CN115241865B - Combined energy power supply circuit applied to aerostat and power supply control method - Google Patents

Combined energy power supply circuit applied to aerostat and power supply control method Download PDF

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Publication number
CN115241865B
CN115241865B CN202211161675.5A CN202211161675A CN115241865B CN 115241865 B CN115241865 B CN 115241865B CN 202211161675 A CN202211161675 A CN 202211161675A CN 115241865 B CN115241865 B CN 115241865B
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power
circuit
power generation
voltage
power supply
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CN115241865A (en
Inventor
蔡榕
熊振阳
徐国宁
李永祥
贾忠臻
李兆杰
杜浩
黄庭双
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Aerospace Information Research Institute of CAS
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Aerospace Information Research Institute of CAS
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Priority to PCT/CN2023/119745 priority patent/WO2024061221A1/en
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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
    • H02J1/102—Parallel operation of dc sources being switching converters
    • 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
    • H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
    • 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
    • H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
    • 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
    • H02J1/14—Balancing the load in a network
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy

Abstract

The invention provides a combined energy power supply circuit applied to an aerostat and a power supply control method, and relates to the technical field of power supplies, wherein the combined energy power supply circuit comprises: solar energy power generation circuit, wind power generation circuit, laser power generation circuit, direct current bus, energy storage battery and load circuit, wherein: the solar power generation circuit, the wind power generation circuit and the laser power generation circuit are connected with the energy storage battery and the load circuit through the direct current bus and are used for supplying power to the load circuit and charging the energy storage battery; the energy storage battery is connected with the load circuit through the direct current bus and used for supplying power to the load circuit, and power supply control is carried out based on actual power consumption requirements of the aerostat and the charge state of the energy storage battery, so that the technical problems that an existing energy power supply system cannot meet the energy supply requirements of the aerostat for executing long-endurance air-parking tasks and the requirements of the aerostat for carrying high-power loads are solved.

Description

Combined energy power supply circuit applied to aerostat and power supply control method
Technical Field
The invention relates to the technical field of power supplies, in particular to a combined energy power supply circuit applied to an aerostat and a power supply control method.
Background
The aerostat generally refers to an aircraft which is lighter than air in specific gravity and is lifted by the buoyancy of the atmosphere. The long-endurance aerostat can make up the defects that airplanes and satellites cannot be used for long-time navigation and fixed-point residence. The energy power supply system is used as an energy source of the long-endurance aerostat, and directly determines the continuous working time of the aerostat for executing the long-endurance standing-in-air task and the power of the aerostat carrying the load.
In the prior art, since aerostats such as high-altitude balloons and airships cannot be directly supplied with power from the ground through a transmission cable, a solar power generation circuit and an energy storage battery are generally adopted to supply power to the aerostat. However, the solar power generation circuit has low power generation efficiency, and the laying area of the solar photovoltaic array and the energy storage capacity of the energy storage battery are limited by space and weight, so that the energy supply requirement of the aerostat for performing long-endurance parking tasks and the requirement of the aerostat for carrying higher-power loads cannot be met.
Therefore, the technical problem that the existing energy power supply system cannot meet the energy supply requirement of the aerostat for executing the long-endurance parking task and the requirement of the aerostat for carrying a load with larger power is solved.
Disclosure of Invention
The invention provides a combined energy power supply circuit applied to an aerostat and a power supply control method, which are used for solving the technical problems that an existing energy power supply system cannot meet the energy supply requirement of the aerostat for executing a long-endurance parking task and the requirement of the aerostat for carrying a load with larger power.
The invention provides a combined energy power supply circuit applied to an aerostat, which comprises: solar energy power generation circuit, wind power generation circuit, laser power generation circuit, direct current bus, energy storage battery and load circuit, wherein:
the solar power generation circuit, the wind power generation circuit and the laser power generation circuit are connected with the energy storage battery and the load circuit through the direct current bus and are used for supplying power to the load circuit and charging the energy storage battery;
the energy storage battery is connected with the load circuit through the direct current bus and used for supplying power to the load circuit.
According to the combined energy power supply circuit applied to the aerostat, the wind power generation circuit comprises a wind power generator, a full-bridge rectification circuit and a voltage reduction conversion circuit, wherein:
the full-bridge rectifying circuit is connected with the wind driven generator and is used for converting alternating current generated by the wind driven generator into direct current;
the voltage reduction conversion circuit is connected with the full-bridge rectification circuit and used for converting the direct-current voltage output by the full-bridge rectification circuit into wind power generation voltage matched with direct-current bus voltage, and the direct-current bus voltage represents the voltage on the direct-current bus.
According to the combined energy power supply circuit applied to the aerostat, the solar power generation circuit comprises a solar photovoltaic array and a first boost conversion circuit, wherein:
the solar photovoltaic array is used for converting solar energy into direct current and outputting the direct current;
the first boost conversion circuit is connected with the solar photovoltaic array and used for converting the direct-current voltage output by the solar photovoltaic array into solar power generation voltage matched with direct-current bus voltage.
According to the combined energy power supply circuit applied to the aerostat, the laser power generation circuit comprises a laser photovoltaic array and a second boost conversion circuit, wherein:
the laser photovoltaic array is used for converting laser energy into direct current and outputting the direct current;
the second boost conversion circuit is connected with the laser photovoltaic array and used for converting the direct-current voltage output by the laser photovoltaic array into laser power generation voltage matched with direct-current bus voltage.
According to the combined energy power supply circuit applied to the aerostat, the combined energy power supply circuit further comprises: the super capacitor is arranged between the energy storage battery and the load circuit;
the super capacitor is connected with the load circuit through the direct current bus and used for storing energy output by the solar power generation circuit, the wind power generation circuit and the laser power generation circuit and supplying power to the load circuit.
The invention also provides a power supply control method, which comprises the following steps:
acquiring wind power generation power, solar power generation power, load power, current voltage of an energy storage battery, current, maximum charging voltage and minimum discharging voltage;
calculating first total power based on the wind power generation power and the solar power generation power, and judging whether the first total power is larger than the load power;
determining a power supply control signal of a combined energy power supply circuit based on the current voltage and the maximum charging voltage of the energy storage battery under the condition that the first total power is greater than the load power; the power supply control signal acts on at least one of the solar power generation circuit, the wind power generation circuit, the laser power generation circuit and the energy storage battery;
determining a power supply control signal of a combined energy power supply circuit based on the current voltage and the minimum discharge voltage of the energy storage battery under the condition that the first total power is less than or equal to the load power;
the combined energy power supply circuit is the combined energy power supply circuit applied to the aerostat.
According to a power supply control method provided by the present invention, the determining a power supply control signal of a combined energy power supply circuit based on the current voltage and the maximum charging voltage of the energy storage battery comprises:
judging whether the current voltage of the energy storage battery is greater than the maximum charging voltage or not;
under the condition that the current voltage of the energy storage battery is greater than the maximum charging voltage, controlling the direct-current bus voltage, the wind power generation voltage and the solar power generation voltage to be the maximum charging voltage;
and determining a power supply control signal of the combined energy power supply circuit based on the load power, the maximum charging power of the energy storage battery and the first total power under the condition that the current voltage of the energy storage battery is less than or equal to the maximum charging voltage.
