CN103441539A - Auxiliary hubrid battery of wind power pitch control system and charging and discharging method - Google Patents

Auxiliary hubrid battery of wind power pitch control system and charging and discharging method Download PDF

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CN103441539A
CN103441539A CN2013103407072A CN201310340707A CN103441539A CN 103441539 A CN103441539 A CN 103441539A CN 2013103407072 A CN2013103407072 A CN 2013103407072A CN 201310340707 A CN201310340707 A CN 201310340707A CN 103441539 A CN103441539 A CN 103441539A
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battery
wind power
hybrid battery
converter
lithium
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CN103441539B (en
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李泰�
曾庆军
侯小燕
李春华
王玉龙
王伟然
赵黎
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Jiangsu University of Science and Technology
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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
    • Y02E60/10—Energy storage using batteries
    • 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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Abstract

The invention relates to an auxiliary hybrid battery of a wind power pitch control system and a charging and discharging method. The battery comprises a hybrid battery body, a hybrid power supply charging system for charging the hybrid battery body and at least one diode. The hybrid battery body is formed by parallel connection of a branch circuit formed by serial connection of a lithium power battery pack and a DC/DC converter A and a branch circuit formed by serial connection of a super capacitor bank and a DC/DC converter B. The diode and the hybrid battery body are connected to a bus of a direct-current power supply for supplying power for the wind power pitch control system in a serial mode. According to the method, DC/DC conversion controllers control DC/DC converters to adjust voltage and current input and output of the lithium power battery pack and the supper capacitor bank, so that the aim that the lithium power battery pack and the super capacitor bank charge and discharge the battery coordinately is achieved. According to the auxiliary hybrid battery of the wind power pitch control system and the charging and discharging method, advantages of super capacitors and advantages of lithium batteries are mutually complemented, the hybrid battery energy density is improved, output power is increased, cycle life is prolonged, economic cost is reduced, and safety and reliability are improved.

