CN104578176B - Method for making power generation plan in consideration of direct current interaction - Google Patents

Abstract

The invention discloses a method for making a power generation plan in consideration of direct current interaction. The method is characterized by comprising the following steps: 01) establishing a receiving-end power grid direct current receptivity analysis model taking received direct current power maximization and minimization as an optimization aim according to the system load requirement constraint, unit running constraint, standby requirement constraint and receiving-end power grid safety constraint of a direct current receiving-end power grid; 02) calculating maximum and minimum safe direct current receiving limits of the direct current receiving-end power grid according to the receiving-end power grid direct current receptivity analysis model; 03) optimally making a direct current sending plan, a new energy output plan, a conventional energy unit starting and stopping plan and an output plan of a sending-end power grid by taking new energy consumption maximization as an optimal aim by virtue of a mixed integer programming method according to the direct current receptivity constraint and direct current plan regulation constraint of the direct current receiving-end power grid and the system load requirement, standby requirement constraint, conventional unit running constraint, new energy power prediction result and sending-end power grid safety constraint of the sending-end power grid.

Description

A kind of meter and the generation schedule preparation method of direct current interaction

Technical field

The present invention relates to the generation schedule preparation method of a kind of meter and direct current interaction.

Background technology

China in Recent Years greatly develops wind-powered electricity generation and photovoltaic generation, plans, by 2015, national wind-powered electricity generation was simultaneously according to Chinese Government Network capacity amount is up to 100GW, and photovoltaic power generation grid-connecting capacity reaches 35GW.But the energy resources geographical distribution of China is very uneven Even, the conventional energy resource such as the Northwest's coal and wind-powered electricity generation, photovoltaic generation aboundresources, but economy is relatively undeveloped, and local electrical network is born Lotus level is relatively low, and electric power is had more than needed more.And wind-powered electricity generation, photovoltaic generation quickly grow in recent years for the Northwest, abandon wind, to abandon optical issue tight Weight, and eastern region is economically developed, energy supply relative deficiency.

For the contradiction promoting the Northwest's economic development and alleviate eastern region energy scarcity, China is using super/extra-high Straightening Flow Line sends mode outside with scene fire bundling, and that the coal of the Northwest, wind and light equal energy source are converted into electric energy is trans-regional remote Distance is transported to east load center, promotes the Northwest's economic development, effectively alleviates east energy shortage and air is dirty The situation of dye.The Northwest has built up the transregional Transmission Corridor of direct current, and direct current sends the nearly 159GW of power, the spy building outside The nearly 160GW of HVDC planned capacity.The construction of these transregional direct current Transmission Corridors is by strong promotion the Northwest new forms of energy Develop and dissolve, realize most optimum distribution of resources in larger scope.

But transregional networking and the fast development of new-energy grid-connected scale, bring new choosing to operation of power networks planning War.Power system both at home and abroad at present mostly adopts security constraint Unit Combination (SCUC) and safety about in terms of operation plan optimization Bundle economic load dispatching (SCED) method.For overcoming the undulatory property of new forms of energy and the intermittent impact to electrical network, optimize new forms of energy scheduling Run, some scholars pass through to increase the uncertainty that spinning reserve considers the new forms of energy such as wind-powered electricity generation, establish deterministic models to grind Study carefully this problem.Domestic scholars propose increase and abandon wind, abandon light loss cost and dissolved maximization target with realizing new forms of energy.But middle promulgated by the State Council Based on fired power generating unit, peak modulation capacity and governing speed are restricted electricity, and the access system peak regulation pressure of extensive new forms of energy swashs Increase, and need guarantee to exert oneself in a large amount of cogeneration units of northern area winter low-valley interval, electrical network marginal capacity is subject to tight About, standby deficiency is the one of the main reasons abandoning wind for recasting.Simultaneously excessive reservation reserve capacity of power grid will also result in conventional machine Organize uneconomical operation.

In addition, because transregional direct current transportation give/receiving end electric network coordination is difficult and high voltage direct current converter equipment is unsuitable frequently Adjust, in therefore domestic operation plan a few days ago, transregional direct current is sent plan and is typically based on transregional electricity transaction result formulation, i.e. base In direct current measurement trade contract performance, according to operating experience, transregional dc power plan is manually set.Transregional direct current is sent outside Pattern most peak interval of time invariable power is sent outside, because not considering intermittence and the undulatory property of new forms of energy, transregional dc power plan Fail to take into full account give/receiving end peak load regulation network and stand-by requirement and new forms of energy short term power predict the outcome, transregional direct current sending end Electrical network a few days ago, in a few days plan when have to retain the more standby stable operation to meet dc power, particularly low The peak load regulation network capacity tensity period of paddy, generation that electrical network new forms of energy may be dissolved has a strong impact on, to power network safety operation Bring the equal Shortcomings of potential risk, safety and economy.

Content of the invention

For the problems referred to above, the present invention provides a kind of meter and the generation schedule preparation method of direct current interaction, is ensureing to send/be subject to Under the premise of the electric power netting safe running of end, flexible arrangement direct current plan undertakes part peak regulation task, promotes new forms of energy to dissolve, reduce electrical network Conventional stand-by requirement, realize direct current send outside plan, new forms of energy and conventional energy resource Unit Combination and generation schedule a few days ago coordination excellent Change.

