A plug-and-play solar photovoltaic power generation control system and method

Abstract

The invention discloses a plug-and-play solar photovoltaic power generation control system. The plug-and-play solar photovoltaic power generation control system comprises an inversion unit, a grid-connected switch, a DC voltage detection device, an AC current detection unit and an AC voltage detection device and also comprises a control unit, wherein the control unit is used for measuring the AC voltage u<s> and the AC current i<s> output from the inversion unit through all detection devices; a pulse width modulation (PWM) signal of the inversion unit is obtained by calculation and used for controlling the output voltage and frequency of the inversion unit; the system can be used for eliminating voltage deviation caused by reactive power imbalance and frequency deviation caused by active power imbalance, and has functions of plug-and-play and seamless witching; in a grid-connected running mode, photoelectricity and a power grid both can supply power to a local load; and in an independent running mode, the photoelectricity supplies power to the local load. Correspondingly, the invention also discloses a plug-and-lay solar photovoltaic power generation control method.

Description

technical field [0001] The invention relates to a solar photovoltaic power generation control system and method, in particular to a plug-and-play solar photovoltaic power generation control system and method. Background technique [0002] Energy is an important material basis for the survival and development of human beings, and it is also an important factor affecting national security. Traditional petrochemical energy belongs to non-renewable energy and is facing the danger of depletion. At the same time, the burning of fossil fuels has caused severe pollution to the atmosphere. [0003] In order to solve the major problem of energy supply, countries all over the world have accelerated the development of new energy sources. As a clean energy source, solar energy has the following characteristics: first, it is inexhaustible; second, it is easy to obtain and ubiquitous; third, it is clean and pollution-free. [0004] The development and utilization of solar energy is an ef...

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Problems solved by technology

[0005] Among them, distributed power generation is more and more concerned by the market because it is directly installed at the user end and is easy to consume locally. By the end of 2014, the installed capacity of distributed solar photovoltaic power generation had reached 5 million kilowatts. The power outage interference caused inconvenience to users; when the power grid fails, it causes the switching of the solar photovoltaic power generation control mode at the user end, which also affects the user's power supply

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