CN106384162A - Electric power system electric energy-standby optimization scheduling method considering partition standby and N-1 verification - Google Patents

Abstract

The present invention discloses an electric power system electric energy-standby optimization scheduling method considering partition standby and N-1 verification. Therefore, a combined optimization model having maximum electric energy and standby cost and considering the partition standby is established. An initial preconceive accident N-1 safety constraint is added into the optimization model, an initial scheduling scheme is obtained through solution, the transmission lines in each partition is subjected to N-1 verification, if the verification passes, the scheme is the optimization scheduling scheme of the next time, if the verification does not pass, the corresponding N-1 verification format is added into the optimization scheduling model to solve and obtain a new scheduling scheme, and the verification mentioned above is repeatedly performed until all the transmission lines pass the N-1 verification so as to obtain the final optimization scheduling scheme. The electric power system electric energy-standby optimization scheduling method considering the partition standby and the N-1 verification is helpful for ensuring the safety of the electric power and the validity of the standby so as to realize the resource optimization configuration.

Description

Consider zonal reserve and the power system electric energy-standby joint optimal operation of N-1 verification Method

Technical field

The present invention relates to a kind of power system optimal dispatch method under electricity market, more particularly to examine under electricity market Consider zonal reserve and the power system electric energy-standby joint optimal operation method of N-1 verification.

Background technology

Generation schedule refers to according to load prediction, on the premise of meeting power-balance, in conjunction with each unit output bound, The constraintss such as each unit maximum climbing power are it is considered to the actual conditions such as the start and stop of each unit and minimum downtime, and carry The generated output of each unit of front layout, formulates the important process that generation schedule is electric power system dispatching department.Generate electricity formulating While plan, need to arrange certain spare capacity to tackle various uncertain factors, such as load fluctuation, generating set Forced outage and electric network fault etc., thus safeguard the safe and stable operation of electrical network, it is to avoid cutting load causes to damage to power consumer Lose.In country variant and area, the standby classification of electrical network is different, but according to standby purposes, can be generally divided into tune Save standby and spinning reserve two big class, wherein, adjust the standby load fluctuation being mainly used in Fast-Balance electrical network, and spinning reserve After the main generation in power grid accident, for making up the active vacancy that accident causes.Generally, the spare capacity that electrical network is bought More, the power supply reliability of system is higher；But if the spare capacity bought is excessive, generation assets can be caused to waste, impact The economy of electrical network.In March, 2015, the Central Committee of the Communist Party of China, State Council issue《With regard to deepening some of power system reform further Suggestion》(i.e. " No. 9 literary compositions ") opens the gate that new round electricity changes, and it is issued means that China Power system occurs key changing Become.The final purpose of power system reform is to realize the high-efficient disposition of resource, safe and clean, reliably meet whole society's electricity consumption Demand.Therefore, while ensureing electric network security and economy, how reasonably to arrange generation schedule and configure standby appearance Amount, becomes the key issue of electric power system dispatching department urgent need to resolve.

In view of electric energy and standby between there is coupled relation, in recent years, Foreign Electricity Markets in operative practice gradually Trend towards a few days ago, in Real-time markets using the method for electric energy-standby combined dispatching, the optimization that resource can be better achieved is joined Put.In conventional electric energy-standby combined scheduling method, typically with economy optimum as object function it is considered to power-balance, send out The restriction of motor climbing rate, the constraints such as line transmission capacity limit, spare capacity minimum essential requirement, to electric energy and standby Close and optimize, to obtain the scheduling scheme of network minimal.Due to standby, the security and power supply reliability of safeguarding electrical network are played Vital effect, therefore Chinese scholars are studied to standby Optimal Configuration Method from different perspectives, mainly examine Consider the difference factor such as mains frequency recovery, reliability assessment, interconnected network characteristic, forecast accident.

