针对矿井低压电网功率因数低以及存在谐波电流等问题,提出一种PWM波形的调制方法,应用到矿用低压静止无功发生器(SVG,Static Var Generators)中,通过该方法产生的电流谐波成份少,可以调节功率因数为所需的功率因数,算法简单且易实现。...针对矿井低压电网功率因数低以及存在谐波电流等问题,提出一种PWM波形的调制方法,应用到矿用低压静止无功发生器(SVG,Static Var Generators)中,通过该方法产生的电流谐波成份少,可以调节功率因数为所需的功率因数,算法简单且易实现。本文中的算法是根据需要的功率因数及电流计算出可控器件的开通、关断时间,进而控制可控器件产生需要的电流。为检测产生电流的谐波成分,加入p-g法检测电流谐波。通过Matlab对三相电路仿真,验证算法的有效性。仿真结果表明,该方法产生的电流谐波成份少,功率因数可以调节,对PWM控制策略的实现具有一定的指导意义。展开更多
The ambiguity function of Chinese standard Digital Television Terrestrial Broadcasting (DTTB) signals for passive radar contains one main peak and many side peaks. The side peaks may cause the false alarms. The relati...The ambiguity function of Chinese standard Digital Television Terrestrial Broadcasting (DTTB) signals for passive radar contains one main peak and many side peaks. The side peaks may cause the false alarms. The relative positions and the reasons for the side peaks are analyzed and a new algorithm for side peaks suppression is proposed in this paper. The algorithm, in consideration of the characteristics of the structure of the frame, can eliminate the side peaks completely in the valid Doppler observation interval by setting the reference signals to zero at equal intervals. Both the simulative and experimental results show that this algorithm can improve the performance of target detection of the passive radar based on DTTB signal.展开更多
文摘针对矿井低压电网功率因数低以及存在谐波电流等问题,提出一种PWM波形的调制方法,应用到矿用低压静止无功发生器(SVG,Static Var Generators)中,通过该方法产生的电流谐波成份少,可以调节功率因数为所需的功率因数,算法简单且易实现。本文中的算法是根据需要的功率因数及电流计算出可控器件的开通、关断时间,进而控制可控器件产生需要的电流。为检测产生电流的谐波成分,加入p-g法检测电流谐波。通过Matlab对三相电路仿真,验证算法的有效性。仿真结果表明,该方法产生的电流谐波成份少,功率因数可以调节,对PWM控制策略的实现具有一定的指导意义。
文摘The ambiguity function of Chinese standard Digital Television Terrestrial Broadcasting (DTTB) signals for passive radar contains one main peak and many side peaks. The side peaks may cause the false alarms. The relative positions and the reasons for the side peaks are analyzed and a new algorithm for side peaks suppression is proposed in this paper. The algorithm, in consideration of the characteristics of the structure of the frame, can eliminate the side peaks completely in the valid Doppler observation interval by setting the reference signals to zero at equal intervals. Both the simulative and experimental results show that this algorithm can improve the performance of target detection of the passive radar based on DTTB signal.