CN115733185A - Distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for residence - Google Patents
Distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for residence Download PDFInfo
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Abstract
The invention relates to the technical field of residential power supply, in particular to a distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for a residence. The photovoltaic power grid and the public power grid supply power to the household power grid in a grid-off and grid-connected exchange mode, an energy storage side is arranged in the photovoltaic power grid, a distribution power grid layer is formed in the grid-off and grid-connected exchange process, and the distribution power grid layer is used for weakening the effect of the energy storage side. According to the invention, the damage to the energy storage side is reduced by weakening the use of the energy storage side, the service life is prolonged, and the use cost of off-grid and grid-connected interchange is reduced; furthermore, the weakening of the use of the energy storage side also enables a reduction in energy consumption, since during the energy storage process there is a consumption of electrical energy, in particular during the conversion into thermal energy.
Description
Technical Field
The invention relates to the technical field of residential power supply, in particular to a distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for a residence.
Background
The photovoltaic power generation is based on the principle of photovoltaic effect, and solar energy is directly converted into electric energy by using a solar cell. The photovoltaic power generation system mainly comprises a solar panel (assembly), a controller and an inverter, and the photovoltaic power generation system mainly comprises electronic components but does not relate to mechanical components.
Therefore, the photovoltaic power generation equipment is extremely refined, reliable, stable, long in service life and simple and convenient to install and maintain. Theoretically, photovoltaic power generation technology can be used in any situation requiring a power supply, from the top to spacecraft to domestic power supplies.
Usually, a household power grid is connected with a public power grid, an electric meter is arranged between the household power grid and the public power grid for charging, and two concepts of off-grid and grid-connection appear after the photovoltaic power grid is introduced, wherein: the grid connection is that the grid connection is connected to a public power grid, namely a photovoltaic power grid, a household power grid and the public power grid are connected together, the grid connection is a power generation system which can only run by depending on the public power grid, and the power generation system mainly comprises a solar cell panel and an inverter, wherein the solar cell panel directly converts 220V alternating current generated by the inverter into power for household appliances, when the generated energy of solar energy exceeds the electric quantity used by the household appliances, redundant power is transmitted to the public power grid, and when the generated energy of solar energy cannot meet the use requirement of the household appliances, the redundant power is automatically supplemented from the power grid;
the off-grid power generation system independently operates without depending on a power grid and mainly comprises a solar cell panel, an energy storage battery, a charge-discharge controller, an inverter and other components, wherein electricity generated by the solar cell panel directly flows into the storage battery and is stored, when power needs to be supplied to an electric appliance, direct current in the storage battery flows through the inverter and is converted into 220V alternating current, and the process is a repeated and cyclic charge-discharge process.
Therefore, the technologies of combining the off-grid technology and the grid-connected technology have gradually become new, for example, the technologies disclosed in chinese patent publication No.: CN204928191U discloses a solar energy grid-disconnected alternating current power supply system which is technically characterized by comprising a PV plate, a combiner box, a solar energy power supply system controller, a lithium battery pack, a BMS system, an off-grid inverter, a grid-connected inverter, an alternating current load terminal and a public power grid; the PV plate is connected with the input end of a solar power supply system controller through a combiner box, the output end of the solar power supply system controller is respectively connected with the input ends of a lithium battery pack, a BMS system and a grid-connected inverter, the output ends of the lithium battery pack and the BMS system are connected with the input end of an off-grid inverter, the output ends of the off-grid inverter and the grid-connected inverter are respectively connected with an alternating current load and the input end of a public power grid, and the output end of the public power grid is connected with an alternating current load terminal. Therefore, the solar off-grid inversion power supply system and the solar grid-connected inversion power supply system are integrated for use, so that the off-grid and grid-connected power can be flexibly distributed.
However, for a household photovoltaic power grid, the output electric quantity is not stable, which depends on the influence of weather, and for thunderstorm weather, not only public power grids are influenced, but also the photovoltaic power grid is influenced, so that the combination of off-grid and grid-connection simply cannot effectively utilize the electric energy, and the power consumption requirements of each load are different.
In view of this, it is urgently needed to provide a distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for a house.
Disclosure of Invention
The invention aims to provide a distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for a house, and aims to solve the problem of how to supply power by adopting a distributed power grid layer and a power supply mode in the background technology.
