METHOD FOR CONTROL OF STATIC STABILISED AC VOLTAGE SOURCES, WORKING IN PARALLEL FOR COMMON LOAD Russian patent published in 2010 - IPC H02M5/297 H02M7/493 H02P13/00 

FIELD: electrical engineering.

SUBSTANCE: in control method, measured instantaneous voltage and current values of each source are transformed from three-phase abc-system of coordinates into two-phase dq-system of coordinates that rotates with constant frequency Ω. As reference signals, reference signals are used accordingly for d- and q-components of source output voltage. As current parametres, accordingly d- and q- components of source current are used. The first comparison signal is formed by integration of reference signal difference for d-component of source voltage and summary signal, which corresponds to difference of d-components in source currents. The second comparison signal is formed by integration of reference signal difference for q-component of source voltage and summary signal, which corresponds to difference of q-components in source currents. Specified differential voltages are formed, accordingly, as difference of d- or q-components of currents in just two sources. Each difference in formation of according summary signals is used just once. Formation of three-phase control voltage of source is carried out by reverse transformation of d- and q-components of comparison result from two-phase dq-system of coordinates into three-phase abc-system of coordinates.

EFFECT: improved stability of amplitude and voltage phase at common load and increased evenness of load current components distribution among sources in static mode.

1 dwg, 1 tbl