CN102184468A - Active scheduling method for intermittent energy power generation - Google Patents

Abstract

The invention discloses an active scheduling method for intermittent energy power generation, comprising the following steps: setting three cycling power dispatching links, namely a day-ahead power generation plan, an intraday power generation plan and a real-time power generation plan; during the day-ahead plan stage, constructing a next-day day-ahead power generation plan model to obtain a next-day day-ahead power generation plan; during the intraday plan stage, constructing an intraday power generation plan model by taking deviation with the dayahead power generation plan to be minimum as a target on the basis of the on-off state and capacity of the intraday scheduling period of a unit provided by the day-ahead power generation plan to obtain an intraday power generation plan; and during the real-time plan stage, constructing a real-time power generation plan by taking deviation with the dayahead power generation plan to be minimum as a target on the basis of the on-off state and capacity of the intraday scheduling period of a unit provided by the dayahead power generation plan to obtain a real-time power generation plan. According to the active scheduling method, power grid operation uncertainty is lowered after intermittent energy power generation is accessed, intermittent energy power generation can be furthest accepted, and the safety and the economy of the power grid operation can be improved.

Description

The meritorious dispatching method of intermittent energy source generating

Technical field

The invention belongs to technical field of power dispatching automation, relate to a kind of meritorious dispatching method of intermittent energy source generating based on multicycle generation schedule coordination optimization.

Background technology

Generation schedule optimization establishment is the operating important process of electric power system dispatching, and economical operation has vital role to power grid security.Increasingly serious along with the energy and environment problem of global range, renewable energy power generations such as wind-powered electricity generation, photovoltaic generation were rapidly developed in recent years, and its proportion in system is more and more higher.But the intermittent energy source generating depends on the meteorological condition of variation, predictability is poor, have randomness, undulatory property, extensive intermittent energy source electricity generation grid-connecting has brought new challenge to generation schedule optimization establishment, to rationally the dissolving and dispatching of intermittent energy source generating, safe, reliable, the economical operation of total system had material impact.

Traditional meritorious scheduling is based on the reliability of power supply and the predictability of load, based on these 2, and the formulation of generation schedule and implemented reliable assurance.After adding extensive intermittent energy source generating in the system, the random fluctuation and the intermittence of intermittent energy source generating make its scheduling mode be different from conventional unit, will certainly bring difficulty to the formulation of grid generation plan and scheduling scheme.

Existing dispatching technique is when handling the generating of the batch (-type) energy, because of the batch (-type) energy generating precision of prediction of programming phase a few days ago lower, mainly be influence, adapt to the random fluctuation of batch (-type) energy generating by meritorious the exerting oneself of adjusting conventional unit in the generating of the batch (-type) of the programming phase consideration in real time energy.Existing dispatching method is based on the less situation of batch (-type) energy electricity generation grid-connecting capacity; after adding extensive batch (-type) energy generating in the system; the batch (-type) energy generating of extensive online has randomness; add the deviation of system loading prediction; if all sharing elimination in the generation schedule in real time; the situation of variable capacity deficiency occurs through regular meeting, influence the security and the economy of system.

Short Term Generation Schedules according to time span can be divided into a few days ago, in a few days with real-time a plurality of cycles, power system operating mode constantly changes, demand forecast, intermittent energy source generating precision of prediction span in time reduce and improve constantly, generation schedule optimization establishment is one and progressively advances and continuous meticulous process, how to realize a few days ago, the in a few days and real-time coordinate operation of generation schedule, to the lasting dynamic optimization of realizing generation schedule, admit the intermittent energy source generating significant to greatest extent.

The intermittent energy source generating has randomness and undulatory property, its meritorious exerting oneself is difficult to accurately predicting, when meritorious scheduling in real time, often on the basis of generation schedule a few days ago, by adjusting the load deviation that random fluctuation brought of exerting oneself the generating of the balance batch (-type) energy of conventional unit.This is also less to the influence of meritorious scheduling under the less situation of intermittent energy source generated energy, can satisfy general management and running requirement substantially.But for extensive batch (-type) energy electricity generation grid-connecting, because generating random wave momentum is bigger, after the stack of load prediction deviation, the numerical value of system's amount of unbalance is bigger, can cause bigger change to real-time plan; Further,, the situation of variable capacity deficiency occurs, influence the security and the economy of system through regular meeting if amount of unbalance all eliminating in real time in the works.

