JP2010011670A - Method for preparing generator operational plan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for preparing a generator operational plan capable of preparing an operational plan in practical computing time by stochastically expressing one or more uncertain factors for determination of a significant solution. <P>SOLUTION: The method for preparing a generator operational plan includes: first repeated processing in which starting and stopping plan preparation means for each of generators is repeated while changing assumed conditions necessary for starting and stopping plan processing fluctuated and second repeated processing in which economical load distribution determination means for each of the generators is repeated while changing assumed conditions necessary for economical load distribution processing on each of a plurality of starting and stopping plans obtained by the first repeated processing. According to the method, statistical information is calculated for cost assessment or environmental assessment when the assumed conditions are changed on each of the starting and stopping plans. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for creating a generator operation plan in a power system, that is, a start / stop plan and an economic load distribution plan, and in particular, even under a situation in which various uncertainties such as power demand fluctuations are large. In addition, while satisfying various constraints such as supply and demand balance, various expected indicators such as fuel consumption cost, greenhouse gas emissions, and electricity trading cost will be reduced in terms of expected cost and risk for the operator's purpose. The present invention relates to a method and apparatus for creating a simple operation plan.

  In order to maintain the reliability of the power system, it is necessary to create a start-up / stop plan for a generator that ensures an adequate reserve capacity while matching the power demand with the supply capacity of the generator. In order to operate at the same time as reliability, it is necessary to plan the shutdown of the generator so that the power generation cost is minimized. In recent years, there has been a need to minimize not only the power generation cost but also the greenhouse gas generated by the power generation action.

  In preparing such a generator operation plan, a start / stop plan that is a large-scale combination problem is a particularly important technology. For example, the total number of combinations of starting and stopping for 24 hours with 10 thermal power generators is 10 to the 72nd power. In fact, it is impossible to find the optimal solution by checking all combinations. Therefore, it is impossible to create an economic load distribution plan for determining the output of each generator that is most economical after determining start and stop.

  Therefore, for example, searching for a solution of an effective combination problem by using a heuristic technique such as Patent Document 1 or a combination problem optimization technique such as tab search as described in Patent Document 2 is being studied. . Based on the startup / shutdown pattern obtained in this way, a method has been adopted in which a generator operation plan that minimizes the cost under given conditions is created.

JP 2001-2111548 A JP 2001-258157 A

  In the prior art described above, it is necessary to express the input conditions deterministically. For example, with regard to power demand, one scenario is prepared that is deterministic about the daily change in predicted demand. In this way, mathematical programming calculations aiming at cost minimization are performed under the conditions of the assumed scenario.

  However, in practice, the generator operation plan needs to be formulated under uncertainty. For example, in the planning stage, it is necessary to use a predicted numerical value related to power demand at a certain future time. Since this includes forecast errors, in general, one scenario is deterministically determined that demand is slightly higher, and the power generation plan is solved for this scenario. Yes.

  On the other hand, in recent years, it can be said that the uncertainty surrounding the generator operation plan tends to increase further. For example, along with the liberalization of power, it is assumed that power price fluctuations of interchanged power through power transactions will occur and affect the power generation plan. In addition, there are uncertainties such as failure of the power supply operated by the IPP business operator and fluctuations in fuel prices in the medium to long term. In addition, the amount of distributed power sources, such as wind power generation and solar power generation, which are uncontrollable and have large output fluctuations, continues to increase.

  When a safe side scenario is assumed for all of these uncertain factors as in the past, there is a strong possibility that only an inefficient solution is required. In the worst case, a valid solution may not be found.

  Therefore, the present invention provides a generator operation plan creation method that enables an operation plan to be created within a realistic calculation time by obtaining an effective solution by stochastically expressing one or more uncertain factors. For the purpose.

  The generator operation plan creation method of the present invention is obtained by a first iterative process in which the start / stop plan creating means of each generator is repeated while changing an assumed condition necessary for the start / stop plan process, and the first iterative process. Each of a plurality of startup / shutdown plans is configured with a second iterative process that repeats the economic load distribution determination means of each generator while fluctuating assumptions necessary for the economic load distribution process, Probabilistic statistical information related to cost evaluation or environmental evaluation in the case where an assumed condition varies for each plan is calculated.

  Further, the power demand fluctuation factor is adopted as an assumption condition necessary for the start / stop planning process and the economic load distribution determination, and an assumption condition is created by random number processing using a probability fluctuation model of power demand fluctuation. .

