CN218876912U - Suspension control power supply circuit based on hydrogen fuel cell - Google Patents
Suspension control power supply circuit based on hydrogen fuel cell Download PDFInfo
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- CN218876912U CN218876912U CN202320173008.2U CN202320173008U CN218876912U CN 218876912 U CN218876912 U CN 218876912U CN 202320173008 U CN202320173008 U CN 202320173008U CN 218876912 U CN218876912 U CN 218876912U
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Abstract
The invention discloses a suspension control power supply circuit based on a hydrogen fuel cell. When the suspension system is in a rated working condition, the hydrogen fuel cell module is switched to a constant power mode, the working state of the hydrogen fuel cell module is selected according to the capacity condition of the energy storage module, when the working state is switched, the timer circuit is reset to start timing so as to obtain the corresponding working state duration, and the working state duration and the corresponding output voltage change value are controlled to ensure that the power supply voltage for the suspension system is in a voltage stabilization state. In addition, the working state of the hydrogen fuel cell is selected according to the capacity of the energy storage module, and the frequent switching state of the energy storage module and the hydrogen fuel cell module caused by suspension control fluctuation is avoided. Under the peak working condition, the energy storage module is switched to a discharge state to adapt to the suspension system in real time, and the defect of slow dynamic response of the hydrogen fuel cell is overcome.
Description
Technical Field
The application relates to the technical field of suspension control, in particular to a suspension control power supply circuit based on a hydrogen fuel cell.
Background
In order to realize the real ground-attached flight of the maglev train, reduce the line resistance brought by the contact between the current-receiving boots and the contact rails, reduce the line construction cost, and put an end to the potential safety hazard caused by the exposed contact rails, the medium-low speed maglev train needs to cancel the current-receiving rail power supply scheme and provides electric energy through vehicle-mounted energy storage or vehicle-mounted power generation.
When the fuel cell is applied to a magnetic suspension control system, because the output load is a suspension electromagnet and belongs to a typical inductive load, when the suspension controller performs closed-loop control on the electromagnet, the power fluctuation of the suspension controller is large due to the dynamic change of the load and the suspension gap, the difference between the input power of the suspension controller under a rated working condition and the input power of the suspension controller under a peak working condition is more than 6 times, and the fuel cell is a rated power supply system and needs to be configured according to the peak power of the fuel cell when being used in the field of the suspension controller, so that the utilization efficiency and the energy density ratio of the fuel cell are very low, the cost is high, and meanwhile, the system output dynamic response of the hydrogen fuel cell is very slow, and the requirement of the suspension control system for high current change rate cannot be met. The above related problems directly hinder the popularization and application of the hydrogen fuel cell in the suspension control field.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a hydrogen fuel cell-based levitation control power supply circuit to improve fuel cell utilization efficiency and accommodate a high variation rate of levitation control.
A hydrogen fuel cell based levitation control power supply circuit, the circuit comprising:
the device comprises a hydrogen fuel cell module, a voltage stabilizing unit, an energy storage module, a timer circuit and a suspension control module; the timer circuit is connected with the hydrogen fuel cell module;
the voltage stabilizing unit is connected with the hydrogen fuel cell module, the energy storage module and the suspension control module and is used for stabilizing an unstable direct current power supply output by the hydrogen fuel cell module so as to output the unstable direct current power supply to the suspension control module and/or the energy storage module;
when the suspension system is in a rated working condition, the hydrogen fuel cell module is switched to a constant power output mode, and the working state of the hydrogen fuel cell module is controlled and switched according to the capacity condition of the energy storage module; the working states comprise a first working state with the output power not less than the suspension power and a second working state with the output power less than the suspension power;
when the working state is switched, the timer circuit resets and starts to time to obtain the corresponding working state duration and the output voltage change value of the voltage stabilizing module in the working state duration, and the timer circuit is used for calculating the ratio of the suspension single-cycle control working time to the working state duration so that the product of the ratio and the output voltage change value is less than one ten thousandth of the suspension control working voltage;
when the suspension system is in a peak working condition, the hydrogen fuel cell module is switched to a current-limiting output mode, and the energy storage module is switched to a discharging state, so that the hydrogen fuel cell module and the energy storage module output voltage to the voltage stabilizing module to supply power to the suspension control module together.