According to a power supply control method provided by the present invention, the determining a power supply control signal of a combined energy power supply circuit based on the load power, the maximum charging power of an energy storage battery, and the first total power includes:
calculating a second total power based on the load power and the maximum charging power, and judging whether the first total power is greater than the second total power;
determining a load current and a charging current based on a maximum charging power, a direct current bus voltage and a rated load power of a load circuit in the case that the first total power is greater than the second total power;
and under the condition that the first total power is less than or equal to the second total power, controlling the solar power generation circuit to output the maximum photovoltaic power generation power and controlling the wind power generation circuit to output the maximum wind power generation power.
According to a power supply control method provided by the present invention, the determining a power supply control signal of a combined energy power supply circuit based on the current voltage and the minimum discharge voltage of the energy storage battery comprises:
judging whether the current voltage of the energy storage battery is greater than the minimum discharge voltage or not;
under the condition that the current voltage of the energy storage battery is greater than the minimum discharge voltage, controlling the solar power generation circuit to output the maximum photovoltaic power generation power and controlling the wind power generation circuit to output the maximum wind power generation power, and controlling the energy storage battery to supply power to the load circuit;
and under the condition that the current voltage of the energy storage battery is less than or equal to the minimum discharge voltage, controlling the solar power generation circuit to output the maximum photovoltaic power generation power, controlling the wind power generation circuit to output the maximum wind power generation power and controlling the laser power generation circuit to output the maximum laser power generation power.
According to a power supply control method provided by the invention, the method further comprises the following steps:
acquiring output current and output voltage of a power generation circuit to be tracked, wherein the power generation circuit to be tracked comprises at least one of a solar power generation circuit, a wind power generation circuit and a laser power generation circuit;
acquiring an initial control signal based on the output current, the output voltage and a maximum power tracking algorithm;
acquiring current control parameters corresponding to a power generation circuit to be tracked, and adjusting the initial control signal based on the current control parameters to obtain a target control signal;
and controlling the power generation circuit to be tracked to output the maximum power generation power based on the target control signal.
According to the combined energy power supply circuit and the power supply control method applied to the aerostat, the wind power generation circuit and the laser power generation circuit are coupled with the solar power generation circuit, so that the energy generated by the wind power generation circuit and the laser power generation circuit is used as the supplementary supply energy of the aerostat under the condition that the energy provided by the solar power generation circuit cannot meet the energy supply requirement of the aerostat and the power requirement of the aerostat carrying a load, the defect that the energy supplied by the solar power generation circuit is insufficient is overcome, and the technical problems that an existing energy power supply system cannot meet the energy supply requirement of the aerostat for performing a long-endurance air-parking task and the requirement of the aerostat carrying a load with higher power are solved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a combined energy supply circuit applied to an aerostat according to an embodiment of the present invention;
fig. 2 is a second schematic circuit diagram of the combined energy supply circuit applied to the aerostat according to the second embodiment of the present invention;
fig. 3 is a circuit diagram of a combined energy supply circuit applied to an aerostat according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a power supply control method according to an embodiment of the present invention;
fig. 5 is a second schematic flow chart of a power supply control method according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an overall power supply control flow in an embodiment of the present invention;
fig. 7 is a third schematic flowchart of a power supply control method according to an embodiment of the present invention;
fig. 8 is a fourth schematic flowchart of a power supply control method according to an embodiment of the present invention;
fig. 9 is a fifth flowchart illustrating a power supply control method according to an embodiment of the invention;
fig. 10 is a schematic structural diagram of a power supply control circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a combined energy supply circuit applied to an aerostat, comprising: solar power generation circuit 10, wind power generation circuit 20, laser power generation circuit 30, direct current bus 40, energy storage battery 50 and load circuit 60, wherein:
the solar power generation circuit 10, the wind power generation circuit 20 and the laser power generation circuit 30 are all connected with the energy storage battery 50 and the load circuit 60 through the direct current bus 40, and are used for supplying power to the load circuit 60 and charging the energy storage battery 50.
The energy storage battery 50 is connected to the load circuit 60 via the dc bus 40, and is used to supply power to the load circuit 60.
The bus bar is a common path to which a plurality of devices are connected in parallel and branched. Further, the solar power generation circuit 10, the wind power generation circuit 20, the laser power generation circuit 30, the energy storage battery 50, and the load circuit 60 are connected to the dc bus 40 in a parallel branch form.
Wind power generation is a clean and renewable power generation mode, and the wind power generation circuit 20 can continuously generate electric energy in a windy environment. The laser can transmit energy in a light form in a space for a long distance due to the characteristics of good monochromaticity, strong directivity, large power density and energy concentration. The laser power generation circuit 30 converts light energy into electric energy by using the semiconductor photovoltaic power generation principle.
According to the combined energy power supply circuit provided by the invention, the wind power generation circuit 20 and the laser power generation circuit 30 are coupled with the solar power generation circuit 10, so that under the condition that the energy provided by the solar power generation circuit 10 cannot meet the energy supply requirement of an aerostat and the power requirement of a load carried by the aerostat, the energy generated by the wind power generation circuit 20 and the laser power generation circuit 30 is used as the supplementary supply energy of the aerostat to make up for the defect that the energy supplied by the solar power generation circuit 10 is insufficient, and the technical problems that the energy supply requirement of the aerostat for performing a long-endurance air-parking task and the requirement of the aerostat for carrying a high-power load cannot be met by the existing energy power supply system are solved.
In one embodiment, as shown in fig. 2, the wind power generation circuit 20 includes a wind power generator 21, a full-bridge rectification circuit 22 and a buck conversion circuit 23, wherein:
the full-bridge rectifier circuit 22 is connected to the wind turbine generator 21, and converts the ac power generated by the wind turbine generator 21 into dc power. The wind power generator 21 is configured to convert wind energy into electric energy and output alternating current.
The step-down converter circuit 23 is connected to the full-bridge rectifier circuit 22, and converts the dc voltage output from the full-bridge rectifier circuit 22 into a wind power generation voltage matching a dc bus voltage, which represents a voltage on the dc bus 40.
Since the dc voltage output from the ac power generated by the wind turbine generator 21 after being converted by the full-bridge rectifier circuit 22 is large and does not match the dc bus voltage, the step-down converter circuit 23 needs to convert the dc voltage output from the full-bridge rectifier circuit 22 into the wind turbine generator voltage matching the dc bus voltage by using the step-down conversion characteristic thereof.
According to the combined energy power supply circuit provided by the embodiment, alternating current generated by the wind driven generator 21 is converted into direct current through the full-bridge rectification circuit 22, direct current voltage output by the full-bridge rectification circuit 22 is subjected to voltage reduction conversion through the voltage reduction conversion circuit 23, so that the output wind power generation voltage is matched with the direct current bus voltage, and the direct current bus voltage output by the wind power generation circuit 20 can be directly used by the load circuit 60 without any voltage conversion circuit because the direct current bus voltage is consistent with the load voltage required by the load circuit 60, so that the defect of energy loss caused by the fact that the direct current bus voltage is converted into the load voltage through the voltage conversion circuit can be avoided, and the energy utilization rate and the performance of the combined energy power supply circuit are improved.
