CN107332301A - The energy control method of laser radio electric energy transmission system based on efficiency optimization - Google Patents
The energy control method of laser radio electric energy transmission system based on efficiency optimization Download PDFInfo
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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
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- H02J50/30—Circuit arrangements or systems for wireless supply or distribution of electric power using light, e.g. lasers
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses the energy control method of the laser radio electric energy transmission system based on efficiency optimization, belong to the technical field of laser radio electric energy transmission.Energy control strategy is mainly made up of efficiency-optimized control strategy and energy management optimisation strategy, efficiency-optimized control strategy is so that premised on the load of photovoltaic array power output satisfaction and battery power demand, the search system efficiency optimization operating point by way of progressively reducing laser input pulse electric current pulsewidth, energy management optimisation strategy is using system effectiveness and system charge power as control targe, further reduce laser input current pulsewidth with the optimal working point of search system, suitably reduce the average output power of laser during search system optimal working point to maintain photovoltaic array output voltage to pulse in the range of its restriction, avoid the excessive influence photovoltaic array efficiency of mains ripple, and then while boost battery charge demand is met and system is worked at efficiency optimization point.
Description
Technical field
The invention discloses the energy control method of the laser radio electric energy transmission system based on efficiency optimization, belong to laser
The technical field of wireless power transmission.
Background technology
With becoming increasingly popular for electrical equipment, poor mobility, no is there is to contact the traditional electricity supply mode based on conduction
Safe and reliable the problems such as.Especially in electrical equipment and electric power system have the system of relative movement, to meet physical contact
More optional equipment is needed, the application to electrical equipment brings inconvenience, and the transmission of wireless laser electric energy has transmission range
Far, the good advantage of directionality, is suitable for carrying out non-contact charge to Fast Moving Objects such as unmanned plane, tank, vehicles.
Electric energy in laser radio electric energy transmission system as shown in Figure 1, power network or energy-storage units is provided through Laser Power Devices
To the laser in Laser emission end, laser is converted electric energy to and transferred out after laser, the high optically focused in laser pick-off end
The laser of high-energy-density is converted into electric energy by type photovoltaic cell, and these electric energy are supplied to load after power converters again
And battery.At present, in the case where not considering laser space transmission loss and the loss of system pointing, system whole efficiency highest
Also there was only 14% or so, wherein, the energy conversion efficiency of laser and photovoltaic array is relatively low, and system whole efficiency lower limit should
The practical application of item technology.Therefore, integrally studied for laser and photovoltaic array, improve system whole efficiency to meet
The core that mobile electrical equipment is quick, the demand of high efficiency power is Study of Laser wireless power transmission technology.
At present, the research to laser radio electric energy transmission technology focuses mostly in terms of the lifting of system components performance, and
Research from systematic entirety energy angle is less.Because laser transmits meeting because of atmospheric refraction, aerosol scattering in an atmosphere
The reason loss luminous power such as absorb, optical power loss result in that system power supply is unstable, efficiency reduction.Therefore need to transmitting terminal
Organically combined and controlled with the coordination for realizing system capacity with receiving terminal.
In addition, many semiconductor lasers using efficiency high in current system, it is understood by semiconductor laser characteristic
Power output and electro-optical efficiency are proportional with its input current, and this means that system in whole working range
The operating point of efficiency optimization can not be ensured to be operated in constantly, it is especially less efficient in the case where transmitting lower-wattage.Therefore,
The consideration for being changed based on above efficiency with operating point and being changed, orientation optimization laser that need to be from system and the work of photovoltaic array
Point is so that it obtains optimum translation efficiency all the time in any condition, so as to improve system overall transformation efficiency.
To sum up, the key factor and rule of searching system efficiency optimization, and system capacity management strategy is proposed, it is to be lifted
The stability and high efficiency of system power supply, have important to the research for developing laser radio electric energy transmission basic theory and key technology
Theory significance and actual application value.
The content of the invention
The goal of the invention of the present invention is that there is provided the laser radio based on efficiency optimization for above-mentioned background technology not enough
The energy control method of electric energy transmission system, improves system entirety between each energy of guarantee system while power-balance
Conversion efficiency, solves the technical problem for lacking energy management is carried out for laser radio electric energy transmission system at present.
