CN109193688B - Method and device for setting daily action times of discrete reactive equipment of single transformer substation - Google Patents
Method and device for setting daily action times of discrete reactive equipment of single transformer substation Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a method and a device for setting daily action times of discrete reactive equipment of a single substation, wherein the method requires the minimum deviation of the discrete reactive equipment and reactive demand quantity of a power grid in an objective function, the deviation is subjected to weighting treatment through the time length of the time interval in a self-adaptive manner, the other part of the objective function consists of a limit value with the minimum action times, so that the control cost is reduced, in constraint, the reactive output of the discrete reactive equipment within the total output action time limit value of the discrete reactive equipment can meet the reactive demand of a system, and the action times of the discrete reactive equipment of the single substation in different time intervals can be obtained by solving an integer programming model. The method has the advantages of simple principle, convenient solution and strong engineering practicability.
Description
Technical Field
The invention relates to a method and a device for setting daily work times of discrete reactive power equipment of a single transformer substation, which are suitable for an electric power regulation and control system and belong to the technical field of operation and control of electric power systems.
Background
The voltage reactive regulation and control becomes mature through years of research, and the voltage reactive regulation and control method is widely applied to actual power grid control and achieves a good effect. However, with the continuous expansion of the power grid scale and the gradual and complicated load change, the phenomenon that the optimal operation effect is not ideal due to the unreasonable parameter setting often occurs in the reactive regulation of the voltage of a single substation, and the reason is mainly that the operator is difficult to accurately grasp the reasonable parameter setting, and particularly, the determination of the action times of reactive compensation equipment such as discrete reactive power sources such as capacitors is the most difficult.
The existing method is mostly based on manual experience setting, can not catch the main contradiction of load change, is rough in setting and has no pertinence to the load, and therefore, in most cases, controllable discrete reactive power sources such as capacitors do not exist.
Through retrieval, no patent of an integer programming model for setting the equipment action times in the voltage reactive power regulation and control of the single transformer substation exists in China.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a device for setting daily action times of discrete reactive equipment of a single substation, which can obtain the action times of the discrete reactive equipment of the single substation in different time periods.
In order to solve the technical problem, the invention provides a method for setting the daily action times of discrete reactive power equipment of a single transformer station, which specifically comprises the following steps:
s1, determining the active power of the starting point and the active power of the ending point in each time interval according to the day and time interval division result of the transformer substation;
s2, determining reactive power requirements in each time period according to the active power of the starting point and the active power of the ending point in each time period;
s3, calculating the capacity of the discrete reactive equipment corresponding to each time interval;
s4, establishing an objective function with the minimum deviation between the capacity of the discrete reactive equipment and the reactive demand and the minimum action times of the equipment in all time periods as targets;
and S5, solving the objective function to obtain the action times of each time interval, and obtaining the total action times of each day.
Preferably, the number of discrete reactive device actions corresponding to any time period is an integer variable.
Preferably, in S2, the reactive power requirement in the i-th period
Wherein, i is 1, 2. N is the daily time division number of the transformer station, alpha is the regulation coefficient, pstart_iIs the active power at the starting point in the ith period, pend_iIs the active power at the end point in the ith period.
Preferably, the value range of the adjusting coefficient alpha is 1< alpha < 1.5.
Preferably, in S4, the expression of the objective function is:
s.t ki*Qi>Qi0+γ
wherein, TiIs the i-th period start time, Ti+1Is the i-th period end time, QiCapacity of discrete reactive devices, Q, for period ii0Reactive demand, k, in the i-th time periodiThe number of actions to be allocated for the ith period, (T)i+1-Ti)2*(ki*Qi-Qi0)2The object of the item is Ti～Ti+1The deviation of the capacity of the discrete reactive equipment and the reactive demand of the power grid within a time period is minimal, ki 2The term indicates that the number of actions of the device is the minimum, λ is a weight control coefficient, λ>0, γ is a margin control coefficient, γ>0；
Constraint ki*Qi>Qi0+ gamma for ensuring discrete reactive equipment in each time segmentThe reactive power output within the total output action frequency limit value can meet the reactive power requirement of the system.
