Abstract
The paper proposes method and algorithm for obtaining the maximum transmitted power limit in the power system under the voltage stability conditions in case of emergency outages of its elements - power lines and generating sets. The method is based on the analysis of the exaggerated states of the system created by increasing the values of the power sources (generators of power plants). The model of system states in extreme modes is described in the form of “extreme transmitted power – generating power values” relationships. The efficiency of the method is investigated on IEEE test schemes and the real Azerenergy system scheme. A comparison of the proposed method results with the evaluation of the critical conditions on the basis of trained neural network is presented.
Highlights
The emergency outages of main elements happened in modern power systems – generating units, power lines and transformers, as a result of limiting the possibilities of transit of large powers through transmission networks, lack of generation powers, corrosion of equipment and other factors
Taking into account the existing state formed in the power system and frequent emergency outages of its components, there is a need to strengthen the requirements for voltage stability
The methods of increase of the consumed power of the load and the system mode exaggeration were investigated, these methods allow for determining the number and power of sources involved in the mode exaggeration, but can not be used in multi-machine systems
Summary
The emergency outages of main elements happened in modern power systems – generating units, power lines and transformers, as a result of limiting the possibilities of transit of large powers through transmission networks, lack of generation powers, corrosion of equipment and other factors. PGi max lower and upper generated voltage limits in the node i respectively; Pij ,Qij , Sij active, reactive and total powers in ij line respectively In this method, the exaggeration value is determined in the form of the difference between the optimal value and the originally defined values. The values of the coefficients of approximating polynomials, which are given, represent the curves in Fig. in the following form: These polynomials are used to describe the spatial state surface of the system in the case of 3 and 4 generators involved for the subsequent control of the power balance mode in the system.
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