CN116418123A - Flywheel energy storage unit control method and device and wind generating set - Google Patents

Flywheel energy storage unit control method and device and wind generating set Download PDF

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Publication number
CN116418123A
CN116418123A CN202111651378.4A CN202111651378A CN116418123A CN 116418123 A CN116418123 A CN 116418123A CN 202111651378 A CN202111651378 A CN 202111651378A CN 116418123 A CN116418123 A CN 116418123A
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reference value
value
energy storage
storage unit
current
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曹晓东
刘世军
俞黎萍
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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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
    • 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
    • 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
    • H02J3/381—Dispersed generators
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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

Abstract

A control method and device for a flywheel energy storage unit and a wind generating set are provided. The flywheel energy storage unit is connected to a direct current bus of a converter of a wind generating set via a first machine side three-phase power module, and the control method comprises the following steps: determining a first passive current reference value based on a motor voltage feedback value and a weak voltage set value of the flywheel energy storage unit; determining a first active current reference value based on an active power reference value and an active power feedback value of the flywheel energy storage unit; determining a first voltage reference value based on a first active current reference value, and a motor current value of the flywheel energy storage unit; and controlling the first machine side three-phase power module based on the first voltage reference value, so as to control the charge and discharge of the flywheel energy storage unit.

Description

Flywheel energy storage unit control method and device and wind generating set
Technical Field
The present disclosure relates generally to the field of power technology, and more particularly, to a method and apparatus for controlling a flywheel energy storage unit, and a wind turbine generator set.
Background
Currently, the wind farm grid connection is required to have the functions of inertia response, primary frequency modulation, power smoothing, secondary frequency modulation and the like, and in order to enable a wind generating set (hereinafter, also simply referred to as a fan) to have the functions on the premise that normal power generation is not affected, an energy storage unit with power of 10% -20% Pn (Pn is the rated power of the fan) needs to be configured for the fan. The flywheel has the remarkable advantages of long service life, no pollution, quick response, safety, low cost, easy recovery and the like, and has remarkable advantages when being used as a fan energy storage unit.
At present, a fan system and a flywheel energy storage system are realized through alternating current parallel connection and are respectively provided with an independent grid-connected converter, and the flywheel energy storage system generally receives control instructions of a fan or a station in a communication mode to realize charge and discharge control. That is, the flywheel inverter control and the fan inverter control are independent of each other, and the flywheel control strategy in this case may be: on the one hand, flywheel charging control: DC voltage stabilization is realized by the inversion of the net side of the flywheel converter, and flywheel charging is realized by the machine side of the flywheel converter through rotation speed control; flywheel discharge control, on the other hand: the side rectification of the flywheel converter realizes direct current voltage stabilization, and the grid side realizes grid-connected output through inversion control.
However, aiming at the two cases of the parallel connection mode of the direct current bus of the fan system and the flywheel energy storage system and the integrated design of the converter of the fan system and the flywheel energy storage system, the flywheel energy storage system and the fan system have the electric strong coupling relationship of the direct current bus, so that the charge and discharge control of the flywheel energy storage cannot be realized according to the existing flywheel energy storage control method.
Disclosure of Invention
The embodiment of the disclosure provides a control method and device of a flywheel energy storage unit and a wind generating set, which can effectively control charge and discharge of the flywheel energy storage unit in a scene that the flywheel energy storage unit and a wind generator have an electric strong coupling relation of a direct current bus.
According to a first aspect of embodiments of the present disclosure, there is provided a control method of a flywheel energy storage unit connected to a dc bus of a converter of a wind power generator set via a first-side three-phase power module, wherein the control method comprises: determining a first passive current reference value based on a motor voltage feedback value and a weak voltage set value of the flywheel energy storage unit; determining a first active current reference value based on an active power reference value and an active power feedback value of the flywheel energy storage unit; determining a first voltage reference value based on a first active current reference value, and a motor current value of the flywheel energy storage unit; and controlling the first machine side three-phase power module based on the first voltage reference value, so as to control the charge and discharge of the flywheel energy storage unit.