For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions：

The generation schedule preparation method of a kind of meter and direct current interaction is it is characterised in that comprise the steps：

01) constrained according to the system load demand of direct current receiving end electrical network, unit operation constraint, stand-by requirement constraint and receiving end Power system security constraints, set up and are subject to receive capability analysis into the minimum and maximum receiving end electrical network direct current as optimization aim of electricity with direct current Model；

02) according to receiving end electrical network direct current receive Capacity Analysis Model calculate direct current receiving end electrical network direct current receiving maximum and Minimum safe limit；

03) capacity consistency, the constraint of direct current Plan rescheduling are received according to direct current receiving end electrical network direct current, and sending end electrical network is System workload demand, stand-by requirement constraint, conventional power unit run constraint, new forms of energy power prediction result, sending end power system security constraints, Optimization aim is turned to new forms of energy maximum of dissolving, meter is sent using the direct current that sending end electrical network is worked out in mixed integer programming approach optimization Draw, the new forms of energy plan of exerting oneself, conventional energy resource Unit Commitment plan and the plan of exerting oneself.

Preferably, described receiving end electrical network direct current receiving Capacity Analysis Model is：

A) object function：

In formula, F1 receiving end electrical network direct current is entered minimum amount of power, and F2 is entered maximum electricity for sending end electrical network direct current；D is receiving end Electrical network is entered DC line set, and d represents a DC power transmission line, and T is to gather whole day all periods, and t represents a period； P (d, t) is the power planning in t for the DC line d, and H (t) is the time span of period t；

B) constraints：

1. receiving end network system workload demand constraint：

In formula, I is direct current receiving end electrical network unit set, and i is generating set, and pu (i, t) is that unit i exerts oneself meter in t Draw, L (t) is the load prediction after the other interconnection injecting power of receiving end electrical network t deduction；

2. receiving end electrical network unit operation constraint：

P_min(i,t)·u(i,t)≤pu(i,t)≤P_max(i,t)·u(i,t) (4)

In formula, P_min(i, t) and P_max(i, t) is respectively unit i in the t period adjustable bound exerted oneself, and u (i, t) is machine Group i is in the running status of t；

3. receiving end electrical network stand-by requirement constraint：

In formula：Withr(i, t) is that the upper rotation that can provide, backspin are standby in the t period for unit i；WithRT () is Rotation, backspin stand-by requirement on the system t period；

4. receiving end power system security constraints：

In formula, pf_ij,pf _ij ,Represent the trend power of branch road ij and forward and reverse limit value respectively.

Preferably, step 03) specifically include following steps：

A) object function：

In formula, F is sending end electrical network totle drilling cost；N is sending end electrical network unit set；C (i, t) is the generating in the t period for the unit i Cost；C^st(i, t) is Unit Commitment cost；Δ W (w, t) is new forms of energy unit w in the t time to be abandoned wind or abandons the punishment of light and become This；Δ D (d, t) is DC line d in t Plan rescheduling cost function；

B) constraints：

1. direct current Plan rescheduling constraint：

I) continuous time power adjustment direction constraint：

Define integer variable x (d, t), x⁺(d,t)、x^-As each period direct current, (d, t) sends whether power adjusts, is No positive adjustment, the mark of whether reversely adjustment, then

x⁺(d,t),x^-(d,t),x(d,t)∈{0,1} (14)

x⁺(d,t)+x^-(d, t)=x (d, t)≤1 (15)

Therefore, adjacent time interval can not be represented by incorgruous adjustment：

x⁺(d,t)+x^-(d,t+1)≤1 (16)

x⁺(d,t+1)+x^-(d,t)≤1 (17)

According to programming theory, x⁺(d,t)、x^-The value of (d, t) can be used the changing value of dc power p (d, t) and lead to Cross the 0-1 variable z introducing auxiliary¹(d,t)、z²(d, t) is constraining realization, as follows：

p(d,t)-p(d,t-1)≤M₁·z¹(d,t) (18)

x⁺(d,t)≥z¹(d,t) (19)

p(d,t-1)-p(d,t)≤M₂·z²(d,t) (20)

x^-(d,t)≥z²(d,t) (21)

z¹(d,t),z²(d,t)∈{0,1} (22)

M in formula₁、M₂For the constant making formula set up, the integer that more than 2 times of cut-off stream conveying power limit；

Ii) DC adjustment rate constraint：

The adjustment speed of the plan of adjacent time interval direct current t not can exceed that the limit value of DC operation mode, that is,：

p(d,t)-p(d,t-1)≤RU⁺(d,t)·H(t) (23)

p(d,t-1)-p(d,t)≤RU^-(d,t)·H(t) (24)

In formula, RU⁺(d,t)、RU^-(d, t) is the rising of direct current plan, fall off rate limit value；

Iii) direct current adjustment spacing constraint：

For keeping stablizing of direct current plan, after DC meter draws one time adjustment, at least one minimum time interval of even running, We are with 0-1 variable a⁺(d, t) and a^-(d, t) represents that direct current d plans whether start adjustment, whether terminate to adjust, then in the t period Direct current adjusts spacing constraint：

