Aircraft alternating current distribution network power supply conversion circuit based on prediction and operation method thereof

Abstract

The invention discloses a prediction-based airplane alternating current distribution network power supply conversion circuit and an operation method thereof, and relates to the technical field of aviation power distribution. The circuit comprises a main channel alternating-current contactor, a main channel alternating-current conversion contactor, a standby channel alternating-current contactor, a standby channel alternating-current conversion contactor, a ground channel alternating-current contactor, a main channel alternating-current relay, a main channel alternating-current conversion relay, a standby channel alternating-current relay, a standby channel alternating-current conversion relay and a ground channel alternating-current relay. And a hardware interlocking network is formed by the 28V bus bars, so that reliable conversion between the ground channel and the main and standby channels on the machine is reliably ensured, parallel connection of redundant power supply channels is effectively prevented, the power supply conversion time between the ground channel and the main and standby channels is effectively shortened, and the safety and reliability of the system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aviation power distribution systems, and in particular relates to a prediction-based aircraft AC power distribution network power supply conversion circuit and an operation method thereof. Background Art

[0002] In the field of aviation power distribution systems, with the substantial increase in airborne electrical equipment, the status and role of aircraft power distribution systems have become increasingly important. The power distribution system of an aircraft must not only provide sufficient capacity, but also ensure high reliability and real-time performance of power supply. CN116191645A "A priority-based aircraft dual-redundancy power supply anti-parallel circuit" CN113765211A "A method for uninterrupted power supply of a DC emergency busbar in an aviation power distribution system" and other documents focus on redundant power supply conversion, power supply architecture, conversion principle, circuit function, etc. However, the AC busbar where the AC power equipment is located can be powered on and checked using an AC ground power supply on the ground, and there are also working scenarios where the AC generator on board is used for power supply. Therefore, there is a process of AC power supply being transferred from the ground to the aircraft. At the same time, the control method for AC power supply conversion often cannot be switched back to the ground channel power supply after switching to the aircraft. At the same time, the control method for AC power supply conversion generally adopts controller control, and the controller often uses the auxiliary contact state of the AC contactor as the judgment condition for power supply conversion. As the contactor is used for a long time, the power supply conversion time will increase accordingly, affecting the actual use on the aircraft. Summary of the invention

[0003] In order to solve the deficiencies in the above-mentioned prior art, the present invention provides a prediction-based aircraft AC power distribution network power supply conversion circuit and operation method. When there is no signal cross-linking among the first controller, the second controller and the third controller, the first controller, the second controller, the third controller and a hardware interlocking network composed of a contactor, a coil control circuit of a relay and normally closed / normally open contacts connected in series can work together to reliably ensure reliable conversion between the ground channel and the main and standby channels on the aircraft, and the AC power supply of the main channel on the aircraft is higher than that of the standby channel, which effectively prevents redundant power supply channels from being connected in parallel, thereby improving the safety and reliability of the system.

[0004] In view of this, according to one aspect of an embodiment of the present invention, there is provided a prediction-based aircraft AC power distribution network power supply conversion circuit, comprising: a main channel AC contactor 1, a main channel AC conversion contactor 2, a standby channel AC contactor 3, a standby channel AC conversion contactor 4, a ground channel AC contactor 5, a main channel AC relay 6, a main channel AC conversion relay 7, a standby channel AC relay 8, a standby channel AC conversion relay 9, and a ground channel AC relay 10; a main contact 11 of the main channel AC contactor 1 is arranged between the main channel AC power supply and the first AC bus bar, a positive terminal 12 of the control coil of the main channel AC contactor 1 is connected to a normally closed contact 105 corresponding to a common terminal of a first group of contacts of the ground channel AC relay, and a main channel AC The negative terminal 13 of the control coil of the main channel AC conversion contactor is grounded; the main contact 21 of the main channel AC conversion contactor 2 is arranged between the common terminal of the main contacts of the standby channel AC conversion contactor and the ground channel AC contactor and the first AC bus bar, the positive terminal 22 of the control coil of the main channel AC conversion contactor is connected to the normally open contact 73 corresponding to the common terminal of the first group of contacts of the main channel AC conversion relay, the negative terminal 23 of the control coil of the main channel AC conversion contactor is grounded, the first group of contacts common terminal 24 of the main channel AC conversion contactor is connected to the normally open contact 63 corresponding to the common terminal of the first group of contacts of the main channel AC relay, and the normally closed contact 25 corresponding to the common terminal of the first group of contacts of the main channel AC conversion contactor is connected to the common terminal 104 of the first group of contacts of the ground channel AC relay; The first group of contact common terminals 61 and the second group of contact common terminals 62 of the main channel AC relay 6 are both connected to the 28V bus 15, and the normally closed contact 64 corresponding to the second group of contact common terminals of the main channel AC relay is connected to the positive terminal 72 of the control coil of the main channel AC conversion relay; the negative terminal 66 of the control coil of the main channel AC relay is grounded; the first group of contact common terminals 71 of the main channel AC conversion relay 7 is connected to the 28V bus 15; the main contact 31 of the standby channel AC contactor 3 is arranged between the standby channel AC power supply and the second AC bus, the positive terminal 32 of the control coil of the standby channel AC contactor 3 is connected to the normally closed contact 107 corresponding to the second group of contact common terminals of the ground channel AC relay, and the negative terminal 33 of the control coil of the main channel AC contactor is connected to the ground. The main contact 41 of the standby channel AC conversion contactor 4 is arranged between the common terminal of the main channel AC conversion contactor and the ground channel AC contactor and the second AC bus, the positive terminal 42 of the control coil of the standby channel AC conversion contactor is connected to the normally open contact 93 corresponding to the first group of contact common terminals of the standby channel AC conversion relay, and the negative terminal 43 of the control coil of the standby channel AC conversion contactor is grounded; the first group of contact common terminals 81 of the standby channel AC relay 8 is connected to the 28V bus 15; the negative terminal 86 of the control coil of the main channel AC relay is grounded; the first group of contact common terminals 91 of the standby channel AC conversion relay 9 is connected to the 28V bus 15; the positive terminal 92 of the control coil of the standby channel AC conversion relay is connected to the 28V bus 15;The main contact 51 of the ground channel AC contactor 5 is arranged between the AC ground channel power supply and the main contact common end of the main channel AC conversion contactor and the standby channel AC conversion contactor. The positive end 52 of the control coil of the ground channel AC contactor is connected to the normally open contact 109 corresponding to the third group of contact common ends of the ground channel AC relay, and the negative end 53 of the control coil of the ground channel AC contactor is grounded; the first group of contact common ends 54 of the ground channel AC contactor are connected to the 28V bus bar, and the normally open contact 55 corresponding to the first group of contact common ends is connected to the positive end 72 of the control coil of the main channel AC conversion relay; the negative end 103 of the control coil of the ground channel AC relay is grounded; the ground channel AC The second group of contact common terminals 106 of the relay are connected to the normally open contact 83 corresponding to the first group of contact common terminals of the standby channel AC relay; the output terminal of the first controller 16 is connected to the positive terminal 65 of the control coil of the main channel AC relay; the first output terminal of the second controller 17 is connected to the negative terminal of the control coil of the main channel AC conversion relay; the second output terminal is connected to the negative terminal of the control coil of the standby channel AC conversion relay; the third output terminal is connected to the positive terminal 102 of the control coil of the ground channel AC relay; the fourth output terminal is connected to the third group of contact common terminals 108 of the ground channel AC relay; the output terminal of the third controller 18 is connected to the positive terminal 85 of the control coil of the standby channel AC relay.;

[0005] Optionally, the main channel AC contactor 1 and the standby channel AC contactor 3 have a pull-in time of no more than 20ms, a release time of no more than 15ms, and have at least 2 sets of auxiliary contacts; the main channel AC relay 6 and the standby channel AC relay 8 have a pull-in time of no more than 7ms, a release time of no more than 7ms, and have at least 3 sets of contacts.

