CN103580021A - Method for optimizing inter-subarea tie line exchanged electricity based on marginal electricity generation energy consumption - Google Patents
Method for optimizing inter-subarea tie line exchanged electricity based on marginal electricity generation energy consumption Download PDFInfo
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Abstract
The invention provides a method for optimizing inter-subarea tie line next-day exchanged electricity based on marginal electricity generation energy consumption in an interconnected electric power system. The method comprises the following steps that firstly, the restraint of the upper limit and the restraint of the lower limit of the number of hours spent for electricity generation of one year of a thermal power station are considered, the purpose is that the electricity generation energy consumption of each subarea is the lowest, a forecast previous-day daily load curve of each subarea is combined, the starting capacity of the thermal power station and the working position of the thermal power station on the daily load curves are optimized initially, and each subarea is balanced on the spot; secondly, on the basis of a on-the-spot balance result of each subarea, according to the unit electricity generation energy consumption of a thermal power generating unit of each subarea, the working position of each thermal power generating unit and the tie line exchanged electricity are adjusted per hour, and therefore an inter-subarea tie line previous-day exchanged electricity curve is obtained. According to the method for optimizing the inter-subarea tie line next-day exchanged electricity based on the marginal electricity generation energy consumption, a tie line next-day exchanged electricity curve can be rapidly determined on the premise that the restraint of the tie line electricity transmitting capacity is considered, the electricity balance demand of a system and the electricity balance demand of each subarea can be met with the smallest electricity generation energy consumption, energy-saving electricity generation operation is achieved, and the total electricity generation energy consumption of the system is reduced to the maximum extent.
Description
Technical field
The present invention relates to Operation Technique of Electric Systems, particularly a kind of by stages interconnection Change Power optimization method based on limit generating energy consumption.
Background technology
Due to the distribution character of china natural resources and the restriction of power industry technologies condition, in considerable time from now on, it can be master that domestic generating primary energy still be take coal and water.Current known domestic coal reserves approximately 2/3 is distributed in Shanxi, Shaanxi and Inner Mongol San Sheng, and available hydropower resources nearly 2/3 is distributed in Sichuan, Yunnan and Tibet San Sheng; Electric load approximately has the 2/3 East Coastal developed area being positioned at away from coal, water energy distributed area.This primary energy distributes and the mutually ununified contradiction of load center, need to lead to excess capacity, long distance power transmission solves, and in province interval, carries out exchange of electric power, the interconnected operation electrical network of formation nationwide.
By interconnection, carrying out the exchange of electric power of by stages, is the effective measures of optimizing allocation of resources, saving power generation energy resource.When take energy-saving power generation during as operational objective, the unit commitment operation that the grid company unit of giving priority in arranging for generating energy consumption is lower.If each subregion electrical network independent operating, high load capacity subregion often needs the unit's of putting into operation relatively high unit of generating energy consumption just can reach the requirement of systematic electricity balance, and underload subregion has the large capacity low energy consumption unit of part idle.If carry out exchange of electric power through by stages interconnection, low energy consumption unit generation is exerted oneself and is sent to high energy consumption subregion by interconnection, can improve the overall energy-saving benefit of electrical network, realize distributing rationally of by stages electric power resource.
At present, for the research of interconnected electric power system by stages interconnection Change Power optimization, mainly concentrate on interconnection and transmit electric power on being subject in the impact of electric subregion balance of electric power and ener and peak regulation balance, and the research of the Change Power optimization aspect, by stages of distributing for the operation of region total tune, unified electric load is also less.When interconnection Change Power is optimized, current strategy is mainly that as processed by the supplementary power supply of electric subregion, take to reach, required by electric regional power balance and peak regulation balance be optimization aim using interconnection, minute economizes in-situ balancing.This operational mode has hindered putting into operation of large capacity low energy consumption unit, does not give full play to the effect that interconnection is optimized electric power resource configuration.In fact, along with interconnected the deepening continuously and the deepening constantly of power market reform of domestic regional power grid, the electric load allocation model of subregion in-situ balancing will slowly be substituted, and the power balance in region-wide scope will become Developing mainstream.And the optimization of by stages interconnection Change Power can distribute by affecting the electric load of each subregion generating set, make interconnected electric power system reach the best running status of overall efficiency (as energy saving economy benefit).Therefore, the by stages interconnection Change Power optimization method of research taking into account system overall efficiency is significant.
Summary of the invention
Given this, object of the present invention provides a kind of by stages interconnection Change Power optimization method based on limit generating energy consumption, can not only under the prerequisite of considering interconnection Transmission Capacity Constraints, determine fast interconnection Change Power on next day, and can meet system and each regional power balance demand with minimum fired power generating unit generating energy consumption, realize energy-saving power generation operation, reduce to greatest extent the electric power system energy consumption of always generating electricity.
