CN109193614B - Flywheel energy storage regenerative braking energy feedback system and control method thereof - Google Patents
Flywheel energy storage regenerative braking energy feedback system and control method thereof Download PDFInfo
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- CN109193614B CN109193614B CN201810992512.9A CN201810992512A CN109193614B CN 109193614 B CN109193614 B CN 109193614B CN 201810992512 A CN201810992512 A CN 201810992512A CN 109193614 B CN109193614 B CN 109193614B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
- H02J1/16—Balancing the load in a network using dynamo-electric machines coupled to flywheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
- B60M3/06—Arrangements for consuming regenerative power
Abstract
The invention relates to the technical field of urban rail transit regenerative energy recovery, in particular to a flywheel energy storage regenerative braking energy feedback system and a control method thereof. The system comprises: the direct current-direct current bidirectional converter comprises a direct current-direct current bidirectional converter, a secondary direct current bus and a flywheel energy storage device. The flywheel energy storage regenerative braking energy feedback system comprises two stages of power conversion equipment, wherein the first stage is a direct current-direct current bidirectional converter, the second stage is a direct current-alternating current bidirectional converter in the flywheel energy storage device, and a second-stage direct current bus is arranged between the two stages of power conversion equipment, so that the system compatibility is improved; according to the control method, the direct current-direct current bidirectional converter and the flywheel energy storage device respectively and independently adjust the operation state according to respective control strategies, communication is not needed between the direct current-direct current bidirectional converter and the direct current-alternating current bidirectional converter in each flywheel energy storage device, mutual decoupling is achieved in control, system complexity is reduced, good expandability is achieved, and construction and operation and maintenance are facilitated.
Description
Technical Field
The invention relates to the technical field of urban rail transit regenerative energy recovery, in particular to a flywheel energy storage regenerative braking energy feedback system and a control method thereof.
Background
Urban rail transit has the advantages of large traffic volume, high running speed, good comfort and the like, and is more and more widely applied in various countries in the world. People are more and more concerned about energy conservation and environmental protection of rail transit while enjoying the comfort and convenience of rail transit. The urban rail train generates considerable regenerative braking energy in the frequent braking process because of short distance between stations and high running density. The regenerative braking energy flows into the direct current traction network except for a part of the regenerative braking energy absorbed by adjacent vehicles, if the regenerative braking energy cannot be absorbed, the direct current bus voltage is increased, the normal operation of the system is affected due to the overhigh voltage, and therefore, an energy absorption device needs to be configured to absorb the regenerative braking energy. The conventional equipment for absorbing regenerative braking energy comprises a resistance energy consumption device, a flywheel energy storage device, a super capacitor energy storage device and an inversion feedback device. The flywheel energy storage device can absorb energy when the train is braked and release energy when the train is started and accelerated, so that the energy-saving effect is good, and the flywheel energy storage device is safe, reliable, long in service life, green and environment-friendly and is a new technical development direction.
The direct current supply voltage of urban rail transit of all countries in the world is mostly between DC 600V and 1500V. The power supply voltage of the rail transit traction network in China mainly comprises two systems: one system is rated at 750V DC, and the other system is rated at 1500V DC. For a rail transit system with 750V direct-current power supply voltage, a flywheel energy storage device converts the voltage to 750V direct-current power supply voltage through an AC/DC converter and is connected to a 750V direct-current traction network, and the flywheel energy storage device has been successfully operated. However, for a track traffic system with a supply voltage of 1500V, the related research results of how the flywheel energy storage device performs power conversion and charge-discharge control are few.
The energy feedback system of the flywheel energy storage device in the prior art is used for the flywheel energy storage device of a 750V direct current rail system, the rated voltage of the direct current side of a DC/AC bidirectional converter is 750V, and the flywheel energy storage device cannot be connected to the 1500V direct current rail system. If a DC/AC bidirectional converter with the direct-current voltage of 1500V is configured for each flywheel energy storage device, the converter is complex in structure and high in cost.
In view of the above, it is an urgent technical problem in the art to provide a new flywheel energy storage regenerative braking energy feedback system to overcome the above drawbacks in the prior art.