[0006] According to another aspect of an embodiment of the present invention, there is also provided an operation method of an aircraft AC power distribution network power supply conversion circuit based on prediction, wherein the operation method of any circuit comprises: the main channel AC relay 6 is controlled by the first controller 16, the main channel AC contactor 1 is controlled by the main channel AC relay normally open contact 63, the main channel AC conversion contactor normally closed contact 25 and the ground channel AC relay normally closed contact 105, the main channel AC conversion relay 7 is controlled by the second controller 17 and the main channel AC relay normally closed contact 64, the ground channel AC contactor normally open contact 55, and the main channel AC conversion contactor 2 is controlled by the main channel AC conversion relay normally open contact 73;

[0007] The standby channel AC relay 8 is controlled by the third controller 18, the standby channel AC contactor 3 is controlled by the standby channel AC relay normally open contact 83 and the ground channel AC relay normally closed contact 107, the standby channel AC conversion relay 9 is controlled by the second controller 17, and the standby channel AC conversion contactor 4 is controlled by the standby channel AC conversion relay normally open contact 93;

[0008] The ground channel AC relay 10 is controlled by the second controller 17 ; the ground channel AC contactor 5 is controlled by the ground channel AC relay normally open contact 109 .

[0009] Optionally, when both the AC main channel and the AC backup channel are not powered and the AC ground power supply is normal, the second controller 17 detects that the ground channel AC relay meets the grid-connected requirements, controls the ground channel AC relay 10 to close, cuts off the connection between the positive terminal 12 of the control coil of the main channel AC contactor 1 and the 28V bus 15, cuts off the connection between the positive terminal 32 of the control coil of the backup channel AC contactor 3 and the 28V bus 15, and the main channel AC contactor 1 and the backup channel AC contactor 3 that are not in the grid-connected state remain disconnected. The second controller 17 further detects that the ground channel AC contactor meets the grid-connected requirements, controls the ground channel AC contactor 5, the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 to close, the main channel AC conversion contactor 2 is controlled to close by the main channel AC conversion relay 7, and the backup channel AC conversion contactor 4 is controlled to close by the backup channel AC conversion relay 9.

[0010] Optionally, when the AC main channel and / or the AC backup channel are powered and the AC ground power supply is normal, the second controller 17 detects that the ground channel AC relay meets the grid-connected requirements, controls the ground channel AC relay 10 to close, cuts off the connection between the positive terminal 12 of the control coil of the main channel AC contactor 1 and the 28V bus 15, cuts off the connection between the positive terminal 32 of the control coil of the backup channel AC contactor 3 and the 28V bus 15, and the main channel AC contactor 1 and / or the backup channel AC contactor 3 in the grid-connected state are disconnected; at the same time, the second controller 17 maintains output control on the main channel AC conversion relay 7 and / or the backup channel AC conversion relay 9 in the grid-connected state; the second controller 17 further detects that the ground channel AC contactor meets the grid-connected requirements, controls the ground channel AC contactor 5, the main channel AC conversion relay 7 and / or the backup channel AC conversion relay 9 that are not grid-connected to close, and the main channel AC conversion contactor 2 and / or the backup channel AC conversion contactor 4 that are not grid-connected are controlled to close by the corresponding relays.

[0011] Optionally, when the AC ground power supply is powered and the AC main channel and / or AC backup channel are normal, the second controller 17 detects that the ground channel AC contactor does not meet the grid-connected requirements, controls the ground channel AC contactor 5 to disconnect, and predicts the next state of the main channel AC contactor 1 and the backup channel AC contactor 3 according to the state of the main channel AC relay 6 and the backup channel AC relay 8, and controls the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 according to the working conditions that the AC main channel and / or the AC backup channel are generating power normally and the AC ground power supply is not powered, and disconnects the ground channel AC relay 10 after detecting that the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 that need to be disconnected are disconnected from the ground channel AC contactor 5.

[0012] Optionally, when the AC ground power supply is supplied and the AC main channel and the AC backup channel are abnormal, the second controller 17 detects that the ground channel AC contactor does not meet the grid-connected requirements, controls the ground channel AC contactor 5 to disconnect, and predicts the next state of the main channel AC contactor 1 and the backup channel AC contactor 3 according to the state of the main channel AC relay 6 and the backup channel AC relay 8, and controls the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 according to the abnormal AC main channel and the AC backup channel and the abnormal AC ground power supply conditions, and disconnects the ground channel AC relay 10 after detecting that the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 that need to be disconnected are disconnected from the ground channel AC contactor 5.

[0013] Optionally, when the AC main channel generates electricity normally, the AC standby channel generates electricity abnormally and the AC ground channel is not powered, the first controller 16 detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay 6 to close, cuts off the connection between the positive terminal 72 of the main channel AC conversion relay control coil and the 28V bus 15, the main channel AC conversion relay 7 and the main channel AC conversion contactor 2 remain disconnected, the standby channel AC conversion relay 9 and the standby channel AC conversion contactor 4 remain disconnected, and the main channel AC contactor 1 is controlled to close after the main channel AC relay 6 is closed, so that the AC main channel supplies power to the first AC bus.

[0014] Optionally, when the AC standby channel generates electricity normally, the AC main channel generates electricity abnormally, and the AC ground channel is not powered, the third controller 18 detects that the standby channel AC contactor meets the grid requirements, controls the standby channel AC relay 8 to close, and the standby channel AC contactor 3 is controlled to close after the standby channel AC relay 8 is closed, so that the AC standby channel supplies power to the second AC bus. The second controller 17 controls the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 to close, and the main channel AC conversion contactor 2 and the standby channel AC conversion contactor 4 are controlled to close after the corresponding relays are closed, so that the AC standby channel supplies power to the first AC bus.

[0015] Optionally, when the AC main channel generates electricity normally, the AC standby channel generates electricity normally and the AC ground channel is not powered, the first controller 16 detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay 6 to close, cuts off the connection between the positive terminal 72 of the main channel AC conversion relay control coil and the 28V bus 15, and the main channel AC conversion relay 7 and the main channel AC conversion contactor 2 remain disconnected. The main channel AC contactor 1 is controlled to close after the main channel AC relay 6 is closed, so that the AC main channel supplies power to the first AC bus; the third controller 18 detects that the standby channel AC contactor meets the grid-connected requirements, controls the standby channel AC relay 8 to close, and the standby channel AC contactor 3 is controlled to close after the standby channel AC relay 8 is closed, so that the AC standby channel supplies power to the second AC bus; the second controller 16 controls the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 to disconnect, and the main channel AC conversion contactor 2 and the standby channel AC conversion contactor 4 remain disconnected.