According to a second aspect of embodiments of the present disclosure, there is provided a control device of a flywheel energy storage unit connected to a dc bus of a converter of a wind power generator set via a first-side three-phase power module, wherein the control device comprises: the weak magnetic control unit is configured to determine a first passive current reference value based on a motor voltage feedback value and a weak magnetic voltage set value of the flywheel energy storage unit; a power control unit configured to determine a first active current reference value based on an active power reference value and an active power feedback value of the flywheel energy storage unit; a current control unit configured to determine a first voltage reference value based on a first active current reference value, the first active current reference value, and a motor current value of the flywheel energy storage unit; and the power module control unit is configured to control the first machine side three-phase power module based on the first voltage reference value so as to control the charge and discharge of the flywheel energy storage unit.
According to a third aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the method of controlling a flywheel energy storage unit as described above.
According to a fourth aspect of embodiments of the present disclosure, there is provided a controller of a current transformer, the controller comprising: a processor; and a memory storing a computer program which, when executed by the processor, causes the processor to perform the method of controlling the flywheel energy storage unit as described above.
According to a fifth aspect of embodiments of the present disclosure, there is provided a wind power plant comprising a controller of a converter as described above.
The technical scheme provided by the embodiment of the disclosure at least brings the following beneficial effects: the method can effectively, conveniently and real-time control the charge and discharge of the flywheel energy storage unit under the condition that the flywheel energy storage unit and the fan generator have the electric strong coupling relation of the direct current bus. In addition, the charge and discharge of the flywheel energy storage unit can be realized in the same control mode, the mode switching is not needed, and the response performance is improved.
In addition, the flywheel control strategy and the fan control strategy are fused, so that the control strategy of the flywheel motor generator is the same as that of the fan generator, and the machine side unified control mode enables the controller to be simple in design, high in efficiency and high in reusability.
Additional aspects and/or advantages of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
Drawings
The foregoing and other objects and features of exemplary embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate the embodiments by way of example, in which:
FIG. 1 illustrates a flowchart of a method of controlling a flywheel energy storage unit according to an exemplary embodiment of the present disclosure;
FIG. 2 illustrates an example of a topology with a fan system and a DC bus of a flywheel energy storage system connected in parallel according to an exemplary embodiment of the present disclosure;
FIG. 3 illustrates an example of a topology with a fan system and a current transformer of a flywheel energy storage system integrated according to an exemplary embodiment of the present disclosure;
FIG. 4 illustrates a control logic block diagram of a flywheel energy storage unit according to an exemplary embodiment of the present disclosure;
fig. 5 illustrates a flowchart of a control method of a grid-side three-phase power module according to an exemplary embodiment of the present disclosure;
fig. 6 shows a block diagram of a control device of a flywheel energy storage unit according to an exemplary embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments will be described below in order to explain the present disclosure by referring to the figures.
For the electric strong coupling relation of the direct current bus in the flywheel energy storage system and the fan system in the background art, the disclosure provides a control method of the flywheel energy storage unit, and the control method can effectively control the charge and discharge of the flywheel energy storage unit when the flywheel energy storage system and the fan system are in strong coupling connection.
Fig. 1 shows a flowchart of a control method of a flywheel energy storage unit according to an exemplary implementation of the present disclosure.
The flywheel energy storage unit is connected to a direct current bus of a converter of the wind generating set via the first machine side three-phase power module. Specifically, the dc terminal of the first-side three-phase power module is connected to the dc bus, and the ac terminal of the first-side three-phase power module is connected to a motor generator (hereinafter referred to as a motor) of the flywheel energy storage unit, for example, the ac terminal of the first-side three-phase power module is connected to the motor of the flywheel energy storage unit via a filter. The first machine side three-phase power module is used for controlling a motor generator of the flywheel energy storage unit.
As an example, the motor generator of the flywheel energy storage unit may be a synchronous motor.
