CN106159981B - A kind of mixed energy storage system and micro-grid system - Google Patents
A kind of mixed energy storage system and micro-grid system Download PDFInfo
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Abstract
The embodiment of the invention provides a kind of mixed energy storage system and micro-grid systems, to solve in existing mixed energy storage system, due to needing to be determined by energy management unit the charge-discharge electric power of accumulator cell charging and discharging power and super capacitor, so as to cause system realize more complex problem.First kind bidirectional power converter in the system changes charge/discharge speed when carrying out charge and discharge to first kind energy storage device according to the change rate of preset charge/discharge speed when the parameter value of the physical parameter on bus changes；Until charge/discharge speed when carrying out charge and discharge to first kind energy storage device no longer changes when the parameter value of physical parameter is equal to the first parameter value or is equal to the second parameter value；Second class bidirectional power converter when for reaching the boundary value of preset range in parameter value, carries out charge and discharge to the second class energy storage device, so that parameter value maintains the boundary value of preset range, the first parameter value and the second parameter value are respectively positioned in the preset range.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of mixed energy storage systems and micro-grid system.
Background technique
At present in island and remote districts, generally powered using micro-capacitance sensor, that is, rely primarily on photovoltaic power generation, wind-power electricity generation,
The power generation of the new energies such as tidal power generation.Because of the intermittence of these new energy, these new energy, which can not provide, to be continued reliably
Therefore, in micro-grid system power supply needs energy-storage system to maintain the stabilization of electric energy.
Currently, generally forming mixed energy storage system using battery and super capacitor, storage battery energy density is high, but frequently
Ground high current charge-discharge can shorten its service life, and super capacitor charge-discharge electric power is big, has extended cycle life, but energy density is small.It adopts
Battery can be made full use of with battery and super capacitor composition mixed energy storage system and is surpassed
Micro-grid system shown in FIG. 1 includes mixed energy storage system 11, load 12, photovoltaic generating system 13, wind-power electricity generation
System 14, wherein mixed energy storage system 11 include battery, super capacitor, energy management unit 15, with battery and direct current/
Ac bus connected bidirectional power converter 1, the bidirectional power converter 2 that is connected with super capacitor and DC/AC bus,
Wherein, energy management unit 15 obtains the power P w that wind generator system is output to DC/AC bus, photovoltaic power generation system respectively
System 13 is output to the power P v of DC/AC bus, the power P l of 12 consumption of load, so that it is determined that the charge and discharge of energy-storage system 11
Power P w+Pv-Pl (when Pw+Pv-Pl is greater than 0, determines the charge power of energy-storage system 11；When Pw+Pv-Pl is less than 0, really
Determine the discharge power of energy-storage system 11)；And determining charge-discharge electric power is subjected to low-pass filtering, obtain accumulator cell charging and discharging function
Rate, then using the difference of the charge-discharge electric power of determining charge-discharge electric power and battery as the charge-discharge electric power of super capacitor；It is double
Charge and discharge are carried out to battery according to the charge-discharge electric power of battery to power inverter 1, bidirectional power converter 2 is according to super
The charge-discharge electric power of capacitor carries out charge and discharge to super capacitor.That is, after determining charge-discharge electric power, determining charge and discharge
High frequency section in electrical power is as accumulator cell charging and discharging power, and the low frequency part in determining charge-discharge electric power is as super electricity
The charge-discharge electric power of appearance.
Energy management unit needs to acquire the electric current of each input source and load, voltage, calculates the function of each provenance and load
Rate, the power that can just obtain battery and super capacitor using filtering are given.This just needs to increase electric current, voltage sampling circuit
Or increases high speed communication line between input source, load and energy management unit and be just able to achieve, and energy management unit and two-way
The communication line of high speed is also required between power inverter 1, bidirectional power converter 2.System realizes more complex, hardware cost
Height, and communication line, vulnerable to interference, reliability is poor.Further, since needing signal wire connection between each unit circuit, put
Position is limited, is unfavorable in the application for being applied to distributed power generation occasion.
