Granted Patent B2

US 12,218,607 · App. 17/416,615 · Granted Feb 4, 2025

Inventors: Rodrigo Alonso Alvarez Valenzuela (Nuremberg, DE); Andreas Lorenz (Erlangen, DE); Dominik Schuster (Diespeck, DE)

Assignee: Siemens Energy Global GmbH & Co. KG

H02M7/483H02M1/327H02M7/4835

Abstract

Claims (24)

1. A method for controlling a power converter, in which a setpoint of a control parameter is limited by at least one limiting value, which comprises the step of:

determining, at predetermined time intervals, several limiting values for several control parameters, with each limiting value for a respective control parameter being determined as a function of a power converter temperature;

selecting at least one limiting value of said several limiting values in a prioritized manner according to requirements placed on the power converter or on an energy transmission;

limiting the setpoint of the control parameter of the power converter based on the at least one limiting value selected;

selecting the control parameter from the group consisting of a reactive current on an AC-voltage side of the power converter, an actual current on the AC-voltage side of the power converter, a current on a DC-voltage side of the power converter, a power converter-internal circulating current, a voltage on the DC-voltage side of the power convert, a voltage on the AC voltage side of the power converter, a frequency on the AC-voltage side of the power converter, a total energy at the power converter, and any linear combination of control parameters; and

controlling the power converter to limit at least one of an active power or a reactive power of the power converter based on the setpoint of the control parameter limited by the at least one limiting value.

2. The method according to claim 1 , wherein the power converter temperature is a semiconductor temperature of a semiconductor switch of the power converter.

3. The method according to claim 2 , wherein the power converter temperature is determined based on a temperature model of the semiconductor switch.

4. The method according to claim 3 , wherein the temperature model contains a power loss model of the semiconductor switch.

5. The method according to claim 3 , wherein the power converter is a modular multistage converter, and the power converter temperature is obtained from at least one of following measurement parameters:

a branch current of a power converter branch of the power converter;

an energy storage device voltage of an energy storage device of a switching module of the power converter; and

a switching state of the switching module.

6. The method according to claim 1 , wherein the power converter temperature is obtained using a temperature measurement at the power converter.

7. The method according to claim 6 , which further comprises measuring a cooling water temperature of cooling water for cooling the power converter.

8. The method according to claim 1 , which further comprises determining at least one limiting value of the several limiting values in dependence on setpoints of further control parameters.

9. A power converter system, comprising:

a power converter; and

a controller for controlling said power converter, said controller configured to:

determine, at predetermined time intervals, several limiting values for several control parameters, with each limiting value for a respective control parameter being determined as a function of a power converter temperature;

select at least one limiting value of said several limiting values in a prioritized manner according to requirements placed on the power converter or on an energy transmission;

limit the setpoint of the control parameter of the power converter based on the at least one limiting value selected; and

select the control parameter from the group consisting of a reactive current on an AC-voltage side of the power converter, an actual current on the AC-voltage side of the power converter, a current on a DC-voltage side of the power converter, a power converter-internal circulating current, a voltage on the DC-voltage side of the power convert, a voltage on the AC voltage side of the power converter, a frequency on the AC-voltage side of the power converter, a total energy at the power converter, and any linear combination of control parameters.

10. The power converter system according to claim 9 , wherein said power converter is a modular multistage converter.

Assignments (2)

Continuity (1)

References Cited (25)