Self-powered system of medium-pressure gas turbine type emergency power supply vehicle

Abstract

The utility model relates to a medium-pressure gas turbine type power van for supplying power. The self-powered system of the power van is small in size, low in cost, convenient to maintain and capable of achieving alternating current self-supply. The self-powered system of the medium-voltage gas turbine type emergency power supply vehicle comprises a direct current motor starting device which is used for providing a controlled working power supply for a direct current motor in an electric state and driving a gas turbine to operate; the direct current motor constant current source is used for providing an excitation power supply when the direct current motor works and is in a power generation state; the charging and discharging device is used for storing the electric quantity converted by the gas turbine through the direct-current motor in a power generation state and is controlled to form direct-current and alternating-current conversion to form alternating-current output; the state switching circuit is used for forming enabling switching between circuits according to the working state of the direct current motor; the direct current motor is used for starting the gas turbine or driven by the gas turbine to generate electricity.

Description

Technical Field

[0001] This utility model relates to the field of emergency power supply, and in particular to a self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle. Background Technology

[0002] Emergency power vehicles, due to their high mobility and maintainability, have been widely used in public security, fire protection, communications, meteorology, municipal construction and other fields to provide power support for rescue and relief efforts in various natural disasters and emergencies.

[0003] Currently used 10.5kV high-voltage emergency power vehicles typically use a semi-trailer chassis as a platform to install a 10 / 0.4kV transformer inside the vehicle, which then transforms the voltage to obtain AC power. The disadvantages are that the transformer is expensive, large in size, occupies a lot of space, is not conducive to power conversion with gas turbines, and has complex daily maintenance requirements. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a small-sized, low-cost, easy-to-maintain, AC self-supplying medium-pressure gas turbine emergency power vehicle self-powering system.

[0005] This utility model discloses a self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle. It includes a DC motor starting device for providing controlled power to the DC motor in motoring mode, driving the gas turbine. A DC motor constant current source provides excitation power to the DC motor in generator mode. A charging / discharging device stores the electricity converted by the gas turbine through the DC motor in generator mode and controls the DC-AC conversion to generate AC output. A state switching circuit enables switching between circuits based on the DC motor's operating state. The DC motor drives the gas turbine in motoring mode, starting it and reaching its rated speed; in generator mode, it cuts the magnetic field under the drive of the gas turbine to generate induced current.

[0006] This utility model discloses a self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle. The DC motor starting device includes a first battery pack, a second battery pack, and a starter box. The positive terminal of the first battery pack is connected to the input terminal of the starter box, the output terminal of the starter box is connected to the positive input terminal of the DC motor power supply, and the negative input terminal of the DC motor power supply is connected to the negative terminal of the first battery pack to form a circuit. The second battery pack is connected in parallel with the first battery pack.

[0007] This utility model discloses a self-powered system for a medium-pressure gas turbine-type emergency power vehicle. The DC motor starting device further includes a first relay, a second relay, and a third relay. The first relay is a single-pole single-throw relay, and the second and third relays are both single-pole double-throw relays. The control circuits of the second and third relays are connected in parallel and in series with the normally open contact of the first relay. The second and third relays are respectively arranged in parallel circuits between the positive and negative terminals of the first and second battery packs. A series branch is provided between the negative terminal of the first battery pack and the positive terminal of the second battery pack, and the normally open contacts of the second and third relays are arranged in the series branch.

[0008] This utility model discloses a self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle. The charging and discharging device includes a third battery pack and an inverter. The first positive terminal of the third battery pack is connected to the positive input terminal of the DC motor power supply, and the first negative terminal is connected to the negative input terminal of the DC motor power supply. The second positive terminal of the third battery pack is connected to the positive terminal of the DC power input terminal of the inverter, and the second negative terminal is connected to the negative terminal of the DC power input terminal of the inverter.

[0009] This utility model discloses a self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle, wherein the constant current source input terminal of the DC motor is connected to an AC power output terminal of the inverter, and the output terminal is connected to the excitation coil of the DC motor.

[0010] This utility model discloses a self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle, wherein another AC output terminal of the inverter is connected to an oil supply pump.

