CN104300579A - Method for charging controller to have control over charging of storage battery - Google Patents
Method for charging controller to have control over charging of storage battery Download PDFInfo
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- CN104300579A CN104300579A CN201410546641.7A CN201410546641A CN104300579A CN 104300579 A CN104300579 A CN 104300579A CN 201410546641 A CN201410546641 A CN 201410546641A CN 104300579 A CN104300579 A CN 104300579A
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- voltage
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000007600 charging Methods 0.000 title claims abstract description 25
- 230000009977 dual effect Effects 0.000 claims description 35
- 238000007667 floating Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000010280 constant potential charging Methods 0.000 abstract 1
- 238000010277 constant-current charging Methods 0.000 abstract 1
- 238000011217 control strategy Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a method for a charging controller to have control over charging of a storage battery. Direct-current current loop control is adopted for an inner loop, direct-current voltage loop control is adopted for an outer loop, and photovoltaic cell panel direct-current voltage outer loop control or storage battery direct-current voltage outer loop control is selected as direct-current voltage loop control according to the on-grid or off-grid state of a dual-mode inverter and the state of the storage battery. When the dual-mode inverter runs in an on-grid mode, or the dual-mode inverter runs in an off-grid mode and the storage battery is in a constant-current charging state, the control mode that a photovoltaic cell panel direct-current voltage outer loop and a direct-current current loop work at the same time is adopted for the charging controller. When the dual-mode inverter runs in the off-grid mode and the storage battery is in the constant-voltage charging state, the control mode that a storage battery voltage outer loop and a direct-current current loop work at the same time is adopted for the charging controller. The two direct-current voltage loops form a PI adjuster, and when photovoltaic cell panel direct-current voltage outer loop control and storage battery direct-current voltage outer loop control are switched, given direct-current voltage and feedback direct-current voltage are switched. Three-phase staggered modulation is adopted for the charging controller.
Description
Technical field
The present invention relates to a kind of control method of charge in batteries.
Background technology
Charge controller connects photovoltaic battery panel and the hinge by electric loading.Because photovoltaic battery panel output voltage is unstable, so directly photovoltaic battery panel can not be applied to load, be stored in storage battery after needing to change solar energy into electric energy, then powered to the load by storage battery.Charge controller detects the state of storage battery in real time, charges to storage battery according to Optimal Control Strategy.
In centralized high-power light storage integrated applied system, photovoltaic battery panel by the charging of charge controller accumulators group, and sets up DC bus (DC-Link) by batteries, after connect dual mode inverter.This dual mode inverter, need grid-connected and from switch operating between net control model according to the work state information of photovoltaic plant.Being connected by setting up communication between dual mode inverter with photovoltaic charge controller, providing charge controller power grid state information by inverter.Charge controller and dual mode inverter are full decoupled by storage battery, charge controller can according to dual mode inverter and from net state, take optimum control strategy stable operation, realize the charging to batteries.Making full use of light resources to keep time grid-connected, when storage battery is full, photovoltaic energy need be directly incorporated into electrical network.Concrete control block diagram as shown in Figure 2.
At present, charge controller utilizes traditional B uck, Boost circuit as major loop mostly, realizes energy exchange and can only depend on the IGBT of some parallel connections and very large inductance to ensure required big current, cause switching loss very high in power device.Due to efficiency and switching frequency lower, output just must adopt larger inductance, if cause transient response speed slack-off raising response speed just must reduce inductance value, but this will produce very large output current spike.In addition, when adopting traditional trickle charge, quick charge, absorption charging, floating charge four-part form charging modes to control, need between each pattern to realize taking over seamlessly strategy process flexibly, control comparatively loaded down with trivial details, so in the urgent need to a kind of unified control method to realize above-mentioned functions.
CN201310060267 " a kind of charge control method of photovoltaic charge controller " is according to the control command of charge mode controller, the mode utilizing MPPT controller, storage battery pressure controller, direct current controller to combine, realizes controlling the charging of storage battery.But specifically do not provide specific works principle and the mode judging method of charge mode controller, cause the work of each controller indefinite, adopt three close-loop control more loaded down with trivial details in this control strategy in addition.
