EP3227982A1

EP3227982A1 - Power management method

Info

Publication number: EP3227982A1
Application number: EP15817464.9A
Authority: EP
Inventors: Christophe GOASGUEN
Original assignee: Imeon Energy
Current assignee: Imeon Energy
Priority date: 2014-12-02
Filing date: 2015-12-02
Publication date: 2017-10-11
Also published as: AU2015356852A1; FR3029326B1; CN107210606A; US20170310112A1; AU2020202251A1; CN107210606B; WO2016087781A1; FR3029326A1; US10431985B2

Abstract

The invention relates to a power management method, characterised in that it includes the following steps: a) measuring the voltage and current of a power source (20), of an electrical output (23) and of a battery (21); b) calculating the power produced by the power source (20), the power drawn by the electrical output (23) and the power exchanged with the battery (21); c) connecting the power source (20), the electrical output (23), the battery (21) and an electrical grid (22); and d) transmitting to a monitoring device electricity generation measurements and consumption information and information on whether it is possible to remotely control a number of systems. In a step e), the electrical output (23) is connected to the power source (20), the battery (21) or to the electrical grid (22) depending on information on the mains-grid kWh unit rate, such as whether it is peak or off-peak.

Description

Method for energy management

TECHNICAL FIELD OF THE INVENTION

The present invention relates to the field of renewable energies, and more particularly the use of the production of renewable energy for self-consumption.

STATE OF THE ART

The following types of systems are known: on grid (in French connected to the network), and off grid (in French, off-grid).

On-grid systems are systems that produce energy on an available grid. With this type of system, it is only possible to inject the production to the network. No storage is possible.

Off-grid systems are not connected to a public grid and are not considered to be connected to the main or national grid. With this type of system, it is only possible to store and / or self-consume the production. No injection to the network is possible. In this type of system, it is necessary to use a charge controller that includes additional losses over the entire system.

Off-grid systems also use the all-or-nothing principle for electrical output either by batteries or by the public electricity grid. These power relays create micro-cuts when they transfer energy from one source to another.

The off-grid inverters have an identical power input and output, that is to say that the cumulative power of the output loads is limited.

An off-grid system consists of several elements, which involves complex wiring and a large system.

It is known from US201 1/140667 a method of energy management with consideration of solar panels. The method described in this document makes it possible to control either the injection of an electrical power from the solar panel or the battery to a residence or to the electrical network, or the consumption of an electric power on the public network. to charge the battery, according to a predetermined reference level of power consumed by the residence or the electrical network. This is a process designed to ensure that the delivery point (the electricity meter of the public electricity grid) measures the most constant power consumption at any time of the day and in any possible situation with respect to to the consumption of the residence or the local electrical network, the production of the solar panel and the energy stored in the battery. Thus, the method injects current from the solar panel or the battery to the residence or the local electrical network if the power consumed by the residence or the local electrical network is greater than the predetermined power reference. The method consumes power from the public electricity network to charge the battery if the power consumed by the residence or the local power network is less than the predetermined power reference. The method is composed of at least one battery cell of electrochemical accumulator technology.

However, this document does not show how to optimize the management of energy flows in order to minimize the cost of the kWh produced by the energy source. There is no, for example, the possibility of:

- Use the production of solar panels to at the same time feed the electrical output, the public electricity network and charge the battery

- Charge the battery at the same time by photovoltaic production and the public electricity network

- Power the electrical output at the same time with the production of solar panels, battery and the public electricity network

- Power the public electricity network at the same time by producing solar panels and batteries.

There is no possibility of using batteries other than battery electrochemical technology, such as storage by flywheel.

OBJECT OF THE INVENTION

The present invention aims to remedy these disadvantages. For this purpose, according to a first aspect, the present invention aims at a method of energy management, characterized in that it comprises the following steps:

- a) measuring the voltage and current of a power source, an electrical output and a battery;

- b) calculation of the power produced by the power source, the power consumed by the electrical output and the power exchanged with the battery;

- c) connection between the power source, the electrical output, the battery and an electrical network:

the power source is connected to the electrical output for powering it, if the power produced by the energy source is greater than the power consumed by the electrical output,

the power source is connected to the battery for powering it, if the power produced by the energy source is greater than the power exchanged with the battery, or

the energy source is connected to the electrical network;

- d) transmission to a monitoring device of the electrical production and consumption information and the possibility of controlling several remote systems.

e) the electrical output is connected to the power source, the battery or the electrical network according to hourly charging information of the kWh supplied by the public electricity network, such as full time or off-peak time, in which the electrical output is connected:

- to the power source, then to the battery if the power produced by the electrical source is less than the power consumed by the electrical output, then to the electricity network if the measurand of the state of charge of the battery of the step a) expressed as a percentage is less than the predetermined limit value, if the information of the hourly rate of kWh provided by the public electricity network is high,

- to the energy source, then to the electrical network if the power produced by the electrical source is less than the power consumed by the electrical output if the information of the hourly rate of kWh provided by the public electricity network is low, then the battery, if there is a power failure.

