CN114709832A - Control method and device for combined use of traction power supply system and flywheel energy storage device - Google Patents
Control method and device for combined use of traction power supply system and flywheel energy storage device Download PDFInfo
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- CN114709832A CN114709832A CN202210217840.8A CN202210217840A CN114709832A CN 114709832 A CN114709832 A CN 114709832A CN 202210217840 A CN202210217840 A CN 202210217840A CN 114709832 A CN114709832 A CN 114709832A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J15/00—Systems for storing electric energy
- H02J15/007—Systems for storing electric energy involving storage in the form of mechanical energy, e.g. fly-wheels
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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Abstract
The invention provides a control method and a device for the combined use of a traction power supply system and a flywheel energy storage device, wherein the method comprises the following steps: acquiring the current required voltage of the direct current end of the railway power regulator; acquiring the direct current bus voltage at the direct current end of the railway power regulator at the current sampling moment, and calculating the real-time voltage difference at the current sampling moment according to the current required voltage and the direct current bus voltage at the current sampling moment; determining a required voltage adjustment value based on the real-time voltage difference at the current sampling moment; the required voltage adjustment value increases with the increase of the real-time voltage difference; and obtaining a voltage set value at the current sampling moment according to the current required voltage and the required voltage adjustment value at the current sampling moment. Through the scheme, the voltage set value can be adjusted based on the real-time voltage difference, so that the voltage of the direct current bus is more smoothly close to the set value, and the problem of overcurrent of the direct current bus of the railway power regulator is solved.
Description
Technical Field
The invention relates to the technical field of traction networks, in particular to a control method and a control device for the combined use of a traction power supply system and a flywheel energy storage device.
Background
A Railway Power Conditioner (RPC) is a common bus connection of two groups of back-to-back converters, as shown in fig. 1, fig. 1 shows a combination of a traction power supply system and a flywheel energy storage device, which includes the traction power supply system, the Railway power conditioner and the flywheel energy storage device; railway with AC end of one-side converter PCS1 of railway power conditioner connected in parallel with traction power supply system
Arm feeder line and the alternating current end of the other side converter PCS2 are connected in parallel to the railway of a traction power supply system
And the arm feeder line and the direct current end of the railway power regulator are connected with the flywheel energy storage device through a direct current bus.
The RPC control unit is used for receiving a voltage instruction and a power instruction of the direct-current bus, and after receiving the instruction, the RPC control unit issues the voltage instruction to one of the converters to enable the converter to be used for regulating the voltage of the direct-current side; and issuing a power instruction to the converter on the other side to ensure that the converter is responsible for power regulation. However, the RPC direct current bus has the problem of instantaneous overcurrent after the control strategy is adopted.
Disclosure of Invention
In view of this, the invention provides a control method and a control device for a combined use of a traction power supply system and a flywheel energy storage device, which can solve the problem of instantaneous overcurrent of an RPC direct current bus.
In a first aspect, an embodiment of the present invention provides a control method for a traction power supply system and a flywheel energy storage device, where the traction power supply system is connected to the flywheel energy storage device through a railway power regulator, an ac terminal of the railway power regulator is connected to the traction power supply system, and a dc terminal of the railway power regulator is connected to the flywheel energy storage device; the method comprises the following steps:
acquiring the current required voltage of the direct current end of the railway power regulator;
acquiring the direct current bus voltage at the direct current end of the railway power regulator at the current sampling moment, and calculating the real-time voltage difference at the current sampling moment according to the current required voltage and the direct current bus voltage at the current sampling moment;
determining a required voltage adjustment value based on the real-time voltage difference at the current sampling moment; the demand voltage adjustment value increases with an increase in the real-time voltage difference;
and obtaining a voltage set value at the current sampling moment according to the current required voltage and the required voltage adjustment value at the current sampling moment, and adjusting the direct-current bus voltage of the railway power regulator by adopting the voltage set value at the current sampling moment.
