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Photovoltaic + energy storage into the future development trend
- Jun 21, 2018 -

Today, the development of new energy has two major driving forces.

First, human development and sustainability must have energy and must be new energy and clean energy.

Second, human beings must have a clean environment for sustainable development.

Solar energy is inexhaustible and inexhaustible. As a new energy source, it has natural and unparalleled advantages.

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Renewable energy systems are mainly distributed development, changing the point-based large-scale energy supply system, which provides space for the development of new energy storage systems. Specifically, an office building, an agricultural greenhouse, and even a house can all become energy production sites. For example, in an office building, a solar photovoltaic module is installed on the top of a building, a wind turbine is installed to form a wind and light, and internal sewage is collected to form sewage power through the potential energy of water. This building can realize self-supply of electricity. A variety of processing companies can also use waste to form biomass to generate electricity, and so on.

Distributed solar energy and energy storage technology combine several advantages. Solar energy and energy storage technology have their own advantages. Solar power can achieve zero carbon emissions without additional costs. Energy storage technology provides backup power, FM, and other grid services. Combine the two to obtain further advantages. In particular, it can realize continuous power supply at night, increase the output during the available power generation time, and improve the flexibility of the power grid. In distributed communities and rooftop systems, the combination of solar energy and energy storage technology can also reduce pressure on the distribution network and postpone or reduce infrastructure investment. At the macro level, energy storage and solar power generation can increase the penetration of solar facilities without major changes, thereby reducing carbon emissions. The combination of energy storage technology and solar power generation can also serve as a fast channel for electrification in emerging markets.

The establishment of photovoltaic and energy storage smart microgrids can increase new energy penetration and absorption capacity, better meet the diversity needs of users, achieve accurate energy supply, reduce power consumption deviations, and increase assessment earnings. The addition of energy storage at the household power station can reduce the user's dependence on the power grid and use electricity more freely.

The working modes of photovoltaic energy storage equipment are divided into two types:

One is a grid-connected home energy storage system, and the other is an off-grid home energy storage system.

On-grid home energy storage system is divided into three working modes:

Mode 1: Photovoltaic provides energy storage and surplus electricity access;

Mode 2: PV provides energy storage and some users use electricity;

Mode 3: PV provides only part of the energy storage.

The off-grid home energy storage system is divided into three working modes:

Mode 1: Photovoltaic energy storage and user electricity (sunny days);

Mode 2: Photovoltaic and energy storage batteries provide users with electricity (cloudy days);

Mode 3: The energy storage battery provides users with electricity (in the evening and rainy days).

Because the off-grid home energy storage system is independent and does not have any electrical connection with the power grid, the entire system does not require a grid-connected inverter, and the photovoltaic inverter can meet the requirements.

In general, people can store surplus electricity during the trough period and use it again when they use electricity. This reduces the waste of electricity. In addition, energy-storage power stations can reduce line losses and increase lines and equipment. Service life, response to user needs, accurate energy supply.