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Optimal Voltage Level Control and Its Application to Long Range Extension Planning in High Voltage Transmission Network

机译：最优电压等级控制及其在高压输电网远程扩展规划中的应用

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The work deals with the basic computer algorithms and their application long range network planning. The full a.c. load flow is calculated for every network state. Estimation for losses in each network state is obtained by performing a voltage level optimization routine. It finds the generator voltages, tap changer position and shunt compensation connections such that the losses are minimized simple method based on direct search was selected due to the significant mount of shut compensation equipment in the Finnish network that make the variables discontinuous. Losses are linearlized and expressed as a function voltage magnitude only. Sensitivity matrix is used to calculated these voltage changes. The inherently great need of computer storage to store this matrix and the long time to prepare it were overcome by assuming that small reactive power changes do not disturb the active power balance. This small approximation causes an error that is smaller than 1% but gives the benefit that the sensitivity matrix can be factorized and stored in a similar way to the Jacobia matrix used in load flow calculation. The optimization method has been proved to be feasible and fast in relatively large networks. It is in daily practical use at a utility. Numerical examples demonstrate the effect of corona losses on the optimal voltage level.

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