CN111313525B - Cooperative charging and discharging control method for flywheel energy storage device and energy storage converter - Google Patents
Cooperative charging and discharging control method for flywheel energy storage device and energy storage converter Download PDFInfo
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- CN111313525B CN111313525B CN202010406935.5A CN202010406935A CN111313525B CN 111313525 B CN111313525 B CN 111313525B CN 202010406935 A CN202010406935 A CN 202010406935A CN 111313525 B CN111313525 B CN 111313525B
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention discloses a cooperative charging and discharging control method of a flywheel energy storage device and an energy storage converter, which comprises the following steps: acquiring direct-current bus voltage in real time, judging the working state of the energy storage converter according to the direct-current bus voltage and determining charging and discharging stable voltage; based on the PID regulator, calculating the charge and discharge power of the energy storage converter according to the DC bus voltage and the charge and discharge stable voltage; performing charging and discharging operation according to the charging and discharging power so that the direct-current side voltage of the energy storage converter is charging and discharging stable voltage; the flywheel energy storage device receives a control instruction and charging and discharging instruction power of a superior control system, judges whether the flywheel energy storage device is in a chargeable and dischargeable state or not, and carries out charging and discharging operation according to a judgment result, the control instruction and the charging and discharging instruction power. Through the mode, the problem that the flywheel energy storage device and the energy storage converter need to be coordinately controlled through communication can be solved, the control complexity is simplified, and the charging and discharging response speed is improved.
Description
Technical Field
The invention relates to the field of flywheel energy storage, in particular to a cooperative charging and discharging control method of a flywheel energy storage device and an energy storage converter.
Background
The flywheel energy storage device is a physical energy storage device which stores energy by utilizing kinetic energy of a high-speed rotating flywheel, and the mutual conversion of the kinetic energy and the electric energy is realized through an alternating current motor. The machine end of the alternating current motor is three-phase alternating current, and the frequency of the alternating current is changed. A flywheel converter with a DC/AC bidirectional conversion function is arranged in the flywheel energy storage device, the AC side of the flywheel converter is connected with the alternating current motor, and the DC side of the flywheel converter is used as an external interface of the flywheel energy storage device. During charging, the alternating current motor is in a motor running mode, direct current input from the outside is converted into alternating current through the flywheel converter to drive the motor to rotate in an accelerating mode, and electric energy is converted into kinetic energy of the flywheel; when discharging, the alternating current motor is in a generator operation mode, kinetic energy of the flywheel is converted into electric energy, and the flywheel converter converts alternating current at the machine end into direct current for outputting.
Because the interface of the flywheel energy storage device for external charging and discharging is a direct current interface, if the flywheel energy storage device is to be connected to an alternating current system, the conversion between direct current and alternating current needs to be realized through an energy storage converter (PCS for short) with an AC/DC bidirectional conversion function. The flywheel energy storage device and the energy storage converter need to be combined into a system whole to be charged or discharged cooperatively. During charging and discharging, the flywheel converter and the energy storage converter are controlled in a coordinated and consistent manner. In the prior art, the flywheel converter and the energy storage converter need to be subjected to cooperative charging and discharging control through communication, the charging and discharging response speed is low, and the control cooperation is complex.
Disclosure of Invention
The invention provides a cooperative charging and discharging control method of a flywheel energy storage device and an energy storage converter, which can solve the problem that the flywheel energy storage device and the energy storage converter need to be coordinately controlled through communication, simplifies the control complexity and improves the charging and discharging response speed.
In order to solve the technical problems, the invention adopts a technical scheme that: the method for controlling cooperative charging and discharging of the flywheel energy storage device and the energy storage converter is provided, the energy storage converter is connected with the flywheel energy storage device through a direct current bus, the flywheel energy storage device is connected with a superior control system, and the method comprises the following steps: .
Acquiring direct-current bus voltage in real time, judging the working state of the energy storage converter according to the direct-current bus voltage and determining charging and discharging stable voltage;
based on a PID regulator, calculating the charge and discharge power of the energy storage converter according to the direct current bus voltage and the charge and discharge stable voltage;
and performing charging and discharging operation according to the charging and discharging power so that the direct-current side voltage of the energy storage converter is the charging and discharging stable voltage.