The term "electrical outlet" refers to an element that consumes electricity, for example a bulb, a domestic hot water tank, etc.

The term "electricity network" refers to a public network of which a set of more or less available energy infrastructures makes it possible to convey the electrical energy from the production centers to the electricity consumers.

The term high and low refers to the price of electricity from the electricity grid, for example in France, EDF (registered trademark) offers two hourly rates according to the time of day: full hour pricing and off-peak pricing . Thus, in this example, the term "high" corresponds to "full hour" and the term "low" corresponds to "off-peak".

The high pricing information is 15.93 euro cents per KWh, (full hour). The low pricing information is 10, 48 eurocents per KWh (full hour).

Thus, in this embodiment, the method controls the load as a function of the pricing information. For example, the charge control of the heating of the hot water tank is only performed during a low tariff.

Thanks to these provisions, the method allows the optimization of production management according to the consumption, storage and availability of the network. The process uses and directs the energy produced intelligently for optimal performance.

Thanks to these provisions, the energy produced is directly sent to the power grid without loss of energy since there is no passage to a battery. Indeed, the state of the art shows us that in off-grid systems, the energy produced first goes into the batteries to charge them and only then the energy is used to power the outputs. This principle of the state of the art includes a loss of energy of the order of 20%. The transmission makes it possible to consult in real time the production and the electrical consumption. There is then a better interaction with the public electricity network.

Thus, the method makes it possible to control the process remotely in order to be able to change the priorities of the energy flows or to change the options on the use of energy flows at the request of the end user without the intervention of a man from job. Thus, the end customer can, for example:

- Change the charging time of the battery by the network, essential option to optimize the use of the battery depending on the season.

- Update product developments that improve product performance or increase product options

- Change the system time when changing to summer time or winter time

There is also the possibility of receiving information by the public network manager for load shedding or load control in order to make network support in terms of power and a stabilization of the voltage and frequency of the network.

There is also the possibility for the method to communicate with connected objects in order to enable or disable them to achieve load shedding or activation for the purpose of achieving network support and stabilization.

There is also the possibility of creating virtual power plants that allow the installation of many intercommunicating process units in order to increase the overall efficiency of the virtual plant as well as the efficiency of network support.

In one embodiment, when the power source is supplying the electrical output, the method also comprises the following steps:

calculating a first remaining power by subtracting the power consumed by the electrical output from the power produced by the energy source;

- connection of the first remaining power to the battery to charge said battery, if the measurand of the state of charge of the battery of step a) expressed as a percentage is less than a predetermined limit value and if the measurand of the first remaining power is greater than zero;

calculating a second remaining power by subtracting the power exchanged with the battery at the first remaining power;

- connection of the second remaining power to the power grid, if the measurand of the second remaining power is greater than zero;

- Connection of the first remaining power to the electrical network if the measurand of the state of charge of the battery of step a) expressed in percentage is greater than a predetermined limit value.

Thus, the process makes it possible to increase the total output of the production of the energy source and thus to reduce the price of the kWh consumed by directly supplying the electrical output and charging only the excess of the production of the source of energy. energy in the battery. This principle avoids yield losses due to different non-essential conversions.

In one embodiment, when the power source is powering the battery, the method also includes the following steps:

calculating a first remaining power by subtracting the power exchanged with the battery from the power produced by the energy source;

- connection of the first remaining power to the electrical output, if the first remaining power is greater than the power consumed by the electrical output,

calculating a second remaining power by subtracting the power consumed by the electrical output with the first remaining power;

- connection of the second remaining power to the power grid, if the measurand of the second remaining power is greater than zero.

Thus, the method allows countries with an unstable electricity network to ensure that they have a full battery so that they can fully use it in the event of a problem on the public electricity grid. It also makes it possible to supply the electrical output in the case where the power output of the energy source is greater than the maximum power charge or in the case of a battery that is already fully charged.

In embodiments, the method comprises a step of measuring the electrical network and if the measurand of the voltage of the electrical network is greater than zero, then the predetermined limit value is 30 to 55%, preferably 45 to 55% and when the measurand of the mains voltage is zero then the predetermined limit value is 60 to 90%, preferably 75 to 85%.

