Power distribution network unmanned aerial vehicle wireless energy supply system

Abstract

The invention belongs to the technical field of power distribution network unmanned aerial vehicle matching systems, and particularly relates to a power distribution network unmanned aerial vehicle wireless energy supply system. Comprising a fixed side assembly and a movable side assembly. The fixed side assembly is fixed on a power distribution network line and comprises an induction energy taking device, a protection control device and a coupling resonance energy supply device; the movable side assembly is installed on the unmanned aerial vehicle and comprises a coupling resonance receiving device, a resonance compensation structure and an unmanned aerial vehicle energy storage device. The wireless energy supply system for the unmanned aerial vehicle of the power distribution network is mainly used for constructing a scheme which can be used for realizing online power taking of the unmanned aerial vehicle and realizing wireless power transmission optimization based on a current power supply network of the power distribution network, and is used for providing a safe and efficient endurance energy supply scheme for the unmanned aerial vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of distribution network UAV supporting systems, and in particular relates to a distribution network UAV wireless energy supply system. Background Art

[0002] Distribution network drones are an efficient and convenient means of inspection and monitoring. Drones can more intuitively obtain information on the status of various structures of distribution network lines without being restricted by spatial regions. At the same time, distribution network inspection tasks often involve larger inspection areas and longer inspection routes, which require higher endurance of drones. With the addition of various online monitoring and collection equipment, the demand for endurance and charging of drones during inspection operations continues to increase. The current solution is mainly to configure a dedicated drone operation platform and meet the endurance requirements through rapid replacement of automated battery packs. Summary of the invention

[0003] The purpose of the present invention is to provide a wireless power supply system for drones in a distribution network that is independent of a dedicated platform and is mainly used to achieve online charging and endurance of drones.

[0004] To achieve the above purpose, the present invention adopts the following technical solution.

[0005] A wireless energy supply system for a distribution network drone, comprising a fixed side component and a movable side component;

[0006] The fixed side components are fixed on the distribution network line, including inductive energy acquisition devices, protection and control devices, and coupled resonance energy supply devices; the movable side components are installed on the drone, including coupled resonance receiving devices, resonance compensation structures, and drone energy storage devices;

[0007] The inductive energy taking device comprises a primary side inductive power taking winding and a secondary side energy supply winding;

[0008] The inductive power winding on the primary side includes a silicon steel core with an air gap, which is surrounded by two semicircular silicon steel cores, and the air gap size is δ; the inner diameter of the core is a, the outer diameter is b, the height is h, and the cross-sectional area of ​​the core is S eq ; To meet the condition that the magnetic field of the energy harvesting device has no edge effect:

[0009] To ensure that the energy supply side has sufficient output power under low current of the distribution network and that the core does not overheat when the receiving side is open-circuited, in this application, the air gap δ satisfies:

[0010]

[0011] I 1.max is the maximum current on the primary side, I m.min is the minimum excitation current, E j.minis the minimum induced voltage required on the receiving side, γ is the saturation coefficient, f is the excitation current frequency, N 1 is the number of turns of the primary coil, N 2 is the number of turns of the secondary coil, μ 0 is the magnetic constant;

[0012] Secondary side power supply winding optimization: To ensure that the active side components obtain maximum power, the internal resistance of the secondary side power supply winding should be less than or equal to the active side load resistance. R L is the equivalent resistance of the active side component, ρ 2 is the secondary coil resistivity, S 2 is the cross-sectional area of ​​the secondary coil;

[0013] To ensure that the secondary side can still stably supply energy to complete the charging of the drone battery under the lowest current measured on one side, it is necessary to ensure that the minimum output voltage of the secondary side is not too low and needs to meet N 2 I m.min μ 0 hln(b / a)≥0.02E bat ; E bat Charging voltage for drone battery;

[0014] As a preferred solution, for the primary side line, the inner diameter a of the core is 100 mm, the outer diameter b is 180 mm, the height h is 80 mm, the air gap size δ is 10 mm, and the number of turns of the secondary side coil is N. 2 60~80;

[0015] The protection control device includes a line current sensor, a digital comparator, and a controllable turn-off diode;