Summary of the invention

Technical matters to be solved by this invention is to provide a kind of meritorious dispatching method of taking into account extensive batch (-type) energy generating, situation of change and workload demand based on the different cycles power system operating mode predicted, intermittent energy source is generated electricity improving constantly of precision of prediction, by to a few days ago, in a few days, the real-time coordination optimization that goes forward one by one of generation schedule, realize the lasting dynamic optimization of generation schedule, and admit the intermittent energy source generating to greatest extent.

For solving the problems of the technologies described above, the present invention proposes a kind of meritorious dispatching method of intermittent energy source generating that is applicable to the dispatching of power netwoks operation, it is characterized in that, may further comprise the steps:

1) generation schedule a few days ago, in a few days generation schedule, the power scheduling link in three cycles of generation schedule in real time are set; Wherein, the scheduling time scope of generation schedule is following 1 all day a few days ago, and in a few days the scheduling time scope of generation schedule is following 8 hours, and the scheduling time scope of generation schedule is following 30 minutes in real time;

2) programming phase a few days ago, the dispatching center is according to next day unit maintenance plan and power system operating mode, and short-term load forecasting information, short-term batch (-type) energy generated output information of forecasting, take all factors into consideration the various constraint conditions of generation schedule establishment a few days ago, construct the model of generation schedule a few days ago of next day, and obtain the generation schedule a few days ago of next day, issue to power plant;

3) programming phase day: the unit that the dispatching center provides based on generation schedule a few days ago in a few days dispatching cycle the start and stop state and exert oneself, according to up-to-date load prediction information in a few days, in a few days up-to-date batch (-type) energy generated output information of forecasting, up-to-date power system operating mode in a few days, take all factors into consideration the various constraint conditions of generation schedule establishment in a few days, with with generation schedule deviation minimum a few days ago be target formation generation schedule model in a few days, and obtain generation schedule in a few days, issue to power plant;

4) real-time programming phase: the start and stop state in the unit Real-Time Scheduling cycle that the dispatching center provides based on generation schedule in a few days and exerting oneself, according to ultra-short term information, ultrashort phase batch (-type) energy generated output information of forecasting, the real-time grid method of operation, consider the constraint condition of real-time planning, with with generation schedule deviation minimum in a few days be the real-time generation schedule model of target formation, and obtain real-time generation schedule, issue to power plant.

The meritorious dispatching method of aforesaid intermittent energy source generating, it is characterized in that: in described step 2)-step 4) in, also comprise generation schedule a few days ago, the in a few days generation schedule and the coordination optimization that goes forward one by one of generation schedule in real time, the target of Optimization Model be the short period generation schedule and last one-period generation schedule the deviation minimum, long period generation schedule result directly enters the optimization aim and the restricted model of short period generation schedule, is that the Coordination and Optimization Model of going forward one by one of target is with the deviation minimum:

Objective function:

$\min F=\underset{t=1}{\overset{\mathrm{NT}}{\mathrm{\Σ}}}\underset{i=1}{\overset{\mathrm{NI}}{\mathrm{\Σ}}}{k}_i(p_{i,t}-p_{i,t}^d)$

Wherein, NT is a generation schedule calculated periods of time number, and NI is the unit number, p _{I, t}Expression unit i planned to exert oneself in the short period of t period,

Expression unit i planned to exert oneself k in the last one-period of t period _iDeviation is represented regulatory factor.

The meritorious dispatching method of aforesaid intermittent energy source generating, it is characterized in that: in described step 2)-step 4) in, constraint condition comprises the conventional constraint condition that security constraint unit Combinatorial Optimization Model is included, described conventional constraint condition comprises system balancing constraint, unit operation constraint, power grid security constraint etc., the intermittent energy source generating joins in the Optimization Model with the firm output form according to its power prediction information.

The meritorious dispatching method of aforesaid intermittent energy source generating, it is characterized in that: for the Optimization Model of setting up, if optimize the unit assembled state simultaneously and exert oneself, model is the combination of security constraint unit, employing mixed integer programming is found the solution, and determines current dispatching cycle unit day part start-stop state and meritorious exerting oneself; If only optimize unit output, model is the security constraint economic load dispatching, adopts linear programming to find the solution, and determines meritorious the exerting oneself of current dispatching cycle unit day part.

The meritorious dispatching method of aforesaid intermittent energy source generating, it is characterized in that: in described step 2) in the step 4), the up-to-date load prediction of each cycle, the prediction of batch (-type) energy generated output, up-to-date power system operating mode are adopted in generation schedule, generation schedule, generation schedule optimization in real time in a few days a few days ago.

The meritorious dispatching method of aforesaid intermittent energy source generating is characterized in that: in generation schedule and generation schedule optimization in a few days a few days ago, can select combination of security constraint unit or security constraint economic load dispatching according to service needed; In in real time generation schedule is optimized, select the security constraint economic load dispatching, only optimize that unit is meritorious exerts oneself, do not change the startup-shutdown scheme of unit.

The meritorious dispatching method of aforesaid intermittent energy source generating is characterized in that: the amount of unbalance equal proportion ground that the generation schedule Optimization Model is predicted load prediction between different cycles, the generating of the batch (-type) energy decomposes gives all available conventional units.According to k _iThe difference of value, minimum deflection target can have the adjusting pattern of multiple amount of unbalance:

k _i=1, equivalent is regulated;

k _i=p _{I, max}, wait the capacity ratio to regulate;

$k_i=p_{i,\max }-p_{i,t}^d,$ Regulate etc. the active volume ratio;

k _i=E _i, wait the electric weight ratio to regulate,

Wherein, p _{I, max}The upper limit of exerting oneself of expression unit i,

Expression unit i planned to exert oneself E in the last one-period of t period _iDeviation is represented the electric weight plan of unit i.

Method of the present invention has following characteristics and function:

1) can consider the continuous variation of power system operating mode, and load prediction precision, batch (-type) energy generated output precision of prediction in time span reduce and the characteristics that improve constantly, according to the scheduling of gaining merit of the up-to-date generator operation environment of system, obtain the strong generation schedule of feasibility.

2) by the coordination optimization of multicycle generation schedule, realize progressively becoming more meticulous of generation schedule establishment, eliminate the deviation of prediction step by step, reduce the uncertainty that the generating of the batch (-type) energy inserts the back operation of power networks, the increase system admits the ability of batch (-type) energy generating.

3) the resource distribution ability of generation schedule is stronger relatively a few days ago, in a few days, generation schedule is then more accurate to the consideration of security in real time, use the multicycle Coordination and Optimization Model of going forward one by one, behind batch (-type) energy electricity generation grid-connecting, make full use of the advantage of a cycle generation schedule, generation schedule is around optimizations of going forward one by one of generation schedule a few days ago in a few days, in real time, realized comprising the dynamic continuance optimization of the meritorious scheduling that the batch (-type) energy generates electricity.

The invention has the beneficial effects as follows through a few days ago, in a few days, the optimum decision link in real-time three cycles, adopt up-to-date method of operation information of each link and information of forecasting, continue to optimize around regulation goal, the meritorious scheduling of batch (-type) energy generating progressively carries out the transition to local fine optimization from integral macroscopic optimization.Power grid risk is shared in each link, and the uncertain of batch (-type) energy generating constantly reduces.Generation schedule will change in future of taking into account operation of power networks a few days ago, again by in a few days, optimizing and revising of generation schedule in real time, thereby guarantee the safe and reliable of generation schedule, and improved the ability that system admits the generating of the batch (-type) energy.

Embodiment

The present invention is based on the meritorious dispatching method of intermittent energy source generating of multicycle generation schedule coordination optimization.Be a preferred case study on implementation of the present invention below, comprised employing the inventive method, in the meritorious scheduling of intermittent energy source generating a few days ago, in a few days, the scheduling in real-time three cycles cooperates and coordinate, its feature, purpose and advantage can be found out from the explanation of embodiment.

In the dispatching of power netwoks operational process, need take precautions against the following various risk factors that may occur in service in conjunction with each period operation of power networks information, all kinds of generating resources of Optimization Dispatching are formulated rational generation schedule, realize the safety and economic operation of electrical network.

