CN105958547A - Electric power balance scheduling method considering thermoelectric unit limit values - Google Patents

Abstract

The invention provides an electric power balance scheduling method considering thermoelectric unit limit values. The method comprises the following steps of: (1) calculating network supply power generation power; (2) calculating a power deviation; (3) calculating power generation output limit values of a routine unit and a thermoelectric unit; (4) selecting balancing units, and determining a balancing sequence; (5) selecting units whose balance sequences are in the first p, and calculating an adjustable output value; (6) judging whether the adjustable output value meets the requirements of power balance; and (7), calculating the final planed output of the unit. According to the invention, the problem of fixed limit values of a conventional thermoelectric unit is avoided in a power unbalance value distribution process, and the peak load regulation capability of the system is improved.

Description

A kind of power balance dispatching method considering thermoelectricity unit limit value

Technical field

The present invention relates to a kind of power balance dispatching method, be specifically related to a kind of power balance considering thermoelectricity unit limit value Dispatching method.

Background technology

At present, each net, electric power saving dispatching control center substantially have employed the day with security-constrained dispatch as core technology Front generation schedule preparation method, in security-constrained dispatch includes security constraint Unit Combination and security constrained economic dispatch two aspect Holding, its regulation goal 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 The requirement of policy, it is ensured that the hair electric equilibrium of system, thus realize power grid security, stable, high-quality operation.

But, after planning completes or plans to issue, the possibility that planning data needs adjust temporarily can be there is, than As manually adjusted the power curve of indivedual unit, exchange plan, load prediction temporal shift etc. between saving is netted in higher level request adjustment, when When these situations occur, the generation schedule a few days ago originally worked out by security-constrained dispatch will no longer satisfy wanting of power-balance Ask.If recalculated, on the one hand, all units will undertake power deviation, the plan of unit will re-issue again；Another Aspect, however it remains the power curve of indivedual units and go out the possibility that force level needs to adjust again.

Meanwhile, there are some large sized unit directly adjusted in each net, provincial electric power company, and peak modulation capacity is strong, in actual production In operation, planning personnel be often desirable to go to undertake with these units adjust temporarily the power deviation amount brought rather than Undertaken by whole units.And the confession warm season of northern area, owing to being affected by tradition " electricity determining by heat ", thermal power plant unit generates electricity Limit value of exerting oneself is fixed, and peak modulation capacity is limited.

Summary of the invention

In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of power balance considering thermoelectricity unit limit value to adjust Degree method, the present invention is when distributing unbalanced power amount, it is to avoid Conventional thermoelectric unit fixes the problem of limit value, improves system Peak modulation capacity.

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

A kind of power balance dispatching method considering thermoelectricity unit limit value, comprises the steps:

(1) net is calculated for generated output；

(2) power deviation is calculated；

(3) conventional power unit and the generated output limit value of thermoelectricity unit are calculated；

(4) choose balance unit, determine balance order；

(5) choose the unit that balance order is front p, be calculated and may bring up force value；

(6) may bring up whether force value meets the demand of power-balance described in judgement；

(7) last minute planning calculating unit is exerted oneself.

Preferably, in described step (1), calculate described net for generating merit according to system loading prediction and interconnection plan Rate, formula is as follows:

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

In formula, P_w,t、P_f,t、P_c,tRepresent that t period net is for generated output, system loading prediction and interconnection plan merit respectively Rate.

Preferably, in described step (2), according to the power deviation Δ P of the plan output calculation t period of unit day part_t, Formula is as follows:

${\mathrm{\ΔP}}_t=P_{w,t}-\underset{k=1}{\overset{s}{\Σ}}{P}_{k,t}---\left(2\right)$

In formula, P_k,tRepresenting that the unit k plan in the t period is exerted oneself, s is unit quantity.

