CN105743112B - A kind of control method of the exchange flexible power system based on battery energy storage - Google Patents
A kind of control method of the exchange flexible power system based on battery energy storage Download PDFInfo
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- CN105743112B CN105743112B CN201610270657.9A CN201610270657A CN105743112B CN 105743112 B CN105743112 B CN 105743112B CN 201610270657 A CN201610270657 A CN 201610270657A CN 105743112 B CN105743112 B CN 105743112B
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a kind of control method of the exchange flexible power system based on battery energy storage, the control mode of wherein charging and discharging circuit controller is to monitor cell voltage U in real timeEWith AC/DC converter loop DC bus-bar voltage UDDynamic electric voltage, control the regulation of discharge and recharge so that UDKeep stable；The control mode of wherein AC/DC converter loop control unit is to export active and/or idle drive signal to give AC/DC converter loop so that the output current I in AC/DC converter loop0Any value changes in the circle for the four-quadrant that the current transformer maximum output ability in AC/DC converter loop is limited so that active and/or idle regulation output can be realized.The control method for the power system realized according to the present invention, effective control mode is proposed to the power system based on battery energy storage, enable the power system based on battery energy storage to meet more various output demand, be especially adapted for use in the load condition of idle output.
Description
Technical field
The invention belongs to electrical thermal storage and electric energy conversion art, more particularly, to a kind of exchange based on battery energy storage
The control method of flexible power system.
Background technology
With the saving and utilization to energy resource system, regenerative resource turns into the emphasis of present power system application, can be again
The raw energy includes solar energy, waterpower, the various biological energy sources of wind-force etc., these usings energy source are got up to store carries out regeneration and makes
With, but because electric power system of today is into networking, systematization, power train can be caused to a large amount of use of regenerative resource
System Generation Side becomes to become increasingly complex, and along with the difference of all kinds of electricity needs such as civilian and commercial, causes the electric power demand side to be in
Existing state in multifarious changes, will keep the harmony of power supply and demand, the feed end of electric power and demand end must all keep certain sum
Humorous, among these, a kind of relatively effective mode is to use electrical thermal storage technology, especially battery energy storage technology.
But in the application of existing battery energy storage technology, rectification and inversion universal functionality are single, and only active energy can
Inverse transmission, and in order that wanting for protean electric power demand side can be met as power supply grid by obtaining battery energy storage technology
Ask, it is also necessary to consider reactive requirement, when the terminal access for there are some load or burden without work, battery energy storage technology is except needing to carry
Outside active power, it is also necessary to provide reactive power, the settling mode used in the prior art is that have part new energy access
System configures a large amount of dynamic reactive compensation devices to solve idle problem in addition, and aforesaid way was not only complicated but also unreliable, control
Relevance is bad, can not reach active reactive Collaborative Control, and effect is bad.The present invention is using active reactive regulation integrated technique
Scheme, simulate synchronous generator/motor output characteristics, there is provided a significantly more efficient solution.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of exchange based on battery energy storage is soft
Property power system and its control method, its object is to provide it is a kind of it is working online for a long time, can bidirectional energy transmission, it is two-way
Reactive-power control, static dynamic electric energy power system and its control method, fully to meet the needs of electric power demand side.
To achieve the above object, according to one aspect of the present invention, there is provided a kind of exchange based on battery energy storage is flexible
The control method of power system, the control method based on the exchange flexible power system include battery in parallel successively,
Battery charging and discharging loop, AC/DC converter loop, reactor, in addition to it is arranged at the battery charging and discharging loop and the friendship
Capacitor bank between DC transformer loop, it is characterised in that the exchange flexible power system also includes charging and discharging circuit
Controller and AC/DC converter loop control unit, wherein the charging and discharging circuit controller is used for charging and discharging circuit reality
Now control, the AC/DC converter loop control unit, which is used to realize the AC/DC converter loop, to be controlled；
The control mode of wherein described charging and discharging circuit controller is to monitor the cell voltage U in real timeEHanded over directly with described
Flow converter loop DC bus-bar voltage UDDynamic electric voltage, control the regulation of the charging and discharging in the battery discharge loop,
So that the DC bus-bar voltage UDKeep stable；
The control mode of wherein described AC/DC converter loop control unit is to export active and/or idle drive signal
Give the AC/DC converter loop so that the output current I in the AC/DC converter loop0With the alternating current-direct current unsteady flow
Any value changes in the circle for the four-quadrant that current transformer maximum output ability in device loop is limited so that can realize active
And/or idle regulation output.
