Solar photovoltaic grid-connected system

Abstract

The invention relates to a solar photovoltaic grid-connected system. The system comprises a grid-connected generation unit, a grid-connected inverter, a master controller, a bidirectional electric energy metering device, a distribution switch and an isolation transformer, wherein the grid-connected generation unit is connected with the grid-connected inverter; the grid-connected inverter is connected with the bidirectional electric energy metering device through the distribution switch; the bidirectional electric energy metering device is accessed to an alternating current power grid through the isolation transformer; and a safety protection device is arranged between the isolation transformer and the alternating current power grid. The grid-connected generation unit comprises at least two photovoltaic arrays, and each photovoltaic array is configured with a photovoltaic lightning-proof combiner box. The grid-connected inverter is connected with the master controller through an inversion control device arranged in the inverter; the isolation transformer is connected with the master controller through a transformer measurement and protection device arranged in the transformer; the bidirectional electric energy metering device and the distribution switch are also connected with the master controller. The master controller adopts a dual-core controller which includes a DSP (Digital Signal Processor) and an FPGA (Field Programmable Gate Array).

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to a solar photovoltaic grid-connected system. Background technique [0002] In recent years, with the shortage of non-renewable energy such as coal and oil, energy issues have been paid more and more attention by countries all over the world. As a new energy source with great potential, solar energy is the energy produced by the continuous nuclear fusion reaction inside the sun. Research and practice have shown that the energy directly radiated from the sun to the earth is very rich, widely distributed, renewable, and does not pollute the environment. Every 40 seconds, there is energy equivalent to 21 billion barrels of oil, which is equivalent to the energy consumed by the world in one day. Energy, so solar energy is an ideal alternative source of non-renewable energy recognized by the international community. According to the way of energy conversion...

AI Technical Summary

Problems solved by technology

However, due to the problems existing in the existing distributed grid-connected power generation system, the structure between the photovoltaic module and the grid-connected inverter is complex, the performance of the inverter is unstable, which affects the stability of the entire system, and the inverter becomes The sinusoidal alternating current is directly connected to the public grid, which causes large fluctuations and instability of the grid voltage range, and lacks the function of the existing distribution automation system to uniformly supervise the power generation system, so it needs to be improved

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