[0011] This utility model discloses a self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle. The state switching circuit includes a fourth relay, a fifth relay, and a sixth relay. The normally open contact of the fourth relay is located on the branch between the DC motor constant current source and the excitation coil. The normally open contact of the sixth relay is located on the branch between the input terminal of the oil supply pump and the AC output terminal of the inverter. The control circuit coil of the sixth relay is connected in parallel with the oil supply pump and in series with the normally open contact of the fifth relay.

[0012] This utility model discloses a self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle. The state switching circuit further includes a circuit breaker. A first circuit breaker is provided between the positive input terminal of the DC motor power supply and the positive terminal of the third battery pack. A second circuit breaker is provided between the input terminal of the oil pump and the AC power output terminal of the inverter. A third circuit breaker is provided between the input terminal of the DC motor constant current source and the AC power output terminal of the inverter. A fourth circuit breaker is provided between the DC power input terminal of the inverter and the output terminal of the third battery pack.

[0013] The self-powered system of this medium-pressure gas turbine emergency power vehicle differs from existing technologies in that it eliminates the need for a dedicated transformer to supply 220V AC power to the generator set. Instead, a DC motor is installed on the gas turbine, and a first and second battery bank connected in parallel provides starting current. The parallel battery banks can be converted into a series connection through the control of the first, second, and third relays, thereby increasing the starting voltage of the DC motor. After the DC motor drives the gas turbine from a standstill to 48% of its rated speed, the DC motor is de-energized. Once the gas turbine reaches its rated speed, it drives the DC motor to rotate through the accessory transmission housing. At this time, the excitation coil of the DC motor is energized through the starter box to create a magnetic field. According to Faraday's law of electromagnetic induction, the DC motor begins to generate electricity under the drive of the gas turbine. The current then flows into the third battery bank, and is subsequently converted into 220V AC current by an inverter and fed into a constant current source, thus achieving the purpose of self-supplying AC power.

[0014] When a DC motor is used as a generator, the magnitude of the generated voltage is related to the magnitude of the excitation current. A larger excitation current results in a larger generated voltage, and a smaller excitation current results in a smaller generated voltage. When a DC motor is used as a starter, the excitation current and armature current are supplied by the battery flowing into the starter box. When used as a generator, the excitation current is supplied by a constant current source.

[0015] This novel self-powered power supply system for a medium-pressure gas turbine-type emergency power vehicle has at least the following beneficial effects:

[0016] This system efficiently converts two energy forms by combining the motor's electric and generator operating states with the gas turbine's start-up and self-sustaining phases. The energy conversion process simplifies the onboard transformer circuitry and equipment configuration while ensuring power supply efficiency. It enables AC self-supply and on-demand output, effectively reducing overall costs, minimizing the size of the emergency power vehicle, making it more flexible and convenient to use, and simplifying maintenance.

[0017] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a power supply diagram of a self-powered system for a medium-pressure gas turbine-type emergency power vehicle according to the present invention;

[0019] Figure 2 This is a schematic diagram of the connection relationship of the self-powered system of a medium-pressure gas turbine type emergency power vehicle according to this utility model.

[0020] Figure label:

[0021] DC motor starting device-1; charging and discharging device-2; state switching circuit-3; control system-4; excitation coil-5; series branch-6; DC motor-1M; oil supply pump-2M; first battery pack-BT1; second battery pack-BT2; third battery pack-BT3; starter box-QDX1; first relay-KA1; second relay-KM1; third relay-KM2; fourth relay-KA2; fifth relay-KA3; sixth relay-KM3; DC motor constant current source-HL1; diode-V11; fuse-FU1; computer-PC; socket-XS03; uninterruptible power supply-UPS; first circuit breaker-Q1, second circuit breaker-Q2, third circuit breaker-Q3, fourth circuit breaker-Q4, fifth circuit breaker-Q5; inverter-VC1. Detailed Implementation

[0022] This utility model relates to a self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle. Figure 1 In this embodiment, the following are included:

[0023] The DC motor starting device 1 is used to provide controlled power to the DC motor 1M when it is in electric mode, so as to drive the gas turbine to run.