Disclosure of Invention
The invention aims to provide a flywheel energy storage regenerative braking energy feedback system and a control method thereof, aiming at the defects in the prior art.
The invention provides a flywheel energy storage regenerative braking energy feedback system, which is arranged on a traction network for outputting electric energy to supply power to a train, and comprises:
the direct current-direct current bidirectional converter is connected with a direct current bus of the traction network on the high-voltage side;
the secondary direct-current bus is connected with the low-voltage side of the direct-current-direct-current bidirectional converter; and
at least one flywheel energy storage device connected with the secondary DC bus, the flywheel energy storage device comprising: the direct current-alternating current bidirectional converter is connected with the secondary direct current bus at the direct current side, and the flywheel energy storage unit is connected with the alternating current side of the direct current-alternating current bidirectional converter;
the direct current-direct current bidirectional converter adjusts the operation state according to the direct current bus voltage, and the flywheel energy storage device adjusts the operation state according to the secondary direct current bus voltage.
Preferably, the rated voltage of the direct current bus is 1500V, and the rated voltage of the secondary direct current bus is 750V.
Preferably, the system further comprises:
the first voltage sensor is used for detecting the voltage of the direct current bus;
and the first controller is connected with the first voltage sensor and the direct current-direct current bidirectional converter, and controls the running state of the direct current-direct current bidirectional converter according to the detection result of the first voltage sensor.
Preferably, the flywheel energy storage device further comprises:
the second voltage sensor is used for detecting the voltage of the secondary direct current bus;
and the second controller is connected with the second voltage sensor, the direct current-alternating current bidirectional converter and the flywheel energy storage unit, and controls the running state of the direct current-alternating current bidirectional converter and the running state of the flywheel energy storage unit according to the detection result of the second voltage sensor.
Preferably, the flywheel energy storage unit comprises:
a flywheel body for storing kinetic energy;
and the stator end of the motor is connected with the alternating current side of the direct current-alternating current bidirectional converter.
The invention also provides a control method of the flywheel energy storage regenerative braking energy feedback system, which comprises the following steps:
respectively detecting the direct current bus voltage and the secondary direct current bus voltage;
controlling the running state of the DC-DC bidirectional converter according to the DC bus voltage;
and controlling the running state of the flywheel energy storage device according to the voltage of the secondary direct current bus.
Preferably, the step of controlling the operation state of the dc-dc bidirectional converter according to the dc bus voltage includes:
when the voltage of the direct current bus is larger than or equal to a first charging threshold value, controlling the power flow direction of the direct current-direct current bidirectional converter to flow from a high-voltage side to a low-voltage side; and when the voltage of the direct current bus is smaller than or equal to a first discharge threshold value, controlling the power flow direction of the direct current-direct current bidirectional converter to flow from a low-voltage side to a high-voltage side.
Preferably, the step of "controlling the operation state of the flywheel energy storage device according to the voltage of the secondary dc bus" includes:
when the voltage of the secondary direct-current bus is greater than or equal to a second charging threshold value, controlling the power flow direction of the direct-current-alternating-current bidirectional converter to flow from a direct-current side to an alternating-current side, controlling the working mode of the motor to be a motor mode, driving the flywheel body to rotate, and converting electric energy into kinetic energy;
when the voltage of the secondary direct current bus is smaller than or equal to a second discharge threshold value, the power flow direction of the direct current-alternating current bidirectional converter is controlled to flow from the alternating current side to the direct current side, the working mode of the motor is controlled to be a generator mode, and the inertia of the flywheel body drives a generator rotor to rotate so as to convert kinetic energy into electric energy.
Preferably, the step of controlling the operation state of the dc-dc bidirectional converter according to the dc bus voltage further includes:
and when the direct current bus voltage is greater than a first discharging threshold value and smaller than a first charging threshold value, controlling the direct current-direct current bidirectional converter to stop power conversion.
Preferably, the step of "controlling the operation state of the flywheel energy storage device according to the voltage of the secondary dc bus" further includes:
and when the voltage of the secondary direct current bus is greater than a second discharging threshold and smaller than a second charging threshold, controlling the direct current-alternating current bidirectional converter to stop power conversion, and controlling the flywheel energy storage device to enter a standby state.