The meritorious dispatching method of batch (-type) energy generating of the present invention may further comprise the steps mainly based on multicycle generation schedule coordination optimization technology:

1) generation schedule a few days ago, in a few days generation schedule, the power scheduling link in three cycles of generation schedule in real time are set; Wherein, the scheduling time scope of generation schedule was 1 all day a few days ago, and in a few days the scheduling time scope of generation schedule is following 8 hours, and the scheduling time scope of generation schedule is following 30 minutes in real time.

2) programming phase a few days ago, the dispatching center is according to next day unit maintenance plan and power system operating mode, and short-term load forecasting information, short-term batch (-type) energy generated output information of forecasting, take all factors into consideration the various constraint conditions of generation schedule establishment a few days ago, construct the model of generation schedule a few days ago of next day, and obtain the generation schedule a few days ago of next day, issue to power plant.

Described turnaround plan comprises unit maintenance plan and Plant maintenance plan.In the generation schedule model, the unit that is overhauled is in stopped status in the maintenance period; Overhaul of the equipments information then is used for calculating the transmission capacity of electrical network section, and obtains the whole network topology.

Described short-term load forecasting information is the workload demand situation of 96 periods of next day of obtaining according to short-term load forecasting software; Short-term batch (-type) energy generated output information of forecasting is 96 meritorious predicted data of exerting oneself at each reporting scheduling center, batch (-type) energy generating plant.

The described model of generation schedule a few days ago is according to regulation goal and constraint condition; by batch (-type) energy generator group is treated to firm output; structure security constraint unit built-up pattern; use linear mixed integer programing solving-optimizing model, obtain each the unit startup-shutdown scheme of 96 periods of next day and the plan of exerting oneself.

3) programming phase day: the unit that the dispatching center provides based on generation schedule a few days ago in a few days dispatching cycle the start and stop state and exert oneself, according to up-to-date load prediction information in a few days, in a few days up-to-date batch (-type) energy generated output information of forecasting, up-to-date power system operating mode in a few days, with with generation schedule deviation minimum a few days ago be target formation generation schedule model in a few days, and obtain generation schedule in a few days, issue to power plant.

Load prediction information is the up-to-date workload demand situation in 8 hours futures obtaining according to short-term load forecasting software in described day; In a few days batch (-type) energy generated output information of forecasting is the up-to-date meritorious predicted data of exerting oneself in 8 hours futures at each reporting scheduling center, batch (-type) energy generating plant.

Generation schedule Model Optimization target be in a few days generation schedule and the deviation minimum of generation schedule a few days ago in described day, is that the Coordination and Optimization Model of going forward one by one of target is with the deviation minimum:

Objective function:

$\min F=\underset{t=1}{\overset{\mathrm{NT}}{\mathrm{\Σ}}}\underset{i=1}{\overset{\mathrm{NI}}{\mathrm{\Σ}}}{k}_i(p_{i,t}-p_{i,t}^d)$

Wherein, NT is a generation schedule calculated periods of time number, and NI is the unit number, p _{I, t}Expression unit i planned to exert oneself in the short period of t period,

Expression unit i planned to exert oneself k in the last one-period of t period _iDeviation is represented regulatory factor.For guaranteeing scheduling fairness, adopt equivalent to regulate pattern, the amount of unbalance of prediction decomposes equally to all available conventional unit, i.e. k _i=1.

Constraint condition comprises the conventional constraint condition that security constraint unit Combinatorial Optimization Model such as system balancing constraint, unit operation constraint, power grid security constraint comprise.The intermittent energy source generating joins in the Optimization Model with the firm output form according to its up-to-date power prediction information.

The generation schedule model is optimized the unit assembled state simultaneously and is exerted oneself in described day, and model is the combination of security constraint unit, adopts mixed integer programming to find the solution, and obtains each unit startup-shutdown scheme and the plan of exerting oneself of following 8 hours.

4) real-time programming phase: the start and stop state in the unit Real-Time Scheduling cycle that the dispatching center provides based on generation schedule in a few days and exerting oneself, according to ultra-short term information, ultrashort phase batch (-type) energy generated output information of forecasting, the real-time grid method of operation, consider the constraint condition of real-time planning, with with generation schedule deviation minimum in a few days be the real-time generation schedule model of target formation, and obtain real-time generation schedule, issue to power plant.