[0024] Those skilled in the art will understand that the rotor of the DC motor 1M is in an electric state when actively rotating, driving the shaft-connected components to rotate, and in a generator state when passively rotating, converting mechanical energy into electrical energy. Through proper circuit design, the DC motor 1M can be effectively switched between these two states according to control commands or signals.

[0025] By controlling the operating current or voltage of the DC motor 1M in motoring mode, the power output of the DC motor 1M can be changed, thereby altering the speed or torque of the gas turbine shaft connected to the DC motor 1M. This shaft connection can be achieved through gear sets or other common proportional transmission structures.

[0026] The DC motor constant current source HL1 is used to provide excitation power to the DC motor 1M when it is operating in generator mode.

[0027] By providing excitation current to the rotor excitation coil 5 of the DC motor 1M in a timely manner, the power state of the electromechanical conversion when the DC motor 1M is operating in the generator state can be controlled, thus forming a controlled regulation of the converted power.

[0028] The charging and discharging device 2 is used to store the electricity converted by the gas turbine through the DC motor 1M during the power generation state and to control the DC-AC conversion to form AC output.

[0029] The DC power generated by the DC motor 1M in its generating state can be stored in a battery. The DC power can be controlled by AC-DC conversion circuits such as inverter VC1 to generate the required AC power output.

[0030] The state switching circuit 3 is used to switch the enable between circuits according to the working state of the DC motor 1M.

[0031] Those skilled in the art will understand that controlled circuit breakers and relays are installed between parallel or series circuit devices or in the device circuit to switch or disconnect the circuit devices, thereby changing the corresponding circuit operating state.

[0032] The DC motor 1M, when in motor mode, drives the gas turbine to start and reach its rated speed; when in generator mode, it cuts the magnetic field to generate induced current under the drive of the gas turbine.

[0033] This embodiment of the utility model's medium-pressure gas turbine-type emergency power vehicle self-powering system utilizes the electric and generator operating states of the DC motor (1M) combined with the gas turbine's start-up and self-sustaining phases to achieve efficient conversion between two energy forms. During energy conversion, the system simplifies the onboard transformer circuit structure and equipment configuration while ensuring power supply efficiency. It can achieve AC self-supply and on-demand output. This effectively reduces overall costs, shrinks the size of the emergency power vehicle, makes it more flexible and convenient to use, and facilitates maintenance.

[0034] like Figure 1 As shown, the DC motor starting device 1 includes a first battery pack BT1, a second battery pack BT2, and a starter box QDX1. The positive terminal of the first battery pack BT1 is connected to the input terminal of the starter box QDX1, the output terminal of the starter box QDX1 is connected to the positive input terminal of the DC motor 1M power supply, and the negative input terminal of the DC motor 1M power supply is connected to the negative terminal of the first battery pack BT1 to form a circuit. The second battery pack BT2 is connected in parallel with the first battery pack BT1.

[0035] The DC motor 1M can be used as a starter or a generator. When used as a starter, it receives starting current through the DC motor starting device 1. During startup, the first battery pack BT1 and the second battery pack BT2, connected in parallel, supply power to the starter box QDX1 at a voltage of 24V. The starter box QDX1 controls the flow of current into the DC motor 1M, ensuring stable operation. The DC motor 1M is protectively grounded to prevent the equipment from becoming energized due to insulation damage, thus improving safety. After current stabilization by the starter box, the current is delivered to the positive input terminal of the DC motor 1M power supply, ensuring a constant and continuous current to power the DC motor 1M. The DC motor 1M, when energized, drives the gas turbine meshing with its gears to rotate, thereby starting the gas turbine. After startup, its speed gradually increases to the rated speed.

[0036] like Figure 1 As shown, in one embodiment of this utility model, a fuse FU1 is connected in series in the power supply circuit of the starter box QDX1 to prevent overload and short circuit of the circuit system. Since there are many energized electronic components in the entire circuit system, fuses FU1 can also be installed in other circuits as needed to ensure the stability of the circuit and the safety of each electronic component in the circuit.

[0037] like Figure 1 As shown, in one embodiment of this utility model, the DC motor starting device 1 further includes a first relay KA1, a second relay KM1 and a third relay KM2. The first relay KA1 is a single-pole single-throw relay, and the second relay KM1 and the third relay KM2 are both single-pole double-throw relays. The control circuits (e.g., electromagnetic coils) of the second relay KM1 and the third relay KM2 are connected in parallel and form a series connection with the normally open contact of the first relay KA1.

