Structure and method for solar power grid-connection self-use multi-functional system

Abstract

The invention belongs to the technical field of application of solar power generation grid-connection self-use power supply, and in particular relates to a structure and a method for a solar power grid-connection self-use multi-functional system. In order to endow a solar power generation system with functions of power generation, grid connection and self-use, a technical scheme is changed through a direct current power regulating circuit, a system allocating control circuit, an electronic control switch group and a power on-off controllers, wherein according to technical scheme, the system structure is that solar power generation systems can supply power to alternating loads of users only through storage batteries and inverters, and the internal power path is single. Therefore, when the multi-purpose solar power generation power supply system which can generate power, connect the grids and realize self-use is constructed, the system hardware scale is reduced, the structure of the system and formation of the internal power path are optimized, power consumption and resource waste are reduced, the using efficiency of solar power is greatly improved, and return on investment is greatly increased.

Description

technical field [0001] The invention belongs to the application technical field of solar power generation and grid-connected self-use power supply, and in particular relates to a structure and method of a solar power grid-connected self-use multifunctional system. Background technique [0002] Governments of various countries attach great importance to new energy and policy encouragement, so that urban residents covered by power grids have joined the army of solar power sales and power supply under the profitable business model. Especially in Europe, this method has been rapidly developed and popularized. At present, the prior art products of solar and wind power generation generally adopt grid-connected power generation and selling power to supply power to the grid. There are two main reasons for this. One is the government subsidy policy, which is profitable; the other is that the technology is simple, directly connected to the grid, and the power generated by the unstable...

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Problems solved by technology

[0005] It can be seen that the existing technologies and methods of the solar power generation system that can not only generate electricity and be connected to the grid, but also be used by itself are mainly composed of the existing structures and functions of the existing grid-connected and off-grid systems. The characteristic is that all the power supply for the user's AC load must pass through the battery and inverter; that is, on the basis of maintaining the grid-connected structure of the solar power generation grid-connected system, solar power is obtained and stored, that is, the battery is stored through the charger. In the way of electricity, the unstable power is stored first, and then the corresponding power is supplied to the user through the battery and the inverter, so that the unstable solar power becomes a stable DC power, which is supplied to the user through the inverter To perform power conversion to meet the power demand of the load, the system needs to add MPPT and DC / DC modules, intelligent charging circuits, step-up DC / DC circuits, user-level inverter circuits and related control circuits; if the power grid is normal during operation, and In the case of insufficient power generation, the system structure and power path of the prior art require the grid power to charge the battery through the AC / DC conversion circuit and the smart charger before supplying power to the AC load, and it needs to be converted by the off-grid inverter before supplying power. , consumes a lot of power resources and equipment resources

As mentioned above, the structure and power path design of the solar energy user power supply system in the prior art not only waste a lot of resources and increase investment, but also increase the links and losses of power conversion, reducing the power supply efficiency of the system

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