Generator excitation control system of gas turbine type emergency power supply vehicle

Abstract

The utility model belongs to the technical field of gas turbine type emergency power supply vehicles, and particularly discloses a generator excitation control system of a gas turbine type emergency power supply vehicle, which comprises an alternating current contactor used for being connected with a permanent magnet machine and controlling the access of excitation; the relay is used for controlling on-off of the alternating current contactor; the power supply is used for providing electric energy for the relay; the circuit breaker is used for executing on-off of a loop; the device is mainly composed of the alternating current contactor, the relay and the circuit breaker, the alternating current contactor is used for controlling access of excitation, the device is in an off state when the starting rotation speed is below 80%, no load is guaranteed in the starting process, meanwhile, the starting torque can be reduced, the device is always in an on state after the rotation speed is 80% and in the shutdown countdown process, and the device is safe and reliable. In the stage, driving power is provided by fuel oil, sufficient power is ensured, and at the moment, the machine halt phenomenon cannot be generated when excitation is connected.

Description

Technical Field

[0001] This utility model relates to the technical field of gas turbine emergency power vehicles, specifically to a generator excitation control system for a gas turbine emergency power vehicle. Background Technology

[0002] For the generator in a 10.5kV 3000kW gas turbine emergency power vehicle, ensuring its stable operation is crucial. Currently, the generator control method in this vehicle primarily relies on voltage regulation control. This control mainly revolves around the excitation system and power output, monitoring and adjusting the generator's output voltage to ensure it remains within the standard range. The excitation system regulates the generator's magnetic field strength, thus affecting the output voltage and current. As the generator's power source, the gas turbine's output power must meet the generator's load-bearing requirements.

[0003] However, during startup, a load is generated after the excitation is connected. If the power required to drive the generator is insufficient, the generator will shut down. Factors contributing to insufficient power include: improper excitation current adjustment, such as setting it too low, may result in insufficient electromagnetic force generated by the generator, which cannot overcome the load resistance, thus causing insufficient power; if the gas turbine itself has insufficient output power, or its performance deteriorates due to wear, aging, or other reasons, it will not be able to provide enough power to drive the generator. Therefore, we need to propose a generator excitation control system for a gas turbine-type emergency power vehicle to solve the aforementioned power shortage problem. This system can ensure sufficient power by controlling the on / off state of the excitation connection, bypassing the moment the generator starts running, and reconnecting the excitation after the fuel is running. Utility Model Content

[0004] The purpose of this utility model is to provide a generator excitation control system for a gas turbine-type emergency power vehicle. By controlling the on / off state of the excitation connection, that is, bypassing the moment when the motor is running, the excitation is connected after the fuel is running, thus ensuring sufficient power and solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a generator excitation control system for a gas turbine-type emergency power vehicle, comprising: an AC contactor for connecting a permanent magnet generator, wherein the AC contactor controls the excitation input, and the AC contactor is in an open state when the starting speed is below 80% and in a closed state when the starting speed exceeds 80%.

[0006] A relay for controlling the on / off state of an AC contactor and a power supply for providing power to the relay, wherein one end of the normally open contact of the relay is connected to the AC contactor, and the relay is provided with an A2 coil for receiving PLC excitation control signals and an A1 coil for connecting to the power supply.

[0007] A circuit breaker used to perform circuit switching, the circuit breaker being connected to the other end of the normally open contact of a relay, and the end of the circuit breaker away from the relay being connected to the positive terminal of the power supply.

[0008] Preferably, the AC contactor is also provided with an A1 coil and an A2 coil. The A2 coil of the AC contactor is connected to one end of the normally open contact of the relay, and the A1 coil of the AC contactor is connected to the negative terminal of the power supply.

[0009] Preferably, the AC contactor is provided with a normally open contact for connection to a permanent magnet motor, and one end of the normally open contact of the AC contactor is connected to a voltage regulator.

[0010] Preferably, when the normally open contact of the relay is closed, the A1 coil and A2 coil on the AC contactor are energized, and the normally open contact on the AC contactor is closed at the same time.

[0011] Preferably, the relay's A2 coil is connected to a PLC for connecting to a generator set, and the generator set connected to one end of the PLC has two gas turbines.

[0012] Preferably, the relay is activated when the speed of any one of the gas turbines exceeds 80%, and is deactivated when the speeds of both gas turbines are below 80%.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model mainly consists of an AC contactor, a relay, and a circuit breaker. The AC contactor controls the excitation connection. It is in the disconnected state when the starting speed is below 80%, ensuring that there is no load during the start-up process and also reducing the starting torque. After 80% speed and during the shutdown countdown, it is in the closed state. During this stage, the power for rotation is provided by fuel to ensure sufficient power. At this time, the excitation connection will not cause a shutdown. Attached Figure Description

[0015] Figure 1 This is a system block diagram of the generator excitation control system for the gas turbine-type emergency power vehicle of this utility model;

[0016] Figure 2 This is a circuit diagram of the generator excitation control system for the gas turbine-type emergency power vehicle of this utility model. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1 and Figure 2 This utility model provides a generator excitation control system for a gas turbine-type emergency power vehicle, including an AC contactor for connecting a permanent magnet generator, a relay for controlling the on / off state of the AC contactor, a power supply for providing power to the relay, and a circuit breaker for executing the on / off state of the circuit.

