CN207200618U - A kind of hybrid energy-storing control device of photovoltaic system - Google Patents
A kind of hybrid energy-storing control device of photovoltaic system Download PDFInfo
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- CN207200618U CN207200618U CN201720823753.1U CN201720823753U CN207200618U CN 207200618 U CN207200618 U CN 207200618U CN 201720823753 U CN201720823753 U CN 201720823753U CN 207200618 U CN207200618 U CN 207200618U
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- Prior art keywords
- controller
- hybrid energy
- super capacitor
- bus
- lithium battery
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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
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
A kind of hybrid energy-storing control device of photovoltaic system, it can be that a kind of structure for being combined together a variety of energy storage modes is simple, easily realized, workable hybrid energy-storing control device with overcome the deficiencies in the prior art；For lithium battery stable DC busbar voltage to maintain the energy equilibrium of supply and demand on bus, super capacitor supplies fluctuation of load power high frequency component immediately, and suppress load changing influences to caused by dc bus；The utilization rate of super capacitor is improved, reduces capacity requirement of the system to super capacitor.
Description
(1) technical field：
Micro-capacitance sensor or distributed generation system field are the utility model is related to, especially a kind of hybrid energy-storing of photovoltaic system
Control device.
(2) background technology：
As the progress and expanding economy of society, the mankind are growing to the demand of the energy.Photovoltaic energy is as a kind of
Reproducible clean energy resource, national governments' attention is just being increasingly subject to, is being greatly developed.However, due to by intensity of illumination, ring
The external environment influences such as border temperature, cause photovoltaic generation in the prevalence of for the unbalanced phenomenon of electricity consumption.Therefore, it is necessary to be photovoltaic
Electricity generation system is equipped with the energy-storage system of certain capacity.
As energy storage component, ultracapacitor and battery have very big difference：The direct energy storage effect of ultracapacitor
Rate be it is very high, can close to 100% ideal value；And battery needs chemical conversion, under " standard charging " state, turn
It is 1/1.5 (10 hours discharge rates will charge 15 hours) to change efficiency.In practice, heating during ultracapacitor charge and discharge
Very little is measured, and the heating of battery is relatively large.Particularly heavy-current discharge when, the pole plate of battery can deform, often big electricity
Electricity is banished it is also possible to making pole plate be broken and scrap." ultracapacitor and accumulator hybrid energy-storing " will have quarantine measures, otherwise
It can involve mutually (both internal resistances are different, and discharge voltage is different, both be present " mutually fill " phenomenon reduce efficiency).Lithium battery its
Light, small volume, energy density is big, meets requirement of the distributed power generation to energy density.The shortcomings that lithium battery, is, by electrification
The influence of reaction rate is learned, its power density is smaller, when bearing power is mutated, it is difficult to meet the dynamic requirements of system.It is super
Physical change is happens is that inside during capacitor charge and discharge, power density is a big feature of super capacitor greatly, can instantaneously be provided
Relatively high power, shortcoming are that its energy density is relatively low, therefore the complementarity in performance is very strong with super capacitor for lithium battery, naturally may be used
To consider both being bonded mixed energy storage system, both advantages are given full play to, greatly improve systematic function.
(3) utility model content：
The purpose of this utility model is the hybrid energy-storing control device for providing a kind of photovoltaic system, and it can overcome existing
The deficiency of technology, it is that a kind of structure for being combined together a variety of energy storage modes is simple, easily realizes, workable mixing
Energy storage control device.
The technical solution of the utility model：A kind of hybrid energy-storing control device of photovoltaic system, including load, direct current mother
Line, photovoltaic generation unit, it is characterised in that it includes hybrid energy-storing unit, power converter cells, PWM units and controller unit；
Wherein, the controller unit is made up of 2 controller modules, is power converter cells controller I and hybrid energy-storing unit respectively
Charging-discharging controller module；The hybrid energy-storing unit is in be bi-directionally connected with dc bus according to power converter cells and PWM units；Institute
It is load supplying to state hybrid energy-storing unit；The charging and discharging currents letter of the power converter cells controller I collections hybrid energy-storing unit
Number and DC bus-bar voltage signal, power converter cells are operated with the control of pattern；The hybrid energy-storing unit charge and discharge is automatically controlled
The terminal voltage and charging and discharging currents signal of the input collection hybrid energy-storing unit of device module processed, fill to hybrid energy-storing unit
Control of discharge.
