JP2023523471A - Energy management system and method - Google Patents

Abstract

Kind Code: A1 The present disclosure relates to a power management device (DR box). The power management device determines the amount of power transferred from the power grid to the one or more batteries (110) and/or the power transferred from the one or more batteries to the power grid based on at least the state of charge of the one or more batteries. generating a battery power setting value indicative of a quantity; generating a battery power setting limit value based at least on a power consumption level of the client site (102); comparing the battery power setting value to the battery power setting limit value; and, if the battery power setpoint exceeds the battery power setpoint limit, the battery power setpoint is reduced to a value less than or equal to the battery power setpoint limit. [Selection diagram] Fig. 1

Description

TECHNICAL FIELD This disclosure relates generally to the field of electronic power management devices and systems, and more particularly to devices, systems and methods for power management at one or more sites.

Power grids are constantly challenged to balance the demand and supply of the power grid to avoid overloads that can lead to power outages.

In recent years, sites with relatively high consumption of electrical energy have been financially incentivized to agree to limit the power they draw from the grid during peak demand periods. This allows sites to obtain more competitive prices for the electrical energy they purchase, for example.

Some sites may have relatively flexible energy requirements and be able to accommodate temporary reductions in power supply from the grid.

For less flexible sites, another solution is to equip the site with large-capacity batteries that can be charged from the grid when power demand is low and supplement power supplied by the grid when power demand is high. be.

However, managing the power consumption of such sites in real time or near real time is technically difficult. Accordingly, there is a need in the art for power management solutions and methods that are relatively low cost and have relatively fast response times.

It is an objective of embodiments of the present disclosure to at least partially address one or more needs in the art.

According to one aspect, a power management apparatus is provided. A power management unit determines the amount of power and/or power transferred from the power grid to the one or more batteries configured to store electrical energy at a client site of the power grid based at least on the state of charge of the one or more batteries. or generating a battery power setpoint indicative of the amount of power transferred from the one or more batteries to the power grid, and generating a limit value for the battery power setpoint based at least on the power consumption level of the client site; comparing the battery power setpoint to the battery power setpoint limit, and if the battery power setpoint exceeds the battery power setpoint limit, the battery power setpoint is set to the battery power setpoint limit. and applying said battery power set point to said one or more batteries.

According to one embodiment, the power management device controls the reactive power Qsite consumed by said client site, the active power Pind of one or more loads of said client site, and the limit value S_lim of the total apparent power of said client site. Based on this, the limit value Plim_sp of the battery power setpoint is generated.

According to one embodiment, the power management device is configured to generate the limit value (Plim_sp) of said battery power set point based on the following formula:

According to one embodiment, the client site comprises at least one power generation device, and the power management device is configured to generate the battery power set point limit also as a function of the power generated by the power generation device. is configured to

According to one embodiment, the power management device is further configured to generate said battery power set point based on a demand level of said power grid.

According to one embodiment, the power management device is configured to detect the level of power imbalance of the power grid by detecting the frequency deviation of the alternating voltage supplied from the power grid to the client site. .

According to one embodiment, the power management device is configured to detect the power consumption level of said client site by reading at least one power meter of said client site.

According to one embodiment, the power management device is further configured to generate said battery power set point based on a programmed battery charging or discharging operation.

According to one embodiment, the power management unit is further configured to communicate with a central system to receive programming data regarding programmed battery charging or discharging operations.

According to one embodiment, the battery power setpoint is indicative of the amount of power transferred from the power grid to the one or more batteries, and the battery power setpoint limit is a battery charging power setpoint limit. and the power management unit is further configured to generate another battery power setpoint indicative of the amount of power transferred from the one or more batteries to the power grid based at least on the state of charge of the one or more batteries. generating a battery discharge power setting limit value based at least on the power consumption level of the client site; comparing the other battery power setting value to the battery discharge power setting limit value; if the battery power set value exceeds the battery discharge power set value limit value, the other battery power set value is decreased to a value equal to or less than the battery discharge power set value limit value, and the other battery power set value to the one or more batteries.