According to an embodiment of the present invention, the step of obtaining the dc bus voltage in real time, determining the working state of the energy storage converter according to the dc bus voltage, and determining the charging and discharging stable voltage includes:
when the direct current bus voltage is within a first preset threshold range, the energy storage converter is in a charging state, and charging stable voltage is determined;
and when the voltage of the direct current bus is within a second preset threshold range, the energy storage converter is in a discharging state, and the discharging stable voltage is determined.
According to an embodiment of the present invention, the step of calculating the charging and discharging power of the energy storage converter according to the dc bus voltage and the charging and discharging stable voltage based on the PID regulator includes:
calculating the error between the DC bus voltage and the charging and discharging stable voltage;
and calculating the charge and discharge power of the energy storage converter according to the error based on a PID regulator.
According to an embodiment of the present invention, the step of calculating the error between the dc bus voltage and the charging and discharging stable voltage includes:
the error is calculated according to the following equation:
wherein, when the energy storage converter is in a charging state,
when the energy storage converter is in a discharging state for the error between the DC bus voltage and the charging stable voltage,
for the error between the dc bus voltage and the discharge stabilization voltage,
is the charging stabilization voltage or the discharging stabilization voltage,
is the dc bus voltage.
According to an embodiment of the present invention, the step of calculating the charging and discharging power of the energy storage converter according to the error based on the PID regulator includes:
when the energy storage converter is in a charging state, the charging power of the energy storage converter is calculated according to the following formula,
wherein, in the step (A),
for the charging power of the energy storage converter,
for the error between the dc bus voltage and the charging stabilization voltage,
is a first proportional constant, and is,
is a first constant of integration, and is,
is a first differential constant, and t is time.
According to an embodiment of the present invention, the step of calculating the charging and discharging power of the energy storage converter according to the error based on the PID regulator includes:
when the energy storage converter is in a discharging state, the discharging power of the energy storage converter is calculated according to the following formula,
wherein, in the step (A),
is the discharge power of the energy storage converter,
to the DC busThe error between the voltage and the discharge stabilization voltage,
is a second constant of proportionality that,
is a second integration constant which is a function of,
is a second differential constant, and t is time.
According to an embodiment of the present invention, after the step of obtaining the dc bus voltage in real time, determining the working state of the energy storage converter according to the dc bus voltage, and determining the charging/discharging stable voltage, the method further includes:
judging whether the flywheel energy storage device is in a chargeable and dischargeable state;
when the energy storage converter is in a charging state, if the flywheel energy storage device is in a chargeable state, calculating the charging power of the energy storage converter, and if the flywheel energy storage device is in a non-chargeable state, the charging and discharging power of the energy storage converter is zero;
when the energy storage converter is in a discharging state, if the flywheel energy storage device is in a dischargeable state, the discharging power of the energy storage converter is calculated, and if the flywheel energy storage device is in a non-dischargeable state, the charging and discharging power of the energy storage converter is zero.
According to an embodiment of the present invention, before the step of obtaining the dc bus voltage in real time, determining the working state of the energy storage converter according to the dc bus voltage, and determining the charging/discharging stable voltage, the method further includes:
acquiring direct current side voltage and direct current side current of the energy storage converter in real time, and calculating direct current side power of the energy storage converter according to the direct current side voltage and the direct current side current of the energy storage converter;
and when the direct current side power is within a preset direct current side power range, acquiring direct current bus voltage in real time, judging the working state of the energy storage converter according to the direct current bus voltage and determining charging and discharging stable voltage.