Description

The auxiliary hybrid battery of a kind of wind power pitch-controlled system and charging/discharging thereof
Technical field
The present invention relates to the auxiliary hybrid battery of a kind of wind power pitch-controlled system and charging/discharging thereof, belong to wind power equipment control technology field.
Background technology
Day by day serious along with energy crisis and problem of environmental pollution, wind energy is subject to countries in the world as a kind of clean reproducible energy and pays much attention to.Wind generating technology is progressively ripe and perfect, aspect a lot of, popularized and applies.Smoothly grid-connected in order to ensure wind-driven generator output electric energy, the variable pitch technology is applied on wind power generation, and the vane change device significance level increases day by day.
In wind power pitch-controlled system, pitch-controlled system can work when pitch-controlled system energy emergency feathering and voltage fluctuation when guaranteeing grid cut-off, and pitch-controlled system must have self accessory power supply.The tradition wind power pitch-controlled system adopts lead acid accumulator as stand-by power supply more, and super capacitor and lithium dynamical battery are applied in the wind power pitch-controlled system energy storage device in recent years.Obviously there are a lot of defects in traditional lead acid accumulator: useful life is short, the charging interval is long and can be to environment etc.Super capacitor, as a kind of novel energy-storing element, the advantages such as power density is high, the time that discharges and recharges is short, have extended cycle life, operating temperature range is wide are arranged, but its cost is higher; Lithium battery, as a kind of novel battery, has the advantages such as lightweight, life-span length, environmental protection; and the super capacitor cost is lower relatively, but its fail safe is poor, easily blasts; and super-charge super-discharge easily appears in charge and discharge process, need safety protective circuit.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of energy density improves, power stage is large, the use longevity is long, Financial cost is low and security reliability the is high auxiliary hybrid battery of wind power pitch-controlled system and charging/discharging thereof are provided.
For achieving the above object, the present invention adopts following technical scheme:
A kind of wind power pitch-controlled system is assisted hybrid battery, comprise the hybrid battery body, be the AC-battery power source charging system of described this bulk charging of hybrid battery and at least one diode, the branch circuit parallel connection that described hybrid battery body is connected with super capacitor group and DC/DC converter B by the branch road of lithium power battery pack and DC/DC converter A series connection forms, and described diode and hybrid battery body are connected in series on the DC power supply bus into the wind power pitch-controlled system power supply.
Described lithium power battery pack is composed in parallel by 2 lithium dynamical battery serial module structures, each lithium dynamical battery serial module structure is in series by 20 battery blocks, each battery block is 11V, and the LiMn2O4 electrokinetic cell that each battery block is 3.7V/7.5Ah by 3 characteristics is composed in series.
Described lithium power battery pack characteristic is 220V/15Ah.
The super-capacitor module that described super capacitor group is 16V/58F by 15 characteristics is composed in series.
Described AC-battery power source charging system comprises rectification circuit and DC/DC conversion control module, DC/DC conversion control module comprises DC/DC conversion control module A and DC/DC conversion control module B, described rectification circuit is in parallel with the hybrid battery body, DC/DC conversion control module A provide control signal for DC/DC converter A, and DC/DC conversion control module B provide control signal for DC/DC converter B.
Described rectification circuit adopts bridge rectifier or adopts the rectifier system of thyristor control.
Described DC/DC conversion control module is two DC/DC Double closed-loop of voltage and current systems.
In described DC/DC Double closed-loop of voltage and current system, the difference of rectifier output voltage reference value and its measured value is regulated through PI, obtain energy-storage system output current reference value, the difference of energy-storage system output current reference value and its output current measured value is regulated through PI, through on-off controller, the output control signal is as the switch conduction signal of DC/DC converter again.
Described DC/DC converter A and B are two Boost ?Buck translation circuits, by Boost converter and Buck converter, formed; When hybrid battery is charged, Boost ?Buck translation circuit input and output voltage closes and is:
Figure BDA00003624724700011
Figure BDA00003624724700012
when hybrid battery discharges, Boost ?Buck translation circuit input and output voltage closes and is: V o V in = 1 - d d ( 0 < d < 1 ) , Wherein d = t on T , Be the switch conduction duty ratio.
The charging/discharging thereof of the auxiliary hybrid battery of wind power pitch-controlled system is as follows:
It is that the wind power pitch-controlled system rated voltage is as the voltage reference value in the charge or discharge process that described AC-battery power source charging system is chosen the rectification circuit output valve, take lithium power battery pack or super capacitor group output voltage electric current is the FEEDBACK CONTROL amount, controls the switch conduction signal that obtains the DC/DC converter by two closed loop feedback;
Described DC/DC converter A and B input or output the electric current and voltage size according to the given switch conduction Signal-controlled switch of AC-battery power source charging system pipe break-make to regulate lithium power battery pack or super capacitor group, make it meet the charging of AC-battery power source charging system or wind power pitch-controlled system power reguirements, reach lithium battery group and super capacitor group and coordinate to control.
The present invention discharges and recharges and coordinates to control the hybrid battery be comprised of lithium power battery pack and super capacitor group by DC/DC transform controller and DC/DC converter, super capacitor and lithium battery are formed and have complementary advantages, the hybrid battery energy density improves, power stage increases, cycle life extends, Financial cost reduces and security reliability improves.