[0016] The line voltage sensor obtains the line current value e 1 , the digital comparator converts the line current value e 1 The preset standard current value of the line current is 0 For comparison, the standard current value e 0 It refers to the line current value that enables the secondary side to obtain power; the digital comparator compares e 1 and e 0 size and output high and low levels, if e 1 <e 0 , the output is high level, the controllable turn-off diode controls the number of turns of the secondary coil to the number of turns of the coil when the maximum power is obtained. If e 1 >e 0 , then the output is low level, and the controllable turn-off diode controls the number of turns of the secondary coil to the number of turns of the coil that meets the minimum power requirement of the receiving side;

[0017] The coupled resonant energy supply device is based on a voltage source input series resonant topology to form a mutual inductance power transmission system with the receiving side;

[0018] In order to avoid frequency splitting during transmission, the mutual inductance coefficient M of the coupled mutual inductance structure formed by the functional side and the receiving side must satisfy

[0019] The mutual inductance coefficient of the M coupled mutual inductance structure, where R 2 is the secondary side internal resistance, L is the coil self-inductance, and C is the matching capacitor;

[0020] The resonant compensation structure includes an F-LCCL single-sided resonant compensation network and a full-bridge rectifier; the F-LCCL single-sided resonant compensation network controls the voltage level on the receiving side, improves the transmission efficiency of electric energy from the receiving side to the UAV energy storage device, reduces system losses, and compensates for reactive power consumption. The full-bridge rectifier completes rectification and filtering to ensure that electric energy can be continuously and stably input into the UAV energy storage device.

[0021] A further improvement or preferred implementation of the above-mentioned wireless power supply system for UAVs in the power distribution network, in particular, the comparator is based on e 1 and e 0 The size and output of different levels of electrical level, according to the evaluation level, the controllable turn-off diode controls the secondary side coil turns and the middle coil turns between the aforementioned coil turns.

[0022] A further improvement or preferred implementation of the aforementioned distribution network drone wireless power supply system is based on the voltage source input series resonance topology structure and the mutual inductance power transmission system on the receiving side, and a relay coil is set between the coupling coils to improve the efficiency of long-distance wireless power supply.

[0023] A further improvement or preferred implementation of the aforementioned distribution network drone wireless power supply system, the inductive energy acquisition device also includes an optocoupler drive circuit power module composed of a varistor, an energy storage capacitor, a common-mode inductor and a low-pass filter; when the primary side output voltage is too low, the secondary side is charged by the energy storage capacitor, and when the primary side output voltage is too large, the secondary side controls the voltage threshold through the varistor to increase the secondary side current. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the wireless energy supply system for UAVs in the distribution network. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with specific embodiments.

[0026] The present application discloses a wireless power supply system for UAVs in a distribution network, which is mainly used to construct a solution based on the current power supply network of the distribution network that can be used to realize online power supply for UAVs and optimize wireless power transmission, so as to provide UAVs with a safe and efficient endurance power supply solution.

[0027] like Figure 1 As shown, the wireless energy supply system for the distribution network drone of the present application mainly includes a fixed side component arranged on one side of the high-voltage power supply network of the distribution network, and a movable side component arranged on the drone body or in cooperation with the drone parking platform;

[0028] The fixed side components are fixed on the distribution network line, and are mainly used for mutual induction power supply through the high-voltage distribution network, including induction power supply device, protection control device, and coupled resonance power supply device;

[0029] The active side components are installed on the UAV, including a coupled resonant receiving device, a resonant compensation structure, and a UAV energy storage device; some of the structures, such as the coupled resonant receiving device and the resonant compensation structure, can be configured on structures such as UAV charging stations and parking stations set up on distribution network towers to achieve lightweight UAVs and equipment, improve the endurance of UAVs, and realize power transmission through quick plug-in devices or contact switch lights.

