CN110034556B - Regenerative braking energy recovery control method, system and device - Google Patents
Regenerative braking energy recovery control method, system and device Download PDFInfo
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- CN110034556B CN110034556B CN201910240749.6A CN201910240749A CN110034556B CN 110034556 B CN110034556 B CN 110034556B CN 201910240749 A CN201910240749 A CN 201910240749A CN 110034556 B CN110034556 B CN 110034556B
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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
- H02J1/10—Parallel operation of dc sources
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
Abstract
The invention discloses a regenerative braking energy recovery control method, a system and a device, wherein the method comprises the following steps: acquiring the direct-current voltage of a direct-current bus of a direct-current traction network in real time, the direct-current side branch current of each rectifier for supplying power to the direct-current bus, and calculating to obtain the total direct-current side current according to all the direct-current side branch currents; comparing the direct current voltage with a preset voltage threshold value to obtain a voltage comparison result, and comparing the total current of the direct current side with a preset current threshold value to obtain a current comparison result; and performing an energy absorption operation or an energy release operation according to the voltage comparison result and the current comparison result. According to the invention, through a double judgment mechanism of the direct-current voltage and the direct-current side total current, the accuracy and the reliability of the regenerative braking energy recovery system are improved.
Description
Technical Field
The invention relates to the technical field of regenerative braking energy recovery, in particular to a regenerative braking energy recovery control method, system and device.
Background
Urban rail transit vehicles generally adopt a variable frequency variable voltage (VVVF) speed regulation mode, and generate a large amount of regenerative braking energy during electric braking. Except for part of the regenerative braking energy absorbed by adjacent vehicles, other regenerative braking energy flows into the direct current traction network, if the regenerative braking energy cannot absorb the energy, the direct current bus voltage is increased, and the normal operation of the rail transit system is affected due to the fact that the direct current bus voltage is too high. The traditional method is that redundant regenerative braking energy is consumed through a vehicle-mounted resistor or a ground resistor, and the method wastes energy in vain, is not energy-saving and environment-friendly. Therefore, the introduction of a regenerative braking energy recovery system to absorb and recycle the regenerative braking energy is a requirement and development direction for building an energy-saving society in the future.
The existing regenerative braking energy recovery system generally monitors direct current bus voltage parameters of a traction network in real time, judges the operation condition of the rail locomotive through the fluctuation of the direct current bus voltage, and further adopts an energy absorption or energy release strategy to keep the basic stability of the direct current bus voltage. Because the urban rail traction network is a multi-power-supply coupling system, the fluctuation of the direct-current bus voltage of the traction network is not only influenced by the running condition of the rail locomotive, but also influenced by other factors such as the voltage fluctuation of a medium-voltage alternating-current power supply network and the like, the judgment that the direct-current bus voltage of the traction network is used as the regenerative braking energy recovery is not reliable, and misoperation is easy to occur. Therefore, how to accurately identify the operation condition of the rail locomotive and further adopt a corresponding regenerative braking energy absorption and release control strategy is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a regenerative braking energy recovery control method, a regenerative braking energy recovery control system and a regenerative braking energy recovery control device, and aims to solve the technical problems of poor reliability, low accuracy and the like of the conventional regenerative braking energy recovery control method.
In order to solve the above problem, the present invention provides a regenerative braking energy recovery control method, including:
acquiring the direct-current voltage of a direct-current bus of a direct-current traction network in real time, the direct-current side branch current of each rectifier for supplying power to the direct-current bus, and calculating to obtain the total direct-current side current according to all the direct-current side branch currents;
comparing the direct current voltage with a preset voltage threshold value to obtain a voltage comparison result, and comparing the total current of the direct current side with a preset current threshold value to obtain a current comparison result;
and performing an energy absorption operation or an energy release operation according to the voltage comparison result and the current comparison result.
As a further improvement of the present invention, the step of performing the energy absorbing operation or the energy discharging operation based on the voltage comparison result and the current comparison result includes:
when the direct current voltage is greater than a preset voltage threshold value and the total current of the direct current side is less than a preset current threshold value, performing energy absorption operation;
and when the direct current voltage is smaller than the preset voltage threshold and the total current of the direct current side is larger than the preset current threshold, performing energy release operation.
As a further improvement of the present invention, the preset voltage threshold is a system default value or a voltage set value input by a user is received; the preset current threshold is a system default value or a current set value input by a user is received.
