CN102761124B - Method for predetermining power generation load of self-contained generator set - Google Patents
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Abstract
The invention discloses a method for predetermining the power generation load of a self-contained generator set, belonging to the technical field of power industry economic dispatching and comprising the following steps: dividing a self-contained generator set into a low-cost unit and a high-cost unit; determining the power generation load of a low-cost generator set, acquiring a new power utilization load curve, determining the power generation load of a high-cost generator set, marking points on the power generation load, and dividing the new load curve into at least one section; setting the value of any moment in the time period on the power generation load curve of each high-cost unit as the optimal power generation load value; acquiring the time required by each high-cost unit in the transition process of load adjustment and the number of points on a power generation load curve; translating the power generation load curve of each transition process backwards for at least one unit time according to the time sequence; and taking the power generation load curve of each high-cost unit corresponding to the lowest total cost. By the method, the external electricity purchasing cost can be reduced under the condition that the self-generating level of an enterprise is basically unchanged, so that the total electricity consumption cost of the enterprise is reduced.
Description
Technical field
The invention belongs to power industry economization dispatching technique field, particularly a kind of method that pre-determines house generator group generation load.
Background technology
In the last few years, under social economy's high speed development and the continuous background changing of Market Situation, energy-saving and cost-reducing, energy savings cost had become each Reducing Cost in Enterprises, improved the outstanding request of synthesized competitiveness.Along with residual heat and energy utilizes improving constantly of level, it is more and more higher that residual heat and energy reclaims the proportion of generating in the total electricity consumption of enterprise, but often only can meet enterprise and normally produce the part that required electric power is loaded, when each residual heat and energy reclaims the whole oepration at full load of generating set, enterprise still need be from a large amount of electric energy of electrical network outsourcing.In order further to reduce electric cost, some large size industrial enterprises are in paying attention to traditional residual heat and energy recovery generation technology, also build use conventional fuel, as the large capacity house generator group of coal, natural gas etc., substantially realized self power generation and can meet the condition of producing whole electricity consumptions.
Business electrical cost is generally by outer power purchase cost and self power generation cost structure.Because enterprise's outsourcing electric energy is generally taked the mode of Pinggu, peak pricing for segment, if day part is all bought identical electric energy from electrical network, the electric cost producing is by different.In the time that the self power generation ability of enterprise acquires a certain degree, in the situation that total electricity consumption is constant, adjust the size of spontaneous electric weight according to the height of outsourcing electricity price lattice, reduce the purchase of electricity of the period that electricity price is high, improve the purchase of electricity of the period that electricity price is low, can make self power generation level substantially constant, but outer power purchase cost is reduced, thereby reduces total electric cost.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method that pre-determines house generator group generation load, while reaching higher level for industrial enterprise's self power generation ability, determine preparation group of motors generation load curve plan separately.
The invention provides a kind of method that pre-determines house generator group generation load, comprising:
By enterprise separately preparation group of motors be divided into low cost unit and expensive unit according to cost of electricity-generating and enterprise from the big or small comparative result of external electrical network power purchase paddy section electricity price;
Determine the generation load of low cost generating set, obtain power load between the normal production period of arbitrary operation in the production process of enterprise and between turn(a)round and the relation curve of time, obtain business electrical load curve, by the numerical value of each point on power load curve deduct all low cost units the generation load value in this moment and, obtain new power load curve;
Point on described new power load curve is carried out to mark, be divided at least one section according to the described new power load curve of naming a person for a particular job of mark;
Obtain the size of the best generation load in the each section of arbitrary expensive unit, and the value in arbitrary moment in this section on the generation load curve of this unit is all set to described best generation load value, until obtain the generation load curve of every expensive unit whole day;
To the generation load curve of each expensive unit, obtain the required time of transient process of the each load adjustment of each unit, and each transient process contains the number of the point on generation load curve;
By the generation load curve of each transient process according to the time sequencing at least zero unit interval of translation backward;
Calculate respectively the different unit interval of each transient process translation when number, the size of the total electric cost of whole day, corresponding generation load curve while getting the lowest cost.
