Power management for mining or construction machines

Abstract

A method of controlling power consumption of an electrical mining and / or construction machine (2) connected to an electrical network (10) is provided, wherein the machine (2) comprises one or more electrical power consuming devices (110, 120). The method comprises the following steps: detecting an event in the network (10) based on measurements, and determining a possible change in the power consumption in the machine (2) based on work cycle thereof. Subsequently, based on the detected event in the electrical network (10) and the possible change in power consumption, a required change in the power consumption in the machine (2) is determined and requested. Based on the requested change in the power consumption in the machine (2), the power consumption in the machine (2) is adjusted. An electrical mining and / or construction machine (2) controlled according to the method is also provided.

Description

113152PC1POWER MANAGEMENT FOR MINING OR CONSTRUCTION MACHINESTechnical field

[0001] The present invention relates generally to controlling the operation of electrical mining and / or construction machines and more particularly to a method of controlling the power consumption of an electrical mining and / or construction machine as well as electrically powered mining and / or construction machine operating according to the method.Background art

[0002] Mining and / or construction machines, such as rock drilling rigs, are used for several purposes, such as exploration drilling, which aims to identify the location and quality of a mineral, and production mining and quarrying, used in the production-cycle for mining or construction. Other application areas are road construction and structural construction.

[0003] Traditionally, mining and / or construction machines have been driven by combustion engines. However, in recent years, growing environmental concerns have driven the mining industry to reducing or phasing out the traditional combustion engines to reduce and eventually stop the emission of greenhouse gases from fossil fuels.

[0004] In the mining industry the solution is focused on electrification of the machine park. Electrification has some challenges, mainly in the capacity of today’s electric batteries, especially in a rock drilling rig, where the demands for power and energy are high during rock drilling. This is solved in that the rock drilling rig can be connected to an external electrical network when performing its rock drilling work cycle.

[0005] Mining is power consuming and electricity grids in mines are often of limited capacity and varying power quality. The mining environment causes both technical and economical limitations that need to be considered when an electricity grid is constructed to a mine. Furthermore, the load in an electricity grid in a mine113152PC2 is typically variable because different tools and machines are recharged and used in irregular intervals.

[0006] A further characteristic with mines is that they may be in a remote location, causing problems with the quality of the electrical power at the mining site.

[0007] There is therefore a need for a solution mitigating or eliminating the problems of grid capacity and stability.Summary of invention

[0008] An object of the present invention is to provide a solution to the above problem of grid capacity and stability to avoid shut down of electrically operated mining machines or collapse of the grid.

[0009] According to a first aspect of the invention, a method of controlling power consumption of an electrical mining and / or construction machine connected to an electrical network is provided, the electrical mining and / or construction machine comprising at least one electrical power consuming device, the method comprising the following steps: detecting an event in the electrical network based on direct or indirect measurements in the electrical network, determining a possible change in the power consumption in the electrical mining and / or construction machine based on work cycle of said electrical mining and / or construction machine, subsequently, based on the detected event in the electrical network and the possible change in power consumption, determining and requesting a required change in the power consumption in the electrical mining and / or construction machine, and based on the requested change in the power consumption in the electrical mining and / or construction machine, adjusting the power consumption in the electrical mining and / or construction machine.

[0010] In a preferred embodiment, the event is any of the following: an operation of a circuit breaker following a fault, an alarm signal provided by an operator, an automatically trigged alarm signal, or an electrical quantity, such as voltage, current, frequency, and power, being outside a predetermined interval.113152PC3

[0011] In a preferred embodiment, the electrical mining and / or construction machine comprises a controller, wherein the controller is configured to perform all the method steps of the claimed method.

[0012] In a preferred embodiment, a controller is provided outside of the electrical mining and / or construction machine, wherein the controller is configured to perform the step of event detection and distribution of the power to said plurality of machines.

[0013] In a preferred embodiment, the change in power consumption is distributed between a plurality of electrical mining and / or construction machines.

