Electric mobile compressor

Abstract

The utility model relates to an electric mobile compressor. According to one embodiment, there is disclosed an electrically powered mobile compressor (300) comprising an electric motor (106) for driving a compressor element (107) for supplying compressed gas, and further comprising an electrical connection (108) for an electrical grid, the electric motor (106) being connected to an electrical distribution device (101), the electrical distribution device further comprising: an on-board charger (103) for providing electrical power to the electrical distribution device (101); a battery management system (104) for supporting power exchange between the power distribution device (101) and the rechargeable batteries (109, 202); and a controller (100) configured to coordinate power exchange between the power grid (108), the components of the one or more rechargeable batteries (109, 202), and the electric motor (106); wherein, when the required power of the electric motor (102) exceeds the available power from the electrical grid (108), the available power is supplemented with power from the battery (109, 202).

Description

Technical Field

[0001] The utility model relates to an electric compressor and a method for controlling the electric compressor. Background Art

[0002] A compressor is a machine designed to produce compressed gas, such as compressed air. The compressed gas at a certain working pressure is then used in a range of applications, such as powering other machines, such as pneumatic jackhammers and drills.

[0003] Such jackhammers and drilling rigs are often used at locations where there is no permanent compressed air network, such as construction sites. Usually, mobile compressors are used at these locations. The term "mobile" is therefore understood to mean that such compressors can be moved with or without the aid of transport means and / or lifting means. In other words, a mobile compressor is a compressor that is not designed for stationary use at a fixed location.

[0004] Mobile compressors can be driven by diesel engines, so that they can operate independently. However, since they emit combustion gases and are noisy, there is a trend to replace these diesel engines with electric motors. Then, there must be an electrical grid for driving the electric motor.

[0005] Such an electric mobile compressor is disclosed in BE1024040A1. The mobile compressor is equipped with a control unit to limit the maximum current consumed to an adjustable maximum value. This prevents an overload of the power grid to which the mobile compressor is connected.

[0006] As further disclosed in BE1024040A1, the energy supply from the grid can be further supplemented with a battery pack. When the electric mobile compressor is not started but connected to the grid, the battery can be charged. When the electric mobile compressor is running, the electric mobile compressor can draw electrical power from the grid. If the grid were to fail, the operation can be continued using the power that can be drawn from the charged battery.

[0007] However, if the power required by the motor exceeds the power available from the grid, the current drawn from the grid will be higher than the grid is rated for and therefore protected against. If the overcurrent protection is functioning correctly, the compressor will shut down immediately by shutting down the motor. However, this sudden shutdown can create a dangerous situation, as the operator usually cannot anticipate this. In addition, if the overcurrent protection is not functioning properly, the excessive load can cause damage to the grid.

[0008] A disadvantage of the electric mobile compressors and associated methods known in the prior art is that the existing power grid is a limiting factor. In other words, the application in which the compressed gas will be used is limited by the power available from the grid. However, this available power is usually a fixed value and cannot be easily increased.

[0009] Therefore, it is an object of the present invention to provide a device and a method that overcomes one or more of the described disadvantages of prior art solutions. More specifically, it is an object of the present invention to provide a device and a method that result in a greater available power for an electrically powered mobile compressor. Utility Model Content

[0010] One aspect of the present application discloses an electric mobile compressor (300), characterized in that the mobile compressor comprises an electric motor (106) for driving a compressor element (107), the compressor element being used to supply compressed gas at a predefined pressure and / or flow rate, the compressor (300) further comprising an electrical connection (108) for a power grid, the electric motor (106) being connected to a power distribution device (101), the power distribution device (101) further comprising: an onboard charger (103), the onboard charger being configured to provide electrical power from the power grid (108) to the power distribution device (101); and a battery management system (104), the battery management system A power distribution device (101) is configured to support power exchange between components of the power distribution device (101) and one or more rechargeable batteries (109, 202); a controller (100), the controller being configured to coordinate power exchange between the power grid (108), components of the one or more rechargeable batteries (109, 202) and the motor (106); wherein the controller (100) is further configured to control the battery management system (104) so ​​that when the required power of the motor (102) exceeds the available power from the power grid (108), the available power is supplemented by power from components of the one or more rechargeable batteries (109, 202).

