METHOD TO CONTROL STATIC STABILISED SOURCES OF AC VOLTAGE OPERATING IN PARALLEL FOR COMMON LOAD Russian patent published in 2013 - IPC H02J3/46 

FIELD: electricity.

SUBSTANCE: instantaneous value of common voltage is measured, as well as instantaneous values of output currents of sources, they are converted from a three-phase abc-system of coordinates into a rotary double-phase dq-system of coordinates, reference signals are generated for d- and q-components of common voltage, signals proportional to d- and q-components of common voltage, signals proportional to d- and q-components of currents of sources, the first and second differential signals, the first and second signals of comparison by means of integration of appropriate first and second differential signals, d- and q-components of a control signal are generated, modulating signals are generated by reverse conversion into a three-phase abc-system of coordinates, one of parallel operating sources is selected as master, and other ones - as slave, besides, the first and second differential signals of a master source are generated by subtraction of signals, proportional to d- and q-components of common voltage, from reference signals, for master sources the first and second differential signals are generated by subtraction of a signal proportional to d- and q-components of its current from a signal proportional to d- and q-components of the master source current, and the specified d- and q-components of control signals are generated by summation of signals of comparison and signals proportional to d- and q-components of currents of sources.

EFFECT: increased accuracy of specified distribution of load current between parallel operating sources.

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