The hybrid energy-storing unit is made up of lithium battery and super capacitor, and the lithium battery is to maintain energy on dc bus
Measure the V-f distributed power sources that the equilibrium of supply and demand provides stable DC busbar voltage；The super capacitor then can be in load changing
Constant frequency is provided for microgrid, as PQ distributed power sources, reduces load changing and is impacted to caused by dc bus；The lithium
Battery passes sequentially through power converter cells with super capacitor and is connected with dc bus.
The power converter cells are DC-DC reversible transducers or by DC-AC converters and AC-DC converter structure
Into power converter cells.
The DC-DC reversible transducers are by switching tube S1, switching tube S2, diode VD1, diode VD2 and electric capacity C1
Form；The diode VD1, diode VD2 are connected in parallel on switching tube S1, switching tube S2 collector and emitter both ends respectively；
The electric capacity C1 is connected in parallel on the switching tube S1 being serially connected, switching tube S2 both ends；The hybrid energy-storing unit can be with equivalent into electricity
Hold C, the circuit structure that internal resistance R and inductance L are serially connected, one end is connected to switching tube S1, switching tube S2 series connection intermediate point, separately
One end is connected with electric capacity C1；The load can be connected in parallel on electric capacity C1 both ends with equivalent into resistance RL.
The hybrid energy-storing device unit charge and discharge control module is made up of three controllers, is denoted as controller II, control respectively
Device III and controller IV processed；The controller I collection charging and discharging lithium battery electric currents and DC bus-bar voltage, control converter list
Member works in single-ended potentiostatic mode, the voltage of stable DC bus；The controller II collection super capacitor side pressures and discharge and recharge
Electric current, to realize the control to super capacitor charge-discharge electric power, release or absorption are mutated the high-frequency signal of power to lithium battery, led to
Cross the discharge and recharge of controller IV control lithium batteries；The controller III adopts when bearing power undulating value is less than the threshold value of setting
Collect the electric current and terminal voltage of super capacitor, modified constant-voltage charge control is carried out to super capacitor；The controller IV is to lithium battery
Carry out charge and discharge control.
Operation principle of the present utility model：
(1) charging and discharging lithium battery electric current and DC bus-bar voltage are gathered by controller I, and according to given dc bus electricity
Pressure value control power converter cells work in single-ended potentiostatic mode, the voltage of stable DC bus；
(2) P is setload、PLi、Pc、PpvThe respectively power of load, lithium battery, super capacitor and photovoltaic cell, then can be with
The power loaded should meet：Pload=PLi+Ppv+Pc；
(3) detection of high fdrequency component is carried out to bearing power；If Pc-refFor load changing when super capacitor high frequency power
Specified rate, it can be seen from the general expression of single pole high pass filter：
Wherein, K is proportionality coefficient；S is operator；ω0For frequency.
(4) controller II gathers super capacitor terminal voltage and charging and discharging currents, and ring is detected according to bearing power high fdrequency component
The high frequency power signals of section, the size of the real-time charging and discharging currents value of super capacitor is drawn, to realize to super capacitor charge and discharge electric work
The high-frequency signal of the control of rate, release or absorption mutation power passes through the discharge and recharge that controller IV controls lithium battery to lithium battery；
(5) charge-discharge electric power of super capacitor in itself is determined；Now, if load capacity becomes big suddenly, it is thus necessary to determine that be
The power and the size of discharge current that super capacitor should discharge；And when when load reduction suddenly, then need to determine super capacitor
The power and the size of charging current to be absorbed；
The charge-discharge electric power P of super capacitorcFor：
Pc=VcIc
Wherein, VcFor the voltage at super capacitor both ends, IcFor the electric current in super capacitor branch；
When load increase suddenly, the filtered super capacitor power drawn gives Pc-refFor on the occasion of i.e. now super electricity
Holding the power that discharge is：
Now, super capacitor discharge current should be：
When load reduces suddenly, the P that draws after filteringc-refFor negative value, i.e., now super capacitor should absorbed power,
For：Pc=VcIc=Pc-refμ；
Now, the charging current of super capacitor is：
When load increases or reduced suddenly suddenly, controller II is according to super capacitor discharge current and the meter of charging current
Calculate result, you can realize the control to super capacitor power；
(6) when load power swing value be less than setting threshold value when, controller III then gather super capacitor electric current and
Terminal voltage, modified constant-voltage charge is carried out according to the super capacitor side pressure reference value of setting, this can make the voltage value of super capacitor
Setting value is maintained, is prepared for load changing next time；
(7) operate in lithium battery cross put when, lithium battery can not maintain busbar voltage stable, answer disconnecting consumers,
Charge control is carried out to lithium battery by controller IV, according to the terminal voltage and electric current of the lithium battery collected, constant pressure is carried out to it
Current-limiting charge.
