CN219029176U - Braking energy recovery device and overhead contact system tramcar - Google Patents
Braking energy recovery device and overhead contact system tramcar Download PDFInfo
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- CN219029176U CN219029176U CN202223470863.4U CN202223470863U CN219029176U CN 219029176 U CN219029176 U CN 219029176U CN 202223470863 U CN202223470863 U CN 202223470863U CN 219029176 U CN219029176 U CN 219029176U
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Abstract
The utility model provides a braking energy recovery device and a contact net tramcar, wherein the device comprises: the system comprises a current transformation module, a control module and a control module, wherein the current transformation module comprises a first current transformation branch, the input end of the first current transformation branch is connected with a direct current bus of a contact net tramcar, and the current transformation module is used for carrying out voltage reduction treatment on braking electric energy input by the direct current bus; the control module is connected with the current transformation module and is used for receiving the action signal of the overhead contact system tramcar and changing the working condition of the current transformation module according to the action signal; the energy storage module is connected with the output end of the first current transformation branch and is used for storing braking electric energy subjected to voltage reduction treatment by the current transformation module. The braking energy recovery device provided by the utility model is arranged on the roof of the overhead contact system tramcar, the braking electric energy of the direct current bus is stored in the energy storage module after being subjected to depressurization treatment by the current conversion module, and the electric energy lost in the braking process of the contact system tramcar can be recovered in a region far away from the platform.
Description
Technical Field
The embodiment of the utility model relates to the technical field of braking energy recovery, in particular to a braking energy recovery device and a contact net tramcar
Background
In the running process of the overhead contact system tram, when the overhead contact system tram runs to a downhill area with a large altitude difference such as a viaduct or a downgoing tunnel, a speed limit area crossing a road or a stop-in stop, the speed of the overhead contact system tram is often required to be braked and controlled, the braking process usually adopts a mode that a braking resistor consumes electric braking energy, in the electric braking process, the electric braking energy is not recovered, so that great energy waste is caused, in the prior art, only a few overhead contact system trams are provided with a ground energy recovery device near the stop-in of the tram, and the electric braking energy recovery device for the downhill area far away from the platform and the road crossing area needing speed limit of the overhead contact system tram is still lacking at present.
Disclosure of Invention
The embodiment of the utility model mainly aims to provide a braking energy recovery device which is used for recovering and storing electric braking energy in the electric braking process of a catenary tram.
A first aspect of an embodiment of the present utility model proposes a braking energy recovery device, which is mounted on a roof of a catenary tram, the braking energy recovery device comprising:
the system comprises a current transformation module, a control module and a control module, wherein the current transformation module comprises a first current transformation branch, the input end of the first current transformation branch is connected with a direct current bus of the overhead contact system tram, and the current transformation module is used for carrying out voltage reduction treatment on braking electric energy of the direct current bus of the overhead contact system tram;
the control module is connected with the current transformation module and is used for receiving an action signal of the overhead contact system tramcar and changing the working condition of the current transformation module according to the action signal;
the energy storage module is connected with the output end of the first current transformation branch, and is used for storing braking electric energy processed by the current transformation module.
In some embodiments, the direct current bus of the catenary tram includes a bus positive end and a bus negative end, the first converting branch includes a first switch tube, a second switch tube and a first reactor, the first switch tube is connected in parallel with a first diode, the second switch tube is connected in parallel with a second diode, a collector of the first switch tube is connected with the bus positive end of the catenary tram, an emitter of the second switch tube is connected with the bus negative end of the catenary tram, an emitter of the first switch tube and a collector of the second switch tube are both connected to the first end of the first reactor, a second end of the first reactor is connected with an anode of the energy storage module, a negative electrode of the energy storage module is connected with an emitter of the second switch tube, and a grid of the first switch tube and a grid of the second switch tube are respectively connected with the control module.
