WO2026019348A1 - Stabilizer for an electrical charger and method thereof - Google Patents

Stabilizer for an electrical charger and method thereof

Info

Publication number
WO2026019348A1
WO2026019348A1 PCT/SE2024/050687 SE2024050687W WO2026019348A1 WO 2026019348 A1 WO2026019348 A1 WO 2026019348A1 SE 2024050687 W SE2024050687 W SE 2024050687W WO 2026019348 A1 WO2026019348 A1 WO 2026019348A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrical
stabilizer
power
input
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/SE2024/050687
Other languages
French (fr)
Inventor
Ritwik MAJUMDER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Epiroc Rock Drills AB
Original Assignee
Epiroc Rock Drills AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Epiroc Rock Drills AB filed Critical Epiroc Rock Drills AB
Priority to PCT/SE2024/050687 priority Critical patent/WO2026019348A1/en
Publication of WO2026019348A1 publication Critical patent/WO2026019348A1/en
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries for charging batteries from AC mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/12—Arrangements for adjusting voltage in AC networks by changing a characteristic of the network load
    • H02J3/14—Arrangements for adjusting voltage in AC networks by changing a characteristic of the network load by switching loads on to, or off from, the networks, e.g. progressively balanced loading
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/28—Arrangements for balancing of the load in networks by storage of energy
    • H02J3/32—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means
    • H02J3/322—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/50—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries acting upon multiple batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2105/00—Networks for supplying or distributing electric power characterised by their spatial reach or by the load
    • H02J2105/50—Networks for supplying or distributing electric power characterised by their spatial reach or by the load for selectively controlling the operation of the loads
    • H02J2105/52—Networks for supplying or distributing electric power characterised by their spatial reach or by the load for selectively controlling the operation of the loads for limitation of the power consumption in the networks or in one section of the networks, e.g. load shedding or peak shaving

Definitions

  • the disclosure relates to a stabilizer for an electrical charger for a mining/construction machine. Furthermore, the disclosure also relates to a corresponding method, an electrical charger comprising such a stabilizer, and a mining/construction machine comprising such an electrical charger.
  • Electrified mining/construction machines and vehicles provide an opportunity to reduce the environmental footprint and create a healthier work environment in mining/construction environments.
  • the electrified mining/construction machine and vehicle is driven by one or more electric motors which in turn may be powered by an electric grid system and/or an onboard electrical storage system (ESS) comprising e.g., battery packs etc.
  • ESS onboard electrical storage system
  • the electrified mining/construction machines and vehicles are emission free and can hence bring considerable savings, especially for ventilation and cooling in mining/construction environments.
  • the electrified mining/construction machines and vehicles need electrical power for their functioning and operation. That is, for powering electrical motors, batteries, etc. of the electrified mining/construction machines and vehicles.
  • the electrical storage units of the mining/construction machine and vehicle may be charged by a power grid via an electrical charger.
  • the voltage delivered by the power grid to the electrical charger may have disturbances resulting in reduced charging performance.
  • the disturbance in the input voltage from the power grid to the electrical charger creates oscillations and harmonics in the charger output voltage and current.
  • the grid voltage With high penetration of electrification, renewables and charging stations, the grid voltage will fluctuate even more with different types of disturbances.
  • a stabilizer for electrical charging can be very effective, not only for improving the charging performance of the electrical charger but also to minimize the grid voltage oscillations for overall stability of the power system.
  • An objective of embodiments of the disclosure is to provide a solution which mitigates or solves the drawbacks of conventional solutions.
  • Another objective of embodiments of the disclosure is to provide a stabilizer resulting in improved charging.
  • An advantage of the stabilizer according to the first aspect is that the charging performance of the electrical charger can be improved since the stabilizer can monitor the electrical parameters at the input of the electrical charger and thereby adapt and update the reference control value and/or the control parameter for the power conversion device of the electrical charger. Further, when steady state parameters of voltage, current, power etc. are considered, the stabilizer can help to avoid unstable charging operations for improved charging performance.
  • the electrical stabilization index comprises a voltage stability index determined based on any of: a measured reactive power flow, a voltage magnitude, a phase angle, and a charging power.
  • An advantage with this embodiment is that information related to the voltage stability is considered when determining the electrical stabilization index. Thereby, the proposed solution can improve the voltage stability during a high loading period for improved charging performance.
  • the electrical stabilization index comprises a synchronization stability index determined based on any of: a measured voltage, a power line impedance, and a phase angle of an injected reference current or a reference voltage.
  • An advantage with this embodiment is that information related to the synchronization stability is considered when determining the electrical stabilization index. Thereby, the proposed solution can improve power grid synchronization in weak power grid conditions for improved charging performance.
  • the electrical stabilization index comprises an oscillation index determined based a measured oscillation of an input current or an input voltage at the input of the electrical charger.
  • An advantage with this embodiment is that information related to the oscillation of the voltage/current is considered when determining the electrical stabilization index.
  • the oscillation index is further determined based a measured oscillation of an output current or an output voltage at an output of the electrical charger.
  • An advantage with this embodiment is that also the oscillation of the voltage/current at the output is considered when determining the electrical stabilization index. Thereby, an even more accurate indication of the oscillation can be obtained thus further improving the charging performance.
  • the reference control value is any of: a reference power, a reference current, and a reference voltage.
  • An advantage with this embodiment is that adaptation of the mentioned reference parameters ensures system stability during high load or weak power grid conditions.
  • control parameter is any of: gain of a power control loop, a current control loop, and a voltage control loop.
  • An advantage with this embodiment is that adaptation of the mentioned loops ensures system stability during high load or weak power grid conditions.
  • the stabilizer is configured to: determine the electrical stabilization index further based a measurement at an output of the electrical power grid connected to the input of the electrical charger.
  • An advantage with this embodiment is that the measurement at the output of the power grid is considered when determining the electrical stabilization index. Thereby, the determination of the electrical stabilization index can be improved which also means improved charging performance since the reference control value and/or the control parameter can be derived more accurately.
  • the stabilizer is configured to: inject a reference current or a reference voltage at the input of the electrical charger; and determine the electrical stabilization index based on a measurement at the output of the electrical charger comprising an input current, or an input voltage added with the reference current or the reference voltage.
  • An advantage with this embodiment is that the determ ination/calculation of the electrical stabilization index can be improved.
  • the stabilizer is configured to: determine the reference control value and the control parameter based on the electrical stabilization index and an associated stabilization threshold index value.
  • An advantage with this embodiment is that the stabilizer can adapt the reference control value and/or the control parameter if the electrical stabilization index passes a threshold value for improved charging performance.
