CN113629740A - Power control method and control device for connecting flywheel energy storage system to alternating current power grid - Google Patents
Power control method and control device for connecting flywheel energy storage system to alternating current power grid Download PDFInfo
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a power control method and a control device for a flywheel energy storage system to be connected into an alternating current power grid, wherein when the flywheel energy storage system responds to set power, the actual operating power of a converter at a grid-connected side is obtained; performing power closed-loop control according to the set power and the actual operating power to obtain a first output value; calculating a target voltage value of the direct current bus according to a corresponding voltage value and a first output value of the flywheel energy storage system in a preset working state, and performing voltage closed-loop control according to the target voltage value of the direct current bus and a voltage feedback value of the direct current bus to obtain a second output value; and calculating a target current value according to the second output value and the maximum current value of the grid-connected side converter, so that the operating current of the grid-connected side converter is the target current value. The invention can solve the problem that the running power deviates from the required value due to the adoption of a control mode of responding to the direct current network voltage under the application scene that the direct current network voltage response type flywheel energy storage system is accessed to an alternating current power grid.
Description
Technical Field
The invention relates to the technical field of flywheel energy storage, in particular to a power control method and a power control device for a flywheel energy storage system to be connected into an alternating current power grid.
Background
The flywheel energy storage system with the direct-current side grid connection capacity well meets the direct-current grid connection and energy storage and energy saving requirements of industries such as rail transit and the like. After the flywheel energy storage system is connected to the direct current bus, the running power is adjusted by responding to the direct current network voltage: when the direct current network voltage is smaller than another threshold value, the flywheel energy storage system discharges to provide power support for the direct current network, and the power is increased along with the continuous reduction of the bus voltage.
For a grid-connected application scene needing accurate control of the running power of the flywheel, if the flywheel energy storage system is connected to an alternating current power grid and applied to micro-grid frequency modulation, the control mode responding to the direct current network voltage can cause the running power to deviate from a required value, influence the grid-connected effect and fail to achieve the aim of accurately controlling the running index.
Therefore, in the application scenario that the flywheel energy storage system is connected to the alternating current power grid, how to improve the power control precision of the flywheel energy storage system and make the operation power of the flywheel energy storage system meet the required value is a technical problem which needs to be solved urgently in the prior art.
Disclosure of Invention
In view of the above, the invention provides a power control method and a control device for accessing a flywheel energy storage system to an alternating current power grid, which can solve the problem that the operating power deviates from a required value due to the adoption of a control mode of responding to the direct current grid voltage in the application scene of accessing a direct current grid voltage response type flywheel energy storage system to the alternating current power grid.
In a first aspect, an embodiment of the present invention provides a power control method for a flywheel energy storage system to access an ac power grid, including: the method is applied to a grid-connected system, in the grid-connected system, a flywheel energy storage system is connected with a direct current bus through a flywheel side converter, an alternating current network side is connected with the direct current bus through a grid-connected side converter, and the method comprises the following steps:
when the flywheel energy storage system responds to set power, acquiring the actual operating power of the grid-connected side converter;
performing power closed-loop control according to the set power and the actual operating power to obtain a first output value;
calculating a target voltage value of a direct current bus according to a corresponding voltage value of the flywheel energy storage system in a preset working state and the first output value, wherein the preset working state comprises a working state when the power is zero and a working state of full-power charging or discharging;
performing voltage closed-loop control according to the target voltage value of the direct current bus and the voltage feedback value of the direct current bus to obtain a second output value;
and calculating a target current value according to the second output value and the maximum current value of the grid-connected side converter, so that the operating current of the grid-connected side converter is the target current value.
In a possible implementation manner, the performing power closed-loop control according to the set power and the actual operating power to obtain a first output value includes:
subtracting the actual running power from the set power to obtain a power error;
and carrying out PID operation on the power error to obtain the first output value.
In a possible implementation manner, the calculating a target voltage value of the dc bus according to a voltage value corresponding to the flywheel energy storage system in a preset operating state and the first output value includes:
acquiring a first voltage value corresponding to the flywheel energy storage system in a full-power charging or discharging working state;
acquiring a second voltage value corresponding to the flywheel energy storage system in a working state when the power is zero;
and multiplying the first output value by the first voltage value, and adding the second voltage value to obtain the target voltage value.
