Double fault-tolerant uninterruptible protection power supply system for magnetic suspension system

Abstract

The invention discloses a double-fault-tolerant uninterruptible protection power supply system for a magnetic suspension system, and the system comprises a rectification module which has an input end connected with an AC commercial power supply end and is used for converting an AC power into a DC power; the direct current power generation assembly is used for providing direct current after the alternating current mains supply loses power; the input end of the first DC / DC module is connected with the output ends of the rectification module and the direct-current power generation assembly, the output end of the first DC / DC module is connected with the magnetic suspension system, and the first DC / DC module is used for increasing or decreasing the voltage of the direct current to the direct-current power supply voltage required by the magnetic suspension system; the input end of the charging and discharging assembly is connected with the output ends of the rectifying module and the direct-current power generation assembly or the output end of the first DC / DC module, the output end of the charging and discharging assembly is connected with the magnetic suspension system, and the charging and discharging assembly is used for charging by utilizing the rectified direct current or the direct current provided by the direct-current power generation assembly and supplying power to the magnetic suspension system after the alternating-current mains supply and the direct-current power generation assembly lose power. Dual power supply guarantee can be provided for the magnetic suspension system, and the normal working state of the magnetic suspension system is maintained.

Description

Technical Field

[0001] The invention relates to an uninterruptible protection power supply system of a double fault-tolerant magnetic suspension system, belonging to the technical field of magnetic suspension. Background Art

[0002] The magnetic levitation high-speed motor relies on the magnetic levitation bearing controller to achieve stable and reliable suspension of the rotor in the center of the mechanical space. Since the magnetic levitation controller is an electronic device, if there is a sudden power failure during the operation of the equipment, the magnetic levitation controller will immediately stop the suspension control, which will cause the high-speed shaft to no longer be suspended and fall on the stator component of the equipment, causing serious damage to the equipment. At the same time, after the power failure occurs, the control system of the entire unit equipment needs to record the fault information or report the fault, and also hopes to maintain power supply during this process.

[0003] To address this problem, in situations where a four-quadrant inverter is available, the inverter is often used to generate electricity to maintain system power supply. That is, a DC / DC power supply is designed, and its input is connected to the DC bus of the inverter. When a power failure occurs, the inverter switches to power generation mode, feeding the kinetic energy of the high-speed rotating shaft to the DC bus to maintain the normal operation of the DC / DC, and then outputting power to the subsequent magnetic levitation controller.

[0004] However, the above solution still has the following problems, that is, if the inverter fails to short-circuit, the DC / DC power supply will immediately lose power supply, and the subsequent system will directly fail seriously, thus adding additional potential faults. At the same time, if there is no inverter in some magnetic levitation system occasions, the inverter does not have the function of switching power generation, and this solution will no longer be feasible. Summary of the invention

[0005] The purpose of the present invention is to provide a dual fault-tolerant uninterruptible protection power supply system for a magnetic suspension system, which can provide dual protection in the event of a sudden power failure of an external mains power supply and maintain the normal working state of the magnetic suspension system.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A dual fault-tolerant magnetic suspension system uninterruptible protection power supply system, comprising:

[0008] The rectifier module, whose input end is connected to the AC mains power supply end, is used to convert AC power into DC power to supply power to the magnetic levitation system;

[0009] A DC power generation component is used to provide DC power to the magnetic levitation system after the AC mains fails;

[0010] A first DC / DC module, whose input end is connected to the rectifier module and the output end of the DC power generation component, and whose output end is connected to the magnetic suspension system, is used to increase or decrease the voltage of the DC power to the DC power supply voltage required by the magnetic suspension system;

[0011] The charging and discharging component has an input end connected to the output end of the rectifier module, the DC power generation component or the output end of the first DC / DC module, and an output end connected to the magnetic levitation system. It is used to charge with the DC power rectified by the rectifier module or the DC power provided by the DC power generation component, and provide DC power to power the magnetic levitation system after the AC mains and the DC power generation component lose power.

[0012] Preferably, the DC power generation component comprises:

[0013] an alternator for providing alternating current;

[0014] The inverter has an input end connected to the output end of the AC generator and an output end connected to the input end of the first DC / DC module, and is used to convert the AC power provided by the AC generator into DC power to power the magnetic levitation system.

[0015] Preferably, the charging and discharging assembly comprises:

[0016] The energy storage module is used to charge the DC power rectified by the rectifier module or the DC power provided by the DC power generation component, and provide DC power to the magnetic suspension system after the AC mains or the DC power generation component loses power;

[0017] The second DC / DC module has an input end connected to the output end of the rectifier module, the DC power generation component or the output end of the first DC / DC module, and an output end connected to the input end of the energy storage module, and is used to increase or decrease the voltage of the DC power rectified by the rectifier module and the DC power provided by the DC power generation component to the DC charging voltage required by the energy storage module, or to increase or decrease the voltage of the DC power after being stepped up or down by the first DC / DC module to the DC charging voltage required by the energy storage module again;

[0018] The third DC / DC module has an input end connected to the output end of the energy storage module and an output end connected to the magnetic suspension system, and is used to increase or decrease the discharge voltage of the energy storage module to the DC power supply voltage required by the magnetic suspension system.

