ITTV20110049A1 - SYSTEM AND EQUIPMENT FOR MANAGEMENT AND PROGRAMMING OF ELECTRICITY EXCHANGE PRODUCED BY GENERATION PLANTS FROM RENEWABLE SOURCES CONNECTED TO AN ELECTRIC DISTRIBUTION NETWORK - Google Patents

Description

MANAGEMENT SYSTEM AND EQUIPMENT E

ELECTRICITY EXCHANGE PROGRAMMING

PRODUCED BY SOURCE GENERATION PLANTS

RENEWABLES CONNECTED TO AN ELECTRICITY NETWORK OF

DISTRIBUTION

[0001] The present invention relates to a system and an equipment for managing and programming the exchange of electricity produced by generation plants from renewable sources connected to an electrical distribution network.

Field of application

[0002] Currently the connection, in our country, to the public network of Category I and II, Low Voltage and Medium Voltage, of plants for generating electricity from renewable sources, and in particular photovoltaic ones, takes place in parallel, at the electricity delivery point. The energy exchange regime at the delivery point can take on different administrative configurations, but technically it always works in the same way.

More in detail, the Producer's generation plant is operated, instant by instant, at the maximum possible power, in order to maximize production and the consequent economic returns on the investment, so that there are two conditions: a) if the plant is planned for "total sale", all the energy produced is fed into the public network;

b) if the plant is also passive, the part of the energy produced in excess of the needs of the Producer plant is fed into the grid.

[0003] With the significant increase in connected generation plants, there is an increasingly frequent difficulty of the public network in absorbing the energy produced to convey it to Passive Users who are those consuming only users, where the final customer, it draws electricity for its final use portion from a distribution network with third party connection obligations, does not carry out distribution activities and does not have its own production of electricity. Consequently, the areas declared critical by the Distributor are more and more numerous, manifesting the impossibility of connecting new plants.

[0004] It can therefore be understood that, in principle, the distribution system will have to be adapted by the Network Operator to the new requirements, but the times for carrying out the necessary works in Category II and third distribution systems are often very long , from a minimum of 3 years up to 5 years.

State of the art

[0005] A brief search in the patent literature allowed the identification of some prior documents, such as in particular:

DI JP220081 58701 (Nomura et al.)

D2 JP10028330 (Takada et al.)

D3 JP2005204485 (Morita et al.)

D4 JP10201 106 (Abe)

D5 JP4222421 (Tanaka et al.)

In principle, DI proposes a device solution capable of acquiring information relating to the total energy produced by a solar battery, a total energy consumption of a load, and a total electricity negotiated with a commercial system, in order to provide information. useful to select an optimal load plan among various load plans provided by a supplier / manager of the commercial system. D2 describes an interconnection system to distribute electricity, in such a way as to efficiently use the DC electricity generated by a photovoltaic energy generator. When the inverter is in a condition of interconnection or standby in a controlled voltage, an automatic circuit control operating system is provided, so that when the inverter stops due to the output voltage released by the inverter during the condition operating standby of the inverter, discriminates whether or not the cause of the output at the release of the output voltage lying in the DC energy release capacity or the discontinuous trend in the load capacity. D3 deals with an inverter device for an interconnection system. The purpose is basically that of harmoniously and accurately controlling when a generator of DC energy originating from a solar cell and the like is regenerated by an energy source system. D4 is a monitoring system for a photovoltaic energy generator. It basically serves to measure various types of electrical energy with a stable and highly reliable operation, by means of a method where the energy bought, the energy sold and the photovoltaic energy, are respectively measured by means of measuring energy in accordance with the outputs of the respective current transformers combined with the commercial AC power system. Finally, D5 is a photovoltaic generation system, designed to suppress the output fluctuation from a commercial energy supply, absorbing the fluctuation of energy generated by solar cells through a load driven by an inverter.

[0006] All this considered, it is reasonable to consider known a device-system that interacts with an inverter, to manage and control the source of DC energy production, such as that originating from a solar cell generator or photovoltaic energy of the type connected to a network commercial AC power supply.

Drawbacks

[0007] The known solutions have, in the applicant's opinion, some drawbacks. In particular, currently, for the temporary operation of electrical energy production plants in critical areas it is in certain cases possible to access the so-called self-consumption regime, i.e. the connection of the plant to the public grid, with the constraint of not entering energy in that network.

[0008] Furthermore, the solutions indicated by DI to D5 do not seem to offer effective devices or systems capable of modulating the production of electricity originating from a DC photovoltaic energy generator in terms of instantaneous power, automatically adapting to the load of the producer.

[0009] All this considered, the need for companies in the sector to identify innovative or at least improvement solutions and able to overcome at least the problems noted above is reasonable.