Preferably, in described step (3), the computing formula of the generated output limit value of described conventional power unit is as follows:

$P_{i,t}^{\max }=min\{P_i^{\max },P_{i,t-1}+{\mathrm{\γ}}_i\}---\left(3\right)$

$P_{i,t}^{\min }=\max \{P_i^{\min },P_{i,t-1}-{\mathrm{\χ}}_i\}---\left(4\right)$

In formula,Represent that t period conventional power unit is exerted oneself higher limit and lower limit respectively, P_i ^max、P_i ^minOften represent The nominal output upper and lower bound value of rule unit i, P_i,t-1Represent that the conventional power unit i plan in the t-1 period is exerted oneself, γ_i、χ_iRespectively Represent climbing rate and the landslide rate of conventional power unit i；

The generated output limit value of described thermoelectricity unit is the coupled thermomechanics characteristic curve according to thermoelectricity unit, by anticipated Thermal load demands determines the electric power upper lower limit value of thermoelectricity unit, and computing formula is as follows:

$P_{j,t}^{\max }=a_{1j}{H}_j+b_{1j}---\left(5\right)$

$P_{j,t}^{\min }=a_{2j}{H}_j+b_{2j}---\left(6\right)$

In formula,Represent the generated output upper limit and generated output lower limit, a of thermoelectricity unit respectively_1j、b_1jRepresent The slope of thermoelectricity unit output upper limit curve and vertical intercept, a_2j、b_2jRepresent that the slope of thermoelectricity unit output lower limit curve cuts with vertical Away from, H_jRepresent anticipated thermic load.

Preferably, in described step (4), from described conventional power unit and described thermoelectricity unit, any selected part unit is made For described balance unit, and determine the balance order of described balance unit: 1,2 ..., p ....

Preferably, in described step (5), the formula that may bring up force value described in calculating is as follows:

$P_{up,t}=\underset{i=1}{\overset{m}{\Σ}}(P_{i,t}^{max}-P_{i,t})+\underset{j=1}{\overset{n}{\Σ}}(P_{j,t}^{max}-P_{j,t})---\left(7\right)$

$P_{dw,t}=\underset{i=1}{\overset{m}{\Σ}}(P_{i,t}-P_{i,t}^{\min })+\underset{j=1}{\overset{n}{\Σ}}(P_{j,t}-P_{j,t}^{\min })---\left(8\right)$

In formula, P_up,t、P_dw,tP the balance unit gross capability upper limit and gross capability lower limit before representing respectively, m, n represent respectively Conventional power unit and the quantity of thermoelectricity unit, P in front p balance unit_i,tFor unit i at the force value that is planned out of t period, P_j,tFor machine Group j is in the generated output value of t period.

Preferably, in described step (6), it is judged that described in may bring up whether force value meets the demand of power-balance, if meet Equation below:

$\left\{\begin{array}{c}{P}_{up,t}>{\mathrm{\&Delta;P}}_t,{\mathrm{\&Delta;P}}_t\&GreaterEqual;0\\ P_{dw,t}>-{\mathrm{\&Delta;P}}_t,{\mathrm{\&Delta;P}}_t<0\end{array}\right.---\left(9\right)$

In formula, Δ P_tPower deviation for the unit t period；

Then carrying out step (7), otherwise balance order adds 1, i.e. p=p+1 forwards step (5) to.

Preferably, in described step (7), the formula that described last minute planning is exerted oneself is as follows:

$\left\{\begin{array}{c}{P}_{k,t}^{\&prime;}=P_{k,t}+{\mathrm{\&Delta;P}}_t\&times;\frac{P_{k,t}^{\max }-P_{k,t}}{P_{up,t}},{\mathrm{\&Delta;P}}_t\&GreaterEqual;0\\ P_{k,t}^{\&prime;}=P_{k,t}+{\mathrm{\&Delta;P}}_t\&times;\frac{P_{k,t}-P_{k,t}^{\min }}{P_{dw,t}},{\mathrm{\&Delta;P}}_t<0\end{array}\right.---\left(10\right)$

In formula, P '_k,tActivity of force, P is gone out for last minute planning_k,tExert oneself in the plan of t period for unit k,Exist for unit k The plan of t period is exerted oneself maximum,Exert oneself minima for the unit k plan in the t period.

