Comprehensive optimization method for economy and static security of power system containing a UPFC

Abstract

The invention discloses a comprehensive optimization method for economy and static security of a power system containing a UPFC. The security of the system is superior to the operation economy of thesystem, so that the optimization process of the method is divided into inner and outer layers, the operation cost of the system is adopted by the outer layer as an objective function, an static security index of the system is adopted by the inner layer as the objective function, and the inner and outer objective functions are connected in a manner of adding a penalty term. N-1 static security constrains of the system are considered; and the UPFC has multiple power flow control modes and different modes have different responses when a security failure of the system occurs, so that selection ofthe control modes of the UPFC is throughout the whole optimization process. Solving is carried out by adopting a particle swarm algorithm, objective function values of the inner layer under differentcontrol modes of the UPFC are calculated for each generation of individuals and the optimal control parameter and control mode of the UPFC are selected, so that the calculation result shows that the operation economy and the static security of the system can be obviously improved by the method.

Description

technical field [0001] The invention relates to the field of power system safety and control, in particular to a comprehensive optimization method for economy and static safety of a power system containing UPFC. Background technique [0002] With the development of flexible AC transmission system (FACTS) technology, more and more power electronic transmission equipment has been applied to the power system, quietly changing the transmission mode of the traditional power system. Unified Power Flow Controller (UPFC) is a typical representative of FACTS equipment. It has the ability to control line flow, stabilize bus voltage, and improve system stability. It has powerful functions and provides a new control and adjustment method for the operation of power systems. At the same time, with the continuous development of the power system, the economy and safety of the power system are becoming more and more important. In order to make more reasonable use of the existing power transm...

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Problems solved by technology

Therefore, the UPFC control mode will have an impact on the security of the system. The existing research on UPFC optimization is generally based on the UPFC constant power control mode, and only optimizes the control objectives and control parameters of the UPFC in the constant power mode, while other Insufficient consideration of the situation of the three control modes

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