In one embodiment, the wind power generation circuit 20 further comprises a first current-guiding diode and a first voltage stabilizing circuit, and the buck converter circuit 23 further comprises a first synchronous rectification circuit, wherein:
the anode of the first conduction diode is connected with the full-bridge rectification circuit 22, and the cathode is connected with the first voltage stabilizing circuit. The first current-guiding diode is used for inputting the direct current output by the full-bridge rectification circuit 22 into the first voltage stabilizing circuit, so that the first voltage stabilizing circuit can stabilize the direct current voltage output by the full-bridge rectification circuit 22, and the problem that the direct current output by the energy storage battery 50 flows backwards into the wind driven generator 21 through the direct current bus 40 to cause the wind driven generator 21 to be damaged can also be avoided.
The first voltage stabilizing circuit is respectively connected with the step-down conversion circuit 23, and the step-down conversion circuit 23 is used for performing step-down conversion on the stabilized direct-current voltage and outputting the wind power generation voltage subjected to the step-down conversion to the direct-current bus 40. The first synchronous rectification circuit in the buck converter circuit 23 is used to be turned on when current flows through the buck converter circuit 23 and turned off when no current flows through the buck converter circuit, so as to replace a conventional freewheeling diode to reduce loss.
In one embodiment, the combined energy supply circuit further includes a third voltage stabilizing circuit 80, wherein the third voltage stabilizing circuit 80 is disposed at a rear end of the solar power generation circuit 10 and the wind power generation circuit 20, and is connected to the dc bus 40, and is configured to perform voltage stabilizing processing on the solar power generation voltage output by the solar power generation circuit 10, the wind power generation voltage output by the wind power generation circuit 20, and the dc bus voltage corresponding to the dc bus 40, so as to stabilize the voltage input to two ends of the load circuit 60 through the dc bus 40, thereby improving the operation stability of the load circuit 60.
Further, the third voltage regulating circuit 80 is a fourth filter capacitor shown in FIG. 3C 4 Fourth filter capacitorC 4 The direct current bus is arranged at the rear end of the solar power generation circuit 10 and the wind power generation circuit 20, is connected with the direct current bus 40, and is used for filtering the solar power generation voltage output by the solar power generation circuit 10, the wind power generation voltage output by the wind power generation circuit 20 and the direct current bus voltage corresponding to the direct current bus 40 so as to stabilize the solar power generation voltage, the wind power generation voltage and the direct current bus voltage.
In one embodiment, as shown in FIG. 3, the full-bridge rectifier circuit 22 is the one in FIG. 3D birdge The first drain diode is shown in FIG. 3D w . The first voltage regulator circuit is the first filter capacitor in FIG. 3C 1 . The first synchronous rectification circuit is a second field effect transistor in figure 3Q 2 The buck converter circuit 23 includes the first field effect transistor in fig. 3Q 1 A first energy storage inductorＬ 1 And a second field effect transistorQ 2 . U in FIG. 3 w Indicating the output voltage of the wind generator 21.
Full-bridge rectification circuitD birdge Is connected to the wind power generator 21 for converting the alternating current generated by the wind power generator 21 into direct current. Full-bridge rectifier circuitD birdge The output end of the filter passes through a first filter capacitorC 1 Is connected to the step-down converter circuit 23.
First filter capacitorC 1 For full-bridge rectification circuitD birdge The output DC voltage is filtered to stabilize the DC voltage. First field effect transistorQ 1 And the wind power generation control signal is connected with the wind power generation control signal and used for switching on or switching off based on the high-low level change of the wind power generation control signal, wherein the wind power generation control signal is a pulse signal. Second field effectApplication pipeQ 2 For conducting when current flows in the step-down converter circuit 23 and for disconnecting when no current flows, so as to replace the conventional freewheeling diode to reduce the power loss.
In the first field effect transistorQ 1 Under the condition of conduction, the first energy storage inductorＬ 1 Charging based on the filtered DC voltage and in the first FETQ 1 In the case of turn-off, the solar power generation circuit 10 is based on the filtered dc voltage and the first energy storage inductorＬ 1 The stored energy is a fourth filter capacitorC 4 Charging and passing through a fourth filter capacitorC 4 The discharging transfers energy to the dc bus 40 at the rear end, and the dc power output from the dc bus 40 supplies power to the load circuit 60 at the rear end and charges the energy storage battery 50.
In one embodiment, as shown in fig. 2, the solar power generation circuit 10 includes a solar photovoltaic array 11 and a first boost converter circuit 12, wherein:
the solar photovoltaic array 11 is used for converting solar energy into direct current to be output. The first boost conversion circuit 12 is connected to the solar photovoltaic array 11, and is configured to convert a direct-current voltage output by the solar photovoltaic array 11 into a solar power generation voltage matched with a direct-current bus voltage.
Since the dc voltage output from the solar photovoltaic array 11 is relatively small and does not match the dc bus voltage, the first boost converter circuit 12 is required to convert the dc voltage output from the solar photovoltaic array 11 into the solar power generation voltage matching the dc bus voltage by using the boost conversion characteristic thereof. Since the load circuits 60 are connected to the dc bus 40 in a parallel-branched manner, the dc bus voltage corresponding to the dc bus 40 matches the load voltage of the load circuit 60.
It should be further noted that the solar photovoltaic array 11 is formed by connecting a plurality of solar photovoltaic cells in series, and since the distribution of sunlight is uniform, more solar photovoltaic cells can be arranged in the solar photovoltaic array 11 as much as possible to improve the output power of the solar photovoltaic array 11, so that the direct-current voltage output by the solar photovoltaic array 11 is higher.
In the combined energy power supply circuit provided by this embodiment, the first boost conversion circuit 12 is used for performing boost conversion on the dc voltage output by the solar photovoltaic array 11, so that the output solar power generation voltage is matched with the dc bus voltage, and because the dc bus voltage is consistent with the load voltage required by the load circuit 60, the dc bus voltage output by the solar power generation circuit 10 can be directly used by the load circuit 60 without passing through any voltage conversion circuit, thereby avoiding the defect of energy loss caused by the fact that the dc bus voltage is converted into the load voltage by using the voltage conversion circuit, and improving the energy utilization rate and the performance of the combined energy power supply circuit.
In one embodiment, the solar power generation circuit 10 further includes a second current-guiding diode and a second voltage-stabilizing circuit, and the first boost converter circuit 12 further includes a second synchronous rectification circuit, wherein:
the anode of the second current-guiding diode is connected with the solar photovoltaic array 11, and the cathode of the second current-guiding diode is connected with the second voltage stabilizing circuit. The second current-guiding diode is used for inputting the direct current output by the solar photovoltaic array 11 to the second voltage stabilizing circuit, so that the second voltage stabilizing circuit performs voltage stabilization on the direct current voltage output by the solar photovoltaic array 11, and the problem that the direct current output by the energy storage battery 50 flows back to the solar photovoltaic array 11 through the direct current bus 40 to cause damage to the solar photovoltaic array 11 can be avoided.
The second voltage stabilizing circuit is connected to the first boost converter circuit 12. The first boost converter circuit 12 is configured to boost and convert the regulated dc voltage, and output the solar power generation voltage to the dc bus 40. The second synchronous rectification circuit is used for conducting when current flows in the first boost converter circuit 12 and disconnecting when no current flows so as to replace a traditional freewheeling diode to reduce loss.