The suspension control power supply circuit based on the hydrogen fuel cell is characterized in that an energy storage module is added, when a suspension system is in a rated working condition, the hydrogen fuel cell module is switched to a constant power output mode, the working state of the hydrogen fuel cell module is selected according to the capacity condition of the energy storage module, namely, the output power of the hydrogen fuel cell is controlled within a certain range, two working states, namely, the output power of the hydrogen fuel cell module is not less than or less than the suspension power, are selected according to the capacity of the energy storage module, when the working states are switched, a timer circuit is reset to start timing to obtain the corresponding working state duration time and the output voltage change value of a voltage stabilizing module within the working state duration time, and the ratio of the suspension single-cycle control working time to the working state duration time is calculated, so that the product of the ratio and the output voltage change value is less than one ten thousandth of the current suspension control working voltage. Because the capacity condition of the energy storage module is fully considered under the rated working condition, the working state of the hydrogen fuel cell module is switched, the output working voltage of the voltage stabilizing module fluctuates periodically within a certain time interval during actual working, and the duration time of the working state and the change value of the output voltage are well controlled to ensure that the input power supply voltage of the suspension system is in a stable working state. In addition, the working state of the hydrogen fuel cell is selected according to the capacity condition of the energy storage module, so that frequent switching of the charging and discharging states of the energy storage module and the frequent switching of the working state of the hydrogen fuel cell module caused by suspension control fluctuation are avoided, and the service life is prolonged. Under the peak working condition, because the rated power configured by the hydrogen fuel cell is smaller than the peak power of the suspension system in order to improve the utilization rate of the cell, the power requirement of the suspension system cannot be met by the hydrogen fuel cell module alone, and at the moment, the energy storage module can be switched to a discharge state to adapt to the suspension system with a high change rate in real time, so that the defect of slow dynamic output response of the hydrogen fuel cell is overcome.
Drawings
FIG. 1 is a block schematic diagram of a hydrogen fuel cell based levitation control power supply circuit;
fig. 2 is a schematic diagram of a hydrogen fuel cell based levitation control power supply circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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 application and are not intended to limit the present application.
As shown in fig. 1, there is provided a hydrogen fuel cell based levitation control power supply circuit, including:
the device comprises a hydrogen fuel cell module, a voltage stabilizing unit, an energy storage module, a timer circuit and a suspension control module. Wherein the timer circuit is connected with the hydrogen fuel cell module.
The voltage stabilizing unit is connected with the hydrogen fuel cell module, the energy storage module and the suspension control module and is used for stabilizing the unstable direct current power output by the hydrogen fuel cell module so as to output the unstable direct current power to the suspension control module and/or the energy storage module.
When the suspension system is in a rated working condition, the hydrogen fuel cell module is switched to a constant power output mode, and the working state of the hydrogen fuel cell module is controlled and switched according to the capacity condition of the energy storage module. The working state comprises a first working state with the output power not less than the levitation power and a second working state with the output power less than the levitation power.
When the suspension system is in a peak working condition, the hydrogen fuel cell module is switched to a current-limiting output mode, and the energy storage module is switched to a discharging state, so that the hydrogen fuel cell module and the energy storage module output voltage to the voltage stabilizing module to supply power to the suspension control module together.
The practical working conditions of the suspension system are different, the output modes of the hydrogen fuel cell modules are different, the energy storage module is added, the power configuration requirement of the hydrogen fuel cell is greatly reduced, particularly under the peak working condition, the hydrogen fuel cell modules and the energy storage module work cooperatively, the hydrogen fuel cell which can meet the peak power of the suspension system more than 6 times does not need to be configured, only the power is slightly larger than the suspension rated power, and the peak power can also be provided for the suspension system. Under the peak working condition, because the rated power configured by the hydrogen fuel cell is smaller than the peak power of the suspension system in order to improve the utilization rate of the cell, the hydrogen fuel cell module cannot meet the power requirement of the suspension system alone, and at the moment, the energy storage module can be switched to a discharge state to adapt to the suspension system with a high change rate in real time, so that the defect of slow dynamic output response of the hydrogen fuel cell is overcome. The suspension system can be set to be more than 1.2 times of the suspension rated power (the total power of the general working condition is 1.1 times of the rated power determined according to the operation condition of the suspension system), and the system cost can be greatly reduced.