In formula, NT is direct current d minimum adjustment interval period number, and τ is the period；

According to programming theory, by introducing extra 0-1 variable y (d, t), then y (d, t), a⁺(d, t) and a^-(d,t) Value can use equation below constraint：

a⁺(d,t)≥x(d,t+1)-y(d,t) (26)

a^-(d,t)≥x(d,t)-y(d,t) (27)

y(d,t)≤x(d,t) (28)

y(d,t)≤x(d,t+1) (29)

y(d,t)≥x(d,t)+x(d,t+1)-1 (30)

a⁺(d,t),a^-(d,t),y(d,t)∈{0,1} (31)

Iv) direct current conveying Constraint：

In formula, ED () is maximum, minimum transaction electricity in planning cycle for the direct current d, T is whole day all periods Set；

2. direct current receiving end electrical network receives capacity consistency：

In formula, p ^e (d, t) is the safe upper and lower limit of the power that direct current receiving end electrical network receives direct current d, and η (d) is straight Stream transmission system transmission loss rate；

3. sending end network system account load balancing constraints：

In formula, LF (t) is sending end network system load；

4. new forms of energy EIAJ limit value constraint：

p_max(w, t)=p^f(w,t) (35)

In formula, p_max(w, t) is unit EIAJ, p^f(w, t) exerts oneself in the prediction of t for new forms of energy unit w；

5. sending end electrical network conventional power unit runs constraint：

P_min(i,t)·u(i,t)≤pu(i,t)≤P_max(i,t)·u(i,t) (36)

In formula, UT_iAnd DT_iIt is respectively the minimum available machine time of unit i and minimum downtime；τ is the period, y (i, τ), z (i, τ) is whether unit i had start, shuts down the indexed variable of behavior in the τ period, and,

y(i,t)+z(i,t)≤1 (39)

6. sending end network system stand-by requirement constraint：

7. sending end power system security constraints：

The physical model statistic property based on electrical network for the present invention, economic model parameter, network topology data, new forms of energy power prediction Data, load prediction data, electricity contract data etc., optimize Unit Combination state and unit output meter according to the principle determining Draw, obtain being applied to electrical network a few days ago, the result of calculation of in a few days management and running.Can be applicable to the provincial power network containing direct current delivery system Power scheduling control centre a few days ago, in a few days generation schedule optimization establishment business, using the method for the present invention, electrical network can be lifted Dissolve new forms of energy ability, optimize transregional direct current transportation plan transprovincially, greatly improve bulk power grid controling power and electric power resource be excellent Change allocative abilities.

The invention has the beneficial effects as follows：

Firstth, entered with direct current that electricity is maximum, minimum optimization aim, consider receiving end network system workload demand, Unit operation condition, system reserve demand and power system security constraints.

Secondth, by sending end electrical network new forms of energy dissolve maximization and energy-saving and emission-reduction for the purpose of, consider direct current Plan rescheduling Restricted model, system balancing constraint, unit operation constraint, new forms of energy run the constraintss such as constraint, electric network swim constraint.

3rd, adjust restricted model and model carried out with linearization process by setting up dc power plan, realize to straight Flow optimizing and revising of power planning.Under keeping power transmission amount in a basic balance, peak regulation is participated in it is achieved that new forms of energy by direct current plan Maximum of dissolving is dissolved, and reduces electrical network to conventional power unit stand-by requirement, improves the operational efficiency of conventional energy resource unit.

Ensure give/receiving end electric power netting safe running under the premise of, flexible arrangement direct current plan undertakes part peak regulation task, promote New forms of energy are dissolved, are reduced electrical network routine stand-by requirement, realize direct current and send plan, new forms of energy and conventional energy resource Unit Combination a few days ago outside Coordination optimization with generation schedule.

Brief description

Fig. 1 is the schematic diagram of the generation schedule preparation method of a kind of meter of the present invention and direct current interaction；

Fig. 2 is the schematic diagram of direct current Plan rescheduling segmentation cost factor of the present invention；

Fig. 3 is the schematic diagram of direct current plan Setup Cost function of the present invention.

Specific embodiment

With specific embodiment, technical solution of the present invention is described in further detail below in conjunction with the accompanying drawings, so that ability The technical staff in domain can be better understood from the present invention and can be practiced, but illustrated embodiment is not as the limit to the present invention Fixed.

A kind of meter and the generation schedule preparation method of direct current interaction, as shown in figure 1, comprise the steps：

01) constrained according to the system load demand of direct current receiving end electrical network, unit operation constraint, stand-by requirement constraint and receiving end Power system security constraints, set up and are subject to receive capability analysis into the minimum and maximum receiving end electrical network direct current as optimization aim of electricity with direct current Model；

02) according to receiving end electrical network direct current receive Capacity Analysis Model calculate direct current receiving end electrical network direct current receiving maximum and Minimum safe limit；

03) capacity consistency, the constraint of direct current Plan rescheduling are received according to direct current receiving end electrical network direct current, and sending end electrical network is System workload demand, stand-by requirement constraint, conventional power unit run constraint, new forms of energy power prediction result, sending end power system security constraints, Optimization aim is turned to new forms of energy maximum of dissolving, meter is sent using the direct current that sending end electrical network is worked out in mixed integer programming approach optimization Draw, the new forms of energy plan of exerting oneself, conventional energy resource Unit Commitment plan and the plan of exerting oneself.