[0011] According to at least one embodiment of the present application, the controller (100) is also configured to use the battery management system (104) to determine a charge state of a component of the one or more rechargeable batteries (109, 202) indicating remaining power, and wherein the available power is replenished as long as the charge state is above a first predefined value.

[0012] According to at least one embodiment of the present application, the controller is further configured to limit the power required by the electric motor (102) when the state of charge is lower than a second predefined value.

[0013] According to at least one embodiment of the present application, the first predefined value is less than or equal to the second predefined value.

[0014] According to at least one embodiment of the present application, the controller is further configured to limit the power required by the motor (102) by limiting a predefined pressure and / or flow rate.

[0015] According to at least one embodiment of the present application, the power distribution device (101) further includes a connection member (201) for an electrical device, and wherein the controller is further configured to limit an electrical demand current (203) of the electrical device when the required power of the motor (102) exceeds the available power from the power grid (108).

[0016] According to the present invention, according to a first aspect of the present invention, the above identified object is achieved by providing a computer-implemented method for controlling an electric mobile compressor according to the first claim, the mobile compressor comprising a compressor element driven by an electric motor for supplying compressed gas at a predefined pressure and / or flow rate, the electric motor being connected to a power distribution device for providing electric current to an electric device, the power distribution device further comprising:

[0017] - an onboard charger configured to provide electrical power from the electrical grid to the power distribution device; and

[0018] - a battery management system configured to support power exchange between the power distribution device and an assembly of one or more rechargeable batteries;

[0019] - a controller configured to coordinate power exchange between the electrical grid, the assembly of one or more rechargeable batteries and the electric motor;

[0020] The method comprises the following steps: when the required power of the electric motor exceeds the available power from the power grid;

[0021] - said available power is supplemented by power from components of said one or more rechargeable batteries.

[0022] The electric mobile compressor is configured to provide compressed air in locations where there is usually no compressed air network available. On the other hand, an electrical grid can be used to power the compressor. The grid is, for example, a low voltage grid at a certain voltage, such as 400V, which is common in Europe, or 480V, which is common in the United States. It should therefore be understood that the value of the voltage to which the mobile compressor can be connected is not restrictive, but can be adapted to the area in which the compressor will be used. Furthermore, the grid is characterized by the available electrical power, which in turn determines the maximum current that can be drawn from the grid in a safe manner.

[0023] The compressor is also equipped with an electric motor for driving the compressor element. For example, when the compressor is a screw compressor type, the compressor element is a screw. It is also further understood here that the type of compressor element is not restrictive and other compressor elements can be used to supply compressed gas at a predefined pressure. The value of this pressure also depends on the intended application and may also be adjustable.

[0024] Furthermore, there is a mechanical coupling between the motor and the driven compressor element (such as a gearbox). In other words, the drive of the compressor element does not have to be driven directly by the motor, but a mechanical coupling between them may also be provided. This will convert the speed of the motor into a speed suitable for the compressor element.

[0025] Furthermore, the type of motor is not limiting for the disclosed utility model. It can be a three-phase asynchronous motor or a three-phase permanent magnet synchronous motor. In these cases, there will be a frequency converter between the power distribution system and the motor. The frequency converter, also known as a frequency controller, inverter or variable speed drive VSD, will then convert the DC voltage from the power distribution device into an AC voltage with a certain frequency suitable for the three-phase motor. In addition, both the frequency and the AC voltage can be changed to deliver a certain torque to the compressor element according to the pressure required to compress the gas.

[0026] Alternatively, the electric motor may be of the DC motor type. The DC motor may then be connected directly to the power distribution device, but generally a DC / DC converter will be present between the power distribution device and the DC motor so as to be able to apply a terminal voltage suitable for it.

[0027] In addition, there may also be several electric motors, each driving a compressor element independently. A frequency controller may then be provided for each electric motor. Another possible configuration is that a single electric motor drives two or more compressor elements. When the current of an electric motor is mentioned, this also refers to the total current required to drive the one or more electric motors.