  Further, the power generation output fluctuation factor of the power generation device using natural energy is adopted as an assumption condition necessary for the start / stop planning process and the economic load distribution determination, and the assumption condition is obtained by random number processing using a probability fluctuation model of power generation output fluctuation. It is characterized by creating.

  In addition, as a necessary condition for the start / stop planning process and the economic load distribution determination, a consumer's power consumption behavior variation factor for the change of the power rate contract content is adopted, and a random variation process is performed using a probability variation model of a power demand variation. An assumption condition is created.

  In addition, when creating the assumptions necessary for the start / stop plan process by random number processing, statistical information is held on the boundary point on the supply and demand balance where the generator configuration of the start / stop plan changes, and from the statistical information A probability distribution obtained by synthesizing a probability distribution obtained and a probability distribution defined for each assumption condition item is used.

  Further, as the stochastic statistical information regarding the cost evaluation, an expected value / dispersion value and a VaR value in a predetermined confidence interval are used for the power generation cost or the fuel cost / start / stop cost.

In addition, as the stochastic statistical information regarding the environmental evaluation, an expected value / dispersion value and a VaR value in a predetermined confidence interval are used for the greenhouse gas emission amount or the CO ₂ emission amount.

  In addition, when calculating the stochastic statistical information related to the cost evaluation or the environmental evaluation, a start / stop plan is selected according to selection condition selection regarding a data item in the statistical information specified separately.

  According to the present invention, an effective solution can be obtained by stochastically expressing one or more uncertain factors, and an operation plan can be created in a realistic calculation time.

  An embodiment of the present invention will be described. A stochastic fluctuation model using probabilistic expressions is prepared for each input information related to the generator operation plan. A mechanism for automatically generating a number of future scenarios based on these probability variation models is also provided.

  As the first stage process, a process for formulating a large number of candidates for the start / stop plan from the input of these many future scenarios is performed. As described above, a lot of calculation time is required to solve the start / stop plan. When many future scenarios are generated by an approach such as a simple Monte Carlo simulation and the start / stop planning is repeated for each of them, there is a possibility that it cannot be solved in a realistic calculation time. On the other hand, the supply / demand balance fluctuation factor that is sufficiently small compared to the generator capacity can be considered to have no effect on the required start-up / stop plan even if it is ignored. Therefore, as a method for generating a future scenario in the first stage processing, a mechanism that focuses only on a large supply and demand fluctuation factor that can obtain different start / stop plans is provided.

  As the second stage process, a process of evaluating in detail each of the plurality of start / stop plan candidates obtained in the first stage process is performed. Calculation at this stage is centered on economic load allocation, so there is little concern about the amount of calculation and time. Therefore, a mechanism for generating a future scenario in detail for each probability variation model and evaluating each of the start / stop plan candidates is provided. In this evaluation, since it is evaluated by a number of future scenarios, it is shown in a statistical expression. For example, in the evaluation of the total fuel cost, there is provided a mechanism capable of evaluating not only the expected value of cost reduction but also the degree of variation. In addition, in this evaluation index, a mechanism is provided for not only minimizing costs but also considering other indices such as greenhouse gas emissions.

  By configuring the generator operation plan creation device having the above functions, it is possible to formulate an operation plan in accordance with the operator's intention while taking into account various uncertainties.

  By the first stage processing as described above, it is possible to obtain a plurality of solution candidates related to the start / stop plan within a calculation time that can be realized within a range of assumed scenarios. Furthermore, by the second stage processing as described above, it is possible to obtain detailed evaluation for each of the solution candidates related to the plurality of start / stop plans obtained by the first stage processing by a number of future scenarios. Detailed evaluations can be obtained as statistical values related to evaluation indexes such as fuel costs and greenhouse gas emissions.

  The evaluation of the plurality of operation plan candidates obtained in this way can be determined based on the relationship between risk and profit. For example, a high-risk, high-return operation plan where the expected value of fuel cost is small but the cost rises in the unlikely event is high, and conversely, a low-risk low-return where the expected value is slightly large but the risk of cost rise is small An operational plan can be obtained.

  As described above, according to the present invention, it is possible to create an operation plan in consideration of various uncertainties, and the most appropriate operation plan is determined according to the policy of the operator and the intention of the operator at the time of planning. It becomes possible to adopt.