Further, in the control mode of the AC/DC converter loop control unit, the AC/DC converter loop
In current transformer output current value be：I0=S0/US, S0For the output capacity of the whole exchange flexible power system, the value
Determined by the setting of AC/DC converter loop control unit receiving, USFor voltage on line side；The AC/DC converter loop
In current transformer output magnitude of voltage be：U0=US+Ul=US+I0*Xl, wherein XlFor connection current transformer and the reactance value of power network.
Further, under the control of the AC/DC converter loop control unit, the output I0Variation pattern such as
Under：
I0Circumferentially change：The corresponding maximum apparent energy of current transformer output in the AC/DC converter loop is defeated
Go out, difference in functionality is corresponded in different quadrants, be respectively perceptual charging, capacitive charging, capacitive discharge, sense from first to fourth quadrant
Property electric discharge；
I0Change along the longitudinal axis：Pure active discharge and recharge, adjusted between peak power charging and peak power electric discharge, power
Factor is 1；
I0Change along transverse axis：Pure idle output, the battery without discharge and recharge, it is idle maximum capacitive and maximum inductive it
Between adjust；
I0Change along longitudinal chord：Output characteristics is adjusted for the discharge and recharge of permanent idle output；
I0Change along horizontal string：Output characteristics is the Reactive-power control of permanent active discharge and recharge.
I0Change along radius of circle：Output characteristics is adjusted for the discharge and recharge of constant power factor.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
(1) present invention proposes the problem of it can not produce idle output for the power system based on battery energy storage；
(2) present invention proposes effective control mode for above-mentioned power system so that the power train based on battery energy storage
System can meet the demand of more various output end, be especially adapted for use in the situation of idle output.
Brief description of the drawings
Fig. 1 is the battery energy storage example structure figure for working in single phase ac loop realized according to the present invention；
Fig. 2 is the battery energy storage example structure figure for working in three-phase alternating current loop realized according to the present invention；
Fig. 3 is that the control of the control method for the exchange flexible power system based on battery energy storage realized according to the present invention is sweared
Measure analysis chart.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Conflict can is not formed each other to be mutually combined.
Fig. 1 show the battery energy storage embodiment schematic diagram for working in single phase ac loop, the major loop part of system by
Great-capacity power battery E in parallel, battery charging and discharging loop, single-phase AC/DC converter loop, single-phase reactor composition successively；
Major loop hardware also includes the electric capacity being arranged between battery charging and discharging loop and single-phase AC/DC converter loop
Device (group), battery charging and discharging loop control unit and alternating current-direct current unsteady flow loop control unit.
Wherein battery charging and discharging loop is using in the prior art frequently with the charging and discharging circuit generally used, and battery charge and discharge
Electrical circuit controller is used to realize the control to charging and discharging circuit；Charging and discharging circuit controller is subjected to great-capacity power battery electricity
Press UEWith current transformer DC bus-bar voltage detection signal UD, realize the rapid translating of charging and discharging and continuously adjust, to ensure to become
Flow the stabilization of device DC bus-bar voltage.