In a possible implementation manner, the performing voltage closed-loop control according to the target voltage value of the dc bus and the voltage feedback value of the dc bus to obtain a second output value includes:
subtracting the voltage feedback value from the target voltage value to obtain a voltage error;
and carrying out PID operation on the voltage error to obtain the second output value.
In one possible implementation, the method further includes:
multiplying the actual running current value of the flywheel energy storage system by a preset feedforward coefficient to obtain a feedforward result;
and adding the feedforward result and the second output value to obtain a sum value, and multiplying the sum value by the maximum current value of the grid-connected side converter to obtain the target current value.
In one possible implementation, the method further includes:
performing per-unit processing on the first output value, the second output value and the feedforward result to enable the value ranges of the first output value, the second output value and the feedforward result to be preset ranges;
and carrying out amplitude limiting processing on a sum obtained by adding the feedforward result and the second output value so as to enable the value range of the sum to be the preset range.
In one possible implementation, the preset range is [ -1, +1 ].
In a second aspect, an embodiment of the present invention provides a power control apparatus for a flywheel energy storage system to access an ac power grid, where the apparatus is applied to a grid-connected system, in the grid-connected system, the flywheel energy storage system is connected to a dc bus through a flywheel-side converter, and an ac power grid side is connected to the dc bus through a grid-connected-side converter, and the apparatus includes:
the device comprises an acquisition module and a calculation module;
the acquisition module is used for acquiring the actual operating power of the grid-connected side converter when the flywheel energy storage system responds to the set power;
the calculation module is configured to perform power closed-loop control according to the set power and the actual operating power to obtain a first output value, calculate a target voltage value of the dc bus according to a voltage value corresponding to the flywheel energy storage system in a preset operating state and the first output value, where the preset operating state includes an operating state when power is zero and a full-power charging or discharging operating state, perform voltage closed-loop control according to the target voltage value of the dc bus and a voltage feedback value of the dc bus to obtain a second output value, and calculate a target current value according to the second output value and a maximum current value of the grid-connected side converter, so that an operating current of the grid-connected side converter is the target current value.
In a third aspect, an embodiment of the present invention provides a control apparatus, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect when executing the computer program.
In a fourth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the voltage and current sensor is used as a detection component, and the accurate control of the running power of the direct current network voltage response type flywheel energy storage system under the application scene of accessing an alternating current network is realized through the double closed-loop control of power and voltage, so that the use effect of the whole flywheel energy storage system is optimized.
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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 a flowchart illustrating an implementation of a power control method for accessing a flywheel energy storage system to an ac power grid according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a PID algorithm according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a network voltage power relationship of a dc network voltage response type flywheel energy storage system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a PID algorithm after feedforward is added according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a power control device for accessing a flywheel energy storage system to an ac power grid according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a control device 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 a flowchart illustrating an implementation of a power control method for accessing a flywheel energy storage system to an ac power grid according to an embodiment of the present invention. The details are as follows:
in step S101, when the flywheel energy storage system is responding to the set power, the actual operating power of the grid-connected side converter is acquired.
In the embodiment of the invention, when the flywheel energy storage system is connected to the alternating current power grid, rectification and inversion control are required to be carried out through the grid-connected side converter, so that the application of connecting the flywheel to the alternating current power grid is realized. The grid-connected side converter and the flywheel side converter are connected through a direct current bus, and the bus voltage has continuous adjustable capacity. That is, the method provided by the embodiment of the present invention is applied to a grid-connected system in which a flywheel energy storage system is connected to a dc bus through a flywheel-side converter, and an ac grid side is connected to the dc bus through a grid-connected-side converter.
Power generation and utilization imbalance in an ac power grid can cause grid frequency fluctuations that require frequency modulation of the grid in order to dampen such fluctuations. The flywheel energy storage system has the characteristics of high power, high response speed and high circulating capacity, can quickly and effectively perform active or reactive compensation along with the change of a power grid, stabilizes fluctuating load, buffers power generation output transient, and supports the frequency and voltage of the power grid. However, the existing direct current network voltage response type flywheel energy storage system performs power control in a manner of responding to the direct current network voltage, and the control method is difficult to meet the requirement of performing accurate control on the power of the flywheel energy storage system in the application scene of accessing an alternating current power grid.