In conclusion needing to determine accumulator cell charging and discharging by energy management unit in existing mixed energy storage system
The charge-discharge electric power of power and super capacitor, this will lead to, and system realization is more complex, and for communication line vulnerable to interference, reliability is poor,
And limit network system application using mixed energy storage system.
Summary of the invention
The embodiment of the invention provides a kind of mixed energy storage system and micro-grid systems, store up to solve in existing mixing
In energy system, due to needing to be determined the charge-discharge electric power of accumulator cell charging and discharging power and super capacitor by energy management unit,
This will lead to system realize it is more complex, limit the network system application using mixed energy storage system.
Based on the above issues, a kind of mixed energy storage system provided in an embodiment of the present invention, including first kind bidirectional power become
Parallel operation, first kind energy storage device, the second class bidirectional power converter and the second class energy storage device；The first kind bidirectional power becomes
Parallel operation, for obtaining the parameter value of the physical parameter on bus, and when the parameter value changes, according to preset charge and discharge
The change rate of electric speed changes charge/discharge speed when carrying out charge and discharge to first kind energy storage device；Until the physical parameter
When parameter value is equal to the first parameter value or is equal to the second parameter value, charge and discharge when charge and discharge are carried out to first kind energy storage device
Speed no longer changes；The second class bidirectional power converter, for obtaining the parameter value of the physical parameter, and in the ginseng
Numerical value reach preset range boundary value when, to the second class energy storage device carry out charge and discharge so that the parameter value maintain it is pre-
If the boundary value of range, first parameter value and second parameter value are respectively positioned in the preset range.
A kind of micro-grid system provided in an embodiment of the present invention, including mixed energy storage system provided in an embodiment of the present invention.
The beneficial effect of the embodiment of the present invention includes:
Physics of the first kind bidirectional power converter on bus in mixed energy storage system provided in an embodiment of the present invention
First kind energy storage device is controlled when the parameter value of parameter changes to carry out the variation of the parameter value of the physical parameter on bus
Slow response, thus avoid the charging and discharging currents pace of change of first kind energy storage device too fast, the second class bidirectional power converter
The second class energy storage device is controlled when the parameter value of the parameter reaches the boundary value of preset range to the ginseng of the physical parameter
The variation of numerical value carries out quick response, so that it is guaranteed that the parameter value is without departing from preset range, due to the mixed energy storage system
In do not need energy management unit, therefore simplify the structure of system, improve the anti-interference and reliability of system, extend
Using the network system application of mixed energy storage system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of micro-grid system in the prior art；
Fig. 2 is the structural schematic diagram of mixed energy storage system provided in an embodiment of the present invention；
When Fig. 3 is that mixed energy storage system provided in an embodiment of the present invention is applied in practice, with the power of load consumption
With the variation of the power of electricity generation system output, the variation of the voltage on DC bus, the electric current of first kind bidirectional power converter
Variation and the second class bidirectional power converter electric current variation schematic diagram.
Specific embodiment
Physics of the first kind bidirectional power converter on bus in mixed energy storage system provided in an embodiment of the present invention
First kind energy storage device is controlled when the parameter value of parameter changes to carry out the variation of the parameter value of the physical parameter on bus
Slow response, the second class bidirectional power converter control second when the parameter value of the parameter reaches the boundary value of preset range
Class energy storage device carries out quick response to the variation of the parameter value of the physical parameter, so both can be to avoid first kind accumulator
The charging and discharging currents pace of change of part is too fast, but may insure the parameter value without departing from preset range, and be not necessary to
Energy management unit, to simplify the structure of system in the case where system performance is constant.
With reference to the accompanying drawings of the specification, to a kind of mixed energy storage system provided in an embodiment of the present invention and micro-grid system
Specific embodiment is illustrated.
