Stability Analysis of DC Distribution System

constancy Analysis of DC Distribution SystemStability Analysis of DC Distribution System with Constant Multiple Power Loads Ethics Declaration Checklist (to be completed by student)Does this throw up involve the use ofYES/NOHuman participants,NOPreviously collected confidential data,NOAnimals for scientific purposes?NOIf YES to every of the above, then the proposal forgeting not be sancti matchlessd and you will not be allowed to proceed with this estimate.By submitting this report through the unit website for assessment, you certify that the information provided above is true and correct.AbstractIn new-fashi wizd times dc distribution ashes is become a very complex which consist different types of multiple advocator converters. But strategy is suffered from constancy related problem which arise ascribable to negative incremental resistivity of constant power loads. There ar several methods for stability depth psychology of dc distribution establishment such as Middelbr ook criterion, phase and gain margin criterion, energy source consortium criterion and the Passivity- Based stability criterion (PBSC). Furthermore, one anformer(a) technique which name is unequivocal Feed-Forward control which is used with PBSC to improve the stability and to solve the placement interaction problem. The main aim of the project is to tilt whole system into simulation personal manner in MATLAB and try to make the system persistent.IntroductionNow day dc distribution systems are broadly speaking ground on the power electronics Which used power converter and semiconductor devices. As a result stability and dynamic performance developed out-of-pocket to converter interconnection system. As we mentioned above there are most of criterion lot be used only for single bus system. However, the power electronics ground system consist multiple converter and multibus system so for this complex scenario the most reliable and accurate technique is the Passive Based Sta bility Critrion (PBSC). In this technique, stability of the any(prenominal) system may be derived by evaluating the system bus resistivity. (Siegers, Arrua and Santi, 2017)Furthermore, in PBSC technique the system may be stable if the bus resistivity of the system is analysed as a passive therefore this system also need to couple with positive feed-forward technique which is used to objective stabilizing controllers that force the system bus passivity by damping impedances. The main concept of dynamic performance is based on impedance region of the system so suitable damping impedance can be developed or calculated in the system employ the PFF control.Fig1.0 multi-bus system with power convertersMotivationIn recent time, to work with dc distribution system becomes very easier because of developed semiconductor technology and power electronics converters. In power system network broadly stability of any system is very import if it is dc or ac distribution. Power quality is gene rally related to potentiality quality of the system. At this stage, the main tendency is to change ac distribution system with high level dc distribution system. There are several technique are available for stability analysis of dc distribution system but the impedance based stability criterion such as PBSC is widely used. When any system is connected with the constant power load then it may be suffer from asymmetry because it causes to increase the current. As a result it will definitely decrease the voltage. (Hodge Flower, 2009).In addition, PBSC is recently developed stability analysis technique which is exhibit better stability margins and establishes certain performance. Furthermore, this technique is power electronics based so it may consist of multiple power converters. There is one basic architecture model is given in fig 1.0. This technique is today applied to several net full treatment such as automotive power system, telecommunication system, electric- ship and elect ric- aircraft, as well as electric and hybrid- electric vehicles. (Siegers, 2017).Moreover, firstly PBSC technique could be apply only to single bus system which consist of source and load converter. But after dynamic closed loop answer of the converters is establish using standard resistively intermediate converter which is used to limit the analysis of single bus system. In general, the multi-bus power converter system has n numbers of buses and also has large number of shift converters, sources and loads. Multi-bus system is evaluated to an equivalent network (n-Port) to each bus. Mostly, passive based stability criterion is developed in frequency domain.ObjectivesThe main objective of this project is how DC distribution system should be become stable during constant power load using PBSC technique. PBSC is one of the different techniques which can be used for both single and multiple bus system so it will be helpful to understand the switching system of converter.Need to analy sis of criteria for the stability of dc distribution system.To create the circuit of dc distribution using switching converter for different plosive consonant system such as open loop, feed forward input