The invention provides the iron and steel enterprise of having a large-scale coal fired power generation unit and carry out self power generation load and optimize, formulate the enterprises method example of preparation group of motors load curve plan separately.Adopt according to the means of the different interval corresponding adjustment self power generation loads of enterprise's outsourcing electricity price, according to business electrical load plan and production maintenance plan, calculate the relation between the interior house generator group load of different time sections and electric cost, unit load size while obtaining day part the lowest cost, then determines total electric cost unit whole day load plan curve hour according to the dividing condition of each period.Application this method can reduce outsourcing electricity cost in the situation that keeping enterprise's self power generation level substantially constant, thereby reduce total electric cost of enterprise, the enterprise such as steel plant, petrochemical plant that is applicable to have large-scale house generator group, particularly coal fired power generation unit realizes cost-saving object.
Brief description of the drawings
Fig. 1 pre-determines the method flow diagram of preparation group of motors generation load separately for what the embodiment of the present invention provided;
Fig. 2 is the method flow diagram that calculates best generation load in a certain section in the embodiment of the present invention;
Fig. 3 is the Method And Principle schematic diagram that calculates best generation load in a certain section in the embodiment of the present invention;
Fig. 4 is the generative process principle schematic of transient process in the embodiment of the present invention;
Fig. 5 is the transient process Method And Principle schematic diagram of several unit interval of translation backward in chronological order in the embodiment of the present invention;
Fig. 6 is the principle schematic of three kinds of situations of transient process in the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
The embodiment of the present invention adopts according to the means of the different interval corresponding adjustment self power generation loads of enterprise's outsourcing electricity price, according to business electrical load plan and production maintenance plan, calculate the relation between the interior house generator group load of different time sections and electric cost, unit load size while obtaining day part the lowest cost, then determines total electric cost unit whole day load plan curve hour according to the dividing condition of each period.Application this method can reduce outsourcing electricity cost in the situation that keeping enterprise's self power generation level substantially constant, thereby reduce total electric cost of enterprise, the enterprise such as steel plant, petrochemical plant that is applicable to have large-scale house generator group, particularly coal fired power generation unit realizes cost-saving object.
What as shown in Figure 1, the embodiment of the present invention provided pre-determine the method for preparation group of motors generation load separately comprises:
Step 101, by enterprise, the cost of electricity-generating of preparation group of motors and enterprise sort according to order from low to high from the crest segment electricity price of external electrical network power purchase, flat section electricity price and paddy section electricity price separately.
Step 102, cost of electricity-generating is divided into low cost unit lower than the house generator group of power purchase paddy section electricity price, all the other house generator groups are divided into expensive unit.For all low cost units, the principle that all reaches real-time maximum generation ability according to whole day is determined the generation load of this unit.
Step 103, the production process of enterprise is decomposed into some operations, the power load between arbitrary operation normal production period and between turn(a)round and the relation curve of time are measured.According to the production maintenance plan of the each operation of enterprise, in conjunction with the relation curve situation of the power load between normal production period and between turn(a)round and time, enterprise's entirety power load and time relationship are predicted, obtain business electrical load curve.On curve, each point represents the size of certain total power load of moment enterprise, and on curve, the time interval size of arbitrary neighborhood point-to-point transmission is identical.By the numerical value of each point on business electrical load curve deduct all low cost units the generation load value in this moment and, obtain new power load curve.
Step 104, the maintenance scheduling that moment, low cost unit were planned/stopped to enterprise's production maintenance play/stop moment and enterprise from the moment of external electrical network power purchase price change, sort, and remove the moment wherein repeating according to time order and function order.
Step 105, for all expensive units, if consider the impact of the shift system in unit production process, moment after the sequence that the zero hour of the process of respectively relieving unit shift system being related to and the finish time and step 104 obtain compares, if the moment that has moment during the process of relieving in each moment after the sequence that step 104 obtains or repeat with the process zero hour of relieving, the finish time, remove moment during the process of relieving and the moment of repetition, retain and relieve the process zero hour and the finish time; If the moment that does not have moment during the process of relieving or repeat with the process zero hour of relieving, the finish time is removed relieve the process zero hour and the finish time, carry out next step 106.If do not consider the impact of the shift system in unit production process, do not carry out any processing, carry out next step 106.
Step 106, the result that step 105 is obtained sort according to time order and function order, and on the new power load curve that step 103 is obtained carry out mark with the identical point of each moment after sequence in time among a little.According to time order and function order, first point on the new power load curve obtaining from step 103 starts, be defined as the starting point of first period, on curve, search the point through mark according to time order backward, often find the point of a mark, terminal using this as the current period, finish the current period, and define a new period, starting point using this point as the new period, until while not passing through the point of mark on load curve, the terminal using last point on load curve as last period.So far, the new power load curve that step 103 obtains is divided into some sections, and each section all exists a starting point and terminal.
