Robust Coordination Method for Statcom and Excitation Based on Two-Parameter Adaptation

Abstract

The invention discloses a STATCOM and excitation robust coordination method based on two-parameter self-adaption, and the method comprises the steps: firstly building a four-order mathematic model ofan uncertain two-parameter and unknown-disturbance STATCOM and generator excitation coordination control system; designing a two-parameter adaptive estimation law for the uncertain parameters by adopting an immersion and invariant adaptive algorithm; and finally, deriving a generator excitation control law uf and a control law us of the STATCOM by combining the obtained two-parameter adaptive estimation law and a backstepping method, designing a robust coordination controller, constructing an energy function of disturbance input according to an L2 gain robust control method, and proving that the designed coordination control method can ensure that the system has robust suppression capacity through a dissipation theory, thereby achieving the excitation coordination control over the static synchronous compensator and the generator. According to the method disclosed by the invention, two parameters can be estimated at the same time in the aspect of parameter self-adaptation in the system,and the convergence rate and the estimation precision of parameter estimation are superior to those of a traditional backstepping method.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a dual-parameter self-adaptive STATCOM and excitation robust coordination method. Background technique [0002] At present, the scale of my country's power grid is getting bigger and bigger and the power grid system is more complex. The power transmission system has developed into a large-capacity, long-distance, and ultra-high voltage power transmission form. The stability of its power system has become increasingly prominent, and the use of flexible alternating current transmission (FACTS) devices can solve practical problems in engineering more quickly and effectively. Static synchronous compensator (STATCOM), as a main FACTS device, has significant advantages, the most prominent ones are low loss, stable voltage, adjustable power, and improved power system transient stability. The generator excitation system is one of the most mature systems of all power sy...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a STATCOM and excitation robust coordination method based on dual-parameter self-adaptation, which solves the problem that multiple parameter uncertainties and unknown disturbances in the STATCOM and generator excitation coordination control system affect the stability of the power system Problem, compared with single-parameter self-adaptation, the two-parameter self-adaptive identification of the present invention has higher precision and stability

Images