CN109560539A - A kind of method, circuit and the device of photovoltaic direct-furnish DC power system power distribution - Google Patents
A kind of method, circuit and the device of photovoltaic direct-furnish DC power system power distribution Download PDFInfo
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- CN109560539A CN109560539A CN201811259867.3A CN201811259867A CN109560539A CN 109560539 A CN109560539 A CN 109560539A CN 201811259867 A CN201811259867 A CN 201811259867A CN 109560539 A CN109560539 A CN 109560539A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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Abstract
The invention discloses a kind of methods of photovoltaic direct-furnish DC power system power distribution, comprising the following steps: S100) obtain photovoltaic DC direct-furnish unit output voltage Up and DC power supplier output voltage Ug on DC bus；S200) adjustment output voltage makes Δ U=Up- (Ug+Ustep) to be 0, and wherein Ustep is voltage steps；S300 actual loading power P r, photovoltaic DC direct-furnish unit output power Pp and DC power supplier output power Pg) are obtained；S400 the value of actual loading power P r and photovoltaic DC direct-furnish unit output power Pp) are compared, and when illumination abundance, photovoltaic power generation input energy is sufficient, photovoltaic DC direct-furnish unit provides whole energy of DC power system load, when illumination deficiency；Photovoltaic power generation input energy is insufficient, and photovoltaic DC direct-furnish unit can not provide whole energy of DC power system load, the power output of balance adjustment photovoltaic DC direct-furnish unit and DC power source unit.
Description
Technical field
The present invention relates to photovoltaic power generation and mains hybrid technical field circuit protection technical field, in particular to a kind of photovoltaic
Method, circuit and the device of direct-furnish DC power system power distribution.
Background technique
Main replacer of the new energy photovoltaic power generation as the following traditional energy, increasingly receives significant attention and height weight
Depending on.The principal element for influencing photovoltaic efficiency is the light conditions of the sun, and photovoltaic power generation output power is with solar irradiation, environment
The external conditions such as temperature and moment change.In order to improve new energy photovoltaic power generation utilization rate, photovoltaic generating system output work is realized
Rate is maximum, according to the characteristic of photovoltaic module, needs to track the maximum power point of photovoltaic generating system.Realize maximum power
Point tracking (Maximum Power Point Tracking, MPPT) method is more, mainly there is constant voltage process, disturbance observation
Method, conductance increment method etc., usually adjustment output power whether to calculate in maximum power point, be current major measure it
One.
While carrying out the control of photovoltaic power generation energy compatibility, not only need to consider power distribution between photovoltaic and power grid
Problem, the control of MPPT needed for also taking into account photovoltaic power generation, the two coordinating and unifying can just be such that photovoltaic generating system efficiency plays
To maximum.
Summary of the invention
In order to realize the coordination and control of power distribution between photovoltaic power generation and power grid, obtain photovoltaic power generation most preferably
Operational efficiency, the present invention propose method, circuit and the device of a kind of photovoltaic direct-furnish DC power system power distribution.
Firstly, a kind of method that the application proposes photovoltaic direct-furnish DC power system power distribution, comprising the following steps:
S100 photovoltaic DC direct-furnish unit output voltage Up and DC power supplier output voltage on DC bus) are obtained
Ug；
S200) adjustment output voltage makes Δ U=Up- (Ug+Ustep) to be 0, and wherein Ustep is voltage steps；
S300 actual loading power P r, photovoltaic DC direct-furnish unit output power Pp and DC power supplier output) are obtained
Power P g；
S400 the value of actual loading power P r and photovoltaic DC direct-furnish unit output power Pp) are compared, and
As Pp > Pr, enableWherein, PpiFor single photovoltaic separate unit direct current direct supply module output power, n is
Positive integer greater than 1 indicates the quantity of photovoltaic separate unit direct current direct supply module；
As 0 < Pp < Pr, photovoltaic DC direct supply module export ratio COEFFICIENT K p, DC power supplier export ratio are adjusted
COEFFICIENT K g and separate unit DC power supplier output power PgjValue so that gross output be equal to actual loading power P r, that is,
MakeWherein, n and m is greater than 1 positive integer, respectively indicates photovoltaic separate unit direct current direct-furnish
The quantity of module and the quantity of DC power supplier, PpiFor separate unit photovoltaic separate unit direct current direct supply module output power；
As Pp=0, enable
Further, in the application above method, step S400 further includes following previous step:
S401) the stream output inside DC power supply mould and photovoltaic DC direct-furnish unit execute respectively.
Further, in the application above method, step S400 further includes following postposition step:
S402) equal power output is executed in photovoltaic DC direct-furnish unit and DC power supplier respectively；
S403) MPPT maximum power point tracking is executed on photovoltaic DC direct-furnish unit；
S404 pulse-width regulated control) is executed to output electric current.
