Voltage of short duration falls with short when cut off the power

The nicety of nowadays makes equipment, computer, the load using phone such as transducer falls to voltage of short duration all very sensitive, continuously of 16ms 85% fall to may bring about equipment to stop namely to 90% voltage of short duration machine. Voltage of short duration falls with short when cut off the power (the difference of Interruption) depends on short when the load when cutting off the power is average disconnect completely with power supply system, and voltage of short duration falls the load when happening still joins with power source, to certain industry user character, both all can cause equipment to stop machine, the result that produces is identical, but voltage of short duration falls the machine rate outclass that happen cuts off the power the machine rate that can produce. Investigation shows: In accident of all distribution system, voltage of short duration falls occupied 70 ％ - 80 ％ ; And in accident of transmit electricity system, voltage of short duration falls the proportion that holds exceeded 96 ％ . The attention degree that the attention degree that falls to voltage of short duration in Euramerican each country at present concerns issue of electric energy quality than other should be gotten greatly much, among them a main factor is to be in a lot of reason of electric energy quality, fall by voltage of short duration the user that cause complains the 80 ％ above that takes issue of quality of whole electric energy, and wait for the problem of electric energy quality that pose not to complain 20 ％ by overvoltage of operation of harmonic, flicker, switch. Be in China, as the development of socioeconomy, voltage of short duration falls and short when the attention that the problem that cut off the power also caused power supply company, user and mill business gradually. The government sector with be mixed important in unit of a few high-tech garden areas, large hospital, war industry especially. Accordingly, disturb to quality of the electric energy when demote of voltage of short duration is short undertake be administeringed effectively not only necessary and very pressing.
Voltage of short duration falls the problem is objective existence inevitable, the loss that the user causes to because voltage of short duration falls,decrease, must use device of specific custom-built electric power. Dynamic voltage regulator (DVR) it is compensator of series connection of a kind of static state. When deviate of systematic side voltage certain limits, DVR will be rapid movement, in order to compensate the deviation of power source voltage, the voltage that dog quickly and restores bear side is undee, satisfy the special user high demand to electric energy quality.
Abroad from 80 time end, a lot of companies began the special subject research of technology of custom-built electric power, rolled out the product such as SSTS, DVR, DSTATCOM to convert plant in succession.
DVR is improvement of problem of quality of voltage electric energy most the economy, most significant step. Nevertheless, at present DVR main circuit develop attacks to use two n, 3 n and the infuse pattern that use series connection transformer basically, put in a few problems or inadequacy on application, develop of cascade much n attacks can solve these problems effectively. About cascade the much n, DVR project that without infuse transformer develop attacks considers to reach a design to have not see a story, fall in the light of of short duration of voltage of middling pressure system processing target, much to cascade n undertakes without the DVR of infuse transformer structure develop attacks inclusive main circuit, store can, filter, of short duration falls detect the systematic design that reachs compensation to wait reachs emulation research to be opposite the application of respect of high capacity of DVR high pressure has important sense.
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