In a second aspect, an embodiment of the present invention provides a control device for a traction power supply system and a flywheel energy storage device, where the traction power supply system is connected to the flywheel energy storage device through a railway power regulator, an ac terminal of the railway power regulator is connected to the traction power supply system, and a dc terminal of the railway power regulator is connected to the flywheel energy storage device;
the control device includes:
the required voltage acquisition module is used for acquiring the current required voltage of the direct current end of the railway power regulator;
the real-time voltage difference calculation module is used for acquiring the direct-current bus voltage at the direct-current end of the railway power regulator at the current sampling moment and calculating the real-time voltage difference at the current sampling moment according to the current required voltage and the direct-current bus voltage at the current sampling moment;
the voltage adjusting value calculating module is used for determining a required voltage adjusting value based on the real-time voltage difference at the current sampling moment; the demand voltage adjustment value increases with an increase in the real-time voltage difference;
and the direct-current voltage regulating module is used for obtaining a voltage set value at the current sampling moment according to the current required voltage and the required voltage regulating value at the current sampling moment, and regulating the direct-current bus voltage of the railway power regulator by adopting the voltage set value at the current sampling moment.
In a third aspect, an embodiment of the present invention provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor, when executing the computer program, implements the steps of the control method for the combined use of the traction power supply system and the flywheel energy storage device according to any one of the possible implementations of the first aspect.
In a fourth aspect, the embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the steps of the control method for the combination of the traction power supply system and the flywheel energy storage device according to any one of the possible implementations of the first aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the method comprises the steps of firstly, obtaining the current required voltage of a direct current end of the railway power regulator; then acquiring the direct current bus voltage at the direct current end of the railway power regulator at the current sampling moment, and calculating the real-time voltage difference at the current sampling moment according to the current required voltage and the direct current bus voltage at the current sampling moment; determining a required voltage adjustment value based on the real-time voltage difference at the current sampling moment; the demand voltage adjustment value increases with an increase in the real-time voltage difference; and finally, obtaining a voltage set value at the current sampling moment according to the current required voltage and the required voltage adjustment value at the current sampling moment, and adjusting the direct-current bus voltage of the railway power regulator by adopting the voltage set value at the current sampling moment. Through the scheme, the voltage set value can be adjusted based on the real-time voltage difference, the direct-current bus voltage is smoother and close to the set value, the output power of the flywheel energy storage device responding to the voltage strategy is smoother, and the problem of overcurrent of the direct-current bus of the railway power regulator is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is an application scenario diagram of a control method for a combination of a traction power supply system and a flywheel energy storage device according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an implementation of a control method for a combination of a traction power supply system and a flywheel energy storage device according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a control device for use with a traction power supply system and a flywheel energy storage device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is an application scenario diagram of a control method for combined use of a traction power supply system and a flywheel energy storage device according to an embodiment of the present invention. As shown in fig. 1, the traction power supply system is connected to the flywheel energy storage device through a railway power conditioner, an ac terminal of the railway power conditioner is connected to the traction power supply system, and a dc terminal of the railway power conditioner is connected to the flywheel energy storage device.
Specifically, the railway power conditioner comprises converters PCS1 and PCS2, a traction station
The arm circuit is connected with the alternating current end of the converter PCS1 and is used for traction
The arm line is connected with the alternating current end of the converter PCS2, and the direct current end of the converter is connected with the flywheel energy storage device through a direct current bus. Therefore, the energy intercommunication between the traction power supply system and the flywheel energy storage device is realized.
Referring to fig. 2, it shows a flowchart of an implementation of a control method for a combination of a traction power supply system and a flywheel energy storage device provided in an embodiment of the present invention, which is detailed as follows:
s101: and acquiring the current required voltage of the direct current end of the railway power regulator.
The execution subject of the present embodiment may be a control unit of a railway power conditioner.
Specifically, the specific implementation process of S101 includes:
s201: acquiring load data of the traction power supply system in the current period;
s202: and calculating the current required voltage of the direct current end of the railway power regulator based on the load data of the traction power supply system in the current period.
In one embodiment, the specific implementation flow of S201 includes:
acquiring the network side voltage and the network side current of the traction power supply system in the current period;
and calculating the product of the network side voltage and the network side current of the traction power supply system in the current period to obtain the load power of the traction power supply system in the current period.
In this embodiment, the current period of the traction power supply system is obtained
The voltage and current of the arm line, and then the traction power supply system for the current period
The product of the voltage and the current of the arm line is obtained to obtain the traction power supply system in the current period
Load power of the arm line. Traction power supply system for acquiring current period
The voltage and current of the arm line, and then the traction power supply system for the current period
The product of the voltage and the current of the arm line is obtained to obtain the traction power supply system in the current period
Load power of the arm line.
