EP4658564A1 - Power sharing in an aircraft using centralised control - Google Patents

Abstract

The invention relates to a system (100) for exchanging power in an aircraft, the system comprising: - a voltage bus (160); - a low-pressure electromechanical converter (150BP); - a high-pressure electromechanical converter (150HP); and - for each electromechanical converter (150BP, 150HP): a voltage control module (130BP, 130HP) and a control module (140BP, 140HP) for ensuring that the exchange setpoint (GBP*, GHP*) is observed. The system (100) further comprises a power adjustment module (106) configured, for at least one of the electromechanical converters (150BP, 150HP): to determine a voltage correction (δVBP, δVHP); and to apply, in the voltage control module (130BP, 130HP) associated with the relevant electromechanical converter (150BP, 150HP), the voltage correction (δVBP, δVHP) to a voltage setpoint (VDC*) so that the voltage control module (130BP, 130HP) adjusts the bus voltage (VDC) to the corrected voltage setpoint (VDC*).

Description

Description

TITLE: POWER SHARING IN AN AIRCRAFT USING CENTRALIZED REGULATION

Technical field of the invention

[0001] The present invention relates to a power exchange installation in an aircraft, a propulsion system of an aircraft comprising such an installation, an aircraft comprising such a propulsion system, as well as a corresponding method.

Technology background

[0002] In the context of reducing the ecological footprint of aircraft, electric hybridization appears to be a technological solution making it possible to very significantly improve the environmental performance of aircraft by notably reducing their fuel consumption.

[0003] Thus, power exchange installations in an aircraft are known in the prior art, comprising: a voltage bus designed to present a bus voltage; a so-called low pressure (LP) electromechanical converter designed to exchange power between the voltage bus and a low pressure body of a turbomachine of the aircraft; a so-called high pressure (HP) electromechanical converter designed to exchange power between the voltage bus and a high pressure body of the aircraft turbomachine; and for each electromechanical converter:

• a voltage regulation module, designed to regulate the bus voltage by determining an exchange setpoint for the electromechanical converter considered, and

• a control module for the electromechanical converter considered, designed to control the electromechanical converter considered, so that the electromechanical converter considered complies with the exchange setpoint.

[0004] The voltage bus is generally part of an electrical network of the aircraft, this electrical network may also include sources and/or loads connected to the voltage bus. [0005] In this way, the electromechanical converters form an interface between the HP and LP bodies of the turbomachine and the electrical network of the aircraft.

[0006] To ensure the proper functioning of loads in particular, the bus voltage must remain within a predefined gauge, which is enabled by the bus voltage regulation modules respectively associated with the electromechanical converters.

[0007] These regulation modules can have a zero static bus voltage error, which has the advantage that the bus voltage remains very close to its set point. However, these two bus voltage regulations are independent of each other and can compete, so as to result in a drift in power sharing, with one electromechanical converter exchanging all the power and the other none. .

[0008] One of the solutions proposed in the prior art to this problem is a so-called "decentralized" installation implementing a droop control allowing, by defining appropriate droop coefficients, to define the power sharing between the power exchanged by the low-pressure body and the power exchanged by the high-pressure body. However, the bus voltage regulation modules then have a non-zero static error, so that the bus voltage remains far from its setpoint, which can cause it to go outside the gauge during a power call by a load of the electrical network or during a power supply by a source.

[0009] Furthermore, the control of power sharing depends strongly on the precision of the bus voltage measurement and requires a very precise acquisition chain (<1% error).

[0010] An alternative is that one of the two electromechanical systems must control the bus voltage and the other system must apply a power draw or supply instruction coming from the central computer.

[0011] However, this solution has the disadvantage of not being robust to the loss of the electromechanical system controlling the bus voltage. In fact, the other system can be reconfigured but there will be a loss of the network electrically over a long time. Furthermore, the central computer must permanently send an instruction to the system not carrying out voltage control. [0012] Another solution of the prior art is to propose a so-called “centralized” installation, where an external computer regulates the bus voltage, applies or not a power withdrawal or supply instruction coming from the computer central and distributes the power or torque instructions to the two electromechanical converters.

[0013] This system has the advantage of being robust to the loss of one of the two electromechanical converters. The two electromechanical converters can then control the voltage and share the power to be drawn.

[0014] However, the dependence between the centralized computer and the two electromechanical converters requires the addition of fast communication (greater than 10kHz).

