Harmonic elimination equipment of island-mode open-winding doubly-fed wind power generation micro-grid system

Abstract

The invention relates to harmonic elimination equipment of an island mode open winding doubly-fed wind power generation micro-grid system. A fixed voltage is calculated by using a stator flux observer at a controller of a rotor-side converter, so that the control mode of the controller of the rotor-side converter is double-closed-loop control consisting of outer loop voltage control and inner loop current control. Through voltage control and harmonic compensation links of a controller of a direct current bus side converter, no matter how parameters of a generator change under the full resonant frequency, a transfer function is zero, and the influence of port voltage disturbance can be completely inhibited. According to the invention, the system is controlled in a flux linkage orientation vector control mode, the stator side converter is used for compensating system harmonic waves, and when the system harmonic waves of the open-winding double-fed motor micro-grid system are large due to factors such as non-linear load operation, the harmonic waves can be effectively removed.

Description

technical field [0001] The invention belongs to the field of micro-grid control, in particular to a harmonic elimination device for an island-mode open-winding double-fed wind power generation micro-grid system. Background technique [0002] Double-fed wind generators are widely used in large and medium-sized wind turbines. The structure and composition of double-fed wind generators are the same as those of wound induction motors. According to the needs of generators, the electromagnetic design requirements are different. Doubly-fed wind turbines generally use 4 poles or 6 poles, generators below 2MW usually use 4 poles, and generators above 2MW mostly use 6 poles. The doubly-fed wind turbine stator is directly connected to the grid, and the wound rotor is connected to the grid through a frequency converter. When the load and speed of the double-fed generator change, the frequency and phase of the current fed into the rotor winding can be adjusted by the frequency converter...

AI Technical Summary

Problems solved by technology

However, when the open-winding doubly-fed wind power generator microgrid system has large system harmonics due to nonlinear load operation and other factors, the harmonics of the port voltage are relatively large, and the traditional open-winding doubly-fed wind power generation microgrid system cannot solve the current problem. Today's problem, resulting in unstable output voltage and poor transmission quality

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