The present invention is adopted the following technical scheme that for achieving the above object：
The energy control method of laser radio electric energy transmission system based on efficiency optimization, including：Efficiency-optimized control plan
Slightly with energy management optimisation strategy,
Run after system initialization under efficiency-optimized control strategy, efficiency-optimized control strategy is so that photovoltaic array is exported
Power is met premised on load and battery power demand, by way of adjusting laser input pulse electric current pulsewidth and peak value
Change laser instantaneous transmission luminous power, so as to adjust the operating point of laser and photovoltaic array so that system is operated in efficiency most
At advantage, only it is not decreased to default minimum pulse width in laser input pulse electric current pulsewidth but photovoltaic array output voltage is pulsed
Energy management optimisation strategy is switched to when having exceeded limit value,
Energy management optimisation strategy is to meet boost battery charge demand and system is worked at efficiency optimization point
Target, further adjusts system operating point to improve system effect by way of progressively reducing laser input pulse electric current pulsewidth
Rate, reduces laser average emitted luminous power to maintain photovoltaic array by way of reducing laser input pulse current peak
The pulsation of output voltage is in the range of its restriction.
As the further prioritization scheme of the energy control method of the laser radio electric energy transmission system based on efficiency optimization,
Efficiency-optimized control strategy is with photovoltaic array power output and photovoltaic array rear class busbar voltage and laser input pulse electricity
Stream pulsewidth is control variable, using system effectiveness as control targe, and load and battery are met making photovoltaic array power output
Ensure that system is operated at efficiency optimization point on the premise of power demand, be specially：
Change the average value of laser input current benchmark by feedback control to ensure that photovoltaic array power output is met
Load and the power demand of battery：When photovoltaic array power output is unsatisfactory for the power demand of load and battery, according to
The difference of photovoltaic array power output and its maximum determines the average value of laser input current benchmark, otherwise, according to photovoltaic
The difference of array output power and the difference, photovoltaic array rear class busbar voltage and its maximum of its maximum determines that laser is defeated
Enter the average value of current reference；
Thought based on method of perturbation, system effectiveness optimum point is determined by way of changing laser input current pulsewidth：
When current time system effectiveness exceedes previous moment system effectiveness, reduce the arteries and veins of laser input pulse electric current subsequent time
Width, increases the peak value of laser input pulse electric current subsequent time to maintain photovoltaic array power output constant,
When current time system effectiveness is not less than previous moment system effectiveness, increase laser input pulse electric current is next
The pulsewidth at moment, reduces the peak value of laser input pulse electric current subsequent time to maintain photovoltaic array power output constant,
The input power of sampling laser subsequent time laser is imitated with determining the system effectiveness of subsequent time according to system
Rate adjusts the pulsewidth of laser input pulse electric current in real time, only laser input pulse electric current pulsewidth be not reduced to it is default most
Small pulsewidth but photovoltaic array output voltage pulsation exceed limit value when switch to energy management optimisation strategy.
As the further prioritization scheme of the energy control method of the laser radio electric energy transmission system based on efficiency optimization,
Energy management optimisation strategy is filled using the pulsewidth and peak value of laser input pulse electric current as control variable with system effectiveness and system
Electrical power is control targe, further reduces the pulsewidth of laser input pulse electric current with the optimal working point of search system, searches
Suitably reduce the average output power of laser during cable system optimal working point to maintain photovoltaic array output voltage arteries and veins
Move in the range of its restriction, and then while boost battery charge demand is met and system is worked in efficiency optimization point
Place, be specially：
Exceed its maximum and the system at current time in current time system effectiveness and the weighted value of system charge power
When efficiency is more than or equal to photovoltaic array maximum output voltage pulsation corresponding system effectiveness, the weighted value using current time is it
Maximum, using current time laser input pulse electric current pulsewidth as the optimal value of laser input pulse electric current pulsewidth, to work as
Preceding moment laser input pulse current peak is the optimal value of laser input pulse current peak, then, is further reduced
The pulsewidth of laser input pulse electric current subsequent time, adjusts the peak value of laser input pulse electric current subsequent time to maintain light
Photovoltaic array output voltage is pulsed in the range of its restriction,
When the pulsewidth of laser input pulse electric current subsequent time is less than default minimum pulse width, feedback laser input
Pulse current pulsewidth and the optimal value of peak value are system optimal operating point,
Otherwise, the input power of sampling laser subsequent time laser and the power output of photovoltaic array are next to determine
The weighted value at moment, the pulsewidth and peak value of laser input pulse electric current are adjusted according to weighted value in real time；
It is not less than its maximum or current time in current time system effectiveness and the weighted value of system charge power
When efficiency of uniting is less than photovoltaic array maximum output voltage pulsation corresponding system effectiveness, reduce laser input pulse electric current next
The pulsewidth at moment, adjusts the peak value of laser input pulse electric current subsequent time to maintain photovoltaic array output voltage to pulse at it
In the range of restriction, according to laser input pulse electric current pulsewidth Real-time Feedback optimum control variable or sampling laser subsequent time
The input power of laser and the power output of photovoltaic array.
