Photovoltaic energy storage integrated converter

Abstract

The invention provides a photovoltaic energy storage integrated converter which consists of a DC (Direct Current)/DC part and a DC/AC (Alternating Current) part, wherein the DC/DC part adopts a modular design and supports a plurality of batteries to access; circuit branches at the side of DC/DC part support a storage battery and a photovoltaic battery to access; and the circuit branches can be controlled independently. When in on-grid running, the circuit branch of the storage battery at the side of the DC/DC part adopts constant power charge-discharge control, the photovoltaic branch performs MPPT (Maximum Power Point Tracking) control, and a power module at the side of the DC/AC part adopts PQ control; and when in off-grid running, the circuit branch of the storage at the side of the DC/DC part performs direct current busbar voltage constant voltage control, the photovoltaic branch performs MPPT control, and the power module at the side of the DA/AC part performs independent contravariant control. The photovoltaic energy storage integrated converter provided by the invention effectively solves the problems of asynchronous signals in units of an energy storage system and high cost due to independent converters required to be configured for direct current voltage resources such as storage batteries, photovoltaic solar panels and the like in the prior art.

Description

technical field [0001] The invention relates to the technical field of electric power systems, and more specifically, relates to a photovoltaic energy storage integrated converter. Background technique [0002] In a micro-grid system composed of distributed power sources, when new energy accounts for a large proportion of power capacity, due to the randomness and intermittent characteristics of new energy output, the fluctuation of new energy output will cause a greater impact on the power grid. Become uncontrollable waste electricity. At present, a variety of energy storage components, including various types of batteries, supercapacitors, and compressed air, are used to smooth the output of new energy and make it a controllable source, thereby ensuring power balance within the system. [0003] For the existing energy storage system, communication between multiple working units is required for coordinated control. Usually, the signals between the units cannot be synchroniz...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a photovoltaic energy storage integrated converter to overcome the problems in the prior art that the signals between the units in the energy storage system cannot be synchronized and the high cost caused by the separate configuration of the converter

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