According to another aspect, a power management system is provided. The power management system comprises a central system and a plurality of client sites, each client site comprising a power management device as described above, the central system being configured to communicate with each power management device.

According to one embodiment, the central system comprises a control and data acquisition system and a distributed resource management system communicating with said control and data acquisition system.

According to yet another aspect, a power management method is provided. A power management method is transmitted by a power management device from the power grid to the one or more batteries configured to store electrical energy at a client site of the power grid based at least on the state of charge of the one or more batteries. and/or generating a battery power setpoint indicative of the amount of power transferred from the one or more batteries to the power grid; generating a battery power setpoint limit; comparing, by the power management device, the battery power setpoint to the battery power setpoint limit; reducing, by the power management device, the battery power setpoint to a value less than or equal to the battery power setpoint limit if the value limit is exceeded; and reducing the battery power setpoint by the power management device. and applying to the one or more batteries.

According to one embodiment, the battery power setpoint is indicative of the amount of power transferred from the power grid to the one or more batteries, and the battery power setpoint limit is a battery charging power setpoint limit. and the method further comprising generating another battery power setpoint indicative of the amount of power transferred from the one or more batteries to the power grid based at least on the state of charge of the one or more batteries. generating a battery discharge power setting limit based at least on a power consumption level of said client site; comparing said other battery power setting with said battery discharge power setting limit; if the other battery power setpoint exceeds the battery discharge power setpoint limit, then reducing the other battery power setpoint to a value less than or equal to the battery discharge power setpoint limit; to the one or more batteries.

These and other features and advantages are described in detail in the following specific embodiments, given by way of non-limiting illustration of the invention, with reference to the accompanying drawings.

1 is a block diagram illustrating a power supply system according to an exemplary embodiment of the present disclosure; FIG. 1 is a one-line diagram illustrating a client site electrical supply circuit in accordance with an exemplary embodiment of the present disclosure; FIG. 2 is a block diagram illustrating the controller of FIG. 1 in more detail, in accordance with an exemplary embodiment of the present disclosure; FIG. 4 is a flowchart illustrating operation of a power management method according to an exemplary embodiment of the present disclosure; Figure 5 is a block diagram representing software modules configured to implement the method of Figure 4; 4 is a flow chart illustrating the operation of a power management method according to another exemplary embodiment;

Similar features are indicated by similar reference numerals in the various drawings. In particular, structural and/or functional features common to various embodiments may have the same reference numerals and may have the same structural, dimensional and material properties.

Unless otherwise specified, a reference to two elements being connected means that they are directly connected with no intermediate element other than a conductor; It means that these two elements may be connected or may be connected via one or more other elements.

In the following disclosure, absolute positions such as "front", "back", "top", "bottom", "left", "right" or "upper", "lower", "upper", "upper", "lower", "upper", unless otherwise specified. When referring to relative position-defining terms such as "underlying" or to directional-defining terms such as "horizontal", "vertical", etc., reference is made to the directions shown in the figures.

Unless otherwise specified, the terms "about," "substantially," and "as much as" mean within 10%, preferably within 5%.

FIG. 1 is a block diagram illustrating a power delivery system 100 according to an exemplary embodiment of the present disclosure.

In the example of FIG. 1 , power supply system 100 comprises two client sites 102 , 104 , central power management system 106 , market server 107 and grid operator server 108 .

A client site in power supply system 100 corresponds to a site that includes electrical loads and/or electrical energy storage devices, and electrical energy is transmitted from the power grid to the client site and/or from the client site to the power grid. For example, one or more power supply contracts involving the client site 102, 104 and the operator of the power grid are entered into to establish a commercial relationship between the entities. Although two client sites 102, 104 are illustrated in the embodiment of FIG. 1, in alternate embodiments, any number of client sites managed by the central power management system 106 may be used.

Each of the client sites 102, 104 comprises flexible electrical energy resources, in other words electrical loads and/or electrical energy storage devices that can be adapted to current and future needs.

