Coordinated optimization method for multi-machine PSS parameters under multiple operation modes

Abstract

The invention discloses a coordinated optimization method for multi-machine PSS parameters under multiple operation modes. The method comprises the steps of firstly determining operation modes of a system, calculating comprehensive evaluation indexes of input signals of each PSS under multiple operation modes according to the trace sensitivity and principal component analysis, and selecting the signal with the relatively large evaluation index as the input signal of the PSS; carrying out mode recognition on the system to select out key units, extracting fault characteristics of the key units,and constructing a robustness objective and a stability objective by using the extracted fault characteristics and combining an ITAE criterion with a taguchi method, thereby constructing a multi-objective optimization algorithm; and finally carrying out iterative optimization of each PSS according to the constructed multi-objective optimization algorithm to obtain the optimum parameter meeting thestability and the robustness of the system under multiple operation modes. According to the coordinated optimization method, global parameter optimization of the transient process of the system undermultiple machines and multiple operation modes is achieved, the oscillation suppression capacity of the power system stabilizers is improved and the robustness under the multiple operation modes is strengthened.

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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