一种400Hz逆变电源的无线并联综合控制方法

A Synthesis Wireless Control Strategy for Parallel Operation of 400Hz Inverters

针对传统无线下垂并联控制系统稳态均流精度和输出电压控制精度之间存在的固有矛盾,以及输出电压幅值控制中存在的无功功率偏差的问题,本研究采用了一种新型并联综合控制方法,其中对幅值控制采用新的自适应下垂控制算法,以进一步提高无功功率的均分程度,同时电压精度与传统下垂法使用最小的下垂系数的输出电压一致;本研究采用虚拟阻抗使逆变器具有固定的输出阻抗,克服了由于输出阻抗不一致引起的环流过大;本研究还采用积分器补偿器,缓慢调整所有并联逆变电源参考电压的幅值和频率,使系统进入稳态后既消除环流又保证输出电压的控制精度。通过仿真验证了该方案的良好性能。

With an aim at improving the inherent tradeoff existing between the power sharing accuracy and the output voltage regulation as well as the reactive power problem in controlling output voltage amplitude range,a novel type of parallel synthesis control strategy is adopted in this study,of which a new adaptive droop method is adopted to control amplitude range so as to further improve good reactive power sharing,and at the same time,the output voltage accuracy is in agreement with the output voltage by the conventional droop method with the minimum droop coefficients;the virtual impedance is adopted to make inverters have the fixed output impedance so as to overcome the large circulating-current caused by the un-uniform output impedance;the integral compensator is adopted slowly to regulate the amplitude and frequency of reference voltage of all parallel inverter power source so as to render the system to enter the steady state,whereby eliminating the circulating-current and guaranteeing the control accuracy of output voltage.Accordingly,the good performance of this control strategy has been tested via the simulation.