[0019] The beneficial effects of the present invention are:

[0020] The maglev system is powered by DC power generation components and charging and discharging components to provide dual fault tolerance protection. In the event of a sudden power failure of the external mains, the DC power generation components or the charging and discharging components can still power the maglev system. Even in the case of a maglev system without a DC power generation component, in the event of a sudden power failure of the external mains, the charging and discharging components can also power the maglev system, thus avoiding more serious suspension failures caused by short-circuit failures of the DC power generation components and improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The power supply system of the magnetic suspension system corresponding to Example 1;

[0022] Figure 2 This is the power supply system of the magnetic levitation system corresponding to Example 2.

[0023] The main reference numerals in the figure have the following meanings:

[0024] 1. Rectifier module, 2. AC generator, 3. Inverter, 4. First DC / DC module, 5. Second DC / DC module, 6. Energy storage module, 7. Third DC / DC module. DETAILED DESCRIPTION

[0025] Example 1

[0026] This embodiment provides a dual fault-tolerant magnetic suspension system uninterruptible protection power supply system, such as Figure 1 As shown, it includes a rectifier module, an AC generator, an inverter, a first DC / DC module, a second DC / DC module, an energy storage module and a third DC / DC module.

[0027] Among them, the input end of the rectifier module is connected to the AC mains power supply end, and the output end is connected to the first DC / DC module. The AC mains power is converted into DC power after passing through the rectifier module. After the DC power passes through the first DC / DC module, the voltage rises or drops to the DC power supply voltage required by the magnetic levitation system, thereby realizing power supply to the magnetic levitation system, that is, Figure 1 Middle 1# power supply line.

[0028] At the same time, in order to prevent the magnetic levitation system from malfunctioning due to a sudden power failure of the mains, a DC power generation component is introduced in this embodiment. The DC power generation component includes the above-mentioned AC generator and inverter.

[0029] Specifically, the output end of the AC generator is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the first DC / DC module. After the mains power is lost, the AC power generated by the AC generator is converted into DC power through the inverter, and then after passing through the first DC / DC module, the voltage is increased or decreased to the DC power supply voltage required by the magnetic levitation system, thereby realizing power supply to the magnetic levitation system, that is, Figure 12# power supply line in.

[0030] In order to further improve the system reliability, or to meet the system reliability requirements in some situations where there are no DC power generation components, a charging and discharging component is further introduced in this embodiment. The charging and discharging component can be charged using the DC power rectified by the rectifier module or the DC power provided by the DC power generation component, and provide DC power to power the magnetic levitation system after the AC mains and the DC power generation component lose power.

[0031] Specifically, the charge and discharge assembly includes the above-mentioned energy storage module, the second DC / DC module and the third DC / DC module. Among them, the energy storage module can be a battery or capacitor module that can be repeatedly charged and discharged, such as a lithium battery, a lead-acid battery, etc. The input end of the second DC / DC module is connected to the output end of the first DC / DC module, and the output end of the second DC / DC module is connected to the input end of the energy storage module; the output end of the energy storage module is connected to the input end of the third DC / DC module, and the output end of the third DC / DC module is connected to the magnetic suspension system.

[0032] When the AC mains is supplying power normally (including situations where there is no DC power generation component) or when the AC mains fails and the DC power generation component supplies power, the voltage of the DC power rectified by the rectifier module of the AC mains or the voltage of the DC power provided by the DC power generation component is boosted or reduced by the first DC / DC module, and then boosted or reduced by the second DC / DC module to the DC charging voltage required by the energy storage module to charge the energy storage module.

[0033] When the AC mains fails and there is no DC power generation component, or when both the AC mains and the DC power generation component fail, the electricity stored in the energy storage module will be discharged, and the discharge voltage will be raised or lowered to the DC power supply voltage required by the magnetic levitation system through the third DC / DC module to supply power to the magnetic levitation system. Figure 1 Middle 3# power supply line.

[0034] Example 2

[0035] This embodiment provides a dual fault-tolerant magnetic suspension system uninterruptible protection power supply system, such as Figure 2 As shown, it includes a rectifier module, an AC generator, an inverter, a first DC / DC module, an energy storage module, a second DC / DC module and a third DC / DC module.

[0036] Among them, the input end of the rectifier module is connected to the AC mains power supply end, and the output end is connected to the first DC / DC module. The AC mains power is converted into DC power after passing through the rectifier module. After the DC power passes through the first DC / DC module, the voltage rises or drops to the DC power supply voltage required by the magnetic levitation system, thereby realizing power supply to the magnetic levitation system, that is, Figure 2 Middle 1# power supply line.

