DEVICE FOR CONTROLLING TWO-LEVEL THREE-PHASE VOLTAGE INVERTER Russian patent published in 2025 - IPC H02M7/53862 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and power electronics, namely to conversion of DC energy at the input to AC energy at the output using static converters, which require a continuous control signal. Device for controlling a two-level three-phase voltage inverter contains external control level unit (3), in which stabilization channel unit (6) is connected to a reproduction unit of automatic voltage regulator (7), which is connected to first adder (8). Internal control level unit (4) comprises an automatic frequency and power control unit (10), which is connected to rotor model unit (12), the first and second outputs of which are connected to the electric machine simulation unit (14), to which excitation control unit (15) is connected. Electric machine simulation unit (14) is connected to power calculation unit (16), the outputs of which are connected to excitation control unit (15), to rotor model unit (12), to second (20) and third (19) adders, which are connected to reference current calculation unit (21), which is connected to the unit of internal current control circuit (22), which is connected to the digital signals conversion unit, the output of which is connected to pulse-width modulation unit (26). External control level unit (3) contains the first unit, which sets reactive power setting (9), which is connected to first adder (8). Internal control level unit (4) comprises frequency setting unit (11), which is connected to the automatic frequency and power control unit (10), the first unit setting the active power setting (13), which is connected to rotor model unit (12), the second unit setting the reactive power setting (17), which is connected to excitation control unit (15). Second unit, which sets active power setting (18), is connected to the automatic frequency and power control unit (10) and to third adder (19). Unit for reverse conversion of digital signals is connected to inertial link unit (25), which is connected to the electric machine simulation unit (14), to power calculation unit (16) and to two inputs of current control internal circuit unit (22). Outputs of pulse-width modulation unit (26) are connected to first (27), second (28) and third (29) logical elements NOT and to the first unit of drivers (30). First logic element NOT (27) is connected to second unit of drivers (33). Output of pulse-width modulation unit (26) is connected to the third unit of drivers (31), and second logical element NOT (28) is connected to fourth unit of drivers (34). Output of the pulse-width modulation unit (26) is connected to fifth unit of drivers (32). Third logical element NOT (29) is connected to sixth unit of drivers (35).

EFFECT: wider range of technical means allowing to damp oscillations of operating parameters of a two-level three-phase voltage inverter in electric networks with a low coefficient of short-circuit ratio.

2 cl, 2 dwg