  As an embodiment, a case where the present invention is applied to a generator operation plan creation device that creates an operation plan for a plurality of generators linked to a power system will be described.

The above apparatus is composed of a general computer system. That is, the computer system includes an arithmetic processor, a main storage device, an external storage device, and an output device such as a display that outputs information to an operator, and an input device such as a keyboard that receives information input.
A processing flow for creating an operation plan is executed on such a general computer system.

  The calculation procedure of this processing flow is shown in FIG.

  First, in process 0101, a generator characteristic reading process is performed. Various characteristics relating to fuel consumption for each generator stored as the data table 0102 are obtained from the database mounted in the external storage device. The specific contents of the data table are as shown in FIG.

  The data table 0102 is indexed by a unique identifier 1001 for each generator. In this data table, a generator name 1002, an output upper limit 1003, an output lower limit 1004, and a fuel cost calculation formula parameter 1005 are defined for each generator. In this embodiment, the fuel cost calculation formula cost (P) for the generator output P [MWh] is defined by the following quadratic function. These coefficient terms a, b, and c are stored in the data table.

cost (P) [¥] = a × P ² + b × P + c
In addition, various characteristics relating to the start / stop cost and the minimum operation time constraint are also stored in the data table 0102. In process 0101, all necessary generator characteristic data is read from this data table 0102.

  Next, in the loop process 0103, the start / stop pattern solution candidate creation in the process 0104 is repeatedly executed. As will be described later, the process 0104 includes a process for performing random behavior in order to simulate future uncertainty. Therefore, the loop process 0103 has a meaning like a Monte Carlo simulation. By such loop processing, a plurality of promising start / stop pattern solution candidates are created under conditions of future uncertainty, and stored as start / stop pattern solution candidates in the data table 0105 in the database. This loop process is repeated a predetermined number of times. However, since the start / stop pattern solution creation process 0104 generally requires a calculation time, the number of iterations reflecting it is set.

  Details of the process 0104 will be described with reference to FIG. First, a supply and demand balance is calculated by processing 0201. For this processing, the power demand fluctuation model 0202 and the new energy generation fluctuation model 0203 are referred to.

  The power demand can be statistically understood with an outline as shown in FIG. When the horizontal axis 0401 represents the hourly transition of the day and the vertical axis represents the amount of power demand at each hour, the expected value is shown as a tendency to increase in the daytime and decrease in the nighttime as shown by a curve 0403. It is. However, the curve 0403 is an assumption in the case of taking an average behavior, and in actuality, the demand amount may be up or down. According to statistical knowledge, such blurring can be caused by the difference between the temperature assumed at the planning stage and the temperature at the actual stage. For this reason, in most cases, there are strong factors that fluctuate up and down as a whole. For example, a curve 0404 can be obtained when a downward blur occurs, and a curve 0405 can be obtained when an upward blur occurs.

  Strictly speaking, even in the middle of a day, there is a case where the demand amount suddenly changes unexpectedly due to a sudden change in weather conditions or other unexpected events. Therefore, in order to construct a model that simulates actual demand fluctuations in detail, it is necessary to formulate not only large demand fluctuations for the entire day but also detailed fluctuations for each hour. However, the purpose of the processing 0104 here is to make a start / stop plan for the entire day. As a sudden change in demand that occurs in the middle of the day, it is difficult to assume that there will be a magnitude that will affect the start / stop plan. Therefore, in this embodiment, the power demand model 0202 used in the process 0201 employs a simple simulation method that expresses the entire transition curve 0403 of the expected expected value of the power demand amount only by moving it up and down. .

  In general, errors in demand forecasts can be organized in a normal distribution. As shown in FIG. 5, when the horizontal axis 0501 is the logarithm of the demand amount and the vertical axis is the occurrence frequency, it can be expressed as a curve 0503. Here, the center 0504 corresponds to the expected demand value, and the deviation 0505 from the center 0504 corresponds to the demand prediction error.

  Therefore, the power demand model 0202 performs the following processing. First, the expected demand amount data de (t) is given between times t = 1 to 24 using a profile corresponding to an average expected demand curve 0403 as data. In addition, for each time, the magnitude of variance corresponding to the prediction error is also given as data ds (t). Then, using the random function nd () according to the normal distribution of size 1, the assumed demand amount dn (t) is calculated as follows.

ln (dn (t)) = ln (de (t)) + nd () × ln (ds (t)) t = 1-24
Here, ln () represents a natural logarithmic function. nd () does not depend on the time t, but adopts one value per day. By such processing, it is possible to probabilistically generate an assumed demand amount dn (t) in which the expected demand is fluctuated up and down as a whole. The estimated demand thus obtained can also be handled as the output of the power demand model 0202.

