CN109494860B - Online interactive solar grid-connected and off-grid energy storage three-in-one all-in-one machine and control method - Google Patents
Online interactive solar grid-connected and off-grid energy storage three-in-one all-in-one machine and control method Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 19
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- 238000004804 winding Methods 0.000 claims abstract description 28
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 22
- 230000005611 electricity Effects 0.000 claims description 18
- 238000010248 power generation Methods 0.000 claims description 18
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims 1
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H02J3/385—
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- 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
Abstract
The invention discloses an online interactive solar grid-connected and grid-disconnected energy storage three-in-one machine and a control method, wherein the machine comprises a mains supply power grid interface, a load interface, a solar photovoltaic panel interface, a transformer module, a bidirectional converter, a storage battery pack interface, a processor module, a clock module, a display module and an MPPT inverter; the output winding of the transformer module is connected with the storage battery pack interface through the bidirectional converter, the solar photovoltaic panel interface is respectively connected with the storage battery pack interface and the output winding of the transformer module through the MPPT inverter, and the processor module is respectively connected with the clock module, the display module, the MPPT inverter and the bidirectional converter. According to the invention, three functions of grid-connected and grid-disconnected energy storage of the solar photovoltaic system are effectively combined together through the bidirectional converter, the MPPT inverter and the transformer module, so that an integrated function is realized, overall control is carried out through the processor module, and the intelligent degree of the device is greatly improved.
Description
Technical Field
The invention relates to the technical field of solar power supply.
Background
In the field of solar power supply, the traditional solar grid-connected machine cannot be disconnected from a mains supply, namely cannot be operated off the grid, so that a storage battery pack is not required to be configured. The currently favored solar roof power generation system adopts the traditional solar grid-connected machine, the basic operation condition of the civil solar roof power generation system is that the solar power generation system is used for selling electricity in the daytime, and the commercial power is used for supplying power at night, which is equivalent to buying electricity, so the economic benefit is not high.
Therefore, related technicians in the technical field provide a grid-connected and grid-disconnected energy storage three-in-one solar power generation system, the solar power generation system is only provided with a mains supply power supply mode and a solar battery complementary power supply mode, and the working principle is as follows: the solar energy charges the battery, when the electric quantity of the battery accords with the preset value of inversion priority, the power generation system cuts off the commercial power, the solar energy and the battery are inverted to supply power, when the voltage of the battery is lower, the power generation system accesses the commercial power again, the solar energy is utilized to charge the battery, and the process is circulated. However, the grid-connected machine and the off-grid machine of the grid-connected machine and the storage battery pack are simply combined together, the grid-connected machine and the off-grid machine are independently separated, integration cannot be realized, the manufacturing cost is high, and the intelligent degree is insufficient.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: an online interactive solar grid-connected and grid-disconnected energy storage three-in-one machine and a control method thereof are provided.
The solution of the invention for solving the technical problem is as follows:
the online interactive solar grid-connected and grid-disconnected energy storage three-in-one machine comprises a mains supply power grid interface, a load interface, a solar photovoltaic panel interface, a transformer module, a bidirectional converter, a storage battery pack interface, a processor module, a clock module, a display module and an MPPT inverter configured with an MPPT algorithm, wherein the transformer module comprises an input winding and an output winding; the solar photovoltaic panel interface is respectively connected with the storage battery pack interface and the output winding of the transformer module through the MPPT inverter, and the processor module is respectively connected with the clock module, the display module, the MPPT inverter and the bidirectional converter.
As a further improvement of the above technical solution, a toroidal transformer module is used in the transformer module.
As a further improvement of the above technical solution, the present technical solution further includes a first shunt branch and a second shunt branch, the first shunt branch includes a plurality of shunt units connected in parallel, each shunt unit includes a first relay RY1 and a thermistor R1, two ends of the thermistor R1 are respectively connected to an output contact of the first relay RY1, the second shunt branch includes two or more second relays RY2 connected in parallel, a switching time of the second relay RY2 is less than 8ms, and a switching time of the first relay RY1 is greater than 8 ms; the first shunt branch is connected with the second shunt branch in series, the mains supply grid interface is connected with the first shunt branch, the second shunt branch is connected with an input winding of the transformer module, and the processor module is respectively connected with each first relay RY1 and each second relay RY 2.