In order to achieve the purpose, the distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for the house comprises a photovoltaic power grid, a household power grid and a public power grid, wherein the photovoltaic power grid and the public power grid supply power to the household power grid in an off-grid and grid-connected exchange mode, an energy storage side is arranged in the photovoltaic power grid, a distributed power grid layer is formed in the off-grid and grid-connected exchange process, and the distributed power grid layer is used for weakening the effect of the energy storage side.
The three-level distribution power grid layer is formed in the process of grid-off and grid-connected exchange, and specifically comprises a first-level photovoltaic power grid layer, a second-level common power grid layer and a third-level energy storage power grid layer, wherein:
the primary photovoltaic grid layer mainly comprises photovoltaic power supply and secondarily comprises public power supply;
the secondary common power grid layer mainly uses common power supply and uses photovoltaic power supply as auxiliary power supply;
the three-level energy storage power grid layer only completes power supply by energy storage at the energy storage side, and power supply objects of the first-level photovoltaic power grid layer, the second-level common power grid layer and the three-level energy storage power grid layer are all household power grids.
Compared with the prior art, the invention has the beneficial effects that:
1. in the distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for the residence, the damage to the energy storage side is reduced by weakening the use of the energy storage side, the service life is prolonged, and the use cost of off-grid and grid-connected interchange is reduced; furthermore, the weakening of the use of the energy storage side also enables a reduction in energy consumption, since during the energy storage process there is a consumption of electrical energy, in particular during the conversion into thermal energy.
2. In the distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for the house, the power field effect transistors adopt insulated gate bipolar transistors to form a full-bridge inversion circuit, further, the phase difference between the power field effect transistors Q1 and Q2 is 180 degrees, and the value of the output alternating voltage changes along with the output change of the power field effect transistors Q1 and Q2; the power field effect transistors Q3 and Q4 are conducted at the same time to form a follow current loop, so that the waveform of the voltage U output by the inverting output side is not influenced by the inductive load, and the problems of poor capacity with the inductive load and low efficiency of the transformer are solved.
3. In the distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for the residence, the distribution module receives electric energy input by a power supply side and forms a distribution line connected with a load end, the port of the distribution module connected with a public power grid is provided with the tuner, and single tuner can complete electric energy allocation in two stages by using the tuner and the public power grid, so that both the electric energy and the tuner can be utilized to the maximum.
4. In this distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for house, the energy storage module need not to charge in real time, and it is as long as keep at half electric state, carries out passive charging when being less than half electric state, can protect energy storage module like this, can initiatively charge according to the power consumption demand when still being equipped with power.
Drawings
FIG. 1 is a schematic block diagram of the photovoltaic grid, home grid and utility grid connection principles of the present invention;
FIG. 2 is a schematic block diagram of the internal circuitry of the photovoltaic inverter of the present invention;
FIG. 3 is a schematic diagram of the operation of the inverter circuit according to the present invention;
FIG. 4 is a schematic block diagram of the internal modules of the home power grid of the present invention;
fig. 5 is a schematic block diagram of a feedback path between the energy storage module and the distribution module according to 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Usually, a household power grid is connected with a public power grid, an electric meter is arranged between the household power grid and the public power grid for charging, and two concepts of off-grid and grid-connection appear after a photovoltaic power grid is introduced, wherein: the grid connection is that the grid connection is connected to a public power grid, namely a photovoltaic power grid, a household power grid and the public power grid are connected together, the grid connection is a power generation system which can only run by depending on the public power grid and mainly comprises a solar cell panel and an inverter, the solar cell panel directly converts 220V alternating current generated by the inverter into power for household appliances, when the generated energy of solar energy exceeds the electric quantity used by the household appliances, redundant power is transmitted to the public power grid, and when the generated energy of solar energy cannot meet the use requirement of the household appliances, the redundant power is automatically supplemented from the power grid;
the off-grid power generation system independently operates without depending on a power grid and mainly comprises a solar cell panel, an energy storage battery, a charge-discharge controller, an inverter and other components, wherein electricity generated by the solar cell panel directly flows into the storage battery and is stored, when power needs to be supplied to an electric appliance, direct current in the storage battery flows through the inverter and is converted into 220V alternating current, and the process is a repeated and cyclic charge-discharge process.
Through integrating solar energy from net contravariant power supply system and solar energy grid-connected contravariant power supply system and using together, make it can distribute in a flexible way from net and the power of being incorporated into the power networks, but just so have a problem: the simple combination of off-grid and grid-connection cannot effectively utilize electric energy, and the power consumption requirement of each load is different.