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

The present invention is when distributing unbalanced power amount, it is to avoid Conventional thermoelectric unit fixes the problem of limit value, passes through thermoelectricity The coupled thermomechanics characteristic of unit determines the generated output limit value of thermoelectricity unit, improves the peak modulation capacity of system.It addition, balance Unit and arranging of balance order can be conducive to planning personnel to electricity, warp while classification eliminates power deviation Energy-conservation grade of helping requirement is carried out control.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of a kind of power balance dispatching method considering thermoelectricity unit limit value of the present invention,

Fig. 2 is Electrothermal Properties curve chart.

Detailed description of the invention

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

As it is shown in figure 1, a kind of power balance dispatching method considering thermoelectricity unit limit value provided for the present invention, specifically walk Rapid as follows:

Step 1, calculating net are for generated output.Obtain system loading prediction and interconnection plan, calculate net for generated output P_w,t, i.e. unit generation power in this dispatching of power netwoks region, computing formula is as follows:

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

In formula, P_w,t、P_f,t、P_c,tRepresent that t period net is for generated output, system loading prediction and interconnection plan merit respectively Rate.

Step 2, calculating power deviation.The plan of the day part obtaining unit is exerted oneself, and calculates the power deviation Δ of t period P_t, it is shown below:

${\mathrm{\&Delta;P}}_t=P_{w,t}-\underset{k=1}{\overset{s}{\&Sigma;}}{P}_{k,t}---\left(2\right)$

P in formula_i,tRepresenting that the unit k plan in the t period is exerted oneself, s is unit quantity.

Step 3, the generated output limit value of calculating conventional power unit.Due to firm output unit, the unit that overhauls or stop transport, new energy Unit scalable interval, source is very limited, the most only considers that those have scalable and exert oneself conventional power unit.On conventional power unit is exerted oneself Lower limit determines that method is as follows:

$P_{i,t}^{\max }=min\{P_i^{\max },P_{i,t-1}+{\mathrm{\&gamma;}}_i\}---\left(3\right)$

$P_{i,t}^{\min }=\max \{P_i^{\min },P_{i,t-1}-{\mathrm{\&chi;}}_i\}---\left(4\right)$

In formulaRepresent t period unit output higher limit and lower limit, P respectively_i ^max、P_i ^minRepresent unit i's Nominal output upper and lower bound value, P_i,t-1Represent that the unit i plan in the t-1 period is exerted oneself, γ_i、χ_iRepresent climbing of unit i respectively Ratio of slope and landslide rate.

Step 4, the generated output limit value of calculating thermoelectricity unit.Obtain coupled thermomechanics relation and the thermic load number of thermoelectricity unit According to, according to the coupled thermomechanics characteristic curve of thermoelectricity unit, determined that by anticipated thermal load demands the electric power of thermoelectricity unit is upper and lower Limit.

As in figure 2 it is shown, be typical Electrothermal Properties curve, be may determine that on the generated output of thermoelectricity unit by thermic load LimitWith generated output lower limit

$P_{j,t}^{\max }=a_{1j}{H}_j+b_{1j}---\left(5\right)$

$P_{j,t}^{\min }=a_{2j}{H}_j+b_{2j}---\left(6\right)$

A in formula_1j、b_1jRepresent slope and vertical intercept, a of thermoelectricity unit output upper limit curve_2j、b_2jRepresent that thermoelectricity unit goes out The slope of power lower limit curve and vertical intercept,

Step 5, choose balance unit, determine balance order.Any selected part machine from conventional power unit and thermoelectricity unit Group is as balance unit, and determines the balance order of unit: 1,2 ..., p ....

