CN113315159A - Energy optimization device applied to single-phase photovoltaic grid-connected power generation - Google Patents

Energy optimization device applied to single-phase photovoltaic grid-connected power generation Download PDF

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Publication number
CN113315159A
CN113315159A CN202110709749.3A CN202110709749A CN113315159A CN 113315159 A CN113315159 A CN 113315159A CN 202110709749 A CN202110709749 A CN 202110709749A CN 113315159 A CN113315159 A CN 113315159A
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China
Prior art keywords
phase
optimization device
energy
energy optimization
power generation
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CN202110709749.3A
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Chinese (zh)
Inventor
裴兴福
魏明锋
王旋旋
时东朝
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Shandong Zhonghao Intelligent Electric Co ltd
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Shandong Zhonghao Intelligent Electric Co ltd
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Priority to CN202110709749.3A priority Critical patent/CN113315159A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Photovoltaic Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an energy optimization device applied to single-phase photovoltaic grid-connected power generation, which comprises a transformer, an energy optimization device, a switch metering box, an energy storage system and a photovoltaic module, wherein the transformer is electrically connected with the energy optimization device through a three-phase cable and a zero line, the energy optimization device is electrically connected with the switch metering box through a live wire and a zero line, the switch metering box is electrically connected with the energy storage system through a live wire and a zero line, and the energy storage system is electrically connected with the photovoltaic module through a live wire and a zero line. The invention has the advantages that the three-phase power load is collected, the self data is collected through the internal mutual inductor according to the size of the power load, the logical judgment is carried out through the optimizing device controller, the phase sequence of the photovoltaic power generation reverse power transmission is selected, and the root carbon emission is fundamentally reduced.