Therefore, the invention provides a distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system for a house, as shown in fig. 1, the power supply system comprises a photovoltaic power grid, a household power grid and a public power grid, the photovoltaic power grid and the public power grid supply power to the household power grid in an off-grid and grid-connected exchange mode, a distributed power grid layer is formed in the off-grid and grid-connected exchange process, the distributed power grid layer is used for weakening the function of an energy storage side in the photovoltaic power grid, and the energy storage side is used for storing electric energy converted by the photovoltaic power grid when the power grid is off-grid, namely, the photovoltaic power grid and the public power grid play a role of an energy storage battery, and then the electric energy is converted into alternating current by an inverter to transmit power to the household power grid, but the long-term service life of the energy storage battery is greatly reduced and is always in a state of charging and using while the energy storage battery is always in a state of extremely consuming the stored electric energy when the photovoltaic power grid and the public power grid are both off-grid are powered, so that the energy storage battery is greatly damaged, and the damage to the energy storage battery is reduced by weakening the use of the energy storage side, the off-grid exchange;
furthermore, the weakening of the use of the energy storage side also enables a reduction in energy consumption, since during the energy storage process there is a consumption of electrical energy, in particular during the conversion into thermal energy.
In order to weaken the energy storage side, a three-level distribution electric network layer is formed in the process of grid disconnection and connection interchange, and specifically comprises a first-level photovoltaic electric network layer, a second-level common electric network layer and a three-level energy storage electric network layer, wherein:
the primary photovoltaic grid layer mainly supplies photovoltaic power and secondarily supplies public power;
the secondary common power grid layer takes public power supply as a main part and photovoltaic power supply as an auxiliary part;
the three-level energy storage electric network layer only uses the energy storage of the energy storage side to complete power supply, and the power supply objects of the first-level photovoltaic electric network layer, the second-level common electric network layer and the three-level energy storage electric network layer are all household electric networks.
Furthermore, the energy storage side absorbs the electric energy of the first-level photovoltaic grid layer and the second-level common grid layer for storage, and the photovoltaic power supply is also absorbed by the common grid under the condition of over energy, wherein the over energy means that the electric energy generated by the photovoltaic power supply exceeds the power consumption requirement of a household grid, and the energy storage side does not absorb the electric energy requirement at the moment.
In the first embodiment, as shown in fig. 1, the photovoltaic grid includes a photovoltaic group, a photovoltaic inverter, and an energy storage module, the photovoltaic group absorbs solar energy through a solar panel cooperating with a junction piece and converts the solar energy into direct current, the photovoltaic inverter converts the direct current into alternating current of 220V, and the energy storage module forms an energy storage side to be connected to the photovoltaic group to store electric energy abundant in the photoelectric conversion process, which is a general power generation technology in the photoelectric field, and therefore, the description is omitted here, but the point to be emphasized is:
in the embodiment, the photovoltaic inverter is simultaneously connected with the output ends of the photovoltaic group and the energy storage module, that is, the photovoltaic group and the energy storage module share one photovoltaic inverter, and no redundant photovoltaic inverter is needed, so that one photovoltaic inverter is omitted in a power supply mode of a distributed power grid layer, and the cost of a power supply system in the actual use process is reduced.
In fig. 2, there are inverter circuit, inversion input side and inversion output side in the photovoltaic inverter, and photovoltaic group and energy storage module are connected to the inversion input side, and one between the two is to inverter circuit input direct current, and through inverter circuit back inversion output side output alternating current, what be connected with the inversion output side is family's electric wire netting and public electric wire netting, wherein:
referring to fig. 3, the inverter circuit preferably employs an IGBT inverter circuit, which includes power field effect transistors Q1, Q2, Q3, and Q4, diodes D1, D2, D3, and D4, and transformers T1 and T2 forming an inverter input side; the power field effect transistors Q1, Q2, Q3 and Q4 adopt IGBT (insulated gate bipolar transistor) to form a full bridge inverter circuit, furthermore, the phase difference between the power field effect transistors Q1 and Q2 is 180 degrees, and the value of the output alternating voltage changes along with the output change of the power field effect transistors Q1 and Q2; the power field effect transistors Q3 and Q4 are conducted at the same time to form a follow current loop, so that the waveform of the voltage U output by the inverting output side is not influenced by the inductive load, and the problems of poor capacity with the inductive load and low efficiency of the transformer are solved.
