Study On The Test System And Charging Device Of Dynamic Voltage Restorer

With the rapid development of industrial technology,electric power network composition has gradually become more complex.Meanwhile,the new electrical equipments were applied in dustry.They are very strict to power quality and present new require to power supply.In the research data about power quality,it is shown that voltage sag is worst power quality problem,which can bring the most losses in various power quality problems.As a result,people pay more attention to voltage sag to the other power quality problem.Especially,in lately a few years,lots of electrical equipments based on microcomputer have been applied in commercial run and daily life.These electrical equipments are sensitivity to the voltage sag.The voltage sag can result in irregular work of these equipments and enormous economic loss.It is essential to research on voltage sag.At present,as a member of flexible AC transmission system(FACTS),dynamic voltage restorer(DVR)can solve the stability problem of power system effectively because of its dynamic performance and small capacitance.For a more effective compensation to the voltage sag,the first research is testing voltage sage.The detection method based on the instantaneous reactive power theory are different when testing the different voltage sag,because of the different causes bring the voltage sag.That can be more nicety and more effective.And the emulate result is also good.In testing the voltage sag, a lowpass filter should be used.Different infection from the filter depends on theSuperconducting magnetic energy storage(SMES) is a new energy storage method.It can respond more quickly and be more environmental compared with the other energy storage device.The SMES principles are used to develop models of both the SMES single-bridge system and the double-bridge system.Control strategies have been discussed both for active power control and a comprehensive control strategy for simultaneous modulation of active and reactive power.