  However, in consideration of the fact that the model is intended for a start / stop plan, there is a possibility that wasteful processing may be performed if processing is simply performed as described above. The reason for this is that, from the viewpoint of the power supply configuration of the entire power system, generators with large capacity and high power generation efficiency are preferentially used, and generators with small capacity and low power generation efficiency are used depending on the situation. Can be mentioned. Therefore, where the demand is small to some extent, several generators with large capacities are allocated as starter generators, so that even if the demand fluctuates somewhat, the generator configuration is hardly affected. On the contrary, when the demand is large to some extent, the configuration of the start / stop generator may change due to a slight change in the demand. As described above, when the fluctuation in demand is simulated evenly up and down, there is a risk that an assumption on the demand decrease side is unnecessarily calculated.

  In view of this, as an output of the power demand model 0202, processing for calculating an assumed demand amount is performed in consideration of the generator configuration. The selection status of the starter generator in a certain time section is schematically shown in FIG. The height of the rectangular figure 0601 indicates the amount of power that can be generated by one generator. Along the vertical axis 0602, the generators G1, G2, and G3 are stacked in descending order of power generation efficiency. Here, a boundary 0603 indicates a power generation limit of a certain generator combination. That is, it means that the combination of generators to be started is different between a demand amount lower than this boundary and a high demand amount. Hereinafter, the boundary is referred to as a power generation plan boundary.

  In the present embodiment, the power generation plan boundary is used to devise the calculation process of the assumed demand amount in the power demand model 0202. First, in the power demand model creation stage, 8756 hours of the year are divided into seasonal ranges and time ranges having similar tendencies that can be approximately the same power generation plan. Then, for each range, the generation plan boundary summarizes the occurrence situation. As shown in FIG. 7, a power generation plan boundary distribution curve 0703 is generated by taking the possible power generation amount on the horizontal axis 0701 and the occurrence frequency on the vertical axis 0702. This distribution curve is approximated to a linear or higher order expression.

  The power generation plan boundary distribution situation obtained in this way is used for the calculation process of the assumed demand amount in the power demand model 0202. The estimated demand amount dn (t) obtained by the above-described processing is further combined with the power generation plan boundary distribution as shown in FIG. 7, and is normalized so that the area, that is, the total occurrence frequency becomes 1. . By such processing, an occurrence frequency distribution as shown in FIG. 8 can be obtained. The horizontal axis 0801 is the assumed demand specialized for creating the start / stop plan, and the vertical axis 0802 means the frequency to be generated. In general, a curve such as a distribution curve 0803 is obtained that causes the upper blur side to occur frequently. In the present embodiment, the assumed demand d (t) generated according to this distribution is adopted as the assumed demand amount in the power demand model 0202. As a result, it is possible to execute a process of planning a solution for a startup / shutdown plan with high frequency for a demand fluctuation phenomenon that may affect the startup / shutdown plan and with a low frequency for those that do not.

  Similarly to the power demand fluctuation model 0202, the new energy generation fluctuation model 0203 models only a large demand fluctuation that can affect the start / stop planning. For example, in the simulation of wind power generation, the output fluctuation of medium to short cycle that is 20 minutes or less after the output fluctuation is subjected to frequency resolution is ignored in this embodiment. Only long-period components of 20 minutes or longer are extracted, and the size of each component is stored in the new energy generation amount fluctuation model 0203. As an output simulation for calculation, each component is synthesized after the phase of each component is shaken with a uniform random number. By such processing, the stochastic output fluctuation of the wind power generation amount is simulated.

  In the supply-demand balance calculation process 0201, the power generation amount generated according to the new energy power generation amount fluctuation model 0203 is subtracted from the demand amount generated according to the power demand amount fluctuation model 0202, and the remaining amount is set as the required supply amount.

  Next, a process 0204 defines the characteristics of the virtual power supply. In this embodiment, the DRP effect amount variation model 0205 is considered. Here, DRP refers to a demand response program. In order to simulate this behavior stochastically, a method of virtually handling it like a power supply and taking it into the operation plan creation calculation is adopted.