Further, in the application above method, the Ustep is constant, and value is 1V.
Secondly, the application proposes a kind of circuit of photovoltaic direct-furnish DC power system power distribution, comprising: power distribution control
Device processed, flow equalizing circuit, stream bus, equal power circuit and MPPT maximum power point tracking adjust circuit；
Further, in the application foregoing circuit, the stream bus connects the flow equalizing circuit, the equal galvanic electricity stream
The equal power circuit is connected, the equal power circuit connects the MPPT maximum power point tracking and adjusts pulsewidth tune described in circuit connection
Save control circuit and the power distribution controller.
Further, in a kind of above-mentioned circuit of photovoltaic direct-furnish DC power system power distribution of the application, Yi Zhongguang
Lie prostrate direct-furnish DC power system power distribution circuit, the flow equalizing circuit include: flow bus circuit, current collection circuit and
Differential amplifier circuit；
Wherein, the stream bus circuit includes the first operational amplifier, first resistor, second resistance, 3rd resistor, and the
Four resistance and the 5th resistance；The first resistor connects the negative input end of first operational amplifier, and the second resistance connects
Connect the positive input terminal of first operational amplifier, the 3rd resistor connect the negative input end of first operational amplifier with
Between output end, the 4th resistance connects the output end of first operational amplifier, and described 5th resistance one end connects institute
State the positive input terminal of the first operational amplifier, other end ground connection；
Wherein, the current collection circuit includes second operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance, and
Nine resistance and the tenth resistance；6th resistance connects the negative input end of the second operational amplifier, and the 7th resistance connects
Connect the positive input terminal of the second operational amplifier, the 8th resistance connect the negative input end of the second operational amplifier with
Between output end, the 9th resistance connects the output end of the second operational amplifier, and described tenth resistance one end connects institute
State the positive input terminal of second operational amplifier, other end ground connection；
Wherein, the differential amplification electric current includes third operational amplifier, eleventh resistor and first capacitor, the third
The negative input end of operational amplifier connects one end of the 4th resistance, and positive input terminal connects the 9th resistance, and described the
One capacitor and the eleventh resistor are connected in series, and connect the third operational amplifier negative input end and output end it
Between.
Further, in a kind of above-mentioned circuit of photovoltaic direct-furnish DC power system power distribution of the application, it is described
Power circuit includes four-operational amplifier, the first triode and twelfth resistor；
Wherein, the positive input terminal of the four-operational amplifier connects the output end of the third operational amplifier, bears
Input terminal connects one end of the twelfth resistor, and output end connects the base stage of first triode；One or three pole
The emitter of pipe connects one end of the twelfth resistor, and collector connects the MPPT maximum power point tracking and adjusts the defeated of circuit
Enter end；The other end of the twelfth resistor is grounded.
Again, the application proposes a kind of device of photovoltaic direct-furnish DC power system power distribution, comprises the following modules:
First obtains module, for obtaining photovoltaic DC direct-furnish unit output voltage Up and DC power supply mould on DC bus
Block output voltage Ug；
Voltage control module makes Δ U=Up- (Ug+Ustep) to be 0 for adjusting output voltage, and wherein Ustep is voltage
Step；
Second obtains module, for obtaining actual loading power P r, photovoltaic DC direct-furnish unit output power Pp and direct current
Power module output power Pg；
Power distribution control module, for comparing actual loading power P r's and photovoltaic DC direct-furnish unit output power Pp
Value, and
As Pp > Pr, enableWherein, PpiFor single photovoltaic separate unit direct current direct supply module output power, n is
Positive integer greater than 1 indicates the quantity of photovoltaic separate unit direct current direct supply module；
As 0 < Pp < Pr, photovoltaic DC direct supply module export ratio COEFFICIENT K p, DC power supplier export ratio are adjusted
COEFFICIENT K g and separate unit DC power supplier output power PgjValue so that gross output be equal to actual loading power P r, that is,
MakeWherein, n and m is greater than 1 positive integer, respectively indicates photovoltaic separate unit direct current direct-furnish
The quantity of module and the quantity of DC power supplier, PpiFor separate unit photovoltaic separate unit direct current direct supply module output power；
As Pp=0, enable
Finally, the application proposes a kind of computer readable storage medium, it is stored thereon with computer instruction, it is characterised in that
Above-mentioned method and step is realized in the instruction when being executed by processor.
Beneficial achievement of the invention is, by the above method, circuit and device can realize function between photovoltaic power generation and power grid
The coordination and control of rate distribution, allow photovoltaic power generation to obtain maximum efficiency.
