matlab在电力系统分析中的应用1.docApplicationofMATLABinpowersystemanalysis1.doc

1、matlab在电力系统分析中的应用1.doc（application of matlab in power system analysis 1.doc）shandong electric power(*) & "),* (0).-/-& '! "" # no.period (general)abs) period!2 (3. (4) applications in power system analysis#! "$%& '(' + *),+-.$/$0!",1+2#3456*#7$,) &

2、;56 '6peng ganrong, li yue, li zhongcheng, zhao na, zhang xiaojie5 shandong ji'nan power supply company, shandong, ji'nan"$#!"!sixabstract: introduce2 (3. (4 software) applications in power systems, as well as2 (3. (4 environment) dynamic simulation tools&789:7; < < p

3、ower system toolbox > >=&45=> a?&bcd84:>e<cd6 functions and features; and2 (3. (4) simulation platform for power system modeling and dynamic simulation analysis. practice shows,2 (3. (4) is a powerful utility for power system modeling and simulation analysis.key words: system

4、analysis; simulation model; simulation software$86*3) (*9)3f7cghga7; da>i9ecdfhgg:7ehd7> c>j(2 3. (47;g> a?cbcd8h; h:bc7ckdf;dfj9; ed7>h; ijhd9a>j&789:7; <h; i=&4five= > a?&bcd84:>e<cdsixlhci>23. (. 4m3f;8h<7; n9c7; n>j2 (3. (4k)df7cghgaehaa7c>9d

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6、ot;" "p" - 11 "%"five"#!"six"!" - "%1" #simulation enables us to study the power system more deeply< introductionas characteristics$t.with the development of electric power industry, the scale of power system is more and more=$/$0!large, espe

7、cially with the advent of the internet, the number of nodes in the system is originaldozens of them have risen to hundreds, or even thousands. for this, 2 (3.) (4) is made up of2hda7u and.hl>ahd>ab compositelarge power networks would like to use the original hand method to generate power syste

8、ms, the original intention is the matrix laboratory.2 (3.) (4 environment)5 or the languagethe analysis and calculation is impossible, and we must resort to the advanced language6 by the united statesv:w2>: dr. a in$1x "made by year research."computer technology and powerful system simu

9、lation software are used to develop complex power work2 (3.) (4 of the original intention is to make it have a powerful matrixsystem analysis and calculation, thus deepening our power system processing functions. experts in modern control theory face highsolutions to further guide our work in power

10、systems. the problem of dimensionality control; the desire for a more advanced language than at that timenow, the available system simulation tools are availabler23=, (= & &= more readable language, so2 (3. (4 language) available,and2 (3. (4), etc. stay&=, (= & users need to fill thr

11、ough similar experts in the field of control theory is first concern. similarly, the power systemthe way to write data is to design and define various system components and control systems. it is a relatively complex and high dimensional system,(2 3. (4because of the lack of a good graphical input i

12、nterface, the user will make it a powerful and effective tool for analyzing power system problems. pluswith easy to feel boring, and lose interest in learning, with experts quebec north power company g first made this work,also(= & &= through the user-defined method is not suitable for build

13、ing algorithm2 (3.) (4 environment) developed(2 3. (4y&789:7; <yvery complex models, such as fuzzy control simulations, are compared to 3>>: l>uy= > al:>e<cd?5 power system analysis module6, anddifficulties. stayalthough the r23= provides powerful electromagnetic transient c

14、alculation, the establishment of the power system related equipment librarys! t.function, but because of the lack of modules and algorithms, it is very good to open 2 (3. (4 language) with matrix as the basic data unittherefore, it is difficult to carry out the two development on this basis. infor p

15、owerful matrix computing, almost all commonly used matrix operations2 (3.) (4), the power system model can be&789:7; < environment >, such as adding, subtraction, multiplication, division, transposition, inversion, decomposition and operation of matricesdirect build, also can according to

16、the object of study, physical model to establish its column, etc., all has the ready instruction.2 (3. (4) also has the order, the electionmathematical model, and encapsulate and customize the user's own module, select, cycle, and other structural control statements, and with a large number of o

17、peratorsthe library fully shows the advantages of its simulation platform. at the same time, it is more important to write object-oriented features that conform to structured standardsyes,2 (3.) (4) provides rich toolbox resources, as well as large programs.2 (3.) (4 of the work environment, includi

18、ng commands, controls, windows, procedures)volume of practical modules in&789:7; < environment > not only can order editor, and so on, user can execute directly through command control windowthe simulation calculation of power system can also realize complex control method, line command, a

19、nd also through establishment2 (3.) (4 script file or function)%1shandong electric power"the #!"period (general)abs) period!(*) & "),* (0).-/-&. "the command in the file execution program.1 (2.) (3 systems mainly include the following five parts)four!1 (2. (3 language)1 (

