The System Angle Instability Reduction in Transmission System of Northeastern Region of Thailand Poom Phogun, Short-Term Transmission System Study Section, Transmission Operation Planning Department, Power System Control and Operation Division. การไฟฟ าฝ ายผล ตแห งประเทศไทย ผล ตไฟฟ าเพ อความส ขของคนไทย 1
Outline Ø Introduction Ø Situation & Operation Approach Ø Development Plan Ø Conclusion 2
Outline Ø Introduction Ø Situation & Operation Approach Ø Development Plan Ø Conclusion 3
Northeastern region of Thailand Area 20 provinces 160,000 sq.km. Connection - Laos - Cambodia - Northern of Thailand - Central of Thailand 4
Import Power from Hydro Power Plants in LAOS Nam Ngum2 (NNG2-H: 615 MW) Theun Hinboun (THB-H: 434 MW) Nam Theun2 (NTN2-H: 960 MW) Houay Ho (HHO-H: 126 MW) Transmission system in Northeastern region of Thailand NAM NGUM 1 NAM LEUK PAKX KHON AN SONG NAXAYTHO NAM NGUM THEUN NG BUNG KAN 2 PHON THAKH HINBOUN 115 kv KOKSA AT BAN TONG EK NONG THA NA DUNG NA BONG NAKHON 230 kv PHANOM NAKHON 2 500 kv KHAI UDON LENG NONG THAKH PHANOM EK LOEI THANI 1 HAN SAKON UDON THANI NAKHON 2 NAM NONG BUA LAM 2 SAKON THEUN 2 PHU UDON THANI PHANG NAKHON 1 THAT LOM SAK NAM 3 KHON NAM PHANOM PAKBO PHONG NAM SOM PUNG MUKDAH CHUM UBOLRATA PHONG 1 DET ROI ET PHAE KALASI AN 2 NA 2 MUKDAH N ROI ET SIRINDHOR AN 1 KHON KAEN KHON N PHON 3 KHON KAEN MAHA 2 THONG YASOTHON BAN KAEN 1 SARAKHAM THA AMNAT CHAIYAPHPHA PHAYAKKHAPHUM TAKO PH CHAROEN UM PHISAI KHON ON UBON RATCHATHANI PAK 1 BAMNET SI SA G MUN NARONG KET NAKHON BURIRASURI UBON HOUAY PAK CHONG SIKHI RATCHASIMA 1 M N 1 RATCHATHANI 2 HO SIKHI U SURIN SIRINDH BAN U 2 NAKHON PRA KHON 2 KANTHARALA ORN GYO RATCHASIMA 2 CHAI SANG K 5 LAM NAKHON KA
Transmission system in Northeastern region of Thailand Simplify 615 MW 434 MW NNG2-H THB-H KK3 NTN2-H 960 MW CYP HHO-H 126 MW 6
Transmission system in Northeastern region of Thailand Length of transmission lines Operation Division Voltage Level Number of Substation Substation Transformer Capacity (MVA) Transmission Length (cct.-km.) 500 kv 1 2,000.00 320.398 Northeastern 230 kv 15 6,600.00 2,681.684 115 kv 36 3,918.00 5,870.230 Sum 52 12,518.00 8,872.312 7
Transmission system in Northeastern region of Thailand System Electricity Consumption 8.21% 8.71% 10.90% 36.45% 35.74% Metro. Central Northeastern Southern Nothern Remark: - System Consumption = 27,345.8 MW at Jun 11, 2015 8
Transmission system in Northeastern region of Thailand Maximum Electricity Consumption Statistics Requirement (MW) 4,000 3,800 3,600 3,400 3,200 3,000 2,800 2,600 2,400 2,835 2,892 3,181 3,346 3,211 3,363 3,625 3,739 3,857 3,978 2,200 2,000 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 Year Remark: 1. Average growth rate = 3.15% per years 2. Minimum consumption = 35%-40% of maximum consumption 9
Outline Ø Introduction Ø Situation & Operation Approach Ø Development Plan Ø Conclusion 10
