CN106026202A - Power supply access device and charge and discharge control method thereof - Google Patents
Power supply access device and charge and discharge control method thereof Download PDFInfo
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- CN106026202A CN106026202A CN201610343620.4A CN201610343620A CN106026202A CN 106026202 A CN106026202 A CN 106026202A CN 201610343620 A CN201610343620 A CN 201610343620A CN 106026202 A CN106026202 A CN 106026202A
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- energy
- storage units
- charge
- access device
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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
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a power supply access device, which is used for being connected to a power generation unit and an energy storage unit and supplying a load with electricity. The power supply access device comprises a rectifier, a DC converter, an unloader, an inverter, a controller and a charge and discharge control device, wherein the rectifier is used for rectifying input of the power generation unit; the DC converter is used for boosting input of the energy storage unit, input of the power generation unit or input of rectified power generation unit; the unloader is used for releasing excess energy; the inverter is used for converting DC into AC; the charge and discharge control device is used for controlling the energy storage unit to discharge or charge; and the controller controls the charge and discharge control device. The invention further provides a charge and discharge control method of the power supply access device. According to the power supply access device provided by the invention, the charge and discharge frequency of the energy storage unit is reduced by changing the connection mode of the energy storage unit, so that the service time of the energy storage unit is prolonged; the operation cost of a micro-grid system formed by the power supply access device is reduced; and stable and reliable power supply of the micro-grid system is ensured.
Description
Technical field
The present invention relates to field of electrical control, be specifically related to a kind of power supply access device and charge/discharge control method thereof.
Background technology
The quick increase-volume of semiconductor power device, the reaching its maturity of modern control theory, the intellectuality of power system
The development developing into the micro-capacitance sensor device in micro-grid system brings opportunity.
In typical smart micro-grid system, access in order to safe efficient and make full use of distributed energy,
Including commutator, inverter, DC converter, unloader and energy-storage units, as it is shown in figure 1, blower fan and
The electric energy that photovoltaic module produces charges to energy-storage units, energy-storage units electric discharge power to direct current or AC load.
Using such structure, in micro-capacitance sensor power supply process, energy-storage units is ceaselessly charging, is discharging, and
The discharge and recharge number of times of energy-storage units is all limited, and through use after a while, energy-storage units will be scrapped,
Must change so that the operating cost of micro-grid system is higher.
Summary of the invention
In view of problems of the prior art, it is an object of the invention to provide a kind of power supply access device, by changing
Become the connected mode of energy-storage units, decrease the discharge and recharge number of times of energy-storage units, thus extend making of energy-storage units
With the time, reduce the operating cost of the micro-grid system being made up of power supply access device, it is ensured that micro-grid system is steady
Determine reliably to power.
The present invention provides a kind of power supply access device, is used for accessing generator unit and energy-storage units and powers to the load,
Power supply access device includes commutator, DC converter, unloader, inverter and controller, and commutator is used for
The rectification of generator unit input, DC converter is after to energy-storage units input, generator unit input or rectification
Generator unit input boosting, unloader is used for discharging excess energy, inverter for direct current being converted to exchange,
Power supply access device also includes charge-discharge controller, is used for controlling energy-storage units electric discharge or charging, controller
Control charge-discharge controller.
Further, charge-discharge controller is arranged between energy-storage units and high voltage bus.
Further, DC converter is BOOST booster circuit.
Further, the positive pole of energy-storage units is by the inductance of BOOST booster circuit with charge-discharge controller even
Connect, then be connected on high voltage bus by charge-discharge controller.
Further, charge-discharge controller includes half-duplex channel and controlled path, the wherein controlled path of parallel connection
During disconnection, energy-storage units is discharged by half-duplex channel, and during controlled path conducting, energy-storage units passes through controlled path
Charging.
Further, controlled path is provided with the first gate-controlled switch, and half-duplex channel is provided with for one-way conduction
Diode.
Further, power supply access device includes one or more groups energy-storage units incoming end.
