CN108565951A - A kind of photovoltaic intelligent distribution system and method - Google Patents

Abstract

The invention belongs to photovoltaic system technical fields, more particularly to a kind of photovoltaic intelligent distribution system, the photovoltaic module ac converter is output in ac bus, the direct current supply of described ac bus one end is in load, the ac bus other end can be output in accumulator group with DC inversion, the accumulator group can also ac converter switching be output in ac bus, the present invention, which solves the problems, such as that the prior art exists, can not maximumlly utilize photovoltaic energy and realize stable Alternating Current Power Supply, photovoltaic energy is utilized with maximized, stability fundamental is provided for photovoltaic power supply, meet various power capacity demand, the advantageous effects flexibly expanded.

Description

A photovoltaic intelligent power distribution system and method

technical field

The invention belongs to the technical field of photovoltaic systems, in particular to a photovoltaic intelligent power distribution system.

Background technique

Domestic conventional off-grid photovoltaic systems generally generate DC power from photovoltaic modules, and then charge the battery pack through the charge and discharge controller. The power supply for the load is achieved by inverting the DC power of the battery into AC power through an off-grid inverter. The existing technology has the problem of not being able to maximize the use of photovoltaic energy and achieve a stable AC power supply.

Contents of the invention

The present invention provides a photovoltaic intelligent power distribution system to solve the problem in the above-mentioned background art that the prior art cannot maximize the use of photovoltaic energy and realize stable AC power supply.

The technical problem solved by the present invention is achieved by the following technical solutions: a photovoltaic intelligent power distribution system, including a photovoltaic module, the photovoltaic module AC inverter output to the AC bus, one end of the AC bus supplies DC power to the load, the The other end of the AC bus can be output to the battery pack through DC inversion, and the battery pack can also be output to the AC bus through AC inverter switching.

Further, the photovoltaic module is connected to the AC bus through the AC inverter output of the photovoltaic inverter, and the other end of the AC bus can be output to the battery pack through the DC inverter on one side of the bidirectional inverter, and the battery pack can also be The AC inverter switching output on the other side of the bidirectional inverter is on the AC bus.

Further, the intelligent power distribution system also includes a diesel generator, and the diesel generator is controlled by a bidirectional inverter to supply power and output to the bidirectional inverter.

Further, the bidirectional inverter has a built-in SUNNY remote controller, and the SUNNY remote controller controls the output to the diesel generator.

Furthermore, if the power supply load of the photovoltaic inverter is insufficient, the system will supply power to the load through the AC bus through the DC inverter switching of the battery pack.

Further, the photovoltaic module automatically controls the cooling system of the storage battery and the inverter container through the relay interface of its self-control function.

Further, the photovoltaic module is connected to the AC bus bar through the AC inverter output of the photovoltaic inverter to form a power generation inverter module. The battery pack can also be switched and output to the AC bus through the AC inverter on the other side of the bidirectional inverter to form an energy storage inverter module. Both the power generation inverter module and the energy storage inverter module can be modularly expanded in a container.

Furthermore, the AC busbar can also be connected to other power generation equipment, and the other power generation equipment includes diesel generators, wind power generators, heat exchangers, and water conservancy generators.

Furthermore, both the AC inverter switching and the diesel generator power supply switching adopt non-breakpoint switching.

At the same time, the present invention also provides a photovoltaic intelligent power distribution method, including building a photovoltaic intelligent power distribution system;

If the photovoltaic module has better sunlight, the photovoltaic inverter will invert the direct current converted by the solar energy into alternating current and supply power to the load through the alternating current bus, and charge the battery pack through the bidirectional inverter at the same time.

If the photovoltaic modules do not have good sunlight and the power supply load of the photovoltaic inverter is insufficient, the bidirectional inverter will automatically switch the battery pack to supply power through the AC bus, and at the same time, the battery pack and photovoltaic The inverters jointly supply power to the load through the AC bus.

