Uninterruptible power supply system of magnetic suspension expansion generator

Abstract

The utility model discloses an uninterruptible power supply system of a magnetic suspension expansion generator, which belongs to the technical field of waste heat power generation and comprises a DC / DC converter, an AC / DC converter, a solid-state relay K1, a solid-state relay K2 and a driving interlocking circuit. Wherein the DC / DC converter is used for stabilizing an input voltage and supplying power to the magnetic suspension expansion generator controller; the AC / DC converter is used for rectifying the alternating current of the power grid and outputting the rectified alternating current to the DC / DC converter; one end of the solid-state relay is electrically connected with the converter input end, and the other end is connected with the power supply input end; and the driving interlocking circuit is used for controlling the turn-off of the solid-state relay to realize the selection of a power supply of the uninterruptible power supply system. According to the utility model, the uninterruptible power supply can be provided for the controller of the magnetic suspension expansion generator in the low-temperature waste heat power generation system.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat power generation technology, and more specifically, relates to an uninterruptible power supply system for a magnetic levitation expansion generator. Background Technology

[0002] Magnetic levitation expander generators, as highly efficient devices for generating electricity using low-temperature waste heat, have been increasingly adopted in the industrial field in recent years. Magnetic levitation expander generators offer advantages such as high efficiency, low loss, and long lifespan. Their core components are a high-speed motor and magnetic levitation bearings. Because the system contains enormous kinetic energy, ensuring the stable operation of the generator control system under all conditions is crucial.

[0003] However, existing magnetic levitation expander generator control systems typically rely on an external power grid for control power. When the grid fails or experiences a power outage, the controller may lose continuous power, causing the generator rotor to lose control and fall, potentially resulting in equipment damage and system shutdown. This is a significant drawback of current technology. To address this issue, a reliable uninterruptible power supply (UPS) system is needed to ensure the controller is independent of the power grid, guaranteeing normal operation of the generator even in the event of grid failure. Utility Model Content

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, this utility model provides an uninterruptible power supply system for a magnetic levitation expansion generator, thereby solving the technical problem that when the grid fails or power outage occurs, the controller of the existing magnetic levitation expansion generator cannot obtain continuous power, resulting in the loss of control of the generator rotor.

[0005] To achieve the above objectives, according to one aspect of the present invention, an uninterruptible power supply system for a magnetic levitation expansion generator is provided. The magnetic levitation expansion generator is used in a low-temperature waste heat power generation system and includes a DC / DC converter, an AC / DC converter, a first relay, a second relay, and a drive interlock circuit.

[0006] The output of the DC / DC converter is connected to the magnetic levitation expansion generator controller, the input of the DC / DC converter is connected to one end of the second relay, and the other end of the second relay is connected to the DC voltage port obtained after the AC output of the generator is rectified.

[0007] The output terminal of the AC / DC converter is connected to the input terminal of the DC / DC converter, the input terminal of the AC / DC converter is connected to one end of the first relay, and the other end of the first relay is connected to the power grid port;

[0008] The drive interlock circuit is used to control the closing and closing of the first and second relays, thereby enabling the selection of the power supply for the intermittent power supply system.

[0009] Preferably, the input terminal of the drive interlock circuit is connected to the output terminal of the magnetic levitation expansion generator controller, and the output terminal of the drive interlock circuit is connected to the first relay and the second relay respectively.

[0010] Preferably, the first relay is a solid-state relay K1.

[0011] Preferably, the second relay is a solid-state relay K2.

[0012] Preferably, when the magnetic levitation expansion generator is in the start-up state, the drive interlock circuit is used to control the solid-state relay K1 to close and the solid-state relay K2 to close; the AC / DC converter is used to rectify the AC power of the power grid and output DC power to the DC / DC converter, and at this time the magnetic levitation expansion generator controller is powered by the power grid.

[0013] Preferably, when the magnetic levitation expansion generator starts normally and is in a stable operating state, the drive interlock circuit is used to receive the control signal from the magnetic levitation expansion generator controller and control the solid-state relay K2 to close and the solid-state relay K1 to close. The DC / DC converter is used to rectify the AC power output by the generator to obtain DC power and input it to the magnetic levitation expansion generator controller. At this time, the magnetic levitation expansion generator controller is powered by the generator itself and does not rely on the power grid.

