CN116014799A - Regenerative braking energy absorption device, method and medium - Google Patents
Regenerative braking energy absorption device, method and medium Download PDFInfo
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Abstract
The application discloses regeneration braking energy absorbing device, method and medium is applied to station energy recovery field, and the device includes: the energy storage feedback unit, the auxiliary inversion unit, the braking resistance unit and the energy management unit are connected with a ground emergency power supply, a direct current bus, the energy storage feedback unit, the auxiliary inversion unit, the braking resistance unit and the controller respectively, are used for detecting the direct current bus, monitoring the energy storage feedback unit and the auxiliary inversion unit, and controlling the working states of the energy storage feedback unit and the auxiliary inversion unit according to the detection condition of the detected direct current bus and the monitoring results of the energy storage feedback unit and the auxiliary inversion unit so as to realize the storage and release of regenerative braking energy.
Description
Technical Field
The present application relates to the field of station energy recovery, and in particular, to a regenerative braking energy absorption apparatus, method, and medium.
Background
Along with the rapid development of urban rail transit, the power consumption of subway trains is greatly increased. In urban rail transit systems, the power consumption of the traction load is substantially more than 50% of the total power consumption. Because the distance between subway stations is smaller, the subway brakes frequently during operation, generated braking electric energy is more, about 40% of energy is wasted in the form of braking resistor consumption except that part of energy is directly absorbed by adjacent subways, and meanwhile, environmental control equipment is required to be added due to heat generated by the braking resistor, so that the cost is increased.
Along with the progress of technology, various regenerative braking energy absorbing devices are gradually applied to urban rail transit for recycling regenerative braking energy, and besides adopting resistance consumption, energy storage or inversion feedback modes can be adopted. However, under the situation that urban rail transit construction in China rapidly progresses, the technical performance and economic indexes are difficult to be optimized by only a single product.
Therefore, the development of the regenerative braking energy absorbing device which is reasonable in price and advanced in technology is significant.
Disclosure of Invention
The purpose of the application is to provide a regenerative braking energy absorbing device, a regenerative braking energy absorbing method and a regenerative braking energy absorbing medium, so that the regenerative braking energy absorbing device, the regenerative braking energy absorbing method and the regenerative braking energy absorbing medium realize storage and release of regenerative braking energy, have the advantages of energy storage feedback, resistance braking and inversion feedback devices, not only can reduce the capacity of vehicle-mounted equipment and reduce the energy consumption of a train, but also can enable electric energy to be effectively integrated into a station ground electromechanical equipment power supply system to provide power for station air conditioners and illumination systems, and realize the maximum utilization of energy generated by train regenerative braking through the energy management of the device, thereby achieving the purpose of energy conservation.
To solve the above technical problem, the present application provides a regenerative braking energy absorbing device, including: the energy storage feedback unit, the auxiliary inversion unit, the braking resistor unit and the energy management unit;
the energy management unit is respectively connected with the direct current bus, the energy storage feedback unit, the auxiliary inversion unit, the braking resistor unit and the controller and is used for detecting the direct current bus, monitoring the energy storage feedback unit and the auxiliary inversion unit, and controlling the working states of the energy storage feedback unit and the auxiliary inversion unit according to the detection condition of detecting the direct current bus and the monitoring results of the energy storage feedback unit and the auxiliary inversion unit so as to realize the storage and release of regenerative braking energy;
the energy storage feedback unit is connected with the direct current bus through the energy management unit and is used for storing regenerated energy generated by regenerative braking of the train or releasing the stored energy for the train to use;
the auxiliary inversion unit is connected with the direct current bus through the energy management unit and is simultaneously integrated into a power supply unit of the ground electromechanical device.
Preferably, the system further comprises a ground dispatching unit connected with the energy management unit, and the ground dispatching unit is used for receiving fault information of the bidirectional converter and the auxiliary inversion unit sent by the energy management unit so as to remind a user of processing.
Preferably, the energy storage feedback unit comprises an energy storage element and the bidirectional converter.
Preferably, the energy management unit includes:
the direct current bus voltage detection module is connected with the direct current bus and is used for detecting the direct current bus voltage;
the bidirectional converter fault detection module is connected with the energy storage feedback unit and is used for detecting whether the bidirectional converter has faults or not;
the auxiliary inversion unit fault detection module is connected with the auxiliary inversion unit and is used for detecting whether the auxiliary inversion unit has faults or not;
the brake resistor contactor is connected with the brake voltage unit and is used for being connected with the brake resistor unit when the control contactor K1 and the control contactor K2 are powered on;
the logic control module is respectively connected with the direct current bus voltage detection module, the bidirectional converter fault detection module, the auxiliary inversion unit fault detection module, the brake resistor contactor and the data transmission module, and is used for uploading the direct current bus voltage, the fault condition of the bidirectional converter and the fault condition of the auxiliary inversion unit to the ground dispatching unit through the data transmission module and controlling the energy storage feedback unit and the auxiliary inversion unit to work.
