Soft start operating system and method for parallel energy storage inverter

• Main Authors: SUN YUHONG, PENG HUALIANG, LONG YINGWEN
• Format: Patent
• Language: Chinese; English
• Published: 16.11.2016
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; 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; SYSTEMS FOR STORING ELECTRIC ENERGY; 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 the field of a microgrid, and particularly to a soft start operating system and method for a parallel energy storage inverter. A main inversion unit sends a soft start instruction to a secondary inversion unit according to a frequency signal, an amplitude signal and a phase signal of the output voltage of the main inversion unit; and the secondary inversion unit performs droop control according to the soft start instruction based on the received frequency signal and the amplitude signal to enable the frequency and the amplitude of the output voltage of the secondary inversion unit to be basically the same with that of the output voltage of the main inversion unit. By adoption of the technical scheme, the parallel operation soft start function can be realized in the off-network output of multiple energy storage inverters; the impact to the microgrid load can be lowered; and the parallel operation reliability and the load-bearing ability of the inverter under an island model can be impr