It is used as the further optimization side of the energy control method of the laser radio electric energy transmission system based on efficiency optimization
Case, the average value of laser input current benchmark is determined according to the difference of photovoltaic array power output and its maximum, is specially：
Difference to photovoltaic array power output and its maximum carries out PI feedback regulations.
It is used as the further optimization side of the energy control method of the laser radio electric energy transmission system based on efficiency optimization
Case, according to the difference of the difference, photovoltaic array rear class busbar voltage and its maximum of photovoltaic array power output and its maximum
The average value of laser input current benchmark is determined, is specially：Difference respectively to photovoltaic array power output and its maximum,
The difference of photovoltaic array rear class busbar voltage and its maximum carries out PI feedback regulations and obtains photovoltaic array power output deviation
The PI regulated values of PI regulated values, photovoltaic array rear class busbar voltage deviation, with the PI regulated values of photovoltaic array power output deviation
Accumulated value with the PI regulated values of photovoltaic array rear class busbar voltage deviation is the average value of laser input current benchmark.
It is used as the further optimization side of the energy control method of the laser radio electric energy transmission system based on efficiency optimization
The weighted value of case, current time system effectiveness and system charge power is by expression formula：Calculate, J
(n) it is the system effectiveness and system charge power weighted value, η at current time*(n)、Respectively current time system is imitated
The perunit value of rate, system charge power, a and b be current time system effectiveness, the weight coefficient of system charge power perunit value, Pin_avg(n)、Ppv_avg(n) be respectively current time laser input work
Rate, the power output of photovoltaic array, Pbat(n)、Pbat_max(n) be respectively battery in current time system charge power and
The maximum charge power of setting.
The present invention uses above-mentioned technical proposal, has the advantages that：
(1) consider that the research for carrying out energy management for laser radio electric energy transmission system in the prior art is less, this
Invention proposes a kind of energy control strategy of the laser radio electric energy transmission system based on efficiency optimization, mainly by efficiency optimization control
System strategy and energy management optimisation strategy composition, wherein, efficiency-optimized control strategy is so that photovoltaic array power output meets negative
Premised on load and battery power demand, the search system efficiency by way of progressively reducing laser input pulse electric current pulsewidth
Optimal working point, energy management optimisation strategy further reduces laser using system effectiveness and system charge power as control targe
Device input current pulsewidth is appropriate during search system optimal working point to reduce laser with the optimal working point of search system
The average output power of device with maintain photovoltaic array output voltage pulsation in the range of its restriction, it is to avoid the excessive influence of mains ripple
Photovoltaic array efficiency, and then while boost battery charge demand is met and system is worked at efficiency optimization point, it is whole
Individual energy control method optimizes the pulsewidth of LD pulse input electric currents on the premise of the energy needed for proof load and power storage cell
To improve system effectiveness, the stability and high efficiency of system power supply are improved；
(2) energy management strategies proposed by the invention are examined succinctly to facilitate, amount of calculation is small, switches smoothly between pattern, exempt from
The logic switch of complexity is removed.
Brief description of the drawings
Fig. 1 is the generic structure diagram of laser power Transmission system；
Fig. 2 is LD efficiency and its average optical output power graph of relation under continuous/pulse mode；
Fig. 3 is efficiency curve diagram of the photovoltaic array under continuous/pulse light irradiation；
Fig. 4 is laser and the overall efficiency curve diagram of photovoltaic array；
Fig. 5 is the control flow chart of energy management optimisation strategy；
Fig. 6 is the experimental result picture of laser radio electric energy transmission system energy management.