[0038] The normally closed contact of the second relay KM1 is located and connected in the branch connecting the negative terminal of the first battery pack BT1 to the DC motor 1M. The normally closed contact of the third relay KM2 is located and connected in the branch connecting the positive terminal of the second battery pack BT2 to the positive terminal of the first battery pack BT1. (That is, the second relay KM1 and the third relay KM2 are respectively located in the parallel circuit between the positive and negative terminals of the first battery pack BT1 and the second battery pack BT2.) A series branch 6 is provided between the negative terminal of the first battery pack and the positive terminal of the second battery pack. The normally open contacts of the second relay KM1 and the third relay KM2 are located in this series branch 6. The normally closed contact of the second relay KM1 connects the negative terminal of the first battery pack BT1 to the negative input terminal of the DC motor 1M. The normally closed contact of the third relay KM2 connects the branch between the positive terminals of the first battery pack BT1 and the positive terminals of the second battery pack BT2.

[0039] After the first relay KA1 is energized and closed, the normally open contacts of the second relay KM1 and the third relay KM2 close, connecting the series branch 6 and converting the parallel second battery pack BT2 and the third battery pack BT3 into a series connection, increasing the voltage from DC24V to DC48V. By changing the operating voltage of the DC motor, the torque and speed of the DC motor during startup are altered, enabling the gas turbine to reach self-sustaining operation as quickly as possible.

[0040] The first relay KA1 is controlled by the upper control system 4. When the first relay KA1 receives the electrical signal from the upper control system 4, its normally open contact closes. Then the coils of the second relay KM1 and the third relay KM2 are energized, their normally closed contacts open and their normally open contacts close. At this time, the normally open contacts of the second relay KM1 and the third relay KM2 are connected, and the parallel first battery pack BT1 and the second battery pack BT2 are converted to series connection.

[0041] The current direction after series connection is as follows: the current flows from the positive terminal of the second battery pack BT2 through the third relay KM2 and the second relay KM1, into the negative terminal of the first battery pack BT1, then from the positive terminal of the first battery pack BT1 into the starter box QDX1, then from the starter box QDX1 into the DC motor 1M to supply power, and finally from the DC motor 1M back to the negative terminal of the second battery pack BT2 to form a circuit. After series connection, the voltage is increased from DC24V to DC48V. Due to the increased voltage, the speed of the DC motor 1M increases. When the DC motor 1M is used as a starter, it can drive the gas turbine to its rated speed more quickly, improving working efficiency.

[0042] like Figure 1 As shown, in one embodiment of this utility model, in order to prevent reverse current input from damaging electronic components, a unidirectional diode V11 can be provided on the control circuit of the first relay KA1, the second relay KM1 and the third relay KM2.

[0043] like Figure 1 As shown, in one embodiment of this utility model, the charging and discharging device 2 includes a third battery pack BT3 and an inverter VC1. The first positive terminal of the third battery pack BT3 is connected to the positive input terminal of the DC motor 1M power supply, and the first negative terminal is connected to the negative input terminal of the DC motor 1M power supply. The second positive terminal of the third battery pack BT3 is connected to the positive terminal of the DC power input terminal of the inverter VC1, and the second negative terminal is connected to the negative terminal of the DC power input terminal of the inverter VC1.

[0044] The charging and discharging device 2 includes a third battery pack BT3 and an inverter VC1. After the gas turbine is started by the DC motor 1M and reaches its rated speed, the starter box QDX1 cuts off the current to the DC motor 1M and stops supplying it with power. The gas turbine drives the output shaft of the DC motor 1M, which meshes with its gear, to rotate through the accessory transmission housing. At this time, the DC motor 1M is used as a generator. The generated electrical energy flows out from the positive input terminal of the DC motor 1M and then flows into the first interface of the positive terminal of the third battery pack BT3. The electrical energy is stored through the third battery pack BT3. Then the current flows out from the second interface of the positive terminal of the third battery pack BT3 and flows into the DC power input terminal of the inverter VC1. After the inverter VC1 converts the DC power into 220V AC power, it is output to the electrical device through different ports.

