A method for controlling an electrical mining or construction machine

Abstract

A method for controlling an electrical mining or construction machine. The electrical mining or construction machine is connected to a local electric power grid of a mine via a first point of connection. The local electric power grid is connected to an electric power source via a second point of connection. The method comprises: based on a determined voltage of the local electric power grid and based on a distance between the first point of connection and the second point of connection, controlling the active power consumption of the electrical mining or construction machine.

Description

[0001] A METHOD FOR CONTROLLING AN ELECTRICAL MINING OR CONSTRUCTION MACHINE

[0002] Technical Field

[0003] The disclosure relates to a method for controlling an electrical mining or construction machine connected to a local electric power grid. Further, the disclosure relates to a control arrangement and to an electrical system comprising a local electric power grid and one or more electrical mining or construction machine connectable to the local electric power grid.

[0004] Background

[0005] For construction work, breaking or fracturing rock and excavating and drilling tunnels or rooms underground in mines, various mining or construction machines requiring electric power for operation may be used, such as drilling rigs having one or more drilling machines drilling into to a rock formation, or rock. However, other mining or construction machines requiring electric power to operate may be used in mines. The electric power to the mining or construction machines used in mines may be provided from a utility grid via a mine electric power grid connected to the utility grid.

[0006] Summary

[0007] The inventor has found drawbacks in conventional solutions for providing electric power via local electric power grids in mines. For example, some conventional solutions are not efficient or robust enough and can be further improved.

[0008] An object of embodiments of the disclosure is to provide a solution which mitigates or solves drawbacks and problems of conventional solutions.

[0009] The above and further objects are solved by the subject matter of the appended independent claims. Further advantageous embodiments can be found in the dependent claims.

[0010] According to a first aspect of the disclosure, the above mentioned and other objects are achieved with a method for controlling an electrical mining or construction machine. The electrical mining or construction machine is connected to a local electric power grid of a mine via a first point of connection. The local electric power grid is connected to an electric power source via a second point of connection. The method comprises: based on a determined voltage of the local electric power grid and based on a distance between the first point of connection and the second point of connection, controlling the active power consumption of the electrical mining or construction machine.

[0011] An advantage of the method according to the first aspect is an improved support, such as an improved voltage support, to the local electric power grid. An advantage of the method according to the first aspect is an improved stabilization of the voltage of the local electric power grid. An advantage of the method according to the first aspect is an improved local electric power grid of a mine. An advantage of the method according to the first aspect is a more robust local electric power grid of a mine in relation to conventional solutions.

[0012] The inventor of the present invention has found that by the control of the active power consumption of the electrical mining or construction machine, which is connected to the local electric power grid, an improved support, such as an improved voltage support, to the local electric power grid is attained, together with the further advantages mentioned above.

[0013] According to an advantageous embodiment of the method according to the first aspect, the method further comprises: determining that the determined voltage of the local electric power grid and the distance between the first point of connection and the second point of connection meet voltage and distance thresholds, respectively; and in response to the determination whether the determined voltage of the local electric power grid and the distance between the first point of connection and the second point of connection meet the voltage and distance thresholds, controlling the active power consumption of the electrical mining or construction machine.

[0014] An advantage of this embodiment is a further improved local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions. An advantage of this embodiment is a further improved support, such as further improved voltage support, to the local electric power grid. According to a further advantageous embodiment of the method according to the first aspect, the method further comprises: based on the determined voltage of the local electric power grid and based on the distance between the first point of connection and the second point of connection, controlling the active power consumption of the electrical mining or construction machine so as to increase reactive power injection or absorption by the electrical mining or construction machine to / from the local electric power grid in order to provide voltage support to the local electric power grid.

[0015] An advantage of this embodiment is a further improved local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions. An advantage of this embodiment is a further improved reactive power support to the local electric power grid.

[0016] According to another advantageous embodiment of the method according to the first aspect, the method further comprises: based on the determined voltage of the local electric power grid , determining an amount of reactive power to be injected or absorbed by the electrical mining or construction machine to / from the local electric power grid; and controlling the injection or absorption of reactive power of the electrical mining or construction machine so as to inject or absorb the determined amount of reactive power to / from the local electric power grid.

[0017] An advantage of this embodiment is a further improved local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions. An advantage of this embodiment is a further improved reactive power support to the local electric power grid.

[0018] According to yet another advantageous embodiment of the method according to the first aspect, the method further comprises: based on a determined available rating of the electrical mining or construction machine and / or of a determined available rating of the machine interfacing connection to the local electric power grid, after an active power supply to the electrical mining or construction machine, determining an amount of reactive power to be injected or absorbed by the electrical mining or construction machine to / from the local electric power grid; and controlling the injection or absorption of active power of the electrical mining or construction machine so as to inject or absorb the determined amount of reactive power to / from the local electric power grid.

[0019] An advantage of this embodiment is a further improved local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions. An advantage of this embodiment is a further improved reactive power support to the local electric power grid.

[0020] According to still another advantageous embodiment of the method according to the first aspect, the method further comprises: based on the determined voltage of the local electric power grid and based on the distance between the first point of connection and the second point of connection, controlling the active power consumption of the electrical mining or construction machine so as to decrease the active power consumption of the electrical mining or construction machine.

[0021] An advantage of this embodiment is a further improved local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions. An advantage of this embodiment is a further improved voltage support and power capacity to the local electric power grid.

[0022] According to an advantageous embodiment of the method according to the first aspect, the method further comprises: based on the determined voltage of the local electric power grid and based on the distance between the first point of connection and the second point of connection, limiting the active power consumption of the electrical mining or construction machine. An advantage of this embodiment is a further improved local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions. An advantage of this embodiment is a further improved support, such as further improved voltage support and power capacity, to the local electric power grid. According to a further advantageous embodiment of the method according to the first aspect, the electric power source comprises one or more of the group of:

[0023] • an electric power generation source;

[0024] • an electric power generating unit;

[0025] • a utility grid;

[0026] • an electric battery arrangement;

[0027] • a primary substation; and

[0028] • a fossil fuel generator.

[0029] According to another advantageous embodiment of the method according to the first aspect, the electrical system comprises two or more sections of the local electric power grid, wherein each section of the two or more sections is connected to one or more electrical mining or construction machines via one or more first points of connection, wherein the two or more sections are connected to one another via two or more circuit breakers switchable between an open position and a closed position, wherein two or more of the two or more sections are connected to the electric power source via the second point of connection, wherein the method further comprises: based on the location of the one or more first points of connection, controlling one or more of the two or more circuit breakers to switch to an open position and controlling one or more of the two or more circuit breakers to switch to a closed position to move a normally open point location within the local electric power grid so as to improve the capacity utilization of the local electric power grid and limit power capacity requirement in each sections of the network within rated capacity.