  First, in the DRP effect amount fluctuation model 0205, the effect of supply and demand balance is expressed based on the charge system of the demand reaction program. An incentive type charge menu is used as one of the common supply and demand reaction program forms. In this case, the consumer (final power consumer) can receive a fixed monetary reward by reducing a predetermined demand amount. By concluding such a charge special agreement, it becomes possible to request the customer to start the program in the event of an emergency. As a power company, when the demand for power reaches its peak in the year and the supply and demand are tight, it is possible to easily maintain a supply and demand balance without starting up a low-efficiency power source or purchasing a high unit price. In this way, the demand reaction program has the effect of reducing the amount of demand, and can be regarded as a power generation resource having the same amount of power generation capacity from a different perspective. However, since final decision making for demand reduction is left to the customer, not all the capacity concluded in the contract is reduced, and the effect can be expressed stochastically.

  This is shown in FIG. The horizontal axis 0901 indicates the amount of demand reduction by the demand reaction program. When replaced with a generator, it corresponds to the amount of power generated. The vertical axis 0902 indicates a reward to be paid to the customer as a compensation for the demand reduction. Replacing it with a generator corresponds to the power generation cost. Basically, since a reward corresponding to the amount of demand reduction is paid, the cost characteristic can be expressed in a form close to linear as shown by a line 0903. For example, plot 0904 is expressed as a constant demand reduction and a constant cost. However, as described above, demand reduction is often not implemented in some customers. From the standpoint of customers, there are times and timings when demand reduction cannot be implemented due to various circumstances of each customer. Therefore, in general, an optional clause is attached to the demand response program, and it is often possible to reject a demand reduction request with a predetermined penalty. If this is shown in FIG. 9, when demand reduction is refused with respect to the plot 0904, the position of the plot 0905 will be reached. However, since the cost is reduced by receiving the penalty, the position of plot 0906 is reached. In this way, the cost characteristic 0903 related to the entire contract amount transitions to another characteristic 0907.

  Based on the above arrangement, in the DRP effect variation model 0205, the rejection rate for the demand reduction request is expressed by a probability model. Similar to the prediction error distribution (FIG. 5) in the demand fluctuation model described above, the behavior of the customer can be expressed as a normal distribution. At each time of the loop processing 0104, the cost characteristic 0907 of the demand reaction program is calculated assuming a demand reduction request rejection rate by random number generation processing. This is regarded as a virtual generator and added to the generator fuel consumption data table as shown in a row 1006 in FIG.

  In addition to the demand response program described above, there are demand factors that fluctuate stochastically. For example, there are concerns about the impact on electric power generation plans for electric vehicles that are expected to spread in the future. Regarding the charging behavior of electric vehicles (starting time and length of time), a charge system that can be requested from an electric power company can be considered, as in the demand response program. In this case, the number of electric vehicles can be expressed by an established model, and the amount of charge at night can be simulated as a pumping action of a pumped storage power plant. It is also possible to create a generator operation plan that takes into account the uncertainty of charging behavior of electric vehicles.

  In this way, using the generator group to which the virtual generator is added in the process 0204, the start / stop plan creation calculation is performed in the process 0206 for the supply required amount obtained in the process 0201. Since the start / stop plan creation method here considers start / stop of the generator group having a definite characteristic with respect to a definitely determined supply and demand balance, the conventional method can be applied. That is, the start / stop solution can be obtained by using a known technique as described above in “Prior Art”. Since any method can be used, there is also an advantage that migration from an existing system becomes easy.

  In the next process 0207, a process of adding the start / stop pattern solution obtained in process 0206 to the database is performed. The start / stop pattern solution candidate obtained by one process in the loop process 0104 is information indicating the start / stop state for all the generators as shown in FIG. The identifier 1101 is a unique identifier for each generator, similarly to the identifier used in the generator fuel consumption characteristics of FIG. Queries between others and the data table are performed using this identifier as an index. In the start / stop state 1102, the start / stop state for each hour (0: stop, 1: start) is stored. A virtual generator such as a demand reaction program basically has no start / stop restrictions and has no fixed cost, and therefore can be considered as a generator in the above-mentioned start state. Therefore, a procedure for updating the data table in FIG. 11 is performed by adding information indicating that the virtual generator is always activated to the flag information in the range 1103 obtained as the activation / stop pattern solution.