The algorithm is a closed-loop control algorithm, and a target value and an actual value need to be obtained, so that the next calculation is carried out. The controlled quantity is power, and the actual power is calculated by using the feedback value of the voltage and current sensor.
Optionally, the SET POWER may be represented by POWER _ SET, and the actual operating POWER of the grid-connected converter may be represented by POWER _ fed.
In the embodiment of the invention, a voltage and current sensor is used as a detection component, and the actual operation POWER _ fed of the grid-connected side converter is acquired through the voltage and current sensor.
In step S102, power closed-loop control is performed according to the set power and the actual operating power to obtain a first output value.
In the embodiment of the invention, the set power and the actual operation power are subtracted to obtain a power error; and carrying out PID operation on the power error to obtain a first output value.
Wherein, POWER _ SET is a target value of POWER closed-loop control.
In an embodiment of the present invention, the POWER error may be represented by POWER _ ERR and the first output value may be represented by PID _ OUT 1.
POWER _ ERR is POWER _ SET-POWER _ fed.
Fig. 2 is a schematic diagram of a PID operation method provided in the embodiment of the present invention, but the method provided in the embodiment of the present invention is not limited to the PID operation method shown in fig. 2, and other improved PID algorithms are also applicable to the method provided in the embodiment of the present invention.
In step S103, a target voltage value of the dc bus is calculated according to a corresponding voltage value and a first output value of the flywheel energy storage system in a preset working state, where the preset working state includes a working state when power is zero and a working state of full power charging or discharging.
In the embodiment of the invention, a first voltage value corresponding to a flywheel energy storage system in a full-power charging or discharging working state is obtained; acquiring a second voltage value corresponding to the flywheel energy storage system in a working state when the power is zero; and multiplying the first output value by the first voltage value, and adding the second voltage value to obtain a target voltage value.
Optionally, in this embodiment of the present invention, the first VOLTAGE value may be represented by VOLTAGE _ OFFSET, the second VOLTAGE value may be represented by VOLTAGE _ idle, and the target VOLTAGE value may be represented by VOLTAGE _ SET.
Then:
VOLTAGE_SET＝PID_OUT1×VOLTAGE_OFFSET+VOLTAGE_IDLER
optionally, with reference to fig. 3, a network voltage power relationship of the direct current network voltage response type flywheel energy storage system is shown in fig. 3, the idle network voltage is a small-range network voltage section, and the output power of the flywheel energy storage system in this range is 0. The VOLTAGE at the midpoint is taken as the second VOLTAGE value VOLTAGE _ idle.
The full-power charging VOLTAGE and the full-power discharging VOLTAGE are respectively added or subtracted by a full-power operating VOLTAGE swing range on the basis, and optionally, the maximum value of the full-power operating VOLTAGE swing range is the first VOLTAGE value VOLTAGE _ OFFSET. It should be noted that, for any flywheel energy storage system, the full-power operation voltage swing range thereof needs to be obtained through separate experiments.
Optionally, the flywheel energy storage system has a voltage swing range when the flywheel energy storage system is in full power charging or discharging operation,
the target VOLTAGE value voltag _ SET determines the actual output power of the flywheel energy storage system.
In step S104, voltage closed-loop control is performed according to the target voltage value of the dc bus and the voltage feedback value of the dc bus to obtain a second output value.
In the embodiment of the invention, the target voltage value is subtracted from the voltage feedback value to obtain a voltage error; and carrying out PID operation on the voltage error to obtain a second output value.
VOLTAGE _ SET is the target value for VOLTAGE closed-loop control.
Optionally, the VOLTAGE feedback value of the dc bus may be represented by VOLTAGE _ fed, and the VOLTAGE error may be represented by VOLTAGE _ ERR, then:
VOLTAGE_ERR＝VOLTAGE_SET-VOLTAGE_FEED
alternatively, the second output value may be represented by PID _ OUT 2.
