Control Method for Protecting Switching Devices in Power Converters in Doubly Fed Induction Generator Power Systems
First Claim
1. A method for operating a power converter in a doubly-fed induction generator (DFIG) system, the DFIG system comprising a DFIG generator and a power converter comprising a line side converter and a rotor side converter connected by a DC bus, each of the line side converter and rotor side converter comprising a plurality of bridge circuits, each bridge circuit comprising a plurality of switching devices, the method comprising:
- monitoring, by a control device, a voltage of the DC bus;
determining, by the control device, a current limit for at least one bridge circuit in the power converter based at least in part on the voltage of the DC bus; and
controlling, by the control device, the at least one bridge circuit in the power converter based at least in part on the current limit,wherein when a current flowing through the at least one bridge circuit in the power converter exceeds the current limit, controlling, by the control device, the at least one bridge circuit in the power converter based at least in part on the current limit comprises disabling the at least one bridge circuit by the control device.
2 Assignments
0 Petitions
Accused Products
Abstract
Systems and methods for protecting switching devices in a power converter in doubly fed induction generator power systems are provided. A DFIG system can include a DFIG generator and a power converter comprising a line side converter and a rotor side converter connected by a DC bus. Each of the line side converter and rotor side converter can include a plurality of bridge circuits. Each bridge circuit can include a plurality of switching devices. A method can include monitoring, by a control device, a voltage of the DC bus of the power converter. The method can further include implementing, by the control device, a switching device protection measure based at least in part on the voltage of the DC bus of the power converter. The switching device protection measure can be operable to protect the switching devices by operating the switching devices within a safe operating area.
-
Citations
20 Claims
-
1. A method for operating a power converter in a doubly-fed induction generator (DFIG) system, the DFIG system comprising a DFIG generator and a power converter comprising a line side converter and a rotor side converter connected by a DC bus, each of the line side converter and rotor side converter comprising a plurality of bridge circuits, each bridge circuit comprising a plurality of switching devices, the method comprising:
-
monitoring, by a control device, a voltage of the DC bus; determining, by the control device, a current limit for at least one bridge circuit in the power converter based at least in part on the voltage of the DC bus; and controlling, by the control device, the at least one bridge circuit in the power converter based at least in part on the current limit, wherein when a current flowing through the at least one bridge circuit in the power converter exceeds the current limit, controlling, by the control device, the at least one bridge circuit in the power converter based at least in part on the current limit comprises disabling the at least one bridge circuit by the control device. - View Dependent Claims (8, 9, 10, 11)
-
-
2. (canceled)
-
3. (canceled)
-
4. (canceled)
-
5. (canceled)
-
6. (canceled)
- 7. (canceled)
-
13. A control system for a doubly-fed induction generator (DFIG) system, the DFIG system comprising at least a DFIG generator and a power converter comprising a line side converter and a rotor side converter connected by a DC bus, each of the line side converter and rotor side converter comprising a plurality of bridge circuits, the control system comprising:
-
a control device configured to perform operations, the operations comprising; determine a voltage of the DC bus; determine a current limit for at least one bridge circuit in the power converter based at least in part on the voltage of the DC bus; and control the at least one bridge circuit in the power converter based at least in part on the current limit; wherein when a current flowing through the at least one bridge circuit in the power converter exceeds the current limit, controlling the at least one bridge circuit in the power converter based at least in part on a current limit comprises disabling the at least one bridge circuit. - View Dependent Claims (14, 15, 16)
-
-
17. A doubly fed induction generator (DFIG) system, comprising:
-
a DFIG generator; a power converter comprising a line side converter and a rotor side converter connected by a DC bus, each of the line side converter and rotor side converter comprising a plurality of bridge circuits, each bridge circuit comprising a plurality of switching devices; a dynamic brake connected to the DC bus; and a control device configured to perform operations, the operations comprising; monitor a voltage of the DC bus of the power converter; and control each of the line side converter, the rotor side converter, and the dynamic brake to a respective operational state based at least in part on the voltage of the DC bus; wherein the operational state for the line side converter and the rotor side converter comprises either an on state or an off state, wherein when operated in the on state, switching is enabled in the plurality of bridge circuits of the respective converter; wherein when operated in the off state, switching is disabled in the plurality of bridge circuits of the respective converter; wherein the operational state for the dynamic brake comprises either a braking state or a non-braking state; wherein energy on the DC bus is dissipated in the dynamic brake in the braking state; and wherein energy on the DC bus is not dissipated in the dynamic brake on the non-braking state. - View Dependent Claims (18, 19, 20)
-
Specification