METHOD FOR REGULATING POWER OF A GAS TURBINE GENERATOR SYSTEM

Abstract

The method effects control upon engines, in particular to regulating power of a gas-turbine-generator system used in gas-turbine locomotives, hybrid locomotives, etc. A control signal for the fuel metering unit actuator is formed by an electronic engine control system on the basis of processing of a signal from a turbine rpm sensor and a design value of the generator active electric output power. The system power can be preset. A preset power value is compared to a real power calculated value which is obtained according to measured values of current and voltage. An obtained difference is taken as the basis for forming a control signal for the fuel metering unit actuator in order to provide a certain turbine rpm and a control signal for a current regulator supplying energy to the generator excitation winding in accordance with the load curve of the gas turbine-generator system.

Claims

1. A method for regulating power of the gas turbine-generator system, the method comprising the steps of: forming, with an electronic engine control system, a control signal to be sent to a fuel metering unit actuator on the basis of processing a signal received from a turbine rpm sensor and a design value of the generator active electrical output power, presetting system power with an operator's controller according to a locomotive operating mode, comparing a preset value of said system power with a real power calculated value obtained from measured values of current rectified by a traction rectifier and voltage, and forming a control signal based on an obtained difference for said fuel metering unit actuator in order to maintain certain rpm of the turbine and a control signal for a current regulator supplying energy to the generator excitation winding according to a load curve of the gas turbine-generator system.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0013] The FIGURE is an accompanying drawing showing a structural block diagram of the proposed method for regulating power of the gas turbine-generator system in a locomotive.

DETAILED DESCRIPTION OF THE INVENTION

[0014] The gas turbine 1 is connected, via the shaft, to the generator 2 which power outputs are connected to the input lines of the traction rectifier in the locomotive power circuit 3 supplying energy from the battery to the starter 4. The fuel metering unit 5, which is controlled by an electric signal sent by the electronic engine control system 6 (EECS) which inputs receive signals from the power controller 7, the turbine rpm sensor 8, the current sensor 9, and the voltage sensor 10, ensures a required rpm of the gas turbine 1. The current regulator 11 receives energy from the traction rectifier of the power circuit 3 and regulates current in the excitation winding of the generator 2.

[0015] The method for regulating power of the gas turbine-generator system can be implemented as follows.

[0016] In order to start the turbine 1 connected to the generator 2 via the shaft, the starter 4 is used that receives starting electric energy from a battery included into the locomotive power circuit (as such, an asynchronous electric motor receiving energy from a frequency converter may be used). After the turbine 1 is started, the EECS 6 forms an instruction concerning rpm of the gas turbine 1 according to a value of a control signal sent by the power controller 7, which value is compared with a real value received by the EECS 6 from the turbine rpm sensor 8 measuring rpm of the turbine 1. A control instruction for the actuator of the fuel metering unit 5 is formed on the basis of a result of this comparison. At the same time, an initial signal is formed for the current regulator 11 regulating current in the excitation winding of the generator 2. Real values of rectified current and voltage are measured by the current sensor 9 and the voltage sensor 10 which are arranged on the output lines of the traction rectifier included into the locomotive power circuit 3. By using a result of measuring these parameters a real value of electric power is calculated that is compared with a preset value corresponding to a signal received from the power controller 7. According to a comparison result, a control signal is formed for the current regulator 11 providing energy to the excitation winding of the generator 2. In this way output power of the gas turbine-generator system is maintained at a level corresponding to its load curve in the conditions of using in a given locomotive.

[0017] While effecting control upon the gas turbine-generator system, instrumentation means (not shown in the drawing) monitor rpm of the turbine 1, temperatures of the windings of the generator 2, its bearing assemblies, gases downstream the turbine 1. If critical values of the checked parameters are exceeded, the EECS 6 performs protection algorithms correcting control signals for the actuators in the power circuit 3, and, when necessary, an emergency algorithm is performed for stopping the turbine 1, including a signal for closing a shutoff valve (not shown in the drawing).

[0018] The proposed method for regulating power has been tested on a GT1h-002 gas-turbine locomotive and showed good results.