[0014] In a preferred embodiment, the possible change of power consumption from at least two electrical mining and / or construction machines are combined and offered to the electrical network.

[0015] In a preferred embodiment, a plurality of electrical mining and / or construction machines is provided, wherein a priority of each of the plurality of electrical mining and / or construction machines is determined, preferably based on work cycle. Further, based on the determined priority, an operation of a first electrical mining and / or construction machine is paused while an operation of a second electrical mining and / or construction machines is continued or commenced.

[0016] In a preferred embodiment, a schedule planning tool for mine operation planning is used for determining the distribution of change in power consumption between the plurality of electrical mining and / or construction machines.

[0017] In a preferred embodiment, the method comprises a step of providing a local energy storage in or close to the electrical mining and / or construction machine.

[0018] In a preferred embodiment, the possible change in power consumption is distributed, preferably by means of a controller, between the at least one electrical power consuming device and the local energy storage.113152PC4

[0019] In a preferred embodiment, the possible change in power consumption is further based on available energy in the local energy storage and power capacity of the storage.

[0020] In a preferred embodiment, the local energy storage is external to the electrical mining and / or construction machine, and the method comprises the additional step of connecting the local energy storage to the electrical mining and / or construction machine, allowing it to complete a task.

[0021] In a preferred embodiment, a power capacity limit is detected during tramming and depending on the available energy in the local energy storage, the operation of the electrical mining and / or construction machine is paused or drilling of a next hole is completed.

[0022] In a preferred embodiment, the possible change in power consumption, based on said available energy in the local energy storage and / or power capacity, comprises change of control mode of the local energy source between charging and discharging modes, including charging and discharging rates.

[0023] In a preferred embodiment, the possible change in the power consumption is calculated by pausing a part of the operation by the electrical mining and / or construction machine.

[0024] In a preferred embodiment, during a power capacity limit, hole drilling is completed or paused depending on available network power and optionally power from a local energy storage.

[0025] In a preferred embodiment, the method comprises the step of providing a forecast of a power capacity of the electrical network and / or a change in power consumption, wherein the forecast preferably is used for the change in operation.

[0026] In a preferred embodiment, based on the forecast, such as for a planned shutdown, a local energy storage is charged with available headroom during operation of the electrical mining and / or construction machine.113152PC5

[0027] In a preferred embodiment, the method comprises the additional step of calculating in advance possible change in power consumption, whereby reactive power and voltage requirements in the electrical network are achieved.

[0028] According to a second aspect of the invention, an electrically powered mining and / or construction machine is provided, the machine comprising a power management system, an input of which is connectable to an external power source, a controller adapted to control the operation of the power management system, and at least one electrical power consuming device, wherein the controller is adapted to perform the method according to the invention.

[0029] According to a third aspect of the invention, a non-transitory computer- readable storage medium is provided that stores a program configured to execute the method according to the invention in an electrically powered mining and / or construction machine according to the invention.

[0030] According to a fourth aspect of the invention, a computer program product is provided comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method according to the invention in an electrically powered mining and / or construction machine according to according to the invention.Brief description of drawings

[0031] The invention is now described, by way of example, with reference to the accompanying drawings, in which:Fig. 1 shows a schematic view of a mining and / or construction machine in the form of a surface drilling rig that is electrified and has the possibility of connecting to an electrical network;Fig. 2 is an overall diagram showing the electric drive system of an electrical mining machine connected to an electrical network;Fig. 3 is a diagram showing the main components of an electric drive system of an electrical mining and / or construction machine;113152PC6Fig. 4 is a diagram showing the main components of an alternative embodiment of an electric drive system of an electrical mining and / or construction machine wherein an external energy storage is provided;Fig. 5 is a diagram showing the main components of an alternative embodiment of an electric drive system of an electrical mining and / or construction machine wherein an external controller is provided;Figs. 6a and 6b are diagrams illustrating the method according to the invention;Figs. 7, 7a, and 7b are combined a flow chart illustrating an implementation example of the method according to the invention;Fig. 8 is a flow chart of the main steps of the method according to the invention; andFigs. 9a illustrates how change in power is distributed between two electrical mining and / or construction machines. Figs. 9b illustrates how possible change in power is combined from two electrical mining and / or construction machines.Description of embodiments

[0032] In the following, a detailed description of a method of controlling power consumption of an electrical mining and / or construction machine as well as an electrically powered mining and / or construction machine operating according to the method.