[0014] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects:

[0015] The uninterruptible power supply system for the magnetic levitation expansion generator proposed in this invention can provide uninterrupted power to the controller of the magnetic levitation expansion generator in the low-temperature waste heat power generation system.

[0016] (1) Start-up phase: When the magnetic levitation expansion generator starts for the first time, the system relies on the power provided by the external power grid to drive the DC / DC converter for voltage regulation and to supply power to the controller. At this time, the solid-state relay is connected to the power grid port under the control of the drive interlock circuit to ensure that the controller receives power from the power grid. During the system startup process, the drive interlock circuit monitors the operating status of the generator to ensure that the system switches to generator power supply mode only after the generator starts outputting power.

[0017] (2) Stable Operation Phase: Once the magnetic levitation expander generator enters the stable operation phase, the generator has stably output AC power and obtained DC power through rectification, supplying the DC / DC converter as a stable input power source. During this process, the controller is still provided with regulated power by the DC / DC converter and no longer relies on grid power. At this time, the solid-state relay will automatically switch to connect to the DC power output of the generator, ensuring that the system is completely powered by the generator itself, thereby achieving completely independent power supply for the controller.

[0018] (3) Power Grid Fault Handling and Recovery Phase: If a power grid fault or outage occurs, the drive interlock circuit will automatically determine the current power grid status and make adjustments. If the power grid cannot restore power supply, the system will continue to be powered by the generator to ensure the normal operation of the controller. Meanwhile, if the generator is in normal operating condition, the rotor maintains high-speed rotation, and the system can continue to operate independently of the power grid even if power supply is restored. If the power grid returns to normal operation, the drive interlock circuit will switch the solid-state relay back to the power grid power supply mode based on the signal from the controller. At this time, the power grid is reconnected, the generator controller is powered by the power grid, and normal operation resumes.

[0019] (4) Emergency handling and safe switching: When the generator stops or runs at low speed, the drive interlock circuit will ensure that the solid-state relay is reconnected to the grid port. Since the generator output voltage is low when running at low speed, the controller will switch to grid power supply mode through the solid-state relay, thereby avoiding the normal operation of the controller due to unstable or insufficient power output from the generator. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the uninterruptible power supply system for a magnetic levitation expander generator.

[0021] In all the figures, the same reference numerals are used to denote the same elements or structures, wherein: C1 - DC / DC converter; C2 - AC / DC converter; C3 - drive interlock circuit. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] like Figure 1 As shown, the magnetic levitation expansion generator in this embodiment of the invention is used in a low-temperature waste heat power generation system, which includes:

[0024] DC / DC converter C1, AC / DC converter C2, solid-state relay K1, solid-state relay K2, and drive interlock circuit C3;

[0025] The DC / DC converter C1 is used to regulate the input voltage and supply power to the magnetic levitation expansion generator controller; the AC / DC converter C2 is used to rectify the AC power from the power grid and output it to the DC / DC converter C1; the drive interlock circuit C3 is used to control the closing and closing of solid-state relays K1 and K2, so as to realize the selection of the power supply for the uninterruptible power supply system.

[0026] Specifically, one end of the solid-state relay K1 is electrically connected to the input terminal of the AC / DC converter C2, and the other end is electrically connected to the power grid port; one end of the solid-state relay K2 is electrically connected to the input terminal of the DC / DC converter C2, and the other end is electrically connected to the DC voltage port obtained after rectification of the AC output power from the generator.

[0027] When the magnetic levitation expander generator starts for the first time, the system relies on power from the external power grid to drive the DC / DC converter C1, which regulates the voltage and supplies power to the controller. At this time, a solid-state relay is connected to the power grid port via a drive interlock circuit to ensure the controller receives power from the grid. During system startup, the drive interlock circuit monitors the generator's operating status, ensuring that once the generator begins outputting power, the system switches to generator-powered mode.

[0028] Once the magnetic levitation expander generator enters a stable operating phase, it stably outputs AC power and obtains DC power through rectification, supplying the DC / DC converter C1 as a stable input power source. During this process, the controller continues to be supplied with regulated power by the DC / DC converter C1, no longer relying on grid power. At this time, the solid-state relay automatically switches to connect to the DC power output of the generator, ensuring that the system is entirely powered by the generator itself, thereby achieving completely independent power supply for the controller.