[0015] Furthermore, the Japanese patent application published under number JP 2014 131469 A describes two generators coupled to a turbomachine, and two regulators for respectively regulating these two generators. Each regulator is designed to receive a power ratio setpoint and the ratio of the current supplied by the associated generator to the total current supplied by the two generators. This ratio is calculated from measurements of the current supplied by each of the generators. Each regulator is thus designed to provide, to the associated generator, a voltage reference that the generator must provide, calculated by the value of a calibrated resistance in an output filter, which requires precise knowledge of this resistance value, which is difficult to be obtained due in particular to variations in the environment (temperature, etc.). US Patent 11,355,929 is substantially similar, except that it does not describe the precise operation of the regulators and that the current ratio is calculated from measurements of the current supplied by the associated generator and measurements of the total current supplied by the two generators.

[0016] It may thus be desired to provide one which makes it possible to overcome at least part of the aforementioned problems and constraints.

Summary of the invention

[0017] A power exchange installation is therefore proposed in an aircraft, comprising: a voltage bus designed to present a bus voltage; a so-called low pressure electromechanical converter designed to exchange power between the voltage bus and a low pressure body of a turbomachine of the aircraft; a so-called high-pressure electromechanical converter designed to exchange power between the voltage bus and a high-pressure body of the aircraft turbomachine; and for each electromechanical converter:

• a voltage regulation module, designed to regulate the bus voltage by determining an exchange setpoint for the electromechanical converter considered, and

• a control module designed to control the electromechanical converter considered, so that the electromechanical converter considered complies with the exchange instruction; characterized in that it further comprises a power adjustment module designed, for at least one of the electromechanical converters, to: determine a voltage correction; and applying, in the voltage regulation module associated with the electromechanical converter considered, the voltage correction to a voltage setpoint so that the voltage regulation module regulates the bus voltage to the corrected voltage setpoint.

[0018] Thus, thanks to the invention, it is possible, on the one hand, to implement decentralized voltage regulation, that is to say split on the two electromechanical converters. This allows robustness in the event of loss or failure of regulation on one side. On the other hand, the power exchanged by each of the electromechanical converters can be controlled centrally. This makes it possible to avoid a drift in power sharing (which could result in the supply of power by only one side) and also to define the power(s) exchanged according to the needs of the turbomachine.

[0019] Furthermore, passing through a voltage correction applied in the voltage regulation module makes it possible to provide a low voltage correction update frequency, which avoids the need for rapid communication. [0020] Furthermore, the fact of applying a correction to a voltage reference allows that in the event of a breakdown of the power adjustment module such that it no longer provides a correction (equivalent to a zero correction) , the voltage regulation module automatically continues to operate by regulating the voltage to the voltage setpoint. This prevents the fault from spreading.

[0021] A power exchange installation according to the invention may also include one or more of the following optional characteristics, according to any technically possible combination.

[0022] Optionally, the exchange setpoint is a power setpoint to be exchanged between the electromechanical converter considered and the voltage bus.

[0023] Also optionally, the exchange setpoint is a setpoint for a current to be exchanged between the electromechanical converter considered and the voltage bus or, the electromechanical converters each comprising an electrical machine coupled to the associated body, the setpoint exchange is a torque setpoint for the electric machine.

[0024] Also optionally, the power adjustment module of the turbomachine comprises: a variation calculation module designed to determine a power correction to be exchanged by the electromechanical converter considered; and a corrector designed to determine the voltage correction from the power correction to be exchanged.

[0025] Also optionally, the corrector has zero static error.

[0026] Also optionally, the voltage correction is determined to regulate an operating characteristic of the turbomachine to a set point.

[0027] Also optionally, the voltage correction is determined from a measurement of the operating characteristic and the operating characteristic setpoint.

[0028] Also optionally, the power adjustment module further comprises a setpoint determination module designed to determine a so-called direct exchange setpoint, and the installation further comprises, for the electromechanical converter considered, a selection module designed for, on control, receive the direct exchange instruction and provide the latter to the control module of the electromechanical converter considered, instead of the exchange instruction provided by the voltage regulation module, so that the electromechanical converter considered respects the direct instruction exchange.

[0029] Also optionally, the installation comprises local computers, respectively low pressure and high pressure, independent of each other, and respectively coupled to the low pressure and high pressure electromechanical converters, each local computer implementing at least the regulation modules of the bus voltage and control voltage of the electromechanical converter considered.

