Charging and discharging control method and application device thereof
A charge and discharge control, charge and discharge technology, applied in the direction of circuit devices, battery circuit devices, data exchange chargers, etc., can solve the problem of system operation stability, photovoltaic system output voltage and output power oscillation, and inability to effectively respond to power distribution commands And other issues
Pending Publication Date: 2021-11-09
SUNGROW ENERGY STORAGE TECH CO LTD
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Problems solved by technology
[0004] The inventors have found that the charging and discharging control method of the energy storage system in the prior art distributes the total power to be distributed among the energy storage branches in each control cycle, which may easily cause the energy storage branches to If the power is greater than the corresponding limit value and cannot effectively respond to the power allocation command, the entire photovoltaic storage system cannot meet the actual application requirements. At the same time, the shared power of each energy storage branch varies greatly, and it is easy to cause the output voltage and Oscillation of output power affects the stability of system operation
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[0074] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0075] The charge and discharge control method provided by the embodiment of the present invention is applied to an energy storage system including multiple energy storage branches. The output end of the energy storage system is connected to the AC power grid through an inverter. In an optional application scenario, the Including the photovoltaic system, the output end of the photovoltaic system is also connected to the DC side of the inverter. Specifically, the charging and discharging con...
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The invention discloses a charging and discharging control method and an application device thereof, which are applied to the technical field of power supply. The method is applied to an energy storage system which comprises a plurality of energy storage branches and is connected with an inverter, and after a total power correction value of the energy storage system and basic charging and discharging power of each energy storage branch in a previous control period are obtained, on the basis of the basic charging and discharging power of each energy storage branch, a total power correction value is distributed among the energy storage branches to obtain reference charging and discharging power of each energy storage branch, and the corresponding energy storage branch is controlled to charge and discharge based on each reference charging and discharging power. According to the method, the total power correction value to be distributed is the difference value between the target operation power and the actual operation power of the inverter in the current control period and is far smaller than the target operation power of the current control period, so that the power change corresponding to each energy storage branch is small, the possibility of exceeding the charging and discharging power amplitude limiting value of the energy storage branch is reduced, and the stability and reliability of system operation are ensured.
Description
technical field [0001] The invention relates to the technical field of power supply, in particular to a charging and discharging control method and an application device thereof. Background technique [0002] see figure 1 , figure 1 It is a schematic structural diagram of an optical storage system in the prior art. The optical storage system includes a photovoltaic system, an energy storage system, an inverter, and a controller. The energy storage system includes multiple energy storage branches, and any energy storage The branches include energy storage batteries and DC / DC converters connected in series. The output ends of each energy storage branch and the output end of the photovoltaic system are respectively connected to the DC side of the inverter, and the AC side of the inverter is connected to the AC grid. , the controller is respectively connected with each energy storage branch in the energy storage system, and controls the charging and discharging process of each...
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IPC IPC(8): H02J3/38H02J1/10H02J1/14H02J7/00H02J7/35
CPCH02J3/381H02J1/10H02J1/14H02J7/0013H02J7/00036H02J7/0048H02J7/0068H02J7/00712H02J7/35H02J2300/24Y02E10/56
Inventor 范冬冬周旭东吴晓磊
Owner SUNGROW ENERGY STORAGE TECH CO LTD