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Research On Operation Control Strategy Of AC/DC Hybrid Microgrid

Posted on:2017-09-02Degree:MasterType:Thesis
Country:ChinaCandidate:K ZhangFull Text:PDF
GTID:2322330488488124Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
With the energy shortage and environmental pollution problems become increasingly serious,the active development and utilization of new energy and renewable energy has become the consensus of the whole world.Distributed generation converts new energy and renewable energy into electrical power and connects to the distribution network system,which is an effective utilization form of new energy.Microgrid is a small controllable smart power supply and distribution system,which provides technical support for large-scale connection to distribution network of distributed generation and realization efficient utilization of new energy and renewable energy.Distributed generation connect to microgrid system with power electronic equipment,therefore,the control of power electronic equipment and coordinated control of different distributed generations is of significant importance to make full use of transmission flexibility and guarantee the operation stability of microgrid.This paper studies the operation control strategies of microgrid.Firstly,the types and models of distributed generation and the grid connected structure with power electronic equipment are detailed introduced.Virtual synchronous generator control method is designed the inertia and damping of inverters.Active and reactive power control of virtual synchronous generator is introduced.The virtual negative resistance is designed to decouple active and reactive power.The control strategy make that the distributed generations can assume load fluctuation at a certain extent.P-f and Q-du dt improved droop control is introduced,which use voltage change rate as measure index to get reactive power of reasonable and accurate distribution.Combined with this method,an improved droop control method based microgrid optimal distributed coordinated control is proposed to improve the dynamic performance and stability of microgrid.Control strategy of AC/DC bi-directional converter is designed in both grid-connected mode and islanded mode of AC/DC hybrid microgrid to make that the interlinking converter reasonably regulate power allocation between AC side and DC side of hybrid microgrid.DC side control strategy is introduced and corresponding controller of distributed generation is designed.The whole control can realize the coordinated and stable operation of AC/DC hybrid microgrid.
Keywords/Search Tags:Microgrid, operation control, virtual synchronous generator, distributed coordinated control, AC/DC hybrid microgrid control
PDF Full Text Request
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