Further, power supply access device includes organizing energy-storage units incoming end more, is used for accessing charge-discharge characteristic phase
Same or different energy-storage units.
Further, energy-storage units incoming end accesses the energy-storage units that charge-discharge characteristic is different, and controller is with difference
Priority or different frequencies to energy-storage units discharge.
Further, controller has battery management function.
The present invention also provides for the charge/discharge control method of a kind of above-mentioned power supply access device, comprises the following steps:
When the power of a electricity that () generator unit sends is more than the product of bearing power and the first coefficient, if energy-storage units
Underfill, controls to charge to energy-storage units；If energy-storage units has been filled with, cut out energy-storage units, start unloader；
When the power of b electricity that () generator unit sends is less than the product of bearing power and the second coefficient, control energy-storage units
Electric discharge, energy-storage units powers to the load together with generator unit；
The power of c electricity that () generator unit sends more than or equal to bearing power and the second coefficient product and less than or etc.
When bearing power is with the product of the first coefficient, cut out energy-storage units.
Further, the first coefficient is more than or equal to described second coefficient.
Compared with prior art, the power supply access device of present invention offer and charge/discharge control method thereof, have following
Beneficial effect: by changing the connected mode of energy-storage units, decrease the discharge and recharge number of times of energy-storage units, thus
Extend the use time of energy-storage units, reduce the operating cost of the micro-grid system being made up of power supply access device,
Ensure that micro-grid system is reliablely and stablely powered.
Accompanying drawing explanation
Fig. 1 is the structural representation of power supply access device of the prior art；
Fig. 2 is the structural representation of the power supply access device of one embodiment of the present of invention；
Fig. 3 is the circuit diagram of two-way BUCK-BOOST circuit and charge-discharge controller；
Fig. 4 is a kind of circuit diagram of BOOST booster circuit and charge-discharge controller；
Fig. 5 is the another kind of circuit diagram of BOOST booster circuit and charge-discharge controller；
Fig. 6 is the structural representation of the power supply access device of another embodiment of the present invention.
Detailed description of the invention
As in figure 2 it is shown, the power supply access device of one embodiment of the present of invention, it is used for accessing generator unit and storage
Energy unit also powers to the load, and power supply access device includes commutator, DC converter, unloader, inverter
With controller, commutator for generator unit input rectification, DC converter for energy-storage units input,
Generator unit input boosting after generator unit input or rectification, unloader is used for discharging excess energy, inverter
For direct current is converted to exchange, power supply access device also includes charge-discharge controller, is used for controlling energy storage list
Unit's electric discharge or charging, controller controls charge-discharge controller.
Generator unit can be direct-current generating device and/or ac power generation.
Generator unit can be one, it is also possible to is multiple.
Generator unit two in the present embodiment, generator unit includes direct-current generating device and ac power generation, Qi Zhongzhi
Stream TRT is photovoltaic module, and ac power generation is blower fan, and certain ac power generation can also be diesel generation
Machine, naturally it is also possible to only include blower fan, or only include photovoltaic, the invention is not limited in this regard.
In the present embodiment, energy-storage units is lead-acid battery.Energy-storage units can also be lead-acid battery, lithium battery, liquid
The battery such as galvanic battery or sodium-sulphur battery, the invention is not limited in this regard.
Power supply access device also includes controller, is used for controlling DC converter, unloader, inverter and charge and discharge
Controller for electric consumption.
Charge-discharge controller is arranged between energy-storage units and high voltage bus.
In the present embodiment, a kind of circuit, as it is shown on figure 3, DC converter is two-way BUCK-BOOST circuit, stores up
The positive pole of the energy unit diode D2 parallel circuit by the second gate-controlled switch Q2 with one-way conduction, is connected to double
To first end of the inductance L of BUCK-BOOST circuit, the other end ground connection of inductance L；Including the first gate-controlled switch
Q1 and the charge-discharge controller of the diode D1 of one-way conduction, be connected to the first end and the high voltage bus of inductance L
Between.