In order to solve the technical problem, the present application further provides a regenerative braking energy absorbing method, which is applied to a regenerative braking energy absorbing device including an energy storage feedback unit, an auxiliary inverter unit, a braking resistor unit and an energy management unit, and the method includes:
detecting the direct current bus;
monitoring the energy storage feedback unit and the auxiliary inversion unit;
and controlling the working states of the energy storage feedback unit and the auxiliary inversion unit according to the detection condition of the direct current bus and the monitoring result of the energy storage feedback unit and the auxiliary inversion unit so as to realize the storage and release of regenerative braking energy.
Preferably, the detecting the dc bus includes:
detecting a first voltage value of the direct current bus;
the energy storage feedback unit comprises an energy storage element and a bidirectional converter, and the monitoring of the energy storage feedback unit and the auxiliary inversion unit comprises the following steps:
and monitoring fault conditions of the double-current phase changer and the auxiliary inversion unit.
Preferably, when the bidirectional converter and the auxiliary inverter unit have no faults, the controlling the working states of the energy storage feedback unit and the auxiliary inverter unit according to the detection condition of detecting the direct current bus and the monitoring result of the energy storage feedback unit and the auxiliary inverter unit to realize the storage and release of regenerative braking energy includes:
working condition 1: when the first voltage value is smaller than a first preset voltage value, controlling the bidirectional converter to work, controlling the energy storage feedback unit to discharge, and enabling the auxiliary inversion unit to be in a standby state;
working condition 2: when the first starting voltage value is smaller than the second starting voltage value, controlling the bidirectional converter to work, controlling the energy storage feedback unit to charge, and enabling the auxiliary inversion unit to be in a standby state;
working condition 3: when the second starting voltage value is smaller than the first voltage value and smaller than the third starting voltage value, the bidirectional converter and the auxiliary inversion unit are controlled to work, and at the moment, the energy storage feedback unit is charged, and the auxiliary inversion unit supplies power to a ground electromechanical equipment power supply system;
working condition 4: when the third starting voltage value is smaller than the first voltage value, the bidirectional converter and the auxiliary inverter device are controlled to work, meanwhile, a brake resistor is connected by controlling a contactor K1 and a contactor K2 to be electrified, at the moment, an energy storage feedback device is charged, the auxiliary inverter device supplies power to a ground electromechanical equipment power supply system, and the brake resistor device absorbs redundant energy to ensure safe and reliable operation of traction network voltage;
wherein the first preset voltage value < the first starting voltage value < the second starting voltage value < the third starting voltage value < the second preset voltage value.
Preferably, when at least one of the bidirectional converter and the auxiliary inverter unit has a fault, the controlling the working states of the energy storage feedback unit and the auxiliary inverter unit according to the detection condition of the dc bus and the monitoring result of the energy storage feedback unit and the auxiliary inverter unit to realize the storage and release of regenerative braking energy includes:
working condition 5: when only the auxiliary inverter device fails and the third starting voltage value is smaller than the first voltage value, the energy storage feedback unit and the braking resistance unit execute according to the working condition 4, and the auxiliary inverter unit stops;
working condition 6: when only the bidirectional converter fails and the third starting voltage value is smaller than the first voltage value, the bidirectional converter is stopped, the auxiliary inversion unit works, and the brake resistor unit starts to absorb residual energy;
working condition 7: when the bidirectional converter and the auxiliary inverter are both in fault and the third starting voltage value is smaller than the first voltage value, the bidirectional converter and the auxiliary inverter are stopped, the brake resistor is connected, and the brake resistor unit starts to absorb residual energy.
Preferably, when the traction power supply system suddenly fails, a first voltage value of the dc bus is zero, and the controlling the working states of the energy storage feedback unit, the auxiliary inverter unit and the brake resistor unit according to the first voltage value to perform regenerative energy recovery and distribution includes:
and when the first voltage is equal to zero, controlling the bidirectional converter to work, and controlling the energy storage feedback unit to release current to supply power for a train.
To solve the above technical problem, the present application further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the regenerative braking energy absorbing method as described above.
The regenerative braking energy absorbing device comprises an energy storage, inversion and resistance multi-system hybrid regenerative braking energy absorbing device, wherein the energy management unit is respectively connected with a ground emergency power supply, a direct current bus, the energy storage feedback unit, the inversion assisting unit, the braking resistance unit and a controller and is used for detecting the direct current bus, monitoring the energy storage feedback unit and the inversion assisting unit, controlling the working states of the energy storage feedback unit and the inversion assisting unit according to the detection condition of the detection direct current bus and the monitoring result of the energy storage feedback unit and the inversion assisting unit so as to realize the storage and release of regenerative braking energy.
Drawings
For a clearer description of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a regenerative braking energy absorption device provided in an embodiment of the present application;
FIG. 2 is a flow chart of a regenerative braking energy absorption method provided by an embodiment of the present application;
FIG. 3 is a flow chart illustrating a method for regenerative braking energy absorption according to an embodiment of the present disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments herein without making any inventive effort are intended to fall within the scope of the present application.