Summary of the invention
When the object of the invention is to overcome the control of existing charge controller to charge in batteries, can not to take over seamlessly between multiple state, and the shortcoming of control strategy complexity, to propose a kind ofly to be applicable to the double loop control of charge controller to charge in batteries.The present invention is according to dual mode inverter and from the difference of net state and battery condition, adopt photovoltaic battery panel direct voltage outer shroud and accumulator DC pressure outer shroud take over seamlessly control method, can utilize luminous energy to greatest extent, control method is simple, switches flexibly without impacting.
Technical scheme of the present invention is as follows:
Charge controller of the present invention adopts double loop control to charge in batteries: inner ring is that direct current ring controls, and outer shroud is that direct current pressure ring controls.This direct current pressure ring control according to dual mode inverter and from the state of net state and storage battery, select photovoltaic battery panel direct voltage outer shroud to control or accumulator DC pressure outer shroud controls.When dual mode inverter is incorporated into the power networks, or dual mode inverter from network operation and storage battery is in constant current charge state time, charge controller adopt simultaneously photovoltaic battery panel direct voltage outer shroud control and direct current ring control mode; When dual mode inverter from network operation and storage battery is in constant voltage charge state time, charge controller adopt simultaneously accumulator DC press outer shroud control and direct current ring control mode.Two kinds of described direct current pressure rings share a set of pi regulator, photovoltaic battery panel direct voltage outer shroud controls and accumulator DC pressure outer shroud control switching only switches constantly between the given of direct voltage and feedback, can ensure taking over seamlessly without impact of direct current pressure ring without the need to special switchover policy.Described charge controller adopts three staggered modulation, reduces the ripple of voltage, electric current.Control method of the present invention drastically increases the utilance of luminous energy, makes charge in batteries reach optimum, control method simple and flexible, fast response time.
Concrete control method of the present invention is as follows:
Charge controller adopts double loop control, and inner ring is that direct current ring controls, and outer shroud is that direct current pressure ring controls.Wherein direct current pressure ring controls to comprise two kinds of modes: one is that photovoltaic battery panel direct voltage outer shroud controls, and another kind is that accumulator DC pressure outer shroud controls.The selection principle of described direct current pressure ring control method is: if dual mode inverter is in the state of being incorporated into the power networks, and charge controller adopts photovoltaic cell direct voltage outer shroud to control; If dual mode inverter is in from Running State, charge controller, according to the charged state of storage battery, selects photovoltaic battery DC voltage outer shroud to control or the control of accumulator DC pressure outer shroud.
When dual mode inverter is in the state of being incorporated into the power networks, or dual mode inverter is in from Running State and storage battery is in constant current charge state time, charge controller adopts the mode that photovoltaic battery panel direct voltage outer shroud controls and direct current ring controls simultaneously, to ensure luminous energy peak use rate.The output of photovoltaic battery panel direct voltage outer shroud is after direct current amplitude limit value amplitude limit, given as direct current.
When dual mode inverter is in from Running State and storage battery is in constant voltage charge state, charge controller adopts the mode that battery tension outer shroud controls and direct current ring controls simultaneously.The output of accumulator DC pressure outer shroud is after the amplitude limit of direct current amplitude limit value, given as direct current.
The constant current charge state of storage battery comprises trickle charge and constant current voltage limiting charged state; The constant voltage charge state of storage battery comprises constant voltage charge state and floating charge constant voltage charge state.
Direct current pressure ring described in two kinds shares a set of PI controller.Switching between two kinds of direct current pressure rings is the switching between the given of direct voltage ring and feedback.When photovoltaic battery panel direct voltage outer shroud controls, using given as direct voltage for the magnitude of voltage after MPPT maximum power point tracking disturbance, the voltage of photovoltaic battery panel as feedback, the voltage of photovoltaic battery panel and this direct voltage given between error amount as the input of pi regulator; When battery tension outer shroud controls, using given as direct voltage for storage battery constant voltage charge magnitude of voltage, the voltage of storage battery as feedback, the voltage of storage battery and this direct voltage given between error amount as the input of pi regulator.