[0016] Optionally, when the AC backup channel is powered and the AC main channel power generation resumes normal, the first controller 16 detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay 6 to close, cuts off the connection between the positive terminal 72 of the main channel AC conversion relay control coil and the 28V bus 15, and the main channel AC conversion relay 7 and the main channel AC conversion contactor 2 are immediately disconnected, and the main channel AC contactor 1 is controlled to close after the main channel AC conversion contactor 2 is disconnected, so as to restore power supply from the AC main channel to the first AC bus; the second controller 17 controls the main channel AC relay 7 and the backup channel AC relay 9 to disconnect, and the main channel AC conversion contactor 2 and the backup channel AC conversion contactor 4 to disconnect, so as to disconnect the power supply path from the AC backup channel to the first AC bus.

[0017] Optionally, the first controller 16 uses normal power generation of the AC main channel as the grid-connecting condition for the AC contactor of the main channel.

[0018] Optionally, the third controller 18 uses normal power generation of the AC standby channel as a condition for connecting the AC contactor of the standby channel to the grid.

[0019] Optionally, the second controller 17 disconnects the main channel AC contactor and sets the main channel AC power supply current to 0 as a judgment condition for the AC main channel being abnormal.

[0020] Optionally, the second controller 17 disconnects the standby channel AC contactor and sets the standby channel AC power supply current to 0 as a judgment condition for abnormality of the AC standby channel.

[0021] Optionally, the second controller 17 uses the abnormality of the AC main channel and the normality of the AC backup channel as the grid-connecting condition for the AC conversion relay of the main channel and the AC conversion relay of the backup channel.

[0022] The invention proposes a prediction-based aircraft AC power distribution network power supply conversion circuit and operation method, which are applied in the aviation field. The circuit comprises a contactor, a relay coil control circuit and a hardware interlocking network composed of normally closed / normally open contacts connected in series. Under the joint action of a first controller, a second controller, a third controller and the hardware interlocking network, the circuit ensures reliable networking of an AC ground channel under any working condition of the onboard AC main and backup channels, ensures reliable de-networking under the networking working condition of the AC ground channel, ensures reliable power supply under any working condition including only the main and backup channels, ensures reliable recovery of the AC main channel under the AC backup channel power supply working condition, effectively prevents redundant power supply channels from being connected in parallel, and improves the safety and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a power supply conversion circuit for AC power distribution network;

[0024] Figure 2 It is the first power supply conversion condition of the AC power distribution network;

[0025] Figure 3 It is the second power supply conversion condition of the AC power distribution network (the ground channel and the main channel are normal);

[0026] Figure 4 It is the second power supply conversion condition of the AC power distribution network (the ground channel and the backup channel are normal);

[0027] Figure 5 It is the second power supply conversion condition of the AC power distribution network (the ground channel and the main and backup channels are normal);

[0028] Figure 6 It is the third power supply conversion condition of the AC power distribution network (the ground channel and the main channel are normal);

[0029] Figure 7 It is the third power supply conversion condition of the AC power distribution network (the ground channel and the backup channel are normal);

[0030] Figure 8 It is the third power supply conversion condition of the AC power distribution network (the ground channel and the main and backup channels are normal);

[0031] Fig. 9 It is the fourth power supply conversion condition of the AC power distribution network;

[0032] Fig.10 It is the fifth power supply conversion condition of the AC power distribution network;

[0033] Fig.11 It is the sixth power supply conversion condition of the AC power distribution network;

[0034] Fig.12 It is the AC power distribution network power supply conversion condition seven and condition eight;

[0035] Description of reference numerals:

[0036] 1-main channel AC contactor, 2-main channel AC conversion contactor, 3-spare channel AC contactor, 4-spare channel AC conversion contactor, 5-ground channel AC contactor, 6-main channel AC relay, 7-main channel AC conversion relay, 8-spare channel AC relay, 9-spare channel AC conversion relay, 10-ground channel AC relay, 11-main contact of main channel AC contactor, 12-positive end of control coil of main channel AC contactor, 13-negative end of control coil of main channel AC contactor, 15-28V bus bar, 16-first controller, 17-second controller, 18-third controller, 21-main contact of main channel AC conversion contactor, 22-control coil of main channel AC conversion contactor The positive end of the control coil, 23-the negative end of the control coil of the main channel AC conversion contactor, 24-the common end of the first group of contacts of the main channel AC conversion contactor, 25-the normally closed contact corresponding to the common end of the first group of contacts of the main channel AC conversion contactor, 31-the main contact of the standby channel AC contactor, 32-the positive end of the control coil of the standby channel AC contactor, 33-the negative end of the control coil of the main channel AC contactor, 61-the common end of the first group of contacts of the main channel AC relay, 41-the main contact of the standby channel AC conversion contactor, 42-the positive end of the control coil of the standby channel AC conversion contactor, 43-the negative end of the control coil of the standby channel AC conversion contactor, 51-the main contact of the ground channel AC contactor, 52-the ground channel AC contactor The positive end of the control coil of the contactor, 53-the negative end of the control coil of the ground channel AC contactor, 54-the common end of the first group of contacts of the ground channel AC contactor, 55-the normally open contact corresponding to the common end of the first group of contacts, 62-the common end of the second group of contacts of the main channel AC relay, 63-the normally open contact corresponding to the common end of the first group of contacts of the main channel AC relay, 64-the normally closed contact corresponding to the common end of the second group of contacts of the main channel AC relay, 65-the positive end of the control coil of the main channel AC relay, 66-the negative end of the control coil of the main channel AC relay, 71-the common end of the first group of contacts of the main channel AC conversion relay, 72-the positive end of the control coil of the main channel AC conversion relay, 73-connect the first group of contacts of the main channel AC conversion relay The normally open contact corresponding to the common end of the group contact, 81-the common end of the first group of contacts of the standby channel AC relay, 83-the normally open contact corresponding to the common end of the first group of contacts of the standby channel AC relay, 85-the positive end of the control coil of the standby channel AC relay, 86-the negative end of the control coil of the main channel AC relay, 91-the common end of the first group of contacts of the standby channel AC conversion relay, 92-the positive end of the control coil of the standby channel AC conversion relay, 93-the normally open contact corresponding to the common end of the first group of contacts of the standby channel AC conversion relay, 103-the negative end of the control coil of the ground channel AC relay, 104-the common end of the first group of contacts of the ground channel AC relay, 105-the normally closed contact corresponding to the common end of the first group of contacts of the ground channel AC relay,106-the second group of contacts common terminal of the ground channel AC relay, 107-the normally closed contact corresponding to the second group of contacts common terminal of the ground channel AC relay, 109-the normally open contact corresponding to the third group of contacts common terminal of the ground channel AC relay, 108-the third group of contacts common terminal of the ground channel AC relay. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] According to one aspect of an embodiment of the present invention, a prediction-based aircraft AC power distribution network power conversion circuit is provided, such as Figure 1As shown, it includes: a main channel AC contactor 1, a main channel AC conversion contactor 2, a standby channel AC contactor 3, a standby channel AC conversion contactor 4, a ground channel AC contactor 5, a main channel AC relay 6, a main channel AC conversion relay 7, a standby channel AC relay 8, a standby channel AC conversion relay 9, and a ground channel AC relay 10; the main contact 11 of the main channel AC contactor 1 is arranged between the main channel AC power supply and the first AC bus bar, the positive end 12 of the control coil of the main channel AC contactor 1 is connected to the normally closed contact 105 corresponding to the common end of the first group of contacts of the ground channel AC relay, and the negative end 13 of the control coil of the main channel AC contactor is grounded; the main contact 11 of the main channel AC conversion contactor 2 is arranged between the main channel AC power supply and the first AC bus bar, the positive end 12 of the control coil of the main channel AC contactor 1 is connected to the normally closed contact 105 corresponding to the common end of the first group of contacts of the ground channel AC relay, and the negative end 13 of the control coil of the main channel AC contactor is grounded; The contact 21 is arranged between the common terminal of the main contacts of the standby channel AC conversion contactor and the ground channel AC contactor and the first AC bus bar, the positive terminal 22 of the control coil of the main channel AC conversion contactor is connected to the normally open contact 73 corresponding to the common terminal of the first group of contacts of the main channel AC conversion relay, the negative terminal 23 of the control coil of the main channel AC conversion contactor is grounded, the first group of contacts common terminal 24 of the main channel AC conversion contactor is connected to the normally open contact 63 corresponding to the common terminal of the first group of contacts of the main channel AC relay, and the normally closed contact 25 corresponding to the common terminal of the first group of contacts of the main channel AC conversion contactor is connected to the common terminal 104 of the first group of contacts of the ground channel AC relay; the first group of contacts common terminal 61 of the main channel AC relay is connected to the normally open contact 63 corresponding to the common terminal of the first group of contacts of the main channel AC conversion contactor. The second group of contact common terminals 62 are connected to the 28V bus 15, the normally closed contact 64 corresponding to the second group of contact common terminals of the main channel AC relay is connected to the positive terminal 72 of the control coil of the main channel AC conversion relay; the negative terminal 66 of the control coil of the main channel AC relay is grounded; the first group of contact common terminals 71 of the main channel AC conversion relay 7 is connected to the 28V bus 15; the main contacts 31 of the standby channel AC contactor 3 are arranged between the standby channel AC power supply and the second AC bus, the positive terminal 32 of the control coil of the standby channel AC contactor 3 is connected to the normally closed contact 107 corresponding to the second group of contact common terminals of the ground channel AC relay, and the negative terminal 33 of the control coil of the main channel AC contactor is grounded; the standby channel AC conversion contact The main contact 41 of the contactor 4 is arranged between the common terminal of the main contact of the main channel AC conversion contactor and the ground channel AC contactor and the second AC bus bar, the positive terminal 42 of the control coil of the standby channel AC conversion contactor is connected to the normally open contact 93 corresponding to the first group of contact common terminals of the standby channel AC conversion relay, and the negative terminal 43 of the control coil of the standby channel AC conversion contactor is grounded; the first group of contact common terminals 81 of the standby channel AC relay 8 is connected to the 28V bus bar 15; the negative terminal 86 of the control coil of the main channel AC relay is grounded; the first group of contact common terminals 91 of the standby channel AC conversion relay 9 is connected to the 28V bus bar 15; the positive terminal 92 of the control coil of the standby channel AC conversion relay is connected to the 28V bus bar 15;The main contact 51 of the ground channel AC contactor 5 is arranged between the AC ground channel power supply and the main contact common end of the main channel AC conversion contactor and the standby channel AC conversion contactor. The positive end 52 of the control coil of the ground channel AC contactor is connected to the normally open contact 109 corresponding to the third group of contact common ends of the ground channel AC relay, and the negative end 53 of the control coil of the ground channel AC contactor is grounded; the first group of contact common ends 54 of the ground channel AC contactor are connected to the 28V bus bar, and the normally open contact 55 corresponding to the first group of contact common ends is connected to the positive end 72 of the control coil of the main channel AC conversion relay; the negative end 103 of the control coil of the ground channel AC relay is grounded; the ground channel AC The second group of contact common terminals 106 of the relay are connected to the normally open contact 83 corresponding to the first group of contact common terminals of the standby channel AC relay; the output terminal of the first controller 16 is connected to the positive terminal 65 of the control coil of the main channel AC relay; the first output terminal of the second controller 17 is connected to the negative terminal of the control coil of the main channel AC conversion relay; the second output terminal is connected to the negative terminal of the control coil of the standby channel AC conversion relay; the third output terminal is connected to the positive terminal 102 of the control coil of the ground channel AC relay; the fourth output terminal is connected to the third group of contact common terminals 108 of the ground channel AC relay; the output terminal of the third controller 18 is connected to the positive terminal 85 of the control coil of the standby channel AC relay.;