As an example, the flywheel energy storage unit and the wind generating set share the same network side three-phase power module. The direct current bus of the converter of the wind generating set is connected to a power grid through the grid-side three-phase power module, and the grid-side three-phase power module is used for achieving grid connection control.
As an example, the connection relationship between the flywheel energy storage unit and the wind turbine may be as shown in fig. 2 (the fan system and the dc bus of the flywheel energy storage system are connected in parallel) or fig. 3 (the fan system and the converter of the flywheel energy storage system are integrated). It should be understood that the connection relationship between the flywheel energy storage unit and the wind turbine is not limited thereto, and the present disclosure is not limited thereto.
As an example, the control method of the flywheel energy storage unit according to the exemplary embodiment of the present disclosure may be performed by the controller of the converter of the wind power generation set, or may be performed by the controller of the converter of the flywheel energy storage unit.
Referring to fig. 1 in combination with fig. 4, in step S10, a first active current reference value is determined based on a motor voltage feedback value and a weak voltage set point of the flywheel energy storage unit.
As an example, step S10 may be performed by a weak magnetic loop (corresponding to the weak magnetic control module in fig. 4, for example, may be implemented by a PID controller), which is used to control the motor terminal voltage of the flywheel energy storage unit. U (U) max Represents the set point of the weak magnetic voltage (namely, the target value of the weak magnetic voltage), U meas Representing the motor voltage feedback value (i.e., the actual motor voltage value) of the flywheel energy storage unit.
As an example, the motor voltage feedback value of the flywheel energy storage unit may be: and obtaining a line voltage effective value based on the three-phase voltage value of the motor of the flywheel energy storage unit.
As shown in FIG. 4, u fa Representing flywheel motor generator a phase voltage; u (u) fb Representing flywheel motor generator B-phase voltage; u (u) fc Representing the flywheel motor generator C-phase voltage.
In step S20, a first active current reference value is determined based on the active power reference value and the active power feedback value of the flywheel energy storage unit.
As an example, step S20 may be performed by a power loop (corresponding to the power control module in fig. 4, which may be implemented by a PID controller, for example) for active power control. P (P) ref Representing the active power reference value (i.e., the active power target value) of the flywheel energy storage unit, P meas Representing the active power feedback value (i.e., the actual active power value) of the flywheel energy storage unit.
For controlling flywheel energy storage unit, P ref In order to be positive, realize the discharge of the flywheel energy storage unit, P ref And when the energy storage unit is negative, the flywheel energy storage unit is charged. According to the method and the device, the charge and discharge of the flywheel energy storage unit can be realized in the same control mode, the mode switching is not needed, and the response performance is improved.
As an example, the above-mentioned active power reference value may be obtained based on an inertia response power support command or a chirped power support command of the wind turbine generator system.
As an example, the active power feedback value of the flywheel energy storage unit is the active power value of the dc end of the first-side three-phase power module.
In step S30, a first voltage reference value is determined based on the first active current reference value, and the motor current value of the flywheel energy storage unit.
As an example, a motor reactive current value and a motor active current value are determined based on motor three-phase current values of the flywheel energy storage unit, and then a first voltage reference value is determined based on the first active current reference value, and the motor reactive current value and the motor active current value.
As shown in fig. 4, i fa Representing the A-phase current of the flywheel motor generator, i fb Representing the B-phase current of the flywheel motor generator, i fc Representing flywheel motor generator C-phase current, id representing motor reactive current, iq representing motor active current.
As an example, the three-phase current value of the motor of the flywheel energy storage unit is converted into a two-phase current value, then, based on the two-phase current value, the position angle of the motor rotor of the flywheel energy storage unit is estimated, the two-phase current value is converted, and a d-axis current component and a q-axis current component under a two-phase rotation coordinate system are obtained, and are respectively used as a reactive current value and an active current value of the motor.