[0029] If a power grid failure or outage occurs, the drive interlock circuit will automatically determine the current power grid status and make adjustments. If the power grid cannot restore power, the system will continue to be powered by the generator to ensure the normal operation of the controller. Meanwhile, if the generator is operating normally, the rotor maintains high-speed rotation, allowing the system to continue operating independently of the power grid even after power is restored.

[0030] If the power grid resumes normal operation, the drive interlock circuit will switch the solid-state relay back to grid power supply mode based on the signal from the controller. At this time, the power grid is reconnected, the generator controller is powered by the grid, and normal operation resumes.

[0031] When the generator stops or operates at low speed, the drive interlock circuit ensures that the solid-state relay is reconnected to the grid port. Because the generator's output voltage is low during low-speed operation, the controller switches to grid power supply mode via the solid-state relay, thus preventing the controller's normal operation from being affected by unstable or insufficient power output from the generator.

[0032] Before the magnetic levitation expander generator stops operating, the rotor is rotating at a low speed. The controller of the magnetic levitation expander generator controls the drive interlock circuit of the uninterruptible power supply system, closes the solid-state relay that is electrically connected to the power grid, and closes the solid-state relay that is electrically connected to the DC voltage terminal obtained after rectification of the generator's output AC power. If the power grid is still in a fault state at this time, the controller stops working. The rotor falling at low speed will not cause great damage. After the power grid restores normal power supply, the entire generator system can still be started through the power grid.

[0033] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An uninterruptible power supply system for a magnetically levitated expander generator, wherein the magnetically levitated expander generator is used in a low-temperature waste heat power generation system, characterized in that, It includes a DC / DC converter (C1), an AC / DC converter (C2), a first relay, a second relay, and a drive interlock circuit (C3); The output of the DC / DC converter (C1) is connected to the magnetic levitation expansion generator controller, and the input of the DC / DC converter (C1) is connected to one end of the second relay. The other end of the second relay is connected to the DC voltage port obtained after the AC output of the generator is rectified. The output terminal of the AC / DC converter (C2) is connected to the input terminal of the DC / DC converter (C1), the input terminal of the AC / DC converter (C2) is connected to one end of the first relay, and the other end of the first relay is connected to the power grid port. The drive interlock circuit (C3) is used to control the closing and closing of the first and second relays, thereby enabling the selection of the power supply for the intermittent power supply system.

2. The uninterruptible power supply system for a magnetic levitation expansion generator according to claim 1, characterized in that, The input terminal of the drive interlock circuit (C3) is connected to the output terminal of the magnetic levitation expansion generator controller, and the output terminal of the drive interlock circuit (C3) is connected to the first relay and the second relay respectively.

3. The uninterruptible power supply system for a magnetic levitation expansion generator according to claim 2, characterized in that, The first relay is a solid-state relay K1.

4. The uninterruptible power supply system for a magnetic levitation expansion generator according to claim 3, characterized in that, The second relay is a solid-state relay K2.

5. The uninterruptible power supply system for a magnetic levitation expansion generator according to claim 4, characterized in that, When the magnetic levitation expansion generator is in the start-up state, the drive interlock circuit (C3) is used to control the solid-state relay K1 to close and the solid-state relay K2 to close; the AC / DC converter (C2) is used to rectify the AC power of the grid and output DC power to the DC / DC converter (C1). At this time, the magnetic levitation expansion generator controller is powered by the grid.

6. The uninterruptible power supply system for a magnetic levitation expansion generator according to claim 5, characterized in that, When the magnetic levitation expansion generator starts normally and is in a stable operating state, the drive interlock circuit (C3) is used to receive the control signal from the magnetic levitation expansion generator controller and control the solid-state relay K2 to close and the solid-state relay K1 to close. The DC / DC converter (C1) is used to rectify the AC power output of the generator to obtain DC power and input it to the magnetic levitation expansion generator controller. At this time, the magnetic levitation expansion generator controller is powered by the generator itself and does not rely on the power grid.

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