CN113364014A - Wind power generation power energy storage stabilizing system, control method and control system - Google Patents

Wind power generation power energy storage stabilizing system, control method and control system Download PDF

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Publication number
CN113364014A
CN113364014A CN202110519009.3A CN202110519009A CN113364014A CN 113364014 A CN113364014 A CN 113364014A CN 202110519009 A CN202110519009 A CN 202110519009A CN 113364014 A CN113364014 A CN 113364014A
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energy storage
grid
storage device
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power
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黎林园
邹建龙
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Xian Jiaotong University
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Xian Jiaotong University
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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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
    • F03D9/10—Combinations of wind motors with apparatus storing energy
    • F03D9/11—Combinations of wind motors with apparatus storing energy storing electrical energy
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a wind power generation power energy storage stabilizing system, a control method and a control system.

Description

Wind power generation power energy storage stabilizing system, control method and control system
Technical Field
The invention belongs to the technical field of new energy grid connection, and particularly relates to a wind power generation power energy storage stabilizing system, a control method and a control system.
Background
The energy crisis is becoming more serious, the environmental pollution is becoming more serious, and how to better develop renewable energy and clean energy becomes a hot problem. The wind energy is inexhaustible, has no pollution to the environment, becomes a clean energy source which is vigorously developed by the nation, and the installed capacity of the wind power is gradually increased.
The large permanent magnet direct-drive wind power generation system mostly adopts back-to-back double PWM full-power converters, the structure can realize bidirectional flow of power, each converter can also adopt an independent vector control system, and finally wind energy is converted into electric energy meeting grid-connected requirements. However, because the wind speed has randomness and volatility, the power output by the wind power system has uncertainty, and stable and reliable operation of a power grid can be influenced during grid connection, so that the stability and economy of the operation of the power grid are influenced.
Disclosure of Invention
The invention aims to provide a wind power generation power energy storage stabilizing system, a control method and a control system, which aim to solve the problem of power fluctuation of a wind power generation system when wind speed fluctuates.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wind power generation power energy storage stabilizing system comprises a machine side subsystem, a network side subsystem and an energy storage subsystem;
the machine side subsystem comprises a fan, a permanent magnet synchronous motor and a machine side converter which are sequentially connected, and the network side subsystem comprises a network side converter and an alternating current power grid which are sequentially connected; the direct current side of the machine side converter and the direct current side of the grid side converter are connected through a direct current bus;
the energy storage subsystem comprises an energy storage device, and the energy storage device is connected with the direct current bus;
when the power generated by the permanent magnet synchronous motor is higher than the power required by the network side subsystem, the energy storage device is charged; and when the power output of the permanent magnet synchronous motor is lower than the power required by the network side subsystem, the energy storage device discharges.
Preferably, the energy storage device is a lithium battery.
Preferably, a bidirectional DC/DC converter is connected between the energy storage device and the DC bus.
Preferably, an inductor L is further connected between the energy storage device and the dc busb。
Preferably, a grid-side inductor L and a grid-side resistor R are connected between the grid-side converter and the ac power grid.
The invention provides another technical scheme that:
a control method is used for the wind power generation power energy storage stabilizing system and comprises the following steps:
side netReference value p of system powergrefAnd the actual value pgThe difference is used as input, and a reference value i of the current of the energy storage device is obtained through a PI controllerbref；
Reference value i of energy storage device currentbrefAnd the actual value ibMaking a difference, and obtaining the duty ratio of the PWM wave through a PI controller; two switching signals G are obtained through modulation1And G2；
Output G1And G2And controlling the upper and lower tubes in the bidirectional DC/DC converter of the energy storage subsystem to be switched on or switched off to realize the charging and discharging of the energy storage device.
Preferably, p isgThe calculation method of (c) is as follows:
orienting the d-axis of a two-phase rotating coordinate system in the direction of the grid voltage vector, ugq＝0，
Figure BDA0003063159390000021
In the formula: u. ofgd、ugqIs the d, q-axis component, i, of the output voltage of the grid-side convertergd、igqAre the d and q axis components of the grid side converter output current.
Preferably, ugd、ugqThe calculation method of (c) is as follows:
Figure BDA0003063159390000031
in the formula: u. ofga、ugb、ugcThe component of the grid voltage is an a-axis component, a b-axis component and a c-axis component.
Preferably, igd、igqThe calculation method of (c) is as follows:
Figure BDA0003063159390000032
in the formula: i.e. iga、igb、igcThe component of the a axis, the component of the b axis and the component of the c axis of the grid current.
The invention provides another technical scheme that:
a control system for said control method, comprising:
a first module for referring to the reference value p of the network side subsystem powergrefAnd the actual value pgThe difference is used as input, and a reference value i of the current of the energy storage device is obtained through a PI controllerbref；
A second module for referencing the current i of the energy storage devicebrefAnd the actual value ibMaking a difference, and obtaining the duty ratio of the PWM wave through a PI controller; two switching signals G are obtained through modulation1And G2；
A third module for outputting G1And G2And controlling the upper and lower tubes in the bidirectional DC/DC converter of the energy storage subsystem to be switched on or switched off.
The invention has the following beneficial effects:
according to the wind power generation power energy storage stabilizing system, the control method and the control system provided by the embodiment of the invention, the energy storage subsystem is introduced to the direct current bus side of the wind power generation system to stabilize the power of the wind power generation system, when the wind speed fluctuates, the energy storage subsystem can stabilize the power fluctuation of the wind power generation system, the grid connection stability of the wind power generation system is improved, and the energy recycling is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a structural diagram of a wind power energy storage stabilizing system according to an embodiment of the present invention;
fig. 2 is a diagram of an energy storage side control strategy structure of the control method according to the embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The embodiment of the invention provides a wind power generation power energy storage stabilizing system, a control method and a control system, and aims to stabilize power fluctuation of a wind power system and improve the stability of the whole system by connecting an energy storage device at a direct current bus. When the power generated by the permanent magnet synchronous motor is higher than the power required by the network side subsystem, the energy storage device is charged; and when the power output of the permanent magnet synchronous motor is lower than the power required by the network side subsystem, the energy storage device discharges.
As shown in fig. 1, a wind power generation power energy storage stabilizing system includes a machine side subsystem, a grid side subsystem and an energy storage subsystem; the machine side subsystem comprises a fan, a permanent magnet synchronous motor and a machine side converter (AC/DC converter) which are sequentially connected. The grid-side subsystem comprises a grid-side converter (DC/A C converter) and an alternating current grid which are sequentially connected, and a grid-side inductor L and a grid-side resistor R are connected between the grid-side converter and the alternating current grid. The direct current side of the machine side converter and the direct current side of the grid side converter are connected through a direct current bus. The energy storage subsystem comprises an energy storage device, the energy storage device is connected with the direct current bus, and a bidirectional DC/DC converter and an inductor L are connected between the energy storage device and the direct current busb。
The fan is a prime mover of the whole wind power generation system and is used for capturing wind energy, and the running state of the fan can directly influence the performance and the working efficiency of the whole wind turbine generator. The permanent magnet synchronous motor is an important part for realizing energy conversion, and converts wind energy into electric energy. The grid-side converter and the machine-side converter respectively adopt independent vector control systems, and the machine-side converter mainly aims at capturing more wind energy as much as possible and adopts maximum power tracking control. The grid-side converter controls the voltage of the direct-current bus by controlling the current of the alternating-current and direct-current shafts, and the voltage of the direct-current bus is kept stable.
The wind blows blades of a fan to convert wind energy into mechanical energy, the fan rotates to drive a permanent magnet synchronous motor rotor to rotate through a transmission chain, and electric energy is generated under the action of a rotating magnetic field generated by a permanent magnet. The electric energy is converted into direct current through the machine side converter, and the direct current is converted into alternating current with controllable power and amplitude through inversion to realize grid connection; when the wind speed changes, the power generation amount also changes; when the power generated by the permanent magnet synchronous motor is higher than the power required by the network side subsystem, the energy storage device is charged; when the power generated by the permanent magnet synchronous motor is lower than the power required by the network side subsystem, the energy storage device discharges; the power change is stabilized by sending or absorbing power, so that the grid connection stability of the whole system is improved.
In the preferred embodiment of the invention, the energy storage device adopts a lithium battery for energy storage, and the bidirectional flow of energy is realized through the bidirectional DC/DC controller, so that the power change of the wind power generation system is stabilized when the power changes.
As shown in FIG. 1, usa、usb、uscIs the three-phase stator voltage of a permanent magnet synchronous machine isa、isb、iscIs the three-phase stator current of a permanent magnet synchronous motor udcIs the DC bus voltage uga、ugb、ugcIs the three-phase voltage of the grid, iga、igb、igcIs the three-phase current of the power grid, R, L is the grid side resistance and inductance, and in this embodiment, the R value is 0. i.e. ibIs the current of a lithium battery.
A control method is used for a wind power generation power energy storage stabilizing system and comprises the following steps:
s1, converting the reference value p of the network side subsystem powergrefAnd the actual value pgThe difference is used as input, and a reference value i of the current of the energy storage device is obtained through a PI controllerbref；
pgThe calculation method of (c) is as follows:
Figure BDA0003063159390000051
orienting the d-axis of a two-phase rotating coordinate system in the direction of the grid voltage vector，ugq＝0，
Figure BDA0003063159390000052
In the formula: u. ofgd、ugqIs the d, q-axis component, i, of the output voltage of the grid-side convertergd、igqAre the d and q axis components of the grid side converter output current.
ugd、ugqThe calculation method of (c) is as follows:
Figure BDA0003063159390000061
in the formula: u. ofga、ugb、ugcThe component of the grid voltage is an a-axis component, a b-axis component and a c-axis component.
igd、igqThe calculation method of (c) is as follows:
Figure BDA0003063159390000062
in the formula: i.e. iga、igb、igcThe component of the a axis, the component of the b axis and the component of the c axis of the grid current.
S2, referring the current of the energy storage device to the value ibrefAnd the actual value ibMaking difference, obtaining the duty ratio of PWM wave by PI controller, and obtaining G by modulation1And G2。
S3, output G1And G2And controlling the connection or disconnection of an upper IGBT tube and a lower IGBT tube in a bidirectional DC/DC converter of the energy storage subsystem to realize the charge and discharge of the energy storage device.
A control system for the control method described above, comprising:
a first module for referring to the reference value p of the network side subsystem powergrefAnd the actual value pgThe difference is used as input, and a reference value i of the current of the energy storage device is obtained through a PI controllerbref；
A second module for referencing the current i of the energy storage devicebrefAnd the actual value ibMaking difference, obtaining the duty ratio of PWM wave by PI controller, and obtaining G by modulation1And G2；
A third module for outputting G1And G2And controlling the upper and lower tubes in the bidirectional DC/DC converter of the energy storage subsystem to be switched on or switched off.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.

