摘要
分析了单相4象限变流器的主电路及其预测电流控制原理。为了减小控制延时对电流环稳定性的影响,根据电感电流方程,构造了超前一个控制周期的电流估计器。该算法能够消除滞后一拍控制对电流稳定性带来的影响,降低电网电流谐波含量,具有预测精度高、易于DSP实现的特点。实验结果验证了该方法的正确性和有效性,有效改善了交流电流波形。
The principle of single-phase four-quadrant converter and its predictive current control strategy were studied. But the inherent disadvantage of digital control time delay could lead the system oscillation. Therefore, current estimation method was used to overcome it. Using the inductor current equation, the current is predicted ahead of a control cycle. The algorithm can eliminate the impact of the lag-behind control upon the current stability and reduce the harmonic content of the grid current. The experiment results based on DSP verifiy the proposed method is effective and the AC effective current performance is obviously improved.
出处
《电气传动》
北大核心
2009年第12期34-36,共3页
Electric Drive
基金
国家电网公司科技项目(SGKJ[2007]102)
关键词
4象限变流器
预测电流控制
电流估计
DSP
four-quadrant converter
predictive current control
current estimation
DSP