It is specifically described as follows：

It is that the day part obtaining receiving end power grid security receives direct current plan that receiving end electrical network direct current receives the purpose of capability analysis Safe upper limit value and lower limit value, the present invention is based on security constrained economic dispatch (SCED) model, is entered electricity with direct current maximum, minimum Optimization aim, carries out receiving end electrical network direct current and receives capability analysis, analysis process does not consider the change of receiving end electrical network Unit Combination plan Change.

Described receiving end electrical network direct current receives the Capacity Analysis Model to be：

A) object function：

It is minimum that direct current receives lower safety limit analysis target to be entered electricity for whole day all periods direct current：

It is maximum that direct current receives upper safety limit analysis target to be entered electricity for whole day all periods direct current：

In formula, F1 is entered minimum amount of power for receiving end electrical network direct current, and F2 is entered maximum electricity for receiving end electrical network direct current, D be by End electrical network is entered DC line set, and d represents a DC power transmission line, and T is to gather, when t represents one whole day all periods Section；P (d, t) is the power planning in t for the DC line d, and H (t) is the time span of period t；

B) constraints：

1. receiving end network system workload demand constraint：

In formula, I is direct current receiving end electrical network unit set, and i is generating set, and pu (i, t) is that unit i exerts oneself meter in t Draw, L (t) is the load prediction after the other interconnection injecting power of receiving end electrical network t deduction；

2. receiving end electrical network unit operation constraint：

P_min(i,t)·u(i,t)≤pu(i,t)≤P_max(i,t)·u(i,t) (4)

In formula, P_min(i, t) and P_max(i, t) is respectively unit i in the t period adjustable bound exerted oneself, and u (i, t) is machine Group i is in the running status of t；

3. receiving end electrical network stand-by requirement constraint：

In formula：Withr(i, t) is that the upper rotation that can provide, backspin are standby in the t period for unit i；WithRT () is Rotation, backspin stand-by requirement on the system t period；

4. receiving end power system security constraints：

In formula, pf_ij,pf _ij ,Represent the trend power of branch road ij and forward and reverse limit value respectively.

Step 03) in, the optimization aim that sending end electrical network is planned a few days ago is whole day all periods the minimization of total system cost.Sending end Electrical network totle drilling cost includes conventional power unit cost of electricity-generating and start-up and shut-down costs, new forms of energy are abandoned wind, abandoned light punishment cost and direct current output meter Draw Setup Cost, because new forms of energy unit cost of electricity-generating and start-up and shut-down costs are 0, and abandon wind, abandon light and will produce extra cost, because This this target implies to be realized new forms of energy and exerts oneself maximum planned target.

A) object function：

In formula, F is sending end electrical network totle drilling cost, and N is sending end electrical network unit set；C (i, t) is the generating in the t period for the unit i (fuel) cost；C^st(i, t) is Unit Commitment cost；Δ W (w, t) is abandoned wind in the t time or is abandoned punishing of light for new forms of energy unit w Penalize cost；Δ D (d, t) is DC line d in t Plan rescheduling cost function.

When unit is abandoned wind or abandoned light punishment cost more than direct current Plan rescheduling Price factor, system is sent optimizing direct current Plan receives ability to improve new forms of energy.

Wherein, the adjustment amount of direct current plan can be described with equation below：

P (d, t)=p⁰(d,t)+Δp⁺(d,t)-Δp^-(d,t) (10)

Δp⁺(d,t),Δp^-(d,t)≥0 (11)

In formula, p⁰The DC line d that (d, t) is transregional power dispatching station to be assigned according to electricity transaction result is in the t period Original plan, p (d, t) be adjustment after direct current plan；Δp⁺(d,t)、Δp^-(d, t) is that d increases in the t period or reduces Plan electric power.

For embodying direct current Plan rescheduling amplitude affecting and avoiding meaningless direct current Plan rescheduling to cost, we introduce Direct current Plan rescheduling segmentation Setup Cost factor lambda, the cost that this factor representation unitary DC Plan rescheduling system increases, λ is piecewise Linear increment, that is, direct current Plan rescheduling is bigger, and Setup Cost is higher, as shown in Figure 2.

Therefore, direct current plan Setup Cost function Δ D (d, t) (as shown in Figure 3) is represented by：

In formula, B is the total hop count of direct current plan Setup Cost function, and λ (d, s) is the tune in its piecewise function s section for the direct current d Whole cost factor, Δ p (d, s, t) be direct current d in the t period plan variable quantity in piecewise function s section, be nonnegative value；λ is The direct current Plan rescheduling segmentation Setup Cost factor.