[0030] An advantage of this embodiment is an improved power capacity of the local electric power grid of a mine. An advantage of this embodiment is a further improved local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions by shifting the normally open point location and connected loads in the electrical circuits. For some embodiments, it may be defined that the normally open point location is the location where a circuit breaker is normally open to keep two electrical circuits, or two sections, separate. According to yet another advantageous embodiment of the method according to the first aspect, the method further comprises: based on a determined available power rating of the two or more sections and the number of electrical mining or construction machines connected to the two or more sections via the one or more first points of connection, controlling one or more of the two or more circuit breakers to switch to an open position and controlling one or more of the two or more circuit breakers to switch to a closed position to move the normally open point location within the local electric power grid so as to improve the capacity utilization of the local electric power grid.

[0031] An advantage of this embodiment is an improved capacity of the local electric power grid of a mine. An advantage of this embodiment is a further improved local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions.

[0032] According to still another advantageous embodiment of the method according to the first aspect, the method further comprises: in the event of a fault in one or more of the two or more sections, based on the location of the one or more first points of connection and based on the active power consumption of the one or more electrical mining or construction machines, controlling one or more of the two or more circuit breakers to switch to an open position and controlling one or more of the two or more circuit breakers to switch to a closed position so as to reconfiguring the local electric power grid.

[0033] An advantage of this embodiment is an improved capacity of the local electric power grid of a mine. An advantage of this embodiment is a further improved power supply reliability after fault.

[0034] According to an advantageous embodiment of the method according to the first aspect, the method further comprises: before the occurrence of the fault in one or more of the two or more sections, predetermining which one or more of the two or more circuit breakers to be switched to an open position and predetermining which one or more of the two or more circuit breakers to be switched to a closed position in the event of the fault in one or more of the two or more sections for the reconfiguration of the local electric power grid. An advantage of this embodiment is to predetermine the possible relocation of normally open point locations maintaining power balance. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions.

[0035] According to a further advantageous embodiment of the method according to the first aspect, one or more of the two or more sections is / are connected to one or more first auxiliary electric power sources.

[0036] According to another advantageous embodiment of the method according to the first aspect, the first auxiliary electric power source comprises one or more of the group of:

[0037] • an electric power generation source;

[0038] • an electric power generating unit;

[0039] • a utility grid;

[0040] • an electric battery arrangement;

[0041] • a primary substation; and

[0042] • a fossil fuel generator.

[0043] According to yet another advantageous embodiment of the method according to the first aspect, the electric power source comprises a utility grid, wherein the method (400) further comprises: identifying the one or more largest sections of the two or more sections of the local electric power grid which can operate upon a disconnection of the local electric power grid from the utility grid without a change in the operation of the one or more electrical mining or construction machine.

[0044] An advantage of this embodiment is an improved reliability of the local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions by ensuring largest network with self-sufficient power supply.

[0045] According to a further advantageous embodiment of the method according to the first aspect, the local electric power grid is connected to one or more second auxiliary electric power sources via one or more auxiliary second points of connection, wherein the second auxiliary electric power source comprises an electric battery arrangement, wherein the method further comprises: identifying the one or more largest sections of the two or more sections of the local electric power grid which can operate upon a disconnection of the local electric power grid from the utility grid without a change in the operation of the one or more electrical mining or construction machines and with a minimum change in the regular operation of electric battery arrangement.

[0046] An advantage of this embodiment is an improved reliability of the local electric power grid of a mine. An advantage of this embodiment is a further improved local electric power grid of a mine. An advantage of this embodiment is an even more robust local electric power grid of a mine in relation to conventional solutions by ensuring largest network with self-sufficient power supply.

[0047] According to a second aspect of the disclosure, the above mentioned and other objects are achieved with a computer program or a computer-readable medium comprising instructions which, when the program or the instructions is / are executed by a computer, cause the computer to carry out the method according to any one of the embodiments disclosed above or below. Advantages of the computer program or the computer-readable medium according to the second aspect correspond to advantages of the method according to the first aspect and its embodiments mentioned above or below.

[0048] According to an aspect of the present disclosure, the above-mentioned computer program or the computer-readable medium is configured to implement the method and its embodiments described herein.

[0049] According to a third aspect of the disclosure, the above mentioned and other objects are achieved with a control arrangement for controlling an electrical mining or construction machine. The electrical mining or construction machine is connected to a local electric power grid of a mine via a first point of connection. The local electric power grid is connected to an electric power source via a second point of connection. The control arrangement is configured to: based on a determined voltage of the local electric power grid and based on a distance between the first point of connection and the second point of connection, control the active power consumption of the electrical mining or construction machine. It is to be appreciated that all the embodiments described for the method aspects of the disclosure are applicable also to the control arrangement aspects of the disclosure. Thus, all embodiments described for the method aspects of the disclosure may be performed by the control arrangement, which may include one or more controllers, control units, or one or more control devices. The embodiments of the control arrangement have advantages corresponding to advantages mentioned above for the method and its embodiments.

[0050] According to a fourth aspect of the disclosure, the above mentioned and other objects are achieved with an electrical mining or construction machine connectable to a local electric power grid. The electrical mining or construction machine comprises a control arrangement according to any one of the embodiments disclosed above or below.

[0051] Advantages of the electrical mining or construction machine according to the fourth aspect and of its embodiments correspond to advantages of the method according to the first aspect and its embodiments mentioned above or below.

[0052] According to a fifth aspect of the disclosure, the above mentioned and other objects are achieved with an electrical system comprising a local electric power grid and one or more mining or construction machines connectable to the local electric power grid via one or more first points of connection. The local electric power grid is connectable to an electric power source via a second point of connection. The electrical system comprises a control arrangement according to any one of the embodiments disclosed above or below.

[0053] Advantages of the electrical system according to the fifth aspect and of its embodiments correspond to advantages of the method according to the first aspect and its embodiments mentioned above or below.

[0054] The above-mentioned features and embodiments of the method, the computer program, the computer-readable medium, the control arrangement, the electrical mining or construction machine and the electrical system, respectively, may be combined in various possible ways providing further advantageous embodiments. Further advantageous embodiments of the method, the computer program, the computer-readable medium, the control arrangement, the electrical mining or construction machine and the electrical system and further advantages of the embodiments emerge from the detailed description of embodiments.