[0033] The term “mining and / or construction machine” should in the context of this application be construed broadly and include drilling rigs, particularly rock drilling rigs, but also production, exploration, excavation, and construction mining rigs for surface and underground applications.

[0034] When reference is made to a “power source”, it should be understood that reference is made to a source of electrical power, unless explicitly stated otherwise.113152PC7

[0035] In the drawing figures, like reference numerals designate identical or corresponding elements throughout the several figures. It will be appreciated that these figures are for illustration only and do not in any way restrict the scope of the present invention.

[0036] Fig. 1 shows a schematic representation of a mining and / or construction machine represented by a mining machine in the form of a rock drilling rig, generally designated 2. The rock drilling rig 2 comprises a carriage 4 and a rock drilling machine 6 attached to the front of the carriage 4. The rock drilling machine 6 is arranged on and connected to the carriage 4 by means of a boom 8, so that the rock drilling machine 6 can be arranged in different positions in relation to the carriage 4 and to the rock to be drilled. Together, the carriage 4, the rock drilling machine 6 and the boom 8 form the main part of the rock drilling rig 2. The carriage 4 is further provided with propulsion means 9, such as wheels or continuous track and propulsion equipment.

[0037] The rock drilling rig 2 further comprises an electric drive system 100, which is connectable to an external grid via a cable interface 12. The rock drilling rig 2 is provided with operative power from an external energy source, not shown in Fig. 1 , via the cable interface 12, and / or an internal energy source comprised in the electric drive system 100, such as an electric battery, a super capacitor, or a fuel cell, or a combination thereof. Operative power is power that either powers the propulsion means 9 and / or the rock drilling machine 6. When the rock drilling rig 2 is operated, a controller of the electric drive system 100 is configured to selectively control operating power from the external energy source or the internal energy source, as will be described below. A work cycle normally comprises a plurality of work tasks. The controller is further configured to selectively charge the internal energy source with energy from the external electrical source, as will be described below.

[0038] Fig. 2 is an overall diagram showing the electric drive system 100 of the electrical mining machine 2 connected to an electrical network or grid 10 at a local access position. In this embodiment, the electrical network comprises two113152PC8 separate parts 10a, 10b. The two parts 10a, 10b can be connected and disconnected to / from the local access position by means of a respective circuit breaker 12a, 12b. The method described herein is applicable both when a single electrical mining and / or construction machine 2 is connected to the network 10 and when a plurality of electrical mining and / or construction machines 2 is connected to the network 10, as indicated in Fig. 2. A network control unit, not shown in the figure, is provided for controlling the operation of the electrical network.

[0039] An overall diagram of the electric drive system 100 of the mining machine of Fig. 1 is shown in Fig. 3. The electric drive system comprises a power converter 102, the input of which is connectable to an external power source 10, such as a main grid supply in the form of an electrical network, via the cable interface 12. The output of the power converter 102 is connected to a bus 104 adapted to provide electric power to one or more electrical power consuming devices in the form of electric motor units 110, 120 of the mining machine 2. This bus 104 can be either a DC bus or an AC bus. In the present example, a first electric drive unit 110 comprises a first electric motor 114 adapted to drive a load in the form of a compressor 116. For controlling the operation of the first electric motor 114, a first motor drive 112 is provided between the bus 104 and the first electric motor 114. Correspondingly, a second electric drive unit 120 comprises a second electric motor 124 adapted to drive a load in the form of one or more hydraulic pumps 126. For controlling the operation of the second electric motor 124, a second motor drive 122 is provided between the bus 104 and the second electric motor 124.

