CAJ | 학술논문

为解决交流电网不平衡和畸变导致电压源换流器高压直流输电(voltage source converter based high voltage DC transmission，VSC- HVDC)的交直流侧电能质量恶化问题，提出单正序同步旋转坐标系下的d、q轴电流分量的比例积分-谐振控制-重复控制的混合控制策略。通过使有功功率的瞬时波动为零获得了网侧电流正负序分量参考值的表达式，进而利用比例积分控制器控制正序电流分量、谐振控制器控制负序电流分量，而利用重复控制用于抑制交流电网谐波的影响。进一步分析了采样频率与被控信号频率的比值为非整数时对重复控制的影响，进而提出基于线性插值的实际采样点对应的反馈信号的估计方法，以改善重复控制的性能。详细的仿真结果证明了所提出的混合控制策略的正确性和有效性。
위해결교류전망불평형화기변도치전압원환류기고압직류수전(voltage source converter based high voltage DC transmission，VSC- HVDC)적교직류측전능질량악화문제，제출단정서동보선전좌표계하적d、q축전류분량적비례적분-해진공제-중복공제적혼합공제책략。통과사유공공솔적순시파동위령획득료망측전류정부서분량삼고치적표체식，진이이용비례적분공제기공제정서전류분량、해진공제기공제부서전류분량，이이용중복공제용우억제교류전망해파적영향。진일보분석료채양빈솔여피공신호빈솔적비치위비정수시대중복공제적영향，진이제출기우선성삽치적실제채양점대응적반궤신호적고계방법，이개선중복공제적성능。상세적방진결과증명료소제출적혼합공제책략적정학성화유효성。
In order to solve the power quality deterioration of voltage source converter based high voltage DC transmission (VSC- HVDC) caused by the unbalance and distortion of AC grid, in this paper, a hybrid current control strategy combing PI, resonant and repetitive control for the d and q -axis current components is proposed. The reference positive and negative sequence currents are calculated by setting instantaneous ripples of active and reactive powers equal to zero, and then, the positive sequence current components are controlled by proportional integral (PI) controller, the negative sequence currents controlled by resonant controller and harmonics are eliminated by repetitive controller. Furthermore, the effect of non-integral ratio of sampling frequency and the frequency of controlled signal on the repetitive controller, and the improved method of estimating the actual sampling data based on linear interpolation algorithm is proposed to enhance the performance of repetitive controller. Detailed simulation results verify the accuracy and feasibility of the proposed strategy.