The flywheel energy storage regenerative braking energy feedback system comprises two stages of power conversion equipment, wherein the first stage is a direct current-direct current bidirectional converter, the second stage is a direct current-alternating current bidirectional converter in the flywheel energy storage device, and a second-stage direct current bus is arranged between the two stages of power conversion equipment, so that the system compatibility is improved; according to the control method, the direct current-direct current bidirectional converter and the flywheel energy storage device respectively and independently adjust the operation state according to respective control strategies, communication is not needed between the direct current-direct current bidirectional converter and the direct current-alternating current bidirectional converter in each flywheel energy storage device, mutual decoupling is achieved in control, system complexity is reduced, good expandability is achieved, and construction and operation and maintenance are facilitated.
Drawings
FIG. 1 is a block diagram of a flywheel energy storage regenerative braking energy feedback system according to an embodiment of the present invention.
Fig. 2 is a block diagram of a flywheel energy storage regenerative braking energy feedback system according to a preferred embodiment of the present invention.
Fig. 3 is a control flowchart of the dc-dc bidirectional converter in the control method according to the embodiment of the present invention.
Fig. 4 is a control flowchart of the flywheel energy storage device in the control method according to the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to make the description of the present disclosure more complete and complete, the following description is given for illustrative purposes with respect to the embodiments and examples of the present invention; it is not intended to be the only form in which the embodiments of the invention may be practiced or utilized. The embodiments are intended to cover the features of the various embodiments as well as the method steps and sequences for constructing and operating the embodiments. However, other embodiments may be utilized to achieve the same or equivalent functions and step sequences.
Referring to fig. 1, a transformer 300 and an ac-dc rectifier 400 are sequentially disposed between an ac bus 100 of the power supply network and a dc bus 200 of the traction network, one side of the transformer 300 is connected to the ac bus 100, an ac side of the ac-dc rectifier 400 is connected to the other side of the transformer 300, a dc side of the ac-dc rectifier 400 is connected to the dc bus 200, and the electric energy output by the power supply network via the ac bus 100 is converted by the transformer 300 and the ac-dc rectifier 400 and then is adapted to the dc bus 200 of the traction network.
The flywheel energy storage regenerative braking energy feedback system 500 of the embodiment of the invention is arranged on the direct current bus 200 of the traction network, and the flywheel energy storage regenerative braking energy feedback system 500 comprises: the direct current-direct current bidirectional converter 10, the flywheel energy storage device 20 and the secondary direct current bus 30, wherein the high-voltage side of the direct current-direct current bidirectional converter 10 is connected with the direct current bus 200, the low-voltage side of the direct current-direct current bidirectional converter 10 is connected with the secondary direct current bus 30, and the electric energy transmitted to the flywheel energy storage regenerative braking energy feedback system 500 by the direct current bus 200 is converted by the direct current-direct current bidirectional converter 10 and then is matched with the secondary direct current bus 30.
The flywheel energy storage device 20 is arranged on the secondary direct current bus 30 and is used for converting regenerative energy generated during train braking into kinetic energy to be stored or converting the stored kinetic energy into electric energy to be released for the train to use. Flywheel energy storage device 20 includes: the direct current-alternating current bidirectional converter 201 and the flywheel energy storage unit 202, wherein the alternating current side of the direct current-alternating current bidirectional converter 201 is connected with the flywheel energy storage unit 202 and used for providing charging power for the flywheel energy storage unit 202 and receiving the output power of the flywheel energy storage unit 202.
When a train is braked, the voltage of the direct current bus 200 is increased, when the voltage of the direct current bus 200 is greater than or equal to a first charging threshold value, the power flow direction of the direct current-direct current bidirectional converter 10 is from a high-voltage side to a low-voltage side, namely, the power of the direct current-direct current bidirectional converter 10 flows from the direct current bus 200 to the secondary direct current bus 30, the voltage of the secondary direct current bus 30 is increased, when the voltage of the secondary direct current bus 30 is greater than or equal to a second charging threshold value, the power flow direction of the direct current-alternating current bidirectional converter 201 is from a direct current side to an alternating current side, namely, the direct current-alternating current bidirectional converter 201 controls the power to flow from the secondary direct current bus 30 to the flywheel energy storage unit 202, and the regenerated energy is stored in the form.