In existing electric energy-standby combined scheduling method, standby generally only need to meet the standby minimum essential requirement amount of the whole network be Can.But, in actual electric network, due to generation assets maldistribution, cost of electricity-generating gap larger it is possible to can lead to standby Capacity concentrates in a certain region.In view of line transmission capacity limitation and network congestion, it is possible that standby after accident occurs The phenomenon that can not called with capacity, has a strong impact on the safety and reliability of operation of power networks.Therefore, in order to standby after guarantee accident The validity of capacity, it is considered to zonal reserve minimum essential requirement amount is very important in electric energy-standby combined scheduling method.With This seldom carries out N-1 verification to circuit and transformer in current electric energy-standby combined scheduling method simultaneously, but in reality In electrical network, the N-1 into row line, transformer and generator is needed to verify thus meeting Network Security Constraints.Therefore, it is necessary to Consider zonal reserve and N-1 verification, propose a kind of new power system electric energy-standby joint optimal operation method, for electricity The work of net actual schedule provides reference.

Content of the invention

It is an object of the invention to provide a kind of power system electric energy-standby joint considering zonal reserve and N-1 verification Optimization Scheduling, the method, with economy optimum as target, considers zonal reserve constraint and the constraint of N-1 fault, to electricity simultaneously Combined optimization can be carried out with standby, thus obtaining rational scheduling scheme.

For achieving the above object, present invention employs technical scheme below：

Step 1：Determine system reserve minimum essential requirement amount and the zonal reserve minimum essential requirement of next scheduling slot regional power grid Amount；

Step 2：The electric energy bought with regional power grid and the minimum object function of standby total cost, are set up and consider zonal reserve The electric energy of demand-standby combined optimization model；

Step 3：The setting initial contingency set of N-1, exerts oneself in a upper scheduling slot including subregion interconnection and each subregion The N-1 fault of maximum generation machine, and the N-1 security constraint of initial forecast accident is added to above-mentioned steps 2 as constraints In gained Optimized model, the power system electric energy-standby joint optimal operation model of formation consideration zonal reserve and N-1 constraint is simultaneously Solution obtains initial schedule scheme；

Step 4：N-1 verification is carried out one by one to the transmission line within each subregion according to scheduling scheme

If the verification of certain transmission lines is passed through, continue to verify next transmission lines, if verification is not passed through, should The N-1 check formula of transmission line is added in step 3 gained Optimal Operation Model as constraints, obtains new Optimized Operation Model, obtains new scheduling scheme by solving this Optimal Operation Model, continues next biography of verification according to new scheduling scheme Defeated line；Repeat above-mentioned N-1 verification, until the N-1 verification of all transmission lines completes, then the scheduling scheme finally giving is next The Optimized Operation scheme of scheduling slot.

In described step 1, standby can be divided into the standby and spinning reserve of regulation, wherein adjust standby for quick suppression system The load fluctuation of system, is undertaken by AGC (Automatic Generation Control) units all in regional power grid, therefore only considers that system fading margin is standby Little demand, usesRepresent；Spinning reserve is mainly used in making up the active vacancy after accident occurs, by all in regional power grid Schedulable unit undertakes, and in order to ensure the security of standby deliverability and electrical network, needs to consider system spinning reserve simultaneously Minimum essential requirement amount and subregion spinning reserve minimum essential requirement amount, are expressed asWith Be taken as the whole network (refer to regional power grid, under The a% of total load together)；Determined by the b% of the whole network total load and the minimum of a value of the whole network maximum generation unit installed capacity；It is taken as the c% of each partition load；Coefficient a, b, c can select according to electrical network actual conditions.In addition system reserve and point The standby minimum essential requirement amount in area needs to obtain by off-line simulation.

In described step 2, the target of this Optimization Scheduling is that economy is optimum, and that is, the whole network is bought in scheduling slot Electric energy and standby total cost reach minimum, specific object function can be expressed as：

$min(\underset{i}{\overset{N_g}{\Σ}}{\mathrm{\α}}_i{P}_i+\underset{i}{\overset{N_a}{\Σ}}{\mathrm{\β}}_i(A_i^{+}+A_i^{-})+\underset{i}{\overset{N_g}{\Σ}}{\mathrm{\γ}}_i{R}_i)---\left(1\right)$

Wherein, P_iPlan for i-th generating set is exerted oneself,It is adjusted up the purchase of spare capacity for i-th AGC unit The amount of buying,Adjust downwards the purchase volume of spare capacity, R for i-th AGC unit_iFor i-th generating set spinning reserve capacity Purchase volume, α_i,β_i,γ_iRepresent i-th generating set electric energy respectively, adjust standby and spinning reserve quotation, unit is Yuan/ MW, N_gFor the sum of the whole network schedulable unit, N_aSum for the whole network AGC unit.