[0055] Brief Description of the Drawings

[0056] Embodiments of the disclosure will now be illustrated, for exemplary purposes, in more detail by way of embodiments and with reference to the enclosed drawings, where similar references are used for similar parts, in which:

[0057] Figure 1 is a schematic diagram illustrating an embodiment of the electrical system according to the fifth aspect of the disclosure and an embodiment of the electrical mining or construction machine according to the fourth aspect of the disclose to which embodiments of the method according to the first aspect of the disclose are applicable;

[0058] Figure 2 is a schematic diagram illustrating another embodiment of the electrical system according to the fifth aspect of the disclosure to which embodiments of the method according to the first aspect of the disclose are applicable;

[0059] Figure 3 is a schematic diagram illustrating yet another embodiment of the electrical system according to the fifth aspect of the disclosure to which embodiments of the method according to the first aspect of the disclose are applicable;

[0060] Figure 4A is a schematic diagram illustrating still another embodiment of the electrical system according to the fifth aspect of the disclosure to which embodiments of the method according to the first aspect of the disclose are applicable;

[0061] Figure 4B is a schematic diagram illustrating aspects of the electrical system to which embodiments of the method according to the first aspect of the disclose are applicable;

[0062] Figure 4C is a schematic diagram illustrating aspects of embodiments of the present invention; Figure 4D is a schematic diagram illustrating further aspects of embodiments of the present invention;

[0063] Figure 5 is a schematic side view of an embodiment of an electrical mining or construction machine in the form of a drilling rig and / or a mining or construction vehicle;

[0064] Figure 6 is a schematic flow chart illustrating aspects of embodiments of the method according to the first aspect of the disclosure;

[0065] Figure 7 is another schematic flow chart illustrating further aspects of embodiments of the method according to the first aspect of the disclosure;

[0066] Figure 8 is yet another schematic flow chart illustrating further aspects of embodiments of the method according to the first aspect of the disclosure;

[0067] Figure 9 is still another schematic flow chart illustrating further aspects of embodiments of the method according to the first aspect of the disclosure;

[0068] Figure 10 is yet another schematic flow chart illustrating further aspects of embodiments of the method according to the first aspect of the disclosure; and

[0069] Figure 11 is a schematic diagram illustrating an embodiment of the control arrangement according to the third aspect of the disclosure, in which a method according to any one of the herein described embodiments may be implemented.

[0070] Detailed Description

[0071] With reference to figures 1 to 4D, aspects of embodiments of the electrical mining or construction machine 104a, 104b, 104c, 104d and embodiments of the electrical system 100a, 100b, 100c, 100d, to which embodiments of the method 400 are applicable, are schematically illustrated.

[0072] With reference to figure 1 , the electrical mining or construction machine 104a is connected, or connectable, to a local electric power grid 102a of a mine via a first point of connection 106a. The local electric power grid 102a is connected, or connectable, to an electric power source 108 via a second point of connection 1 10. For some embodiments, it may be defined that the electrical system 100a comprises the local electric power grid 102a and one or more mining or construction machines 104a connectable to the local electric power grid 102a via one or more first points of connection 106a. For some embodiments, the local electric power grid 102a may be referred to, or described, as a mine electric network.

[0073] With reference to figure 1 , for some embodiments, it may be defined that the electric power source 108 is configured to provide electric power to the local electric power grid 102a. For some embodiments, the electric power source 108 may comprise one or more of the group of:

[0074] • an electric power generation source;

[0075] • an electric power generating unit;

[0076] • a utility grid 1 12;

[0077] • an electric battery arrangement, for example a battery energy storage system (BESS);

[0078] • a primary substation; and

[0079] • a fossil fuel generator 1 14.

[0080] With reference to figure 1 , for some embodiments, the first point of connection 106a may comprise a secondary substation 140, or the secondary substation 140 may comprise the first point of connection 106a. The secondary substation 140 may include one or more transformers 142. One or more sensors 144 may be provided for determining and / or measuring the voltage of the local electric power grid 102a. For some embodiments, it may be defined that one or more of the secondary substations 140, electrical mining or construction machine 104a, local electric power grid 102a and electrical system 100a includes the one or more sensors 144. For some embodiments, it may be defined that one or more of the local electric power grids 102a and electrical system 100a includes the secondary substation 140. For some embodiments, the electrical mining or construction machine 104a may include a machine controller 146 for the general control of the electrical mining or construction machine 104a. For some embodiments, the electrical mining or construction machine 104a may include a machine interface 148, or a machine interfacing connection 148, for the connection to the first point of connection 106a. The machine interface 148 may be referred to as a machine drive control interface. For some embodiments, the machine interface 148 may comprise a power converter arrangement for electric power conversion. The power converter arrangement may comprise one more power converter, for example one or more inverters and / or one or more rectifiers. For some embodiments, the mining or construction machine 104a may comprise one or more electric battery units for the operation of the mining or construction machine 104a, for example when not connected to the local electric power grid 102a.

[0081] For some embodiments, the electrical mining or construction machine 104a may comprise a control arrangement 200a according to any one of the embodiments disclosed in further detail hereinbelow, i.e., a control arrangement 200a may be located in the electrical mining or construction machine 104a. For some embodiments, the electrical system 100a may comprise a control arrangement 200a; 200e according to any one of the embodiments disclosed in further detail hereinbelow. Thus, for some embodiments, the control arrangement 200e may be external to the electrical mining or construction machine 104a.