This step is also realized by using the PID operation method shown in fig. 2, and the operation frequency of the voltage closed-loop control is several times the operation frequency of the power closed-loop control in step S102.
Since the power closed loop is an outer loop of the voltage closed loop, the inner loop is required to respond more quickly in order to ensure stability. The operation frequency of the voltage closed-loop control is thus several times that of the power closed-loop control in step S102.
In step S105, a target current value is calculated from the second output value and the maximum current value of the grid-connected converter such that the operating current of the grid-connected converter becomes the target current value.
Alternatively, the target CURRENT value may be represented by CURRENT _ SET, and the maximum CURRENT value of the grid-connected side converter may be represented by CURRENT _ MAX.
Then, in some embodiments, CURRENT _ SET ═ PID _ OUT2 × CURRENT _ MAX
The flywheel energy storage system is arranged at the boundary of an allowed rotating speed range, the upper limit of the rotating speed is the moment of full charge, and the lower limit of the rotating speed is the moment of emptying. At these two rotational speed points, the flywheel power will suddenly change to zero. Sudden changes in power can cause sudden changes in the dc bus voltage and even cause overvoltage faults. In order to solve the problem, the embodiment of the invention also provides a control method based on the load current feedforward control.
The embodiment of the invention solves the problems by the following method: multiplying the actual running current value of the flywheel energy storage system by a preset feedforward coefficient to obtain a feedforward result; and adding the feedforward result and the second output value to obtain a sum value, and multiplying the sum value by the maximum current value of the grid-connected side converter to obtain a target current value.
By the method, the direct-current network voltage sudden change caused by the power sudden change at the boundary of the rotating speed range of the flywheel energy storage system is weakened, and the overvoltage and undervoltage faults are reduced.
Alternatively, the operation diagram of the PID algorithm with the feedforward function is shown in fig. 4.
Alternatively, the actual operating CURRENT value of the flywheel energy storage system can be represented by CURRENT _ fed, the preset feedforward coefficient can be represented by FU, and the feedforward result can be represented by FFC _ OUT.
FFC _ OUT is FU × CURRENT _ fed.
Then in some preferred embodiments:
CURRENT_SET＝(PID_OUT2+FFC_OUT)×CURRENT_MAX
it should be noted that, in the embodiment of the present invention, the actual operating power of the grid-connected side converter, the voltage feedback value of the dc bus, and the actual operating current value of the flywheel energy storage system may all be obtained by a voltage current sensor.
In some embodiments, per-unit processing is performed on the first output value, the second output value and the feedforward result, so that the value ranges of the first output value, the second output value and the feedforward result are preset ranges; and carrying out amplitude limiting processing on the sum obtained by adding the feedforward result and the second output value so as to enable the value range of the sum to be a preset range. The predetermined range is [ -1, +1 ].
With the per-unit processing method, the PID _ OUT1 is limited to the range of +1 to-1, preventing the system performance from being exceeded. The PID _ OUT2 output result is still limited to a range of +1 to-1.
FFC _ OUT is also limited to a range of +1 to-1. Further, the output value range can be appropriately narrowed in accordance with the actual voltage overshoot suppression effect.
The process that the operating current of the grid-connected side converter is the target current value corresponds to the process of an 'executing mechanism' in the PID operation flow shown in fig. 2, and the method provided by the embodiment of the invention is used for obtaining the target current value, and the target current value is correctly executed, which is a precondition for realizing power closed-loop control.
According to the embodiment of the invention, the voltage and current sensor is used as a detection component, and the accurate control of the running power of the direct current network voltage response type flywheel energy storage system under the application scene of accessing an alternating current network is realized through the double closed-loop control of power and voltage, so that the use effect of the whole flywheel energy storage system is optimized.