Beneficial technical effects:

1. This patent adopts the AC inverter output of the photovoltaic module to the AC bus, one end of the AC bus supplies DC power to the load, and the other end of the AC bus can output DC inverter to the battery pack, and the battery pack can also be AC inverter The variable switching output is on the AC bus. Because it can communicate with the bidirectional inverter and realize the seamless switching between the intelligently controlled photovoltaic power supply and the diesel generator power supply, its working principle is that the photovoltaic square array converts the solar energy It is converted into DC power, and the DC power is converted into 400V AC power through a photovoltaic inverter. At this time, the load can be given priority to supply power, and the battery of the energy storage unit can also be charged through the bidirectional inverter at the same time. , powered by the energy storage unit. It can also realize that the photovoltaic inverter and the energy storage unit supply power to the load together, maximize the use of photovoltaic energy, and provide a stable basis for photovoltaic power supply.

2. This patent adopts that the intelligent power distribution system also includes a diesel generator, and the diesel generator is controlled by a bidirectional inverter to supply power and output to the bidirectional inverter. The bidirectional inverter has a built-in SUNNY remote controller, and the The SUNNY remote controller controls the output to the diesel generator. Because it can communicate with the bidirectional inverter, it can realize the seamless switching between the photovoltaic power supply and the diesel generator power supply under intelligent control. Equipped with expandable energy storage unit interface to meet various power capacity requirements.

3. This patent realizes common AC through AC bus technology, which can not only realize stable AC power supply, but also realize flexible expansion.

4. The patented photovoltaic inverter, the core component of the photovoltaic power generation system, is responsible for converting direct current into alternating current for use by alternating current loads. In order to improve the overall performance of the photovoltaic power generation system and ensure the long-term stable operation of the power station, the performance index of the inverter is very important. The bidirectional inverter is the core component of the energy storage system, which can charge the battery and also convert the DC power of the battery into Alternating current supplies power to loads, mainly large-capacity, high-performance battery packs, whose main task is to store energy so as to ensure load power consumption at night or in rainy days.

5. This patent uses the photovoltaic module to automatically control the heat dissipation system of the storage battery and the inverter container through the relay interface of its self-control function. In addition, the inverter module has powerful functions. The bi-directional inverter can automatically detect the voltage and current of the photovoltaic load, and together with the Sunny Tripower inverter, supply power to the load to ensure that the light is not abandoned in weak light conditions and maximize the use of photovoltaic energy. It is also equipped with an automatic control interface (relay interface), which can realize various automatic control functions. For example, the cooling system of the storage battery and inverter container can be automatically controlled through the relay interface.

6. In this patent, the photovoltaic module is connected to the AC busbar through the AC inverter output of the photovoltaic inverter to form a power generation inverter module. The other end of the AC busbar can be output to the battery pack through the DC inverter on one side of the bidirectional inverter. , the battery pack can also be switched and output to the AC bus through the AC inverter on the other side of the bidirectional inverter to form an energy storage inverter module, and both the power generation inverter module and the energy storage inverter module can be modularly expanded in a container , Since the power generation unit, inverter unit, and energy storage unit of this system all adopt modular design, the system construction is convenient and flexible. After the calculation of the system scheme is completed, the container-type module assembly can be realized, and a complete system can be quickly formed, which can reduce the design time of the scheme. In addition, the capacity of a single system can also be configured according to the customer's requirements, from the smallest 50KWp to the largest 225KWp, which is very flexible and can meet the electricity demand of various conditions. Most of the workload of electrical installation and civil construction shortens the construction period on site, and has the characteristics of fast, convenient and flexible.

7. There are few such container-type modular photovoltaic systems of this patent at home and abroad. Most of the systems are still designed first, and then the installation of various system equipment is carried out on site. More civil engineering is still required. The amount, the construction cost and the installation period are much larger than our system. This system greatly reduces the construction period through convenient installation.