Superiority of the present utility model：Lithium battery and super capacitor are connected to direct current by bi-directional half bridge converter respectively
Form mixed energy storage system on bus, lithium battery stable DC busbar voltage is to maintain the energy equilibrium of supply and demand on bus, super electricity
Hold and supply fluctuation of load power high frequency component immediately, suppress load changing influences to caused by dc bus.Modified constant-voltage charge
Link can make its terminal voltage return to set-point after load changing to super capacitor auto charge and discharge, for load changing next time
Prepare, drastically increase the utilization rate of super capacitor, reduce capacity requirement of the system to super capacitor.
(4) illustrate：
Fig. 1 is a kind of overall structure figure block diagram of the hybrid energy-storing control device of photovoltaic system involved by the utility model.
Fig. 2 is the bi-directional half bridge converter in the hybrid energy-storing control device of a kind of photovoltaic system involved by the utility model
Circuit structure diagram.
Fig. 3 is a kind of hybrid energy-storing control device workflow schematic diagram of photovoltaic system involved by the utility model.
(5) embodiment：
Embodiment：A kind of hybrid energy-storing control device (see Fig. 1) of photovoltaic system, including load, dc bus, in microgrid
Generator unit, it is characterised in that it includes hybrid energy-storing unit, power converter cells, PWM units and controller unit；Wherein, institute
State controller unit to be made up of 2 controller modules, be that power converter cells controller I and hybrid energy-storing unit charge and discharge are automatically controlled respectively
Device module processed；The hybrid energy-storing unit is in be bi-directionally connected with dc bus according to power converter cells and PWM units；The mixing storage
Energy unit is load supplying；The charging and discharging currents signal and direct current of the power converter cells controller I collections hybrid energy-storing unit
Bus voltage signal, power converter cells are operated with the control of pattern；The hybrid energy-storing unit charging-discharging controller module
Input collection hybrid energy-storing unit terminal voltage and charging and discharging currents signal, to hybrid energy-storing unit carry out charge and discharge it is automatically controlled
System.
The hybrid energy-storing unit (see Fig. 1) is made up of lithium battery and super capacitor, and the lithium battery is to maintain direct current
The energy equilibrium of supply and demand provides the V-f distributed power sources of stable DC busbar voltage on bus；The super capacitor then can be negative
Constant frequency is provided for microgrid when carrying mutation, as PQ distributed power sources, reduces load changing and is rushed to caused by dc bus
Hit；The lithium battery passes sequentially through power converter cells with super capacitor and is connected with dc bus.
The power converter cells are DC-DC reversible transducers (see Fig. 1) or become by DC-AC converters and AC-DC
The power converter cells that parallel operation is formed.
The DC-DC reversible transducers are by switching tube S1, switching tube S2, diode VD1, diode VD2 (see Fig. 2)
Formed with electric capacity C1；The diode VD1, diode VD2 are connected in parallel on switching tube S1, switching tube S2 colelctor electrode and transmitting respectively
Pole both ends；The electric capacity C1 is connected in parallel on the switching tube S1 being serially connected, switching tube S2 both ends；The hybrid energy-storing unit can wait
The circuit structure that electric capacity C, internal resistance R and inductance L are serially connected is imitated into, one end is connected in switching tube S1, switching tube S2 series connection
Between point, the other end is connected with electric capacity C1；The load can be connected in parallel on electric capacity C1 both ends with equivalent into resistance RL.
The hybrid energy-storing device unit charge and discharge control module forms (see Fig. 1) by three controllers, is denoted as controlling respectively
Device II, controller III and controller IV；The controller I collection charging and discharging lithium battery electric currents and DC bus-bar voltage, control become
Exchange unit works in single-ended potentiostatic mode, the voltage of stable DC bus；Controller II collection super capacitor side pressure and
Charging and discharging currents, to realize the control to super capacitor charge-discharge electric power, release or absorption are mutated the high-frequency signal of power to lithium
Battery, the discharge and recharge of lithium battery is controlled by controller IV；The controller III is less than the threshold of setting in bearing power undulating value
During value, the electric current and terminal voltage of super capacitor are gathered, modified constant-voltage charge control is carried out to super capacitor；IV pairs of the controller
Lithium battery carries out charge and discharge control.