Embodiment
The technical scheme to invention is described in detail below in conjunction with the accompanying drawings.
In laser radio electric energy transmission system shown in Fig. 1, semiconductor laser (Laser Diode, LD) turns electric energy
Change laser, photovoltaic receiver of the laser through free space transmission to distal end into.In receiving terminal, photovoltaic array changes laser again
Into electric energy, the electric energy is supplied to load and energy-storage units after the conversion of converter.Wherein, LD is current-injecting device,
The input current of different characteristic has a significant impact to its efficiency.
Fig. 2 is LD efficiency under continuous/pulse mode and its average optical output power relation curve, and as seen from the figure, LD is defeated
Enter electric current more excellent for efficiency in the case of pulse current, and in the case of identical Output optical power, the smaller efficiency of electric current pulsewidth
It is higher.
Fig. 3 is efficiency curve of the photovoltaic array under continuous/pulse light irradiation, as seen from the figure, with the light of average incident
Power is bigger, and the fuel factor of photovoltaic array is more serious, and its efficiency is lower, and in continuous illumination to penetrate lower efficiency more excellent for photovoltaic array,
And under pulse light irradiation, light pulsewidth is narrower, photovoltaic array efficiency is lower.
Can obtaining laser and the overall efficiency of photovoltaic array in system according to Fig. 2 and Fig. 3, (photovoltaic array exports mean power
The ratio between with laser Mean Input Power) curve, as shown in figure 4, as seen from the figure, the pulsewidth of LD input currents is the overall electricity of influence
The factor of energy efficiency of transmission, and in the case where transmitting identical luminous power, the smaller efficiency of electric current pulsewidth is higher.Therefore energy management
The task of strategy is exactly the pulsewidth for optimizing LD pulse input electric currents, on the premise of the energy needed for proof load and power storage cell
Improve system effectiveness.
It is mainly excellent by efficiency-optimized control strategy and energy management shown in energy control strategy Fig. 1 based on efficiency optimization
Change strategy composition, wherein, efficiency-optimized control strategy is so that photovoltaic array power output meets load and battery power demand
Premised on, the search system efficiency optimization operating point by way of progressively reducing laser input pulse electric current pulsewidth.Energy pipe
Optimisation strategy is managed using system effectiveness and system charge power as control targe, is further reducing laser input current pulsewidth,
During search system optimal working point, by suitably reducing the average output power of laser to maintain photovoltaic array defeated
Go out mains ripple in the range of its restriction, it is to avoid the excessive influence photovoltaic array efficiency of mains ripple, so it is fast meeting battery
While fast charge requirement and system is set to work at efficiency optimization point.
Energy control strategy based on efficiency optimization is based primarily upon the laser shown in Fig. 4 and the efficiency of photovoltaic array entirety
Curve optimizes the pulsewidth of LD pulse input electric currents, so as to improve the efficiency of system.Major control thought is：Ensureing laser
In the case of average emitted power (i.e. photovoltaic array is supplied to load and storage battery energy constant), by optimizing LD pulse inputs
The pulsewidth and peak value of electric current changes the instantaneous value of laser transmission power, so as to adjust laser and the overall work of photovoltaic array
Make a little, to make system whole work efficiency optimal.
System is operated in efficiency-optimized control strategy first, to ensure that photovoltaic array power output meets load and battery
Power demand, as shown in figure 1, selection photovoltaic array power output PpvAnd photovoltaic array rear class busbar voltage Vo becomes as control
Amount, with the average value i of laser input current benchmarkDC_refIt is used as control targe.When the power output of photovoltaic array can not be met
Needed for load and battery charge during the summation of power, busbar voltage (the i.e. photovoltaic array rear class busbar voltage of system receiving terminal
Vo it) will not be over allowed maximum V_max, diode D blockings, photovoltaic array power output PpvWith default photovoltaic battle array
Row power output maximum P_maxThe error for being compared rear gained will be as laser input current base after PI feedback regulations
Accurate average value.When system receiving terminal busbar voltage Vo is more than allowed maximum V_maxWhen, it is meant that photovoltaic array it is defeated
Go out the summation of power needed for power is more than load and battery charging, the now output of pi regulator 2 will be negative value, make diode
D is turned on, and the output of pi regulator 2 makes the average value i of the current reference of injection laser as adjustment signalDC_refReduce, that is, subtract
The power output of small laser, so as to reduce the power output of photovoltaic array.