  In this way, solution candidates are added each time the loop processing 0104 is performed. Information on these solution candidate groups is managed in a data table as shown in FIG. First, a unique index is assigned to each of the start / stop pattern solution candidates by the management number 1201. In addition to this, the outline information of the scenario used for generating the solution candidate is added. In the present embodiment, numerical values relating to the maximum demand 1202 and the deviation 1203 between the maximum demand and the expected demand are added from the demand fluctuation scenario. Details of the obtained solution candidates are linked to the data table of FIG. 11 by a pointer 1204.

  When adding solution candidates to the solution candidate management data table as shown in FIG. 12, solution candidates are screened. A similar start / stop pattern, that is, a case where the flag information in the range 1103 is completely the same, and a case where there is only a flag difference that is small in terms of cost are determined to be known solutions. Do not add candidates. By such screening, one or more start / stop pattern solution candidates having different properties are finally recorded in the solution candidate management data table of FIG.

  In the above embodiment, a method of repeatedly generating solution candidates by random behavior according to the probability distribution is adopted. However, as another means, there is a method of causing the inside of the probability distribution to behave in an exploratory manner. Specifically, it is checked whether a start / stop pattern that has not been obtained so far can be obtained by causing a fluctuation of a predetermined width in the upward blur or downward blur direction based on the expected value or the median value. Repeat the operation. A method of collecting one or more start / stop pattern solution candidates having different properties by repeating such exploratory processing within the confidence interval is also conceivable.

  As described above, by repeating the start / stop plan while changing the assumed conditions in the loop process 0104, a plurality of start / stop plan solution candidates are created. However, since the start / stop planning has a large calculation amount, there is a concern that it cannot be processed in a practical calculation time if it is simply repeated. Therefore, in the present embodiment, a contrivance such as focusing on only the demand fluctuation necessary for the start / stop plan is adopted instead of varying the various fluctuation factors in detail.

  As the next procedure, a plurality of start / stop pattern solution candidates managed in the solution candidate management data table of FIG. For each of the start / stop pattern solution candidates, a start / stop pattern solution candidate evaluation process 0110 is performed by the loop process 0108. Processing 0110 includes processing for performing random behavior to simulate future uncertainty. Therefore, the loop process 0108 has a meaning like a Monte Carlo simulation. By such a loop process, an economic or environmental evaluation of one start / stop pattern solution candidate is evaluated under conditions of future uncertainty.

  First, in step 0107, a start / stop pattern solution candidate is read from the database. As described above, a plurality of start / stop pattern solution candidates are stored in the database as a data table as shown in FIG. 11 by the loop processing related to the start / stop plan. In the loop process 0106, these are sequentially read and processed. Note that the virtual generator is not read here.

  Next, the start / stop pattern solution candidate evaluation process 0109 is performed by giving a stochastic behavior to the factor having uncertainty by the loop process 0108. Details of the process 0109 are shown in FIG.

  First, in process 0301, a supply and demand fluctuation balance is calculated. For this purpose, the power demand fluctuation model 0302 and the new energy generation fluctuation model 0303 are referred to.

  Similar to the power demand fluctuation model 0202 used in the above-described start / stop pattern solution candidate creation process 0105, the power demand fluctuation model 0302 is a probability fluctuation model with factors having uncertainty. However, it is not intended to create a start / stop plan here. Therefore, the demand fluctuation according to the statistics is basically simulated without devising the power generation plan boundary as employed in the demand fluctuation model 0202. That is, the demand fluctuation is generated by random number processing according to the distribution as shown in FIG. 5 instead of the distribution as shown in FIG. Similarly, for the new energy generation amount fluctuation model 0303, the output fluctuation according to the statistics is determined by random number processing. In the supply and demand fluctuation balance calculation process 0301, the necessary supply amount is calculated from the sum of these values.

  Also in the process 0304, a virtual generator is added in the same manner as the virtual power supply characteristic creation process 0204 in the above-described start / stop pattern solution candidate creation process 0105. Here, a virtual generator is added again using the DRP effect amount variation model 0205 used in the process 0204. The start / stop state is set as the start state for all time zones.

  In accordance with the configuration of the generator group including the virtual generator created in this way and the start / stop state thereof, the economic load distribution calculation is performed by the process 0305 for the supply necessary amount obtained in the process 0301. Since the economic load distribution method here determines the output distribution of the generator group having deterministic characteristics with respect to the definitely determined supply and demand balance, the conventional method can be applied. In other words, the generator output distribution can be determined by using a known technique as described above in “Prior Art”. Since any method can be used, there is an advantage that migration from an existing system is easy.