When the train is started or accelerated, the voltage of the direct current bus 200 is reduced, when the voltage of the direct current bus 200 is smaller than or equal to a first discharge threshold value, the power flow direction of the direct current-direct current bidirectional converter 10 is from a low-voltage side to a high-voltage side, namely, the power of the direct current-direct current bidirectional converter 10 flows from the secondary direct current bus 30 to the direct current bus 200, the voltage of the secondary direct current bus 30 is reduced, when the voltage of the secondary direct current bus 30 is smaller than or equal to a second discharge threshold value, the power flow direction of the direct current-alternating current bidirectional converter 201 is from an alternating current side to a direct current side, namely, the direct current-alternating current bidirectional converter 201 controls the power to flow from the flywheel energy storage unit 202 to the secondary direct current bus 30, and stored kinetic energy is converted into electric energy to be released.
The dc-dc bidirectional converter 10 adjusts the power conversion direction and the power according to the voltage variation of the dc bus 200, so that the voltage of the dc bus 200 is stabilized within a set value range. The dc-ac bidirectional converter 201 adjusts the power conversion direction and power according to the voltage variation of the secondary dc bus 30, so that the voltage of the secondary dc bus 30 is stabilized within a set value range.
In the flywheel energy storage regenerative braking energy feedback system 500 of the present invention, a plurality of flywheel energy storage devices 20 may be connected in parallel to the secondary dc bus 30, and the number of flywheel energy storage devices 20 may be configured according to the demand of charging and discharging power and energy, and when one of the flywheel energy storage devices quits operation, the operation of the whole system 500 is not affected, but the charging and discharging power and energy are reduced.
In one embodiment, the rated voltage of the dc bus 200 is 1500V and the rated voltage of the secondary dc bus 30 is 750V.
The invention adopts a topology structure of two-stage power conversion, the flywheel energy storage regenerative braking energy feedback system 500 comprises two stages of power conversion equipment, the first stage is a direct current-direct current bidirectional converter 10, the second stage is a direct current-alternating current bidirectional converter 201 in the flywheel energy storage device 20, a two-stage direct current bus 30 is arranged between the two stages of power conversion equipment, and the system compatibility is improved. Wherein, the dc-dc bidirectional converter 10 adjusts the operation status according to the voltage of the dc bus 200, and the flywheel energy storage device 20 adjusts the operation status according to the voltage of the secondary dc bus 30. In the flywheel energy storage regenerative braking energy feedback system 500, the direct current-direct current bidirectional converter 10 and each direct current-alternating current bidirectional converter 201 do not need to be communicated, and the direct current-alternating current bidirectional converters 201 do not need to be communicated.
Specifically, in a preferred embodiment, please refer to fig. 2, the flywheel energy storage regenerative braking energy feedback system 500 further includes a first voltage sensor and a first controller, wherein the first voltage sensor is connected to the dc bus 200 and is configured to detect a voltage of the dc bus 200; a first controller is connected to both the first voltage sensor and the dc-dc bidirectional converter 10, and the first controller controls the operation state of the dc-dc bidirectional converter 10 according to the detection result of the first voltage sensor. The flywheel energy storage device 20 further includes a second voltage sensor and a second controller, wherein the second voltage sensor is connected to the second-stage dc bus 30 and is configured to detect a voltage of the second-stage dc bus 30, the second controller is connected to the second voltage sensor, the dc-ac bidirectional converter 201, and the flywheel energy storage unit 202, and the second controller controls an operation state of the dc-ac bidirectional converter 201 and an operation state of the flywheel energy storage unit 202 according to a detection result of the second voltage sensor.
Further, the first controller and the second controller each include a programmable processor having a software program written therein that can perform the functions described herein. Specifically, the software program may be downloaded to the processor in an electronic format via a network; alternatively, the software program may be stored on a storage medium such as magnetic, optical or electronic memory. In some embodiments, the first controller and the second controller may also include additional or embedded hardware modules for accelerating their operation. The aforementioned hardware modules may include discrete components, at least one Field Programmable Gate Array (FPGA), and/or at least one application specific integrated circuit (ASI C).
