CN105023192A - Power system source-grid-load interaction control strategy evaluation method - Google Patents

Abstract

The invention relates to a power system source-grid-load interaction control strategy evaluation method comprising the following steps: acquiring power information and natural power characteristics of a power source side, a grid side and a load side of a power system, analyzing the interaction behavior characteristic of power equipment, and establishing a power system interaction resource structure; analyzing the response characteristics of interaction resources to electricity price, incentive and scheduling interaction mechanisms, and establishing power variation curves of the interaction resources under different interaction mechanisms; determining the interaction potential of the interaction resources, and establishing an interaction cost variation curve of the interaction resources within the scope of interaction potential; determining the amount of interaction of the interaction resources under the three interaction mechanisms, selecting an interaction strategy combination which meets the demand of system power balancing and minimizes the total cost of interaction, and obtaining an interaction control scheme; and evaluating the interaction control scheme respectively from the aspects of response characteristic, effect of interaction, grid security and grid economy, and comprehensively evaluating the influence of the source-grid-load interaction control strategy to the grid and the interaction efficiency of the strategy. The limitation of single index is overcome.

Description

The interactive control strategy evaluation method of a kind of electric power system source-net-He

Technical field

The present invention relates to electric system theory, control theory and systemtheoretical interleaving techniques, be specifically related to the interactive control strategy evaluation method of a kind of electric power system source-net-He.

Background technology

Open interaction is one of key character of intelligent grid.Along with the fast development of new theory, new technology, new material, power supply, electrical network and load have all possessed flexible characteristic.The regenerative resource of randomness together with the flexible power supplys such as water power, gas turbine and water-storage to measurable, regulatable future development, the flexible load that can adapt to power grid regulation demand will be developed into the controlled conventional load of electrical network close friend and microgrid, energy storage, electric automobile, demand response etc., in electrical network, have the flexible controllable devices such as FACTS; Information interaction perfect, makes power supply, electrical network, load can not only the change of perception oneself state, can also know the comprehensive information of other individuality, for power supply, electrical network, load general interaction each other provides possibility simultaneously.Therefore, " source-net-He " interactive (good interaction each other of power supply, electrical network, load) is the important means that the following electrical network energy structure of reply is changed, and is also the certainty of following electrical network fast development.

" source-net-He " interactive core is power supply, coordination and interaction between load and electrical network three, by multiple interactive forms such as complementation in a steady stream, source net coordination, the interaction of net lotus and the interactions of source lotus, more economical, efficiently and safely to improve electric system mobile equilibrium ability.Conventional electric power system cloud gray model control model is that power supply trace load variations adjusts, and load is considered to passive, be close to rigidity.And under " source-net-He " mutual environment, power supply, electrical network and load have all possessed flexible characteristic, controllable burden also will become the important means of electrical network adjustment and new forms of energy of dissolving, and the existing control method of " generating follow load " can not adapt to the needs that future " source-net-He ", interaction ran.In addition, not yet there is rational index to evaluate " source-net-He " Mutual Impacts and interactive benefit at present, need the assessment indicator system setting up a set of opening to weigh the rationality of interactive control program.

Summary of the invention

For the deficiencies in the prior art, the object of this invention is to provide the interactive control strategy evaluation method of a kind of electric power system source-net-He, the present invention constructs assessment indicator system from response characteristic, interaction effect, electric network security and economy four aspects, overcome the limitation of single index, evaluation index can play the effect of following three aspects: one is the decision process instructing interactive control program, two is evaluate interactive benefit, and three is check from power grid security angle interactive control program.

The object of the invention is to adopt following technical proposals to realize:

The invention provides the interactive control strategy evaluation method of a kind of electric power system source-net-He, its improvements are, described method comprises the steps:

1) acquisition electric power system power source, electrical network and load three side power information and natural power characteristic thereof, analyzes the mutual-action behavior characteristic of power equipment, sets up electric system interactive resources structure;

2) analyze the response characteristic of interactive resources to electricity price, excitation and scheduling three kinds of interaction mechanisms, set up the changed power curve of interactive resources under different interaction mechanism;

3) determine the interactive potentiality of interactive resources, within the scope of interactive potentiality, set up the interaction scheduling cost change curve of interactive resources;

4) determine the interactive power variation of interactive resources under different electricity prices, excitation and scheduling three kinds of interaction mechanisms, select and meet system power requirement of balance and the combination of the interactive tactics of total interactive cost minimization, draw interactive control program;

5) evaluate from response characteristic, interaction effect, electric network security and economy four aspects interactive control program respectively, the interactive control strategy of comprehensive evaluation source-net-He is on the impact of electrical network and interactive benefit.