[0040] A local energy storage in the form of an internal power source 130 is optionally provided for powering the motor drives 112, 122. The internal power source 130 is electrically connected to the bus 104 and via this bus to the electric drive units 110, 120. The internal power source can be any kind of electric power storage, such as a battery, a capacitor, a super capacitor etc. It is preferred that a Battery Management System (BMS) 132 is provided for managing the internal power source 130.113152PC9

[0041] This general description of the electric drive system 100 is applicable both for AC application and DC application, and the different parts thereof are designed accordingly. For example, if the external power source 10 is an AC network and the bus 104 is a DC bus, the power converter 102 is designed as an AC / DC converter.

[0042] Finally, a controller 106 is connected to the power converter 102 for controlling the operation thereof and being configured to perform all the method steps as described below. The controller 106 is also connected to the electric drive units 110, 120 for controlling the operation thereof. If the BMS 132 is provided, then it is preferred that it is connected to the controller 106. The controller 106 is also in communication with the network control unit, preferably by means of a wireless communication channel.

[0043] A non-transitory computer-readable storage medium is provided that stores a program configured to execute a method of controlling power consumption of an electrical mining and / or construction machine as described below. Thus, a computer program product comprising instructions which, when the program is executed by a computer, such as the controller 106, cause the computer to carry out the above-mentioned method controlling power consumption of an electrical mining and / or construction machine.

[0044] In the alternative embodiment, see Fig. 4, the local energy storage is external to the electrical mining and / or construction machine 2. This means that the external energy storage 130’ is connected to the bus 104 via a connecting interface and possibly a power converter, not shown, in case of an AC bus 104. In all other aspects, this embodiment is similar to the one described above with reference to Fig. 3.

[0045] Alternatively or additionally, a controller 106’ may be provided outside of the electrical mining and / or construction machine, see Fig. 5. In this case, the controller 106’ is a network controller configured to perform the step of event detection and distribution of the power. A controller 106’ provided outside of the electrical mining and / or construction machine will also communicate with other113152PC10 components, such as a charger connected to the electrical network 10, an EES connected to a BMS managing an onboard battery etc.

[0046] A method of controlling power consumption of an electrical mining and / or construction machine as described above, i.e. , comprising at least one electrical power consuming device, and connected to an electrical network will now be described in detail.

[0047] In a first step 202, see Fig. 8, an event in the electrical network 10 is detected based on direct or indirect measurements in the electrical network 10.These direct or indirect measurements can be a number of measurements on electrical quantities, as voltage, current, frequency and derived quantities, for example power. The event can be a number of things, such as an operation of a circuit breaker following a fault, an alarm signal provided by an operator, an automatically trigged alarm signal, or an electrical quantity in the network 10, such as voltage, current, frequency, and power, being outside a predetermined range or above or below a predetermined threshold.

[0048] In another step 204, a possible change in the power consumption in the electrical mining and / or construction machine 2 is determined based on a work cycle of the electrical mining and / or construction machine 2. This work cycle can include the drill pattern, number of holes, change of rod in between drilling, and the next location to tram.

[0049] In a subsequent step 206, a required change in the power consumption in the electrical mining and / or construction machine 2 is determined and requested. This determination and request are based on the detected event in the electrical network 10 and the possible change in power consumption.

[0050] Finally, in a step 208, the power consumption in the electrical mining and / or construction machine 2 is adjusted based on the requested change in the power consumption in the electrical mining and / or construction machine 2.

[0051] In the case more than one electrical mining and / or construction machine2 is connected to the electrical network 10, the change in power consumption may113152PC11 be distributed between this plurality of electrical mining and / or construction machines 2. This is illustrated in Fig. 9a. The possible change of power consumption from at least two electrical mining and / or construction machines 2 may also be combined and offered to the electrical network 10. For example, two or more electrical mining and / or construction machines 2 may work in the same area of the mining site and the collective work performed by these machines may be synchronized, making it possible to provide a possible change in power consumption for all the machines involved. This is illustrated in Fig. 9b.