  • the stabilizer is configured to: limit an output power of the power conversion device based on the electrical stabilization index.
  • An advantage with this embodiment is that by limiting the output power the voltage stabilization of the power grid is improved.
  • the stabilizer is configured to: limit the output power of the power conversion device based on the electrical stabilization index and a stabilization threshold index value.
  • the stabilizer is configured to: determine at least one energy storage reference control value and/or at least one energy storage control parameter for at least one energy storage device connected to the electrical charger and configured to provide an electrical power to the input of the electrical charger.
  • An advantage with this embodiment is that controlling of the energy storage device can be improved thereby also improving the voltage stability of the power grid.
  • the energy storage reference control value for the energy storage device is any of: a reference voltage, a reference current, a reference real power, and a reference reactive power.
  • the energy storage control parameter for the energy storage device is an interfacing converter control parameter.
  • the stabilizer is configured to: control the energy storage device based on the least one energy storage reference control value and/or at least one energy storage control parameter.
  • an electrical charger comprising: an input configured to receive an input power from an electrical power grid, an output configured to output an output power for charging a electrical mining/construction vehicle, and at least one power conversion device connected between the input and the output and configured to convert the input power to the output power; wherein the electrical charger comprises: a stabilizer according to any embodiment of the disclosure configured to control the power conversion device based on the at least one reference control value and the control parameter, or a controller configured to receive the at least one reference control value and the control parameter from the stabilizer and to control the power conversion device based on the at least one reference control value and the control parameter.
  • the electrical charger comprises multiple power conversion devices arranged between the input and the output.
  • the multiple power conversion devices are arranged as interconnected power stages between the input and the output.
  • an electrical mining/construction machine comprising an electrical charger according to any embodiments of the disclosure.
  • a method for a stabilizer comprising: determining an electrical stabilization index for an electrical power grid connected to an input of an electrical charger based on a measurement at the input of the electrical charger; determining at least one of a reference control value and a control parameter for a power conversion device of the electrical charger based on the electrical stabilization index; and controlling the power conversion device based on the at least one reference control value and the control parameter, or providing the at least one reference control value and the control parameter to a controller of the electrical charger configured to control the power conversion device.
  • the method may be adapted in accordance with the above-mentioned embodiments of the stabilizer.
  • the advantages of the method are the same as the advantages of the corresponding embodiments of the stabilizer.
  • the herein described methods may be implemented by the use of computer program products comprising instructions which, when the programs are executed by a computer, such as e.g., a control unit, cause the computer to carry out the steps of the methods according to any one of the herein described embodiments.
  • FIG. 1 and 2 show an electrical stabilizer according to embodiments of the disclosure
  • FIG. 3 shows an electrical stabilizer using measurements at the output of the electrical charger according to embodiments of the disclosure
  • FIG. 4 shows an electrical stabilizer configured to control an energy storage device
  • 5 shows a controller of an electrical charger configured to control an energy storage device according to embodiments of the disclosure
  • FIG. 6 shows an electrical charger according to embodiments of the disclosure
  • Fig. 7 shows an electrical stabilizer configured to interact with a remote electrical charger according to embodiments of the disclosure
  • Fig. 8 shows a method for a stabilizer according to embodiments of the disclosure.
  • FIG. 9 show examples of electrical mining/construction machine according to embodiments of the disclosure.
  • Fig. 1 and 2 show two aspects of an electrical stabilizer 100 for an electrical charger 300 according to embodiments of the disclosure.
  • the stabilizer 100 in Fig. 1 and 2 is configured to determine an electrical stabilization index for an electrical power grid 400, where the electrical power grid 400 is connected to an input 302 of the electrical charger 300, based on one or more first measurements MI1 , MI2, , Mln at the input 302 of the electrical charger 300.
  • the stabilizer 100 may be configured to receive such first measurements from one or more first sensors 110 configured to provide different types of measurements related to electrical parameters at the input 302 of the electrical charger 300.
  • the stabilizer 100 may obtain the first measurements MI1 , MI2, ... , Min in other ways, e.g., from another device (not shown) and sending the first measurements MI1 , MI2, ... , Min via a suitable communication interface to the stabilizer 100.
  • the stabilizer 100 is further configured to determine at least one reference control value and/or at least one control parameter for a power conversion device 320 of the electrical charger 300 based on the electrical stabilization index previously determined.
  • the electrical stabilization index may be a value such as a number.
  • the electrical stabilization index could have a value between 0 and 1 , where 0 indicates very stable and 1 indicates in verge of instability, or vice versa.
  • 0 indicates very stable and 1 indicates in verge of instability, or vice versa.
  • other values may be used for indicating the stability/instability of the system.
  • the reference control value for the power conversion device 320 may be one or more of:
  • These reference values are used for changing the operation of the power conversion device 320 by providing so-called set values. For example, reducing the power demand and thereby improving the stability of the system.
  • control parameter for the power conversion device 320 may be one or more of:
  • control loops are used for controlling the operation of the power conversion device 320 by providing control gains adapted to the electrical stabilization index. For example, changing and adapting the control speed of the power conversion device 320 and thereby improving the stability of the system.
  • the reference control value and/or the control parameter may be given as an absolute value or as a delta value depending on the application.
  • the absolute value may be applied directly in a control algorithm or method for controlling the power conversion device 320.
  • the delta value on the other hand gives a difference value from a previous reference control value or a previous control parameter used for controlling the power conversion device 320.
  • the stabilizer 100 may be configured to add or subtract a delta value to a previous existing reference control value and/or a previous control parameter for controlling the power conversion device 320.
  • the controller 310 may be configured to receive the delta values from the stabilizer 100 and add or subtract the delta value to a previous existing reference control value and/or a previous control parameter for controlling the power conversion device 320
  • one or more stabilization threshold index values may be employed by the stabilizer 100.
  • the reference control value and/or the control parameter may be determined based on the electrical stabilization index and an associated stabilization threshold index value according to embodiments of the disclosure.
  • the electrical stabilization index may be compared to the stabilization threshold index value and if the electrical stabilization index equals to or passes the stabilization threshold index value the reference control value and/or the control parameter may be adapted, i.e., changed to the new conditions of the power delivered by the power grid 400 and experienced by the electrical charger 300.
  • the stabilizer 100 is configured to directly control the power conversion device 320 based on the reference control value and/or the control parameter. This may be achieved by the stabilizer 100 controlling the power conversion device 320 via a control line/interface 120. Thus, this embodiment may imply that the stabilizer 100 is integrated with the electrical charger 300.
  • the stabilizer 100 may use a control algorithm designed for the controlling of the power conversion device 320.
