Power sharing in an aircraft using centralised control

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 CONTROL 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. Technological background

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

[0003] Thus, power exchange installations in an aircraft are known in the prior art, comprising: a voltage bus designed to have a bus voltage; an electromechanical converter called low pressure (LP) designed to exchange power between the voltage bus and a low pressure body of a turbomachine of the aircraft; an electromechanical converter called high pressure (HP) designed to exchange power between the voltage bus and a high pressure body of the turbomachine of the aircraft; and for each electromechanical converter: • a voltage regulation module, designed to regulate the bus voltage by determining an exchange setpoint for the electromechanical converter in question, and • a control module for the electromechanical converter in question, designed to control the electromechanical converter in question, so that the electromechanical converter in question complies with the exchange instruction.

[0004] The voltage bus is generally part of an aircraft electrical network, which electrical network may further 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 aircraft's electrical network.

[0006] To ensure the proper functioning of loads in particular, the bus voltage must remain within a predefined range, which is made possible by the bus voltage regulation modules 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 setpoint. However, these two bus voltage regulations are independent of each other and can compete, leading to a power sharing drift, 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 which, by defining appropriate droop coefficients, allows the power sharing between the power exchanged by the low-pressure body and the power exchanged by the high-pressure body to be defined. 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 lead it to go outside the gauge during a power call by a load from the electrical network or during a power supply by a source.

[0009] Furthermore, controlling power sharing depends heavily on the accuracy 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 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. Indeed, the other system can reconfigure itself but there will be a loss of network electrically over a long period of time. Furthermore, the central computer must constantly send an instruction to the system not performing 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 central computer 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 dependency 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 setpoint that the generator must supply, calculated by the value of a calibrated resistor in an output filter, which requires precise knowledge of this resistance value, which is difficult to obtain 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 therefore be desirable to provide one which allows one to overcome at least some of the aforementioned problems and constraints. Summary of the invention

[0017] There is therefore proposed a power exchange installation in an aircraft, comprising: a voltage bus designed to have 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 turbomachine of the aircraft; and for each electromechanical converter: • a voltage regulation module, designed to regulate the bus voltage by determining an exchange setpoint for the electromechanical converter in question, and • a control module designed to control the electromechanical converter in question, so that the electromechanical converter in question complies with the exchange setpoint; 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 apply, in the voltage regulation module associated with the electromechanical converter in question, 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, i.e., 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, furthermore, to define the power(s) exchanged according to the needs of the turbomachine.

[0019] Furthermore, by using a voltage correction applied in the voltage regulation module, it is possible to provide a low voltage correction update frequency, which avoids the need for fast communication.

[0020] Furthermore, applying a correction to a voltage setpoint ensures that in the event of a power adjustment module failure so that it no longer provides correction (equivalent to zero correction), the voltage regulation module automatically continues to operate by regulating the voltage to the voltage setpoint. This thus prevents the failure from spreading.

[0021] A power exchange installation according to the invention may further comprise one or more of the following optional features, in any technically possible combination.

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

[0023] Also optionally, the exchange instruction is a current instruction 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 exchange instruction is a torque instruction of the electrical 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 is zero static error.

[0026] Optionally also, the voltage correction is determined to regulate an operating characteristic of the turbomachine to a setpoint.

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

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

[0029] Also optionally, the installation includes 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 voltage bus voltage regulation and control modules of the electromechanical converter in question.

[0030] Optionally, the installation also 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] There is also provided a propulsion system for an aircraft comprising a turbomachine and an installation according to the invention.

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

[0035] There is also proposed a method for exchanging power in an aircraft, 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-pressure electromechanical converter being designed to exchange power between a voltage bus designed to have 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 voltage bus and a high-pressure body of the turbomachine of the aircraft: • regulation of the bus voltage by determining an exchange setpoint for the electromechanical converter considered, and • a command of the electromechanical converter considered, so that the electromechanical converter considered respects the exchange instruction; and for at least one of the electromechanical converters: • a determination of a voltage correction, and • an application of voltage correction to a voltage setpoint so that the bus voltage is regulated to the corrected voltage setpoint.

[0036] There is also provided a computer program downloadable from a communication network and / or recorded on a computer-readable medium, characterized in that it comprises instructions for executing the steps of a power exchange method 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 following description, given solely by way of example and with reference to the appended drawings in which: Figure 1 is a simplified view of an installation according to the invention for exchanging power 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 provided by the voltage regulator of said converter, Figure 5 is a functional view of the control module of the low pressure converter, for regulating 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 setpoints to be shared, and Figure 7 is a functional view of a power exchange method in an aircraft. Detailed description of the invention

[0038] With reference to FIG. 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.

[0040] 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 one or more pieces of equipment of the aircraft. In operation, the voltage bus 160 has a continuous VDC bus voltage.