[0045] The inverter VC1 has multiple output ports on its AC output side. In addition to the output port that connects to the DC motor constant current source HL1, it also includes output ports that connect to the fuel supply pump 2M that supplies fuel to the gas turbine and the computer PC that monitors the operating data of the DC motor 1M.

[0046] like Figure 1 As shown, in one embodiment of this utility model, the input terminal of the DC motor constant current source HL1 is connected to an AC power output terminal of the inverter VC1, and the output terminal is connected to the excitation coil 5 of the DC motor 1M.

[0047] The input terminal of the DC motor constant current source HL1 is connected to one port of the AC power output terminal of the inverter VC1. The output terminal of the DC motor constant current source HL1 is connected to the input terminal of the excitation coil 5 of the DC motor 1M to form a circuit. Thus, the electrical energy generated by the DC motor 1M is converted into 220V AC power by the inverter VC1 and flows into the DC power constant current source. After being regulated and rectified by the inverter, it flows into the excitation coil 5 of the DC motor 1M to provide it with excitation current.

[0048] When the DC motor 1M is used as a generator, the gas turbine drives the rotor of the DC motor 1M to rotate. The constant current source HL1 of the DC motor continuously provides excitation current to the excitation coil 5 in the rotor of the DC motor 1M, thereby generating a magnetic field. According to Faraday's principle of electromagnetic induction, the DC motor 1M cuts the magnetic field to generate an induced current, thus achieving the purpose of power generation. The generated electrical energy flows into the third battery pack BT3 for storage, thus forming a charge-discharge cycle. This achieves self-powering without a transformer, and the structure is simple with low operation and maintenance costs.

[0049] like Figure 1As shown, in one embodiment of this utility model, an oil supply pump 2M for supplying oil to the gas turbine is also included. The oil supply pump 2M is connected to another AC power output terminal of the inverter VC1. The 220V AC power required by the oil supply pump 2M and the computer PC is supplied by the inverter VC1. An uninterruptible power supply (UPS) for voltage stabilization and filtering is also connected to the computer PC. It is connected to the circuit through socket XS03 to effectively protect the computer PC. The AC power after being inverted by the inverter VC1 flows into the UPS through socket XS03, and after being stabilized by the UPS, it flows into the computer PC, improving the stability and reliability of the system operation.

[0050] The state switching circuit 3 includes a fourth relay KA2, a fifth relay KA3, and a sixth relay KM3, such as Figure 1 As shown, the normally open contact of the fourth relay KA2 is located on the branch between the DC motor constant current source HL1 and the excitation coil 5. The fourth relay KA2 controls the current flow in the excitation coil 5. The normally open contact of the sixth relay KM3 is located on the branch between the input terminal of the oil pump 2M and the AC output terminal of the inverter VC1. The control circuit coil of the sixth relay KM3 is connected in parallel with the oil pump 2M and in series with the normally open contact of the fifth relay KA3. The power supply of the fifth relay KA3 controls the power supply of the sixth relay KM3.

[0051] The fourth relay KA2 and the fifth relay KA3 are also controlled by the control signals output by the upper control system 4. When the DC motor 1M is used as a starter, the normally open contacts of the fourth relay KA2 and the fifth relay KA3 are in the open state. When the DC motor 1M is used as a generator, the normally open contact of the fourth relay KA2 closes after receiving the electrical signal from the upper control system 4. The current from the DC motor constant current source HL1 flows into the excitation coil 5 to provide it with excitation current. The excitation coil 5 on the rotor of the DC motor 1M is energized to form a magnetic field. The rotor of the DC motor 1M continuously cuts the magnetic lines of force, generating an induced current according to Faraday's law of electromagnetic induction, which then flows into the third battery pack BT3 for storage.

[0052] The electrical energy in the third battery pack BT3 is converted into AC power by the inverter VC1 and supplied to the DC motor constant current source HL1 and the oil pump connected to its AC output terminal. After receiving the electrical signal from the upper control system 4, the fifth relay KA3 closes its normally open contact, energizing the coil of the sixth relay KM3 connected in series with it. Then its normally open contact closes, energizing the oil pump 2M and starting to supply oil to the gas turbine, forming a cycle. The switching between circuits is formed according to the working state of the DC motor 1M.