Claims (10)

1. A wind power generation power energy storage stabilizing system is characterized by comprising a machine side subsystem, a network side subsystem and an energy storage subsystem;
the machine side subsystem comprises a fan, a permanent magnet synchronous motor and a machine side converter which are sequentially connected, and the network side subsystem comprises a network side converter and an alternating current power grid which are sequentially connected; the direct current side of the machine side converter and the direct current side of the grid side converter are connected through a direct current bus;
the energy storage subsystem comprises an energy storage device, and the energy storage device is connected with the direct current bus;
when the power generated by the permanent magnet synchronous motor is higher than the power required by the network side subsystem, the energy storage device is charged; and when the power output of the permanent magnet synchronous motor is lower than the power required by the network side subsystem, the energy storage device discharges.
2. The wind power energy storage leveling system of claim 1, wherein the energy storage device is a lithium battery.
3. The wind power energy storage flattening system of claim 1, characterized in that a bidirectional DC/DC converter is connected between the energy storage device and the DC bus.
4. The wind power energy storage leveling system of claim 3, wherein an inductor L is further connected between the energy storage device and the DC busb。
5. The wind power energy storage leveling system of claim 1, wherein a grid side inductor L and a grid side resistor R are connected between the grid side converter and the ac grid.
6. A control method for a wind power energy storage flattening system according to claim 1, characterized by comprising the steps of:
reference value p of network side subsystem powergrefAnd the actual value pgThe difference is used as input, and a reference value i of the current of the energy storage device is obtained through a PI controllerbref；
Reference value i of energy storage device currentbrefAnd the actual value ibMaking a difference, and obtaining the duty ratio of the PWM wave through a PI controller; two switching signals G are obtained through modulation1And G2；
Output G1And G2And controlling the upper and lower tubes in the bidirectional DC/DC converter of the energy storage subsystem to be switched on or switched off to realize the charging and discharging of the energy storage device.
7. Control method according to claim 6, characterized in that pgThe calculation method of (c) is as follows:
orienting the d-axis of a two-phase rotating coordinate system in the direction of the grid voltage vector, ugq＝0，
Figure FDA0003063159380000021
In the formula: u. ofgd、ugqIs the d, q-axis component, i, of the output voltage of the grid-side convertergd、igqAre the d and q axis components of the grid side converter output current.
8. Control according to claim 7The preparation method is characterized in that ugd、ugqThe calculation method of (c) is as follows:
Figure FDA0003063159380000022
in the formula: u. ofga、ugb、ugcThe component of the grid voltage is an a-axis component, a b-axis component and a c-axis component.
9. Control method according to claim 7, characterized in that igd、igqThe calculation method of (c) is as follows:
Figure FDA0003063159380000023
in the formula: i.e. iga、igb、igcThe component of the a axis, the component of the b axis and the component of the c axis of the grid current.
10. A control system for use in the control method of claim 6, comprising:
a first module for referring to the reference value p of the network side subsystem powergrefAnd the actual value pgThe difference is used as input, and a reference value i of the current of the energy storage device is obtained through a PI controllerbref；
A second module for referencing the current i of the energy storage devicebrefAnd the actual value ibMaking a difference, and obtaining the duty ratio of the PWM wave through a PI controller; two switching signals G are obtained through modulation1And G2；
A third module for outputting G1And G2And controlling the upper and lower tubes in the bidirectional DC/DC converter of the energy storage subsystem to be switched on or switched off.
CN202110519009.3A 2021-05-12 2021-05-12 Wind power generation power energy storage stabilizing system, control method and control system Pending CN113364014A (en)

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