Lecture 10 Power System Security Dr.QI Huang School of Energy Science and Engineering,UESTC
Lecture 10 Power System Security Dr. QI Huang School of Energy Science and Engineering, UESTC
Contents Introduction Secure state ■ Security analysis-linear sensitivity analysis method 电力拿镜广城洲量写控制四川省重点实验蜜 家电
电力系统广域测量与控制四川省重点实验室 Contents Introduction Secure state Security analysis-linear sensitivity analysis method
Introduction Power system not only needs to be economic, but more needs to be secure. System security:the system can continue to be in normal operation state after some devices get faulted. How to guarantee (enhance)system security? o Reserve Enhance the reliability of the devices Operator's decision making 电力拿镜广城洲量写控制四川省童点实验蜜 家电
电力系统广域测量与控制四川省重点实验室 Introduction Power system not only needs to be economic, but more needs to be secure. System security: the system can continue to be in normal operation state after some devices get faulted. How to guarantee (enhance) system security? Reserve Enhance the reliability of the devices Operator’s decision making
Introduction System security has three functionalities: 口系统监视(System Monitoring.) 口预想事故分析(Contingency Analysis.) ▣考虑安全约束的最优潮流(Security-constrained optimal power flow) 电力康镜广城测量与控制四川省重点实验蜜 家电
电力系统广域测量与控制四川省重点实验室 Introduction System security has three functionalities: 系统监视（System Monitoring） 预想事故分析（Contingency Analysis） 考虑安全约束的最优潮流（Security-constrained optimal power flow）
Introduction System monitoring Voltage,current,power flow,breaker status,switch status; frequency,generator output,tap changer,etc. SCADA,state estimation Contingency analysis: Perform analysis of possible faults beforehand,and then make plans for outages,or alert when the outages are to be occuring Security constrained OPF Optimal dispatch ▣Post-fault analysis Secure dispatch Post-fault security 电力镜广城测量乌控制四川省重点实验蜜 家电
电力系统广域测量与控制四川省重点实验室 Introduction System monitoring Voltage, current, power flow, breaker status, switch status; frequency, generator output, tap changer, etc. SCADA, state estimation Contingency analysis: Perform analysis of possible faults beforehand, and then make plans for outages, or alert when the outages are to be occuring Security constrained OPF Optimal dispatch Post-fault analysis Secure dispatch Post-fault security
Secure states Illustration of states ◆optimal dispatch ignoring losses maximum line loading of 400 MW 700MW 500MW 250MW 250MW unit #2 unit #1 ◆post contingency 1200MW consider that a transmission line has opened because of a failure 700MW 500MW Ma入( →500MW unit #2 unit #1 (overload) 1200MW 家电
电力系统广域测量与控制四川省重点实验室 Secure states
Secure states Illustration of states the overload line may cause a cascaded outage secure dispatch unit #1 generation set to maximum secure line loading of 400 MW 800MW 400MW 200MW 200MW unit #2 unit #1 ◆post contingency 1200MW consider the same contingency,resulting in no violations 800MW 400MW →0MW unit #2 unit #1 1200MW 家电
电力系统广域测量与控制四川省重点实验室 Secure states
Secure states By adjusting the output of G1 and G2 before the outage occurs,avoiding the overloading when outage occurs---the meaning of security! ■ The analysis tool for taking measures to avoid overloading after outages is SCOPF Due to some large blackout in interconnected power network,the priority in operation is defined: Power is reliably delivered In the range of reliability,try to make the system as economic as possible No power system is 100%secure,simply because it is not economic! 电力拿镜广城洲量写控制四川省童点实验蜜 家电网
电力系统广域测量与控制四川省重点实验室 Secure states By adjusting the output of G1 and G2 before the outage occurs, avoiding the overloading when outage occurs---the meaning of security! The analysis tool for taking measures to avoid overloading after outages is SCOPF Due to some large blackout in interconnected power network, the priority in operation is defined: Power is reliably delivered In the range of reliability, try to make the system as economic as possible No power system is 100％ secure, simply because it is not economic!
Example #10.1 ◆base case Bus2 Bus 3 50.0MW→ 241.5kV1-3.7° 246.1kV/-4.3°←-60.0MW 74.4VAR 2.9MW 2.9MW → 89.6 MVAR 12.3 MVAR 5.7 MVAR 33.1MW← 26.2MW 46.1VAR+ +>12.4MVAR 43.8 MW 19.1MW 27.8MW 60.7 MVAR +>23.2MVAR 5.5MW 12.8 MVAR 15.4 MVAR 42.8MW-→ >70 MW 107.9MW→ 57.9 MVAR> 70 MVAR Bus 6 16.0 MVAR> 28.7MW 25.7MW 231.0kV/-5.9° 15.4 MVAR 16.0MVAR十> 1.6MW Bus4 3.9 MVAR Bus 5 227.6kV 35.6MW /-4.2° 15.0MW 226.7kV/-5.3° →1.6MW 古451N 31.6MW 20.1 MVAR+Bus 1+>11.3 MVAR 241.5kV/0° 18.0 MVAR 9.7 MVAR 42.5MW 34.5MW 18.0MW 19.9 MVAR IB5MVAR+ 26.1 MVAR 4.1MW 4.0MW 70MW←- 70 MW 4.9 MVAR 70 MVAR 2.8 MVAR →70MVAR 家电网
电力系统广域测量与控制四川省重点实验室 Example #10.1
Line 3-5 open: Example #10.1 (con Line3-6 load increase to 54.9MW;other lines are affected to some degree ◆line outage3o.oww→2415kv1-34e Bus 2 Bus 3 246.1kV/-3.0°←-60.0MW 91.2 MVAR ←-5.1MW 5.1MW← 68.7 MVAR +10.7VAR 4.1 MVAR 37.3MW 22.9MW 49.1MVAR← >16.2 MVAR 54.9MW 0 MW 26.0MW 64.6 MVAR 0.9 MW 11.8 MVAR 》 24.7 MVAR 53.6MW→ 70 MW 70 MVAR 108.5MW→ 60.3 MVAR> ☐+Bus6 29.8MVAR+> 26.8MW 22.3MW 229.8kV/-5.2 14.6 MVAR 19.9MVAR+> 5.9MW Bus4 10.2 MVAR Bus 5 226.4kV 43.2Mw 38.5MW /-4.1° 22.7 MVAR+Bus 1+>21.7 MVAR 19.9MW 219.3kV/-5.5° ←-5.7MW 35.5MW 25.6 MVAR 47.6 MVAR 241.5kV/0° 15.3 MVAR 42.1MW 37.0MW 0 MW 22.3 MVAR 22.0MVAR+> 0 MVAR 7.6MW 7.4MW 70MW← 70 MW >0.0 MVAR 70 MVAR 7.2 MVAR >70 MVAR ®刀黑税厂频测重与覆雨四川酒夏夏买验重 围家电网
电力系统广域测量与控制四川省重点实验室 Example #10.1（cont.） Line 3-5 open： •Line3-6 load increase to 54.9MW; other lines are affected to some degree