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Research On Optimal Power Flow Of AC/DC Distribution System With Electric Vehicles

Posted on:2016-11-23Degree:MasterType:Thesis
Country:ChinaCandidate:X L YuFull Text:PDF
GTID:2322330470475643Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
With the development of power electronics technology, based on voltage source converter HVDC technology(VSC-HVDC) shows tremendous potential in the distribution field. DC power distribution network can solve power quality issues of distribution network with lots of advantages, like high capacity, low-cost of line,small consumption, no reactive power compensation and environmental benefits;and it' also easier for the generation of DG and DC load with reducing system costs and improving flexibility and efficiency. At the same time, with the ever-increasing exhaustion of fossil fuels, renewable energy and electric vehicles are gradually rising. EVs as energy storage units are receiving more and more attention, but a growing number of EVs generated to the distribution network will run pose serious challenges. To solve this problem, considering the high cost and low feasibility of the DC distribution network construction, this paper presents an AC/DC mixed distribution network model based VSC-MTDC, and then reseach the power flow and optimization problem of AC/DC power distribution system with EVs, which will have a great significance on the safety, reliable and stable operation of the future AC/DC distribution network. The paper's main researches are as follows:1. The factors related to charging power of EVs are first analyzed and based on Monte Carlo simulation method the EVs' charging and discharging cluster model is established. In MATLAB platform, the future of EVs' charging and discharging load is predicted. By calculating the charging and discharging load, the result shows that EVs as the storage units has load shifting role.2. On the basis of steady-state model of VSC-HVDC, considering the reactors,filters, and converter losses, the back/forward alternate iteration algorithm which is applied to power flow calculation of AC/DC distribution system including VSC-MTDC is proposed. After modified the IEEE Standard example, the basic flow calculation verifies the efficiency and validity of the model and algorithm; and the effects of the EVs' genetated location and capacity are further studied.3. Considering the EVs' energy dispatching strategy, a multi-objective function with minimizing the system operating costs and minimizing network losses is established. Based on the improved multi-objective particle swarm algorithm, the positive effects on the economy and safety operation of AC/DC power distribution grid are verified with EVs' generation.
Keywords/Search Tags:Electric Vehicles, Cluster Model, VSC-MTDC, AC/DC Distribution System, Optimal Power Flow
PDF Full Text Request
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