Thus, the method makes it possible to increase the life of the battery when the public electricity network is present and also to increase the autonomy of the system in the event of a problem on the public electricity network and without the intervention of a person skilled in the art.

Thanks to these provisions, the lifetime of the connected batteries is preserved and their longevity is increased. The use of two predetermined limit values (one of the order of 50% and the other of the order of 80%) makes it possible to optimize the charge / discharge cycle of the battery. Indeed, the charge / discharge cycles of the batteries are known by the supplier and a simple discharge of a few minutes uses a cycle. In order to increase the life of the battery, the discharge of a battery is allowed under certain conditions. Thus, when there is a cut of the network the batteries are discharged to a deeper threshold (of the order of 80% of the battery voltage), which avoids using a battery cycle too often and which significantly increases the life of the batteries. In the case, where the electricity network is present, the life of the batteries is preferred. This is why the discharge threshold is lower (about 50% of the battery voltage).

In embodiments, the energy source is a renewable energy, such as a solar panel, a wind turbine, a marine energy.

Thus, the process makes it possible to adapt to all the renewable energies used for the most part on the world market.

In embodiments, the method also includes the following step:

- in the case of a battery technology using a protection relay, a starter battery replaces the battery for a period of time predetermined and information is sent to the battery to open its protection relay, if the measurand of the battery voltage is greater than a predetermined limit value and if the power consumed by the electrical output is less than the power produced by the source of energy, or if the measurand of the voltage of the battery is lower than a predetermined limit value and if the power consumed by the electrical output is greater than the power produced by the energy source for a predetermined duration.

Thus, the method allows the installation of a starter battery in parallel with the main battery so that it is used in the first moments (predetermined period) of a need for charging / discharging or in case of peaks of starting. a consumer of the electrical output and therefore to increase the life of a lithium battery using power relays for protection without much variation in the cost of the system.

The vast majority of Lithium batteries use power relays to protect the battery in the event of a problem (overcurrent, overvoltage, overtemperature ...). The power relays have a lifetime expressed in number of transitions (open <→ closed). The principle is therefore to limit the number of transitions of these relays.

In the case of a battery that requires a protection relay, this step reduces the number of closing of the battery protection relay and thus increase its performance and its lifetime.

BRIEF DESCRIPTION OF THE FIGURES

Other advantages, aims and features of the present invention will emerge from the description which follows, for an explanatory and non-limiting purpose, with reference to the appended drawings, in which:

FIG. 1 is a schematic representation of the operating principle according to a particular embodiment of the method which is the subject of the present invention,

FIG. 2 represents a schematic diagram from a macroscopic point of view,

FIG. 3 represents the principle of multi-source phase coupling of energy, FIG. 4 represents a diagram explaining the yield,

FIG. 5 represents a schematic diagram of the recharging of the batteries,

FIG. 6 represents a management diagram of the peak hours and off-peak hours,

FIG. 7 represents a diagram of several systems connected by an electrical network,

- Figure 8 shows in logic diagram form, steps implemented in a particular embodiment of the method of the present invention.

DESCRIPTION OF EXAMPLES OF EMBODIMENT OF THE INVENTION

Figure 1 shows a block diagram of the invention. It represents a box with the various elements for operating the method that is the subject of an exemplary embodiment of the invention.

A power source 20 is connected to the input of the housing. In this embodiment, the energy source is one or more photovoltaic panels. The power source becomes a DC voltage generator 1 from a light source. This voltage is then regulated by a regulator MPPT 2, then raised by a DC / DC converter 3 ("Direct Current" in English terminology, direct current, in French) to be converted into an AC voltage by a DC / AC converter. 4. ("Current Current / Alternating Current" in English terminology, direct current / alternating current in French).

One of the outputs 21 is connected to a battery.

In this embodiment, there are several batteries. The batteries are recharged from the DC voltage generated by the photovoltaic panels with a reversible DC / DC converter 7 when the electrical output 23 does not consume. The measurement of the voltage or the current of the electrical output makes it possible to know whether it consumes or not. For example, a hot water tank operates alternately in operation and non-operation.

In an exemplary embodiment, the DC / AC converter 4 is also powered from the batteries via this same DC / DC converter 7 when photovoltaic panels no longer produce enough energy.

The relays 5 and 8 are activated by the control card 11, which intelligently decides whether the energy produced goes directly to the electrical output 23.

In this case, the energy goes through the connector "AC OUTPUT" 10

("Alternating current output" in English terminology, alternating current output in French).