B) constraints：

1. direct current Plan rescheduling constraint：

The present invention considers transmission system operation characteristic and transregional electricity transaction demand, proposes following direct current Plan rescheduling Constraint：

I) continuous time power adjustment direction constraint：

In order to protect stablizing of DC converter and direct current plan, adjacent time interval direct current plan can not incorgruous adjust.We Define integer variable x (d, t), x⁺(d,t)、x^-As each period direct current, (d, t) sends whether power adjusts, whether forward direction is adjusted Whole (increasing), the mark of whether reversely adjustment (minimizing), then

x⁺(d,t),x^-(d,t),x(d,t)∈{0,1} (14)

x⁺(d,t)+x^-(d, t)=x (d, t)≤1 (15)

Therefore, adjacent time interval can not be represented by incorgruous adjustment：

x⁺(d,t)+x^-(d,t+1)≤1 (16)

x⁺(d,t+1)+x^-(d,t)≤1 (17)

According to programming theory, x⁺(d,t)、x^-The value of (d, t) can be used the changing value of dc power p (d, t) and lead to Cross the 0-1 variable z introducing auxiliary¹(d,t)、z²(d, t) is constraining realization, as follows：

p(d,t)-p(d,t-1)≤M₁·z¹(d,t) (18)

x⁺(d,t)≥z¹(d,t) (19)

p(d,t-1)-p(d,t)≤M₂·z²(d,t) (20)

x^-(d,t)≥z²(d,t) (21)

z¹(d,t),z²(d,t)∈{0,1} (22)

M in formula₁、M₂For the big constant making formula set up, typically take and exceed direct current and convey the whole greatly of more than 2 times of power limit Number, makes direct current arbitrary neighborhood period dc power variable quantity be less than M₁、M₂, such as can be with value 10000.

Ii) DC adjustment rate constraint：

The adjustment speed of the plan of adjacent time interval direct current t not can exceed that the limit value of DC operation mode, that is,：

p(d,t)-p(d,t-1)≤RU⁺(d,t)·H(t) (23)

p(d,t-1)-p(d,t)≤RU^-(d,t)·H(t) (24)

In formula, RU⁺(d,t)、RU^-(d, t) is the rising of direct current plan, fall off rate limit value；

Iii) direct current adjustment spacing constraint：

For keeping the stablizing of direct current plan, DC meter draw one time adjustment (single or multiple continuous times rising or under Fall) after, at least one minimum time interval of even running, we are with 0-1 variable a⁺(d, t) and a^-(d, t) represents direct current d plan Whether start adjustment, whether terminate to adjust in the t period, then direct current adjustment spacing constraint is：

In formula, NT is direct current d minimum adjustment interval period number, and τ is the period；

According to programming theory, by introducing extra 0-1 variable y (d, t), then y (d, t), a⁺(d, t) and a^-(d,t) Value can use equation below constraint：

a⁺(d,t)≥x(d,t+1)-y(d,t) (26)

a^-(d,t)≥x(d,t)-y(d,t) (27)

y(d,t)≤x(d,t) (28)

y(d,t)≤x(d,t+1) (29)

y(d,t)≥x(d,t)+x(d,t+1)-1 (30)

a⁺(d,t),a^-(d,t),y(d,t)∈{0,1} (31)

Iv) direct current conveying Constraint：

Direct current is sent electricity plan outside and is mainly determined by transregional power market transaction at present, for ensureing the execution of transaction, plan In cycle direct current always send electricity should be in the range of market transaction contract engagement.

In formula, ED () is maximum, minimum transaction electricity in planning cycle for the direct current d, T is whole day all periods Set；

2. direct current receiving end electrical network receives capacity consistency：

I.e. direct current receives upper and lower limit scope in receiving end power grid security after sending power deduction loss (loss on transmission, line loss),

In formula, p ^e (d, t) is the safe upper and lower limit of the power that direct current receiving end electrical network receives direct current d, and η (d) is straight Stream transmission system transmission loss rate (DC line line loss per unit and direct-flow inverter become loss rate sum), in the present invention, receiving end electricity Net receives the safe bound of direct current to receive Capacity Analysis Model to obtain by direct current receiving end electrical network.

3. sending end network system account load balancing constraints：

In formula, LF (t) is sending end network system load；

4. new forms of energy EIAJ limit value constraint：

p_max(w, t)=p^f(w,t) (35)

In formula, p_max(w, t) is unit EIAJ, p^f(w, t) exerts oneself in the prediction of t for new forms of energy unit w；

5. sending end electrical network conventional power unit runs constraint：

P_min(i,t)·u(i,t)≤pu(i,t)≤P_max(i,t)·u(i,t) (36)

In formula, UT_iAnd DT_iIt is respectively the minimum available machine time of unit i and minimum downtime；τ is the period, y (i, τ), z (i, τ) is whether unit i had start, shuts down the indexed variable of behavior in the τ period, and,

y(i,t)+z(i,t)≤1 (39)

6. system reserve constraint of demand：

7. sending end power system security constraints：

In addition to above-mentioned constraint, the generation schedule establishment a few days ago of sending end electrical network can also consider fuel about as needed further Other constraintss such as bundle, machine group constraint.Wherein, generation schedule preparation method is typically with 15 minutes logics for an optimization Period.

