A Coordinated Optimization Method for Multi-machine PSS Parameters in Multiple Operating Modes

Abstract

The invention discloses a multi-machine PSS parameter coordination and optimization method under multi-operation mode. First, the operation mode of the system is determined, and then the comprehensive evaluation index of the input signal of PSS under multi-operation mode is obtained according to trajectory sensitivity and principal component analysis, and Select the signal with a larger evaluation index as the input signal of PSS; then carry out pattern recognition on the system to select the key unit, and extract the fault characteristics of the key unit, use the extracted fault characteristics combined with the ITAE criterion and Taguchi method to construct the robustness target and The stability objective is used to construct a multi-objective optimization algorithm; finally, the iterative optimization of PSS is performed according to the constructed multi-objective optimization algorithm, and the best parameters that satisfy the system stability and robustness under multiple operating modes are obtained. The invention realizes global parameter optimization under multiple machines and multiple operation modes in the transient process of the system, improves the ability of the power system stabilizer to suppress oscillation, and enhances its robustness under various operation modes.

Description

technical field [0001] The invention belongs to the technical field of power grid safety and stability control, and more specifically relates to a multi-machine PSS parameter coordination and optimization method under multi-operation mode. Background technique [0002] The Power System Stabilizer (PSS) is a key device for suppressing unit oscillation and providing additional damping in modern power systems. At present, the configuration principle of PSS is mainly based on the small disturbance stability theory of power structure parameters, and the local signal is selected to form a feedback control loop. This kind of PSS parameters based on single-unit infinite system configuration ignores the interaction between generators. In complex power systems, sometimes it will worsen the damping of the system and aggravate the oscillation of the system. Therefore, the problem of parameter coordination and optimization of multi-machine PSS in complex systems needs to be developed in...

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Problems solved by technology

Therefore, some scholars propose to optimize the PSS parameters based on the transient state, and transform the PSS parameter optimization problem into the optimization problem of the generator rotor oscillation mode, but the shortcoming of this method is that it does not consider the robustness of the parameters after the operation mode changes question

Moreover, in the previous research on PSS parameter optimization, the optimization of PSS input signal was ignored, and the optimization effect could not reach the best.

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