CN103839198B - A kind of Constraint for security constrained economic dispatch generates method - Google Patents

Abstract

The present invention provides a kind of Constraint for security constrained economic dispatch to generate method, comprises the following steps: calculate net for generated energy；Set state is set and unit electricity calculates power, and participate in unit and the load factor thereof of Constraint；Calculate the total electricity being not involved in Constraint unit and the basic electricity participating in Constraint unit；Obtain and participate in the total electricity of scalable of Constraint unit and finally retrain electricity；Calculate the actual loading rate of unit；The final constraint electricity obtained is verified.The Constraint for security constrained economic dispatch that the present invention provides generates method, state and the output defeat situation of unit can be taken into full account, by adjusting again basis electricity, it is met the Constraint of scheduling requirement, and participate in security constrained economic dispatch optimization calculating, improve the quality of planning.

Description

A kind of Constraint for security constrained economic dispatch generates method

Technical field

The invention belongs to security constraint manager scheduling field, be specifically related to a kind of electricity for security constrained economic dispatch Constraint generation method.

Background technology

Along with going deep into of power system reform and answering of international finance, the change of energy general layout, and New Technologies of Electric Power Transmission With the expansion with power system scale, the target of generation schedule establishment also becomes increasingly complex with constraint, and tradition with artificial establishment is Main generation schedule form of presentation increasingly cannot adapt to the requirement of production practices, it is therefore desirable to utilizes and can meet various constraint bar The security-constrained dispatch method of part, it is achieved the pattern of generation schedule establishment turns to the mode of constraint oriented from the mode towards curve Becoming, by improving the intelligent level of planning, generation schedule is compiled by adaptation electricity market, energy-saving distribution, " three is public " scheduling The requirement of system.

Security-constrained dispatch is the core technology that electric power system dispatching mechanism is applied in generation schedule manages, bag Security constraint Unit Combination and security constrained economic dispatch two aspect content are included.The generation schedule management of scheduling institution realizes Target is: on the premise of meeting various networks and unit operation parameter, it is considered to all kinds of economy, energy-saving and environmental protection policy want Ask, it is ensured that the hair electric equilibrium of system, thus realize power grid security, stable, high-quality operation.

Security-constrained dispatch is extensive, non-linear, time-varying, a mixed integer optimization problem, and its object function is such as Under:

$\min F=\underset{i=1,t=1}{\overset{I,T}{\mathrm{\Σ}}}{C}_{i,t}\left(p_{i,t}\right)$

Wherein: C_i,t(p_i,t) refer to the operating cost of i-th unit of t period.

Under this object function, system be also satisfied following constraints:

1) day part unit output summation and aggregate demand go out the constraint of dynamic balance；

2) requirement of electric quantity balancing is met；

3) system boot situation meets standby requirement；

4) each unit output is maintained at the constraint between its technology EIAJ and technology minimum load；

5) the liter descending grade speed of each unit meets machine unit characteristic requirement；

6) constraint in the range of each Branch Power Flow of network is maintained at normal limit；

7) other constraints.

Under current scheduling method, electricity progress is more paid close attention to by power plant and control centre.General method is to arrange Unit Constraint controls electricity, but current Constraint is both for single unit (machine group), seldom from entirely Constraint from the point of view of net electric quantity balancing, and calculating Constraint when, seldom can take into full account the state of unit With the situation of being obstructed, cause the Constraint calculated can not meet the requirement of security constrained economic dispatch.

Summary of the invention

In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of electricity for security constrained economic dispatch about Shu Shengcheng method, can take into full account state and the output defeat situation of unit, by adjusting again basis electricity, is met The Constraint of scheduling requirement, and participate in security constrained economic dispatch optimization calculating, improve the quality of planning.

In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that:

The present invention provides a kind of Constraint for security constrained economic dispatch to generate method, and described method includes following Step:

Step 1: calculate net for generated energy；

Step 2: set state is set and unit electricity calculates power, and participate in unit and the load thereof of Constraint Rate；

Step 3: calculate the total electricity being not involved in Constraint unit and the basic electricity participating in Constraint unit；

Step 4: obtain and participate in the total electricity of scalable of Constraint unit and finally retrain electricity；

Step 5: calculate the actual loading rate of unit；

Step 6: the final constraint electricity obtained is verified.