Described real-time load prediction information is the up-to-date workload demand situation in 30 minutes futures obtaining according to ultra-short term software; Batch (-type) energy generated output information of forecasting is the up-to-date meritorious predicted data of exerting oneself in 30 minutes futures at each reporting scheduling center, batch (-type) energy generating plant in real time.

Described real-time generation schedule Model Optimization target is real-time generation schedule and the deviation minimum of generation schedule in a few days, is that the Coordination and Optimization Model of going forward one by one of target is with the deviation minimum:

Objective function:

$\min F=\underset{t=1}{\overset{\mathrm{NT}}{\mathrm{\Σ}}}\underset{i=1}{\overset{\mathrm{NI}}{\mathrm{\Σ}}}{k}_i(p_{i,t}-p_{i,t}^d)$

Wherein, NT is a generation schedule calculated periods of time number, and NI is the unit number, p _{I, t}Expression unit i planned to exert oneself in the short period of t period, Expression unit i planned to exert oneself k in the last one-period of t period _iDeviation is represented regulatory factor.For guaranteeing scheduling fairness, adopt equivalent to regulate pattern, the amount of unbalance of prediction decomposes equally to all available conventional unit, i.e. k _i=1.

Constraint condition comprises the conventional constraint condition that security constraint unit Combinatorial Optimization Model such as system balancing constraint, unit operation constraint, power grid security constraint comprise.The intermittent energy source generating joins in the Optimization Model with the firm output form according to its up-to-date power prediction information.

Described real-time generation schedule model only optimizes that unit is meritorious exerts oneself, and model is the security constraint economic load dispatching, adopts linear programming to find the solution, and obtains each unit output plan of following 30 minutes.

Practical application effect

The technical program is economized in the electrical network Schedule System at certain and is applied.This system comprises a few days ago, in a few days, the generation schedule programmed function in a plurality of cycles such as real-time.The meritorious scheduling feature of batch (-type) energy generating is on to prospective project data integration basis, uses to realize on the basis of the present invention to multicycle generation schedule coordination optimization.

Analyze calculating execution result, plan a few days ago differs greatly with actual power curve, and the difference between plan in a few days, plan in real time and actual power curve reduces gradually, and simultaneity factor admits the ability of batch (-type) energy generating significantly to increase, and has improved the security and the economy of system's operation.

The meritorious dispatching method of batch (-type) energy generating based on multicycle generation schedule coordination optimization at following dispatching of power netwoks operation characteristic is found out in the research and the trial of the meritorious scheduling of batch (-type) energy generating that this method is carried out under the actual electric network data.This method is on the basis of multicycle generation schedule Optimization Model, by a few days ago, in a few days, the real-time coordination optimization that goes forward one by one of generation schedule, long period generation schedule result then directly enters the optimization aim and the restricted model of short period generation schedule, the short period generation schedule is around long period generating going forward one by one optimization, realize progressively becoming more meticulous of generation schedule establishment, eliminate the deviation of prediction step by step, reduce the uncertainty that the generating of the batch (-type) energy inserts the back operation of power networks, improve the security and the economy of operation of power networks.

According to specific exemplary case study on implementation the present invention has been described herein.Do not break away to one skilled in the art and carry out suitable replacement under the scope of the invention or modification is conspicuous.Exemplary case study on implementation only is illustrative, rather than to the restriction of scope of the present invention, scope of the present invention is by affiliated claim definition.

Claims (7)

1. the meritorious dispatching method of intermittent energy source generating is characterized in that, may further comprise the steps:

1) generation schedule a few days ago, in a few days generation schedule, the power scheduling link in three cycles of generation schedule in real time are set; Wherein, the scheduling time scope of generation schedule is following 1 all day a few days ago, and in a few days the scheduling time scope of generation schedule is following 8 hours, and the scheduling time scope of generation schedule is following 30 minutes in real time;

2) programming phase a few days ago, the dispatching center is according to next day unit maintenance plan and power system operating mode, and short-term load forecasting information, short-term batch (-type) energy generated output information of forecasting, take all factors into consideration the various constraint conditions of generation schedule establishment a few days ago, construct the model of generation schedule a few days ago of next day, and obtain the generation schedule a few days ago of next day, issue to power plant;