According to an embodiment of the present invention, before the step of obtaining the dc bus voltage in real time, determining the working state of the energy storage converter according to the dc bus voltage, and determining the charging/discharging stable voltage, the method further includes:
acquiring alternating-current side voltage and alternating-current side current of the energy storage converter in real time, and calculating alternating-current side power of the energy storage converter according to the alternating-current side voltage and the alternating-current side current of the energy storage converter;
when the AC side power is within a preset AC side power range, acquiring the DC bus voltage in real time, judging the working state of the energy storage converter according to the DC bus voltage and determining the charging and discharging stable voltage.
According to an embodiment of the invention, the method further comprises:
receiving a control instruction and a charging and discharging instruction power of the superior control system, wherein the charging and discharging instruction power comprises a charging instruction power and a discharging instruction power;
judging whether the flywheel energy storage device is in a chargeable and dischargeable state;
when the flywheel energy storage device is in a chargeable state, controlling the charging power of the flywheel energy storage device to be the charging instruction power according to the control instruction;
and when the flywheel energy storage device is in a dischargeable state, controlling the discharge power of the flywheel energy storage device to be the discharge instruction power according to the control instruction.
The invention has the beneficial effects that: the flywheel energy storage device is coupled with the energy storage converter through the direct-current bus without communication connection, the flywheel energy storage device is charged and discharged according to charging and discharging instructions of a superior control system, the energy storage converter adjusts charging and discharging power in a self-adaptive mode according to the voltage of the direct-current bus, the problem that coordination control needs to be carried out between the flywheel energy storage device and the energy storage converter through communication is solved, control complexity is simplified, and charging and discharging response speed and charging and discharging power accuracy are improved.
Drawings
FIG. 1 is a schematic structural diagram of a cooperative charging and discharging control system of a flywheel energy storage device and an energy storage converter according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a cooperative charging and discharging control method for a flywheel energy storage device and an energy storage converter according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a power regulation control flow of an energy storage converter according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of controlling charging and discharging of the energy storage converter according to the embodiment of the invention;
FIG. 5 is a schematic flow chart of a cooperative charging and discharging control method for a flywheel energy storage device and an energy storage converter according to a second embodiment of the present invention;
fig. 6 is a schematic view of a charge and discharge control process of the flywheel energy storage device according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first", "second" and "third" in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. All directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Fig. 1 is a schematic structural diagram of a cooperative charge and discharge control system of a flywheel energy storage device and an energy storage converter according to an embodiment of the present invention. Referring to fig. 1, the cooperative charging and discharging control system for the flywheel energy storage device and the energy storage converter includes: the energy storage converter comprises energy storage converters 10 and flywheel energy storage devices 20, wherein the energy storage converters 10 are connected with the flywheel energy storage devices 20 through direct current buses 30, one energy storage converter 10 can be connected with a plurality of flywheel energy storage devices 20 through the direct current buses 30, direct current bus voltage is established by the energy storage converters 10, and the flywheel energy storage devices 20 are connected with a superior control system 40.
Further, the energy storage converter 10 includes a power module 11 and a PCS controller 12 connected to the power module 11, wherein an ac side of the power module 11 is connected to an external ac system, and a dc side of the power module 11 is connected to a dc bus 30. The flywheel energy storage device 20 comprises a flywheel controller 21, a flywheel converter 22 connected with the flywheel controller 21, an alternating current motor 23 and a flywheel 24, wherein the direct current side of the flywheel converter 22 is connected with a direct current bus 30, and the alternating current side of the flywheel converter 22 is connected with the alternating current motor 23.
The flywheel controller 21 is in communication connection with the PCS controller 12, and the flywheel controller 21 sends main information to the PCS controller 12, including: state information of flywheel energy storage device 20, state of charge of flywheel energy storage device 20; the main information sent by the PCS controller 12 to the flywheel controller 21 includes: status information of the energy storage converter 10. The flywheel controller 21 is in communication connection with the upper control system 40, and the main information sent by the flywheel controller 21 to the upper control system 40 includes: the state information of the flywheel energy storage device 20, the electric quantity state of the flywheel energy storage device 20 and the state information of the energy storage converter 10; the main information sent by the upper control system 40 to the flywheel controller 21 includes: a charge or discharge command. In this embodiment, the state information of the flywheel energy storage device 20 includes a self-test state, a charge-discharge state, a dc-side voltage, a dc-side current, and a dc-side power, and the state information of the energy storage converter 10 includes a self-test state, an ac-side voltage, an ac-side current, an ac-side power, a dc-side voltage, a dc-side current, and a dc-side power.