[0052] When a plurality of electrical mining and / or construction machines 2 is provided, these may in a preferred embodiment be assigned different priorities. For example, some electrical mining and / or construction machines 2 may be assigned to an area of the mining site where the operation is prioritized, and these electrical mining and / or construction machines 2 are therefore assigned a higher priority than machines assigned to other areas. Alternatively, some work cycles, such as drilling, have priority over other work cycles, such as tramming. According to the method, the priorities of the different electrical mining and / or construction machines 2 are determined, preferably based on work cycle, and, based on the priority, an operation of a first electrical mining and / or construction machine 2 is paused while an operation of a second electrical mining and / or construction machines 2 is continued or commenced. Also, in one example, the change in power consumption may be distributed between this plurality of electrical mining and / or construction machines 2 based on determined or assigned priorities.

[0053] In a preferred embodiment, a schedule planning tool for mine operation planning is used for determining the distribution of change in power consumption between the plurality of electrical mining and / or construction machines 2. This schedule planning tool may include the creation and execution of mine plans, taking into account variables like ore quality, safety, and efficiency. Short term planning is the detailed mine design, mine activity scheduling and mitigation of constraints through the detailed scheduling of necessary actions and the debottlenecking of activity constraints to ultimately achieve the production targets.113152PC12

[0054] The method is also applicable when a local energy storage 130 is provided in or close to the electrical mining and / or construction machine 2. In that case, in a preferred embodiment, the possible change in power consumption is distributed, preferably by means of the controller 106, between the electrical power consuming device(s), i.e., the electric motor units 110, 120, and the local energy storage 130.

[0055] When there is a local energy storage 130, it is preferred that the possible change in power consumption is further based on available energy in the local energy storage 130 and / or the power capacity of the local energy storage 130. For example, if the local energy storage 130, such as an onboard battery, is fully charged, the power consumption by the electrical power consuming devices may be satisfied by the onboard battery, at least for a limited time.

[0056] In the alternative embodiment where the local energy storage is external to the electrical mining and / or construction machine 2, see Fig. 4, the method comprises the additional step of connecting the local energy storage 130’ to the electrical mining and / or construction machine 2, allowing it to complete a task.

[0057] In a preferred embodiment with a local energy storage, a power capacity limit is detected during tramming and, depending on the available energy in the local energy storage 130, the operation of the electrical mining and / or construction machine 2 is paused or drilling of a next hole is completed.

[0058] Based on the available energy in the local energy storage 130, the possible change in power consumption may comprise change of control mode of the local energy source 130 between charging and discharging modes, including charging and discharging rates.

[0059] In a preferred embodiment of the method, the possible change in the power consumption is calculated by pausing a part of the work by the electrical mining and / or construction machine 2.113152PC13

[0060] The event often leads to a power capacity limit. During these conditions, hole drilling may be completed or paused depending on available network power and optionally power from a local energy storage 130.

[0061] In order to better predict future operation, a forecast of a power capacity of the electrical network 10 and / or a change in power consumption may be provided. This forecast is preferably used for the change in operation.

[0062] When a local energy storage 130 is provided, this local energy storage 130 is preferably charged with available headroom during operation of the electrical mining and / or construction machine 2. This is based on the forecast, such as for a planned shutdown.

[0063] It is preferred to calculate in advance possible change in power consumption, whereby reactive power and voltage requirements in the electrical network 10 are achieved.

[0064] The method according to the invention will now be illustrated with reference to Figs. 6a and 6b. In Fig. 6a, it is illustrated how an event in the electrical network 10 is communicated to the controller 106. Based on the detected event in the electrical network 10 and the possible change in power consumption, a required change in the power consumption in the electrical mining machine 2 is determined and requested. Based on the requested change in the power consumption in the electrical mining machine 2, the power consumption is adjusted by the controller 106. More specifically, the controller controls the motor drives 112, 122 to adjust the driving of the motors 114, 124.

[0065] Also, the BMS 132 is instructed to manage the local energy storage 130 to make the required adjustments of the operation. This could involve providing power to the motor drives 112, 122 or use excess power for charging.