According to dual mode inverter and from the difference of net state and battery tension, the given amplitude limit value of direct current is different.When dual mode inverter be in from Running State and battery tension lower than battery voltage threshold one, described battery voltage threshold one is lower than battery voltage threshold two, and according to battery characteristics, now the given amplitude limit value of direct current limits by trickle charge amplitude limit value.When battery tension is higher than battery voltage threshold one, or dual mode inverter be operated in and net state time, the given amplitude limit value of direct current is by the restriction of charge controller maximum charging current, and this pairs of maximum charging current values is determined by the parameter of charge controller own.
Accompanying drawing explanation
The overall control block diagram of Fig. 1 charge controller of the present invention;
Fig. 2 light storage integral application block diagram;
Fig. 3 Battery charge controller strategic process figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described further.
As shown in Figure 1, control method of the present invention is specific as follows:
The voltage that photovoltaic battery panel exports, the voltage of electric current and storage battery, output current are recorded by the voltage sensor of charge controller DC side and current sensor respectively.
Charge controller adopts double loop control, and inner ring is that direct current ring controls, and outer shroud is that direct current pressure ring controls.Wherein direct current pressure ring controls to comprise two kinds of modes: one is that photovoltaic battery panel direct voltage outer shroud controls, and another kind is that accumulator DC pressure outer shroud controls.The selection principle of described direct current pressure ring control method is: if dual mode inverter is in the state of being incorporated into the power networks, and charge controller adopts photovoltaic battery panel direct voltage outer shroud control mode; If dual mode inverter is in from Running State, charge controller, according to the charged state of storage battery, selects photovoltaic battery panel direct voltage outer shroud to control or accumulator DC pressure outer shroud control mode.
Dual mode inverter is incorporated into the power networks under state, or dual mode inverter is in from Running State and storage battery is in constant current charge state time, charge controller adopts photovoltaic battery panel direct voltage outer shroud to control simultaneously and direct current ring controls, and the given and feedback of photovoltaic battery panel direct voltage outer shroud is provided by the outer ring controller 101 of photovoltaic battery panel direct voltage.
The set-point of the direct voltage needed for photovoltaic battery panel direct voltage outer shroud controls, is mainly utilized maximum power point tracing method, is realized by disturbance observation.Ratio juris is observed in disturbance: according to the P-V characteristic of photovoltaic battery panel, maximum power point MPP is found by disturbance terminal voltage, the i.e. operational voltage value (V+ Δ V) of periodically disturbed sun energy battery, compare the changed power before and after its disturbance again, if output power value increases, then represent that perturbation direction is correct, can (+Δ V) disturbance in the same direction; If output power value reduces, then toward contrary (-Δ V) direction disturbance.Solar cell power output is made to be tending towards maximum by continuous disturbance.Direct voltage value of feedback needed for photovoltaic battery panel direct voltage outer shroud controls is the magnitude of voltage of photovoltaic battery panel.
When dual mode inverter from network operation and storage battery is in modified constant-voltage charge state time, charge controller adopt simultaneously accumulator DC press outer shroud control and direct current ring control.
The state of described storage battery is according to battery characteristics and traditional four-part form charging control mode, in conjunction with the current voltage value of storage battery, judges the charged state residing for storage battery.Tradition four-part form charging control mode is divided into trickle charge, constant current voltage limiting charging, modified constant-voltage charge, and floating charge constant voltage charge; The battery state of charge that different control modes is corresponding different: wherein trickle charge state and constant current voltage limiting charged state, be referred to as constant current charge state; Modified constant-voltage charge state and floating charge constant voltage charge state, be referred to as constant voltage charge state.Concrete Battery charge controller strategy as shown in Figure 3.
When battery tension is lower than battery voltage threshold two, storage battery is in trickle charge state or constant current voltage limiting charged state, and charge controller adopts photovoltaic battery panel direct voltage outer shroud to control and direct current ring controls; When battery tension is higher than battery voltage threshold two, storage battery is in modified constant-voltage charge state or floating charge constant voltage charge state, and charge controller adopts accumulator DC pressure outer shroud to control and direct current ring controls.The output of direct current pressure ring, after the given amplitude limit of direct current, is re-used as the given of direct current ring.