Angle instability in transmission lines 115 kv : 11 routes 230 kv : 7 routes 500 kv : 1 routes System angle instability on 19 transmission lines NAM NGUM NAM LEUK 1 PAKX KHON AN SONG NAM NAXAYTHO NGUM 2 THEUN NG BUNG KAN HINBOUN PHON THAKH KOKSA AT BAN TONG EK NONG THA NA DUNG NA BONG NAKHON PHANOM NAKHON 2 KHAI UDON LENG NONG THAKH PHANOM EK NAM LOEI THANI 1 HAN SAKON UDON THANI NAKHON 2 THEUN 2 NONG BUA LAM 2 SAKON PHU UDON THANI PHANG NAKHON 1 THAT LOM SAK NAM 3 KHON NAM PHANOM PAKBO PHONG 2 NAM SOM PUNG MUKDAH CHUM UBOLRATA PHONG 1 DET ROI ET PHAE KALASI AN 2 NA 2 MUKDAH N ROI ET SIRINDHOR AN 1 KHON KAEN KHON N PHON 3 KHON KAEN MAHA 2 THONG YASOTHON BAN KAEN 1 SARAKHAM THA AMNAT CHAIYAPHPHA PHAYAKKHAPHUM TAKO PH CHAROEN UM PHISAI KHON ON UBON RATCHATHANI PAK 1 BAMNET SI SA G MUN NARONG KET NAKHON BURIRASURI UBON PAK CHONG SIKHI RATCHASIMA 1 M N 1 RATCHATHANI 2 SIKHI U U 2 SURIN SIRINDH NAKHON PRA KHON SARABURI 2 2 KANTHARALA ORN RATCHASIMA 2 CHAI SANG K LAM NAKHON KA HOUAY HO BAN GYO 11
Generator in Northeastern Region! NPO-C, THB-H, NNG2-H, NTN2-H Generator in other Region! RB-C, MM-T The angle of the rotor when the power plant was the source of the 3 Phase Fault transmission line 230 kv Chaiyaphum-KhonKaen3 and Trip out. Power Angle Instability! Unstable! 12
Voltage at substation in Northeastern Region! BPI, KK3, CYP, KNG, PO, NR2 Voltage 3 Phase Fault on the bus and the source of the transmission line 230 kv Chaiyaphum-KhonKaen3 and Trip out. Voltage Instability! Unstable! 13
Result of Transient Stability when Fault is Applied on Transmission line Generation Dispatch (MW) CYP-KK3 (%) Transient Stability Study Result in case of Fault at Sending of Transmssion Line and Trip 1 crcuit 230 kv KK3-CYP 230 kv KK3-NPO2 500 kv NTN2-RE2 115 kv KK1-NPO1 NPO NTN2 NNG2 3P SLG 3P SLG 3P SLG 3P SLG Full Generation 6x110 4x240 3x205 95 û û û ü û ü û ü Reduce Generation NPO 3x110 4x240 3x205 79 û ü û ü û ü û ü 5x110 4x240 3x205 88 û ü û ü û ü û ü 4x110 4x240 3x205 81 û ü û ü û ü û ü Reduce Generation NTN2 6x110 4x210 3x205 92 û û û ü û ü û ü 6x110 3x240 3x205 85 û ü û ü û ü û ü Reduce Generation NNG2 6x110 4x240 3x180 95 û û û ü û ü û ü 6x110 4x240 2x205 87 û ü û ü û ü û ü 14
Result of Transient Stability when Fault is Applied on Transmission line Generation Dispatch (MW) CYP-KK3 (%) Transient Stability Study Result in case of Fault at Sending of Transmssion Line and Trip 1 crcuit 230 kv KK3-CYP 230 kv KK3-NPO2 500 kv NTN2-RE2 115 kv KK1-NPO1 NPO NTN2 NNG2 3P SLG 3P SLG 3P SLG 3P SLG Reduce Generation NNG2 and NTN2 6x110 4x210 3x180 88 û ü û ü ü ü û ü 6x110 3x200 2x205 64 ü ü ü ü ü ü ü ü 6x110 4x210 1x205 68 ü ü ü ü ü ü ü ü Reduce Generation NPO and NTN2 5x110 4x210 3x205 85 û ü û ü û ü û ü 4x110 3x200 3x205 62 ü ü ü ü ü ü ü ü 3x110 3x240 3x205 58 ü ü ü ü ü ü ü ü 5x110 3x200 3x205 64 ü ü ü ü ü ü ü ü Reduce Generation NPO and NNG2 5x110 4x240 3x180 88 û ü û ü û ü û ü 4x110 4x240 3x180 81 û ü û ü û ü û ü 4x110 4x230 2x205 65 ü ü ü ü ü ü ü ü 5x110 4x240 1x205 62 ü ü ü ü ü ü ü ü 15