The core of the application is to provide a regenerative braking energy absorbing device, a regenerative braking energy absorbing method and a regenerative braking energy absorbing medium, so that the regenerative braking energy absorbing device, the regenerative braking energy absorbing method and the regenerative braking energy absorbing medium realize the storage and release of regenerative braking energy, have the advantages of energy storage feedback, resistance braking and inversion feedback devices, not only can reduce the capacity of vehicle-mounted equipment and reduce the energy consumption of a train, but also can enable electric energy to be effectively integrated into a station ground electromechanical equipment power supply system to provide power for station air conditioners and illumination systems, and realize the maximum utilization of energy generated by train regenerative braking through the energy management of the system, thereby achieving the purpose of energy saving.
The operations such as detection and monitoring in the regenerative braking energy absorption method provided by the application can be realized by a controller in an upper computer, for example, the controller can be a micro control unit (Microcontroller Unit, MCU), and the operations can be realized by other controllers except the MCU, and the application is not limited.
In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description.
Fig. 1 is a structural diagram of a regenerative braking energy absorbing device according to an embodiment of the present application, as shown in fig. 1, the device includes: the energy storage feedback unit 4, the auxiliary inversion unit 3, the braking resistance unit 2 and the energy management unit 1;
the energy management unit 1 is respectively connected with the direct current bus, the energy storage feedback unit 4, the auxiliary inversion unit 3, the braking resistor unit 2 and the controller and is used for detecting the direct current bus, monitoring the energy storage feedback unit 4 and the auxiliary inversion unit 3, and controlling the working states of the energy storage feedback unit 4 and the auxiliary inversion unit 3 according to the detection condition of the direct current bus and the monitoring results of the energy storage feedback unit 4 and the auxiliary inversion unit 3 so as to realize the storage and release of regenerative braking energy;
the energy storage feedback unit 4 is connected with the direct current bus through the energy management unit 1 and is used for storing regenerated energy generated by train regenerative braking or releasing the stored energy for the use of the train;
the auxiliary inverter unit 3 is connected to the dc bus through the energy management unit 1 while being incorporated into a power supply unit of the ground electromechanical device.
Specifically, in fig. 1, through an urban power grid 10 with the specification of AC10kV/35kV, voltage drop processing is performed through a step-down transformer 11, power is supplied through a rectifier unit 12, a train a and a train B are connected with a contact net 13 and placed on a steel rail 14, an energy management unit 1 is respectively connected with a braking resistor unit 2, an auxiliary inversion unit 3, an energy storage feedback unit 4, a ground dispatching unit 5 and a ground emergency power supply 8, wherein the energy storage feedback unit 4 comprises an energy storage element 7 and a bidirectional converter 6, the auxiliary inversion unit 3 is connected with a ground electromechanical device power supply system 9, and the ground electromechanical device power supply system 9 can comprise air conditioning and other devices. According to the regenerative braking energy absorbing device provided by the embodiment, the energy management unit 1 of the core is used for monitoring the energy storage feedback unit 4 and the auxiliary inversion unit 3 through detecting the direct current bus, the energy management unit 1 is used for recovering and distributing the regenerative braking energy of the train through detecting the voltage of the direct current bus, the monitoring results of the energy storage feedback unit 4 and the auxiliary inversion unit 3 are used for controlling the working states of the energy storage feedback unit 4 and the auxiliary inversion unit 3 so as to realize the storage and release of the regenerative braking energy, and different working conditions are executed for different working states of the bidirectional converter 6 and the auxiliary inversion unit 3 in the energy storage feedback unit 4. The energy storage feedback unit 4, the auxiliary inversion unit 3 and the braking resistance unit 2 work in a coordinated manner under the control of the core energy management unit 1, the energy storage feedback unit 4 is taken as a main part, the auxiliary inversion unit 3 is taken as an auxiliary brake, and meanwhile, the braking resistance unit 2 is taken as a backup brake, so that the recycling of the regenerative braking energy of the subway station is realized by adopting an energy storage-inversion-resistance multi-unit hybrid regenerative braking recycling scheme. The existing train resistance braking device is not required to be abandoned, and the energy generated by train regenerative braking can be recycled to the maximum extent. The energy storage feedback unit 4 is connected with the direct current bus through the energy management unit 1 and is used for storing the regenerated energy generated by regenerative braking of the train or releasing the stored energy for the train to use, in addition, when the traction network suddenly fails, emergency traction power supply can be provided for the train through the energy storage feedback unit 4, even the train can be maintained to run at a low speed to a nearby station, the energy storage feedback unit 4 ensures the normal running of the train in the station and can ensure the low-speed running of the train under special conditions until the train is abutted to the nearby station. The device can fully utilize the regenerative braking energy of the subway vehicle, reduce the capacity of the train resistance braking device, reduce the temperature rise of the subway tunnel and reduce the energy consumption of ventilation equipment; and the adverse effect of sudden power failure of the traction network on the train can be solved, energy conservation and emission reduction are realized, and the overall economic benefit of the subway station is effectively improved.
