CN216489784U

CN216489784U - Photovoltaic mobile power station capable of being connected to grid and operated off grid

Info

Publication number: CN216489784U
Application number: CN202122302797.9U
Authority: CN
Inventors: 孙丽兵; 方林中; 王谨; 王金玉; 李达非; 郭占东
Original assignee: Smart Power Shanghai Power Technology Co ltd; Shanghai Technical Institute of Electronics and Information
Current assignee: Smart Power Shanghai Power Technology Co ltd; Shanghai Technical Institute of Electronics and Information
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-05-10
Anticipated expiration: 2031-09-23

Abstract

The utility model relates to a photovoltaic mobile power station capable of running in a grid-connected mode and an off-grid mode, which comprises a cabin body, a solar battery assembly, a solar controller, a bidirectional energy storage converter and an energy storage module, wherein the solar battery assembly, the solar controller, the bidirectional energy storage converter and the energy storage module are integrated and arranged in the cabin body, the bidirectional energy storage converter comprises a single-phase inverter and a controller, the solar battery assembly is of a foldable structure, the output end of the solar battery assembly and the output end of the energy storage module are connected into a direct current bus, the direct current bus is electrically connected with the single-phase inverter and used for converting direct current into alternating current to be output to the alternating current bus, and a grid-connected switch is arranged at the output port of the alternating current bus. The utility model can be operated in a grid-connected mode or an off-grid mode, can independently supply power to the outside, can also be accessed to other power stations or power supply system level for combined operation, and is flexible and convenient to use; the solar cell module can be folded and placed in the cabin body, so that the solar cell module is convenient to store and transport and can be unfolded and folded quickly and conveniently; the infrared-resistant stealth detection function can be realized, and the mute stealth effect is achieved; the movement is convenient, and the use is convenient.

Description

Photovoltaic mobile power station capable of being connected to grid and operated off grid

Technical Field

The utility model relates to the technical field of mobile power stations, in particular to a photovoltaic mobile power station capable of being operated in a grid-connected mode and an off-grid mode.

Background

The mobile power station plays an important role in various fields, has the characteristics of mobility and flexibility, and plays a special function in emergency, disasters, emergency lamps and other special occasions requiring power supply urgently. Photovoltaic power plant can realize green power generation, nevertheless because solar cell panel occupation space is great, is not convenient for accomodate and transport, expandes and electrical connection complex operation, consequently has few applications in the mobile power station field. In addition, for military use mobile power station has stealthy functional requirement, and current photovoltaic power station, conversion efficiency is low, and calorific capacity is big, and the noise is high, can't satisfy the demand that infrared stealthy and silence are stealthy. Therefore, in order to fully utilize natural resources, it is urgently needed to develop a photovoltaic mobile power station which is convenient to transport and can meet stealth requirements.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to overcome the defects of the prior art and provide a photovoltaic mobile power station which can be operated on or off a grid, is flexible and convenient to use, is convenient to store and transport, can be quickly and conveniently unfolded and folded, and is convenient to move.

The utility model adopts the following technical scheme:

the utility model provides a photovoltaic mobile power station that can be incorporated into the power networks and move from net, is including the cabin body and the integrated solar module, solar controller, two-way energy storage converter and the energy storage module that set up in the cabin body, two-way energy storage converter is including single-phase dc-to-ac converter and controller, solar module is collapsible structure, and solar module output and energy storage module output merge into direct current bus, and single-phase dc-to-ac converter is connected to the direct current bus electricity for convert the direct current to alternating current and export to alternating current bus, and the controller is used for connecting and controlling the energy storage module, and alternating current bus output port disposes the switch that is incorporated into the power networks, is used for controlling photovoltaic unit and is incorporated into the power networks or moves from the net.

Further, an H-bridge DC/DC converter is included in the solar controller and used for converting the voltage output by the solar cell module into DC400V and incorporating the DC400 into a direct current bus.

Furthermore, the solar controller and the bidirectional energy storage converter are integrated, a photovoltaic inverse control all-in-one machine is adopted, the solar controller adopts an MPPT controller, and the controller adopts a PI regulator.

Furthermore, the energy storage module comprises a plurality of energy storage batteries and an H-bridge DC/DC converter, wherein the H-bridge DC/DC converter is used for converting the voltage output by the plurality of energy storage batteries into DC400V and merging the DC400V into a DC bus.