8. The AC busbar used in this patent can also be connected to other power generation equipment, including diesel generators, wind power generators, heat exchangers, and water conservancy generators, so as to realize the expansion of flexible power generation types.

10. The patented photovoltaic system has stable performance and powerful functions, and its overall performance has reached the domestic advanced level. Among them, the Sunny Island bidirectional inverter not only has conventional and efficient rectification and inverter functions, but also has excellent seamless power switching functions. This function can realize the non-breakpoint switching between diesel generator or mains power and photovoltaic power supply, which greatly guarantees the stability of power supply. In China, only a few manufacturers of similar products with this function can realize it, and the price is expensive. Most domestic products still use dual power supply switches or contactors to achieve switching. This switching method has obvious mechanical actions. Once the switching fails, it is easy to cause short circuit of the switch or power failure of the equipment, which will affect the power supply.

11. This patent also provides a photovoltaic intelligent power distribution method. This method includes that if the photovoltaic module has good sunlight, the photovoltaic inverter will convert the direct current converted by the solar energy into alternating current and supply power to the load preferentially through the alternating current bus. At the same time, the battery pack is charged through the bidirectional inverter; if the photovoltaic module does not have good sunlight and the power supply load of the photovoltaic inverter is insufficient, the bidirectional inverter automatically switches the battery pack to supply power through the AC bus, and can also be powered by the battery pack The photovoltaic module supplies power to the load through the AC bus through the bidirectional inverter and the photovoltaic inverter respectively. Through this method, the photovoltaic inverter and the energy storage unit jointly supply power to the load, maximize the use of photovoltaic energy, and provide photovoltaic power supply. established a stable foundation.

Description of drawings

Fig. 1 is a structural schematic diagram of a photovoltaic intelligent power distribution system of the present invention;

Fig. 2 is a schematic diagram of the extended structure of the power generation equipment of a photovoltaic intelligent power distribution system of the present invention;

Fig. 3 is a schematic diagram of a power supply switching structure of a photovoltaic intelligent power distribution system of the present invention;

Fig. 4 is a flowchart of a photovoltaic intelligent power distribution method according to the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

In the picture:

1-Photovoltaic module, 2-AC busbar, 3-load, 4-battery pack, 5-photovoltaic inverter, 6-bidirectional inverter, 7-diesel generator, 8-SUNNY remote controller, 9-wind power generation Machine, 10-heat exchanger, 11-hydraulic generator;

S101-If the photovoltaic module has better sunlight;

S102-Photovoltaic inverter converts the direct current converted by solar energy into alternating current and supplies power to the load through the AC bus first;

S103-Charge the battery pack through the bidirectional inverter at the same time;

S104-If the photovoltaic module does not have good sunlight and the power supply load of the photovoltaic inverter is insufficient;

S105-bidirectional inverter automatically switches the battery pack to supply power through the AC bus;

S106-At the same time, the battery pack and the photovoltaic module can also supply power to the load through the AC bus through the bidirectional inverter and the photovoltaic inverter respectively.

Example:

This embodiment: as shown in Figure 1, a photovoltaic intelligent power distribution system includes a photovoltaic module 1, the AC inverter output of the photovoltaic module 1 is on the AC bus 2, and one end of the AC bus 2 supplies DC power to the load 3, so The other end of the AC bus 2 can be output to the battery pack 4 through DC inversion, and the battery pack 4 can also be output to the AC bus 2 through AC inverter switching.

Since the photovoltaic module is used for AC inverter output to the AC bus, one end of the AC bus supplies DC power to the load, and the other end of the AC bus can be DC inverted and output to the battery pack, and the battery pack can also be switched for AC inverter output. Based on the AC bus, because it can communicate with the bidirectional inverter and realize the seamless switching between the intelligently controlled photovoltaic power supply and the diesel generator power supply, its working principle is that the photovoltaic square array converts solar energy into DC power in the case of better sunlight. It can convert direct current into 400V alternating current through photovoltaic inverter. At this time, the load can be given priority to supply power, and the battery of the energy storage unit can also be charged through the bidirectional inverter at the same time. , powered by the energy storage unit. It can also realize that the photovoltaic inverter and the energy storage unit supply power to the load together, maximize the use of photovoltaic energy, and provide a stable basis for photovoltaic power supply.