In an exemplary embodiment, the energy source 20 is used to recharge the batteries when they are empty. In another embodiment, the power source 20 is used to be injected into the power grid 22 by the connector "Grid connection" 6 ("Grid connection" in English terminology, connection to the network in French).

The electrical output 23 uses primarily energy from production, then that which is stored in the batteries and finally that of the electrical network 22.

In an exemplary embodiment, the batteries are recharged with the rest of the production that is not consumed by the electrical outlet 23 or the electrical network 22 according to the time slot. It will be chosen between full hour or hollow to load or not the batteries.

The intelligent switch 9 supplies a higher load by coupling the energy produced by the power source 20 and the power supply 22 when necessary.

Still in FIG. 1, a control card 1 1 drives all the converters and measures the voltages at different points of the system. The measurements are shown in the figure with dashed arrows. For example, the measurements make it possible to know the value of the voltage or the current at the electrical output, the battery or the electrical source.

The smart slot 12 ("intelligent slot" in English terminology, smart location in French) and the RS232 / USB 13 card ("RS232 / USB" for Serial Port 232 / Universal Serial Bus in English terminology, serial port 232 / universal bus in series in French) are in relationship with monitoring 15 ("monitoring" in English terminology, an electronic monitoring system in French).

The LCD 14 ("LCD" for Liquid Cristal Display in English terminology, LCD screen) present on the front of the housing gives the visual information of the system in real time to the owner of the installation, for example : the voltage and current consumed by the electrical output or produced by the power source or the power grid.

The measurement of electricity production and power consumption is in real time.

The term "real-time" refers to the fact that the measurement of electricity production or consumption is transmitted or collected by means of processing without waiting for the end of a measurement production.

Figure 2 represents a schematic diagram from a macroscopic point of view to present the different possible cases between the input and the outputs.

The method performs different combinations depending on the energy production (energy source 20), the battery charge 21 and the power consumption of the electrical output 23.

For example, here are realizations of priority choice of use of the production of the source of energy, like solar panels:

- The production of photovoltaic panels is used primarily for the power supply of the electrical output 23, then to charge the batteries 21 and the excess is injected to the power grid 22; - The production of photovoltaic panels is used primarily to charge the batteries 21, then for the supply of the output 23 and the excess is injected to the power grid 22;

- The production of photovoltaic panels is used primarily to charge the batteries 21, then to inject to the power network 22 and in the absence of power network 22, for the power supply of the electrical output 23;

the production of the photovoltaic panels is used primarily for the supply of the electrical output 23, then to charge the batteries 21. In this case, there is no injection towards the electrical network 22;

- The production of photovoltaic panels is used primarily to charge the batteries 21, then for the power supply of the electrical output 23. In this case, there is no injection to the power grid 22;

the production of the photovoltaic panels is totally injected towards the electricity network 22.

Here are other examples of realization of the priority choice of use of the electrical consumption starting from the production of energy (source of energy 20, like solar panels), batteries 21 or of the electrical network 22:

the consumption at the electrical output 23 is supplied with priority by the production of the photovoltaic panels, then by the batteries 21 if the production is insufficient, then by the electrical network 22 if the batteries 21 are discharged;

the consumption at the electrical output 23 is supplied with priority by the production of the photovoltaic panels, then by the electric network 22 if the production is insufficient, then by the batteries 21 if the electrical network 22 is not available.

the consumption at the electrical output 23 is supplied with priority by the production of the photovoltaic panels, then:

If the electricity network 22 is full hour: by the batteries 21 if the production is insufficient, then by the mains 22 if the batteries 21 are discharged.

• if the power network 22 is off-peak: by the power grid 22 if the production is insufficient, then by the batteries 21 if the power network 22 is not available.

the consumption at the electrical output 23 is not powered if it is a total injection towards the electrical network 22.

Figure 3 shows the coupling in multi-source energy phase, also called PCE ("PCE" for Phase Coupling Energy in English terminology energy phase coupling in French). Coupling allows coupling several energy sources, for example to couple the energy source 20, the batteries 21 and the electrical network 22.

The ECP provides stability to the enclosure to ensure consistent power and optimal performance.

When the electrical output consumption 23 is greater than the production of the energy source 20, such as for example photovoltaic panels, and the batteries 21 are not sufficient to satisfy the need after passing through the DC / AC converter (4) , the system adds the output current of the DC / AC converter 4 with the current of the electrical network 22 because they are in phase.

