Helicopter variable frequency AC starting power supply circuit and control method

Abstract

The application relates to the field of aircraft power supply system design, in particular to a helicopter variable-frequency AC starting power supply circuit and a control method, the circuit comprising an AC ground power supply, an AC generator power supply and a three-phase static converter power supply. The application adopts the AC ground power supply, the AC generator and the three-phase static converter as the starting power supply, and adopts the AC power supply as the starting power supply of a certain type of engine, so that the starting requirement of the helicopter engine under various working conditions can be met.

Description

Technical Field

[0001] This invention relates to the field of aircraft power system design, specifically to a variable frequency AC starting power supply circuit and control method for helicopters. Background Technology

[0002] Traditionally, helicopter engines used low-voltage DC starting. However, as the starting power requirements of helicopter engines have increased, low-voltage DC starting is no longer sufficient. Therefore, many helicopter engines have begun to adopt variable frequency AC starting. A certain type of engine uses variable frequency AC starting, with a starting power supply of 115V, 400Hz AC constant frequency. During operation, AC ground power and an onboard AC generator can be used for starting. However, in the field where AC ground power is unavailable, a three-phase static converter is required for starting. Since AC ground power, AC generator power, and three-phase static converter power can all be used to start the engine, a helicopter variable frequency AC starting power supply circuit and control method need to be designed to implement the priority power supply logic for these three power sources. Summary of the Invention

[0003] The purpose of this invention is to provide a variable frequency AC starting power supply circuit and control method for helicopters. As a starting power supply for a certain type of engine, AC power can meet the starting requirements of helicopter engines under various operating conditions. This invention uses AC ground power supply, AC generator, and three-phase static converter as starting power supply.

[0004] The technical solution of the present invention:

[0005] A helicopter variable frequency AC starting power supply circuit includes an AC ground power supply, an AC generator power supply, and a three-phase static converter power supply.

[0006] The AC ground power supply includes an AC external power supply 1, an external power contactor 2, and a busbar power controller 3. The AC external power supply 1 is connected to the external power contactor 2, and the busbar power controller 3 is connected to the external power contactor 2 to control the on / off state of the external power contactor 2.

[0007] The AC generator power supply includes AC generator 4, AC generator controller 5, contactor 6, AC generator 7, AC generator controller 8, and contactor 9. AC generator 4 is connected to contactor 6, AC generator controller 5 is connected to AC generator 4 and contactor 6 respectively, and contactor 6 is connected to external power contactor 2.

[0008] The No. 2 alternator 7 is connected to the No. 2 contactor 9. The No. 2 alternator controller 8 is connected to the No. 2 alternator 7 and the No. 2 contactor 9 respectively. The No. 2 contactor 9 is connected to the external power contactor 2 and the No. 1 contactor 6 respectively.

[0009] The three-phase static converter power supply includes a three-phase static converter 10, a three-phase static converter contactor 11, and a starting busbar 12. The three-phase static converter contactor 11 is connected to contactor 6 (number 1) and contactor 9 (number 2), respectively. The three-phase static converter 10 is connected to the three-phase static converter contactor 11, and the three-phase static converter contactor 11 is connected to the starting busbar 12.

[0010] Furthermore, the three-phase static converter 10 is connected to the three-phase static converter contactor 11 via one wire to supply power to the three-phase static converter contactor 11, and is connected to the three-phase static converter contactor 11 via another wire to control the on / off state of the three-phase static converter contactor 11.

[0011] Furthermore, the starting power of the three-phase static converter 10 is greater than 30kVA.

[0012] Furthermore, the starting busbar 12 is connected to the variable frequency AC starter generator controller for controlling the starter generator.

[0013] A control method for a helicopter variable frequency AC starting power supply circuit, the control method including an AC ground power starting method, an AC generator power starting method, and a three-phase static converter power starting method, wherein the AC ground power starting method takes precedence over the AC generator power starting method, and the AC generator power starting method takes precedence over the three-phase static converter power starting method.