A kind of mixed energy storage system provided in an embodiment of the present invention, as shown in Fig. 2, including first kind bidirectional power converter
21, first kind energy storage device 22, the second class bidirectional power converter 23 and the second class energy storage device 24；
First kind bidirectional power converter 21, for obtaining the parameter value of the physical parameter on bus 25, and in the ginseng
When numerical value changes, when changing according to the change rate of preset charge/discharge speed to the progress charge and discharge of first kind energy storage device 22
Charge/discharge speed；Until when the parameter value of the physical parameter is equal to the first parameter value or is equal to the second parameter value, to the
Charge/discharge speed when a kind of energy storage device 22 carries out charge and discharge no longer changes；
Second class bidirectional power converter 23 is arrived for obtaining the parameter value of the physical parameter, and in the parameter value
Up to preset range boundary value when, to the second class energy storage device 24 carry out charge and discharge so that the parameter value maintains default model
The boundary value enclosed, first parameter value and second parameter value are respectively positioned in the preset range.
When wherein, changing according to the change rate of preset charge/discharge speed to the progress charge and discharge of first kind energy storage device 22
Charge/discharge speed includes two kinds of situations, the first situation is: changing according to the change rate of preset charging rate and stores up to the first kind
Charging rate when energy device 22 is charged；Second situation is: changing according to the change rate of the preset velocity of discharge to the
Velocity of discharge when a kind of energy storage device 22 is discharged.
It further include electricity generation system 26 and load 27 in Fig. 2, wherein electricity generation system 26 can be wind power system, be also possible to too
Positive energy electricity generation system, can also be other systems that other energy can be converted to electric energy.
In energy-storage system provided in an embodiment of the present invention, exported when the first kind energy storage device on the bus
When power and electricity generation system are output to power of the sum of the power on the bus equal to the load consumption, on the bus
The parameter value of physical parameter is the second parameter value；When the power that the first kind energy storage device is absorbed from the bus with it is described
When the sum of power of load consumption is output to the power on the bus equal to electricity generation system, the parameter value of the physical parameter is
First parameter value.Wherein, the first parameter value is greater than the second parameter value, and the first parameter value and second this parameter value are in default model
In enclosing.
Wherein, the energy density of first kind energy storage device is higher than the energy density of the second class energy storage device.In practice,
The characteristics of a kind of energy storage device can be battery, such as lead-acid accumulator, lithium battery, first kind energy storage device is energy density
Height, but continually large current charge, electric discharge can shorten its service life, charging, velocity of discharge change rate can also shorten its longevity greatly very much
Life；Second class energy storage device can be super capacitor, and the characteristics of flying wheel battery etc., the second class energy storage device is that energy density is low,
Charging, discharge power is big, has extended cycle life.
First kind energy storage device in energy-storage system provided in an embodiment of the present invention can have multiple, and multiple first kind
Energy storage device can be different, for example, first kind energy storage device includes a lead-acid accumulator, a lithium battery, or packet
Two lead-acid accumulators are included, correspondingly, first kind bidirectional power converter there can also be multiple, and the two-way function of each first kind
The change rate of different charge/discharge speeds, the first parameter value, the second parameter value can be set in rate converter, to control different
Second class energy storage device charge and discharge energy.The second class energy storage device in energy-storage system provided in an embodiment of the present invention can have more
It is a, and multiple second class energy storage devices can be different, for example, the second class energy storage device includes a super capacitor, one
A flying wheel battery, or including two super capacitors, correspondingly, the second class bidirectional power converter can also have it is multiple, and
The boundary value of different preset ranges can be set in each second class bidirectional power converter, to control different the second class storages
It can device charge and discharge energy.
Mixed energy storage system shown in Fig. 2 only with a first kind bidirectional power converter, a first kind energy storage device,
It is illustrated for one the second class bidirectional power converter and a second class energy storage device.