[0066] In Fig. 6b, it is illustrated how the controller determines a possible change in the power consumption in the electrical mining machine 2 based on work cycle of the machine 2. Preferably, this also involves collecting information about the state of charge of the local energy storage 130 and operating113152PC14 parameters of the motor drives 112, 122, the motors 114, 124, and the drive loads 116, 126.

[0067] An example of the method during a power capacity drop will now be described with reference to the flowchart of Figs. 7, 7a, and 7b. In this example, the event in the electrical network 10 is a power capacity drop. If this is not forecasted, an emergency shutdown of the mining machine will be initiated, see Fig. 7a. If there is no local energy storage 130, such as an onboard battery, the mining machine 2 will be shut down and not complete the current task. This might mean that a drill remains in the hole to be drilled. This task will be recommenced when the network power has been restored, and in this case, it is important to recommence the task in a secure way so that the drill is not stuck and the hole collapses.

[0068] If the mining machine 2 has an onboard battery or other local energy storage, the current capacity thereof is determined. If the capacity, i.e. , the state of charge, of the local energy storage 130 is high enough to complete the current task, such as drilling a hole, this task will be completed, and a new task is assigned to the mining machine 2. However, if the capacity is not high enough to complete the current task, then it will be aborted. In the case of drilling a hole, this means that the drill is pulled out of the hole. Then, the mining machine is shut down.

[0069] If the event is forecasted, such as for a planned shutdown, then it is determined whether the capacity of the electrical network 10 is enough so that the current task of the mining machine 2 can be completed, see Fig. 7b. If this is case, then it is determined whether there is an local energy storage 130. If this is the case, all headroom about the power needed for performing the current task is used for charging the local energy storage 130. In any case, the current task is completed and the mining machine 2 is assigned a new task, and the flowchart returns to determining whether the capacity of the electrical network 10 is enough.

[0070] If it is determined that the capacity of the electrical network 10 is not enough so that the current task of the mining machine 2 can be completed, then it113152PC15 is determined whether there is an local energy storage 130. If this is the case, it is determined whether the combined capacity of the electrical network 10 and the local energy storage 130 is enough to finish the current task. If this is the case, the current task is completed and the mining machine 2 is assigned a new task, and the flowchart returns to determining whether the capacity of the electrical network 10 is enough. If the combined capacity of the electrical network 10 and the local energy storage 130 is not enough to finish the current task, this is aborted and the mining machine is shut down.

[0071] Preferred embodiments of a method of controlling power consumption of an electrical mining and / or construction machine as well as such a mining and / or construction machine have been described. It will be realized that these can be varied without departing form the inventive idea as defined in the appended claims. For example, the mining and / or construction machine may be autonomous, semi-autonomous or manually operated. The current invention is applicable for all these cases, even if an automated operation is the preferred. In the case of a manual operation, the controller of mining and / or construction machine according to the invention would just replace the tasks of the operator.

Claims

113152PC16CLAIMS1 . A method of controlling power consumption of an electrical mining and / or construction machine (2) connected to an electrical network (10), the electrical mining and / or construction machine (2) comprising at least one electrical power consuming device (110, 120), the method comprising the following steps:- detecting an event in the electrical network (10) based on direct or indirect measurements in the electrical network (10),- determining a possible change in the power consumption in the electrical mining and / or construction machine (2) based on a work cycle of said electrical mining and / or construction machine (2),- subsequently, based on the detected event in the electrical network (10) and the possible change in power consumption, determining and requesting a required change in the power consumption in the electrical mining and / or construction machine (2), and- based on the requested change in the power consumption in the electrical mining and / or construction machine (2), adjusting the power consumption in the electrical mining and / or construction machine (2).

2. The method according to claim 1 , wherein the event is any of the following: an operation of a circuit breaker following a fault, an alarm signal provided by an operator, an automatically trigged alarm signal, or an electrical quantity, such as voltage, current, frequency, and power, being outside a predetermined interval.