It can be seen that, the regenerative braking energy absorbing device provided in this embodiment is a regenerative braking energy absorbing device including an energy storage, inversion and resistance multi-system hybrid type, where the energy storage feedback unit 4, the auxiliary inversion unit 3, the braking resistance unit 2 and the energy management unit 1 are respectively connected with the ground emergency power supply 8, the dc bus, the energy storage feedback unit 4, the auxiliary inversion unit 3, the braking resistance unit 2 and the controller, and are used for detecting the dc bus, monitoring the energy storage feedback unit 4 and the auxiliary inversion unit 3, and controlling the working states of the energy storage feedback unit 4 and the auxiliary inversion unit 3 according to the detection condition of the detected dc bus and the monitoring result of the energy storage feedback unit 4 and the auxiliary inversion unit 3.
On the basis of the above embodiment, as a preferred embodiment, the system further comprises a ground dispatching unit 5 connected with the energy management unit 1, and the ground dispatching unit is used for receiving fault information of the bidirectional converter 6 and the auxiliary inverter unit 3 sent by the energy management unit 1 so as to remind a user of processing.
Specifically, the embodiment further comprises a ground dispatching unit 5 connected with the energy management unit 1, the ground dispatching unit 5 is in butt joint with a ground dispatching center, fault information of the bidirectional converter 6 and the auxiliary inversion unit 3 can be transmitted in time, and workers in the ground dispatching center can rapidly acquire corresponding fault information, so that the effect of rapidly processing the information is achieved.
It can be seen that by adding the ground dispatching unit 5, the staff in the ground dispatching center can know the actual situation to make corresponding judgment.
On the basis of the above embodiment, as a preferred embodiment, the energy storage feedback unit 4 includes the energy storage element 7 and the bidirectional converter 6.
Specifically, in this embodiment, the energy storage feedback unit 4 includes an energy storage element 7 and a bidirectional converter 6, where the energy storage element 7 stores energy, and the bidirectional converter 6 has a charge and discharge integrated design, so as to implement bidirectional energy flow of the ac system and the dc system; the grid-connected operation and the isolated network operation are supported, and the automatic switching between the grid-connected state and the isolated network state can be realized; the relay protection device also has a perfect relay protection function, and can effectively prevent the abnormal damage of the inverter.
It can be seen that the energy storage element 7 and the bidirectional converter 6 realize the function of the energy storage feedback unit 4, and the function of storing the regenerated energy generated by the train regenerative braking or releasing the stored energy for the train to use is realized.
On the basis of the above-described embodiments, as a preferred embodiment, the energy management unit 1 includes:
the direct current bus voltage detection module is connected with the direct current bus and is used for detecting the direct current bus voltage;
the bidirectional converter 6 fault detection module is connected with the energy storage feedback unit 4 and is used for detecting whether the bidirectional converter 6 has faults or not;
the auxiliary inverter unit 3 fault detection module is connected with the auxiliary inverter unit 3 and is used for detecting whether the auxiliary inverter unit 3 has a fault or not;
the brake resistor contactor is connected with the brake voltage unit and is used for switching in the brake resistor unit 2 when the control contactor K1 and the control contactor K2 are powered on;
the logic control module is respectively connected with the direct current bus voltage detection module, the bidirectional converter 6 fault detection module, the auxiliary inversion unit 3 fault detection module, the brake resistor contactor and the data transmission module, and is used for uploading the direct current bus voltage, the bidirectional converter 6 fault condition and the auxiliary inversion unit 3 fault condition to the ground dispatching unit 5 through the data transmission module and controlling the energy storage feedback unit 4 and the auxiliary inversion unit 3 to work.
Specifically, the voltage detection module in the present embodiment is configured to detect a dc bus voltage; the bidirectional converter fault detection module is used for detecting whether the bidirectional converter 6 has faults or not; the auxiliary inversion unit fault detection module is used for detecting whether the auxiliary inversion unit 3 has faults or not; the fault conditions of the bidirectional converter 6 and the auxiliary inversion unit 3 are uploaded to the ground dispatching unit 5 through the data transmission module according to the direct current bus voltage and the fault conditions of the bidirectional converter, and the energy storage feedback unit 4 and the auxiliary inversion unit 3 are controlled to work.
It can be seen that the direct current bus voltage is detected through the direct current bus voltage detection module, whether the bidirectional converter 6 and the auxiliary inversion unit 3 have faults is detected through the bidirectional converter fault detection module and the auxiliary inversion unit fault detection module, the ground dispatching unit 5 is transmitted to a worker at the ground dispatching center, and the worker can perform corresponding judgment operation according to the working conditions of the bidirectional converter 6 and the auxiliary inversion unit 3.
Fig. 2 is a flowchart of a regenerative braking energy absorbing method according to an embodiment of the present application, and as shown in fig. 2, the method is applied to a regenerative braking energy absorbing device including an energy storage feedback unit 4, an auxiliary inverter unit 3, a braking resistor unit 2, and an energy management unit 1, and the method includes:
s10: and detecting a direct current bus.
