CN105205218A - Extension and analysis method of modularized energy storage system based on complicated network theory - Google Patents

Abstract

The invention provides an extension and analysis method of a modularized energy storage system based on a complicated network theory. Aiming at a topological structure of the modularized energy storage system, objects of the modularized energy storage system are abstracted into nodes in a complicated network, and the mutual effects between the objects are abstracted into a connection edge between the nodes of the network; and a binary network model is used for establishing a modularized energy storage system network model; the network model has clear physical significances and is easy to operate and realize by engineering personnel; aiming at a condition of augmenting the quantity of the nodes of a total single cell battery, through two types of extension modes that serial modules are multiplied and extended in series and voltage/power/capacity grades of the modularized energy storage system are extended, and parallel modules are multiplied and extended in parallel and the voltage/power/capacity grades of the modularized energy storage system are extended, an extension rule of the modularized energy storage system can be effectively found by using an extension evaluation index, and the extension of the structure of the modularized energy storage system is disclosed.

Description

A kind of modularization accumulator system extensive diagnostic method based on Complex Networks Theory

Technical field

The invention belongs to electric system energy-storage battery technical field, be specifically related to a kind of modularization accumulator system extensive diagnostic method based on Complex Networks Theory.

Background technology

Energy storage technology improves one of imbalance between power supply and demand and the gordian technique realizing energy sustainable development.All kinds of electrochemical cell energy storage technology is the modularization accumulator system that practical requirement palpus adopts several battery module connection in series-parallel to combine.The structure of modularization accumulator system comprises: the sub-network (meeting the minimal network unit of actual requirement) that the arm of a network (connection in series-parallel branch road) of basic comprising element (connection that battery cell is mutual with it), fundamental element composition, multilayer branch road are formed and the accumulator system (meeting multiple sub-network systems of workload demand) that multiple sub-network is formed.When the linear increase that component units (battery cell) quantity in modularization accumulator system is stable, the relation (connection in series-parallel scheme) between component units is but in accelerated growth trend, and the complicacy of system extension increases thereupon.

Complex Networks Theory is for studying by various mechanism control and the system of dynamic change.Use for reference the design experiences of modularization accumulator system real example and the theoretical research result of system science, build modularization accumulator system extension of network model, utilize complex network essential characteristic parameter and modularization accumulator system evaluation index, for how increasing battery cell quantity and adjustment connected mode, analysis and inspection is carried out in the expansion realizing extensive modularization accumulator system that how combines with actual demand and condition, thus realizes modularization accumulator system optimal design and have important practical significance.

The existing complication system network structure extensive diagnostic based on Complex Networks Theory and evaluation method obviously do not relate to built by modularization accumulator system network model, extended mode and evaluation index etc. carry out modularization accumulator system network structure extensive diagnostic and evaluation.

Summary of the invention

In order to the analysis of expansion with the amplification of battery node quantity of modularization accumulator system network structure can be carried out simply, accurately, the invention provides a kind of modularization accumulator system extensive diagnostic method based on Complex Networks Theory, acquisition module accumulator system cell quantity and topological structure, and adopt two subnetwork model construction module accumulator system network models; Calculate the expansion evaluation index of the modularization accumulator system under different mode of extension, finally according to expansion evaluation index, extensive diagnostic is carried out to modularization accumulator system.

In order to realize foregoing invention object, the present invention takes following technical scheme:

The invention provides a kind of modularization accumulator system extensive diagnostic method based on Complex Networks Theory, said method comprising the steps of:

Step 1: acquisition module accumulator system cell quantity and topological structure;

Step 2: adopt two subnetwork model construction module accumulator system network models;

Step 3: extensive diagnostic is carried out to modularization accumulator system according to expansion evaluation index.

In described step 2, node type in modularization accumulator system network model comprises the tie point node between cell node and cell, the annexation of cell node is as connecting limit, and cell node accesses adjacent attachment points node respectively, connects limit with not existing between category node; Single battery node and tie point node are connected successively and form series mould set, the two or more cell node that company accesses on limit adjacent tie point node respectively forms module in parallel, and series mould set and module in parallel are through parallel/serial composition module accumulator system network model.

Under total monomer battery node quantity amplification condition, mode of extension comprises the first mode of extension and the second mode of extension;

Described first mode of extension refers to the series connection multiplication expansion by series mould set, the voltage/power/capacitance grade of expanded mode blocking accumulator system;

Described second mode of extension refers to the parallel connection multiplication expansion by module in parallel, the current/power/capacitance grade of expanded mode blocking accumulator system.