In one embodiment, as shown in FIG. 3, the second drain diode is that of FIG. 3D pv . The second voltage regulator circuit is the second filter capacitor in FIG. 3C 2 Second synchronous rectificationThe circuit is a third field effect transistor in fig. 3Q 3 The first boost converter circuit 12 includes the fourth fet in fig. 3Q 4 A second energy storage inductorＬ 2 And a third field effect transistorQ 3 . U in FIG. 3 pv Representing the dc voltage output by the solar photovoltaic array 11.
Second current-guiding diodeD pv The anode is connected with the solar photovoltaic array 11, and the cathode is connected with the second filter capacitorC 2 Is connected for inputting the direct current output by the solar photovoltaic array 11 to the second filter capacitorC 2 . Second filter capacitorC 2 The photovoltaic power generation device is used for filtering the direct current voltage output by the solar photovoltaic array 11 so as to stabilize the direct current voltage output by the solar photovoltaic array 11.
Fourth field effect transistorQ 4 And the solar power generation control signal is connected with the solar power generation control signal and used for switching on or off based on the high-low level change of the solar power generation control signal, wherein the solar power generation control signal is a pulse signal. Third field effect transistorQ 3 For conducting when current flows in the first boost converter circuit 12 and for disconnecting when no current flows, in place of the conventional freewheeling diode to reduce losses. Second energy storage inductorＬ 2 And a second filter capacitorC 2 Connected for charging or discharging based on the circuit state of the first boost converter circuit 12.
In the fourth field effect transistorQ 4 Under the condition of conduction, the second energy storage inductorＬ 2 Storing energy based on the filtered DC voltage, and providing energy to the fourth FETQ 4 In the case of shutdown, the solar power generation circuit 10 is based on the filtered dc voltage and the second energy storage inductorＬ 2 The stored energy is a fourth filter capacitorC 4 Charging and passing through a fourth filter capacitorC 4 The discharging transfers energy to the dc bus 40 at the rear end, and the dc power output from the dc bus 40 supplies power to the load circuit 60 at the rear end and charges the energy storage battery 50.
In one embodiment, as shown in fig. 2, the laser power generation circuit 30 includes a laser photovoltaic array 31 and a second boost converter circuit 32, wherein: the laser photovoltaic array 31 is used to convert laser energy into a direct current output.
The second boost converter circuit 32 is connected to the laser photovoltaic array 31, and is configured to convert the dc voltage output by the laser photovoltaic array 31 into a laser power generation voltage matched to the dc bus voltage.
Since the dc voltage output from the laser photovoltaic array 31 does not match the dc bus voltage, the second boost converter circuit 32 is required to convert the dc voltage output from the laser photovoltaic array 31 into a laser power generation voltage matching the dc bus voltage by using the characteristic of boost conversion.
It should be further noted that, the laser photovoltaic array 31 is formed by connecting a plurality of laser photovoltaic cells in series, and since the distribution of laser light is non-uniform, an excessive number of laser photovoltaic cells cannot be connected in series in the laser photovoltaic array 31, otherwise, a plurality of peaks may occur in an output characteristic curve of the laser photovoltaic array 31, which results in a defect of loss of output power of the laser photovoltaic array 31, and therefore, the number of laser photovoltaic cells connected in series in the laser photovoltaic array 31 is relatively small, so that a dc voltage output by the laser photovoltaic array 31 is relatively low.
According to the combined energy power supply circuit provided by the embodiment, the direct-current voltage output by the laser photovoltaic array 31 is subjected to boost conversion through the second boost conversion circuit 32, so that the laser power generation voltage matched with the direct-current bus voltage is output, and because the direct-current bus voltage corresponding to the direct-current bus 40 is consistent with the load voltage required by the load circuit 60, the direct-current bus voltage output by the laser power generation circuit 30 can be directly used by the load circuit 60 without any voltage conversion circuit, so that the defect of energy loss caused by the fact that the direct-current bus voltage is converted into the load voltage through the voltage conversion circuit can be avoided, and the energy utilization rate and the performance of the combined energy power supply circuit are improved.
In one embodiment, the laser power generation circuit 30 further includes a third current-guiding diode and a third voltage-stabilizing circuit, and the second boost converter circuit 32 further includes a third synchronous rectification circuit, wherein:
the anode of the third current-guiding diode is connected with the laser photovoltaic array 31, and the cathode of the third current-guiding diode is connected with the third voltage stabilizing circuit; the third current-guiding diode is used for inputting the direct current output by the laser photovoltaic array 31 to a third voltage-stabilizing circuit, so that the third voltage-stabilizing circuit can perform voltage-stabilizing treatment on the direct current voltage output by the laser photovoltaic array 31, and the problem that the direct current output by the energy storage battery 50 flows back to the laser photovoltaic array 31 through the direct current bus 40 to cause damage to the laser photovoltaic array 31 can be avoided.
The third voltage stabilizing circuit is connected to the second step-up converting circuit 32. The second boost converter circuit 32 is configured to boost-convert the regulated dc voltage, and output the laser power generation voltage to the dc bus 40. The third synchronous rectification circuit is used for conducting when current flows in the second boost conversion circuit 32, and disconnecting when no current flows, so as to replace the traditional freewheeling diode to reduce loss.
In one embodiment, as shown in FIG. 3, the third current-steering diode is that of FIG. 3D laser . The third voltage regulator circuit is the third filter capacitor in FIG. 3C 3 The third synchronous rectification circuit is the sixth field effect transistor in fig. 3Q 6 . The second boost converter circuit 32 includes the fifth fet in fig. 3Q 5 And the third energy storage inductorＬ 3 And a sixth field effect transistorQ 6 . U in FIG. 3 laser Which represents the dc voltage output by the laser photovoltaic array 31.
Third current-conducting diodeD laser Is connected to the laser photovoltaic array 31, a third current-guiding diodeD laser Cathode and third filter capacitorC 3 A connection for inputting the direct current generated by the laser photovoltaic array 31 to the third filter capacitorC 3 . Third filter capacitorC 3 The laser photovoltaic filter is used for filtering the direct current voltage output by the laser photovoltaic so as to stabilize the direct current voltage.
Fifth field effect transistorQ 5 Connected with the laser power generation control signal and used for controlling power generation based on laserAnd the high-low level change of the control signal is switched on or switched off, wherein the laser power generation control signal is a pulse signal. Sixth field effect transistorQ 6 And is adapted to be turned on when current flows in the second boost converter circuit 32 and turned off when no current flows, instead of a conventional freewheeling diode to reduce losses. Third energy storage inductorＬ 3 And a third filter capacitorC 3 And the connection is used for charging or discharging based on the laser photovoltaic voltage after the filtering treatment.
In the fifth field effect transistorQ 5 Under the condition of conduction, the third energy storage inductorＬ 3 For storing energy, and in the fifth field effect transistorQ 5 When the laser power generation circuit 30 is turned off, the laser power generation circuit is based on the filtered dc voltage and the third energy storage inductorＬ 3 The stored energy outputs a laser power generation voltage that matches the dc bus voltage corresponding to the dc bus 40.
In one embodiment, as shown in fig. 2, the combined energy supply circuit further comprises a super capacitor 70 arranged between the energy storage battery 50 and the load circuit 60.
