特种作业装置增强型数字锁相环设计

针对特种作业人员在电力设备(线路)相序核对方面的实操培训和取证考核时缺乏可操作设备的问题,设计了一种新型的特种作业电工核相实训装置。该装置将220 V交流电通过整流电路后转变为直流电,然后利用SVPWM技术,由FPGA控制高功率快速IGBT的通断,将直流电变为三相交流电,并通过提出的增强型数字锁相环技术保证三相交流电的相位和频率精度,最后通过滤波电路和升压变压器产生380 V/10 kV的三相交流电。采用双模技术设计的锁相环即使在电网电压严重畸变的情况下也能表现出优异的性能。增强型锁相环技术通过实验得到了验证,能够提高电工核相实训装置的输出稳定性和精度。

In view of the lack of operable equipment in the practical training and certification examination of phase sequence verification of power equipment(line) for special operators, a new type of nuclear phase training device for electricians in special operations is designed. The device converts 220V alternating current into direct current after passing through the rectifier circuit, and then uses SVPWM technology to control the turn-on and off of high-power and fast IGBT by FPGA, and turns direct current into three-phase alternating current, and ensures the phase and frequency accuracy of three-phase alternating current through the proposed enhanced digital phase-locked loop technology. Finally, the three-phase alternating current of 380V/10kV is generated by filter circuit and step-up transformer. The phase-locked loop designed with dual-mode technology can show excellent performance even in the case of serious grid voltage distortion. The enhanced phase-locked loop technology has been verified by experiments, which can improve the output stability and accuracy of the electrical nuclear phase training device.