Described step 3 comprises the following steps:

Step 3-1: the expansion evaluation index calculating the modularization accumulator system under different mode of extension;

Step 3-2: extensive diagnostic is carried out to modularization accumulator system according to expansion evaluation index.

In described step 3-1, under the first mode of extension, the expansion evaluation index of modularization accumulator system is series parallel structure coupling coefficient, series parallel structure coupling coefficient η _sPrepresent, have:

${\mathrm{\η}}_{SP}=\frac{N_{SP}}{N}---\left(1\right)$

Wherein, N _sPrepresent the summation of series parallel structure interior joint degree, the summation of N representation module accumulator system corresponding Global-Coupling nodes degree;

For m cell first series mould set in series, the series parallel structure of n series mould set parallel connection afterwards, the summation N of series parallel structure interior joint degree _sPbe expressed as:

N _SP＝n(m-1)+n(n-1)(3)

The summation N of modularization accumulator system corresponding Global-Coupling nodes degree is expressed as:

$N=\frac{nm(nm-1)}{2}---\left(4\right).$

In described step 3-2, under the second mode of extension, the expansion evaluation index of modularization accumulator system is and cascaded structure coupling coefficient, and cascaded structure coupling coefficient η _pSrepresent, have:

${\mathrm{\η}}_{PS}=\frac{N_{PS}}{N}---\left(5\right)$

Wherein, N _pSrepresent and the summation of cascaded structure interior joint degree;

For the first formation in parallel of n cell module in parallel, the also cascaded structure of m module series connection in parallel afterwards, and the summation N of cascaded structure interior joint degree _pSbe expressed as:

$N_{PS}=m\frac{n(n-1)}{2}+n^2(m-1)----\left(6\right).$

Compared with prior art, beneficial effect of the present invention is:

The present invention is directed to the topological structure of modularization accumulator system, by abstract for the object in the modularization accumulator system node become in complex network, interaction between object is abstract is company limit between network node, adopt two subnetwork model building module accumulator system network models, the physical significance of this network model is clear, is easy to engineering staff's operation and realizes;

For under total monomer battery node quantity amplification condition, by the series connection multiplication expansion of series mould set, the voltage/power/capacitance grade of expanded mode blocking accumulator system; The parallel connection multiplication expansion of module in parallel, current/power/capacitance grade two kinds of mode of extensions of expanded mode blocking accumulator system, utilize expansion evaluation index effectively can find the propagation law of modularization accumulator system structure, disclose and affect modularization accumulator system structure extension.

Accompanying drawing explanation

Fig. 1 is the modularization accumulator system extensive diagnostic method flow diagram based on Complex Networks Theory in the embodiment of the present invention;

Fig. 2 is the distribution plan of series parallel structure coupling coefficient in the embodiment of the present invention;

Fig. 3 is in the embodiment of the present invention and the distribution plan of cascaded structure coupling coefficient.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail.

The invention provides a kind of modularization accumulator system extensive diagnostic method based on Complex Networks Theory, said method comprising the steps of:

Step 1: acquisition module accumulator system cell quantity and topological structure;

Step 2: adopt two subnetwork model construction module accumulator system network models;

Step 3: extensive diagnostic is carried out to modularization accumulator system according to expansion evaluation index.

In described step 2, node type in modularization accumulator system network model comprises the tie point node between cell node and cell, the annexation of cell node is as connecting limit, and cell node accesses adjacent attachment points node respectively, connects limit with not existing between category node; Single battery node and tie point node are connected successively and form series mould set, the two or more cell node that company accesses on limit adjacent tie point node respectively forms module in parallel, and series mould set and module in parallel are through parallel/serial composition module accumulator system network model.

Under total monomer battery node quantity amplification condition, mode of extension comprises the first mode of extension and the second mode of extension;

Described first mode of extension refers to the series connection multiplication expansion by series mould set, the voltage/power/capacitance grade of expanded mode blocking accumulator system;

Described second mode of extension refers to the parallel connection multiplication expansion by module in parallel, the current/power/capacitance grade of expanded mode blocking accumulator system.