Fig. 2 is a schematic flow chart of a cooperative charging and discharging control method of a flywheel energy storage device and an energy storage converter according to a first embodiment of the present invention. It should be noted that the method of the present invention is not limited to the flow sequence shown in fig. 2 if the results are substantially the same. As shown in fig. 2, the method is applied to an energy storage converter, and includes:
step S201: and acquiring the direct-current bus voltage in real time, judging the working state of the energy storage converter according to the direct-current bus voltage and determining the charging and discharging stable voltage.
In step S201, when the dc bus voltage is within a first preset threshold range, the energy storage converter is in a charging state, and a charging stabilization voltage is determined; and when the voltage of the direct current bus is within a second preset threshold range, the energy storage converter is in a discharging state, and the discharging stable voltage is determined. In this embodiment, the charging start value of the dc bus voltage is set to Uc0, the charging stabilization voltage of the dc bus voltage is set to Uc1, and the lowest charging voltage of the dc bus voltage is set to Uc 2; setting the initial discharge value of the direct current bus voltage as Ud0, the discharge stable voltage of the direct current bus voltage as Ud1 and the lowest discharge voltage of the direct current bus voltage as Ud2, wherein Uc2< Uc1< Uc0< Ud0< Ud1< Ud 2.
When the DC bus voltage
When the voltage is equal to or more than U0 (t) and equal to or more than U0, or U (t) and equal to or more than U2, or U (t) and equal to or more than U2, the energy storage converter is in a standby state and is not charged or discharged; when the DC bus voltage
At Uc2<U(t)<When the voltage is Uc0, the energy storage converter is in a charging state, and the direct-current bus voltage is stabilized at a charging stable voltage Uc1 by adjusting charging power; when the DC bus voltage
At Ud0<U(t)<And when the voltage is Ud2, the energy storage converter is in a discharging state, and the direct-current bus voltage is stabilized at a discharging stable voltage Ud1 by adjusting the discharging power.
Further, in this embodiment, after step S201 and before step S202, the method further includes determining whether the flywheel energy storage device is in a chargeable and dischargeable state; when the energy storage converter is in a charging state, if the flywheel energy storage device is in a chargeable state, executing step S202, calculating the charging power of the energy storage converter, and if the flywheel energy storage device is in a non-chargeable state, the charging and discharging power of the energy storage converter is zero; when the energy storage converter is in a discharging state, if the flywheel energy storage device is in a dischargeable state, step S202 is executed to calculate the discharging power of the energy storage converter, and if the flywheel energy storage device is in a non-dischargeable state, the charging and discharging power of the energy storage converter is zero.
In another embodiment, before step S201, the method further includes obtaining a dc-side voltage and a dc-side current of the energy storage converter in real time, and calculating a dc-side power of the energy storage converter according to the dc-side voltage and the dc-side current of the energy storage converter; when the direct current side power is within a preset direct current side power range, acquiring the alternating current side voltage and the alternating current side current of the energy storage converter in real time, and calculating the alternating current side power of the energy storage converter according to the alternating current side voltage and the alternating current side current of the energy storage converter; when the ac-side power is within the preset ac-side power range, step S201 is performed.
Step S202: and based on the PID regulator, calculating the charge and discharge power of the energy storage converter according to the DC bus voltage and the charge and discharge stable voltage.
In step S202, first, an error between the dc bus voltage and the charge/discharge stable voltage is calculated. The error is calculated according to the following equation:
wherein, when the energy storage converter is in a charging state,
when the energy storage converter is in a discharging state due to the error between the DC bus voltage and the charging stable voltage,
is the error between the DC bus voltage and the discharge stabilization voltage,
for the charging stabilization voltage or the discharging stabilization voltage,
is the dc bus voltage.
