Hybrid energy storage system power distribution method by adopting multi-order filtering
A technology of hybrid energy storage system and distribution method, which is applied in the field of power distribution of hybrid energy storage system using multi-stage filtering, which can solve the problems that the capacity cannot be restored, the cut-off characteristics at the handover frequency are poor, and the utilization rate is reduced, so as to achieve the optimal cut-off characteristics, improved cut-off characteristics, and improved utilization
Active Publication Date: 2020-04-17
中国能源建设集团天津电力设计院有限公司 +1
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Problems solved by technology
[0021] To sum up, the existing hybrid energy storage system power allocation method based on the first-order Butterworth low-pass filter has two main defects. One of the factors that affect its performance is the accumulation of charging or discharging capacity. The second is the integral effect of the first-order Butterworth high-frequency filter link responding to the mixed power command, which will cause the accumulated capacity of supercapacitor energy storage charging or discharging to not be recovered. , further reducing its utilization
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[0051] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:
[0052] A hybrid energy storage system power distribution method using multi-stage filtering, comprising the following steps:
[0053]Step 1, constructing a multi-order filter transfer function;
[0054] The specific method of the step 1 is: based on the analysis of the accumulation factors of the power-type energy storage capacity caused by the first-order Butterworth filter, a multi-order high-pass filter transfer function is constructed As shown in formula (9):
[0055]
[0056] Then the supercapacitor energy storage power command using the multi-stage filter power distribution method Lithium battery energy storage power instruction They are:
[0057]
[0058]
[0059] It can be seen from formula (10) that the multi-order high-pass filter is equivalent to the series connection of multiple first-order high-pass filters, therefore, ...
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The invention relates to a hybrid energy storage system power distribution method by adopting multi-order filtering. The hybrid energy storage system power distribution method is technically characterized by comprising the following steps: step 1, constructing a multi-order filtering transfer function; step 2, based on the multi-order filtering transfer function constructed in the step 1, calculating a multi-order high-frequency filtering link response hybrid energy storage power instruction, and further analyzing a capacity recovery characteristic of multi-order high-pass filtering; and step3, formulating a handover frequency selection principle based on the capacity recovery characteristic analysis of the multi-order high-pass filtering in the step 2. According to the invention, the integral effect when the first-order Butterworth filter responds to the high-frequency power instruction can be overcome, and the utilization rate of power type energy storage is improved.
Description
technical field [0001] The invention belongs to the technical field of energy storage system power distribution, and relates to a hybrid energy storage system power distribution method, in particular to a hybrid energy storage system power distribution method using multi-stage filtering. Background technique [0002] The hybrid energy storage system usually consists of lithium battery energy storage and supercapacitor energy storage, which are applied to the wind power flow control system to compensate for wind power prediction errors and improve the ability to track and dispatch plans. The system structure is as follows: figure 1 shown. [0003] Neglecting the energy loss of each part of the system, as figure 1 The active power balance relationship of the wind power flow control system shown is: [0004] P HESS =P LB +P SC (1) [0005] P HESS +P Wind =P Grid (2) [0006] In the formula, P HESS is the power command of the hybrid energy storage system, P LB Outp...
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Login to View More IPC IPC(8): H02J3/32H02J3/38H02J7/34
CPCH02J3/32H02J7/345
Inventor 李学斌刘建伟刘伟陈海波陈世龙
Owner 中国能源建设集团天津电力设计院有限公司