid energy storage system; calculating the working currents of a super-capacitor and a storage battery according to the power and terminal voltage borne by the super-capacitor and the storage battery respectively; designing the control mode of a bidirectional DC/DC converter by comparing the charging and discharging current reference value of an energy storage device with the actual working current; and when the photovoltaic power generation system and the energy storage device in the DC micro-grid are not enough to stabilize power fluctuation in the system, or the ener