SU892637A1 - Method of starting turbogenerator, remote from turbine into the mode of synchronous compensator - Google Patents

Description

(54) METHOD FOR START-UP OF A TURBO-GENERATOR SEPARATED FROM A TURBINE. IN THE SYNCHRONOUS COMPENSATOR MODE The invention relates to electric power industry and can be used in power systems when starting a turbo generator in a synchronous compressor mode with a separated steam turbine 4 A known method of starting a turbo generator disconnected from a turbine in a synchronous compensator mode by raising the rotation frequency from zero from another generator 1. Such a start is called frequency 1. Its disadvantage is the need to use a slave turbo for deployment. for generators supplementary lead (yawing) of the generator and recovering hydrochloric reserve bus system. Both of these factors reduce the reliability of the power system as a whole. Frequency frequency is also uneconomical, since the lead unit for frequency start must re-develop after stopping together with the slave turbo generator. The frequency start application is limited due to the fact that modern turbo generators having rotors with direct cooling of the winding with hydrogen, due to lack of ventilation at the initial stage of a turn, when supplying the rotor winding for a few minutes with direct current in the order of the no-load current, use undershoot steady There is also known a method of starting the CHHXpoHHfcw turbogenerator with a compensator used to hydraulically lift the rotor, and then the synchronous machine turns from a stationary state to the subsynchronous revolutions using an exciter as the booster engine 2, but in order to reduce the starting torque of the turbo exciter of the stand-alone engine lubricant system, it requires the engine exciter engine 2, in order to reduce the starting torque of the engine revolving engine turbogenerator bearings for hydraulically lifting the rotor by pumping high pressure oil into the bearings through special veneer Implementation of the hydraulic lift reduces the time of moving the rotor insufficiently efficiently (there is a 3.5-fold overload of the rotor on the current), which reduces the reliability of operation of the unit as a whole.

The purpose of the invention is to increase the reliability of operation of the turbogenerator and reduce labor costs when it is launched into the synchronous compensator mode with a separated turbine.

This goal is achieved in that according to the method of starting a turbo-generator with a synchronous compensator, by accelerating the rotor of the turbo-generator with an exciter, at the initial moment of starting the stator and rotor of the turbo-generator are connected in series to the DC source, and then the above-mentioned overclocking is performed.

The drawing shows a structural scheme for starting a synchronous turbogenerator into a synchronous compensator mode implementing the proposed method.

The circuit contains a source of direct current 1, switching equipment 2 and 3, a high-voltage switch 4, windings of the stator 5 and the rotor 6 of the turbine generator, automatic floor-extinguishing machine 7, turbo-exciter 8, backup exciter 9 and its asynchronous drive 10.

The turbo-generator start-up by the synchronous compensator is carried out as follows.

The electrical circuits of the turbo-exciter 8 and one of the backup exciters 9 are assembled according to the scheme of a current-generator-motor. The asynchronous motor 10 of the backup exciter is turned on and by acting on regulating devices in the independent excitation of both DC machines in the core of the turbo exciter 8, a current of the nominal order is established to create an electromagnetic moment exceeding the total mechanical loss of the turbogenerator. Then, a constant voltage is applied from the direct current source 1 (battery battery or other backup station driver) to the series-connected windings 5 and the rotor 6 of the turbogenerator. Due to the interaction of the electromagnetic fields of the windings of the turbogenerator, an electromagnetic moment arises, which is necessary to overcome friction rest in the rotor bearings. Immediately after the start of the movement of the rotor shaft 6, switching off the automaton 7 extinguishes the field of the machine. The turbogenerator rotor shaft, coupled by the half coupling to the shaft of the turbo exciter 8, is accelerated due to excess torque to the subsynchronous rotational speed. In the process of turning the shaft of the unit by disconnecting additionally the mounted switching devices in the phase windings of the stator 2 and in neutral 3, the normal circuit in the stator circuit of the turbogenerator is reestablished and when the subsynchronous speed is reached, the turbogenerator is switched on to the network by the switch 4. The turbocharger core 8 is disconnected from the backup driver 9 and the normal excitation circuit of the turbogenerator is restored. With

 by increasing the current in the rotor winding b from the main driver 8, the generator is synchronized and then gains reactive power. Pre indication operation

5, the orientation of the rotor relative to the stator before starting the turbogenerator in the clamp of a synchronous compensator can be carried out under operating conditions using pneumonic

0 diagrams showing on the fixed and rotating structural elements of the generator the position of said axes of the rotor and stator windings.

The use of the proposed method of launching a turbogenerator separated from the turbine into a synchronous compensator mode provides the following advantages compared with existing methods:

a) the possibility of reducing labor costs due to the rejection of the implementation of a device for hydro-raising the rotor to reduce the moment of moving the rotor;

b) the possibility of a sharp reduction in turbulent overload in the initial stage of start-up, which allows to increase its durability and, consequently, the reliability of operation of the turbogenerator as a whole

c) creating prerequisites for automating the start-up process in connection with

simplifying the control of turbo excitation operation mode.

Claims (2)

1.Grudinsky P.G. and others. Technical operation of the main electrical equipment of stations and substations. 0 M., Energie, 1974, p. 70-85. 2. Levshits G.L. and others. Start of a turbogenerator with a synchronous compensator using an exciter in quality I Electric overclocking engine. 5 stations, 9, 1975: