CN209626974U - Low-voltage photovoltaic compensation device at the end of distribution network - Google Patents

Abstract

The utility model relates to the photovoltaic application technical fields at low-voltage scene, it is a kind of power distribution network end low-voltage photovoltaic compensation device, it includes household power system, photovoltaic battery panel and the photovoltaic conversion unit that the direct current that photovoltaic panel generates can be converted to mains frequency alternating current, photovoltaic battery panel is electrically connected with photovoltaic conversion unit, photovoltaic conversion unit is connected in household power system, the direct current that photovoltaic panel generates is converted to the alternating current of mains frequency by photovoltaic conversion unit, and electricity output will be exchanged into household power system, by the voltage compensation of domestic loads interface in household power system to 220V.The utility model is structurally reasonable, it is easy to use, it solves in household power system, alternating current can generate pressure drop when transmitting through long distance transmission line, so as to cause the problem of power distribution network terminal voltage reduces, influences family's normal electricity consumption, by the way that photovoltaic conversion unit is connected in household power system, notch voltage is compensated, so that the voltage of domestic loads interface is reached 220V, to guarantee the normal use of household appliances.

Description

Low-voltage photovoltaic compensation device at the end of distribution network

technical field

The utility model relates to the technical field of photovoltaic application at low-voltage sites, and relates to a low-voltage photovoltaic compensation device at the end of a distribution network.

Background technique

With the development of the economy, the use of home appliances has become more and more common, and many home appliances have put forward higher requirements for power quality. However, in many remote villages in China, because the power supply radius of the distribution network is too long, some are even tens of kilometers away, the quality of power supply in these remote areas is very poor, and some voltages are as low as 150V, and many home appliances cannot be used. It has had a serious impact on people's lives. In some areas, distributed photovoltaic power supply is used instead of long-distance mains power supply to solve the problem of electricity consumption in remote areas. Because photovoltaics only generate electricity during the day, they will be wasted if not used, and there will be a phenomenon of light abandonment. Therefore, many distributed photovoltaics are equipped with batteries to store electric energy for use on cloudy days or at night. Since the investment in distributed photovoltaics is generally small, the light intensity in many places is limited, and the energy stored during the day is not enough to be used at night or on cloudy days.

Contents of the invention

The utility model provides a low-voltage photovoltaic compensation device at the end of a distribution network, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of the remote area existing in the prior art due to the power supply distance of the distribution network being too far away, resulting in the voltage at the end of the power grid. Low, affecting the normal household electricity consumption.

The technical solution of the utility model is achieved by the following measures: a low-voltage photovoltaic compensation device at the end of a distribution network, including a household power grid, a photovoltaic battery panel, and a photovoltaic converter capable of converting the direct current generated by the photovoltaic panel into alternating current at the mains frequency unit, the photovoltaic cell panel is electrically connected to the photovoltaic conversion unit, and the photovoltaic conversion unit is connected in series in the household power grid. The voltage of the household load interface in the household grid is compensated to 220V.

Below is the further optimization or/and improvement to above-mentioned utility model technical scheme:

The foregoing may also include a storage battery, and the storage battery is electrically connected to the photovoltaic battery panel and the photovoltaic conversion unit, respectively.

The above-mentioned photovoltaic conversion unit may be a photovoltaic inverter.

The household power grid mentioned above may include city power, long-distance power transmission lines and home appliance loads, and the city power is connected to home appliance loads through long-distance power transmission lines.

The utility model is simple in structure and easy to use, and solves the problem that in the household power grid, when the city power is transmitted through a long-distance transmission line, a voltage drop will occur, which will cause a voltage drop at the end of the distribution network and affect the normal power consumption of the family. The photovoltaic conversion unit is connected in series in the household grid to compensate for the gap voltage, so that the voltage of the household load interface reaches 220V, thus ensuring the normal use of the household load.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the circuit structure of the best embodiment of the utility model.

Detailed ways

The utility model is not limited by the following examples, and the specific implementation manner can be determined according to the technical scheme of the utility model and actual conditions.

Below in conjunction with embodiment and accompanying drawing, the utility model is further described:

As shown in Figure 1, the low-voltage photovoltaic compensation device at the end of the distribution network includes a household power grid, a photovoltaic panel, and a photovoltaic conversion unit that can convert the direct current generated by the photovoltaic panel into alternating current at the mains frequency. The photovoltaic conversion unit is electrically connected, and the photovoltaic conversion unit is connected in series in the household grid. The photovoltaic conversion unit converts the direct current generated by the photovoltaic panel into the alternating current of the mains frequency, and outputs the alternating current to the household grid, and converts the voltage of the household load interface in the household grid to Compensated to 220V.

