A power allocation method for hybrid energy storage system using 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 utilization rate is reduced, and the cut-off characteristics at the handover frequency are poor, so as to achieve the optimal cut-off characteristics, improved utilization, and improved cut-off characteristics
Active Publication Date: 2021-12-21
中国能源建设集团天津电力设计院有限公司 +1
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[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] The embodiments of the present invention will be further detailed below with reference to the accompanying drawings:
[0052] A hybrid energy distribution method using multi-order filtering, including the following steps:
[0053]Step 1, construct a multi-order filter transmission function;
[0054] The specific method of step 1 is: based on the analysis of power storage capacity accumulation factors based on first-order Badwozi filtering, constructing multi-stage high-pass filter transmission function As shown in the formula (9):
[0055]
[0056] Super capacitance energy storage power instructions using multiplined filter power distribution methods Lithium battery storage power command From:
[0057]
[0058]
[0059] It is understood from the formula (10) that the multi-stage high pass filtering link corresponds to the series of a plurality of first-order high pass filtering links, and therefore, its handover frequency is still ω = 1 / t, and the higher the step...
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The present invention relates to a power distribution method for a hybrid energy storage system using multi-stage filtering, and its technical features include the following steps: step 1, constructing a multi-order filtering transfer function; step 2, constructing a multi-order filtering transfer function based on step 1 , calculate the response of the multi-order high-frequency filtering link to the mixed energy storage power command, and then analyze the capacity recovery characteristics of the multi-order high-pass filter; step 3, based on the analysis of the capacity recovery characteristics of the multi-order high-pass filter in step 2, formulate the selection principle of the handover frequency . The invention can overcome the integral effect when the first-order Butterworth filter responds to the high-frequency power command, and improves the utilization rate of the power-type energy storage.
Description
Technical field [0001] The present invention belongs to the field of power distribution technology of the energy storage system, involving the power distribution method of mixing energy storage systems, in particular a hybrid energy distribution method using multi-order filtering. Background technique [0002] The hybrid energy storage system is usually composed of lithium battery energy storage and supercapacitor storage, which is applied to the wind power flow control system to compensate for wind power prediction errors, improve tracking schedule capabilities, system structure figure 1 Indicated. [0003] Ignore the energy loss of each part of the system, such as figure 1 The active power balance relationship of the wind power flow control system is: [0004] P HESS = P LB + P SC (1) [0005] P HESS + P Wind = P Grid (2) [0006] In P HESS For mixed energy storage system power command, P LB For lithium battery storage energy output power; P SC Super capacitor energy storage ou...
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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