POWER CONVERTER FOR DOUBLY-FED POWER GENERATOR SYSTEM
First Claim
1. A generator in which a stator side of a doubly-fed generator is connected to a power system and an excitation power converter is connected to secondary windings of said doubly-fed generator to adjust generation of a power to be output from said doubly-fed generator to said power system, wherein:
- said excitation power converter is connected to the secondary windings of said doubly-fed generator via a first impedance;
a diode rectifier is connected in parallel to the second windings of said doubly-fed generator via a second impedance; and
a DC link of said diode rectifier is connected in parallel to a DC link of said excitation power converter,wherein the generator comprises a controller for outputting an on-command to a power semiconductor switching element of said excitation power converter if a value of current flowing in the power semiconductor switching element is a predetermined value or larger.
1 Assignment
0 Petitions
Accused Products
Abstract
An excitation power converter of a doubly-fed generator is protected from excess current to be caused by ground fault or system disturbance and operation continuity of the power converter is ensured. In a power converter system, in order not to flow excess current generated in secondary windings of the doubly-fed generator into the power converter, a rectifier is connected in parallel to the power converter via a reactor, a DC link of the rectifier is connected to a DC link of the power converter, excess current flowing from the secondary windings is separately flowed at a reactor impedance ratio to reduce an amount of current flowing into the power converter, and a semiconductor switching element of an excess current generation arm of the power converter is set to an on-state.
-
Citations
11 Claims
-
1. A generator in which a stator side of a doubly-fed generator is connected to a power system and an excitation power converter is connected to secondary windings of said doubly-fed generator to adjust generation of a power to be output from said doubly-fed generator to said power system, wherein:
-
said excitation power converter is connected to the secondary windings of said doubly-fed generator via a first impedance; a diode rectifier is connected in parallel to the second windings of said doubly-fed generator via a second impedance; and a DC link of said diode rectifier is connected in parallel to a DC link of said excitation power converter, wherein the generator comprises a controller for outputting an on-command to a power semiconductor switching element of said excitation power converter if a value of current flowing in the power semiconductor switching element is a predetermined value or larger. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A generator in which a stator side of a doubly-fed generator is connected to a power system and an excitation power converter is connected to secondary windings of said doubly-fed generator to adjust generation of a power to be output from said doubly-fed generator to said power system, wherein:
-
said excitation power converter comprises a first power converter whose AC terminal side is connected to said second windings via a first impedance and whose DC terminal side is connected to a smoothing capacitor, and a second power converter whose DV terminal side is connected to said smoothing capacitor and whose AC terminal side is connected to the power system; a diode rectifier is connected in parallel to the second windings of said doubly-fed generator via a second impedance; and a DC link of said diode rectifier is connected in parallel to a DC link of said excitation power converter, wherein the generator comprises a controller for outputting an on-command to a power semiconductor switching element of said excitation power converter if a value of current flowing in the power semiconductor switching element is a predetermined value or larger. - View Dependent Claims (7, 8, 9, 10)
-
-
11. A generator in which a stator side of a doubly-fed generator is connected to a power system and an excitation power converter is connected to secondary windings of said doubly-fed generator to adjust generation of a power to be output from said doubly-fed generator to said power system, wherein:
-
said excitation power converter is rotated by a wind mill; said excitation power converter comprises a first power converter whose AC terminal side is connected to said second windings via a first impedance and whose DC terminal side is connected to a smoothing capacitor, and a second power converter whose DC terminal side is connected to said smoothing capacitor and whose AC terminal side is connected to the power system; a diode rectifier is connected in parallel to the second windings of said doubly-fed generator via a second impedance; and a DC link of said diode rectifier is connected in parallel to a DC link of said excitation power converter, wherein the generator comprises a controller for outputting an on-command to an IGBT of said excitation power converter if a value of current flowing in the IGBT is a predetermined value or larger.
-
Specification