[0030] Also optionally, the installation includes a central computer implementing at least the power adjustment module.

[0031] Also optionally, the central computer is independent of the local computers.

[0032] Also optionally, the voltage regulation module is designed to implement voltage regulation at a voltage regulation frequency, and the power adjustment module is designed to update the voltage correction at a frequency lower than the regulation frequency, preferably at a frequency ten times lower.

[0033] A propulsion system of an aircraft comprising a turbomachine and an installation according to the invention is also proposed.

[0034] An aircraft is also proposed comprising a propulsion system according to the invention.

[0035] A method of power exchange in an aircraft is also proposed, characterized in that it comprises: for each of a so-called low pressure electromechanical converter and a so-called high pressure electromechanical converter, the low electromechanical converter pressure being designed to exchange power between a voltage bus designed to present a bus voltage and a low pressure body of a turbomachine of the aircraft, the high pressure electromechanical converter being designed to exchange power between the pressure bus voltage and a high pressure body of the aircraft turbomachine: • regulation of the bus voltage by determining an exchange setpoint for the electromechanical converter considered, and

• a control of the electromechanical converter considered, so that the electromechanical converter considered complies with the exchange instruction; and for at least one of the electromechanical converters:

• a determination of a voltage correction, and

• an application of the voltage correction to a voltage setpoint so that the bus voltage is regulated at the corrected voltage setpoint.

[0036] There is also proposed a computer program downloadable from a communications network and/or recorded on a computer-readable medium, characterized in that it comprises instructions for executing the steps of a method of power exchange in an aircraft according to the invention, when said program is executed on a computer.

Brief description of the figures

[0037] The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawings in which: Figure 1 is a simplified view of an installation according to the invention of power exchange in an aircraft, Figure 2 is a functional view of the bus voltage regulation module of the high pressure converter coupled to a control module of said converter, to provide the power setpoint, Figure 3 is a functional view of the bus voltage regulation module of the low pressure converter coupled to a control module of said converter, to provide the power setpoint... Figure 4 is a functional view of the control module of the high pressure converter, to regulate the power exchanged by said converter to the power setpoint supplied by the voltage regulator of said converter, Figure 5 is a functional view of the control module of the low pressure converter, to regulate the power exchanged by said converter to the power setpoint supplied by the voltage regulator of said converter, Figure 6 is a simplified view of the installation according to the invention, with selection modules for direct application of power instructions to be shared, and Figure 7 is a functional view of a power exchange method in an aircraft.

Detailed description of the invention

With reference to Figure 1, an example of a propulsion system 98 of an aircraft, in which the invention is implemented, will now be described.

[0039] The propulsion system 98 firstly comprises a turbomachine 102 comprising a low pressure body 104 and a high pressure body 103. The turbomachine 102 is for example a propulsion turbomachine of the aircraft.

The propulsion system 98 further comprises a power exchange installation 100.

[0041] The installation 100 comprises a voltage bus 160, as well as for example at least one electrical load 14, 15 connected to the voltage bus 160. Each load 14, 15 corresponds for example, and in a non-limiting manner, to a or several pieces of equipment on the aircraft. In operation, the voltage bus 160 has a continuous bus voltage VDC.

[0042] The installation 100 further comprises an electromechanical converter 150BP, described as low pressure, designed to exchange power PBP between the voltage bus 160 and the low pressure body 104. Thus, the low pressure electromechanical converter 150BP is by example designed, in a first direction of power transfer, to take mechanical power from the low pressure body 104, in order to supply electrical power to the voltage bus 160. The low pressure electromechanical converter 150BP is also designed, for example, in a second direction of power transfer, to take electrical power from the voltage bus 160 in order to supply mechanical power to the low pressure body 104. To exchange the power PBP, a current IBP is thus exchanged between the voltage bus 160 and the low pressure electromechanical converter 150BP.

[0043] Similarly, for the high pressure body 103, the installation 100 further comprises a 150HP electromechanical converter, qualified as high pressure, designed to exchange PHP power between the voltage bus 160 and the high pressure body 103 Thus, the 150HP high pressure electromechanical converter is for example designed, in a first direction of power transfer, to take mechanical power from the high pressure body 103, in order to supply electrical power to the voltage bus 160. The converter. high pressure electromechanical 150HP is furthermore designed, for example, in a second direction of power transfer, to take electrical power from the voltage bus 160 in order to supply mechanical power to the high pressure body 103. To exchange the PHP power, a current IHP is thus exchanged between the voltage bus 160 and the high pressure electromechanical converter 150HP.