[0039] Furthermore, the main channel AC contactor 1 and the standby channel AC contactor 3 have a pull-in time of no more than 20ms, a release time of no more than 15ms, and have at least 2 sets of auxiliary contacts. The main channel AC relay 6 and the standby channel AC relay 8 have a pull-in time of no more than 7ms, a release time of no more than 7ms, and have at least 3 sets of contacts.

[0040] According to another aspect of an embodiment of the present invention, there is also provided an operation method of an aircraft AC power distribution network power supply conversion circuit based on prediction, wherein the operation method of any circuit comprises: the main channel AC relay 6 is controlled by the first controller 16, the main channel AC contactor 1 is controlled by the main channel AC relay normally open contact 63, the main channel AC conversion contactor normally closed contact 25 and the ground channel AC relay normally closed contact 105, the main channel AC conversion relay 7 is controlled by the second controller 17 and the main channel AC relay normally closed contact 64, the ground channel AC contactor normally open contact 55, and the main channel AC conversion contactor 2 is controlled by the main channel AC conversion relay normally open contact 73;

[0041] The standby channel AC relay 8 is controlled by the third controller 18, the standby channel AC contactor 3 is controlled by the standby channel AC relay normally open contact 83 and the ground channel AC relay normally closed contact 107, the standby channel AC conversion relay 9 is controlled by the second controller 17, and the standby channel AC conversion contactor 4 is controlled by the standby channel AC conversion relay normally open contact 93;

[0042] The ground channel AC relay 10 is controlled by the second controller 17 ; the ground channel AC contactor 5 is controlled by the ground channel AC relay normally open contact 109 .

[0043] Furthermore, when both the AC main channel and the AC backup channel are not powered and the AC ground power supply is normal, the second controller 17 detects that the ground channel AC relay meets the grid-connected requirements, controls the ground channel AC relay 10 to close, cuts off the connection between the positive terminal 12 of the control coil of the main channel AC contactor 1 and the 28V bus 15, cuts off the connection between the positive terminal 32 of the control coil of the backup channel AC contactor 3 and the 28V bus 15, and the main channel AC contactor 1 and the backup channel AC contactor 3 that are not in the grid-connected state remain disconnected. The second controller 17 further detects that the ground channel AC contactor meets the grid-connected requirements, controls the ground channel AC contactor 5, the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 to close, the main channel AC conversion contactor 2 is controlled to close by the main channel AC conversion relay 7, and the backup channel AC conversion contactor 4 is controlled to close by the backup channel AC conversion relay 9.

[0044] Further, when the AC main channel and / or the AC backup channel are powered and the AC ground power supply is normal, the second controller 17 detects that the ground channel AC relay meets the grid-connected requirements, controls the ground channel AC relay 10 to close, cuts off the connection between the positive terminal 12 of the control coil of the main channel AC contactor 1 and the 28V bus 15, cuts off the connection between the positive terminal 32 of the control coil of the backup channel AC contactor 3 and the 28V bus 15, and the main channel AC contactor 1 and / or the backup channel AC contactor 3 in the grid-connected state are disconnected; at the same time, the second controller 17 maintains output control on the main channel AC conversion relay 7 and / or the backup channel AC conversion relay 9 in the grid-connected state; the second controller 17 further detects that the ground channel AC contactor meets the grid-connected requirements, controls the ground channel AC contactor 5, the main channel AC conversion relay 7 and / or the backup channel AC conversion relay 9 that are not grid-connected to close, and the main channel AC conversion contactor 2 and / or the backup channel AC conversion contactor 4 that are not grid-connected are controlled to close by the corresponding relays.