Further, the solar cell module is including a plurality of flexible solar cell group strings, and the integration is provided with a plurality of solar cells on the solar cell group string, is connected with the portable area on the solar cell group string, can dismantle the concatenation between a plurality of solar cell group strings to through the grafting subassembly electrical connection of mutually supporting.

Further, solar cell group cluster edge is provided with the magic subsides that are used for with other solar cell group cluster concatenations, the magic is pasted the interval and is set up for form rectangular ventilation hole between the adjacent solar cell group cluster, solar cell group cluster is gone up along length direction, the interval is provided with a plurality of ventilation holes between adjacent solar cell.

Furthermore, hangers for connecting the weight are arranged on the outer edge of the solar battery pack string at intervals.

Further, the solar cell adopts an HDT heterojunction solar cell.

Further, the cabin body adopts a container, and an elastic shock pad for buffering vibration is laid on the inner wall of the cabin body.

Furthermore, the bidirectional energy storage converter is provided with a cooling fan, the cooling fan adopts a mute fan controlled by variable frequency, and sound insulation baffles are arranged at the air inlet and the air outlet.

As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:

firstly, the photovoltaic mobile power station adopts a high-integration integrated design, the solar battery assembly is controlled by an MPPT controller, voltage is converted into DC400V through an H-bridge DC/DC converter, the DC400V and the energy storage module are merged into a DC bus, the DC bus converts the voltage into AC230V through a single-phase inverter to supply power to an AC bus, the AC bus supplies power to a load, the load is connected with commercial power through a grid-connected switch, the grid-connected operation and off-grid operation can be realized, the power can be independently supplied to the outside as a main power supply of a power supply system, and the power supply system can be connected to other power stations or other power supply systems for cascade operation, so that the use is flexible and convenient.

Secondly, the solar cell module can be folded and placed in the cabin body under the non-working state, so that the solar cell module is convenient to store and transport; when needs use, paste the concatenation that realizes solar array cluster through the magic, carry out electrical connection through grafting subassembly, easy operation, but quick convenient expansion and remove the receipts. Meanwhile, the solar battery pack string is connected with the hand strap, so that the solar battery pack is convenient to carry. In addition, the foldable and detachable spliced structure of the solar cell module enables the solar cell module to be provided with a larger specification and output larger power, and photovoltaic power generation can be better applied to a mobile power station.

Thirdly, the photovoltaic inversion control all-in-one machine is adopted, the conversion efficiency is high, the heating can be reduced, meanwhile, the HDT heterojunction solar cell is adopted as the solar cell, the conversion efficiency is high, the heating can be further reduced, and the infrared stealth detection resistance is realized. The cooling fan adopts the silence fan that can carry out frequency conversion control, can effectively reduce the production of wind noise, simultaneously advance, air outlet design sound-proof baffle, the propagation path of the effective separation noise reaches the stealthy effect of mobile power station silence.

And fourthly, the ventilation holes are designed on the solar cell module, and the heavy blocks are arranged at the edge of the solar cell module, so that the solar cell module can be smoothly folded and unfolded under the condition of strong wind, and the wind resistance requirement can be effectively met.

Fifthly, the cabin body adopts a standard container, so that the movement is convenient, and the use is convenient. Meanwhile, the elastic shock absorption pads are paved on the inner wall of the cabin body, so that the shock resistance and impact resistance in the transportation process can be improved, and the power station is prevented from being damaged in the transportation process.

Drawings

FIG. 1 is a block diagram of the electrical schematic structure of a photovoltaic mobile power station of the present invention that can be operated both on and off grid;

FIG. 2 is a perspective block diagram of a photovoltaic mobile power plant of the present invention that can be operated both on and off grid;

fig. 3 is a perspective view showing a solar cell module according to the present invention in a folded state;

FIG. 4 is a schematic view of the unfolded structure of the 4 solar cell strings of the present invention after they are spliced;

FIG. 5 is a schematic diagram of the electrical topology of a photovoltaic mobile power plant of the present invention that can be operated both on-grid and off-grid;

FIG. 6 is a schematic diagram of an MPPT control architecture of the present invention;

FIG. 7 is a schematic diagram of the control architecture of the energy storage module of the present invention;

fig. 8 is a schematic diagram of a control structure of the single-phase inverter of the present invention.

