CAJ | 학술논문

研究逆变器无互联线冗余并联系统，针对传统无互联线下垂控制的不足，借鉴电力系统中应用于功率调度的分层控制方法，提出多层控制方法。第1层为改进的PQ下垂算法，对系统的频率及初始相位同时进行调节，以兼顾提高系统的动态和稳态性能；第2层控制检测系统交流母线电压的频率及幅值，以补偿下垂控制损害的负载调整率；第3层控制检测交流母线电压相位，实施直接同步调节，减小投入并联瞬间的冲击并避免动态相位失步。详细分析控制原理及各层控制之间的关系协调，并给出采用常规数字信号处理器的实现方法。由2台三相逆变器组成的并联系统的实验结果表明，多层控制无线并联方法实现了逆变器并联系统运行的稳定性和可靠性，具有好的动态和稳态性能。
연구역변기무호련선용여병련계통，침대전통무호련선하수공제적불족，차감전력계통중응용우공솔조도적분층공제방법，제출다층공제방법。제1층위개진적PQ하수산법，대계통적빈솔급초시상위동시진행조절，이겸고제고계통적동태화은태성능；제2층공제검측계통교류모선전압적빈솔급폭치，이보상하수공제손해적부재조정솔；제3층공제검측교류모선전압상위，실시직접동보조절，감소투입병련순간적충격병피면동태상위실보。상세분석공제원리급각층공제지간적관계협조，병급출채용상규수자신호처리기적실현방법。유2태삼상역변기조성적병련계통적실험결과표명，다층공제무선병련방법실현료역변기병련계통운행적은정성화가고성，구유호적동태화은태성능。
In order to cope with the drawbacks of conventional droop method, a hierarchical control for inverters in parallel operation without interconnection is proposed refering to the hierarchical control applied to power dispatching in AC power systems. The hierarchical control consist of three levels. The primary control is based on an improved droop method, the sharing of the active and reactive power in each module is controlled and balanced by adjusting the phase and amplitude of the output voltage respectively. The secondary control is to compensate the droop of the output voltage from its reference, induced by the droop control, to improve the load regulation performance of the inverter. The last but not the least control limits the phase deviation between the inverter and the shared AC bus in order to ensure all the parallel inverters keeping in phase with each other. The operational principle and implementation was analyzed in detail. A prototype, configured by two paralleled inverters, was set up, on which many dynamic and steady experiments were carried out. Experiment results verify the validility of the proposed control.