[0030] The inductive energy taking device includes a primary side inductive power taking winding and a secondary side energy supply winding;

[0031] The inductive power winding on the primary side includes a silicon steel core with an air gap, which is surrounded by two semicircular silicon steel cores, and the air gap size is δ; the inner diameter of the core is a, the outer diameter is b, the height is h, and the cross-sectional area of ​​the core is S eq ; To meet the condition that the magnetic field of the energy harvesting device has no edge effect:

[0032] To ensure that the energy supply side has sufficient output power under low current of the distribution network and that the core does not overheat when the receiving side is open-circuited, in this application, the air gap δ satisfies:

[0033]

[0034] I 1.max is the maximum current on the primary side, I m.min is the minimum excitation current, E j.min is the minimum induced voltage required on the receiving side, γ is the saturation coefficient, f is the excitation current frequency, N 1 is the number of turns of the primary coil, N 2 is the number of turns of the secondary coil, μ 0 is the magnetic constant;

[0035] Secondary side power supply winding optimization: To ensure that the active side components obtain maximum power, the internal resistance of the secondary side power supply winding should be less than or equal to the active side load resistance. R L is the equivalent resistance of the active side component, ρ 2 is the secondary coil resistivity, S 2 is the cross-sectional area of ​​the secondary coil;

[0036] In order to ensure that the secondary side can still stably supply energy to complete the charging of the drone battery when the minimum current is measured on one side, it is necessary to ensure that the minimum output voltage of the secondary side is not too low and N 2 I m.min μ 0 hln(b / a)≥0.02E bat ; E bat Charging voltage for drone battery;

[0037] As a preferred solution, for the primary side line, the inner diameter a of the core is 100 mm, the outer diameter b is 180 mm, the height h is 80 mm, the air gap size δ is 10 mm, and the number of turns of the secondary side coil is N. 2 60~80;

[0038] The protection control device includes a line current sensor, a digital comparator, and a controllable turn-off diode;

[0039] The line voltage sensor obtains the line current value e 1 , the digital comparator converts the line current value e 1 The preset standard current value of the line current is 0 For comparison, the standard current value e 0 It refers to the line current value that enables the secondary side to obtain power; the digital comparator compares e 1 and e 0 size and output high and low levels, if e 1 <e 0 , the output is high level, the controllable turn-off diode controls the number of turns of the secondary coil to the number of turns of the coil when the maximum power is obtained. If e 1 >e 0 , then the output is low level, and the controllable turn-off diode controls the number of turns of the secondary coil to the number of turns of the coil that meets the minimum power requirement of the receiving side;

[0040] The coupled resonant energy supply device is based on a voltage source input series resonant topology to form a mutual inductance power transmission system with the receiving side;

[0041] In order to avoid frequency splitting during transmission, the mutual inductance coefficient M of the coupled mutual inductance structure formed by the functional side and the receiving side must satisfy

[0042] M is the mutual inductance coefficient of the coupled mutual inductance structure, where R 2 is the secondary side internal resistance, L is the coil self-inductance, and C is the matching capacitor;

[0043] It includes a coupled resonance receiving device, a resonance compensation structure, and an unmanned aerial vehicle energy storage device;

[0044] The resonant compensation structure includes an F-LCCL single-sided resonant compensation network and a full-bridge rectifier; the F-LCCL single-sided resonant compensation network controls the voltage level on the receiving side, improves the transmission efficiency of electric energy from the receiving side to the UAV energy storage device, reduces system losses, and compensates for reactive power consumption. The full-bridge rectifier completes rectification and filtering to ensure that electric energy can be continuously and stably input into the UAV energy storage device.

[0045] The comparator is based on e 1 and e 0 The size and output of different levels of electrical level, according to the evaluation level, the controllable turn-off diode controls the secondary side coil turns and the middle coil turns between the aforementioned coil turns.

[0046] Based on the mutual inductance power transmission system composed of a voltage source input series resonance topology structure and a receiving side, a relay coil is set between the coupling coils to improve the efficiency of long-distance wireless power supply.