When the electrical output consumption 23 is lower than the output of the energy source 20, such as for example photovoltaic panels, and the batteries 21 are fully charged, after passing through the DC / AC converter 4, the system supplies power to the power supply. electrical output 23 from the photovoltaic current passed by the DC / AC converter 4. The surplus current is then reinjected to the electrical network 22 because they are in phase.

The multi-source coupling also allows the system to accept at output twice its nominal power at constant withdrawal:

when the electrical output consumption 23 is less than 3kW, it is powered by the photovoltaic panels and / or the batteries 21 according to the chosen priorities. If the photovoltaic panels and the batteries 21 are not enough, the electrical network 22 takes over according to the chosen priorities;

when the electrical output consumption 23 is greater than 3kW, it is powered by the photovoltaic panels and / or the batteries 21 according to the priorities chosen at the rate of 3kW maximum. If the photovoltaic panels and the batteries 21 are not enough, the electrical network 22 takes over according to the chosen priorities. Additional needs, above 3kW, will be supplied by the power grid 22. The multi-source coupling manages to manage and continues to function normally in the event of a fault, of absence, on one of the sources. Thus, when the photovoltaic panels or the batteries 21 or the mains 23 is disconnected for any reason (exceeding the authorized thresholds, external problem ...), the multi-source coupling still supplies the electrical output by compensating with available sources.

Here are examples of particular realization as a function of time when the energy source comes from solar panels:

Sunny day:

The consumption of the electrical output 23 is higher than the production of the photovoltaic panels. The production feeds the electrical output 23 directly, then charges the batteries 21, then, when the batteries are fully charged, reinjects the surplus to the mains 22.

Day with a mixed time:

The power produced by the photovoltaic panels is insufficient to supply the consumption of the electrical output 23. The output directly supplies the electrical output 23 and the batteries 21 bring the lack of power of the electrical output 23.

Sullen Day:

The power produced by the photovoltaic panels is very low compared to the consumption of the electrical output 23. The low output directly supplies the electrical output 23, the batteries 21 provide part of the lack of power of the electrical output 23 helped by the network 22 in the case where the batteries 21 are not sufficiently charged (below the threshold of 50% for example).

Night:

The electrical output 23 is supplied by the batteries 21 assisted by the electrical network 22 in the case where the batteries 21 are not sufficiently charged (below the threshold of 50% for example).

Absence of the network:

The electrical network 22 is absent. The output directly supplies the electrical output 23 and the batteries 21 bring the lack of power from the electrical output 23 to a deep discharge (80% for example). Forced charging of batteries:

During the time slot programmed to carry out a forced charging of the batteries 21, the electrical network 22 charges the batteries 21 and at the same time supplies the electric output 23.

Figure 4 shows a block diagram of battery charging.

Indeed, intelligent management of energy storage limits the use of batteries 21. The system charges the batteries 21 only with the surplus output of the power source 20, and discharges them only to provide the necessary complement to the electrical output 23.

This exemplary embodiment makes it possible to reduce the storage capacity, to extend its service life by avoiding as much as possible of soliciting it (number of reduced cycles) and to increase the overall efficiency of the system:

when the consumption at the electrical output 23 is lower than the production of the photovoltaic panels, the production passes directly to the electrical output 23 without passing through the batteries 21. Surplus production is only used to recharge batteries 21;

when the consumption at the electrical output 23 is greater than the production of the photovoltaic panels, the production passes directly to the electrical output 23 without passing through the batteries 21 and the additional need comes from the batteries 21.

In an exemplary embodiment, the yield of the photovoltaic production transiting directly to the electrical output 23 is, at the point of maximum power, 94.5%. .

In an exemplary embodiment, the output of the photovoltaic production transiting directly to the power grid 22 is, at the point of maximum power, 94.5%.

Thus in the two preceding exemplary embodiments, for 1000W produced on the energy source 20, 945W are restored respectively on the electrical output 23 or the electrical network 22.

The efficiency of the DC / DC conversion 7 going from the photovoltaic panels to the batteries 21 is, at the point of maximum power, 94%. The efficiency of the DC / AC 4 conversion from the batteries 21 to the electrical output is 93%.

Assuming that the efficiency of the batteries 21 is 80%, average efficiency for a lead / acid battery (variable depending on model and technology, up to 95% for Lithium batteries), the efficiency the photovoltaic production passing through the batteries 21 to supply the electrical output 23 is 69.9% (0.94 x 0.93 x 0.80 = 0.699).

The overall efficiency of the installation, taking into account that 50% of the production is consumed directly by the electrical output 23 and that 50% is stored in the batteries 21 is 82.2%. Thus, for 1000W produced on the energy source 20, 822W are restored on the electrical output 23.