For realizing above goal of the invention, the present invention is achieved by the following technical solutions:
A by stages interconnection Change Power optimization method for limit generating energy consumption, comprises first electric load allocation optimized and the optimization of secondary power sharing of load, wherein,
Described first electric load allocation optimized comprises the following steps:
(1), subregion load prediction data are a few days ago prepared: by Short Term Load Forecasting System client, obtain respectively the daily load curve of prediction a few days ago that interconnection L to be optimized connects two subregion A, B, subregion A, B are respectively L at t load constantly
a(t), L
b(t);
(2), the preferential tagmeme sequence of unit load: obtain respectively two subregion A, B Zhong Ge fired power generating unit unit generating energy consumption, and sort according to the ascending preferential tagmeme of unit load that carries out respectively each subregion of unit generating energy consumption;
(3), thermal power station's start capacity is optimized: according to the preferential tagmeme of fired power generating unit load and two subregion thermoelectricitys on next day start capacity requirement, optimize respectively the start capacity of each subregion thermal power station, maximize electric power surplus in subregion;
(4), thermal power station service position is optimized: according to above each thermal power station's start capacity optimum results and the preferential tagmeme of fired power generating unit load, take in subregion and generate electricity energy consumption minimum as target, optimize respectively each service position of subregion thermal power station on subregion daily load curve; And,
The optimization of described secondary power sharing of load comprises the following steps:
(5), interconnection Change Power adjusts step-length setting: arrange and carry out the step delta P of interconnection Change Power while adjusting at every turn, and initialization period t=1;
(6), interconnection Change Power regularization condition judgement: generating energy consumption and the interconnection Transmission Capacity Constraints of fired power generating unit judge whether to meet t interconnection Change Power regularization condition constantly constantly according to two subregion t, if satisfied determine power transmission subregion S and be subject to electric subregion R, enter step (7), otherwise, t=t+1, enters step (8);
(7), interconnection Change Power is adjusted: by adjustment step delta P adjustment t, constantly send and be subject to electric subregion electric power, and revise t and constantly send and be subject to electric partition load, on revised load curve, by the preferential tagmeme of unit load, upgrade t and constantly send the service position of the residue start capacity part that is subject to electric subregion respectively to remain fired power generating unit on daily load curve;
(8), judge whether t is greater than 24, also the interconnection Change Power of all periods whether all adjusted is complete, if adjusted is complete, enter step (9), otherwise return to step (6);
(9), output by stages interconnection Change Power on next day optimum results, comprise by stages interconnection Change Power on next day curve and each fired power generating unit electric load distribution condition, and by this optimum results, carry out Unit Commitment adjustment and the preparation of operation fuel of each subregion thermal power station.
The present invention has following beneficial effect:
1, can determine fast interconnection Change Power on next day according to by stages fired power generating unit unit generating energy consumption, under the prerequisite of considering the constraint of interconnection transmission capacity, make the generator operation energy consumption of entire system minimum;
2, in first sharing of load optimizing process, considered that thermal power station's generating utilizes the constraint of hourage bound, by being reasonably set, thermal power station's generating utilizes hourage bound, can consider the various factors that affect operation of power networks, realize the multiple target joint coordination operation of electrical network integral body and optimize.
Accompanying drawing explanation
Fig. 1 is the inventive method flow chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated.
As shown in Figure 1, be the flow chart of by stages interconnection Change Power on the next day optimization method based on limit generating energy consumption in interconnected electric power system of the present invention.In figure, C
Δ PA+(t), C
Δ PA-(t) be respectively subregion A and at t, constantly increase/reduce the generating energy consumption that size increases/reduces after exerting oneself for the fired power generating unit of Δ P, C
Δ PB+(t), C
Δ PB-(t) be respectively subregion B and at t, constantly increase/reduce the generating energy consumption that size increases/reduces after exerting oneself for the fired power generating unit of Δ P, P
l(t) be interconnection L at Change Power constantly of t (while being carried to subregion B by subregion A with electric power for just), P
l.max+, P
l.max-be respectively the forward of interconnection L, the reverse upper limit that transmits electric power.