The accompanying drawing explanation
Fig. 1 is the wind power pitch-controlled system stand-by power supply device circuit figure of the specific embodiment of the present invention.
Fig. 2 is lithium power battery pack circuit diagram of the present invention.
Fig. 3 is super capacitor group circuit diagram of the present invention.
Fig. 4 is AC-battery power source charging system structure chart of the present invention.
Fig. 5 is the Double closed-loop of voltage and current figure of DC/DC conversion control module of the present invention.
Fig. 6 be DC/DC converter of the present invention Boost ?Buck translation circuit figure.
Embodiment
Below in conjunction with concrete drawings and Examples, the invention will be further described.
A kind of wind power pitch-controlled system is assisted hybrid battery, as shown in Figure 1, auxiliary hybrid battery in described wind power pitch-controlled system comprises at least one diode, the hybrid battery that lithium power battery pack and super capacitor group combine, AC-battery power source charging system for described hybrid battery charging, described diode and hybrid battery are connected in series in the DC power supply bus into the wind power pitch-controlled system power supply, and the branch circuit parallel connection that described hybrid battery is connected with super capacitor group and DC/DC converter B by the branch road of lithium power battery pack and DC/DC converter A series connection forms.
As shown in Figure 2, described lithium power battery pack is composed in parallel by 2 lithium dynamical battery serial module structures, each lithium dynamical battery serial module structure is in series by 20 battery blocks, and each battery block is 11V, and the LiMn2O4 electrokinetic cell that each battery block is 3.7V/7.5Ah by 3 characteristics is composed in series.The lithium power battery pack characteristic is 220V/15Ah.
As shown in Figure 3, the super-capacitor module that described super capacitor group is 16V/58F by 15 characteristics is composed in series.
As shown in Figure 4, described AC-battery power source charging system comprises rectification circuit and DC/DC conversion control module.Described rectification circuit and hybrid battery also connect.Described rectification circuit adopts bridge rectifier, also can adopt the rectifier system of thyristor control; Described DC/DC conversion control module comprises DC/DC conversion control module A and DC/DC conversion control module B, and they provide respectively the control signal of DC/DC converter A and DC/DC converter B.The control system that above-mentioned DC/DC conversion control module A and DC/DC conversion control module B are comprised of voltage and current double closed-loop.Above-mentioned DC/DC converter A and DC/DC converter B be two Boost ?the Buck translation circuit.
As shown in Figure 5, in above-mentioned DC/DC Double closed-loop of voltage and current system, the difference of voltage reference value and its measured value is regulated through PI, obtain energy-storage system output current reference value, the difference of energy-storage system output current reference value and its output current measured value is regulated through PI, through on-off controller, the output control signal is as the switch conduction signal of DC/DC converter again.
As shown in Figure 6, in above-mentioned Boost ?Buck translation circuit, when hybrid battery is charged, Boost ?Buck translation circuit input and output voltage closes and is: when hybrid battery discharges, Boost ?Buck translation circuit input and output voltage closes and is:
Figure BDA00003624724700031
wherein
Figure BDA00003624724700032
be the switch conduction duty ratio.Described switch conduction duty ratio is provided by DC/DC Double closed-loop of voltage and current system.
Technical scheme of the present invention also discloses the auxiliary hybrid battery charging/discharging thereof of a kind of wind power pitch-controlled system simultaneously, comprises the following steps:
Described DC/DC Double closed-loop of voltage and current system is chosen rectification circuit output valve (wind power pitch-controlled system rated voltage) as the voltage reference value in charging (electric discharge) process, take lithium power battery pack or super capacitor group output voltage electric current is the FEEDBACK CONTROL amount, controls the switch conduction signal that obtains the DC/DC converter by two closed loop feedback.
Described Boost ?the Buck translation circuit according to the given switch conduction Signal-controlled switch of DC/DC Double closed-loop of voltage and current system pipe break-make to regulate lithium power battery pack or super capacitor group input (output) electric current and voltage size, make it meet AC-battery power source charging system charging (wind power pitch-controlled system power supply) requirement, reach lithium battery group and super capacitor group and coordinate the purpose of controlling.
Directly be the pitch-controlled system power supply by DC bus when line voltage is normal, when the line voltage instantaneous power-down or while big ups and downs occurring, hybrid battery starts power supply.The hybrid battery electric discharge is comprised of the electric discharge of super capacitor group and the common electric discharge of lithium power battery pack.Take the wind power pitch-controlled system rated voltage as voltage reference value, DC/DC conversion control module A and DC/DC conversion control module B process to the voltage and current measurement value of measured lithium power battery pack and super capacitance cell group the control signal that obtains DC/DC converter A and DC/DC converter B respectively, control respectively lithium power battery pack and super capacitor group output voltage electric current by DC/DC converter A and DC/DC converter B, make its power reguirements that meets pitch-controlled system, after electrical network is normal, be switched to original DC power supply bus.
When lithium battery or electric capacity electric weight deficiency, start by the AC-battery power source charging system, hybrid battery to be charged.It is similar to discharge process that hybrid battery fills process, is also to be produced the control signal of DC/DC converter by DC/DC conversion control module, controls the charging voltage and current of each battery pack by the DC/DC converter.Different is that voltage reference value is AC-battery power source charging system rectification circuit output valve.