In order to solve the above problems, the present invention provides a regenerative braking energy recovery system, including:
the real-time acquisition module is used for acquiring the direct-current voltage of a direct-current bus of the direct-current traction network, the direct-current side branch current of each rectifier for supplying power to the direct-current bus and calculating to obtain the total direct-current side current according to all the direct-current side branch currents;
the comparison module is used for comparing the direct current voltage with a preset voltage threshold value to obtain a voltage comparison result, and comparing the total current of the direct current side with a preset current threshold value to obtain a current comparison result;
and the processing module is used for performing energy absorption operation or energy release operation according to the voltage comparison result and the current comparison result.
As a further improvement of the invention, the processing module comprises:
the energy absorption processing unit is used for performing energy absorption operation when the direct-current voltage is greater than a preset voltage threshold and the total direct-current side current is less than a preset current threshold;
and the energy release processing unit is used for performing energy release operation when the direct current voltage is smaller than a preset voltage threshold and the total current of the direct current side is larger than a preset current threshold.
As a further improvement of the present invention, the preset voltage threshold is a system default value or a voltage set value input by a user is received; the preset current threshold is a system default value or a current set value input by a user is received.
In order to solve the above problems, the present invention provides a regenerative braking energy recovery device, including:
the regenerative braking energy recovery system comprises a voltage acquisition end and a current acquisition end;
the direct current bus is connected with the regenerative braking energy recovery system, and the voltage acquisition end is connected with the direct current bus;
the rectifier assembly comprises a plurality of rectifiers, each rectifier is connected with a direct current bus, and a current acquisition end is connected with a sensor on the direct current side of each rectifier;
a transformer, one end of which is connected with the alternating current side of the rectifier;
and the alternating current bus is connected with the other end of the transformer.
As a further improvement of the invention, the regenerative braking energy recovery system comprises an energy storage type regenerative braking energy recovery system and an inverter type regenerative braking energy recovery system.
As a further improvement of the invention, the regenerative braking energy recovery system is an inverter type regenerative braking energy recovery system, the direct current side of the inverter type regenerative braking energy recovery system is connected with the direct current bus of the traction network, and the alternating current side of the inverter type regenerative braking energy recovery system is connected with the alternating current power supply system of the traction substation.
As a further improvement of the invention, the energy storage type regenerative braking energy recovery system comprises a flywheel energy storage type regenerative braking energy recovery system, a super-capacitor energy storage type regenerative braking energy recovery system and an electrochemical battery energy storage type regenerative braking energy recovery system.
Compared with the prior art, the method and the device have the advantages that the direct-current voltage and the direct-current side total current of the direct-current bus are collected in real time, and the energy absorption operation or the energy release operation is carried out according to the voltage comparison result of the direct-current voltage and the preset voltage threshold and the current comparison result of the direct-current side total current and the preset current threshold, so that the accuracy and the reliability of the regenerative braking energy recovery system are improved through the double judgment mechanism of the direct-current voltage and the direct-current side total current.
Drawings
FIG. 1 is a schematic flow chart illustrating a regenerative braking energy recovery control method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating an embodiment of a process flow in the regenerative braking energy recovery control method according to the present invention;
FIG. 3 is a functional block diagram of an embodiment of a regenerative braking energy recovery system of the present invention;
FIG. 4 is a functional block diagram of an embodiment of a processing module in the regenerative braking energy recovery system of the present invention;
FIG. 5 is a schematic diagram of a frame structure of an embodiment of the regenerative braking energy recovery apparatus of the present invention;
FIG. 6 is a schematic structural diagram of a frame of another embodiment of the regenerative braking energy recovery device according to the present invention.
Detailed Description
The technical solutions in the embodiments will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, wherein like reference numerals represent like elements in the drawings. It is apparent that the embodiments to be described below are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
1-2 illustrate one embodiment of a regenerative braking energy recovery control method of the present invention. In the present embodiment, as shown in fig. 1, the regenerative braking energy recovery control method includes the steps of:
and S1, acquiring the direct-current voltage of the direct-current bus of the direct-current traction network in real time, the direct-current side branch current of each rectifier for supplying power to the direct-current bus, and calculating to obtain the total direct-current side current according to all the direct-current side branch currents.
In this embodiment, the direct-current voltage U of the direct-current traction network where the installation point of the regenerative braking energy recovery system is located is collected in real time.
And collecting the direct current side branch currents of all rectifiers supplying power to the direct current bus in the traction substation where the installation point of the regenerative braking energy recovery system is located in real time.
If n rectifiers are provided, the direct current side branch currents of the n rectifiers are collected, and the current side branch currents are respectively as follows: i1, I2. + In, and the dc-side partial currents are added to obtain a dc-side total current I ═ I1+ I2. + In.
And S2, comparing the direct current voltage with a preset voltage threshold value to obtain a voltage comparison result, and comparing the total current of the direct current side with a preset current threshold value to obtain a current comparison result.