Summary of the finding

[001 0] These and other purposes are achieved with the present innovation according to the characteristics of the attached claims, solving the problems set forth by means of a system and an apparatus for managing and programming the exchange of electrical energy produced by generation plants from renewable sources connected to a commercial distribution electricity network, which includes a programmable device which is connected to a signal emission card applied to the bidirectional energy meter and connected for the modulation of energy production, to a power regulator of such mode that the system automatically performs at least the following operations through the said equipment:

□ counts, in a given period of time, the pulses supplied by the ES board relating to the active energy withdrawn from the network and considers them in terms of instantaneous power according to the measuring constant of the meter;

□ counts, in a given period of time, the pulses supplied by the ES board relating to the active energy fed into the grid and considers them in terms of instantaneous power according to the measuring constant of the meter;

□ if the value of the power introduced is higher than the set threshold, it provides to partialize the production of the generator;

□ if the value of the power introduced is lower than the other set threshold, it increases the production of the generator.

Aims

[001 1] In this way, through the remarkable creative contribution whose effect constitutes an immediate and not negligible technical progress, various and remarkable aims are achieved.

[001 2] A first purpose was to modulate the production of electricity in terms of instantaneous power by automatically following the load profile of the Producer, in such a way as to cover as much as possible the needs of the Producer and at the same time prevent the '' injecting energy into the grid or possibly limiting it to values agreed with the Distributor.

[001 3] A second purpose is to create and manage energy exchange methods with the public network in critical areas according to complex, variable and programmable models that simultaneously involve a virtually unlimited number of users, both passive and active, belonging to the same public distribution network.

[001 4] A further advantage of the invention is represented by the possibility of activating or alternatively deactivating the device for managing and scheduling the electricity exchange by means of a simple signal provided by the commercial distributor body on the basis of the actual operating status of the network.

[001 5] In conclusion, these advantages have the non-negligible advantage of achieving an optimized system with a high-tech equipment for managing and programming the exchange of electrical energy, so that it becomes technically possible to enter all the energy produced by the generation plant from renewable sources in the Public Grid even in areas declared to be critical and interrupt this injection automatically and only in the event of the actual impossibility of the electricity system to absorb it.

[001 6] These and other advantages will appear from the following detailed description of a preferential solution of realization with the help of the attached schematic drawings whose execution details are not to be intended as limiting but only and exclusively exemplary.

Contents of the drawings

□ Figure Ί is the flow diagram of the system with the equipment object of the present invention applied to a user connected to the public network of Category II;

□ Figure 2 is the flow chart of the single user regulation system with the equipment object of the present invention applied to a user connected to the public network of Category II;

□ Figure 3 is the flow diagram of the multi-user regulation system of the equipment object of the present invention applied to a user connected to the public network of Category II.

Practical execution of the invention

[001 7] The present innovation refers to a system for the management and programming of the exchange of electric energy, (Figs.

1 -3) produced by a renewable source generation plant (10) connected to a distribution network (20) by means of a management and programming equipment (100, 200, 300). Said equipment (100, 200, 300) includes at least one management and programming device (100) which is of the type configured for use in Category I and II public electricity distribution networks (20).

[001 8] The said system for the management and programming of the electricity exchange (Fig. 1) requires that the management and programming device (100) be interfaced with an ES signal emission card (200) and with a power regulation module (300). More specifically, for measuring the instantaneous conditions of energy exchange with the public network (20), the management and programming device (100) is connected to a special ES signal emission card (200) which is applied to the bidirectional energy meter (21) of energy withdrawn and energy introduced, and made available by the commercial distribution body. To allow the modulation of energy production, the management and programming device (100) is connected, upstream, to the power regulator (300), a power regulator of the type developed by the manufacturers of the converters.

[001 9] The system for the management and programming of the electricity exchange through the said management and programming equipment (100, 200, 300) allows the automatic execution of the following operations:

□ counts, in a determined period of time, the pulses supplied by the ES board (200) relating to the active energy withdrawn from the network (20) and considers them in terms of instantaneous power according to the measuring constant of the meter (21);

□ counts, in a determined period of time, the impulses supplied by the ES board (200) relating to the active energy fed into the grid (20) and considers them in terms of instantaneous power according to the measuring constant of the meter (21);

□ if the value of the power introduced is higher than the set threshold, it provides to partialize the production of the generator (10);

□ if the value of the power introduced is lower than the other set threshold, it increases the generation of the generator (1 0).

[0020] In order to adapt the management and programming system to multiple situations and needs, the following quantities can be programmed in the management and programming device (100):

□ duration of the analysis period of the energy flow at the connection point (30) with the public grid (20);

□ ratio between the number of pulses detected and valorisation in terms of power, adaptation to the measurement constant of the meter (21);

□ intervention threshold relating to the withdrawal power;

□ intervention threshold relating to the input power;

□ percentage of increase or reduction in generator power (1 0) for each adjustment step.

[002 1] Furthermore, it is noted that said management and programming device (100) is designed to work with different systems both for identifying the instantaneous energy flow at the delivery point (40), and in any case in any other point of a commercial electricity network (20), even for purposes other than to regulate production. In particular, it is noted that the input can be interfaced with multifunction measuring instruments, with electronic devices equipped with a power threshold output or a simple current if a greater adjustment error is accepted. As regards the regulation of the power of the generator (10), for example in the case of using multiple generators (Figs. 1 -3), it can also take place by simply disconnecting / automatically connecting one or more generators (10).