The overall efficiency of the installation, taking into account that 70% of the production is consumed directly by the electrical output 23 and that 30% is stored in the batteries 21 is therefore 88.5%. Thus, for 1000W produced on the energy source 20, 885W are restored on the electrical output 23.

Compare to the state of the art, each of the components in series causes a loss. In a traditional system (prior art), it is placed successively the regulator (loss between 10% to 20%), batteries (loss of about 20%) and an inverter (loss between 10% to 15%), or an overall loss of 35% to 45%. Using a MPPT regulator, a charger and an inverter in one housing greatly reduces the overall loss which is reduced to 20%.

Figure 5 shows a block diagram of the battery charge.

According to an exemplary embodiment, the method comprises two levels of discharge threshold depending on the availability of the electrical network 22. This configuration significantly increases the life of the batteries 21 while giving priority to the autonomy of the system when it is useful.

The method further comprises a step of measuring the voltage and frequency of the electrical network which will allow, in addition to the monitoring aspect (for monitoring in French), to check the presence or absence of the public network. When the electrical network 22 is present, a correct depth of discharge for the batteries is applied in order to favor the life of the batteries 21, for example, 50% of the charge of the battery for the lead / acid batteries.

When there is a power failure 22, it is automatically applied a greater depth of discharge (eg 80% of the battery charge) to give priority to the autonomy of the system.

In the figure, phase 30 shows the charge of the battery. The discharge phase 31 shows the discharge phase of the battery if the electric network 23 is available. The discharge phase 32 shows the discharge phase of the battery if the electrical network 22 is not available.

In an exemplary embodiment, the method comprises a step of transmitting production and consumption information measurements.

In an exemplary embodiment, the transmission is wireless for sending information on production or consumption measurements to a monitoring device. The remote connection is possible via the internet or telecommunications networks. For example, when the monitoring device is a mobile phone, the transmission is an SMS (Short Message Service or SMS in English terminology, or messaging service in French) which gives the production and consumption. In another example, information on the system is transmitted to be collected and compared to a history of electricity consumption and production.

In another embodiment, the transmission is wired (USB / RS232) to transmit information to the monitoring device.

For example, the monitoring device is a computer, mobile phone, tablet, or any device for reading information as a screen ...

In another exemplary embodiment, the monitoring device makes it possible to control the charge of the batteries.

FIG. 6 represents a diagram integrating information on the full hour and the off-peak time of an electric meter. The system comprises a housing 40 comprising a microcontroller 41 and a management card 42 for controlling electrical outlets 48. The management card makes it possible to integrate information. For example, the information sent to the management card is: a request for load shedding, hourly charging of the public electricity network. The management card makes it possible to control the power supply of the electrical outlets 48 according to this schedule.

The method takes into account the schedule to use different strategies:

- When the public electricity network sends a low hourly rate information the system authorizes the forced charging of the batteries from the public electricity network;

- When the public electricity network sends out load shedding information, the system allows to reduce the consumption from the public electricity network by offsetting a part of the output consumption.

- When the production is significantly higher than the consumption, the system allows activating loads by piloting (water heater / heating / refrigerator / dishwasher ...) A transmission of the information of the piloting is transmitted to a device monitoring 47 in which it is displayed data on the power of electrical outlets, such as electrical outlets supplying the water heater, heating, refrigerator, freezer, dishwasher ...

In an exemplary embodiment, the transmission is carried out wirelessly over Wi-Fi (for wireless communication protocols governed by the IEEE 802.1 1 group standards, registered trademark).

When Wi-Fi is used, it is connected to an Internet box 44 ("box internet" for internet box in French) to provide access to the Internet 48. In this way, the monitoring device 47 receives the information via Wi-Fi or the telecommunication network to display information by connecting to the internet.

In an exemplary embodiment, the transmission is performed wirelessly by ZigBee link (for high-level protocol for communication small radios, low consumption, based on the IEEE 802.15.4 standard for networks with a personal dimension, trademark).

In another embodiment, the electrical outlets 48 are remotely controlled by home networks, such as ZigBee and Wi-Fi.

Figure 7 shows a diagram with several systems connected by a public network.

When several systems are paralleled on their electrical network output 22, an interaction is made between each of them. There is the possibility of stabilizing in voltage and frequency the electrical network 22 on command and by communication between the systems. When one of the systems has a lack of battery 21 due to a strong demand for electric output power 23, another system with a low electrical output requirement 23 sends its electrical output 20 to the electrical network outlet 22 so that the first system recovers this electrical production instead of consuming the power of the electrical network 22 (the current physically taking the shortest path, it will be primarily from the production close to the power grid 22). The greater the number of systems installed in parallel on site, the more stable the public electricity network.

