No.4(Ser.No.45) POWER SYSTEM TECHNOLOGY November 1990 CONTENTS The Large Scale System Decomposition-Coordination Methodology for Stochastic Long Term Optimal Operation of Interconnected Multires- ervoir Power Systems……Yang Rui (1) Abs.Using decomposition-coordination theory to optimize the ope- ration of large interconnected multireservoir power system,is a new attempt for stochastic long term multireservoir optimization.The ex- pected value of system generation costs can be minimized by using hydro resource fully taking into account various constraints of hydrothermal system.As a result,this method can provide the various multireservoir schedules (include optimal schedule)and de- monstration reports for policymaker and user. Research on Power System Real-Time Economic Dispatch and Fre- quency Control…Zh知Ruiyun（7) Abs.According to the practical situation of our country,an algo- rithm which implements automatic generation control with real-time ED is presented.the ED calculation method based on Lagrangian equa- tion is improved so that the computation time is reduced.In order to improve the security and reliability of generation control,some refinements have heen added to the generation control program. An Approach of Optimal Power Flow and Reactive Power Optimizat;on ……n…wt…Zhu Taixiu (13) Abs.The classical optimal power flow and reactive power optimi- zation problem is solved by an explicit approach which is based on Newton method,quadratic penalty function method and active set method.Solution effort is approximately proportional to network size, and is relatively independent of the number of controls.The program package has many functions,and has become a necessary tool for power system optimization analysis. Study of Voltage Stability for Extra-High Voltage Power System...... ……………………Lia Liping (17) Abs.This paper introduces the basic concepts related to voltage stability sensitivity and margin criteria of voltage stability.The method to calculate the system reactive power margin is presented by combining load flow program with sensitivity analysis technique. Finaly,the influence of voltage phase angle and reactive compensa- C1994-2011 China Academic Journal Electronic Publishing House.All rights reserved.http://www.cnki.net犷E R S Y S T E M T E C H N O L O G Y N 6 。 4 ( S 七r . N b . 4 5 ) N o ve m b 吧r 1 9 9 0 , . 、 C O N T E N T S T h e L ar , S e曰e S y .t em D e e om 种 s抚拍n 一 oord加吐玉。” M et h o d o l o g y f o r S t o 七h 。氏 L叨9 T en . o p长口La l o pe r a ti o n of 玩加rco n 二e c t e d M u 】石比e s - ~ 。扮 P O wer s y .t e注n s 二” · ” · · · · · ·· · · · · “ · · · · · · · ·· · . 一 “ · · · ” · · ” ·· 一Yang R垃 ( 1 ) A b s. U s in g d eeo m PO siti皿~ ordjn ati叨 th eo ry to oPtim ize the o Pe - rati on of l arge int ereonneeted m ulti reservoi r PO w er sy stem , 1 5 a n e w a t t e m P t fo r s t o e h a s t i e ] o n g t e r m m u j t i r e s e r vo i r o Pt i m i z a t i o n . 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T he 声 。岁a爪 P ae k ag e h as m 阴y funoti on s, . a n d h a s 】犯c o m e a n ee e s sa r y t o o l f o r po w e r s y s t e m o P t im i z a t i皿 ana]y si s · S 加d y of V o lt 昭 e St abUity for Extr , H 馆h V o】t昭 e Po挑 r s了s t em … … · ” ·· · “ · ” · “ · · · · ” · · · · “ · · · · · · · ·· · · · · ” · “ · “ · · · · ·· · “ · ” “一 “ · “ · “ · ” · · ” … L 饭 L i成ng (17) A b ‘ . T h i s Pa p 吧r i n t r o d u e e s t h e b a s i e e on e e P t s r e l a t 七d t o v o lt a ge s t a b i ]i t y s e n s it i v i t y an d m a r g i n e r i t e r i a o f v o ]t a g e s t a b i ]i t y . T h e m e t h od t o e a ] e u l a t e t h e s y s t e m r e a e t i v e po w e r m a rg i n 1 5 Pl e s e n t ed by e o m b i n i n g I o a d f l o w Pr o g r a m w it h s 姐 sitivity 皿 aly si s teehn iq ue. f inaly , t h e in f l u e u e e o f v o l t a g e P h a s e a n g l e a n d r e a e t 行e eo m P e皿 s a 一 户寸