Photovoltaic power generation grid connection control method and photovoltaic power generation grid connection control system

Abstract

The invention discloses a photovoltaic power generation grid connection control method and a photovoltaic power generation grid connection control system. The photovoltaic power generation grid connection control method and the photovoltaic power generation grid connection control system have the advantages that by the aid of voltage and current information of photovoltaic cells, a disturbance method and an increment conductivity method are combined according to voltage change ratio, current change ratio and conductivity change ratio to perform maximum power point tracking (MPPT) control, and timely tracking of maximum power points is achieved during change of temperature and light radiation intensity, so that output efficiency of the photovoltaic cells is improved; a multi-control strategy is adopted, frequency, power and voltage of grid connection points are taken as control quantity, real-time dynamic response can be realized when photovoltaic cell grid connection and grid operation states are changed, and accordingly, control of photovoltaic power generation grid connection operation is realized.

Description

technical field [0001] The invention belongs to the technical field of grid-connected control of photovoltaic power generation, and more specifically relates to a method and system for grid-connected control of photovoltaic power generation. Background technique [0002] Solar energy is a sustainable and clean energy, and photovoltaic power generation (PV) is the most promising application field in the development and utilization of solar energy. At present, PV has completed the initial development and demonstration stage, and is developing towards mass production and large-scale application. Its application scope has covered almost all fields of electricity consumption. It is estimated that PV will account for 1% of the world's electricity production in 2020 and about 25% in 2050. The PV maximum power point depends on the operating temperature of the panel and the light level at that time, so it is necessary to consider how to control the photovoltaic cell to effectively t...

AI Technical Summary

Problems solved by technology

[0003] The existing photovoltaic grid-connected control method lacks a quick response to changes in the natural environment. When the temperature and light radiation intensity change, it cannot quickly track the maximum power point, and the power output of photovoltaic cells has a hysteresis

In addition, the photovoltaic grid-connected control method usually adopts constant power control to achieve constant output of active power and reactive power, so as to realize stable control of voltage and frequency, and the amount of control is small. Real-time dynamic response

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