When the voltage of the dc bus 200 is greater than or equal to the first charging threshold, the first controller controls the power flow direction of the dc-dc bidirectional converter 10 to flow from the high-voltage side to the low-voltage side; when the dc bus voltage 200 is less than or equal to the first discharging threshold, the first controller controls the power flow direction of the dc-dc bidirectional converter 10 to flow from the low voltage side to the high voltage side; and when the voltage of the direct current bus 200 is greater than a first discharging threshold value and smaller than a first charging threshold value, controlling the direct current-direct current bidirectional converter 10 to stop power conversion.
In a preferred embodiment, referring to fig. 2, the flywheel energy storage unit 202 comprises: the electric machine 2021 and the flywheel body 2022, wherein the electric machine 2021 is an integrated motor/generator, and the flywheel energy storage unit 202 is used as a motor when charged and used as a generator when discharged. During charging, the motor 2021 obtains the output power of the dc-ac bidirectional converter 201 to drive the flywheel body 2022 to rotate, the flywheel body 2022 is used for storing kinetic energy, during discharging, the flywheel body 2022 transmits the stored kinetic energy to the motor 2021, the electrical output end of the motor 2021 is connected to the ac side of the dc-ac bidirectional converter 201, and the electrical energy converted from the kinetic energy is transmitted to the secondary dc bus 30. The ac side of the dc-ac bi-directional converter 201 is connected to the stator of the motor 2021 and is a variable frequency ac voltage.
It should be understood by those skilled in the art that the focus of the present invention is not on the structure of the flywheel energy storage unit 202, and the flywheel energy storage unit 202 may also be implemented in other ways, and all of them are within the protection scope of the present invention.
Flywheel energy storage device 20 has a charged state, a discharged state, and a standby state (a state in which it is neither charged nor discharged).
When the voltage of the secondary dc bus 30 is greater than or equal to the second charging threshold, the second controller controls the power flow direction of the dc-ac bidirectional converter 201 to flow from the dc side to the ac side, controls the motor 2021 to operate in the motor mode, drives the flywheel body 2022 to rotate, converts the electric energy into the kinetic energy, and sets the flywheel energy storage device 20 in the charging state.
When the voltage of the secondary dc bus 30 is less than or equal to the second discharge threshold, the second controller controls the power flow direction of the dc-ac bidirectional converter 201 to flow from the ac side to the dc side, controls the operation mode of the motor 2021 to be the generator mode, and controls the inertia of the flywheel body 2022 to drive the generator rotor to rotate, thereby converting the kinetic energy into the electric energy, and the flywheel energy storage device 20 is in the discharge state.
When the voltage of the secondary dc bus 30 is greater than the second discharging threshold and less than the second charging threshold, the first controller controls the dc-ac bidirectional converter 201 to stop power conversion, and controls the flywheel energy storage device 20 to enter a standby state. When the flywheel energy storage device 20 enters the standby state, the flywheel body 2022 will continue to rotate at the current rotation speed by its inertia without considering energy loss.
The invention also provides a control method of the flywheel energy storage regenerative braking energy feedback system 500, which comprises the following steps:
and S101, respectively detecting the direct current bus voltage and the secondary direct current bus voltage.
And S102, controlling the running state of the direct current-direct current bidirectional converter according to the direct current bus voltage, and controlling the running state of the flywheel energy storage device according to the secondary direct current bus voltage.
According to the control method, the direct current-direct current bidirectional converter 10 and the flywheel energy storage devices 20 respectively and independently adjust the operation states according to respective control strategies, communication is not needed between the direct current-direct current bidirectional converter 10 and the direct current-alternating current bidirectional converter 201 in each flywheel energy storage device 20, mutual decoupling is achieved in control, system complexity is reduced, good expandability is achieved, and construction and operation and maintenance are facilitated.