Described step 3 comprises the following steps:

Step 3-1: the expansion evaluation index calculating the modularization accumulator system under different mode of extension;

Step 3-2: extensive diagnostic is carried out to modularization accumulator system according to expansion evaluation index.

In described step 3-1, under the first mode of extension, the expansion evaluation index of modularization accumulator system is series parallel structure coupling coefficient, series parallel structure coupling coefficient η _sPrepresent, have:

${\mathrm{\η}}_{SP}=\frac{N_{SP}}{N}---\left(1\right)$

Wherein, N _sPrepresent the summation of series parallel structure interior joint degree, the summation of N representation module accumulator system corresponding Global-Coupling nodes degree;

For m cell first series mould set in series, the series parallel structure of n series mould set parallel connection afterwards, the summation N of series parallel structure interior joint degree _sPbe expressed as:

N _SP＝n(m-1)+n(n-1)(3)

The summation N of modularization accumulator system corresponding Global-Coupling nodes degree is expressed as:

$N=\frac{nm(nm-1)}{2}---\left(4\right).$

In described step 3-2, under the second mode of extension, the expansion evaluation index of modularization accumulator system is and cascaded structure coupling coefficient, and cascaded structure coupling coefficient η _pSrepresent, have:

${\mathrm{\η}}_{PS}=\frac{N_{PS}}{N}---\left(5\right)$

Wherein, N _pSrepresent and the summation of cascaded structure interior joint degree;

For the first formation in parallel of n cell module in parallel, the also cascaded structure of m module series connection in parallel afterwards, and the summation N of cascaded structure interior joint degree _pSbe expressed as:

$N_{PS}=m\frac{n(n-1)}{2}+n^2(m-1)---\left(6\right).$

Embodiment

Adopt y=2 ^x, x=2, the quantity y of 3 ~ 10 modes to cell node expand, and build mSnP connection in series-parallel and nPmS and the topological structure of series system.For 512 battery node:

MSnP series-parallel system: 512S1P, 256S2P, 128S4P ... 4S128P, 2S256P;

NPmS series system: 512P1S, 256P2S, 128P4S ... 4P128S, 2P256S;

Calculate y=2 ^x, the series parallel structure coupling coefficient η of x=2,3 ~ 10 totally 9 Battery pack node overall network structures _sPwith and cascaded structure coupling coefficient η _pS.

Adopt the series parallel structure coupling coefficient η of the network structure of mSnP series-parallel system _sPwith the distribution plan of the summation of modularization accumulator system corresponding Global-Coupling nodes degree, as shown in Figure 2 (bilogarithmic graph of log2).Along with number of nodes multiplication, the summation N of modularization accumulator system corresponding Global-Coupling nodes degree is power function N ~ f (y ²) trend increase: such as, when y is increased to 1024 by 4, the summation N of the modularization accumulator system corresponding Global-Coupling nodes degree that each order of magnitude node is formed is increased to 523776 by 12.Based on quantity n in parallel, namely the current class of system is constant, increases serial number m, realizes the expansion of network structure in electric pressure of (m × n) individual node.Along with the increase of serial number m, series parallel structure coupling coefficient η _sPpresent power function η _sP~ f (y ^-1) attenuation trend; Based on serial number m, namely the electric pressure of system is constant, increases quantity n in parallel, realizes the expansion of network structure on current class of (m × n) individual node.Along with the increase (during n<m) of quantity n in parallel, series parallel structure coupling coefficient η _sPpresent power function η _sP~ f (y ^-1) attenuation trend.Therefore, in the network structure adopting mSnP series-parallel system to form, along with the increase of number of nodes (power/capacity of accumulator system), when n<m, the increase of coupled relation and the linear increase of the increase of number of nodes between battery node.

Adopt nPmS and the also cascaded structure coupling coefficient η of the network structure of series system _pSdistribution plan, as shown in Figure 3 (bilogarithmic graph of log2).As shown in Figure 3, based on quantity n in parallel, namely the current class of system is constant, increases series connection progression m, realizes the expansion of network structure in electric pressure of (m × n) individual node, along with the increase of serial number m, and cascaded structure coupling coefficient η _pSpresent power function η _pS~ f (y ^-1) attenuation trend; Based on employing serial number m, namely the electric pressure of modularization accumulator system is constant, increases quantity n in parallel, realizes the expansion of network structure on current class of (m × n) individual node, along with the increase of quantity n in parallel, and cascaded structure coupling coefficient η _pSthough have no marked change, but the quantity absolute value of its coupled relation presents power function f (y ²) trend increase.Therefore, in the network structure adopting nPmS series system to form, along with the increase of number of nodes (power/capacity of accumulator system), the increase of coupling influence factor and the linear increase of the increase of number of nodes between series-connected cell node, between batteries in parallel connection node, the change of coupled relation and the increase of number of nodes y are 2 power function relationships.