According to an exemplary embodiment, there are several casings connected in parallel.

When the public network voltage is low, a command allows all the systems to inject the power of the battery 21 and / or the power source (20) onto the electrical network output 22 or by offloading the loads in order to raise the voltage of the public electricity network up to its nominal value.

When the public network voltage is high, a command allows all the systems to activate loads and / or to draw the power of the public electricity network to charge the battery 21 in order to lower the voltage of the public network electricity up to its nominal value.

When the public network frequency is high, a command allows all the systems to consume an active power from the public electricity network to charge the battery 21 in order to lower the frequency of the public electricity network until its nominal value. High is understood to be the frequency of up to 1% above its nominal value.

When the frequency of the public network is low, a command allows all the systems to inject an active power on the public electricity network from the battery 21 in order to raise the frequency of the public electricity network until its nominal value.

Low is understood to be the frequency of up to 3% below its nominal value.

Figure 8 shows the steps of the method object of the present invention. It comprises :

a step 50 of measuring the voltage and the current of the energy source, the electrical output and the battery,

a step 51 of calculating the power of the energy source, the electrical output and the battery,

a step 52 connection between the power source, the electrical output, the battery or the electrical network.

According to an exemplary embodiment, when the battery 21 is of technology requiring a protection relay consuming energy at rest (example Lithium battery: battery releases electricity by reversible exchange of lithium ions between two electrodes: a graphite anode and a metal oxide cathode) and that the measurand of the voltage of the electrical source 20 is zero, a starter battery is connected in parallel with the battery 21 of lithium technology to reduce the closing time of a protective relay of the battery 21 and thus to increase its efficiency.

Protection relay means one or more relays integrated into the lithium batteries on the market to secure the battery (open: non-functional battery, closed: functional battery). This relay consumes energy; optimize its use will help to improve performance.

Example 1

When the measurand of the voltage of the battery 21 is greater than a predetermined limit value, a command is sent to the battery 21 in order to open its protection relay: if the measurement of the voltage of the battery 21 is above the threshold of a charged battery (58V for example) information is sent to the battery 21 to open its relay protection.

Example 2

If a power is requested at the electrical output 23 and the power of the energy source 22 is lower, the starter battery is requested for a predetermined duration: if a power is requested at the electrical output 23 and the power of the source energy 22 is lower, the starter battery is requested for example for 30 seconds.

Example 3

If the electric output power 23 remains greater than the power of the power source 22 during this predetermined time, a command is sent to the battery 21 in order to close the protection relay of the battery 21: if the electrical output power 23 remains greater than the power of the electric source 22 for for example 30 seconds, a command is sent to the battery 21 to close the battery protection relay 21.

Example 4

When the measurand of the voltage of the battery 21 is lower than a predetermined limit value, a command is sent to the battery 21 in order to open its protection relay: when the measurand of the voltage of the battery 21 is below the threshold of end of use of a battery (42V for example), a command is sent to the battery 21 to open its relay protection.

Example 5

If a power is requested at the electrical output 23 and the measurand of the voltage of the starter battery is greater than a predetermined limit value and the power of the energy source 22 added to a predetermined limit value is greater for a duration predetermined, a command is sent to the battery 21 to close the battery protection relay 21: if a power is requested electrical output 23 (1000W) and the measurand of the voltage of the starter battery is greater than the predetermined limit value of a charged battery (58V for example: the battery is charged) and that the power of the energy source 22 (1200W) added to an offset of -50W (1 150W) is greater than the power of the output 23 (1000W) for 15 seconds, a command is sent to the battery 21 in order to close the protection relay of the battery 21 (allowing the charging of the battery 21).

According to another exemplary embodiment, the present invention aims at a system for implementing the method, said system comprises a housing comprising:

a device for tracking the point of maximum power,

an energy phase coupling device,

- a charger, and

- an inverter.

Thus, the housing is simple to install and reduces cabling and programming. Overall losses are greatly reduced by having everything integrated in one box.

The tracking device of the maximum power point, also called MPPT ("Maximum Power Point Tracking") controller is a principle allowing to follow, as its name suggests, the maximum power point of a generator non-linear electric.

In another embodiment, the system comprises a plurality of boxes.

Thus, the nearby boxes recover the electricity production instead of consuming the power of the power grid. Indeed, the current physically taking the shortest path, it will be primarily from the neighboring production of the electricity network.