Operation Guideline 1) Control power flow on 230 kv Chaiyaphum-KhonKaen3 transmission line to be less than 65% - prevent the system angle instability. (prevent all type of fault) to be less than 90% reduce the risk of the system angle instability. (only single phase fault) 2) Install generation shedding scheme - used as backup protection when fault occurs. 3) Install overload line scheme - to mitigate the overloaded remaining line in case there is an N-1 event on transmission line. 16
Outline Ø Introduction Ø Situation & Operation Approach Ø Development Plan Ø Conclusion 17
Construction 500 kv & 230 kv Transmission System NAM NGUM 1 NAM LEUK PAKX KHON AN SONG NAXAYTHO NAM NGUM THEUN NG BUNG KAN 2 PHON THAKH HINBOUN KOKSA AT BAN TONG EK NONG THA NA DUNG NA BONG NAKHON PHANOM NAKHON 2 LOEI KHAI UDON LENG NONG THAKH NONG BUA PHANOM THANI LAM 1 HAN SAKON EK UDON THANI NAKHON 2 NAM THEUN 2 500 kv CYP2-UD3 PHU 2 2 SAKON PHANG THAT Circuits NAKHON 1 LOM SAK NAM UDON THANI KHON NAM PHANOM PAKBO PHONG 2 NAM 3 SOM PUNG MUKDAH CHUM UBOLRATA PHONG 1 DET ROI ET PHAE KALASI AN 2 NA 2 MUKDAH N ROI ET SIRINDHOR AN 1 KHON KAEN KHON N PHON 3 KHON KAEN MAHA 2 CHAIYAPH THONG YASOTHON THA UM 2 BAN KAEN 1 SARAKHAM AMNAT PHAYAKKHAPHUM TAKO CHAIYAPH PHA PH CHAROEN KHON230 kv PHISAI UM ON CYP-CYP2 2 UBON RATCHATHANI PAK 1 BAMNET SI SA G Circuits MUN NARONG KET NAKHON BURIRASURI UBON 500 kv TTK-UD3 2 PAK CHONG SIKHI RATCHASIMA 1 M N 1 RATCHATHANI 2 SIKHI Circuits U SURIN SIRINDH BAN U 2 NAKHON PRA KHON SARABURI 2 2 KANTHARALA ORN GYO RATCHASIMA 2 CHAI SANG K LAM NAKHON 18 18 RATCHASIMA 3 KA HOUAY HO
Outline Ø Introduction Ø Situation & Operation Approach Ø Development Plan Ø Conclusion 19
Conclusion Ø In normal condition - Operate less than or equal to 85%. Ø In case of natural gas or other fuel shortage - Operate less than or equal to 100%. Ø Allow installing generation shedding scheme - used as backup protection when fault occurs. (maximum of 2 units or 500 MW) Ø Allow installing overload line scheme - to mitigate the overloaded remaining line in case there is an N-1 event on transmission line. 20
Thank you for your Attention การไฟฟ าฝ ายผล ตแห งประเทศไทย ผล ตไฟฟ าเพ อความส ขของคนไทย 21
Operation Guideline 615 MW 434 MW NNG2-H THB-H KK3 NTN2-H 960 MW CYP <729 MVA (85%) HHO-H 126 MW 22
Powe r Flow on 230 kv KK3- CYP Genera tor Status AREV A (calc ulatin g and sendi ng signa l Preselec t to contr ol box) Apply Generation Shedding Scheme Breaker Trip s signal of transmission line 115 kv KK1-BPI, KK1-KNG, KK1- CPA, KK1-KK2, KK1-MK, KK1-NPO1, Breaker Trip s KK1-UR signal (from of transmission 115 kv KK1) line 115 kv NPO1-NPO2, NPO1-UD1, NPO1-UD2, NPO1-UR (from Breaker 115 Trip s kv NPO1) signal of transmission line 230 kv KK3-CYP, KK3-LS, KK3- KK1, KK3-NPO2, KK3-RE2 Breaker (from 230 Trip s kv signal KK3) of transmission line 230 kv UD3-NBG, UD3-NPO2 (from Breaker 230 Trip s kv UD3) signal of transmission line 500 kv NTN2 RE2 (from 500 kv RE2) DT T DT T DT T DT T Communication Signal Contr ol Box at 230 kv KK3 DT T DT T NAM NGU M 2 NAM THEU N 2 ส ญญาณ 23
Example of Generation Shedding Scheme 24