[0044] For example, each electromechanical converter 150BP, 150HP comprises an electrical machine coupled to the low pressure body 104 or high pressure 103, respectively, as well as an AC-DC converter designed to transfer electrical power between the voltage bus 160 and the electric machine. Thus, the electrical machine can receive a mechanical torque to generate an alternating current which is rectified by the alternating-direct converter to provide the bus voltage VDC. The AC-DC converter can also convert the VDC voltage to supply alternating current to the electrical machine so that the latter provides mechanical torque to inject power into the turbomachine 102.

[0045] The installation 100 further comprises, for each electromechanical converter 150BP, 150HP, a voltage regulation module 130BP, 130HP designed to regulate the bus voltage VDC to a voltage setpoint VDC*, the same for the two modules 130BP, 130HP. Each voltage regulation module 130BP, 130HP is in particular designed to determine an exchange setpoint, denoted GBP*, GHP*, of a physical quantity of the electromechanical converter 150BP, 150HP considered, in order to regulate the bus voltage VDC, this physical quantity being linked to the power exchanged PBP, PHP. Indeed, the injection of electrical power into the voltage bus 160 tends to increase the bus voltage VDC, while the withdrawal of electrical power from the voltage bus 160 tends to reduce the bus voltage VDC. Thus, by varying the exchange setpoint GBP*, GHP*, it is possible to modify the power exchanged PBP, PHP to ensure that the electromechanical converter 150BP, 150HP considered injects or draws more or less electrical power and therefore modifies the bus voltage VDC.

The exchange setpoint GBP*, GHP* is, for example, a power setpoint to be exchanged PBP*, PHP* by the electromechanical converter 150BP, 150HP considered, as indicated in parentheses in Figure 1.

[0047] Alternatively, the exchange instruction GBP*, GHP* may be an instruction of the current l _B p, IHP between the electromechanical converter considered 150BP, 150HP and the voltage bus 160. Indeed, when the instruction VDC* is constant, the bus voltage VDC which is regulated to this instruction VDC* also remains substantially constant, so that the current l _B p, IHP directly represents the exchanged power PBP, PHP.

[0048]Alternatively, the exchange setpoint GBP*, GHP* can be a setpoint for the torque of the electric machine.

[0049] The installation 100 further comprises two control modules 140BP, 140HP designed to control the low pressure electromechanical converter 150BP, respectively high voltage 150HP, in order to regulate the physical quantity at its exchange setpoint GBP*, respectively GHP* .

[0050] The installation 100 further comprises a power adjustment module 106 designed to adjust the power exchanged PBP, PHP by at least one of the electromechanical converters 150BP, 150HP, for example both as in the example illustrated. For this, the power adjustment module 106 is designed to apply, for at least one of the electromechanical converters 150BP, 150HP, in the voltage regulation module 130BP, 130HP, a voltage correction 5VBP, 5VHP.

[0051] The voltage correction 5VBP, 5VHP is for example determined to make it possible to regulate an operating characteristic of the turbomachine 102 to a set point Var*. For example and in a non-limiting manner, the operating characteristic may include one or more of: the fuel inlet flow rate and/or the air inlet flow rate, a rotation speed of the low pressure body 104, a speed rotation of the high pressure body 103, an air inlet temperature and/or fuel inlet and/or exhaust gas leaving the combustion chamber. For example, the voltage correction 5VBP, 5VHP is determined from a Var measurement of the operating characteristic and the Var* reference of the operating characteristic.

[0052] The power adjustment module 106 is also configured, for example, to define a threshold value for the voltage corrections 5VBP, 5VHP in order to prevent, for example, a loss of stability in the voltage regulation. For example, and in a non-limiting manner, said threshold value can be between 1% and 10% of the VDC bus voltage.

[0053] To determine the voltage correction 5VBP, 5VHP, the power adjustment module 106 can for example firstly comprise a variation calculation module 108 designed to determine a power correction to be exchanged 5PBP, 5PHP by the electromechanical converter 150BP, 150HP considered, for example from a comparison between the measurement Var of the operating characteristic and the setpoint Var* of the operating characteristic. The power adjustment module 106 may also include a corrector 11 OBP, 11 OHP designed to determine the voltage correction 5VBP, 5VHP from the power correction to be exchanged 5PBP, 5PHP. The use of a corrector avoids the problems associated with the use of a resistance value in the patent application JP 2014 131469 A discussed previously.