As shown in FIG. 4, the three-phase current values of the motor of the flywheel energy storage unit are converted into two-phase current values by Clark conversion (3 s/2 s), and then the two-phase current values are converted by Park conversion (2 s/2 r)The values are converted into a motor reactive current value and a motor active current value. And estimating a motor rotor position angle θ of the flywheel energy storage unit based on the two-phase current values m For example, the rotor position estimation module RPE may be used to derive the motor rotor position angle θ m 。
As an example, when transforming the motor three-phase current values, the motor three-phase current values of the flywheel energy storage unit may be transformed into two-phase current values using the last estimated motor rotor position angle of the flywheel energy storage unit.
As an example, the step of determining the first voltage reference value based on the first active current reference value, and the motor reactive current value and the motor active current value may comprise: the d-axis voltage reference value and the q-axis voltage reference value are determined based on the first active current reference value, the motor reactive current value, and the motor active current value. For example, this step may be performed by the current loop in FIG. 4 (e.g., may be implemented by a PID controller), U ref_d Represents the d-axis voltage reference value of the motor, U ref_q Representing the motor q-axis voltage reference.
In step S40, the first-side three-phase power module is controlled based on the first voltage reference value, thereby controlling charge and discharge of the flywheel energy storage unit. Specifically, based on the first voltage reference value, the first-side three-phase power module is controlled to control the motor generator of the flywheel energy storage unit by the first-side three-phase power module, thereby realizing charge and discharge control of the flywheel energy storage unit.
As an example, the estimated motor rotor position angle θ may be based on m And transforming (e.g. performing Park inverse transformation) the determined d-axis voltage reference value and q-axis voltage reference value to obtain two-phase voltage values under a two-phase stationary coordinate system, generating a PWM pulse control signal for controlling the first-side three-phase power module based on the two-phase voltage values by using space vector modulation SVPWM, and transmitting the generated PWM pulse control signal to the first-side three-phase power module.
According to the method and the device, under the condition that the flywheel energy storage unit and the fan generator have the electric strong coupling relation of the direct current bus, the charge and discharge of the flywheel energy storage unit can be effectively, conveniently and real-time controlled.
The control method of the flywheel energy storage unit of the wind generating set according to the exemplary embodiment of the present disclosure may further include: steps S50, S60, S70, S80 shown in fig. 5.
Referring to fig. 5 in combination with fig. 4, a second active current reference value is determined based on the voltage feedback value and the voltage reference value of the dc bus at step S50.
As an example, step S50 may be performed by a dc voltage loop (corresponding to the voltage control module in fig. 4, for example, may be implemented by a PID controller) for controlling the stabilization of the dc bus voltage. Udc (u-dc) ref Representing a voltage reference value (i.e., a direct current bus voltage target value) of the direct current bus, udc meas Representing the voltage feedback value of the dc bus (i.e., the actual value of the dc bus voltage).
In step S60, a second reactive current reference value is determined based on the reactive power feedback value and the reactive power reference value of the wind park.
As an example, step S60 may be performed by a reactive loop (corresponding to the reactive control module in fig. 4, e.g. implemented by a PID controller) for controlling the reactive size according to the grid demand. Q (Q) ref Represents the reactive power reference value, Q meas Representing reactive power feedback values.
In step S70, a second voltage reference value is determined based on the second reactive current reference value, the second active current reference value, and the network-side three-phase current value.
As an example, step S70 may be performed by a current loop (e.g., may be implemented by a PID controller) as shown in fig. 4, I abc Representing three-phase current on the net side; v (V) abc Representing the three-phase voltage on the net side; c (C) DC Representing the dc support capacitance.
In step S80, the grid-side three-phase power module is controlled based on the second voltage reference value and the grid-side three-phase voltage value.