Charge-discharge controller includes half-duplex channel and the controlled path of parallel connection, when wherein controlled path disconnects, storage
Can be discharged by half-duplex channel, i.e. to load output power by unit；During controlled path conducting, energy-storage units passes through
Controlled path is charged.
Specifically, controlled path is provided with the first gate-controlled switch Q1, and half-duplex channel is provided with for one-way conduction
Diode D1, controller controls disconnection and the conducting of the first gate-controlled switch Q1 by controlling end A.
The charge/discharge control method of the power supply access device in the present embodiment, comprises the following steps:
When the power of a electricity that () generator unit sends is more than the product of bearing power and the first coefficient, if energy-storage units
Underfill, controls to charge to energy-storage units；If energy-storage units has been filled with, cut out energy-storage units, start unloader；
When the power of b electricity that () generator unit sends is less than the product of bearing power and the second coefficient, control energy-storage units
Electric discharge, energy-storage units powers to the load together with generator unit；
The power of c electricity that () generator unit sends more than or equal to bearing power and the second coefficient product and less than or etc.
When bearing power is with the product of the first coefficient, cut out energy-storage units.
Second gate-controlled switch Q2 is used for controlling whether to access energy-storage units, and concrete control flow is as follows:
(1)Time, if energy-storage units has been filled with, cut out energy-storage units, and start unloader,
Discharge unnecessary power；If energy-storage units underfill, energy-storage units is charged；
Specifically, if energy-storage units has been filled with, controller cuts out the PWM of the control end A of the first gate-controlled switch Q1
Signal, simultaneously closes off the PWM, the first gate-controlled switch Q1 of the control end B of the second gate-controlled switch Q2 and second controlled
Switch Q2 is in off-state, cuts out energy-storage units, it is to avoid energy-storage units overcharges, to extend energy storage list
The service life of unit；
If energy-storage units underfill, controller opens the pwm signal of the control end A of the first gate-controlled switch Q1,
Simultaneously close off the PWM, the first gate-controlled switch Q1 of control end B of the second gate-controlled switch Q2 in an ON state, and
Second gate-controlled switch Q2 is off, and the electricity that generator unit sends is input to high voltage bus, by high voltage bus
Charge to energy-storage units；
(2)Time, energy-storage units is cut out, only generator unit powers to the load,
To reach power-balance, reduce the number of times of the discharge and recharge to energy-storage units, thus extend the use longevity of energy-storage units
Life；
Specifically, controller cuts out the pwm signal of the control end A of the first gate-controlled switch Q1, simultaneously closes off second
The PWM, the first gate-controlled switch Q1 and the second gate-controlled switch Q2 of the control end B of gate-controlled switch Q2 is in disconnecting
State, cuts out energy-storage units；
(3)PIN＜ φ2POUTTime, by energy-storage units cut, energy-storage units discharge, together with generator unit to
Load supplying, to reach power-balance；
Specifically, controller cuts out the pwm signal of the control end A of the first gate-controlled switch Q1, opens second simultaneously
The PWM of the control end B of gate-controlled switch Q2, the first gate-controlled switch Q1 is off, and the second gate-controlled switch
Q2 in an ON state, cuts energy-storage units；
Wherein, PINFor the power summation of generator unit generating, POUTFor output.φ1It is the first coefficient, φ2For
Second coefficient, can be identical, it is also possible to different.
φ1With φ2Time identical, such as φ1=1, φ2=1, now PINLess than POUTTime, energy-storage units discharges,
Power to the load together with generator unit；PINEqual to POUTTime, cut out energy-storage units；PINMore than POUTTime, as
Really energy-storage units has been filled with, and cuts out energy-storage units, it is to avoid energy-storage units overcharges, and extends making of energy-storage units
With the life-span, if energy-storage units underfill, unnecessary power is used to charge to energy-storage units.
