Cooperation Of Generators

Reverse power maintenance is also called power direction maintenance. Generally speaking, the power direction of the generator should be the direction of the generator to the bus, but when the generator loses magnetism or some other generator reason, the generator may turn into a motor operation, that is, draw active power from the system. This is the inverse power. When the inverse power reaches a certain value, the generator's maintenance action, or action to signal or action to trip.

The grid-connected turbogenerator operates as a synchronous motor after the main valve of the turbine is closed: it absorbs active power and drags the turbine rolling, which can send reactive power to the system. Because the main valve of the steam turbine has been closed, the tail blade of the steam turbine conflicts with residual steam and forms blast loss, which is damaged by overheating during long time operation. Gas and water turbines are also a major hazard to prime movers. Generator reverse power maintenance main maintenance steam turbine from harm.

Setting calculation of steam turbine inverse power maintenance is to determine the operation power Pdz and action delay T of the maintenance.

1. Action power of Pdz set turbogenerator inverse power maintenance action power can be calculated according to the following formula: Pdz=(Krel*P1)/η Pdz- Inverse power maintenance operation power Krel- reliability coefficient, take 0.8 P1- the power consumed by the turbine to maintain synchronous rotation speed after the main valve is closed, the size of this power is related to the turbine structure and capacity, Also related to the structure of the main steam system of the turbogenerator (pipeline structure and whether there is bypass pipeline, etc.), generally take 1.5~2% of the rated power η- the efficiency when the generator drags the turbogenerator to rotate, take 0.98~0.99 so: Pdz≈ (1.2~1.6%) PN PN- the rated power of the generator. In practice, Pdz= can be 1-1.5% PN.

2. action delay generator inverse power maintenance action delay, should be in accordance with the steam turbine generator after the main valve closed allowed to operate time to set, the allowed time is generally 10~15min. The calculation and operation practice show that when the steam turbine steam system has bypass pipe, the allowable operation time is longer. Therefore, if the maintenance action delay is set according to the time allowed to run after the main steam turbine valve is closed, 5~10min is advisable. After action, it is applied to disengage magnetic field.

In addition, the large turbogenerators in operation mostly use reverse power maintenance to start the program trip loop. At the moment, the action time is generally 1~2s. As for the maintenance of program-controlled inverse power, due to the short operation time, the practical inverse power may be very small in a very short time after the main steam valve point is closed due to the inertia of the turbine and generator, so the fixed value of the inverse power should not be greater than 1%PN.

When the generator has reverse power (external power points to the generator, that is, the generator becomes the motor condition), the reverse power maintenance operation circuit breaker trip. Three phase voltage and two phase current signals need to be collected. Because of the different forms of primary energy, different generators can be made. With the cooperation of water resources and water turbine, a hydro-generator can be made. Because of the difference of reservoir capacity and head drop, hydrogenerators with different capacity and speed can be made. With the use of coal, oil and other resources, and with the boiler, turbine and steam engine, the turbine generator can be made, which is mostly high-speed motor (3000rpm). In addition, there are all kinds of generators using solar, wind, atomic, geothermal, tidal, bioenergy and other energy. In addition, because the working principle of the generator is different, it can be divided into DC generator, asynchronous generator and synchronous generator. The large generators in wide use are synchronous generators.

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