CN103280797A - Day-ahead static security correction method - Google Patents

Abstract

The invention relates to the technical field of dispatching automation of an electric power system, in particular relates to a day-ahead static security correction method. The security correction method comprises the following steps of step 1, pre-checking and correcting a power planned value of an interregional junctor section; step 2, carrying out AC (alternating current) power flow calculation, and calculating balancing nodes and unbalanced active power in each region; step 3, judging whether the absolute value of the unbalanced active power is less than a convergence criteria; if the absolute value of the unbalanced active power is greater than the convergence criteria, adjusting an adjustable unit and the loaded active power, and returning to the step 2; and otherwise converging power flow, utilizing the power flow calculation result to calculate N-1 and fault set. According to the invention, the active power transmitted by the junctor section is controlled by the planned value, and mismatch quantity between a generation schedule of a system generator set and bus load prediction data is eliminated through partitioned iteration, and a reasonable day-ahead AC (alternating current) power flow section is provided to improve reliability and practicability of day-ahead security correction of the electric power system.

Description

A kind of check method of static security a few days ago

Technical field

The present invention relates to the dispatching automation of electric power systems technical field, be specifically related to a kind of check method of static security a few days ago.

Background technology

The static security Verification Technology is that dispatching of power netwoks department determines the following operational mode of electrical network, instructs the main foundation of electrical production fail safe a few days ago, will be directly connected to electrical network safe operation in the future; Along with the quick construction of the big electrical network of ultra high voltage and integrated operation, unification is in China planned a few days ago and safety check calculating is main development trend.But in the static security a few days ago of the big electrical network of multizone is checked, the qualities of data such as the generation schedule of each area reporting, load prediction and maintenance scheduling have nothing in common with each other, if imbalance power can not get rational distribution in each department, can cause big electrical network to plan the trend result a few days ago and a lot of irrational power distributions occur.In order to address this problem, need to consider each interregional exchange power, by regional interconnection power control, make each zone digest inner imbalance power in proportion voluntarily, thereby guarantee accuracy and practicality that big electrical network is checked safely a few days ago.

Summary of the invention

At the deficiencies in the prior art, the purpose of this invention is to provide a kind of check method of static security a few days ago, the present invention is by the AC power flow calculative strategy of control interconnection through-put power, make each zone digest inner imbalance power in proportion voluntarily, thereby guarantee accuracy and practicality that big electrical network is checked safely a few days ago.

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

A kind of check method of static security a few days ago, its improvements are that described method comprises the steps: based on the control of interconnection section power

Step 1: interregional interconnection section power planning value is carried out pre-verification and correction;

Step 2: carry out AC power flow and calculate, calculated equilibrium node and each regional uneven active power;

Step 3: judge that uneven active power absolute value is whether less than convergence: if uneven active power absolute value greater than convergence, is then adjusted the active power that can regulate unit and load, return step 2; Otherwise the trend convergence utilizes calculation of tidal current to carry out N-1 and the fault collection calculates.

Wherein, in the described step 1, the pre-verification of interregional interconnection section power planning value is comprised:

Determine plan initial value summation Δ p, represent with following formula:

$\mathrm{\Δp}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{p}_i^{\mathrm{sch}0}---\left(1\right);$

If Δ p equals 0, then each interconnection section power planning initial value is by pre-verification:

$p_i^{\mathrm{sch}}=p_i^{\mathrm{sch}0}---\left(2\right);$

In the formula:

Calculate the interconnection section power planning value that adopts i zone for trend;

It is the interconnection section power planning initial value in i zone; N represents that big electrical network is divided into N zone;

If Δ p is not equal to 0, then revise i regional interconnection section power planning initial value

The correction content comprises:

$p_i^{\mathrm{sch}}=p_i^{\mathrm{sch}0}-\mathrm{\Δp}*\left|p_i^{\mathrm{sch}0}\right|/\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\left|p_i^{\mathrm{sch}0}\right|---\left(3\right);$

$\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{p}_i^{\mathrm{sch}}=0.$

Wherein, in the described step 2, adopt the prediction of FutureGen initiative and bus load to carry out basic trend and calculate, total uneven active power concentrates on the balance node, and establishing the balance node region is a, and the big total uneven active power of electrical network is Δ p _s

Except regional a, other each regional uneven active power are:

${\mathrm{\Δp}}_i=p_i^{\mathrm{sch}}-\underset{\mathrm{jk}\∈L_i}{\mathrm{\Σ}}{P}_{\mathrm{jk}---\left(4\right);}$

In the formula: P _JkBe the active power of branch road jk, L _iBe the member's set of fingers in the interconnection section of regional i;

The uneven active power of zone a is:

${\mathrm{\Δp}}_a={\mathrm{\Δp}}_s-\underset{i\∈G,i\≠a_i}{\mathrm{\Σ}}{\mathrm{\Δp}}_i---\left(5\right);$

In the formula: G is regional ensemble.

