Energy-saving inversion boosting complete device and method for photovoltaic generation

Abstract

The present invention discloses an energy-saving inversion boosting complete device and method for photovoltaic generation. The device comprises a photovoltaic grid-connected inverter, a boosting power transformer and a switch unit. The photovoltaic grid-connected inverter is configured to convert direct current electric energy to alternating current electric energy, achieve a function of a voltage-adjustable alternating current power supply and emit a switch control command to the switch unit; the boosting power transformer is configured to boost the alternating current electric energy outputby the photovoltaic grid-connected inverter to a high voltage and then send the high voltage to a power grid; the switch unit is configured to conduct and disconnect the electrical connection betweenthe boosting power transformer and the power grid, detect voltage amplitudes and waveforms of the power grid side and the boosting power transformer side and perform feedback of the voltage amplitudes and waveforms to the photovoltaic grid-connected inverter. The energy-saving inversion boosting complete device and method for photovoltaic generation can greatly meet the requirement that the transformer is quitted at night in the photovoltaic power generation, can save energy consumption, can reduce the electricity charge, can timely input the transformer prior to generation without reductionthe reliability of the device life, and is ingenious in conception, convenient and rapid in implementation and good in application prospect.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation components, in particular to an energy-saving inverter booster complete set and method for photovoltaic power generation. Background technique [0002] With the rapid development of new energy technology, solar power generation has been widely used and developed rapidly. The main method of solar grid-connected power generation system is to output the photovoltaic grid-connected inverter in the photovoltaic module through a step-up power transformer (such as a box-type substation). Electric energy is fed into the grid (the voltage level in China is usually 10kV or 35kV), and currently there is actually no consideration of the energy waste of these power transformers consuming energy at no load when power generation is stopped at night. [0003] The solar grid-connected power generation system can collect solar radiation energy. Generally, the photovoltaic effect is used to con...

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Problems solved by technology

[0006] The excitation inrush current is related to the phase angle of the system voltage when the transformer is switched on, the residual magnetic flux of the transformer iron core, and the impedance of the power supply system. , In some cases, the inrush current can cause electric fluctuations. If no corresponding measures are taken, it may cause overcurrent of the transformer or malfunction of relay protection, resulting in power failure and affecting the use of other users.

In addition, high-voltage transformers do no-load closing operations every day to generate voltage and current shocks, thermal shocks, and electromagnetic effects caused by inrush currents, which will cause mechanical forces and vibrations inside the transformer, thereby shortening its service life.

[0007] In order to meet the needs of photovoltaic power generation, the transformer can be withdrawn at night, so as to save energy consumption and reduce electricity costs. At the same time, it is a technical problem to be solved that the transformer should be put into operation in time before power generation without reducing reliability and equipment life.

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