[0054] In a non-limiting example, the turbomachine 102 can request power during takeoff of the aircraft to accelerate the rotation of the high pressure body 103. A minimum rotation speed N2 _m in of the body can be defined. high pressure 103 so that takeoff is effective. In this case, the variation calculation module 108 can determine a power correction to be exchanged 5PHP which is not zero (5PHP 0) for the electromechanical converter HP and a power correction to be exchanged 5PBP which is zero (5PBP = 0) for the converter electromechanical BP. The 11 OHP corrector associated with the HP electromechanical converter will then calculate the 5VHP voltage correction to be applied so that the HP electromechanical converter can inject power to the HP body of the turbomachine by taking electrical power from the voltage bus 160 in order to provide mechanical power to the HP body. This will have the effect of increasing the rotation speed so as to respect the minimum rotation speed setpoint N2 _m in. Preferably, the corrector 110BP, 110HP has zero static error. For example, the 110BP, 110HP corrector is of the PI (proportional-integral) or PID (proportional-integral-derivative) type, for example with an “anti-windup” command in order to prevent performance degradation or loss of stability in the voltage or power regulation of the installation 100, which can be generated by the definition of the threshold value for the voltage corrections 5VBP, 5VHP..

[0056] Still with reference to Figure 1, the installation 100 may include independent local CLBP and HPLC computers, respectively associated with the low pressure converter 150BP and the high pressure electromechanical converter 150HP.

[0057] Each local computer CLBP, CLHP thus implements at least the voltage regulation module 130BP, 130HP and the control module 140BP, 140HP of the associated electromechanical converter 150BP, 150HP. This allows the use of a reduced number of calculators. Each local computer CLBP, CLHP can also implement the corrector 11 OBP, 11 OHP of the associated electromechanical converter 150BP, 150HP.

[0058] The installation 100 further comprises, for example, a central calculator CC, independent of the local calculators CLBP, CLHP, designed to implement the variation calculation module 108. The central calculator CC can also implement one or the two correctors 11 OHP, 11 OBP.

[0059] In the illustrative example of Figure 1, the central computer CC implements the entire power adjustment module 106, that is to say the variation calculation module 108 and the two correctors 11 OHP, 11 OBP.

[0060] With reference to Figure 2, the 130HP voltage regulation module comprises for example a 300HP comparator, designed to calculate a difference AVDC, HP between the voltage setpoint VDC* corrected by the voltage correction 5VHP, and the voltage VDC bus: AVDC, HP ⁼ VDC* - 5VHP - VDC.

[0061] The comparator 300HP can alternatively be configured to calculate a difference AV ² DC, HP between the square of the voltage setpoint VDC* corrected by the voltage correction 5VHP, and the square of the bus voltage VDC: AV ² DC , HP = (VDC* - 5VHP) ² - V ² DC.

[0062] The 130HP voltage regulation module further comprises, for example, a 301 HP corrector designed to determine the GHP* exchange setpoint, for example the power setpoint to be exchanged PHP*, from the difference AVDC, HP OR AV ² DC, HP. Preferably, the corrector is zero static error. For example, the 301 HP corrector is of the PI (proportional-integral) or PID (proportional-integral-derivative) type.

[0063] Similarly, with reference to Figure 3, the voltage regulation module 130BP comprises for example a comparator 300BP and a corrector 301 BP.

[0064] The presence of zero static error correctors in the local CLBP, CLHP computers can lead to a divergence in power sharing, with one of the electromechanical converters BP or HP taking all the power. In order to control the power sharing between the electromechanical converters BP and HP, the central computer CC can be designed to send voltage corrections 5VBP, 5VHP to the local computers CLBP, CLHP to achieve balancing of the powers exchanged PBP, PHP.

[0065] Each voltage regulation module 130BP, 130HP can also be designed to implement voltage regulation at a voltage regulation sampling frequency, for example 10 kHz.

