可调节有功无功的双Buck逆变器控制算法

目前,轻型直流输电网络中的电压源变流器使用了较多的高频开关器件,导致成本高,损耗大,限制了其实际应用。一种新型的Buck型电压源逆变器(BVSI)由一组双Buck变流器和一个工频逆变桥组成,只需采用两个高频开关,因而可降低系统成本,具有很大的技术和经济优势。文中提出了基于单周控制理论就可实现双Buck逆变器有功功率和无功功率单独调节的算法。推导出了基于单周控制思想的控制方程。运用简单的控制电路就可实现交流侧有功功率与无功功率的控制。另外对该算法进行了详细的仿真研究,仿真结果证实了该算法的正确性。

Control Algorithm to Regulate the Active and Reactive Power of Double Buck Inverter

The voltage source converter in light HVDC system comprises so many switches operated in high frequency,which causes large switching losses,high cost and limits its application.A new Buck voltage source in-verter(BVSI) comprises a dual-buck converter and a three-phase inverter operating in grid frequency.Only two high frequency switches are used and the cost can be reduced,which has the advantages in technology and econ-omy.A control algorithm which can regulate both the active and reactive power of BVSI based on one cycle control is proposed in this paper.The control algorithm only employs very simple analog circuit to achieve controllable ac-tive power and reactive power.Simulation results show the validity of the proposed control algorithm.