The maximum output power of the fuel cell power supply system for rated power is limited, but the output power can be adjusted. When the suspension system is in rated working condition operation, the fuel cell controls the output power by controlling the air inlet valve and the air outlet valve, and the output power of the fuel cell does not reach the use limit value. When the suspension system runs at peak power, the control system limits the output current according to the limit output power of the fuel cell by detecting the output voltage of the fuel cell to ensure that the fuel cell works in the limit power output state.
When the hydrogen fuel cell module switches the working state, the timer circuit resets and starts to time to obtain the corresponding working state duration and the output voltage change value of the voltage stabilizing module in the working state duration, and the timer circuit is used for calculating the ratio of the suspension single-cycle control working time to the working state duration so that the product of the ratio and the output voltage change value is less than one ten thousandth of the suspension control working voltage.
Specifically, when the capacity of the energy storage module is lower than a preset value, the hydrogen fuel cell module is controlled to be switched to a first working state, the ratio of the suspension single-cycle control working time to the duration of the first working state and the corresponding output voltage rising value are calculated, and the product of the ratio and the output voltage rising value is smaller than one ten-thousandth of the suspension control working voltage. And when the capacity of the energy storage module is not lower than a preset value, controlling the hydrogen fuel cell module to be switched to a second working state, and calculating the ratio of the suspension single-cycle control working time to the duration time of the second working state and the corresponding output voltage drop value, so that the product of the ratio and the output voltage drop value is less than one ten thousandth of the suspension control working voltage.
It can be understood that under the rated working condition, the energy storage module tracks the suspension power in real time, the charging and discharging states are switched according to the actual working condition, so as to adjust the shortage or the surplus of the output power of the hydrogen fuel cell module, therefore, the output voltage of the voltage stabilizing module fluctuates periodically within a certain time range, therefore, a timer circuit is added for timing the duration time of each working state, the product of the ratio and the output voltage variation value is smaller than one ten thousandth of the current suspension control working voltage by calculating the ratio of the suspension single-cycle control working time to the duration time of the working state and the output voltage variation value of the voltage stabilizing module within the corresponding duration time of the working state, and the working state duration time and the output voltage variation value are well controlled to ensure that the input power supply voltage of the suspension system is in the voltage stabilizing working state.
In addition, the working state of the hydrogen fuel cell is selected according to the capacity condition of the energy storage module, the frequent switching of the charging and discharging states of the energy storage module and the frequent switching of the working state of the hydrogen fuel cell module caused by suspension control fluctuation are avoided, and the service life is prolonged.
In one embodiment, an energy storage module includes an energy storage element and an energy storage power switching device. The energy storage power switch element is connected with the energy storage module, and is used for enabling the energy storage module and the hydrogen fuel cell module to output a stable direct current power supply to the suspension control module together when the energy storage power switch element is switched on, and enabling the hydrogen fuel cell module to output the stable direct current power supply to the energy storage module through the voltage stabilizing unit to charge when the energy storage power switch element is switched off.
The circuit introduces the energy storage power switch element for switching the charging and discharging states of the energy storage module according to actual requirements, particularly the dynamic output response of the hydrogen fuel cell is slow, the hydrogen fuel cell cannot adapt to a suspension system with a high change rate in real time, and when the energy storage power switch element is switched on, the energy storage module can track the suspension power in real time and supply power, so that the defect of slow dynamic output response of the hydrogen fuel cell is overcome.
In one embodiment, the voltage stabilizing unit comprises a battery power switch module, an inductor and a battery filter capacitor;
the battery power switch module comprises a first battery power switch device and a second battery power switch device; the first battery power switch device is connected with the second battery power switch device;
the battery filter capacitor comprises a first battery filter capacitor and a second battery filter capacitor; the first battery filter capacitor is connected to the positive electrode end and the grounding end of the hydrogen fuel battery module, and the first battery power switch device and the second battery power switch device are respectively connected to the two ends of the battery filter capacitor;
a first port of the inductor is connected with a first common wiring point between the first power supply power switching device and the second power supply power switching device, and a second port of the inductor is connected with a first port of the anode of the intermediate direct current loop;
and a second port of the anode of the intermediate direct current loop is connected with a second common wiring point between the energy storage power switching element and the second battery filter capacitor.
It can be understood that the first battery filter capacitor, the first battery power switch device, the second battery power switch device, the inductor, the second battery filter capacitor and the energy storage module form a voltage-stabilizing direct-current power supply with an energy storage function.