20、2. (3 language) is a kind of include controlstream statements, functions, data structures, inputs5 output and object orienteda high-level language for programming features; it uses matrices as its basic data sheetit can quickly create small programs and complete simple operationsfor complex applicat

21、ions, write complete large applications."1 (2.) (3 working environment)1 (2. (3 working environment master)include a series of variables, such as managing the workspace, and dataenter5 output,1 filessix1 (2.) (3 of apps)7 generation,debugging and interpreting tools.# handle graphics graphics ha

22、ndle is1 (2.) (3 graphics)the system includes both two-dimensional and three-dimensional data visualization graphicsadvanced commands for visual display of presentation and image processinggraphical display, creating a complete graphical user interface for your application(0-) command.$1 (2.) (3 lib

23、rary of functions), the library collects huge amounts ofmathematical functions and algorithms, from simple mathematical functions such as89:, < = 8,>? < = 8; and complex operation, such as inverse matrix, complex functioneigenvalue,3=88= function,aa2.%1 (2. (3 application program interface)

24、 (b-), it is oneallow users to write and1 (2. (3 interactive)c anda+d2d+)library of programs, including1 (2. (3) calls, programs, calls1 (2.) (3) as engine and read5 write1 (2 files).on the whole，1 (2. (3) is a numeric calculation software,it combines scientific computing, automatic control, signal

25、processing, neural networks and graphsimage processing and other functions in one, with high programming efficiency, program designflexible, graphic features and so on. it has evolved into fit multiplepowerful software for a wide range of disciplines and platforms.simulation tools"#$%&#&quo

26、t; (1 (2. (3) provided by dynamic system simulation tools&: 9; <e,it is the most powerful, excellent and easiest to use in many simulation softwareused to model, simulate, and analyze a dynamic system,it supports continuous, discrete-time, and linear mixtures of the twothe linear system also

27、supports multivariable, multirate systems.&: 9; the basic modules provided by <e include the source library6&, 9f>=7, receive module library6&, <e87, continuous system module library6c, <g, <9 87, discrete system module library6*, 8>f=gg=7, mathematical arithmetic modul

28、eblock library61hgi+j=fhg; <87; signal routing module library6& k<hd, 9g; <k7, port and subsystem module libraries6b fg8?l&9m8n8g=: 87wait。 as needed, the user can select the required modules from the module library#"block to form your own systemo also encapsulates its own modu

29、lesthe library of its own module is used to realize the simulation analysis of the system.&: 9; <e provides users with block diagrams for modelingmodel interface, and its simulation software package with the traditional differential equation and differencecompared with differential equation m

30、odeling, it has the advantages of more intuitive, convenient and flexible.the user only selects the modules with the mouse, and puts in the new modulefinally, the modules are wired together to complete the particularcreation of system model. after defining the model, the user can pass&: 9; <e

31、 menu; or1 (2. (3) command window type commandto simulate.simultaneous,d2p6d=h: = 2;p? fe8i? j?7 is ok&: 9; the <e module providesc code generation function,so users canadopt&: 9; <e establishes the system model and advances for different parametersdynamic simulation, through the const

32、ant adjustment of parameters, to find the systemthe best implementation model parameters at this point can be passedd2p module straightgenerate correspondingc language program, and this procedure is excellenttherefore, the system can be realized conveniently and rapidly by utilizing the functionmost

33、 of the work can be done&: 9; complete in <e environment,finally, you just have to generate the optimizationsc code embedding system. from somein degree,&: 9; <e; andthe emergence of d2p is powerful1 (2q(3 functions at the same time, also change people to open the systemdesign flow.pow

34、er system toolbox (* +)1 (2. (3) provided by the power system toolbox (b, r=f)&n8qg=:3 >e8=g hereinafter referred to asb&3) mainly from canada'nsf?t9=m=> and2uc&-1-<g=f<hg; <h company co operating?it is very powerful and can be used in circuits, power electronicsthe si

35、mulation of the system, the motor system and the power transmission processmodel modeling is done in a manner similar to circuit modeling, and will be done before simulationautomatically change it into a state equation describing the system form, and then in the&: 9, simulation analysis under &l

36、t;e.1 (2. (3 modeling) can also be called directlyelectrical in b&3modular。b&3 contains rich component models and almost provides the compositionall components of a power system, including power systems, network components, and machineselectrical equipment, power electronic devices, control

37、and measurement links, and three-phasecomponent library, signal display module connection module, etc.&: 9; found in <e toolbox. meanwhileb&3 provides graphical usersinterface6b r=f?0-7, it allows the steady-state analysis of the circuit to be obtainedchange, and1 (2. (3)j? r=f! 8n8 funct