[0028] The current flowing between the switchgear and the electric motor is then also referred to as the electrical consumer current, or simply the consumer current. Furthermore, it is noted that this consumer current is also the current required to drive the compressor elements when the compressor is in operation.

[0029] The distribution unit is the voltage rail, also known as a bus bar, that is used to distribute power between the various connected devices. The first device is the motor just discussed. The consumer current then flows from the distribution unit to the motor.

[0030] The second device connected to the power distribution system is the onboard charger. The onboard charger is configured to convert the electrical power from the grid into a suitable value and make it available to the power distribution device. Typically, the alternating current from the grid will be converted into direct current. In this case, the current will flow from the grid through the onboard charger to the power distribution device to make the electrical power available to the various electrical devices connected to it.

[0031] Another device connected to the power distribution system is a battery management system. The battery management system is configured to support power exchange between the power distribution device and the component by monitoring the charge state of the component of one or more rechargeable batteries. To support this, the current, voltage and temperature of one or more batteries are measured, and based on this, data is exchanged with the on-board charger, which may be after one or more calculations. This enables the power exchange to occur in an optimal manner. The battery management system will also include safety functions to protect the battery by not discharging the battery too deeply. For example, discharge occurs when another electrical device connected to the power distribution device (such as an electric motor for driving a compressor element) consumes electrical power when no power grid is available.

[0032] In other words, the battery management system is a system known in the prior art. Therefore, it will ensure that the battery is maintained in a safe and reliable condition. This is achieved by monitoring the state of charge and ensuring that the battery is not discharged too deeply (among other things), as will be further explained.

[0033] The connected rechargeable battery pack is also characterized by a maximum charging current. This is the maximum current value at which the battery can be charged in a safe and efficient manner. As will be further explained, this value depends on the charge state of the battery pack. However, in principle, it will be considered a fixed value.

[0034] The controller is configured to coordinate the exchange of power between the grid, the assembly of one or more rechargeable batteries and the electric motor. The controller does this based on data exchanged with the battery management system and the onboard charger and based on the required power of the electric motor. The power may be determined based on data exchanged with the electric motor and / or via separate current measurements.

[0035] Furthermore, according to the new inventive concept, the method comprises the following steps: when the required power of the motor exceeds the available power from the grid,

[0036] - The available power is supplemented by power from components of one or more rechargeable batteries.

[0037] If the electric motor requires an electrical demand current greater than the grid can supply, this will be supplemented by current derived from an assembly of one or more rechargeable batteries.

[0038] The advantage is that the available power of the grid is not limiting. As long as there is sufficient power in the battery pack, the compressor can be used at a higher power than is available via the grid.

[0039] For example, the first situation is one in which the nominal power of the motor is greater than the available nominal power of the grid. When the battery is fully charged, the compressor can be used at its nominal power for a considerable period of time. This can happen as long as the components of the battery can make up the difference between the nominal power of the motor and the grid.

[0040] The second situation is one in which the available nominal power from the grid is sufficient compared to the nominal power of the motor, but the motor is temporarily overloaded. In other words, the power of the motor is matched to the power of the grid, but according to the specified specifications of the motor, it is desired to temporarily overload the motor to an allowable value for a certain period of time. The additional power can then be supplied by the battery. This prevents the overcurrent protection of the connection to the grid from being triggered and thereby prevents the current from the grid from being interrupted.

[0041] According to a preferred embodiment, the method further comprises the step of determining, using the battery management system, a state of charge of the assembly of one or more rechargeable batteries indicating remaining power, and wherein the completing step occurs as long as the state of charge is above a first predefined value.

[0042] In other words, the controller is also configured to supplement the required power with the current from the components of the rechargeable battery based on the state of charge of the components of the rechargeable battery, as long as the state of charge (and therefore its power) exceeds a first predefined value. This will protect the components of the battery so that they are not discharged too deeply. In addition, according to subsequent embodiments, the required power of the motor can also be limited when the state of charge of the components of the rechargeable battery is lower than a second predefined value. The limitation then includes imposing an upper limit on the power consumption of the motor, which also limits and therefore reduces the current consumed. Preferably, the second predefined value is higher than the first predefined value, or in other words, the first predefined value is lower than the second predefined value. This means that the state of charge corresponding to the second predefined value is higher than the state of charge corresponding to the first predefined value.

