METHOD FOR OPERATION OF CONVERSION CIRCUIT AND DEVICE FOR REALISATION OF THIS METHOD Russian patent published in 2011 - IPC H02M1/12 

FIELD: electricity.

SUBSTANCE: method to operate conversion circuit, comprising conversion unit (1) with multiple controlled power semiconductor switches and LCL filter (3) connected to each phase output (2) of converter unit (1), in which power semiconductor switches are controlled by means of control signal (S), formed from value (d_p) of active hysteresis power, value (d_p) of reactive power of hysteresis and selected sector of flow (9_F). Value (d_p) of active power of hysteresis is formed from differential value (P_diff) of active power by means of the first hysteresis controller (16), and differential value (P_diff) of active power is formed from result of subtraction of estimated value (P) of active power and value (P_d) of active power of damping from reference value (P_ref) of active power, besides, value (P_d) of active power of damping is formed as follows: result of multiplication of d-component of Park-Clark conversion of voltages (u_TCf,d) filtered by low pass filter on filter capacitances by d-component of Park-Clark conversion of voltages (u_GCf,d) filtered relative to main harmonics of output currents (i_fg1, i_fg2, i_fg3) on capacitances of filters divided into setting damping coefficient (k_d). Value (d_q) of reactive power of hysteresis is formed from differential value (Q_diff) of reactive power by means of the second hysteresis controller (17), and differential value (Q_diff) of reactive power is formed from result of subtraction of estimated value (Q) of reactive power and value (Q) of reactive power of damping from reference value (Q_ref) of reactive power, besides, value (Q_d) of reactive power of damping is formed from negative value as follows: result of multiplication of d-component of Park-Clark conversion of voltages (u_TCf,d) filtered by low pass filter on filter capacitances by q-component of Park-Clark conversion of voltages (u_GCf,d) filtered relative to main harmonics of output currents (i_fg1, i_fg2, i_fg3) on capacitances of filters divided into setting damping coefficient (k_d) . Besides, device for method realisation is described.

EFFECT: damping of output currents distortion and voltages in a simple manner.

18 cl, 5 dwg