As a further improvement of the above technical solution, the second shunt branch is provided with a plurality of taps, the input winding is provided with a plurality of taps, and each tap of the input winding is connected to the second relay RY2 of each second shunt branch.
As a further improvement of the above technical solution, the technical solution further includes a plurality of diodes, anodes of the plurality of diodes are all connected to the AC-DC power supply module through a resistor, and cathodes of the respective diodes are connected to the respective first relays RY1 and the second relays RY2, respectively.
As a further improvement of the above technical solution, the specification of the first relay RY1 is switching voltage 12V, switching current 120A; the specification of the second relay RY2 is switching voltage 12V and switching current 40A.
The invention also discloses a control method of the online interactive solar grid-connected and grid-disconnected energy storage three-in-one all-in-one machine, which comprises the following steps:
step 300, charging a storage battery pack and supplying power to a load respectively by using a solar photovoltaic panel through an MPPT inverter and a transformer module during daytime, and simultaneously carrying out grid-connected power generation;
and 400, supplying power to the load by the storage battery pack through the bidirectional converter and the transformer module according to the real-time power requirement of the load at night.
As a further improvement of the above technical solution, step 300 specifically includes the following steps:
step 310, setting a critical value of illumination intensity;
step 320, detecting the real-time illumination intensity;
and 330, when the real-time illumination intensity is greater than the illumination intensity critical value, the solar photovoltaic panel charges the storage battery pack and supplies power to the load through the MPPT inverter and the transformer module respectively, and is simultaneously connected to the grid for power generation.
As a further improvement of the above technical solution, in step 300, in daytime, an operation mode may be set online, where the operation mode includes a grid-connected power transmission mode; and determining whether the solar photovoltaic panel is in grid-connected power supply when the real-time illumination intensity is greater than the illumination intensity critical value according to whether the grid-connected power transmission mode is selected.
As a further improvement of the above technical solution, in step 300, when a power failure of the utility grid is detected, the power supply mode of the load is switched to hybrid power supply of the solar photovoltaic panel and the storage battery.
The invention has the beneficial effects that: according to the invention, three functions of grid-connected and grid-disconnected energy storage of the solar photovoltaic system are effectively combined together through the bidirectional converter, the MPPT inverter and the transformer module, so that an integrated function is realized, overall control is carried out through the processor module, and the intelligent degree of the device is greatly improved.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.
FIG. 1 is a system framework diagram of the present invention;
fig. 2 is a circuit schematic diagram of embodiment 1 of the present invention;
fig. 3 is a circuit schematic diagram of embodiment 2 of the present invention.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive efforts based on the embodiments of the present application belong to the protection scope of the present application. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Referring to fig. 1, the application discloses an online interactive solar grid-connection and grid-disconnection energy storage three-in-one machine, which comprises a mains supply power grid interface, a load interface, a solar photovoltaic panel interface, a transformer module, a bidirectional converter, a storage battery pack interface, a processor module, a clock module, a display module and an MPPT inverter configured with an MPPT algorithm, wherein the transformer module comprises an input winding and an output winding; the solar photovoltaic panel interface is respectively connected with the storage battery pack interface and the output winding of the transformer module through the MPPT inverter, and the processor module is respectively connected with the clock module, the display module, the MPPT inverter and the bidirectional converter. The processor module comprises an MCU (microprogrammed control Unit) controller and a DSP (digital signal processor) controller, and as the DSP controller has a strong data operation function, the DSP controller is used for processing a program algorithm related to a grid-connected function of the solar photovoltaic system, and the rest program algorithm is borne by the MCU controller, the energy bidirectional flow with the same power can be realized, and the functions of grid connection, grid disconnection and energy storage are realized.
According to the technical scheme, three functions of grid-connected and grid-disconnected energy storage of the solar photovoltaic system are effectively combined together through the bidirectional converter, the MPPT inverter and the transformer module, the integrated function is realized, overall control is carried out through the processor module, and the intelligent degree of the device is greatly improved.
