Intelligent power grid distributed self-supporting photovoltaic power supply system

Abstract

The invention discloses an intelligent power grid distributed self-supporting photovoltaic power supply system. The system comprises a central controller, a DC / DC (direct current to direct current) direct chopper circuit, a power dispensable circuit, a DC / AC (direct current to alternating current) bidirectional inverter circuit, an island detection circuit and an energy accumulator, wherein the central controller is used for collecting data in real time, and controlling the DC / DC direct current chopper circuit, the power dispensable circuit, the DC / AC bidirectional inverter circuit, the island detection circuit and the energy accumulator through analytic calculation, so that the seamless switching between synchronization network and off network can be realized, the synchronization mode operation when a public utility grid is normal can be guaranteed, the system can quickly perform the automatic off-line and off-network mode operation when power is down, the remote dispatching acceptability to a public power grid, the power interaction between the system and the power grid, the off-peak power consumption of load and economical operation of the system can be realized, the power supply quality can be improved, the safety and the reliability of loaded power consumption can be guaranteed, the spontaneous self-supply rate of the system can be improved, and the impact of intermittency and fluctuation of photovoltaic power output to the power grid can be reduced.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power supply, and more specifically, to a distributed self-supporting photovoltaic power supply system of a smart grid. Background technique [0002] Energy is the foundation of economic and social development, but also the main factor affecting economic and social development. With the development of the economy and society, people use more and more energy, especially fossil energy, the constraints of energy on economic and social development are becoming more and more prominent, and the impact on the natural environment on which they live is also increasing, and fossil energy will eventually be consumed Exhausted. Therefore, improving energy utilization efficiency, adjusting energy structure, developing and utilizing renewable energy will be an inevitable choice for energy development. [0003] At present, with the rapid progress of photovoltaic power generation technology, the scale of r...

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Problems solved by technology

[0004] However, the proportion of civilian solar cell products for export is relatively high, and the application level and scale of domestic residents' self-use photovoltaic power supply systems are low, and the photovoltaic power supply systems are only economically beneficial when used in areas without electricity; However, there are still disadvantages in power transmission and power storage

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