31 3 2012 7 Advanced Technology of Electrical Engineering and Energy Vol. 31No. 3 July 2012 102206 MATLAB TM711 A 1003-3076201203-0016-04 1 2 Distributed Generation 1 Fig. 1 Distribution network without 1-3 2 1 2 1 1 2 L 20km Fig. 2 Distribution network with 2 U N1 3 Y U N2 U N1 / U N2 4 2011-08-10 1988-1972- / 1953-
3 17 T line1 T trans1 1 4 1 2 - X cos ± 2 1 - cos 2 L 2 cos L 1 2 r P L 1 - cos cos ) 7 U X P / P L T loss1 T line1 + T trans1 rl + KR T P 2 L + Q 2 L 3U 2 U U 0 I G X > 1 I G I G L T loss2 T 11 + T 12 + T trans2 KR T + rl P 2 3U 2 L + Q 2 L+ KR T + rm 3U 2 P 2 + Q 2-2P L P - 2Q 2 ΔT T loss1 - T loss2 KR T + rm 3U 2 2P L P + 2Q - P 2 - Q 2 3 ΔT > 0 H rate H rate ΔT T loss1 KR T + rm KR T + rl 2P L P + 2Q - P 2 - Q 2 4 S cr S n KK - 1ΔP 0 / ΔP P 2 L + Q 2 k 8 L S n P 0 P k > S cr K P 2 L 1 - cos L < S cr K - 1 5 cos L Q ± P 2 1 - cos cos 6 S cr 56 4 250kVA > S cr 2 H rate KR T + rm KR T + rl X cos L 2 ( X 1 7 R T 1 T 11 2 K cos T 12 3 T trans2 M X 3 LJ-35 0. 91Ω / km L 20km cos L 0. 8U N1 35kV U N2 10kV 3. 1 S 5 cr 250kVA S 200kVA K 2 4 - S 250
18 31-200 50 < S cr kva 1 3. 2 7 1 400kVA S 200kVA 400kVA 2 315 kva - S 200kVA 2 3 200 kva Fig. 3 Influence on losses by 's location 3. 4 Tab. 1 1 S cr S cr and resistance of different transformers S cr / kva / Ω -200 117. 55 2. 4255-250 148. 33 2. 2050-315 183. 05 2. 1350-400 230. 94 1. 9845 4 7 5 3. 3 7 6 11 3 3 4 Fig. 4 Influence on losses by 's capacity 4 2 0 2
3 19 0 References 2 1 Chen Lin. Zhejiang Universtiy 2007. 2 Li Jing. 3. 5 Simulation research of effects of distributed generation on distribution network loss J. 3 4 Shenyang Institute of Engineering 2009 34 8 205-207. 3 Chiradeja P. Benefit of distributed generationa line loss reduction analysisa. IEEE / PES Transmission & Distribution Conference & ExpositionAsia and PacificC. Research on power system with penetration of distributed generators D. Zhejiang Dalian2005. 1-5. 4 He Xianhao. 4 Calculation of transmission loss in distribution networks with distributed generations D. ChangshaHunan University 2009. 5 Wang Jvping. Technological analysis on how to reduce network loss and improve the economic function of the grid J. Guangdong Technology 20103233 124-25. 1 6 Ma Ming. Studies on the loss impact and placement of distributed generation in distribution system D. 2 NanjingNanjing University of Science and Technology 2007. 3 2 7 Peng Yi. Study on optimal allocation of distributed generation and reconfiguration of distribution network D. ChongqingChongqing University 2009. 4 2 Distributed generation and its impact on network loss of power system LIU LinTAO ShunXIAO Xiang-ningLI Ying-yu Electric and Electronic Engineering CollegeNorth China Electric Power UniversityBeijing 102206China AbstractThe distributed generation would have a significant impact after it has been connected to the power grid and it has a close relationship with the transformer modelnumber of transformer unitslocation of the generator the distributed generation capacity and operating mode. This paper came up with a simplified model under certain 24 cont. on p. 24
24 31 1 270-274. XRAM 3 Dedie PBrornmer VScharnholz S. ICCOS countercurrent-thyristor high-power opening switch for currents up to STRETCH Meatgrinder 28 kaj. IEEE Transactions on Magnetics200945 10 1 536-539. 4 Dedie PBrommer VScharnholz S. Experimental realization of an eight-stage XRAM generator based on ICCOS 2 XRAM semiconductor opening switches fed by a magnetodynamic storage system J. IEEE Transactions on Magnetics 2009451 266-271. 5 Dedie PBrommer VScharnholz S. Twenty-stage toroidal XRAM generator switched by countercurrent thyristors XRAM J. IEEE Transactions on Plasma Science201139 1 263-267. References 1 Lindner KLong JGirogi Det al. A Meatgrinder circuit for energizing resistive and varying inductive loads Em Guns J. IEEE Transactions on Magnetics1986 226 1591-1596. 2 Sitzman ASurls DMallick J. Designconstruction and testing of an inductive pulsed-power supply for a small railgun J. IEEE Transactions on Magnetics200743 6 Liu XiuchengWang Zanji Li Jun. Circuit topology of a new inductive storage pulsed-power supply to drive railgun J. Power System Technology 20093313 80-84. 7 Dierks EMcNab I RMallick J Aet al. Battery-inductor parametric system analysis for electromagnetic guns J. IEEE Transactions on Plasma Science201139 1 268-274. Electrical performance comparison of three inductive pulse power sources CHU Xiang-xiangYU Xin-jieLIU Xiu-cheng State Key Lab. of Power SystemDept. of Electrical EngineeringTsinghua UniversityBeijing 100084China AbstractThe principles of three typical inductive pulse power sources are presented in details in this paper. On the basis of the same initial energy for inductancesimulations are done for the three topologies under the environment of Simplorer. The parameters of the simulation are provided as a reference to implement a prototype. Two vital electrical performance indices i. e. withstanding voltage of the main switch and the current multiplication factorare chosen to compare the advantages and disadvantages among them. Further potential improvements are also mentioned. Key wordsinductive pulse power sourcesimplorer electrical performance 櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆櫆 19 cont. from p. 19 ideal conditions and based on the change of the network structure before and after the introduction of distributed generationderived the corresponding expression of the network loss. Finallythe paper analyzed the influence of the five factors on the net loss of the distribution network by using MATLAB simulation. The algorithm is simple and convenient. It provides a theoretical basis of choosing the location and capacity of distributed generation in the actual distribution network. Key wordsdistributed generationdistribution networknetwork lossoperating modetransformer selection