Step 107, the section partition method that the generation load curve of arbitrary expensive unit is obtained according to step 106 are carried out same division.Calculate the size of the best generation load in the each section of arbitrary expensive unit, and the value in arbitrary moment in this section on the generation load curve of this unit is all set to the best generation load value calculating, until obtain the generation load curve of every expensive unit whole day.
Fig. 2 is the method flow diagram that calculates best generation load in a certain section, the schematic diagram that Fig. 3 is the method, and the method comprises the following steps:
Step 1071, the maximum permissible load of determining every generating set and minimum permissible load, and the size of best generation load permissible accuracy.
Step 1072, set total generation load size of arbitrary moment in section and be the minimum permissible load size of each unit sum, as " minimum generation load " line in Fig. 3, and self power generation total amount in calculation of sector, as the region in Fig. 3 1..
Step 1073, to all moment in section, calculate the poor of arbitrary moment power load size and total generation load size.If power load size is greater than the size of total generation load, by cumulative difference, and by result divided by the section time, count this section from electrical network purchase of electricity, as the region in Fig. 3 2.; If power load size is less than the size of total generation load, difference is taken absolute value and is added up, and by result divided by the section time, count this section to mains supply amount, as the region in Fig. 3 3..
Step 1074, according to the formation of electric cost, self power generation total amount in the section that obtains by step 1072 and step 1073, from electrical network purchase of electricity with to the size of total electric cost in mains supply amount calculation of sector.
Step 1075, get the unit of the cost minimization that generates electricity under current each unit load level, the increase of being loaded, increment size is the best generation load curve of this unit permissible accuracy size, calculate after generation load increase, the self power generation total amount of all generating sets in section, and according to the method for step 1073 and step 1074, calculate from electrical network purchase of electricity, to the size of mains supply amount and total electric cost, until all units all reach maximum permissible load.As the process of " minimum generation load " in Fig. 3 → " load 1 " → " load 2 " → " maximum generation load ".
Step 1076, the payload of getting in step 1075 each unit in the situation of total electric cost minimum, be the best generation load of each unit in this section.
The generation load curve of arbitrary unit in step 108, all expensive unit that step 107 is obtained, in the time that the best generation load size of any two adjacent time intervals is not identical, show that this unit need experience a load adjustment process (hereinafter to be referred as " transient process ") and realize the variation of load.Size by each load variations amount divided by the generation load rate of change of every unit, obtains the required time of the each transient process of each unit.Each transient process required time, divided by the time length between two points (hereinafter to be referred as " unit interval ") on generation load curve, is obtained to the number that each transient process contains the point on generation load curve.The initial load size of each transient process unit is this transient process unit load size of previous stage, and stopping payload is the unit load size of this transient process the latter half.In transient process, the generation load of unit is loaded by initial load linear change to termination, as shown in Figure 4.
Step 109, to the each transient process relating in step 108, the moment that its load starts the to change initial time that is transient process.From initial time, by the unit generation load curve during each transient process according to time sequencing several unit interval of translation backward, and the payload of the part between the initial time of the transient process after initial time and the translation of transient process is set to the initial load of transient process on original load curve, as shown in Figure 5.The unit interval number of the initial time of transient process and translation should determine according to different situations such as the corresponding production maintenance of transient process, low cost unit maintenance or outsourcing electricity price change, and as shown in Figure 6, concrete grammar is:
If 1 does not consider the impact in the period of relieving in unit production process, determine as follows:
By calculated 1. production maintenance start the moment of maintenance, 2. declinable moment of moment, 3. outsourcing electricity price of returning to normal production and the point on generation load Plan Curve carry out according to time sequencing corresponding, and initial by overhauling/relieving, overhaul/relieve stop and electricity price change the moment altogether three kinds of states these points are carried out to mark.
1. the corresponding moment is transient process initial time, and the unit interval number of translation is zero, as shown in Fig. 6-a; 2. the corresponding moment is that transient process stops the moment, and the unit interval number of translation is zero, as shown in Fig. 6-b; 3. the corresponding moment is that transient process stops the moment, calculate the unit interval of translation when number, first calculate the time length of non-transient process in next time section, result and this transient process are compared, as shown in Fig. 6-c, get the smaller value wherein unit interval divided by unit load curve, result is rounded to numerical value, the part of not enough integer is got a complete unit interval.