In the figure: 1. the solar energy storage battery comprises a cabin, 2 solar battery components, 21 solar battery pack strings, 211 solar batteries, 212 magic tapes, 213 long strip vent holes, 214 circular vent holes, 215 hangers, 22 weight blocks, 3 bidirectional energy storage converters, 4 MPPT controllers, 5.500Wh standardized energy storage battery boxes, 6 elastic shock absorption pads, 7 grid-connected switches and 8 cascade interfaces.

Detailed Description

The utility model is further described below by means of specific embodiments.

Referring to fig. 1 to 5, the photovoltaic mobile power station capable of being operated in a grid-connected mode and an off-grid mode comprises a cabin body 1, a solar cell assembly 2, a solar controller, a bidirectional energy storage converter 3 and an energy storage module, wherein the solar cell assembly 2, the solar controller, the bidirectional energy storage converter 3 and the energy storage module are integrally arranged in the cabin body, the bidirectional energy storage converter 3 comprises a single-phase inverter and a controller, the solar cell assembly 2 is of a foldable structure, the output end of the solar cell assembly 2 and the output end of the energy storage module are connected into a DC400V direct current bus, the DC400V direct current bus is electrically connected with the single-phase inverter and is used for converting DC400V direct current into AC230V alternating current to be output to an alternating current bus, the controller is used for connecting and controlling the energy storage module, an output port of the alternating current bus is provided with a grid-connected switch 7 and is used for controlling photovoltaic units to be operated in a grid-connected mode or operated in an off-grid mode, and a cascade interface 8 is further arranged for being connected with other power stations to be operated in a cascade mode. The cabin body adopts a container, so that the transportation is convenient.

The solar controller and the bidirectional energy storage converter 3 are integrated, and a photovoltaic inverse control all-in-one machine is adopted. The solar controller adopts an MPPT controller 4. The solar controller comprises an H-bridge DC/DC converter which is used for converting the voltage output by the solar cell module into DC400V and merging the DC400 into a direct current bus. The controller adopts a PI regulator.

The energy storage module comprises 12 500Wh standardized energy storage battery boxes 5 and an H-bridge DC/DC converter, wherein the H-bridge DC/DC converter is used for converting the voltage output by the 12 500Wh standardized energy storage battery boxes 5 into DC400V and incorporating the DC400V direct current bus into the DC.

Solar module 2 is including a plurality of flexible solar cell group cluster 21, and the integration is provided with a plurality of solar cell 211 on the solar cell group cluster 21, is connected with the hand-strap on the solar cell group cluster 21, and the solar cell group cluster 21 of being convenient for draws the transport under fold condition. The plurality of solar battery strings 21 are detachably spliced and electrically connected through the mutually matched plug-in components. The solar cell 211 employs an HDT heterojunction solar cell. The plug-in assembly adopts an aviation plug, and is convenient to install and disassemble. Solar cell group cluster 21 edge is provided with the magic subsides 212 that are used for with other solar cell group cluster 21 concatenations, magic subsides 212 interval sets up for form rectangular ventilation hole 213 between adjacent solar cell group cluster 21, solar cell group cluster 21 is gone up along length direction, the interval is provided with a plurality of circular ventilation holes 214 between adjacent solar cell 211. The outer side edge of the solar battery string 21 is provided with lugs 215 at intervals for connecting the weight 22. The solar cell modules 2 can be arranged according to the installed scale and the actual situation of the power station. In this embodiment, the installed capacity of the photovoltaic mobile power station is 3.2kW, 8 single 400W solar cell string are adopted, the solar cell module 2 is formed by connecting 8 solar cell string 21 in series, the folded size is not more than 640 x 520 x 55mm, each module weighs about 10Kg, and 8 single 400W solar cell string 21 is integrally provided with 8 solar cells 211. In the present embodiment, in actual use, the solar cell module 2 uses 4 solar cells as one group, and 2 groups in total. In order to reduce the influence of wind on the

solar cell module

2, 3 groups of weight blocks 22 are arranged on each side of the solar cell module 2 in the length direction of the outer sides of 4 solar cell modules in a group, each weight block 22 weighs about 10Kg to increase the wind resistance strength, and the solar cell module 2 can be successfully folded and unfolded under the condition of the wind speed of 20.7m/s (equivalent to 8-level wind). In addition, when the wind power generating device is actually used, the weight 22 is not needed to be configured when no wind exists or the wind power is relatively small according to the weather conditions, the construction amount is reduced under the condition that the normal operation of the device is guaranteed, and the weight is needed to be configured completely only under the working condition of the limit wind speed. When the solar cell module is unfolded and stored, two persons operate simultaneously, the time from taking out to unfolding of each solar cell module string 21 is about 15 seconds, and 60 seconds are required for each person to complete unfolding of 4 solar cell modules.

