The constraint of UC Primary constraint Enough generation output to satisfy the load demand Spinning reserve constraint Definition:interconnected backup generation capacity Functions:protect the power grid when accidental generator tripping Rule:some percent of the predicted load;or,able to supply the deficiency when the generator with maximum output is down;distributed in the network to avoid network congestion. 电力拿镜广城测量乌控制四川省重点实验蜜 家电网
电力系统广域测量与控制四川省重点实验室 The constraint of UC Primary constraint Enough generation output to satisfy the load demand Spinning reserve constraint Definition: interconnected backup generation capacity Functions: protect the power grid when accidental generator tripping Rule: some percent of the predicted load; or, able to supply the deficiency when the generator with maximum output is down; distributed in the network to avoid network congestion
Reserve example Example consider a power system consisting of two isolated regions transmission tie-lines join the regions and may transfer power up 0 to a maximum of 550 MW in either direction five units have been committed to supply 3090 MW of loading Western region Units 1.2&3 andino un (W) (W) (W) (MW)peoT e6ueyoJejul TT 550MW 1 1000 900 100 maximum Western 2 800 420 1740 380 1900 160 3 800 420 380 (in) Eastern region 4 1200 1040 160 1350 160 Eastern 1190 Units 4 5 5 600 310 290 (out) Total 4400 3090 3090 1310 3090 电力康镜广城测量与控渊四川省重点实验蜜 家电顺
电力系统广域测量与控制四川省重点实验室 Reserve example
Reserve example Example verify the allocation of spinning reserves in the system ●western region generation of largest unit:900 MW available spinning reserve local:760 MW;tie-line capacity:390 MW;eastern region:450 MW total:1150 MW load can be supplied ·eastern region generation of largest unit:1040 MW available spinning reserve local:450 MW;tie-line capacity:550 MW;western region:700 MW total:1000 MW-load can not be completely supplied lack 40 MW of spinning reserve in the eastern region commit 40 MW of new generation within the eastern region 是人W乐网翼溪别w国氢马大烈鉴 国家电网
电力系统广域测量与控制四川省重点实验室 Reserve example
Constraint of UC Constraint of thermal plant Time constraints:slow heat effect->may take some time from startup->minimum startup or shutdown time Crew constraints:cannot start up or shut down multiple generators Startup cost (heat start and cold start) C tart-up cooling 1-e d break-even banking point Coank-Hbamk!shut-dow+ fixed 0十十十十十十十 电力集院广为 01234567hm Time-dependent start-up costs
电力系统广域测量与控制四川省重点实验室 Constraint of UC Constraint of thermal plant Time constraints: slow heat effect -> may take some time from startup -> minimum startup or shutdown time Crew constraints: cannot start up or shut down multiple generators Startup cost (heat start and cold start)