Current transformer receives the active and idle control instruction from its controller, and the concrete form of instruction is the electricity of input
Piezoelectricity stream information, with reference to the voltage on line side U of feedbackS, inverter output voltage U0With inverter output current I0, produce frequency and power network
Frequency is consistent, the sine wave signal of amplitude and phase depending on control instruction, so as to control alternating current corresponding to current transformer output
Pressure；
Charging-discharging controller is according to cell voltage UEWith current transformer DC bus-bar voltage UDDynamic electric voltage, control charging and
The conversion of electric discharge and continuously adjust, to realize current transformer DC bus-bar voltage UDStabilization.Current-variable controller is according to power system
Active reactive regulating command, with reference to the feedback signal of power system voltage, current transformer output voltage and output current, calculate and become
Flow voltage and phase corresponding to the output voltage of device, control current transformer output required voltage.Wherein in the form of control instruction
On, including the active command and inductive reactive power, the reactive command of capacitive reactive power for charging, discharging, so as to single-phase alternating current-direct current
Converter loop realizes control, so as to have foot in four quadrant jobs, output PWM sine voltages, capacitor (group)
Enough big capacity, meet the requirement of current transformer simulation synchronous generator dynamics.
Fig. 2 show the battery energy storage embodiment schematic diagram for working in three-phase alternating current loop, its principle and single-phase loop
Principle is consistent.
Specifically realized for above-mentioned system using following control method：
(1) wherein charging-discharging controller is to DC bus-bar voltage UDUsing Isobarically Control, by great-capacity power battery E charge and discharges
Electrical circuit controller is realized, when detecting UDThen great-capacity power battery E is charged during rise, when detecting UDIt is then big during reduction
Capacity power battery E electric discharge supplements；
(2) current transformer output voltage U0It is that output is realized so under the control of current-variable controller
Output current of converter I0=S0/US, S0For the output capacity of whole flexible power system, the expression of the capacity can
For power output, it is controlled depending on the setting of system or user to current-variable controller, wherein the control mode of the setting
So that：I0Any value changes in the circle for a four-quadrant being limited with current transformer maximum output ability so that can realize
Work(, idle regulation output, fully meet the diversified demand of electric power demand side.
Thus current transformer output reactance voltage Ul=I0*Xl, XlFor connection current transformer and the reactance value of power network.
The output voltage U of current transformer0=US+Ul=US+I0*Xl
(3)I0Arbitrary value exports in the circle for a four-quadrant being limited with current transformer maximum output ability,
Vector analysis figure as shown in Figure 3, the core control thought and strategy of the present invention are reflected, i.e., according to of the invention real
Existing flexible power system, control is realized in a manner mentioned above, specifically can controlled so that realizing output I0With as follows
Mode change, I0According to as follows in arbitrary value in the circle for a four-quadrant being limited with current transformer maximum output ability
Mode changes：
I0Circumferentially change：Current transformer output characteristics corresponds to maximum apparent energy output, corresponding different in different quadrants
Function, first to fourth quadrant are respectively perceptual charging, capacitive charging, capacitive discharge, perception electric discharge.
I0Change along the longitudinal axis：Pure active discharge and recharge, adjusted between peak power charging and peak power electric discharge, power
Factor is 1.
I0Change along transverse axis：Pure idle output, battery are idle to be adjusted between maximum capacitive and maximum inductive without discharge and recharge
Section.
I0Along the profound change in longitudinal direction：Output characteristics is adjusted for the discharge and recharge of permanent idle output.
I0Along laterally profound change：Output characteristics is the Reactive-power control of permanent active discharge and recharge.