S11: the monitoring energy storage feedback unit 4 and the auxiliary inversion unit 3.
S12: and controlling the working states of the energy storage feedback unit 4 and the auxiliary inverter unit 3 according to the detection condition of the detection direct current bus and the monitoring results of the energy storage feedback unit 4 and the auxiliary inverter unit 3 so as to realize the storage and release of regenerative braking energy.
Specifically, in this embodiment, the storage and release of regenerative braking energy are achieved by detecting the voltage value in the dc bus and combining the working states of the energy storage feedback unit 4 and the auxiliary inverter unit 3. The regenerative braking refers to that braking energy (direct current electric energy) generated by a train is reversely fed back to a direct current traction network for other trains which are started to be pulled. However, when the electric energy fed back to the traction network by the regenerative braking of the train cannot be completely absorbed by other traction trains, the surplus energy increases the voltage of the direct current traction network. In order to improve the running reliability of the train, the voltage value of the traction network cannot exceed a certain range, the voltage range of the traction network is 1000-1800V for a traction power supply system of DC1500V, and the voltage range of the traction network is 500-900V for a traction power supply system of DC 750V. For the traction network voltage, three starting thresholds are set in the energy management unit 1, so a first starting voltage value U1, a second starting voltage value U2 and a third starting voltage value U3 are set, and the lowest voltage value of the traction power supply system is smaller than the first starting voltage value U1, the second starting voltage value U2 and the third starting voltage value U3. Different working conditions are executed for different voltage values in the direct current bus and working states of the energy storage feedback unit 4 and the auxiliary inversion unit 3.
It can be seen that the regenerative braking energy absorption method provided in this embodiment is applied to the energy storage feedback unit 4, the auxiliary inverter unit 3, the braking resistor unit 2, and the energy management unit 1, and the energy storage feedback unit 4 and the auxiliary inverter unit 3 are monitored by detecting the dc bus, and the working states of the energy storage feedback unit 4 and the auxiliary inverter unit 3 are controlled according to the detection condition of the detected dc bus and the monitoring results of the energy storage feedback unit 4 and the auxiliary inverter unit 3, so as to realize the storage and release of regenerative braking energy. The energy storage device has the advantages of energy storage feedback, resistance braking and inversion feedback devices, and can reduce the capacity of vehicle-mounted equipment and reduce the energy consumption of a train.
On the basis of the above embodiment, as a preferred embodiment, detecting the dc bus includes:
detecting a first voltage value of a direct current bus;
the energy storage feedback unit 4 comprises an energy storage element 7 and a bidirectional converter 6, and the monitoring energy storage feedback unit 4 and the auxiliary inversion unit 3 comprise:
the fault conditions of the double current phase converter and the auxiliary inverter unit 3 are monitored.
Specifically, in this embodiment, by detecting the first voltage value of the dc bus, where the first voltage value corresponds to the traction network voltage in the contact network. For example, for a traction power supply system of DC750V, a traction network voltage range of 500-900V is specified. The first voltage value, i.e. the traction network voltage, is then required to be within 500-900V. And monitors the bi-directional converter 6 and the auxiliary inverter unit 3 in the energy storage feedback unit 4. The storage and release of regenerative braking energy is achieved.
Therefore, by detecting the first voltage value of the direct current bus and monitoring the fault conditions of the double-current phase converter and the auxiliary inversion unit 3 and transmitting the fault to a worker at the ground dispatching center, the worker can perform corresponding judgment operation according to the working conditions of the double-current converter 6 and the auxiliary inversion unit 3, and the storage and release of regenerative braking energy are realized.
On the basis of the foregoing embodiments, as a preferred embodiment, fig. 3 is a flow chart of working condition selection of the regenerative braking energy absorbing method provided in the embodiment of the present application, as shown in fig. 3, when the bidirectional converter 6 and the auxiliary inverter unit 3 have no fault, the controlling the working states of the energy storage feedback unit 4 and the auxiliary inverter unit 3 according to the detection condition of the detected dc bus and the monitoring results of the energy storage feedback unit 4 and the auxiliary inverter unit 3 to implement storage and release of the regenerative braking energy includes:
working condition 1: when the first voltage value is smaller than a first preset voltage value, controlling the bidirectional converter 6 to work, controlling the energy storage feedback unit 4 to discharge, and enabling the auxiliary inversion unit 3 to be in a standby state;
working condition 2: when the first starting voltage value is smaller than the first voltage value and smaller than the second starting voltage value, the bidirectional converter 6 is controlled to work, the energy storage feedback unit 4 is controlled to charge, and the auxiliary inversion unit 3 is in a standby state;
working condition 3: when the second starting voltage value is smaller than the first voltage value and smaller than the third starting voltage value, the bidirectional converter 6 and the auxiliary inversion unit 3 are controlled to work, the energy storage feedback unit 4 is charged, and the auxiliary inversion unit 3 supplies power to the ground electromechanical equipment power supply system 9;
working condition 4: when the third starting voltage value is smaller than the first voltage value, the bidirectional converter 6 and the auxiliary inverter device are controlled to work, meanwhile, a brake resistor is connected through controlling the contactor K1 and the contactor K2 to be powered on, at the moment, the energy storage feedback device is charged, the auxiliary inverter device supplies power to the ground electromechanical equipment power supply system 9, and the brake resistor device absorbs redundant energy to ensure safe and reliable operation of traction network voltage;
wherein the first preset voltage value < the first starting voltage value < the second starting voltage value < the third starting voltage value < the second preset voltage value.
