Abstract The switch on of AC-DC Buck converter brings harmonic waves to the grid, and causes the decline of power factor, affects the grid power quality. This paper comparing with the current harmonic suppression methods, considering to employs PID control, as the manual regulation of parameters, it is hard to achieve good controlling effect.It proposes an inverter harmonic suppression method based on genetic algorithm... The switch on of AC-DC Buck converter brings harmonic waves to the grid, and causes the decline of power factor, affects the grid power quality. This paper comparing with the current harmonic suppression methods, considering to employs PID control, as the manual regulation of parameters, it is hard to achieve good controlling effect.It proposes an inverter harmonic suppression method based on genetic algorithm PID control. It gives the AC-DC Buck converter circuit structure and controlling model, analyzes the operating principle and conducts simulation verification. The simulated results show that this method can suppress harmonic effectively and improve the power factor, which has certain utility value in practical application. Read More Read Less

Abstract This paper use the methods of S transformation to test the starting time, the end of the time, frequency and amplitude characteristics of common transient power quality signal disturbance. Through error analysis and simulation show that this method can accurately determine the disturbance occurred time and duration, and the identification and determination of disturbance can be simple and intuitive. It has the practical... This paper use the methods of S transformation to test the starting time, the end of the time, frequency and amplitude characteristics of common transient power quality signal disturbance. Through error analysis and simulation show that this method can accurately determine the disturbance occurred time and duration, and the identification and determination of disturbance can be simple and intuitive. It has the practical value and realistic significance to power quality signal interference analysis. Read More Read Less

Abstract The ubiquity of mobile devices is the result of increasing popularity of mobile applications that are becoming more diverse and intuitive. The mobile device market is composed of several mobile platforms such as Android and iOS, so it is important to be able to deliver applications available for more than one platform in less time. But it is becoming increasingly difficult with the... The ubiquity of mobile devices is the result of increasing popularity of mobile applications that are becoming more diverse and intuitive. The mobile device market is composed of several mobile platforms such as Android and iOS, so it is important to be able to deliver applications available for more than one platform in less time. But it is becoming increasingly difficult with the incompatibility between platforms and their SDK. To solve that, cross platform mobile development solutions have been investigated. Although each of such tools allows developing cross-platform mobile applications, the result can sometimes be unsatisfactory in comparison to a native application. In this paper, we present existing cross platform approaches. We discuss the general architecture of cross platform mobile applications. Then, we propose the desirable requirements in cross platform frameworks. Some existing solutions will be evaluated based on these requirements. We conclude the paper by some future perspectives. Read More Read Less