[0053] The state switching circuit 3 also includes a circuit breaker, such as Figure 1As shown, a first circuit breaker Q1 is installed between the input terminal of the DC motor 1M and the positive terminal of the third battery pack BT3; a second circuit breaker Q2 is installed between the input terminal of the oil pump 2M and the AC power output terminal of the inverter VC1; a third circuit breaker Q3 is installed between the input terminal of the DC motor constant current source HL1 and the AC power output terminal of the inverter VC1; and a fourth circuit breaker Q4 is installed between the DC power input terminal of the inverter VC1 and the output terminal of the third battery pack BT3.

[0054] like Figure 1 As shown in one embodiment of this utility model, to prevent short circuits, overloads, undervoltage, and damage to various electronic components, circuit breakers can be installed as needed on the connection channels of each discharge circuit, charging circuit, and various electronic components (such as: computer PC, upper control system 4, oil pump 2M, DC motor 1M, and inverter VC1, etc.) to ensure the stable operation of the self-powered system of DC motor 1M of the medium-voltage gas turbine emergency power vehicle. Specifically, the first circuit breaker Q1 is installed on the charging circuit between DC motor 1M and the third battery pack BT3; the second circuit breaker Q2 is installed on the circuit between inverter VC1 and oil pump 2M; the third circuit breaker Q3 is installed on the circuit between DC motor constant current source HL1 and inverter VC1; the fourth circuit breaker Q4 is installed on the circuit between the third battery pack BT3 and inverter VC1; and the fifth circuit breaker Q5 is installed on the circuit between inverter VC1 and computer PC.

[0055] This utility model discloses a 1M DC motor self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle. The working process is as follows:

[0056] 1. Starting process when DC motor 1M is used as a starter

[0057] (1) The first battery pack BT1 and the second battery pack BT2 are connected in parallel to provide 24V starting power to the starter box QDX1, which powers the DC motor 1M. After the DC motor 1M is powered, it rotates, thereby driving the gas turbine meshing with its gear to rotate, thus achieving the purpose of starting the high-pressure gas turbine.

[0058] (2) After 15 seconds of power supply, the upper control system 4 controls the first relay KA1 to be energized, and then the coils of the third relay KM2 and the second relay KM1 are energized.

[0059] (3) The first battery pack BT1 and the second battery pack BT2 are connected in series after the contacts of the third relay KM2 and the second relay KM1 are engaged, providing 48V starting power to the starter box QDX1 to power the DC motor 1M. After the voltage of the DC motor 1M increases, its speed increases and its output power increases, thereby driving the gas turbine to rotate faster.

[0060] (4) When the speed of the gas turbine driven by the DC motor 1M reaches 48%, the upper control system 4 controls the coil of the first relay KA1 to be de-energized, the first battery pack BT1 and the second battery pack BT2 are connected in parallel, and the starter box QDX1 stops supplying power to the DC motor 1M. At this time, the gas turbine has started under the drive of the DC motor 1M, and the speed gradually increases until it reaches 100%.

[0061] 2. The power generation process when the DC motor 1M is used as a generator.

[0062] (1) When the gas turbine speed reaches 100%, it continues to drive the DC motor 1M to rotate through the transmission system, thus realizing the gas turbine driving the DC motor 1M to rotate.

[0063] (2) At this time, the upper control system 4 controls the fourth relay KA2 coil to be energized, and the constant current source HL1 provides about 4A of excitation current to the DC motor 1M, and provides a stable excitation current to the excitation coil 5 in the DC motor 1M.

[0064] (3) After the excitation coil 5 in the DC motor 1M obtains the excitation current, it generates a magnetic field. According to Faraday's electromagnetic induction principle, the rotor of the DC motor 1M cuts the magnetic field, thereby generating DC power and sending it to the third battery pack BT3 through the circuit breaker Q1 on the charging circuit. The DC motor 1M is driven to rotate by the gas turbine to achieve the purpose of generating electricity.