Wherein, in the described step 3, judge that according to following formula uneven active power absolute value is whether less than convergence:

|Δp _i|＜ε(i∈G) （6）；

In the formula: ε is convergence;

If when satisfying formula (6), judge the trend convergence, utilize calculation of tidal current to carry out N-1 and the calculating of fault collection;

If when not satisfying formula (6), adjustment can be regulated the adjustment amount of the active power of unit and load, is:

${\mathrm{\Δp}}_m^{\mathrm{unld}}=\frac{p_m^{\mathrm{unld}}}{\underset{j\∈R_i}{\mathrm{\Σ}}{p}_j^{\mathrm{unld}}}\·{\mathrm{\Δp}}_i(m\∈R_i,i\∈G)---\left(7\right);$

In the formula:

For regulating the adjustment power that unit or load m bear in proportion;

For regulating the coefficient that unit or load j participate in adjustment; R _iFor participating in the unit of adjustment or the set of load in the regional i.

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

1, the present invention is worth the active power of control contact section transmission according to schedule, amount of mismatch between subregion iteration elimination system generating set generation schedule and the bus load prediction data, provide reasonably AC power flow section a few days ago, carry out N-1 and fault collection on this section basis and calculate, improved reliability and the practicality of electric power system static security check a few days ago.

2, can adapt to the inconsistent situation of the quality of data that zones of different reports, rationally eliminate meritorious amount of unbalance.

3, can check the quality of data situation of each area reporting fast according to the size of each regional power amount of unbalance.

4, can realize the compatibility of interconnection plan and generation schedule, improve the accuracy of static security check result a few days ago.

Description of drawings

Fig. 1 is safe check method flow chart a few days ago in the specific embodiment provided by the invention.

Embodiment

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

The present invention proposes a kind of based on regional interconnection section power control, realizes that static security is checked Calculation Method a few days ago.Flow chart comprises the steps: as shown in Figure 1

Step 1: interregional interconnection section power planning value is carried out pre-verification and correction:

In the step 1 according to claim 1, establish big electrical network and be divided into N zone, all interconnection active power sums in each zone and other zones are its regional interconnection section, and the interconnection section power that is located at i zone is p _i, interconnection section power planning initial value is

Then the interconnection section power sum of All Ranges is zero as can be known:

Pre-verification to interregional interconnection section power planning value comprises:

Calculate plan initial value summation Δ p:

$\mathrm{\Δp}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{p}_i^{\mathrm{sch}0}---\left(1\right);$

If Δ p equals 0, then each interconnection section power planning initial value is by pre-verification:

$p_i^{\mathrm{sch}}=p_i^{\mathrm{sch}0}---\left(2\right);$

In the formula:

Calculate the interconnection section power planning value that adopts for trend.

If Δ p is not equal to 0, then the power planning of regional interconnection section initially needs to revise, and revises content and comprises:

$p_i^{\mathrm{sch}}=p_i^{\mathrm{sch}0}-\mathrm{\Δp}*\left|p_i^{\mathrm{sch}0}\right|/\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\left|p_i^{\mathrm{sch}0}\right|---\left(3\right);$

As can be known, $\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{p}_i^{\mathrm{sch}}=0.$

Step 2: carry out AC power flow and calculate, the uneven active power of calculated equilibrium node then, calculate each regional uneven active power:

At first use the prediction of following generation schedule and bus load to carry out basic trend and calculate, total imbalance power concentrates on the balance node, and establishing the balance node region is a, and the big total imbalance power of electrical network is Δ p _s

Except regional a, other each regional uneven active power are:

${\mathrm{\Δp}}_i=p_i^{\mathrm{sch}}-\underset{\mathrm{jk}\∈L_i}{\mathrm{\Σ}}{P}_{\mathrm{jk}---\left(4\right);}$

In the formula: P _JkBe the active power of branch road jk, L _iBe the member's set of fingers in the interconnection section of regional i.

The imbalance power of zone a is:

${\mathrm{\Δp}}_a={\mathrm{\Δp}}_s-\underset{i\∈G,i\≠a_i}{\mathrm{\Σ}}{\mathrm{\Δp}}_i---\left(5\right);$

In the formula: G is regional ensemble.

Step 3: judge that uneven active power absolute value is whether less than convergence: if uneven active power absolute value is less than convergence, then adjust the active power that to regulate unit and load, return step 2, otherwise the trend convergence utilizes the trend result to carry out N-1 and the calculating of fault collection:

When meeting the following conditions, then trend restrains and utilizes the trend result to carry out N-1 and the calculating of fault collection:

|Δp _i|＜ε(i∈G) （6）；

In the formula: ε is convergence.