Further, in described step 1), mains side comprises conventional water, thermoelectricity, wind energy, sun power regenerative resource, and load side comprises conventional load, the energy storage of load side, the flexible controllable burden of electric automobile, and grid side comprises the flexible equipment for power transmission and distribution of FACTS; Following electrical network all possesses flexible characteristic due to power supply, electrical network and load, will form comprehensive source-net-He interactive, presents complementation in a steady stream, source net is coordinated, net lotus is interactive and the interactive multiple interactive mode of source lotus.

Further, described step 2) in, first analyze each interactive resources and whether respond electricity price, excitation and scheduling three kinds of interaction mechanisms, then, set up the powertrace of its electric power with electricity price, excitation and the change of scheduling three kinds of interaction mechanisms for each class interactive resources;

During response Price Mechanisms, assuming that electric power P and electricity price p is linear, factor alpha and β are determined in the change according to interactive front and back electric power, electricity price, as the formula (1):

P＝αp+β P∈[P _min,P _max] （1）；

During responsing excitation mechanism, the variable quantity of power by load and dispatching center sign a contract in Load Regulation capacity Δ P determine; It is a process (0,1) that electric power P and regulating power Δ P closes, and slope is the straight line of 1, as the formula (2):

P＝P ₀+ΔP P∈[P _min,P _max] （2）；

During response scheduling mechanism, the variable quantity of power is directly by schedule power P _ddetermine, power P and schedule power P _drelation as the formula (3):

P＝P ₀+P _DP∈[P _min,P _max] （3）。

Further, in described step 3), the interactive potentiality of interactive resources refer to the maximum capacity that the interactive rear power of certain moment all kinds of interactive resources participation increases or reduces, and the maximum magnitude fluctuated by the interactive rear overall power of certain moment participation and the ratio of natural power represent; Wherein, upwards the ratio of domain of walker and natural power is called the interactive potentiality of forward, and the ratio of downward domain of walker and natural power is called reverse interactive potentiality; Interactive resources scheduling cost refers to the extraneous expense that interactive resources produces because participating in interaction.

Further, in described step 5), set up the characteristic index that response characteristic, interaction effect, electric network security are corresponding with economy, comprising: response characteristic index, interaction effect index, electric network security index and economic index.

Further, described response characteristic index comprises interactive potentiality, the interactive amount of responsiveness and unit of interactive resources;

1. interactive potentiality: represent the maximum capacity that certain moment all kinds of interactive resources participates in interactive rear power increase or reduces, its calculation expression is as follows:

In formula, P _i-max(t), P _i-min(t) and P _i-0t () is respectively the accessible peak power of t i-th class interactive resources, minimum power and initial natural performance number;

2. responsiveness: represent that certain moment all kinds of interactive resources participates in interactive real standard, calculation expression is:

$I_i\left(t\right)=\frac{\mathrm{\Δ}{P}_i\left(t\right)}{P_{i-0}\left(t\right)\·{\mathrm{Pot}}_i\left(t\right)},i=1...n---\left(5\right);$

In formula, Δ P _it actual interaction amount that () is t i-th class interactive resources, wherein, Δ P _i(t)=P _i(t)-P _i-0(t), P _it () is the real power value of t i-th class interactive resources;

3. unit interaction amount: the power variation of unit natural power after interaction representing all kinds of interactive resources, its calculation expression is:

ξ _i(t)＝Pot _i(t)×I _i(t) （6）；

Interactive resources participates in interactive rear power variation Δ P _it () is expressed as:

ΔP _i(t)＝P _i-0(t)×ξ _i(t) （7）。

Further, described interaction effect index comprises peak-valley difference change ratio, participates in interactive contribution ratio and regenerative resource fluctuation support level;

