HIỆU QUẢ HẠN CHẾ DÒNG ĐIỆN NGẮN MẠCH CỦA THIẾT BỊ HẠN CHẾ DÒNG NGẮN MẠCH KIỂU ĐIỆN TRỞ TẠI TBA 110 KV BÌNH AN

Transcription

1 HIỆU QUẢ HẠN CHẾ DÒNG ĐIỆN NGẮN MẠCH CỦA THIẾT BỊ HẠN CHẾ DÒNG NGẮN MẠCH KIỂU ĐIỆN TRỞ TẠI TBA 110 KV BÌNH AN Effect on fault current lever reduction by using resistive fault current limiter in 110 kv Binh An substation Speaker Dr. NGUYEN Nhat Tung Head Department : Power Plan & Transformer Station Electrical Faculty - Electric Power University 16/11/2017 Hanoi 11/2017 1

2 Plan of Presentation 1 Part 1. Vietnam Power transmission grid and context of fault current on transmission line 2 Part 2. Solution for limiting short circuit curent on grid 3 Part 3. Binh An substation transformer 110 kv south of VietNam 4 Part 4. Simulation of power network parameter the R-FCL 5 Part 5. Installation and Simulation of Fault current limiters on grid of Binh An transformer 110 kv 6 Conclusion 16/11/2017 2

3 Part 1. Vietnam Power transmission grid Vietnam Power sourse Power System Vietnam grid : 37604MVA Northern area VN: Hydro Centrals at Sơn La (2400 MW) & Hoa Binh (1925 MW), Thermal Centrals : Uông Bí (740 MW), Phả Lại (1200MW). Central area VN & Tây Nguyên: The most electrical centrals are hydro central with medium type. Southern area VN: This area has many gas fields, it is favorable for the development of gas-electric power The power system source : most at North & South VietNam. 16/11/2017 3

4 Part 1. Viet Namese grid Year Voltage Lever Line TS Line TS Line TS Line TS (Km) (MVA) (Km) (MVA) (Km) (MVA) (Km) (MVA) 500kV kV kV TS : transformer substation Update 2015 : - L ine 500kV: two circuits with total power ~ 20000MVA - Line 220kV & 110kV: growing strongly in recent years - Northern Area : Investissement most of transformer susbtations high voltage - Central Area : only 02 transformer substations 220KV & line unique : base Security - Centre Southern Area : 1 transformer substations 500kV & 6 transformer substations 220kV assure the high security - Southern Area : 04 transformer substations 500kV & 11 transformer substations 220k. 16/11/2017 4

5 Part 1. Context of fault current on transmission line T ST name 3 phases One Line to T fault ground fault 1 Phú Lâm 44,414 41,217 2 Nam Sài Gòn 51,035 50,327 3 Nhà Bè 57,260 62,726 4 Phú Mỹ 61,290 70,271 5 Mỹ Xuân 43,954 35,213 6 Cát Lái 46,970 40,163 7 Thủ Đức 47,910 43,681 8 Hiệp Bình Phước 30,684 24,518 9 Hóc Môn 39,057 27, Cầu Bông 34,373 29, Vĩnh Lộc 34,495 32, Bình Tân 38,968 37, Phú Lâm 44,414 41,217 Many points with short-circuited current exceed the admissible value 16/11/2017 5

6 Part 2. Solution for limiting short circuit curent on grid Solution Advantage Weakness Investment New transformer Sub. Upgrading of high lever switching equipment Modification of grid structure, such as grid, bus bar... in planning stage Direct Solution Separation of resources easily fault current. High investment & longtime Complex, the line needs to be upgraded. Reduce the reliability of power supply High investment Medium Expensive if Trans.Sub does not have reasonable bar structure before Use of X-FCL on grid Simple in design and installation Voltage drop and power loss in the normal mode Low investment Apply intermittent switching. Don t need investment for equipment Causing prolonged time before switching the fault Minimum cost 16/11/2017 6

7 Part 2. Solution for limiting short circuit curent on grid Location possibility for FCL on grid 1- FCL 2 - FCL Réseau de Transmission M. Noe and B. R. Oswald, "Technical and Economical Benefits of Superconducting Fault Current Limiters in Power Systems," Applied Superconductivity, IEEE Transactions on, vol. 9, Réseau de distribution 3 - FCL Réseau de distribution SC câble 9- FCL 9- FCL Réseau de distribution 4- FCL 5- FCL 10- FCL 11 - FCL 6 - FCL 7 - FCL 8-FCL 16/11/2017 7

8 Part 2. Solution for applying resistive fault current limiter Weakness of X- FCL (inductance FCL) Connected on grid :loss on normal operation, difficulties in controlling the power network Connected on neutral point of transformer : neutral point voltage step-up leading to phase voltage step up Advantage of R- FCL (resistive FCL) on neutral point of transformer Easy to reduce the fault current Reliable with the Vietnamese power system network, unsymmetrical short circuit often happens Calculation of R FCL Calculating necessary resistance Selecting material for resistance Installationmode 16/11/2017 8