Detailed description of the invention
Fig. 1 show a kind of being applied to for the method for photovoltaic direct-furnish DC power system power distribution that the application is proposed
NETWORK STRUCTURE PRESERVING POWER SYSTEM schematic diagram；
Fig. 2 show a kind of the first reality of the method for photovoltaic direct-furnish DC power system power distribution that the application is proposed
Apply a flow chart；
Fig. 3 show a kind of the second reality of the method for photovoltaic direct-furnish DC power system power distribution that the application is proposed
Apply a flow chart；
Fig. 4 show a kind of equal power of the method for photovoltaic direct-furnish DC power system power distribution that the application is proposed
Functional block diagram；
Fig. 5 show a kind of flow equalizing circuit of the circuit for photovoltaic direct-furnish DC power system power distribution that application is proposed
Figure；
Fig. 6 show a kind of equal power electricity of the circuit for photovoltaic direct-furnish DC power system power distribution that application is proposed
Lu Tu；
Fig. 7 show a kind of flow equalizing circuit of the circuit for photovoltaic direct-furnish DC power system power distribution that application is proposed
The connection schematic diagram of figure and equal power circuit；
Fig. 8 show a kind of frame diagram of the device for photovoltaic direct-furnish DC power system power distribution that application is proposed.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to design of the invention, specific structure and generation clear
Chu, complete description, to be completely understood by the purpose of the present invention, scheme and effect.It should be noted that the case where not conflicting
Under, the features in the embodiments and the embodiments of the present application can be combined with each other.The identical attached drawing mark used everywhere in attached drawing
Note indicates the same or similar part.
It show a kind of answering for the method for photovoltaic direct-furnish DC power system power distribution that the application is proposed referring to Fig.1
For NETWORK STRUCTURE PRESERVING POWER SYSTEM schematic diagram.The present embodiment by routinely configure photovoltaic DC direct-furnish access DC power system for,
System is made of battery group, DC power supplier, photovoltaic DC direct-furnish unit, and totally 1 group of battery group, include 104 section 2V/
300Ah plumbic acid valve-control storage battery, float charge voltage Uf be 2.25V × 104 sections=234V, even charging voltage Uj be the section of 2.35V × 104=
244.4V, blanking voltage Us are 1.80V × 104 sections=187.2V.Battery group is chronically at floating charge state, accumulator battery voltage
For Ub, output power Pb, system power combines offer by DC power supplier and photovoltaic DC direct-furnish unit.
DC power supplier output voltage is Ug, output power Pg, includes 3 DC power suppliers (Mg1~Mg3),
The rated power of every DC power supplier is 3kW.
Wherein: PgiFor separate unit DC power supplier output power
Photovoltaic DC direct-furnish unit output voltage is Up, output power Pp, includes 2 photovoltaic DC direct supply module (Mp1
~Mp2), the rated power of every direct current direct supply module is 3kW.
Wherein: PpiFor separate unit direct current direct supply module output power
DC load power be Pr, usually about 3kW~5kW, it is related with applying working condition.
Wherein: Pp is direct current direct supply module output power, and Pg is DC power supplier output power, and Pb is battery output
Power
1, the power distribution between photovoltaic DC direct-furnish unit Mp and DC power supplier Mg.
Power distribution between photovoltaic DC direct-furnish unit Mp and DC power supplier Mg, it is complete in battery charging process
At whole output powers being undertaken in battery discharge process for battery, without power distribution.
Power distributing unit real-time monitoring DC bus-bar voltage, and adjust and control photovoltaic DC direct-furnish unit output voltage
Up and DC power supplier output voltage Ug.It is controlled using voltage steps and deviation, on blanking voltage Us, DC power supply mould
Block output voltage Ug tracks photovoltaic DC direct-furnish unit output voltage Up with voltage steps Ustep, and voltage deviation is Δ U, adjustment
Output voltage makes Δ U zero, and then realizes that the output voltage of photovoltaic DC direct-furnish unit Mp and DC power supplier Mg implements ladder
Grade coordinated control, realizes the stand-by heat zero propagation seamless switching between photovoltaic DC direct-furnish unit Mp and DC power supplier Mg.
Wherein, Δ U=Up- (Ug+Ustep), (Uj > Ug > Us, Uj > Up > Us)；
Wherein: adjustment output voltage makes voltage deviation Δ U level off to 0, Ustep-voltage steps as constant 1V.
2, power distribution of each module Mp1~Mpn when realizing MPPT inside photovoltaic DC direct-furnish unit Mp.