NOMENCLATURE

I voltage generator 30 charging phase

continuous 31 phase of discharge with

5 2 MPPT regulator electrical network

3 DC / DC converter 30 32 discharge phase without

4 DC / AC power converter

5 relays

6 connector «Grid 40 housing

10 connection »41 microcontroller

7 DC / DC Converter 35 42 Management Card

reversible 43 full time information

8 relays or off-peak

9 smart switch 44 internet box

15 1 0 AC OUTPUT connector 45 WIFI connection

I I order card 40 46 internet

1 2 intelligent slot 47 monitoring device

1 3 RS232 / USB card 48 electrical outlets

14 LCD screen

20 1 5 monitoring 50 step measuring the

45 electrical production

51 stream connection step

20 source of electrical energy

52 step of connecting the

21 battery

electrical outlet

22 electrical network

25 23 electrical outlet

Claims

1. Energy management method, characterized in that it comprises the following steps:

- a) measuring the voltage and current of a power source (20), an electrical output (23) and a battery (21);

b) calculating the power produced by the energy source (20), the power consumed by the electrical output (23) and the power exchanged with the battery (21);

- c) connection between the power source (20), the electrical output (23), the battery (21) and an electrical network (22):

the power source (20) is connected to the electrical output (23) for powering it, if the power produced by the energy source (20) is greater than the power consumed by the electrical output (23),

the power source (20) is connected to the battery (21) for powering it, if the power produced by the energy source (20) is greater than the power exchanged with the battery (21), or

the energy source (20) is connected to the electrical network (22);

e) the electrical output (23) is connected to the power source (20), the battery (21) or to the electrical network (22) according to hourly charging information of the kWh supplied by the public network; electricity, such as full hour or off-hour, in which the electrical output (23) is connected:

- to the energy source (20), then to the battery (21) if the power produced by the electrical source (20) is less than the power consumed by the electrical output (23), then to the electrical network (22). ) if the measurand of the state of charge of the battery (21) of step a) expressed as a percentage (%) is less than the predetermined limit value, if the information of the hourly kWh rate provided by the public electricity grid is high.

- to the energy source (20), then to the electrical network (22) if the power produced by the electrical source (20) is less than the power consumed by the electrical output (23) if the pricing information kWh time provided by the public electricity network is low, then to the battery (21), if there is a power cut (22).

The method of claim 1, wherein when the power source (20) powers the electrical output (23), the method also comprises the following steps:

calculating a first remaining power by subtracting the power consumed by the electrical output (23) from the power produced by the energy source (20);

- connection of the first remaining power to the battery (21) to charge said battery (21), if the measurand of the state of charge of the battery (21) of step a) expressed as a percentage (%) is lower at a predetermined limit value and if the measurand of the first remaining power is greater than zero;

calculating a second remaining power by subtracting the power exchanged with the battery (21) at the first remaining power;

- connection of the second remaining power to the power grid (22), if the measurand of the second remaining power is greater than zero;

- Connecting the first remaining power to the power grid (22) if the measurand of the state of charge of the battery (21) of step a) expressed as a percentage (%) is greater than a predetermined limit value.

The method of claim 1, wherein when the power source (20) powers the battery (21), the method also comprises the following steps: calculating a first remaining power by subtracting the power exchanged with the battery (21) from the power produced by the energy source (20);

- connection of the first remaining power to the electrical output (23), if the first remaining power is greater than the power consumed by the electrical output (23),

calculating a second remaining power by subtracting the power consumed by the electrical output (23) with the first remaining power;

- Connecting the second remaining power to the power grid (22), if the measurand of the second remaining power is greater than zero.

4. Method according to one of claims 2 to 3, wherein it comprises a measuring step of the electrical network (22) and if the measurand of the voltage of the electrical network (22) is greater than zero, then the predetermined limit value is 30 to 55%, preferably 45 to 55% and when the measurand of the mains voltage (22) is zero then the predetermined limit value is 60 to 90%, preferably 75 to 85%.

5. The method of claim 1, wherein the energy source (20) is a renewable energy, such as a solar panel, a wind turbine, a marine energy.

6. Method according to one of claims 1 to 5, wherein said method also comprises the following step:

- in the case of a battery (21) of technology using a protection relay, a starter battery replaces the battery (21) for a predetermined time and information is sent to the battery (21) to open its protection relay if the measurand of the battery voltage (21) is greater than a predetermined limit value and the power consumed by the electrical output (23) is less than the power produced by the power source (22), or if the measurand of the voltage of the battery (21) is lower than a predetermined limit value and if the power consumed by the electrical output (23) is greater than the power produced by the energy source (22) for a predetermined time.