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. 5 is a schematic structural diagram of a power control apparatus for accessing a flywheel energy storage system into an ac power grid according to an embodiment of the present invention, and for convenience of description, only parts related to the embodiment of the present invention are shown, which are detailed as follows:
as shown in fig. 5, the power control device 5 for connecting the flywheel energy storage system to the ac power grid includes: an acquisition module 51 and a calculation module 52;
the obtaining module 51 is configured to obtain actual operating power of the grid-connected side converter when the flywheel energy storage system responds to the set power;
the calculating module 52 is configured to perform power closed-loop control according to the set power and the actual operating power to obtain a first output value, and calculate a target voltage value of the dc bus according to a voltage value and the first output value of the flywheel energy storage system corresponding to a preset operating state, where the preset operating state includes an operating state when the power is zero and a full-power charging or discharging operating state, perform voltage closed-loop control according to the target voltage value of the dc bus and a voltage feedback value of the dc bus to obtain a second output value, and calculate a target current value according to the second output value and a maximum current value of the grid-connected side converter, so that the operating current of the grid-connected side converter is a target current value.
In one possible implementation, the calculation module 52 is configured to: subtracting the set power from the actual running power to obtain a power error; and carrying out PID operation on the power error to obtain a first output value.
In one possible implementation, the calculation module 52 is configured to: acquiring a first voltage value corresponding to a flywheel energy storage system in a full-power charging or discharging working state; acquiring a second voltage value corresponding to the flywheel energy storage system in a working state when the power is zero; and multiplying the first output value by the first voltage value, and adding the second voltage value to obtain a target voltage value.
In one possible implementation, the calculation module 52 is configured to: subtracting the target voltage value from the voltage feedback value to obtain a voltage error; and carrying out PID operation on the voltage error to obtain a second output value.
In one possible implementation, the calculation module 52 is configured to: multiplying the actual running current value of the flywheel energy storage system by a preset feedforward coefficient to obtain a feedforward result; and adding the feedforward result and the second output value to obtain a sum value, and multiplying the sum value by the maximum current value of the grid-connected side converter to obtain a target current value.
In one possible implementation, the calculation module 52 is further configured to: performing per-unit processing on the first output value, the second output value and the feedforward result to enable the value ranges of the first output value, the second output value and the feedforward result to be preset ranges; and carrying out amplitude limiting processing on the sum obtained by adding the feedforward result and the second output value so as to enable the value range of the sum to be a preset range.
In one possible implementation, the preset range is [ -1, +1 ].
According to the embodiment of the invention, the voltage and current sensor is used as a detection component, and the accurate control of the running power of the direct current network voltage response type flywheel energy storage system under the application scene of accessing an alternating current network is realized through the double closed-loop control of power and voltage, so that the use effect of the whole flywheel energy storage system is optimized.
The power control apparatus for accessing the flywheel energy storage system to the ac power grid provided by this embodiment may be used to implement the above-mentioned power control method embodiment for accessing the flywheel energy storage system to the ac power grid, and its implementation principle and technical effect are similar, and this embodiment is not described herein again.
Fig. 6 is a schematic diagram of a control device according to an embodiment of the present invention. As shown in fig. 6, the control device 6 of this embodiment includes: a processor 60, a memory 61 and a computer program 62 stored in said memory 61 and executable on said processor 60. The processor 60, when executing the computer program 62, implements the steps in the above-described embodiments of the power control method for accessing the flywheel energy storage system to the ac power grid, such as the steps 101 to 106 shown in fig. 1. Alternatively, the processor 60, when executing the computer program 62, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the units 41 to 42 shown in fig. 4.
Illustratively, the computer program 62 may be partitioned into one or more modules/units that are stored in the memory 61 and executed by the processor 60 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 62 in the control device 6.
The control device 6 may include, but is not limited to, a processor 60, a memory 61. It will be appreciated by those skilled in the art that fig. 6 is merely an example of the control apparatus 6, and does not constitute a limitation of the control apparatus 6, and may include more or less components than those shown, or combine some components, or different components, for example, the control apparatus may further include input-output devices, network access devices, buses, and the like.