  • the reference control value and/or the control parameter may be used as input values or input parameters to the control algorithm which may output control signals for controlling the power conversion device 320.
  • the control algorithm may be executed in a processor (not shown) of the stabilizer 100.
  • the stabilizer 100 can generally be considered as a control unit/device and may comprise an input for receiving measurements, a hardware and software for determining the electrical stabilization index and the reference control value and/or the control parameter derived therefrom, and an output for outputting the reference control value and/or the control parameter.
  • a controller 310 of the electrical charger 300 is instead configured to control the power conversion device 320 which means that the stabilizer 100 according to this aspect is configured to provide the reference control value and/or the control parameter to the controller 310 instead of directly controlling the power conversion device 320.
  • the stabilizer 100 may send the reference control value and/or the control parameter to the controller 310 via a communication line/interface 130.
  • the controller 310 may upon reception of the reference control value and/or the control parameter use them in a control algorithm for controlling the power conversion device 320 via a control line/interface 340.
  • the controller 310 may send control signals to the power conversion device 320 via the control line 340.
  • this embodiment may imply that the stabilizer 100 is a standalone device and not integrated with the electrical charger 300 or only partially integrated with the electrical charger 300.
  • the voltage stability index may have a value that is less than 1 which can be considered as a limit value.
  • L to the left in the formulas above are index names defining different indices. However, when values reach close to 1 this can indicate a system stability margin and the stabilizer 100 can act accordingly to limit the output power of power conversion device 320 or change the reference control value and/or change in controller parameters.
  • the electrical stabilization index comprises a synchronization stability index determined based on any of:
  • the synchronizing stability index can be calculated to fulfil the relationship given by: where I PCC is the current, V g is the voltage, Z g is the line impendence angle, and 0,, (p z are the current injection angle and the line impedance angle, respectively.
  • the stability index can be calculated for current directions to limit power or change in reference control value and/or change in controller parameters.
  • the electrical stabilization index comprises an oscillation index determined based a measured oscillation of an input current or an input voltage at the input 302 of the electrical charger 300.
  • the stabilizer 100 may inject a reference current or a reference voltage at the input 302 of the electrical charger 300.
  • the reference current or reference voltage may be in a form of a small signal injected at the input 302 of the electrical charger 300.
  • the stabilizer 100 may determine the electrical stabilization index based on a measurement at the output 304 of the electrical charger 300.
  • the measurement will in this case comprise an input current or an input voltage added with the injected reference current or the reference voltage. Thereby, improved values of the electrical stabilization index may be obtained.
  • the present stabilizer 100 may also be able to control the output power of the power conversion device 320.
  • the stabilizer 100 is configured to limit an output power Pout of the power conversion device 320 based on the electrical stabilization index. This may e.g., be achieved by the stabilizer 100 changing the reference values controlling the power conversion device 320 to limit the output power Pout. Thereby, the voltage stability may be improved in the system.
  • the stabilizer 100 may use one or more stabilization threshold index values for limiting the output power Pout of the power conversion device 320.
  • the electrical stabilization index may be compared to an associated stabilization threshold index value.
  • Fig. 3 shows a stabilizer 100 which is also configured to use one or more second measurements MO1 , MO2, ... , MOn at the output 304 of the electrical charger 300 for determining the electrical stabilization index according to embodiments of the disclosure.
  • the stabilizer 100 may receive such measurements from one or more second sensors 140 configured to provide different types of measurements related to the electrical characteristics at the output 304 of the electrical charger 300.
  • the stabilizer 100 may obtain the second measurements MO1 , MO2,... , MOn in other ways, e.g., from another device (not shown) sending the second measurements MO1 , MO2, ... , MOn via a suitable communication interface to the stabilizer 100.
  • the oscillation index as previously described may further be determined based the measured oscillation of an output current or an output voltage at an output 304 of the electrical charger 300.
  • the electrical stabilization index may be determined based on third measurements at an output 404 of the electrical power grid 400 connected to the input 302 of the electrical charger 300.
  • the third measurements may be denoted remote measurements and may be derived at a power substation of the power grid 400.
  • a communication interface 410 may be arranged from the location of the remote measurements to the stabilizer 100 so that the stabilizer 100 can receive such third measurements.
  • the third measurements may be any of:
  • one or more electrical energy storage devices 330 may be connected to the electrical charger 300.
  • the electrical energy storage device 330 is configured to provide an electrical power at the input 102 of the electrical charger 300 when needed.
  • the electrical energy storage device 330 may either be controlled by the stabilizer 100 as shown in Fig. 4 or by the controller 310 as shown in Fig. 5.
  • the stabilizer 100 may be configured to determine at least one energy storage reference control value and/or at least one energy storage control parameter for at least one energy storage device 330 connected to the electrical charger 300.
  • the energy storage device 330 is configured to provide an electrical power to the input 102 of the electrical charger 300.
  • the energy storage device 330 may be any power device able to deliver electrical power such as a battery and a capacitor.
  • the energy storage reference control value for the energy storage device 330 is any of:
  • These reference control values are used for controlling the energy storage device 330.
  • the energy storage control parameter for the energy storage device 330 may be an interfacing converter control parameter since the interfacing converter controls the power flow supplied by the energy storage device 330.
  • the feeder or feeder line is the electrical line between the power grid and the electrical charger.
  • K2cos transmission angle-phase angle (K2cos transmission angle-phase angle )) ⁇
  • KlP grid and K2 are constant values depending on the network and control parameters
  • sin and cos are the sinus and cosines functions, respectively, with input values defined as the difference between the transmission angle and the phase angle.
  • Fig. 5 shows the case when the stabilizer 100 is configured to provide the energy storage reference control value and/or the energy storage control parameter to the controller 310 via a communication interface 120.
  • the controller 310 uses the energy storage reference control value and/or the energy storage control parameter for controlling the energy storage device 330 via a control interface 340.
  • the controller 310 can send control signals to the energy storage device 330 via the control line 340 for controlling the energy storage device 330.
  • Fig. 6 shows an electrical charger 300 according to embodiments of the disclosure.
  • the electrical charger 300 may include more than one charging links as also shown in Fig. 6.
  • Each charging link may include one or more conversion devices 320 connected between an input 302 and an output 304 of the electrical charger 300.
  • the charging links may be connected to the same or different power grids at the input 302 and connected the same or different mining/construction machines at the output 304.
  • Fig. 7 shows an electrical stabilizer 100 which is configured to interact with one or more remote electrical chargers 300' according to embodiments of the disclosure.
  • the electrical stabilizer 100 may therefore in an example provide a reference control value and/or a control parameter for a remote power conversion device of a remote electrical charger 300' via a communication interface 120.