[0045] Furthermore, when the AC ground power supply is powered and the AC main channel and / or AC backup channel are normal, the second controller 17 detects that the ground channel AC contactor does not meet the grid-connected requirements, controls the ground channel AC contactor 5 to disconnect, and predicts the next state of the main channel AC contactor 1 and the backup channel AC contactor 3 according to the state of the main channel AC relay 6 and the backup channel AC relay 8. According to the operating conditions where the AC main channel and / or AC backup channel are generating power normally and the AC ground power supply is not powered, the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 are controlled, and after detecting that the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 that need to be disconnected are disconnected from the ground channel AC contactor 5, the ground channel AC relay 10 is disconnected.

[0046] Furthermore, when the AC ground power supply is supplied and the AC main channel and the AC backup channel are abnormal, the second controller 17 detects that the ground channel AC contactor does not meet the grid-connected requirements, controls the ground channel AC contactor 5 to disconnect, and predicts the next state of the main channel AC contactor 1 and the backup channel AC contactor 3 according to the state of the main channel AC relay 6 and the backup channel AC relay 8. According to the abnormal working conditions of the AC main channel and the AC backup channel and the abnormal AC ground power supply, the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 are controlled, and after detecting that the main channel AC conversion relay 7 and the backup channel AC conversion relay 9 that need to be disconnected are disconnected from the ground channel AC contactor 5, the ground channel AC relay 10 is disconnected.

[0047] Furthermore, when the AC main channel generates electricity normally, the AC standby channel generates electricity abnormally, and the AC ground channel is not powered, the first controller 16 detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay 6 to close, cuts off the connection between the positive terminal 72 of the main channel AC conversion relay control coil and the 28V bus 15, the main channel AC conversion relay 7 and the main channel AC conversion contactor 2 remain disconnected, the standby channel AC conversion relay 9 and the standby channel AC conversion contactor 4 remain disconnected, and the main channel AC contactor 1 is controlled to close after the main channel AC relay 6 is closed, so that the AC main channel supplies power to the first AC bus.

[0048] Furthermore, when the AC standby channel generates electricity normally, the AC main channel generates electricity abnormally, and the AC ground channel is not powered, the third controller 18 detects that the standby channel AC contactor meets the grid requirements, controls the standby channel AC relay 8 to close, and the standby channel AC contactor 3 is controlled to close after the standby channel AC relay 8 is closed, so that the AC standby channel supplies power to the second AC bus. The second controller 17 controls the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 to close, and the main channel AC conversion contactor 2 and the standby channel AC conversion contactor 4 are controlled to close after the corresponding relays are closed, so that the AC standby channel supplies power to the first AC bus.

[0049] Further, when the AC main channel generates electricity normally, the AC standby channel generates electricity normally and the AC ground channel is not powered, the first controller 16 detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay 6 to close, cuts off the connection between the positive terminal 72 of the main channel AC conversion relay control coil and the 28V bus 15, and the main channel AC conversion relay 7 and the main channel AC conversion contactor 2 remain disconnected. The main channel AC contactor 1 is controlled to close after the main channel AC relay 6 is closed, so that the AC main channel supplies power to the first AC bus; the third controller 18 detects that the standby channel AC contactor meets the grid-connected requirements, controls the standby channel AC relay 8 to close, and the standby channel AC contactor 3 is controlled to close after the standby channel AC relay 8 is closed, so that the AC standby channel supplies power to the second AC bus; the second controller 16 controls the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 to disconnect, and the main channel AC conversion contactor 2 and the standby channel AC conversion contactor 4 remain disconnected.

[0050] Furthermore, when the AC backup channel is powered and the AC main channel power generation resumes normal, the first controller 16 detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay 6 to close, and cuts off the connection between the positive terminal 72 of the main channel AC conversion relay control coil and the 28V bus 15. The main channel AC conversion relay 7 and the main channel AC conversion contactor 2 are immediately disconnected, and the main channel AC contactor 1 is controlled to close after the main channel AC conversion contactor 2 is disconnected, so as to restore the power supply from the AC main channel to the first AC bus; the second controller 17 controls the main channel AC relay 7 and the backup channel AC relay 9 to disconnect, and the main channel AC conversion contactor 2 and the backup channel AC conversion contactor 4 to disconnect, thereby disconnecting the power supply path from the AC backup channel to the first AC bus.

[0051] Furthermore, the first controller 16 regards the normal power generation of the AC main channel as the grid connection condition of the AC contactor of the main channel.

[0052] Furthermore, the third controller 18 uses the normal power generation of the AC standby channel as the grid connection condition for the AC contactor of the standby channel.

[0053] Furthermore, the second controller 17 disconnects the main channel AC contactor and sets the main channel AC power supply current to 0 as a judgment condition for the AC main channel being abnormal.

[0054] Furthermore, the second controller 17 disconnects the standby channel AC contactor and sets the standby channel AC power supply current to 0 as a judgment condition for the AC standby channel being abnormal.

[0055] Furthermore, the second controller 17 uses the abnormality of the AC main channel and the normality of the AC backup channel as the grid-connecting conditions for the AC conversion relay of the main channel and the AC conversion relay of the backup channel.

[0056] Example

[0057] The invention proposes a power supply conversion circuit for an aircraft AC power distribution network based on prediction. Figure 1 As shown, the power distribution network includes three power supply sources: an AC ground channel, an AC main channel and an AC standby channel. The AC ground channel is powered by connecting the first AC bus through the main contacts of the ground channel AC contactor and the main contacts of the main channel AC conversion contactor. The AC ground channel is powered by connecting the second AC bus through the main contacts of the ground channel AC contactor and the main contacts of the standby channel AC conversion contactor. The AC main channel is powered by connecting the first AC bus through the main contacts of the main channel AC contactor, and the AC standby channel is powered by connecting the second AC bus through the main contacts of the standby channel AC conversion contactor.

[0058] By adding ground channel AC relay, main channel AC relay, standby channel AC relay, main channel AC conversion relay and standby channel AC conversion relay, the contactors and relays are connected in series to form a hardware interlocking network, such as Figure 1 As shown. Under the joint action of the first controller, the second controller, the third controller and the hardware interlocking network, the reliable conversion between the ground channel and the main and backup channels on the aircraft is reliably guaranteed, the parallel connection of redundant power supply channels is effectively prevented, and the power supply conversion time between the ground channel and the main and backup channels is effectively shortened.

[0059] The main channel AC relay 6 is controlled by the first controller 16, the main channel AC contactor 1 is controlled by the main channel AC relay normally open contact 63, the main channel AC conversion contactor normally closed contact 25 and the ground channel AC relay normally closed contact 105, the main channel AC conversion relay 7 is controlled by the second controller 17 and the main channel AC relay normally closed contact 64, the ground channel AC contactor normally open contact 55, and the main channel AC conversion contactor 2 is controlled by the main channel AC conversion relay normally open contact 73.

[0060] The standby channel AC relay 8 is controlled by the third controller 18, the standby channel AC contactor 3 is controlled by the standby channel AC relay normally open contact 83 and the ground channel AC relay normally closed contact 107, the standby channel AC conversion relay 9 is controlled by the second controller 17, and the standby channel AC conversion contactor 4 is controlled by the standby channel AC conversion relay normally open contact 93.