The given amplitude limit of described direct current, also according to dual mode inverter and different from the difference of net state and battery condition.When dual mode inverter be in from Running State and battery tension lower than battery voltage threshold one, described battery voltage threshold one is lower than battery voltage threshold two, and according to battery characteristics, now the given amplitude limit value of direct current limits by trickle charge amplitude limit value.When battery tension is higher than battery voltage threshold one, or dual mode inverter be operated in and net state time, the given amplitude limit value of direct current is by the restriction of charge controller maximum charging current, and this pairs of maximum charging current values is determined by the parameter of charge controller own.Battery voltage threshold one and battery voltage threshold two are determined by battery characteristics.
Two kinds of described direct current pressure rings share a set of PI controller, the switching between two kinds of direct current pressure rings, and essence is the switching between the given of direct current pressure ring and feedback.When photovoltaic battery panel direct voltage outer shroud controls, using given as direct voltage for the magnitude of voltage after MPPT maximum power point tracking disturbance, the voltage of photovoltaic battery panel is as feedback; When accumulator DC pressure outer shroud controls, using given as direct voltage for storage battery constant voltage charge magnitude of voltage, the voltage of storage battery is as feedback.
The difference of the given and feedback of direct current pressure ring is used for the control of direct current, and pi regulator output valve, through direct current amplitude limiting processing, obtains the set-point of direct current ring
the value of feedback of direct current ring controller 103 be three-phase reactor electric current and, again through direct current ring pi regulator, export three-phase cmpr value, then three-phase interleaving technique is utilized, through PWM, obtain the pwm control signal of charge controller main circuit IGBT switch, drive it to realize charge controller and charging control is carried out to storage battery.
Claims (6)
1. charge controller is to a control method for charge in batteries, it is characterized in that, described charge controller adopts double loop control: inner ring controls as direct current ring controls, and outer shroud controls as direct current pressure ring controls; Described direct current pressure ring controls to be according to dual mode inverter and from the state of net state and storage battery, photovoltaic battery panel direct voltage outer shroud is selected to control or the control of accumulator DC pressure outer shroud: when dual mode inverter is incorporated into the power networks, or dual mode inverter from network operation and storage battery is in constant current charge state time, charge controller adopt simultaneously photovoltaic battery panel direct current pressure ring control and direct current ring control mode; When dual mode inverter from network operation and storage battery is in constant voltage charge state time, charge controller adopt simultaneously accumulator DC press outer shroud control and direct current ring control mode; Two kinds of described direct current pressure rings control as a set of pi regulator, only switch between the given of direct voltage and feedback when photovoltaic battery panel direct voltage outer shroud controls and accumulator DC pressure outer shroud controls conversion.
2. charge controller according to claim 1 is to the control method of charge in batteries, it is characterized in that, the selection principle of described outer loop control method is: if dual mode inverter is in the state of being incorporated into the power networks, and charge controller adopts photovoltaic cell direct voltage outer shroud to control; If dual mode inverter is in from Running State, charge controller, according to the charged state of storage battery, selects photovoltaic battery panel direct voltage outer shroud to control or the control of accumulator DC pressure outer shroud.
3. charge controller according to claim 1 and 2 is to the control method of charge in batteries, it is characterized in that, described charge controller, according to battery characteristics and traditional four-part form charging control mode, in conjunction with the current voltage of storage battery, judges the charged state residing for storage battery; Described traditional four-part form charging control mode is trickle charge, constant current voltage limiting charging, modified constant-voltage charge, and floating charge constant voltage charge; The battery state of charge that different control modes is corresponding different: described trickle charge state and constant current voltage limiting charged state, be referred to as constant current charge state; Described modified constant-voltage charge state and floating charge constant voltage charge state, be referred to as constant voltage charge state;
When battery tension is lower than battery voltage threshold two, storage battery is in constant current charge state, and charge controller adopts photovoltaic battery panel direct voltage outer shroud to control to storage battery and direct current ring controls; When battery tension is higher than battery voltage threshold two, storage battery is in constant voltage charge state, and charge controller adopts accumulator DC pressure outer shroud to control to storage battery and direct current ring controls; The output of direct current pressure ring, after the given amplitude limit of direct current, is re-used as direct current given.