Using the meter of the present invention and the generation schedule optimization method of direct current interaction, knot can be predicted in new forms of energy short term power On the basis of fruit, take into full account that transregional direct current send/receiving end peak load regulation network and stand-by requirement, the transregional direct current of reasonable arrangement, conventional energy The plan of source unit and new forms of energy unit is exerted oneself, and improves electrical network new energy digestion capability and power network safety operation level.

The invention has the beneficial effects as follows：

Firstth, entered with direct current that electricity is maximum, minimum optimization aim, consider receiving end network system workload demand, Unit operation condition, system reserve demand and power system security constraints.

Secondth, by sending end electrical network new forms of energy dissolve maximization and energy-saving and emission-reduction for the purpose of, consider direct current Plan rescheduling Restricted model, system balancing constraint, unit operation constraint, new forms of energy run the constraintss such as constraint, electric network swim constraint.

3rd, adjust restricted model and model carried out with linearization process by setting up dc power plan, realize to straight Flow optimizing and revising of power planning.Under keeping power transmission amount in a basic balance, peak regulation is participated in it is achieved that new forms of energy by direct current plan Maximum of dissolving is dissolved, and reduces electrical network to conventional power unit stand-by requirement, improves the operational efficiency of conventional energy resource unit.

Ensure give/receiving end electric power netting safe running under the premise of, flexible arrangement direct current plan undertakes part peak regulation task, promote New forms of energy are dissolved, are reduced electrical network routine stand-by requirement, realize direct current and send plan, new forms of energy and conventional energy resource Unit Combination a few days ago outside Coordination optimization with generation schedule.Can be applicable to provincial power network power scheduling control centre containing direct current delivery system a few days ago, Business is worked out in a few days generation schedule optimization.

These are only the preferred embodiments of the present invention, not thereby limit the present invention the scope of the claims, every using this Equivalent structure or equivalent flow conversion that bright description and accompanying drawing content are made, or it is related to be directly or indirectly used in other Technical field, be included within the scope of the present invention.

Claims (5)

1. the generation schedule preparation method of a kind of meter and direct current interaction is it is characterised in that comprise the steps：

01) constrained according to the system load demand of direct current receiving end electrical network, unit operation constraint, stand-by requirement constraint and receiving end electrical network Security constraint, sets up and is subject to receive capability analysis mould into the minimum and maximum receiving end electrical network direct current as optimization aim of electricity with direct current Type；

02) Capacity Analysis Model is received to calculate the minimum and maximum of direct current receiving end electrical network direct current receiving according to receiving end electrical network direct current Safe limit；

03) capacity consistency, the constraint of direct current Plan rescheduling, and the system of sending end electrical network is received to bear according to direct current receiving end electrical network direct current Lotus demand, stand-by requirement constraint, the constraint of conventional energy resource unit operation, new forms of energy power prediction result, sending end power system security constraints, Optimization aim is turned to new forms of energy maximum of dissolving, meter is sent using the direct current that sending end electrical network is worked out in mixed integer programming approach optimization Draw, the new forms of energy plan of exerting oneself, conventional energy resource Unit Commitment plan and the plan of exerting oneself；

Step 03) specifically include following steps：

A) object function：

$\min F=\underset{t=1}{\overset{T}{\Σ}}\underset{i=1}{\overset{N}{\Σ}}\left(C\right(i,t)+C^{st}(i,t\left)\right)+\underset{t=1}{\overset{T}{\Σ}}\underset{w=1}{\overset{W}{\Σ}}\mathrm{\Δ}W(w,t)+\underset{t=1}{\overset{T}{\Σ}}\underset{d=1}{\overset{D}{\Σ}}\mathrm{\Δ}D(d,t)---\left(9\right)$

In formula, F is sending end electrical network totle drilling cost；N is sending end electrical network unit set；C (i, t) becomes for the generating in the t period for the unit i This；C^st(i, t) is Unit Commitment cost；Δ W (w, t) abandons wind or the punishment cost abandoning light for new forms of energy unit w in the t period； Δ D (d, t) is DC line d in t period Plan rescheduling cost function；D is sending end electrical network to receiving end electrical network DC line set； W is the set of new forms of energy unit；

B) constraints：

1. direct current Plan rescheduling constraint：

I) continuous time power adjustment direction constraint：

Define integer variable x (d, t), x⁺(d,t)、x^-Just whether whether (d, t) send power as each period direct current and adjust, To adjustment, the mark that whether reversely adjusts, then

x⁺(d,t),x^-(d,t),x(d,t)∈{0,1} (14)

x⁺(d,t)+x^-(d, t)=x (d, t)≤1 (15)

Therefore, adjacent time interval can not be represented by incorgruous adjustment：

x⁺(d,t)+x^-(d,t+1)≤1 (16)

x⁺(d,t+1)+x^-(d,t)≤1 (17)

According to programming theory, x⁺(d,t)、x^-The value of (d, t) can with DC line d the t period power planning p (d, T) changing value by introducing the 0-1 variable z assisting¹(d,t)、z²(d, t) is constraining realization, as follows：

p(d,t)-p(d,t-1)≤M₁·z¹(d,t) (18)

x⁺(d,t)≥z¹(d,t) (19)

p(d,t-1)-p(d,t)≤M₂·z²(d,t) (20)

x^-(d,t)≥z²(d,t) (21)

z¹(d,t),z²(d,t)∈{0,1} (22)

