Power supply system and control method for power supply system
A technology of power supply system and control method, which is applied in the direction of battery circuit devices, current collectors, electric vehicles, etc., can solve the problems of waste of battery capacity and waste of renewable energy, meet the requirements of reducing capacity, improve utilization rate, and reduce dependence Effect
Active Publication Date: 2018-09-11
BYD CO LTD
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Problems solved by technology
However, the disadvantage of related technologies is that a large-capacity energy storage battery is required to store renewable energy, which is likely to cause waste of renewable energy or waste of battery capacity.
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[0016] 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.
[0017] The control method of the power supply system and the power supply system implementing the control method according to the embodiments of the present invention will be described below with reference to the accompanying drawings.
[0018] figure 1 is a flowchart of a control method of a power supply system according to an embodiment of the present invention. The power supply system includes a photovoltaic cell, a DC / DC converter connected to the photovoltaic cell and the DC bus, an energy storage battery connected to the D...
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The invention discloses a power supply system and a control method of a power supply system. The power supply system comprises a photovoltaic cell, a DC / DC converter connected with the photovoltaic cell and a direct-current bus, an energy storage cell connected with the direct-current bus, a bidirectional transverter connected with the direct-current bus, and a switch assembly connected with the bidirectional transverter, an external inverter, a power grid, and a load. A first branch circuit is arranged between the switch assembly and the external inverter; and a second branch circuit is arranged between the switch assembly and the power grid. The control method includes: electricity of an energy storage cell is obtained; a needed power of a load is obtained; according to the electricity of the energy storage cell, the needed power of the load, and on / off states of the first branch circuit and the second branch circuit, at least one of the photovoltaic cell, the energy storage cell, the external inverter, and the power grid provides power for the load. With the method, an effect of generating own electricity and using the own electricity can be realized. Under the circumstance that normal power usage of users is guaranteed, power taking from the power grid can be reduced; the utilization rate of the renewable energy source is improved; the load of the power grid is reduced; and the capacity of the energy storage cell is reduced.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a control of a power supply system and a power supply system. Background technique [0002] With the development of green and renewable energy, centralized energy storage systems emerge as the times require, but with the increasing capacity of centralized energy storage systems, there are more and more problems with centralized management, and the market is gradually becoming saturated. The use of distributed energy storage systems has become a development trend. [0003] Relevant household energy storage systems mostly exist in the form of a single energy storage, which is used as an emergency power supply or a delayed power supply, or as an intermediate transitional power supply for unstable energy sources such as photovoltaics and wind power. The characteristic of the related household power supply system is that it is used as an auxiliary power grid energy. For exa...
Claims
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IPC IPC(8): H02J7/35
CPCY02E10/56
Inventor 李程曾宇张飞尹韶文
Owner BYD CO LTD