Research On The Control Of Distributed-Integrated-Energy-System Power Quality In Grid Connected Mode And Island Mode

The distributed integrated energy system can enhance the reliability of local power supply,and its internal power quality is guaranteed by the inverter devices of each distributed power source.Therefore,reasonable and effective inverter control technology is of great significance to improve the power quality level of the distributed integrated energy system and promote the development of the distributed integrated energy system.This article first gives a brief overview of the power quality of the distributed integrated energy system,and introduces the common distributed power sources and the power quality problems that easily occur in the structure of the distributed integrated energy system.Next,the traditional active and reactive power(P/Q)control strategy is introduced in the grid-connected mode.Based on the analysis of the advantages and disadvantages of the traditional active and reactive power control strategy,an improved P/Q control strategy based on the remaining capacity of the inverter is proposed.On the basis of ensuring the grid-connected transmission of active power,the design capacity of the inverter is fully and effectively utilized,which greatly improves the energy utilization efficiency,reduces the design capacity of the additional SVG or APF of the system,and reduces the manufacturing and construction of the distributed integrated energy system cost.Then in the islanding mode,the commonly used voltage frequency(V-F)control and voltage droop(Droop)control are introduced,and the three commonly used operating modes of the islanding mode are briefly introduced,and an improved VF control strategy suitable for the islanding mode is proposed.Effectively suppress the qualitative interference caused by sudden load switching in the distributed integrated energy system,and provide technical guarantee for the high power quality and stable operation of the distributed integrated energy system.Finally,the aforementioned strategies are simulated and modeled in the MATLAB/Simulink environment,the whole process of modeling is introduced in detail,the full simulation of various working conditions is carried out,and the proposed new control strategy is simulated and verified.The proposed strategy is effective in improving the power quality under the grid-connected and island mode of the distributed integrated energy system.