Claims (5)
1. a kind of hybrid energy-storing control device of photovoltaic system, including load, dc bus, photovoltaic generation unit, its feature exist
Include hybrid energy-storing unit, power converter cells, PWM units and controller unit in it；Wherein, the controller unit is by 2
Controller module is formed, and is power converter cells controller I and hybrid energy-storing unit charging-discharging controller module respectively；The mixing
Energy-storage units are in be bi-directionally connected with dc bus according to power converter cells and PWM units；The hybrid energy-storing unit is load supplying；
The charging and discharging currents signal and DC bus-bar voltage signal of the power converter cells controller I collections hybrid energy-storing unit, to becoming
Exchange unit is operated the control of pattern；The input collection mixing storage of the hybrid energy-storing unit charging-discharging controller module
The terminal voltage and charging and discharging currents signal of energy unit, charge and discharge control is carried out to hybrid energy-storing unit.
A kind of 2. hybrid energy-storing control device of photovoltaic system according to claim 1, it is characterised in that the hybrid energy-storing
Unit is made up of lithium battery and super capacitor, the lithium battery be maintain dc bus on the energy equilibrium of supply and demand provide stablize it is straight
Flow the V-f distributed power sources of busbar voltage；The super capacitor can then provide constant frequency in load changing for microgrid,
As PQ distributed power sources, reduce load changing and impacted to caused by dc bus；The lithium battery and super capacitor are successively
It is connected by power converter cells with dc bus.
A kind of 3. hybrid energy-storing control device of photovoltaic system according to claim 1, it is characterised in that the converter list
Member is DC-DC reversible transducers or the power converter cells being made up of DC-AC converters and AC-DC converter.
4. the hybrid energy-storing control device of a kind of photovoltaic system according to claim 3, it is characterised in that the DC-DC is two-way
Converter is made up of switching tube S1, switching tube S2, diode VD1, diode VD2 and electric capacity C1；The diode VD1, two
Pole pipe VD2 is connected in parallel on switching tube S1, switching tube S2 collector and emitter both ends respectively；The electric capacity C1 is connected in parallel on mutual string
The switching tube S1 of connection, switching tube S2 both ends；The hybrid energy-storing unit can mutually be gone here and there with equivalent into electric capacity C, internal resistance R and inductance L
The circuit structure of connection, one end are connected to switching tube S1, switching tube S2 series connection intermediate point, and the other end is connected with electric capacity C1；It is described
Load can be connected in parallel on electric capacity C1 both ends with equivalent into resistance RL.
A kind of 5. hybrid energy-storing control device of photovoltaic system according to claim 1, it is characterised in that the hybrid energy-storing
Device unit charge and discharge control module is made up of three controllers, is denoted as controller II, controller III and controller IV respectively；Institute
Controller I collection charging and discharging lithium battery electric currents and DC bus-bar voltage are stated, control power converter cells work in single-ended potentiostatic mode,
The voltage of stable DC bus；The controller II collection super capacitor side pressures and charging and discharging currents, to realize to super capacitor
The high-frequency signal of the control of charge-discharge electric power, release or absorption mutation power passes through controller IV and controls lithium battery to lithium battery
Discharge and recharge；The controller III gathers electric current and the end of super capacitor when bearing power undulating value is less than the threshold value of setting
Voltage, modified constant-voltage charge control is carried out to super capacitor；The controller IV carries out charge and discharge control to lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720823753.1U CN207200618U (en) | 2017-07-07 | 2017-07-07 | A kind of hybrid energy-storing control device of photovoltaic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720823753.1U CN207200618U (en) | 2017-07-07 | 2017-07-07 | A kind of hybrid energy-storing control device of photovoltaic system |
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| Publication Number | Publication Date |
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| CN207200618U true CN207200618U (en) | 2018-04-06 |
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| CN201720823753.1U Expired - Fee Related CN207200618U (en) | 2017-07-07 | 2017-07-07 | A kind of hybrid energy-storing control device of photovoltaic system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054422A (en) * | 2023-04-03 | 2023-05-02 | 宁德时代新能源科技股份有限公司 | Energy storage device and energy storage system |
-
2017
- 2017-07-07 CN CN201720823753.1U patent/CN207200618U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054422A (en) * | 2023-04-03 | 2023-05-02 | 宁德时代新能源科技股份有限公司 | Energy storage device and energy storage system |
| CN116054422B (en) * | 2023-04-03 | 2023-08-11 | 宁德时代新能源科技股份有限公司 | Energy storage device and energy storage system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180406 Termination date: 20210707 |
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| CF01 | Termination of patent right due to non-payment of annual fee |