9 Part 3. Binh An substation transformer 110 kv south of VietNam - Transformer : 2x63MVA - Voltage : 110/22/6,6kV - Power supply : form 2 lines 110kV - Load 3 Phases :33,6% - Load single phase :0,2 MVA to 1,2 MVA R-FCL calculated Bus bar Capaciti ve current I C,(A) Neutral conductor current, A C42 20,57 82,28 16/11/2017 9

10 Part 3. Operation Context at Binh An s transformer substation Grid The Binh An Substation has a neutral point grounded by resistors manufactured by TELEMA The neutral grounding resistance of the MBA resistor is Ω, Due to the hot tropical climate, resistance equipment has thermal problems, resulting in equipment failure. Neutral resistance is removed 16/11/

11 Part 4. Simulation on grid of Binh An transformer substation 110 kv Cases of simul ation Grid s operation on normal mode compare real operation mode Simulation of court circuit condition Determine fault current value Simulation network with the varying resistance in the neutral of 22 kv - Determine fault current & overvoltage for one phase transformer Simulation network with asymmetric load, with resistance in the neutral Determine reliable of resistance in neutral point with different condition Parameter the value of resistance in the neutral transformer Consequence of R-FCL on grid 16/11/

12 Part 4. Simulation Power network 22kV of Transformer T2 - Binh An transformer Substation Simulation Model Compliance: Real network 3 phase load : 30% 1 phase : 1% Result normal operation U = ~ 18 kv I A (A) - simulation I B (A) simulation I C (A) simulation esult one line ground court circuited 697,5 691,5 674,9A Fault current N (1) simulated (ka) I A = 15,47kA Current measured : 615 A Fault current N (1) measured (ka) I N = 16kA 16/11/

13 R_Power Max Unbalance Single Phase voltage (kv) Part 4. Simulation Power network 22kV of Transformer T2 - Binh An transformer Substation One line to ground fault result of simulation with neutral resistance varying Single Phase SC Current (ka) I_SC (ka) UB (kv) UC (kv) I_N_Max Unbalance R_Power Max Unbalance R_Power Min Unbalance I_N_Max Unbalance I_N_Min Unbalance Resistance in Neutral (Ohm) One-phase short circuit simulation (Phase A)-earthling neutral resistance varying Resistance in Neutral (Ohm) Neutral resistance current and power, normal mode 16/11/

14 CURRENT ONE PHASE GROUND COURT CIRCUITED (KA) Part 4. Simulation Power network 22kV of Transformer T2 - Binh An transformer Substation VOLTAGE OF NEUTRAL POINT, KV One line to ground fault result of simulation with neutral resistance varying 20 4,5 4 3,5 3 2,5 2 1,5 1 0,5 0 3,885 2,69 2,985 2,28 2,407 2,183 2, RESISTANCE IN NEUTRAL (Ω) ,29 14,41 14,7 14,87 14,96 13,78 11, RESISTANCE IN NEUTRAL(Ω) 16/11/

15 Part 4. Calculation value resistance neutral point One line to ground fault result of simulation R N,Ω 0, I SC, ka 13,64 3,885 2,985 2,69 2,42 2,28 2,197 2,183 U N,kV 4,91 11,78 13,78 14,41 14,7 14,87 14,96 17,29 U B, kv 9,23 17,63 20,92 22,36 23,07 23,50 23,79 28,93 U C, kv 14,18 22,26 23,35 23,96 24,01 24,58 24,79 27,28 Condition of resistance in neutral transformer - Voltage at un-faulted phases under single-phase short circuit condition : U < 1,4 U nominal Value of fault current : I N > 4. I C (the capacitance current of the grid Calculation the thermal characteristic equipment in case of fault Choice : R R-FCL = 10 Ω 16/11/

16 Simulation Result of load unbalance- one phase grounded condition S 1, KVA I A, A I B, A I C, A I Neutral, A ,3 663,68 663, ,85 672,16 663,69 8, ,65 663,89 674,97 11, ,69 663,7 663, ,96 683,36 663,56 20,94 I phase A, B, C và I Neutral neutral with unbalance load condition - The result of the current in the neutral line when the asymmetric load is 20.94A is consistent with the results of Binh An grid survey - Power loss in neutral line with R 10Ω : 1,12kW R N, Ω I N, A U N, kv U B, kv U C, kv P R, kw 5 4,073 0, ,2 18, ,047 0, ,22 18,22 0, ,428 0, ,23 18,22 0, ,009 0, ,23 18,22 0, ,714 0, , , ,5 0,044 18,237 18,22 0, ,73 0,051 18,24 18,22 0,037 R N, Ω I N, A U N, kv U A, kv U C, kv P R, kw 5 14,21 0,071 18,24 18, ,62 0,106 18,242 18,234 1, ,44 0,126 18,242 18,236 1, ,99 0,139 18,243 18,237 0, ,150 18,245 18,238 0,9 30 5,199 0,155 18,247 18,239 0, ,55 0, ,32 0,453 Kết quả tính toán cho lưới điện với điện trở nối đất trung tính trong điều kiện Kết quả tính toán cho lưới điện với điện trở nối đất trung tính trong điều kiện không đối xứng có phụ tải 0,2MVA (I N,U N :dòng và áp trong dây trung tính) 16/11/2017 không đối xứng có phụ tải 0,7MVA (I N,U N :dòng và áp trong dây trung tính) 16