[0014] Furthermore, the AC ground power supply starting method is as follows:

[0015] When the airport has AC ground power, the busbar power controller 3 detects that the voltage, frequency, and phase sequence of the AC external power supply meet the requirements, and drives the external power contactor 2 to connect. After the external power contactor 2 is connected, it is interlocked with the circuit of contactor 6 and contactor 9, causing contactor 6 and contactor 9 to be unable to connect. This allows the AC external power supply 1 to supply power to the aircraft starting busbar 12 through external power contactor 2, contactor 6, and three-phase static converter contactor 11.

[0016] Furthermore, the method for starting the alternator power supply is as follows:

[0017] When AC generator 4 is working normally, AC generator controller 5 controls contactor 6 to be turned on, and AC generator 4 supplies power to the starting busbar 12 on the machine through contactor 6 and three-phase static converter contactor 11.

[0018] When AC generator 4 fails, AC generator controller 5 controls contactor 6 to disconnect, AC generator controller 7 controls contactor 9 to connect, and AC generator 7 supplies power to the starting busbar 12 on the machine through contactor 9, external power contactor 2, and three-phase static converter contactor 11.

[0019] Furthermore, the starting method for a three-phase static converter power supply is as follows:

[0020] When the three-phase static converter 10 receives the control switch signal from the machine, it drives the three-phase static converter contactor 11 to turn on, and the three-phase static converter 10 supplies power to the machine starting busbar 12 through the three-phase static converter contactor 11.

[0021] The beneficial effects of the present invention are as follows: The present invention provides a variable frequency AC starting power supply circuit and control method for helicopters. The present invention uses AC ground power supply, AC generator and three-phase static converter as starting power supply. As a certain type of engine, the use of AC power supply as starting power supply can meet the starting requirements of helicopter engines under various operating conditions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the AC starting power supply circuit structure of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, a helicopter variable frequency AC starting power supply circuit includes an AC ground power supply, an AC generator power supply, and a three-phase static converter power supply.

[0025] The AC ground power supply includes an AC external power supply 1, an external power contactor 2, and a busbar power controller 3. The AC external power supply 1 is connected to the external power contactor 2, and the busbar power controller 3 is connected to the external power contactor 2 to control the on / off state of the external power contactor 2.

[0026] The AC generator power supply includes AC generator 4, AC generator controller 5, contactor 6, AC generator 7, AC generator controller 8, and contactor 9. AC generator 4 is connected to contactor 6, AC generator controller 5 is connected to AC generator 4 and contactor 6 respectively, and contactor 6 is connected to external power contactor 2.

[0027] The No. 2 alternator 7 is connected to the No. 2 contactor 9. The No. 2 alternator controller 8 is connected to the No. 2 alternator 7 and the No. 2 contactor 9 respectively. The No. 2 contactor 9 is connected to the external power contactor 2 and the No. 1 contactor 6 respectively.

[0028] The three-phase static converter power supply includes a three-phase static converter 10, a three-phase static converter contactor 11, and a starting busbar 12. The three-phase static converter contactor 11 is connected to contactor 6 (number 1) and contactor 9 (number 2), respectively. The three-phase static converter 10 is connected to the three-phase static converter contactor 11, and the three-phase static converter contactor 11 is connected to the starting busbar 12.

[0029] like Figure 1 As shown, the three-phase static converter 10 is connected to the three-phase static converter contactor 11 through one wire to supply power to the three-phase static converter contactor 11, and is connected to the three-phase static converter contactor 11 through another wire to control the on and off of the three-phase static converter contactor 11.

[0030] like Figure 1 As shown, the starting power of the three-phase static converter 10 is greater than 30kVA in order to meet the starting power requirements of the helicopter engine.

[0031] like Figure 1 As shown, the starting busbar 12 is connected to the variable frequency AC starter generator controller for controlling the starter generator.