control.Create the matrix diagram and its calculation of transfer function.To run whole DC distribution model in simulation mode in MATLAB.To compare and analysis of the actual calculation and simulation result for stability.SignificanceThe main logical implication of this method is that system may be stable if the network is passive. PSBC is mostly used for multi-bus system so it has n number of load converter and m number of source converter. Therefore, in the first place two criteria for system stable which related to total equivalent impedance.Z(bus) has no poles on right half plane(RHP)ReZ(bus(jw) =0 or Z(jw) has a contour of Nyquist which is lies totally in the RHP.The main goal of the technique is to make system stable. So, positive feed- forward control (PFF) is using dam ping impedance in parallel with the existing impedance. The main reason of using damping impedance is to stabilize the DC bus voltage by changing the bus impedance in the frequency domain. Furthermore, there are mainly three types of parallel damping cases such as Capacitor parallel damping, R-C parallel damping and L-R-C parallel damping.Proposed ApproachThe project work can be divided into a number of delegates that lead to complete work sequentially and successfully for achieving the main objective. There are mainly four task that need to be done such as research or understand the DC system, Principle of PBSC technique and how it is different from the other stability technique, matrix analysis and mathematical approach and finally to establish dc distribution model in simulation mode in MATLAB.In the first task, it is necessary to understand the basic principle of dc system such as how dc system works and why dc system becomes unstable in certain condition. Furthermore, PBSC is the main part of this project so it is necessary to understand other stable system first then how PBSC can be different technique than other for example these only one system which can be used for multi-bus system. In addition, the main role is that it works with switching converter because dc system can work only in resistive part but due to switching approach in time domain analysis it can work with inductive and capacitive part.The third part is to establish mathematical model or calculation of any system by using matrix formation. It will give the actual value of impedance for stability of system because whole method is depends on impedance of the system. Finally, the last part of this project is very important. It is necessary to understand the MATLAB software and then apply simulation mode for DC grid system.TimelineOne set apart chart is given in the appendix which shows the whole timeline of the project. In the first semester, project is divided into 13 weeks excluding holi days and exams. The description and time is also given in the grant chart. Furthermore, for semester 2 dates and description is not fixed but given approximate nearly. During the project, it may come some error and difficulties then some changes will occur. Each task is given sequentially and it may help to complete the whole task in given period.Risk AssessmentThere is some other(prenominal) attachment is given in appendix which shows the risk of the project. In general, the risk of the project is very low because mostly work in simulation mode not in the real world. There are several factors which can be affecting on the project such as supervisor, health, personal, software, equipment and computer. All factors are defined by code which is given below.SUP- SupervisorPer- PersonalHLTH- healthEQU- equipmentCMP- computerSFT- softwareAs mentioned above the overall risk of this project is low. more or less risk factors are near to zero such as supervisor, personal. The health risk al so low but sometimes it is dangerous for eyes due to sitting in front of computer but it can be overcome wearing the glasses. Instrument risk sometimes high because of awareness of using but it can solve by taking care properly. Computer data risk is very low and it can be overcome by back up data in USB. Software risk can be moderate.Progress to DateThe current level of the project work is at initial stage. Firstly I try to understand the how DC system is different than AC system. Furthermore, Try to find research paper related to the project work. Research is started on PBSC (Passive based stability criterion) technique and its main principal of this technique. Try to understand that why PBSC is used for stability analysis rather than another(prenominal) method. I am trying to understand matrix equation of stability criterion. In addition, in the last session I understand how DC system works with capacitor and inductor. Also I get broad knowledge about using capacitor in parallel with any circuit. In however session we will learn whole system and after we will learn the MATLAB software for future simulation.ConclusionAfter completing all task of this report, the stability of dc distribution system is quit complex but it is very useful for high voltage distribution system. It is very reliable and easier than AC system. The PBSC technique is also better than other technique because multi- bus