Patent ID: 6262904
Filing Date: 2001-07-17
Classification: H02P

Abstract:
A method for controlling a static converter (1) associated with a polyphase current source (2) and a direct voltage source, the said method being designed to make it possible to adjust an electrical and/or magnetic and/or mechanical value of the current source (2), a so-called control value, wherein:synchronization instants t(i) are generated, defined by a periodic clock T,at least one electrical, magnetic or mechanical value is measured, representative of the state of the current source,at least one control value c(t) and its derivative c(t) are calculated from the measured values, and the value cp(t(i)+T) which each control value would have at the following synchronization instant t(i)+T, for the configuration Cc of the static converter at the instant t(i),each control value cp(t(i)+T) is compared with a preselected reference value, a so-called set value and, as a function of the result from the comparison and the configuration of the static converter at each synchronization instant t(i), the configuration of the said static converter is determined which is able to minimize the difference between the control value and the corresponding set value at the following synchronization instant t(i)+T,the derivative at the instant t(i)+T is calculated of a control value, a so-called preferred value, corresponding to the configuration Cc(t(i)+T) at the instant t(i)+T,the switching instant t(i)+tcom is determined between these instants t(i) and t(i)+T making it possible to minimize the difference at the instant t(i)+T between the preferred control value and the corresponding set value,and switching of the static converter is controlled at the instant t(i)+tcom.