Improved virtual generator control method for direct current micro-grid

• Main Authors: HU WANGBAO, YU CHUNLAI, GUO HAOHAO, ZHANG QINJIN, LIU YANCHENG, ZHANG HANWEN, QU TENGDA, WANG HONGLAI
• Format: Patent
• Language: Chinese; English
• Published: 10.08.2021
• 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 provides an improved virtual generator control method for a direct current micro-grid. According to the method, an average current PI controller is combined with a virtual direct-current generator, accurate distribution of the current is achieved while the inertia and damping of the system are improved, traditional droop control does not need to be introduced, and then the problem of secondary drop of the bus voltage caused by droop control is avoided. Meanwhile, in allusion to the problem of poor control dynamic characteristics of the traditional virtual motor, a self-adaptive adjustment equation of an inertia coefficient and a damping coefficient is designed, and the dynamic characteristics of the system are improved. According to the method, the line impedance of each converter unit is considered, the method can be applied to the multi-source parallel DC micro-grid, all controllers and calculation are completed locally, and the current sharing speed is high. 本发明提供一种用于直流微电网的改进虚拟发电机控制方法。本发明通过将平