Unbalanced voltage control method based on virtual synchronous generator

• Main Authors: SUN KESHUAI, ZHANG YUNFEI, XUE BING, YIN CONGCONG, WU BIN, YANG XUHONG
• Format: Patent
• Language: Chinese; English
• Published: 15.09.2017
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ONOTHER TECHNOLOGY AREAS; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; SYSTEMS FOR STORING ELECTRIC ENERGY; SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORKOPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FORIMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION,DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention relates to an unbalanced voltage control method based on a virtual synchronous generator. A balance voltage control method is provided for an L-shaped filter under the offline condition based on the virtual synchronous generator. According to the method, a negative sequence voltage control strategy is put forward on the basis of the original virtual synchronous generator control method. Compared with the present offline unbalanced voltage control method, control of the unbalanced voltage under the grid unbalanced state is solved by adopting the voltage positive and negative sequence separation method so that the unbalanced voltage can be rapidly and effectively suppressed and the power grid is enabled to recover the balance state. The control method has the advantages of high control accuracy and fast response speed so as to be popularized to the control method of other single-phase or three-phase grid-connected inverters. 本发明涉及种基于虚拟同步发电机的不平衡电压控制方法，在虚拟同步发电机的基础上，在离网条件下对L型滤波器提供种平衡电压控制方法，该方法在原有虚拟同步