A, peak-valley difference change ratio: represent situation of change when interactive rear electric system peak-valley difference is interactive compared with nothing, its calculation expression is:

$H_{p-v}=(C_{p-v}-{\hat{C}}_{p-v})/C_{p-v}---\left(8\right);$

In formula, to be respectively in certain period of supervision (as 1 day) interactive before electric system peak-valley difference after electric system peak-valley difference and interaction;

B, participation interactive contribution ratio: represent the ratio that the interactive power of certain moment all kinds of interactive resources is shared in the total interactive power of electric system, its calculation expression is:

$H_i\left(t\right)={\mathrm{\ΔP}}_i\left(t\right)/\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{\Δ}{P}_i\left(t\right)---\left(9\right);$

In formula, Δ P _it actual interaction amount that () is t i-th class interactive resources, n is total classification of interactive resources;

C, regenerative resource fluctuation support level: represent the ability of being dissolved by interaction raising regenerative resource, its calculation expression is:

$C_{\mathrm{RE}}\left(t\right)=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{\Δ}{P}_i\left(t\right)}{\mathrm{\Δ}{P}_{\mathrm{RE}}\left(t\right)}---\left(10\right);$

In formula, Δ P _rEfor the undulate quantity of a certain class regenerative resource.

Further, described electric network security index comprises power grid heavy-load rate level, electrical network out-of-limit rate level and interactive trend entropy;

A, power grid heavy-load rate level: the heavily loaded rate situation describing interactive rear circuit, in order to reflect the degree of electric power netting safe running, its calculation expression is:

$\mathrm{LF}\left(t\right)=\frac{N_{\mathrm{LF}}}{K}\×100\%---\left(11\right);$

In formula, N _lFrepresent that line load rate exceedes the circuit number of setting threshold value, K represents total circuitry number;

The out-of-limit rate level of b, electrical network:

Represent that the situation that line power is out-of-limit appears in interactive rear system, its calculation expression is:

$\mathrm{LR}\left(t\right)=\frac{N_{\mathrm{LR}}}{K}\×100\%---\left(12\right);$

In formula, N _lRrepresent out-of-limit circuit number;

C, interactive trend entropy:

Represent the line load rate distribution situation of interactive rear electric system, its calculation expression is:

$\mathrm{EI}\left(t\right)=\frac{-C\underset{j=1}{\overset{J-1}{\mathrm{\Σ}}}{P}_j^t\ln P_j^t}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\ΔP}}_i\left(t\right)}---\left(13\right);$

In formula, represent the ratio number of lines in different loads rate interval being carried out to randomization, J-1 represents load factor interval number, and C is constant, Δ P _it actual interaction amount that () is t i-th class interactive resources, n is total classification of interactive resources.

Further, described economic index comprises interactive resources scheduling cost, represents the extraneous expense that interactive resources produces because participating in interaction, for the interactive resources consuming electric energy, calculation expression is as shown in (14), and for the interactive resources producing electric energy, calculation expression is as shown in (15):

C _k＝P ₀×p ₀-P×p+C _B（14）；

C _k＝P×p-P ₀×p ₀+C _B（15）；

In formula, P ₀the power that interactive resources participates in interactive front and back is respectively, p with P ₀with the electricity price that p is the interactive front and back of interactive resources participation, C _bfor fixed cost;

Control center is with total interactive cost minimization for principle scheduling participates in interactive controllable resources, and calculation expression is:

IC＝min(ΣC _k) （16）。

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

1, the interactive control strategy evaluation method of a kind of electric power system source provided by the invention-net-He, based on the interaction mechanisms such as electricity price, excitation and scheduling guide power supply, electrical network and load three the controllable resources of side carry out interaction and control.In order to carry out operative constraint and evaluation to interactive control program, the present invention constructs a set of index system from response characteristic, interaction effect, electric network security and economy four aspects, build index there is explicit physical meaning, easy to operate, the comprehensive and feature of easily expansion, and the effect of following three aspects can be played: one is the decision process instructing interactive control program, two is evaluate interactive benefit, and three is check from power grid security angle interactive control program.