If 2 consider the impact in the period of relieving in unit production process, during relieving, require unit load constant, determine as follows:
By calculated 1. production maintenance start the moment of maintenance, 2. return to normal production moment, 3. the process of relieving in unit three-shift system production process initial time, 4. declinable moment of termination moment, 5. outsourcing electricity price and the point on generation load Plan Curve of the process of relieving in unit three-shift system production process carry out according to time sequencing corresponding, and initial by overhauling/relieving, overhaul/relieve stop and electricity price change the moment altogether three kinds of states these points are carried out to mark.
And 4. 1. the corresponding moment is transient process initial time, and the unit interval number of translation is zero, as shown in Fig. 6-a; And 3. 2. the corresponding moment is that transient process stops the moment, and the unit interval number of translation is zero, as shown in Fig. 6-b; 5. the corresponding moment is that transient process stops the moment, calculate the unit interval of translation when number, first calculate the time length of non-transient process in next time section, result and this transient process are compared, as shown in Fig. 6-c, get the smaller value wherein unit interval divided by unit load curve, result is rounded to numerical value, the part of not enough integer is got a complete unit interval.
Step 110, calculate the different unit interval of each transient process translation when number respectively, the size of the total electric cost of whole day, corresponding generation load curve while getting the lowest cost.
Step 111, if the moment that last outsourcing electricity price of whole day changes is that crest segment is to paddy section, the best generation load of the each expensive unit step 107 being obtained is worked as preload according to each unit and is issued electric cost order from low to high, successively the generation load of unit minimum cost is increased, increment size is the best generation load curve of this unit permissible accuracy size, and redefine once the initial time of each transient process and the unit interval number of translation, the size of total electric cost while calculating respectively each transient process translation difference unit interval number, until all expensive units all reach identical with last period load.In all results, get total cost while reaching minimum value, corresponding each unit generation load curve is the best generation load curve of whole day with it.
Lift a concrete application example below and further set forth the method for preparation group of motors generation load separately that pre-determines that the embodiment of the present invention provides:
Certain steel plant's construction has 8 house generator groups, and wherein two 300MW coal fired power generation units are expensive unit, and all the other six generating sets are low cost unit.Each generating set is all carried out generation load curve system, and first point of load curve is 0:00, and later each moment corresponding to point is latter 15 minutes of previous corresponding moment, finishes to 24:00.The required precision of the generation load curve of 300MW unit is 10MW, and unit is produced by three-shift system, and handing-over schedule is respectively: 23:30-0:30,7:30-8:30,15:30-16:30, unit load remains unchanged during this time.
This steel plant's outsourcing electricity price range distributes as follows: crest segment: 8:00-11:00 and 18:00-23:00, flat section: 7:00-8:00 and 11:00-18:00, paddy section: 23:00-7:00 next day.
One day, this steel plant's operationpiston maintenance, repair time section is 8:00-20:00; Each generating set is all without scheduled overhaul.According to production maintenance plan, formulate the load curve of each generating set according to embodiment of the present invention method, implementation process is as follows:
Step 1, the value of each point on steel plant's power load curve is deducted to this moment generation load sum of each low cost unit, obtain new power load curve, for determining of two 300MW unit load curves.If the time interval on power load curve between two points is less than the time interval between two points on generation load curve, the part between two points on generation load curve is carried out to linear interpolation according to the moment of power load curve.
Step 2, by the calculated 1. production maintenance moment 8:00 that starts maintenance, 2. the moment 20:00 returning to normal production, 3. the initial time 23:30 of the process of relieving in unit three-shift system production process, 7:30, 15:30, 4. the termination moment 0:30 of the process of relieving in unit three-shift system production process, 8:30, 16:30, 5. the declinable 7:00 of outsourcing electricity price, 8:00, 11:00, 18:00, 23:00 with on generation load curve, carry out corresponding with nearest point of each moment, and sort according to time order and function, wherein start the moment 8:00 of maintenance and the moment that the declinable moment 8:00 of outsourcing electricity price is repetition, therefore only retain a 8:00 moment.Ranking results is for the first time: 0:30,7:00,7; 30,8:00,8.30,11:00,15:30,16:30,18:00,20:00,23:00,23:30.