[0043] When the second value is reached, by limiting the power required by the electric motor, the components of the battery will discharge more slowly, thereby extending the period of time during which the compressor can be used at a higher power than that provided by the power grid. After reaching the first value, the replenishment can be completely switched off, thereby limiting the power of the electric motor to the power available from the power grid. Then, a situation may arise in which the first predefined and the second predefined value are equal to each other, wherein when the second predefined value is reached, the replenishment step is immediately stopped because the first predefined value is reached at the same time, since in this case they are identical.

[0044] For example, the limitation of the required power of the electric motor can be performed by limiting a predefined pressure and / or flow rate.

[0045] In addition, according to one embodiment, the power distribution device may also include a connector for an electrical device, wherein the method then further includes a step of limiting the electrical demand current from the electrical device when the required power of the motor exceeds the available power from the power grid. For example, the connector is a socket to which an electrical appliance can be connected. The current consumed by the device is called the electrical demand current, or simply the demand current. When the available power is not sufficient to supply both the power of the motor and the required power, it will be supplemented by power from the battery, just as when there is no additional connector. Again, this is done based on the state of charge of the components of the rechargeable battery. When the state of charge is below a second predefined value, the required power of the motor will be limited. In other words, when there is not enough available power available, the power of the compressor is limited, while the required power is continuously provided.

[0046] According to a second aspect of the utility model, an electric mobile compressor for driving a compressor element for supplying compressed gas at a predefined pressure and / or flow rate is disclosed, the compressor also comprising an electrical connection for a power grid, the electric motor being connected to a power distribution device, the power distribution device further comprising:

[0047] - an onboard charger configured to provide electrical power from the electrical grid to the power distribution device; and

[0048] - a battery management system configured to support power exchange between the power distribution device and an assembly of one or more rechargeable batteries;

[0049] - a controller configured to coordinate power exchange between the electrical grid, the assembly of one or more rechargeable batteries and the electric motor;

[0050] Wherein, the controller is further configured to control the battery management system so that when the required power of the electric motor exceeds the available power from the power grid, the available power is supplemented by power from a component of one or more rechargeable batteries.

[0051] In other words, the controller is configured to perform the computer-implemented method and associated steps according to the first aspect of the present invention. This also means that, according to one embodiment, the controller is configured to determine the charge state of the component of one or more rechargeable batteries indicating the remaining power using the battery management system, and wherein the available power is replenished as long as the charge state is above a first predefined value.

[0052] Furthermore, the controller may be configured to limit the required power of the electric motor when the state of charge is below a second predefined value. The first predefined value may be less than or equal to the second predefined value.

[0053] According to one embodiment, the controller is further configured to limit the required power of the electric motor by limiting a predefined pressure and / or flow rate.

[0054] Furthermore, the power distribution device of the electric mobile compressor may comprise a connection for an electrical consumer, and the controller is further configured to limit the required power of the motor when the state of charge is below a second predefined value when the required power of the motor and the electrical consumer exceeds the available power from the grid.

[0055] According to a third aspect of the present invention, a controller is disclosed, wherein the controller is configured to execute the computer-implemented method according to the first aspect of the present invention.

[0056] According to a fourth aspect of the present invention, a data processing system is disclosed, the data processing system comprising a processing unit configured to execute the method according to the first aspect of the present invention.

[0057] According to a fifth aspect of the present invention, a computer program product is disclosed. The computer program product comprises computer executable instructions for executing the method of the first aspect when the computer program product is executed on a computer.