[0019] The AC contactor controls the excitation connection. The AC contactor is in the open state when the starting speed is below 80% and in the closed state when the starting speed exceeds 80%. This ensures that the excitation connection is cut off within a certain speed range during the start-up process, avoiding shutdown due to load when the power is insufficient, and also reducing the starting torque.

[0020] The AC contactor is also equipped with coils A1 and A2. Coil A2 of the AC contactor is connected to one end of the normally open contact of the relay. Coil A1 of the AC contactor is connected to the negative terminal of the power supply, so that excitation can be connected when any one of the gas turbines reaches a speed of 80% or more during startup, and excitation can be disconnected when both gas turbines are below 80%.

[0021] The AC contactor is equipped with normally open contacts for connecting to the permanent magnet generator. One end of the normally open contact of the AC contactor is connected to a voltage regulator. The voltage is regulated by the voltage regulator so that it can provide a stable excitation current to the generator rotor, thereby completing the excitation control.

[0022] One end of the normally open contact of the relay is connected to an AC contactor. The relay is equipped with an A2 coil for receiving PLC excitation control signals and an A1 coil for connecting to a power supply, so that the PLC can detect the gas turbine speed and control the on / off state of the relay based on the detected gas turbine speed.

[0023] When the normally open contact of the relay is energized, the A1 and A2 coils on the AC contactor are energized, and the normally open contact on the AC contactor is energized at the same time to facilitate the connection of excitation.

[0024] The relay's A2 coil is connected to a PLC for connecting to a generator set, and the generator set connected to one end of the PLC has two gas turbines.

[0025] The relay is activated when the speed of any one of the gas turbines exceeds 80%, and is deactivated when the speeds of both gas turbines are below 80%, thus disconnecting the excitation connection.

[0026] The circuit breaker is connected to the other end of the normally open contact of the relay, and the end of the circuit breaker away from the relay is connected to the positive terminal of the power supply, so that the power supply can provide power to the excitation control system.

[0027] like Figure 2 As shown, in the excitation control system, the AC contactor KM1 controls the excitation connection. It is in the disconnected state when the starting speed is below 80% to ensure that there is no load during the start-up process, and at the same time, the starting torque is also smaller. However, it is in the closed state after 80% speed and during the shutdown countdown. During this stage, the power for rotation is provided by fuel to ensure sufficient power. At this time, the excitation connection will not cause a shutdown.

[0028] Relay KA1 controls the on / off state of KM1. Its A2 coil is connected to the relevant excitation control terminal of the PLC, and its A1 coil is connected to the negative terminal of the power supply. The designed control logic is that when the generator set starts, if either of the two gas turbines reaches a speed of 80% or more, the normally open contact of KA1 will close, the coil of KM1 will be energized and conduct, and its relevant normally open contact will close, thus energizing the generator. When the speed of both gas turbines is below 80%, KA1 will not be energized.

[0029] During operation, circuit breaker Q1 is closed first, and power is connected to the excitation control system. When the PLC detects that the speed of any gas turbine reaches more than 80%, it sends an electrical signal, and the coils A1 and A2 of relay KA1 are energized and conduct. The normally open contact of relay KA1 is energized, and power is supplied to the coils A1 and A2 of AC contactor KM1 to make them conduct. At this time, the three normally open contacts of AC contactor KM1 are closed, and the permanent magnet generator (PMG) provides a constant voltage to the automatic voltage regulator (AVR) through this circuit. The voltage regulator (AVR) provides excitation current to the rotor, completing the excitation control.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A generator excitation control system for a gas turbine-type emergency power vehicle, characterized in that: include: An AC contactor is used to connect to a permanent magnet motor. The AC contactor controls the excitation input. The AC contactor is in an open state when the starting speed is below 80% and in a closed state when the starting speed exceeds 80%. A relay for controlling the on / off state of an AC contactor and a power supply for providing power to the relay, wherein one end of the normally open contact of the relay is connected to the AC contactor, and the relay is provided with an A2 coil for receiving PLC excitation control signals and an A1 coil for connecting to the power supply. A circuit breaker used to perform circuit switching, the circuit breaker being connected to the other end of the normally open contact of a relay, and the end of the circuit breaker away from the relay being connected to the positive terminal of the power supply.

2. The generator excitation control system of a gas turbine-type emergency power vehicle according to claim 1, characterized in that: The AC contactor is also equipped with coils A1 and A2. Coil A2 of the AC contactor is connected to one end of the normally open contact of the relay, and coil A1 of the AC contactor is connected to the negative terminal of the power supply.

3. The generator excitation control system of a gas turbine-type emergency power vehicle according to claim 2, characterized in that: The AC contactor is provided with a normally open contact for connection to a permanent magnet motor, and one end of the normally open contact of the AC contactor is connected to a voltage regulator.

4. The generator excitation control system of a gas turbine-type emergency power vehicle according to claim 3, characterized in that: When the normally open contact of the relay is closed, the A1 and A2 coils on the AC contactor are energized, and the normally open contact on the AC contactor is closed at the same time.

5. The generator excitation control system of a gas turbine-type emergency power vehicle according to claim 1, characterized in that: The relay's A2 coil is connected to a PLC for connecting to a generator set, and the generator set connected to one end of the PLC has two gas turbines.

6. The generator excitation control system of a gas turbine-type emergency power vehicle according to claim 5, characterized in that: The relay is activated when the speed of any one of the gas turbines exceeds 80%, and is deactivated when the speeds of both gas turbines are below 80%.

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