  • the reference control value and/or a control parameter may be sent to a controller of the remote electrical charger 300'.
  • the electrical stabilizer 100 may in another example directly control the remote power conversion device 320' via a control interface 130.
  • Fig. 8 shows a method 200 for a stabilizer 100 according to embodiments of the disclosure.
  • the method 200 comprises the steps of: determining 202 an electrical stabilization index for an electrical power grid 400 connected to an input 302 of an electrical charger 300 based on a measurement at the input 302 of the electrical charger 300; determining 204 at least one of a reference control value and a control parameter for a power conversion device 320 of the electrical charger 300 based on the electrical stabilization index; and controlling 206 the power conversion device 320 based on the at least one reference control value and the control parameter, or providing 208 the at least one reference control value and the control parameter to a controller 310 of the electrical charger 300 configured to control the power conversion device 320.
  • Embodiments of the method 200 may fully correspond to the embodiments of the stabilizer 100.
  • the method 200 may be executed in a processor of a computer by a computer program with a program code for performing the herein disclosed method when the computer program runs on a computer.
  • Fig. 9 show examples of electrical mining/construction machine 500 according to embodiments of the disclosure.
  • the electrical mining/construction machine 500 comprises an electrical charger 300 according to any embodiments of the disclosure.
  • the mining/construction machine 500 may be any type of electrified machine or vehicle used in a mining and/or construction environment/site such as e.g., a drill rig, a truck, a loader, a digging machine, etc.
  • the mining/construction machine/vehicle 500 may e.g., be a drill rig, a loading, hauling, and dumping (LHD) machine or a mine truck but is not limited thereto.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Embodiments of the disclosure relates to stabilizer (100) for one or more electrical chargers (300), the stabilizer (100) being configured to: determine an electrical stabilization index for an electrical power grid (400) connected to an input (302) of the electrical charger (300) based on a measurement at the input (302) of the electrical charger (300); determine at least one of a reference control value and a control parameter for a power conversion device (320) of the electrical charger (300) based on the electrical stabilization index; and control the power conversion device (320) based on the at least one reference control value and the control parameter, or provide the at least one reference control value and the control parameter to a controller (310) of the electrical charger (300) configured to control the power conversion device (320) Furthermore, the disclosure also relates to a corresponding method, an electrical charger comprising such a stabilizer, and a mining/construction machine/vehicle comprising such an electrical charger.

Description

STABILIZER FOR AN ELECTRICAL CHARGER AND METHOD THEREOF
Technical Field
The disclosure relates to a stabilizer for an electrical charger for a mining/construction machine. Furthermore, the disclosure also relates to a corresponding method, an electrical charger comprising such a stabilizer, and a mining/construction machine comprising such an electrical charger.
Background
Electrified mining/construction machines and vehicles provide an opportunity to reduce the environmental footprint and create a healthier work environment in mining/construction environments.
The electrified mining/construction machine and vehicle is driven by one or more electric motors which in turn may be powered by an electric grid system and/or an onboard electrical storage system (ESS) comprising e.g., battery packs etc. Compared to diesel machines and vehicles, the electrified mining/construction machines and vehicles are emission free and can hence bring considerable savings, especially for ventilation and cooling in mining/construction environments.
However, the electrified mining/construction machines and vehicles need electrical power for their functioning and operation. That is, for powering electrical motors, batteries, etc. of the electrified mining/construction machines and vehicles. In this respect the electrical storage units of the mining/construction machine and vehicle may be charged by a power grid via an electrical charger.
However, the voltage delivered by the power grid to the electrical charger may have disturbances resulting in reduced charging performance. Generally, the disturbance in the input voltage from the power grid to the electrical charger creates oscillations and harmonics in the charger output voltage and current. With high penetration of electrification, renewables and charging stations, the grid voltage will fluctuate even more with different types of disturbances. A stabilizer for electrical charging can be very effective, not only for improving the charging performance of the electrical charger but also to minimize the grid voltage oscillations for overall stability of the power system.
Conventional solutions for electrical chargers derates the power when a temperature increase is detected.
Summary
An objective of embodiments of the disclosure is to provide a solution which mitigates or solves the drawbacks of conventional solutions.
Another objective of embodiments of the disclosure is to provide a stabilizer resulting in improved charging.
According to a first aspect of the disclosure, the above mentioned and other objectives are achieved with a stabilizer for one or more electrical chargers, the stabilizer being configured to: determine an electrical stabilization index for an electrical power grid connected to an input of the electrical charger based on a measurement at the input of the electrical charger; determine at least one of a reference control value and a control parameter for a power conversion device of the electrical charger based on the electrical stabilization index; and control the power conversion device based on the at least one reference control value and the control parameter, or provide the at least one reference control value and the control parameter to a controller of the electrical charger configured to control the power conversion device.
An advantage of the stabilizer according to the first aspect is that the charging performance of the electrical charger can be improved since the stabilizer can monitor the electrical parameters at the input of the electrical charger and thereby adapt and update the reference control value and/or the control parameter for the power conversion device of the electrical charger. Further, when steady state parameters of voltage, current, power etc. are considered, the stabilizer can help to avoid unstable charging operations for improved charging performance.
In an embodiment of a stabilizer according to the first aspect, the electrical stabilization index comprises a voltage stability index determined based on any of: a measured reactive power flow, a voltage magnitude, a phase angle, and a charging power.
An advantage with this embodiment is that information related to the voltage stability is considered when determining the electrical stabilization index. Thereby, the proposed solution can improve the voltage stability during a high loading period for improved charging performance.
In an embodiment of a stabilizer according to the first aspect, the electrical stabilization index comprises a synchronization stability index determined based on any of: a measured voltage, a power line impedance, and a phase angle of an injected reference current or a reference voltage.
An advantage with this embodiment is that information related to the synchronization stability is considered when determining the electrical stabilization index. Thereby, the proposed solution can improve power grid synchronization in weak power grid conditions for improved charging performance.
In an embodiment of a stabilizer according to the first aspect, the electrical stabilization index comprises an oscillation index determined based a measured oscillation of an input current or an input voltage at the input of the electrical charger.
An advantage with this embodiment is that information related to the oscillation of the voltage/current is considered when determining the electrical stabilization index.
Thereby, the negative effects of oscillation of the power grid are minimized for improved charging performance. In an embodiment of a stabilizer according to the first aspect, the oscillation index is further determined based a measured oscillation of an output current or an output voltage at an output of the electrical charger.
An advantage with this embodiment is that also the oscillation of the voltage/current at the output is considered when determining the electrical stabilization index. Thereby, an even more accurate indication of the oscillation can be obtained thus further improving the charging performance.