2, the present invention put forward the active digestion capability that interactive control strategy evaluation method is conducive to improving electric system energy equilibrium ability and regenerative resource under following grid sources-net-He mutual environment, and can for the safety and stability of electric system, Quality and economy runs provide judging basis.

Accompanying drawing explanation

Fig. 1 is the interactive control flow chart of electric power system source-net-He of foundation provided by the invention;

Fig. 2 is that the interactive control strategy of source provided by the invention-net-He evaluates schematic diagram;

Fig. 3 is that specific embodiment provided by the invention adopts IEEE39 node 10 machine system to be pilot system figure.

Embodiment

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

The invention provides the interactive control strategy evaluation method of a kind of electric power system source-net-He, comprise the steps:

1) acquisition electric power system power source, electrical network and load three side power information and natural power characteristic thereof, analyzes the mutual-action behavior characteristic of power equipment, sets up electric system interactive resources structure;

Mains side comprises conventional water, thermoelectricity, wind energy, sun power regenerative resource, and load side comprises conventional load, the energy storage of load side, the flexible controllable burden of electric automobile, and grid side comprises the flexible equipment for power transmission and distribution of FACTS; Following electrical network all possesses flexible characteristic due to power supply, electrical network and load, will form comprehensive source-net-He interactive, presents complementation in a steady stream, source net is coordinated, net lotus is interactive and the interactive multiple interactive mode of source lotus.

2) response characteristic of each interactive resources to electricity price, excitation and scheduling three kinds of interaction mechanisms is analyzed, first analyze each interactive resources and whether respond electricity price, excitation and scheduling three kinds of interaction mechanisms, then adopt curve-fitting method, set up the power knots modification after interaction respectively with the powertrace of three kinds of interaction mechanism changes for each class interactive resources.

During response Price Mechanisms, assuming that electric power P and electricity price p is linear, factor alpha and β are determined in the change according to interactive front and back electric power, electricity price, as the formula (1):

P＝αp+β P∈[P _min,P _max] （1）；

During responsing excitation mechanism, the variable quantity of power by load and dispatching center sign a contract in Load Regulation capacity Δ P determine; It is a process (0,1) that electric power P and regulating power Δ P closes, and slope is the straight line of 1, as the formula (2):

P＝P ₀+ΔP P∈[P _min,P _max] （2）；

During response scheduling mechanism, the variable quantity of power is directly by schedule power P _ddetermine, power P and schedule power P _drelation as the formula (3):

P＝P ₀+P _DP∈[P _min,P _max] （3）；

3) determine the interactive potentiality of interactive resources, within the scope of interactive potentiality, set up the interactive resources scheduling cost change curve of interactive resources; The interactive potentiality of interactive resources refer to the maximum capacity that the interactive rear power of certain moment all kinds of interactive resources participation increases or reduces, and the maximum magnitude fluctuated by the interactive rear overall power of certain moment participation and the ratio of natural power represent; Wherein, upwards the ratio of domain of walker and natural power is called the interactive potentiality of forward, and the ratio of downward domain of walker and natural power is called reverse interactive potentiality; Interactive resources scheduling cost refers to the extraneous expense that interactive resources produces because participating in interaction.

4) determine the power variation of interactive resources under different electricity prices, excitation and scheduling three kinds of interaction mechanisms, select and meet system power requirement of balance and the combination of the interactive tactics of total interactive cost minimization, draw interactive control program; The interactive control flow chart of electric power system source-net-He of foundation provided by the invention as shown in Figure 1.

5) evaluate from response characteristic, interaction effect, electric network security and economy four aspects to the interactive control program of gained respectively, the Mutual Impacts of comprehensive evaluation power supply, electrical network and load and interactive benefit.The interactive control strategy of source provided by the invention-net-He evaluates schematic diagram as shown in Figure 2.

Set up the characteristic index that response characteristic, interaction effect, electric network security are corresponding with economy, comprising: response characteristic index, interaction effect index, electric network security index and economic index.

