With the rapid development of science technology and national economy, diverse kinds of industry production demand higher power quality; moreover, with the widely application of modern power electronics technology, power quality is deteriorated increasingly; therefore, more and more close attention is paid to power quality by both electric department and consumers. Power as a kind of special m...

As the global economy develops at a high speed,the number of car in cities increases rapidly,traffic jam becomes more and more seriously,monitoring the state of road traffic in real time has been significant for us to collect traffic information, standardize the management of traffic ,city layout and so on。Here, combining the task “Redlight runner recorder based on video technology”coope...

As a result of the development of economy, the power quality to which is paid attention by more and more users and electric power department is not only the deviation of voltage and frequency from the rating value, but also include the phenomenon of oscillation and pulse.So, it is necessarily to detect and identify the power quality. Based on this, this paper studied the methods of the detecti...

Direct Digital frequency Synthesis (DDS) was advanced rapidly in early 1970s and has been developing owing to its entirely digital structure. The appearance of Field Programmable Gates Array has changed the design method of digital electronical system and provided a new design model. With the two technologies and the flexible control ability of MCU, Functional Waveform Generator, has been deve...

The neutral resonant grounding by arc-suppression coils is widely utilized in intermediate voltage distribution network in our country. In order to improve the compensatory precision, the grounding capacitance of the network should be exactly measured. However, the existing detection methods, which mainly adopt indirect approaches, have the characteristics of low detective precision, complex d...

The power measurement of high power microwave(HPM) is imprecise because of its features of short pulse duration(10’s nanosecond), high power level(the order of gigawatt) and so on. Presented in this paper is the investigation of some problems existing in the far-field method widely used in HPM measurement. First, the errors are analyzed from the practical calculation of the directivity for t...

As lots of power electronics devices have been applied in many fields, theproblem of harmonic pollution in the power system is more serious. Active powerfilter is the effective solution to this problem .The harmonic detection is the key factoraffecting the compensation performance of APF, but also the extension application. Asthe development of the harmonic research, the harmonic detection is ...

This paper studies the system of the Arbitrary Waveform Generator based DSP. DDSis key technique to it. DDS is digital synthesizer technique. This technique can controlamplitude, phase and frequency of waveform in precision, so it can synthesize arbitrarywaveform. The drawback of the DDS is high level of spurious frequencies. There arethree main source of spurious signal in DDS: the truncation...

With the rapid development of computer technology and it\’s compact combination with meter technology, the measuring technique gets great progress. The contemporary measuring technique enters intelligent stage. This can be reflected by: many measuring process has been realized intelligent control;the capability of data disposal of meters have been improved greatly. The data being dispose...

With the quick development of knowledge economic, education of quality, whose core is theculture of creative spirit and practice ability, has become one of the important tasks of high education innovation in 21 century. And the culture of creative spirit and practice ability need support of the laboratory education. So, building a opening laboratory has become a tendency of the innovation in l...