基于综合无功目标的整流器直接电流控制

直流母线电压稳定是交-直-交型变频器系统正常工整流器控制策略.在d-q同步旋转坐标系下分析了整流器系统动态特性.指出在传统的直接电流控制方案基础上,利用无功电流iq对有功电流id响应速度的影响可增强母线电压抗扰能力.进而提出一种将维持单位功率因数和母线电压稳定模糊综合为iq调节目标的控制方案.仿真结果表明新策略改善了整流器系统的动态特性,因此能够减少对直流母线电解电容的容量要求,从而提高了整体系统的可靠性.

Direct Current Control for Rectifiers With Comprehensive Target of Reactive Power

As DC-bus voltage is significant for AC-DC-AC converter system operation,net-side rectifier control strategy is researched and improved. Dynamic characteristics of rectifier is analyzed under d-q synchronous reference frame,and the suggestion for traditional direct current control strategy to improve anti-disturbance performance of DC-bus is presented,which is taking advantage of that reactive power current iq can increase the response speed of active power current id. As the result,a control strategy with a comprehensive iq adjusting target of both power factor keeping and DC-bus voltage maintaining using fuzzy logic,is proposed. Simulation results indicate that the novel strategy improves the DC-bus dynamic ability,therefore the electrolytic capacitor capacity can be decreased,which will enhance the total system reliability.