  In the next process 0306, a process of evaluating the start / stop pattern solution candidates and adding the result of the economic load distribution calculation obtained in process 0304 is performed. The economic load distribution result obtained by one process in the loop process 0108 is information indicating output distribution information related to the starter generator as shown in FIG. The identifier 1301 is a unique identifier for each generator, similarly to the identifier used in the generator fuel consumption characteristics of FIG. Queries between others and the data table are performed using this identifier as an index. The assigned output 1302 stores the output distribution assigned to the generators activated at each time. The power generation output is appropriately assigned to the virtual generator.

  Thus, evaluation results are added each time the loop processing 0108 is performed. The accumulation of these evaluation results is managed by a data table as shown in FIG. First, a unique index is assigned to each evaluation result by the management number 1401. In addition to this, scenario outline information 1402 used to obtain the evaluation result is added. In this embodiment, numerical values relating to the maximum demand are added from the demand fluctuation scenario. Details of the obtained evaluation result are linked to the data table of FIG. 13 by a pointer 1403. Furthermore, a representative evaluation index 1404 of economic efficiency and environmental performance in the evaluation result is added. Here, numerical values such as total cost data, breakdown of start-up costs, total CO2 emission data, etc. are added.

  As shown in FIG. 14, the evaluation result is added, and at the same time, the data table for statistically managing the evaluation result is updated. In this embodiment, a solution candidate evaluation result management table as shown in FIG. 15 is used. The management number 1501 is an index uniquely added to each start / stop pattern solution candidate and can be associated with the management number 1201 in FIG. Therefore, it can be grasped by referring to the data table in FIG. 12 what kind of generation condition the solution candidate is, and specifically how to start and stop at each time. In addition to this, statistical information 1502 of the evaluation result is stored. Each time the evaluation result of FIG. 14 is added by the loop processing 0108, processing for updating these values is performed. In this embodiment, a process of calculating the expected value (simple average), maximum / minimum value, value at risk (VaR) value, etc. of the total cost as representative numerical values and updating the statistical information 1502 is implemented.

  As described above, probabilistic evaluation of economic efficiency and environmental performance is performed for each of the solution candidates for the start / stop plan while changing the assumed conditions in the loop processing 0108. The evaluation result obtained here cannot simply determine superiority or inferiority. The evaluation of a plurality of operation plan candidates can be judged based on the relationship between risk and profit. For example, a high-risk, high-return operation plan where the expected value of fuel cost is small but the cost rises in the unlikely event is high, and conversely, a low-risk low-return where the expected value is slightly large but the risk of cost rise is small An operational plan can be obtained.

  Such a selection of a plurality of solutions is not of a property that can be uniquely determined by deterministic weighting, but should be determined depending on the business environment in which the business operator is placed from time to time. Therefore, the operator of the operation plan creation system of this embodiment inputs a solution condition that the operator wants to select at that time in step 0112.

  FIG. 16 shows an input screen of process 0112. The window 1601 has a GUI for inputting a plurality of selection conditions. First, statistical information to be evaluated is selected by a pull-down 1402. In this pull-down, the data items stored in the statistical information 1502 regarding the economic / environmental evaluation in FIG. 15 can be selected. For the selected data item, one solution selection condition is set by designating the selection of the magnitude relationship by the numerical value input field 1603 and the pull-down 1604. A plurality of selection conditions are set as required, and by pressing a button 1605, a solution candidate that satisfies the conditions is searched for and displayed in a table 1606 at the bottom of the window.

  In the table 1606, solution candidates for the start / stop plan are displayed in each row. Statistical information on economics and environmental performance is also displayed as a summary of the evaluation results. This information is a citation of the statistical information 1502 in the start / stop pattern solution candidate evaluation result of FIG. Data items that cannot be displayed due to screen drawing size restrictions can be viewed by operating the scroll bar 1607. In addition, the table 1606 includes a GUI included in a general tabular data sheet display function such as sorting. When a button 1608 is pressed, scenario overview information is referred to from the activation / stop pattern solution candidate management data table as shown in FIG. Similarly, when the button 1609 is pressed, as a detailed information of the start / stop pattern, a data table storing the start / stop state for the start / stop pattern solution candidate as shown in FIG. 11 is referred to and displayed on a pop-up window. By these operations, the operator selects the activation / deactivation plan determined to be most appropriate, and selects one of activation / deactivation by pressing the radio button 1610 and the button 1611.