Consider that the electric energy-standby combined optimization model of zonal reserve demand includes power balance equation, generator output work Rate constraint, the constraint of generator climbing rate, the constraint of standby climbing rate, the constraint of system reserve minimum essential requirement amount, zonal reserve minimum need The amount of asking constraint and line transmission capacity-constrained, embody as follows：

1) power balance equation

$\underset{i=1}{\overset{N_g}{\Σ}}{P}_i=\underset{i=1}{\overset{N_d}{\Σ}}{D}_i---\left(2\right)$

Wherein, D_iRepresent the load of i-th node, N_dNodes for the whole network.

2) generated output power constraint

For all AGC units (A represents regional power grid AGC unit set)：

AndMeanwhile,And

Wherein, P_imaxFor i-th generating set maximum active exert oneself, P_iminMinimum technology for i-th generating set goes out Power, A_imaxAGC for i-th generating set adjusts the upper limit, A_iminAGC for i-th generating set adjusts lower limit.

For all schedulable non-AGC units (B represents the schedulable non-AGC unit collection of regional power grid Close)：

P_i+R_i≤P_imax(4)

3) generator climbing rate constraint

$-T\·r_i^{-}\≤P_i-P_{0i}\≤T\·r_i^{+}---\left(5\right)$

Wherein, P_0iFor the previous scheduling slot of i-th generating set of regional power grid active go out force value, can be from power grid energy Obtain in management system (EMS).

4) standby climbing rate constraint

And

Wherein,For the ratio of slope of climbing of i-th generating set of regional power grid,For i-th generating set of regional power grid Downward climbing rate, t₁For adjusting standby response time, t₂Response time for spinning reserve.

5) system reserve minimum essential requirement amount constraint

And

Constraints above condition shows the standby total amount of regulation that the whole network provides and spinning reserve total amount, and should to meet system fading margin standby With the minimum essential requirement amount with spinning reserve.

6) zonal reserve minimum essential requirement amount constraint

For each subregion z, have：

$\underset{i=1}{\overset{N_g^z}{\Σ}}{R}_i\≥D_R^z---\left(8\right)$

Wherein,Represent the number of units of schedulable unit in subregion z, this constraint shows, generating set institute in each subregion The spinning reserve providing should meet subregion spinning reserve minimum essential requirement amount.

7) line transmission capacity-constrained

For circuits all in electrical network：

$-P_{l_k\max }\≤P_{l_k}\≤P_{l_k\max },P_{l_k}=\underset{i=1}{\overset{N_g}{\Σ}}{H}_{ki}{P}_i-\underset{i=1}{\overset{N_d}{\Σ}}{H}_{ki}{D}_i---\left(9\right)$

Under ground state trend, in regional power grid, all line powers should meet the restriction of transmission capacity.Wherein,For kth Active power on bar circuit,For the maximum transfer capacity of kth bar circuit, H_kiShift distribution factor matrix H for power Row k i-th column element, represents the impact to kth bar circuit active power for the injecting power of i-th node.

N-1 accident set can be divided into two classes：One is system generator fault set, and another kind of is system communications line and transformation Device fault set.The fault set of this two class needs to consider different modeling pattern in Optimized model：After generator N-1 fault, system Power-balance be destroyed, need system reserve to recall and dispatched again, it is considered to generator is former therefore when Optimized model model After barrier, setting new variables is it is ensured that the feasibility of model；After circuit or transformer N-1 fault, the power-balance of system will not be broken Bad, therefore do not need system reserve to recall and dispatched again, it is considered to circuit or transformer fault therefore when Optimized model models Do not need afterwards to arrange new variables, Optimized Operation result can meet normal and failure condition constraints simultaneously.

After determining N-1 contingency set, the N-1 principle of circuit, transformer and generator is added to as constraints In Optimized model described in step 2, form the power system electric energy-standby considering zonal reserve and N-1 constraint under electricity market Joint optimal operation model.