I0Change along vertical radius of circle：Output characteristics is adjusted for the discharge and recharge of constant power factor.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (3)
1. it is a kind of based on battery energy storage exchange flexible power system control method, the control method based on the exchange
Flexible power system includes battery in parallel successively, battery charging and discharging loop, AC/DC converter loop, reactor, in addition to
The capacitor bank being arranged between the battery charging and discharging loop and the AC/DC converter loop, it is characterised in that described
Exchange flexible power system also includes charging and discharging circuit controller and AC/DC converter loop control unit, wherein the discharge and recharge
Loop control unit, which is used to realize the charging and discharging circuit, to be controlled, and the AC/DC converter loop control unit is used for the friendship
Realize control in DC transformer loop；
The control mode of wherein described charging and discharging circuit controller is to monitor the cell voltage U in real timeEBecome with the alternating current-direct current
Flow device loop DC bus-bar voltage UDDynamic electric voltage, control the regulation of the charging and discharging in the battery charging and discharging loop, its
Described in charging-discharging controller to DC bus-bar voltage UDUsing Isobarically Control, by great-capacity power battery E charging and discharging circuit controls
Device processed realizes, when detecting UDThen great-capacity power battery E is charged during rise, when detecting UDThen high-capacity dynamical during reduction
Battery E electric discharge supplements so that the DC bus-bar voltage UDKeep stable；
The control mode of wherein described AC/DC converter loop control unit is to export active and/or idle drive signal to give institute
State AC/DC converter loop so that the output current I in the AC/DC converter loop0Returned with the AC/DC converter
Any value changes in the circle for the four-quadrant that current transformer maximum output ability in road is limited so that can realize it is active and/
Or idle regulation output.
2. a kind of control method of exchange flexible power system based on battery energy storage as claimed in claim 1, its feature exist
In, in the control mode of the AC/DC converter loop control unit, the current transformer output in the AC/DC converter loop
Current value be：I0=S0/US, S0For the output capacity of the whole exchange flexible power system, the value is become by the alternating current-direct current
Flow the setting that device loop control unit receives to determine, USFor voltage on line side；Current transformer output in the AC/DC converter loop
Magnitude of voltage be：U0=US+Ul=US+I0*Xl, wherein Xl is the reactance value for connecting the current transformer and power network.
3. the control method of the exchange flexible power system of battery energy storage as claimed in claim 1 or 2, it is characterised in that
Under the control of the AC/DC converter loop control unit, the output I0Variation pattern it is as follows：
I0Circumferentially change：The corresponding maximum apparent energy output of current transformer output in the AC/DC converter loop, not
Difference in functionality is corresponded to quadrant, is respectively perceptual charging, capacitive charging, capacitive discharge, perception electric discharge from first to fourth quadrant；
I0Change along the longitudinal axis：Pure active discharge and recharge, adjusted between peak power charging and peak power electric discharge, power factor
For 1；
I0Change along transverse axis：Pure idle output, the battery are idle to be adjusted between maximum capacitive and maximum inductive without discharge and recharge
Section；
I0Change along longitudinal chord：Output characteristics is adjusted for the discharge and recharge of permanent idle output；
I0Change along horizontal string：Output characteristics is the Reactive-power control of permanent active discharge and recharge, I0Change along radius of circle：Output
Characteristic is adjusted for the discharge and recharge of constant power factor.
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| US7834480B2 (en) * | 2007-06-20 | 2010-11-16 | Mesta Electronics, Inc. | Energy converter system with reactive-power-management |
| KR101243909B1 (en) * | 2010-12-16 | 2013-03-14 | 삼성에스디아이 주식회사 | System for energy storage and control method thereof |
| JP2013192413A (en) * | 2012-03-15 | 2013-09-26 | Omron Corp | Electric storage device control method, electric storage device control apparatus, and electric storage device control system |
| CN104467031B (en) * | 2014-12-11 | 2016-06-22 | 电子科技大学 | The reactive power distribution method of battery energy storage power station |
| CN104993494B (en) * | 2015-05-22 | 2017-05-17 | 国网河南省电力公司电力科学研究院 | Motor simulator based on four-quadrant power electronic converter and method |
| CN105226693B (en) * | 2015-10-13 | 2017-08-18 | 辽宁立德电力电子股份有限公司 | A kind of four-quadrant bidirectional energy-storage inverter based on IGBT technologies |
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Effective date of registration: 20190916 Address after: 430074 No.3 Guanggu Avenue, Wuhan Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: Hubei Chuntian Electrical Technology Co., Ltd. Address before: 441053 No. 296 Longzhong Road, Xiangfan City, Hubei Province Patentee before: Hubei University of Arts and Science |
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