It should be noted that, the front-stage DC-DC converter in the inverter circuit uses a PIC16F873 single chip microcomputer as a control core, the rear-stage DC-AC part uses a full-bridge inverter circuit using a high-performance DSP chip TMS320F240 as a control core, and the transformers T1 and T2 are respectively connected to the photovoltaic group and the energy storage module, so as to realize that one photovoltaic inverter is used by the photovoltaic group and the energy storage module, that is, to realize the effect of "one", in addition, a resistor R1 is connected in series between the transformer T1 and the photovoltaic group, and a resistor R2 is connected in series between the transformer T2 and the energy storage module, so as to play a role of protection.
During operation, solar energy is absorbed by a solar cell of the photovoltaic group, then the solar cell is converted into direct current to be input to a photovoltaic inverter, the direct current is converted into alternating current through the photovoltaic inverter and then is input to a household power grid, then a first-level photovoltaic power grid layer mainly powered by photovoltaic is formed, and two conditions can occur in the process:
firstly, the power consumption requirement of a household power grid is met, the energy storage module does not have the requirement of absorbing electric energy, and redundant electricity is fed back to a public power grid at the moment;
and secondly, the requirement of the household power grid power utilization cannot be met, but the energy storage module is not considered to be used, because the power utilization requirement of the household power grid is fluctuated at the moment, the energy storage module is used for frequently supplementing, the service life of the energy storage module can be greatly reduced, and therefore the public power grid is directly utilized for supplementing power supply to play an auxiliary role, so that the economic benefit of the visible primary photovoltaic power grid layer is the highest.
In rainy days, the conversion efficiency of the photovoltaic group is relatively low, at this time, in order to ensure that the household power grid is normally used, a secondary public power grid layer is carried out, the main public power grid is directly used in the secondary public power grid layer for supplying power, the auxiliary photovoltaic group is in a silent state, the converted electric energy is directly fed back to the public power grid (even if the energy storage module has the requirement of absorbing the electric energy, the electric energy converted by the photovoltaic group is directly fed back to the public power grid, because the efficiency of converting the electric energy by the photovoltaic group is low, the requirement of the energy storage module cannot be met during charging, and the damage to the energy storage module can also be caused), the electricity demand of the household power grid can be met under the condition of normal use of the public power grid, but the condition of power failure cannot be avoided, once the power failure in the secondary public power grid layer can not be supplemented by the photovoltaic group, the energy storage network layer can enter the tertiary energy storage grid layer, the stage is the place where the energy storage module is only used by the whole power supply system, namely, the energy storage module is the last guarantee of the whole power supply system, and the stage can be connected by the premise that the photovoltaic group is changed as follows:
because only the public power grid participates in the power supply process of the secondary public power grid layer, once the public power grid is powered off, the household power grid immediately loses power, a transition time is needed when the energy storage module participates in the power supply, and the photovoltaic group does not stop working (the photovoltaic group feeds back electric energy to the public power grid in the secondary public power grid layer), so that the household power grid is supplied with power through the photovoltaic group, although the electric energy is weak, the household power grid can adapt to the power off condition, a certain current can be ensured to exist in the household power grid, a buffer is provided for the intervention of the energy storage module, the damage to a household circuit is avoided, and the energy storage module is protected as far as possible;
in addition, after the energy storage module completes the transition, the electric energy generated by the photovoltaic group is continuously fed back to the public power grid.
Therefore, the photovoltaic groups in the first-stage photovoltaic grid layer, the second-stage common grid layer and the third-stage energy storage grid layer can feed back electric energy, so that the electric energy converted by the optical energy can be utilized to the maximum degree in any stage, and the energy storage module only participates in the power supply of a household grid and does not participate in the feeding back of the electric energy, so that the consumption of the energy storage module on the electric energy is reduced.
It should be noted that, if say that when the photovoltaic group can not convert the electric energy, inevitable can cause the damage to family's electric wire netting and energy storage module, but power supply system weakens the use of energy storage module, has reduced the damage to energy storage module on the whole, and the linking of photovoltaic group is better protection energy storage module when weakening.
