實驗三配電網單相接地故障仿真實驗

1、實驗三 配電網單相接地故障仿真實驗（中性點不接地運行）一、實驗目的1、理解簡單配電網系統(tǒng)的搭建方法；2、掌握用simulink仿真中性點不接地系統(tǒng)的方法;二. 實驗工具電腦、matlab軟件三、實驗內容1、采用simulink i具搭建配電網單相接地故障的電力系統(tǒng);2、設置各個模塊的參數；3、對該電力系統(tǒng)進行仿真分析。注：配電網單相接地故障的電力系統(tǒng)simulink模型為圖10kv中性點不接地系統(tǒng)仿真模型四、實驗過程1、各個模塊參數設置: 發(fā)電機參數設置：parametersphasetophase rms voltage (v): 10. 5e3|phase angle of phase a

2、 (degrees):0frequency (hz):0 00529source inductance (h):0.000140linel的參數設置parametersfrequency used for r l c specification (hz):50|positive- and zero-sequence resistances (ohms km) r1 : fo. 01273 0.3864positive- and zero-sequence inductances (h km) l li lo jfo.9337e-3 4.1264e-3positive- and zero-seq

3、uence capacitances (f/km) cl co .12.74e-9 7.751e-9line section length (km):line2的參數設置parametersfrequency used for r l c specification (hz) :and zero-sequence inductances (h km) li l0 :positive-0.9337e-34. 1264e-3positive- and zero-sequence capacitances (f/km) cl co : tl274e-9 7751e-9line section len

4、gth (km) :175line3的參數設置parametersfrequency used for r l c specification (hz):0.01273 0. 3864positive- and zero-sequence inductances (h/km) li l0 :t 0.9337e-3 4.1264e-3positive- and zero-sequence capacitances (f km) cl co : 112. 74e-9 7. 751e-9line section length (km):1line4的參數設置parametersfrequency u

5、sed for r l c specificstion (hz) :positive- and zero-sequence inductances (h km) li l0 :0. 9337e34. 1264e-3positive- and zero-sequence capacitances (f km) l cl co : 11274e-9 7751e-9line section length (km) :150loadl的參數設置parame 七 ez*scon£ i gtiira-t ion y (£loaxing)nomina 1 phase七 ophase vo

6、 1 xase vn (vrirms)103nomina1 frequency £n (hz):50ac i v=* pcwwt* p (w):1 oe6i nd vic t: i vo reac 七 ive power ql (positive var):o. 4e6load2的參數設置paxame 七 ex sconf i goxretl: ion y (f* loa-t ins)nom i na 1 phwise七 ophase voltage vrn ( vrms)103zomx net 1 £zruciuunuy £n (iiz ) :50active

7、power* p (w):o. 2e6i nduc x i ve xemc 七 x ve poxvex* ql (pos i x i ve var): o. 4e6car>ac i t i vo areac x i ve jdower qc (negax ive vax* ) omeasixirement s nonoload3的參數設置pax*ame*t ex*scon£* iguiara-tion | y (f* loax i ng)nomi na 1 phase tophmse voltage rn (vrms)103nomx n&. 1 dfx-ocjvionc

8、y £n (hn:50ac x i ve power* p (w):2e6indocxivo xroac x i r& powex ql (positive vax*):o. 4e6car>ac it: i ve x eac 七 x 7 e powex qc (negax ive vax*) : ome a sox* erne nt: s i zoneload4的參數設置parame七ersconfiguration y (floating)nominal phasetophase voltage vn (vrrms)10e3nominal frequency fn (

9、hz):50active power p (w):10e6inductive reactive power* ql (positive var):0capac it i ve area c*tive power* qc (negative vair)系統(tǒng)的零序電壓以及每條線路始端的零序電流按下列方法獲得:from5a匸3u0故障點的接地電流按下列方法獲取:multimeter故障后的零序分量也可以按下列方法獲取:discrete 3-phase sequence analyzerun«1 310五、實驗結果:310131023103id3u0phase(deg)mag 10(a)六、實驗結果分析從仿真結果我們可以看出，系統(tǒng)在0.04s吋發(fā)生a相金屬性單相接地后，a 相對地電壓為零，bc相相對地電壓升高v3倍，但相電壓仍然保持對稱，故對負 荷沒有影響；同時，我們還從仿真結果可以看出，各線路的始端零序電流，接地 電流的有效值與理論計算值相比有一定的區(qū)別，但其誤差都不會超過3%,而幅 值只相差0.3%；中性點不接地方式下，非故障相的零序電流超前零序電壓90°； 故障的零序屯流為全系統(tǒng)非故障元件對地屯容屯流z和，零序電流滯后零序電壓 90°；故障線路的零序電流和非故障線路的零序電流相位相差180%七. 實