The super capacitor 70 is connected to the load circuit 60 via the dc bus 40, and stores energy output from the solar power generation circuit 10, the wind power generation circuit 20, and the laser power generation circuit 30, and supplies power to the load circuit 60.
It should be noted that, because the power density of the electric energy generated by the laser power generation circuit 30 is high, the electric energy generated by the laser power generation circuit 30 needs to be rapidly stored and output for use, and the energy storage speed and the energy output speed of the energy storage battery 50 are relatively slow, so that the characteristics of rapid charging and discharging of the super capacitor 70 can be utilized to achieve rapid storage and output for use of the electric energy output by the laser power generation circuit 30.
Further, since the super capacitor 70 is disposed between the energy storage battery 50 and the load circuit 60, it is possible to rapidly store and output the electric energy output from the laser power generation circuit 30, and also to rapidly store and output the electric energy output from the solar power generation circuit 10 and the wind power generation circuit 20.
The combined energy power supply circuit provided by the embodiment realizes the rapid storage and output utilization of the output electric energy of the laser power generation circuit 30 by utilizing the rapid charging and discharging characteristic of the super capacitor 70, so that the normal operation of the load circuit 60 is maintained by the rapid discharging of the super capacitor 70 under the condition that the consumed electric energy of the load circuit 60 is supplemented and supplied by the laser power generation circuit 30, so that the load circuit 60 is in a stable working state, and therefore, the aerostat can smoothly complete the mission of staying empty during long-term navigation, and the stability and reliability of the combined energy power supply circuit are improved.
In one embodiment, the sixth field effect transistorQ 6 And the laser power supply control signal is connected with the laser power supply control signal and is used for conducting or switching off based on the laser power supply control signal. In the sixth field effect transistorQ 6 When the power supply is turned on, the laser power generation circuit 30 supplies power to the load circuit 60 and charges the energy storage battery 50 and the super capacitor 70. In the sixth field effect transistorQ 6 When the laser power generation circuit 30 is turned off, the laser power generation circuit is turned off, and power is not supplied to the outside or the laser power generation circuit is not charged.
The combined energy power supply circuit provided by the embodiment is provided by a sixth field effect transistorQ 6 The two functions of the laser power generation circuit 30, namely, the on-off control and the synchronous rectification, are realized, the circuit structure of the combined energy power supply circuit is optimized, the integration level of the combined energy power supply circuit is improved, and the power density of the combined energy power supply circuit is further improved.
In one embodiment, the combined energy power supply circuit further includes a first switch circuit 81, and the first switch circuit 81 is disposed at the rear end of the solar power generation circuit 10 and the wind power generation circuit 20, and is respectively connected to the dc bus 40 and the combined power supply control signal, and is configured to be turned on or off based on the combined power supply control signal to control the turning on or off of the solar power generation circuit 10 and the wind power generation circuit 20.
With the first switch circuit 81 closed, the load circuit 60 is supplied with power and the energy storage battery 50 and the super capacitor 70 are charged through the solar power generation circuit 10 and the wind power generation circuit 20. When the first switch circuit 81 is turned off, both the solar power generation circuit 10 and the wind power generation circuit 20 are turned off, and power is not supplied to or charged to the outside.
Further, the first switch circuit 81 is a field effect transistor. The first switch circuit 81 is the seventh FET in FIG. 3Q 7 。
In one embodiment, the combined energy supply circuit further includes a second switch circuit 82, and the second switch circuit 82 is respectively connected to the energy storage battery 50 and the power control signal, and is configured to be turned on or off based on the power control signal to control the energy storage battery 50 to be turned on or off.
When the second switch circuit 82 is closed, the storage battery 50 is charged by the solar power generation circuit 10, the wind power generation circuit 20, or the laser power generation circuit 30, or the load circuit 60 is supplied with power from the storage battery 50. With the second switching circuit 82 off, the energy storage battery 50 does not supply power to the outside world and is not charged.
Optionally, the second switching circuit 82 is a field effect transistor. Further, the second switch circuit 82 is an eighth fet in fig. 3Q 8 。
In one embodiment, the combined energy power supply circuit further comprises a voltage converter, and the load circuit 60 is a dc load, wherein: the dc bus 40 is connected to a dc load to drive the dc load based on the dc bus voltage output from the dc bus 40.
In summary, according to the combined energy power supply circuit applied to the aerostat, ac power generated by the wind power generator 21 is converted into stable dc power by the wind power generation circuit 20 through the full-bridge rectification circuit 22, and since the dc voltage output by the full-bridge rectification circuit 22 is not matched with the dc bus voltage of the dc bus 40, the dc voltage is converted into the wind power generation voltage matched with the dc bus voltage by the step-down conversion circuit 23 and is output. The solar power generation circuit 10 is connected in parallel with the wind power generation circuit 20, and is used for charging the energy storage battery 50 and supplying power to the load circuit 60. The laser power generation circuit 30 is used as a standby power supply circuit of the aerostat, and is used for charging the energy storage battery 50 and supplying power to the load circuit 60 to supply standby supply energy to the aerostat when the energy supplied by the solar power generation circuit 10 and the wind power generation circuit 20 is insufficient to meet the energy requirement of the aerostat.
In the seventh field effect transistorQ 7 And an eighth field effect transistorQ 8 When the solar power generation circuit 10 and the wind power generation circuit 20 are turned on, the energy storage battery 50 can be charged, and the load circuit 60 can be supplied with power through the dc bus. In the seventh field effect transistorQ 7 Conducting, eighth field effect transistorQ 8 When the solar power generation circuit 10 and the wind power generation circuit 20 are turned off, the solar power generation circuit and the wind power generation circuit are directly output to the direct current bus 40 to supply power to the load circuit 60.
In the sixth field effect transistorQ 6 And an eighth field effect transistorQ 8 When the power supply is turned on, the laser power generation circuit 30 can charge the energy storage battery 50 and supply power to the load circuit 60 through the direct current bus. In the sixth field effect transistorQ 6 Conducting, eighth field effect transistorQ 8 Under the condition of shutdown, the electric energy generated by the laser power generation circuit 30 is directly output to the direct current bus 40 to supply power to the load circuit 60, or is stored in the super capacitor 70 through the direct current bus 40, so that the electric energy generated by the laser power generation circuit 30 is rapidly stored, and is supplied to the load circuit 60 through the super capacitor 70.
The power supply control method of the present invention is described below with reference to fig. 4 to 9. As shown in fig. 4, the present invention provides a power supply control method, including:
step S1, wind power generation power, solar power generation power, load power, current voltage of an energy storage battery, current, maximum charging voltage and minimum discharging voltage are obtained.
Wherein, P w Representing wind power, P pv Representing solar power, P L Representing the load power, U B Indicating the current voltage, U, of the energy storage battery Bmax Represents the maximum charging voltage, U, of the energy storage battery Bmin Representing the minimum discharge voltage of the energy storage cell.
In particular, the seventh field effect transistor in fig. 3Q 7 And an eighth field effect transistorQ 8 Conducting sixth field effect transistorQ 6 Under the condition of turn-off, the solar power generation circuit and the wind power generation circuit are in an open state, the laser power generation circuit is in a closed state, and the power supply control circuit acquires wind power generation power, solar power generation power, load power, current voltage of the energy storage battery, maximum charging voltage and minimum discharging voltage.