[0042] The installation 100 further comprises an electromechanical converter 150BP, described as low pressure, designed to exchange PBP power between the voltage bus 160 and the low pressure body 104. Thus, the low pressure electromechanical converter 150BP is for 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 further for example designed, 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 PBP power, a IBP current 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, described 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 power transfer direction, to take mechanical power from the high-pressure body 103, in order to provide electrical power to the voltage bus 160. The 150HP high-pressure electromechanical converter is further for example designed, in a second power transfer direction, to take electrical power from the voltage bus 160 in order to provide mechanical power to the high-pressure body 103. To exchange the PHP power, an IHP current is thus exchanged between the voltage bus 160 and the 150HP high-pressure electromechanical converter.

[0044] For example, each electromechanical converter 150BP, 150HP includes an electrical machine coupled to the low pressure body 104 or high pressure body 103, respectively, as well as an AC-DC converter configured to transfer electrical power between the voltage bus 160 and the electrical machine. Thus, the electrical machine can receive mechanical torque to generate an alternating current which is rectified by the AC-DC converter to provide the bus voltage VDC. The AC-DC converter can further convert the voltage VDC to supply AC 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 VDC bus voltage to a voltage setpoint VDC*, the same for both 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 VDC bus voltage, this physical quantity being linked to the exchanged power PBP, PHP. Indeed, the injection of electrical power into the voltage bus 160 tends to increase the VDC bus voltage, while the withdrawal of electrical power from the voltage bus 160 tends to decrease the VDC bus voltage. Thus, by adjusting the GBP*, GHP* exchange setpoint, it is possible to modify the exchanged power PBP, PHP to ensure that the 150BP, 150HP electromechanical converter in question injects or draws more or less electrical power and therefore modifies the VDC bus voltage.

[0046] The exchange instruction GBP*, GHP* is, for example, a power instruction to be exchanged PBP*, PHP* by the electromechanical converter 150BP, 150HP considered, as indicated in parentheses in figure 1.

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

[0048] Alternatively, the GBP*, GHP* exchange instruction can be a torque instruction 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 to 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 allow an operating characteristic of the turbomachine 102 to be regulated to a setpoint Var*. For example and in a non-limiting manner, the operating characteristic may comprise 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 rotation speed of the high pressure body 103, an air inlet temperature and / or fuel inlet temperature 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* setpoint of the operating characteristic.

[0052] The power adjustment module 106 is further configured, for example, to define a threshold value for the 5VBP, 5VHP voltage corrections 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 may be between 1% and 10% of the VDC bus voltage.

[0053] To determine the voltage correction 5VBP, 5VHP, the power adjustment module 106 may 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 further comprise 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 makes it possible to avoid the problems linked to 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 the takeoff phase of the aircraft to accelerate the rotation of the high-pressure body 103. A minimum rotation speed N2 can be defined. min of the high pressure body 103 so that the takeoff is effective. In this case, the variation calculation module 108 can determine a non-zero power correction to be exchanged 5PHP (5PHP 0) for the HP electromechanical converter and a power correction to be exchanged 5PBP which is zero (5PBP = 0) for the LP electromechanical converter. The corrector 11 OHP associated with the HP electromechanical converter will then calculate the voltage correction 5VHP to be applied so that the HP electromechanical converter can inject power into 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.

[0055] Preferably, the corrector 110BP, 110HP is of zero static error. For example, the corrector 110BP, 110HP is of the PI (proportional-integral) or PID (proportional-integral-derivative) type, for example with an “anti-windup” control in order to prevent performance degradation or loss of stability in the voltage or power regulation of the installation 100, which may be caused by the definition of the threshold value for the voltage corrections 5VBP, 5VHP.

[0056] Still with reference to FIG. 1, the installation 100 may comprise independent local CLBP and CLHP 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 computers. 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 computer CC, independent of the local computers CLBP, CLHP, designed to implement the variation calculation module 108. The central computer CC can further implement one or both correctors 11 OHP, 11 OBP.

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

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

[0061] The 300HP comparator can alternatively be configured to calculate an AV difference 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 also includes, 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 2DC, 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 of the power sharing, with one of the BP or HP electromechanical converters taking all the power. In order to control the power sharing between the BP and HP electromechanical converters, the central CC computer can be designed to send 5VBP, 5VHP voltage corrections to the local CLBP, CLHP computers to achieve a balancing of the exchanged powers PBP, PHP.

[0065] Each 130BP, 130HP voltage regulation module may further 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, preferably at a frequency ten times lower. Indeed, in order not to disturb the voltage regulation and to allow time for the latter to regulate the voltage, it is preferable for the voltage correction 5VBP, 5VHP to be kept constant over several voltage regulation cycles. For example and in a non-limiting manner, 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 fast 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 communication between the central computer CC and one of the local computers CLBP, CLHP.