Claims (10)

1. a wind power pitch-controlled system is assisted hybrid battery, it is characterized in that comprising the hybrid battery body, be the AC-battery power source charging system of described this bulk charging of hybrid battery and at least one diode, the branch circuit parallel connection that described hybrid battery body is connected with super capacitor group and DC/DC converter B by the branch road of lithium power battery pack and DC/DC converter A series connection forms, and described diode and hybrid battery body are connected in series on the DC power supply bus into the wind power pitch-controlled system power supply.
2. according to the auxiliary hybrid battery of the wind power pitch-controlled system described in claim 1, it is characterized in that, described lithium power battery pack is composed in parallel by 2 lithium dynamical battery serial module structures, each lithium dynamical battery serial module structure is in series by 20 battery blocks, each battery block is 11V, and the LiMn2O4 electrokinetic cell that each battery block is 3.7V/7.5Ah by 3 characteristics is composed in series.
3. according to the auxiliary hybrid battery of the wind power pitch-controlled system described in claim 2, it is characterized in that, described lithium power battery pack characteristic is 220V/15Ah.
4. according to the auxiliary hybrid battery of the wind power pitch-controlled system described in claim 1, it is characterized in that the super-capacitor module that described super capacitor group is 16V/58F by 15 characteristics is composed in series.
5. according to the auxiliary hybrid battery of the wind power pitch-controlled system described in claim 1, it is characterized in that, described AC-battery power source charging system comprises rectification circuit and DC/DC conversion control module, DC/DC conversion control module comprises DC/DC conversion control module A and DC/DC conversion control module B, described rectification circuit is in parallel with the hybrid battery body, DC/DC conversion control module A provide control signal for DC/DC converter A, and DC/DC conversion control module B provide control signal for DC/DC converter B.
6. according to the auxiliary hybrid battery of the wind power pitch-controlled system described in claim 5, it is characterized in that, described rectification circuit adopts bridge rectifier or adopts the rectifier system of thyristor control.
7. according to the auxiliary hybrid battery of the wind power pitch-controlled system described in claim 5, it is characterized in that, described DC/DC conversion control module is two DC/DC Double closed-loop of voltage and current systems.
8. according to the auxiliary hybrid battery of the wind power pitch-controlled system described in claim 7, it is characterized in that, in described DC/DC Double closed-loop of voltage and current system, the difference of rectifier output voltage reference value and its measured value is regulated through PI, obtain energy-storage system output current reference value, the difference of energy-storage system output current reference value and its output current measured value is regulated through PI, then, through on-off controller, the output control signal is as the switch conduction signal of DC/DC converter.
9. according to the auxiliary hybrid battery of the wind power pitch-controlled system described in claim 5, it is characterized in that, described DC/DC converter A and B are two Boost-Buck translation circuits, by Boost converter and Buck converter, formed; When hybrid battery is charged, Boost-Buck translation circuit input and output voltage closes and is:
Figure FDA00003624724600011
when hybrid battery discharges, Boost-Buck translation circuit input and output voltage closes and is:
Figure FDA00003624724600012
wherein
Figure FDA00003624724600013
be the switch conduction duty ratio.
10. the charging/discharging thereof based on the auxiliary hybrid battery of wind power pitch-controlled system claimed in claim 1 is characterized in that described method is as follows:
It is that the wind power pitch-controlled system rated voltage is as the voltage reference value in the charge or discharge process that described AC-battery power source charging system is chosen the rectification circuit output valve, take lithium power battery pack or super capacitor group output voltage electric current is the FEEDBACK CONTROL amount, controls the switch conduction signal that obtains the DC/DC converter by two closed loop feedback;
Described DC/DC converter A and B input or output the electric current and voltage size according to the given switch conduction Signal-controlled switch of AC-battery power source charging system pipe break-make to regulate lithium power battery pack or super capacitor group, make it meet the charging of AC-battery power source charging system or wind power pitch-controlled system power reguirements, reach lithium battery group and super capacitor group and coordinate to control.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103921641A (en) * 2014-04-29 2014-07-16 江苏大学 Energy feedback suspension system and control method
US10069303B2 (en) 2015-04-14 2018-09-04 General Electric Company Power generation system and method with energy management

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1785707A (en) * 2005-12-09 2006-06-14 清华大学 Fuel battery automobile mixed power system using super capacity as auxiliary power device
CN102013726A (en) * 2010-12-10 2011-04-13 苏州能健电气有限公司 Backup power supply device in wind turbine pitch system
CN102403737A (en) * 2011-12-27 2012-04-04 保定天威集团有限公司 Method and system for controlling wind-solar hybrid power generation and energy storage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1785707A (en) * 2005-12-09 2006-06-14 清华大学 Fuel battery automobile mixed power system using super capacity as auxiliary power device
CN102013726A (en) * 2010-12-10 2011-04-13 苏州能健电气有限公司 Backup power supply device in wind turbine pitch system
CN102403737A (en) * 2011-12-27 2012-04-04 保定天威集团有限公司 Method and system for controlling wind-solar hybrid power generation and energy storage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103921641A (en) * 2014-04-29 2014-07-16 江苏大学 Energy feedback suspension system and control method
CN103921641B (en) * 2014-04-29 2016-03-02 江苏大学 A kind of energy regenerative suspension system and control method
US10069303B2 (en) 2015-04-14 2018-09-04 General Electric Company Power generation system and method with energy management

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