CN203326693U - Novel photovoltaic refrigerator - Google Patents

Abstract

The utility model relates to a novel photovoltaic refrigerator which is jointly powered by solar energy and commercial power and has a frequency conversion starting function. When the solar radiation is sufficient, the power generated by the solar panels charges the battery in the UPS inverter power supply, and then realizes DC/AC conversion through the inverter circuit, and then drives the compressor of the refrigerator to work after being modulated by the inverter starter to achieve refrigeration. Excess electrical energy is stored in the battery. When the solar radiation is insufficient, the electric energy in the storage battery is used first, and when it is insufficient, it is provided by the grid. The mains electricity is charged by the AC/DC conversion circuit for the storage battery, and then converted into alternating current by the inverter circuit after the control circuit and modulated by the variable frequency starter. Drive the refrigerator to run. Combined power supply of solar energy and mains power The solar priority power supply mode not only maximizes the use of clean energy generated by solar panels, but also reduces the configuration capacity and cost of the system battery, and also solves the stability problem of the system when the irradiation is insufficient. The efficiency and applicability of the system are improved.

Description

A new photovoltaic refrigerator

technical field

The utility model relates to a novel photovoltaic refrigerator which is jointly powered by solar energy and commercial power and has a frequency conversion starting function, and belongs to the technical field of photovoltaic refrigerators. the

Background technique

my country is a big country in the production of refrigerators and a big country in the use of refrigerators. According to statistics, in 2007, the annual output of refrigerators in my country was 43.9713 million units, of which 10.6478 million units were freezers; the export value of refrigerators was 4.179 billion US dollars, a year-on-year increase of 31% compared with 2008, and the export volume accounted for the largest share of household appliances exports. 12% of the total. In 2008, my country's refrigerator production was nearly 50 million units. While refrigerators bring convenience to people's lives, they consume a large amount of power resources and cause more and more serious pollution to the environment. the

With the consumption of non-renewable energy such as oil, coal, and natural gas, environmental problems and energy shortages are becoming more and more severe. People are gradually turning their attention to the utilization of renewable energy such as wind energy, water energy, biomass energy, and solar energy. Solar energy is the most widely used energy among them. It is clean and safe, and it is an environmentally friendly energy widely promoted around the world. In addition, many remote areas and nomadic areas in China are unable to use refrigerators to preserve food and necessary sanitary vaccine supplies due to lack of electricity, which brings great inconvenience to their production and life. However, most of these areas are located in areas rich in solar energy resources, which lays the foundation for the application and promotion of solar photovoltaic refrigerators. the

Solar photovoltaic refrigerators use solar energy as the power source of the system, clean and pollution-free, reduce the use of electricity, and help to solve the increasingly serious energy crisis caused by the depletion of non-renewable energy. Household refrigerators are the electrical appliances that consume the most electricity in households, and 33% of the total electricity consumption in households is consumed by refrigerators. A refrigerator consumes energy from the day it is purchased until it is scrapped. In addition, many remote areas and nomadic peoples in China have no power supply network so far, and they cannot use refrigerators to preserve food. These will provide a potential market for the development of solar refrigerators. Based on these backgrounds, people have a strong interest in solar photovoltaic refrigerator technology.

The traditional photovoltaic refrigerator system consists of battery components, controllers, storage batteries, inverters and refrigerators. At present, the practicality of solar photovoltaic refrigerators is still relatively low. The main constraints are that the system is greatly affected by weather conditions, and it is difficult to achieve stable operation in continuous rainy weather; the initial investment of system components such as batteries is relatively high, in order to store the system for a period of time. Electric energy requires a large battery capacity, which will greatly increase the initial investment cost of the system: the refrigerator is an inductive load, and its start-up requires 6-10 units of instantaneous start-up power. For a photovoltaic refrigerator without frequency conversion start, it needs Configuring a large inverter capacity will also increase the initial investment cost of the system, and frequent start-up power will cause damage to components and components, reducing the service life of the inverter; the selected system components are not highly integrated , each component is not placed in a suitable position, which affects the aesthetics, safety and reliability of the system.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings of the existing photovoltaic refrigerator system, and propose a new type of photovoltaic refrigerator which is jointly powered by solar energy and mains power and has the function of starting with frequency conversion. Combined power supply of solar energy and mains power The solar priority power supply mode not only maximizes the use of clean energy generated by solar panels, but also reduces the configuration capacity of the system battery and reduces system costs. It also solves the problem of the stability of the photovoltaic refrigerator system when there is insufficient light. It improves the efficiency and applicability of the system. The variable frequency start function can effectively protect the safety of components and reduce the configuration capacity of the inverter. Integrating various components on the back of the refrigerator improves the degree of system integration, improves the integrity of the system, and makes the system beautiful and reliable. the

The utility model is completed through the following technical solutions: a novel photovoltaic refrigerator with solar energy priority power supply is composed of a solar panel, a mains power grid, a UPS inverter power supply, an AC variable frequency starter and an AC refrigerator. Both the solar panel and the utility grid are connected to the power input end of the UPS inverter, the variable frequency starter is connected to the output end of the UPS inverter power supply, and the other end of the variable frequency starter is connected to the AC refrigerator.