In one embodiment, the load data includes load power; the specific implementation flow of S202 includes:
for the traction power supply system in the current cycle
Arm line load power and
summing the load power of the arm lines to obtain the sum of the load power of the traction power supply system in the current period;
and calculating the current required voltage according to the sum of the load power of the traction power supply system in the current period.
In this embodiment, the sign of the load power is positive and represents a traction condition, the sign of the load power is negative and represents a braking condition, the traction power supply system requires energy under the traction condition, the traction power supply system recovers braking energy under the braking condition, and the energy requirement condition of the traction power supply system at the current sampling moment can be analyzed according to the sum of the load powers, so that the current required voltage can be calculated according to the sum of the load powers.
In one embodiment, the concrete implementation process of the step "calculating the current required voltage according to the sum of the load powers of the traction power supply system in the current period" includes:
determining the working mode of the railway power regulator in the current period according to the sum of the load power of the traction power supply system in the current period;
and calculating the current required voltage according to the working mode of the railway power regulator in the current period and the sum of the load power of the traction power supply system in the current period.
In this embodiment, the operating modes of the railway power conditioner include a flywheel charging mode, a flywheel discharging mode, a transfer mode, and a peak clipping mode. In order to determine the working mode of the railway power regulator, a plurality of preset thresholds can be set firstly, wherein the preset thresholds comprise a preset charging threshold, a preset discharging threshold, a preset transferring threshold and a preset peak clipping threshold, the preset charging threshold is smaller than zero, the preset discharging threshold is larger than zero, and the preset peak clipping threshold is larger than the preset discharging threshold.
When the sum of the load power is smaller than the preset charging threshold value, the traction power supply system in the current period can be judged to be in the braking working condition, and the flywheel energy storage device can be charged, so that the railway power regulator works in a flywheel charging mode.
When the sum of the load power is less than zero but greater than a preset charging threshold, calculating
Arm line load power and
the absolute value of the difference between the line load power of the arm if
Arm line load power and
and if the absolute value of the difference value of the load power of the arm line is greater than the preset transfer threshold value, the railway power regulator can be judged to work in the transfer mode. If the sum of the load power is less than zero but greater than the preset charging threshold, and
arm line load power and
and if the absolute value of the difference value of the load power of the arm line is smaller than a preset transfer threshold value, judging that the railway power regulator is in a standby mode.
And when the sum of the load power is greater than a preset discharge threshold value but less than a preset peak clipping threshold value, acquiring the current residual capacity of the flywheel energy storage device, and if the current residual capacity of the flywheel energy storage device is greater than zero, judging that the railway power regulator works in a flywheel discharge mode.
When the sum of the load power is greater than the preset discharge threshold but less than the preset peak clipping threshold and the current remaining capacity of the flywheel energy storage device is equal to zero, judging
Arm line load power and
and judging whether the absolute value of the difference value of the load power of the arm line is greater than a preset transfer threshold value, if so, judging that the railway power regulator works in a transfer mode, and otherwise, judging that the railway power regulator works in a standby mode.
And when the sum of the load power is greater than a preset peak clipping threshold value and the current residual capacity of the flywheel energy storage device is not equal to zero, judging that the railway power regulator works in a peak clipping mode.
When the sum of the load power is greater than a preset peak clipping threshold value and the current residual electric quantity of the flywheel energy storage device is equal to zero, judging that the sum is greater than the preset peak clipping threshold value
Arm line load power and
and judging whether the absolute value of the difference value of the load power of the arm line is greater than a preset transfer threshold value, if so, judging that the railway power regulator works in a transfer mode, and otherwise, judging that the railway power regulator works in a standby mode.
And after the working mode of the railway power regulator is determined, determining the required voltage according to the working mode of the railway power regulator, the direction and the magnitude of the load power.
S102: and acquiring the direct current bus voltage at the direct current end of the railway power regulator at the current sampling moment, and calculating the real-time voltage difference at the current sampling moment according to the current required voltage and the direct current bus voltage at the current sampling moment.