And S2, calculating first total power based on the wind power generation power and the solar power generation power, and judging whether the first total power is greater than load power.
S3, determining a power supply control signal of the combined energy power supply circuit based on the current voltage and the maximum charging voltage of the energy storage battery under the condition that the first total power is greater than the load power; the power supply control signal acts on at least one of the solar power generation circuit, the wind power generation circuit, the laser power generation circuit and the energy storage battery.
It should be noted that, under the condition that the first total power is greater than the load power, the electric energy generated by the combined energy power supply circuit is greater than the energy consumed by the load circuit, and therefore, the current state of charge of the energy storage battery is determined based on the current voltage and the maximum charging voltage of the energy storage battery, so as to prevent the energy storage battery from being burned out due to overcharge, and while the safety and reliability of the combined energy power supply circuit are improved, the reasonable distribution and the efficient utilization of the electric energy generated by the power generation circuit are realized.
S4, determining a power supply control signal of the combined energy power supply circuit based on the current voltage and the minimum discharge voltage of the energy storage battery under the condition that the first total power is less than or equal to the load power; the combined energy power supply circuit is any one of the combined energy power supply circuits.
It should be noted that the first total power being less than or equal to the load power indicates that the electric energy generated by the solar power generation circuit and the wind power generation circuit cannot meet the power consumption requirement of the load circuit, and therefore, it is necessary to further determine whether the current voltage of the energy storage battery is less than the minimum discharge voltage to determine the supplement mode of the electric energy lack in the load, so that the energy storage battery can be prevented from being damaged due to over-discharge, and the stability, safety and reliability of the combined energy power supply circuit are improved.
In one embodiment, as shown in fig. 5, the step S3 includes steps S31 to S33, wherein: determining a power supply control signal of the combined energy power supply circuit based on the current voltage and the maximum charging voltage of the energy storage battery, comprising:
and step S31, judging whether the current voltage of the energy storage battery is greater than the maximum charging voltage.
And step S32, controlling the direct current bus voltage, the wind power generation voltage and the solar power generation voltage to be the maximum charging voltage under the condition that the current voltage of the energy storage battery is greater than the maximum charging voltage.
As shown in fig. 6, in the case that the first total power is greater than the load power and the current voltage of the energy storage battery is greater than the maximum charging voltage, i.e. P w +P pv ＞P L And U is B ＞U Bmax The energy storage battery is in a full-charge state, the electric energy generated by the combined energy power supply circuit is greater than the energy consumed by the load circuit, at the moment, in order to prevent the energy storage battery from overcharging, the solar power generation circuit and the wind power generation circuit need to be controlled to be in a constant-voltage output state, and the direct-current bus voltage, the wind power generation voltage and the solar power generation voltage are the maximum charging voltage of the energy storage battery, so that the full-charge state of the energy storage battery is maintained on the basis of meeting the power supply requirement of the load circuit and the safety of the energy storage battery, and the utilization rate of the electric energy generated by the combined energy power supply circuit is improved.
Further, by adjusting the first FET in FIG. 3Q 1 And a fourth field effect transistorQ 4 The duty ratios of the wind power generation circuit and the solar power generation circuit are respectively realized to realize that the wind power generation circuit and the solar power generation circuit are in a constant voltage output state.
And step S33, determining a power supply control signal of the combined energy power supply circuit based on the load power, the maximum charging power of the energy storage battery and the first total power under the condition that the current voltage of the energy storage battery is less than or equal to the maximum charging voltage.
As shown in fig. 6, in the case that the first total power is greater than the load power and the current voltage of the energy storage battery is less than or equal to the maximum charging voltage, i.e. P w +P pv ＞P L And U is B ≤U Bmax The energy storage battery is not in a full-power state, because the electric energy generated by the combined energy power supply circuit is larger than the energy consumed by the load circuit, the combined energy power supply circuit needs to charge the energy storage battery while supplying power to the load circuit, but because the energy storage battery has the maximum charging power, the power supply control signal of the combined energy power supply circuit needs to be determined based on the load power, the maximum charging power of the energy storage battery and the first total power, so that the current charging power of the energy storage battery is prevented from being burnt out due to overlarge power, and the safety and the reliability of the combined energy power supply circuit are improved.
In one embodiment, as shown in fig. 7, the step S33 includes steps S331 to S333, wherein:
step S331, calculating a second total power based on the load power and the maximum charging power, and determining whether the first total power is greater than the second total power. Wherein, P Bmax Representing the maximum charging power.
Step S332, determining a load current and a charging current based on the maximum charging power, the dc bus voltage, and the rated load power of the load circuit when the first total power is greater than the second total power.
Specifically, since the dc bus voltage is a constant value, the charging current of the energy storage battery is determined based on the maximum charging power and the dc bus voltage, and the load current of the load circuit is determined based on the dc bus voltage and the rated load power.
As shown in fig. 6, in the case that the first total power is greater than the load power, the current voltage of the energy storage battery is less than or equal to the maximum charging voltage, and the first total power is greater than the second total power, that is, P w +P pv ＞P L ，U B ≤U Bmax And P is w +P pv ＞P L +P Bmin The electric energy generated by the combined energy power supply circuit meets the energy consumed by the load circuit, and simultaneously, the combined energy power supply circuit is combinedThe extra power generated by the energy power supply circuit is greater than the maximum charging power which can be borne by the energy storage battery, so that the power generation power of the combined energy power supply circuit needs to be controlled, namely the maximum charging power of the energy storage battery is met, meanwhile, the power generation power of the combined energy power supply circuit is supplied according to the load power required by the load circuit, namely, the load current and the charging current are determined based on the maximum charging power, the direct-current bus voltage and the rated load power of the load circuit, and because the direct-current bus voltage is a constant value, the load power and the charging power are controlled by controlling the load current and the charging current.
Further, by adjusting the first FET in FIG. 3Q 1 And a fourth field effect transistorQ 4 The duty cycle of (a) enables control of the load current and the charging current.
And S333, controlling the solar power generation circuit to output the maximum photovoltaic power generation power and controlling the wind power generation circuit to output the maximum wind power generation power under the condition that the first total power is less than or equal to the second total power.
As shown in fig. 6, in the case that the first total power is greater than the load power, the current voltage of the energy storage battery is less than or equal to the maximum charging voltage, and the first total power is less than or equal to the second total power, that is, P w +P pv ＞P L ，U B ≤U Bmax And P is w +P pv ≤P L +P Bmin The generated power of the combined energy power supply circuit is less than the sum of the load consumed power and the maximum charging power of the energy storage battery, so that the combined energy power supply circuit needs to be controlled to output the maximum electric power, that is, the solar power generation circuit needs to be controlled to output the maximum photovoltaic power and the wind power generation circuit needs to be controlled to output the maximum wind power, so as to improve the utilization rate of the generated power of the combined energy power supply circuit.
Further, by adjusting the first FET in FIG. 3Q 1 And a fourth field effect transistorQ 4 The duty ratio of the solar power generation circuit is controlled to output the maximum photovoltaic power generation power and the wind power generation circuit is controlled to output the maximum wind power generation power.
In one embodiment, as shown in fig. 8, the step S4 includes steps S41 to S43, wherein:
and S41, judging whether the current voltage of the energy storage battery is greater than the minimum discharge voltage.
