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40 11 “d e Vol.40 No.11 2012 M 6 1 Power System Protection and Control Jun. 1, 2012 s fZ . v 6 2 _s K1 [Y y s4 i _ b“d I n IM TK T _ 8 I nY ]Z T/ a eZ Tx [T HW 5 b ty s 4 L p pM O Tp b / [2] b DG 5ZE / m 1 b { q8C yN 3 Y bp HYV 7 PCC LCKvK DG 4 V L b p H “ 5 c IM s T H b m m Fig. 1 Schematic of the microgrid - 56 - “d e V 7 { IM DG y YK vyN p f /E4v P.dV qE [3] bD [4]YV|s s p H|Ms M“ V ZE1 18 I n dd a,b,c,n k k II I , [ 1] 4 T HW 7 O|s sZE9 KvK DG s V L bD [5] 9 , , Z_ V[ /L i _ ZE L b D [6-7] 3 V[_ V V / 4 O VI V LCMWY ZE 1 p bD [8]| dq US |M] IM1 vT5KC u up us YV] WY LC I n DG eZ T] H qY b 1 5V s 4 Btn 5 ZEe aY b I n5 v] 1- y b _ .d 45 4 [9] b B ] |] eZ T ;t { q s Y1 v YV ZE P p 51 v “d6 yN V 3 “S Kv q s T { q { q [10] 9 HB N o p b F 9 ZE H V S s Y b Y ] B Y bp H 1 9 1 p H M“ bY V[ zt b L PZL b |T Bs I n MMS 5 “d [11] m U b MMS K6r]s “ MMS f / V I n| ] M Yh “d g b ]Z T/ a ; V[i V[ 9{ GHq/ DG 4 IM DG E4 v biHq/ VYV F s 4v I M DG4 ] lB s [12] b Z T/ Yv BZ T/ V ZE 6BZ T / V M V b m F sp Fig. 2 Analysis of the fault current by means of superposition theorem tB Z E [9] B KHq P V[] Z T 9 V[ a Z T { b - VYV]Z T/p 9 M LC yKHq F P M b V[YVB* T ]Z T a1 p1 b p M“ HW s T 0 g P 8 aY y b M]/p M“ HW P “d b p M“ HW I n p M““d b ]1 v “p M“ HW M p “p b“ HW [10] b ] eZ T DG e e “ -1 DG fZ s - 57 - eZE1 [13] n e a PQ e a P-fQ-V/M b s T eZE 9 H I np f i |A1n KK C HW ] H Z T9 s I n DG eZ TY 9 eZ TMx V a eZ T b 9 ]vB“ 3p HY M7 YV 4| ps M“ “ds b“d t“4 T1 yN M“t b p Yps V s / f m 1 1 p F1 2 L p F2 3 p F3 b F1 up b F2 p V b YV 1 q LCi M q 5 s IM eZ TK TY b O Y H |pL M“yp HW 7 P b F3 pk , | M O Tp b[ LZ T - V | M O d abc k k ii Tp m 3a b YV L m 3bg V[ | M O d a,b,c,n k k ii b 3p f / d i 0 u 3p H d i 0 T V LCp/ T b Z EQ u p s IM eZ TK Y OT b v L 9/ v-g] H9 8 W L b I n LCZE e H ]“ V[4 Z_1 b m p Fig. 3 Protection of load faults a. ungrounded b. grounded pMp ]1 [ ZE V[ LCt f p b t 1 p VL M m 4 UZE]“ a M b m M Fig. 4 Protection of each phase L 2 H HK 7 M1 DG b[ DG 4 4 HW v[ T H W b _s |m 1BH L_ m 5 b 380 V L DGDG eZ T m 6 U V dc 800 V IM g LC ro L f 0.6 mHC f 1 500 μF b DG P50 kWL B E F _[1 E E R l 0.0641 ΩL l 0.032 mH bZ T H DG 1 Load1 LE 1 R 1.25 ΩL1 mH b - 58 - “d e m Fig. 5 Schematic of the microgrid in this paper eZ T DG eZ T98 m 6 U b m eZ T98 Fig. 6 Schematic of a DG control system DG P-fQ-V/ of L 1 , . / [J]. “d e , 2009, 37 8 114-119. XIAO Hong-fei, LIU Shi-rong, ZHENG Ling-wei, et al. A preliminary research on microgrid technology[J]. Power System Protection and Control, 2009, 378 114-119. f1 . s T Y [J]. “d e , 2010, 38 3 1-510. ZHOU Wei, ZHANG Yao, XIA Cheng-jun, et al. Effect of distributed generation on relay protection of distributed system[J]. Power System Protection and Control, 2010, 383 1-5,10. Lasseter R H. Microgrids[C] // IEEE Power Engineering Society Winter Meeting, 2002 305-308. Nikkhajoei H, Lasseter R H. Microgrid protection[C] // 2007, IEEE Power Engineering Society General Meeting, PES. Manjula Dewadasa, Ritwik Majumder, Arindam Ghosh, et al. Control and protection of a microgrid with converter interfaced micro sources[C] // 2009 Third International Conference on Power Systems. Sortomme E, Mapes G J, Foster B A, et al. Fault analysis and protection of a microgrid[C] // 40th North American Power Symposium, NAPS2008. Eric Sortomme, Venkata S S, Joydeep Mitra. Microgrid protection using communication-assisted digital relays[J]. IEEE Transactions on Power Delivery, 2010, 254 2789-2790. Al-Nasseri H, Redfern M A, Li F. A voltage based protection for micro-grids containing power electronic converters[C] // 2006 IEEE Power Engineering Society General Meeting, PES. u o . es [D]. v , 2008. XIAO Zhao-xia. Control and operation characteristic analysis of a microgrid[D]. Tianjin Tianjin University, 2008. Hannu Jaakko Laaksonen. Protection principles for future microgrids[J]. IEEE Transactions on Power Electronics, 2010, 2512 2910-2918. Jayawarna N, Jenkins N, Barnes M, et al. Safety analysis of a microgrid[C] // the Future Power Syst. 2005 Conf. FPS, Amsterdam, Netherlands, Nov 16-18, 2005. *fy . M15/ [J]. “d e , 2010, 38 19 235-239. SU Ling, ZHANG Jian-hua, WANG Li, et al. Study on some key problems and technique related to microgrid[J]. Power System Protection and Control, 2010, 3819 235-239. Pogaku N, Prodanovic M, Green T C. Modeling, analysis and testing of autonomous operation of an inverter-based microgrid[J]. IEEE Transactions on Power Electronics, 2007, 22 2 613-625. l Te fZ 3 31Z_ a e E-mail yuhai9798 sina.com 3p V q1Z_ S b
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