In some embodiments, the current transformation module further includes a second current transformation branch, the second current transformation branch and the first current transformation branch are connected in parallel between the dc bus of the overhead contact system tram and the energy storage module, the second current transformation branch includes a third switch tube, a fourth switch tube and a second reactor, the third switch tube is connected in parallel with a third diode, the fourth switch tube and the fourth diode are connected in parallel, a collector electrode of the third switch tube is connected with a positive terminal of the bus of the overhead contact system tram, an emitter electrode of the fourth switch tube is connected with a negative terminal of the bus of the tram, an emitter electrode of the third switch tube and a collector electrode of the fourth switch tube are connected to a first terminal of the second reactor, a second terminal of the second reactor is connected with a positive terminal of the energy storage module, a negative electrode of the energy storage module is connected with an emitter electrode of the fourth switch tube, a grid electrode of the third switch tube and a grid electrode of the fourth switch tube are respectively connected with a control module, and the current transformation branch and the current transformation module output the same waveform value and the phase difference waveform of the first current transformation branch and the second current transformation branch are set.
In some embodiments, the motion signal comprises at least one of a handle motion signal of the catenary tram, an operating speed signal of the catenary tram, and a dc bus voltage signal of the catenary tram.
In some embodiments, the control module is further connected to the energy storage module, and the control module is further configured to detect a remaining power of the energy storage module.
In some embodiments, the braking energy recovery device further includes a temperature control module, the temperature control module includes a plurality of temperature sensors, wherein the plurality of temperature sensors are disposed in one-to-one correspondence with the switching tubes and the energy storage module, and the temperature sensors are used for monitoring a temperature of each switching tube or a temperature of the energy storage module.
In some embodiments, the temperature control module further includes a plurality of liquid cooling branches, the plurality of liquid cooling branches are arranged in one-to-one correspondence with the switching tube and the energy storage module, each liquid cooling branch is provided with a flow control valve, and the flow control valve is used for controlling the flow of the cooling liquid of the corresponding liquid cooling branch according to the monitoring result of the temperature sensor.
In some embodiments, the energy storage module includes at least one of a supercapacitor and a lithium battery.
In some embodiments, the braking energy recovery device further includes a first capacitor and a second capacitor, the first capacitor is disposed between the positive electrode and the negative electrode of the input end of the current transformation module, and the second capacitor is disposed between the positive electrode and the negative electrode of the output end of the current transformation module.
A second aspect of an embodiment of the utility model also proposes a catenary tram comprising a braking energy recovery device according to any one of the embodiments of the first aspect.
The embodiment of the utility model provides a braking energy recovery device and a contact net tram, wherein the braking energy recovery device is arranged on the roof of the contact net tram and comprises: the system comprises a current transformation module, a control module and a control module, wherein the current transformation module comprises a first current transformation branch, the input end of the first current transformation branch is connected with a direct current bus of the overhead contact system tram, and the current transformation module is used for carrying out voltage reduction treatment on braking electric energy of the direct current bus of the overhead contact system tram; the control module is connected with the current transformation module and is used for receiving an action signal of the overhead contact system tramcar and controlling the working condition of the current transformation module according to the action signal; the energy storage module is connected with the output end of the first current transformation branch, and is used for storing braking electric energy processed by the current transformation module. The brake energy recovery device is arranged at the top of the overhead contact system tram, the control module is used for detecting the action signal of the overhead contact system tram, the working condition of the current conversion module is changed according to the action signal, the current conversion module is controlled to work in the braking process, the brake electric energy output by the direct current bus of the overhead contact system tram at the moment is subjected to pressure reduction treatment, and the brake electric energy after the pressure reduction treatment is input to the energy storage module for storage. Therefore, the electric energy lost in the braking process of the overhead contact system tram can be effectively recovered and stored, and the utilization rate of the braking electric energy is improved.
Drawings
FIG. 1 is a schematic view of a braking energy recovery device according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of a current transformation module according to an embodiment of the present utility model;
fig. 3 is a schematic structural diagram of a current transformation module according to an embodiment of the present utility model;
fig. 4 is a schematic view of a braking energy recovery device according to an embodiment of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the embodiments of the present utility model and are not to be construed as limiting the embodiments of the present utility model.
In the description of the embodiments of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience in describing the embodiments of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present utility model.
In the description of the embodiments of the present utility model, several means one or more, and plural means two or more, and greater than, less than, exceeding, etc. are understood to exclude the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the embodiments of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly, and those skilled in the art may reasonably determine the specific meaning of the terms in the embodiments of the present utility model in combination with the specific contents of the technical solutions.
