Hybrid power supply system for photovoltaic off network, photovoltaic combined network, city network and energy storage
A power supply system and energy storage battery technology, applied in photovoltaic power generation, light radiation generators, collectors, etc., can solve problems such as poor flexibility, high matching requirements, and grid-connected inverters losing reference standards, and achieve the goal of optimal design Effect
Active Publication Date: 2013-06-05
BEIQI FOTON MOTOR CO LTD
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But its main disadvantage is: in the photovoltaic grid-connected power supply mode, the grid-connected inverter determines its output voltage amplitude and phase based on the grid voltage, that is, the photovoltaic power supply is subject to the power supply status of the grid, once the grid is powered off , the grid-connected inverter loses its reference, so PV grid-connected power supply cannot operate in island mode
But its main disadvantages are: the matching requirements of each link of the system design are high, and the flexibility to deal with load changes is poor.
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[0032] 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 only for explaining the present invention and should not be construed as limiting the present invention.
[0033] In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, struc...
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The invention provides a hybrid power supply system for a photovoltaic off network, a photovoltaic combined network, a city network and energy storage. The hybrid power supply system comprises the city network, a photovoltaic power supply, a photovoltaic bimodule inverter, an energy storage battery, an energy storage bidirectional converter, a user load and an absorbing load. The city network is used for supplying power for the user load and for bearing electric energy of a photovoltaic feedback network. After the photovoltaic power supply and the photovoltaic bimodule inverter are connected, the photovoltaic power supply is used for supplying power for the user load and feeding back photovoltaic power supply to the city network. After the energy storage battery is connected with the energy storage bidirectional converter, the energy storage battery is connected with the photovoltaic power supply and the photovoltaic bimodule inverter to charge the energy storage battery through the photovoltaic power supply and to supply power for the user load through the photovoltaic bimodule inverter. The absorbing load is connected with the photovoltaic power supply to consume surplus energy after the photovoltaic power supply supplies power for the user load and charges the energy storage battery. According to the hybrid power supply system, complementary of advantages and disadvantages of power supply of the photovoltaic off network and the photovoltaic combined network is achieved, and the hybrid power supply system is beneficial for an optimization design of a maximized system.
Description
technical field [0001] The invention relates to the field of photovoltaic power supply, in particular to a household small-scale photovoltaic off-grid, city grid and energy storage hybrid power supply system. Background technique [0002] At present, there are mainly two forms of photovoltaic power supply products for household units on the market: (1) grid-connected power supply: the electric energy generated by the photovoltaic power supply source is integrated with the grid-connected inverter and the city grid to supply power to the load; (2) off-grid power supply : The electric energy generated by the photovoltaic power supply is isolated from the city grid to supply power to the load independently. Whether it is on-grid or off-grid, it needs to be equipped with a certain capacity of energy storage to ensure the quality of power supply and make full use of the electricity generated by photovoltaics. [0003] The characteristic of grid-connected power supply is that the ...
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IPC IPC(8): H02N6/00H02J7/00H02J3/38
CPCY02E10/563Y02E10/56Y02E70/30
Inventor 罗非
Owner BEIQI FOTON MOTOR CO LTD