CAJ | 학술논문

为了减少风机驱动系统对电网造成的谐波污染，设计了一种带有功率因数校正功能的风机驱动器。在此项技术中，电流过零点畸变会影响功率因数校正的性能，为此提出了一种新的过零点畸变抑制方法并给出了理论证明和具体实现方式。采用占空比前馈补偿的数字控制，可以减小输入和输出电压对电感电流控制的干扰，从而使得输入电流能理想地跟踪输入电压。为了验证前馈补偿的效果，对输入阻抗进行分析进而说明了前馈补偿对电流相位超前的抑制作用。为得到准确的反馈电流，提出了一种电流采样方法，根据开关的占空比信息在一个P WM周期的两个不同时刻采样两次。文中所提出的方法可以有效抑制电流相位超前，减小电流过零点畸变，优化电流采样算法。仿真和实验结果都证明了所提出方法的正确性和有效性。
위료감소풍궤구동계통대전망조성적해파오염，설계료일충대유공솔인수교정공능적풍궤구동기。재차항기술중，전류과영점기변회영향공솔인수교정적성능，위차제출료일충신적과영점기변억제방법병급출료이론증명화구체실현방식。채용점공비전궤보상적수자공제，가이감소수입화수출전압대전감전류공제적간우，종이사득수입전류능이상지근종수입전압。위료험증전궤보상적효과，대수입조항진행분석진이설명료전궤보상대전류상위초전적억제작용。위득도준학적반궤전류，제출료일충전류채양방법，근거개관적점공비신식재일개P WM주기적량개불동시각채양량차。문중소제출적방법가이유효억제전류상위초전，감소전류과영점기변，우화전류채양산법。방진화실험결과도증명료소제출방법적정학성화유효성。
Single switch boost-type power factor correction (PFC) is applied to reducing power grid harmonic pollution in the fan motors control system.However,the current zero-crossing distortion will affect the PFC performance.To solve this problem,a new current zero-crossing distortion suppressing method and its concrete implementation are proposed.Digital control is adopted and duty ratio feedforward compensation is introduced to reduce the disturbance of input voltage and output voltage on the inductor current,forcing the input current to follow the input voltage changes;the input impedance is analyzed to show that duty ratio feedforward compensation can inhibit the current phase advance.A current sampling method is proposed to get the average current by sampling twice per PWM period.Simulation and experiment results show that the proposed method can inhibit current phase advance,eliminate input current harmonics,and achieve unity power factor correction,verifying the validity of the proposed method.