  In the case of a generator operation plan creation method based on the definite condition input as in the prior art, there is a possibility that it cannot cope with the uncertainty of demand fluctuation that has been increasing in recent years. In particular, when a safe-side scenario is assumed for all uncertain factors as in the past, an inefficient solution may be calculated. In the worst case, a valid solution may not be found.

  In such a situation, by configuring the operation plan creation system of the present invention described above, an operation plan can be created in consideration of various uncertainties. In particular, by dividing the startup / shutdown plan calculation and economic load allocation calculation and executing a probabilistic planning method in two stages, the above-mentioned operation plan can be created in a realistic calculation time. .

  It is also possible to obtain a plurality of start / stop patterns at the same time and compare evaluations from a statistical viewpoint. It is possible to adopt the most appropriate operation plan according to the policy of the operator and the intention of the operator at the time of planning.

  Moreover, it is also a feature that any method can be used for any of the start / stop plans and the economic load distribution. Therefore, by incorporating the technique used in the existing system, there is an advantage that the influence on the operation work procedure etc. is minimized and the transition of the actual work is facilitated.

The whole flow of the generator operation plan preparation method of this invention. The flow of the starting / stopping pattern solution candidate creation processing of the present invention. The flow of a start / stop pattern solution candidate evaluation process of the present invention. Fluctuation in power demand for 24 hours a day (example). Distribution of power demand (example). Operation plan boundary (example). Operation plan boundary distribution (example). Distribution of assumed demand for start / stop plans (example). Effect of demand response program (example). Generator fuel consumption characteristics data table. Start / stop pattern solution candidate. Management table of start / stop pattern solution candidates. Output allocation management table by economic load distribution. Detailed evaluation table for start / stop pattern solution candidates. Evaluation result summary management table for start / stop pattern solution candidates. Selection condition input screen for starting / stopping pattern solution candidates.

Claims (8)

In the generator operation plan creation method,
A first iterative process that repeats the start / stop plan creation means of each generator while varying the assumptions necessary for the start / stop plan process;
For each of the plurality of startup / shutdown plans obtained in the first iterative process, a second iterative process that repeats the economic load distribution determining means of each generator while changing the assumptions necessary for the economic load distribution process. Configured,
A generator operation plan creation method characterized by calculating probabilistic statistical information on cost evaluation or environmental evaluation when an assumed condition fluctuates for each of the start / stop plans.   In Claim 1, adopting a power demand fluctuation factor as an assumption necessary for the start / stop planning process and the economic load distribution determination, and creating an assumption by random processing using a probability fluctuation model of power demand fluctuation Characteristic generator operation plan creation method.   The random number processing according to claim 1, wherein a generation output fluctuation factor of a power generation device using natural energy is adopted as an assumption necessary for the start / stop planning process and the economic load distribution determination, and a probability fluctuation model of the power generation output fluctuation is used. A generator operation plan creation method characterized by creating an assumed condition by   In Claim 1, the power consumption behavior fluctuation factor of the consumer with respect to the change of the electricity bill contract is adopted as an assumption condition necessary for the start / stop planning process and the economic load distribution determination, and a probability fluctuation model of power demand fluctuation is used. A generator operation plan creation method characterized by creating an assumed condition by random number processing.   5. The statistical information is held for a boundary point on the supply-demand balance where the generator configuration of the start / stop plan changes when the assumption condition necessary for the start / stop plan processing is created by random number processing. A generator operation plan creation method using a probability distribution obtained by combining a probability distribution obtained from the statistical information and a probability distribution defined for each assumption condition item.   2. The generator operation according to claim 1, wherein as the stochastic statistical information regarding the cost evaluation, an expected value / dispersion value and a VaR value in a predetermined confidence interval are used for power generation cost or fuel cost / start / stop cost. Planning method. The generator according to claim 1, wherein the stochastic statistical information regarding the environmental evaluation uses an expected value / dispersion value and a VaR value in a predetermined confidence interval for a greenhouse gas emission amount or a CO ₂ emission amount. Operation plan creation method.   In Claim 1, when calculating the stochastic statistical information regarding the said cost evaluation or environmental evaluation, according to selection condition selection regarding the data item in the separately specified statistical information, a start / stop plan is selected. Generator operation plan creation method.

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