On the premise of ensureing that laser average optical output power is certain, laser input current pulsewidth is gradually reduced, is made
Obtain laser peak power increase, efficiency increase, but the pulsation of photovoltaic array output voltage to be consequently increased, due to system receiving terminal
The pulsation increase of busbar voltage so that the situation that photovoltaic array deviates maximum power point is more serious, so that the lifting of efficiency is influenceed,
Therefore the pulsation Δ V of photovoltaic array output voltagepvIt must be limited in a zone of reasonableness.When laser input current pulsewidth not
It is decreased to default minimum pulse width but the pulsation of photovoltaic array output voltage exceedes limit value Δ Vpv_maxWhen (such as A points institute in Fig. 4
Show), energy management optimisation strategy switches to energy management optimisation strategy.
The basic control thought of energy management optimisation strategy is：Assuming that system overall work is in the A points shown in Fig. 4, if
Continue the pulsewidth of reduction LD input currents, B points and C points as shown in Figure 4, the pulsation of photovoltaic array output voltage, which will exceed, to be limited
Value, is further to improve system whole efficiency while the pulsation of photovoltaic array output voltage is controlled, in such as B points and C point scuns
In the case of width, the charge power (but bearing power is constant) by sacrificing part battery is gradually reduced by control strategy
The peak value of luminous power is until Δ Vpv≤ΔVpv_max, D points and E points as shown in Figure 4 improve system whole efficiency.Relative to D
Pulsewidth at point, E points is smaller, more efficient, but to ensure identical photovoltaic array output voltage pulsation Δ Vpv, laser it is flat
Equal transmission power will be smaller, that is, the charge power sacrificed is more.Therefore, will be public by weighting for the situation of such as D points and E points
Formula is weighed to the efficiency of raising and the charge power of sacrifice, so that it is determined that going out while meeting high efficiency and quick charge purpose
System optimal operating point.Specific weighted formula is as follows：
In formula, a and b are weight coefficient, η*(n) andFor current time system effectiveness, the perunit of system charge power
Value, be specially：
In formula (2) and (3), Pin_avg(n)、Ppv_avg(n) be respectively current time laser input power, photovoltaic battle array
The power output of row, Pbat(n)、Pbat_max(n) be respectively battery in current time system charge power and setting maximum
Charge power.
In summary, the control flow chart of the energy control strategy based on efficiency optimization is as shown in figure 5, concrete methods of realizing
It is as follows：
By judging whether receiving terminal load and power needed for battery change, determine whether control strategy runs, initially
In the change stage, laser input current pulsewidth is set as 1, as straight continuous current, the current amplitude is set as by feedback
Control obtained average current benchmark iDC_ref；
Pulse and meet in photovoltaic array output voltage：ΔVpv≤ΔVpv_maxWhen, system is operated in efficiency-optimized control plan
Slightly, photovoltaic array average output power P is being ensuredpv_avgIn the case of certain, laser pulse is adjusted by perturbation observation method defeated
Enter the pulsewidth D sizes of electric current to improve system effectiveness η, in this course, when system effectiveness η with pulsewidth D reduction gradually
During increase, to ensure photovoltaic array average output power Ppv_avgIt is constant, laser input current peak value irefAlso accordingly increase,
Cause photovoltaic array mains ripple Δ VpvIncrease, and bigger Δ VpvSo that the situation that photovoltaic array deviates maximum power point is got over
Seriously, so as to influence the lifting of efficiency, therefore as Δ Vpv>ΔVpv_maxWhen, system will switch to energy management optimisation strategy；
When system enters energy management optimisation strategy, control strategy will continue to reduce laser input current pulsewidth D, with
The more excellent operating point of search efficiency, in this course, for a certain specific laser input current pulsewidth D, control strategy
The peak value of laser output power will be reduced, by sacrificing the battery charge power of part, to ensure photovoltaic array output electricity
Pressure pulsation is met：ΔVpv≤ΔVpv_max, while the purpose for improving system effectiveness is reached, for various lasers input current arteries and veins
The corresponding operating point of wide D, the often raising of efficiency is charged the reduction of rapidity along with system, therefore to ensure high efficiency and fast
The purpose of speed charging, control strategy will compare the work under these various lasers input current pulsewidths by weighted formula (1)
Point, so that it is determined that going out the operating point of system optimal.