And then, based on the PID regulator, calculating the charging and discharging power of the energy storage converter according to the error.
When the energy storage converter is in a charging state, the charging power of the energy storage converter is calculated according to the following formula,
wherein, in the step (A),
the dimension of the charging power of the energy storage converter is watt (W),
is a direct currentThe error between the bus voltage and the charging stabilization voltage is measured in volts (V),
is a first proportionality constant, measured in amperes (A),
is a first integral constant having a dimension of A.s-1，
Is the first differential constant, dimension A.s, t is time, and dimension seconds(s).
When the energy storage converter is in a discharging state, the discharging power of the energy storage converter is calculated according to the following formula,
wherein, in the step (A),
the dimension of the discharge power of the energy storage converter is watt (W),
the error between the DC bus voltage and the discharge stable voltage is measured in volts (V),
is a second constant of proportionality in amperes (A),
is a second integral constant having a dimension of A.s-1，
Is the second differential constant, dimension A.s, t is time, and dimension seconds(s).
When the energy storage converter is in a standby state, the charging and discharging power of the energy storage converter is zero, and neither charging nor discharging is performed.
Step S203: and performing charging and discharging operation according to the charging and discharging power so that the direct-current side voltage of the energy storage converter is the charging and discharging stable voltage.
In step S203, the energy storage converter controls the power module thereof to perform charging and discharging operations according to the calculated charging and discharging power, so that the dc side voltage of the energy storage converter is a charging and discharging stable voltage.
Specifically, as shown in fig. 3, a power regulation control flow of the energy storage converter first obtains a voltage error according to the charging and discharging stable voltage and the dc bus voltage, the PID regulator calculates the charging and discharging power of the energy storage converter based on the voltage error, and the power module performs power regulation according to the calculated charging and discharging power.
Specifically, in one embodiment, the energy storage converter controls the charging and discharging process as shown in fig. 4,
step S401 is first executed: acquiring the direct current side voltage and the direct current side current of the energy storage converter in real time, calculating the direct current side power of the energy storage converter according to the direct current side voltage and the direct current side current of the energy storage converter, and executing the step S402 when the direct current side power is within a preset direct current side power range: acquiring alternating-current side voltage and alternating-current side current of the energy storage converter in real time, and calculating alternating-current side power of the energy storage converter according to the alternating-current side voltage and the alternating-current side current of the energy storage converter; when the ac-side power is within the preset ac-side power range, step S403 is performed: judging whether the direct current bus voltage is larger than the lowest charging voltage and smaller than a charging starting value, namely Uc2< U (t) < Uc0, if so, executing step S404, otherwise, executing step S405, and step S404: judging whether the flywheel energy storage device is in a chargeable state, when the flywheel energy storage device is in the chargeable state, calculating the charging power of the energy storage converter according to a corresponding formula, executing the charging operation and executing the step S401 again, when the flywheel energy storage device is in a non-chargeable state, the charging and discharging power is 0, and the energy storage converter executes the standby operation and executes the step S401 again; step S405: judging whether the direct current bus voltage is greater than a discharging initial value and smaller than the lowest charging voltage, namely Ud0< U (t) < Ud2, if so, executing step S406, otherwise, the charging and discharging power is 0, and the energy storage converter executes standby operation and executes step S401 again; step S406: and judging whether the flywheel energy storage device is in a dischargeable state, when the flywheel energy storage device is in the dischargeable state, calculating the discharge power of the energy storage converter according to a corresponding formula, executing the discharge operation and executing the step S401 again, when the flywheel energy storage device is in a non-dischargeable state, the charge and discharge power is 0, and the energy storage converter executes the standby operation and executes the step S401 again.
Fig. 5 is a flowchart illustrating a cooperative charging and discharging control method for a flywheel energy storage device and an energy storage converter according to a second embodiment of the present invention. It should be noted that the method of the present invention is not limited to the flow sequence shown in fig. 5 if the results are substantially the same. As shown in fig. 5, the method is applied to a flywheel energy storage device, and includes:
step S501: and receiving a control instruction and a charging and discharging instruction power of the superior control system, wherein the charging and discharging instruction power comprises the charging instruction power and the discharging instruction power.