One) response characteristic index comprises interactive potentiality, the interactive amount of responsiveness and unit of interactive resources;

1. interactive potentiality: represent the maximum capacity that certain moment all kinds of interactive resources participates in interactive rear power increase or reduces, its calculation expression is as follows:

In formula, P _i-max(t), P _i-min(t) and P _i-0t () is respectively the accessible peak power of t i-th class interactive resources, minimum power and initial natural performance number;

2. responsiveness: represent that certain moment all kinds of interactive resources participates in interactive real standard, calculation expression is:

$I_i\left(t\right)=\frac{\mathrm{\Δ}{P}_i\left(t\right)}{P_{i-0}\left(t\right)\·{\mathrm{Pot}}_i\left(t\right)},i=1...n---\left(5\right);$

In formula, Δ P _it actual interaction amount that () is t i-th class interactive resources, wherein, Δ P _i(t)=P _i(t)-P _i-0(t), P _it () is the real power value of t i-th class interactive resources;

3. unit interaction amount: the power variation of unit natural power after interaction representing all kinds of interactive resources, its calculation expression is:

ξ _i(t)＝Pot _i(t)×I _i(t) （6）；

Interactive resources participates in interactive rear power variation Δ P _it () is expressed as:

ΔP _i(t)＝P _i-0(t)×ξ _i(t) （7）。

Two) interaction effect index comprises peak-valley difference change ratio, participates in interactive contribution ratio and regenerative resource fluctuation support level;

A, peak-valley difference change ratio: represent situation of change when interactive rear electric system peak-valley difference is interactive compared with nothing, its calculation expression is:

$H_{p-v}=(C_{p-v}-{\hat{C}}_{p-v})/C_{p-v}---\left(8\right);$

In formula, to be respectively in certain period of supervision (as 1 day) interactive before electric system peak-valley difference after electric system peak-valley difference and interaction;

B, participation interactive contribution ratio: represent the ratio that the interactive power of certain moment all kinds of interactive resources is shared in the total interactive power of electric system, its calculation expression is:

$H_i\left(t\right)={\mathrm{\ΔP}}_i\left(t\right)/\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{\Δ}{P}_i\left(t\right)---\left(9\right);$

In formula, Δ P _it actual interaction amount that () is t i-th class interactive resources, n is total classification of interactive resources;

C, regenerative resource fluctuation support level: represent the ability of being dissolved by interaction raising regenerative resource, its calculation expression is:

$C_{\mathrm{RE}}\left(t\right)=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{\Δ}{P}_i\left(t\right)}{\mathrm{\Δ}{P}_{\mathrm{RE}}\left(t\right)}---\left(10\right);$

In formula, Δ P _rEfor the undulate quantity of a certain class regenerative resource.

Three) electric network security index comprises power grid heavy-load rate level, electrical network out-of-limit rate level and interactive trend entropy;

A, power grid heavy-load rate level

Describe the heavily loaded rate situation of interactive rear circuit, in order to reflect the degree of electric power netting safe running, its calculation expression is:

$\mathrm{LF}\left(t\right)=\frac{N_{\mathrm{LF}}}{K}\×100\%---\left(11\right);$

In formula, N _lFrepresent that line load rate exceedes the circuit number of setting threshold value, K represents total circuitry number;

B, electrical network out-of-limit rate level: represent that the situation that line power is out-of-limit appears in interactive rear system, its calculation expression is:

$\mathrm{LR}\left(t\right)=\frac{N_{\mathrm{LR}}}{K}\×100\%---\left(12\right);$

In formula, N _lRrepresent out-of-limit circuit number;

C, interactive trend entropy: the line load rate distribution situation representing interactive rear electric system, its calculation expression is:

$\mathrm{EI}\left(t\right)=\frac{-C\underset{j=1}{\overset{J-1}{\mathrm{\Σ}}}{P}_j^t\ln P_j^t}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\ΔP}}_i\left(t\right)}---\left(13\right);$

In formula, represent the ratio number of lines in different loads rate interval being carried out to randomization, J-1 represents load factor interval number, and C is constant, Δ P _it actual interaction amount that () is t i-th class interactive resources, n is total classification of interactive resources.

