A single-phase photovoltaic grid-connected power generation system output power smoothing control device and control method

Abstract

The invention provides a single-phase grid-connected photovoltaic power generation system output power smooth control device and a control method. The device comprises a grid-connected photovoltaic power generation system which consists of a photovoltaic power source, a Boost convertor, a direct current filter capacitor, a storage battery, a first bidirectional direct current convertor, a supercapacitor, a second bidirectional direct current convertor and an inverter, and also comprises a first control device and a second control device which respectively control the charging and discharging of the storage battery and the supercapacitor; the storage battery adopts a double-closed-loop control mode of power external loop and current internal loop; the supercapacitor adopts a double-closed-loop control mode of voltage external loop and current internal loop; the instantaneous power can be rapidly balanced, harmonic waves can be inhibited, the waveform deviation factor of grid-connected current can be reduced, and the grid-connected electric energy quality of a photovoltaic system can be improved.

Description

technical field [0001] The invention relates to the field of new energy distributed grid-connected power generation, in particular to a smooth control device and control method for the output power of a single-phase photovoltaic grid-connected power generation system. Background technique [0002] At present, photovoltaic power generation has gradually developed from a small-scale off-grid system to a large-scale grid-connected system. However, due to the influence of natural conditions such as light and temperature, the output power of the system has great intermittent and randomness. With the grid-connected operation of large-capacity photovoltaic power stations, the violent fluctuations of their power generation may lead to the collapse of the power grid system, seriously destroying the power and energy balance of the original power grid, making it difficult to dispatch and operate the power grid, and further affecting the power quality and construction planning of the po...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a single-phase photovoltaic grid-connected power generation system output power smoothing control device and control method, which can solve the problems of frequent fluctuations in output power of photovoltaic power generation systems and high harmonic content of grid-connected current

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