In this embodiment, the sampling period of the dc bus voltage is different from the sampling period of the load data of the traction power supply system, and the sampling period of the load data of the traction power supply system is longer than the sampling period of the dc bus voltage. Illustratively, the sampling period of the dc bus voltage is 100ms, and the sampling period of the load data is 1 s. I.e. the update period of the demand voltage is 1s and the update period of the voltage set-point is 100 ms. The real-time voltage difference at the current sampling moment can be obtained by subtracting the direct-current bus voltage at the current sampling moment from the current required voltage.
S103: determining a required voltage adjustment value based on the real-time voltage difference at the current sampling moment; the demand voltage adjustment value increases as the real-time voltage difference increases.
In one embodiment, the specific implementation flow of S103 includes:
determining a demand voltage difference according to the current demand voltage and the previous demand voltage;
acquiring voltage difference thresholds of multiple levels according to the demand voltage difference;
and taking the voltage difference threshold value smaller than the real-time voltage difference as a target voltage difference threshold value, and selecting the maximum value in the target voltage difference threshold value as a required voltage adjustment value.
In this embodiment, the required voltage difference is obtained by subtracting the required voltage of the previous cycle from the required voltage of the current cycle. After the required voltage difference of the current period is obtained, a plurality of preset percentage values can be selected from 0% to 100%, and then the required voltage difference is multiplied by each preset percentage value respectively to obtain voltage difference threshold values of a plurality of levels.
After obtaining a plurality of voltage difference threshold values, sequencing the voltage difference threshold values from large to small, sequentially judging whether the real-time voltage difference is larger than the voltage difference threshold values in the sequence, if so, stopping downward judgment, and taking the voltage difference threshold value as a required voltage adjustment value, otherwise, continuously judging whether the real-time voltage difference is larger than the voltage difference threshold value of the next sequence, and repeating the process until the required voltage adjustment value is obtained.
For example, the required voltage difference is
If the predetermined percentage values are 25%, 50% and 75%, the corresponding voltage difference threshold is set to
、
And
。
s104: and obtaining a voltage set value at the current sampling moment according to the current required voltage and the required voltage adjustment value at the current sampling moment, and adjusting the direct-current bus voltage of the railway power regulator by adopting the voltage set value at the current sampling moment.
In one embodiment, the specific implementation flow of S104 includes:
and subtracting the required voltage adjustment value at the current sampling moment from the current required voltage to obtain the voltage set value at the current sampling moment.
In this embodiment, after the voltage set value at the current sampling time is obtained, the voltage command carrying the voltage set value is sent to the one-side converter, so that the dc bus voltage of the railway power conditioner gradually approaches the required voltage.
In the current period, a voltage set value can be determined at each sampling moment through the algorithm, and the voltage set value is slowly adjusted to the current required voltage, so that the voltage of the direct-current bus gradually approaches the current required voltage, and the overcurrent phenomenon generated in the process that the railway power regulator is matched with the flywheel energy storage value is avoided.
Through the scheme, the current working condition can be judged quickly and accurately, the voltage command is issued by adopting the slope control strategy, the energy transfer at the system level is tightly combined with the energy stored in the flywheel, the output power of the flywheel energy storage device reaches the slope response effect, and the overcurrent phenomenon generated when the RPC is matched with the flywheel energy storage value is avoided.
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 invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 3 shows a schematic structural diagram of a control device for use in combination of a traction power supply system and a flywheel energy storage device, which is provided by an embodiment of the present invention, and for convenience of description, only the relevant parts of the embodiment of the present invention are shown, and the detailed description is as follows:
as shown in fig. 3, the control device 100 for use with a traction power supply system and a flywheel energy storage device includes:
a required voltage obtaining module 110, configured to obtain a current required voltage at a dc terminal of the railway power regulator;
the real-time voltage difference calculation module 120 is configured to obtain a dc bus voltage at the dc end of the railway power regulator at the current sampling time, and calculate a real-time voltage difference at the current sampling time according to the current required voltage and the dc bus voltage at the current sampling time;
a voltage adjustment value calculating module 130, configured to determine a required voltage adjustment value based on the real-time voltage difference at the current sampling time; the demand voltage adjustment value increases with an increase in the real-time voltage difference;
and the direct current voltage regulating module 140 is configured to obtain a voltage set value at the current sampling time according to the current required voltage and the required voltage adjustment value at the current sampling time, and regulate the direct current bus voltage of the railway power regulator by using the voltage set value at the current sampling time.