The Processor 60 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 device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may be an internal storage unit of the control device 6, such as a hard disk or a memory of the control device 6. The memory 61 may also be an external storage device of the control apparatus 6, 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 control apparatus 6. Further, the memory 61 may also include both an internal storage unit of the control apparatus 6 and an external storage device. The memory 61 is used for storing the computer programs and other programs and data required by the control device. The memory 61 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 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 system may refer to the corresponding processes in the foregoing method embodiments, and 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 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 invention.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/control apparatus and method may be implemented in other ways. For example, the above-described apparatus/control apparatus 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 implementing, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. 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 also be implemented by a computer program to instruct related hardware, where the computer program 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 power control method for accessing the flywheel energy storage system to the ac power grid 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, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. 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 (10)
1. A power control method for accessing a flywheel energy storage system to an alternating current power grid is characterized in that the method is applied to a grid-connected system, in the grid-connected system, the flywheel energy storage system is connected with a direct current bus through a flywheel side converter, an alternating current power grid side is connected with the direct current bus through a grid-connected side converter, and the method comprises the following steps:
when the flywheel energy storage system responds to set power, acquiring the actual operating power of the grid-connected side converter;
performing power closed-loop control according to the set power and the actual operating power to obtain a first output value;
calculating a target voltage value of a direct current bus according to a corresponding voltage value of the flywheel energy storage system in a preset working state and the first output value, wherein the preset working state comprises a working state when the power is zero and a working state of full-power charging or discharging;
performing voltage closed-loop control according to the target voltage value of the direct current bus and the voltage feedback value of the direct current bus to obtain a second output value;
and calculating a target current value according to the second output value and the maximum current value of the grid-connected side converter, so that the operating current of the grid-connected side converter is the target current value.
2. The method of claim 1, wherein performing closed-loop power control based on the set power and the actual operating power to obtain a first output value comprises:
subtracting the actual running power from the set power to obtain a power error;
and carrying out PID operation on the power error to obtain the first output value.
3. The method of claim 2, wherein calculating the target voltage value of the dc bus according to the voltage value corresponding to the flywheel energy storage system in the preset operating state and the first output value comprises:
acquiring a first voltage value corresponding to the flywheel energy storage system in a full-power charging or discharging working state;
acquiring a second voltage value corresponding to the flywheel energy storage system in a working state when the power is zero;
and multiplying the first output value by the first voltage value, and adding the second voltage value to obtain the target voltage value.
4. The method of claim 1, wherein performing voltage closed-loop control according to the target voltage value of the dc bus and the voltage feedback value of the dc bus to obtain a second output value comprises:
subtracting the voltage feedback value from the target voltage value to obtain a voltage error;
and carrying out PID operation on the voltage error to obtain the second output value.
5. The method of any one of claims 1 to 4, further comprising:
multiplying the actual running current value of the flywheel energy storage system by a preset feedforward coefficient to obtain a feedforward result;
and adding the feedforward result and the second output value to obtain a sum value, and multiplying the sum value by the maximum current value of the grid-connected side converter to obtain the target current value.
6. The method of claim 5, further comprising:
performing per-unit processing on the first output value, the second output value and the feedforward result to enable the value ranges of the first output value, the second output value and the feedforward result to be preset ranges;
and carrying out amplitude limiting processing on a sum obtained by adding the feedforward result and the second output value so as to enable the value range of the sum to be the preset range.
7. The method of claim 6, wherein the preset range is [ -1, +1 ].
8. A power control device for a flywheel energy storage system to be connected to an alternating current power grid is characterized in that the device is applied to a grid-connected system, in the grid-connected system, the flywheel energy storage system is connected with a direct current bus through a flywheel side converter, an alternating current power grid side is connected with the direct current bus through a grid-connected side converter, and the power control device comprises: the device comprises an acquisition module and a calculation module;
the acquisition module is used for acquiring the actual operating power of the grid-connected side converter when the flywheel energy storage system responds to the set power;
the calculation module is configured to perform power closed-loop control according to the set power and the actual operating power to obtain a first output value, calculate a target voltage value of the dc bus according to a voltage value corresponding to the flywheel energy storage system in a preset operating state and the first output value, where the preset operating state includes an operating state when power is zero and a full-power charging or discharging operating state, perform voltage closed-loop control according to the target voltage value of the dc bus and a voltage feedback value of the dc bus to obtain a second output value, and calculate a target current value according to the second output value and a maximum current value of the grid-connected side converter, so that an operating current of the grid-connected side converter is the target current value.
9. A control apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of the preceding claims 1 to 7 when executing the computer program.
10. 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 7.
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