The embodiments described in the embodiments of the present utility model are for more clearly describing the technical solutions of the embodiments of the present utility model, and do not constitute a limitation on the technical solutions provided by the embodiments of the present utility model, and those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present utility model are equally applicable to similar technical problems.
Referring to fig. 1, the present utility model proposes a braking energy recovery device including: the power conversion module comprises a first power conversion branch, the input end of the first power conversion branch is connected with a direct current bus of the overhead contact system tramcar, and the power conversion module is used for carrying out voltage reduction treatment on braking electric energy input by the direct current bus of the overhead contact system tramcar; the control module is connected with the current transformation module and is used for receiving the action signal of the overhead contact system tramcar and changing the working condition of the current transformation module according to the action signal; the energy storage module is connected with the output end of the first current transformation branch and used for storing braking electric energy processed by the current transformation module.
It will be appreciated that in the electric braking process of the overhead contact system tram, the traction motor will work in the engine operating mode and power is transmitted to the dc bus of the overhead contact system tram in the opposite direction through the traction converter, in this embodiment, the braking energy recovery device is mounted on the roof of the overhead contact system tram, and the dc bus of the overhead contact system tram is connected with the input end of the current conversion module, so that even if the overhead contact system tram travels to a region far away from the platform, the braking electric energy generated in the electric braking process of the overhead contact system tram can be recovered.
It can be appreciated that the operating mode of the converter module includes a stop operating mode and a charging operating mode. Specifically, the stop working condition is that when the overhead contact system tramcar normally runs without braking, the current transformation module stops working, and the charging working condition is that in the electric braking process of the overhead contact system tramcar, the braking electric energy input by the direct current bus of the overhead contact system tramcar is subjected to voltage reduction treatment through the current transformation module and then output to the energy storage module. It can be understood that the voltage of the dc bus of the overhead line tram is generally 600V to 900V, and the voltage of the energy storage module is generally configured to 300V to 500V, if the voltage of the dc bus of the overhead line tram is not reduced, the energy storage module is damaged due to the overlarge charging voltage, so that in the embodiment, the energy storage module and the dc bus of the overhead line tram are directly connected to the converter module to reduce the voltage of the braking electric energy input by the dc bus.
In this embodiment, the braking energy recovery device further includes a control module, configured to receive an action signal of the overhead contact system tram in real time, and change a working condition of the current transformation module according to the action signal, specifically, when an electric braking signal of the overhead contact system tram is received, control the current transformation module to work in a charging working condition.
In this embodiment, through set up braking energy recovery unit at the roof of contact net tram, be connected the input of current conversion module with the direct current busbar of contact net tram, the output is connected to energy storage module, therefore, when the electric braking of contact net tram, carry the traction motor to the direct current busbar of contact net tram carry out the step-down processing after storing to energy storage module, through the braking energy recovery unit of this embodiment, even contact net tram is traveling in the region of keeping away from the platform, also can retrieve the braking electric energy of contact net tram.
Referring to fig. 2, in some embodiments, the first converting branch is a buck-boost DC/DC conversion circuit, including a first switching tube Q1, a second switching tube Q2, and a first reactor L1, a DC bus of the catenary tram includes a bus positive terminal and a bus negative terminal, the first switching tube Q1 is connected in parallel with the first diode D1, the second switching tube is connected in parallel with the second diode D2, a collector of the first switching tube Q1 is connected with a bus positive terminal of the catenary tram, an emitter of the second switching tube Q2 is connected with a bus negative terminal of the catenary tram, an emitter of the first switching tube Q1 and a collector of the second switching tube Q2 are both connected to a first end of the first reactor L1, a second end of the first reactor L1 is connected with an anode of the energy storage module, a negative electrode of the energy storage module is connected with an emitter of the second switching tube Q2, and a gate of the first switching tube Q1 and a gate of the second switching tube Q2 are respectively connected with the control module. It can be understood that the conducting directions of the first diode and the second diode are the directions from the emitter to the collector of the switching tube connected in parallel.
It is understood that the switching tube may be an IGBT, a MOS tube, or the like.