Specifically, S13 in the present embodiment: the energy management unit 1 detects the operating state of the bi-directional converter 6 and the auxiliary inverter unit 3. S14: and judging the working states of the bidirectional converter 6 and the auxiliary inversion unit 3. The embodiment describes the normal operation state in detail. S15: the energy management unit 1 detects the catenary first voltage. The first voltage is the traction network voltage U, and three starting thresholds are set in the energy management unit 1, and are a first starting voltage value U1, a second starting voltage value U2, and a third starting voltage value U3 respectively. Taking a DC1500V traction power supply system as an example, for the DC1500V traction power supply system, a traction network voltage range of 1000-1800V is specified, wherein 1000V < U1< U2< U3<1800V. 1000V is the first preset voltage value, 1800V is the second preset voltage value. The system executes 7 working conditions according to the set voltage starting threshold value, the working states of the bidirectional converter 6 and the auxiliary inversion unit 3. The working conditions of the bidirectional converter 6 and the auxiliary inverter unit 3 when the working states are normal are described in detail in this embodiment. Working condition 1: when S16: when the traction network voltage U is less than 1000V, the energy management unit 1 controls the bidirectional converter 6 to work, and at the moment, the energy storage feedback unit 4 discharges, and the auxiliary inversion unit 3 is in a standby state. Working condition 2: when the traction net pressure U, S17: when U1 is less than U2, the energy management unit 1 controls the bidirectional converter 6 to work, and at the moment, the energy storage feedback unit 4 is charged, and the auxiliary inverter unit 3 is in a standby state. Working condition 3: s18: when U2< U < U3, the energy management unit 1 controls the bidirectional converter 6 and the auxiliary inverter unit 3 to work, and at the moment, the energy storage feedback unit 4 charges, and the auxiliary inverter unit 3 supplies power to the ground electromechanical device power supply system 9. Working condition 4: when U3< U, energy management unit 1 controls bidirectional converter 6, supplementary contravariant unit 3 work, and energy management unit 1 is through controlling contactor K1, K2 to get electricity simultaneously for brake resistance inserts, and energy storage feedback unit 4 charges this moment, and supplementary contravariant unit 3 is supplied power to ground electromechanical device power supply system 9, and brake resistance unit 2 absorbs unnecessary energy, guarantees the safe and reliable operation of traction network voltage. It should be noted that, all the working conditions 1-4 are uploaded to the ground dispatching unit 5, and the ground dispatching unit 5 is uploaded to a worker of the ground dispatching center for processing.
It can be seen that, in this embodiment, when the operation states of the bidirectional converter 6 and the auxiliary inverter unit 3 are normal, the working conditions 1 to 4 will be described in detail.
On the basis of the above embodiment, as a preferred embodiment, when at least one of the bidirectional converter 6 and the auxiliary inverter unit 3 has a fault, as shown in fig. 3, controlling the operation states of the energy storage feedback unit 4 and the auxiliary inverter unit 3 according to the detection condition of the detected dc bus and the monitoring results of the energy storage feedback unit 4 and the auxiliary inverter unit 3 to realize the storage and release of regenerative braking energy includes:
working condition 5: when only the auxiliary inverter device fails and the third starting voltage value is smaller than the first voltage value, the energy storage feedback unit 4 and the braking resistance unit 2 execute according to the working condition 4, and the auxiliary inverter unit 3 stops;
working condition 6: when only the bidirectional converter 6 fails and the third starting voltage value is smaller than the first voltage value, the bidirectional converter 6 is stopped, the auxiliary inverter unit 3 works, and the brake resistor unit 2 starts to absorb residual energy;
working condition 7: when both the bidirectional converter 6 and the auxiliary inverter device fail and when the third starting voltage value is smaller than the first voltage value, the bidirectional converter 6 and the auxiliary inverter device are stopped, the brake resistor is connected, and the brake resistor unit 2 starts to absorb residual energy.