In the example of FIG. 1, client site 102 comprises an electrical energy storage device and an electrical load, and client site 104 comprises a power generation device and an electrical load. However, a site may comprise both electrical energy storage and power generation in addition to electrical loads, or may comprise only electrical loads, power generation or electrical energy storage.

For example, the client site 102 comprises a high-capacity battery bank 110, which can input or output electrical energy up to, for example, 10 MW, and has a storage capacity of, for example, greater than or equal to 10 kWh and less than or equal to 20 MWh. The battery bank 110 is coupled, for example, via a battery management system 112, to an on-site supervisory control interface 114, hereinafter referred to as a demand response box, or simply DR box. DR box 114 is, for example, a programmable logic controller (PLC) and is configured to perform energy management, for example, similar to the role of an energy management system (EMS).

Client site 102 also includes one or more electrical loads 118 , such as shown at the factory in the example of FIG. For example, electrical loads 118 may include loads corresponding to electrical machines, lighting, industrial ovens or other forms of heating systems, refrigeration systems and/or cooling systems such as air conditioning, and/or other forms of electrical energy consumption loads. of industrial loads. For example, one or more electrical loads 118 have a total maximum consumption of 100 kW to 400 MW, or greater than 400 MW. However, in some embodiments, there is some flexibility in the level of power consumed by client site 104 . For example, consumption may be reduced from the maximum consumption level by at least 50 kW, and in some embodiments up to tens of megawatts or more.

The DR box 114 is coupled to one or more on-site meters 116, for example, for monitoring single-phase and/or three-phase active and reactive power and/or other electrical characteristics. For example, the on-site meter 116 may include one or more electric meters that monitor current supplied to and/or from the site, one or more electrical meters that monitor current supplied to or drawn from the battery bank 110. , one or more electricity meters that monitor the phase of electrical signals, and one or more AC (alternating current) frequency meters that monitor the frequency of the electrical supply voltage present on the power grid as viewed from the client site 102 . Other properties that can be measured include electrical energy and power factor. DR box 114 is configured, for example, to obtain meter data from these meters 116 . Further, DR box 114 is configured to provide a communication interface between client site 102 and central power management system 106, for example.

DR box 114 may communicate with central power management system 106 and possibly client devices, for example, via the Internet. For example, although not shown in FIG. 1, the connection between DR box 114 and the Internet may be via a switched communications network such as an ADSL (Asymmetric Digital Subscriber Line) modem, or a wireless connection including, for example, a cellular communications network. .

Client site 104 includes, for example, DR box 114 and one or more meters 116 that serve similar roles as those of client site 102 and will not be described in detail again. Client site 104 also includes one or more electrical loads 118 , eg, similar to electrical load 118 of client site 102 , coupled to DR box 114 via one or more PLCs 120 . Further, in the example of FIG. 1, client site 104 includes one or more power generators 122, which may be, for example, photovoltaic generators, wind turbines, gensets, or other types of power generators. is.

Although one DR box 114 is provided at each client site 102, 104 in the example of FIG. 1, some sites may have multiple DR boxes 114 in alternative embodiments.

The central power management system 106 is responsible for, for example, receiving data from each DR box 114 and providing control signals to the client sites 102, 104 via the DR box 114, for example a supervisory control and data acquisition system (SCADA). is a control and data acquisition system 128 . In particular, the SCADA 128 sends control signals to the DR boxes of the client sites 102, 104, for example, to control power supplied to or from the site and/or power applied to or drawn from the battery bank 110. responsible for the function of sending SCADA 128 is also responsible for, for example, acquiring and storing data measurements from client sites 102, 104, and, if the site includes batteries, providing information about the state of the site, such as the state of charge of battery bank 110. Responsible for acquiring and storing functions.

The central power management system 106 also includes, for example, a distributed energy resource management system (DERMS) 130, which, for example, coordinates resource operations in relation to various client site loads or batteries of the power distribution system 100. A configured computer platform. DERMS 130 also provides an interface with market server 107 and an interface with grid operator server 108, for example.

For example, the market server 107 provides information regarding electricity prices for current and/or future time periods and also provides information regarding activations requested by the grid operator server 108 .