[0082] With reference to figure 2, other embodiments of the electrical mining or construction machine 104a, 104b, 104c and another embodiment of the electrical system 100b, to which embodiments of the method 400 are applicable, are schematically illustrated. Several items of the embodiments of figure 2 correspond, or may correspond, to items of the embodiments of figure 1 disclosed above in connection with figure 1 and are thus not repeated here. The electrical system 100b of figure 2 further comprises two or more sections 1 16a, 1 16b (or feeders) of the local electric power grid 102b. Each section 1 16a-b of the two or more sections 116a, 1 16b is connected, or connectable, to one or more electrical mining or construction machines 104a, 104b, 104c via one or more first points of connection 106a, 106b, 106c. The two or more sections 1 16a, 116b are connected, or connectable, to one another via two or more circuit breakers 1 18a, 1 18b, 1 18c, 1 18d, 1 18e, 1 18f (or switches) switchable between an open position and a closed position. Two or more of the two or more sections 116a, 1 16b are connected, or connectable, to the electric power source 108 via the second point of connection 1 10. For some embodiments, the electrical system 100b or the local electric power grid 102b may comprise a network controller 150 for the general control of the local electric power grid 102b. For some embodiments, the electrical mining or construction machine 104a, 104b, 104c may comprise a control arrangement 200b according to any one of the embodiments disclosed in further detail hereinbelow. For some embodiments, the electrical system 100b may comprise a control arrangement 200a; 200f according to any one of the embodiments disclosed in further detail hereinbelow. With reference to figure 3, other embodiments of the electrical mining or construction machine 104a, 104b, 104c, 104d and another embodiment of the electrical system 100c, to which embodiments of the method 400 are applicable, are schematically illustrated. Several items of the embodiments of figure 3 correspond, or may correspond, to items of the embodiments of figures 1 and 2 disclosed above in connection with figures 1 and 2 and are thus not repeated here. For some embodiments, one 120a or more of the two or more sections 120a, 120b, 120c (or feeders) may be connected, or connectable, to one or more first auxiliary electric power sources 122, for example, one first auxiliary electric power source 122, as illustrated in figure 3. For some embodiments, the first auxiliary electric power source 122 may comprise one or more of the group of:

[0083] • an electric power generation source;

[0084] • an electric power generating unit;

[0085] • a utility grid 124;

[0086] • an electric battery arrangement;

[0087] • a primary substation; and

[0088] • a fossil fuel generator 1 14.

[0089] With reference to figure 3, for some embodiments, the electrical mining or construction machine 104a, 104b, 104c, 104d may comprise a control arrangement 200c according to any one of the embodiments disclosed in further detail hereinbelow. For some embodiments, the electrical system 100c may comprise a control arrangement 200c; 200g according to any one of the embodiments disclosed in further detail hereinbelow.

[0090] With reference to figure 4A, other embodiments of the electrical mining or construction machine 104a, 104b, 104c, 104d and another embodiment of the electrical system 100d, to which embodiments of the method 400 are applicable, are schematically illustrated. Several items of the embodiments of figure 4A correspond, or may correspond, to items of the embodiments of figures 1 to 3 disclosed above in connection with figures 1 to 3 and are thus not repeated here. For the embodiments of figure 4A, the electric power source 108 comprises a utility grid 1 12. For some embodiments, the local electric power grid 102d may be connected, or connectable, to one or more second auxiliary electric power sources 128a, 128b via one or more auxiliary second points of connection 130a, 130b, wherein the second auxiliary electric power source 128a, 128b comprises an electric battery arrangement 132a, 132b, for example a battery energy storage system (BESS). In the embodiment of figure 4A, one 128a of the one or more first auxiliary electric power sources 128a, 128b is connected, or connectable, to the local electric power grid 102d by one 130a of the one or more auxiliary second points of connection 130a, 130b, while another one 128b of the one or more first auxiliary electric power sources 128a, 128b is connected, or connectable, to the local electric power grid 102d by another one 130b of the one or more auxiliary second points of connection 130a, 130b.

[0091] With reference to figure 4A, for some embodiments, the electrical mining or construction machine 104a, 104b, 104c, 104d may comprise a control arrangement 200d according to any one of the embodiments disclosed in further detail hereinbelow. For some embodiments, the electrical system 100d may comprise a control arrangement 200d; 200h according to any one of the embodiments disclosed in further detail hereinbelow.

[0092] With reference to figure 5, an embodiment of an electrical mining or construction machine 104a in the form of a drilling rig 300a, which also may be referred to as a rock drilling rig, and / or in the form of a mining or construction vehicle 300b is schematically illustrated. The mining or construction machine 104a may have equipment 306, or means, for propulsion. In the embodiment of figure 5, the equipment 306 for propulsion comprises one or more continuous tracks 308. However, instead of continuous tracks 308, the equipment 306 for propulsion may comprise wheels, or any other means for propulsion. The mining or construction machine 104a may include a feed beam 310. The mining or construction machine 104a may include a drilling machine 312 for drilling a drill hole 314 in a rock formation 304, for example an electric and / or hydraulic drilling machine 312. The mining or construction machine 104a may include a compressor 316 for controlling hydraulic drilling machine 312. The drilling machine 312 may be connected or mounted to the feed beam 310. The drilling machine 312 may hold a drill string 302, which is turn is connect to a drill bit 313. For some embodiments, the mining or construction machine 104a may comprise one or more electric battery units 318 for driving and / or operating the mining or construction machine 104a, for example for driving the electric and / or hydraulic drilling machine 312. For some embodiments, the mining or construction machine 104a may comprise one or more combustion engines for the same purpose. For example, the mining or construction machine 104a may be utilised in surface mining, underground mining and raise boring. The mining or construction machine 104a may include a cabin 322, from where the drilling process may be controlled by an operator. Alternatively, the mining or construction machine 104a may be remotely controlled or be configured to operate autonomously. It is to be understood that the drilling rig 300a or mining or construction vehicle 300b may comprise additional tools and equipment. The electrical mining or construction machine 104a may include a control arrangement 200a according to any one of the embodiments disclosed above or below. It is to be understood that the electrical mining or construction machine 104a-d may comprise, or be in the form, of other electrical mining or construction machines, for example an electric drilling machine 312 per se, a charging station for charging one or more electric battery units, a compressor 316 per se, a pump, or any other machine or equipment used in mining or construction work.

[0093] With reference to figures 6 to 10, embodiments of the method 400 for controlling an electrical mining or construction machine 104a-d are schematically illustrated by flow charts. The electrical mining or construction machine 104a-d is connected to a local electric power grid 102a-d of a mine via a first point of connection 106a-d, wherein the local electric power grid 102a-d is connected to an electric power source 108 via a second point of connection 1 10.

[0094] With reference to figure 6, embodiments of the method 400 include the step of:

[0095] • based on a determined voltage of the local electric power grid 102a-d and based on a distance between the first point of connection 106a-d and the second point of connection 1 10, controlling 401 the active power consumption of the electrical mining or construction machine 104a-d.