In an embodiment of a stabilizer according to the first aspect, the reference control value is any of: a reference power, a reference current, and a reference voltage.
An advantage with this embodiment is that adaptation of the mentioned reference parameters ensures system stability during high load or weak power grid conditions.
In an embodiment of a stabilizer according to the first aspect, the control parameter is any of: gain of a power control loop, a current control loop, and a voltage control loop.
An advantage with this embodiment is that adaptation of the mentioned loops ensures system stability during high load or weak power grid conditions.
In an embodiment of a stabilizer according to the first aspect, the stabilizer is configured to: determine the electrical stabilization index further based a measurement at an output of the electrical power grid connected to the input of the electrical charger.
An advantage with this embodiment is that the measurement at the output of the power grid is considered when determining the electrical stabilization index. Thereby, the determination of the electrical stabilization index can be improved which also means improved charging performance since the reference control value and/or the control parameter can be derived more accurately.
In an embodiment of a stabilizer according to the first aspect, the stabilizer is configured to: inject a reference current or a reference voltage at the input of the electrical charger; and determine the electrical stabilization index based on a measurement at the output of the electrical charger comprising an input current, or an input voltage added with the reference current or the reference voltage.
An advantage with this embodiment is that the determ ination/calculation of the electrical stabilization index can be improved.
In an embodiment of a stabilizer according to the first aspect, the stabilizer is configured to: determine the reference control value and the control parameter based on the electrical stabilization index and an associated stabilization threshold index value.
An advantage with this embodiment is that the stabilizer can adapt the reference control value and/or the control parameter if the electrical stabilization index passes a threshold value for improved charging performance.
In an embodiment of a stabilizer according to the first aspect, the stabilizer is configured to: limit an output power of the power conversion device based on the electrical stabilization index.
An advantage with this embodiment is that by limiting the output power the voltage stabilization of the power grid is improved.
In an embodiment of a stabilizer according to the first aspect, the stabilizer is configured to: limit the output power of the power conversion device based on the electrical stabilization index and a stabilization threshold index value.
In an embodiment of a stabilizer according to the first aspect, the stabilizer is configured to: determine at least one energy storage reference control value and/or at least one energy storage control parameter for at least one energy storage device connected to the electrical charger and configured to provide an electrical power to the input of the electrical charger.
An advantage with this embodiment is that controlling of the energy storage device can be improved thereby also improving the voltage stability of the power grid.
In an embodiment of a stabilizer according to the first aspect, the energy storage reference control value for the energy storage device is any of: a reference voltage, a reference current, a reference real power, and a reference reactive power.
In an embodiment of a stabilizer according to the first aspect, the energy storage control parameter for the energy storage device is an interfacing converter control parameter.
In an embodiment of a stabilizer according to the first aspect, the stabilizer is configured to: control the energy storage device based on the least one energy storage reference control value and/or at least one energy storage control parameter.
According to a second aspect of the disclosure, the above mentioned and other objectives are achieved with an electrical charger comprising: an input configured to receive an input power from an electrical power grid, an output configured to output an output power for charging a electrical mining/construction vehicle, and at least one power conversion device connected between the input and the output and configured to convert the input power to the output power; wherein the electrical charger comprises: a stabilizer according to any embodiment of the disclosure configured to control the power conversion device based on the at least one reference control value and the control parameter, or a controller configured to receive the at least one reference control value and the control parameter from the stabilizer and to control the power conversion device based on the at least one reference control value and the control parameter. Thereby, an electrical charger with improved charging performance is provided compared to conventional solutions.
In an embodiment of an electrical charger according to the second aspect, the electrical charger comprises multiple power conversion devices arranged between the input and the output.
In an embodiment of an electrical charger according to the second aspect, the multiple power conversion devices are arranged as interconnected power stages between the input and the output.
According to a third aspect of the disclosure, the above mentioned and other objectives are achieved with an electrical mining/construction machine comprising an electrical charger according to any embodiments of the disclosure.
According to a fourth aspect of the disclosure, the above mentioned and other objectives are achieved with a method for a stabilizer, the method comprising: determining an electrical stabilization index for an electrical power grid connected to an input of an electrical charger based on a measurement at the input of the electrical charger; determining at least one of a reference control value and a control parameter for a power conversion device of the electrical charger based on the electrical stabilization index; and controlling the power conversion device based on the at least one reference control value and the control parameter, or providing the at least one reference control value and the control parameter to a controller of the electrical charger configured to control the power conversion device.
The method may be adapted in accordance with the above-mentioned embodiments of the stabilizer. The advantages of the method are the same as the advantages of the corresponding embodiments of the stabilizer. According to further aspects of the present disclosure, the herein described methods may be implemented by the use of computer program products comprising instructions which, when the programs are executed by a computer, such as e.g., a control unit, cause the computer to carry out the steps of the methods according to any one of the herein described embodiments.
Further applications and advantages of embodiments of the disclosure will be apparent from the following detailed description.
Brief Description of the Drawings
The appended drawings are intended to clarify and explain different embodiments of the disclosure in which:
- Fig. 1 and 2 show an electrical stabilizer according to embodiments of the disclosure;
- Fig. 3 shows an electrical stabilizer using measurements at the output of the electrical charger according to embodiments of the disclosure;
- Fig. 4 shows an electrical stabilizer configured to control an energy storage device, while 5 shows a controller of an electrical charger configured to control an energy storage device according to embodiments of the disclosure;
- Fig. 6 shows an electrical charger according to embodiments of the disclosure;
- Fig. 7 shows an electrical stabilizer configured to interact with a remote electrical charger according to embodiments of the disclosure;
- Fig. 8 shows a method for a stabilizer according to embodiments of the disclosure; and
- Fig. 9 show examples of electrical mining/construction machine according to embodiments of the disclosure.
Detailed Description
Fig. 1 and 2 show two aspects of an electrical stabilizer 100 for an electrical charger 300 according to embodiments of the disclosure. The stabilizer 100 in Fig. 1 and 2 is configured to determine an electrical stabilization index for an electrical power grid 400, where the electrical power grid 400 is connected to an input 302 of the electrical charger 300, based on one or more first measurements MI1 , MI2, , Mln at the input 302 of the electrical charger 300.
Thus, the stabilizer 100 may be configured to receive such first measurements from one or more first sensors 110 configured to provide different types of measurements related to electrical parameters at the input 302 of the electrical charger 300. In an alternative, the stabilizer 100 may obtain the first measurements MI1 , MI2, ... , Min in other ways, e.g., from another device (not shown) and sending the first measurements MI1 , MI2, ... , Min via a suitable communication interface to the stabilizer 100.