However, this is a ultra-large optimization problem, actual motion is difficult to solve.Therefore can adopt and dynamically actively collect Method be iterated solve.The primary fault collection of setting iteration, wherein initial plant N-1 refers to that an important interconnection occurs Broken string, such as the interconnection between each subregion of electrical network；Initial generator N-1 refers to that the important generating set of each subregion breaks down Stop transport.Specifically, the constraints of circuit N-1 and generator N-1 is as follows：

1) circuit N-1 constraint

Article one, after anticipation circuit disconnects, the need for electricity in order to meet user ensures the security of electrical network simultaneously, at each Generating set exert oneself constant on the premise of, all circuits of the whole network still need to meet line transmission capacity-constrained.Assume m-th anticipation line Road N-1 fault occurs, then the topological structure of electrical network changes, and therefore power transfer distribution factor changes, and is calculated New power transfer distribution factor matrix H^m.Thus circuit N-1 constraint representation is as follows：

After m-th anticipation circuit N-1 fault occurs, for remaining circuit in regional power grid, have：

$-P_{l_k\max }\≤P_{l_k}^m\≤P_{l_k\max },P_{l_k}^{\max }=\underset{i=1}{\overset{N_g}{\Σ}}{H}_{ki}^m{P}_i-\underset{i=1}{\overset{N_d}{\Σ}}{H}_{ki}^m{D}_i---\left(10\right)$

Wherein,For m-th anticipation circuit N-1 fault occur rear region electrical network kth bar circuit on active power, Shift distribution factor matrix H for new power^mRow k i-th column element.

Because transformer can be expressed as the form of circuit in a model, therefore no longer individually list the N-1 of transformer about Bundle.

2) generator N-1 constraint

After n-th anticipation generator N-1 fault occurs, this generator failure is stopped transport it is impossible to continue to provide electric energy, tune It is active caused by generator N-1 to make up that the standby and spinning reserve of section, therefore remaining generating set of the whole network recall spinning reserve Vacancy.At this time, it may be necessary to ensure that all circuits of the whole network still need to meet line transmission capacity-constrained thus ensureing the peace of electrical network after fault Quan Xing.Embodying of generator N-1 constraint is as described below：

After n-th anticipation generator N-1 fault occurs：

$A_n^{+}=0,A_n^{-}=0,R_n=0$

Now, system fading margin standby minimum essential requirement amount and spinning reserve minimum essential requirement amount must meet, that is,：

And

Meanwhile, the spinning reserve total amount that remaining generating set of the whole network recalls should meet active power shortage：

$\underset{i=1,i\≠n}{\overset{N_g}{\Σ}}{R}_i^n=P_n---\left(12\right)$

Wherein,Represent that n-th anticipation generator N-1 fault occurs the rotation that rear i-th generating set should recall standby With its value is limited by this i-th generating set spinning reserve purchase volume, that is,：

$0\≤R_i^n\≤R_i---\left(13\right)$

Meanwhile, after spinning reserve recalls, the whole network circuit remains a need for meeting line transmission capacity-constrained：

$-P_{l_k\max }\≤P_{l_k}^n\≤P_{l_k\max },P_{l_k}^n=\underset{i=1,i\≠n}{\overset{N_g}{\Σ}}{H}_{ki}(P_i+R_i^n)-\underset{i=1}{\overset{N_d}{\Σ}}{H}_{ki}{D}_i---\left(14\right)$

Wherein,There is the active power on rear region electrical network kth bar circuit for n-th anticipation generator N-1 fault.

Afterwards, excellent according to the power system electric energy-standby joint of zonal reserve under above-mentioned consideration electricity market and N-1 constraint Change scheduling model, try to achieve the initial schedule scheme of next scheduling slot.

In described step 4, in order to ensure the security of operation of power networks, each point is carried out to step 3 gained initial schedule scheme The N-1 verification of area's internal transmission line.Assume that the u article subregion internal transmission line occurs N-1 fault, then power transfer distribution factor square Battle array is changed into H^u, on the basis of current scheduling scheme, in verification electrical network, whether remaining circuit meets line transmission appearance according to the following formula Amount constraint (meets then verification to pass through, be unsatisfactory for, verify and do not pass through)：

$-P_{l_k\max }\≤P_{l_k}^u\≤P_{l_k\max },P_{l_k}^u=\underset{i=1}{\overset{N_g}{\Σ}}{H}_{ki}^u{P}_i-\underset{i=1}{\overset{N_d}{\Σ}}{H}_{ki}^u{D}_i---\left(15\right)$

Wherein,There is the wattful power on N-1 fault rear region electrical network kth article circuit for the u article subregion internal transmission line Rate,Shift distribution factor matrix H for new power^uRow k i-th column element.