[0096] For some embodiments, it may be defined that the step of controlling 401 the active power consumption of the electrical mining or construction machine 104a-d is performed so as to provide support, such as voltage support, to the local electric power grid 102a-d. For some embodiments, the power converter arrangement of the machine interface 148 may be configured to control the support to the local electric power grid 102a-d, such as control the voltage level of the local electric power grid 102a-d, by injecting (or absorbing) reactive power or current to (or from) the local electric power grid 102a-d. For some embodiments, it may be defined that the distance between the first point of connection 106a-d and the second point of connection 1 10 is predetermined, or determined beforehand. For some embodiments, the distance between the first point of connection 106a-d and the second point of connection 1 10 may be defined by an impedance or in meters.

[0097] For some embodiments, the step of controlling 401 the active power consumption of the electrical mining or construction machine 104a-d may include the step of keeping the active power consumption below an upper limit or threshold. For some embodiments, the step of controlling 401 the active power consumption of the electrical mining or construction machine 104a-d may include the step of keeping the peak / peaks of the active power consumption of the electrical mining or construction machine 104a-d below an upper limit or threshold.

[0098] With reference to figures 1 and 7, embodiments of the method 400 may include the step of: determining 400a, such as measuring, the voltage of the local electric power grid 102a-d.

[0099] With reference to figures 1 and 7, embodiments of the method 400 may include the steps of:

[0100] • determining 400b that the determined voltage of the local electric power grid 102a-d and the distance between the first point of connection 106a-d and the second point of connection 1 10 meet voltage and distance thresholds, respectively; and

[0101] • in response to the determination 400b whether the determined voltage of the local electric power grid 102a-d and the distance between the first point of connection 106a-d and the second point of connection 1 10 meet the voltage and distance thresholds, controlling 401 a the active power consumption of the electrical mining or construction machine 104a-d.

[0102] With reference to figures 1 and 7, embodiments of the method 400 may include the step of: • based on the determined voltage of the local electric power grid 102a-d and based on the distance between the first point of connection 106a-d and the second point of connection 1 10, controlling 401 the active power consumption of the electrical mining or construction machine 104a-d so as to increase reactive power injection or absorption by the electrical mining or construction machine 104a-d to / from the local electric power grid 102a-d in order to provide voltage support to the local electric power grid 102a-d.

[0103] With reference to figures 1 and 7, embodiments of the method 400 may include the steps of:

[0104] • based on the determined voltage of the local electric power grid 102a-d, determining 402 an amount of reactive power to be injected or absorbed by the electrical mining or construction machine 104a-d to / from the local electric power grid 102a-d; and

[0105] • controlling 403 the injection or absorption of reactive power of the electrical mining or construction machine 104a-d so as to inject or absorb the determined amount of reactive power to / from the local electric power grid 102a-d.

[0106] For some embodiments, the step controlling 403 the injection or absorption of reactive power of the electrical mining or construction machine 104a-d may be performed by controlling the power converter arrangement of the machine interface 148.

[0107] With reference to figures 1 and 7, embodiments of the method 400 may include the steps of:

[0108] • based on a determined available rating of the electrical mining or construction machine 104a-d and / or of a determined available rating of the machine interfacing connection 148 to the local electric power grid 102a, after an active power supply to the electrical mining or construction machine 104a-d, determining 404 an amount of reactive power to be injected or absorbed by the electrical mining or construction machine 104a-d to / from the local electric power grid 102a-d; and • controlling 405 the injection or absorption of active power of the electrical mining or construction machine 104a-d so as to inject or absorb the determined amount of reactive power to / from the local electric power grid 102a-d.

[0109] With reference to figures 1 and 7, embodiments of the method 400 may include one or more of the steps of:

[0110] • based on the determined voltage of the local electric power grid 102a-d and based on the distance between the first point of connection 106a-d and the second point of connection 1 10, controlling 406 the active power consumption of the electrical mining or construction machine 104a-d so as to decrease the active power consumption of the electrical mining or construction machine 104a-d; and

[0111] • based on the determined voltage of the local electric power grid 102a-d and based on the distance between the first point of connection 106a-d and the second point of connection 1 10, limiting 407 the active power consumption of the electrical mining or construction machine 104a-d.

[0112] With reference to figures 2 and 8, embodiments of the method 400 include one or more of the steps of:

[0113] • based on the location of the one or more first points of connection 106a-c, controlling 408 one 1 18d or more of the two or more circuit breakers 1 18a-o to switch to an open position and controlling 409 one or more 1 18b, 118c of the two or more circuit breakers 1 18a-f to switch to a closed position to move a normally open (NO) point location within the local electric power grid 102b so as to improve the capacity utilization of the local electric power grid 102b and limit power capacity requirement in each sections of the network within rated capacity; and

[0114] • based on a determined available power rating of the two or more sections 1 16a- b and the number of electrical mining or construction machines 104a-c connected to the two or more sections 1 16a-b via the one or more first points of connection 106a-c, controlling 410 one 1 18d or more of the two or more circuit breakers 1 18a-f to switch to an open position and controlling 41 1 one or more 1 18b, 1 18c of the two or more circuit breakers 1 18a-f to switch to a closed position to move the normally open point location within the local electric power grid 102b so as to improve the capacity utilization of the local electric power grid 102b.

[0115] For some embodiments, it may be defined that the normally open (NO) point location is the location where a circuit breaker is normally open (i.e., interrupting an electric current) to keep two electrical circuits, or two sections, separate.

[0116] With reference to figures 3 and 9, embodiments of the method 400 include one or more of the steps of:

[0117] • in the event of a fault 152 in one 120b or more of the two or more sections 120a, 120b, 120c, based on the location of the one or more first points of connection 106a, 106b, 106c, 106d and based on the active power consumption of the one or more electrical mining or construction machines 104a-d, controlling 412 one or more 1 18f, 1 18g of the two or more circuit breakers 1 18a-n to switch to an open position and controlling 413 one 118n or more of the two or more circuit breakers 118a-o to switch to a closed position so as to reconfiguring the local electric power grid 102c; and

[0118] • before the occurrence of the fault 152 in one 120b or more of the two or more sections 120a, 120b, 120c, predetermining 414 which one or more 1 18f, 1 18g of the two or more circuit breakers 1 18a-n to be switched to an open position and predetermining 415 which one 118n or more of the two or more circuit breakers 1 18an to be switched to a closed position in the event of the fault 152 in one 120b or more of the two or more sections 120a-c for the reconfiguration of the local electric power grid 102c.

