CAJ | 학술논문

针对不同容量逆变电源的并联，提出了一种双外环分布式并联控制方案，使得系统由负载电流的大小决定所需并联模块数以及并入系统的各并联逆变模块按自身容量比例分担负载电流，并能有效抑制系统环流，实现系统的冗余并联。该控制方法包括三个控制环：电流内环改善系统动态响应，电压外环确保系统的稳定性，电流外环跟随功率分配单元输出的电流信号来确定该模块所分担的负载电流的大小。其中功率分配单元根据负载电流和逆变电源额定电流的大小确定并联模块数，并提供各逆变模块的投切信号和电流外环给定信号以实现系统的负载电流分配和冗余控制。理论分析和仿真实验验证了该方案的可行性。
침대불동용량역변전원적병련，제출료일충쌍외배분포식병련공제방안，사득계통유부재전류적대소결정소수병련모괴수이급병입계통적각병련역변모괴안자신용량비례분담부재전류，병능유효억제계통배류，실현계통적용여병련。해공제방법포괄삼개공제배：전류내배개선계통동태향응，전압외배학보계통적은정성，전류외배근수공솔분배단원수출적전류신호래학정해모괴소분담적부재전류적대소。기중공솔분배단원근거부재전류화역변전원액정전류적대소학정병련모괴수，병제공각역변모괴적투절신호화전류외배급정신호이실현계통적부재전류분배화용여공제。이론분석화방진실험험증료해방안적가행성。
With regard to the different capacity power source inverters in parallel, a dual-outer-loop distributed control strategy is proposed. It can achieve the goal that the required modules in parallel system depend on the value of load current and all the parallel modules share load current in proportion to their own capacities, in addition, restrain circulating current and realize the redundancy in parallel. In this strategy, each inverter has three loops: an inner-loop current controller is used to improve the system dynamic response, an outer-loop voltage controller is to govern system stability, and an outer-loop current controller can achieve a weighted output current by following the output signal of power distribution unit. In order to realize load current accurately distribution and redundancy control of system, power distribution unit provides the given current signal of current outer-loop and switch signal of all modules according to the value of load current and voltage source rated current. Theoretical analysis and simulation verify the effectiveness of the strategy.