[0032] In an embodiment of the present invention, when the busbar power controller 3 detects that the voltage, frequency, phase sequence, etc. of the AC external power supply meet the requirements, it drives the external power contactor 2 to be turned on, so that the AC external power supply 1 supplies power to the machine starting busbar 12 through the external power contactor 2, contactor 6, and three-phase static converter contactor 11.

[0033] The No. 1 alternator 4 is used in conjunction with the No. 1 alternator controller 5 to realize voltage regulation and fault protection of the AC power system. When the No. 1 alternator controller 5 controls the No. 1 contactor 6 to be turned on, the No. 1 alternator 4 supplies power to the on-board starting busbar 12 through the No. 1 contactor 6 and the three-phase static converter contactor 11.

[0034] The No. 2 alternator 7 is used in conjunction with the No. 2 alternator controller 8 to realize voltage regulation and fault protection of the AC power system. When the No. 2 alternator controller 7 controls the No. 2 contactor 9 to be turned on, the No. 2 alternator 7 supplies power to the on-board starting busbar 12 through the No. 2 contactor 9, the external power contactor 2, and the three-phase static converter contactor 11.

[0035] When the three-phase static converter 10 receives the control switch signal from the machine, it drives the three-phase static converter contactor 11 to turn on, and the three-phase static converter 10 supplies power to the machine starting busbar 12 through the three-phase static converter contactor 11.

[0036] A control method for a helicopter variable frequency AC starting power supply circuit, the control method including an AC ground power starting method, an AC generator power starting method, and a three-phase static converter power starting method, wherein the AC ground power starting method takes precedence over the AC generator power starting method, and the AC generator power starting method takes precedence over the three-phase static converter power starting method.

[0037] 1. The starting method for AC ground power supply is as follows:

[0038] When the airport has AC ground power, the busbar power controller 3 detects that the voltage, frequency, and phase sequence of the AC external power supply meet the requirements, and drives the external power contactor 2 to connect. After the external power contactor 2 is connected, it is interlocked with the circuit of contactor 6 and contactor 9, causing contactor 6 and contactor 9 to be unable to connect. This allows the AC external power supply 1 to supply power to the aircraft starting busbar 12 through external power contactor 2, contactor 6, and three-phase static converter contactor 11.

[0039] 2. The starting method for the AC generator power supply is as follows:

[0040] When AC generator 4 is working normally, AC generator controller 5 controls contactor 6 to be turned on, and AC generator 4 supplies power to the starting busbar 12 on the machine through contactor 6 and three-phase static converter contactor 11.

[0041] When AC generator 4 fails, AC generator controller 5 controls contactor 6 to disconnect, AC generator controller 7 controls contactor 9 to connect, and AC generator 7 supplies power to the starting busbar 12 on the machine through contactor 9, external power contactor 2, and three-phase static converter contactor 11.

[0042] 3. The starting method for a three-phase static converter power supply is as follows:

[0043] When the three-phase static converter 10 receives the control switch signal from the machine, it drives the three-phase static converter contactor 11 to turn on, and the three-phase static converter 10 supplies power to the machine starting busbar 12 through the three-phase static converter contactor 11.

[0044] This invention uses AC ground power, AC generator, and three-phase static converter as starting power supply. As a certain type of engine, using AC power as the starting power supply can meet the starting requirements of helicopter engines under various operating conditions.

