CAJ | 학술논문

电网低次谐波电压和电力电子器件的非线性将使得风电并网变流器产生较重的并网谐波电流，为改善风电并网用全功率变流器系统的输出电能质量，在详细分析网侧变换器的谐波数学模型的基础上，提出一种抑制并网低次（5、7、11、13次）谐波电流分量的交叉耦合控制策略。该控制策略通过在多同步旋转坐标系下检测各次并网谐波电流的直流分量，采用电流交叉耦合控制方式实现对各次谐波电流的准确控制，详细分析并设计谐波电流交叉耦合控制器。所提控制方案考虑了各次谐波电流回路的交叉耦合影响，可有效降低各次谐波电流以及基波电流之间的相互影响作用，有利于提高系统工作的稳定性。仿真和实验结果验证了所提控制方案的正确性和可行性。
전망저차해파전압화전력전자기건적비선성장사득풍전병망변류기산생교중적병망해파전류，위개선풍전병망용전공솔변류기계통적수출전능질량，재상세분석망측변환기적해파수학모형적기출상，제출일충억제병망저차（5、7、11、13차）해파전류분량적교차우합공제책략。해공제책략통과재다동보선전좌표계하검측각차병망해파전류적직류분량，채용전류교차우합공제방식실현대각차해파전류적준학공제，상세분석병설계해파전류교차우합공제기。소제공제방안고필료각차해파전류회로적교차우합영향，가유효강저각차해파전류이급기파전류지간적상호영향작용，유리우제고계통공작적은정성。방진화실험결과험증료소제공제방안적정학성화가행성。
The low order harmonic in grid voltage combined with the nonlinear characteristics of the power electronics devices will cause great amount of harmonic currents from the grid-connection converter used for wind power generation system, this will degrade the operational performance of the generation system. In order to improve the power quality of the full size power converter for the wind power generation system, a method was proposed to suppress the harmonic currents of the grid-side converter （GSC） in this paper. The harmonic mathematic model of the GSC wasinvestigated in detail, and the cross-coupling control strategy was proposed to suppress the low order （5th, 7th, llth, 13th） harmonic current components. In the proposed control scheme, the DC components of each order harmonic currents could be detected in the multiple synchronous rotating reference frames, and they could be accurately controlled to be zero with the cross-coupling current controller which was analyzed and designed. Taking into account the cross-coupling influence of the each order harmonic current circuit, the proposed control strategy can effectively reduce the interactive effects among the each order harmonic currents and fundamental current, which improving the operation stability of the system. Both the simulation and experiment results verify the proposed control scheme.