3. The method according to claim 1 or 2, wherein the electrical mining and / or construction machine (2) comprises a controller (106), wherein the controller (106) is configured to perform all the method steps of claim 1 .113152PC174. The method according to claim 1 or 2, wherein a controller (106’) is provided outside of the electrical mining and / or construction machine (2), wherein the controller (106’) is configured to perform the step of event detection and distribution of the power to a plurality of electrical mining and / or construction machines (2).

5. The method according to any one of claims 1-4, wherein the possible change in power consumption is distributed between a plurality of electrical mining and / or construction machines (2).

6. The method according to any one of claims 1-5, wherein the possible change of power consumption from at least two electrical mining and / or construction machines are combined and offered to the electrical network (10).

7. The method according to any one of claims 1-6, wherein a plurality of electrical mining and / or construction machines (2) is provided, and wherein a priority of each of the plurality of electrical mining and / or construction machines (2) is determined, preferably based on work cycle, and, based on the priority, an operation of a first electrical mining and / or construction machine (2) is paused while an operation of a second electrical mining and / or construction machines (2) is continued or commenced.

8. The method according to any one of claims 1-7, wherein a schedule planning tool for mine operation planning is used for determining the distribution of change in power consumption between a plurality of electrical mining and / or construction machines (2).

9. The method according to any one of claims 1-8, comprising the step of providing a local energy storage (130; 130’) in or close to the electrical mining and / or construction machine (2).

10. The method according to claims 9, wherein the possible change in power consumption is distributed, preferably by means of a controller (106), between the at least one electrical power consuming device (110, 120) and the local energy storage (130; 130’).113152PC1811 . The method according to claim 9 or 10, wherein the possible change in power consumption is further based on available energy in the local energy storage (130) and / or power capacity of the storage.

12. The method according to any one of claims 9-11 , wherein the local energy storage (130’) is external to the electrical mining and / or construction machine (2), and the method comprises the additional step of connecting the local energy storage (130’) to the electrical mining and / or construction machine (2), allowing it to complete a task.

13. The method according to any one of claims 9-12, wherein a power capacity limit is detected during tramming and, depending on the available energy and / or power in the local energy storage (130), the operation of the electrical mining and / or construction machine (2) is paused or drilling of a next hole is completed.

14. The method according to any one of claim 9-13, wherein the possible change in power consumption, based on said available energy and power capacity in the local energy storage (30), comprises change of control mode of the local energy source (130; 130’) between charging and discharging modes, including charging and discharging rates.

15. The method according to any one of claims 1 -14, wherein the possible change in power consumption is calculated by pausing a part of the work by the electrical mining and / or construction machine (2).

16. The method according to any one of claims 1 -15, wherein, during a power capacity limit, hole drilling is completed or paused depending on available network power and optionally power from a local energy storage (130; 130’).

17. The method according to any one of claims 1-16, comprising the step of providing a forecast of a power capacity of the electrical network (10) and / or a change in power consumption, wherein the forecast preferably is used for the change in operation.113152PC1918. The method according to claim 17, wherein, based on the forecast, such as for a planned shutdown, a local energy storage (130; 130’) is charged with available headroom during operation of the electrical mining and / or construction machine (2).

19. The method according to any one of claims 1 -18, comprising the additional step of calculating in advance possible change in power consumption, whereby reactive power and voltage requirements in the electrical network (10) are achieved.

20. An electrically powered mining and / or construction machine comprising a power management system (102), an input of which is connectable to an external power source (10), a controller (106) adapted to control the operation of the power management system (102), and at least one electrical power consuming device (110, 120), wherein the controller is adapted to perform the method according to any one of claims 1 -19.21 . A non-transitory computer-readable storage medium that stores a program configured to execute the method of any one of claims 1 to 19 in an electrically powered mining and / or construction machine according to claim 20.

22. A computer program product comprising instructions which, when the program is executed by a computer, cause the computer to carry out the method of any one of claims 1 to 19 in an electrically powered mining and / or construction machine according to claim 20.

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