In mixed energy storage system shown in Fig. 2, the first kind bidirectional power for connecting bus and first kind energy storage device becomes
Parallel operation, when the parameter value of the physical parameter on bus changes, according to the change rate change pair of preset charge/discharge speed
First kind energy storage device carries out charge/discharge speed when charge and discharge, so that the variation of the characteristic value of the voltage on bus is responded, and
Avoid the charging and discharging currents pace of change of first kind energy storage device too fast；And since the charging and discharging currents of first kind energy storage device become
Change speed it is slower, therefore, the parameter value of the physical parameter can change to the boundary value of preset range, at this point, connection bus and
Second class bidirectional power converter of the second class energy storage device carries out charge and discharge to the second class energy storage device, so that the physics is joined
Several parameter values maintains the boundary value of preset range；Until the parameter value of the physical parameter is equal to the first parameter value or waits
When the second parameter value, charge/discharge speed when carrying out charge and discharge to first kind energy storage device no longer changes.
Electric current (or power) change rate of first kind bidirectional power converter, that is, first kind energy storage device is filled
The change rate of charge/discharge speed when electric discharge can be set according to the capacity of first kind energy storage device, while be also required to examine
Sensitivity of the parameter value of physical parameter on worry bus to the variation of the power (power of electricity generation system output) of load consumption.
Electric current (or power) change rate of first kind bidirectional power converter is smaller, exports when the power or electricity generation system of load consumption
When changed power, the easier variation of the parameter value of the physical parameter on bus, the parameter value of the physical parameter on bus is to load
The sensitivity of the variation of the power (or power of electricity generation system output) of consumption is higher；Conversely, first kind bidirectional power converter
Electric current (or power) change rate it is big, (or electricity generation system is defeated to the power of load consumption for the parameter value of the physical parameter on bus
Power out) variation sensitivity it is lower.
When bus 25 is DC bus, the physical parameter on bus 25 can be the voltage on bus 25；When bus 25
When for ac bus, the physical parameter on bus 25 can be the virtual value of the voltage on bus 25, or on bus 25
Voltage peak value, can also be the frequency of the voltage on bus 25.
Optionally, first kind bidirectional power converter is specifically used for: obtaining the parameter value of the physical parameter on bus；Institute
The parameter value of physical parameter is stated greater than the first parameter value and when charging to first kind energy storage device, according to preset charging rate
The charging rate that charge to first kind energy storage device of change rate increase, join until the parameter value of the physical parameter is equal to first
When numerical value, charging rate when charging to first kind energy storage device no longer changes.
Optionally, the first kind bidirectional power converter is specifically used for: obtaining the parameter value of the physical parameter on bus；
The physical parameter parameter value less than the first parameter value and to first kind energy storage device charge when, according to preset charging
The change rate of speed reduces charging rate charge to first kind energy storage device, until the parameter value of the physical parameter is equal to the
When one parameter value, charging rate when charging to first kind energy storage device no longer changes.
If the charging rate of first kind energy storage device charging is reduced to zero, the parameter value of the physical parameter is also less than
First parameter value, then first kind bidirectional power converter increases according to the change rate of the preset velocity of discharge to the first kind
The velocity of discharge (at this point, the initial discharge speed of first kind energy storage device electric discharge is zero) of energy storage device electric discharge, until the object
The parameter value for managing parameter is equal to second parameter value.
Optionally, the first kind bidirectional power converter is specifically used for: obtaining the parameter value of the physical parameter on bus；
The physical parameter parameter value less than the second parameter value and to first kind energy storage device discharge when, according to preset electric discharge
The velocity of discharge that the change rate increase of speed discharges to first kind energy storage device, until the parameter value of the physical parameter is equal to institute
When stating the second parameter value, velocity of discharge when discharging first kind energy storage device no longer changes.
Optionally, the first kind bidirectional power converter is specifically used for: obtaining the parameter value of the physical parameter on bus；
When the parameter value of the physical parameter is greater than the second parameter value and discharges first kind energy storage device, according to preset electric discharge
The change rate of speed reduces the velocity of discharge discharged first kind energy storage device, until the parameter value of the physical parameter is equal to institute
When stating the second parameter value, velocity of discharge when discharging first kind energy storage device no longer changes.