Step 3, according to considering to relieve the impact of factor, during the relieving of 7:30-8:30, unit load is constant, removes the moment 8:00 being positioned at wherein; During 15:30-16:30 without maintenance start or stop moment, die fall to relieve the zero hour 15:30 and relieve stop moment 16:30.Ranking results is for the second time: 0:30,7:00,7; 30,8.30,11:00,18:00,20:00,23:00,23:30.
Step 4, by sequence after each point according to: a) maintenance initial time or relieve stop moment, i.e. 0:30 in step 3,8:30; B) maintenance stops moment or the initial time of relieving, i.e. 7:30,23.30,20:00; C) moment that outsourcing electricity price lattice change, i.e. 7:00,11:00,18:00,23:00, amounts to three kinds of states corresponding with these points respectively, between the point of any two sign states, is defined as a period.All periods are divided into: 0:00-0:30,0:30-7:00,7:00-7:30,7:30-8:30,8:30-11:00,11:00-18:00,18:00-20:00,20:00-23:00,23:00-23:30,23:30-24:00.
Step 5, arbitrary period that step 4 is obtained, calculate respectively two 300MW units (for example 200MW) from minimum load in this period, each load up 10MW, for example, until two units all reach in the process of the peak load (300MW) in this period, when total electric cost is minimum, two units payload separately, be the optimum load size of unit in this period, and by every unit on the load curve within this period the value of any point be made as this optimum load size.
The load curve of step 6, every 300MW unit that step 5 is obtained, calculates respectively the difference size of adjacent two period optimum loads, by difference divided by this unit the load adjustment speed in this period, obtain time of each transient process.For a) the class moment in step 4, transient process is initial in this moment, and the unit interval number of translation is zero; For b) the class moment in step 4, transient process finished in this moment, and the unit interval number of translation is zero; For c) the class moment in step 4, transient process initial condition is for to finish in this moment, then with period below in the time length of non-transient process compare, get smaller value, adjust speed divided by this section of time unit load, the number that obtains the unit interval of transient process translation, rounds numerical value by result, and the part of not enough integer is got a complete unit interval.Calculate by this principle the moment that each transient process starts.
Step 7, the load curve that step 5 is obtained, the moment that the each transient process obtaining according to step 6 starts and the unit interval number of translation, calculate respectively the different unit interval of each transient process translation when number, the size of total electric cost, gets each unit load curve corresponding to minimum value wherein.
Step 8, because outsourcing electricity price lattice change paddy section in 23:00 into by crest segment, therefore by two 300MW units separately on load curve the size of the optimum load calculating between period 23:00-23:30 and 23:30-24:00 successively increase 10MW, redefine the transient process initial time of day part and unit interval number that can translation, until two units payload within these two periods reaches the previous period, it is the optimum load size between 20:00-23:00, calculate load curve when wherein total cost is minimum, be the optimum load curve of two units.
These steel plant determine according to the method for the invention after the load curve of two 300MW units, the proportion of self power generation in total electricity consumption remains unchanged, the ratio of crest segment purchase of electricity in total purchase of electricity declines, the ratio of paddy section purchase of electricity in total purchase of electricity rises, the target that realized that self power generation cost does not raise, outer power purchase cost and total electric cost reduces.
In the present embodiment, self power generation is associated with total cost, minimum as guiding taking total electric cost, break to meet productive power needs, the self power generation proportion substantially constant in total electricity consumption and formulated the mode of self power generation plan as guiding, realize the economization of self power generation production scheduling process; Fully combine enterprise's production maintenance plan self power generation is regulated, improved the matching degree of self power generation and production process, self adaptation degree is high, has reduced production management personnel's working strength.The present embodiment, in significantly having reduced the electric cost of enterprise, has reduced load difference between network load peak and low ebb apart from size, has optimized operation of power networks process, has ensured safe, stable, the efficiently operation of electrical network.
Upper example is embodiments of the invention, is not intended to limit protection scope of the present invention.