The UPS inverter power supply includes an AC/DC conversion circuit, an inverter circuit, a storage battery, and a control circuit.

The solar panel is connected to the input end of the UPS inverter power supply; the mains power grid is connected to the input end of the storage battery through the AC/DC conversion circuit through the control circuit, and the input end of the inverter circuit is connected to the storage battery through the control circuit, and the inverter The other end of the circuit is connected with the AC refrigerator through the AC variable frequency starter.

The joint power supply of solar panels and the mains power grid is realized through the UPS inverter power supply; the soft start of the refrigerator is realized by adding an AC variable frequency starter between the inverter circuit and the AC refrigerator; the UPS inverter power supply and the AC variable frequency start The inverter is integrated in the back of the AC refrigerator.

It can be replaced by another form: DC system. At this time, the system is composed of solar panels, controllers, batteries, DC variable frequency starters and DC refrigerators. When the sun is irradiated sufficiently, the solar panels generate DC, and the DC passes through the controller. The DC variable frequency starter drives the DC refrigerator to work, and the excess electric energy charges the battery; when the irradiation is insufficient or there is no irradiation, the system is powered by the battery.

Another form in the refrigerator described in the system is: the AC compressor is replaced by a DC compressor. At this time, the UPS inverter power supply is omitted, and the system correspondingly adds a storage battery and an MPPT controller.

Another form of the refrigerator system described in the system is: the storage battery is omitted, and the corresponding UPS inverter power supply is replaced by an inverter, which is not connected to the mains grid, so as to reduce the system cost and the initial investment of the system.

Working principle: The sun's rays are incident on the solar panel to generate DC power, which is stored in the battery part of the UPS inverter power supply. The DC power in the battery is converted into AC power by the inverter circuit, and the AC power is modulated by the frequency converter. Voltage and current Realize the variable frequency drive of the AC refrigerator. When the solar radiation is insufficient, the UPS inverter power supply is connected to the mains power grid, and the mains power is sent to the battery for energy storage after passing through the AC/DC conversion circuit in the UPS inverter power supply, and the DC power stored in the battery is passed through the inverter. After that, it is converted into alternating current, and the alternating current is modulated by a frequency converter to drive the AC refrigerator to work.

Compared with the prior art, the present invention has the following advantages:

1. The system provides electric energy for AC loads, which is suitable for refrigerator refrigeration in most households, and has strong applicability. The battery in the system realizes the "peak shifting and valley filling" of the electric energy of solar panels.

2. The system realizes the combined power supply of solar energy and mains electricity through UPS inverter power supply. The system is connected to the solar panel circuit first, and uses the DC power generated by the solar panel to improve the utilization efficiency of clean energy. When the power generated by the solar panels is insufficient, it is connected to the mains grid, and the mains is used as the power source of the system to ensure the stable operation of the system. The joint power supply mode of solar energy and mains power can make the configuration of the storage battery in the system properly reduced, which satisfies the stable operation of the system and reduces the cost at the same time.

3. The use of the variable frequency starter realizes the soft start of the refrigerator, protects the safety of components, and reduces the capacity requirements of the inverter and battery in the system.

4. The storage battery can be omitted in the system, which reduces the system cost.

5. The UPS inverter power supply and variable frequency starter are integrated inside the back of the refrigerator, which improves the degree of system integration and makes the system beautiful, safe and reliable.

6. The DC refrigerator system reduces the inverter loss, and the frequency conversion start can also realize the protection circuit, energy saving and other functions.

Description of drawings

Figure 1 is a schematic structural diagram of the AC photovoltaic refrigerator system in Example 1. the

Fig. 2 is a schematic structural diagram of the DC photovoltaic refrigerator system in Embodiment 2.

Figure 3 is a schematic diagram of the internal structure of the AC photovoltaic refrigerator in Example 1.

Figure 4 is a schematic diagram of the internal structure of the DC photovoltaic refrigerator in Example 2.

In the figure 1. Solar panel, 2. Mains power grid, 3. UPS inverter power supply, 4. AC/DC conversion circuit, 5. Inverter circuit, 6. Battery, 7. Control circuit, 8. AC variable frequency starter , 9. AC refrigerator, 10. Controller, 11. DC variable frequency starter, 12. DC refrigerator.