The photovoltaic module 1 is connected to the AC bus 2 through the AC inverter output of the photovoltaic inverter 5, and the other end of the AC bus 2 can be output to the battery pack 4 through the DC inverter on one side of the bidirectional inverter 6. The battery The group 4 can also be switched and output to the AC bus 2 via the AC inverter on the other side of the bidirectional inverter 6 .

Because of the common AC through the AC bus technology, not only stable AC power supply can be realized, but also flexible expansion can be realized.

As shown in FIG. 3 , the intelligent power distribution system further includes a diesel generator 7 , and the diesel generator 7 is controlled by the bidirectional inverter 6 to supply power and output to the bidirectional inverter 6 .

The bidirectional inverter 6 has a built-in SUNNY remote controller 8, and the SUNNY remote controller 8 controls the output to the diesel generator 7.

Since the intelligent power distribution system also includes a diesel generator, the diesel generator is controlled by a bidirectional inverter to supply power and output to the bidirectional inverter. The bidirectional inverter has a built-in SUNNY remote controller, and the SUNNY remote control The inverter control output is on the diesel generator, because it can communicate with the bidirectional inverter, and realize the seamless switching between the intelligent control photovoltaic power supply and the diesel generator power supply. Equipped with expandable energy storage unit interface to meet various power capacity requirements.

If the power supply load of the photovoltaic inverter 5 is insufficient, the system supplies power to the load 3 via the AC bus 2 through the DC inverter switching of the battery pack 4 .

Since the photovoltaic inverter, the core component of the photovoltaic power generation system, is responsible for converting direct current into alternating current for use by alternating current loads. In order to improve the overall performance of the photovoltaic power generation system and ensure the long-term stable operation of the power station, the performance index of the inverter is very important. The bidirectional inverter is the core component of the energy storage system, which can charge the battery and also convert the DC power of the battery into Alternating current supplies power to loads, mainly large-capacity, high-performance battery packs, whose main task is to store energy so as to ensure load power consumption at night or in rainy days.

The photovoltaic module 1 automatically controls the heat dissipation system of the storage battery and the inverter container through the relay interface of its self-control function.

Since the photovoltaic module is used to automatically control the heat dissipation system of the storage battery and the inverter container through the relay interface of its self-control function, in addition, the function of the inverter module is powerful. The bi-directional inverter can automatically detect the voltage and current of the photovoltaic load, and together with the Sunny Tripower inverter, supply power to the load to ensure that the light is not abandoned in weak light conditions and maximize the use of photovoltaic energy. It is also equipped with an automatic control interface (relay interface), which can realize various automatic control functions. For example, the cooling system of the storage battery and inverter container can be automatically controlled through the relay interface.

The photovoltaic module 1 is connected to the AC bus 2 via the AC inverter output of the photovoltaic inverter 5 to form a power generation inverter module. 4. The battery pack 4 can also be output to the AC bus 2 through the AC inverter switching on the other side of the bidirectional inverter 6 to form an energy storage inverter module. Both the power generation inverter module and the energy storage inverter module can be containerized modular expansion.

Since the photovoltaic module is connected to the AC bus bar through the AC inverter output of the photovoltaic inverter to form a power generation inverter module, the other end of the AC bus bar can be output to the battery pack through the DC inverter on one side of the bidirectional inverter. The battery pack can also be switched and output to the AC bus through the AC inverter on the other side of the bidirectional inverter to form an energy storage inverter module. Both the power generation inverter module and the energy storage inverter module can be expanded modularly in a container. The power generation unit, inverter unit, and energy storage unit of the system all adopt modular design, and the system construction is convenient and flexible. After the calculation of the system scheme is completed, the container-type module assembly can be realized, and a complete system can be quickly formed, which can reduce the design time of the scheme. In addition, the capacity of a single system can also be configured according to the customer's requirements, from the smallest 50KWp to the largest 225KWp, which is very flexible and can meet the electricity demand of various conditions. Most of the workload of electrical installation and civil construction shortens the construction period on site, and has the characteristics of fast, convenient and flexible.