[0058] According to a sixth aspect, a computer readable storage medium comprising the computer program product according to the fifth aspect is disclosed. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The present invention will be further illustrated with reference to the accompanying drawings, in which:

[0060] Figure 1 schematically illustrates a power distribution device having an electric motor, an onboard charger and a battery connected to a battery management system; and

[0061] Figure 2 Schematic diagram of the connection of the electrical device Figure 1 The power distribution equipment in

[0062] Figure 3 The diagram includes Figure 1 or Figure 2 An electric mobile compressor of the power distribution device shown in ; and

[0063] Figure 4 illustrates the course of the consumer current, maximum charge current, and discharge current under different operation modes; and

[0064] Figure 5 Different operating modes are illustrated schematically. DETAILED DESCRIPTION

[0065] The present invention will be described with respect to certain embodiments and with reference to certain drawings, but the present invention is not limited thereto and is determined solely by the claims. The drawings described are only schematic and not restrictive. In the drawings, for the purpose of illustration, the dimensions of certain elements may be exaggerated and not drawn to scale. Dimensions and relative dimensions do not necessarily correspond to actual practical embodiments of the present invention.

[0066] In addition, the terms "first", "second", "third", etc. are used in the specification and claims to distinguish similar elements, and are not necessarily used to describe a sequential or temporal order. These terms are interchangeable under appropriate circumstances, and the embodiments of the present invention can be practiced in an order other than that described or illustrated herein.

[0067] In addition, for illustrative purposes, the terms "above", "below", "over", "below", etc. are used in the specification and claims, and these terms are not necessarily used to describe relative positions. The terms used in this way are interchangeable under appropriate circumstances, and the embodiments of the utility model described herein can be implemented in orientations other than those described or illustrated herein.

[0068] Furthermore, although the various embodiments are referred to as "preferred embodiments," these are to be interpreted as exemplary means of practicing the invention rather than limitations on the scope of the invention.

[0069] The term "comprising" used in the claims should not be interpreted as being limited to the devices or steps set forth below; the term does not exclude other elements or steps. The term should be interpreted as indicating the presence of the features, elements, steps or components referred to, but does not exclude the presence or addition of one or more other features, elements, steps or components or groups thereof. Therefore, the scope of the expression "a device comprising components A and B" should not be limited to devices consisting only of components A and B. Meaning that, for the present utility model, only components A and B of the device are listed, and the claims are further interpreted to also include equivalents of these components.

[0070] When referring to currents, and more specifically to the values ​​of currents, it should be understood that these currents can refer to both alternating and direct currents, and that it can be inferred from the context which type of current is being referred to. Typically, alternating current is drawn from the grid, while charging and / or discharging currents from components of rechargeable batteries are of the direct current type. Electric motors can have both direct and alternating currents, depending on the type of motor. If there is an electrical consumer, there can also be both direct and alternating currents, but, typically, it will be alternating current.

[0071] Figure 1 Schematically illustrated is a power distribution device 101 with an electric motor 106, an onboard charger 103 and a battery management system 104 connected to a set of batteries 109. Furthermore, an electrical connection 108 for an external grid, a controller 100, an inverter 102, a compressor element 107 and a fan 105 are illustrated.

[0072] exist Figure 2 In the figure, the Figure 1 The same power distribution device 101 as in the embodiment of the present invention has an additional power converter 200 and an electrical connection 201, such as a socket, to which the electrical device can be connected.

[0073] The distribution device 101, also called a busbar, serves as a distribution board for distributing electrical power between consumers, such as the motor 106, the battery 109 and consumers connected to the electrical connections 201 (when present). The electrical power present on the distribution device 101 is of direct voltage type.

[0074] Reference again Figure 1 The inverter 102 is used to convert the DC voltage from the power distribution device 101 into a voltage suitable for the motor 106. When the motor 106 is a three-phase motor, the inverter 102 is, for example, a frequency converter, also known as a frequency controller, an inverter or a variable speed drive VSD, and the inverter is suitable for connecting to a DC voltage source having, for example, a voltage between 441 and 715V. DC When the motor 106 is a DC motor, the inverter may also be a DC / DC converter.

[0075] The electric motor 106 then drives the compressor element 107 to provide compressed gas (usually ambient air for moving the compressor) at a predefined pressure or flow rate. The electric motor is, for example, a three-phase asynchronous motor with a power of 33 kW.

[0076] Although not shown, there may also be a mechanical coupling between the electric motor 106 and the compressor element 107. This coupling, for example a gearbox, then ensures that the speed of the electric motor 106 is converted into a speed suitable for driving the compressor element 107.