Further, in a preferred embodiment, in the present application, a toroidal transformer module is used as the transformer module. The toroidal transformer module has high efficiency and strong loading capacity, and can carry inductive and capacitive loads when being off-grid. However, because the toroidal transformer module belongs to a closed-loop magnetic circuit, the time for establishing the magnetic circuit is very short, so that the switching-on current of the commercial power is several times larger than the working current, therefore, when the technical scheme is started, inversion is needed firstly, the toroidal transformer module forms the magnetic circuit, and then the commercial power is connected to a commercial power grid, so that the switching-on current of the toroidal transformer module is reduced, and the volume of the toroidal transformer module is reduced. In addition the toroidal transformer module can dispose a plurality ofly, a plurality of the toroidal transformer module is parallelly connected, the toroidal transformer module generally is provided with supporting inductance, and the secondary winding of toroidal transformer module designs according to the electric current of contravariant direct current end and forms a complete set, absorbs the high order harmonic, and this high order harmonic is 20 KHZ's sinusoidal pulse wave SPWM specifically, because the magnetic circuit of toroidal transformer module is closed magnetic circuit, very easily saturates, especially when the commercial power switches to the contravariant, if do not strain 20 KHZ's sinusoidal pulse wave SPWM carrier wave, the transformer module just saturates, is equivalent to the short circuit and has led to exploding the power tube, this is the reason that the toroidal transformer module can not be applied to the dc-to-ac converter in the prior art.
Referring to fig. 2, further as a preferred embodiment, in the present application,
embodiment 1, the present application further includes a first shunt branch and a second shunt branch, the first shunt branch includes a plurality of shunt units connected in parallel, each shunt unit includes a first relay RY1 and a thermistor R1, two ends of the thermistor R1 are respectively connected to output contacts of the first relay RY1, the second shunt branch includes two or more second relays RY2 connected in parallel, a switching time of the second relay RY2 is less than 8ms, and a switching time of the first relay RY1 is greater than 8 ms; the first shunt branch is connected with the second shunt branch in series, the mains supply grid interface is connected with the first shunt branch, the second shunt branch is connected with an input winding of the transformer module, and the processor module is respectively connected with each first relay RY1 and each second relay RY 2. According to the photovoltaic power generation system, the switching time of the photovoltaic power generation system is guaranteed through the second relays RY2, the load is compensated and supplied with power through the bidirectional converter within the switching time, the shunt unit 110 composed of the first relay RY1 and the thermistor R1 bears large-current impact to protect the second relay RY2, the switching time of the photovoltaic power generation system and the safety of the second relay RY2 connected in parallel are guaranteed, and therefore the high-power photovoltaic power generation system is achieved.
Referring to fig. 3 and embodiment 2, an improvement is made on the basis of embodiment 1, in embodiment 2, the second shunt branch 200 is provided with a plurality of taps, the input winding is provided with a plurality of taps, and each tap of the input winding is connected to the second relay RY2 of each second shunt branch 200.
Specifically, when the mains supply is unstable, the photovoltaic system needs to perform voltage stabilization operation on the mains supply, in the process, the first relay RY1 in a closed state is firstly disconnected, the bidirectional converter is started again, the storage battery pack is used for supplying power to a load through the bidirectional converter, then the second relay RY2 corresponding to a tap of an input winding of the transformer module needing voltage stabilization is attracted, the voltage stabilization function of the mains supply is realized by changing the number of turns of the input winding of the transformer module, then the first relay RY1 is closed, the inversion function of the storage battery pack to the load is finally interrupted, the time required in the whole process is the attraction time of the first relay RY1, and through the technical means, the average current passing through the second relay RY2 connected in parallel is also ensured.
Further as a preferable implementation manner, the technical solutions of embodiment 1 and embodiment 2 in this application further include a plurality of diodes, anodes of the plurality of diodes are all connected to a power supply terminal through a resistor, and cathodes of the respective diodes are respectively connected to the respective first relays RY1 and the second relays RY 2. Each diode mainly starts the interlocking effect, only when the negative pole potential of one of the diodes is pulled down by the processor module, the first relay RY1 can realize the closing operation, at this moment, the processor module does not need to be directly connected with each first relay RY1, the processor module can indirectly control the first relay RY1 through a port connected with the second relay RY2, referring to fig. 2, the processor module outputs the low potential through the PASS port to control the closing of the second relay RY2 of the second shunt branch 200, and through the effect of the diode connected with the PASS port, the first relay RY1 of the first shunt branch 100 can be closed.
Further, as a preferable embodiment, in the technical solutions of embodiment 1 and embodiment 2 in the present application, the specifications of the first relay RY1 are switching voltage 12V, switching current 120A; the specification of the second relay RY2 is switching voltage 12V and switching current 40A.
The application also discloses a control method of the online interactive solar grid-connected and grid-disconnected energy storage three-in-one all-in-one machine, which comprises the following steps:
step 300, charging a storage battery pack and supplying power to a load respectively by using a solar photovoltaic panel through an MPPT inverter and a transformer module during daytime, and simultaneously carrying out grid-connected power generation;
and 400, supplying power to the load by the storage battery pack through the bidirectional converter and the transformer module according to the real-time power requirement of the load at night.
The residential roof solar power generation system is taken as an example for explanation, firstly, a user needs to calculate the maximum power of electricity consumed by the user at night according to the electricity consumption condition of the user at night, and the electricity consumption time of the user at night is set; then according to the maximum power and the power consumption time of the electricity consumption at night, a storage battery pack is configured, when the sunlight is sufficient in the daytime, the solar energy is firstly utilized to charge the storage battery pack with the required electric energy, meanwhile, the load is supplied with the electric energy, the redundant electric energy is connected to the grid to generate electricity for the mains supply power grid, when the electricity consumption at night is realized, the electricity is supplied through the storage battery pack according to the power of the load electricity consumption, as is known, the benefit is the highest when the solar energy is completely used up, and as long as the electric energy stored in the storage battery pack meets the requirements of users at night, the users do not need to get electricity from the mains supply power grid any more, so that the real zero electricity fee is obtained. Because the integrated machine adopts the grid-connected technology, the storage battery does not need to be separated from a power grid when discharging at night, the discharge of the storage battery is controlled according to the power of a load, and the storage battery is configured according to the day of the maximum load during design, so that the storage battery can discharge deeply under few conditions, the deep discharge and charge-discharge times of the storage battery are reduced, and the service life of the storage battery is prolonged.
Further as a preferred embodiment, in the present application, the step 300 specifically includes the following steps:
step 310, setting a critical value of illumination intensity;
step 320, detecting the real-time illumination intensity;
and 330, when the real-time illumination intensity is greater than the illumination intensity critical value, the solar photovoltaic panel charges the storage battery pack and supplies power to the load through the MPPT inverter and the transformer module respectively, and is simultaneously connected to the grid for power generation.
Further as a preferred embodiment, in the present specific embodiment, in step 300, in the daytime, an operation mode may be set online, where the operation mode includes a grid-connected power transmission mode; and determining whether the solar photovoltaic panel is in grid-connected power supply when the real-time illumination intensity is greater than the illumination intensity critical value according to whether the grid-connected power transmission mode is selected. In the technical scheme, a user can set the operation mode of the all-in-one machine according to the self requirement so as to adjust the collocation operation of each functional module in the all-in-one machine. Meanwhile, the operation mode further comprises a peak staggering power utilization mode, when the integrated machine operates in the peak staggering power utilization mode, the storage battery pack can be charged by using a mains supply power grid in the valley, the storage battery pack is controlled to discharge and supply power in the peak, and the technical problem that the peak staggering power limiting is required due to insufficient power supply of a power system in summer can be solved.
Further as a preferred embodiment, in the present application, in the specific embodiment, when a power failure of the utility grid is detected in step 300, the power supply mode of the load is switched to hybrid power supply of the solar photovoltaic panel and the storage battery pack. Therefore, the all-in-one machine has the uninterrupted power supply function, intelligent equipment such as a computer is prevented from being halted, normal operation of a load is not influenced, and solar power generation and power supply can be fully utilized to supply power to the load under the condition of power failure.
While the preferred embodiments of the present invention have been described in detail, it should be understood that the invention is not limited to those precise embodiments, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined in the appended claims.
