负载强扰下海浪发电逆变器控制方法的研究

Research on control method of load under the strong disturbance of wave power inverter

在采用永磁无刷电机运行的海浪发电系统当中,电网为孤网且负载多为民用电,因此由负载不平衡而造成的三相输出电压不对称是亟待解决的问题之一。以内模原理为基础提出了瞬时值反馈控制器和重复控制器相结合的控制方法,此方法改进了在海浪发电系统中传统的三相逆变器在负载强扰下产生的三相输出电压不对称的情况,达到调整畸波,输出电压平滑对称的目的。论文应用Matlab仿真验证该方案对不平衡负载有较强的抑制作用。

In the use of permanent magnet brushless motor running wave power system, the grid is the isolated net- work and the load power more for the people. So the asymmetrical three-phase output voltage caused by the unbal-anced load is one of the problems that must be solved. Based on the inner model control （IMC） , the new control method that combined the fundamental wave and harmonic disturbance instantaneous value feedback controller is put forward in this paper. This method analyzed and improved the three-phase inverter under the condition of unbalanced load produced by the asymmetric three-phase output voltage, which achieved the objective of the output waveform sym- metry. The application of Matlab simulation in this paper verifies the scheme has a strong inhibitory effect for the un- balanced load.