[0077] Furthermore, the compressor can be provided with a fan 105, which is also connected to the inverter, as a cooling system for the motor 106 and / or the compressor element 107. The fan 105 is powered, for example, by a voltage of 28 V. Note that other cooling systems can also be provided. It is also understood that, as further discussed, the current used to power the motor also includes the current to power the fan 105 or an alternative cooling system.

[0078] Alternatively, the cooling system may comprise a fan connected to the power distribution device 101 via its own inverter. In this case, an additional demand current will have to be taken into account. The own inverter may be the inverter 200, wherein the fan is connected to an available socket 201 and the fan determines the demand current.

[0079] The on-board charger 103 is a device that converts power originating from the external grid via the electrical connection 108 into a DC voltage suitable for the power distribution device 101. The controller 100 will determine the power that must be drawn from the grid and therefore the current that will flow to the power distribution device 101, and it will control the on-board charger 103 for this purpose. This power will be determined by the state of charge of the rechargeable battery 109, the required power of the electric motor 106 and the current of the electrical device when connected to the additional inverter 200 and the connection 201.

[0080] In addition, the on-board charger 103 itself is also characterized in that it can maximize the power drawn from the power grid. For example, the on-board charger 103 has a power of 22kW, wherein the connector 108 for the power grid is a socket with a nominal current of 32A. Therefore, a maximum electrical power of 22kW can be provided to the power distribution device 101. In order to expand the capacity, more than one on-board charger can be provided, each with its own connector. The controller 100 will then be configured to control multiple on-board chargers.

[0081] Reference again Figure 1 , the current drawn from the grid is illustrated by reference numeral 111. The current flowing to the motor is illustrated by reference numeral 110, and the discharge current drawing power from the battery is illustrated by reference numeral 112. Then, when the motor 102 is running, these currents 110-112 will be in balance, and the current 110 for the motor will be composed of the sum of the current 111 from the grid 108 and the current 112 from the set of batteries 109. Figure 2 There may be an additional current for the electrical device, which is illustrated by reference numeral 203. The additional connection 201 is, for example, a socket with a nominal current of 32A.

[0082] In addition, there may be several battery packs, such as, in this example, a battery pack 202 in addition to the battery pack 109. The battery packs may then have a voltage range that complies with the inverter 102, for example between 440V and 715V, so that both devices can be connected to the power distribution device 101 at the same time under safe conditions.

[0083] The controller 100 is configured to communicate with an on-board charger 103. Furthermore, the controller 100 communicates with an inverter 102 and a battery management system 104. If there is no inverter 102, i.e. in case the motor 106 is directly connected to the power distribution device 101, reference numeral 102 illustrates a measuring unit for determining what current 110 the motor 106 needs to drive the compressor element 107. It is therefore important that the controller 100 can determine the consumer current 110 for the motor 106 (at start-up).

[0084] With the help of the battery management system 104, the controller will also determine the maximum discharge current 112 so that the motor 102 can be controlled and powered using the components of the battery 109. For example, the maximum discharge current may be 132 A. The battery management system 104 monitors the state of charge of the battery 109 and communicates to the controller 100 what the maximum discharge current 112 is.

[0085] The controller 100 will then control the onboard charger 103 and the battery management system 104 based on the consumer required current 110 for the motor 102 so that the current 110 can be supplied by the current 111 from the grid 108 , supplemented by the current 112 from the battery 109 , 202 .

[0086] Using the example mentioned above, the maximum current that can be drawn from the grid is 128 A. However, note that since the on-board charger is limited to 22 kW, the current from the grid will be limited to 32 A. Then, one can choose to connect several on-board chargers in parallel to provide higher currents.

[0087] Then, if Figure 1 and Figure 2 The arrangement shown in the figure is integrated into Figure 3 In the mobile compressor 300 illustrated in FIG. 1 , a connection 108 (e.g. a socket with a nominal current of 63 A) is provided to connect the compressor 300 to an external power grid. In addition, there may be a user interface for operating the controller 100 and / or reading the status of various components. A first example is the charge status of the group of batteries 109, 202 and the charge status of the batteries 109, 202. Other information that can be read is the pressure of the compressed gas, the rotation speed of the compressor element 107 and the total time the compressor 300 has been started.