And S42, controlling the solar power generation circuit to output the maximum photovoltaic power generation power and controlling the wind power generation circuit to output the maximum wind power generation power under the condition that the current voltage of the energy storage battery is greater than the minimum discharge voltage, and controlling the energy storage battery to supply power to the load circuit.
As shown in fig. 6, in the case that the first total power is less than or equal to the load power and the current voltage of the energy storage battery is greater than the minimum discharge voltage, i.e. P w +P v ≤P L And U is B ＞U Bmin The electric quantity of the energy storage battery is sufficient, but the generated power of the combined energy power supply circuit cannot meet the power requirement of the load circuit, so that extra electric energy supplement needs to be carried out on the load circuit through the energy storage battery, and the maximum photovoltaic power generation power output by the solar power generation circuit and the maximum wind power generation power output by the wind power generation circuit need to be controlled, so that the energy of the energy storage battery is saved as far as possible.
And S43, controlling the solar power generation circuit to output the maximum photovoltaic power generation power, controlling the wind power generation circuit to output the maximum wind power generation power and controlling the laser power generation circuit to output the maximum laser power generation power under the condition that the current voltage of the energy storage battery is less than or equal to the minimum discharge voltage.
As shown in fig. 6, in the case that the first total power is less than or equal to the load power and the current voltage of the energy storage battery is less than or equal to the minimum discharge voltage, i.e. P w +P v ≤P L And U is B ≤U Bmin The generated power of the combined energy power supply circuit cannot meet the power requirement of the load circuit, and the current voltage of the energy storage battery is smaller than the minimum discharge standard, so that the laser power generation circuit is required to be controlled to output the maximum laser generated power to supplement the additional electric energy to the load circuit and charge the energy storage battery, and the energy storage battery is prevented from being chargedThe power supply is stopped by overdischarge, and the stability and the reliability of the combined energy power supply circuit are improved.
In one embodiment, as shown in fig. 9, the power supply control method of the present embodiment further includes steps S5 to S8, where:
and S5, acquiring the output current and the output voltage of the power generation circuit to be tracked, wherein the power generation circuit to be tracked comprises at least one of a solar power generation circuit, a wind power generation circuit and a laser power generation circuit.
And S6, acquiring an initial control signal based on the output current, the output voltage and the maximum power tracking algorithm.
And S7, acquiring current control parameters corresponding to the power generation circuit to be tracked, and adjusting the initial control signal based on the current control parameters to obtain a target control signal. The current control parameter is a power supply control signal in any one of the power supply control methods.
And S8, controlling the to-be-tracked power generation circuit to output the maximum power generation power based on the target control signal.
Further, the current generating power of the generating circuit to be tracked is obtained, and whether the current generating power reaches the maximum generating power of the generating circuit to be tracked is judged. And under the condition that the current generating power does not reach the maximum generating power of the generating circuit to be tracked, the step S6 to the step S8 are repeatedly executed until whether the current generating power of the generating circuit to be tracked reaches the maximum generating power of the generating circuit to be tracked.
Further, it is determined whether the current illumination intensity or temperature is changed, and the above steps S6 to S8 are repeatedly performed when the current illumination intensity or temperature is changed. Further, it is determined whether or not the rated load power of the load circuit has changed, and when the rated load power of the load circuit has changed, the above-described steps S7 to S8 are repeatedly executed.
As shown in fig. 10, the present invention provides a power supply control circuit including: power supply controller, signal conditioning circuit 1, signal conditioning circuit 2, signal conditioning circuit 3, pulse width modulation PWM controller, proportional-integral-derivative PID closed loop feedback regulating circuit and MOSFET drive circuit (Metal-Oxide-Semiconductor Field-Effect Transistor), wherein: the power supply controller is used for executing the power supply control method provided by any one of the above embodiments.
The signal conditioning circuit 1 is connected with the solar power generation circuit and the power supply controller, and is used for conditioning a direct current voltage sampling signal and a direct current sampling signal output by the solar power generation circuit and transmitting a conditioned first analog signal to the power supply controller.
The signal conditioning circuit 2 is connected with the wind power generation circuit and the power supply controller, and is used for conditioning the direct current voltage sampling signal and the direct current sampling signal output by the wind power generation circuit and transmitting the conditioned second analog signal to the power supply controller.
The signal conditioning circuit 3 is connected with the laser power generation circuit and the power supply controller, and is used for conditioning the direct current voltage sampling signal and the direct current sampling signal output by the laser power generation circuit and transmitting the conditioned third analog signal to the power supply controller. The signal conditioning refers to filtering and amplifying the voltage and current signals sampled by the voltage and current sensor. The signal conditioning in the digital input channel mainly comprises jitter elimination, filtering, protection, level conversion, isolation and the like.
The Power supply controller is configured to convert the received first analog signal, second analog signal, and third analog signal into a first digital signal, a second digital signal, and a third digital signal, and input the first digital signal, the second digital signal, and the third digital signal to an MPPT (Maximum Power Point Tracking) control algorithm to obtain a first duty ratio corresponding to the first digital signal, a second duty ratio corresponding to the second digital signal, and a third duty ratio corresponding to the third digital signal.
The power supply controller is connected with the PWM controller, and is further configured to generate an initial PWM (Pulse Width Modulation) signal based on the first duty ratio, the second duty ratio, and the third duty ratio, and input the initial PWM signal into the PWM controller.
And the PWM controller is respectively connected with the PID closed-loop feedback regulating circuit and the MOSFET drive circuit and is used for obtaining a target PWM signal based on the initial PWM signal transmitted by the power supply controller and the current control parameter transmitted by the PID closed-loop feedback regulating circuit and inputting the target PWM signal to the MOSFET drive circuit.
And the MOSFET driving circuit is used for performing signal amplification processing on the basis of the target PWM signal and outputting a first control signal P1, a second control signal P2 and a third control signal P3. The current control parameter is a power supply control signal in any one of the power supply control methods.
Wherein the first control signal P1 is the above-mentioned combined power supply control signal for controlling the first FET in FIG. 3Q 1 The control conversion and the maximum power tracking of the electric energy output by the wind power generation circuit are realized. The second control signal P2 is the above-mentioned laser power supply control signal for controlling the fourth FET in FIG. 3Q 4 The solar power generation circuit is switched on or switched off to realize control conversion and maximum power tracking of the output electric energy of the solar power generation circuit. The third control signal P3 is the power control signal mentioned above for controlling the fifth FET in FIG. 3Q 5 The power supply is switched on or switched off to realize the control conversion and the maximum power tracking of the output electric energy of the laser power generation circuit.
In addition, the power supply controller sends a power supply control signal to act on a field effect transistor in the combined energy power supply circuit by combining a combined energy power supply system power supply control method according to the solar power generation circuit, the wind power generation circuit, the load power, the laser power generation circuit power, the charge state of the energy storage battery, the maximum charging voltage, the power and the minimum discharging voltage of the energy storage batteryQ 6 、Q 7 AndQ 8 . Wherein the content of the first and second substances,Q 6 is used for controlling whether the laser power generation circuit is started or not,Q 7 is used for controlling the starting or not of the wind power generation circuit and the solar power supply circuit,Q 8 the control circuit is used for controlling the conduction and the disconnection of a charging and discharging circuit of the energy storage battery.