[0047] The inductive energy harvesting device also includes an optocoupler drive circuit power module composed of a varistor, an energy storage capacitor, a common-mode inductor and a low-pass filter; when the primary side output voltage is too low, the secondary side is charged by the energy storage capacitor; when the primary side output voltage is too large, the secondary side controls the voltage threshold through the varistor to increase the secondary side current.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A wireless energy supply system for UAVs in a distribution network, characterized in that: It includes a fixed side component and a movable side component; The fixed side components are fixed on the distribution network line, including inductive energy acquisition devices, protection and control devices, and coupled resonance energy supply devices; the movable side components are installed on the drone, including coupled resonance receiving devices, resonance compensation structures, and drone energy storage devices; The inductive energy taking device comprises a primary side inductive power taking winding and a secondary side energy supply winding; The inductive power winding on the primary side includes a silicon steel core with an air gap, which is surrounded by two semicircular silicon steel cores, and the air gap size is δ; the inner diameter of the core is a, the outer diameter is b, the height is h, and the cross-sectional area of ​​the core is S eq ; To meet the condition that the magnetic field of the energy harvesting device has no edge effect: To ensure that the energy supply side has sufficient output power under low current of the distribution network and that the core does not overheat when the receiving side is open-circuited, in this application, the air gap δ satisfies: I 1.max is the maximum current on the primary side, I m.min is the minimum excitation current, E j.min is the minimum induced voltage required on the receiving side, γ is the saturation coefficient, f is the excitation current frequency, N1 is the number of turns of the primary coil, N2 is the number of turns of the secondary coil, and μ0 is the magnetic constant; Secondary side power supply winding optimization: To ensure that the active side components obtain maximum power, the internal resistance of the secondary side power supply winding should be less than or equal to the active side load resistance. R L is the equivalent resistance of the active side component, ρ2 is the resistivity of the secondary side coil, and S2 is the cross-sectional area of ​​the secondary side coil; To ensure that the secondary side can still provide stable energy to charge the drone battery when the minimum current is measured on one side, the minimum output voltage of the secondary side must not be too low and must meet N2I m.min μ0h ln(b / a)≥0.02E bat ; E bat Charging voltage for drone battery; As a preferred solution, for the primary side line, the inner diameter a of the core is 100 mm, the outer diameter b is 180 mm, the height h is 80 mm, the air gap size δ is 10 mm, and the number of turns N2 of the secondary side coil is 60 to 80; The protection control device includes a line current sensor, a digital comparator, and a controllable turn-off diode; The line voltage sensor obtains the line current value e1, and the digital comparator compares the line current value e1 with the preset standard current value e0 of the line current. The standard current value e0 refers to the line current value that enables the secondary side to obtain power. The digital comparator compares the size of e1 and e0 and outputs high and low levels. If e1<e0, it outputs a high level, and the controllable turn-off diode controls the number of turns of the secondary side coil to the number of turns of the coil when the maximum power is obtained. If e1>e0, it outputs a low level, and the controllable turn-off diode controls the number of turns of the secondary side coil to the number of turns of the coil when the minimum power requirement of the receiving side is met. The coupled resonant energy supply device is based on a voltage source input series resonant topology to form a mutual inductance power transmission system with the receiving side; In order to avoid frequency splitting during transmission, the mutual inductance coefficient M of the coupled mutual inductance structure formed by the functional side and the receiving side must satisfy Where M is the mutual inductance coefficient of the coupled mutual inductance structure, R2 is the secondary side internal resistance, L is the coil self-inductance, and C is the matching capacitor; The resonant compensation structure includes an F-LCCL single-side resonant compensation network and a full-bridge rectifier; The F-LCCL single-sided resonant compensation network controls the voltage level on the receiving side, improves the transmission efficiency of the receiving side electric energy to the UAV energy storage device, reduces system losses, compensates for reactive power consumption, and the full-bridge rectifier completes rectification and filtering to ensure that electric energy can be continuously and stably input into the UAV energy storage device.

2. The wireless energy supply system for UAVs in the power distribution network according to claim 1, characterized in that: The comparator outputs different levels of electrical levels according to the size of e1 and e0. According to the evaluation level, the controllable turn-off diode controls the number of turns of the secondary side coil and the number of turns of the middle coil between the aforementioned coil turns.

3. The wireless energy supply system for UAVs in the power distribution network according to claim 1, characterized in that: Based on the mutual inductance power transmission system composed of a voltage source input series resonance topology structure and a receiving side, a relay coil is set between the coupling coils to improve the efficiency of long-distance wireless power supply.

4. The wireless energy supply system for UAVs in the power distribution network according to claim 1, characterized in that: The inductive energy harvesting device also includes an optocoupler drive circuit power supply module composed of a varistor, an energy storage capacitor, a common-mode inductor and a low-pass filter; when the primary side output voltage is too low, the secondary side is charged by the energy storage capacitor; when the primary side output voltage is too large, the secondary side controls the voltage threshold through the varistor to increase the secondary side current.

Images