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A two-stage cascaded converter is formed by connecting two subconverters in series. Output impedance of one subconverter will, therefore, interact with input impedance of the other subconverter. Such interaction may affect the system dynamics and stability, especially when one subconverter is constant-power-controlled, and hence, has different impedance characteristics when its power reverses. To...
Constant power load converter will introduce unstable factor to the cascaded system. Exchanging the position of constant power load converter as the source converter can improve system stability. Active solutions to modify the negative impedance of constant power load converter can also make the system more stable. The concept of coordinative front-to-end impedance control is proposed in this paper,...
PI controllers are frequently implemented in cascaded converter system to control the DC-link voltage, because they can achieve zero steady state error. However the PI controller adds a pole at the origin point and a zero on the left half plane, and it increases the control system type number, and then the system is more difficult to control. This paper proposed a DC-link control method for the two...
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