There are few such container-type modular photovoltaic systems at home and abroad. Most of the systems are still designed first, and then the installation of various system equipment is carried out on site, which still requires a lot of civil engineering. The cost and installation period are much larger than our system. The convenient installation of this system greatly reduces the construction period.

As shown in FIG. 2 , the AC bus 2 can also be connected to other power generation equipment, and the other power generation equipment includes a diesel generator 7 , a wind power generator 9 , a heat exchanger 10 , and a water conservancy generator 11 .

Since the AC bus can also be connected to other power generation equipment, the other power generation equipment includes diesel generators, wind power generators, heat exchangers, and water conservancy generators, so as to realize flexible expansion of power generation types.

Both the switching of the AC inverter and the switching of the power supply of the diesel generator 7 adopt non-breakpoint switching.

Due to the stable performance and powerful functions of the photovoltaic system, the overall performance has reached the domestic advanced level. Among them, the SunnyIsland bidirectional inverter not only has conventional and efficient rectification and inverter functions, but also has excellent seamless power switching functions. This function can realize the non-breakpoint switching between diesel generator or mains power and photovoltaic power supply, which greatly guarantees the stability of power supply. In China, only a few manufacturers of similar products with this function can realize it, and the price is expensive. Most domestic products still use dual power supply switches or contactors to achieve switching. This switching method has obvious mechanical actions. Once the switching fails, it is easy to cause short circuit of the switch or power failure of the equipment, which will affect the power supply.

At the same time, the present invention also provides a photovoltaic intelligent power distribution method, as shown in Figure 4, including constructing a photovoltaic intelligent power distribution system including claims 1-9;

If the photovoltaic module 1 has better sunlight S101, the photovoltaic inverter 5 inverts the direct current converted from the solar energy into alternating current through the AC bus 2 to give priority to power supply for the load 3 S102, and at the same time supplies power to the battery pack 4 through the bidirectional inverter 6 Charge the S103.

If the photovoltaic module 1 has no good light and the power supply load of the photovoltaic inverter 5 is insufficient S104, the bidirectional inverter 6 automatically switches the battery pack 4 to supply power through the AC bus 2 S105, and at the same time, the battery pack 4 and the photovoltaic module 1 supplying power to the load 3 via the bidirectional inverter 6 and the photovoltaic inverter 5 through the AC bus 2 respectively S106.

Because, at the same time, a photovoltaic intelligent power distribution method is provided. The method includes that if the photovoltaic module has better sunlight, the photovoltaic inverter converts the direct current converted from the solar energy into alternating current and supplies power to the load through the alternating current bus firstly. At the same time, through the The bidirectional inverter charges the battery pack; if the photovoltaic module does not have good sunlight and the power supply load of the photovoltaic inverter is insufficient, the bidirectional inverter automatically switches the battery pack to supply power through the AC bus, and at the same time, the battery pack and the photovoltaic The components supply power to the load through the bidirectional inverter and the photovoltaic inverter through the AC bus. Through this method, the photovoltaic inverter and the energy storage unit supply power to the load together, maximize the use of photovoltaic energy, and provide stable photovoltaic power supply. Base.

working principle:

In this patent, the AC inverter output of the photovoltaic module is output to the AC bus, and one end of the AC bus supplies DC power to the load, and the other end of the AC bus can be DC inverted and output to the battery pack, and the battery pack can also be switched by AC inverter. The output is on the AC bus, because it can communicate with the bidirectional inverter and realize the seamless switching between the intelligently controlled photovoltaic power supply and the diesel generator power supply. Its working principle is that the photovoltaic square array converts solar energy into The DC power is converted into 400V AC by the photovoltaic inverter. At this time, the load can be given priority to supply power, and the battery of the energy storage unit can also be charged through the bidirectional inverter at the same time. , powered by the energy storage unit. It can also realize that the photovoltaic inverter and the energy storage unit supply power to the load together. The present invention solves the problem that the prior art cannot maximize the use of photovoltaic energy and realize stable AC power supply, and has the maximum utilization of photovoltaic energy. The power supply provides beneficial technical effects of stable foundation, satisfying diverse power capacity demands, and flexible expansion.

Utilize the technical solution of the present invention, or those skilled in the art design similar technical solutions under the inspiration of the technical solution of the present invention, and achieve the above-mentioned technical effects, all fall into the protection scope of the present invention.

Claims (10)

1. a kind of photovoltaic intelligent distribution system, which is characterized in that including photovoltaic module, the photovoltaic module ac converter is output in Ac bus, the direct current supply of described ac bus one end can be output in load, the ac bus other end with DC inversion Accumulator group, the accumulator group can also ac converter switching be output in ac bus.

2. a kind of photovoltaic intelligent distribution system according to claim 1, which is characterized in that the photovoltaic module is inverse through photovoltaic The ac converter output for becoming device is connected to ac bus, and the ac bus other end can be inverse through two-way inverter side direct current Change is output in accumulator group, and the accumulator group can also switch through two-way inverter other side ac converter is output in exchange mother Line.

3. a kind of photovoltaic intelligent distribution system according to claim 2, which is characterized in that the intelligent distribution system also wraps Diesel-driven generator is included, the diesel-driven generator is output in two-way inverter through the power supply of two-way inverter control.

4. a kind of photovoltaic intelligent distribution system according to claim 3, which is characterized in that built in the two-way inverter SUNNY remote controllers, the SUNNY remote controllers control are output in diesel-driven generator.

5. a kind of photovoltaic intelligent distribution system according to claim 1, which is characterized in that if photovoltaic DC-to-AC converter supply load Deficiency, then system is switched by accumulator group DC inversion is powered at load through ac bus.

6. a kind of photovoltaic intelligent distribution system according to claim 4, which is characterized in that the photovoltaic module by its from The relay interfaces of control function automatically control the cooling system of accumulator and inverter container.

7. a kind of photovoltaic intelligent distribution system according to claim 2, which is characterized in that the photovoltaic module is inverse through photovoltaic The ac converter output for becoming device is connected to ac bus formation power-generation inversion module, and the ac bus other end can be through two-way Inverter side DC inversion is output in accumulator group, and the accumulator group can also be through two-way inverter other side ac converter Switching is output in ac bus and forms energy storage inverter module, and the power-generation inversion module and energy storage inverter module can be with containers The modularization of formula extends.

8. a kind of photovoltaic intelligent distribution system according to claim 4, which is characterized in that the ac bus also can access Other generating equipments, other described generating equipments include diesel-driven generator, wind-driven generator, heat exchanger, water conservancy generator.

9. a kind of photovoltaic intelligent distribution system according to claim 8, which is characterized in that the ac converter switching and bavin Fry dried food ingredients motor power switching is all made of no breakpoint switching.

10. a kind of photovoltaic intelligent distribution method, which is characterized in that including structure include light such as claim 1- claims 9 Lie prostrate intelligent distribution system；

If in the case that photovoltaic module has preferable illumination, the DC inverter that photovoltaic DC-to-AC converter converts solar energy is at alternating current It is preferably load supplying by ac bus, while by two-way inverter to battery charging；

If in the case that photovoltaic module is without preferable illumination and photovoltaic DC-to-AC converter supply load is insufficient, two-way inverter automatically switches Accumulator group is powered through ac bus, while can also be by accumulator group and photovoltaic module respectively through two-way inverter and photovoltaic Inverter powers to the load commonly through ac bus.