As an example, electricity obtained by the network-side three-phase voltage value may be based onNetwork phase angle theta g And transforming (e.g. performing Park inverse transformation) the determined second voltage reference value (comprising the d-axis voltage reference value and the q-axis voltage reference value) to obtain two-phase voltage values under a two-phase static coordinate system, generating a PWM pulse control signal for controlling the network-side three-phase power module based on the two-phase voltage values by using space vector modulation SVPWM, and transmitting the generated PWM pulse control signal to the network-side three-phase power module. For example, the grid phase angle θ can be obtained by a phase-locked loop PLL based on the grid-side three-phase voltage value g 。
Further, as an example, the generator of the wind power plant is connected to the converter dc bus via a second-side three-phase power module, the generator being controllable by: and determining a third reactive current reference value based on the voltage feedback value and the weak voltage set value of the generator, determining a third active current reference value based on the active power reference value and the active power feedback value of the generator, determining a third voltage reference value based on the third reactive current reference value, the third active current reference value and the current value of the generator, and controlling a second-side three-phase power module based on the third voltage reference value to control the fan generator. For a specific control manner, reference may be made to a control manner of the flywheel energy storage unit, which is not described herein.
The second machine side three-phase power module is used for realizing control of the fan generator. As an example, the fan generator may be a synchronous motor.
In FIG. 4, u ra Representing the A-phase voltage of the fan generator; u (u) rb Representing the B-phase voltage of the fan generator; u (u) rc Representing the C-phase voltage of the fan generator; i.e ra Representing the phase A current of the fan generator; i.e rb Representing the phase B current of the fan generator; i.e rc Representing the fan generator C-phase current.
According to the method and the device, the flywheel control strategy and the fan control strategy are fused, so that the control strategy of the flywheel motor generator is identical to that of the fan generator, and the machine side unified control mode enables the controller to be simple in design, high in efficiency and high in reusability.
Fig. 6 shows a block diagram of a control device of a flywheel energy storage unit according to an exemplary embodiment of the present disclosure. The flywheel energy storage unit is connected to a direct current bus of a converter of the wind generating set via the first machine side three-phase power module.
As shown in fig. 6, the control device of the flywheel energy storage unit includes: weak magnetic control unit 10, power control unit 20, current control unit 30 and power module control unit 40.
Specifically, the field weakening control unit 10 is configured to determine the first reactive current reference value based on the motor voltage feedback value and the field weakening voltage set value of the flywheel energy storage unit.
The power control unit 20 is configured to determine a first active current reference value based on the active power reference value and the active power feedback value of the flywheel energy storage unit.
The current control unit 30 is configured to determine a first voltage reference value based on the first active current reference value, and a motor current value of the flywheel energy storage unit.
The power module control unit 40 is configured to control the first-side three-phase power module based on the first voltage reference value, thereby controlling charge and discharge of the flywheel energy storage unit.
As an example, the current control unit 30 is configured to: and determining a motor reactive current value and a motor active current value based on the motor three-phase current value of the flywheel energy storage unit, and then determining a first voltage reference value based on the first active current reference value, and the motor reactive current value and the motor active current value.
As an example, the current control unit 30 is configured to: and secondly, estimating the position angle of a motor rotor of the flywheel energy storage unit based on the two-phase current values, and transforming the two-phase current values to obtain a d-axis current component and a q-axis current component under a two-phase rotating coordinate system, wherein the d-axis current component and the q-axis current component are used as the reactive current value and the active current value of the motor.
As an example, the current control unit 30 is configured to: the d-axis voltage reference value and the q-axis voltage reference value are determined based on the first active current reference value, the motor reactive current value, and the motor active current value.
As an example, the power module control unit 40 is configured to: and transforming the determined d-axis voltage reference value and q-axis voltage reference value based on the estimated motor rotor position angle to obtain two-phase voltage values under a two-phase stationary coordinate system, generating a PWM pulse control signal for controlling the first machine side three-phase power module based on the two-phase voltage values by utilizing space vector modulation, and finally transmitting the generated PWM pulse control signal to the first machine side three-phase power module.
As an example, the above-mentioned active power reference value may be obtained based on an inertia response power support command or a chirped power support command of the wind turbine generator system.
As an example, the motor voltage feedback value of the flywheel energy storage unit may be: and obtaining a line voltage effective value based on the three-phase voltage value of the motor of the flywheel energy storage unit.
As an example, the active power feedback value of the flywheel energy storage unit may be: the active power value of the direct current end of the three-phase power module of the first machine side.