N-1 verification is carried out one by one to the transmission line within each subregion, if the verification of certain transmission line is passed through, continues verification Next transmission lines；If verification is not passed through, using the N-1 check formula (referring to formula 15) of this transmission line as constraints It is added in step 3 gained Optimal Operation Model, obtains new Optimal Operation Model, obtained by solving this Optimal Operation Model New scheduling scheme；Repeat above-mentioned N-1 verification, until the N-1 verification of all transmission lines is passed through, then obtain final Optimized Operation Scheme, returns EMS, and the dispatching of power netwoks for subsequent time provides reference.

Beneficial effects of the present invention are embodied in：

The present invention under conditions of considering zonal reserve minimum essential requirement amount and circuit, transformer and generator N-1 constraint, With the electricity bought and standby network minimal as target, combined optimization is carried out to electricity-standby, thus obtaining rational dispatching party So that electrical network overall economy quality more preferably, realizes distributing rationally of resource, N-1 verification simultaneously further ensures system operation to case Reliability, and provide certain reference to the traffic control of power system.

Brief description

Fig. 1 is the power system electric energy-standby joint optimal operation side considering zonal reserve and N-1 verification of the present invention Method flow chart；

Fig. 2 is the test sub-area division schematic diagram in the embodiment of the present invention；Heavy line between each subregion of in figure is subregion Interconnection, numeral 1～118 expression node serial number, G is generating set.

Specific embodiment

In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right The present invention is described in further detail.It should be appreciated that embodiment described herein, only in order to explain the present invention, is not used to limit Determine the present invention.

Below, the present invention is specifically introduced taking the joint optimal operation of certain test electrical network electric energy-standby as a example, but should It should be appreciated that invention is not limited thereto, it is applied equally to other electrical networks or power operation business are carried out electric energy and standby Joint optimal operation.

As shown in figure 1, the present invention provide electricity market under consider zonal reserve and N-1 verification power system electric energy- Standby joint optimal operation method, comprises the following steps：

The first step：Initial data needed for EMS obtains power system optimal dispatch, the main topology knot including electrical network Structure, partition information, the method for operation, alternator data, the scheduling scheme of a upper period and load prediction, for forming subsequent period Optimized Operation scheme prepare.In the present embodiment, using IEEE118 node system as test electrical network, 118 sections are comprised altogether Point, 186 circuits, and it is divided into 3 subregions, the network topology of test electrical network and subregion are as shown in Figure 2.

Second step：According to the scheduling scheme of load prediction, generating machine information, partition information and a upper period, determined and survey The examination system of electrical network and the minimum essential requirement amount of zonal reserve.Standby be divided into regulation standby and spinning reserve, in the present embodiment, be The minimum essential requirement amount of system and zonal reserve is all taken as a certain fixed percentage of load.Wherein, adjust standby and consider system Little demandIt is taken as the 2% of the whole network total load；Spinning reserve is divided into system minimum essential requirement amountWith subregion minimum essential requirement amountTake the 8% of the whole network total load and the minimum of a value of the whole network maximum generation unit installed capacity；It is taken as each subregion to bear The 8% of lotus.The standby minimum essential requirement of the predicted load, maximum generation unit installed capacity and system and subregion of test electrical network Amount, as shown in table 1.

Table 1. 118 node test network system, zonal reserve minimum essential requirement amount

3rd step：With the electric energy bought and the minimum object function of standby total cost (referring to formula 1), set up and consider point The standby electric energy in area-standby combined optimization model, including power balance equation (referring to formula 2), generated output power constraint (referring to formula 3～4), generator climbing rate constraint (referring to formula 5), standby climbing rate constraint (referring to formula 6), system reserve Minimum essential requirement amount constraint (referring to formula 7), zonal reserve minimum essential requirement amount constraint (referring to formula 8) and line transmission capacity-constrained (referring to formula 9).In the present embodiment, total generating set 54, wherein 9 is AGC unit, specifies each AGC unit simultaneously AGC adjust the upper limit be installed capacity 95%, AGC adjust lower limit be installed capacity 5%, i.e. A_imax=0.95P_imax,A_imin =0.05P_imax；Scheduling slot length T is set to 15 minutes, adjusts standby response time t₁It is set to 5 minutes, spinning reserve rings T between seasonable₂It is set to 10 minutes；Each generating set climbing rate up and down is equal, that is,