[0065] (4) The third battery pack BT3 in the second discharge circuit flows into the inverter VC1 through the circuit breaker Q5. The inverter VC1 converts the DC power into AC220V AC power to provide AC220V AC power to the AC electronic components, thereby achieving the purpose of self-powering of the medium-pressure gas turbine emergency power vehicle.

[0066] It should be noted that the terms "center", "upper", "lower", "front", "rear", "left", "right", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0067] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0068] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A self-powered system for a medium-pressure gas turbine-type emergency power supply vehicle, characterized in that: It includes a DC motor starting device, used to provide controlled operating power to the DC motor when it is in motoring mode, so as to drive the gas turbine to run; A constant current source for DC motors is used to provide excitation power to DC motors when they are operating in generator mode. A charging and discharging device is used to store the electrical energy converted by the gas turbine through the DC motor during power generation and to control the DC-AC conversion to generate AC output. A state switching circuit is used to switch the enable between circuits according to the operating state of the DC motor. A DC motor is used to drive a gas turbine in electric mode, enabling it to start and reach its rated speed; in generator mode, it generates an induced current by creating a magnetic field under the drive of the gas turbine.

2. The self-powered system for a medium-pressure gas turbine-type emergency power vehicle according to claim 1, characterized in that: The DC motor starting device includes a first battery pack, a second battery pack, and a starter box. The positive terminal of the first battery pack is connected to the input terminal of the starter box, the output terminal of the starter box is connected to the positive input terminal of the DC motor power supply, the negative input terminal of the DC motor power supply is connected to the negative terminal of the first battery pack to form a circuit, and the second battery pack is connected in parallel with the first battery pack.

3. The self-powered system for a medium-pressure gas turbine-type emergency power vehicle according to claim 2, characterized in that: The DC motor starting device further includes a first relay, a second relay, and a third relay. The first relay is a single-pole single-throw relay, and the second and third relays are both single-pole double-throw relays. The control circuits of the second and third relays are connected in parallel and in series with the normally open contact of the first relay. The second and third relays are respectively set in the parallel circuit between the positive and negative terminals of the first and second battery packs. A series branch is set between the negative terminal of the first battery pack and the positive terminal of the second battery pack, and the normally open contacts of the second and third relays are set in the series branch.

4. The self-powered power supply system for a medium-pressure gas turbine-type emergency power vehicle according to claim 1, characterized in that: The charging and discharging device includes a third battery pack and an inverter. The first positive terminal of the third battery pack is connected to the positive input terminal of the DC motor power supply, and the first negative terminal is connected to the negative input terminal of the DC motor power supply. The second positive terminal of the third battery pack is connected to the positive terminal of the DC power input terminal of the inverter, and the second negative terminal is connected to the negative terminal of the DC power input terminal of the inverter.

5. The self-powered system for a medium-pressure gas turbine-type emergency power vehicle according to claim 4, characterized in that: The constant current source input terminal of the DC motor is connected to an AC power output terminal of the inverter, and the output terminal is connected to the excitation coil of the DC motor.

6. The self-powered system for a medium-pressure gas turbine-type emergency power vehicle according to claim 5, characterized in that: Another AC output terminal of the inverter is connected to an oil supply pump.

7. The self-powered system for a medium-pressure gas turbine-type emergency power vehicle according to claim 6, characterized in that: The state switching circuit includes a fourth relay, a fifth relay, and a sixth relay. The normally open contact of the fourth relay is located on the branch between the DC motor constant current source and the excitation coil. The normally open contact of the sixth relay is located on the branch between the oil pump input terminal and the inverter AC output terminal. The control circuit coil of the sixth relay is connected in parallel with the oil pump and in series with the normally open contact of the fifth relay.

8. The self-powered system for a medium-pressure gas turbine-type emergency power vehicle according to claim 7, characterized in that: The state switching circuit also includes circuit breakers. A first circuit breaker is provided between the positive input terminal of the DC motor power supply and the positive terminal of the third battery pack. A second circuit breaker is provided between the input terminal of the oil pump and the AC power output terminal of the inverter. A third circuit breaker is provided between the input terminal of the DC motor constant current source and the AC power output terminal of the inverter. A fourth circuit breaker is provided between the DC power input terminal of the inverter and the output terminal of the third battery pack.

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