Claims (5)
1. On-line interactive solar grid-connected and off-grid energy storage three-in-one machine is characterized in that: the system comprises a mains supply power grid interface, a load interface, a solar photovoltaic panel interface, a transformer module, a bidirectional converter, a storage battery pack interface, a processor module, a clock module, a display module and an MPPT inverter configured with an MPPT algorithm, wherein the transformer module comprises an input winding and an output winding; one pole of the commercial power grid interface is connected with the load interface through an input winding of a transformer module, an output winding of the transformer module is connected with the storage battery pack interface through a bidirectional converter, the solar photovoltaic panel interface is respectively connected with the storage battery pack interface and the output winding of the transformer module through an MPPT inverter, the processor module is respectively connected with the clock module, the display module, the MPPT inverter and the bidirectional converter,
the transformer module uses a ring transformer module, the ring transformer module forms a magnetic circuit under the inversion action and then is connected with a commercial power grid, a secondary winding is arranged on the ring transformer module and is used for absorbing high-order harmonic waves to prevent the ring transformer module from being saturated,
the shunt circuit also comprises a first shunt branch (100) and a second shunt branch (200), wherein the first shunt branch (100) comprises a plurality of shunt units (110) which are connected in parallel, each shunt unit (110) comprises a first relay RY1 and a thermistor R1, two ends of each thermistor R1 are respectively connected with an output contact of the first relay RY1, the second shunt branch (200) comprises more than two second relays RY2 which are connected in parallel, the switching time of the second relays RY2 is less than 8ms, and the switching time of the first relays RY1 is more than 8 ms; the first shunt branch (100) is connected in series with the second shunt branch (200), the other pole of the mains supply grid interface is connected with the first shunt branch (100), the second shunt branch (200) is connected with an input winding of a transformer module, the processor module is respectively connected with each first relay RY1 and each second relay RY2,
if the mains supply is unstable, the first relay RY1 in the closed state is disconnected to restart the bidirectional converter, the storage battery pack is used for supplying power to the load through the bidirectional converter, the second relay RY2 corresponding to the input winding tap of the transformer module needing voltage stabilization is attracted, the mains supply voltage stabilization function is realized by changing the number of turns of the input winding of the transformer module, the first relay RY1 is closed, and finally the inversion function of the storage battery pack to the load is interrupted.
2. The on-line interactive solar grid-connected and off-grid energy storage three-in-one machine as claimed in claim 1, wherein: the second shunt branch (200) is provided with a plurality of taps, the input winding is provided with a plurality of taps, and each tap of the input winding is connected to the second relay RY2 of each second shunt branch (200).
3. The on-line interactive solar grid-connected and off-grid energy storage three-in-one machine as claimed in claim 1, wherein: the power supply further comprises a plurality of diodes, the anodes of the diodes are connected with the AC-DC power supply module through a resistor, and the cathodes of the diodes are respectively connected with the first relays RY1 and the second relays RY 2.
4. The on-line interactive solar grid-connected and off-grid energy storage three-in-one machine as claimed in claim 1, wherein: the specification of the first relay RY1 is switching voltage 12V and switching current 120A; the specification of the second relay RY2 is switching voltage 12V and switching current 40A.
5. A control method of an online interactive solar grid-connection and grid-disconnection energy storage three-in-one all-in-one machine is applied to the online interactive solar grid-connection and grid-disconnection energy storage three-in-one all-in-one machine as claimed in any one of claims 1 to 4, and is characterized by comprising the following steps:
step 100, calculating the maximum power of the power consumption of the user at night according to the user requirement, and setting the power consumption time of the user at night;
step 200, configuring a storage battery pack according to the calculated maximum power and electricity utilization time of the user electricity utilization at night;
step 300, charging a storage battery pack and supplying power to a load respectively by using a solar photovoltaic panel through an MPPT inverter and a transformer module during daytime, and simultaneously carrying out grid-connected power generation;
and 400, supplying power to the load by the storage battery pack through the bidirectional converter and the transformer module according to the real-time power requirement of the load at night.
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| CN104362670A (en) * | 2014-10-21 | 2015-02-18 | 上海电机学院 | Non-schedulable solar power generation and mains supply complementary system |
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| CN108039732A (en) * | 2017-12-29 | 2018-05-15 | 南京熊猫电子股份有限公司 | A kind of and the one-piece type photovoltaic energy-storage system power supply of off-network and its control method |
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