4th step：Setting N-1 contingency set, mainly includes the interconnection of each by stages and each subregion in the present embodiment There is N-1 fault in interior important generating set.In test electrical network, the interconnection of each by stages totally 12；Weight in each subregion Generating set is wanted to refer to that a upper scheduling slot in this subregion is exerted oneself the generating set of maximum, understands on each subregion according to EMS data One scheduling slot exert oneself maximum generating set.After determining N-1 contingency set, by the N-1 constraints of forecast accident (referring to Formula 10～14) add in above-mentioned Optimized model, form the power system electric energy-standby considering zonal reserve and N-1 constraint Joint optimal operation model.

5th step：Solve above-mentioned Optimal Operation Model using Matlab and Cplex, be met the initial schedule side of constraint Case, that is, obtain P_i、And R_iInitial optimal value.

6th step：Initial schedule scheme is carried out with the N-1 verification of each subregion internal transmission line.In test electrical network, each point Area's internal transmission line totally 174 (wherein comprises to be expressed as the transformer of circuit).Transmission line within each subregion is carried out one by one N-1 verifies, if certain transmission lines meets N-1 verification, continues to verify next transmission lines；If be unsatisfactory for, this is passed The N-1 check formula (referring to formula 15) of defeated line is added in Optimal Operation Model as constraints, obtains new optimization and adjusts Degree model simultaneously solves and obtains new scheduling scheme, new scheduling scheme is repeated with above-mentioned checking procedure (by will be not validated The corresponding check formula of transmission line add up in step 4 gained Optimal Operation Model so that under new scheduling scheme The transmission line of verification all only can need under new scheduling scheme to continue verification to the transmission line not verified by verification, therefore), directly N-1 verification to all transmission lines is passed through, the Optimized Operation scheme of scheduling scheme as subsequent time now.

Eventually through Matlab and Cplex software, solve the Optimized Operation side being met zonal reserve and N-1 verification Case, and the electric energy bought and minimum 897814.84 yuan of standby expense, specifically, buy electric energy, adjust standby and rotation Standby expense is as shown in table 2.

Every buying expenses of table 2. final optimization pass scheduling scheme

According to optimum results, electric energy that each subregion should be bought, to adjust standby and spinning reserve capacity as shown in table 3.

The final optimum results of each subregion of table 3

Table 3 and table 1 are contrasted and understands, the Optimized Operation scheme finally giving can meet workload demand, meet complete simultaneously Net and the standby minimum essential requirement amount of each subregion.Therefore, this Optimized Operation scheme is meeting zonal reserve requirement, N-1 verification It is achieved that economy is optimum, be conducive to distributing rationally of resource Deng on the basis of security constraint.

7th step：The Optimized Operation finally giving scheme is returned EMS, the dispatching of power netwoks for subsequent period provides reference.

Claims (8)

1. consider zonal reserve and N-1 verification power system electric energy-standby joint optimal operation method it is characterised in that：Bag Include following steps：

Step 1：Determine system reserve minimum essential requirement amount and each subregion in this regional power grid of next scheduling slot regional power grid Zonal reserve minimum essential requirement amount；

Step 2：The electric energy bought with regional power grid and the minimum object function of standby total cost, are set up and consider zonal reserve demand Electric energy-standby combined optimization model；

Step 3：The setting initial contingency set of N-1, and the N-1 security constraint of initial forecast accident is added as constraints To in step 2 gained Optimized model, formed and consider that the power system electric energy-standby combined optimization of zonal reserve and N-1 constraint is adjusted Degree model, obtains initial schedule scheme by solving this Optimal Operation Model；The initial contingency set of described N-1 includes subregion connection Winding thread N-1 fault and each subregion are exerted oneself in a upper scheduling slot N-1 fault of maximum generation unit；

Step 4：N-1 verification is carried out one by one to the transmission line within each subregion according to scheduling scheme

If the verification of certain transmission lines is passed through, continue to verify next transmission lines, if verification is not passed through, this is transmitted The N-1 check formula of line is added in step 3 gained Optimal Operation Model as constraints, obtains new Optimized Operation mould Type, obtains new scheduling scheme by solving this Optimal Operation Model, continues next transmission of verification according to new scheduling scheme Line；Repeat above-mentioned N-1 verification, until the N-1 verification of all transmission lines completes, then the scheduling scheme finally giving is next tune Spend the Optimized Operation scheme of period.