Step 6, to choose balance order be the unit of front p, calculates adjustable exerting oneself:

$P_{up,t}=\underset{i=1}{\overset{m}{\&Sigma;}}(P_{i,t}^{max}-P_{i,t})+\underset{j=1}{\overset{n}{\&Sigma;}}(P_{j,t}^{max}-P_{j,t})---\left(7\right)$

$P_{dw,t}=\underset{i=1}{\overset{m}{\&Sigma;}}(P_{i,t}-P_{i,t}^{\min })+\underset{j=1}{\overset{n}{\&Sigma;}}(P_{j,t}-P_{j,t}^{\min })---\left(8\right)$

P in formula_up,t、P_dw,tP the balance unit gross capability upper limit and gross capability lower limit before representing respectively.Before m, n represent respectively Conventional power unit and the quantity of thermoelectricity unit in p balance unit.

Step 7, judge whether adjustable exerting oneself meets the demand of power-balance, it may be assumed that

If meeting following formula, then carry out next step and calculate

$\left\{\begin{array}{c}{P}_{up,t}>{\mathrm{\&Delta;P}}_t,{\mathrm{\&Delta;P}}_t\&GreaterEqual;0\\ P_{dw,t}>-{\mathrm{\&Delta;P}}_t,{\mathrm{\&Delta;P}}_t<0\end{array}\right.---\left(9\right)$

Otherwise, balance order adds 1, i.e. p=p+1 returns the 6th step.

Step 8, the last minute planning calculating unit are exerted oneself P '_k,t, computational methods are as follows:

$\left\{\begin{array}{c}{P}_{k,t}^{\&prime;}=P_{k,t}+{\mathrm{\&Delta;P}}_t\&times;\frac{P_{k,t}^{\max }-P_{k,t}}{P_{up,t}},{\mathrm{\&Delta;P}}_t\&GreaterEqual;0\\ P_{k,t}^{\&prime;}=P_{k,t}+{\mathrm{\&Delta;P}}_t\&times;\frac{P_{k,t}-P_{k,t}^{\min }}{P_{dw,t}},{\mathrm{\&Delta;P}}_t<0\end{array}\right.---\left(10\right)$

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 (8)

1. the power balance dispatching method considering thermoelectricity unit limit value, it is characterised in that comprise the steps:

(1) net is calculated for generated output；

(2) power deviation is calculated；

(3) conventional power unit and the generated output limit value of thermoelectricity unit are calculated；

(4) choose balance unit, determine balance order；

(5) choose the unit that balance order is front p, be calculated and may bring up force value；

(6) may bring up whether force value meets the demand of power-balance described in judgement；

(7) last minute planning calculating unit is exerted oneself.

The most according to claim 1, method, it is characterised in that in described step (1), according to system loading prediction and interconnection Plan calculates described net and supplies generated output, and formula is as follows:

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

In formula, P_w,t、P_f,t、P_c,tRepresent that t period net is for generated output, system loading prediction and interconnection unscheduled power respectively.

Method the most according to claim 1, it is characterised in that in described step (2), exert oneself according to the plan of unit day part Calculate the power deviation Δ P of t period_t, formula is as follows:

${\mathrm{\&Delta;P}}_t=P_{w,t}-\underset{k=1}{\overset{s}{\&Sigma;}}{P}_{k,t}---\left(2\right)$

In formula, P_k,tRepresenting that the unit k plan in the t period is exerted oneself, s is unit quantity.