It can be understood that after the braking electric energy is subjected to the step-down processing and stored in the energy storage module, the energy storage module can be used as an emergency power supply, when a power supply system of the overhead contact system tram fails, the power supply system supplies power to the overhead contact system tram through the energy storage module, based on the emergency power supply, the first converting branch is set to be a step-up and step-down DC/DC conversion circuit, the converting module can also be used for carrying out the step-up processing on the braking electric energy stored in the energy storage module and feeding back the braking electric energy to the direct current bus of the overhead contact system tram, so that the power supply to the overhead contact system tram is realized through the energy storage module.
It is understood that the current directions of the first diode D1 and the second diode D2 are opposite to the current directions of the first switching transistor Q1 and the second switching transistor Q2, respectively.
The working process of the converter module is described by combining the charging working condition and the discharging working condition:
under the charging condition, the control module outputs a high-level signal to the grid electrode of the first switching tube Q1 to enable the first switching tube Q1 to be conducted, at the moment, the second switching tube Q2 is turned off, the first diode D1 and the second diode D2 are turned off reversely, so that the first reactor L1 and the energy storage module are charged from the direct current bus, and when the first reactor L1 is charged to be close to saturation, the control module stops outputting the high-level signal to the first switching tube Q1 to enable the first switching tube Q1 to be turned off, and therefore power is stopped being supplied to the first reactor and the energy storage module from the direct current bus, at the moment, in the first converting branch, only the second diode D2 is conducted, and power is supplied to the energy storage module through the first reactor L1. It can be understood that, because the first reactor L1 is provided, during charging of the dc bus, the voltage at two sides of the energy storage module is lower than the input voltage of the dc bus, while during charging of the first reactor L1, the voltage at two sides of the energy storage module is equal to the voltage at two sides of the reactor, and the voltage input by the dc bus can be reduced to the level of the input voltage of the energy storage module by controlling the duty ratio of the first switching tube Q1, specifically, the control module can output a PWM signal, and by setting the duty ratio of the PWM signal, the duty ratio of the PWM signal can be determined according to the voltage output power of the catenary that supplies power to the catenary tram and the rated input power of the energy storage module, and the output voltage of the catenary and the input voltage of the energy storage module are generally fixed, so that the duty ratio of the PWM signal can be fixed, and the braking electric energy of the dc bus can be reduced and stored in the energy storage module after the braking electric energy is reduced.
Under the discharging working condition, the control module outputs a high-level signal to the grid electrode of the second switching tube Q2, so that the second switching tube Q2 is conducted, at the moment, the first switching tube Q1 is turned off, the first diode D1 and the second diode D2 are both reversely turned off, the energy storage module charges the first reactor L1, after the first reactor L1 is charged and saturated, power supply to the grid electrode of the second switching tube Q2 is stopped, the second switching tube Q2 is turned off, the energy storage module and the reactor are connected in series, higher voltage is provided, the first diode D1 is conducted, a discharging path is formed, and the voltage feedback from the energy storage module to the direct current bus is realized.
In this embodiment, the converter module is provided with a buck-boost DC/DC conversion circuit, and the control module controls the on and off of the first switching tube Q1 and the second switching tube Q2, so that the buck-boost DC/DC conversion circuit can work under a charging working condition and a discharging working condition according to an action signal of the overhead contact system tramcar, and realizes that braking electric energy input by the direct current bus is recovered after being subjected to buck treatment and stored in the energy storage module, or braking current stored in the energy storage module is fed back to the direct current bus of the overhead contact system tramcar after being subjected to boost treatment as an emergency power supply or an auxiliary power supply.