[0037] At the same time, in order to prevent the magnetic levitation system from malfunctioning due to a sudden power failure of the mains, a DC power generation component is introduced in this embodiment. The DC power generation component includes the above-mentioned AC generator and inverter.

[0038] Specifically, the output end of the AC generator is connected to the input end of the inverter, and the output end of the inverter is connected to the input end of the first DC / DC module. After the mains power is lost, the AC power generated by the AC generator is converted into DC power through the inverter, and then after passing through the first DC / DC module, the voltage is increased or decreased to the DC power supply voltage required by the magnetic levitation system, thereby realizing power supply to the magnetic levitation system, that is, Figure 2 2# power supply line in.

[0039] In order to further improve the system reliability, or to meet the system reliability requirements in some situations where there are no DC power generation components, a charging and discharging component is further introduced in this embodiment. The charging and discharging component can be charged using the DC power rectified by the rectifier module or the DC power provided by the DC power generation component, and provide DC power to power the magnetic levitation system after the AC mains and the DC power generation component lose power.

[0040] Specifically, the charge and discharge assembly includes the above-mentioned energy storage module, the second DC / DC module and the third DC / DC module. Among them, the energy storage module can be a battery or capacitor module that can be repeatedly charged and discharged, such as a lithium battery, a lead-acid battery, etc. The input end of the second DC / DC module is connected to the output end of the rectifier module and the DC power generation assembly, and the output end of the second DC / DC module is connected to the input end of the energy storage module; the output end of the energy storage module is connected to the input end of the third DC / DC module, and the output end of the third DC / DC module is connected to the magnetic suspension system.

[0041] When the AC mains is supplying power normally (including situations where there is no DC power generation component) or when the AC mains fails and the DC power generation component is supplying power, the voltage of the DC power rectified by the rectifier module from the AC mains or the voltage of the DC power provided by the DC power generation component is directly stepped up or down through the second DC / DC module to the DC charging voltage required by the energy storage module to charge the energy storage module.

[0042] When the AC mains fails and there is no DC power generation component, or when both the AC mains and the DC power generation component fail, the electricity stored in the energy storage module will be discharged, and the discharge voltage will be raised or lowered to the DC power supply voltage required by the magnetic levitation system through the third DC / DC module to supply power to the magnetic levitation system. Figure 2 Middle 3# power supply line.

[0043] In the above embodiments, the switching between power supply and power failure among AC mains, DC power generation components and energy storage modules is already a prior art and will not be described in detail here.

[0044] The above is only a preferred implementation of the patent of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the patent of the present invention. These improvements and modifications should also be regarded as the scope of protection of the patent of the present invention.

Claims

1. A dual fault-tolerant magnetic suspension system uninterruptible protection power supply system, characterized in that: include: The rectifier module, whose input end is connected to the AC mains power supply end, is used to convert AC power into DC power to supply power to the magnetic levitation system; A DC power generation component is used to provide DC power to the magnetic levitation system after the AC mains fails; A first DC / DC module, whose input end is connected to the rectifier module and the output end of the DC power generation component, and whose output end is connected to the magnetic suspension system, is used to increase or decrease the voltage of the DC power to the DC power supply voltage required by the magnetic suspension system; The charging and discharging component has an input end connected to the output end of the rectifier module, the DC power generation component or the output end of the first DC / DC module, and an output end connected to the magnetic levitation system. It is used to charge with the DC power rectified by the rectifier module or the DC power provided by the DC power generation component, and provide DC power to power the magnetic levitation system after the AC mains and the DC power generation component lose power.

2. The dual fault-tolerant magnetic suspension system uninterruptible power supply system according to claim 1 is characterized in that: DC power generation components include: an alternator for providing alternating current; The inverter has an input end connected to the output end of the AC generator and an output end connected to the input end of the first DC / DC module, and is used to convert the AC power provided by the AC generator into DC power to power the magnetic levitation system.

3. The dual fault-tolerant magnetic suspension system uninterruptible power supply system according to claim 1 is characterized in that: The charging and discharging components include: The energy storage module is used to charge the DC power rectified by the rectifier module or the DC power provided by the DC power generation component, and provide DC power to the magnetic suspension system after the AC mains or the DC power generation component loses power; The second DC / DC module has an input end connected to the output end of the rectifier module, the DC power generation component or the output end of the first DC / DC module, and an output end connected to the input end of the energy storage module, and is used to increase or decrease the voltage of the DC power rectified by the rectifier module or the DC power provided by the DC power generation component to the DC charging voltage required by the energy storage module; or to increase or decrease the voltage of the DC power after being stepped up or down by the first DC / DC module to the DC charging voltage required by the energy storage module again; The third DC / DC module has an input end connected to the output end of the energy storage module and an output end connected to the magnetic suspension system, and is used to increase or decrease the discharge voltage of the energy storage module to the DC power supply voltage required by the magnetic suspension system.

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