A power grid operator server 108 corresponds, for example, to a computer platform of a power grid operator that supplies power to a client site. In Europe, a grid operator corresponds, for example, to a Transmission System Operator (TSO) (“Gestionnaire du Reseau de Transport”—GRT in French) and/or to a Distribution System Operator (DSO). For example, grid operator server 108 provides activation instructions to DERMS 130 , and DERMS 130 provides monitoring data and/or control data, such as load conditions, to grid operator server 108 .

DERMS 130 takes into account power prices for current and/or future time periods, e.g., to reduce energy costs and/or generate revenue at client sites, e.g., through metered rate reductions or balancing services to the power grid. to determine how power usage at the client site can be adapted. For example, the DERMS 130 may prioritize charging the battery bank 110 from the grid, e.g., given relatively low power prices, and discharging the battery bank 110 to the power grid, e.g., given relatively high power prices. is configured to send a control signal to the client site indicating a period of time during which priority should be given to

FIG. 2 is a single line diagram illustrating a client site electrical supply circuit 200 comprising both an electrical load and an electrical energy storage device, according to an exemplary embodiment of the present disclosure.

A high voltage supply (HV supply) from the power grid, for example, is applied at input node 202 and coupled to bar 206 via switch 204 . Bar 206 is in turn coupled via circuit breaker 208 to another bar 210 that is used to supply a load and battery system 211 . The circuit breaker 208 is, for example, motorized (M) and can be remotely operated.

In the example of FIG. 2, there are two load groups, sector 1 loads and sector 2 loads.

Sector 1 loads are fed from bar 210 through a series connection of switch 212 , high voltage to low voltage converter (HV/LV converter) 214 , circuit breaker 216 and power panel 218 .

Similarly, the Sector 2 load is supplied from bar 210 through a series connection of switch 222 , HV/LV converter 224 , circuit breaker 226 and feed panel 228 .

In the example of FIG. 2, the battery system 211 comprises two battery subsystems, one formed by battery racks RK1-RK4 and one formed by battery racks RK5-RK8, these battery racks being for example shown in FIG. It forms part of one battery bank 110 . Battery racks, for example, each comprise modules formed of battery cells. Battery system 211 includes, for example, an internal bar 230 coupled to bar 210 via a series connection of switch 232 , HV/LV converter 234 and circuit breaker 236 . Bar 230 is coupled via power conversion system 238 and switch 240 to battery racks RK1-RK4 and via power conversion system 242 and switch 244 to battery racks RK5-RK8. Power conversion systems 238, 242, for example, perform AC/DC conversion.

In some embodiments, one or more current converters 246, 247 are provided between the circuit breaker 208 and the bar 210, for example. The current transducer 246 provides, for example, current measurement protection (I protection). Current transducer 247 is used, for example, for measurement. Similarly, bar 206 is coupled to voltage converter 248 via, for example, a fuse, one of the secondary sides of voltage converter 248 is used for voltage measurement protection and the other is used to drive the other fuse. used for measurement via For example, the secondary of current transducer 247 and the secondary of voltage transducer 248 are provided to transducer 250 for measurement.

FIG. 3 is a block diagram of a portion of DR box 114 of client site 102, 104 of FIG. 1, according to an exemplary embodiment of the present disclosure.

DR box 114 includes a processing unit 302 that includes one or more processors, eg, one or more microprocessors or microcontrollers. DR box 114 further comprises memory 304 and input/output interface 306 linked to processing unit 302 via bus 308 . For example, memory 304 is a non-volatile memory such as flash memory and stores firmware that is executed by processing unit 302 to implement the functionality of DR box 114 . The DR box 114 may further comprise volatile memory such as RAM (random access memory), for example DRAM (dynamic random access memory) or SRAM (static random access memory).

The operation of DR box 114 will now be described in more detail with reference to FIGS.

FIG. 4 is a flow chart illustrating operation of a method of power management according to an exemplary embodiment of the present disclosure. The method of FIG. 4 is performed at least in part by DR box 114, for example. The method is performed on the input data in real-time, for example at the client site. The term "real-time" refers to a system in which the system's output response is delayed only by the system's data processing delays. For example, the method is executed every t seconds, where t is eg 10 ms to 1 minute, eg about 1 second.

