基于下垂特性的开关信号及接收相位双同步组网控制

Integration Control Based on Droop Characteristics Achieving Double Synchronization with the Switching Signal and the Reception Phase

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。

To solve the difficulties in the 400 Hz solid-state power supply integration system, the traditional droop control was improved. In consideration of connection impedance effects, nonlinear load effects and integration unit phase syn- chronization, a novel strategy of integration control was proposed based on droop characteristics to achieve double synchronization with the switching signal and the reception phase. In this control, the output impedance was designed by a virtual impendence with the high pass filter, which could eliminate the current sharing effects of connection impedance and nonlinear load. Besides, the integration units shared the sync phase by CAN bus and synchronize switching signal by inherent time delay compensation. The compensation for the reception phase could eliminate the time delay effect and the zero crossing voltage distortion. The total harmonic distortion of output voltage was 2.28% and the magnitude of circula- tion was less than 5 A, which proved that the integration control had a good circulation inhibitory effect.