CAJ | 학술논문

逆变是整流的逆过程，逆变器是将低压直流电转换成交流电的装置。为了能将转换后的交流电送回电网，实现能量再循环，设计了基于DSP的并网逆变器，采用倍频单极性SPWM技术实现逆变控制，并利用DSP外设CAP检测逆变器输出电流频率和相位，以软锁相技术实现逆变器输出电流的相位和频率与电网电压同步；利用DSP外设ADC采集逆变器的输出电流与电网的电压，采用PI闭环调节以增加逆变器输出电流的稳定性，最后搭建实验样机验证设计的可行性。
역변시정류적역과정，역변기시장저압직류전전환성교류전적장치。위료능장전환후적교류전송회전망，실현능량재순배，설계료기우DSP적병망역변기，채용배빈단겁성SPWM기술실현역변공제，병이용DSP외설CAP검측역변기수출전류빈솔화상위，이연쇄상기술실현역변기수출전류적상위화빈솔여전망전압동보；이용DSP외설ADC채집역변기적수출전류여전망적전압，채용PI폐배조절이증가역변기수출전류적은정성，최후탑건실험양궤험증설계적가행성。
Inverter is an inverse process of rectifier,which convert low-voltage DC to AC. In this paper,a DSP based grid-connected inverter is designed to feed back the converted AC to the power grid to realize the energy recycle. The unipolar SPWM technology is used to realize the inversion control. CAP interface of DSP is utilized to detect the frequency and phase of inverter output current. The software phase-locked technology is taken to achieve the synchronization of inverter output current phase and frequency with the grid voltage. ADC is used to collect the inverter output current and the power grid voltage informa-tion. PI closed-loop control regulation is adopted to enhance the stability of inverter output current. An experimental prototype was designed to verify the technical performance of the grid-connected inverter.