In order to avoid PINEqual to POUTNeighbouring frequently switching, the most slightly smaller than POUT, energy-storage units discharges, slightly
More than POUTCut out again energy-storage units or charge to energy-storage units, it is possible to use different φ1With φ2, φ1More than φ2
Such as φ1=1.05, φ2=1, now PINLess than POUTTime, energy-storage units discharge, together with generator unit to
Load supplying；PINMore than POUT1.05 times time, whether be full of according to energy-storage units, operate accordingly；
And PINIt is in POUTWith POUT1.05 times between, cut out energy-storage units, namely generator unit send electricity
Power balances with bearing power.
In another embodiment, using circuit as shown in Figure 4, DC converter is BOOST booster circuit,
The positive pole of energy-storage units is connected with charge-discharge controller by the inductance L of BOOST booster circuit, then by filling
Discharge control device is connected on high voltage bus.Specifically, the first gate-controlled switch Q1 and the diode of one-way conduction
After D1 parallel connection, it is connected between inductance L and high voltage bus.
First gate-controlled switch Q1 can use IGBT, metal-oxide-semiconductor, if IGBT, metal-oxide-semiconductor itself carry unidirectional
Logical diode, now without being separately provided one-way conduction diode；But when if electric current is bigger, it is possible to individually set
Put one-way conduction diode.
In another embodiment, using circuit as shown in Figure 5, DC converter is BOOST booster circuit,
First gate-controlled switch Q1 can use bidirectional thyristor.
In the present embodiment, power supply access device includes one group of energy-storage units incoming end, in another embodiment,
As shown in Figure 6, power supply access device includes two groups of energy-storage units incoming ends, it is possible to access two groups of energy-storage units:
Battery 1 and battery 2, battery 1 and battery 2 control charge and discharge by charge-discharge controller respectively, when negative
When the power difference of the electricity that load and generator unit send is bigger, two Battery packs electric discharge outputs can be used simultaneously,
To ensure electric power system stable power-supplying；Or during a Battery pack charging, use another Battery pack electric discharge output.
Certainly power supply access device can also include one group of energy-storage units incoming end, the invention is not limited in this regard.
Use the power supply access device in the present embodiment, many group energy-storage units incoming ends can access charge-discharge characteristic
Identical or different energy-storage units, the most all accesses lead-acid battery；Lead-acid battery and lithium electricity can also be respectively connected to
Pond, wherein lithium battery is more suitable for frequent discharge and recharge, therefore in power supply process, preferentially uses lithium battery；Or
Lead-acid battery is discharged with lithium battery by person with different frequencies.
Battery management system (BMS), primarily to the utilization rate of battery can be improved, prevents battery from occurring excessively
Charging and over-discharge, extend the service life of battery, the state of monitoring battery.
In the present embodiment, the function of the controller following BMS of realization:
(1) state-of-charge (State of Charge, i.e. SOC) of energy-storage units, i.e. energy-storage units are estimated
Dump energy, it is ensured that in the range of SOC maintains reasonably, thus prevent owing to overcharge or overdischarge are to energy storage
Unit cause damage；
(2) in energy-storage units charge and discharge process, Real-time Collection terminal voltage, charging and discharging currents, prevent battery from sending out
Raw overcharge or overdischarge phenomenon.
Controller realizes BMS function, can effectively save battery 3%, thus reduce integral device
Cost.
The preferred embodiment of the present invention described in detail above.Should be appreciated that the ordinary skill people of this area
Member just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all skill
In art field technical staff the most on the basis of existing technology by logical analysis, reasoning or
The available technical scheme of limited experiment, all should be in the protection domain being defined in the patent claims.
Claims (12)
1. a power supply access device, is used for accessing generator unit and energy-storage units and powers to the load, and described confession is electrically accessed
Device includes commutator, DC converter, unloader, inverter and controller, and described commutator is used for generator unit
The rectification of input, described DC converter is for the generating after energy-storage units input, generator unit input or rectification
Unit input boosting, described unloader is used for discharging excess energy, and described inverter is used for being converted to direct current exchange,
It is characterized in that, power supply access device also includes charge-discharge controller, be used for controlling the electric discharge of described energy-storage units or
Charging, described controller controls described charge-discharge controller.