2. the power system electric energy-standby joint optimal operation side considering zonal reserve and N-1 verification as claimed in claim 1 Method it is characterised in that：Described system reserve minimum essential requirement amount includes system fading margin standby minimum essential requirement amountAnd system rotation Standby minimum essential requirement amountZonal reserve minimum essential requirement amount includes subregion spinning reserve minimum essential requirement amount It is taken as region The a% of electrical network total load；It is taken as the b% of regional power grid total load and regional power grid maximum generation unit installed capacity Smaller value；It is taken as the c% of corresponding subregion z load.

3. the power system electric energy-standby joint optimal operation side considering zonal reserve and N-1 verification as claimed in claim 2 Method it is characterised in that：The span of described a, b, c is respectively a=2～5, b=8～10, c=8～10.

4. the power system electric energy-standby joint optimal operation side considering zonal reserve and N-1 verification as claimed in claim 1 Method it is characterised in that：The minimum essential requirement amount of described system reserve and zonal reserve is obtained by off-line simulation.

5. the power system electric energy-standby joint optimal operation side considering zonal reserve and N-1 verification as claimed in claim 1 Method it is characterised in that：Described object function is expressed as：

$min(\underset{i}{\overset{N_g}{\Σ}}{\mathrm{\α}}_i{P}_i+\underset{i}{\overset{N_a}{\Σ}}{\mathrm{\β}}_i\left(A_i^{+}+A_i^{-}\right)+\underset{i}{\overset{N_g}{\Σ}}{\mathrm{\γ}}_i{R}_i)$

Wherein, P_iPlan for i-th generating set is exerted oneself,It is adjusted up the purchase volume of spare capacity for i-th AGC unit,Adjust downwards the purchase volume of spare capacity, R for i-th AGC unit_iPurchase for i-th generating set spinning reserve capacity Amount, α_i、β_iAnd γ_iRepresent i-th generating set electric energy respectively, adjust standby and spinning reserve quotation, N_gCan for regional power grid The sum of scheduling generating set, N_aSum for regional power grid AGC unit.

6. the power system electric energy-standby joint optimal operation side considering zonal reserve and N-1 verification as claimed in claim 1 Method it is characterised in that：Described electric energy-standby combined optimization the model considering zonal reserve demand includes following constraints：

1) power balance equation

$\underset{i=1}{\overset{N_g}{\Σ}}{P}_i=\underset{i=1}{\overset{N_d}{\Σ}}{D}_i$

Wherein, P_iPlan for i-th generating set is exerted oneself, D_iRepresent the load of i-th node, N_gFor regional power grid schedulable The sum of generating set, N_dNodes for regional power grid；

2) generated output power constraint

For all AGC units：

AndMeanwhile,And

Wherein,It is adjusted up the purchase volume of spare capacity for i-th AGC unit,Adjust downwards standby for i-th AGC unit With the purchase volume of capacity, R_iFor the purchase volume of i-th generating set spinning reserve capacity, P_imaxMaximum for i-th generating set Active exert oneself, P_iminMinimum technology for i-th generating set is exerted oneself, A_imaxAGC for i-th generating set adjusts the upper limit, A_iminAGC for i-th generating set adjusts lower limit；

For all schedulable non-AGC units：

P_i+R_i≤P_imax

3) generator climbing rate constraint

$-T\·r_i^{-}\≤P_i-P_{0i}\≤T\·r_i^{+}$

Wherein, P_0iFor on i-th generating set of regional power grid a scheduling slot active go out force value, r_i ⁺For regional power grid i-th The ratio of slope of climbing of generating set, r_i ^-For the downward climbing rate of i-th generating set of regional power grid, T is scheduling slot length；