[0022] The equipment (100, 200, 300) can also be connected, by means of expansion modules and adequate network interfaces, also via WEB (400) (Fig. 3), to several delivery points (41) in places different and intervene on the regulation of the generator taking into account the flow of energy to the public network (20) in terms of instantaneous cumulative data. This system makes it possible to create and manage exchange modes with the public network (20) in critical areas according to complex, variable and programmable models that simultaneously involve a virtually unlimited number of users (50) MV / LV (medium / low voltage), both passive and active, relating to the same public distribution network (20).

[0023] A further advantage, in this case, of the management and programming device (100) is represented by the possibility of being activated / deactivated by a simple signal provided by the Distributor on the basis of the actual operating status of the Network (for example "Smart Grid"). In this way it becomes technically possible to introduce all the energy produced into the Public Grid (20) even in areas declared to be critical and to interrupt this injection automatically and only in the event of the actual impossibility of the electricity system to absorb it.

Legend

(100) management and programming device

(200) ES signal emission board

(300) power regulation module

(400) web

(10) generation plant from renewable sources

(20) distribution network

(21) bidirectional energy meter

(30) connection point

(40, 41) delivery point

(50) MV / LV users

Claims (7)

CLAIMS 1. A system for managing and scheduling the exchange of electricity produced by generation plants (10) from renewable sources connected to a commercial distribution electricity network (20), characterized by the fact that by means of management and programming means (100, 200, 300 ) automatically performs at least the following operations: □ counts, in a determined period of time, the pulses supplied relating to the active energy withdrawn from the network (20) and considers them in terms of instantaneous power according to the measuring constant of the meter (21); □ counts, in a determined period of time, the impulses supplied relating to the active energy fed into the grid (20) and considers them in terms of instantaneous power according to the measuring constant of the meter (21); □ if the value of the power introduced is higher than the set threshold, it provides to partialize the generation of the generator (1 0); □ if the value of the power introduced is lower than the other set threshold, it increases the production of the generator (1 0); in such a way as to introduce all the possible energy produced into the Public Grid (20) even in areas declared to be critical and to interrupt this injection automatically and only in the event of the actual impossibility of the electricity system to absorb it. 2. Management and programming system for the exchange of electricity produced by generation plants (10) according to claim 1, characterized by the fact that, by means of expansion modules and network interfaces, it is also connected via WEB (400), to several points delivery (41) in different places in such a way as to intervene on the regulation of the generator taking into account the flow of energy to the public network (20) in terms of instantaneous cumulative data, managing exchange modalities with the public network (20) in areas critical according to complex, variable and programmable models involving (50) MV / LV (medium / low voltage) users, both passive and active, belonging to the same public distribution network (20). 3. Management and scheduling system for the exchange of electricity produced by generation plants (10) according to claims 1 and 2, characterized by the fact that it is activated / deactivated by a signal provided by the Distributor on the basis of the actual operating status of the Network. 4. Management and scheduling equipment (100, 200, 300) for the exchange of electricity produced by generation plants (10) from renewable sources connected to a commercial distribution electricity network (20), characterized by the fact that it includes a device programmable (100) which is connected to a signal emission board (200) applied to the bidirectional energy meter (21) and connected for the modulation of energy production, to a power regulator (300) so as to perform in automatic at least the following operations: □ counts, in a determined period of time, the pulses supplied relating to the active energy withdrawn from the network (20) and considers them in terms of instantaneous power according to the measuring constant of the meter (21); □ counts, in a given period of time, the pulses supplied relating to the active energy fed into the grid (20) and considers them in terms of instantaneous power according to the measuring constant of the meter (21); a if the value of the power introduced is higher than the set threshold, it provides for partializing the generation of the generator (10); □ if the value of the power introduced is lower than the other set threshold, it increases the production of the generator (10); 5. Management and programming apparatus (100, 200, 300), according to claim 4, characterized in that in the management and programming device (100) the following quantities are programmable: □ duration of the analysis period of the energy flow at the connection point (30) with the public grid (20); □ ratio between the number of pulses detected and valorisation in terms of power, adaptation to the measuring constant of the meter (21); □ intervention threshold relating to the withdrawal power; □ intervention threshold relating to the input power; □ percentage of increase or reduction in generator power (10) for each adjustment step. 6. Management and programming equipment (100, 200, 300), according to claims 4 and 5, characterized in that it is connected, by means of expansion modules and network interfaces, also via WEB (400), to several delivery points (41) in different places and intervenes on the regulation of the generator taking into account the flow of energy to the public network (20) in terms of instantaneous cumulative data. 7. Management and programming device (100, 200, 300), according to claims 4, 5 and 6, characterized in that the management and programming device (100) is activated / deactivated by signaling provided by the Distributor on the base the actual state of operation of the "Smart Grid" network.