In one embodiment, the levitation control module comprises a control power switch module and a levitation electromagnet;
the control power switch module comprises a first control power switch device and a second control power switch device; the first control power switch device is connected with the second common junction point;
the suspension electromagnet is connected with the first control power switch device and the second control power switch device, and the second control power switch device is connected with a third common wiring point between the suspension electromagnet and the first control power switch device;
the first control power switch device is used for adjusting the duty ratio to control the output current of the suspension electromagnet, and the second control power switch device is used for providing a follow current loop for the suspension electromagnet.
When the hydrogen fuel cell module is in a constant power output mode and the voltage value of the positive electrode end of the hydrogen fuel cell module is higher than the voltage value of the positive electrode end of the intermediate direct current loop, the first cell power switch device, the second cell power switch device, the inductor and the second filter capacitor form a voltage reduction and voltage stabilization circuit, and the inductor and the second filter capacitor form a voltage reduction and filter circuit; the first battery power switch device and the second battery power switch device work complementarily under rated switching frequency, and the output voltage and the output current of the first battery power switch device are controlled by adjusting the duty ratio of the first battery power switch device, so that the hydrogen fuel cell is kept in a constant power output mode;
when the voltage value of the positive terminal of the intermediate direct current loop is higher than the voltage value of the positive terminal of the energy storage module, the energy storage power switching element is turned off and used for charging the energy storage element;
and when the voltage value of the positive terminal of the energy storage module is higher than the voltage value of the positive terminal of the intermediate direct current loop, the energy storage power switch element is switched on and is used for outputting voltage to the suspension control module together with the energy storage element and the hydrogen fuel cell module.
As shown in fig. 2, a schematic diagram of a hydrogen fuel cell based levitation control power supply circuit is provided. F _ BAT is a hydrogen fuel cell module, EA1 and EA2 are respectively a first battery filter capacitor and a second battery filter capacitor, LA1 is an inductor, E1 is an energy storage module, a super capacitor, a lithium battery and the like can be selected, QA1, QA2 and QA3 are respectively a first battery power switch device, a second battery power switch device and an energy storage power switch element, MOS, IGBT and the like can be selected, QB1 and QB2 are respectively a first control power switch device and a second control power switch device to form a suspension electromagnet control chopper circuit, MOS, IGBT and the like can be selected, YA1 is a suspension electromagnet, and a DC + end is an anode end of an intermediate direct current loop.
Because the voltage fluctuation period of the hydrogen fuel cell is far lower than the control period of the suspension electromagnet, the hydrogen fuel cell adopts a constant power working mode when a suspension system is in a rated working condition, and the voltage of a direct current F _ BAT + end output by F _ BAT is higher than that of a DC + end voltage at the moment, QA1, QA2, LA1 and EA2 form a voltage reduction and voltage stabilization circuit, wherein QA1 and QA2 work complementarily under rated switching frequency, the output voltage and the output current are controlled by adjusting the duty ratio of QA1, so that the hydrogen fuel cell is kept in the constant power working mode, LA1 and EA2 form a voltage reduction and filter circuit, and QA2 is LA1 inductive follow current; QB1 and QB2 form a suspension control chopper circuit, YA1 is a suspension electromagnet, output current is controlled by controlling duty ratio of QB1 during work, and QB2 provides a follow current loop for YA 1; when the system works, when the voltage of the DC + end is higher than the voltage of BAT +, the system is automatically charged through the QA3 built-in diode, and the voltage of the BAT + end is basically equal to that of the DC + end under normal working conditions.
When the suspension control works in a peak working condition, the output power of the hydrogen fuel cell cannot meet the suspension control requirement at the moment, the DC + terminal voltage is reduced, QA3 is conducted when the system detects that the DC + terminal voltage is lower than the BAT + terminal voltage, E1 and F _ BAT are connected in parallel and output together, and electric energy is provided for the suspension control; when the suspension system recovers to a normal working condition, the output power of the fuel cell is larger than the power required by suspension control, the voltage of the DC + end rises, QA3 is turned off when the forward current from the DC + end to the BAT + end is detected, and the system recovers to a suspension rated working condition in a working state.