[0088] refer to Figure 5, the compressor 300 can also be operated in different operating modes 501-503. The first operating mode 501 is a mode in which the compressor operates completely autonomously, in other words, a mode in which the electric motor fully draws electrical power (33 kW in this example) from the battery pack 109, 202. This situation may occur when no power grid is available. Then, 33 kW of electrical power corresponds to a maximum current of 73.9 A drawn from the battery pack.

[0089] The second operation mode 502 is a mode in which the compressor 300 is not started but the grid is available. In this case, the rechargeable battery 109, 202 will be charged, and in this example, the charging current 112 corresponds to a power of 22kW. Then, a maximum charging current of 49.3A will flow to the battery management system to charge the battery 109, 202.

[0090] The illustrated third operating mode 503 is a mode in which the grid is present and the compressor 300 is also started. As already explained, based on the power of the on-board charger 103, 22 kW of power may be made available from the grid.

[0091] In this example, as already mentioned, the electric power of the electric motor 106 is 33 kW, and the limited available power of 22 kW from the grid 108 can be supplemented with 11 kW of power from the battery 109, 202. This enables the electric machine to run continuously at a maximum power of 33 kW.

[0092] Finally, reference Figure 4 , provides a graphical representation of a set of graphs based on a process of power flow (graphed on the y-axis 410 in kW) over time (time on the x-axis in seconds). Graph 400 represents power flow into and out of the battery 109, 202, graph 401 represents electrical power drawn from the grid via the connection 108, and graph 402 represents power flowing to the electric motor 106 for driving the compressor element 107.

[0093] On the left side of the diagram, an operating mode is shown in which the electric motor 106 is driven entirely by power from the battery 109, 202. This therefore corresponds to Figure 5 5. On the right, a diagram of an operating mode is shown in which the electric motor 106 is driven and the batteries 109, 202 are charged. Finally, between the left and right sides of the diagram is shown an operating mode in which the electric motor 106 is driven both by electric power from the grid via the connection 108 and by electric power from the group of batteries 109, 202. This corresponds to Figure 5 An operating mode (such as operating mode 503) illustrated in FIG.

Claims

1. An electric mobile compressor (300), characterized in that: The mobile compressor comprises an electric motor (106) for driving a compressor element (107) for supplying compressed gas at a predefined pressure and / or flow rate, the compressor (300) further comprising an electrical connection (108) for an electrical grid, the electric motor (106) being connected to an electrical distribution device (101), the electrical distribution device (101) further comprising: - an on-board charger (103) configured to provide electrical power from the power grid to the power distribution device (101); and - a battery management system (104) configured to support power exchange between the power distribution device (101) and components of one or more rechargeable batteries (109, 202); - a controller (100) configured to coordinate power exchange between the grid, the components of the one or more rechargeable batteries (109, 202) and the electric motor (106); The controller (100) is further configured to control the battery management system (104) so ​​that when the required power of the electric motor (106) exceeds the available power from the power grid, the available power is supplemented by power from components of one or more rechargeable batteries (109, 202).

2. The electric mobile compressor (300) according to claim 1, characterized in that: The controller (100) is further configured to determine, using the battery management system (104), a state of charge of a component of the one or more rechargeable batteries (109, 202) indicating remaining power, and wherein the available power is replenished as long as the state of charge is above a first predefined value.

3. The electric mobile compressor (300) according to claim 2, characterized in that: The controller is further configured to limit the power required by the electric motor (106) when the state of charge is below a second predefined value.

4. The electric mobile compressor (300) according to claim 3, characterized in that: The first predefined value is less than or equal to the second predefined value.

5. The electric mobile compressor (300) according to any one of claims 2 to 3, characterized in that: The controller is also configured to limit the power required by the motor (106) by limiting a predefined pressure and / or flow rate.

6. The electric mobile compressor (300) according to any one of claims 1 to 4, characterized in that: The power distribution device (101) further comprises a connection member (201) for an electrical device, and wherein the controller is further configured to limit an electrical demand current (203) of the electrical device when the required power of the motor (106) exceeds the available power from the power grid.

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