Step S502: and judging whether the flywheel energy storage device is in a chargeable and dischargeable state or not.
In step S502, when the flywheel energy storage device is in the chargeable state, step S503 is executed, and when the flywheel energy storage device is in the dischargeable state, step S504 is executed.
Step S503: and controlling the charging power of the flywheel energy storage device to be the charging instruction power according to the control instruction.
Step S504: and controlling the discharge power of the flywheel energy storage device to be the discharge instruction power according to the control instruction.
In a preferred embodiment, please refer to fig. 6, step S601: the flywheel controller monitors the direct current side voltage and current of the flywheel converter in real time, calculates the direct current side power of the flywheel converter according to the direct current side voltage and current, and executes the step S602 when the direct current side power of the flywheel converter is within a preset threshold range: the flywheel controller receives a control command and charging and discharging command power sent by a superior control system; then, step S603 is performed: determining whether the control command is a charging command, and if the control command is a charging command, executing step S604: judging whether the flywheel energy storage device is in a chargeable state, if the control instruction is not a charging instruction, executing the step S605: determining whether the control command is a discharge command, and if the control command is a discharge command, executing step S606: and judging whether the flywheel energy storage device is in a dischargeable state, if the control instruction is not a discharge instruction, the charging and discharging power of the flywheel converter is zero, and the flywheel converter executes standby operation and executes the step S601 again. In step S604, if the flywheel energy storage device is in a chargeable state, the flywheel converter performs a charging operation and re-performs step S601, where the charging power is a charging command power; if the flywheel energy storage device is in the non-chargeable state, the flywheel converter executes the standby operation and executes the step S601 again, and the charging and discharging power is zero. In step S606, if the flywheel energy storage device is in a dischargeable state, the flywheel converter performs a discharging operation and re-performs step S601, where the discharging power is a discharging instruction power; if the flywheel energy storage device is in the non-dischargeable state, the flywheel converter executes standby operation and executes step S601 again, and the charging and discharging power is zero.
According to the cooperative charge and discharge control method of the flywheel energy storage device and the energy storage converter, the flywheel energy storage device is used for charging and discharging according to the charge and discharge instruction of the superior control system, the energy storage converter is used for adaptively adjusting the charge and discharge power according to the voltage of the direct current bus, the flywheel energy storage device and the energy storage converter are simply and reliably matched, the problem that the flywheel energy storage device and the energy storage converter need to be coordinately controlled through communication is solved, the control complexity is simplified, and the charge and discharge response speed and the charge and discharge power precision are improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A cooperative charging and discharging control method for a flywheel energy storage device and an energy storage converter is characterized in that the energy storage converter is connected with the flywheel energy storage device through a direct current bus, and the flywheel energy storage device is connected with a superior control system, and the method comprises the following steps:
acquiring direct-current bus voltage in real time, judging the working state of the energy storage converter according to the direct-current bus voltage and determining charging and discharging stable voltage;
based on a PID regulator, calculating the charge and discharge power of the energy storage converter according to the direct current bus voltage and the charge and discharge stable voltage;
performing charging and discharging operation according to the charging and discharging power so that the direct-current side voltage of the energy storage converter is the charging and discharging stable voltage;
receiving a control instruction and a charging and discharging instruction power of the superior control system, wherein the charging and discharging instruction power comprises a charging instruction power and a discharging instruction power;
judging whether the flywheel energy storage device is in a chargeable and dischargeable state;
when the flywheel energy storage device is in a chargeable state, controlling the charging power of the flywheel energy storage device to be the charging instruction power according to the control instruction;
and when the flywheel energy storage device is in a dischargeable state, controlling the discharge power of the flywheel energy storage device to be the discharge instruction power according to the control instruction.