Correspondingly, the invention also provides a device for setting the daily action times of the discrete reactive equipment of the single-transformer substation according to the method, which comprises the following steps:
the time interval parameter determining module is used for determining the active power of a starting point and the active power of an ending point in each time interval according to the day and time interval division result of the transformer substation;
the reactive power demand calculation module is used for determining reactive power demand in each time period according to the active power of the starting point and the active power of the ending point in each time period;
the reactive equipment capacity calculation module is used for calculating the capacity of discrete reactive equipment corresponding to each time interval;
the objective function establishing module is used for establishing an objective function which aims at minimizing the deviation between the capacity of the discrete reactive equipment and the reactive requirement in all time periods and minimizing the action times of the equipment;
and the action frequency calculation module is used for solving the objective function to obtain the action frequency of each time interval and obtain the daily total action frequency.
Preferably, in the reactive demand calculation module, the reactive demand in the ith time period
Wherein, i is 1, 2. N is the daily time division number of the transformer station, alpha is the regulation coefficient, pstart_iIs the active power at the starting point in the ith period, pend_iIs the active power at the end point in the ith period.
Preferably, the value range of the adjusting coefficient alpha is 1< alpha < 1.5.
Preferably, in the objective function establishing module, the objective function expression is as follows:
s.t ki*Qi>Qi0+γ
wherein, TiIs the i-th period start time, Ti+1Is the i-th period end time, QiCapacity of discrete reactive devices, Q, for period ii0Reactive demand, k, in the i-th time periodiThe number of actions to be allocated for the ith period, (T)i+1-Ti)2*(ki*Qi-Qi0)2The object of the item is Ti～Ti+1The deviation of the capacity of the discrete reactive equipment and the reactive demand of the power grid within a time period is minimal, ki 2The term indicates that the number of actions of the device is the minimum, λ is a weight control coefficient, λ>0, γ is a margin control coefficient, γ>0；
Constraint ki*Qi>Qi0+ gamma is to ensure that the reactive power output of the discrete reactive power equipment can meet the reactive power requirement of the system within the limit value of the total output action times of the discrete reactive power equipment in each time segment.
Accordingly, the present invention also provides a computer readable storage medium storing one or more programs, wherein the one or more programs comprise instructions, which when executed by a computing device, cause the computing device to perform the above-described method.
Compared with the prior art, the invention has the following beneficial effects: the method requires the minimum deviation of the reactive demand of the discrete reactive equipment and the power grid in the objective function, the deviation is subjected to weighting processing in a self-adaptive mode through the time length of the time interval, the other part of the objective function consists of the limit value with the minimum action times, so that the control cost is reduced, in the constraint, the reactive output of the discrete reactive equipment in the total limit value of the action times capable of outputting the power of the discrete reactive equipment can meet the reactive demand of the system in each time interval, and the action times of the discrete reactive equipment of a single station in different time intervals can be obtained by solving the integer programming model.
Detailed Description
The present invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The discrete reactive power source of the capacitor/reactor is used as widely-used reactive compensation equipment, and plays an important role in supporting voltage reactive power of the whole network and ensuring safety and economy. However, due to insulation and the like, the number of daily movements is subject to strict limits, which have been refined even to different periods of the day. However, how to determine the action times in each time interval is not researched at present, the engineering site is set and adjusted according to experience, the method is separated from the actual load change, the reactive power requirements of the power grid of the peak and the valley can be guaranteed only to a small extent, and the reactive power regulation and control effect of the voltage of a single transformer substation is further seriously influenced.
The method grasps the main contradiction of discrete reactive power sources such as a capacitor/a reactor and the like in meeting the requirement of voltage reactive power control of the single transformer station, intelligently reflects the control target of each stage through integer programming, and simultaneously reflects the load trends of different time periods in a self-adaptive manner through time weighting, thereby obtaining the action times of each time period.