Detailed ways

A new type of photovoltaic refrigerator consists of solar panels (1), mains power grid (2), UPS inverter power supply (3) (including AC/DC conversion circuit (4), inverter circuit (5), battery (6) , control circuit (7)), AC variable frequency starter (8) and AC refrigerator (9). The solar panel (1) is connected to the input terminal of the battery (6) in the UPS inverter power supply (3), and the mains power grid (2) is connected to the battery (6) through the AC/DC conversion circuit (4) through the control circuit (7) The input terminal is connected, the input terminal of the inverter circuit (5) is connected with the storage battery (6) through the control circuit (7), and the other end of the inverter circuit (5) is connected with the AC refrigerator (9) through the AC variable frequency starter (8). )connect. the

The utility model system will be further described below in conjunction with the accompanying drawings and embodiments.

Example 1

As shown in Figure 1, it is an embodiment of the present utility model. The system is mainly started by solar panels (1), UPS inverter power supply (3) (including AC/DC conversion circuit (4), inverter circuit (5), battery (6), control circuit (7)), AC frequency conversion device (8), and AC refrigerator (9). When the sunlight is sufficient, the solar panel (1) is connected to the battery (6) in the UPS inverter power supply (3), and the other end of the battery (6) is connected to the inverter circuit (5) via the control circuit (7) The other end of the inverter circuit (5) is connected with the AC refrigerator (9) via the AC variable frequency starter (8). After the sun's rays irradiate the solar panel (1), the solar panel (1) converts solar energy into DC power, and the battery component reaches the appropriate battery charging voltage to charge the battery (6) in the UPS inverter power supply (3). The electric energy of the storage battery (6) is converted by the inverter circuit (5) into DC/AC and then modulated by the frequency converter to drive the compressor of the refrigerator to work to realize refrigeration of the refrigerator. When the solar irradiance is insufficient, the working power of the mains power grid (2) is converted into direct current through the AC/DC conversion circuit (4), and the direct current charges the battery (6), and the electric energy in the battery (6) is After the control circuit (7), the inverter circuit (5) converts it into alternating current and drives the load of the refrigerator to run after being modulated by the variable frequency starter. The combined power supply of solar energy and mains power supply with priority to solar energy not only maximizes the use of clean energy generated by solar panels Energy, and reduce the configuration capacity of the system battery, reduce the system cost, but also solve the problem of the stability of the photovoltaic refrigerator system when the light is insufficient, and improve the system efficiency and applicability. The variable frequency start function can effectively protect the safety of components and reduce the configuration capacity of the inverter. At the same time, all components are integrated on the back of the refrigerator, which improves the degree of system integration and makes the system structure simple and beautiful, safe and reliable.

Example 2

As shown in Figure 2, it is an embodiment of the present utility model. The system is mainly composed of a solar panel (1), a controller (10), a storage battery (6), a DC variable frequency starter (11) and a DC refrigerator (12). When the sun is irradiated, the solar panel (1) generates DC power, and the DC power passes through the controller (10) and then the DC variable frequency starter (11) to drive the DC refrigerator (12) to work, and the excess power is given to the battery (6) Charging to power the system when irradiance is insufficient. The DC variable frequency starter realizes the energy saving of the system by modulating the appropriate frequency.

Claims (3)

1. a Novel photovoltaic refrigerator, it is characterized in that: comprise solar panel (1), utility grid (2), UPS inverter (3), AC frequency conversion starter (8), exchange refrigerator (9), described solar panel (1) is connected with UPS inverter (3) input; Described utility grid (2) is connected with storage battery (6) input by control circuit (7) through AC/DC change-over circuit (4), the input of inverter circuit (5) is connected with storage battery (6) through control circuit (7), and the other end of inverter circuit (5) is connected with interchange refrigerator (9) by AC frequency conversion starter (8).

2. a kind of Novel photovoltaic refrigerator according to claim 1, is characterized in that: the electric energy alliance of realizing solar panel (1) and utility grid (2) by UPS inverter (3); By between inverter circuit (5) and interchange refrigerator (9), increasing the soft start that an AC frequency conversion starter (8) is realized refrigerator; Described UPS inverter (3) and AC frequency conversion starter (8) integrating are exchanging refrigerator (9) inside, the back side.

3. a kind of Novel photovoltaic refrigerator according to claim 1, it is characterized in that: can change another kind of form into: direct current system, now system is comprised of solar panel (1), controller (10), storage battery (6), DC frequency-changing starter (11) and DC refrigerator (12), when solar irradiation is sufficient, solar panel (1) produces direct current, direct current via controller (10) is by DC frequency-changing starter (11) rear drive DC refrigerator (12) work, and unnecessary electric energy accumulators (6) charges; When irradiation is not enough or there is no irradiation, system is by storage battery (6) power supply.

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