Claims (11)
1. a method that pre-determines house generator group generation load, is characterized in that, comprising:
By enterprise separately preparation group of motors be divided into low cost unit and expensive unit according to cost of electricity-generating and enterprise from the big or small comparative result of external electrical network power purchase paddy section electricity price;
Determine the generation load of low cost generating set, obtain power load between the normal production period of arbitrary operation in the production process of enterprise and between turn(a)round and the relation curve of time, obtain business electrical load curve, by the numerical value of each point on power load curve deduct all low cost units the generation load value in this moment and, obtain new power load curve;
Point on described new power load curve is carried out to mark, be divided at least one section according to the described new power load curve of naming a person for a particular job of mark;
Obtain the size of the best generation load in the each section of arbitrary expensive unit, and the value in arbitrary moment in this section on the generation load curve of this unit is all set to described best generation load value, until obtain the generation load curve of every expensive unit whole day;
To the generation load curve of each expensive unit, obtain the required time of transient process of the each load adjustment of each unit, and each transient process contains the number of the point on generation load curve;
By the generation load curve of each transient process according to the time sequencing at least zero unit interval of translation backward;
Calculate respectively the different unit interval of each transient process translation when number, the size of the total electric cost of whole day, corresponding generation load curve while getting the lowest cost.
2. the method that pre-determines house generator group generation load according to claim 1, is characterized in that, the step of the generation load of described definite low cost generating set specifically comprises:
The mode that all reaches real-time maximum generation ability according to whole day for low cost unit is determined the generation load of this unit.
3. the method that pre-determines house generator group generation load according to claim 2, is characterized in that, describedly point on new power load curve is carried out to mark comprises:
The maintenance scheduling that moment, low cost unit were planned/stopped to enterprise's production maintenance plays/stops moment and enterprise from the moment of external electrical network power purchase price change, sorts, and remove the moment wherein repeating according to time order and function order; By on described new power load curve a little in the point identical with each moment after described sequence carry out mark.
4. the method that pre-determines house generator group generation load according to claim 3, is characterized in that, the generation load curve of each transient process backward when translation, is further comprised:
Payload between the initial time of the transient process on load curve originally after initial time and the translation of transient process is set to the initial load of transient process.
5. according to the method that pre-determines house generator group generation load described in claim 3 or 4, it is characterized in that, describedly sort and remove after the step in repetition moment according to time order and function order, also further comprise:
For expensive unit, if consider the impact of the shift system in unit production process, moment after the zero hour of the process of respectively relieving unit shift system being related to and the finish time and described sequence compares, if the moment that has moment during the process of relieving in each moment after sequence or repeat with the process zero hour of relieving, the finish time, remove moment during the process of relieving and the moment of repetition, retain and relieve the process zero hour and the finish time; If in the moment that does not have moment during the process of relieving or repeat with the process zero hour of relieving, the finish time, remove relieve the process zero hour and the finish time.
6. the method that pre-determines house generator group generation load according to claim 5, is characterized in that, described in after the step of corresponding generation load curve, also further comprise while getting the lowest cost:
If the moment that last outsourcing electricity price of whole day changes is that crest segment is to paddy section, the best generation load of each expensive unit is worked as to preload according to each unit and issue electric cost order from low to high, successively the generation load of unit minimum cost is increased, increment size is the best generation load curve of this unit permissible accuracy size, and redefine once the initial time of each transient process and the unit interval number of translation, the size of total electric cost while calculating respectively each transient process translation difference unit interval number, until all expensive units all reach identical with last period load, in all results, get total cost while reaching minimum value, corresponding each unit generation load curve is the best generation load curve of whole day with it.
7. the method that pre-determines house generator group generation load according to claim 6, is characterized in that, the described step that is divided at least one section according to the new load curve of naming a person for a particular job of mark specifically comprises:
According to time order and function order, first point on described new power load curve starts, be set as the starting point of first period, on curve, search the point through mark according to time order backward, often find the point of a mark, terminal using this as the current period, finish the current period, and define a new period, starting point using this point as the new period, until while not passing through the point of mark on load curve, the terminal using last point on load curve as last period.