In this embodiment, the preset voltage threshold is a system default or a voltage setting value received from a user.
Assume that the preset voltage threshold is Ucharge.
The preset current threshold is a system default value or a current set value input by a user is received.
Assume that the preset current threshold is Icharge.
And S3, performing energy absorption operation or energy release operation according to the voltage comparison result and the current comparison result.
In another embodiment based on the present embodiment, referring to fig. 2, step S3 includes:
and S30, when the direct current voltage is greater than the preset voltage threshold and the total direct current is less than the preset current threshold, performing energy absorption operation.
In this embodiment, U > Ucharge, and I < Ichar, the regenerative braking energy recovery system performs an energy absorption operation.
And S31, when the direct current voltage is smaller than the preset voltage threshold and the total direct current is larger than the preset current threshold, performing energy release operation.
In this embodiment, U < Ucharge, and I > Ichar, the regenerative braking energy recovery system performs an energy release operation.
In the embodiment, the direct-current voltage and the direct-current side total current of the direct-current bus are collected in real time, and the energy absorption operation or the energy release operation is performed according to the voltage comparison result of the direct-current voltage and the preset voltage threshold and the current comparison result of the direct-current side total current and the preset current threshold, so that the accuracy and the reliability of the regenerative braking energy recovery system are improved through a dual judgment mechanism of the direct-current voltage and the direct-current side total current.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
3-4 illustrate one embodiment of the regenerative braking energy recovery system of the present invention. In the present embodiment, as shown in fig. 3, the regenerative braking energy recovery system includes a real-time acquisition module 10, a comparison module 11 and a processing module 12.
The real-time acquisition module 10 is used for acquiring the direct-current voltage of a direct-current bus of the direct-current traction network, the direct-current side branch current of each rectifier for supplying power to the direct-current bus in real time and calculating to obtain the total direct-current side current according to all the direct-current side branch currents; the comparison module 11 is configured to compare the dc voltage with a preset voltage threshold to obtain a voltage comparison result, and compare the total current on the dc side with a preset current threshold to obtain a current comparison result; and the processing module 12 is used for performing energy absorption operation or energy release operation according to the voltage comparison result and the current comparison result.
On the basis of the present embodiment, in other embodiments, referring to fig. 4, the processing module 12 includes an energy absorption processing unit 120 and an energy release processing unit 121.
The energy absorption processing unit 120 is configured to perform an energy absorption operation when the dc voltage is greater than a preset voltage threshold and the total dc current is less than a preset current threshold; the energy release processing unit 121 is configured to perform an energy release operation when the dc voltage is smaller than a preset voltage threshold and the total dc-side current is larger than a preset current threshold.
On the basis of the embodiment, in other embodiments, the preset voltage threshold is a system default value or a voltage set value input by a user is received; the preset current threshold is a system default value or a current set value input by a user is received.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the above division of the functional units and modules is only used for illustration, and in practical applications, the above function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the regenerative braking energy recovery system is divided into different functional units or modules to perform all or part of the above described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the above-mentioned apparatus may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
FIG. 5 illustrates one embodiment of the regenerative braking energy recovery device of the present invention. In this embodiment, as shown in fig. 5, the regenerative braking energy recovery device includes a regenerative braking energy recovery system 1, a dc bus 2, a rectifier assembly 3, a transformer 4, and an ac bus 5, where the regenerative braking energy recovery system 1 is an energy storage type regenerative braking energy recovery system 1.
In this embodiment, the energy storage type regenerative braking energy recovery system 1 includes a flywheel energy storage type regenerative braking energy recovery system, a super capacitor energy storage type regenerative braking energy recovery system, and an electrochemical battery energy storage type regenerative braking energy recovery system.
Specifically, the energy storage type regenerative braking energy recovery system 1 comprises a voltage acquisition end and a current acquisition end; the direct current bus 2 is connected with the energy storage type regenerative braking energy recovery system 1, and the voltage acquisition end is connected with the direct current bus 2; the rectifier assembly 3 comprises a plurality of rectifiers, each rectifier is connected with the direct current bus 2, and the current acquisition end is connected with a sensor on the direct current side of each rectifier; one end of the transformer 4 is connected with the alternating current side of the rectifier; the ac bus 5 is connected to the other end of the transformer 4.
FIG. 6 illustrates one embodiment of the regenerative braking energy recovery device of the present invention. In this embodiment, as shown in fig. 6, the regenerative braking energy recovery device includes a regenerative braking energy recovery system 1, a dc bus 2, a rectifier assembly 3, a transformer 4, an ac bus 5, and an ac system 6, where the regenerative braking energy recovery system 1 is an inverter type regenerative braking energy recovery system 1.