Four) economic index comprises interactive resources scheduling cost, represent the extraneous expense that interactive resources produces because participating in interaction, for the interactive resources consuming electric energy, calculation expression is as shown in (14), for the interactive resources producing electric energy, calculation expression is as shown in (15):

C _k＝P ₀×p ₀-P×p+C _B（14）；

C _k＝P×p-P ₀×p ₀+C _B（15）；

In formula, P ₀the power that interactive resources participates in interactive front and back is respectively, p with P ₀with the electricity price that p is the interactive front and back of interactive resources participation, C _bfor fixed cost;

Control center is with total interactive cost minimization for principle scheduling participates in interactive controllable resources, and calculation expression is:

IC＝min(ΣC _k) （16）。

Comprehensively above-mentioned four class evaluation indexes, assess the rationality of the interactive control program of source-net-He all sidedly.

Embodiment

The embodiment of the present invention adopts IEEE39 node 10 machine system to be pilot system, as shown in Figure 3.If 30,31,32,33,34,35,36,37 nodes are conventional fired power generating unit, 38,39 nodes are the concentrated access point of wind-powered electricity generation, and node 3,4,7,8,12,15,16,18,20,21,22,24,25,26,27,28,29,31,39 is load bus.Be two regions by system divides, the type of each region internal loading is different with response characteristic simultaneously.Region 1 is set to typical business and residential block, comparatively responsive to electricity price, belong to price sensitive volume, responding electricity price type load proportion in region 1 is 40%, and elasticity coefficient is-0.2, interactive potentiality scope is [-50%, 50%], responsing excitation type load proportion is 20%, and interactive potentiality scope is [-50%, 50%], the remaining 40% rigidity load that can not be conditioned for power; Region 2 is set to typical industrial load district, not too responsive to electricity price, belong to price dead band, responding electricity price type load proportion in region 1 is 20%, and elasticity coefficient is-0.05, interactive potentiality scope is [-50%, 50%], responsing excitation type load proportion is 40%, and interactive potentiality scope is [-50%, 50%], the remaining 40% rigidity load that can not be conditioned for power.In example of the present invention, operation simulation center participates in interactive by electricity price signal guidance flexible load, electricity price range of adjustment is 0.4-1.6pu.

Table 1 is the interaction effect evaluation of wind-powered electricity generation flexible load under [-50%, 50%] fluctuating level.Can find out, wind-powered electricity generation is [-30%, when 30%] fluctuating in scope, the electricity price signal fluctuation amplitude that dispatching center issues is less, flexible load is 100% to wind-powered electricity generation fluctuation support level, illustrate that now utilizing price to respond can realize fully dissolving of wind-powered electricity generation completely, to region 1 responsiveness of electricity price sensitivity, comparatively region 2 is larger.But along with wind-powered electricity generation fluctuating range increases (more than 40%), unbalanced power amount in system increases, the responsiveness of the flexible load in this time domain 1 reaches 100%, dispatching center participates in interactive to dispatch sensitivity more weak region 2 load further, then need significantly to increase/reduce electricity price, and now flexible load, to wind-powered electricity generation fluctuation support level continuous decrease, needs take other interaction mechanism combine regulation or suitably abandon wind in this case.

The interaction effect evaluation of table 1 wind-powered electricity generation flexible load under [-50%, 50%] fluctuating level

After flexible load participates in interaction, wind-powered electricity generation forward surge limit is 38%, and reverse surge limit is-44%, respectively comparatively than improve 6%(forward before interaction) and-15%(reverse), now, it is 71.1% that electrical network forward bears interaction capability, and oppositely bearing interaction capability is-75.6%.From this analysis result, even if flexible load exists certain interactive potentiality, because the restriction of power system security constraints also cannot realize totally linearization, dispatching center, when formulating load interactive tactics, needs the receiving ability taking into full account electrical network.

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, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.

Claims (9)

1. the interactive control strategy evaluation method of electric power system source-net-He, it is characterized in that, described method comprises the steps:

1) acquisition electric power system power source, electrical network and load three side power information and natural power characteristic thereof, analyzes the mutual-action behavior characteristic of power equipment, sets up electric system interactive resources structure;

2) analyze the response characteristic of interactive resources to electricity price, excitation and scheduling three kinds of interaction mechanisms, set up the changed power curve of interactive resources under different interaction mechanism;

3) determine the interactive potentiality of interactive resources, within the scope of interactive potentiality, set up the interaction scheduling cost change curve of interactive resources;

4) determine the interactive power variation of interactive resources under different electricity prices, excitation and scheduling three kinds of interaction mechanisms, select and meet system power requirement of balance and the combination of the interactive tactics of total interactive cost minimization, draw interactive control program;

5) evaluate from response characteristic, interaction effect, electric network security and economy four aspects interactive control program respectively, the interactive control strategy of comprehensive evaluation source-net-He is on the impact of electrical network and interactive benefit.