Claims (4)
1. A hydrogen fuel cell based levitation control power supply circuit, the circuit comprising:
the device comprises a hydrogen fuel cell module, a voltage stabilizing unit, an energy storage module, a timer circuit and a suspension control module; the timer circuit is connected with the hydrogen fuel cell module;
the voltage stabilizing unit is connected with the hydrogen fuel cell module, the energy storage module and the suspension control module and is used for stabilizing an unstable direct current power supply output by the hydrogen fuel cell module so as to output the unstable direct current power supply to the suspension control module and/or the energy storage module;
when the suspension system is in a rated working condition, the hydrogen fuel cell module is switched to a constant power output mode, and the working state of the hydrogen fuel cell module is controlled and switched according to the capacity condition of the energy storage module; the working states comprise a first working state with the output power not less than the suspension power and a second working state with the output power less than the suspension power;
when the working state is switched, the timer circuit resets and starts to time to obtain the corresponding working state duration and the output voltage change value of the voltage stabilizing module in the working state duration, and the timer circuit is used for calculating the ratio of the suspension single-cycle control working time to the working state duration so that the product of the ratio and the output voltage change value is less than one ten thousandth of the suspension control working voltage;
when the suspension system is in a peak working condition, the hydrogen fuel cell module is switched to a current-limiting output mode, and the energy storage module is switched to a discharging state, so that the hydrogen fuel cell module and the energy storage module output voltage to the voltage stabilizing module to supply power to the suspension control module together.
2. The circuit of claim 1, wherein the energy storage module comprises an energy storage element and an energy storage power switching device;
the energy storage power switch device is connected with the energy storage module, and is used for enabling the energy storage module and the hydrogen fuel cell module to output a stable direct current power supply to the suspension control module together when the energy storage power switch device is switched on, and enabling the hydrogen fuel cell module to output a stable direct current power supply to the energy storage module through the voltage stabilizing unit to charge when the energy storage power switch device is switched off.
3. The circuit of claim 2, wherein the voltage regulator unit comprises a battery power switch module, an inductor and a battery filter capacitor;
the battery power switch module comprises a first battery power switch device and a second battery power switch device; the first battery power switch device is connected with the second battery power switch device;
the battery filter capacitor comprises a first battery filter capacitor and a second battery filter capacitor; the first battery filter capacitor is connected to the positive end and the grounding end of the hydrogen fuel battery module, and the first battery power switch device and the second battery power switch device are respectively connected to the two ends of the battery filter capacitor;
a first port of the inductor is connected with a first common wiring point between the first battery power switching device and the second battery power switching device, and a second port of the inductor is connected with a first port of the positive electrode of the intermediate direct-current loop;
and a second port of the anode of the intermediate direct current loop is connected with a second common wiring point between the energy storage power switch device and the second battery filter capacitor.
4. The circuit of claim 3, wherein the levitation control module comprises a control power switch module and a levitation electromagnet;
the control power switch module comprises a first control power switch device and a second control power switch device; the first control power switch device is connected with the second common junction point;
the suspension electromagnet is connected with the first control power switch device and the second control power switch device, and the second control power switch device is connected with a third common wiring point between the suspension electromagnet and the first control power switch device;
the first control power switch device is used for adjusting the duty ratio to control the output current of the suspension electromagnet, and the second control power switch device is used for providing a follow current loop for the suspension electromagnet;
when the hydrogen fuel cell module is in a constant power output mode and the voltage value of the positive electrode end of the hydrogen fuel cell module is higher than the voltage value of the positive electrode end of the intermediate direct current loop, the first cell power switch device, the second cell power switch device, the inductor and the second cell filter capacitor form a voltage reduction and voltage stabilization circuit, and the inductor and the second cell filter capacitor form a voltage reduction and voltage stabilization circuit; the first battery power switch device and the second battery power switch device work complementarily under a rated switching frequency, and the duty ratio of the first battery power switch device is adjusted to control the output voltage and the output current of the first battery power switch device, so that the hydrogen fuel battery is kept in a constant power output mode;
when the voltage value of the positive terminal of the intermediate direct current loop is higher than the voltage value of the positive terminal of the energy storage module, the energy storage power switch device is turned off and is used for charging the energy storage element;
and when the voltage value of the positive terminal of the energy storage module is higher than the voltage value of the positive terminal of the intermediate direct current loop, the energy storage power switch device is switched on and is used for outputting voltage to the suspension control module together with the energy storage element and the hydrogen fuel cell module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320173008.2U CN218876912U (en) | 2023-01-30 | 2023-01-30 | Suspension control power supply circuit based on hydrogen fuel cell |
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| CN202320173008.2U CN218876912U (en) | 2023-01-30 | 2023-01-30 | Suspension control power supply circuit based on hydrogen fuel cell |
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