When not satisfying convergence, the adjustment amount that adjustment can be regulated the active power of unit and load is:

${\mathrm{\Δp}}_m^{\mathrm{unld}}=\frac{p_m^{\mathrm{unld}}}{\underset{j\∈R_i}{\mathrm{\Σ}}{p}_j^{\mathrm{unld}}}\·{\mathrm{\Δp}}_i(m\∈R_i,i\∈G)---\left(7\right);$

In the formula:

For regulating the adjustment power that unit or load m bear in proportion; For regulating the coefficient that unit or load j participate in adjustment; R _iFor participating in the unit of adjustment or the set of load in the regional i.

The check method of static security a few days ago provided by the invention, the active power of section transmission is got in touch with in value control according to schedule, amount of mismatch between subregion iteration elimination system generating set generation schedule and the bus load prediction data, provide reasonably AC power flow section a few days ago, carry out N-1 and fault collection on this section basis and calculate, improved reliability and the practicality of electric power system static security check a few days ago.

Should be noted that at last: 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 the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (4)

1. a static security check method a few days ago is characterized in that, described method comprises the steps: based on the control of interconnection section power

Step 1: interregional interconnection section power planning value is carried out pre-verification and correction;

Step 2: carry out AC power flow and calculate, calculated equilibrium node and each regional uneven active power;

Step 3: judge that uneven active power absolute value is whether less than convergence: if uneven active power absolute value greater than convergence, is then adjusted the active power that can regulate unit and load, return step 2; Otherwise the trend convergence utilizes calculation of tidal current to carry out N-1 and the fault collection calculates.

2. the check method of static security a few days ago as claimed in claim 1 is characterized in that, in the described step 1, the pre-verification of interregional interconnection section power planning value is comprised:

Determine plan initial value summation Δ p, represent with following formula:

$\mathrm{\Δp}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{p}_i^{\mathrm{sch}0}---\left(1\right);$

If Δ p equals 0, then each interconnection section power planning initial value is by pre-verification:

$p_i^{\mathrm{sch}}=p_i^{\mathrm{sch}0}---\left(2\right);$

In the formula: Calculate the interconnection section power planning value that adopts i zone for trend;

It is the interconnection section power planning initial value in i zone; N represents that big electrical network is divided into N zone;

If Δ p is not equal to 0, then revise i regional interconnection section power planning initial value The correction content comprises:

$p_i^{\mathrm{sch}}=p_i^{\mathrm{sch}0}-\mathrm{\Δp}*\left|p_i^{\mathrm{sch}0}\right|/\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\left|p_i^{\mathrm{sch}0}\right|---\left(3\right);$

$\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{p}_i^{\mathrm{sch}}=0.$

3. the check method of static security a few days ago as claimed in claim 1, it is characterized in that, in the described step 2, adopting the prediction of FutureGen initiative and bus load to carry out basic trend calculates, total uneven active power concentrates on the balance node, if the balance node region is a, the big total uneven active power of electrical network is Δ p _s

Except regional a, other each regional uneven active power are:

${\mathrm{\Δp}}_i=p_i^{\mathrm{sch}}-\underset{\mathrm{jk}\∈L_i}{\mathrm{\Σ}}{P}_{\mathrm{jk}---\left(4\right);}$

In the formula: P _JkBe the active power of branch road jk, L _iBe the member's set of fingers in the interconnection section of regional i;

The uneven active power of zone a is:

${\mathrm{\Δp}}_a={\mathrm{\Δp}}_s-\underset{i\∈G,i\≠a_i}{\mathrm{\Σ}}{\mathrm{\Δp}}_i---\left(5\right);$

In the formula: G is regional ensemble.

4. the check method of static security a few days ago as claimed in claim 1 is characterized in that, in the described step 3, judges that according to following formula uneven active power absolute value is whether less than convergence:

|Δp _i|＜ε(i∈G) （6）；

In the formula: ε is convergence;

If when satisfying formula (6), judge the trend convergence, utilize calculation of tidal current to carry out N-1 and the calculating of fault collection;

If when not satisfying formula (6), adjustment can be regulated the adjustment amount of the active power of unit and load, is:

${\mathrm{\Δp}}_m^{\mathrm{unld}}=\frac{p_m^{\mathrm{unld}}}{\underset{j\∈R_i}{\mathrm{\Σ}}{p}_j^{\mathrm{unld}}}\·{\mathrm{\Δp}}_i(m\∈R_i,i\∈G)---\left(7\right);$

In the formula:

For regulating the adjustment power that unit or load m bear in proportion;

For regulating the coefficient that unit or load j participate in adjustment; R _iFor participating in the unit of adjustment or the set of load in the regional i.