OPTIMAL REACTIVE POWER PLANNING, PART I—LOAD LEVEL DECOMPOSITION

Abstract

This paper presents an efficient algorithm for the reactive power planning of transmission networks in nonaal operations. In order to obtain optmal investment planning an optimal operation is essential. The objective function of an optimal operation is the fuel cost of the generators. The investment variables are the shunt reaciors and the capacitors at selected buses. The operation proble. contains every physical constraint such as voltage laits, generators' capacities and Var campensators' capacities. The number of operation modes is so large because of the various load levels in a year. So the variables are increased tremendously, in proportion to the load levels and the investment variables. This leads to difficult camputation and to a storage limit. To overcome these difficulties a new variable decomposition technique is adopted which can seperate the operation and the investment variables. This technique makes it possible to decompose load levels and to solve optimal operation problems independently in each level. Therfore the only problem remaining to be solved is the investment problem. The modified investment problem includes implicitly the operation and the operation problem needs no longer to be computed. The quasi linearization method is applied to each probles and so computing time is reduced in a great deal.