38、ion can make circuitthe simulation results are translated intothe states represented by four matrices, 3, c, and *calculation and analysis of simulation results are implemented in variable form.shandong electric power(*) & "),* (0).-/-& '! "" # no.period (general)abs) peri

39、od!this approach makes complex modeling problems extremely simple,the user only needs to find the corresponding electrical components in the model librarythe input element parameters of the shape interface can be used to model the corresponding components;and then by dragging, pulling and other comp

40、onents of the required components can be completedsystem modeling, and then set a certain simulation parameters, you can carry out the systemsimulation analysis.simulation examplefor better illustration1 (2. (3) in power systemsyes, we do1 (2. (3) build onetwo machine system, and through imitationre

41、al analysis to study powersystem stabilizer4&&(45678&9:; 7<& = >(ab78) and static reactive powercompensator&cd (& = = ec=8d5<f7g:=; 58) yesthe transient of the two machine systeminfluence of stabilityhijkh%j.stay1 (2. (3)the architecture of the system, such aschartas

42、 shown in $. systematic tracinggenerator as follows1$for one$"" "1l"a hydraulic generatorpass onem "km","nc" # transmission levelthe line is connected to the loadthe heart # ("the 1l electricresistive load) load bydistal$"" "1l"factory

43、 and local# "1l"alternator1 at the same timeelectricity; transmission line transmissiono# "1l power connectionnear its natural power(&p8q7a<f7r=ge7.5=rgq) omm1l; forthe maintenance system is in faultafter the stability of transmissionthe line is compensated in parallel at one p

44、oint"" 1s=8:, static none. "power compensator&cd; the turbine governing system of the two generator is made up ofwater turbines and governors, excitation systems, and power system stabilizers threea partial composition, as shown in fig.as shown.!"# single-phase grounding faul

45、t (consideringthe influence of $%, do not vote%&) "simulation purpose: no static var compensator is put into this system(&cd) analyze and study the power system stabilizer (4&&) for thiseffect of system stability. simulation conditions: uset=pa;387=u78module in;v "w$: gener

46、ates single-phase ground fault, and;v "w!:chartwiring diagram of $two machine systemchartthe wiring diagram of the turbine governing system#$shandong electric power"the #!"period (general)abs) period!(*) & "),* (0).-/-&. "time out trouble.simulation results from roto

47、r angular difference (67879): < = (;>? =9?=: a=) generator speed (&b=c)7?deaf>: =) and&23 nodevoltage three aspects of comparative analysis, the results are as followsas shown in g. no.one track is the rotor angle difference curve of the two generatorangle reaching"h" when

48、 the power transfer reaches its maximum value; if it turnsthe angular difference exceeds the length of time"h" degrees, the generator will be out of sync,the system tends to be unstable, as shown in the dotted line. the second trajectory isalternatorthe speed curve of d$can be observed dur

49、ing the fault bythe electromagnetic power of the generator is lower than the mechanical power, resulting in the generatord$rpm increases. the third trajectory is&23 node voltage curveline。 from the mapthe simulation results of g can be seen without input&23,the influence of 4&& on sy

50、stem stability.!"# three-phase grounding fault (considering$%& effect of investment"$)chartsimulation results of g single-phase fault1 considerationsthe effect of 4&& is not cast&23fivesimulation objective: when a serious emergency fault occurs, analysis andthe effect of st

51、atic var compensator (&23) on the stability of power grid is studiedring. simulation conditions: useiej<8k9=el=9 module ineightm "n$othree phase earth faulteightm "ntroubleshooting at o.simulation results from rotor angular difference (67879): < = (;>? =9=: a=),chartthree phas

52、e fault simulation results1 considerations&23 impact, input4&&five#!shandong electric power(*) & "),* (0).-/-& '! "" # no.period (general)abs) period!generator speed (&2334fifty-six789:; <3), and &=> node voltage&=> susceptance of the four

53、aspects of comparative analysis, the results as shown in figure%show. the angle difference curve can be observed from the rotor without input&=>when the fault is cleared, the two generators lose their synchronization quickly, and the system tends tounstable, as shown in dotted lines in the fi

54、gure;&=>, fault clearingthe latter two generators recover synchronously through damped oscillationstable, as shown in the solid line shown in the figure. from the map% of the simulation results can be seena&=> influence the stability of the system in steady state,&=> in driftthe

55、 floating state (i.e., no work), once the node voltage deviates from its reference value,&=> to transmission line reactive power injection voltage compensation.conclusion!this article gives a brief account of7. ( software should be in the power system,and to7. ( simulation platform for power system modeling dynamicsthe simulation analysis fully shows7. ( software's optimality. andand,7.on the basis of the solution of differential equations, the electromagnetic processes are equal to those of electromechanical processesstep calculation, the simulation is very