2. the interactive control strategy evaluation method of electric power system source-net-He as claimed in claim 1, it is characterized in that, in described step 1), mains side comprises conventional water, thermoelectricity, wind energy, sun power regenerative resource, load side comprises conventional load, the energy storage of load side, the flexible controllable burden of electric automobile, and grid side comprises the flexible equipment for power transmission and distribution of FACTS; Following electrical network all possesses flexible characteristic due to power supply, electrical network and load, will form comprehensive source-net-He interactive, presents complementation in a steady stream, source net is coordinated, net lotus is interactive and the interactive multiple interactive mode of source lotus.

3. the interactive control strategy evaluation method of electric power system source-net-He as claimed in claim 1, it is characterized in that, described step 2) in, first analyze each interactive resources and whether respond electricity price, excitation and scheduling three kinds of interaction mechanisms, then, the powertrace of its electric power with electricity price, excitation and the change of scheduling three kinds of interaction mechanisms is set up for each class interactive resources;

During response Price Mechanisms, assuming that electric power P and electricity price p is linear, factor alpha and β are determined in the change according to interactive front and back electric power, electricity price, as the formula (1):

P＝αp+β P∈[P _min,P _max] （1）；

During responsing excitation mechanism, the variable quantity of power by load and dispatching center sign a contract in Load Regulation capacity Δ P determine; It is a process (0,1) that electric power P and regulating power Δ P closes, and slope is the straight line of 1, as the formula (2):

P＝P ₀+ΔP P∈[P _min,P _max] （2）；

During response scheduling mechanism, the variable quantity of power is directly by schedule power P _ddetermine, power P and schedule power P _drelation as the formula (3):

P＝P ₀+P _DP∈[P _min,P _max] （3）。

4. the interactive control strategy evaluation method of electric power system source-net-He as claimed in claim 1, it is characterized in that, in described step 3), the interactive potentiality of interactive resources refer to the maximum capacity that the interactive rear power of certain moment all kinds of interactive resources participation increases or reduces, and the maximum magnitude fluctuated by the interactive rear overall power of certain moment participation and the ratio of natural power represent; Wherein, upwards the ratio of domain of walker and natural power is called the interactive potentiality of forward, and the ratio of downward domain of walker and natural power is called reverse interactive potentiality; Interactive resources scheduling cost refers to the extraneous expense that interactive resources produces because participating in interaction.

5. the interactive control strategy evaluation method of electric power system source-net-He as claimed in claim 1, it is characterized in that, in described step 5), set up the characteristic index that response characteristic, interaction effect, electric network security are corresponding with economy, comprising: response characteristic index, interaction effect index, electric network security index and economic index.

6. the interactive control strategy evaluation method of electric power system source-net-He as claimed in claim 5, is characterized in that, described response characteristic index comprises interactive potentiality, the interactive amount of responsiveness and unit of interactive resources;

1. interactive potentiality: represent the maximum capacity that certain moment all kinds of interactive resources participates in interactive rear power increase or reduces, its calculation expression is as follows:

In formula, P _i-max(t), P _i-min(t) and P _i-0t () is respectively the accessible peak power of t i-th class interactive resources, minimum power and initial natural performance number;

2. responsiveness: represent that certain moment all kinds of interactive resources participates in interactive real standard, calculation expression is:

$I_i\left(t\right)=\frac{\mathrm{\Δ}{P}_i\left(t\right)}{P_{i-0}\left(t\right)\·{\mathrm{Pot}}_i\left(t\right)},i=1...n---\left(5\right);$

In formula, Δ P _it actual interaction amount that () is t i-th class interactive resources, wherein, Δ P _i(t)=P _i(t)-P _i-0(t), P _it () is the real power value of t i-th class interactive resources;

3. unit interaction amount: the power variation of unit natural power after interaction representing all kinds of interactive resources, its calculation expression is:

ξ _i(t)＝Pot _i(t)×I _i(t) （6）；

Interactive resources participates in interactive rear power variation Δ P _it () is expressed as:

ΔP _i(t)＝P _i-0(t)×ξ _i(t) （7）。

7. electric power system source as claimed in claim 5-net-He interaction control strategy evaluation method, it is characterized in that, described interaction effect index comprises peak-valley difference change ratio, participates in interactive contribution ratio and regenerative resource fluctuation support level;

A, peak-valley difference change ratio: represent situation of change when interactive rear electric system peak-valley difference is interactive compared with nothing, its calculation expression is:

$H_{p-v}=(C_{p-v}-{\hat{C}}_{p-v})/C_{p-v}---\left(8\right);$

In formula, to be respectively in certain period of supervision interactive before electric system peak-valley difference after electric system peak-valley difference and interaction;

B, participation interactive contribution ratio: represent the ratio that the interactive power of certain moment all kinds of interactive resources is shared in the total interactive power of electric system, its calculation expression is:

$H_i\left(t\right)={\mathrm{\ΔP}}_i\left(t\right)/\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{\Δ}{P}_i\left(t\right)---\left(9\right);$

In formula, Δ P _it actual interaction amount that () is t i-th class interactive resources, n is total classification of interactive resources;

C, regenerative resource fluctuation support level: represent the ability of being dissolved by interaction raising regenerative resource, its calculation expression is:

$C_{\mathrm{RE}}\left(t\right)=\frac{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}\mathrm{\Δ}{P}_i\left(t\right)}{\mathrm{\Δ}{P}_{\mathrm{RE}}\left(t\right)}---\left(10\right);$

In formula, Δ P _rEfor the undulate quantity of a certain class regenerative resource.

8. the interactive control strategy evaluation method of electric power system source-net-He as claimed in claim 5, it is characterized in that, described electric network security index comprises power grid heavy-load rate level, electrical network out-of-limit rate level and interactive trend entropy;

A, power grid heavy-load rate level: the heavily loaded rate situation describing interactive rear circuit, in order to reflect the degree of electric power netting safe running, its calculation expression is:

$\mathrm{LF}\left(t\right)=\frac{N_{\mathrm{LF}}}{K}\×100\%---\left(11\right);$

In formula, N _lFrepresent that line load rate exceedes the circuit number of setting threshold value, K represents total circuitry number;

The out-of-limit rate level of b, electrical network:

Represent that the situation that line power is out-of-limit appears in interactive rear system, its calculation expression is:

$\mathrm{LR}\left(t\right)=\frac{N_{\mathrm{LR}}}{K}\×100\%---\left(12\right);$

In formula, N _lRrepresent out-of-limit circuit number;

C, interactive trend entropy:

Represent the line load rate distribution situation of interactive rear electric system, its calculation expression is:

$\mathrm{EI}\left(t\right)=\frac{-C\underset{j=1}{\overset{J-1}{\mathrm{\Σ}}}{P}_j^t\ln P_j^t}{\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\ΔP}}_i\left(t\right)}---\left(13\right);$

In formula, represent the ratio number of lines in different loads rate interval being carried out to randomization, J-1 represents load factor interval number, and C is constant, Δ P _it actual interaction amount that () is t i-th class interactive resources, n is total classification of interactive resources.

9. the interactive control strategy evaluation method of electric power system source-net-He as claimed in claim 5, it is characterized in that, described economic index comprises interactive resources scheduling cost, represent the extraneous expense that interactive resources produces because participating in interaction, for the interactive resources consuming electric energy, calculation expression is as shown in (14), and for the interactive resources producing electric energy, calculation expression is as shown in (15):

C _k＝P ₀×p ₀-P×p+C _B（14）；

C _k＝P×p-P ₀×p ₀+C _B（15）；

In formula, P ₀the power that interactive resources participates in interactive front and back is respectively, p with P ₀with the electricity price that p is the interactive front and back of interactive resources participation, C _bfor fixed cost;

Control center is with total interactive cost minimization for principle scheduling participates in interactive controllable resources, and calculation expression is:

IC＝min(ΣC _k) （16）。