Specifically, in this embodiment, the remaining 3 working conditions in the foregoing embodiment are described in detail, that is, working conditions 5 to 7. When any one or all of the bidirectional converter 6 and the auxiliary inversion unit 3 are monitored by the energy management unit 1 to fail, the system immediately controls the failure unit to stop and reports failure information to the ground dispatching center, so that staff is reminded to process in time. In this embodiment, taking a DC1500V traction power supply system as an example, when only the auxiliary inverter unit 3 fails, S22: the energy management unit 1 controls the auxiliary inverter unit 3 to stop and detect the first voltage of the overhead contact line, and when S20: and when U3 is less than U, executing working condition 5: and the energy storage feedback unit 4 and the braking resistance unit 2 execute according to the working condition 4, and the auxiliary inversion unit 3 is stopped. When only the bidirectional converter 6 fails, S21: the energy management unit 1 controls the bi-directional converter 6 to stop and detects the first voltage of the catenary, and when S20: and when U3 is less than U, executing working condition 6: the bidirectional converter 6 is stopped, the auxiliary inversion unit 3 works, and the brake resistor unit 2 starts to absorb residual energy. When both the bidirectional converter 6 and the auxiliary inverter unit 3 fail, S19: the energy management unit 1 controls the bidirectional converter 6, the auxiliary inverter unit 3 to stop and detect the first voltage of the overhead contact line, and when S20: and when U3 is less than U, executing the working condition 7: the bidirectional converter 6 and the auxiliary inversion unit 3 are stopped, the energy management system is powered on by controlling the contactors K1 and K2, so that the brake resistor is connected in, and the brake resistor unit 2 is started to absorb residual energy.
Therefore, in this embodiment, when the working states of the bidirectional converter 6 and the auxiliary inverter unit 3 are not normal, the working conditions 5 to 7 will be described in detail.
On the basis of the above embodiment, as a preferred embodiment, when the traction power supply system suddenly fails, the first voltage value of the dc bus is zero, and the controlling the operation states of the energy storage feedback unit 4, the auxiliary inverter unit 3, and the brake resistor unit 2 according to the first voltage value to perform regenerative energy recovery and distribution includes:
when the first voltage is equal to zero, the bidirectional converter 6 is controlled to work, and the energy storage feedback unit 4 is controlled to release current to supply power for the train.
Specifically, in this embodiment, in addition to the working conditions 1-7, when the traction power supply system suddenly fails, that is, when the voltage of the direct current bus monitored by the energy management unit 1 is 0, the bidirectional converter 6 is controlled to work at this time, and the energy storage feedback unit 4 supplies power to the overhead line system to provide emergency traction power for the train. The train can maintain the train running at a low speed to a nearby station according to the feedback energy.
Therefore, in this embodiment, when the traction power supply system fails, the bidirectional converter 6 is activated to operate, and the energy storage feedback unit 4 is controlled to release current to supply power to the train, so as to realize emergency power supply of the train, and ensure that the train cannot stop running due to sudden power failure, thereby causing traffic disorder at the station.
Finally, the present application also provides a corresponding embodiment of the computer readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps as described in the method embodiments above.
It will be appreciated that the methods of the above embodiments, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored on a computer readable storage medium. With such understanding, the technical solution of the present application, or a part contributing to the prior art or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, performing all or part of the steps of the method described in the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The regenerative braking energy absorbing apparatus, method and medium provided by the present application are described in detail above. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A regenerative braking energy absorbing device, comprising: the energy storage feedback unit, the auxiliary inversion unit, the braking resistor unit and the energy management unit;
the energy management unit is respectively connected with the direct current bus, the energy storage feedback unit, the auxiliary inversion unit, the braking resistor unit and the controller and is used for detecting the direct current bus, monitoring the energy storage feedback unit and the auxiliary inversion unit, and controlling the working states of the energy storage feedback unit and the auxiliary inversion unit according to the detection condition of detecting the direct current bus and the monitoring results of the energy storage feedback unit and the auxiliary inversion unit so as to realize the storage and release of regenerative braking energy;
the energy storage feedback unit is connected with the direct current bus through the energy management unit and is used for storing regenerated energy generated by regenerative braking of the train or releasing the stored energy for the train to use;
the auxiliary inversion unit is connected with the direct current bus through the energy management unit and is simultaneously integrated into a power supply unit of the ground electromechanical device.
2. The regenerative braking energy absorbing device of claim 1, further comprising a ground dispatching unit coupled to the energy management unit for receiving fault information of the bi-directional converter and the auxiliary inverter unit sent by the energy management unit to alert a user to the process.
3. The regenerative braking energy absorbing device of claim 2, wherein the energy storage feedback unit comprises an energy storage element and the bi-directional converter.
4. The regenerative braking energy absorbing device of claim 3, wherein the energy management unit comprises:
the direct current bus voltage detection module is connected with the direct current bus and is used for detecting the direct current bus voltage;
the bidirectional converter fault detection module is connected with the energy storage feedback unit and is used for detecting whether the bidirectional converter has faults or not;
the auxiliary inversion unit fault detection module is connected with the auxiliary inversion unit and is used for detecting whether the auxiliary inversion unit has faults or not;
the brake resistor contactor is connected with the brake voltage unit and is used for being connected with the brake resistor unit when the control contactor K1 and the control contactor K2 are powered on;
the logic control module is respectively connected with the direct current bus voltage detection module, the bidirectional converter fault detection module, the auxiliary inversion unit fault detection module, the brake resistor contactor and the data transmission module, for controlling the DC bus voltage, the fault condition of the bidirectional converter,
And the fault condition of the auxiliary inversion unit is uploaded to the ground scheduling unit through the data transmission module and controls the energy storage feedback unit and the auxiliary inversion unit to work.
