Steady Simulation Research On The AC-DC Power Distribution Network Based On VSC-MTDC Technology

This paper studies the AC and DC distribution network based on voltage source converter MTDC Technology(VSC-MTDC).MTDC can supply with more than one source and accept power in many place,with VSC flow control convenient and flexible features,making VSC-MTDC Technology has become a key technology constitute direct distribution network.The existing distribution network exchange in response to new energy access,and non-public frequency load DC power supply can't meet the terms of the economics and flexibility requirements.Based on DC VSC-MTDC Technology Distribution Network,not only to resolve the current exchange problems faced by distribution network,but also to give full play to the advantages of direct distribution network for the development of intelligent power distribution system is of great significance.First,this paper analyzes the problems faced by the existing urban distribution network and the technical advantages of DC power distribution network.By analyzing the problems in Objective and technical aspects that current urban AC distribution network faces,combined with the technological advantages of DC power supply system,AC and DC distribution network is the most effective solution in the current situation.Then,take a further study on the AC-DC power distribution network Based on VSC-MTDC technology.Study the current system structure and control strategy VSC-MTDC technology,the methods currently used to control the simulation study.Fluctuations traditional PI control system problems occur when large disturbance,we propose a model-free adaptive techniques based on VSC control strategy.VSC system is difficult to solve the power supply for the load imbalance problem,we draw on the power electronic three-phase four-leg inverter structure,proposed a three-phase four-leg inverter side VSC-MTDC system,using space vector control of three-phase four-leg trigger system,successfully solved DC VSC-MTDC constituted power distribution network can't effectively unbalanced load problems.Finally,the model-free adaptive control and VSC bridge stage space voltage vector control valve level set forth above,applied to the feeder node IEEE13 transformation model,built AC and DC distribution network model,using Matlab / Simulink simulation software the validity of model-free adaptive control and VSC bridge stage space voltage vector control valve level and AC-DC power distribution system stability.