[0061] The ground channel AC relay 10 is controlled by the second controller 17 ; the ground channel AC contactor 5 is controlled by the ground channel AC relay normally open contact 109 .

[0062] When both the AC main channel and the AC backup channel are not powered and the AC ground power supply is normal (working condition 1), the working conditions are as follows:

[0063] The second controller 17 detects that the ground channel AC relay meets the grid-casting requirements, controls the ground channel AC relay 10 to close, cuts off the connection between the positive terminal 12 of the control coil of the main channel AC contactor 1 and the 28V bus 15, cuts off the connection between the positive terminal 32 of the control coil of the standby channel AC contactor 3 and the 28V bus 15, and the main channel AC contactor 1 and the standby channel AC contactor 3 that are not in the grid-casting state remain disconnected. The second controller 17 further detects that the ground channel AC contactor meets the grid-casting requirements, controls the ground channel AC contactor 5, the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 to close, the main channel AC conversion contactor 2 is controlled to close by the main channel AC conversion relay 7, and the standby channel AC conversion contactor 4 is controlled to close by the standby channel AC conversion relay 9. Figure 2 shown.

[0064] Ensure reliable grid connection of the AC ground channel when both the AC main channel and the AC backup channel are not powered and the AC ground power supply is normal.

[0065] When the AC main channel and / or AC backup channel are powered and the AC ground power supply is normal (working condition 2), the working conditions are as follows:

[0066] The second controller 17 detects that the ground channel AC relay meets the grid-connected requirements, controls the ground channel AC relay 10 to close, cuts off the connection between the positive terminal 12 of the control coil of the main channel AC contactor 1 and the 28V bus 15, cuts off the connection between the positive terminal 32 of the control coil of the standby channel AC contactor 3 and the 28V bus 15, and disconnects the main channel AC contactor 1 and / or the standby channel AC contactor 3 in the grid-connected state; at the same time, the second controller 17 maintains output control on the main channel AC conversion relay 7 and / or the standby channel AC conversion relay 9 in the grid-connected state; the second controller 17 further detects that the ground channel AC contactor meets the grid-connected requirements, controls the ground channel AC contactor 5, the main channel AC conversion relay 7 and / or the standby channel AC conversion relay 9 that are not grid-connected to close, and the main channel AC conversion contactor 2 and / or the standby channel AC conversion contactor 4 that are not grid-connected are controlled to close by the corresponding relays, such as Figures 3 to 5 shown.

[0067] Ensure that when the AC main channel and / or AC backup channel are powered and the AC ground power supply is normal, the AC main channel and / or AC backup channel can be reliably disconnected from the grid and the AC ground channel can be reliably connected to the grid.

[0068] When the AC ground power supply is on and the AC main channel and / or AC backup channel are normal (working condition 3), the working conditions are as follows:

[0069] The second controller 17 detects that the ground channel AC contactor does not meet the grid-connected requirements, controls the ground channel AC contactor 5 to be disconnected, and predicts the next state of the main channel AC contactor 1 and the standby channel AC contactor 3 according to the state of the main channel AC relay 6 and the standby channel AC relay 8. According to the working condition that the AC main channel and / or the AC standby channel generate power normally and the AC ground power supply is not powered, controls the main channel AC conversion relay 7 and the standby channel AC conversion relay 9, and disconnects the ground channel AC relay 10 after detecting that the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 that need to be disconnected are disconnected from the ground channel AC contactor 5. Figures 6 to 8 shown.

[0070] Ensure that when the AC ground power supply is supplied and the AC main channel and / or AC backup channel are normal, the AC ground channel can be reliably disconnected from the grid and the AC main channel and / or AC backup channel can be reliably connected to the grid.

[0071] When the AC ground power supply is on and the AC main channel and AC backup channel are abnormal (working condition 4), the working conditions are as follows:

[0072] The second controller 17 detects that the ground channel AC contactor does not meet the grid-connected requirements, controls the ground channel AC contactor 5 to be disconnected, and predicts the next state of the main channel AC contactor 1 and the standby channel AC contactor 3 according to the state of the main channel AC relay 6 and the standby channel AC relay 8. According to the abnormal working conditions of the AC main channel and the AC standby channel and the abnormal AC ground power supply, the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 are controlled, and after detecting that the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 that need to be disconnected are disconnected from the ground channel AC contactor 5, the ground channel AC relay 10 is disconnected. Fig. 9 shown.

[0073] Ensure reliable disconnection of the AC ground channel from the grid when the AC ground power supply is on and the AC main channel and AC backup channel are abnormal.

[0074] When the AC main channel generates power normally, the AC backup channel generates power abnormally, and the AC ground channel is not powered (operating condition 5), the working conditions are as follows:

[0075] The first controller 16 detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay 6 to close, cuts off the connection between the main channel AC conversion relay control coil positive terminal 72 and the 28V bus 15, the main channel AC conversion relay 7 and the main channel AC conversion contactor 2 remain disconnected, the standby channel AC conversion relay 9 and the standby channel AC conversion contactor 4 remain disconnected, and the main channel AC contactor 1 is controlled to close after the main channel AC relay 6 is closed, so that the AC main channel supplies power to the first AC bus, such as Fig.10 shown.

[0076] Ensure reliable grid connection of the AC main channel when the AC main channel is generating power normally, the AC backup channel is generating power abnormally, and the AC ground channel is not powered.

[0077] When the AC backup channel generates power normally, the AC main channel generates power abnormally, and the AC ground channel is not powered (operating condition 6), the working conditions are as follows:

[0078] The third controller 18 detects that the standby channel AC contactor meets the grid-connected requirements, controls the standby channel AC relay 8 to close, and the standby channel AC contactor 3 is controlled to close after the standby channel AC relay 8 is closed, so that the AC standby channel supplies power to the second AC bus. The second controller 17 controls the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 to close, and the main channel AC conversion contactor 2 and the standby channel AC conversion contactor 4 are controlled to close after the corresponding relays are closed, so that the AC standby channel supplies power to the first AC bus. Fig.11 shown.

[0079] Ensure that the AC backup channel can be reliably put into the grid when the AC backup channel is generating power normally, the AC main channel is generating power abnormally, and the AC ground channel is not powered.

[0080] When the AC main channel is generating power normally, the AC backup channel is generating power normally, and the AC ground channel is not powered (operating condition 7), the working conditions are as follows:

[0081] The first controller 16 detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay 6 to close, cuts off the connection between the main channel AC conversion relay control coil positive terminal 72 and the 28V bus 15, and the main channel AC conversion relay 7 and the main channel AC conversion contactor 2 remain disconnected. The main channel AC contactor 1 is controlled to close after the main channel AC relay 6 is closed, so that the AC main channel supplies power to the first AC bus; the third controller 18 detects that the standby channel AC contactor meets the grid-connected requirements, controls the standby channel AC relay 8 to close, and the standby channel AC contactor 3 is controlled to close after the standby channel AC relay 8 is closed, so that the AC standby channel supplies power to the second AC bus; the second controller 16 controls the main channel AC conversion relay 7 and the standby channel AC conversion relay 9 to disconnect, and the main channel AC conversion contactor 2 and the standby channel AC conversion contactor 4 remain disconnected, such as Fig.12 shown.

[0082] Ensure reliable grid connection of the AC main channel and the AC backup channel when the AC main channel is generating power normally, the AC backup channel is generating power normally, and the AC ground channel is not powered.