5. A regenerative braking energy absorbing method, characterized in that it is applied to a regenerative braking energy absorbing device including an energy storage feedback unit, an auxiliary inverter unit, a braking resistance unit, and an energy management unit, the method comprising:
detecting the direct current bus;
monitoring the energy storage feedback unit and the auxiliary inversion unit;
and controlling the working states of the energy storage feedback unit and the auxiliary inversion unit according to the detection condition of the direct current bus and the monitoring result of the energy storage feedback unit and the auxiliary inversion unit so as to realize the storage and release of regenerative braking energy.
6. The regenerative braking energy absorption method according to claim 5, wherein the detecting the dc bus includes:
detecting a first voltage value of the direct current bus;
the energy storage feedback unit comprises an energy storage element and a bidirectional converter, and the monitoring of the energy storage feedback unit and the auxiliary inversion unit comprises the following steps:
and monitoring fault conditions of the double-current phase changer and the auxiliary inversion unit.
7. The regenerative braking energy absorption method according to claim 6, wherein when the bidirectional converter and the auxiliary inverter unit have no faults, the controlling the operation states of the energy storage feedback unit and the auxiliary inverter unit according to the detection condition of the dc bus and the monitoring result of the energy storage feedback unit and the auxiliary inverter unit to achieve the storage and release of regenerative braking energy comprises:
working condition 1: when the first voltage value is smaller than a first preset voltage value, controlling the bidirectional converter to work, controlling the energy storage feedback unit to discharge, and enabling the auxiliary inversion unit to be in a standby state;
working condition 2: when the first starting voltage value is smaller than the second starting voltage value, controlling the bidirectional converter to work, controlling the energy storage feedback unit to charge, and enabling the auxiliary inversion unit to be in a standby state;
working condition 3: when the second starting voltage value is smaller than the first voltage value and smaller than the third starting voltage value, the bidirectional converter and the auxiliary inversion unit are controlled to work, and at the moment, the energy storage feedback unit is charged, and the auxiliary inversion unit supplies power to a ground electromechanical equipment power supply system;
working condition 4: when the third starting voltage value is smaller than the first voltage value, the bidirectional converter and the auxiliary inverter device are controlled to work, meanwhile, a brake resistor is connected by controlling a contactor K1 and a contactor K2 to be electrified, at the moment, an energy storage feedback device is charged, the auxiliary inverter device supplies power to a ground electromechanical equipment power supply system, and the brake resistor device absorbs redundant energy to ensure safe and reliable operation of traction network voltage;
wherein the first preset voltage value < the first starting voltage value < the second starting voltage value < the third starting voltage value < the second preset voltage value.
8. The regenerative braking energy absorption method according to claim 7, wherein when at least one of the bidirectional converter and the auxiliary inverter unit has a fault, the controlling the operation states of the energy storage feedback unit and the auxiliary inverter unit according to the detection condition of the dc bus and the monitoring results of the energy storage feedback unit and the auxiliary inverter unit to achieve the storage and release of regenerative braking energy comprises:
working condition 5: when only the auxiliary inverter device fails and the third starting voltage value is smaller than the first voltage value, the energy storage feedback unit and the braking resistance unit execute according to the working condition 4, and the auxiliary inverter unit stops;
working condition 6: when only the bidirectional converter fails and the third starting voltage value is smaller than the first voltage value, the bidirectional converter is stopped, the auxiliary inversion unit works, and the brake resistor unit starts to absorb residual energy;
working condition 7: when the bidirectional converter and the auxiliary inverter are both in fault and the third starting voltage value is smaller than the first voltage value, the bidirectional converter and the auxiliary inverter are stopped, the brake resistor is connected, and the brake resistor unit starts to absorb residual energy.
9. The regenerative braking energy absorption method according to any one of claims 6 to 8, wherein when the traction power supply system suddenly fails, the first voltage value of the dc bus is zero, and the controlling the operation states of the energy storage feedback unit, the auxiliary inverter unit, and the braking resistor unit according to the first voltage value to perform regenerative energy recovery distribution comprises:
and when the first voltage is equal to zero, controlling the bidirectional converter to work, and controlling the energy storage feedback unit to release current to supply power for a train.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the regenerative braking energy absorption method according to any of claims 5 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310071423.1A CN116014799A (en) | 2023-02-07 | 2023-02-07 | Regenerative braking energy absorption device, method and medium |
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| CN202310071423.1A CN116014799A (en) | 2023-02-07 | 2023-02-07 | Regenerative braking energy absorption device, method and medium |
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| CN202310071423.1A Pending CN116014799A (en) | 2023-02-07 | 2023-02-07 | Regenerative braking energy absorption device, method and medium |
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