Referring to fig. 3, in some embodiments, the current transforming module further includes a second current transforming branch, the second current transforming branch is a buck-boost DC/DC conversion circuit, the second current transforming branch is connected in parallel with the first current transforming branch between a DC bus of the catenary tramcar and the energy storage module, the second current transforming branch includes a third switch Q3, a fourth switch Q4 and a second reactor L2, the third switch Q3 is connected in parallel with a third diode D3, the fourth switch and the fourth diode D4 are connected in parallel, a collector of the third switch Q3 is connected with an anode end of the bus of the catenary tramcar, an emitter of the fourth switch Q4 is connected with a cathode end of the bus of the catenary tramcar, an emitter of the third switch Q3 and a collector of the fourth switch Q4 are connected to a first end of the second reactor L2, a second end of the second reactor L2 is connected with an anode of the energy storage module, a cathode of the energy storage module is connected with an emitter of the fourth switch Q4, a phase difference between the grid of the third switch Q3 and the fourth switch Q4 is connected with a control module, and the current transforming branch has the same phase difference waveform value. It can be understood that the working mode of the second current transforming branch is identical to that of the first current transforming branch, because in the working process of the first current transforming branch, after the first reactor L1 is charged and saturated, the first switch tube Q1 is turned off, and the first diode D1 is turned off reversely, and the second diode D2 is turned on, so that the direct current bus of the overhead contact system tramcar is stopped to continuously charge the reactor and the energy storage module, and the reactor is charged to the energy storage module in turn, in order to avoid wasting the braking electric energy in the process, the second current transforming branch which is completely symmetrical to the first current transforming branch is arranged in the embodiment, the control module outputs the same waveforms to the first current transforming branch and the second current transforming branch, but the control signal with the phase difference of a preset value, in particular, the control signal with the phase difference of the preset value is 180 degrees, namely the phase difference of 180 degrees between the PWM signals received by the first current transforming branch and the second current transforming branch, so that the first current transforming branch and the second current transforming branch are different by half period in the working process, the first current transforming branch and the second current transforming branch are staggered to realize the same working condition in the whole braking recovery rate of the overhead contact system in the working process, and further braking recovery rate of the electric energy in the whole braking process is improved.
In some embodiments, the motion signal of the catenary tram may be at least one of a handle motion signal of the catenary tram, a speed signal of the catenary tram, and a dc bus voltage signal of the catenary tram. It can be understood that the control handle of the trolley bus is necessarily dragged in the electric braking process of the trolley bus of the overhead line system, so that corresponding signals are generated, and the control module can judge whether the trolley bus of the overhead line system is braked or not by collecting action signals of the handle, so that whether the converter module needs to work in a charging working condition or not is determined. It can be understood that in order to avoid the wrong starting of the converter module caused by wrong swinging of the handle when the overhead contact system tram is parked, the control module can also collect the speed signal of the overhead contact system tram, and when the speed of the overhead contact system tram is zero, even if the handle action signal indicates the braking of the overhead contact system tram, the working condition of the converter module is not required to be switched into the charging working condition. It can be understood that in order to avoid the situation that the power of the brake energy recovery device is too high in the charging process and the power is directly absorbed from the overhead contact system, so that the power supply voltage of the overhead contact system tram is unstable, the control module is further used for detecting the voltage signal of the direct current bus of the overhead contact system tram and changing the charging power of the current transformation module in real time, thereby ensuring that the voltage of the direct current bus is maintained within the range from 800V to 900V.
In some embodiments, the control module may further enable the current transformation module to work under a discharging working condition according to the action signal, specifically, when the speed signal of the overhead contact system tram is zero and the handle of the overhead contact system tram is dragged to the traction position, a high-level signal is output to the gate of the second switching tube, so that the second switching tube is turned on, and the current transformation module is enabled to work under the discharging working condition and supplies power to the overhead contact system tram through the energy storage module.
In some embodiments, the control module may further control the converter module to operate under a discharging condition after the dc bus voltage signal is continuously collected and is higher than a preset threshold, and the overhead contact system tram is dragged to a turning position by the handle, which may be understood that the situation that the instantaneous power demand is greater, such as a sharp turn, occurs in the running process of the overhead contact system tram, so as to alleviate the situation that the overhead contact system power supply voltage cannot meet the vehicle instantaneous power demand, so that the converter module can operate under the discharging condition, and the energy storage module is used as an auxiliary power source to supply power to the overhead contact system tram together with the overhead contact system, thereby meeting the instantaneous power demand of the tram, so that the upper limit of the power supply voltage of the overhead contact system is not required to be increased to cope with a small amount of high instantaneous power demand, thereby reducing the construction cost of the overhead contact system.