In operation 401, a battery power setpoint Psp is generated that indicates the amount of power supplied from the power grid to a battery, such as the battery bank 110 described above. This set value is expressed in kW, for example. If the battery bank 110 is charged from the grid, the battery power setpoint Psp is for example positive, whereas if the battery is discharged to the grid the battery power setpoint Psp is for example negative. The battery power setpoint Psp is generated, for example, based on the state of charge of the battery bank 110, as described in more detail below. In some embodiments, the battery power setpoint Psp is also generated based on the level of power imbalance of the power grid determined, for example, by detecting the frequency deviation of the AC voltage on the power grid. The battery power setpoint Psp may additionally or alternatively be based on a programmed operation of charging the battery from the power grid and/or discharging the battery to the power grid. For example, such programmed behavior is set by a central power management system 106, such as DERMS 130, to generate site savings and/or revenue, for example, through reduced usage charges or balancing services to the power grid.

In operation 402, the battery power set point limit Plim_sp in kW is determined, as will be described in more detail below.

In the following, Pbat represents the battery active power, Pind represents the active power of the industrial load of the site, Psite represents the active power consumed by the site, Psite = Pbat + Pind, S_lim is the administrative apparent power limit, Expressed in kVA, Qsite is the reactive power consumed by the site and Ssite is the apparent power consumed by the site, expressed in kVA.

The value S_lim is, for example, a limit based on the client site's power contract, imposed by one or more circuit breakers, such as circuit breaker 208 in FIG. May be triggered when an attempt is made to withdraw.

The apparent power Ssite consumed by the site is preferably less than or equal to the limit value S_lim. The apparent power Ssite is a function of the active power Psite and the reactive power Qsite. Therefore, in some embodiments, the limit value Plim_sp is determined based on the following calculations.

The battery power setpoint limit value Plim_sp defined above corresponds, for example, to a limit value that is applied during charging of the battery, in other words while power is being transferred from the power grid to the battery bank 110 . A limit value for the battery discharge power setpoint can also be generated in a similar manner based on the same formula during battery discharge, in other words while power is being transferred from the battery bank 110 to the power grid. In the case of discharging, the setpoint limit value Plim_sp is, for example, a negative limit value.

Also, if there is a power generation device in the site, it is possible to increase the limit value Plim_sp of the battery power by the power generation amount.

In operation 403 the limit value Plim_sp is compared with the set value Psp, in particular it is determined whether Psp is greater than Plim_sp. If the battery power setpoint Psp is greater than the limit Plim_sp, then in operation 404 the power setpoint Psp is reduced to less than or equal to Plim_sp and applied to the battery bank 110, but the battery power setpoint Psp is less than the limit. If Plim_sp has not been exceeded, in operation 405 the battery power set point Psp is applied, eg, unmodified. For example, applying the battery power set point Psp to the battery bank 110 includes generating a control signal by the DR box 114 and outputting it to the battery bank 110 via, for example, the battery management system 112 . This can be, for example, an AC/DC converter, a DC/AC converter, and/or a combined AC/DC/AC converter with bi-directional capability to transfer power in the appropriate direction between the power grid and the battery bank 110 . One or more voltage converters, such as converters, will be activated. For example, these transducers correspond to transducers 238 and 242 in FIG.

The advantage of calculating a battery power limit value Plim_sp based on consumption at the client site and limiting the battery power set point to the calculated limit value is that while the battery is being charged from the network or powering an industrial load to avoid exceeding the site's apparent power limit S_lim while being discharged to do so. Furthermore, by calculating and applying this limit locally at the client site using the DR box 114, the response to fluctuating levels of power consumption at the client site is faster and there is less overhead between the DR box 114 and the central management system. It is possible to avoid the risk of any communication delay in

FIG. 5 is a block diagram representing software modules configured to implement the method of FIG. The elements of FIG. 5 are implemented, for example, by the DR box 114 described above.

