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针对静止式中频电源组网系统的难点,在理论分析中频组网系统下垂控制的基础上,对传统无互联线下垂控制加以改进。在考虑组网连线阻抗影响、非线性负载影响及组网单元相位同步的基础上,提出了基于下垂特性的开关信号及接收相位双同步组网控制策略,该方法通过引入带高通滤波器的虚拟阻抗对输出阻抗进行设计,消除了连线阻抗及非线性负载对均流效果的影响;同时,组网单元通过CAN总线共享同步相位,采用固有延时补偿实现开关信号的同步,并对接收相位进行实时及过零点补偿,消除延时影响和过零点电压畸变,实验结果中输出电压总谐波含量为2.28%,环流峰值小于5 A,证明了该控制算法良好的环流抑制效果。
In view of the difficulty of static IF power supply network system, based on the theoretical analysis of the droop control of IF network system, the traditional no-wire droop control is improved. Based on the consideration of the influence of network connection impedance, the influence of nonlinear load and the phase synchronization of network elements, a control strategy based on droop characteristics of switching signals and receiving phase double synchronous networking is proposed. By introducing high-pass filter The virtual impedance design of the output impedance eliminates the influence of the connection impedance and the nonlinear load on the current sharing effect. Meanwhile, the networking unit shares the synchronization phase through the CAN bus, uses the inherent delay compensation to realize the switching signal synchronization, The phase is compensated in real time and zero crossing to eliminate the effect of delay and the voltage distortion of zero cross point. The total harmonic content of output voltage is 2.28% and the peak value of circulating current is less than 5 A in experiment. It proves that this control algorithm has a good effect of suppressing circulating current.