變頻器低電壓穿越電源的設(shè)計與實現(xiàn)
發(fā)布時間：2018-11-21 09:23
【摘要】：異步電機變頻器應(yīng)用在一些重要場合時,要求當(dāng)電網(wǎng)電壓跌落,在其啟動低電壓保護使電動機停機前,維持變頻器運行一定時間,給系統(tǒng)其他環(huán)節(jié)足夠的響應(yīng)處理時間。針對此要求,設(shè)計了用于變頻器的低電壓穿越電源,在功率回路、控制回路、輔助回路等環(huán)節(jié)進行了嚴(yán)格設(shè)計。該電源采用在電網(wǎng)電壓跌落時投入供電,電網(wǎng)正常時旁路的工作方式;在投入供電時,采用雙單環(huán)PI自動閉環(huán)控制,提高了設(shè)備的響應(yīng)速度和控制精度;為了提高設(shè)備自動運行的可靠性,軟件設(shè)計上加入了日自檢、年自檢和故障檢測功能。仿真和實驗表明,電網(wǎng)電壓跌落到變頻器可以耐受的額定電壓的80%時,低電壓穿越電源自動迅速投入進行升壓,直至電網(wǎng)電壓跌落到額定電壓的20%的情況下也能保持運行,輸出側(cè)電壓響應(yīng)速度和紋波值均在合理范圍之內(nèi)。
[Abstract]:When the asynchronous motor inverter is applied in some important occasions, it is required to maintain the frequency converter for a certain time before it starts the low voltage protection to make the motor stop, and to give the other links of the system sufficient response processing time. In order to meet this requirement, the low voltage traversing power supply is designed for inverter, and strict design is carried out in power loop, control loop, auxiliary circuit and so on. The power supply adopts the operation mode of power supply when the power grid voltage drops and the bypass circuit when the power network is normal, and the double single loop PI automatic closed-loop control is adopted when the power supply is put into operation, which improves the response speed and control precision of the equipment. In order to improve the reliability of the automatic operation of the equipment, the functions of daily self-checking, annual self-checking and fault detection are added to the software design. The simulation and experiments show that when the grid voltage drops to 80% of the rated voltage that the inverter can tolerate, the low voltage traversing power supply can automatically boost up the voltage quickly, until the grid voltage drops to 20% of the rated voltage, and it can also be kept in operation. The output voltage response speed and ripple value are within a reasonable range.
【作者單位】： 中國農(nóng)業(yè)大學(xué)信息與電氣工程學(xué)院;河北科技師范學(xué)院機電工程學(xué)院;
【分類號】：TM921.51
本文編號：2346549
[Abstract]:When the asynchronous motor inverter is applied in some important occasions, it is required to maintain the frequency converter for a certain time before it starts the low voltage protection to make the motor stop, and to give the other links of the system sufficient response processing time. In order to meet this requirement, the low voltage traversing power supply is designed for inverter, and strict design is carried out in power loop, control loop, auxiliary circuit and so on. The power supply adopts the operation mode of power supply when the power grid voltage drops and the bypass circuit when the power network is normal, and the double single loop PI automatic closed-loop control is adopted when the power supply is put into operation, which improves the response speed and control precision of the equipment. In order to improve the reliability of the automatic operation of the equipment, the functions of daily self-checking, annual self-checking and fault detection are added to the software design. The simulation and experiments show that when the grid voltage drops to 80% of the rated voltage that the inverter can tolerate, the low voltage traversing power supply can automatically boost up the voltage quickly, until the grid voltage drops to 20% of the rated voltage, and it can also be kept in operation. The output voltage response speed and ripple value are within a reasonable range.
【作者單位】： 中國農(nóng)業(yè)大學(xué)信息與電氣工程學(xué)院;河北科技師范學(xué)院機電工程學(xué)院;
【分類號】：TM921.51
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