Abstract
Due to the power-grid low-order harmonic voltage and the nonlinearity of power electronic devices, the grid-connected converter of wind power generation system produces grid-connected harmonic current. In order to improve the output power quality of full-power grid-connected converter of wind power generation system, based on the detailed analysis of the harmonic mathematical model of grid-side converter, a cross-coupling control strategy for suppressing the low-order harmonic current components is proposed in this paper. In this control strategy, the DC component of each grid-connected harmonic current is detected in the multi-synchronous rotating coordinate system, and the current cross-coupling control method is adopted to realize the accurate control of each harmonic current. The harmonic current cross-coupling controller is analyzed and designed in detail. The proposed control strategy takes into account the cross-coupling effect of each harmonic current, which can effectively reduce the interaction between each harmonic current and the fundamental current, and improve the stability of the system. Simulation and experimental test verify the correctness and feasibility of the proposed control strategy.
Highlights
A kind of green energy, wind energy has been developed rapidly in the field of renewable energy sources in recent years [1]
The proposed control strategy takes into account the crosscoupling effect of each harmonic current, which can realize the accurate control of grid-connected harmonic current
The proposed control strategy can suppress the grid-connected harmonic current caused by the power-grid low-order harmonic voltage and the nonlinear characteristics of the gridconnected converter at the same time
Summary
A kind of green energy, wind energy has been developed rapidly in the field of renewable energy sources in recent years [1]. The inductance of the grid-side inlet reactor is generally small, and its working switching frequency is low, which will lead to a large degree of loworder harmonic current in the grid-connected converter. This will worsen the output power quality of the wind power generation system. In reference [18], a grid-side converter control strategy using quasi-proportional resonance(quasiPR) controller is proposed, which can suppress the negative sequence component and low harmonic current component of grid-connected current in permanent magnet direct drive wind power system. The proposed control strategy is of great significance to further improve the output power quality of the grid-connected full-power converter of wind power generation system
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