M in formula₁、M₂For the constant making formula set up, the integer that more than 2 times of cut-off stream conveying power limit；

Ii) DC adjustment rate constraint：

The adjustment speed of adjacent time interval direct current plan not can exceed that the limit value of DC operation mode, that is,：

p(d,t)-p(d,t-1)≤RU⁺(d,t)·H(t) (23)

p(d,t-1)-p(d,t)≤RU^-(d,t)·H(t) (24)

In formula, RU⁺(d,t)、RU^-(d, t) is the rising of direct current plan, fall off rate limit value；H (t) is the time span of period t；

Iii) direct current adjustment spacing constraint：

For keeping stablizing of direct current plan, after DC meter draws one time adjustment, at least one minimum time interval of even running, we With 0-1 variable a⁺(d, t) and a^-(d, t) represents that DC line d plans whether start adjustment, whether terminate to adjust, then in the t period Direct current adjusts spacing constraint：

$a^{-}(d,t)+\underset{\mathrm{\τ}=t+1}{\overset{t+NT}{\Σ}}{a}^{+}(d,\mathrm{\τ})\≤1---\left(25\right)$

In formula, NT is DC line d minimum adjustment interval period number, and τ is the period；

According to programming theory, by introducing extra 0-1 variable y (d, t), then y (d, t), a⁺(d, t) and a^-The value of (d, t) Available equation below constraint：

a⁺(d,t)≥x(d,t+1)-y(d,t) (26)

a^-(d,t)≥x(d,t)-y(d,t) (27)

y(d,t)≤x(d,t) (28)

y(d,t)≤x(d,t+1) (29)

y(d,t)≥x(d,t)+x(d,t+1)-1 (30)

a⁺(d,t),a^-(d,t),y(d,t)∈{0,1} (31)

Iv) direct current conveying Constraint：

$\underset{\‾}{E}\left(d\right)\≤\underset{t=1}{\overset{T}{\Σ}}p(d,t)\·H\left(t\right)\≤\stackrel{\‾}{E}\left(d\right)---\left(32\right)$

In formula, ED () is maximum, minimum transaction electricity in planning cycle for the DC line d, T is whole day all periods Set；

2. direct current receiving end electrical network receives capacity consistency：

$\underset{\‾}{p^e}(d,t)\≤p(d,t)\·(1-\mathrm{\η}(d\left)\right)\≤\stackrel{\‾}{p^e}(d,t)---\left(33\right)$

In formula, p ^e (d, t) is the safe upper and lower limit of the power that direct current receiving end electrical network receives DC line d, and η (d) is straight Stream transmission system transmission loss rate；

3. sending end network system account load balancing constraints：

$\underset{i=1}{\overset{N}{\mathrm{\Σ}}}\mathrm{pu}(i,t)-\underset{d=1}{\overset{D}{\mathrm{\Σ}}}p(d,t)=\mathrm{LF}\left(t\right)---\left(34\right)$

In formula, LF (t) is sending end network system load；

4. sending end electrical network new forms of energy EIAJ limit value constraint：

p_max(w, t)=p^f(w,t) (35)

In formula, p_max(w, t) is unit EIAJ, p^f(w, t) exerts oneself for the prediction in the t period for the new forms of energy unit w；

5. sending end electrical network conventional energy resource unit operation constraint：

P_min(i,t)·u(i,t)≤pu(i,t)≤P_max(i,t)·u(i,t) (36)

$\underset{\mathrm{\τ}=t-{\mathrm{UT}}_i+1}{\overset{t}{\Σ}}y(i,\mathrm{\τ})\≤u(i,t),\∀i,t\∈\{{\mathrm{UT}}_i,...,T\}---\left(37\right)$

$\underset{\mathrm{\τ}=t-{\mathrm{UT}}_i+1}{\overset{t}{\Σ}}z(i,\mathrm{\τ})\≤1-u(i,t),\∀i,t\∈\{{\mathrm{DT}}_i,...,T\}---\left(38\right)$

In formula, P_min(i, t) and P_max(i, t) is respectively unit i in the t period adjustable bound exerted oneself, and u (i, t) exists for unit i The running status of t period；Pu (i, t) is unit i in the plan of exerting oneself of t period；UT_iAnd DT_iWhen respectively the minimum of unit i is started shooting Between and minimum downtime；τ is the period, and y (i, τ), z (i, τ) are whether unit i had start, shuts down the mark of behavior in the τ period Variable, and,

y(i,t)+z(i,t)≤1 (39)

6. sending end network system stand-by requirement constraint：

$\stackrel{\‾}{R}\left(t\right)\≤\underset{i=1}{\overset{N}{\Σ}}\stackrel{\‾}{r}(i,t)---\left(40\right)$

$\underset{\‾}{R}\left(t\right)\≤\underset{i=1}{\overset{N}{\Σ}}\underset{\‾}{r}(i,t)---\left(41\right)$

In formula,Withr(i, t) is that the upper rotation that can provide, backspin are standby in the t period for unit i；WithRWhen () is system t t Duan Shangxuan, backspin stand-by requirement；

7. sending end power system security constraints：

$\underset{\‾}{{\mathrm{pf}}_{ij}}\≤{\mathrm{pf}}_{ij}\left(t\right)\≤\stackrel{\‾}{{\mathrm{pf}}_{ij}}---\left(42\right)$

In formula, pf_ij(t),pf _ij ,Represent the trend power of branch road ij and forward and reverse limit value respectively.