When illumination abundance, photovoltaic power generation input energy is sufficient, and photovoltaic DC direct-furnish unit Mp can provide DC power supply system
Whole energy of system load, DC power supplier Mg are in hot stand-by duty, noenergy output.Because actual loading power is lower than light
Generated output, MPPT control pause are lied prostrate, the unit of photovoltaic DC direct-furnish at this time is adjusted in direct current direct-furnish unit by " stream bus "
Portion's " flow equalizing circuit " controls voltage loop, the load current of equal subsystem.
Wherein: PpiFor separate unit direct current direct supply module output power
When illumination deficiency, photovoltaic power generation input energy is insufficient, and photovoltaic DC direct-furnish unit Mp can not provide DC power supply
Whole energy of system load need to supplement portion of energy by DC power supplier Mg.Because actual loading power is sent out higher than photovoltaic
Electrical power, photovoltaic power generation need full power to export, and the starting of MPPT control at this time, photovoltaic DC direct-furnish unit is believed by " flow equalizing circuit "
Number it is sent to " equal power circuit ", using " MPPT adjusts circuit ", is controlled in conjunction with MPPT, photovoltaic hair is realized in adjustment PWM output
The adjustment of electrical input voltage, and ensure that output power is divided equally.
Specifically, " flow equalizing circuit " is the circuit for realizing the internal final goal electric current and actual current for flowing and measuring,
The closed-loop control of output electric current convenient to carry out.
Specifically, the core that MPPT is adjusted is the output power point for adjusting photovoltaic module, and circuit is by adjusting Mp output
The size of power carrys out the equivalent Mp that adjusts for the demand of input power, is also equivalent to adjust the output power of photovoltaic module, from
And realize the adjusting of MPPT.
Wherein: PpiFor separate unit photovoltaic DC direct supply module output power, Kp is photovoltaic DC direct supply module export ratio system
Number, PgjFor separate unit DC power supplier output power, Kg is DC power supplier export ratio coefficient
As shown in Figure 1, power distributing unit tracks photovoltaic input power situation, coordinates and control Kp and Kg, keep photovoltaic straight
Direct-furnish unit Mp and DC power supplier Mg is flowed to keep balancing.
Referring to a kind of first embodiment process of the method for photovoltaic direct-furnish DC power system power distribution shown in Fig. 2
Figure, a kind of method that the present invention proposes photovoltaic direct-furnish DC power system power distribution, comprising the following steps:
S100 photovoltaic DC direct-furnish unit output voltage Up and DC power supplier output voltage on DC bus) are obtained
Ug；
S200) adjustment output voltage makes Δ U=Up- (Ug+Ustep) to be 0, and wherein Ustep is voltage steps；
S300 actual loading power P r, photovoltaic DC direct-furnish unit output power Pp and DC power supplier output) are obtained
Power P g；
S400 the value of actual loading power P r and photovoltaic DC direct-furnish unit output power Pp) are compared, and
As Pp > Pr, enableWherein, PpiFor single photovoltaic separate unit direct current direct supply module output power, n is
Positive integer greater than 1 indicates the quantity of photovoltaic separate unit direct current direct supply module；The power of DC load is less than the function of photovoltaic power generation
Rate is adjusted there is no need to carry out MPPT at this time, and actually photovoltaic module does not operate in optimum state at this time.
As 0 < Pp < Pr, photovoltaic DC direct supply module export ratio COEFFICIENT K p, DC power supplier export ratio are adjusted
COEFFICIENT K g and separate unit DC power supplier output power PgjValue so that gross output be equal to actual loading power P r, that is,
MakeWherein, n and m is greater than 1 positive integer, respectively indicates photovoltaic separate unit direct current direct-furnish
The quantity of module and the quantity of DC power supplier, PpiFor separate unit photovoltaic separate unit direct current direct supply module output power；
As Pp=0, enable
Specifically, as Pp > Pr, when showing illumination abundance at this time, photovoltaic power generation input energy is sufficient, and photovoltaic DC is straight
It can provide whole energy of DC power system load for unit Mp, i.e.,
Preferably, step S400 further includes following previous step:
S401) the stream output inside DC power supply mould and photovoltaic DC direct-furnish unit execute respectively, i.e., every photovoltaic is straight
The output power for flowing direct-furnish unit is equal, i.e., as Pp > Pr, Pr=nPpi, n is the quantity of photovoltaic DC direct-furnish unit.