As mentioned above, this optimization method comprises first electric load allocation optimized and two processes of secondary power sharing of load optimization.First, start capacity and service position in each subregion daily load curve Shang， initial optimization thermal power station, each subregion in-situ balancing; Secondly, on the basis of this subregion in-situ balancing result, by a hour generating energy consumption for comparison two subregion fired power generating unit, progressively adjust thermal power station service position and interconnection Change Power, thereby obtain by stages interconnection Change Power on next day optimum results.Concrete steps are as follows:
(1), subregion load prediction data are a few days ago prepared: by Short Term Load Forecasting System client, obtain respectively the daily load curve of prediction a few days ago that interconnection L to be optimized connects two subregions (representing with alphabetical A, B below), subregion A, B are respectively L at t load constantly
a(t), L
b(t).
(2), the preferential tagmeme sequence of unit load: obtain respectively two subregion Zhong Ge fired power generating unit unit generating consumption information, and sort according to the ascending preferential tagmeme of unit load that carries out respectively each subregion of unit generating energy consumption.
(3), thermal power station's start capacity is optimized: i.e. fired power generating unit Combinatorial Optimization in subregion, according to the preferential tagmeme of fired power generating unit load and two subregion thermoelectricitys on next day start capacity requirement, optimize respectively in the steps below the start capacity of each subregion thermal power station, maximize electric power surplus in subregion.
A) according to the capacity of must starting shooting about definite each thermal power station of operation constraint
Minimum start capacity on each thermal power station next day is determined in the minimum start constraint (as thermoelectricity unit heating period must be started shooting) of An Ge thermal power station; Consider that each thermal power station year generating utilizes hourage lower limit (being converted into power station generated output every day lower limit) constraint, determine each thermal power station capacity of must starting shooting next day; According to subregion security personnel start constraint, determine that each thermal power station supplements start capacity next day.
B) by the best start capacity of each thermal power station of fired power generating unit load precedence bit optimization
Consider that the generating of thermal power station's year utilizes the hourage upper limit (being converted into the power station generated output every day upper limit) constraint, by the best on each thermal power station of the fired power generating unit load precedence bit optimization next day capacity of starting shooting.If now still cannot meet start capacity requirement, disregarding thermal power station's year generating and utilizing the constraint of the hourage upper limit, by the best on each thermal power station of the fired power generating unit load precedence bit optimization next day capacity of starting shooting.
(4), thermal power station service position is optimized: according to the preferential tagmeme of load of above each thermal power station's start capacity optimum results and fired power generating unit, in guaranteeing subregion on the basis of balance of electric power and ener, take in subregion and generate electricity energy consumption minimum as target, optimize respectively in the steps below each service position of subregion thermal power station on subregion daily load curve.
A) conventional coal electricity and thermoelectricity unit minimum technology are exerted oneself and are partly born base load
According to thermal power station, optimize start capacity, the conventional coal electricity of sequence arrangement and thermoelectricity unit minimum technology are exerted oneself and are partly born base load.
B) the non-start and stop peak regulation method operation of peak regulation fired power generating unit, minimum technology is exerted oneself and is partly born base load
If also there is base lotus position in subregion; according to the preferential tagmeme of fired power generating unit load; to meet each power station year generating, utilize the hourage upper limit to be constrained to condition, arrange successively to optimize in start capacity each start and stop coal electricity, combined cycle, fuel oil and combustion gas etc. partly or entirely the minimum technology of peak regulation fired power generating unit exert oneself and partly bear base load.
C) fired power generating unit is utilized the load of hourage lower limit by each power station year generating
According to the preferential tagmeme of fired power generating unit load, and take into account the generating of each thermal power station year and utilize the constraint of hourage lower limit, arrange successively from the bottom up each service position of fired power generating unit residue start capacity part on subregion daily load curve.For conventional coal electricity and thermoelectricity unit, residue start capacity partly refers to that the unit that deduction minimum technology is exerted oneself after part can be with exerting oneself; For peak regulation fired power generating unit, residue start capacity partly refers to that deduction is as stated above born the unit that the minimum technology of base load exerts oneself after part can be with exerting oneself.
D) fired power generating unit is utilized the load of the hourage upper limit by each power station year generating
According to the preferential tagmeme of fired power generating unit load, and take into account each thermal power station year generating and utilize the constraint of the hourage upper limit, the service position of the residue start capacity part that arranges successively from the bottom up respectively to remain fired power generating unit on subregion daily load curve.
E) fired power generating unit is pressed the load of regional power balance demand
According to the preferential tagmeme of fired power generating unit load, disregard the generating of each thermal power station year and utilize the constraint of the hourage upper limit, according to regional power balance demand, the service position of the residue start capacity part that arranges successively from the bottom up respectively to remain fired power generating unit on subregion daily load curve.
(5), interconnection Change Power adjusts step-length setting: arrange and carry out the step delta P of interconnection Change Power while adjusting at every turn, and initialization period t=1.Described step delta P is preferably the greatest common divisor of each fired power generating unit residue start capacity.
