无互联线逆变器并联控制技术

传统的有互联线逆变器并联方式容易引入干扰.为此,研究了一种有利于采用全数字化有功功率、无功功率检测的逆变器无互联线下垂控制并联运行方案.在双闭环控制逆变器并联的系统模型下对功率理论进行分析,引入了基于频率和电压的下垂控制方程并推导下垂控制参数,介绍了一种有功功率、无功功率检测(PQ)调节方式并得出相应计算公式.仿真结果表明,该控制方案可以使逆变器间在无互联线的情况下获得良好的动态和静态特性,使负载的有功功率及无功功率得到了均分.

The control technology of parallel inverters without control interconnection

The traditional parallel converters with control interconnection are easily interfered with each other. This paper presents a control scheme for parallel operation without control interconnection based on droop control which is helpful to apply fully digital active and reactive power detection. After analysis of the basic power theory on the parallel inverters of double closed-loop feedback control model, the droop control equation based on frequency and voltage was obtained, and the droop control parameter was derived as well. Besides, this paper also introduces a way for active and reactive power detection and gives the relevant formula. The simulation results show that this control method indicates favorable fast transient and steady response of inverters, so active and reactive powers of load are shared out equally.