The container body 1 is a container, and an elastic shock absorption pad 6 for buffering shock is laid on the inner wall of the container body 1. The bidirectional energy storage converter 3 is provided with a heat radiation fan, the heat radiation fan adopts a mute fan controlled by variable frequency, and sound insulation baffles are arranged at the air inlet and the air outlet. Through reducing vibrations and noise to the propagation path of separation noise can realize photovoltaic mobile power station's silence stealthy function.

When the photovoltaic mobile power station capable of being operated in a grid-connected mode and an off-grid mode is used, the solar battery assemblies 2 are taken out of the cabin body 1, the solar battery assembly strings 21 are unfolded at set positions, the solar battery assembly strings 21 are spliced through the mutual matching of the magic tapes 212, the electrical connection among the solar battery assembly strings 21 is realized through the matching and splicing of the splicing assemblies after splicing, and then whether the weight blocks 22 are configured or not is selected according to actual needs, so that the unfolding operation of the solar battery assemblies is completed; the storage process is reversed.

The control method of the photovoltaic mobile power station capable of being operated on the grid and off the grid comprises the following steps:

referring to fig. 6, the solar cell module is controlled using a maximum power point tracking method. The maximum power output of the solar cell module is realized by controlling the port voltage Upv of the solar cell module to track the voltage value Um corresponding to the maximum power point. The maximum power point tracking control method comprises the following steps:

a) quickly finding out the voltage Um corresponding to the maximum power point through a maximum power point tracking algorithm, and ordering

The maximum power point tracking algorithm adopts the prior art;

b) realizing the reference value of the port voltage Upv of the solar battery component through closed-loop control

Dynamic tracking of (2). In order to ensure the stability of the control, the time scale of the latter control is smaller than that of the former control, i.e. waiting for Upv tracking during MPPT control

Then, the maximum power point tracking algorithm is called to update

c) And determining the direction of continuous optimization by judging the position relationship between the current working point and the maximum working point. Known from P ═ UI:

if it is

Namely, it is

Increasing the port voltage of the solar cell module to continue optimizing; otherwise, the port voltage of the solar cell module is reduced to continue optimizing.

Referring to fig. 7, the energy storage module controls the bidirectional energy storage converter by using a charging and discharging current-bus voltage droop control method. The output condition of each energy storage module is only related to the bus voltage, and the devices are independent and do not interfere with each other, so that the plug and play function and the parallel current sharing effect can be realized. And after the reference value of the bus voltage is determined according to the droop control method, carrying out closed-loop control on the bus voltage by adopting a double-loop control system of a direct-current bus voltage outer loop and an inductive current inner loop. The voltage outer ring is used for adjusting and stabilizing the voltage of the direct-current bus, and static error-free control can be achieved by adopting a PI (proportional integral) regulator. The current inner loop is introduced to improve the dynamic performance on one hand and to control the current without damaging the power electronics on the other hand, the inner loop also uses a PI regulator. In FIG. 8, U_dcIs a DC bus voltage, I_BFor charging and discharging current of energy storage battery, U_BFor charging and discharging voltage of energy-storage battery, U_{B_max}For reference value of charging and discharging voltage of energy storage battery, U_{dc_ref}Is a reference value of DC bus voltage, I_{B_max}For the maximum value of the charging and discharging current of the energy storage battery, I_{B_min}And the minimum value of the charge and discharge current of the energy storage battery is obtained.

When the energy storage unit is not used as a power balance node and the system has residual power, the energy storage battery module is charged if not saturated, so that enough electric quantity is ensured when the energy storage battery module is required to control the bus voltage.

When the terminal voltage of the energy storage battery module is smaller than a rated value, a charging current single closed loop is applied, and the controller is a control system of a PI regulator, so that constant current charging can be realized; after the terminal voltage reaches the rated voltage, the constant voltage charging can be realized by using a double closed-loop control system of the energy storage battery module terminal voltage outer loop and the charging current inner loop, and the controller adopts a PI (proportional integral) regulator because the voltage outer loop and the current inner loop are controlled by direct current. In order to avoid the overcharge of the energy storage battery module, when the SOC of the energy storage battery module reaches the upper limit, the charging of the energy storage battery module is stopped and the energy storage battery module enters an idle standby state, so that the safe operation of the energy storage battery module is ensured.