In described step 1, net is for generated energy Q_wRepresent, then have:

P_w,t=P_f,t-P_c,t(1)

$Q_w=\frac{1}{4}\underset{t=m}{\overset{n}{\mathrm{\Σ}}}{P}_{w,t}---\left(2\right)$

Wherein, P_w,t、P_f,tAnd P_c,tRepresent that t period net is for power, Load Prediction In Power Systems value and interconnection plan respectively Power；M and n represents the starting and ending period of Constraint respectively.

In described step 2, set state is set by parameter setting system and unit electricity calculates power, and participate in electricity The unit of amount constraint and the load factor of unit.

Described set state includes shutdown, firm output and normal boot-strap；

1), when unit is in stopped status, it is zero that unit electricity calculates power；

2), when unit is in firm output state, it is firm output value that unit electricity calculates power；

3) when unit is in normal boot-strap state, if not having output defeat, unit electricity calculates power and takes machine set technology Parameter, if be obstructed, unit electricity calculates power and takes machine set technology parameter and the difference being obstructed.

In described step 3, calculate power and the load factor of unit according to unit electricity, calculate and be not involved in Constraint unit Total electricity and participate in Constraint unit basic electricity, be not involved in total electricity Q of Constraint unit_nRepresent, basis Electricity includes fixing electricity Q_f,iWith scalable electricity Q_a,i, specifically have:

$Q_n=\frac{1}{4}\underset{j=1}{\overset{\mathrm{num}1}{\mathrm{\Σ}}}\underset{t=m}{\overset{n}{\mathrm{\Σ}}}P---\left(3\right)$

$Q_{f,i}=\frac{1}{4}\underset{t=m}{\overset{n}{\mathrm{\Σ}}}P---\left(4\right)$

$Q_{a,i}=\frac{1}{4}\underset{t=m}{\overset{n}{\mathrm{\Σ}}}P\·\mathrm{\η}---\left(5\right)$

Wherein, i represents the unit participating in Constraint, and j represents the unit being not involved in Constraint, and P represents unit electricity Calculating power, η represents the load factor of unit, and num1 represents the number being not involved in Constraint unit.

In described step 4, the total electricity of scalable and the final constraint electricity that participate in Constraint unit use Q respectively_adjustWith Q_iRepresent, specifically have:

$Q_{\mathrm{adjust}}=Q_w-Q_n-\underset{i=1}{\overset{\mathrm{num}2}{\mathrm{\Σ}}}{Q}_{f,i}---\left(6\right)$

${\stackrel{\‾}{Q}}_{a,i}=Q_{\mathrm{adjust}}\×\frac{Q_{a,i}}{\underset{i=1}{\overset{\mathrm{num}2}{\mathrm{\Σ}}}{Q}_{a,i}}---\left(7\right)$

$Q_i=Q_{f,i}+{\stackrel{\‾}{Q}}_{a,i}---\left(8\right)$

Wherein, num2 represents the number participating in Constraint unit,Represent the actual adjustable electricity shared of unit i.

In described step 5, actual loading rate η of unit i_cal,iRepresenting, its expression formula is:

${\mathrm{\η}}_{\mathrm{cal},i}=\frac{Q_i}{24\·P_i}---\left(9\right)$

Wherein, P_iIt it is the rated capacity of unit i.

To the final constraint electricity Q obtained_iVerify, if unit i actual loading rate η calculated_cal,iLess than 50%, or Person is more than 100%, then point out, and be back to step 2, reset the load factor of unit.

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

The Constraint for security constrained economic dispatch that the present invention provides generates method and utilizes unit electricity to calculate merit Rate had both considered the running status of unit, had been obstructed and load factor, defined basis Constraint, again from the angle of the whole network electric quantity balancing Spend and basis electricity be adjusted, and final electricity is verified, thus be met the Constraint of scheduling actual requirement, Achieve accurately calculating and controlling electricity, and participate in security constrained economic dispatch optimization calculating, improve the matter of planning Amount.

Accompanying drawing explanation

Fig. 1 is the Constraint generation method flow diagram for security constrained economic dispatch.