[0083] When the AC backup channel is powered and the AC main channel power generation returns to normal (operating condition eight), the working conditions are as follows:

[0084] The first controller 16 detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay 6 to close, cuts off the connection between the main channel AC conversion relay control coil positive terminal 72 and the 28V bus 15, and the main channel AC conversion relay 7 and the main channel AC conversion contactor 2 are disconnected immediately. The main channel AC contactor 1 is controlled to close after the main channel AC conversion contactor 2 is disconnected, so that the AC main channel can resume power supply to the first AC bus; the second controller 17 controls the main channel AC relay 6 and the standby channel AC relay 8 to disconnect, the main channel AC conversion contactor 2 and the standby channel AC conversion contactor 4 to disconnect, and disconnects the power supply path of the AC standby channel to the first AC bus, such as Fig.12 shown.

[0085] Ensure that the AC main channel can be reliably restored and put into the grid when the AC backup channel is powered and the AC main channel power generation returns to normal.

[0086] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A prediction-based aircraft AC power distribution network power conversion circuit, characterized in that: include: Main channel AC contactor (1), main channel AC conversion contactor (2), spare channel AC contactor (3), spare channel AC conversion contactor (4), ground channel AC contactor (5), main channel AC relay (6), main channel AC conversion relay (7), spare channel AC relay (8), spare channel AC conversion relay (9), ground channel AC relay (10); The main contact (11) of the main channel AC contactor (1) is arranged between the main channel AC power supply and the first AC bus bar, the positive end (12) of the control coil of the main channel AC contactor (1) is connected to the normally closed contact (105) corresponding to the common end of the first group of contacts of the ground channel AC relay, and the negative end (13) of the control coil of the main channel AC contactor is grounded; The main contact (21) of the main channel AC conversion contactor (2) is arranged between the common end of the main contacts of the standby channel AC conversion contactor and the ground channel AC contactor and the first AC busbar; the positive end (22) of the control coil of the main channel AC conversion contactor is connected to the normally open contact (73) corresponding to the common end of the first group of contacts of the main channel AC conversion relay; the negative end (23) of the control coil of the main channel AC conversion contactor is grounded; the first group of contacts of the main channel AC conversion contactor is connected to the normally open contact (63) corresponding to the common end of the first group of contacts of the main channel AC relay; and the normally closed contact (25) corresponding to the common end of the first group of contacts of the main channel AC conversion contactor is connected to the common end (104) of the first group of contacts of the ground channel AC relay; The first group of contact common terminals (61) and the second group of contact common terminals (62) of the main channel AC relay (6) are both connected to the 28V bus bar (15); the normally closed contact (64) corresponding to the second group of contact common terminals of the main channel AC relay is connected to the positive terminal (72) of the main channel AC conversion relay control coil; the negative terminal (66) of the main channel AC relay control coil is grounded; The first group of contact common ends (71) of the main channel AC conversion relay (7) is connected to the 28V bus bar (15); the main contact (31) of the standby channel AC contactor (3) is arranged between the standby channel AC power supply and the second AC bus bar, the positive end (32) of the control coil of the standby channel AC contactor (3) is connected to the normally closed contact (107) corresponding to the second group of contact common ends of the ground channel AC relay, and the negative end (33) of the control coil of the main channel AC contactor is grounded; The main contact (41) of the standby channel AC conversion contactor (4) is arranged between the common end of the main channel AC conversion contactor and the ground channel AC contactor main contacts and the second AC bus bar, the positive end (42) of the control coil of the standby channel AC conversion contactor is connected to the normally open contact (93) corresponding to the common end of the first group of contacts of the standby channel AC conversion relay, and the negative end (43) of the control coil of the standby channel AC conversion contactor is grounded; The first group of contact common terminals (81) of the standby channel AC relay (8) is connected to the 28V bus bar (15); the negative terminal (86) of the control coil of the main channel AC relay is grounded; The first group of contact common ends (91) of the standby channel AC conversion relay (9) is connected to a 28V bus bar (15); the positive end (92) of the control coil of the standby channel AC conversion relay is connected to the 28V bus bar (15); the main contact (51) of the ground channel AC contactor (5) is arranged between the AC ground channel power supply and the main contact common ends of the main channel AC conversion contactor and the standby channel AC conversion contactor; the positive end (52) of the control coil of the ground channel AC contactor is connected to a normally open contact (109) corresponding to the third group of contact common ends of the ground channel AC relay; and the negative end (53) of the control coil of the ground channel AC contactor is grounded; the first group of contact common ends (54) of the ground channel AC contactor is connected to the 28V bus bar, and the normally open contact (55) corresponding to the first group of contact common ends is connected to the positive end (72) of the control coil of the main channel AC conversion relay; The negative terminal (103) of the control coil of the ground channel AC relay is grounded; the second group of contact common terminals (106) of the ground channel AC relay are connected to the normally open contact (83) corresponding to the first group of contact common terminals of the standby channel AC relay; The output end of the first controller (16) is connected to the positive end (65) of the control coil of the main channel AC relay; The first output end of the second controller (17) is connected to the negative end of the control coil of the main channel AC conversion relay; the second output end is connected to the negative end of the control coil of the backup channel AC conversion relay; the third output end is connected to the positive end (102) of the control coil of the ground channel AC relay; and the fourth output end is connected to the common end (108) of the third group of contacts of the ground channel AC relay; The output end of the third controller (18) is connected to the positive end (85) of the control coil of the backup channel AC relay.

2. The circuit according to claim 1, characterized in that The main channel AC contactor (1) and the standby channel AC contactor (3) have a pull-in time of no more than 20ms and a release time of no more than 15ms, and have at least two sets of auxiliary contacts; the main channel AC relay (6) and the standby channel AC relay (8) have a pull-in time of no more than 7ms and a release time of no more than 7ms, and have at least three sets of contacts.

3. A method for operating an aircraft AC power distribution network power conversion circuit based on prediction, characterized in that: The operating method of any circuit as described in claim 1-2 comprises: the main channel AC relay (6) is controlled by the first controller (16), the main channel AC contactor (1) is controlled by the main channel AC relay normally open contact (63), the main channel AC conversion contactor normally closed contact (25) and the ground channel AC relay normally closed contact (105), the main channel AC conversion relay (7) is controlled by the second controller (17) and the main channel AC relay normally closed contact (64), the ground channel AC contactor normally open contact (55), and the main channel AC conversion contactor (2) is controlled by the main channel AC conversion relay normally open contact (73); The standby channel AC relay (8) is controlled by a third controller (18), the standby channel AC contactor (3) is controlled by a standby channel AC relay normally open contact (83) and a ground channel AC relay normally closed contact (107), the standby channel AC conversion relay (9) is controlled by a second controller (17), and the standby channel AC conversion contactor (4) is controlled by a standby channel AC conversion relay normally open contact (93); The ground channel AC relay (10) is controlled by the second controller (17); the ground channel AC contactor (5) is controlled by the normally open contact (109) of the ground channel AC relay.