The above-mentioned photovoltaic conversion unit is connected in series in the household power grid. During operation, the photovoltaic conversion unit converts the direct current generated by the photovoltaic panel into alternating current of the mains frequency, and outputs the alternating current to the household power grid to compensate for the gap voltage, and converts the household load interface in the household power grid Voltage compensation to 220V. When the power grid is out of power, the DC power generated by the photovoltaic panel can also be directly converted into AC power at the mains frequency through the photovoltaic conversion unit to supply power for household loads.

Therefore, the utility model is simple in structure and easy to use, and solves the problem that in the household power grid, when the mains power is transmitted through a long-distance transmission line, a voltage drop will occur, which will cause a voltage drop at the end of the distribution network and affect the normal power consumption of the family. Connect the photovoltaic conversion unit in series to the household power grid to compensate the gap voltage so that the voltage of the household load interface reaches 220V, thus ensuring the normal use of the household load. At the same time, in general, the photovoltaic conversion unit of the utility model only needs to perform terminal voltage compensation for the household power grid, thus effectively reducing the power of the photovoltaic conversion unit and increasing the service life of the photovoltaic conversion unit.

According to actual needs, the above low-voltage photovoltaic compensation device at the end of the distribution network can be further optimized or/and improved:

As shown in FIG. 1 , a storage battery is also included, and the storage battery is electrically connected to the photovoltaic battery panel and the photovoltaic conversion unit respectively.

The above-mentioned battery can be used to store electric energy;

Under the condition of normal light, the photovoltaic panel provides electric energy to the photovoltaic conversion unit. If the terminal voltage of the household grid is 150V, the photovoltaic conversion unit outputs a voltage of 70V to the household grid for voltage compensation, and at the same time, the other electric energy of the photovoltaic panel is stored in battery.

In the absence of light, the storage battery provides power to the photovoltaic conversion unit. If the terminal voltage in the household grid is 150V, the photovoltaic conversion unit outputs a voltage of 70V to the household grid for voltage compensation.

The above-mentioned addition of storage battery ensures that the utility model can also normally perform voltage compensation for the household power grid under the condition of no light, further ensuring the voltage stability of the household power grid; at the same time, the battery only needs to bear part of the household load power or In special cases, it bears all the household load power, which greatly prolongs the duration of battery energy, increases the service life of the battery, and reduces investment costs.

As shown in Figure 1, the photovoltaic conversion unit is a photovoltaic inverter. Photovoltaic inverters are known in the art.

As shown in Fig. 1 , the household power grid includes mains power, long-distance power transmission lines and home appliance loads, and the mains power is connected to the home appliance loads via long-distance power transmission lines.

The above technical features constitute the best embodiment of the utility model, which has strong adaptability and best implementation effect, and non-essential technical features can be increased or decreased according to actual needs to meet the needs of different situations.

Claims (5)

1. A low-voltage photovoltaic compensation device at the end of a distribution network, characterized in that it includes a household power grid, a photovoltaic panel and a photovoltaic conversion unit that can convert the direct current generated by the photovoltaic panel into the alternating current of the mains frequency. The conversion unit is electrically connected, and the photovoltaic conversion unit is connected in series in the household grid. The photovoltaic conversion unit converts the direct current generated by the photovoltaic panel into the AC frequency of the mains frequency, and outputs the alternating current to the household grid, and compensates the voltage of the household load interface in the household grid. to 220V. 2. The low-voltage photovoltaic compensation device at the end of the distribution network according to claim 1, characterized in that it further comprises a storage battery, and the storage battery is electrically connected to the photovoltaic battery panel and the photovoltaic conversion unit respectively. 3. The low-voltage photovoltaic compensation device at the end of the distribution network according to claim 1 or 2, wherein the photovoltaic conversion unit is a photovoltaic inverter. 4. The low-voltage photovoltaic compensation device at the end of the distribution network according to claim 1 or 2, characterized in that the household power grid includes mains power, long-distance transmission lines and home appliance loads, and the mains power is connected to home appliance loads through long-distance transmission lines connect. 5. The low-voltage photovoltaic compensation device at the end of the distribution network according to claim 3, wherein the household power grid includes mains power, long-distance transmission lines and home appliance loads, and the mains power is connected to home appliance loads through long-distance transmission lines.