According to embodiments of the disclosure, the stabilizer 100 is further configured to determine at least one reference control value and/or at least one control parameter for a power conversion device 320 of the electrical charger 300 based on the electrical stabilization index previously determined.
The electrical stabilization index may be a value such as a number. For example, the electrical stabilization index could have a value between 0 and 1 , where 0 indicates very stable and 1 indicates in verge of instability, or vice versa. Naturally, other values may be used for indicating the stability/instability of the system.
In embodiments, the reference control value for the power conversion device 320 may be one or more of:
• A reference power value;
• A reference current value; and/or
• A reference voltage value.
These reference values are used for changing the operation of the power conversion device 320 by providing so-called set values. For example, reducing the power demand and thereby improving the stability of the system.
In embodiments, the control parameter for the power conversion device 320 may be one or more of:
• A gain of a power control loop;
• A current control loop; and/or • A voltage control loop.
These control loops are used for controlling the operation of the power conversion device 320 by providing control gains adapted to the electrical stabilization index. For example, changing and adapting the control speed of the power conversion device 320 and thereby improving the stability of the system.
The reference control value and/or the control parameter may be given as an absolute value or as a delta value depending on the application. The absolute value may be applied directly in a control algorithm or method for controlling the power conversion device 320. The delta value on the other hand gives a difference value from a previous reference control value or a previous control parameter used for controlling the power conversion device 320. Thus, the stabilizer 100 may be configured to add or subtract a delta value to a previous existing reference control value and/or a previous control parameter for controlling the power conversion device 320. Correspondingly, the controller 310 may be configured to receive the delta values from the stabilizer 100 and add or subtract the delta value to a previous existing reference control value and/or a previous control parameter for controlling the power conversion device 320
For determining the reference control value and/or the control parameter one or more stabilization threshold index values may be employed by the stabilizer 100. Thus, the reference control value and/or the control parameter may be determined based on the electrical stabilization index and an associated stabilization threshold index value according to embodiments of the disclosure. The electrical stabilization index may be compared to the stabilization threshold index value and if the electrical stabilization index equals to or passes the stabilization threshold index value the reference control value and/or the control parameter may be adapted, i.e., changed to the new conditions of the power delivered by the power grid 400 and experienced by the electrical charger 300.
In Fig. 1 , the stabilizer 100 is configured to directly control the power conversion device 320 based on the reference control value and/or the control parameter. This may be achieved by the stabilizer 100 controlling the power conversion device 320 via a control line/interface 120. Thus, this embodiment may imply that the stabilizer 100 is integrated with the electrical charger 300. For controlling the power conversion device 320, the stabilizer 100 may use a control algorithm designed for the controlling of the power conversion device 320. Thus, the reference control value and/or the control parameter may be used as input values or input parameters to the control algorithm which may output control signals for controlling the power conversion device 320. The control algorithm may be executed in a processor (not shown) of the stabilizer 100. The stabilizer 100 can generally be considered as a control unit/device and may comprise an input for receiving measurements, a hardware and software for determining the electrical stabilization index and the reference control value and/or the control parameter derived therefrom, and an output for outputting the reference control value and/or the control parameter.
In Fig. 2, a controller 310 of the electrical charger 300 is instead configured to control the power conversion device 320 which means that the stabilizer 100 according to this aspect is configured to provide the reference control value and/or the control parameter to the controller 310 instead of directly controlling the power conversion device 320. The stabilizer 100 may send the reference control value and/or the control parameter to the controller 310 via a communication line/interface 130. The controller 310 may upon reception of the reference control value and/or the control parameter use them in a control algorithm for controlling the power conversion device 320 via a control line/interface 340. In this regard the controller 310 may send control signals to the power conversion device 320 via the control line 340. Thus, this embodiment may imply that the stabilizer 100 is a standalone device and not integrated with the electrical charger 300 or only partially integrated with the electrical charger 300.
The power conversion device 320 herein employed may be any suitable device configured to convert an input power at the input 302 to an output power at the output 304. The input power may be an AC or a DC power and the output power may be an AC or DC power. The power conversion may relate to conversion of power level, conversion from AC to DC, conversion from DC to AC, conversion from a first AC to a second AC, conversion from a first DC to a second DC, conversion of voltage, conversion of current, conversion of frequency, and isolation transformer which is configured to provide isolation between input and output for electrical safety. Furthermore, it may be understood that different types of electrical stabilization indices may be employed in the present stabilizer solution depending on the nature of the instability. The different types of electrical stabilization indices may be used alone or in combination for improved charging performance.
In a first case, the electrical stabilization index comprises a voltage stability index determined based on any of:
• A measured reactive power flow which is the reactive power at the supply point of the power grid;
• A voltage magnitude of the input voltage at the charger 300;
• A phase angle of the input voltage at the charger 300; and/or
• A charging power which is the active power used for charging the mining/construction machine 500.
In an example, the voltage stability index can be calculated as: voltage stability index +S2 Z2 = 0 is sending end voltage, Vr is receiving end voltage, Qr is reactive power, Pr is active power, X is reactance of the power line, R is resistance of the power line, and 0 and 6 are phase angles of the voltages of the sending end and the receiving end, respectively.
For stability, the voltage stability index may have a value that is less than 1 which can be considered as a limit value. L to the left in the formulas above are index names defining different indices. However, when values reach close to 1 this can indicate a system stability margin and the stabilizer 100 can act accordingly to limit the output power of power conversion device 320 or change the reference control value and/or change in controller parameters. In a second case, the electrical stabilization index comprises a synchronization stability index determined based on any of:
• A measured voltage at the point of common coupling (PCC) where the charger 300 is connected to the power grid 400;
• A power line impedance of the power line feeding the electrical charger 300; and/or
• A phase angle of an injected reference current or a reference voltage at the PCC.
In an example, the synchronizing stability index can be calculated to fulfil the relationship given by: where IPCC is the current, Vg is the voltage, Zg is the line impendence angle, and 0,, (pz are the current injection angle and the line impedance angle, respectively.
The stability index can be calculated for current directions to limit power or change in reference control value and/or change in controller parameters.
In a third case, the electrical stabilization index comprises an oscillation index determined based a measured oscillation of an input current or an input voltage at the input 302 of the electrical charger 300.
In further embodiments of the disclosure, the stabilizer 100 may inject a reference current or a reference voltage at the input 302 of the electrical charger 300. The reference current or reference voltage may be in a form of a small signal injected at the input 302 of the electrical charger 300. Thereafter, the stabilizer 100 may determine the electrical stabilization index based on a measurement at the output 304 of the electrical charger 300. The measurement will in this case comprise an input current or an input voltage added with the injected reference current or the reference voltage. Thereby, improved values of the electrical stabilization index may be obtained.