[0119] With reference to figures 4A and 10, embodiments of the method 400 may include one or more of the steps of:

[0120] • when the electric power source 108 comprises a utility grid 1 12, identifying 416 the one or more largest sections 126a, 126b, 126c of the two or more sections 126a, 126b, 126c of the local electric power grid 102d which can operate upon a disconnection of the local electric power grid 102d from the utility grid 1 12 without a change in the operation of the one or more electrical mining or construction machine 104a-d; and • when the local electric power grid 102d is connected to one or more second auxiliary electric power sources 128a-b via one or more auxiliary second points of connection 130a-b, and when the second auxiliary electric power source 128a-b comprises an electric battery arrangement 132a, 132b, identifying 417 the one or more largest sections 126a, 126b, 126c of the two or more sections 126a, 126b, 126c of the local electric power grid 102d which can operate upon a disconnection of the local electric power grid 102d from the utility grid 1 12 without a change in the operation of the one or more electrical mining or construction machines 104a-d and with a minimum change in the regular operation of electric battery arrangement 132a-b.

[0121] Figure 4B schematically illustrates a possible segmentation of another local electric power grid 102e according to an embodiment of the method 400 of figure 10, where three sections 526a, 526b, 526c, or segments, have been identified. The middle section 526b may be identified as the largest section 526b of the three or more sections 526a, 526b, 526c, or all three sections 526a, 526b, 526c may be identified as the largest sections 526a, 526b, 526c, which can operate upon a disconnection of the local electric power grid 102e from the utility grid 1 12. N1 to N12 represent first points of connection, or nodes. M1 to M6 represent mining or construction machines connected to the local electric power grid 102e via the first points of connection N1 to N12. The filled-in squares and unfilled squares between the first points of connection N1 to N12, the electric power source 108 and the first auxiliary electric power source 122 represent circuit breakers. It is to be understood that other segmentations of the local electric power grid 102e in figure 4B, also of the local electric power grid 102d in figure 4A, into sections are possible.

[0122] Figures 4C and 4D schematically illustrate how support, such as a voltage support, may be provided to the local electric power grid 102f, or how electric power balance is updated for the local electric power grid 102f, by way of embodiments 400 of the method of figures 6 and 7, for example by changing locations of mining or construction machines, or by changing the points of connection of the mining or construction machines to the local electric power grid 102f. N1 to N4 represent first points of connection, or nodes. M1 to M3 represent mining or construction machines connected to the local electric power grid 102f via the first points of connection N1 to N4. The filled-in squares between the first points of connection N1 to N4 and the electric power source 108 represent closed circuit breakers. Pbessl and Pbess3 represent battery energy storage systems (BESS). Pgensetl represents a generator set, or a first auxiliary electric power source. Pcharger4 may represent a charging station for charging one or more electric battery units, for example carried by one or more mining or construction machines, or any other electrical load. As can be seen when comparing figures 4C and 4D: In figure 4D, a third mining or construction machine M3 has been disconnected from node N4, or from the local electric power grid 102f, or removed, in relation to figure 4C. In figure 4D, the connection of a first mining or construction machine M1 to the local electric power grid 102f has been moved from node N1 to node N2 in relation to figure 4C. In figure 4D, the connection of a second mining or construction machine M2 to the local electric power grid 102f has been moved from node N3 to node N4 in relation to figure 4C.

[0123] The above-mentioned features and embodiments of the method 400 may be combined in various possible ways.

[0124] With reference to figures 6 to 10, for some embodiments, the electric power source 108 may comprise one or more of the group of:

[0125] • an electric power generation source;

[0126] • an electric power generating unit;

[0127] • a utility grid 1 12;

[0128] • an electric battery arrangement, for example a battery energy storage system (BESS);

[0129] • a primary substation; and

[0130] • a fossil fuel generator 1 14.

[0131] Unless disclosed otherwise, it should be noted that the method steps illustrated in figures 6 to 10 and described herein do not necessarily have to be executed in the order illustrated in figures 6 to 10. The steps may essentially be executed in any suitable order. Further, one or more steps may be added without departing from the scope of the appended claims. One or more steps may be excluded without departing from the scope of the appended claims. With reference to figures 1 to 4A and 11 , aspects of embodiments of the control arrangement 200a-h for controlling an electrical mining or construction machine 104a- d are schematically illustrated, wherein the electrical mining or construction machine 104a-d is connected to a local electric power grid 102a-d of a mine via a first point of connection 106a-d, wherein the local electric power grid 102a-d is connected to an electric power source 108 via a second point of connection 1 10. Embodiments of the control arrangement 200a-h are configured to:

[0132] • based on a determined voltage of the local electric power grid 102a-d and based on a distance between the first point of connection 106a-d and the second point of connection 1 10, control 401 the active power consumption of the electrical mining or construction machine 104a-d.

[0133] For some embodiments, the control arrangement 200e-h may be stationary and external to the electrical mining or construction machine 104a-d. The control arrangement 200e-h may be located in cloud, in a control or computer system, or elsewhere. The control arrangement 200a-d may be located in the electrical mining or construction machine 104a-d. The control arrangement 200a-h may be located at two or more of said locations.

[0134] With reference to figures 1 to 4A, for some embodiments of the control arrangement 200a-h may include one or more determination units 202 for performing the steps 400b, 402, 404, 414 and 415 in figures 6 to 10. Some embodiments of the control arrangement 200a-h may include one or more controlling units 204 for performing the steps 401 , 401 a, 403, 405, 406, 408, 409, 410, 41 1 , 412 and 413 in figures 6 to 10.

[0135] With reference to figures 1 to 4A and 1 1 , for some embodiments, the control arrangement 200a-h may be configured to directly or indirectly communicate, for example wirelessly or via signal lines (or cables, or wires), with one or more of the machine controller 146, machine interface 148, network controller 150, circuit breakers 1 18a-o, electrical mining or construction machine 104a-d, local electric power grid 102a-d, electric power source 108, secondary substation 140, first auxiliary electric power sources 122, and second auxiliary electric power sources 128a-b. Thus, for some embodiments, there may be one or more signal connections between the control arrangement 200a-h and one or more of the machine controller 146, machine interface 148, network controller 150, circuit breakers 1 18a-o, electrical mining or construction machine 104a-d, local electric power grid 102a-d, electric power source 108, secondary substation 140, first auxiliary electric power sources 122, and second auxiliary electric power sources 128a-b.