If the velocity of discharge of first kind energy storage device electric discharge is reduced to zero, the parameter value of the physical parameter is also greater than
Second parameter value, then, first kind bidirectional power converter increases according to the change rate of preset charging rate to first
The charging rate (at this point, the initial charge speed of first kind energy storage device charging is zero) of class energy storage device charging, until described
The parameter value of physical parameter is equal to first parameter value.
Therefore, the first kind bidirectional power converter being connected with first kind energy storage device works in current source mode, it is defeated
The electric current (or power) of (or absorption) can slowly be adjusted according to the variation of the parameter value of the physical parameter on bus out, this
On the one hand sample can quickly change to avoid the charging and discharging currents of first kind energy storage device, meanwhile, in the power of electricity generation system output
Or the power of load consumption, when changing, the parameter value of affiliated physical parameter can change significantly, in order to by described
The variation of the parameter value of physical parameter detects the power of the power grid using mixed energy storage system provided in an embodiment of the present invention
Situation of change.
Electric discharge speed when the change rate and first kind energy storage device of charging rate when first kind energy storage device charges discharge
The change rate of degree can be equal, can also be unequal.
Optionally, the second class bidirectional power converter is specifically used for: obtaining the parameter value of the physical parameter；Institute
When stating the maximum value of parameter value arrival preset range, charge to the second class energy storage device, so that the parameter value maintains
The maximum value of preset range；When the parameter value reaches the minimum value of preset range, discharge the second class energy storage device,
So that the parameter value maintains the minimum value of preset range.
Therefore, the second class bidirectional power converter being connected with the second class energy storage device works in voltage source mode, works as institute
When stating the parameter value of physical parameter and reaching the maximum value of preset range, it can control the second class energy storage device and absorb transient power, when
When the parameter value of the physical parameter reaches the minimum value of preset range, the second class energy storage device output transient power can control,
To make the parameter value of the physical parameter within a preset range.
First kind bidirectional power converter and first kind accumulator in mixed energy storage system provided in an embodiment of the present invention
The battery energy storage unit that part is constituted, the capacitor storage unit constituted with the second class bidirectional power converter and the second class energy storage device
Between it is mutually indepedent, line is not necessarily between battery energy storage unit and capacitor storage unit, therefore, the placement position of both is very clever
It is living；Also, line, battery energy storage unit and capacitor are not necessarily between battery energy storage unit and capacitor storage unit and electricity generation system
Line is not necessarily between energy-storage units and load.First kind energy storage device in mixed energy storage system provided in an embodiment of the present invention
Quantity and the quantity of the second class energy storage device can according to need free configuration.
It is changed below with the power for connecting the load consumption of DC bus, electricity generation system is output on DC bus
For the constant application scenarios of power, the mixed energy storage system that the embodiment of the present invention will be further explained provides, in the applied field
Physical parameter on scape median generatrix is the voltage on bus.
In the application scenarios, when initial, the power that electricity generation system is exported on DC bus is greater than the function of load consumption
Rate, therefore, voltage when initial on DC bus are VBH.Part B in Fig. 3 is that the power of load consumption and electricity generation system export
The schematic diagram that changes over time of power, wherein solid line indicates that the curve that the power of load consumption changes over time, dotted line indicate
The curve that the power of electricity generation system output changes over time.Part A in Fig. 3 is the power and electricity generation system with load consumption
The variation of the power of output, the schematic diagram of the variation of the voltage on DC bus, wherein the minimum value of preset range is VCL, in advance
If the maximum value of range is VCH, the first parameter value is VBH, the second parameter value is VBL.C portion in Fig. 3 is the two-way function of the second class
For the electric current of rate converter with the schematic diagram of the voltage change on DC bus, the part D in Fig. 3 is that first kind bidirectional power becomes
The electric current of parallel operation with the voltage change on DC bus schematic diagram.