Specifically, as 0 < Pp < Pr, show the deficiency of illumination at this time, photovoltaic power generation input energy is insufficient, photovoltaic DC
Direct-furnish unit Mp can not provide whole energy of DC power system load, need to supplement part energy by DC power supplier Mg
Amount.Because actual loading power is higher than photovoltaic generation power, photovoltaic power generation needs full power to export, the starting of MPPT control at this time, photovoltaic
Direct current direct-furnish unit is sent to " equal power circuit " by " flow equalizing circuit " signal, using " MPPT adjust circuit ", in conjunction with
MPPT control, adjustment PWM output, realizes the adjustment of photovoltaic power generation input terminal voltage, and ensure that output power is divided equally.At this point, power
Distribute control module adjustment photovoltaic DC direct supply module export ratio COEFFICIENT K p, DC power supplier export ratio COEFFICIENT K g and
Separate unit DC power supplier output power PgjValue so that gross output be equal to actual loading power P r, that is, makeWherein, n and m is greater than 1 positive integer, respectively indicates photovoltaic separate unit direct current direct-furnish
The quantity of module and the quantity of DC power supplier, PpiFor separate unit photovoltaic separate unit direct current direct supply module output power.
As Pp=0, the case where corresponding no light, photovoltaic power generation noenergy, photovoltaic DC direct-furnish unit Mp can not be provided
Energy provides whole energy by DC power supplier Mg.
Wherein: PgjFor separate unit DC power supplier output power.
Specifically, known by the output characteristics of photovoltaic cell, under different external condition, photovoltaic cell may operate at difference
And on unique maximum power point (Maximum Power Point, MPP).For photovoltaic generating system, it is intended that photovoltaic electric
Pond works on maximum power point, to convert light energy into electric energy to greatest extent.Photovoltaic cell is realized using control method
The technology of maximum power operation is referred to as maximum power point tracking technology.Different according to judgment method and criterion can will be traditional
MPPT method is divided into open loop and closed loop MPPT method.
The basic law of output characteristic curve of the open loop MPPT method based on photovoltaic cell, by simple opened loop control come
It realizes MPPT, mainly there is constant voltage tracing, short circuit current proportionality coefficient method and interpolation calculation method.Open loop class method it is simple and
Be easily achieved, can quickly by stabilization of operating point in approximate maximum power point near zone, but to realize it is further accurately with
Track then needs to introduce closed-loop control.
Closed loop MPPT method is to be realized by the real-time measurement to photovoltaic cell output voltage and electric current with closed-loop control
MPPT, to be most widely used from optimizing class algorithm.Typically there are disturbance observation method and conductance increment method from optimizing class algorithm.
Specifically, PWM is to be controlled using the numeral output of microprocessor analog circuit.To realize that digital signal turns
The conversion of analog signal, closed-loop control convenient to carry out.
Second referring to a kind of method of photovoltaic direct-furnish DC power system power distribution shown in Fig. 3 applies a flow chart,
Step S400 further includes following postposition step:
S402) equal power output is executed in photovoltaic DC direct-furnish unit and DC power supplier respectively；
S403) MPPT maximum power point tracking is executed on photovoltaic DC direct-furnish unit；
S404 pulse-width regulated control) is executed to output electric current.
Specifically, the methods of described MPPT maximum power point tracking, including constant voltage process, perturbation observation method, conductance increment method,
Usually whether adjustment output power is to calculate in maximum power point.
Referring to a kind of equal power principle block diagram of the method for photovoltaic direct-furnish DC power system power distribution of Fig. 4, mainly
Including power distribution controller, flow equalizing circuit, stream bus, equal power circuit and MPPT maximum power point tracking adjust circuit；
The stream bus connects the flow equalizing circuit, and the equal galvanic electricity stream connects the equal power circuit, the equal function
MPPT maximum power point tracking described in rate circuit connection adjusts pulse-width regulated control circuit and the power distribution control described in circuit connection
Device processed.
It is described to flow referring to a kind of flow equalizing circuit figure of the circuit of photovoltaic direct-furnish DC power system power distribution of Fig. 5
Circuit includes: to flow bus circuit, current collection circuit and differential amplifier circuit；
Wherein, the stream bus circuit includes the first operational amplifier A1, first resistor R1, second resistance R2, third
Resistance R3, the 4th resistance R4 and the 5th resistance R5；The first resistor connects the negative input end of first operational amplifier, institute
The positive input terminal that second resistance connects first operational amplifier is stated, the 3rd resistor connects first operational amplifier
Negative input end and output end between, the 4th resistance connects the output end of first operational amplifier, the 5th electricity
Resistance one end connects the positive input terminal of first operational amplifier, other end ground connection；
Wherein, the current collection circuit includes second operational amplifier A2, the 6th resistance R6, the 7th resistance R7, the 8th
Resistance R8, the 9th resistance R9 and the tenth resistance R10；6th resistance connects the negative input end of the second operational amplifier,
7th resistance connects the positive input terminal of the second operational amplifier, and the 8th resistance connects second operation amplifier
Between the negative input end and output end of device, the 9th resistance connects the output end of the second operational amplifier, and the described tenth
Resistance one end connects the positive input terminal of the second operational amplifier, other end ground connection；
Wherein, the differential amplification electric current includes third operational amplifier A3, eleventh resistor R11 and first capacitor C1,
The negative input end of the third operational amplifier connects one end of the 4th resistance, positive input terminal connection the 9th electricity
Resistance, the first capacitor and the eleventh resistor are connected in series, and connect the third operational amplifier negative input end and
Between output end.