[0136] Figure 1 1 shows in schematic representation an embodiment of the control arrangement 200a-h, which may include a controller 600, which may correspond to or may include one or more of the above-mentioned units 202 and 204 of the control arrangement 200a-h. The controller 600 may comprise a computing unit 601 , which can be constituted by essentially any suitable type of processor or microcomputer, for example a circuit for digital signal processing (Digital Signal Processor, DSP), or a circuit having a predetermined specific function (Application Specific Integrated Circuit, ASIC). The computing unit 601 is connected to a memory unit 602 arranged in the controller 600. The memory unit 602 provides the computing unit 601 with, for example, the stored program code and / or the stored data which the computing unit 601 requires to be able to perform computations. The computing unit 601 is also arranged to store partial or final results of computations in the memory unit 602.

[0137] With reference to figure 1 1 , in addition, the controller 600 may be provided with devices 611 , 612, 613, 614 for receiving and transmitting input and output signals. These input and output signals may contain waveforms, impulses, or other attributes which, by means of the devices 61 1 , 613 for the reception of input signals, can be detected as information and can be converted into signals which can be processed by the computing unit 601 . These signals are then made available to the computing unit 601 . The devices 612, 614 for the transmission of output signals are arranged to convert signals received from the computing unit 601 in order to create output signals by, for example, modulating the signals, which, for example, can be transmitted to parts and / or systems of, or associated with, one or more of the machine controller 146, machine interface 148, network controller 150, circuit breakers 1 18a-o, electrical mining or construction machine 104a-d, local electric power grid 102a-d, electric power source 108, secondary substation 140, first auxiliary electric power sources 122, second auxiliary electric power sources 128a-b, and a data storage device 210 (see figures 1 to 4A) for storing data. Each of the connections to the devices for receiving and transmitting input and output signals can be constituted by one or more of the group of: a cable; a data bus; and a wireless connection. With reference to figures 1 to 4A, the data stored in the data storage device 210, which may include control data, may be used for machine learning and / or Al applications.

[0138] Here and in this document, units are often described as being provided for performing steps of the method 400 according to embodiments of the disclosure. This also includes that the units are designed to and / or configured to perform these method steps.

[0139] With reference to figures 1 to 4A, the units 202 and 204 of the control arrangement 200a-h are in figures 1 to 4A illustrated as separate units. These sperate units may, however, be logically separated but physically implemented in the same unit or can be both logically and physically arranged together. The units 202 and 204 may for example correspond to groups of instructions, which can be in the form of programming code, that are input into, and are utilized by a processor / computing unit 601 (see figure 1 1 ) when the units are active and / or are utilized for performing its method step.

[0140] With reference to figure 1 1 , the control arrangement 200a-h which may include one or more controllers 600, for example one or more devices, or control devices, according to embodiments of the present disclosure may be arranged to perform all of the method steps mentioned above, in the claims, and in connection with the herein described embodiments. The control arrangement 200a-h is associated with the above-described advantages for each respective embodiment of the method 400.

[0141] With reference to figure 1 1 , a computer program 603 or a computer-readable medium is provided, comprising instructions which, when the program or the instructions is / are executed by a computer, cause the computer to carry out the method 400 according to any one of the embodiments disclosed above.

[0142] The person skilled in the art will appreciate that the herein described embodiments of the method 400 may be implemented in a computer program 603 (see figure 1 1 ), which, when it is executed in a computer, instructs the computer to execute the method 400. The computer program is usually constituted by a computer program product 603 stored on a non-transitory / non-volatile digital storage medium, in which the computer program is incorporated in the computer-readable medium of the computer program product. The computer-readable medium comprises a suitable memory, such as, for example: ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EPROM (Erasable PROM), Flash memory, EEPROM (Electrically Erasable PROM), a hard disk unit, etc.

[0143] When an item is disclosed to be connected / connectable to another item in this disclosure, it may imply that the two items are electrically connected / connectable to one another. When an item is disclosed to be connected / connectable to another item in this disclosure, it may imply that the two items are mechanically connected / connectable to one another. When an item is disclosed to be connected / connectable to another item in this disclosure, it may imply that the two items are both electrically and mechanically connected / connectable to one another.

[0144] The embodiments disclosed above may be applied to rock breakage under ground or above ground.

[0145] Finally, it should be understood that the invention is not limited to the embodiments described above, but also relates to and incorporates all embodiments within the scope of the appended independent claims.

Claims

Claims1 . A method (400) for controlling an electrical mining or construction machine (104a- d), wherein the electrical mining or construction machine (104a-d) is connected to a local electric power grid (102a-d) of a mine via a first point of connection (106a-d), wherein the local electric power grid (102a-d) is connected to an electric power source (108) via a second point of connection (110), wherein the method (400) comprises: based on a determined voltage of the local electric power grid (102a-d) and based on a distance between the first point of connection (106a-d) and the second point of connection (1 10), controlling (401 ) an active power consumption of the electrical mining or construction machine (104a-d).

2. A method (400) according to claim 1 , wherein the method (400) further comprises: determining (400b) that the determined voltage of the local electric power grid (102a-d) and the distance between the first point of connection (106a-d) and the second point of connection (1 10) meet voltage and distance thresholds, respectively; and in response to the determination (400b) whether the determined voltage of the local electric power grid (102a-d) and the distance between the first point of connection (106a-d) and the second point of connection (110) meet the voltage and distance thresholds, controlling (401 a) the active power consumption of the electrical mining or construction machine (104a-d).

3. A method (400) according to claim 1 or 2, wherein the method (400) further comprises: based on the determined voltage of the local electric power grid (102a-d) and based on the distance between the first point of connection (106a-d) and the second point of connection (1 10), controlling (401 ) the active power consumption of the electrical mining or construction machine (104a-d) so as to increase reactive power injection or absorption by the electrical mining or construction machine (104a-d)to / from the local electric power grid (102a-d) in order to provide voltage support to the local electric power grid (102a-d).

4. A method (400) according to claim 3, wherein the method (400) further comprises: based on the determined voltage of the local electric power grid (102a-d), determining (402) an amount of reactive power to be injected or absorbed by the electrical mining or construction machine (104a-d) to / from the local electric power grid (102a-d); and controlling (403) the injection or absorption of reactive power of the electrical mining or construction machine (104a-d) so as to inject or absorb the determined amount of reactive power to / from the local electric power grid (102a-d).

5. A method (400) according to claim 3 or 4, wherein the method (400) further comprises: based on a determined available rating of the electrical mining or construction machine (104a-d) and / or of a determined available rating of the machine interfacing connection (148) to the local electric power grid, after an active power supply to the electrical mining or construction machine (104a-d), determining (404) an amount of reactive power to be injected or absorbed by the electrical mining or construction machine (104a-d) to / from the local electric power grid (102a-d); and controlling (405) the injection or absorption of active power of the electrical mining or construction machine (104a-d) so as to inject or absorb the determined amount of reactive power to / from the local electric power grid (102a-d).