4) standby climbing rate constraint

And

Wherein, t₁For adjusting standby response time, t₂Response time for spinning reserve；

5) system reserve minimum essential requirement amount constraint

And

Wherein,For system fading margin standby minimum essential requirement amount,For system spinning reserve minimum essential requirement amount, N_aFor regional power grid The sum of AGC unit；

6) zonal reserve minimum essential requirement amount constraint

For each subregion z, have：

$\underset{i=1}{\overset{N_g^z}{\Σ}}{R}_i\≥D_R^z$

Wherein,Represent the number of units of schedulable generating set in subregion z,For subregion spinning reserve minimum essential requirement amount；

7) line transmission capacity-constrained

For circuits all in regional power grid：

$-P_{l_{k}max}\≤P_{l_k}\≤P_{l_{k}max},P_{l_k}=\underset{i=1}{\overset{N_g}{\Σ}}{H}_{ki}{P}_i-\underset{i=1}{\overset{N_d}{\Σ}}{H}_{ki}{D}_i$

Wherein,For the active power on kth bar circuit,For the maximum transfer capacity of kth bar circuit, H_kiFor power transfer Row k i-th column element of distribution factor matrix H.

7. the power system electric energy-standby joint optimal operation side considering zonal reserve and N-1 verification as claimed in claim 1 Method it is characterised in that：Constraints in described step 3 includes：

1) circuit N-1 security constraint

$-P_{l_{k}max}\≤P_{l_k}^m\≤P_{l_{k}max},P_{l_k}^m=\underset{i=1}{\overset{N_g}{\Σ}}{H}_{ki}^m{P}_i-\underset{i=1}{\overset{N_d}{\Σ}}{H}_{ki}^m{D}_i$

Wherein,Active power on kth bar circuit after occurring for m-th anticipation circuit N-1 fault,For kth bar circuit Maximum transfer capacity,It is calculated power transfer distribution under conditions of m-th anticipation circuit N-1 fault occurs Factor matrix H^mRow k i-th column element, P_iPlan for i-th generating set is exerted oneself, D_iRepresent the load of i-th node, N_d For the nodes of regional power grid, N_gSum for regional power grid schedulable unit；

2) generator N-1 security constraint

And

Wherein, R_iFor the purchase volume of i-th generating set spinning reserve capacity,It is adjusted up standby appearance for i-th AGC unit The purchase volume of amount,Adjust downwards the purchase volume of spare capacity for i-th AGC unit,For the standby minimum essential requirement of system fading margin Amount,For subregion spinning reserve minimum essential requirement amount, N_aSum for regional power grid AGC unit；

Meet simultaneously：

And

Wherein,Represent n-th and envision the spinning reserve that generator N-1 fault occurs rear i-th generating set should recall, P_n Represent the active power shortage that n-th anticipation generator N-1 fault causes after occurring；

Also meet simultaneously：

$-P_{l_{k}max}\≤P_{l_k}^n\≤P_{l_{k}max},P_{l_k}^n=\underset{i=1,i\≠n}{\overset{N_g}{\Σ}}{H}_{ki}(P_i+R_i^n)-\underset{i=1}{\overset{N_d}{\Σ}}{H}_{ki}{D}_i$

Wherein,Active power on kth bar circuit after occurring for n-th anticipation generator N-1 fault.

8. the power system electric energy-standby joint optimal operation side considering zonal reserve and N-1 verification as claimed in claim 1 Method it is characterised in that：Described N-1 check formula is：

$-P_{l_{k}max}\≤P_{l_k}^u\≤P_{l_{k}max},P_{l_k}^u=\underset{i=1}{\overset{N_g}{\Σ}}{H}_{ki}^u{P}_i-\underset{i=1}{\overset{N_d}{\Σ}}{H}_{ki}^u{D}_i$

Wherein,There is the active power on kth article circuit after N-1 fault for the u article subregion internal transmission line,For kth The maximum transfer capacity of bar circuit,It is calculated under conditions of the u article subregion internal transmission line N-1 fault occurs Power shifts distribution factor matrix H^uRow k i-th column element, P_iPlan for i-th generating set is exerted oneself, D_iRepresent i-th section The load of point, N_dFor the nodes of regional power grid, N_gSum for regional power grid schedulable unit.