An energy storage system and its control method and control device
A technology of energy storage system and control method, which is applied in the direction of AC network load balancing, reactive power adjustment/elimination/compensation, reactive power compensation, etc., and can solve the problem that the energy storage system cannot exceed the maximum demand and the power factor cannot be lower than the lower limit And other issues
Active Publication Date: 2019-08-13
SUNGROW POWER SUPPLY CO LTD
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[0003] However, after multiple energy storage units are operated in parallel, the energy storage unit is equivalent to a power supply, so the change of the working state of the energy storage unit will inevitably affect the power flow of the bus in the factory area, so two issues need to be considered at this time: 1) The energy storage system cannot take power from the grid beyond the maximum demand; 2) The power factor of any incoming line cannot be lower than the lower limit
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[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] The embodiment of the present invention discloses a control method for an energy storage system. The energy storage system uses multiple energy storage units connected to multi-circuit incoming lines to run in parallel, for example figure 1 As shown in , multiple energy storage units are connected to the double-circuit incoming line and run in parallel.
[0027] figure 1 In the energy storage system shown, the double-circuit incoming lines drawn from t...
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The application discloses an energy storage system and a control method and device thereof. The method includes: sending (Pmax-PV)*Pi / P[Sigma] and PFV to a control unit in an i-th normally operating energy storage unit,wherein i=1, 2, ..., N, N is the total number of the energy storage units in normal operation, PV is the sum of active power of all incoming lines, and PFV is the minimum power factor of all incoming lines, Pci and Pi are the current charging power and the rated charging power of the i-th normal operating energy storage unit, P[Sigma]=P1+P2+...+PN, Pmax is the maximum power demand of the energy storage system from a grid; and causing the control unit to control the maximum charging power of the current energy storage unit at a next moment not to exceed the minimum value of the Pci+(Pmax-PV)*Pi / P[Sigma] and the Pi so as to ensure that PV is less than or equal to Pmax, and also causing the control unit to adjust the reactive output of the current energy storage unit so that the PFV is not lower than the lower limit of the power factor.
Description
technical field [0001] The present invention relates to the technical field of power system energy management, and more specifically, relates to an energy storage system and its control method and control device. Background technique [0002] At present, the construction of the energy storage system in the factory area tends to use multiple energy storage units connected to multi-circuit incoming lines to run in parallel to achieve optimal dispatch and management of energy. [0003] However, after multiple energy storage units are operated in parallel, the energy storage unit is equivalent to a power supply, so the change of the working state of the energy storage unit will inevitably affect the power flow of the bus in the factory area, so two issues need to be considered at this time: 1) The energy storage system cannot take power from the grid beyond the maximum demand; 2) The power factor of any incoming line cannot be lower than the lower limit. [0004] Note: In this ...
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IPC IPC(8): H02J3/32H02J3/18
CPCH02J3/18H02J3/32Y02E10/56Y02E40/30
Inventor 白云球孙德亮曹伟余勇
Owner SUNGROW POWER SUPPLY CO LTD