3) programming phase day: the unit that the dispatching center provides based on generation schedule a few days ago in a few days dispatching cycle the start and stop state and exert oneself, according to up-to-date load prediction information in a few days, in a few days up-to-date batch (-type) energy generated output information of forecasting, up-to-date power system operating mode in a few days, take all factors into consideration the various constraint conditions of generation schedule establishment in a few days, with with generation schedule deviation minimum a few days ago be target formation generation schedule model in a few days, and obtain generation schedule in a few days, issue to power plant;

4) real-time programming phase: the start and stop state in the unit Real-Time Scheduling cycle that the dispatching center provides based on generation schedule in a few days and exerting oneself, according to ultra-short term information, ultrashort phase batch (-type) energy generated output information of forecasting, the real-time grid method of operation, consider the constraint condition of real-time planning, with with generation schedule deviation minimum in a few days be the real-time generation schedule model of target formation, and obtain real-time generation schedule, issue to power plant.

2. the meritorious dispatching method of intermittent energy source generating according to claim 1, it is characterized in that: in described step 2) in the step 4), also comprise generation schedule a few days ago, the in a few days generation schedule and the coordination optimization that goes forward one by one of generation schedule in real time, the target of Optimization Model be the short period generation schedule and last one-period generation schedule the deviation minimum, long period generation schedule result directly enters the optimization aim and the restricted model of short period generation schedule, is that the Coordination and Optimization Model of going forward one by one of target is with the deviation minimum:

Objective function:

$\min F=\underset{t=1}{\overset{\mathrm{NT}}{\mathrm{\Σ}}}\underset{i=1}{\overset{\mathrm{NI}}{\mathrm{\Σ}}}{k}_i(p_{i,t}-p_{i,t}^d)$

Wherein, NT is a generation schedule calculated periods of time number, and NI is the unit number, p _{I, t}Expression unit i planned to exert oneself in the short period of t period,

Expression unit i planned to exert oneself k in the last one-period of t period _iDeviation is represented regulatory factor.

3. the meritorious dispatching method of intermittent energy source generating according to claim 1, it is characterized in that: in described step 2)-step 4) in, constraint condition comprises the conventional constraint condition that security constraint unit Combinatorial Optimization Model is included, described conventional constraint condition comprises system balancing constraint, unit operation constraint, power grid security constraint, the intermittent energy source generating joins in the Optimization Model with the firm output form according to its power prediction information.

4. the meritorious dispatching method of intermittent energy source generating according to claim 2, it is characterized in that: for the Optimization Model of setting up, if optimize the unit assembled state simultaneously and exert oneself, model is the combination of security constraint unit, employing mixed integer programming is found the solution, and determines current dispatching cycle unit day part start-stop state and meritorious exerting oneself; If only optimize unit output, model is the security constraint economic load dispatching, adopts linear programming to find the solution, and determines meritorious the exerting oneself of current dispatching cycle unit day part.

5. the meritorious dispatching method of intermittent energy source generating according to claim 2, it is characterized in that: in described step 2) in the step 4), the up-to-date load prediction of each cycle, the prediction of batch (-type) energy generated output, up-to-date power system operating mode are adopted in generation schedule, generation schedule, generation schedule optimization in real time in a few days a few days ago.

6. the meritorious dispatching method of intermittent energy source generating according to claim 4 is characterized in that: in generation schedule and generation schedule optimization in a few days a few days ago, select combination of security constraint unit or security constraint economic load dispatching according to service needed; In in real time generation schedule is optimized, select the security constraint economic load dispatching, only optimize that unit is meritorious exerts oneself, do not change the startup-shutdown scheme of unit.

7. the meritorious dispatching method of intermittent energy source generating according to claim 2, it is characterized in that: the generation schedule Optimization Model is decomposed the amount of unbalance equal proportion ground of load prediction between different cycles, batch (-type) energy generating prediction to all available conventional units, according to k _iThe difference of value, minimum deflection target have the adjusting pattern of multiple amount of unbalance:

k _i=1, equivalent is regulated;

k _i=p _{I, max}, wait the capacity ratio to regulate;

$k_i=p_{i,\max }-p_{i,t}^d,$ Regulate etc. the active volume ratio;

k _i=E _i, wait the electric weight ratio to regulate,

Wherein, p _{I, max}The upper limit of exerting oneself of expression unit i,

Expression unit i planned to exert oneself E in the last one-period of t period _iDeviation is represented the electric weight plan of unit i.