Method the most according to claim 1, it is characterised in that in described step (3), the generated output limit of described conventional power unit The computing formula of value is as follows:

$P_{i,t}^{\max }=min\{P_i^{\max },P_{i,t-1}+{\mathrm{\&gamma;}}_i\}---\left(3\right)$

$P_{i,t}^{\min }=\max \{P_i^{\min },P_{i,t-1}-{\mathrm{\&chi;}}_i\}---\left(4\right)$

In formula,Represent that t period conventional power unit is exerted oneself higher limit and lower limit respectively,Represent routine The nominal output upper and lower bound value of unit i, P_i,t-1Represent that the conventional power unit i plan in the t-1 period is exerted oneself, γ_i、χ_iTable respectively Show climbing rate and the landslide rate of conventional power unit i；

The generated output limit value of described thermoelectricity unit is the coupled thermomechanics characteristic curve according to thermoelectricity unit, is born by anticipated heat Lotus demand determines the electric power upper lower limit value of thermoelectricity unit, and computing formula is as follows:

$P_{j,t}^{\max }=a_{1j}{H}_j+b_{1j}---\left(5\right)$

$P_{j,t}^{\min }=a_{2j}{H}_j+b_{2j}---\left(6\right)$

In formula,Represent the generated output upper limit and generated output lower limit, a of thermoelectricity unit respectively_1j、b_1jRepresent thermoelectricity The slope of unit output upper limit curve and vertical intercept, a_2j、b_2jRepresent slope and vertical intercept, the H of thermoelectricity unit output lower limit curve_j Represent anticipated thermic load.

The most according to claim 1, method, it is characterised in that in described step (4), from described conventional power unit and described thermoelectricity In unit, any selected part unit is as described balance unit, and determines the balance order of described balance unit: 1,2 ..., p,…。

Method the most according to claim 1, it is characterised in that in described step (5), may bring up the formula of force value described in calculating As follows:

$P_{up,t}=\underset{i=1}{\overset{m}{\&Sigma;}}(P_{i,t}^{max}-P_{i,t})+\underset{j=1}{\overset{n}{\&Sigma;}}(P_{j,t}^{max}-P_{j,t})---\left(7\right)$

$P_{dw,t}=\underset{i=1}{\overset{m}{\&Sigma;}}(P_{i,t}-P_{i,t}^{\min })+\underset{j=1}{\overset{n}{\&Sigma;}}(P_{j,t}-P_{j,t}^{\min })---\left(8\right)$

In formula, P_up,t、P_dw,tP the balance unit gross capability upper limit and gross capability lower limit before representing respectively, m, n represent front p respectively Conventional power unit and the quantity of thermoelectricity unit, P in balance unit_i,tFor unit i at the force value that is planned out of t period, P_j,tExist for unit j The generated output value of t period.

Method the most according to claim 1, it is characterised in that in described step (6), it is judged that described in whether may bring up force value full The demand of foot power-balance, if meeting equation below:

$\left\{\begin{array}{c}{P}_{up,t}>{\mathrm{\&Delta;P}}_t,{\mathrm{\&Delta;P}}_t\&GreaterEqual;0\\ P_{dw,t}>-{\mathrm{\&Delta;P}}_t,{\mathrm{\&Delta;P}}_t<0\end{array}\right.---\left(9\right)$

In formula, Δ P_tPower deviation for the unit t period；

Then carrying out step (7), otherwise balance order adds 1, i.e. p=p+1 forwards step (5) to.

Method the most according to claim 1, it is characterised in that in described step (7), the formula that described last minute planning is exerted oneself is such as Under:

$\left\{\begin{array}{c}{P}_{k,t}^{\&prime;}=P_{k,t}+{\mathrm{\&Delta;P}}_t\&times;\frac{P_{k,t}^{\max }-P_{k,t}}{P_{up,t}},{\mathrm{\&Delta;P}}_t\&GreaterEqual;0\\ P_{k,t}^{\&prime;}=P_{k,t}+{\mathrm{\&Delta;P}}_t\&times;\frac{P_{k,t}-P_{k,t}^{\min }}{P_{dw,t}},{\mathrm{\&Delta;P}}_t<0\end{array}\right.---\left(10\right)$

In formula, P '_k,tActivity of force, P is gone out for last minute planning_k,tExert oneself in the plan of t period for unit k,For unit k in the t period Plan exert oneself maximum,Exert oneself minima for the unit k plan in the t period.