(完整word版)基于MATLABSimulink的电力系统仿真实验

1、基于 MATLAB/Simulink 的电力系统故障分析10kv系统三相短路分析三相短路（以中性点不接地系统模型为类）模块搭建:明1 U*口匕第;山：1K1却83Jr«1_VDte4Fr« nFLine V1M北:rori2叫2 Line2 31H31LSequeroe Ar-n. yzer三相短路各元件参数设置如下:di Block Parameters; Linel-Three-Phase PI Section Line(link)Thii block inpleaents a three-phi.it PI section lint to represent a th

2、iQG-phasG transaision Hug. This block rGDresents only one PI section. To inplenentc aore that one PI section, you siaply need to connect copies of this block in sexies.ParasctoruFreauency used for R L C specification (Hz):F5Poiitive- ind zero-seauence resiBtances (Ohas/'ka) Rl RO :| 0.01273 0. 3

3、SG4：Positive- and zero"£eo.uencG inductances K,lcn) Ll LO :|T 0. 9327e-3 4. 1264e-3Positive- and Z4ro-ssau4nee ea.Dacitane5 (Fjks； I Cl CO I :I 12. 74e-9 7. 751©-9Line section length (ksC :1130OK I CancelHelpApplyOKCancel0 Block Parameters; LoadlTiiree-Phase Series RLC Load Dask link)

4、ZsDlwentg a series RLC lead.Klp1 Apply IOKCancel I E«lp吗 Source Block Parameters; FromFroaKeceive sienals; froa the Goto block irith the specifiGd :ag. If the tae is defined as r scoped' in the Goto block, then a Goto Tae Visibility bl-ock aust te used to define the visibility of the tag. A

5、fter ： Update Diafraa t the block icon displays the selected tag nase >Local taes are enclosed in brackets. ., and scoped tag na=es are enclosed in braeg; ：).Function Block Parameters; AcdlSubAdd cr subtract inputs. Scify cne of the fol.ovxng: a string containing or - for each input port, for spa

6、cer tetrem ports (e. c. - -|fb) scalar >s 1. A value > 1 scat all inputs: 1 sunt lotnts of a s:ngle input vectorApp1t虽 Function Block Parameters: Discrete 3-phase Sequence AnalyzerDiscrete 3-Phase Seaucnce Analyzer zask) (linkThis discrete blok outputs the positive-. negative"- zero- or a

7、ll sequence component (s) 'Magnitude and Phase) of a set o£ three balanced, or unbalanced signals Khich say contain harmonics. The three SGQUGace cozsponents are computed as folllows:V1 = 1/3 * (Va - a*2 *Vc )V2 = 1/3 * (Va a ,2"” a «Vc )VO = 1/3 * (Va + Vb 十 Vc )where Va.- Vb： Vc

8、 = input phasors at specified frtQueacy a =<xp(J "pi/3) = 1 < * 120 dec. cozip lex operatorThe input contains th.e vectorized iiEnai of the thie* Va Vb Vc sinusoidil signalsOutput one and two give respectively the magnitude peak value) and phase deexccs) c£ the spco £££

9、;cd sequeno e oo=poncn(cl .For the first cycle of sisulation, the ouputs are held coastant tG the vsIugs specified ty the parameter *Initial input*.Fundamental frequency Kz): | 50Sequence : | ZerojrjInitial Input Fos. Se<. Iag Phase dsgxess J:TToSample tiae:|5Ce-OK I Caneol三相短路仿真波形如下:如图1a、b、c三相短路

10、电流仿真波形图分析：正常运行时，a、b、c三相大小相等，相位相差 120度。发生三相短路时，a、b、c三相电压全分析：在没有故障时，没有零序电流，突然由现故障时，零如图#线路1的零序电流序电流为故障电流的 3倍，为3Io如图3线路1的零序电压分析：在没有故障时，没有零序电压，突然由现故障时，零序电流为故障电压的 3倍，为3U0o如图4线路1的故障相电压如图5线路3的零序电流如图6线路3的短路电流如图7三相对称电源电压如图8线路2的零序电流分析：在没有故障时，没有零序电流，突然由现故障时，零序电流为故障电流的 3倍，为3I0如图9三相对称电源电流如图10三相对称电源零序电压如图11 一相短路电流

11、10kv系统两相短路分析仿真模块搭建同三相短路，只有三相故障模块参数改变如下： 注：a、b两相短路6000.SOOO40002000-20004000O 04O.OfeML.o 1Bo oe一 TTil分析：两相短路原理同三相短路，两相短路复合序网图 是无零序并联网，短路两相电压相等，电流互为相反数，非 故障相电流为零。零点漂移轨迹的验证理论分析对于以下简单的中性点不接地系统，当其发生单相接地% + %口 + % = 0 其中勿=1评+加监，%=心=於仇分别表示a、B、C三相对0点的导纳%=心/(1+”四用复数形式可表示为Uv = L _讪一气33品正下其相量关系如下图:则B =一匕口-“3就?(1号可得1cos fl =/ 1s , (03% J1 + (3址品即一所以，可以推由中性点不接地系统发生单相接地故障后，不同接地电阻下，对应的零点漂移轨迹为接地相右半圆.二 matalab 仿真模型搭建类似单相短路加立匕Fl Sectaon LftTf呼：v =巴心计电源参数设置ParanneteFSBranch typa: RL| vResist