system stability developed. Also PBSC is also analysis the passivity for individual bus system within MVDC system present. This technique is also validated or applies for both simulation and experimental model of four converter system. Also PBSC can fell design and sensitivity to component. There are some benefits of this system such as reduce power dissipation, large currents, weight and cost.References1 Barkley, A., Santi, E. (2009). Improved online identification of a DC-DC converter and its control loop gain using cross-correlation methods. IEEE Transactions on pow er electronics, 24(8), 2021-2031.2 Barkley, A., Dougal, R., Santi, E. (2011, March). Adaptive control of power converters using Digital Network analyzer Techniques. In Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE (pp. 1824-1832). IEEE.3 Bottrell, N., Prodanovic, M., Green, T. C. (2013). Dynamic stability of a microgrid with an active load. IEEE Transactions on Power Electronics, 28(11), 5107-5119.4 Cho, H. Y., Santi, E. (2008, November). framework and stability analysis in multi-converter systems including positive feedforward control. In Industrial Electronics, 2008. IECON 2008. 34th Annual Conference of IEEE (pp. 839-844). IEEE.5 Cvetkovic, I., Boroyevich, D., Mattavelli, P., Lee, F. C., Dong, D. (2013). Unterminated small-signal behavioral model of DC-DC converters. IEEE Transactions on Power Electronics, 28(4), 1870-1879.6 Lin, R. L., Yeh, P. Y., Liu, C. H. (2012). Positive feed-forward control scheme for distributed power conv ersion system with multiple voltage sources. IEEE Transactions on Power Electronics, 27(7), 3186-3194.7 Lin, R. L., Liu, W. S., Chen, J. F., Chen, M. H., Liu, C. H. (2013). Positive feedforward control for multimodule output-series power-conversion systems with individual nonideal sources. IEEE Transactions on Industrial Electronics, 60(4), 1323-1334.8 Riccobono, A. (2013). Stabilizing Controller Design for a DC Power Distribution System using a Passivity-Based Stability Criterion.9 Riccobono, A., Santi, E. (2013). Positive feedforward control of three-phase voltage source inverter for DC input bus stabilization with experimental validation. IEEE Transactions on Industry Applications, 49(1), 168-177.10 Riccobono, A., Santi, E. (2012, February). A novel passivity-based stability criterion (PBSC) for switching converter DC distribution systems. In Applied Power Electronics Conference and Exposition (APEC), 2012 Twenty-Seventh Annual IEEE (pp. 2560-2567). IEEE.11 Rivetta, C., Willia mson, G. A., Emadi, A. (2005, July). Constant power loads and negative impedance instability in sea and undersea vehicles statement of the problem and comprehensive large-signal solution. In Electric Ship Technologies Symposium, 2005 IEEE (pp. 313-320). IEEE.12 Siegers, J., Arrua, S., Santi, E. (2017). Stabilizing Controller Design for Multibus MVdc Distribution Systems Using a Passivity-Based Stability Criterion and Positive Feedforward Control. IEEE Journal of Emerging and Selected Topics in Power Electronics, 5(1), 14-27.13 Sudhoff, S. D., Crider, J. M. (2011, April). Advancements in generalized immittance based stability analysis of DC power electronics based distribution systems. In Electric Ship Technologies Symposium (ESTS), 2011 IEEE (pp. 207-212). IEEE.14 Sun, J. (2011). Impedance-based stability criterion for grid-connected inverters. IEEE Transactions on Power Electronics, 26(11), 3075-3078.15 Zadeh, M. K., Gavagsaz-Ghoachani, R., Martin, J., Pierfederici, S., Nahid-Mo barakeh, B., Molinas, M. (2014). A new discrete-time modelling of PWM converters for stability analysis of DC microgrid. Proc Electrimacs14, 1-6.16 Zadeh, M. K., Gavagsaz-Ghoachani, R., Martin, J. P., Pierfederici, S., Nahid-Mobarakeh, B., Molinas, M. (2015, March). Discrete-time modelling, stability analysis, and active stabilization of dc distribution systems with constant power loads. In Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE (pp. 323-329). IEEE.17 Zenger, K., Altowati, A., Suntio, T. (2006, November). Stability and performance analysis of regulated converter systems. In IEEE Industrial Electronics, IECON 2006-32nd Annual Conference on (pp. 1975-1980). IEEE.Attachment 1 Timeline ChartAttachment 2 Risk Assessment ground substanceRisk ReferenceRisks offspringsCurrentRisk TreatmentsCurrent Level of RiskAdditionalRisk TreatmentsResidual Level of RiskLikelihoodConsequenceRisk LevelRankingLikelihoodConsequenceRisk LevelRankingSUP non available on ca mpusNot get enough informationContact through mail000LNot required000LHLTH-1Health problemDelay in project sentry go needed011LNot required000LHLTH-2 middle related problemEye burningVery less chance112LWear glasses122LPER-1Family issuesNot concentre on workWork management223MProgress work122MPER-2sicknessReduce work efficiencyTake rest011MTake medicines012MEQP-1Laptop not workingLost dataBackup or save file223LOnline store blot out001LCMP-1Cable not workingNot charging properlyProtect the cable111LExtra cable001LCMP-2Tough screen problemNot getting dataUse keyboard001LNot required000LSFT-1Software not availableWork delayTry another software012LNot required000LActivity Overall Risk paygrade0.00LOw