DC and AC Solar Power System Pollution-free green energy
Solar energy is an inexhaustible, pollution-free green energy given by nature, but it has a random, intermittent nature. It is estimated that the Earth's energy from the sun a year is about 7 × 1017 kWh, China's land a year of solar energy obtained in 1.3 × 1016 kWh or so. Due to the different latitude and longitude of each region on the earth, the average daily sunshine and sunshine time in China are very different. The average daily sunshine in China is in the range of 2.6 kWh / m2d ~ 6.4 kWh / m2d, 300 h.
The solar power supply system consists of a solar cell module, a solar controller, and a battery (group). According to the actual needs can also be configured inverter. Solar energy is a clean renewable energy, in people's lives, work has a wide range of roles, one of which is the conversion of solar energy into electricity, solar power is divided into thermal power generation and photovoltaic power generation. Generally speaking, solar power refers to the solar photovoltaic power generation, with no moving parts, no noise, no pollution, high reliability, in remote areas of communication power supply system has an excellent application prospects.
The role of each part is:
(1) solar modules: solar modules are solar power supply system in the core part of the solar power supply system is the most valuable part. Its role is to convert the sun's radiant energy into electrical energy, or sent to the battery to store, or to promote the load work. The quality and cost of solar modules directly determine the quality and cost of the entire system.
(2) solar controller: the role of solar controller is to control the working state of the entire system, and the battery played a charge protection, over discharge protection role. In the larger temperature difference, the qualified controller should also have the function of temperature compensation. Other additional functions such as light control switches, time control switches should be optional controller.
(3) battery: usually lead-acid batteries, small micro-system, can also be used nickel-metal hydride batteries, nickel-cadmium batteries or lithium batteries. Its role is to light when the solar cell components will be stored in the power stored up to the time required to release.
Solar power supply system is divided into off-grid solar power supply system, and solar power supply system and distributed solar power supply system:
1, off-grid solar power supply system mainly by the solar cell components, controllers, batteries, such as the output power for the AC 220V or 110V, also need to configure the inverter.
2, grid-connected solar power supply system is generated by solar modules DC power through the grid inverter into the AC power grid in line with the requirements of the direct access to the public power grid. Grid-connected power generation systems are centralized large-scale grid-connected power plants are generally state-level power plants, the main feature is the power generation can be directly transported to the grid, the unified allocation of power to the user power supply. But this power plant investment, construction period is long, covers an area of large, not much development. The decentralized small-scale grid-connected power generation system, especially the integrated photovoltaic power generation system, is the mainstream of grid-connected power generation due to its small investment, fast construction, small footprint and strong policy support.