Referring to fig. 8, the single-phase inverter adopts a voltage outer loop, an inductance current inner loop and an instantaneous double closed-loop control strategy. The outer loop of the system is used for outputting instantaneous value feedback of filter capacitor voltage, the inner loop is used for outputting filter inductor current feedback, the outer loop voltage regulator adopts a proportional integral mode, and the inner loop current regulator adopts a proportional mode in order to enhance the dynamic performance of the system. Given reference signal U of voltage outer loop^refAnd an output voltage U₀The instantaneous error of the voltage PI regulator is processed to obtain a given signal I of a current inner loop^ref，I^refCompared with the instantaneous value of the inductive current, the deviation is regulated by a PI regulator and then is used as a modulation signal to be compared with a triangular carrier wave to obtain an SPWM driving signal.

The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.

Claims

1. The utility model provides a can be incorporated into the power networks and from photovoltaic mobile power station of net operation which characterized in that: including the cabin body and the integrated solar module, solar controller, two-way energy storage converter and the energy storage module that sets up in the cabin body, two-way energy storage converter is including single-phase dc-to-ac converter and controller, solar module is beta structure, and the direct current bus is incorporated into to solar module output and energy storage module output, and single-phase dc-to-ac converter is connected to the direct current bus electricity for convert the direct current into alternating current output to the alternating current bus, the controller is used for connecting and controlling energy storage module, and alternating current bus output port disposes the switch that is incorporated into the power networks for control photovoltaic unit is incorporated into the power networks or off-network operation.

2. The grid-connected and off-grid operational photovoltaic mobile power plant of claim 1, characterized in that: the solar controller comprises an H-bridge DC/DC converter, and is used for converting the voltage output by the solar cell module into DC400V and merging the DC400V into a direct current bus.

3. The grid-connected and off-grid operational photovoltaic mobile power plant of claim 1 or 2, characterized in that: the solar controller and the bidirectional energy storage converter are integrated, a photovoltaic inverse control all-in-one machine is adopted, the solar controller adopts an MPPT controller, and the controller adopts a PI regulator.

4. The grid-connected and off-grid operational photovoltaic mobile power plant of claim 1, characterized in that: the energy storage module comprises a plurality of energy storage batteries and an H-bridge DC/DC converter, wherein the H-bridge DC/DC converter is used for converting the voltage output by the energy storage batteries into DC400V and merging the DC400V into a DC bus.

5. The grid-connected and off-grid operational photovoltaic mobile power plant of claim 1, characterized in that: the solar cell module comprises a plurality of flexible solar cell module strings, a plurality of solar cells are integrally arranged on the solar cell module strings, the solar cell module strings are connected with a portable belt, the plurality of solar cell module strings are detachably spliced and are electrically connected through mutually matched plug-in components.

6. The grid-connected and off-grid operational photovoltaic mobile power plant of claim 5, characterized in that: solar cell group cluster edge is provided with the magic subsides that are used for with other solar cell group cluster concatenations, the magic is pasted the interval and is set up for form rectangular ventilation hole between the adjacent solar cell group cluster, solar cell group cluster is gone up along length direction, the interval is provided with a plurality of ventilation holes between adjacent solar cell.

7. The grid-connected and off-grid operational photovoltaic mobile power plant of claim 5 or 6, characterized in that: and hangers for connecting the heavy blocks are arranged at the outer edge of the solar battery pack string at intervals.

8. The grid-connected and off-grid operational photovoltaic mobile power plant of claim 5, characterized in that: the solar cell adopts an HDT heterojunction solar cell.

9. The grid-connected and off-grid operational photovoltaic mobile power plant of claim 1, characterized in that: the cabin body adopts a container, and an elastic shock pad for buffering vibration is laid on the inner wall of the cabin body.

10. The grid-connected and off-grid operational photovoltaic mobile power plant of claim 1, characterized in that: the bidirectional energy storage converter is provided with a cooling fan, the cooling fan adopts a mute fan which can be controlled by variable frequency, and sound insulation baffles are arranged at the air inlet and the air outlet.