In some embodiments, the control module is further configured to monitor a remaining power of the energy storage module. It is understood that the energy storage module has an upper energy storage limit, so as to avoid damage to the energy storage module caused by overcharging the energy storage module, and the control module is further connected with the energy storage module and is used for monitoring the residual electric quantity of the energy storage module, and after the residual electric quantity is greater than a first threshold value, the current transformation module is switched from a charging working condition to a stopping working condition. It can be appreciated that, in order to avoid the energy storage module from being damaged due to overdischarged, the control module may further switch the converter module from the discharging condition to the stopping condition after detecting that the remaining power of the energy storage module is smaller than the second threshold. Specifically, the control module stops outputting high-level signals to the gate of the first switching tube Q1 and the gate of the second switching tube Q2 under the stop condition, so that both the first switching tube Q1 and the second switching tube Q2 are turned off.
Referring to fig. 3, in some embodiments, the braking energy recovery device further includes a first capacitor C1 and a second capacitor C2, where the first capacitor C1 is disposed between the positive electrode and the negative electrode of the input end of the current transformation module, and the second capacitor C2 is disposed between the positive electrode and the negative electrode of the output end of the current transformation module.
Referring to fig. 3, in some embodiments, braking resistors R1 and R2 are respectively disposed at an input end and an output end of the current transformation module, and it can be understood that, in order to avoid that the voltage of the direct current bus input to the current transformation module is too high, the voltage of the braking electric energy after being reduced is still higher than the voltage interval of the energy storage module, so that the energy storage module is damaged, a part of the braking electric energy is consumed by the braking resistors disposed at the input end and the output end.
Referring to fig. 4, in some embodiments, the braking energy recovery device is further provided with a temperature control module, where the temperature control module includes a plurality of temperature sensors, where the plurality of temperature sensors are disposed in a one-to-one correspondence with each of the switching tubes and the energy storage module in the converter module, and the temperature sensors are used to monitor the temperature of the switching tubes or the energy storage module, where it is understood that the switching tubes generate heat due to switching loss or through-flow loss in the working process, and the devices generate heat, which may cause degradation or even damage of the device performance, and based on this, the temperature of the devices needs to be strictly controlled in the working process of the switching tubes, so in this embodiment, the braking energy recovery device is provided with a plurality of temperature sensors to monitor the temperature of each switching tube in real time, and it is understood that, on this basis, the temperature control module is further provided with a plurality of liquid cooling branches. The liquid cooling branch circuits are arranged in one-to-one correspondence with each switch tube, each liquid cooling branch circuit is provided with a flow control valve, the flow control is used for controlling the flow of cooling liquid in the corresponding liquid cooling branch circuit, the flow control valve can be an electric control valve, a temperature sensor can generate an electric signal with corresponding strength after collecting the temperature of the switch tube or the energy storage module, the electric signal is used as the input of the electric control valve, the opening and closing degree of the flow control valve can be adjusted according to the real-time temperature of the switch tube or the energy storage module, when the temperature of a device rises, the flow control valve is gradually opened, the flow of the cooling liquid in the liquid cooling branch circuit is improved, when the temperature of the device is reduced, the flow control valve is gradually closed, the flow of the cooling liquid in the liquid cooling branch circuit is reduced, and therefore the switch tube and the energy storage module can be kept at proper temperature.
The embodiment of the utility model also provides a contact net tramcar, wherein the roof of the contact net tramcar is provided with the braking energy recovery device.
It will be appreciated by persons skilled in the art that the technical solutions shown in the drawings do not constitute a limitation of the embodiments of the present utility model, and may include more or less components than those illustrated, or may combine certain components, or different components.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
The preferred embodiments of the present utility model have been described above with reference to the accompanying drawings, and are not thereby limiting the scope of the claims of the embodiments of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the embodiments of the present utility model shall fall within the scope of the claims of the embodiments of the present utility model.