A kind of equal power circuit figure of the circuit of photovoltaic direct-furnish DC power system power distribution referring to shown in Fig. 6, it is described
Equal power circuit includes four-operational amplifier A4, the first triode Q1 and twelfth resistor R12；
Wherein, the positive input terminal of the four-operational amplifier connects the output end of the third operational amplifier, bears
Input terminal connects one end of the twelfth resistor, and output end connects the base stage of first triode；One or three pole
The emitter of pipe connects one end of the twelfth resistor, and collector connects the MPPT maximum power point tracking and adjusts the defeated of circuit
Enter end；The other end of the twelfth resistor is grounded.
Specifically, first triode is NPN type triode, and base stage (B) connects the third operational amplifier
Output end, emitter (E) connect one end of the twelfth resistor, and collector (C) connects the MPPT maximum power point tracking tune
The input terminal on economize on electricity road, according to the electric current relations of distribution of NPN type triode, the electric current for flowing through emitter, which is equal to, flows through collector
Electric current and flow through the sum of electric current of base stage, i.e. IE=IC+IB, IC=β IB, wherein β is the amplification coefficient of triode.
Referring to a kind of stream of the circuit of the photovoltaic direct-furnish DC power system power distribution shown in Fig. 7 for applying being proposed
The connection schematic diagram of circuit diagram and equal power circuit, as shown in the figure, current signal pass through flow equalizing circuit, equal power circuit respectively
Afterwards, it is output to MPPT and adjusts circuit, exported after PWM controller.Specifically, according to the input of a typical differential amplifier circuit
Formula is exported, the output voltage of output end is according to related to the voltage difference of two input terminal:
Vo3=Rx1Vo2-Rx2Vo1, wherein Rx1, Rx2To load the equivalent resistance in two input terminals.
As it can be seen that V03Voltage with flow bus input terminal V01It is inversely proportional, the collection voltages V with circuit02It is directly proportional, because
This works as V01Greater than V02When, V03Become smaller, then the electric current for flowing through the first triode Q1 base stage becomes smaller, then flows through the electric current of emitter i.e.
I in Fig. 701Become smaller, voltage V04Become smaller, adjusting inside circuit in MPPT has logic and algorithm control, to realize I01When becoming smaller,
The duty ratio of output is improved, realizes output electric current IoutIncrease, stream bus is equivalent to reference current at this time, realizes when circuit is adopted
When collecting voltage is less than stream bus voltage, it can make to export electric current I by adjustingoutIncrease, to reach the effect of power control
Fruit.
On the contrary, working as V01Less than V02When, V03Become larger, then the electric current for flowing through the first triode Q1 base stage becomes larger, then flows through hair
I in electric current, that is, Fig. 7 of emitter-base bandgap grading01Become larger, voltage V04Become larger, adjusting inside circuit in MPPT has logic and algorithm control, realizes
Work as I01Become larger and exports electric current IoutIncrease small.Stream bus is equivalent to reference current at this time, realizes and flows when circuit collection voltages are greater than
When bus voltage, it can make to export electric current I by adjustingoutReduce, to achieve the effect that power control.Referring to shown in Fig. 8
A kind of photovoltaic direct-furnish DC power system power distribution device frame diagram, comprise the following modules:
First obtains module, for obtaining photovoltaic DC direct-furnish unit output voltage Up and DC power supply mould on DC bus
Block output voltage Ug；
Voltage control module makes Δ U=Up- (Ug+Ustep) to be 0 for adjusting output voltage, and wherein Ustep is voltage
Step；
Second obtains module, for obtaining actual loading power P r, photovoltaic DC direct-furnish unit output power Pp and direct current
Power module output power Pg；
Power distribution control module, for comparing actual loading power P r's and photovoltaic DC direct-furnish unit output power Pp
Value, and
As Pp > Pr, enableWherein, PpiFor single photovoltaic separate unit direct current direct supply module output power, n is
Positive integer greater than 1 indicates the quantity of photovoltaic separate unit direct current direct supply module；
As 0 < Pp < Pr, photovoltaic DC direct supply module export ratio COEFFICIENT K p, DC power supplier export ratio are adjusted
COEFFICIENT K g and separate unit DC power supplier output power PgjValue so that gross output be equal to actual loading power P r, that is,
MakeWherein, n and m is greater than 1 positive integer, respectively indicates photovoltaic separate unit direct current direct-furnish
The quantity of module and the quantity of DC power supplier, PpiFor separate unit photovoltaic separate unit direct current direct supply module output power；
As Pp=0, enable
Finally, being stored thereon with computer instruction the present invention also provides a kind of computer readable storage medium.The instruction
It is realized when being executed by processor such as the step of any one of aforementioned method.