As shown in figure 3, the power of load consumption increases, the function that electricity generation system is exported to DC bus at this time at the t1 moment
Rate is less than the power of load consumption.Due to current value (the i.e. first kind energy storage device of first kind bidirectional power converter charging
Charging rate) variation is slow, therefore the voltage of DC bus can be rapidly reduced to the minimum value of preset range, i.e. VCLWhen, second
Class bidirectional power converter quick response, output electric current make the voltage stabilization of DC bus in VCL.At the t1 moment to t2 moment
Between period in, the current value of first kind bidirectional power converter charging persistently reduces that (i.e. first kind energy storage device fills
Electric speed reduces), start to discharge to first kind energy storage device after being reduced to 0, and the current value to discharge continues slowly to become larger；
At the t1 moment, the current value of the second class bidirectional power converter electric discharge is increased rapidly to certain value, so that the voltage of DC bus
Stablize in VCL, when the current value that the second class bidirectional power converter discharges within the t1 moment to the period between the t2 moment is from t1
The current value at quarter starts to be gradually reduced (i.e. the velocity of discharge of the second class energy storage device reduces).At the t2 moment, the first bidirectional power
The current value of transformation electric discharge, which increases to, is equal to load desirable value, the voltage recovery of DC bus to VBL, due to VCL<VBL<VCH, the
For the work of two class bidirectional power converters in light condition, exporting electric current is 0.
At the t3 moment, the power of load consumption is further increased, and the current value of first kind bidirectional power converter charging is (i.e.
The charging rate of first kind energy storage device) variation is slow, therefore the voltage of DC bus can be rapidly reduced to preset range most
Small value, i.e. VCLWhen, the second class bidirectional power converter quick response, output electric current makes the voltage stabilization of DC bus in VCL。
Within the t3 moment to the period between the t4 moment, the current value of first kind bidirectional power converter electric discharge persistently increases (i.e. the
The velocity of discharge of a kind of energy storage device improves)；At the t3 moment, the current value of the second class bidirectional power converter electric discharge is increased rapidly
To certain value, so that the voltage stabilization of DC bus is in VCL, the second class is two-way within the t3 moment to the period between the t4 moment
The current value of power inverter electric discharge is gradually reduced (the i.e. velocity of discharge of the second class energy storage device since the current value at t3 moment
It reduces).At the t4 moment, the current value of the first bi-directional power conversion electric discharge, which increases to, is equal to load desirable value, the electricity of DC bus
It pushes back and is raised to VBL, due to VCL<VBL<VCH, for the work of the second class bidirectional power converter in light condition, exporting electric current is 0.
At the t5 moment, the power of load consumption reduces, due to the current value (i.e. the of first kind bidirectional power converter electric discharge
The velocity of discharge of a kind of energy storage device) variation is slow, therefore the voltage of DC bus will rise rapidly most reaching for preset range
Value, i.e. VCH, at this point, the second class bidirectional power converter quick response, absorbs electric current from DC bus, makes the voltage of DC bus
Stablize in VCH.Within the t5 moment to the period between the t6 moment, the current value of first kind bidirectional power converter electric discharge continues
Reduce (i.e. the velocity of discharge of first kind energy storage device reduces)；At the t5 moment, the electric current of the second class bidirectional power converter charging
Value is increased rapidly to certain value, so that the voltage stabilization of DC bus is in VCH, within the t5 moment to the period between the t6 moment
The current value of second class bidirectional power converter charging is gradually reduced (i.e. the second class energy storage device since the current value at t5 moment
Charging rate reduce).At the t6 moment, the current value of the first bi-directional power conversion charging, which is reduced to, is equal to load desirable value, directly
The current path of bus is flowed to VBL, due to VBL>VCL, in light condition, export electric current is the work of the second class bidirectional power converter
0.At the t6 moment, reversible transducer 1, which exports electric current and is reduced to, is equal to load desirable value, and busbar voltage falls back to VBL, due to VCL<
VBL<VCH, for the work of the second class bidirectional power converter in light condition, exporting electric current is 0.