The present stabilizer 100 may also be able to control the output power of the power conversion device 320. Hence, in embodiments of the disclosure, the stabilizer 100 is configured to limit an output power Pout of the power conversion device 320 based on the electrical stabilization index. This may e.g., be achieved by the stabilizer 100 changing the reference values controlling the power conversion device 320 to limit the output power Pout. Thereby, the voltage stability may be improved in the system.
In this respect the stabilizer 100 may use one or more stabilization threshold index values for limiting the output power Pout of the power conversion device 320. Thus, the electrical stabilization index may be compared to an associated stabilization threshold index value.
Fig. 3 shows a stabilizer 100 which is also configured to use one or more second measurements MO1 , MO2, ... , MOn at the output 304 of the electrical charger 300 for determining the electrical stabilization index according to embodiments of the disclosure. Thus, the stabilizer 100 may receive such measurements from one or more second sensors 140 configured to provide different types of measurements related to the electrical characteristics at the output 304 of the electrical charger 300. In an alternative, the stabilizer 100 may obtain the second measurements MO1 , MO2,... , MOn in other ways, e.g., from another device (not shown) sending the second measurements MO1 , MO2, ... , MOn via a suitable communication interface to the stabilizer 100.
In such embodiments of the disclosure, the oscillation index as previously described may further be determined based the measured oscillation of an output current or an output voltage at an output 304 of the electrical charger 300.
For determining the electrical stabilization index further measurements and parameters may be considered. Thus, in embodiments of the disclosure, the electrical stabilization index may be determined based on third measurements at an output 404 of the electrical power grid 400 connected to the input 302 of the electrical charger 300. The third measurements may be denoted remote measurements and may be derived at a power substation of the power grid 400. Thus, a communication interface 410 may be arranged from the location of the remote measurements to the stabilizer 100 so that the stabilizer 100 can receive such third measurements. The third measurements may be any of:
• A voltage at the output 404 of the electrical power grid 400;
• A power flow at output 404 of the electrical power grid 400; and/or
• A phase angle of the voltage or current at the output 404 of the electrical power grid 400.
Moreover, in further embodiments of the disclosure, one or more electrical energy storage devices 330 may be connected to the electrical charger 300. The electrical energy storage device 330 is configured to provide an electrical power at the input 102 of the electrical charger 300 when needed. As discussed regarding the implementation aspects of embodiments of the disclosure shown in Fig. 1 and 2, the electrical energy storage device 330 may either be controlled by the stabilizer 100 as shown in Fig. 4 or by the controller 310 as shown in Fig. 5.
In embodiments of the disclosure, the stabilizer 100 may be configured to determine at least one energy storage reference control value and/or at least one energy storage control parameter for at least one energy storage device 330 connected to the electrical charger 300. The energy storage device 330 is configured to provide an electrical power to the input 102 of the electrical charger 300. Hence, the energy storage device 330 may be any power device able to deliver electrical power such as a battery and a capacitor.
In such examples of the disclosure, the energy storage reference control value for the energy storage device 330 is any of:
• A reference voltage value;
• A reference current value;
• A reference real power value; and/or
• A reference reactive power value.
These reference control values are used for controlling the energy storage device 330.
The energy storage control parameter for the energy storage device 330 may be an interfacing converter control parameter since the interfacing converter controls the power flow supplied by the energy storage device 330. In an example, the energy storage device 330 may be controlled to reduce the system stability index, which can be improved by reducing the grid reactive power or reducing the phase angle of the feeder voltage according to the formula: electrical stability index = -
( -K2sin transmission a —ng -le-phase an le )) ■
The feeder or feeder line is the electrical line between the power grid and the electrical charger.
Depending on a power line R/X ratio, where R is the resistance and X is the inductance, the electrical stability index can be dependent on active power or phase angle of the feeder voltage according to the formula: electrical stability index = - - Kipgnd -
(K2cos transmission angle-phase angle )) ■ where KlPgrid and K2 are constant values depending on the network and control parameters, and sin and cos are the sinus and cosines functions, respectively, with input values defined as the difference between the transmission angle and the phase angle.
Fig. 4 shows the case when the stabilizer 100 is configured to directly control the energy storage device 330 based on the energy storage reference control value and/or the energy storage control parameter. Thus, the stabilizer 100 can send control signals to the energy storage device 330 via the control line 130 for controlling the energy storage device 330.
Fig. 5 on the other hand shows the case when the stabilizer 100 is configured to provide the energy storage reference control value and/or the energy storage control parameter to the controller 310 via a communication interface 120. The controller 310 uses the energy storage reference control value and/or the energy storage control parameter for controlling the energy storage device 330 via a control interface 340. Thus, the controller 310 can send control signals to the energy storage device 330 via the control line 340 for controlling the energy storage device 330. Fig. 6 shows an electrical charger 300 according to embodiments of the disclosure. The electrical charger 300 herein disclosed comprises: an input 302 configured to receive an input power Pin from an electrical power grid 400, an output 304 configured to output an output power Pout for charging an electrical mining/construction machine 500, and at least one power conversion device 320 connected between the input 302 and the output 304 and configured to convert the input power Pin to the output power Pout. The electrical charger 300 further comprises a stabilizer 100 according to any embodiments of the disclosure being configured to control the power conversion device 320 based on the at least one reference control value and the control parameter, or a controller 310 configured to receive the at least one reference control value and the control parameter from the stabilizer 100 and to control the power conversion device 320 based on the at least one reference control value and the control parameter. The values of the input power Pin and the output power Pout may be derived from the voltage and the current at the input and at the output, respectively, according to conventional methods known in the art.
As also shown in Fig. 6, the electrical charger 300 may comprise multiple power conversion devices 320 arranged between the input 302 and the output 304. They may be arranged as interconnected power conversion stages between the input 302 and the output 304.
It may further be noted that the electrical charger 300 may include more than one charging links as also shown in Fig. 6. Each charging link may include one or more conversion devices 320 connected between an input 302 and an output 304 of the electrical charger 300. The charging links may be connected to the same or different power grids at the input 302 and connected the same or different mining/construction machines at the output 304.
Fig. 7 shows an electrical stabilizer 100 which is configured to interact with one or more remote electrical chargers 300' according to embodiments of the disclosure. The electrical stabilizer 100 may therefore in an example provide a reference control value and/or a control parameter for a remote power conversion device of a remote electrical charger 300' via a communication interface 120. The reference control value and/or a control parameter may be sent to a controller of the remote electrical charger 300'. The electrical stabilizer 100 may in another example directly control the remote power conversion device 320' via a control interface 130.