As an example, the dc bus is connected to the power grid via a grid-side three-phase power module, and the control device may further include: a grid-side three-phase power module control unit (not shown in the figure) configured to: and determining a second active current reference value based on a voltage feedback value and a voltage reference value of the direct current bus, determining a second reactive current reference value based on a reactive power feedback value and a reactive power reference value of the wind generating set, determining a second voltage reference value based on the second reactive current reference value, the second active current reference value and a network side three-phase current value, and finally controlling the network side three-phase power module based on the second voltage reference value and the network side three-phase voltage value.
As an example, the generator of the wind power plant is connected to the dc bus via a second machine side three-phase power module, the generator being controlled by: and determining a third reactive current reference value based on the voltage feedback value and the weak voltage set value of the generator, determining a third active current reference value based on the active power reference value and the active power feedback value of the generator, determining a third voltage reference value based on the third reactive current reference value, the third active current reference value and the current value of the generator, and controlling the second-side three-phase power module based on the third voltage reference value.
It should be appreciated that specific processes performed by the control device of the flywheel energy storage unit according to the exemplary embodiment of the present disclosure have been described in detail with reference to fig. 1 to 5, and related details will not be repeated here.
It should be understood that each of the units in the control device of the flywheel energy storage unit according to the exemplary embodiments of the present disclosure may be implemented as hardware components and/or software components. The individual units may be implemented, for example, using a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), depending on the processing performed by the individual units as defined.
Exemplary embodiments of the present disclosure provide a computer readable storage medium storing a computer program, which when executed by a processor, causes the processor to perform the method of controlling a flywheel energy storage unit as described in the above exemplary embodiments. The computer readable storage medium is any data storage device that can store data which can be read by a computer system. Examples of the computer readable storage medium include: read-only memory, random access memory, compact disc read-only, magnetic tape, floppy disk, optical data storage device, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).
The controller of the current transformer according to an exemplary embodiment of the present disclosure includes: a processor (not shown) and a memory (not shown), wherein the memory stores a computer program which, when executed by the processor, causes the processor to perform the method of controlling the flywheel energy storage unit as described in the above exemplary embodiments. As an example, the controller of the converter may be a controller of a converter of a wind power plant or a controller of a converter of a flywheel energy storage unit.
In addition, the present disclosure also protects a wind generating set, which includes the controller of the converter, so that when the flywheel energy storage unit is strongly coupled with the dc bus of the converter of the wind generating set, the charging and discharging of the flywheel energy storage unit are controlled, and specific control logic is shown in fig. 1 to 5 and the text description thereof, and is not repeated here.
Although a few exemplary embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.

Claims (12)

1. A control method of a flywheel energy storage unit, characterized in that the flywheel energy storage unit is connected to a dc bus of a converter of a wind power generator set via a first machine side three-phase power module, wherein the control method comprises:
determining a first passive current reference value based on a motor voltage feedback value and a weak voltage set value of the flywheel energy storage unit;
determining a first active current reference value based on an active power reference value and an active power feedback value of the flywheel energy storage unit;
determining a first voltage reference value based on a first active current reference value, and a motor current value of the flywheel energy storage unit;
and controlling the first machine side three-phase power module based on the first voltage reference value, so as to control the charge and discharge of the flywheel energy storage unit.
2. The control method of claim 1, wherein the determining a first voltage reference value based on the first active current reference value, and the motor current value of the flywheel energy storage unit comprises:
determining a motor reactive current value and a motor active current value based on the motor three-phase current value of the flywheel energy storage unit;
the first voltage reference value is determined based on the first active current reference value, and the motor reactive current value and the motor active current value.
3. The control method according to claim 2, wherein the determining a motor reactive current value and a motor active current value based on the motor three-phase current value of the flywheel energy storage unit includes:
converting a three-phase current value of a motor of the flywheel energy storage unit into a two-phase current value;
estimating a motor rotor position angle of the flywheel energy storage unit based on the two-phase current values;
and transforming the two-phase current values to obtain a d-axis current component and a q-axis current component under a two-phase rotation coordinate system as the reactive current value and the active current value of the motor.