Claims (10)
1. A braking energy recovery device, characterized in that the braking energy recovery device is mounted on a roof of a catenary tram, the braking energy recovery device comprising:
the system comprises a current transformation module, a control module and a control module, wherein the current transformation module comprises a first current transformation branch, the input end of the first current transformation branch is connected with a direct current bus of the overhead contact system tram, and the current transformation module is used for carrying out voltage reduction treatment on braking electric energy input by the direct current bus of the overhead contact system tram;
the control module is connected with the current transformation module and is used for receiving an action signal of the overhead contact system tramcar and changing the working condition of the current transformation module according to the action signal;
the energy storage module is connected with the output end of the first current transformation branch, and is used for storing braking electric energy subjected to voltage reduction treatment by the current transformation module.
2. The braking energy recovery apparatus according to claim 1, wherein the dc bus of the catenary tram includes a bus positive terminal and a bus negative terminal, the first converting branch includes a first switching tube, a second switching tube, and a first reactor, the first switching tube is connected in parallel with a first diode, the second switching tube is connected in parallel with a second diode, a collector of the first switching tube is connected with the bus positive terminal, an emitter of the second switching tube is connected with the bus negative terminal, an emitter of the first switching tube and a collector of the second switching tube are both connected to the first end of the first reactor, the second end of the first reactor is connected with the positive terminal of the energy storage module, a negative electrode of the energy storage module is connected with an emitter of the second switching tube, and a gate of the first switching tube and a gate of the second switching tube are respectively connected with the control module.
3. The braking energy recovery device according to claim 1, wherein the current transformation module further comprises a second current transformation branch, the second current transformation branch and the first current transformation branch are connected in parallel between a direct current bus of the overhead contact system tram and the energy storage module, the second current transformation branch comprises a third switch tube, a fourth switch tube and a second reactor, the third switch tube is connected in parallel with a third diode, the fourth switch tube and the fourth diode are connected in parallel, a collector of the third switch tube is connected with a positive terminal of a bus of the overhead contact system tram, an emitter of the fourth switch tube is connected with a negative terminal of the bus of the overhead contact system tram, an emitter of the third switch tube and a collector of the fourth switch tube are connected to a first terminal of the second reactor, a second terminal of the second reactor is connected with a positive terminal of the energy storage module, a negative terminal of the energy storage module is connected with an emitter of the fourth switch tube, a grid of the third switch tube and a grid of the third switch tube are connected with a control branch, and the current transformation branch is different from the first current transformation branch by a preset waveform value.
4. The braking energy recovery apparatus according to claim 1, wherein the operation signal includes at least one of a handle operation signal of the catenary tram, an operation speed signal of the catenary tram, and a dc bus voltage signal of the catenary tram.
5. The braking energy recovery apparatus according to claim 1, wherein the control module is further connected to the energy storage module, and the control module is further configured to detect a remaining amount of the energy storage module.
6. A braking energy recovery device according to claim 2 or claim 3, further comprising a temperature control module comprising a plurality of temperature sensors, wherein the plurality of temperature sensors are provided in one-to-one correspondence with each switching tube and the energy storage module, and the temperature sensors are used for monitoring the temperature of each switching tube or the temperature of the energy storage module.
7. The braking energy recovery device according to claim 6, wherein the temperature control module further comprises a plurality of liquid cooling branches, the plurality of liquid cooling branches are arranged in one-to-one correspondence with each switch tube and the energy storage module, each liquid cooling branch is provided with a flow control valve, and the flow control valve is used for controlling the flow of the cooling liquid of the corresponding liquid cooling branch according to the monitoring result of the temperature sensor.
8. The braking energy recovery device according to claim 1, wherein the energy storage module includes at least one of a super capacitor and a lithium battery pack.
9. The braking energy recovery device according to claim 1, further comprising a first capacitor and a second capacitor, wherein the first capacitor is disposed between the positive pole and the negative pole of the input end of the current transformation module, and the second capacitor is disposed between the positive pole and the negative pole of the output end of the current transformation module.
10. A catenary tram, characterized in that it comprises a braking energy recovery device according to any one of claims 1 to 9.
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| CN202223470863.4U CN219029176U (en) | 2022-12-22 | 2022-12-22 | Braking energy recovery device and overhead contact system tramcar |
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| CN202223470863.4U CN219029176U (en) | 2022-12-22 | 2022-12-22 | Braking energy recovery device and overhead contact system tramcar |
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