4. charge controller according to claim 3 is to the control method of charge in batteries, it is characterized in that, battery tension is different from net state with dual mode inverter, and the given amplitude limit of direct current is different:
When dual mode inverter be in from Running State and battery tension lower than battery voltage threshold one, described battery voltage threshold one is lower than battery voltage threshold two, and according to battery characteristics, now the given amplitude limit value of direct current limits by trickle charge amplitude limit value; When battery tension is higher than battery voltage threshold one, or dual mode inverter be operated in and net state time, the given amplitude limit value of direct current is by the restriction of charge controller maximum charging current, and this pairs of maximum charging current values is determined by the parameter of charge controller own.
5. charge controller according to claim 1 is to the control method of charge in batteries, it is characterized in that, the control logic that two kinds of direct current pressure rings switch when controlling between the given of direct voltage and feedback is: when controlling when photovoltaic battery panel direct current pressure ring, using given as direct voltage for the magnitude of voltage after MPPT maximum power point tracking disturbance, the voltage of photovoltaic battery panel as feedback, photovoltaic battery panel voltage and this direct voltage given between error amount as the input of pi regulator; When battery tension outer shroud controls, using given as direct voltage for storage battery constant voltage charge magnitude of voltage, the voltage of storage battery as feedback, the voltage of storage battery and this direct voltage given between error amount as the input of pi regulator.
6. charge controller according to claim 1 is to the control method of charge in batteries, it is characterized in that, described charge controller adopts three staggered modulation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410546641.7A CN104300579B (en) | 2014-10-15 | 2014-10-15 | The control method that a kind of charge controller charges to battery |
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| CN201410546641.7A CN104300579B (en) | 2014-10-15 | 2014-10-15 | The control method that a kind of charge controller charges to battery |
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| CN104300579B CN104300579B (en) | 2017-03-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600732A (en) * | 2015-02-16 | 2015-05-06 | 阳光电源股份有限公司 | Method and device for controlling charge and discharge of storage battery of optical storage hybrid system |
| CN111244932A (en) * | 2020-02-24 | 2020-06-05 | 国网江苏省电力有限公司 | Energy storage multi-working-condition operation control method and device for energy router |
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| US20040189251A1 (en) * | 2003-03-28 | 2004-09-30 | Kutkut Nasser H. | Modular and reconfigurable rapid battery charger |
| CN101969281A (en) * | 2010-10-14 | 2011-02-09 | 北京四方继保自动化股份有限公司 | Coordination control and optimization method for battery energy accumulation and photovoltaic power generation based on co-direct current bus |
| CN103762628A (en) * | 2013-12-31 | 2014-04-30 | 北京科诺伟业科技股份有限公司 | Method of controlling bidirectional converter to charge and discharge storage battery |
-
2014
- 2014-10-15 CN CN201410546641.7A patent/CN104300579B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040189251A1 (en) * | 2003-03-28 | 2004-09-30 | Kutkut Nasser H. | Modular and reconfigurable rapid battery charger |
| CN101969281A (en) * | 2010-10-14 | 2011-02-09 | 北京四方继保自动化股份有限公司 | Coordination control and optimization method for battery energy accumulation and photovoltaic power generation based on co-direct current bus |
| CN103762628A (en) * | 2013-12-31 | 2014-04-30 | 北京科诺伟业科技股份有限公司 | Method of controlling bidirectional converter to charge and discharge storage battery |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104600732A (en) * | 2015-02-16 | 2015-05-06 | 阳光电源股份有限公司 | Method and device for controlling charge and discharge of storage battery of optical storage hybrid system |
| CN111244932A (en) * | 2020-02-24 | 2020-06-05 | 国网江苏省电力有限公司 | Energy storage multi-working-condition operation control method and device for energy router |
| CN111244932B (en) * | 2020-02-24 | 2021-07-06 | 国网江苏省电力有限公司 | Energy storage multi-working-condition operation control method and device for energy router |
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