2. The method according to claim 1, wherein the step of obtaining the dc bus voltage in real time, determining the operating state of the energy storage converter according to the dc bus voltage, and determining the charging/discharging stable voltage comprises:
when the direct current bus voltage is within a first preset threshold range, the energy storage converter is in a charging state, and charging stable voltage is determined;
and when the voltage of the direct current bus is within a second preset threshold range, the energy storage converter is in a discharging state, and the discharging stable voltage is determined.
3. The method according to claim 2, wherein the step of calculating the charging and discharging power of the energy storage converter according to the direct current bus voltage and the charging and discharging stable voltage based on the PID regulator comprises:
calculating the error between the DC bus voltage and the charging and discharging stable voltage;
and calculating the charge and discharge power of the energy storage converter according to the error based on a PID regulator.
4. The method of claim 3, wherein the step of calculating the error between the DC bus voltage and the charging and discharging regulated voltage comprises:
the error is calculated according to the following equation:
wherein, when the energy storage converter is in a charging state,
when the energy storage converter is in a discharging state for the error between the DC bus voltage and the charging stable voltage,
for the error between the dc bus voltage and the discharge stabilization voltage,
is the charging stabilization voltage or the discharging stabilization voltage,
is the dc bus voltage.
5. The method according to claim 4, wherein the step of calculating the charging and discharging power of the energy storage converter according to the error based on the PID regulator comprises:
when the energy storage converter is in a charging state, the charging power of the energy storage converter is calculated according to the following formula,
wherein, in the step (A),
for the charging power of the energy storage converter,
for the error between the dc bus voltage and the charging stabilization voltage,
is a first proportional constant, and is,
is a first constant of integration, and is,
is a first differential constant, and t is time.
6. The method according to claim 4, wherein the step of calculating the charging and discharging power of the energy storage converter according to the error based on the PID regulator comprises:
when the energy storage converter is in a discharging state, the discharging power of the energy storage converter is calculated according to the following formula,
wherein, in the step (A),
is the discharge power of the energy storage converter,
for the error between the dc bus voltage and the discharge stabilization voltage,
is a second constant of proportionality that,
is a second integration constant which is a function of,
is a second differential constant, and t is time.
7. The method according to claim 2, wherein after the steps of obtaining the dc bus voltage in real time, determining the operating state of the energy storage converter according to the dc bus voltage, and determining the charging/discharging stable voltage, the method further comprises:
judging whether the flywheel energy storage device is in a chargeable and dischargeable state;
when the energy storage converter is in a charging state, if the flywheel energy storage device is in a chargeable state, calculating the charging power of the energy storage converter, and if the flywheel energy storage device is in a non-chargeable state, the charging and discharging power of the energy storage converter is zero;
when the energy storage converter is in a discharging state, if the flywheel energy storage device is in a dischargeable state, the discharging power of the energy storage converter is calculated, and if the flywheel energy storage device is in a non-dischargeable state, the charging and discharging power of the energy storage converter is zero.
8. The method according to claim 1, wherein before the steps of obtaining the dc bus voltage in real time, determining the operating state of the energy storage converter according to the dc bus voltage, and determining the charging/discharging stable voltage, the method further comprises:
acquiring direct current side voltage and direct current side current of the energy storage converter in real time, and calculating direct current side power of the energy storage converter according to the direct current side voltage and the direct current side current of the energy storage converter;
and when the direct current side power is within a preset direct current side power range, acquiring direct current bus voltage in real time, judging the working state of the energy storage converter according to the direct current bus voltage and determining charging and discharging stable voltage.
9. The method according to claim 8, wherein before the steps of obtaining the dc bus voltage in real time, determining the operating state of the energy storage converter according to the dc bus voltage, and determining the charging/discharging stable voltage, the method further comprises:
acquiring alternating-current side voltage and alternating-current side current of the energy storage converter in real time, and calculating alternating-current side power of the energy storage converter according to the alternating-current side voltage and the alternating-current side current of the energy storage converter;
when the AC side power is within a preset AC side power range, acquiring the DC bus voltage in real time, judging the working state of the energy storage converter according to the DC bus voltage and determining the charging and discharging stable voltage.
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