In one embodiment, the voltage adjustment value calculation module 130 includes:
the demand voltage difference calculation unit is used for determining a demand voltage difference according to the current demand voltage and the previous demand voltage;
the voltage difference threshold setting unit is used for acquiring voltage difference thresholds of multiple levels according to the required voltage difference;
and the voltage adjustment value calculating unit is used for taking the voltage difference threshold value smaller than the real-time voltage difference as a target voltage difference threshold value and selecting the maximum value in the target voltage difference threshold value as a required voltage adjustment value.
In one embodiment, the dc voltage regulation module 140 includes:
and subtracting the required voltage adjustment value at the current sampling moment from the current required voltage to obtain the voltage set value at the current sampling moment.
In one embodiment, the demand voltage acquisition module 110 includes:
the load data acquisition unit is used for acquiring the load data of the traction power supply system in the current period;
and the current required voltage acquisition unit is used for calculating the current required voltage of the direct current end of the railway power regulator based on the load data of the traction power supply system in the current period.
In one embodiment, the load data includes load power; the current demand voltage acquisition unit includes:
to the traction power supply system in the current periodIs/are as follows
Arm line load power sum
Summing the load power of the arm lines to obtain the sum of the load power of the traction power supply system in the current period;
and calculating the current required voltage according to the sum of the load power of the traction power supply system in the current period.
In one embodiment, the load data includes load power; the load data acquisition unit includes:
acquiring the network side voltage and the network side current of the traction power supply system in the current period;
and calculating the product of the network side voltage and the network side current of the traction power supply system in the current period to obtain the load power of the traction power supply system in the current period.
Fig. 4 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 4, the terminal 4 of this embodiment includes: a processor 40, a memory 41 and a computer program 42 stored in said memory 41 and executable on said processor 40. The processor 40, when executing the computer program 42, implements the steps in each of the above-described embodiments of the control method for the combination of the traction power supply system and the flywheel energy storage device, such as the steps 101 to 104 shown in fig. 2. Alternatively, the processor 40, when executing the computer program 42, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the modules 110 to 140 shown in fig. 3.
Illustratively, the computer program 42 may be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 42 in the terminal 4.
The terminal 4 may include, but is not limited to, a processor 40, a memory 41. Those skilled in the art will appreciate that fig. 4 is merely an example of a terminal 4 and does not constitute a limitation of terminal 4, and may include more or fewer components than shown, or some components may be combined, or different components, e.g., the terminal may also include input-output devices, network access devices, buses, etc.
The Processor 40 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the terminal 4, such as a hard disk or a memory of the terminal 4. The memory 41 may also be an external storage device of the terminal 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like provided on the terminal 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the terminal 4. The memory 41 is used for storing the computer program and other programs and data required by the terminal. The memory 41 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned 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 used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the present application. For the specific working processes of the units and modules in the system, reference may be made to the corresponding processes in the foregoing method embodiments, which are not described herein again.
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 technical solution. 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 invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention 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 integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the control method for combining the traction power supply system and the flywheel energy storage device may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, and software distribution medium, etc. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (8)
1. A control method for the combined use of a traction power supply system and a flywheel energy storage device is characterized in that the traction power supply system is connected with the flywheel energy storage device through a railway power regulator, the alternating current end of the railway power regulator is connected with the traction power supply system, and the direct current end of the railway power regulator is connected with the flywheel energy storage device; the method comprises the following steps:
acquiring the current required voltage of the direct current end of the railway power regulator;
acquiring the direct current bus voltage at the direct current end of the railway power regulator at the current sampling moment, and calculating the real-time voltage difference at the current sampling moment according to the current required voltage and the direct current bus voltage at the current sampling moment;
determining a required voltage adjustment value based on the real-time voltage difference at the current sampling moment; the demand voltage adjustment value increases with an increase in the real-time voltage difference;
obtaining a voltage set value at the current sampling moment according to the current required voltage and a required voltage adjustment value at the current sampling moment, and adjusting the direct-current bus voltage of the railway power regulator by adopting the voltage set value at the current sampling moment;
the determining of the required voltage adjustment value based on the real-time voltage difference at the current sampling moment includes:
determining a demand voltage difference according to the current demand voltage and the previous demand voltage;
acquiring voltage difference thresholds of multiple levels according to the demand voltage difference;
and taking the voltage difference threshold value smaller than the real-time voltage difference as a target voltage difference threshold value, and selecting the maximum value in the target voltage difference threshold value as a required voltage adjustment value.
