A three-phase grid-connected power inverter module suitable for photovoltaic-storage integrated power generation system
A power inverter module and power generation system technology, applied in the direction of energy storage, greenhouse gas reduction, AC network load balancing, etc., can solve the problem of increasing the volume, weight and cost of battery energy storage systems, and the three-phase grid-connected PCS does not have energy storage Capacity, sacrificing power generation and other issues, to achieve the effect of facilitating grid dispatch and coordination, improving power generation efficiency, and avoiding frequency adjustment
Active Publication Date: 2018-07-10
西大(常熟)研究院有限公司
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Problems solved by technology
[0005] ①: The inductance included in the DC / DC module increases the volume, weight and cost of the battery energy storage system;
[0006] ②: The three-phase grid-connected PCS does not have the energy storage capacity, that is, when the photovoltaic resources are more abundant, the grid-connected PCS transmits more power to the grid; when the photovoltaic resources are scarce, the power transmitted by the grid-connected PCS to the grid decreases accordingly
Therefore, the power emitted by the grid-connected PCS has strong fluctuations, and when the grid-connected power of the grid-connected PCS is limited, the phenomenon of sacrificing power generation will occur, resulting in a large amount of energy waste
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[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0051] The present invention provides a three-phase grid-connected power inverter module suitable for an integrated solar-storage power generation system, which can realize:
[0052] ①: When the photovoltaic power generation is excessive, store the excess energy in the energy storage device;
[0053] ②: When the photovoltaic power generation is insufficient, the energy storage device will send the corresponding lack of energy to the grid to ensure the stability of the grid.
[0054] (1) if figure 1 The power inverter module sho...
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The invention provides a three-phase grid-connected power inverter module applicable to an optical record integrated power generation system. The three-phase grid-connected power inverter module comprises a solar panel, wherein the solar panel is accessed into a power grid through a three-phase full-bridge inverter circuit; a connection point of any phase of bridge arm in the three-phase full-bridge inverter circuit passes through a storage battery power inverter unit and an electric reactor in sequence and is accessed into the power grid; the connection points of other two phases of bridge arms in the three-phase full-bridge inverter circuit respectively pass through the electric reactor and are directly connected with the power grid; and the storage battery power inverter unit comprises a storage battery which is connected to two ends of a two-phase full-bridge inverter circuit. Compared with the prior art, according to the three-phase grid-connected power inverter module applicable to the optical record integrated power generation system, grid-connected power generation and redundant electric energy storage and release can be simultaneously realized; reduction of generation power fluctuation is facilitated; the generating efficiency is improved; electric energy can be further provided to a load at night; and the three-phase grid-connected power inverter module is applied to the occasions of an independent power grid, a small power grid and the like.
Description
technical field [0001] The invention relates to a three-phase grid-connected power inverter module, in particular to a three-phase grid-connected power inverter module suitable for an optical-storage integrated power generation system. Background technique [0002] With the in-depth development of grid connection and transmission and distribution technologies of intermittent power sources such as wind energy and solar energy, battery energy storage systems have also been widely used; as a key device for the stable operation of battery energy storage systems, power conversion systems (PCS) are used In order to realize the two-way energy transfer between the DC battery of the battery energy storage system and the AC grid, the charge and discharge management of the battery system, the tracking of the load power on the grid side, the control of the charge and discharge power of the battery energy storage system, and the control of the battery energy storage system are realized th...
Claims
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IPC IPC(8): H02J3/38H02J3/32
CPCY02E70/30
Inventor 林昌明
Owner 西大(常熟)研究院有限公司