In a second embodiment, please refer to fig. 4, a home power grid includes a distribution module and a load group, the load group is composed of a plurality of load terminals (various electric devices, circuits, etc.) in a plurality of residences, in the first embodiment, all the load terminals directly use the home power grid, so no separate description is provided, but in the present embodiment, considering that the power demand of each load terminal is different, if the home power grid is used uniformly, a load is brought to the power supply side of the home power grid, and an overload may occur, which brings a great safety hazard to the residences, so the present embodiment uses the distribution module, the distribution module receives the electric energy input from the power supply side (i.e., the photovoltaic power grid and the public power grid, i.e., the photovoltaic inverter and the public power grid), and forms a distribution line connected to the load terminals, a tuner is provided at a port of the distribution module connected to the public power grid, and a single tuner and the public power grid can implement two-stage electric energy matching, so that both the electric energy and the tuner can be utilized maximally, the two stages are specifically as follows:
in the process of supplying power to the first-level photovoltaic power grid layer, firstly, alternating current output by the photovoltaic inverter averagely flows into each distribution line, but the power consumption condition of a load end in each distribution line is different, and then the distribution line is connected to a public power grid, so that feedback electric energy of the distribution lines is received, and on the other hand, the electric energy supplied by the public power grid is allocated through the allocating device according to the power consumption requirement of each distribution line, so that the problem that one or more distribution lines cannot meet the power consumption requirement of the load end is avoided, the load of a photovoltaic group is reduced, and the pertinence of supplementing electric energy to the public power grid is guaranteed;
in the process of supplying power to the secondary public power grid layer, the public power grid directly allocates the electric energy supplied by the public power grid through the allocator according to the power consumption requirement of each distribution line.
In a third embodiment, please refer to fig. 5, a feedback channel is disposed between the distribution module and the energy storage module, and the distribution module and the energy storage module perform bidirectional feedback, and the energy storage module feeds back the energy storage capacity to the distribution module, and then performs reasonable distribution by the distribution module, for example: when the energy storage capacity is not enough for all load ends to work, the power supply to the load ends is stopped by adopting a mode of cutting off the distribution line, so that the rationality of energy storage use is ensured as much as possible; the distribution module also can carry out the feedback of power consumption demand to energy storage module simultaneously, and the distribution module passes through the cell-phone or the TV interconnection of wiFi and family to and know the weather condition near term in time, perhaps the outage notice, can be timely like this carry out the stand-by electricity according to the power consumption demand of feedback, guarantee that last power supply defence line is not broken through.
It should be noted that the source of the energy storage module absorbing the electric energy is the public power grid and the photovoltaic group, and the energy storage module does not charge in real time, because the power supply system hardly starts the energy storage module, the energy storage module is not required to charge in real time, and the energy storage module is only required to be kept in a half-power state and is passively charged when the energy storage module is lower than the half-power state, so that the energy storage module can be protected, and active charging can be performed according to the power consumption requirement when the energy storage module is in standby power.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides a house is with distributed off-grid and in-grid photovoltaic energy storage contravariant power supply system which includes photovoltaic electric wire netting, family electric wire netting and public electric wire netting, photovoltaic electric wire netting and public electric wire netting supply power to the family electric wire netting through the mode of the interchange that is off-grid and in-grid, its characterized in that: the photovoltaic power grid is internally provided with an energy storage side, a distribution power grid layer is formed in the off-grid and on-grid interchange process, and the distribution power grid layer is used for weakening the function of the energy storage side.
2. The residential distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system according to claim 1, characterized in that: three-level distributed power grid layers are formed in the process of grid-connected exchange, namely a first-level photovoltaic power grid layer, a second-level common power grid layer and a third-level energy storage power grid layer, power supply objects of the first-level photovoltaic power grid layer, the second-level common power grid layer and the third-level energy storage power grid layer are all household power grids, and the three-level distributed power grid layers are characterized in that:
the primary photovoltaic grid layer mainly supplies photovoltaic power and secondarily supplies public power;
the secondary common power grid layer takes common power supply as a main part and photovoltaic power supply as an auxiliary part;
and the three-stage energy storage electric network layer only completes power supply by the energy storage of the energy storage side.
3. The residential distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system according to claim 2, characterized in that: the energy storage side is used for absorbing electric energy of the first-level photovoltaic electric network layer and the second-level public electric network layer for storage, and photovoltaic power supply is absorbed by the public electric network under the condition of energy excess.
4. The residential distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system according to claim 1, characterized in that: the photovoltaic power grid comprises a photovoltaic group, a photovoltaic inverter and an energy storage module, wherein the photovoltaic group absorbs solar energy and converts the solar energy into direct current, and the photovoltaic inverter converts the direct current into 220V alternating current;
the energy storage module forms an energy storage side and is connected with the photovoltaic group;
the photovoltaic inverter is connected with the photovoltaic group and the output end of the energy storage module.
