基于下垂特性的逆变器并联技术研究

Study on parallel operation of inverters based on droop method

本文分析了基于下垂特性控制的基本原理,进而对逆变器及其并联系统进行了设计。针对用一阶惯性环节滤除功率纹波的不足,本文在功率计算中引入了二阶振荡环节,提高了系统的可控性及其动态性能。虚拟阻抗的引入,减少了逆变器输出阻抗对并联系统的影响。最后本文通过对两台基于DSP TMS320F2407A的1kVA单相PWM逆变器的并联实验,验证了此控制方案的正确性与可行性。

This paper analyses the basic principles of droop method for wireless parallel operation of inverters. By adopting some new technologies, the performance of parallel operation system is improved. And in this paper the single inverters based on multiple feedback loop control method and their parallel operation system are designed. To overcome the disadvantages of first order inertial element, which is adopted in traditional parallel operation system to filter the power triples, the second order oscillational element is adopted in this paper, which improves the controllability and performance of the system. And the virtual impedance of the inverters on the performance prototype is built, which is composed of two static and dynamic performances of the system Key words： wireless parallel operation; droop impedance, adopted in this paper, reduces the impact of the output of parallel operation system. At last, to validate this control method, a lkVA single-phase PWM inverters based on DSP TMS320F2407A. The are tested, and the results show the good performance of the system.