Research on Harmonic Problem of Micro-grid with Distributed Grid Connected Inverter

Abstract

With the grid connected inverter is widely used in the new energy power generation, which is represented by wind energy and photovoltaic power generation, the resonance problem caused by the grid connected inverter becomes more and more a threat to the safe and stable operation of power system. This paper firstly introduces the basic structure of the new energy grid connected system, which is represented by wind power and photovoltaic system. Secondly, the harmonic resonance of the new energy grid connected system is analyzed. Finally, this paper introduces the optimization operation control process of the multi-function grid connected inverter, and proposes a power quality and reliability management strategy based on summarizing the advantages and disadvantages of various methods. 2. Grid-Connected Mechanism of Distributed Inverter System Grid-connected inverter is the core component of the grid-connected system. According to the type of DC-side power supply, can be divided into voltage source and current source inverter. In the distributed power generation system, the working mode of the grid-connected inverter can be divided into grid-connected mode and island mode [6]. Inverter output filter is the role of power electronic switching devices to produce high-order harmonic filter, in addition to isolation and energy storage auxiliary function. At present, the grid-type inverter filter types are L-type, LC type, LCL type, LLCL type [7].

Validation of FCS-MPC control strategy based on CHIL

“…Wind power generation needs to be rectified and then inverted, while photovoltaic power generation only needs to be inverted and finally both are then connected to the grid. Inverter is very important for new energy generation [4]. With the rapid development of power electronics and the increasing power of signal processors like DSP, more and more researchers have studied model predictive control.…”