(6), interconnection Change Power regularization condition judgement: generating energy consumption and the interconnection Transmission Capacity Constraints of fired power generating unit judge whether to meet t interconnection Change Power regularization condition constantly constantly according to two subregion t, if satisfied judge power transmission subregion S, be subject to electric subregion R, enter next step, otherwise enter next interconnection Change Power adjustment optimization constantly.Can carry out t interconnection Change Power adjustment constantly one of meeting the following conditions:
A)C
Δ PA+(t) < C
Δ PB-(t) & P
l(t) < P
l.max+, subregion A is power transmission subregion, with alphabetical S, represents, subregion B, for being subject to electric subregion, represents with letter r;
B)C
Δ PA-(t) > C
Δ PB+(t) & P
l(t) >-P
l.max-, subregion A, for being subject to electric subregion, represents with letter r, subregion B is power transmission subregion, with alphabetical S, represents.
(7), interconnection Change Power adjusts: by adjusting step delta P, adjust t and constantly send and be subject to electric subregion electric power, and revise t and constantly send and be subject to electric partition load.On revised load curve, by the preferential tagmeme of unit load, upgrade t and constantly send the service position of the residue start capacity part that is subject to electric subregion respectively to remain fired power generating unit on daily load curve.
T constantly send and is subject to electric partition load adjustment computing formula to be
T constantly interconnection Change Power adjustment computing formula is
Wherein, L
s(t), L
r(t) be respectively the constantly electric subregion modified load of the power transmission subregion after last interconnection exchange of electric power/be subject to of t; L'
s(t), L'
r(t) be respectively the constantly electric subregion modified load of the power transmission subregion after this interconnection exchange of electric power/be subject to of t; P
l(t), P '
l(t) be respectively the interconnection Change Power after t moment last time/this interconnection exchange of electric power.
(8), judge whether that the equal adjusted of interconnection Change Power of all periods is complete, if adjusted is complete, enter next step, otherwise return to step (6), proceed to adjust.
(9), output by stages interconnection Change Power on next day optimum results, comprise by stages interconnection Change Power on next day curve and each fired power generating unit electric load distribution condition.According to this optimum results, carrying out Unit Commitment adjustment and the operation fuel of each subregion thermal power station prepares.
By the electric load allocation optimized of above step, can carry out rapidly fired power generating unit generation load on next day distributes, determine by stages interconnection 24h on next day Change Power curve, in the situation that with due regard to thermal power station's generating utilizes the constraint of hourage bound, reduce to greatest extent the generator operation energy consumption of entire system.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. the by stages interconnection Change Power optimization method based on limit generating energy consumption, comprises first electric load allocation optimized and the optimization of secondary power sharing of load, wherein,
Described first electric load allocation optimized comprises the following steps:
(1), subregion load prediction data are a few days ago prepared: by Short Term Load Forecasting System client, obtain respectively the daily load curve of prediction a few days ago that interconnection L to be optimized connects two subregion A, B, subregion A, B are respectively L at t load constantly
a(t), L
b(t);
(2), the preferential tagmeme sequence of unit load: obtain respectively two subregion A, B Zhong Ge fired power generating unit unit generating energy consumption, and sort according to the ascending preferential tagmeme of unit load that carries out respectively each subregion of unit generating energy consumption;
(3), thermal power station's start capacity is optimized: according to the preferential tagmeme of fired power generating unit load and two subregion thermoelectricitys on next day start capacity requirement, optimize respectively the start capacity of each subregion thermal power station, maximize electric power surplus in subregion;
(4), thermal power station service position is optimized: according to above each thermal power station's start capacity optimum results and the preferential tagmeme of fired power generating unit load, take in subregion and generate electricity energy consumption minimum as target, optimize respectively each service position of subregion thermal power station on subregion daily load curve; And,
The optimization of described secondary power sharing of load comprises the following steps:
(5), interconnection Change Power adjusts step-length setting: arrange and carry out the step delta P of interconnection Change Power while adjusting at every turn, and initialization period t=1;
(6), interconnection Change Power regularization condition judgement: generating energy consumption and the interconnection Transmission Capacity Constraints of fired power generating unit judge whether to meet t interconnection Change Power regularization condition constantly constantly according to two subregion t, if satisfied determine power transmission subregion S and be subject to electric subregion R, enter step (7), otherwise, t=t+1, enters step (8);
(7), interconnection Change Power is adjusted: by adjustment step delta P adjustment t, constantly send and be subject to electric subregion electric power, and revise t and constantly send and be subject to electric partition load, on revised load curve, by the preferential tagmeme of unit load, upgrade t and constantly send the service position of the residue start capacity part that is subject to electric subregion respectively to remain fired power generating unit on daily load curve;
(8), judge whether t is greater than 24, also the interconnection Change Power of all periods whether all adjusted is complete, if adjusted is complete, enter step (9), otherwise return to step (6);
(9), output by stages interconnection Change Power on next day optimum results, comprise by stages interconnection Change Power on next day curve and each fired power generating unit electric load distribution condition, and by this optimum results, carry out Unit Commitment adjustment and the preparation of operation fuel of each subregion thermal power station.