[0066] In order to stabilize the power exchanges of the installation 100, the power adjustment module 106 is preferably designed to update the voltage correction 5VBP, 5VHP at a frequency lower than the regulation frequency, of preferably at a frequency ten times lower. Indeed, in order not to disturb the voltage regulation and to allow the latter time to regulate the voltage, it is preferable that the voltage correction 5VBP, 5VHP be kept constant over several voltage regulation cycles. For example and without limitation, the voltage correction can be updated at frequencies lower than 1 kHz. Thus, it is not necessary to provide rapid communication (for example greater than 1 kHz) between the power adjustment module 106 and the voltage regulation modules 130HP, 130BP. With the previous implementation in the central computer CC and the local computer(s) CLBP, CLHP, it is therefore not necessary to provide rapid communication between the central computer CC and the local computer(s) CLBP, CLHP.

[0067] It will be appreciated that the installation 100 is thus designed to be able to operate with active balancing (of power and/or voltage) on one side only, which makes it possible to ensure redundancy in the event of loss of power. communication between the central computer CC and one of the local computers CLBP, CLHP. [0068] With reference to Figure 4, the 140HP control module comprises for example a 400HP block designed to determine a setpoint of at least one current of the electromechanical converter 1 50HP, this or these currents defining the power exchanged. For example, these are phase currents IA.HP, IB.HP, IC.HP for example for three phases of the electric machine, expressed in a rotating frame provided with a direct axis and a quadrature axis by direct and quadrature currents. Thus, the 400HP block is for example designed to determine a direct current setpoint ID.HP* and a quadrature counterpoint setpoint IQ,HP*. This determination is for example carried out from an angular position 0HP and a rotation speed CÜHP of a rotor of the electric machine and the bus voltage VDC-

[0069] The angular position 0HP and the rotation speed CÜHP of the rotor of the electric machine make it possible in particular to express the electrical quantities, such as the phase currents IA.HP, IB.HP, IC.HP, in the rotating reference frame . As for the VDC bus voltage, it makes it possible to modulate phase currents or determine the direct current setpoint ID.HP* via a defluxing method.

[0070] The 140HP control module further comprises, for example, a current regulation block 401 HP designed to provide commands to the high pressure electromechanical converter 150HP based on the current setpoint(s) IDHP*, IQHP* and a measurement of this or these currents, for example the phase currents IA,HP, IB.HP, IC.HP for three phases A, B, and C. The controls are for example PWMBP pulse width modulation controls, PWMHP.

[0071] Similarly, with reference to Figure 5, the control module 140BP comprises for example a block 400BP designed to determine a setpoint of at least one current of the low pressure electromechanical converter 150BP, this or these currents defining the power exchanged. For example, these are phase currents of the electrical machine, expressed by direct and quadrature currents. Thus, the 400BP block is designed to determine a direct current setpoint I D, BP* and a quadrature contratant setpoint IQ, BP*. This determination is for example carried out from an angular position 0BP and a rotation speed CÜBP of a rotor of the electric machine and the bus voltage VDC.

[0072] The control module 140BP further comprises, for example, a current regulation block 401 BP designed to provide commands to the low-pressure electromechanical converter 150BP from the current setpoint(s). ID, BP*, IQ.BP* and a measurement of this or these currents, for example phase currents IA,BP, IB.BP, le, BP for three phases A, B, and C. The commands are for example pulse width modulation commands PWMBP, PWMHP.

[0073] With reference to Figure 6, the installation 100 may also include a setpoint determination module 109 designed to determine, for one or both electromechanical converters 150BP, 150HP, an exchange setpoint G' BP, G'HP, called direct. The setpoint determination module 109 can, for example, be implemented by the central computer CC.

[0074] In this case, the installation 100 may also include, for each electromechanical converter 1 50BP, 150HP, a selection module 1 70BP, 170HP designed to directly receive the direct exchange instruction G'BP, G'HP for the electromechanical converter 1 50BP, 150HP considered, for example from the central computer CC. The selection module 1 70BP, 1 70HP is also designed to provide the direct exchange setpoint G'BP, G'HP directly to the control module 140BP, 140HP, in place of the exchange setpoint GBP*, GHP * supplied by the voltage regulation module 1 30BP, 1 30HP. This supply is done selectively, that is to say for example on receipt of a PSBP Mode, PSHP Mode command, for example coming from the setpoint determination module 109. Thus, the power exchanged PBP, PHP by each electromechanical converter 1 50HP is directly regulated according to the associated direct exchange setpoint G'BP, G'HP.

[0075] In the example illustrated in Figure 6, only the 170HP selection module is activated.