Specifically, the inverter type regenerative braking energy recovery system 1 comprises a voltage acquisition end and a current acquisition end; the direct current bus 2 is connected with the inversion type regenerative braking energy recovery system 1, and the voltage acquisition end is connected with the direct current bus 2; the rectifier assembly 3 comprises a plurality of rectifiers, each rectifier is connected with the direct current bus 2, and the current collection end is connected with the rectifier; one end of the transformer 4 is connected with the direct current side of the rectifier; the alternating current bus 5 is connected with the other end of the transformer 4; the inversion type regenerative braking energy recovery system 1 is connected with the alternating current system 6.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above detailed description of the embodiments of the present invention is provided as an example, and the present invention is not limited to the above described embodiments. It will be apparent to those skilled in the art that any equivalent modifications or substitutions can be made within the scope of the present invention, and thus, equivalent changes and modifications, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.
Claims (8)
1. A regenerative braking energy recovery control method characterized by comprising:
acquiring direct-current voltage of a direct-current bus of a direct-current traction network in real time, direct-current side branch current of each rectifier for supplying power to the direct-current bus, and calculating to obtain direct-current side total current according to all the direct-current side branch currents;
comparing the direct current voltage with a preset voltage threshold value to obtain a voltage comparison result, and comparing the total current of the direct current side with a preset current threshold value to obtain a current comparison result;
performing an energy absorption operation or an energy release operation according to the voltage comparison result and the current comparison result;
the step of performing an energy absorbing operation or an energy releasing operation according to the voltage comparison result and the current comparison result includes:
when the direct current voltage is greater than the preset voltage threshold and the total current of the direct current side is less than the preset current threshold, performing energy absorption operation;
and when the direct current voltage is smaller than the preset voltage threshold and the total current of the direct current side is larger than the preset current threshold, performing energy release operation.
2. The regenerative braking energy recovery control method of claim 1, wherein the preset voltage threshold is a system default or a voltage set value received from a user; the preset current threshold is a system default value or a current set value input by a user.
3. A regenerative braking energy recovery system, characterized in that it comprises:
the real-time acquisition module is used for acquiring the direct-current voltage of a direct-current bus of the direct-current traction network, the direct-current side branch current of each rectifier for supplying power to the direct-current bus and calculating to obtain the total direct-current side current according to all the direct-current side branch currents;
the comparison module is used for comparing the direct current voltage with a preset voltage threshold value to obtain a voltage comparison result, and comparing the total current of the direct current side with a preset current threshold value to obtain a current comparison result;
the processing module is used for carrying out energy absorption operation or energy release operation according to the voltage comparison result and the current comparison result;
the processing module comprises:
the energy absorption processing unit is used for performing energy absorption operation when the direct current voltage is greater than the preset voltage threshold and the total direct current is less than the preset current threshold;
and the energy release processing unit is used for performing energy release operation when the direct current voltage is smaller than the preset voltage threshold and the total current of the direct current side is larger than the preset current threshold.
4. The regenerative braking energy recovery system of claim 3, wherein the preset voltage threshold is a system default or a voltage set point received a user input; the preset current threshold is a system default value or a current set value input by a user.
5. A regenerative braking energy recovery device, characterized by comprising:
the regenerative braking energy recovery system of any of claims 3 to 4, comprising a voltage harvesting terminal and a current harvesting terminal;
the direct current bus is connected with the regenerative braking energy recovery system, and the voltage acquisition end is connected with the direct current bus;
the rectifier assembly comprises a plurality of rectifiers, each rectifier is connected with the direct current bus, and the current collection end is connected with a sensor on the direct current side of each rectifier;
a transformer having one end connected to the ac side of the rectifier;
and the alternating current bus is connected with the other end of the transformer.
6. The regenerative braking energy recovery device of claim 5, wherein the regenerative braking energy recovery system comprises an energy storage type regenerative braking energy recovery system and an inverter type regenerative braking energy recovery system.
7. The regenerative braking energy recovery device of claim 6, wherein the regenerative braking energy recovery system is an inverter type regenerative braking energy recovery system, a direct current side of the inverter type regenerative braking energy recovery system is connected to a traction network direct current bus, and an alternating current side of the inverter type regenerative braking energy recovery system is connected to an alternating current power supply system of the traction substation.
8. The regenerative braking energy recovery device of claim 6, wherein the energy storage type regenerative braking energy recovery system comprises a flywheel energy storage type regenerative braking energy recovery system, a super capacitor energy storage type regenerative braking energy recovery system, and an electrochemical battery energy storage type regenerative braking energy recovery system.
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