2. method according to claim 1, wherein, described step (3) comprising:
A) according to the capacity of must starting shooting about definite each thermal power station of operation constraint: the minimum start of An Ge thermal power station retrains determines minimum start capacity on each thermal power station's next day; Consider that each thermal power station year generating utilizes the constraint of hourage lower limit, determine each thermal power station capacity of must starting shooting next day; According to subregion security personnel start constraint, determine that each thermal power station supplements start capacity next day;
B) by the best start capacity of each thermal power station of fired power generating unit load precedence bit optimization: consider that the generating of thermal power station's year utilizes the constraint of the hourage upper limit, by the best on each thermal power station of the fired power generating unit load precedence bit optimization next day capacity of starting shooting; If now still cannot meet start capacity requirement, disregarding thermal power station's year generating and utilizing the constraint of the hourage upper limit, by the best on each thermal power station of the fired power generating unit load precedence bit optimization next day capacity of starting shooting.
3. method according to claim 1, wherein, in described step (6), one of meets the following conditions and to carry out t interconnection Change Power adjustment constantly:
A)C
Δ PA+(t) < C
Δ PB-(t) & P
l(t) < P
l.max+, determine that subregion A is power transmission subregion, with alphabetical S, represent, subregion B, for being subject to electric subregion, represents with letter r;
B)C
Δ PA-(t) > C
Δ PB+(t) & P
l(t) >-P
l.max-, determining that subregion A, for being subject to electric subregion, represents with letter r, subregion B is power transmission subregion, with alphabetical S, represents,
Wherein, C
Δ PA+(t), C
Δ PA-(t) be respectively subregion A and at t, constantly increase/reduce the generating energy consumption that size increases/reduces after exerting oneself for the fired power generating unit of Δ P, C
Δ PB+(t), C
Δ PB-(t) be respectively subregion B and at t, constantly increase/reduce the generating energy consumption that size increases/reduces after exerting oneself for the fired power generating unit of Δ P, P
l(t) be interconnection L at Change Power constantly of t (while being carried to subregion B by subregion A with electric power for just), P
l.max+, P
l.max-be respectively the forward of interconnection L, the reverse upper limit that transmits electric power.
4. method according to claim 1, wherein, in described step (7), t constantly send and is subject to electric partition load to adjust computing formula to be
T constantly interconnection Change Power adjustment computing formula is
Wherein, L
s(t), L
r(t) be respectively t constantly the power transmission subregion after last interconnection exchange of electric power, be subject to electric subregion modified load; L'
s(t), L'
r(t) be respectively t constantly the power transmission subregion after this interconnection exchange of electric power, be subject to electric subregion modified load; P
l(t), P '
l(t) be respectively the interconnection Change Power after t last time in the moment, this interconnection exchange of electric power.
5. method according to claim 1, wherein, described step delta P is preferably the greatest common divisor of each fired power generating unit residue start capacity.
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| CN110323787B (en) * | 2019-07-01 | 2021-09-24 | 南通大学 | Iterative optimization method for junctor exchange power |
| CN110416997B (en) * | 2019-07-01 | 2021-10-26 | 南通大学 | Tie line power step-by-step iterative optimization method based on unit combination result |
| CN110460109A (en) * | 2019-08-21 | 2019-11-15 | 清华大学 | Passway for transmitting electricity increases the analysis method and device of capacity newly between regional power grid |
| CN110460109B (en) * | 2019-08-21 | 2020-12-29 | 清华大学 | Analysis method and device for newly added capacity of power transmission channel between regional power grids |
| CN111934363A (en) * | 2020-07-29 | 2020-11-13 | 国网甘肃省电力公司电力科学研究院 | Multi-source coordination peak regulation method for constraint of space distribution and regulation capacity of various types of power supplies |
| CN111934363B (en) * | 2020-07-29 | 2022-09-09 | 国网甘肃省电力公司电力科学研究院 | Multi-source coordination peak regulation method for constraint of space distribution and regulation capacity of various types of power supplies |
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