17 Part 5. Installation and Simulation of Fault current limiters on grid of Binh An transformer 110 kv R-FCL in neutral transformer T2 Parameters of R - FCL Resistance : Ω Rated Voltage : 22 kv The equipment includes 84 resistive elements: 06 parallel rows, each row consists of 07 elements, The resistance value of each element is 17,14Ω. ρ=5,38. 2 Ωm Detailed Dimension of R-FCL Electrical diagram of the elements 16/11/

18 Part 5. Model of R FCL on grid (R = 10 Ω) Simulation model of electrical part R- FCL Model for thermal coefficient Cp of material R-FCL R.i(t) 2.dt = C P (T).V.dT + P echange.s echange.dt (1) Cp is calculated : y= 2,7055e ,8x Cp (J/m3/K) Cp (J/m3/K) y = e x R= Thermal model of R-FCL /11/ T ( K)

19 Part 5. Simulation Power network 22kV of Transformer T2 - Binh An transformer Substation with R-RCL R - FCL 16/11/

20 Part 5. Simulation Power network 22kV of Transformer T2 - Binh An transformer Substation with R-RCL Case of simulation Normal operation mode Fault condition Operation with asymmetric load condition 16/11/

21 Simulation network 22kV - Binh An transformer Substation with R-RCL Normal operation Current in neutral transformer at normal operation condition Temperature of R-FCL, normal operation Normal operation network U A = U B = U C = 18,26kV; Current in neutral transformer I N = 7,9A; compare with value measured 7,92A Temperature of R-FCL doesn t change 16/11/

22 Simulation network 22kV - Binh An transformer Substation with R-RCL Fault N (1) condition 297 K 293 K Current in neutral transformer at fault one line -ground condition Temperature of R-FCL, fault operation Current in neutral wire - simulation (A) Current in neutral wire real value (ka) ,9 Current in neutral transformer at normal operation condition 16/11/

23 Conclusion The project studied the short-circuit current limiting factor on the transmission grid: the state of the transmission grid in Vietnam; Fault current and new element fault current limiters into the grid in a specific way. Calculate and choice the value required of the resistance, by the simulation, comparing with the real power network. Installation the Fault Current Limiter Resistance type in Binh An 110 kv Transformer substation Evaluate the effect on fault current lever reduction by using Resistive FCL on neutral point of transformer. 16/11/

24 Dr. NGUYEN NHAT TUNG 2005 Engineer Study: Neural point connection of transformer substation RESEARCH History 2006 Master France Energy Management in building, EU Project Home 2009 PhD France Fault current limiter superconducting type 2010 Post-doc 1 er : Project ISS2 : diagnostic machine 2 rd : Project SUPER SMES :Optimization of energy storage superconducting 16/11/

25 Dr. NGUYEN NHAT TUNG 1.N.T. Nguyen, P.Tixador, YBCO coatedconductor for fault current limiter: Architecture influences and optical study, Superconductor Science and Technology, Issue 2 (February 2010), doi: / /23/2/ P.Tixador, Y. Cointe, N.T. Nguyen, C. Villard, 2009, Electrothermal phenomena about current limitation with Coated Conductors, IEEE Trans. Appl. Supercond. 19, P. Tixador, N.T. Nguyen, Design of ReBaCuO-Coated Conductors for FCL, IEEE/CSC & ESAS European Superconductivity new forum (ESNF), No. 13, July P. Tixador, T. Nguyen-Nhat, H.G. Okada-Vieira, R. Ponceau, Some Grid Constraints for SC FCL, ASC P. Tixador, N.T. Nguyen, Design of ReBaCuO Coated Conductors for FCL, International Workshop on Coated Conductors Applications (CCA), Barcelona, Spain, Novembre, N.T. Nguyen, C. Barnier, P. Tixador, Optical investigation of the quenching of coated conductors, EUCAS 2009, Karlsruhe, Allemagne. 7.P. Tixador, N.T. Nguyen et C. Barnier, Investigations optiques de la transition de conducteurs déposés supraconducteurs, 5ème Colloque sur les Matériaux en Génie Electrique «MGE 2010», Montpellier, 30/08/ /09/ N.T. Nguyen, P. Tixador, Y. Coint, C. Villard, Thermo Electromagnétique de la limitation du courant par conducteurs déposés YBaCuO, MGE- Toulouse N.T. Nguyen, P. Tixador, Influences de l architecture des conducteurs déposés YBCO sur les problèmes de limitation du courant de défaut, JCGE 2008 Lyon. 10. K. Le, T. Tran-Quoc, N. Hadjsaid, N.T. Nguyen, C. Surdu, JC. Sabonnadière, C. Kieny, Load management by optimizing operations of the radiators, Conference in Innovation for Sustainable Production 2008, Bruges, Belgium, April More papers in Vietnamese journal - domain electric engineering 16/11/

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