2. The control method for the combined use of the traction power supply system and the flywheel energy storage device according to claim 1, wherein the obtaining of the voltage set value at the current sampling time according to the current required voltage and the required voltage adjustment value at the current sampling time comprises:
and subtracting the required voltage adjustment value at the current sampling moment from the current required voltage to obtain the voltage set value at the current sampling moment.
3. The control method for use of a traction power supply system and a flywheel energy storage device according to claim 1, wherein the obtaining of the current required voltage at the dc terminal of the railway power conditioner comprises:
acquiring load data of the traction power supply system in the current period;
and calculating the current required voltage of the direct current end of the railway power regulator based on the load data of the traction power supply system in the current period.
4. The traction power supply system and flywheel energy storage device combination control method of claim 3, wherein the load data includes load power;
the method for calculating the current demand voltage of the direct current end of the railway power regulator based on the load data of the traction power supply system in the current period comprises the following steps:
for the traction power supply system in the current cycle
Arm line load power and
summing the load power of the arm lines to obtain the sum of the load power of the traction power supply system in the current period;
and calculating the current required voltage according to the sum of the load power of the traction power supply system in the current period.
5. The traction power supply system and flywheel energy storage device combination control method of claim 3, wherein the load data includes load power; the acquiring load data of the traction power supply system in the current period comprises:
acquiring the network side voltage and the network side current of the traction power supply system in the current period;
and calculating the product of the network side voltage and the network side current of the traction power supply system in the current period to obtain the load power of the traction power supply system in the current period.
6. A control device for the combined use of a traction power supply system and a flywheel energy storage device is characterized in that the traction power supply system is connected with the flywheel energy storage device through a railway power regulator, the alternating current end of the railway power regulator is connected with the traction power supply system, and the direct current end of the railway power regulator is connected with the flywheel energy storage device;
the control device includes:
the required voltage acquisition module is used for acquiring the current required voltage of the direct current end of the railway power regulator;
the real-time voltage difference calculation module is used for acquiring the direct-current bus voltage at the direct-current end of the railway power regulator at the current sampling moment and calculating the real-time voltage difference at the current sampling moment according to the current required voltage and the direct-current bus voltage at the current sampling moment;
the voltage adjusting value calculating module is used for determining a required voltage adjusting value based on the real-time voltage difference at the current sampling moment; the demand voltage adjustment value increases with an increase in the real-time voltage difference;
the direct current voltage adjusting module is used for obtaining a voltage set value at the current sampling moment according to the current required voltage and a required voltage adjusting value at the current sampling moment, and adjusting the direct current bus voltage of the railway power regulator by adopting the voltage set value at the current sampling moment;
the voltage adjustment value calculation module includes:
the demand voltage difference calculation unit is used for determining a demand voltage difference according to the current demand voltage and the previous demand voltage;
the voltage difference threshold setting unit is used for acquiring voltage difference thresholds of multiple levels according to the required voltage difference;
and the voltage adjustment value calculating unit is used for taking the voltage difference threshold value smaller than the real-time voltage difference as a target voltage difference threshold value and selecting the maximum value in the target voltage difference threshold value as a required voltage adjustment value.
7. A terminal, characterized in that it comprises a processor and a memory for storing a computer program, the processor being adapted to invoke and execute the computer program stored in the memory, performing the method according to any of claims 1 to 5.
8. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5 above.
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| CN117955077A (en) * | 2024-03-27 | 2024-04-30 | 盾石磁能科技有限责任公司 | Charging and discharging control method, device and equipment of flywheel energy storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117955077A (en) * | 2024-03-27 | 2024-04-30 | 盾石磁能科技有限责任公司 | Charging and discharging control method, device and equipment of flywheel energy storage system |
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