Description

Energy optimization device applied to single-phase photovoltaic grid-connected power generation
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to an energy optimization device applied to single-phase photovoltaic grid-connected power generation.
Background
According to technical parameters and requirements of GB/T6451 oil-immersed power transformer, the loss of the oil-immersed power transformer is generally 1% -3% of the capacity of the transformer, meanwhile, the active loss and the reactive loss of a cable are considered, namely conductors of GB/T-3956 and 2008 cables, three-phase current imbalance caused by photovoltaic reverse power transmission and energy waste caused by N-line current are considered, and an energy optimization device for single-phase photovoltaic grid connection is at the forefront.
The photovoltaic power generation is single-phase electricity and can only be connected to one phase of the power grid A \ B \ C in parallel, the load of the transformer area is variable, and the condition that the single-phase load current at the outlet side of the transformer is negative or extremely low often occurs after a single-phase photovoltaic module is added to the transformer area. The occurrence of the situation means that the generated energy of the photovoltaic system is not fully applied (or maximally applied) in the platform area, but is transmitted to a 10KV high-voltage power grid in a reverse power transmission mode. Because the transport of transformer and long distance circuit can cause very big degree energy extravagant, at present, photovoltaic energy storage equipment all utilizes the change of battery controller according to sunshine intensity and load, controls storage battery's charge-discharge. At present, photovoltaic energy storage equipment is influenced by a storage battery, is expensive and has a short service life.
Disclosure of Invention
The invention aims to provide an energy optimization device applied to single-phase photovoltaic grid-connected power generation, which has the advantages of collecting three-phase power load, collecting self data through an internal mutual inductor according to the size of the power load, carrying out logic judgment through an optimization device controller, and selecting the phase sequence of photovoltaic power generation reverse power transmission, thereby fundamentally reducing the emission of root-cause carbon, solving the problems that the photovoltaic power generation is single-phase power and can only be connected in parallel with one phase of the power grid A \ B \ C, the load of a transformer area is variable, and the condition that the single-phase load current at the outlet side of a transformer is negative or extremely low frequently occurs after a single-phase photovoltaic module is added in the transformer area. The occurrence of the situation means that the generated energy of the photovoltaic system is not fully applied (or maximally applied) in the platform area, but is transmitted to a 10KV high-voltage power grid in a reverse power transmission mode. Because the transport of transformer and long distance circuit can cause very big degree energy extravagant, at present, photovoltaic energy storage equipment all utilizes the change of battery controller according to sunshine intensity and load, controls storage battery's charge-discharge. The photovoltaic energy storage equipment is influenced by the storage battery at the present stage, and the photovoltaic energy storage equipment is high in price and short in service life.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an energy optimization device for single-phase photovoltaic grid-connected power generation, includes the transformer, the energy is optimized the device, the switch batch meter, energy storage system and photovoltaic module, and the transformer passes through three-phase cable and zero line and energy optimization device electric connection, and the energy is optimized the device and is passed through live wire and zero line and switch batch meter electric connection, and the switch batch meter passes through live wire and zero line and energy storage system electric connection, and energy storage system passes through live wire and zero line and photovoltaic module electric connection.
Preferably, the energy storage system comprises an energy storage part and a single-phase inverter, and the energy storage part and the single-phase inverter are respectively electrically connected with the load through conducting wires.
Preferably, the switch batch meter is electrically connected with the load through a lead.
Preferably, the two sides of the energy optimization device on the three-phase cable are provided with a plurality of loads, and the loads are electrically connected with the three-phase cable through cables respectively.
Preferably, the photovoltaic module is installed at the tail end of the line, the external sampling transformer can be installed on the side of the transformer or in front of the grid-connected point, and when the photovoltaic module is installed in the middle section of the line, the external sampling transformer can be installed behind the grid-connected point.
Preferably, a thyristor, a permanent magnet relay, a permanent magnet switch and a quick non-sensing execution element are arranged in the energy optimization device.
Compared with the prior art, the invention has the beneficial effects that: the photovoltaic power generation is single-phase electricity and can be fixed on one phase of the power grid A \ B \ C; by means of an external A \ B \ C three-phase current transformer, the three-phase current transformer is generally installed nearby behind a photovoltaic grid-connected point, an optimal phase sequence is selected by utilizing a difference value comparison method of the internal transformer and the external transformer, three-phase power load is collected, self data are collected through the internal transformer according to the size of the power load, logic judgment is conducted through an optimizing device controller, the phase sequence of photovoltaic power generation reverse power transmission is selected, for example, photovoltaic power generation equipment transmits power to the A phase, when the C phase load current is detected to be maximum (namely the power demand is maximum), photovoltaic power generation equipment is connected to the C phase, the power generated by photovoltaic is enabled to obtain the maximum utilization rate nearby, resource waste caused by line transmission and self loss of a transformer is reduced, and free conversion can be conducted in the A \ B \ C phase according to load change of each phase of a transformer area (mainly load change behind an access point), the electricity generated by the photovoltaic is better digested in the transformer area, the loss of electric energy in the power grid is reduced, and the emission of root-cause carbon is fundamentally reduced.
Drawings
Fig. 1 is a schematic front view of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a technical scheme of an energy optimization device applied to single-phase photovoltaic grid-connected power generation
An energy optimization device applied to single-phase photovoltaic grid-connected power generation comprises a transformer, an energy optimization device, a switch metering box, an energy storage system and a photovoltaic assembly, wherein the transformer is electrically connected with the energy optimization device through a three-phase cable and a zero line, an optimal phase sequence is selected by utilizing a difference comparison method of an internal mutual inductor and an external mutual inductor, three-phase power load is collected, self data is collected through the internal mutual inductor according to the size of the power load, logic judgment is carried out through an optimization device controller, the phase sequence of photovoltaic power generation reverse power transmission is selected, for example, photovoltaic power generation equipment transmits power to an A phase, when the maximum current of a C phase load (namely the maximum power demand is detected), photovoltaic power generation equipment is connected to the C phase, the maximum utilization rate of the power generated by photovoltaic is obtained nearby, and the resource waste caused by line transmission and the self loss of the transformer is reduced, the energy optimization device can freely convert in A \ B \ C phases according to load change of each phase of a transformer area (mainly load change after an access point), electricity generated by photovoltaic can be better digested in the transformer area, loss of electric energy in a power grid is reduced, root carbon emission is fundamentally reduced, a thyristor, a permanent magnetic relay, a permanent magnetic switch and a quick non-sensing execution element are arranged in the energy optimization device, loads are arranged on two sides of the energy optimization device on a three-phase cable, the loads are provided with a plurality of loads, the loads are electrically connected with the three-phase cable through cables respectively, and the energy optimization device is electrically connected with a switch metering box through a live wire and a zero wire.
The switch metering box passes through wire and load electric connection, the switch metering box passes through live wire and zero line and energy storage system electric connection, energy storage system includes energy storage part and single-phase dc-to-ac converter, and energy storage part and single-phase dc-to-ac converter pass through wire and load electric connection respectively, energy storage system passes through live wire and zero line and photovoltaic module electric connection, photovoltaic module installs in the circuit end, can install outside sampling mutual-inductor in transformer side or before the site of combining, install in the circuit middle section as photovoltaic module, can install outside sampling mutual-inductor after the site of combining.
The working principle is as follows:
IA、IB、ICfor photovoltaic grid-connected point end current, ILight (es)For photovoltaic generation of electric current, IOptical useFor the use of electric current at photovoltaic power generation, ISuperior food＝ILight (es)-IOptical useFor the difference of photovoltaic power generation and power consumption can the actual power transmission current of energy optimization device, when the photovoltaic access point is located the circuit middle section of low voltage electric network, when each phase sequence of access point end still has the load promptly:
Ilight (es)>IOptical useI.e. ISuperior foodThe energy optimization device is in a power transmission state, when the external maximum load phase is changed, and the current change is more than 0.1ISuperior foodAnd when keeping a period of time t (the time can be set), optimizing the action of the device;
(1)IA>IB>ICor IA>IC>IBI.e. the A phase is loaded the most, then ISuperior foodThe access point automatically selects the phase A by the controller;
(2)IB>IA>ICor IB>IC>IAI.e. the B phase load is maximum, then ISuperior foodThe access point automatically selects the phase B by the controller;
(3)IC>IA>IBor IC>IB>IAI.e. the C phase load is maximum, then ISuperior foodThe access point automatically selects the phase C by the controller;
Ilight (es)<IOptical useI.e. ISuperior foodThe energy optimization device is in a power utilization state when the external minimum load phase is changed and the current change is more than 0.1ISuperior foodAnd when keeping a period of time t (the time can be set), optimizing the action of the device;
(1)IA<IB<ICor IA<IC<IBI.e. the A phase load is minimum, then ISuperior foodThe access point automatically selects the phase A by the controller;
(2)IB<IA<ICor IB<IC<IAI.e. the load of phase B is minimum, then ISuperior foodThe access point automatically selects the phase B by the controller;
(3)IC<IA<IBor IC<IB<IAI.e. the C-phase load is minimum, then ISuperior foodThe access point automatically selects phase C by the controller.
IA、IB、ICThe current at the outlet side of the transformer (or the current at a certain distance before the photovoltaic grid connection point) of the transformer in the transformer area ILight (es)For photovoltaic generation of electric current, IOptical useFor the use of electric current at photovoltaic power generation, ISuperior food＝ILight (es)-IOptical useFor the difference between photovoltaic power generation and power utilization, namely the actual power transmission current of the energy optimization device, when the photovoltaic access point is positioned at the line end section of the low-voltage power grid, namely no load is behind the access point:
Ilight (es)>IOptical useI.e. ISuperior foodThe energy optimization device is in a power transmission state, when the external maximum load phase is changed, and the current change is more than 0.1ISuperior foodAnd when keeping a period of time t (the time can be set), optimizing the action of the device;
(1)IA>IB>ICor IA>IC>IBI.e. the A phase is loaded the most, then ISuperior foodThe access point automatically selects the phase A by the controller;
(2)IB>IA>ICor IB>IC>IAI.e. the B phase load is maximum, then ISuperior foodThe access point automatically selects the phase B by the controller;
(3)IC>IA>IBor IC>IB>IAI.e. the C phase load is maximum, then ISuperior foodThe access point automatically selects the phase C by the controller;
Ilight (es)<IOptical useI.e. ISuperior foodThe energy optimization device is in a power utilization state when the external minimum load phase is changed and the current change is more than 0.1ISuperior foodAnd when keeping a period of time t (the time can be set), optimizing the action of the device;
(1)IA<IB<ICor IA<IC<IBI.e. the A phase load is minimum, then ISuperior foodThe access point automatically selects the phase A by the controller;
(2)IB<IA<ICor IB<IC<IAI.e. the load of phase B is minimum, then ISuperior foodThe access point automatically selects the phase B by the controller;
(3)IC<IA<IBor IC<IB<IAI.e. the C-phase load is minimum, then ISuperior foodThe access point automatically selects phase C by the controller.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (6)