4. The method according to claim 3, characterized in that When both the AC main channel and the AC standby channel are not powered and the AC ground power supply is normal, the second controller (17) detects that the ground channel AC relay meets the grid connection requirements, controls the ground channel AC relay (10) to close, cuts off the connection between the positive end (12) of the control coil of the main channel AC contactor (1) and the 28V bus bar (15), cuts off the connection between the positive end (32) of the control coil of the standby channel AC contactor (3) and the 28V bus bar (15), and the main channel AC contactor (1) and the standby channel AC contactor (3) that are not in the grid connection state remain disconnected. The second controller (17) further detects that the ground channel AC contactor meets the grid connection requirements, controls the ground channel AC contactor (5), the main channel AC conversion relay (7) and the standby channel AC conversion relay (9) to close, the main channel AC conversion contactor (2) is controlled to close by the main channel AC conversion relay (7), and the standby channel AC conversion contactor (4) is controlled to close by the standby channel AC conversion relay (9).

5. The method according to claim 3, characterized in that: When the AC main channel and / or the AC backup channel are powered and the AC ground power supply is normal, the second controller (17) detects that the ground channel AC relay meets the grid-connected requirements, controls the ground channel AC relay (10) to close, cuts off the connection between the positive terminal (12) of the control coil of the main channel AC contactor (1) and the 28V bus bar (15), cuts off the connection between the positive terminal (32) of the control coil of the backup channel AC contactor (3) and the 28V bus bar (15), and the main channel AC contactor (1) and / or the backup channel AC contactor (3) in the grid-connected state are disconnected. ) is disconnected; at the same time, the second controller (17) maintains output control on the main channel AC conversion relay (7) and / or the standby channel AC conversion relay (9) in the grid-connected state; the second controller (17) further detects that the ground channel AC contactor meets the grid-connected requirements, controls the ground channel AC contactor (5), the main channel AC conversion relay (7) and / or the standby channel AC conversion relay (9) that are not grid-connected to close, and the main channel AC conversion contactor (2) and / or the standby channel AC conversion contactor (4) that are not grid-connected to close under the control of the corresponding relays.

6. The method according to claim 3, characterized in that When the AC ground power supply is powered and the AC main channel and / or AC standby channel are normal, the second controller (17) detects that the ground channel AC contactor does not meet the grid-connected requirements, controls the ground channel AC contactor (5) to be disconnected, and predicts the next state of the main channel AC contactor (1) and the standby channel AC contactor (3) according to the state of the main channel AC relay (6) and the standby channel AC relay (8), controls the main channel AC conversion relay (7) and the standby channel AC conversion relay (9) according to the working condition that the AC main channel and / or the AC standby channel are generating power normally and the AC ground power supply is not powered, and disconnects the ground channel AC relay (10) after detecting that the main channel AC conversion relay (7) and the standby channel AC conversion relay (9) that need to be disconnected are disconnected from the ground channel AC contactor (5).

7. The method according to claim 3, characterized in that When the AC ground power supply is supplied and the AC main channel and the AC standby channel are abnormal, the second controller (17) detects that the ground channel AC contactor does not meet the grid-connected requirements, controls the ground channel AC contactor (5) to be disconnected, and predicts the next state of the main channel AC contactor (1) and the standby channel AC contactor (3) according to the state of the main channel AC relay (6) and the standby channel AC relay (8), controls the main channel AC conversion relay (7) and the standby channel AC conversion relay (9) according to the abnormal working conditions of the AC main channel and the AC standby channel and the abnormal AC ground power supply, and disconnects the ground channel AC relay (10) after detecting that the main channel AC conversion relay (7) and the standby channel AC conversion relay (9) that need to be disconnected are disconnected from the ground channel AC contactor (5).

8. The method according to claim 3, characterized in that When the AC main channel generates electricity normally, the AC standby channel generates electricity abnormally, and the AC ground channel is not powered, the first controller (16) detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay (6) to close, cuts off the connection between the positive end (72) of the main channel AC conversion relay control coil and the 28V bus (15), the main channel AC conversion relay (7) and the main channel AC conversion contactor (2) remain disconnected, the standby channel AC conversion relay (9) and the standby channel AC conversion contactor (4) remain disconnected, and the main channel AC contactor (1) is controlled to close after the main channel AC relay (6) is closed, so that the AC main channel supplies power to the first AC bus.

9. The method according to claim 3, characterized in that: When the AC standby channel generates power normally, the AC main channel generates power abnormally, and the AC ground channel is not powered, the third controller (18) detects that the standby channel AC contactor meets the grid-connected requirements, controls the standby channel AC relay (8) to close, and the standby channel AC contactor (3) is controlled to close after the standby channel AC relay (8) is closed, so that the AC standby channel supplies power to the second AC bus; the second controller (17) controls the main channel AC conversion relay (7) and the standby channel AC conversion relay (9) to close, and the main channel AC conversion contactor (2) and the standby channel AC conversion contactor (4) are controlled to close after the corresponding relays are closed, so that the AC standby channel supplies power to the first AC bus.

10. The method according to claim 3, characterized in that: When the AC main channel generates electricity normally, the AC standby channel generates electricity normally and the AC ground channel is not powered, the first controller (16) detects that the main channel AC contactor meets the grid connection requirements, controls the main channel AC relay (6) to close, cuts off the connection between the main channel AC conversion relay control coil positive terminal (72) and the 28V bus (15), the main channel AC conversion relay (7) and the main channel AC conversion contactor (2) remain disconnected, the main channel AC contactor (1) is controlled to close after the main channel AC relay (6) is closed, and the AC main channel supplies power to the first AC bus; the third controller (18) detects that the standby channel AC contactor meets the grid connection requirements, controls the standby channel AC relay (8) to close, and the standby channel AC contactor (3) is controlled to close after the standby channel AC relay (8) is closed, and the AC standby channel supplies power to the second AC bus; the second controller (16) controls the main channel AC conversion relay (7) and the standby channel AC conversion relay (9) to disconnect, and the main channel AC conversion contactor (2) and the standby channel AC conversion contactor (4) remain disconnected.

11. The method according to claim 3, characterized in that When the AC standby channel supplies power and the AC main channel resumes normal power generation, the first controller (16) detects that the main channel AC contactor meets the grid-connected requirements, controls the main channel AC relay (6) to close, cuts off the connection between the main channel AC conversion relay control coil positive terminal (72) and the 28V bus (15), and the main channel AC conversion relay (7) and the main channel AC conversion contactor (2) are disconnected immediately. The main channel AC contactor (1) is controlled to close after the main channel AC conversion contactor (2) is disconnected, so that the AC main channel resumes power supply to the first AC bus; the second controller (17) controls the main channel AC relay (7) and the standby channel AC relay (9) to disconnect, the main channel AC conversion contactor (2) and the standby channel AC conversion contactor (4) to disconnect, and disconnects the power supply path from the AC standby channel to the first AC bus.

12. The method according to any one of claims 4 to 10, characterized in that: The first controller (16) uses the normal power generation of the AC main channel as the grid-connecting condition of the AC contactor of the main channel.

13. The method according to any one of claims 4 to 10, characterized in that: The third controller (18) uses the normal power generation of the AC standby channel as the grid connection condition of the AC contactor of the standby channel.

14. The method according to any one of claims 4 to 10, characterized in that: The second controller (17) disconnects the main channel AC contactor and sets the main channel AC power supply current to 0 as a judgment condition for abnormality of the AC main channel.

15. The method according to any one of claims 4 to 10, characterized in that: The second controller (17) disconnects the standby channel AC contactor and sets the standby channel AC power supply current to 0 as a judgment condition for abnormality of the AC standby channel.

16. The method according to claim 9, characterized in that The second controller (17) uses the abnormality of the AC main channel and the normality of the AC backup channel as the grid-connecting conditions for the AC conversion relay of the main channel and the AC conversion relay of the backup channel.

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