Analysis of microgrid inverter paralleling system based on virtual oscillator

作者：Tu, Yong; Su, Jianhui; Du, Yan; Yang, Xiangzhen; Xu, Huadian

来源：Electric Power Automation Equipment, 2017, 37(9): 24-30.

DOI：10.16081/j.issn.1006-6047.2017.09.004

• Circulating current suppressions
• Digital controllers
• Micro grid
• Microgrid inverters
• Parallel
• Resonance parameters
• Second-order systemss
• Synchronization models

The paralleling control of microgrid inverter with VOS(Virtual OScillator) is modeled and its stability is analyzed. The inverter paralleling under VOS control in islanded microgrid is equal to the paralleling of VOS controller itself and the VOS controller is a digital controller by programming. The effect of system circulating current suppression is influenced by the resonance parameters and EXS(EXcitation Source) function. The second-order system transfer function is given, the equivalent paralleling synchronization model of VOS controller is established, and its stability and conditions are analyzed. As the load impedance variation may affect the output stability of parallel inverter, the EXS model is designed based on the power sharing state to compensate the load current disturbance for improving the quality of output voltage. Simulative results verify the feasibility of the proposed control method.

• 出版日期2017
• 单位合肥工业大学