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Research On Control Strategy Of Microgrid Inverter Based On Virtual Impedance Active Power/voltage Change Rate Droop Control

Posted on:2018-06-27Degree:MasterType:Thesis
Country:ChinaCandidate:Z S SongFull Text:PDF
GTID:2322330533463190Subject:Power electronics and electric drive
Abstract/Summary:PDF Full Text Request
With the large consumption of disposable energy and the adverse impact on the environment and climate,the call for the use of clean energy is becoming increasingly high,and the most effective way to use clean energy is distributed power generation,To the problem,many scholars put forward the concept of micro-network.The microgrid can avoid the series of problems caused by the distributed power generation unit,and the microgrid can improve the system stability and energy utilization rate.As an important part of the energy conversion,the control strategy of the inverter is safe and stable.Research has a very important significance.First of all,this paper analyzes the development of microgrid and its common control strategy,and introduces the droop control,and analyzes the traditional droop control in the line impedance inconsistency,will cause the inverter power inequality,There is a circulation between the converters.In order to improve the impedance of the inverter,the active power of the inverter can not be evenly divided.In this paper,the P-(?) droop control method is proposed by introducing the dynamic relationship between the output power and the output voltage of the inverter.Where V(5)represents the rate of change of the output voltage amplitude.Compared with the traditional droop control P-(?) droop control has a great improvement effect on the power distribution of the parallel system,and the voltage recovery mechanism also ensures the stability of the inverter output voltage.Although the P-(?) droop control improves the power distribution,but still can not achieve the inverter power equalization,so this paper proposed based on the virtual impedance P-(?) droop control,the method can not only achieve full power equalization,but also make the virtual impedance caused by voltage drop The In order to verify the correctness of the method In this paper,the simulation model of microgrid is established in MATLAB/simulink software environment,and the control method is simulated.Finally,a DSP control experimental platform composing of two three-phase inverters is constructed,and the control strategy is verified by experiments.The experimentalresults show that the control strategy used in this paper can not only achieve a reasonable distribution of power,but also can lift the inverter voltage.
Keywords/Search Tags:Micro grid, virtual impedance, power allocation, droop control
PDF Full Text Request
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