1. The utility model provides an energy optimization device for single-phase photovoltaic grid-connected power generation, includes transformer, energy optimization device, switch batch meter, energy storage system and photovoltaic module, its characterized in that: the transformer passes through three-phase cable and zero line and energy optimization device electric connection, and the energy is optimized the device and is passed through live wire and zero line and switch batch meter electric connection, and the switch batch meter passes through live wire and zero line and energy storage system electric connection, and energy storage system passes through live wire and zero line and photovoltaic module electric connection.
2. The energy optimization device applied to single-phase grid-connected photovoltaic power generation according to claim 1, characterized in that: the energy storage system comprises an energy storage part and a single-phase inverter, and the energy storage part and the single-phase inverter are electrically connected with a load through conducting wires respectively.
3. The energy optimization device applied to single-phase grid-connected photovoltaic power generation according to claim 1, characterized in that: the switch metering box is electrically connected with the load through a lead.
4. The energy optimization device applied to single-phase grid-connected photovoltaic power generation according to claim 1, characterized in that: the two sides of the energy optimization device on the three-phase cable are provided with loads, the loads are provided with a plurality of, and the loads are respectively electrically connected with the three-phase cable through the cables.
5. The energy optimization device applied to single-phase grid-connected photovoltaic power generation according to claim 1, characterized in that: photovoltaic module installs in the circuit end, can install outside sampling mutual-inductor in transformer side or before the grid-connected point, when photovoltaic module installs in the circuit middle section, can install outside sampling mutual-inductor in after the grid-connected point.
6. The energy optimization device applied to single-phase grid-connected photovoltaic power generation according to claim 1, characterized in that: the energy optimization device is internally provided with a thyristor, a permanent magnet relay, a permanent magnet switch and a quick non-perception execution element.
CN202110709749.3A 2021-06-25 2021-06-25 Energy optimization device applied to single-phase photovoltaic grid-connected power generation Pending CN113315159A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110709749.3A CN113315159A (en) 2021-06-25 2021-06-25 Energy optimization device applied to single-phase photovoltaic grid-connected power generation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110709749.3A CN113315159A (en) 2021-06-25 2021-06-25 Energy optimization device applied to single-phase photovoltaic grid-connected power generation

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CN113315159A true CN113315159A (en) 2021-08-27

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