Example of the present invention is as follows：With a peak laser power 50W, photovoltaic array maximum output
Exemplified by 1W, Fig. 6 is the experimental result by laser radio electric energy transmission system energy management.Dotted line is not consider photovoltaic battle array in figure
In the case that row output voltage is pulsed, i.e., system is only operated under efficiency-optimized control strategy, and system effectiveness is inputted with laser
The curve of electric current pulsewidth.It can be seen that in the case where keeping photovoltaic array output mean power to be 0.9W constant, with subtracting for pulsewidth
It is small, system effectiveness increase, but be that at 0.45 cycle, system effectiveness increment is reduced in pulsewidth, its main cause is larger light
Photovoltaic array output voltage, which is pulsed, make it that the situation of photovoltaic array deviation maximum power point is more serious.Solid line is consideration photovoltaic in figure
In the case that array output voltage is pulsed, i.e., system is by efficiency-optimized control strategy to be switched to energy at 0.55 cycle in pulsewidth
Buret manage optimisation strategy situation, system effectiveness with laser input current pulsewidth curve.It can be seen that being 0.55 He in pulsewidth
At 0.45 cycle, the pulsation of photovoltaic array output voltage is ensured while system effectiveness in a rational scope to improve,
Control strategy reduces the power output of photovoltaic array accordingly, and finally have selected pulsewidth according to weighted formula is 0.55 cycle
For the best operating point of system.
Claims (6)
1. the energy control method of the laser radio electric energy transmission system based on efficiency optimization, it is characterised in that including：Efficiency is most
Excellent control strategy and energy management optimisation strategy,
Run after system initialization under efficiency-optimized control strategy, efficiency-optimized control strategy is so that photovoltaic array power output
Meet premised on load and battery power demand, changed by way of adjusting laser input pulse electric current pulsewidth and peak value
Laser instantaneous transmission luminous power, so as to adjust the operating point of laser and photovoltaic array so that system is operated in efficiency optimization point
Place, is not only decreased to default minimum pulse width in laser input pulse electric current pulsewidth but the pulsation of photovoltaic array output voltage has surpassed
Energy management optimisation strategy is switched to when crossing limit value,
Energy management optimisation strategy to meet boost battery charge demand and system is worked at efficiency optimization point as target,
Further adjust system operating point to improve system effectiveness by way of progressively reducing laser input pulse electric current pulsewidth, lead to
The mode for crossing reduction laser input pulse current peak reduces laser average emitted luminous power to maintain photovoltaic array to export
The pulsation of voltage is in the range of its restriction.
2. the energy control method of the laser radio electric energy transmission system based on efficiency optimization according to claim 1, it is special
Levy and be, the efficiency-optimized control strategy is with photovoltaic array power output and photovoltaic array rear class busbar voltage and laser
Input pulse electric current pulsewidth is control variable, using system effectiveness as control targe, and load is met making photovoltaic array power output
Ensure that system is operated at efficiency optimization point with the premise of the power demand of battery, be specially：
When photovoltaic array power output is unsatisfactory for the power demand of load and battery, according to photovoltaic array power output and its
The difference of maximum determines the average value of laser input current benchmark, otherwise, according to photovoltaic array power output and its maximum
The difference of the difference of value, photovoltaic array rear class busbar voltage and its maximum determines the average value of laser input current benchmark；
When current time system effectiveness exceedes previous moment system effectiveness, reduce laser input pulse electric current subsequent time
Pulsewidth, increases the peak value of laser input pulse electric current subsequent time to maintain photovoltaic array power output constant,
When current time system effectiveness is not less than previous moment system effectiveness, increase laser input pulse electric current subsequent time
Pulsewidth, reduce laser input pulse electric current subsequent time peak value to maintain photovoltaic array power output constant,
The input power of sampling laser subsequent time laser is real according to system effectiveness to determine the system effectiveness of subsequent time
When adjust laser input pulse electric current pulsewidth, be not only reduced to default most scun in laser input pulse electric current pulsewidth
The pulsation of wide but photovoltaic array output voltage switches to energy management optimisation strategy when having exceeded limit value.