6. A method (400) according to any one of the claims 1 to 5, wherein the method (400) further comprises: based on the determined voltage of the local electric power grid (102a-d) and based on the distance between the first point of connection (106a-d) and the second point of connection (1 10), controlling (406) the active power consumption of the electrical mining or construction machine (104a-d) so as to decrease the active power consumption of the electrical mining or construction machine (104a-d).

7. A method (400) according to any one of the claims 1 to 6, wherein the method (400) further comprises: based on the determined voltage of the local electric power grid (102a-d) and based on the distance between the first point of connection (106a-d) and the second point of connection (1 10), limiting (407) the active power consumption of the electrical mining or construction machine (104a-d).

8. A method (400) according to any one of the claims 1 to 7, wherein the electric power source (108) comprises one or more of the group of:• an electric power generation source;• an electric power generating unit;• a utility grid (112);• an electric battery arrangement;• a primary substation; and• a fossil fuel generator (1 14).

9. A method (400) according to any one of the claims 1 to 8, wherein the electrical system (100b) comprises two or more sections (1 16a-b) of the local electric power grid (102b), wherein each section (1 16a-b) of the two or more sections (116a-b) is connected to one or more electrical mining or construction machines (104a-c) via one or more first points of connection (106a-c), wherein the two or more sections (1 16a-b) are connected to one another via two or more circuit breakers (1 18a-o) switchable between an open position and a closed position, wherein two or more of the two or more sections (1 16a-b) are connected to the electric power source (108) via the second point of connection (1 10), wherein the method (400) further comprises: based on the location of the one or more first points of connection (106a-c), controlling (408) one or more of the two or more circuit breakers (1 18a-o) to switch to an open position and controlling (409) one or more of the two or more circuit breakers (1 18a-o) to switch to a closed position to move a normally open point location within the local electric power grid (102b) so as to improve the capacity utilization of the localelectric power grid (102b) and limit power capacity requirement in each sections of the network within rated capacity.

10. A method (400) according to claim 9, wherein the method (400) further comprises: based on a determined available power rating of the two or more sections (1 16a- b) and the number of electrical mining or construction machines (104a-c) connected to the two or more sections (1 16a-b) via the one or more first points of connection (106a- c), controlling (410) one or more of the two or more circuit breakers (1 18a-o) to switch to an open position and controlling (41 1 ) one or more of the two or more circuit breakers (1 18a-o) to switch to a closed position to move the normally open point location within the local electric power grid (102b) so as to improve the capacity utilization of the local electric power grid (102b).1 1. A method (400) according to claim 9 or 10, wherein the method (400) further comprises: in the event of a fault in one or more of the two or more sections (120a-c), based on the location of the one or more first points of connection (106a-d) and based on the active power consumption of the one or more electrical mining or construction machines (104a-d), controlling (412) one or more of the two or more circuit breakers (1 18a-o) to switch to an open position and controlling (413) one or more of the two or more circuit breakers (1 18a-o) to switch to a closed position so as to reconfiguring the local electric power grid (102c).

12. A method (400) according to claim 1 1 , wherein the method (400) further comprises: before the occurrence of the fault in one or more of the two or more sections (120a-c), predetermining (414) which one or more of the two or more circuit breakers (1 18a-o) to be switched to an open position and predetermining (415) which one or more of the two or more circuit breakers (1 18a-o) to be switched to a closed position in the event of the fault in one or more of the two or more sections (120a-c) for the reconfiguration of the local electric power grid (102c).

13. A method (400) according to claim 11 or 12, wherein one or more of the two or more sections (120a-c) is / are connected to one or more first auxiliary electric power sources (122).

14. A method (400) according to claim 13, wherein the first auxiliary electric power source (122) comprises one or more of the group of:• an electric power generation source;• an electric power generating unit;• a utility grid (124);• an electric battery arrangement;• a primary substation; and• a fossil fuel generator (1 14).

15. A method (400) according to any one of the claims 9 to 14, wherein the electric power source (108) comprises a utility grid (112), and wherein the method (400) further comprises: identifying (416) the one or more largest sections (126a-c) of the two or more sections (126a-c) of the local electric power grid (102d) which can operate upon a disconnection of the local electric power grid (102d) from the utility grid (112) without a change in the operation of the one or more electrical mining or construction machine (104a-d).

16. A method (400) according to claim 15, wherein the local electric power grid (102d) is connected to one or more second auxiliary electric power sources (128a-b) via one or more auxiliary second points of connection (130a-b), wherein the second auxiliary electric power source (128a-b) comprises an electric battery arrangement (132a-b), wherein the method (400) further comprises: identifying (417) the one or more largest sections (126a-c) of the two or more sections (126a-c) of the local electric power grid (102d) which can operate upon a disconnection of the local electric power grid (102d) from the utility grid (112) without a change in the operation of the one or more electrical mining or construction machines (104a-d) and with a minimum change in the regular operation of electric battery arrangement (132a-b).

17. A computer program (603) or a computer-readable medium comprising instructions which, when the program or the instructions is / are executed by a computer, cause the computer to carry out the method (400) according to any one of the claims 1 to 16.

18. A control arrangement (200a-h) for controlling an electrical mining or construction machine (104a-d), wherein the electrical mining or construction machine (104a-d) is connected to a local electric power grid (102a-d) of a mine via a first point of connection (106a-d), wherein the local electric power grid (102a-d) is connected to an electric power source (108) via a second point of connection (1 10), wherein the control arrangement (200a-h) is configured to: based on a determined voltage of the local electric power grid (102a-d) and based on a distance between the first point of connection (106a-d) and the second point of connection (1 10), control (401 ) an active power consumption of the electrical mining or construction machine (104a-d).

19. An electrical mining or construction machine (104a-d) connectable to a local electric power grid (102a-d), wherein the electrical mining or construction machine (104a-d) comprises a control arrangement (200a-d) according to claim 18.

20. An electrical system (100a-d) comprising a local electric power grid (102a-d), and one or more mining or construction machines (104a-d) connectable to the local electric power grid (102a-d) via one or more first points of connection (106a-d), wherein the local electric power grid (102a-d) is connectable to an electric power source (108) via a second point of connection (1 10), and wherein the electrical system (100a-d) comprises a control arrangement (200a-h) according to claim 18.

Images