2. the generation schedule preparation method of a kind of meter according to claim 1 and direct current interaction is it is characterised in that described be subject to End electrical network direct current receive Capacity Analysis Model be：

A) object function：

$\min F1=\underset{t=1}{\overset{T}{\Σ}}\underset{d=1}{\overset{D}{\Σ}}p(d,t)\·H\left(t\right)---\left(1\right)$

$\max F2=\underset{t=1}{\overset{T}{\Σ}}\underset{d=1}{\overset{D}{\Σ}}p(d,t)\·H\left(t\right)---\left(2\right)$

In formula, F1 is entered minimum amount of power for receiving end electrical network direct current, and F2 is entered maximum electricity for receiving end electrical network direct current, and D is sending end electricity Net represents a DC power transmission line to receiving end electrical network DC line set, d, and T is to gather whole day all periods, and t represents one Period；P (d, t) is the power planning in the t period for the DC line d, and H (t) is the time span of period t；

B) constraints：

1. receiving end network system workload demand constraint：

$\underset{i=1}{\overset{I}{\Σ}}pu(i,t)+\underset{d=1}{\overset{D}{\Σ}}p(d,t)=L\left(t\right)---\left(3\right)$

In formula, I is direct current receiving end electrical network unit set, and i is generating set, and pu (i, t) is unit i in the plan of exerting oneself of t period, L T () deducts the load prediction after other interconnection injecting powers for the receiving end electrical network t period；

2. receiving end electrical network unit operation constraint：

P_min(i,t)·u(i,t)≤pu(i,t)≤P_max(i,t)·u(i,t) (4)

In formula, P_min(i, t) and P_max(i, t) is respectively unit i in the t period adjustable bound exerted oneself, and u (i, t) exists for unit i The running status of t period；

3. receiving end electrical network stand-by requirement constraint：

$\stackrel{\‾}{R}\left(t\right)\≤\underset{i=1}{\overset{I}{\Σ}}\stackrel{\‾}{r}(i,t)---\left(6\right)$

$\underset{\‾}{R}\left(t\right)\≤\underset{i=1}{\overset{I}{\Σ}}\underset{\‾}{r}(i,t)---\left(7\right)$

In formula：Withr(i, t) is that the upper rotation that can provide, backspin are standby in the t period for unit i；WithRWhen () is system t t Duan Shangxuan, backspin stand-by requirement；

4. receiving end power system security constraints：

$\underset{\‾}{{\mathrm{pf}}_{ij}}\≤{\mathrm{pf}}_{ij}\left(t\right)\≤\stackrel{\‾}{{\mathrm{pf}}_{ij}}---\left(8\right)$

In formula, pf_ij(t),pf _ij ,Represent the trend power of branch road ij and forward and reverse limit value respectively.

3. a kind of meter according to claim 1 and 2 and the interactive generation schedule preparation method of direct current are it is characterised in that one The individual period is 15 minutes.

4. the generation schedule preparation method of a kind of meter according to claim 1 and direct current interaction is it is characterised in that work as unit When abandoning wind or abandoning light punishment cost more than direct current Plan rescheduling Price factor, send plan to improve newly by optimizing DC line The energy receives ability；

Wherein, the adjustment amount of direct current plan can be described with equation below：

P (d, t)=p⁰(d,t)+Δp⁺(d,t)-Δp^-(d,t) (10)

Δp⁺(d,t),Δp^-(d,t)≥0 (11)

In formula, p⁰The DC line d that (d, t) is transregional power dispatching station to be assigned according to electricity transaction result is initial the t period Plan, p (d, t) is the power planning in the t period for the DC line d；Δp⁺(d,t)、Δp^-(d, t) is d in the t period increase or The plan electric power that person reduces；

Direct current plan Setup Cost function Δ D (d, t) is：

$\mathrm{\Δ}D(d,t)=\underset{s=1}{\overset{B}{\Σ}}\mathrm{\λ}(d,s)\·\mathrm{\Δ}p(d,s,t)---\left(12\right)$

${\mathrm{\Δp}}^{+}(d,t)+{\mathrm{\Δp}}^{-}(d,t)=\underset{s=1}{\overset{B}{\Σ}}\mathrm{\Δ}p(d,s,t)---\left(13\right)$

In formula, B is the total hop count of direct current plan Setup Cost function, and λ (d, s) is the tune in its piecewise function s section for the DC line d Whole cost factor, Δ p (d, s, t) be DC line d in the t period plan variable quantity in piecewise function s section, be non-negative Value；λ is the direct current Plan rescheduling segmentation Setup Cost factor.

5. the generation schedule preparation method of a kind of meter according to claim 1 and direct current interaction is it is characterised in that carrying out When receiving end electrical network direct current receives capability analysis, analysis process does not consider the change of receiving end electrical network Unit Combination plan.