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Study On Energy Scheduling And Coordinated Control Strategy Of Dc Microgrid Cluster

Posted on:2021-01-28Degree:MasterType:Thesis
Country:ChinaCandidate:H T ShiFull Text:PDF
GTID:2392330611953454Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
As the main trend of new energy cluster in the future,the dynamic energy scheduling of micro-grid cluster has been a hot topic.DC micro-grid cluster of system aiming at solving scheduling problem of coordinated control and Energy and put forward a kind of Energy Exchange Unit DC micro-grid cluster topology,the topology of the EU to provide multiple sub-nets as well as the Energy storage system and interface,on the basis of sub-net and group of bus bar voltage micro-grid cluster of working voltage can be divided into three layers,corresponding to three kinds of working mode put forward the corresponding control algorithms for coordinated scheduling piconets group of Energy,at the same time,each modulein the stability of DC bus voltage.The details are as follows:In this paper,a micro-grid cluster system topology based on EU is proposed,based on the EU topology for the micro-grid cluster at the same time,puts forward a micro-grid cluster of DAB hierarchical control strategy,the control mode on the basis of sub-net of the DC bus voltage DC micro-grid cluster of running mode can be divided into three layers,when the sub-net DC bus voltage is too high,the sub-net output sub-net excess load demand,excess energy by EU unit to the storage charge,subnet in stable droop control sub-net bus-bar voltage balance;When the sub-net DC bus voltage is too low,the sub-net output is not enough to maintain the load operation.The photo-voltaic unit works in MPPT mode.Meanwhile,the energy storage system makes energy supplement to the sub-net through EU to maintain the DC bus voltage balance.When the subnet is in normal operation,the sub-net DC bus voltage fluctuates within the allowable range,and the photo-voltaic unit works in MPPT mode,and the energy storage does not participate in the regulation.The experiments and simulations show that the sub-net can effectively switch out of cluster smoothly and the bus voltage can be effectively controlled under the three working modes.The simulation and experiment verify that the DC microgrid can realize the stable operation and smooth switching among the three working modes under the layered control.In order to ensure the normal operation of the energy storage mode,reasonable arrangement of charge and discharge is of vital importance.In this paper,the power distribution of the energy storage system is studied under two conditions of charge and discharge.Reasonable arrangement of charge and discharge ratio of the energy storage unit can avoid excessive charge and discharge and reduce the impact on battery life.In order to solve the problem of DC bus voltage fluctuation in the energy storage system,the measured DC bus voltage is compared with the reference voltage,and the total compensation power required by the energy storage system is obtained through the voltage PI controller,so as to complete the compensation for the energy storage power.At the same time this paper system detail microgrid cluster of large-scale electric vehicle caused by mismatch between supply and demand of DC micro network scheduling problem,the cluster of coordinated control system and energy as well as electric cars in microgrid cluster to participate in the energy efficiency of scheduling problems in the system,for electric cars and distributed energy random feature modeling,scheduling cost minimum as objective function to build the network of economic operation model,use the priority algorithm,for electric cars in order and disorder to charge and discharge under the two strategies optimization,get two strategies under different micro source output characteristic curve,to obtain the optimal dispatching of power.
Keywords/Search Tags:DC microgrid cluster, energy exchange unit, energy storage system, energy regulation, Orderly charge
PDF Full Text Request
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