[0076] The direct supply of the direct exchange setpoint G'BP OR G'HP, without going through the calculation of a voltage correction, makes it possible to define the power exchanges in operating phases where the calculation of A voltage correction is not suitable, for example when we want the power exchange on one side to be fixed and the exchange on the other side arbitrary. In addition, the direct provision of the direct exchange instruction G'BP OR G'HP allows this instruction to be applied more quickly, which is useful for example in the event of assistance.

[0077] On the side where the selection module 1 70HP, 170BP is activated, the regulation of the bus voltage is no longer carried out. In this situation, voltage regulation of the bus voltage VDC is then carried out on the other side. [0078] With reference to Figure 7, an example of a power exchange method 700 according to the invention will now be described.

[0079] The method 700 comprises, for at least one of the electromechanical converters 150BP, 150HP, the following steps 702, 704.

[0080] During step 702, the voltage correction 5VBP, 5VHP is determined by the power adjustment module 106.

[0081] During step 704, the power adjustment module 106 applies, in the voltage regulation module 130BP, 130HP associated with the electromechanical converter 150BP, 150HP considered, the voltage correction 5VBP, 5VHP to the voltage reference VDC*.

[0082] The method 700 further comprises, for each of the low pressure electromechanical converter 150BP and the high pressure electromechanical converter 150HP, the following steps 706, 708.

[0083] During step 706, the voltage regulation module 130HP, 130BP regulates the bus voltage VDC to the voltage setpoint VDC* corrected if necessary by the voltage correction 5VBP, 5VHP, by determining the setpoint exchange rate GBP*, GHP* for the 150BP, 150HP electromechanical converter considered.

[0084] During step 708, the control module 140HP, 140BP controls the electromechanical converter 150BP, 150HP considered, so that the electromechanical converter 150BP, 150HP considered respects the exchange instruction GBP*, GHP*.

[0085] In conclusion, it should be noted that the invention is not limited to the embodiments described above. It will indeed appear to those skilled in the art that various modifications can be made to the embodiments described above, in light of the teaching which has just been disclosed to him.

[0086] In the detailed presentation of the invention which is made previously, the terms used must not be interpreted as limiting the invention to the embodiments set out in the present description, but must be interpreted to include all the equivalents of which prediction is within the reach of those skilled in the art by applying their general knowledge to the implementation of the teaching which has just been disclosed to them.