Fig. 3 is a control flow of the dc-dc bidirectional converter in the control method of the flywheel energy storage regenerative braking energy feedback system 500 according to the embodiment of the invention, and a flow chart is shown in fig. 3, starting from the detection step S301, detecting the dc bus voltage. In the determination step S302, when it is detected that the dc bus voltage is greater than or equal to the first charging threshold, the power flow of the dc-dc bidirectional converter is controlled to flow from the high voltage side to the low voltage side.
In the determination step S302, when it is detected that the dc bus voltage is smaller than the first charging threshold, the process proceeds to a determination step 304. In the step 304, when the dc bus voltage is detected to be less than or equal to the first discharging threshold, the power flow of the dc-dc bidirectional converter is controlled from the low voltage side to the high voltage side. In the decision step 304, when it is detected that the dc bus voltage is greater than the first discharging threshold, the dc-dc bidirectional converter is controlled to stop power conversion.
Fig. 4 is a control flow of the flywheel energy storage device 20 in the control method of the flywheel energy storage regenerative braking energy feedback system 500 according to the embodiment of the invention, and a flow chart is shown in fig. 4, which can support one or more of the following four control modes included in the described control method:
(a) and (3) charging mode: the power flow direction of the direct current-direct current bidirectional converter is controlled to flow from a high-voltage side to a low-voltage side, the power flow direction of the direct current-alternating current bidirectional converter is controlled to flow from a direct current side to an alternating current side, the working mode of the motor is controlled to be a motor mode, the flywheel body is driven to rotate, electric energy is converted into kinetic energy, and the power of the direct current-alternating current bidirectional converter is not more than the rated charging power of the flywheel energy storage device.
(b) Standby mode: and controlling the direct current-alternating current bidirectional converter to stop power conversion and controlling the flywheel energy storage device to enter a standby state.
(c) A discharging mode: the power flow direction of the direct current-alternating current bidirectional converter is controlled to flow from the alternating current side to the direct current side, the working mode of the motor is controlled to be a generator mode, the inertia of the flywheel body drives a generator rotor to rotate, kinetic energy is converted into electric energy, and the power of the direct current-alternating current bidirectional converter is not more than the rated discharge power of the flywheel energy storage device.
The method shown in fig. 4 begins with a detection step S401, in which a secondary dc bus voltage is detected in a monitoring step S401. In the determination step S402, when it is detected that the secondary dc bus voltage is greater than or equal to the second charging threshold, the flywheel energy storage device 20 enters the charging mode.
In the determination step S402, when it is detected that the secondary dc bus voltage is smaller than the second charging threshold, the process proceeds to a determination step 404. In decision step 404, when it is detected that the secondary dc bus voltage is less than or equal to the second discharging threshold, flywheel energy storage device 20 enters a discharging mode. In decision step 404, when it is detected that the secondary dc bus voltage is greater than the second discharging threshold, the flywheel energy storage device 20 is not charged or discharged, and the flywheel energy storage device 20 enters the standby mode.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a flywheel energy storage regenerative braking energy feedback system, locates and is used for exporting the electric energy to supply power for the traction network of train, its characterized in that, this system includes:
the direct current-direct current bidirectional converter is connected with a direct current bus of the traction network on the high-voltage side;
the secondary direct-current bus is connected with the low-voltage side of the direct-current-direct-current bidirectional converter; and
at least one flywheel energy storage device connected with the secondary DC bus, the flywheel energy storage device comprising: the direct current-alternating current bidirectional converter is connected with the secondary direct current bus at the direct current side, and the flywheel energy storage unit is connected with the alternating current side of the direct current-alternating current bidirectional converter;
the first voltage sensor is used for detecting the voltage of the direct current bus;
the first controller is connected with the first voltage sensor and the direct current-direct current bidirectional converter, and controls the running state of the direct current-direct current bidirectional converter according to the detection result of the first voltage sensor;
the flywheel energy storage device further comprises:
the second voltage sensor is used for detecting the voltage of the secondary direct current bus;
the second controller is connected with the second voltage sensor, the direct current-alternating current bidirectional converter and the flywheel energy storage unit, and controls the running state of the direct current-alternating current bidirectional converter and the running state of the flywheel energy storage unit according to the detection result of the second voltage sensor;
when the direct-current bus voltage is greater than or equal to a first charging threshold value, the first controller controls the power flow direction of the direct-current-direct-current bidirectional converter to flow from a high-voltage side to a low-voltage side; when the direct-current bus voltage is smaller than or equal to a first discharge threshold value, the first controller controls the power flow direction of the direct-current-direct-current bidirectional converter to be from a low-voltage side to a high-voltage side;
when the voltage of the secondary direct-current bus is greater than or equal to a second charging threshold value, the second controller controls the power flow direction of the direct-current-alternating-current bidirectional converter to flow from a direct-current side to an alternating-current side, controls the working mode of the motor to be a motor mode, drives the flywheel body to rotate, and converts electric energy into kinetic energy;
when the voltage of the secondary direct current bus is smaller than or equal to a second discharge threshold value, the second controller controls the power flow direction of the direct current-alternating current bidirectional converter to flow from the alternating current side to the direct current side, the second controller controls the working mode of the motor to be a generator mode, and inertia of the flywheel body drives a generator rotor to rotate so as to convert kinetic energy into electric energy.