The data acquisition module 502 receives input data including meter data from one or more of the meters 116 described above, e.g., battery data indicating the state of charge of the battery bank 110, and offsite commands, such as commands from the central power management system 106. to receive The meter data is energy, e.g., in the form of current, consumed by the client site 102 over a predetermined period of time, e.g., one second, and supplied to or drawn from the battery bank 110 over a predetermined period of time. It also contains information about energy, for example in the form of electric current. Meter data also includes, for example, measurements of the frequency of the AC voltage received from the power grid. The offsite command may, for example, indicate when battery charging or battery discharging operations should be prioritized, and may include power settings received from an external source (eg, DERMS 130).

Data acquisition module 502 is configured to generate various data values for use by other algorithms of the device, eg, based on meter data, external commands, and other received data. For example, the data acquisition module 502 is responsible for acquiring current measurements, energy measurements, and real, apparent, or reactive power values.

Algorithm management module 504 distributes, for example, data values provided by data acquisition module 502 to various algorithms 506 responsible for calculating battery power set point Psp. Algorithm management module 504 is also responsible for, for example, determining when battery power management should be enabled or disabled. For example, during certain periods of the day or week, battery power management can be disabled, eg, when power prices or client site power consumption are low. Algorithm management module 504 is also configured to check the status of the system, eg, whether any input data is unavailable, whether there is a data connection with a central management system, and the like. These may trigger disabling of some or all of the battery power management algorithms.

In the example of FIG. 5, the algorithms 506 responsible for calculating the battery power setpoint Psp include a battery charge algorithm 508, a battery discharge algorithm 510, a frequency adjustment algorithm 512, a flow maintenance algorithm 514, a charge level management algorithm 516 and a setpoint aggregation algorithm 518. including.

The battery charging algorithm 508 generates a power setpoint that indicates, for example, the power level in kW at which the battery bank is charged. For example, the algorithm receives the start and end dates and times of the charging period, as well as the current state of charge of the battery bank and the maximum amount of energy the battery bank can store. The algorithm calculates, for example, the amount of energy stored in the battery bank during the charging period and based on this information the power level to be applied during charging.

Battery discharge algorithm 510 operates in a similar manner as battery charge algorithm 508, except that the power set point generated indicates the level at which the battery bank is discharged and supplied to the power grid.

A frequency adjustment algorithm 512, for example, determines a power set point for adjusting the frequency of AC voltage on the power grid. For example, the frequency adjustment algorithm 512 receives the measured frequency in Hz and the battery status indicating, for example, whether the battery charge is high or low. If the battery condition is neither high nor low, the power setpoint is generated at, for example, K*(Freq-50Hz), where K is the adjustment gain in kW/Hz. In some embodiments, gain K is set to a value in the range of 200 kW/Hz to 50 MW/Hz, such as about 1 MW/Hz.

A maintain flow algorithm 514 is used, for example, to maintain a balance of state of charge between the various battery racks of the battery bank 110 . In practice, each battery rack has a corresponding state of charge, and to ensure safe operation, for example, it is preferred that these states of charge are relatively close to each other.

Charge level management algorithm 516 is used, for example, to charge battery bank 110 to a target level, eg, 50% of full charge, at some point during frequency adjustment. For example, charge level management algorithm 516 generates a power setpoint when the AC frequency of the power grid is in a deadband equal to, for example, 49.985-50.015 Hz. For example, the algorithm generates power setpoints to charge the battery bank 110 if the state of charge is below the target level and to discharge the battery bank 110 if the state of charge is above the target level. In some embodiments, the target level may be a target range, such as 48-52% state of charge, and the power setting may vary as a function of the distance between the current state of charge and the target state of charge. .

A setpoint aggregation algorithm 518 generates an overall power setpoint Psp based, for example, on the sum of each of the power setpoints generated by each of algorithms 508-516. Also, the setpoint aggregation algorithm 518 also applies the method described in connection with FIG. 4 to limit the power setpoint based on, for example, the battery bank 110 capability.