The power supply control circuit provided by the invention mainly uses the combined power supply subsystem formed by the solar power generation circuit and the wind power generation circuit, and uses the laser power generation circuit as energy supplement to realize energy supply to the load circuit, so that the energy supply requirement of the long-endurance and long-endurance parking task of the aerostat and the power requirement of the aerostat carrying the load are met. Through reasonable distribution and scheduling of the energy storage battery of the combined energy system, the total generated energy of the combined energy power supply circuit, the electric energy consumption of the load circuit and the charge state and the charge and discharge performance of the energy storage battery are comprehensively considered, and the electric energy requirement of the system is ensured while the overcharge and the overdischarge of the energy storage battery are avoided.
In addition, because the relationship between the power generation power of wind power generation and solar photovoltaic power generation and weather conditions is very close, under the condition that the wind speed or the light intensity changes, the output characteristic of the combined energy power supply circuit also changes, and the power supply controller is required to rerun the MPPT control algorithm so as to adjust the power supply control strategy, thereby ensuring that the combined energy power supply circuit continuously meets the energy supply requirement of the aerostat for executing a long-endurance parking task and the power requirement of the aerostat for carrying a load, and improving the power supply stability of the combined energy power supply circuit. Under the condition that the power demand of the load circuit is large, the solar power generation circuit and the wind power generation circuit are controlled to output the maximum power, so that the utilization efficiency of the system to the energy is improved.
In addition, the energy output by the solar power generation circuit and the wind power generation circuit is controlled by the power supply control circuit to be matched with the energy currently required by the load circuit and the charging and discharging state of the energy storage battery, so that the power balance of the combined energy power supply circuit and the safe power supply of the aerostat are ensured.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (5)

1. A power supply control method of a combined energy power supply circuit applied to an aerostat is characterized by comprising the following steps:
acquiring wind power generation power, solar power generation power, load power, current voltage of an energy storage battery, current, maximum charging voltage and minimum discharging voltage;
calculating first total power based on the wind power generation power and the solar power generation power, and judging whether the first total power is larger than the load power;
determining a power supply control signal of a combined energy power supply circuit based on the current voltage and the maximum charging voltage of the energy storage battery under the condition that the first total power is greater than the load power; the power supply control signal acts on at least one of the solar power generation circuit, the wind power generation circuit, the laser power generation circuit and the energy storage battery;
wherein the determining a power supply control signal of a combined energy power supply circuit based on the current voltage and the maximum charging voltage of the energy storage battery comprises: judging whether the current voltage of the energy storage battery is greater than the maximum charging voltage or not; under the condition that the current voltage of the energy storage battery is greater than the maximum charging voltage, controlling the direct-current bus voltage, the wind power generation voltage and the solar power generation voltage to be the maximum charging voltage; under the condition that the current voltage of the energy storage battery is smaller than or equal to the maximum charging voltage, determining a power supply control signal of the combined energy power supply circuit based on the load power, the maximum charging power of the energy storage battery and the first total power;
under the condition that the first total power is smaller than or equal to the load power, determining a power supply control signal of a combined energy power supply circuit based on the current voltage and the minimum discharge voltage of the energy storage battery;
wherein the determining a power supply control signal of a combined energy power supply circuit based on the current voltage and the minimum discharge voltage of the energy storage battery comprises: judging whether the current voltage of the energy storage battery is greater than the minimum discharge voltage or not; under the condition that the current voltage of the energy storage battery is greater than the minimum discharge voltage, controlling the solar power generation circuit to output the maximum photovoltaic power generation power and controlling the wind power generation circuit to output the maximum wind power generation power, and controlling the energy storage battery to supply power to the load circuit; under the condition that the current voltage of the energy storage battery is less than or equal to the minimum discharge voltage, controlling the solar power generation circuit to output the maximum photovoltaic power generation power, controlling the wind power generation circuit to output the maximum wind power generation power and controlling the laser power generation circuit to output the maximum laser power generation power;
the combined energy power supply circuit applied to the aerostat comprises: solar energy power generation circuit, wind power generation circuit, laser power generation circuit, direct current bus, energy storage battery and load circuit, wherein:
the solar power generation circuit, the wind power generation circuit and the laser power generation circuit are connected with the energy storage battery and the load circuit through the direct current bus and are used for supplying power to the load circuit and charging the energy storage battery;
the energy storage battery is connected with the load circuit through the direct current bus and used for supplying power to the load circuit;
the laser power generation circuit comprises a laser photovoltaic array and a second boost conversion circuit, wherein: the laser photovoltaic array is used for converting laser energy into direct current and outputting the direct current; the second boost conversion circuit is connected with the laser photovoltaic array and used for converting the direct-current voltage output by the laser photovoltaic array into laser power generation voltage matched with direct-current bus voltage;
further comprising: a super capacitor disposed between the energy storage battery and the load circuit; the super capacitor is connected with the load circuit through the direct current bus and used for storing energy output by the solar power generation circuit, the wind power generation circuit and the laser power generation circuit and supplying power to the load circuit.
2. The power supply control method applied to the combined energy power supply circuit of the aerostat as claimed in claim 1, wherein said determining the power supply control signal of the combined energy power supply circuit based on the load power, the maximum charging power of the energy storage battery and the first total power comprises:
calculating a second total power based on the load power and the maximum charging power, and judging whether the first total power is greater than the second total power;
determining a load current and a charging current based on a maximum charging power, a direct current bus voltage and a rated load power of a load circuit in the case that the first total power is greater than the second total power;
and under the condition that the first total power is less than or equal to the second total power, controlling the solar power generation circuit to output the maximum photovoltaic power generation power and controlling the wind power generation circuit to output the maximum wind power generation power.
3. The power supply control method applied to the combined energy power supply circuit of the aerostat as claimed in claim 1, wherein the method further comprises:
acquiring output current and output voltage of a power generation circuit to be tracked, wherein the power generation circuit to be tracked comprises at least one of a solar power generation circuit, a wind power generation circuit and a laser power generation circuit;
acquiring an initial control signal based on the output current, the output voltage and a maximum power tracking algorithm;
acquiring current control parameters corresponding to a power generation circuit to be tracked, and adjusting the initial control signal based on the current control parameters to obtain a target control signal;
and controlling the generating circuit to be tracked to output the maximum generating power based on the target control signal.
4. The power supply control method of the combined energy power supply circuit applied to the aerostat, according to claim 1, wherein the wind power generation circuit comprises a wind power generator, a full-bridge rectification circuit and a step-down conversion circuit, wherein:
the full-bridge rectifying circuit is connected with the wind driven generator and is used for converting alternating current generated by the wind driven generator into direct current;
the voltage reduction conversion circuit is connected with the full-bridge rectification circuit and used for converting the direct-current voltage output by the full-bridge rectification circuit into wind power generation voltage matched with direct-current bus voltage, and the direct-current bus voltage represents the voltage on the direct-current bus.
5. The power supply control method of the combined energy power supply circuit applied to the aerostat, according to claim 1, wherein the solar power generation circuit comprises a solar photovoltaic array and a first boost converter circuit, wherein:
the solar photovoltaic array is used for converting solar energy into direct current and outputting the direct current;
the first boost conversion circuit is connected with the solar photovoltaic array and used for converting the direct-current voltage output by the solar photovoltaic array into solar power generation voltage matched with direct-current bus voltage.
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