Inverter direct-current side coupling energy storage system and photovoltaic capacity matching configuration and energy storage configuration methods
An energy storage system and inverter technology, applied in photovoltaic power generation, current collectors, energy storage, etc., can solve problems such as increased cost of energy storage systems, achieve system cost reduction, reduce the number of configurations, and improve overall efficiency.
Pending Publication Date: 2022-02-01
SPIC QINGHAI PHOTOVOLTAIC IND INNOVATION CENT CO LTD +1
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[0005] In addition, in the photovoltaic inverter AC side coupled energy storage system, in order to ensure that the energy storage system has sufficient power to absorb, the configuration capacity of the photovoltaic inverter must be increased to the same as the module capacity. The ratio is greater than or equal to 1.4), and the number of photovoltaic inverter configurations needs to be increased correspondingly, which will lead to an increase in the cost of the energy storage system
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[0030] In the present invention, the terms "arranged", "provided", and "connected" should be interpreted broadly. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary; internal connectivity. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
[0031] The terms "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", " Vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application a...
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The invention discloses an inverter direct-current side coupling energy storage system, which comprises a photovoltaic inverter, a plurality of groups of photovoltaic modules, direct-current converters, an energy storage battery cluster, a direct-current combiner box, an auxiliary transformer and a power distribution system, and one end of the photovoltaic inverter is connected with a power grid through a bus, and the other end of the photovoltaic inverter is connected with the photovoltaic modules and the direct-current converter respectively; the power distribution system is connected with the bus through the auxiliary transformer to supply power to the photovoltaic inverter and the direct-current converters, at least two groups of photovoltaic modules are connected to the photovoltaic inverter through the same direct-current combiner box, and each direct-current converter is connected with a group of energy storage battery clusters. The invention further discloses a photovoltaic capacity matching configuration method and a photovoltaic energy storage capacity configuration method. As the energy storage system is connected to the power grid through the direct current side of the photovoltaic inverter, only the direct current converter of the corresponding voltage level of the direct current side of the photovoltaic inverter needs to be configured, a transformer can be omitted, the overall efficiency is obviously improved, and for a high-capacity-ratio photovoltaic system, the configuration number of the photovoltaic inverters and the system cost can be reduced.
Description
technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to an inverter DC side coupled energy storage system, a photovoltaic capacity ratio, and a photovoltaic energy storage capacity configuration method. Background technique [0002] The traditional photovoltaic energy storage system uses the inverter AC side coupled energy storage system to store photovoltaic power generation. This inverter AC side coupled energy storage system is connected to the grid through the photovoltaic inverter AC side, and its grid-connected voltage level must be the same as that of the inverter. The voltage on the AC side of the transformer is the same. [0003] The outlet voltage of grid-connected photovoltaic inverters in the market is generally 800V, so the grid-connected voltage of the energy storage system is 800V, and the outlet voltage of most energy storage converters often cannot reach 800V, so a step-up isolation transformer n...
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IPC IPC(8): H02J3/38H02J3/32H02J3/46H02J7/35
CPCH02J3/38H02J3/381H02J3/46H02J3/32H02J7/35H02J7/0013H02J2300/24Y02E10/56Y02E70/30
Inventor 庞秀岚马丽李晓峰雷文君赵欣昕陈晓聪李宪景占海
Owner SPIC QINGHAI PHOTOVOLTAIC IND INNOVATION CENT CO LTD