The safety setpoint transmission algorithm 520 is responsible for, for example, applying the power setpoint to the battery bank 110 only when the conditions of the battery bank 110 and, for example, the DR box 114 itself are permissible, which may include, for example: It means that neither battery bank 110 nor DR box 114 has asserted a warning signal.

FIG. 6 is a flowchart illustrating operation of a method of power management according to another exemplary embodiment. In particular, the method of FIG. 6 is implemented, for example, by DR box 114 described above.

In operation 601, data acquisition and pre-processing are performed and correspond, for example, to the operations of data acquisition module 502 of FIG.

At operation 602, the presence or absence of alarms, mechanism status such as open or closed switch mechanisms, and inhibit checks are performed prior to activating the battery management system. These checks are performed, for example, by algorithm management module 504 of FIG.

If any of the checks in action 602 fail (NOK), then in action 603 the battery bank 110 is considered unusable and, for example, the method restarts in action 601 after a waiting period. However, if all checks are OK (OK), the next action is 604 .

In operation 604, it is determined whether the state of charge (SOC) of battery bank 110 is within an acceptable range. If the SOC is not within tolerance, then at operation 605 battery bank 110 is charged or discharged until it is within tolerance, for example. The tolerance may depend on the need for other functions, eg emergency power supply, and technical safety constraints, eg to avoid damaging the battery cells. However, if the SOC is within the acceptable range, then at operation 606 one or more monetization algorithms are applied, such as, for example, battery charge algorithm 508, battery discharge algorithm 510, and frequency adjustment algorithm 512 described above. For example, these algorithms may launch applications based on time and schedule, calculate settings based on SCADA inputs and local algorithms, and/or generate results and between applications and/or constraints. including merging conflicts. SCADA inputs, for example, may be commands received from central power management system 106, generated, for example, by DERMS 130, indicating periods during which battery charging or discharging operations should be prioritized, and/or applied during charging or discharging. Contains the desired power setting.

After operations 605 and 606, a charge limiting operation 607 or a discharge limiting operation 608 is performed, eg, charging/discharging indicated by the generated battery power set point is limited, eg, based on the current in the grid connection. This corresponds, for example, to the limits applied by the method of FIG. The value is related to the site's apparent power limit S_lim.

Next, at operation 609, the method includes applying the power setting to the battery bank 110, for example, by command entry in the battery bank's setting register. The method then returns to operation 601, eg, when the next set of input data is available.

Various embodiments and variations have been described. Those skilled in the art will appreciate that certain features of these embodiments can be combined and other variations will be apparent to those skilled in the art. For example, those skilled in the art will appreciate that the methods described herein can be applied to client sites having any number of battery banks, one or more loads, and possibly one or more power generation devices. would be clear to Further, the method may be implemented by multiple power management units or DR boxes at different locations at the client site, communicating with each other, eg, via SCADA or other centralized hardware.

Finally, practical implementation of the embodiments and variations described herein is within the capabilities of those skilled in the art based on the functional description provided herein.

This patent application claims priority from French Patent Application No. 20/04325 filed on April 30, 2020, the entire content of which is incorporated herein by reference.

Claims (14)

A power management device (DR box),
transmitted from the power grid to the one or more batteries (110) based at least on the state of charge of the one or more batteries (110) configured to store electrical energy at a client site (102) of the power grid. generating a battery power set point (Psp) indicative of the amount of power and/or the amount of power transferred from the one or more batteries to the power grid;
generating a battery power set point limit (Plim_sp) based at least on a power consumption level (Qsite, Pind) of the client site (102);
comparing the battery power setpoint (Psp) to the battery power setpoint limit (Plim_sp);
When the battery power set value (Psp) exceeds the battery power set value limit (Plim_sp), the battery power set value (Psp) is decreased to a value below the battery power set value limit (Plim_sp). let
A power management device configured to apply the battery power set point (Psp) to the one or more batteries (110). Based on the reactive power Qsite consumed by the client site, the active power Pind of one or more loads (118, 218, 228) of the client site, and the total apparent power limit S_lim of the client site, the battery 2. The power management device of claim 1, configured to generate a power setpoint limit value Plim_sp. 3. The power management device of claim 2, configured to generate the battery power set point limit (Plim_sp) based on the following equation:

The client site comprises at least one power generation device (122), and the power management device generates a limit value (Plim_sp) for the battery power set point also as a function of the power generated by the power generation device (122). 4. A power management apparatus as claimed in any one of claims 1 to 3, configured to: 5. A power management device according to any one of the preceding claims, further configured to generate said battery power set point (Psp) based on a demand level of said power grid. 6. Power management according to claim 5, configured to detect a level of power imbalance in the power grid by detecting a frequency deviation in alternating voltage supplied from the power grid to the client site (102). Device. 7. Any one of claims 1 to 6, configured to detect the power consumption level (Qsite) of the client site (102) by reading at least one power meter (116) of the client site. The power management device according to . 8. A power management apparatus according to any one of the preceding claims, further configured to generate said battery power set point (Psp) based on programmed battery charging or discharging operations. 9. The power management apparatus of claim 8, further configured to communicate with a central system (106) to receive programming data regarding programmed battery charging or discharging operations. The battery power setpoint (Psp) indicates the amount of power transferred from the power grid to the one or more batteries (110), and the battery power setpoint limit is a battery charging power setpoint limit. and the power management device further comprises:
generating another battery power setpoint (Psp) indicative of the amount of power transferred from the one or more batteries (110) to the power grid based at least on the state of charge of the one or more batteries (110);
generating a battery discharge power set point limit based at least on a power consumption level (Qsite, Pind) of the client site (102);
comparing the other battery power setpoint (Psp) to the battery discharge power setpoint limit;
When the other battery power set value (Psp) exceeds the limit value of the battery discharge power set value, the other battery power set value (Psp) is set to be less than or equal to the limit value (Plim_sp) of the battery discharge power set value. value,
A power management device according to any one of the preceding claims, arranged to apply said other battery power set point (Psp) to said one or more batteries (110). a central system (106);
a plurality of client sites (102, 104);
Each client site comprises a power management device (114) according to any one of claims 1 to 10, and the central system (106) is arranged to communicate with each power management device (114). , power management system. The central system (106)
a control and data acquisition system (128);
12. The power management system of claim 11, comprising: a distributed resource management system (130) in communication with the control and data acquisition system. The one or more batteries (110) configured to store electrical energy at a client site (102) of the power grid by a power management device (114) are removed from the power grid based at least on the state of charge of the one or more batteries (110). generating a battery power setpoint (Psp) indicative of the amount of power transferred to a battery (110) and/or the amount of power transferred from the one or more batteries to the power grid;
generating, by the power management device, a battery power set point limit (Plim_sp) based at least on a power consumption level (Qsite; Pind) of the client site (102);
comparing, by the power management device, the battery power set point (Psp) to a limit value of the battery power set point (Plim_sp);
When the battery power set value (Psp) exceeds the battery power set value limit value (Plim_sp), the power management device reduces the battery power set value (Psp) to the battery power set value limit value (Plim_sp). ) to a value of
applying, by the power management device, the battery power set point (Psp) to the one or more batteries (110). The battery power setpoint (Psp) indicates the amount of power transferred from the power grid to the one or more batteries (110), and the battery power setpoint limit is a battery charging power setpoint limit. Yes, the method further comprising:
generating another battery power setpoint (Psp) indicative of the amount of power transferred from the one or more batteries (110) to the power grid based at least on the state of charge of the one or more batteries (110);
generating a battery discharge power set point limit based at least on a power consumption level (Qsite, Pind) of the client site (102);
comparing the other battery power setpoint (Psp) to the battery discharge power setpoint limit;
When the other battery power set value (Psp) exceeds the limit value of the battery discharge power set value, the other battery power set value (Psp) is set to be less than or equal to the limit value (Plim_sp) of the battery discharge power set value. decreasing to a value;
14. The power management method of claim 13, comprising: applying said other battery power set point (Psp) to said one or more batteries (110).

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