一种新的基于相位调制跟踪的电源并联控制方法

研究了抗干扰能力强、控制可靠性高的数字化并联控制技术，提出了一种数字均流控制方法一相位调制跟踪法。该方法将每个模块有功功率、无功功率和同步信号通过相位调制的方法变换为相位变化的周期脉冲信号，然后通过锁相同步的方法使所有并联逆变器模块都跟踪相位最超前，即输出功率最大模块的脉冲信号，从而实现功率均分。该方法具有控制信号分辨率高，抗干扰能力强以及稳定性好等优点，提高了系统均流控制精度；同时，自然实现了民主主从控制，具有好的控制冗余性。克服了线路阻抗变化对系统均流精度的影响。实验结果表明，该方法能较好地实现逆变模块的功率均分，模块间输出电流偏差小于1％。

A NOVEL POWER PARALLEL OPERATION CONTROL METHED BASED ON MODULATED PHASE TRACKING

A novel parallel operation control scheme- Modulated Phase Tracking Method (MPTM) is put forward. In MPTM each paralleled inverter modulates its power value into the phase of a periodic pulse signal and transmits it to the communication line. By phase-locked technique, all the inverters track the pulse-leading inverter which has the maximal output power value. When the output pulses of inverters are synchronized, the output power values are all the same. This method has high precision,good stability and insensitive to line impedance variation. It realized the democratic master-slave logic with high control redundancy. The experimental results show the proposed method can share the output power quickly, and the current-sharing error is less than 1%.