Claims

Claims [1] Installation (100) for power exchange in an aircraft, comprising: a voltage bus (160) designed to present a bus voltage (VDC); an electromechanical converter (150BP) called low pressure (LP) designed to exchange power (PBP) between the voltage bus (160) and a low pressure body (104) of a turbomachine (102) of the aircraft; an electromechanical converter (150HP) called high pressure (HP) designed to exchange power (PHP) between the voltage bus (160) and a high pressure body (103) of the turbomachine (102) of the aircraft; and for each electromechanical converter (150BP, 150HP): • a voltage regulation module (130BP, 130HP), designed to regulate the bus voltage (VDC) by determining an exchange setpoint (GBP*, GHP*) for the electromechanical converter (150BP, 150HP) considered, and • a control module (140BP, 140HP) designed to control the electromechanical converter (150BP, 150HP) considered, so that the electromechanical converter (150BP, 150HP) considered complies with the exchange setpoint (GBP*, GHP*); characterized in that it further comprises a power adjustment module (106) designed, for at least one of the electromechanical converters (150BP, 150HP), to: determine a voltage correction (5VBP, 5VHP); and apply, in the voltage regulation module (130BP, 130HP) associated with the electromechanical converter (150BP, 150HP) considered, the voltage correction (5VBP, 5VHP) to a voltage setpoint (VDC*) so that the voltage regulation module voltage regulation (130BP, 130HP) regulates the bus voltage (VDC) to the corrected voltage setpoint (VDC*). [2] Power exchange installation (100) according to claim 1, in which the exchange setpoint (GBP*, GHP*) is a power setpoint to be exchanged (PBP*, PHP*) between the electromechanical converter ( 150BP, 150HP) considered and the voltage bus (160). [3] Power exchange installation (100) according to claim 1, in which the exchange setpoint (GBP*, GHP*) is a setpoint for a current (l _B p, IHP) to be exchanged between the converter electromechanical converter (150BP, 150HP) considered and the voltage bus (160) or else, the electromechanical converters (150BP, 150HP) each comprising an electrical machine coupled to the associated body (103, 104), the exchange setpoint (GBP *, GHP*) is a torque setpoint for the electric machine. [4] Power exchange installation (100) according to any one of claims 1 to 3, in which the power adjustment module (106) of the turbomachine (102) comprises: a variation calculation module ( 108) designed to determine a power correction to be exchanged (5PBP, 5PHP) by the electromechanical converter (1 30BP, 1 30HP) considered; and a corrector (110BP, 110HP) designed to determine the voltage correction (5VBP, 5VHP) from the power correction to be exchanged (5PBP, 5PHP). [5] Power exchange installation (100) according to claim 4, in which the corrector (110BP, 110HP) has zero static error. [6] Power exchange installation (100) according to any one of claims 1 to 5, in which the voltage correction (5VBP, 5VHP) is determined to regulate an operating characteristic of the turbomachine (102) at a setpoint (Var*). [7] Power exchange installation (100) according to claim 6, in which the voltage correction (5VBP, 5VHP) is determined from a measurement (Var) of the operating characteristic and the setpoint (Var *) of the operating characteristic. [8] Power exchange installation (100) according to any one of the preceding claims, in which the power adjustment module (106) further comprises a setpoint determination module (109) designed to determine a setpoint exchange (G'BP, G'HP), called direct, and further comprising, for the electromechanical converter (150BP, 150HP) considered, a selection module (1 70BP, 170HP) designed to, on command, receive the direct exchange setpoint (G'BP, G'HP) and provide the latter to the control module (140BP, 140HP) of the electromechanical converter (150BP, 150HP) considered, instead of the exchange setpoint (GBP*, GHP*) provided by the voltage regulation module (130BP, 130HP), so that the electromechanical converter (150BP, 150HP) considered respects the direct exchange instruction (G'BP, G'HP). [9] Power exchange installation (100) according to any one of the preceding claims, comprising local calculators, respectively low pressure (CLBP) and high pressure (CLHP), independent of each other, and respectively coupled to the low electromechanical converters pressure (150BP) and high pressure (150HP), each local computer implementing at least the regulation modules (130BP, 130HP) of the voltage bus voltage and control (140BP, 140HP) of the electromechanical converter (150BP, 150HP) considered. [10] Power exchange installation (100) according to any one of the preceding claims, comprising a central computer (CG) implementing at least the power adjustment module (106). [11] Power exchange installation (100) according to claims 9 and 10, in which the central computer (CC) is independent of the local computers (CLBP, CLHP). [12] Power exchange installation (100) according to any one of the preceding claims, in which the voltage regulation module (130BP, 130HP) is designed to implement voltage regulation at a regulation frequency of voltage, and in which the power adjustment module (106) is adapted to update the voltage correction at a frequency lower than the regulation frequency, preferably at a frequency ten times lower. [13] Propulsion system (98) of an aircraft comprising a turbomachine (102) and an installation (100) according to any one of claims 1 to 12. [14] Aircraft comprising a propulsion system (98) according to the preceding claim. [15] Method (500) for exchanging power in an aircraft, characterized in that it comprises: for each of an electromechanical converter (150BP) called low pressure (BP) and an electromechanical converter (150HP) called high pressure (HP), the low pressure electromechanical converter (150BP) being designed to exchange power (PBP) between a voltage bus (160) designed to have a bus voltage (VDC) and a low pressure body (104) of a turbomachine (102) of the aircraft, the high pressure electromechanical converter (150HP) being designed to exchange power (PHP) between the voltage bus (160) and a high pressure body (103) of the turbomachine (102) of the aircraft: • regulation (800) of the bus voltage (VDC) by determining an exchange setpoint (GBP*, GHP*) for the electromechanical converter (150BP, 150HP) considered, and • a command (801) of the electromechanical converter (150BP, 150HP) considered, so that the electromechanical converter (150BP, 150HP) considered complies with the exchange instruction (GBP*, GHP*); and for at least one of the electromechanical converters (150BP, 150HP): • a determination (802) of a voltage correction (5VBP, 5VHP), and • an application (803) of the voltage correction (5VBP, 5VHP) to a voltage reference (VDC*) so that the bus voltage (VDC) is regulated to the corrected voltage reference (VDC*). [16] Computer program downloadable from a communications network and/or recorded on a computer-readable medium, characterized in that it includes instructions for executing the steps of a power exchange process in a aircraft according to the preceding claim, when said program is executed on a computer.