Detailed description of the invention

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

Such as Fig. 1, the present invention provides a kind of Constraint for security constrained economic dispatch to generate method, described method bag Include following steps:

Step 1: calculate net for generated energy；

Step 2: set state is set and unit electricity calculates power, and participate in unit and the load thereof of Constraint Rate；

Step 3: calculate the total electricity being not involved in Constraint unit and the basic electricity participating in Constraint unit；

Step 4: obtain and participate in the total electricity of scalable of Constraint unit and finally retrain electricity；

Step 5: calculate the actual loading rate of unit；

Step 6: the final constraint electricity obtained is verified.

In described step 1, net is for generated energy Q_wRepresent, then have:

P_w,t=P_f,t-P_c,t(1)

$Q_w=\frac{1}{4}\underset{t=m}{\overset{n}{\mathrm{\Σ}}}{P}_{w,t}---\left(2\right)$

Wherein, P_w,t、P_f,tAnd P_c,tRepresent that t period net is for power, Load Prediction In Power Systems value and interconnection plan respectively Power；M and n represents the starting and ending period of Constraint respectively.

In described step 2, set state is set by parameter setting system and unit electricity calculates power, and participate in electricity The unit of amount constraint and the load factor of unit.

Described set state includes shutdown, firm output and normal boot-strap；

4), when unit is in stopped status, it is zero that unit electricity calculates power；

5), when unit is in firm output state, it is firm output value that unit electricity calculates power；

6) when unit is in normal boot-strap state, if not having output defeat, unit electricity calculates power and takes machine set technology Parameter, if be obstructed, unit electricity calculates power and takes machine set technology parameter and the difference being obstructed.

In described step 3, calculate power and the load factor of unit according to unit electricity, calculate and be not involved in Constraint unit Total electricity and participate in Constraint unit basic electricity, be not involved in total electricity Q of Constraint unit_nRepresent, basis Electricity includes fixing electricity Q_f,iWith scalable electricity Q_a,i, specifically have:

$Q_n=\frac{1}{4}\underset{j=1}{\overset{\mathrm{num}1}{\mathrm{\Σ}}}\underset{t=m}{\overset{n}{\mathrm{\Σ}}}P---\left(3\right)$

$Q_{f,i}=\frac{1}{4}\underset{t=m}{\overset{n}{\mathrm{\Σ}}}P---\left(4\right)$

$Q_{a,i}=\frac{1}{4}\underset{t=m}{\overset{n}{\mathrm{\Σ}}}P\·\mathrm{\η}---\left(5\right)$

Wherein, i represents the unit participating in Constraint, and j represents the unit being not involved in Constraint, and P represents unit electricity Calculating power, η represents the load factor of unit, and num1 represents the number being not involved in Constraint unit.

In described step 4, the total electricity of scalable and the final constraint electricity that participate in Constraint unit use Q respectively_adjustWith Q_iRepresent, specifically have:

$Q_{\mathrm{adjust}}=Q_w-Q_n-\underset{i=1}{\overset{\mathrm{num}2}{\mathrm{\Σ}}}{Q}_{f,i}---\left(6\right)$

${\stackrel{\‾}{Q}}_{a,i}=Q_{\mathrm{adjust}}\×\frac{Q_{a,i}}{\underset{i=1}{\overset{\mathrm{num}2}{\mathrm{\Σ}}}{Q}_{a,i}}---\left(7\right)$

$Q_i=Q_{f,i}+{\stackrel{\‾}{Q}}_{a,i}---\left(8\right)$

Wherein, num2 represents the number participating in Constraint unit,Represent the actual adjustable electricity shared of unit i.

In described step 5, actual loading rate η of unit i_cal,iRepresenting, its expression formula is:

${\mathrm{\η}}_{\mathrm{cal},i}=\frac{Q_i}{24\·P_i}---\left(9\right)$

Wherein, P_iIt it is the rated capacity of unit i.

To the final constraint electricity Q obtained_iVerify, if unit i actual loading rate η calculated_cal,iLess than 50%, or Person is more than 100%, then point out, and be back to step 2, reset the load factor of unit.

Constraint is joined in the constraints of security constrained economic dispatch, by security constrained economic dispatch algorithm The plan obtaining unit is exerted oneself.

Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, to the greatest extent The present invention has been described in detail by pipe with reference to above-described embodiment, and those of ordinary skill in the field are it is understood that still The detailed description of the invention of the present invention can be modified or equivalent, and any without departing from spirit and scope of the invention Amendment or equivalent, it all should be contained in the middle of scope of the presently claimed invention.

Claims (3)

1. the Constraint for security constrained economic dispatch generates method, it is characterised in that: described method includes following Step:

Step 1: calculate net for generated energy；

Step 2: set state is set and unit electricity calculates power, and participate in unit and the load factor thereof of Constraint；

Step 3: calculate the total electricity being not involved in Constraint unit and the basic electricity participating in Constraint unit；

Step 4: obtain and participate in the total electricity of scalable of Constraint unit and finally retrain electricity；

Step 5: calculate the actual loading rate of unit；

Step 6: the final constraint electricity obtained is verified；

In described step 1, net is for generated energy Q_wRepresent, then have:

P_w,t=P_f,t-P_c,t (1)

$Q_w=\frac{1}{4}\underset{t=m}{\overset{n}{\Σ}}{P}_{w,t}---\left(2\right)$

Wherein, P_w,t、P_f,tAnd P_c,tRepresent that t period net is for power, Load Prediction In Power Systems value and interconnection plan merit respectively Rate；M and n represents the starting and ending period of Constraint respectively；

In described step 2, set state is set by parameter setting system and unit electricity calculates power, and participate in electricity about The unit of bundle and the load factor of unit；

Described set state includes shutdown, firm output and normal boot-strap；

1), when unit is in stopped status, it is zero that unit electricity calculates power；

2), when unit is in firm output state, it is firm output value that unit electricity calculates power；

3) when unit is in normal boot-strap state, if not having output defeat, unit electricity calculates power and takes machine set technology parameter, If be obstructed, unit electricity calculates power and takes machine set technology parameter and the difference being obstructed；

In described step 3, calculate power and the load factor of unit according to unit electricity, calculate and be not involved in the total of Constraint unit Electricity and the basic electricity of participation Constraint unit, be not involved in total electricity Q of Constraint unit_nRepresent, basis electricity Including fixing electricity Q_f,iWith scalable electricity Q_a,i, specifically have:

$Q_n=\frac{1}{4}\underset{j=1}{\overset{num1}{\Σ}}\underset{t=m}{\overset{n}{\Σ}}P---\left(3\right)$

$Q_{f,i}=\frac{1}{4}\underset{t=m}{\overset{n}{\Σ}}P---\left(4\right)$

$Q_{a,i}=\frac{1}{4}\underset{t=m}{\overset{n}{\Σ}}P\·\mathrm{\η}---\left(5\right)$

Wherein, i represents the unit participating in Constraint, and j represents the unit being not involved in Constraint, and P represents that unit electricity calculates Power, η represents the load factor of unit, and num1 represents the number being not involved in Constraint unit；

In described step 4, the total electricity of scalable and the final constraint electricity that participate in Constraint unit use Q respectively_adjustAnd Q_iTable Show specifically have:

$Q_{adjust}=Q_w-Q_n-\underset{i=1}{\overset{num2}{\Σ}}{Q}_{f,i}---\left(6\right)$

${\stackrel{\‾}{Q}}_{a,i}=Q_{adjust}\×\frac{Q_{a,i}}{\underset{i=1}{\overset{num2}{\Σ}}{Q}_{a,i}}---\left(7\right)$

$Q_i=Q_{f,i}+{\stackrel{\‾}{Q}}_{a,i}---\left(8\right)$

Wherein, num2 represents the number participating in Constraint unit,Represent the actual adjustable electricity shared of unit i.

Constraint for security constrained economic dispatch the most according to claim 1 generates method, it is characterised in that: institute State in step 5, actual loading rate η of unit i_cal,iRepresenting, its expression formula is:

${\mathrm{\η}}_{cal,i}=\frac{Q_i}{24\·P_i}---\left(9\right)$

Wherein, P_iIt it is the rated capacity of unit i.

Constraint for security constrained economic dispatch the most according to claim 2 generates method, it is characterised in that: right The final constraint electricity Q obtained_iVerify, if unit i actual loading rate η calculated_cal,iLess than 50%, or it is more than 100%, then point out, and be back to step 2, reset the load factor of unit.