3. the energy control method of the laser radio electric energy transmission system according to claim 1 or claim 2 based on efficiency optimization, its
It is characterised by, energy management optimisation strategy is imitated using the pulsewidth and peak value of laser input pulse electric current as control variable with system
Rate and system charge power are control targe, further reduce the pulsewidth of laser input pulse electric current with the optimal of search system
Suitably reduce the average output power of laser during operating point, search system optimal working point to maintain photovoltaic array defeated
Go out mains ripple in the range of its restriction, and then while boost battery charge demand is met and system is worked in efficiency
At optimum point, it is specially：
Exceed its maximum and the system effectiveness at current time in current time system effectiveness and the weighted value of system charge power
It is maximum using the weighted value at current time as it during more than or equal to the photovoltaic array maximum output voltage corresponding system effectiveness of pulsation
Value, using current time laser input pulse electric current pulsewidth as the optimal value of laser input pulse electric current pulsewidth, with it is current when
The optimal value that laser input pulse current peak is laser input pulse current peak is carved, then, further reduces laser
The pulsewidth of device input pulse electric current subsequent time, adjusts the peak value of laser input pulse electric current subsequent time to maintain photovoltaic battle array
Row output voltage is pulsed in the range of its restriction,
When the pulsewidth of laser input pulse electric current subsequent time is less than default minimum pulse width, feedback laser input pulse
Electric current pulsewidth and the optimal value of peak value are system optimal operating point,
Otherwise, the input power of sampling laser subsequent time laser and the power output of photovoltaic array are to determine subsequent time
Weighted value, adjust the pulsewidth and peak value of laser input pulse electric current in real time according to weighted value；
Imitated in current time system effectiveness and the weighted value of system charge power not less than its maximum or the system at current time
When rate is less than photovoltaic array maximum output voltage pulsation corresponding system effectiveness, reduce laser input pulse electric current subsequent time
Pulsewidth, adjust laser input pulse electric current subsequent time peak value with maintain photovoltaic array output voltage pulsation its restriction
In the range of, according to laser input pulse electric current pulsewidth Real-time Feedback optimum control variable or sampling laser subsequent time laser
The input power of device and the power output of photovoltaic array.
4. the energy control method of the laser radio electric energy transmission system based on efficiency optimization according to claim 2, it is special
Levy and be, the average value of laser input current benchmark, tool are determined according to the difference of photovoltaic array power output and its maximum
Body is：Difference to photovoltaic array power output and its maximum carries out PI feedback regulations.
5. the energy control method of the laser radio electric energy transmission system based on efficiency optimization according to claim 2, it is special
Levy and be, according to the difference, photovoltaic array rear class busbar voltage and its maximum of photovoltaic array power output and its maximum
Difference determines the average value of laser input current benchmark, is specially：Respectively to photovoltaic array power output and its maximum
It is inclined that the difference progress PI feedback regulations of difference, photovoltaic array rear class busbar voltage and its maximum obtain photovoltaic array power output
PI regulated values, the PI regulated values of photovoltaic array rear class busbar voltage deviation of difference, are adjusted with the PI of photovoltaic array power output deviation
The accumulated value of the PI regulated values of section value and photovoltaic array rear class busbar voltage deviation is the average value of laser input current benchmark.
6. the energy control method of the laser radio electric energy transmission system based on efficiency optimization according to claim 3, it is special
Levy and be, the weighted value of current time system effectiveness and system charge power is by expression formula：Meter
Calculate, J (n) is the system effectiveness and system charge power weighted value, η at current time*(n)、Respectively current time system
The perunit value of efficiency, system charge power, a and b are current time system effectiveness, the weighting system of system charge power perunit value
Number, Pin_avg(n)、Ppv_avg(n) it is respectively the defeated of current time laser
Enter the power output of power, photovoltaic array, Pbat(n)、Pbat_max(n) be respectively battery in current time system charging work(
Rate and the maximum charge power of setting.
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