Research on photovoltaic grid-connected inverters with unbalanced load compensation
The increasing global energy crisis and environmental problems have stimulated the rapid development of renewable energy grid-connected technologies such as wind and light.As an important supplement to traditional large-scale centralised wind power stations,the distributed generation technology of renewable energy has attracted widespread attention at home and abroad.As a special distributed power generation system,the microgrid is an important bridge and link between the power grid and renewable energy,which can effectively reduce the impact of renewable energy grid-connected units on the power grid and improve the reliability of power supply and power quality,which is popular favored.However,most grid-connected inverters in the microgrid can only rigidly inject pure sinusoidal fundamental active current into the grid,which exposes many technical limitations and can hardly meet the needs of many emerging technologies.Among them,auxiliary power demand for grid-connected inverters,such as power quality control,autonomous operation,harmonic resonance suppression,etc.,has received the most attention.In this paper,the influence of three-phase unbalance on grid-connected inverters is studied.Based on the photovoltaic system,a three-phase four-wire inverter system structure based on command signal generation is proposed.Through model selection,functional analysis,study of its modulation strategy and establishment of a corresponding simulation model,the working principle of photovoltaic grid-connected inverter system is analyzed in depth.The final simulation results show that the control strategy and modulation method studied in this paper can make PV grid-connected inverters have the function of load imbalance compensation,and effectively compensate for the imbalance produced by composite loads such as pure resistive and harmonic loads.
PV inverter DC microgrid three level
He XIAO Xi ZIQIANG Zhang CHANGZHENG
Hubei Key Laboratory for High-efficiency Utilisation of Solar Energy and Operation Control of Energy Storage System,Hubei University of Technology,Wuhan,430068,P.R.China
国际会议
武汉
英文
238-244
2018-08-21（万方平台首次上网日期，不代表论文的发表时间）