2. The flywheel energy storage regenerative braking energy feedback system of claim 1, wherein the rated voltage of the dc bus is 1500V and the rated voltage of the secondary dc bus is 750V.
3. The flywheel energy storage regenerative braking energy feedback system of claim 1, wherein the flywheel energy storage unit comprises:
a flywheel body for storing kinetic energy;
and the stator end of the motor is connected with the alternating current side of the direct current-alternating current bidirectional converter.
4. A control method for a flywheel energy storage regenerative braking energy feedback system based on claim 1, wherein the control method comprises:
respectively detecting the direct current bus voltage and the secondary direct current bus voltage;
when the voltage of the direct current bus is larger than or equal to a first charging threshold value, controlling the power flow direction of the direct current-direct current bidirectional converter to flow from a high-voltage side to a low-voltage side; when the voltage of the direct current bus is smaller than or equal to a first discharge threshold value, controlling the power flow direction of the direct current-direct current bidirectional converter to flow from a low-voltage side to a high-voltage side;
when the voltage of the secondary direct-current bus is greater than or equal to a second charging threshold value, controlling the power flow direction of the direct-current-alternating-current bidirectional converter to flow from a direct-current side to an alternating-current side, controlling the working mode of the motor to be a motor mode, driving the flywheel body to rotate, and converting electric energy into kinetic energy;
when the voltage of the secondary direct current bus is smaller than or equal to a second discharge threshold value, the power flow direction of the direct current-alternating current bidirectional converter is controlled to flow from the alternating current side to the direct current side, the working mode of the motor is controlled to be a generator mode, and the inertia of the flywheel body drives a generator rotor to rotate so as to convert kinetic energy into electric energy.
5. The control method according to claim 4, wherein the step of controlling the operation state of the DC-DC bidirectional converter according to the DC bus voltage further comprises:
and when the direct current bus voltage is greater than a first discharging threshold value and smaller than a first charging threshold value, controlling the direct current-direct current bidirectional converter to stop power conversion.
6. The control method according to claim 4, wherein the step of controlling the operation state of the flywheel energy storage device according to the secondary DC bus voltage further comprises:
and when the voltage of the secondary direct current bus is greater than a second discharging threshold and smaller than a second charging threshold, controlling the direct current-alternating current bidirectional converter to stop power conversion, and controlling the flywheel energy storage device to enter a standby state.
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| CN110011470B (en) * | 2019-05-09 | 2023-04-07 | 湖南大学 | Eighteen-phase energy storage motor system for urban rail transit and control method thereof |
| CN110867888B (en) * | 2019-10-22 | 2021-01-12 | 中国科学院电工研究所 | Pulse power supply system based on generator cluster and energy storage microgrid and discharging method |
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| JP5914989B2 (en) * | 2011-05-30 | 2016-05-11 | サンケン電気株式会社 | Switching power supply |
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| CN106505552B (en) * | 2016-11-10 | 2019-01-04 | 太原理工大学 | A kind of double-deck bus direct-current grid and its control method based on power pond |
| CN107953803B (en) * | 2017-12-25 | 2023-04-18 | 西南交通大学 | Medium-voltage flexible direct-current traction power supply system and control method thereof |
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