The interpretation of result of above steps shows, the inventive method can carry out network structure extensive diagnostic to modularization accumulator system effectively, with total battery node quantity amplification, give the weight that series/parallel connected mode is shared in system structure expansion process quantitatively, can be the power response improving modularization accumulator system network and optimal design foundation is provided.

Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; those of ordinary skill in the field still can modify to the specific embodiment of the present invention with reference to above-described embodiment or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims of the present invention awaited the reply.

Claims (6)

1., based on a modularization accumulator system extensive diagnostic method for Complex Networks Theory, it is characterized in that: said method comprising the steps of:

Step 1: acquisition module accumulator system cell quantity and topological structure;

Step 2: adopt two subnetwork model construction module accumulator system network models;

Step 3: extensive diagnostic is carried out to modularization accumulator system according to expansion evaluation index.

2. the modularization accumulator system extensive diagnostic method based on Complex Networks Theory according to claim 1, it is characterized in that: in described step 2, node type in modularization accumulator system network model comprises the tie point node between cell node and cell, the annexation of cell node is as connecting limit, cell node accesses adjacent attachment points node respectively, connects limit with not existing between category node; Single battery node and tie point node are connected successively and form series mould set, the two or more cell node that company accesses on limit adjacent tie point node respectively forms module in parallel, and series mould set and module in parallel are through parallel/serial composition module accumulator system network model.

3. the modularization accumulator system extensive diagnostic method based on Complex Networks Theory according to claim 2, is characterized in that: under total monomer battery node quantity amplification condition, mode of extension comprises the first mode of extension and the second mode of extension;

Described first mode of extension refers to the series connection multiplication expansion by series mould set, the voltage/power/capacitance grade of expanded mode blocking accumulator system;

Described second mode of extension refers to the parallel connection multiplication expansion by module in parallel, the current/power/capacitance grade of expanded mode blocking accumulator system.

4. the modularization accumulator system extensive diagnostic method based on Complex Networks Theory according to claim 3, is characterized in that: described step 3 comprises the following steps:

Step 3-1: the expansion evaluation index calculating the modularization accumulator system under different mode of extension;

Step 3-2: extensive diagnostic is carried out to modularization accumulator system according to expansion evaluation index.

5. the modularization accumulator system extensive diagnostic method based on Complex Networks Theory according to claim 4, it is characterized in that: in described step 3-1, under the first mode of extension, the expansion evaluation index of modularization accumulator system is series parallel structure coupling coefficient, series parallel structure coupling coefficient η _sPrepresent, have:

${\mathrm{\&eta;}}_{SP}=\frac{N_{SP}}{N}---\left(1\right)$

Wherein, N _sPrepresent the summation of series parallel structure interior joint degree, the summation of N representation module accumulator system corresponding Global-Coupling nodes degree;

For m cell first series mould set in series, the series parallel structure of n series mould set parallel connection afterwards, the summation N of series parallel structure interior joint degree _sPbe expressed as:

N _SP＝n(m-1)+n(n-1)(3)

The summation N of modularization accumulator system corresponding Global-Coupling nodes degree is expressed as:

$N=\frac{nm(nm-1)}{2}---\left(4\right).$

6. the modularization accumulator system extensive diagnostic method based on Complex Networks Theory according to claim 5, it is characterized in that: in described step 3-2, under the second mode of extension, the expansion evaluation index of modularization accumulator system is and cascaded structure coupling coefficient, and cascaded structure coupling coefficient η _pSrepresent, have:

${\mathrm{\&eta;}}_{PS}=\frac{N_{PS}}{N}---\left(5\right)$

Wherein, N _pSrepresent and the summation of cascaded structure interior joint degree;

For the first formation in parallel of n cell module in parallel, the also cascaded structure of m module series connection in parallel afterwards, and the summation N of cascaded structure interior joint degree _pSbe expressed as:

$N_{PS}=m\frac{n(n-1)}{2}+n^2(m-1)---\left(6\right).$