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针对链式静止同步补偿器中直流电容电压平衡的问题,在分层控制架构的基础上,提出基于有功电压矢量叠加的平衡控制方法。上层通过解耦控制完成三相链接总的有功和无功控制;下层采用所提出的平衡控制,在上层输出的控制量上叠加一个与输出电流方向平行的有功电压矢量对同相链节间的有功进行分配,实现直流电容电压平衡控制。对直流电容电压平衡控制进行矢量分析,得到其稳定工作区域以及所提控制方法的物理意义和调控范围。研制了一台三相36个链节的物理样机,并在样机上进行了实验验证,证明了所提控制方法的有效性和可行性。
Aiming at the problem of DC capacitor voltage balance in chain static synchronous compensators, a balanced control method based on active voltage vector superposition is proposed on the basis of hierarchical control architecture. The upper layer through the decoupling control to complete the three-phase link the total active and reactive control; the lower the use of the proposed balance control, superimposed on the control output of the upper output current direction parallel to the active voltage vector active phase between the same phase For distribution, to achieve DC capacitor voltage balance control. The DC capacitor voltage balance control vector analysis, to obtain the stable working area and the control method of the physical meaning and control range. A three-phase physical prototype of 36 links has been developed. Experimental verification has been carried out on a prototype to prove the effectiveness and feasibility of the proposed control method.