5. The residential distributed grid-disconnected photovoltaic energy storage inversion power supply system according to claim 4, characterized in that: the photovoltaic inverter is internally provided with an inverter circuit, an inverter input side and an inverter output side, the inverter input side is connected with a photovoltaic group and an energy storage module, direct current is input to the inverter circuit between the photovoltaic group and the energy storage module, the direct current is output to the inverter circuit through the inverter output side, and the inverter output side is connected with a household power grid and a public power grid.
6. The residential distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system according to claim 5, characterized in that: the inverter circuit is an IGBT inverter circuit, and the IGBT inverter circuit comprises power field effect transistors Q1, Q2, Q3 and Q4, diodes D1, D2, D3 and D4, and transformers T1 and T2 forming an inverter input side;
the power field effect transistors Q1, Q2, Q3 and Q4 adopt IGBT to form a full-bridge inverter circuit;
the phase difference between the power field effect transistors Q1 and Q2 is 180 °;
and the power field effect transistors Q3 and Q4 are simultaneously conducted to form a follow current loop.
7. The residential distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system according to claim 1, characterized in that: the household power grid comprises a distribution module and a load group with a plurality of load ends, wherein the distribution module receives electric energy input by a photovoltaic power grid and a public power grid and forms a distribution line connected with the load ends.
8. The residential distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system according to claim 7, characterized in that: and a port of the distribution module connected with the public power grid is provided with a tuner.
9. The residential distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system according to claim 7, characterized in that: a feedback channel for bidirectional feedback is arranged between the distribution module and the energy storage side, wherein:
the energy storage side block feeds back the energy storage capacity to the distribution module, and distributes the energy storage capacity to the distribution lines by means of the distribution module;
the distribution module feeds back the power demand to the energy storage side to trigger the energy storage side to carry out standby power.
10. The residential distributed off-grid and grid-connected photovoltaic energy storage inversion power supply system according to claim 9, characterized in that: the charging of the energy storage side comprises passive charging and active charging, and the energy storage side carries out passive charging when the energy storage side is lower than a half-power state; and the energy storage side carries out active charging according to the feedback power demand when the power is standby.
Priority Applications (1)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199564A (en) * | 2013-04-18 | 2013-07-10 | 山东圣阳电源股份有限公司 | Intelligent power grid distributed self-supporting photovoltaic power supply system |
| CN204119152U (en) * | 2014-10-28 | 2015-01-21 | 保定嘉盛光电科技有限公司 | Photovoltaic power supply system intelligent inverter |
| CN104333247A (en) * | 2014-10-13 | 2015-02-04 | 华南理工大学 | Cascaded multilevel single-phase inverter and cascaded multilevel three-phase inverter adopting novel three-terminal switching networks |
| CN106059054A (en) * | 2016-06-22 | 2016-10-26 | 湖北竑光新能源科技有限公司 | Grid-connected and off-grid photovoltaic power generation switching system |
| CN110718937A (en) * | 2019-11-08 | 2020-01-21 | 广东中光能投资有限公司 | Photovoltaic energy storage power distribution control method and system for smart home |
| CN113300403A (en) * | 2021-05-27 | 2021-08-24 | 中清能绿洲科技股份有限公司 | Solar micro-grid energy storage capacity configuration optimization processing system and processing method |
-
2022
- 2022-12-08 CN CN202211570055.7A patent/CN115733185A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199564A (en) * | 2013-04-18 | 2013-07-10 | 山东圣阳电源股份有限公司 | Intelligent power grid distributed self-supporting photovoltaic power supply system |
| CN104333247A (en) * | 2014-10-13 | 2015-02-04 | 华南理工大学 | Cascaded multilevel single-phase inverter and cascaded multilevel three-phase inverter adopting novel three-terminal switching networks |
| CN204119152U (en) * | 2014-10-28 | 2015-01-21 | 保定嘉盛光电科技有限公司 | Photovoltaic power supply system intelligent inverter |
| CN106059054A (en) * | 2016-06-22 | 2016-10-26 | 湖北竑光新能源科技有限公司 | Grid-connected and off-grid photovoltaic power generation switching system |
| CN110718937A (en) * | 2019-11-08 | 2020-01-21 | 广东中光能投资有限公司 | Photovoltaic energy storage power distribution control method and system for smart home |
| CN113300403A (en) * | 2021-05-27 | 2021-08-24 | 中清能绿洲科技股份有限公司 | Solar micro-grid energy storage capacity configuration optimization processing system and processing method |
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