Fig. 8 shows a method 200 for a stabilizer 100 according to embodiments of the disclosure. The method 200 comprises the steps of: determining 202 an electrical stabilization index for an electrical power grid 400 connected to an input 302 of an electrical charger 300 based on a measurement at the input 302 of the electrical charger 300; determining 204 at least one of a reference control value and a control parameter for a power conversion device 320 of the electrical charger 300 based on the electrical stabilization index; and controlling 206 the power conversion device 320 based on the at least one reference control value and the control parameter, or providing 208 the at least one reference control value and the control parameter to a controller 310 of the electrical charger 300 configured to control the power conversion device 320.
Embodiments of the method 200 may fully correspond to the embodiments of the stabilizer 100. The method 200 may be executed in a processor of a computer by a computer program with a program code for performing the herein disclosed method when the computer program runs on a computer.
Fig. 9 show examples of electrical mining/construction machine 500 according to embodiments of the disclosure. The electrical mining/construction machine 500 comprises an electrical charger 300 according to any embodiments of the disclosure.
The mining/construction machine 500 may be any type of electrified machine or vehicle used in a mining and/or construction environment/site such as e.g., a drill rig, a truck, a loader, a digging machine, etc. With reference to Fig. 9, the mining/construction machine/vehicle 500 may e.g., be a drill rig, a loading, hauling, and dumping (LHD) machine or a mine truck but is not limited thereto.
Finally, it should be understood that the disclosure 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

1 . A stabilizer (100) for one or more electrical chargers (300), the stabilizer (100) being configured to: determine an electrical stabilization index for an electrical power grid (400) connected to an input (302) of the electrical charger (300) based on a measurement at the input (302) of the electrical charger (300); determine at least one of a reference control value and a control parameter for a power conversion device (320) of the electrical charger (300) based on the electrical stabilization index; and control the power conversion device (320) based on the at least one reference control value and the control parameter, or provide the at least one reference control value and the control parameter to a controller (310) of the electrical charger (300) configured to control the power conversion device (320).
2. The stabilizer (100) according to claim 1 , wherein the electrical stabilization index comprises a voltage stability index determined based on any of: a measured reactive power flow, a voltage magnitude, a phase angle, and a charging power.
3. The stabilizer (100) according to any one of the preceding claims, wherein the electrical stabilization index comprises a synchronization stability index determined based on any of: a measured voltage, a power line impedance, and a phase angle of an injected reference current or a reference voltage.
4. The stabilizer (100) according to any one of the preceding claims, wherein the electrical stabilization index comprises an oscillation index determined based a measured oscillation of an input current or an input voltage at the input (302) of the electrical charger (300).
5. The stabilizer (100) according to claim 4, wherein the oscillation index is further determined based a measured oscillation of an output current or an output voltage at an output (304) of the electrical charger (300).
6. The stabilizer (100) according to any one of the preceding claims, wherein the reference control value is any of: a reference power, a reference current, and a reference voltage.
7. The stabilizer (100) according to any one of the preceding claims, wherein the control parameter is any of: gain of a power control loop, a current control loop, and a voltage control loop.
8. The electrical stabilizer (100) according to any one of the preceding claims, configured to: determine the electrical stabilization index further based a measurement at an output (404) of the electrical power grid (400) connected to the input (302) of the electrical charger (300).
9. The stabilizer (100) according to any one of the preceding claims, configured to: inject a reference current or a reference voltage at the input (302) of the electrical charger (300); and determine the electrical stabilization index based on a measurement at the output (304) of the electrical charger (300) comprising an input current or an input voltage added with the reference current or the reference voltage.
10. The stabilizer (100) according to any one of the preceding claims, configured to: determine the reference control value and the control parameter based on the electrical stabilization index and an associated stabilization threshold index value.
11 . The stabilizer (100) according to any one of the preceding claims, configured to: limit an output power (Pout) of the power conversion device (320) based on the electrical stabilization index.
12. The stabilizer (100) according to claim 11 , configured to: limit the output power (Pout) of the power conversion device (320) based on the electrical stabilization index and a stabilization threshold index value.
13. The stabilizer (100) according to any one of the preceding claims, configured to: determine at least one energy storage reference control value and/or at least one energy storage control parameter for at least one energy storage device (330) connected to the electrical charger (300) and configured to provide an electrical power to the input (102) of the electrical charger (300).
14. The stabilizer (100) according to claim 13, wherein the energy storage reference control value for the energy storage device (330) is any of: a reference voltage, a reference current, a reference real power, and a reference reactive power.
15. The stabilizer (100) according to claim 13 or 14, wherein the energy storage control parameter for the energy storage device (330) is an interfacing converter control parameter.
16. The stabilizer (100) according to any one of claims 13 to 15, configured to control the energy storage device (330) based on the least one energy storage reference control value and/or at least one energy storage control parameter.
17. An electrical charger (300) comprising: an input (302) configured to receive an input power (Pin) from an electrical power grid (400), an output (304) configured to output an output power (Pout) for charging a electrical mining/construction machine (500), and at least one power conversion device (320) connected between the input (302) and the output (304) and configured to convert the input power (Pin) to the output power (Pout); wherein the electrical charger (300) comprises: a stabilizer (100) according to any one of the preceding claims configured to control the power conversion device (320) based on the at least one reference control value and the control parameter, or a controller (310) configured to receive the at least one reference control value and the control parameter from the stabilizer (100) and to control the power conversion device (320) based on the at least one reference control value and the control parameter.
18. The electrical charger (300) according to claim 17, comprising multiple power conversion devices (320) arranged between the input (302) and the output (304).
19. The electrical charger (300) according to claim 18, wherein the multiple power conversion devices (320) are arranged as interconnected power stages between the input (302) and the output (304).
20. An electrical mining/construction machine (500) comprising an electrical charger (300) according to any one of claims 17 to 19.
21 . A method (200) for a stabilizer (100), the method (200) comprising: determining (202) an electrical stabilization index for an electrical power grid (400) connected to an input (302) of an electrical charger (300) based on a measurement at the input (302) of the electrical charger (300); determining (204) at least one of a reference control value and a control parameter for a power conversion device (320) of the electrical charger (300) based on the electrical stabilization index; and controlling (206) the power conversion device (320) based on the at least one reference control value and the control parameter, or providing (208) the at least one reference control value and the control parameter to a controller (310) of the electrical charger (300) configured to control the power conversion device (320).
22. A computer program with a program code for performing a method according to claim 21 when the computer program runs on a computer.
PCT/SE2024/050687 2024-07-15 2024-07-15 Stabilizer for an electrical charger and method thereof Pending WO2026019348A1 (en)

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