At the t7 moment, the power of load consumption is further decreased, and the power of electricity generation system output at this time is greater than load consumption
Power.Since current value (i.e. the velocity of discharge of the first kind energy storage device) variation of first kind bidirectional power converter electric discharge is slow
Slowly, thus the voltage of DC bus will rise rapidly preset range most up to value, i.e. VCH, at this point, the second class bidirectional power becomes
Parallel operation quick response absorbs electric current from DC bus, makes the voltage stabilization of DC bus in VCH.At the t7 moment between the t8 moment
Period in, the current value of first kind bidirectional power converter electric discharge persistently reduces that (i.e. the electric discharge of first kind energy storage device is fast
Degree reduces), start to charge to first kind energy storage device after being reduced to 0, and the current value to charge continues slowly to become larger；In t7
The current value at moment, the charging of the second class bidirectional power converter is increased rapidly to certain value, so that the voltage stabilization of DC bus
In VCH, the current value that the second class bidirectional power converter charges within the t7 moment to the period between the t8 moment is from the t7 moment
Current value starts to be gradually reduced (i.e. the charging rate of the second class energy storage device reduces).At the t8 moment, the first bi-directional power conversion
The current value increase of charging, which can sponge in the energy that electricity generation system exports, is not supported the energy consumed, DC bus
Current path is to VBH, due to VCL<VBH<VCH, for the work of the second class bidirectional power converter in light condition, exporting electric current is 0.
A kind of micro-grid system provided in an embodiment of the present invention, including mixed energy storage system provided in an embodiment of the present invention.
Through the above description of the embodiments, those skilled in the art can be understood that the embodiment of the present invention
The mode of necessary general hardware platform can also be added to realize by software by hardware realization.Based on such reason
Solution, the technical solution of the embodiment of the present invention can be embodied in the form of software products, which can store one
In a non-volatile memory medium (can be CD-ROM, USB flash disk, mobile hard disk etc.), including some instructions are used so that a meter
It calculates machine equipment (can be personal computer, server or the network equipment etc.) and executes side described in each embodiment of the present invention
Method.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, module or stream in attached drawing
Journey is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in embodiment can describe be divided according to embodiment
It is distributed in the device of embodiment, corresponding change can also be carried out and be located in one or more devices different from the present embodiment.On
The module for stating embodiment can be merged into a module, can also be further split into multiple submodule.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (11)
1. a kind of mixed energy storage system, which is characterized in that including first kind bidirectional power converter, first kind energy storage device,
Two class bidirectional power converters and the second class energy storage device；
The first kind bidirectional power converter, for obtaining the parameter value of the physical parameter on bus, and in the parameter value
When changing, change charge and discharge when carrying out charge and discharge to first kind energy storage device according to the change rate of preset charge/discharge speed
Electric speed；Until being stored up when the parameter value of the physical parameter is equal to the first parameter value or is equal to the second parameter value to the first kind
Charge/discharge speed when energy device carries out charge and discharge no longer changes；
The second class bidirectional power converter is reached for obtaining the parameter value of the physical parameter, and in the parameter value
When the boundary value of preset range, charge and discharge are carried out to the second class energy storage device, so that the parameter value maintains preset range
Boundary value, first parameter value and second parameter value are respectively positioned in the preset range.
2. the system as claimed in claim 1, which is characterized in that the first kind bidirectional power converter is specifically used for:
Obtain the parameter value of the physical parameter on bus；
When the parameter value of the physical parameter is greater than the first parameter value and charges to first kind energy storage device, according to preset
The charging rate that the change rate increase of charging rate charges to first kind energy storage device, until the parameter value etc. of the physical parameter
When the first parameter value, charging rate when charging to first kind energy storage device no longer changes.
3. the system as claimed in claim 1, which is characterized in that the first kind bidirectional power converter is specifically used for:
Obtain the parameter value of the physical parameter on bus；
The physical parameter parameter value less than the first parameter value and to first kind energy storage device charge when, according to preset
The change rate of charging rate reduces the charging rate to charge to first kind energy storage device, until the parameter value etc. of the physical parameter
When the first parameter value, charging rate when charging to first kind energy storage device no longer changes.