It should be appreciated that the embodiment of the present invention can be by computer hardware, the combination of hardware and software or by depositing
The computer instruction in non-transitory computer-readable memory is stored up to be effected or carried out.Standard volume can be used in the method
Journey technology-includes that the non-transitory computer-readable storage media configured with computer program is realized in computer program,
In configured in this way storage medium make computer operated in a manner of specific and is predefined-according to describing in a particular embodiment
Method and attached drawing.Each program can be realized with the programming language of level process or object-oriented with logical with computer system
Letter.However, if desired, the program can be realized with compilation or machine language.Under any circumstance, the language can be compiling or
The language of explanation.In addition, the program can be run on the specific integrated circuit of programming for this purpose.
Further, this method can be realized in being operably coupled to suitable any kind of computing platform, including
But it is not limited to PC, mini-computer, main frame, work station, network or distributed computing environment, individual or integrated
It computer platform or is communicated with charged particle tool or other imaging devices etc..Each aspect of the present invention can be with storage
No matter machine readable code on non-transitory storage medium or equipment is moveable or is integrated to calculate and put down to realize
Platform, such as hard disk, optically read and/or write-in storage medium, RAM, ROM, so that it can be read by programmable calculator, when depositing
Storage media or equipment can be used for configuration and operation computer to execute process described herein when being read by computer.In addition,
Machine readable code, or part thereof can be transmitted by wired or wireless network.When such media include in conjunction with microprocessor or
When other data processors realize the instruction or program of steps described above, invention as described herein includes that these and other are different
The non-transitory computer-readable storage media of type.When methods and techniques according to the present invention programming, the present invention is also
Including computer itself.
This document describes embodiment of the disclosure, become known for executing optimal mode of the invention including inventor.It is readding
After having read foregoing description, the variation of these embodiments will be apparent those skilled in the art.Inventor wishes skill
Art personnel optionally use such modification, and inventor be intended to by be different from it is as specifically described herein in a manner of practice this public affairs
The embodiment opened.Therefore, through applicable legal permission, the scope of the present disclosure includes describing in this appended claims
The all modifications and equivalent of theme.In addition, the scope of the present disclosure covers any of the above-mentioned element in its all possible modification
Combination, unless herein in addition instruction or otherwise significantly with contradicted by context.
Although description of the invention is quite detailed and especially several embodiments are described, it is not
Any of these details or embodiment or any specific embodiments are intended to be limited to, but should be considered as is by reference to appended
A possibility that claim provides broad sense in view of the prior art for these claims explanation, to effectively cover the present invention
Preset range.In addition, with the foreseeable embodiment of inventor, present invention is described above, its purpose is to be provided with
Description, and those still unforeseen at present change to unsubstantiality of the invention can still represent equivalent modifications of the invention.
Claims (9)
1. a kind of method of photovoltaic direct-furnish DC power system power distribution, which comprises the following steps:
S100 photovoltaic DC direct-furnish unit output voltage Up and DC power supplier output voltage Ug on DC bus) is obtained；
S200) adjustment output voltage makes Δ U=Up- (Ug+Ustep) to be 0, and wherein Ustep is voltage steps；
S300 actual loading power P r, photovoltaic DC direct-furnish unit output power Pp and DC power supplier output power) are obtained
Pg；
S400 the value of actual loading power P r and photovoltaic DC direct-furnish unit output power Pp) are compared, and
As Pp > Pr, enableWherein, PpiFor single photovoltaic separate unit direct current direct supply module output power, n is greater than 1
Positive integer, indicate photovoltaic separate unit direct current direct supply module quantity；
As 0 < Pp < Pr, photovoltaic DC direct supply module export ratio COEFFICIENT K p, DC power supplier export ratio coefficient are adjusted
Kg and separate unit DC power supplier output power PgjValue so that gross output be equal to actual loading power P r, that is, makeWherein, n and m is greater than 1 positive integer, respectively indicates photovoltaic separate unit direct current direct-furnish mould
The quantity of block and the quantity of DC power supplier, PpiFor separate unit photovoltaic separate unit direct current direct supply module output power；
As Pp=0, enable
2. the method according to claim 1, wherein step S400 further includes following previous step:
S401) the stream output inside DC power supply mould and photovoltaic DC direct-furnish unit execute respectively.