[0068] With reference to Figure 4, the control module 140HP comprises for example a block 400HP designed to determine a setpoint of at least one current of the electromechanical converter 150HP, this or these currents defining the exchanged power. 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 reference frame provided with a direct axis and a quadrature axis by direct and quadrature currents. Thus, the block 400HP is for example designed to determine a direct current setpoint ID.HP* and a quadrature current 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 allow in particular the expression of electrical quantities, such as the phase currents IA.HP, IB.HP, IC.HP, in the rotating reference frame. As for the bus voltage VDC, it allows the modulation of the phase currents or the determination of the direct current setpoint ID.HP* via a field weakening method.

[0070] The 140HP control module further comprises, for example, a 401 HP current regulation block designed to provide commands to the 150HP high-pressure electromechanical converter from 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 commands are, for example, pulse width modulation commands PWMBP, PWMHP.

[0071] Similarly, with reference to FIG. 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 exchanged power. For example, these are phase currents of the electrical machine, expressed by direct and quadrature currents. Thus, the block 400BP is designed to determine a direct current setpoint ID, BP* and a quadrature current 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 electrical 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 1 50BP 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, Ie, BP for three phases A, B, and C. The commands are for example pulse width modulation commands PWMBP, PWMHP.

[0073] With reference to FIG. 6, the installation 100 may further comprise 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 may, for example, be implemented by the central computer CC.

[0074] In this case, the installation 100 may further comprise, for each electromechanical converter 1 50BP, 150HP, a selection module 1 70BP, 170HP designed to directly receive the direct exchange setpoint G'BP, G'HP for the electromechanical converter 1 50BP, 150HP in question, for example from the central computer CC. The selection module 1 70BP, 1 70HP is further designed to provide the direct exchange setpoint G'BP, G'HP directly to the control module 140BP, 140HP, instead of the exchange setpoint GBP*, GHP* provided by the voltage regulation module 1 30BP, 1 30HP. This supply is done selectively, that is to say for example upon receipt of a Mode PSBP, Mode PSHP 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 shown 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 one wishes the power exchange on one side to be fixed and the exchange on the other side to be arbitrary. In addition, the direct supply of the direct exchange setpoint G'BP OR G'HP makes it possible to apply this setpoint more quickly, which is useful for example in the case of assistance.

[0077] On the side where the 1 70HP, 170BP selection module is activated, bus voltage regulation no longer takes place. In this situation, voltage regulation of the VDC bus voltage 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 setpoint 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 where appropriate by the voltage correction 5VBP, 5VHP, by determining the exchange setpoint GBP*, GHP* for the electromechanical converter 150BP, 150HP 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 complies with the exchange instruction GBP*, GHP*.

[0085] In conclusion, it will 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 them.

[0086] In the detailed presentation of the invention given above, the terms used should not be interpreted as limiting the invention to the embodiments set forth in this description, but should be interpreted to include all equivalents the prediction of which is within the reach of those skilled in the art by applying their general knowledge to the implementation of the teaching just disclosed to them.

Claims

Claims [1] Installation (100) for exchanging power in an aircraft, comprising: a voltage bus (160) designed to have a bus voltage (VDC); an electromechanical converter (150BP) called low pressure (BP) 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) in question, so that the electromechanical converter (150BP, 150HP) in question complies with the exchange instruction (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 applying, 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 (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 instruction (GBP*, GHP*) is a power instruction 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 instruction (GBP*, GHP*) is an instruction of a current (l B p, IHP) to be exchanged between the electromechanical converter (1 50BP, 1 50HP) 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 instruction (GBP*, GHP*) is a torque instruction of the electrical 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) to 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 an exchange setpoint (G'BP, G'HP), called direct, and further comprising, for the electromechanical converter (150BP, 150HP) in question, a selection module (170BP, 170HP) designed to, on command, receive the direct exchange setpoint (G'BP, G'HP) and supply 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 setpoint (G'BP, G'HP). [9] Power exchange installation (100) according to any one of the preceding claims, comprising local computers, respectively low pressure (CLBP) and high pressure (CLHP), independent of each other, and respectively coupled to the low pressure (150BP) and high pressure (150HP) electromechanical converters, 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) in question. [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, wherein the voltage regulation module (130BP, 130HP) is adapted to implement the voltage regulation at a voltage regulation frequency, and wherein 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: • a 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 respects 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 setpoint (VDC*) so that the bus voltage (VDC) is regulated to the corrected voltage setpoint (VDC*). [16] Computer program downloadable from a communication network and / or recorded on a computer-readable medium, characterized in that it comprises instructions for executing the steps of a power exchange method in an aircraft according to the preceding claim, when said program is executed on a computer.

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