8. the method that pre-determines house generator group generation load according to claim 7, is characterized in that, described in obtain the best generation load size of expensive unit step specifically comprise:
Determine maximum permissible load and the minimum permissible load of every generating set, and the size of best generation load permissible accuracy;
Set total generation load size of arbitrary moment in section and be the minimum permissible load size of each unit sum, and self power generation total amount in calculation of sector;
To all moment in section, calculate the poor of arbitrary moment power load size and total generation load size, if power load size is greater than the size of total generation load, difference is cumulative, and by result divided by the section time, be made as this section from electrical network purchase of electricity; If power load size is less than the size of total generation load, difference is taken absolute value and is added up, and by result divided by the section time, be made as this section to mains supply amount;
According to the formation of electric cost, by self power generation total amount in described section, from electrical network purchase of electricity with to the size of total electric cost in mains supply amount calculation of sector;
Get the unit of the cost minimization that generates electricity under current each unit load level, the increase of being loaded, increment size is the best generation load curve of this unit permissible accuracy size, the self power generation total amount of all generating sets in section after calculating generation load and increasing, from electrical network purchase of electricity, to the size of mains supply amount and total electric cost, until all units all reach maximum permissible load;
The payload of getting each unit in the situation of total electric cost minimum is the best generation load of each unit in this section.
9. the method that pre-determines house generator group generation load according to claim 8, it is characterized in that, described in obtain the step that required time of the transient process of the each load adjustment of each unit and each transient process contain the number of the point on generation load curve and specifically comprise:
Size by each load variations amount divided by the generation load rate of change of every unit, obtains the required time of the each transient process of each unit; Each transient process required time, divided by the time length between two points on generation load curve, is rounded to numerical value by result, and the part of not enough integer is got a complete unit interval, obtains the number that each transient process contains the point on generation load curve.
10. the method that pre-determines house generator group generation load according to claim 9, is characterized in that, described by the generation load curve of each transient process backward translation at least the step of zero unit interval specifically comprise:
If do not consider the impact in the period of relieving in unit production process:
The calculated production maintenance moment, the moment returning to normal production, declinable moment of outsourcing electricity price that starts maintenance and the point on generation load Plan Curve are carried out according to time sequencing corresponding, and initial by overhauling/relieving, overhaul/relieve and stop and the electricity price variation moment is carried out mark to these points;
The calculated corresponding transient process initial time of moment that starts maintenance of production maintenance, the unit interval number of translation is zero; The corresponding transient process of moment returning to normal production stops the moment, and the unit interval number of translation is zero; The declinable moment of outsourcing electricity price, corresponding transient process stopped the moment, calculate the unit interval of translation when number, first calculate the time length of non-transient process in next time section, result and this transient process are compared, get the smaller value wherein unit interval divided by unit load curve, result is rounded to numerical value, and the part of not enough integer is got a complete unit interval.
11. methods that pre-determine house generator group generation load according to claim 9, is characterized in that, described by the generation load curve of each transient process backward translation at least the step of zero unit interval specifically comprise:
If consider the impact in the period of relieving in unit production process, during relieving, require unit load constant:
The termination moment of the process of relieving in initial time, the unit three-shift system production process of the process of relieving in the calculated production maintenance moment, the moment returning to normal production, unit three-shift system production process that starts maintenance, declinable moment of outsourcing electricity price and the point on generation load Plan Curve are carried out according to time sequencing corresponding, and initial by overhauling/relieving, overhaul/relieve and stop and the electricity price variation moment is carried out mark to these points;
The corresponding transient process initial time of termination moment of the process of relieving in calculated moment and the unit three-shift system production process that starts maintenance of production maintenance, the unit interval number of translation is zero; The corresponding transient process of initial time of the process of relieving in the moment returning to normal production and unit three-shift system production process stops the moment, and the unit interval number of translation is zero; The declinable moment of outsourcing electricity price, corresponding transient process stopped the moment, calculate the unit interval of translation when number, first calculate the time length of non-transient process in next time section, result and this transient process are compared, get the smaller value wherein unit interval divided by unit load curve, result is rounded to numerical value, and the part of not enough integer is got a complete unit interval.
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| US4324987A (en) * | 1978-05-26 | 1982-04-13 | Cyborex Laboratories, Inc. | System and method for optimizing shed/restore operations for electrical loads |
| CN102427249A (en) * | 2011-12-19 | 2012-04-25 | 天津市电力公司 | Method and system for controlling distributed micro-grid-connected operation |
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| US4324987A (en) * | 1978-05-26 | 1982-04-13 | Cyborex Laboratories, Inc. | System and method for optimizing shed/restore operations for electrical loads |
| CN102427249A (en) * | 2011-12-19 | 2012-04-25 | 天津市电力公司 | Method and system for controlling distributed micro-grid-connected operation |
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