3. the method according to claim 1, wherein step S400 further includes following postposition step:
S402) equal power output is executed in photovoltaic DC direct-furnish unit and DC power supplier respectively；
S403) MPPT maximum power point tracking is executed on photovoltaic DC direct-furnish unit；
S404 pulse-width regulated control) is executed to output electric current.
4. the method according to claim 1, wherein the Ustep is constant, and value is 1V.
5. a kind of circuit of photovoltaic direct-furnish DC power system power distribution characterized by comprising power distribution controller,
Flow equalizing circuit, stream bus, equal power circuit and MPPT maximum power point tracking adjust circuit；
The stream bus connects the flow equalizing circuit, and the equal galvanic electricity stream connects the equal power circuit, the equal power electricity
Road connects the MPPT maximum power point tracking and adjusts pulse-width regulated control circuit and the power distribution controller described in circuit connection.
6. circuit according to claim 5, which is characterized in that the flow equalizing circuit includes: that stream bus circuit, electric current is adopted
Collector and differential amplifier circuit；
Wherein, the stream bus circuit includes the first operational amplifier, first resistor, second resistance, 3rd resistor, the 4th electricity
Resistance and the 5th resistance；The first resistor connects the negative input end of first operational amplifier, and the second resistance connects institute
The positive input terminal of the first operational amplifier is stated, the 3rd resistor connects negative input end and the output of first operational amplifier
Between end, the 4th resistance connects the output end of first operational amplifier, the 5th resistance one end connection described the
The positive input terminal of one operational amplifier, other end ground connection；
Wherein, the current collection circuit includes second operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance, the 9th electricity
Resistance and the tenth resistance；6th resistance connects the negative input end of the second operational amplifier, and the 7th resistance connects institute
The positive input terminal of second operational amplifier is stated, the 8th resistance connects negative input end and the output of the second operational amplifier
Between end, the 9th resistance connects the output end of the second operational amplifier, the tenth resistance one end connection described the
The positive input terminal of two operational amplifiers, other end ground connection；
Wherein, the differential amplification electric current includes third operational amplifier, eleventh resistor and first capacitor, the third operation
The negative input end of amplifier connects one end of the 4th resistance, and positive input terminal connects the 9th resistance, first electricity
Hold and be connected in series with the eleventh resistor, and connects between the negative input end and output end of the third operational amplifier.
7. circuit according to claim 5, which is characterized in that the equal power circuit includes four-operational amplifier, the
One triode twelfth resistor；
Wherein, the positive input terminal of the four-operational amplifier connects the output end of the third operational amplifier, negative input
End connects one end of the twelfth resistor, and output end connects the base stage of first triode；First triode
Emitter connects one end of the twelfth resistor, and collector connects the input that the MPPT maximum power point tracking adjusts circuit
End；The other end of the twelfth resistor is grounded.
8. a kind of device of photovoltaic direct-furnish DC power system power distribution, which is characterized in that comprise the following modules:
First obtains module, defeated for obtaining photovoltaic DC direct-furnish unit output voltage Up and DC power supplier on DC bus
Voltage Ug out；
Voltage control module makes Δ U=Up- (Ug+Ustep) to be 0 for adjusting output voltage, and wherein Ustep is voltage steps；
Second obtains module, for obtaining actual loading power P r, photovoltaic DC direct-furnish unit output power Pp and DC power supply
Module output power Pg；
Power distribution control module, for comparing the value of actual loading power P r Yu photovoltaic DC direct-furnish unit output power Pp,
And
As Pp > Pr, enableWherein, PpiFor single photovoltaic separate unit direct current direct supply module output power, n be greater than
1 positive integer indicates the quantity of photovoltaic separate unit direct current direct supply module；
As 0 < Pp < Pr, photovoltaic DC direct supply module export ratio COEFFICIENT K p, DC power supplier export ratio coefficient are adjusted
Kg and separate unit DC power supplier output power PgjValue so that gross output be equal to actual loading power P r, that is, makeWherein, n and m is greater than 1 positive integer, respectively indicates photovoltaic separate unit direct current direct-furnish mould
The quantity of block and the quantity of DC power supplier, PpiFor separate unit photovoltaic separate unit direct current direct supply module output power；
As Pp=0, enable
9. a kind of computer readable storage medium, is stored thereon with computer instruction, it is characterised in that the instruction is held by processor
The step of method according to any one of claims 1 to 4 is realized when row.
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