H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/22
H02M 1/084 (2006.01) H02M 7/00 (2006.01) H02M 7/162 (2006.01)
Patent
CA 1224244
ABSTRACT OF THE DISCLOSURE The orthogonal components of the voltage vector of an a-c voltage network are transformed by means of a vector rotator, smoothed and transformed back. The frequency of the transformation elements required for the transformation in the vector rotator is set during a network disturbance under controlled conditions in accordance with a stored frequency value. After the end of the network disturbance, the direction given by the smoothed transformed orthogonal components is controlled to a reference value in that the frequency of the transformation elements is readjusted according to the direction deviation. The phase of the transformation elements determines the phase of the co-system fundamental of the network. A counter system fundamental can also be taken into consideration. Also if the returning power network contains asymmetrical and harmonic containing transients, a reference voltage synchronous with the fundamental can be obtained thereby within a few milliseconds for synchronizing network controlled converters.
470486
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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