[0045] The above description is merely a specific embodiment of the present invention, providing a detailed description of the invention. Parts not covered herein are conventional techniques. However, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A variable frequency AC starting power supply circuit for helicopters, characterized in that: This includes AC ground power supply, AC generator power supply, and three-phase static converter power supply; The AC ground power supply includes an AC external power supply (1), an external power contactor (2), and a busbar power controller (3). The AC external power supply (1) is connected to the external power contactor (2), and the busbar power controller (3) is connected to the external power contactor (2) to control the on / off state of the external power contactor (2). The AC generator power supply includes AC generator No. 1 (4), AC generator No. 1 controller (5), contactor No. 1 (6), AC generator No. 2 (7), AC generator No. 2 controller (8), and contactor No. 2 (9); AC generator No. 1 (4) is connected to contactor No. 1 (6), AC generator No. 1 controller (5) is connected to AC generator No. 1 (4) and contactor No. 1 (6) respectively, and contactor No. 1 (6) is connected to external power contactor (2); The No. 2 alternator (7) is connected to the No. 2 contactor (9), the No. 2 alternator controller (8) is connected to the No. 2 alternator (7) and the No. 2 contactor (9) respectively, and the No. 2 contactor (9) is connected to the external power contactor (2) and the No. 1 contactor (6) respectively. The three-phase static converter power supply includes a three-phase static converter (10), a three-phase static converter contactor (11), and a starting busbar (12). The three-phase static converter contactor (11) is connected to contactor 1 (6) and contactor 2 (9) respectively. The three-phase static converter (10) is connected to the three-phase static converter contactor (11), and the three-phase static converter contactor (11) is connected to the starting busbar (12).

2. The helicopter frequency converter AC starting power supply circuit according to claim 1, characterized in that: The three-phase static converter (10) is connected to the three-phase static converter contactor (11) through one wire to supply power to the three-phase static converter contactor (11), and is connected to the three-phase static converter contactor (11) through another wire to control the on and off of the three-phase static converter contactor (11).

3. The helicopter frequency converter AC starting power supply circuit according to claim 2, characterized in that: The starting power of the three-phase static converter (10) is greater than 30kVA.

4. The helicopter frequency converter AC starting power supply circuit according to claim 2, characterized in that: The starting busbar (12) is connected to the variable frequency AC starter generator controller for controlling the starter generator.

5. The control method for the helicopter frequency converter AC starting power supply circuit according to any one of claims 1-4, characterized in that: The control methods include an AC ground power supply starting method, an AC generator power supply starting method, and a three-phase static converter power supply starting method. The AC ground power supply starting method takes precedence over the AC generator power supply starting method, and the AC generator power supply starting method takes precedence over the three-phase static converter power supply starting method.

6. The control method for the helicopter frequency converter AC starting power supply circuit according to claim 5, characterized in that: The AC ground power supply startup method is as follows: When the airport has AC ground power, the busbar power controller (3) detects that the voltage, frequency and phase sequence of the AC external power supply meet the requirements, and drives the external power contactor (2) to be turned on. After the external power contactor (2) is turned on, it is interlocked with the circuit of contactor 1 (6) and contactor 2 (9), which causes contactor 1 (6) and contactor 2 (9) to be unable to be turned on, so that the AC external power supply (1) supplies power to the onboard starting busbar (12) through the external power contactor (2), contactor 1 (6) and three-phase static converter contactor (11).

7. The control method for the helicopter frequency converter AC starting power supply circuit according to claim 5, characterized in that: The method for starting an alternator is as follows: When the No. 1 AC generator (4) is in normal operation, the No. 1 AC generator controller (5) controls the No. 1 contactor (6) to be turned on, and the No. 1 AC generator (4) supplies power to the machine starting busbar (12) through the No. 1 contactor (6) and the three-phase static converter contactor (11). When AC generator No. 1 (4) fails, AC generator No. 1 controller (5) controls contactor No. 1 (6) to disconnect, AC generator No. 2 controller (8) controls contactor No. 2 (9) to connect, AC generator No. 2 (7) supplies power to the starting busbar (12) on the machine through contactor No. 2 (9), external power contactor (2), and three-phase static converter contactor (11).

8. The control method for the helicopter frequency converter AC starting power supply circuit according to claim 5, characterized in that: The power supply startup method for a three-phase static converter is as follows: When the three-phase static converter (10) receives the control switch signal from the machine, it drives the three-phase static converter contactor (11) to turn on, and the three-phase static converter (10) supplies power to the machine starting busbar (12) through the three-phase static converter contactor (11).

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