CAJ | 학술논문

提出了2种基于模块化结构的铁道统一电能质量控制器主电路拓扑,2种拓扑交流侧均采用链式结构,具有良好的谐波特性。针对链式结构变流器存在的直流电压平衡问题,建立了所述拓扑中电容电压的数学模型,并对现有各种直流电压平衡控制策略的优缺点及存在有功功率双向流动的背靠背变流器的适用性进行了分析。结果表明,电容电压中的直流分量分别与吸收和发出有功功率侧变流器的调制比成正相关和反相关的关系。最后,给出了铁道统一电能质量控制器装置级控制策略,并通过仿真实例证明了所述拓扑和控制策略的正确性。
제출료2충기우모괴화결구적철도통일전능질량공제기주전로탁복,2충탁복교류측균채용련식결구,구유량호적해파특성。침대련식결구변류기존재적직류전압평형문제,건립료소술탁복중전용전압적수학모형,병대현유각충직류전압평형공제책략적우결점급존재유공공솔쌍향류동적배고배변류기적괄용성진행료분석。결과표명,전용전압중적직류분량분별여흡수화발출유공공솔측변류기적조제비성정상관화반상관적관계。최후,급출료철도통일전능질량공제기장치급공제책략,병통과방진실예증명료소술탁복화공제책략적정학성。
Two main circuit topologies suitable for the railway power quality controller （RUPQC） based on the modular structure are proposed. They both have a cascaded structure on the alternating current （AC） side with low level harmonics. To solve the capacitor voltage balance problem in the cascaded converter, a mathematic model of direct current （DC） capacitor voltage in the proposed topologies are deduced. The advantages, disadvantages and application of existing balancing methods for back-to：back ＇converters are analyzed, which have bidirectional real power flow. The results show that the DC component of capacitor voltage has positive correlation and negative correlation with modulation rations of absorbed and emitted active power respectively. In the end, the control scheme of RUPQC devices is given, the effectiveness of the topologies and control algorithm proposed is verified by simulation examples.