4. system as claimed in claim 3, which is characterized in that the first kind bidirectional power converter is also used to:
If the charging rate of first kind energy storage device charging is when being reduced to zero, the parameter value of the physical parameter is also less than described the
One parameter value, then the velocity of discharge discharged according to the change rate increase of the preset velocity of discharge first kind energy storage device, until
The parameter value of the physical parameter is equal to second parameter value.
5. the system as claimed in claim 1, which is characterized in that the first kind bidirectional power converter is specifically used for:
Obtain the parameter value of the physical parameter on bus；
When the parameter value of the physical parameter is less than second parameter value and discharges first kind energy storage device, according to pre-
If the velocity of discharge velocity of discharge discharge first kind energy storage device of change rate increase, up to the parameter of the physical parameter
When value is equal to second parameter value, velocity of discharge when discharging first kind energy storage device no longer changes.
6. the system as claimed in claim 1, which is characterized in that the first kind bidirectional power converter is specifically used for:
Obtain the parameter value of the physical parameter on bus；
When the parameter value of the physical parameter is greater than the second parameter value and discharges first kind energy storage device, according to preset
The change rate of the velocity of discharge reduces the velocity of discharge discharged first kind energy storage device, until the parameter value etc. of the physical parameter
When second parameter value, velocity of discharge when discharging first kind energy storage device no longer changes.
7. system as claimed in claim 6, which is characterized in that the first kind bidirectional power converter is also used to:
If the velocity of discharge of first kind energy storage device electric discharge is when being reduced to zero, the parameter value of the physical parameter is also greater than described the
Two parameter values, then the charging rate to charge according to the change rate increase of preset charging rate to first kind energy storage device, until
The parameter value of the physical parameter is equal to first parameter value.
8. the system as claimed in claim 1, which is characterized in that the second class bidirectional power converter is specifically used for:
Obtain the parameter value of the physical parameter；
When the parameter value reaches the maximum value of preset range, charge to the second class energy storage device, so that the parameter
Value maintains the maximum value of preset range；
When the parameter value reaches the minimum value of preset range, discharge the second class energy storage device, so that the parameter
Value maintains the minimum value of preset range.
9. the system as claimed in claim 1, which is characterized in that the bus is DC bus, the physics ginseng on the bus
Number is the voltage on the bus.
10. the system as claimed in claim 1, which is characterized in that the bus is ac bus, the physics ginseng on the bus
Number is the virtual value of the voltage on the bus, perhaps for the peak value of the voltage on the bus or on the bus
The frequency of voltage.
11. a kind of micro-grid system, which is characterized in that including such as described in any item mixed energy storage systems of claim 1-10.
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| CN113437753B (en) * | 2021-08-25 | 2021-11-19 | 广州乐盈信息科技股份有限公司 | Energy storage system |
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| CN102377192A (en) * | 2011-10-31 | 2012-03-14 | 清华大学 | Direct-driving wave power-generating and energy-storing device and control method |
| CN202817783U (en) * | 2012-09-27 | 2013-03-20 | 广东易事特电源股份有限公司 | Super capacitor and storage battery combined energy storage energy management circuit for photovoltaic grid-connected power generation |
| CN103701144A (en) * | 2013-12-11 | 2014-04-02 | 清华大学 | Power distribution method for hybrid energy storage system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377192A (en) * | 2011-10-31 | 2012-03-14 | 清华大学 | Direct-driving wave power-generating and energy-storing device and control method |
| CN202817783U (en) * | 2012-09-27 | 2013-03-20 | 广东易事特电源股份有限公司 | Super capacitor and storage battery combined energy storage energy management circuit for photovoltaic grid-connected power generation |
| CN103701144A (en) * | 2013-12-11 | 2014-04-02 | 清华大学 | Power distribution method for hybrid energy storage system |
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