4. A control method according to claim 3, wherein the determining the first voltage reference value based on the first active current reference value, and the motor reactive current value and the motor active current value comprises:
the d-axis voltage reference value and the q-axis voltage reference value are determined based on the first active current reference value, the motor reactive current value, and the motor active current value.
5. The control method of claim 4, wherein controlling the first-side three-phase power module based on the first voltage reference value comprises:
based on the estimated motor rotor position angle, transforming the determined d-axis voltage reference value and q-axis voltage reference value to obtain two-phase voltage values under a two-phase stationary coordinate system;
generating a PWM pulse control signal for controlling the first-side three-phase power module based on the two-phase voltage values by using space vector modulation;
and sending the generated PWM pulse control signal to the first side three-phase power module.
6. The control method according to claim 1, wherein,
the active power reference value is obtained based on an inertia response power support instruction or a primary frequency modulation power support instruction of the wind generating set;
and/or, the motor voltage feedback value of the flywheel energy storage unit is: a line voltage effective value obtained based on the motor three-phase voltage value of the flywheel energy storage unit;
and/or, the active power feedback value of the flywheel energy storage unit is: the active power value of the direct current end of the three-phase power module of the first machine side.
7. The control method according to claim 1, wherein the direct current bus is connected to a power grid via a grid-side three-phase power module, wherein the control method further comprises:
determining a second active current reference value based on the voltage feedback value and the voltage reference value of the direct current bus;
determining a second reactive current reference value based on the reactive power feedback value and the reactive power reference value of the wind generating set;
determining a second voltage reference value based on the second reactive current reference value, the second active current reference value, and the grid-side three-phase current value;
and controlling the network side three-phase power module based on the second voltage reference value and the network side three-phase voltage value.
8. The control method according to claim 1, characterized in that a generator of the wind power plant is connected to the direct current bus via a second machine side three-phase power module, wherein the generator is controlled by:
determining a third reactive current reference value based on the voltage feedback value and the weak voltage set value of the generator;
determining a third active current reference value based on the active power reference value and the active power feedback value of the generator;
determining a third voltage reference value based on a third reactive current reference value, a third active current reference value, and a current value of the generator;
the second-side three-phase power module is controlled based on the third voltage reference value.
9. A control device of a flywheel energy storage unit, characterized in that the flywheel energy storage unit is connected to a dc bus of a converter of a wind power generator set via a first machine side three-phase power module, wherein the control device comprises:
the weak magnetic control unit is configured to determine a first passive current reference value based on a motor voltage feedback value and a weak magnetic voltage set value of the flywheel energy storage unit;
a power control unit configured to determine a first active current reference value based on an active power reference value and an active power feedback value of the flywheel energy storage unit;
a current control unit configured to determine a first voltage reference value based on a first active current reference value, the first active current reference value, and a motor current value of the flywheel energy storage unit;
and the power module control unit is configured to control the first machine side three-phase power module based on the first voltage reference value so as to control the charge and discharge of the flywheel energy storage unit.
10. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, causes the processor to perform the control method of the flywheel energy storage unit according to any one of claims 1 to 8.
11. A controller for a current transformer, the controller comprising:
a processor;
a memory storing a computer program which, when executed by a processor, causes the processor to perform a method of controlling a flywheel energy storage unit as claimed in any one of claims 1 to 8.
12. A wind power plant, characterized in that it comprises a controller of a converter according to claim 11.
CN202111651378.4A 2021-12-30 2021-12-30 Flywheel energy storage unit control method and device and wind generating set Pending CN116418123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111651378.4A CN116418123A (en) 2021-12-30 2021-12-30 Flywheel energy storage unit control method and device and wind generating set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111651378.4A CN116418123A (en) 2021-12-30 2021-12-30 Flywheel energy storage unit control method and device and wind generating set

Publications (1)

Publication Number Publication Date
CN116418123A true CN116418123A (en) 2023-07-11

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