Optimization method of pi parameter of wind turbine converter for subsynchronous oscillation suppression

Abstract

A method for optimize PI parameters of wind turbine convert for suppressing subsynchronous oscillation features that integral coefficient Ki of inner loop PI controller of wind turbine convert is obtained, and that PI parameter Ki of inner loop PI controller is obtained; obtaining the optimal PI parameter trajectory slope. The proportional coefficient Kp of the inner loop PI controller is obtainedby the optimal PI parameter trajectory slope. Proportional coefficient Kp is verified. If the proportional coefficient Kp satisfies the verification condition, it ends; If the proportional coefficient Kp does not satisfy the verification condition, then returning to step 1, the integral coefficient Ki of the inner loop PI controller is adjusted until the proportional coefficient Kp satisfies theverification condition. The invention has the following beneficial effects: the invention is simple and easy to realize, and is suitable for the optimization design of PI parameters of the wind turbine generator system converter. The damping of subsynchronous oscillation can be effectively improved and the occurrence of subsynchronous oscillation can be avoided. The general flow of PI parameter optimization design of converter is presented, and the simulation of specific system is not needed, which simplifies the flow of PI parameter optimization design.

Description

technical field [0001] The invention relates to the field of safety and stability of electric power systems, in particular to a method for optimizing PI parameters of a converter of a wind turbine for subsynchronous oscillation suppression. Background technique [0002] In recent years, with the rapid development of wind power large-scale centralized development and utilization, many subsynchronous oscillation (SSO) events have occurred in engineering practice, and subsynchronous oscillation has become a wind power grid-connected stability issue that has received special attention. In 2009, due to the interaction between a wind farm and the series compensation capacitor on the sending line, the wind turbine was shut down and the crowbar circuit was damaged. This is the first new energy-induced subsynchronous oscillation accident reported in the world. In 2011, a group of wind farms also had several unplanned downtime accidents of multiple wind turbines caused by subsynchrono...

AI Technical Summary

Problems solved by technology

In 2009, due to the interaction between a wind farm and the series compensation capacitor on the sending line, the wind turbine was shut down and the crowbar circuit was damaged. This is the first new energy-induced subsynchronous oscillation accident reported in the world.

PI parameters are greatly affected by the system, and the design of PI parameters through simulation can only guide the design of PI controller parameters for a specific system, and cannot adapt to frequent changes in the power system, making it difficult to apply in actual engineering

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