Power the most as claimed in claim 1 access device, it is characterised in that described charge-discharge controller is arranged at institute
State between energy-storage units and high voltage bus.
Power the most as claimed in claim 2 access device, it is characterised in that described DC converter is BOOST boosting
Circuit.
Power the most as claimed in claim 3 access device, it is characterised in that the positive pole of described energy-storage units passes through BOOST
The inductance of booster circuit is connected with charge-discharge controller, then is connected on high voltage bus by charge-discharge controller.
Power the most as claimed in claim 1 access device, it is characterised in that described charge-discharge controller includes parallel connection
Half-duplex channel and controlled path, wherein said controlled path disconnect time, energy-storage units is discharged by described half-duplex channel,
During the conducting of described controlled path, energy-storage units is charged by controlled path.
Power the most as claimed in claim 5 access device, it is characterised in that it is controlled that described controlled path is provided with first
Switch, described half-duplex channel is provided with the diode for one-way conduction.
Power the most as claimed in claim 1 access device, it is characterised in that described power supply access device include one group or
Many group energy-storage units incoming ends.
Power the most as claimed in claim 1 access device, it is characterised in that described power supply access device includes organizing storage more
Energy unit incoming end, for accessing the energy-storage units that charge-discharge characteristic is identical or different.
Power the most as claimed in claim 1 access device, it is characterised in that described energy-storage units incoming end accesses charge and discharge
The energy-storage units that electrical characteristics are different, described controller with different priority or different frequencies to described energy storage list
Unit's electric discharge.
Power the most as claimed in claim 1 access device, it is characterised in that described controller has battery management function.
The charge/discharge control method of 11. 1 kinds of power supply access devices as described in any one of claim 1-10, its feature exists
In, comprise the following steps:
When the power of a electricity that () generator unit sends is more than the product of bearing power and the first coefficient, if described energy storage
Unit underfill, controls to charge to described energy-storage units；If described energy-storage units has been filled with, cut out described storage
Energy unit, starts unloader；
When the power of b electricity that () described generator unit sends is less than the product of described bearing power and the second coefficient, control
Described energy-storage units discharge, described energy-storage units together with described generator unit to described load supplying；
The power of c electricity that () described generator unit sends more than or equal to described bearing power and the second coefficient product and
During less than or equal to the product of bearing power and the first coefficient, cut out described energy-storage units.
The charge/discharge control method of 12. access devices of powering as claimed in claim 11, it is characterised in that described first
Coefficient is more than or equal to described second coefficient.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610343620.4A CN106026202A (en) | 2016-05-20 | 2016-05-20 | Power supply access device and charge and discharge control method thereof |
| CA3019619A CA3019619C (en) | 2016-05-20 | 2017-05-17 | Power supply connection device, and charging-discharging control method for same |
| PCT/CN2017/084722 WO2017198172A1 (en) | 2016-05-20 | 2017-05-17 | Power supply connection device, and charging-discharging control method for same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610343620.4A CN106026202A (en) | 2016-05-20 | 2016-05-20 | Power supply access device and charge and discharge control method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN106026202A true CN106026202A (en) | 2016-10-12 |
Family
ID=57096670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610343620.4A Pending CN106026202A (en) | 2016-05-20 | 2016-05-20 | Power supply access device and charge and discharge control method thereof |
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| Country | Link |
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| CN (1) | CN106026202A (en) |
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| CN106482300A (en) * | 2016-10-31 | 2017-03-08 | 广东美的制冷设备有限公司 | Solar air conditioner control method, device and solar air conditioner |
| WO2017198172A1 (en) * | 2016-05-20 | 2017-11-23 | 上海电气分布式能源科技有限公司 | Power supply connection device, and charging-discharging control method for same |
| CN109758171A (en) * | 2019-01-17 | 2019-05-17 | 苏州博思得电气有限公司 | Power supply unit, ray image documentation equipment and power control method |
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