Method and control device for synchronizing a turbine with the current network

Patent metadata

Field	Value
Publication number	US-10305288-B2
Application number	US-201515519168-A
Country	US
Kind code	B2
Filing date	Oct 5, 2015
Priority date	Oct 24, 2014
Publication date	May 28, 2019
Grant date	May 28, 2019

Abstract

A method and associated control device for synchronizing a turbine with an alternating current network having a network frequency, having the following steps: A) accelerating the turbine up to a frequency in the range of the network frequency; B) sensing an angle difference between the turbine and the alternating current network; C) sensing a speed difference between the turbine and the alternating current network; D) accelerating or decelerating the turbine such that the turbine follows a desired trajectory, wherein the desired trajectory is a trajectory calculated in advance that indicates, in dependence on the angle difference, a desired speed difference that should be present such that a target angular position between the turbine and the alternating current network suitable for synchronous feed-in is achieved when the speed of the turbine and the speed of the alternating current network correspond.

First claim

The invention claimed is:

1. A method for the synchronization of a turbine with an AC network at network frequency, the method comprising:
A) acceleration of the turbine to a frequency in the network frequency range;
B) identification of an angular differential between the turbine and the AC network;
C) identification of a speed differential between the turbine and the AC network;
D) acceleration or deceleration of the turbine such that the turbine follows a setpoint trajectory, wherein the setpoint trajectory is a pre-calculated trajectory which, in relation to the angular differential, gives the setpoint speed differential which is required such that, upon the matching of the turbine speed to the AC network, an appropriate target angular position between the turbine and the AC network is achieved for synchronous infeed to proceed.

2. The method as claimed in claim 1 ,
wherein for the acceleration or deceleration of the turbine such that the turbine follows the setpoint trajectory, the method further comprising the following steps executed repeatedly:
E) identification of a setpoint speed differential resulting from the setpoint trajectory, associated with the detection of an angular differential;
F) comparison of the setpoint speed differential with the detected speed differential associated with the detected angular differential;
G) acceleration or deceleration of the turbine such that the setpoint speed differential is at least approximately achieved.

3. The method as claimed in claim 2 ,
wherein steps E) and F) are executed continuously, such that the requisite acceleration or deceleration further to step G) is adjusted continuously.

4. The method as claimed in claim 1 ,
wherein the setpoint trajectory is parabolic.

5. The method as claimed in claim 1 ,
wherein the turbine is accelerated to a frequency above network frequency.

6. The method as claimed in claim 1 ,
further comprising taking into consideration that, in a multi-phase network, a plurality of target angular positions may exist, from which that target angular position is selected which will be achieved the most rapidly.

7. The method as claimed in claim 1 ,
wherein for the step of the acceleration or deceleration of the turbine, the turbine follows the setpoint trajectory until the target angular position is achieved, which is approximately 20 s.

8. A control device for a turbine,
wherein the control device is adapted to control a turbine by a method as claimed in claim 1 .

9. The method as claimed in claim 5 ,
wherein the turbine is accelerated to a frequency approximately 0.25 Hz above network frequency.

Assignees

• Siemens Ag

Inventors

• Heue Matthias
• Zimmer Gerta

Classifications

• H02P9/08

  Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation · CPC title

• F01K13/02 Primary

  Controlling, e.g. stopping or starting · CPC title

• F01D17/24

  electrical · CPC title

• G05B15/02

  electric · CPC title

• H02J3/40 Primary

  Synchronisation of generators for connection to a network or to another generator · CPC title