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The high power self-commutated VSC are the key control devices in HVDC, FACTS and DFACTS systems. The self-commutated voltage source converter back to back (VSC BTB) link connects two ac power systems asynchronously, can control the active power exchanged between the two ac system and the reactive powers at the both terminals independently. To achieve the expected control objectives suitable control...
Digital controller for a power converter with non-linear variable switching frequency is presented in this paper. Regression analysis is used to obtain approximated function of the non-linear variable switching needed to yield output voltage ripple in DCM that is close to the CCM output voltage ripple. The need to sense and sample the peak inductor current and the input voltage is avoided in the presented...
This paper presents a controller with duty-cycle dynamic distribution within parallel-connected PFC converters based on average-current control strategy, which can distribute the control duty-cycle automatically for each parallel-connected PFC converter to realize current balance by the difference from its reference current, and it can decrease and even eliminate the disturbance resulted by current-balancing...
Analysis and control of a dynamic voltage restorer have been described. The voltage restorer is based on a 4-leg voltage source converter. The 3-phase input variables are resolved into the positive, negative and zero-sequence components using a weighted, recursive, least-squares estimator. Identical controllers have been used for each sequence component. A laboratory model of the restorer has been...
Conventional PWM voltage mode or current mode control techniques are commonly used in practice for controlling switched-capacitor converters. However, such control methods are only useful for applications involving small operating regions. This paper discusses the application of nonlinear control in the form of sliding mode control on switched-capacitor converters. The result is an enlarged operating...
In this paper, the closed-loop control of a 4-leg voltage source converter-based dynamic voltage restorer has been described. A low-voltage, laboratory model of the dynamic voltage restorer has been constructed. The controller functions have been implemented in a DSP-based digital controller. A program for resolving the 3-phase variables into the sequence components has also been included among the...
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