The integer planning method for setting the daily action times of the discrete reactive equipment of the single transformer station comprises the following steps of setting N time interval division points of a certain transformer station, wherein the discrete reactive equipment corresponding to any time interval is an integer variable, the number of the integer variables corresponding to the discrete reactive equipment is N, and calculating the daily total action times specifically comprises the following steps:
step S1, calculating the capacity Q of the discrete reactive equipment corresponding to the ith time periodi；i＝1,2,......N；
Step S2, according to the time interval division result, determining the active power p of the starting point in the ith time intervalstart_iAnd active power p at the end pointend_iAnd an end time T of the periodi+1And a starting time Ti；
Step S3, determining reactive power demand in the ith time period
Alpha is an adjusting coefficient and generally takes a value range of 1<α<1.5。
Step S4, the following objective function is established:
s.t ki*Qi>Qi0+γ
here (T)i+1-Ti)2*(ki*Qi-Qi0)2The object of the item is Ti～Ti+1The deviation of the discrete reactive equipment from the reactive demand of the power grid in the time period is minimum, and the deviation of the form has two layers:
(1)(Ti+1-Ti)2the longer the represented reactive change trend is, the more action times are needed by discrete reactive power sources such as a capacitor and the like;
(2)(ki*Qi-Qi0)2it is shown that the faster the reactive power changes per unit time, the more number of operations are required by discrete reactive power sources such as capacitors.
Wherein k isiNumber of actions, k, to be allocated for the i-th periodi 2The term indicates that the number of actions of the device is guaranteed to be minimum, lambda>0 is a weight control coefficient, γ>0 is a margin control coefficient. The specific values of the two coefficients can be set according to experience, when the action times are considered to be more important, the weight control coefficient can be set to be larger, and when the guarantee margin is considered to be more important, the margin control coefficient can be set to be larger.
Constraint ki*Qi>Qi0The + gamma term is used for ensuring that the reactive power output of the discrete reactive power equipment within the limit value of the total output action times of the discrete reactive power equipment can meet the reactive power requirement of the system in each time segment.
Step S5, solving the integer programming problem to obtain the action times k of the ith time periodi(ii) a Obtain the total number of actions per day as
The method requires the minimum deviation of the reactive demand of the discrete reactive equipment and the power grid in the objective function, the deviation is subjected to weighting processing in a self-adaptive mode through the time length of the time interval, the other part of the objective function consists of the limit value with the minimum action times, so that the control cost is reduced, in the constraint, the reactive output of the discrete reactive equipment in the total limit value of the action times capable of outputting the power of the discrete reactive equipment can meet the reactive demand of the system in each time interval, and the action times of the discrete reactive equipment of a single station in different time intervals can be obtained by solving the integer programming model.
Correspondingly, the invention also provides a device for setting the daily action times of the discrete reactive equipment of the single-transformer substation according to the method, which comprises the following steps:
the time interval parameter determining module is used for determining the active power of a starting point and the active power of an ending point in each time interval according to the day and time interval division result of the transformer substation;
the reactive power demand calculation module is used for determining reactive power demand in each time period according to the active power of the starting point and the active power of the ending point in each time period;
the reactive equipment capacity calculation module is used for calculating the capacity of discrete reactive equipment corresponding to each time interval;
the objective function establishing module is used for establishing an objective function which aims at minimizing the deviation between the capacity of the discrete reactive equipment and the reactive requirement in all time periods and minimizing the action times of the equipment;
and the action frequency calculation module is used for solving the objective function to obtain the action frequency of each time interval and obtain the daily total action frequency.
Preferably, in the reactive demand calculation module, the reactive demand in the ith time period
Wherein, i is 1, 2. N is the daily time division number of the transformer station, alpha is the regulation coefficient, pstart_iIs the active power of the starting point in the ith period，pend_iIs the active power at the end point in the ith period.
Preferably, the value range of the adjusting coefficient alpha is 1< alpha < 1.5.
Preferably, in the objective function establishing module, the objective function expression is as follows:
s.t ki*Qi>Qi0+γ
wherein, TiIs the i-th period start time, Ti+1Is the i-th period end time, QiCapacity of discrete reactive devices, Q, for period ii0Reactive demand, k, in the i-th time periodiThe number of actions to be allocated for the ith period, (T)i+1-Ti)2*(ki*Qi-Qi0)2The object of the item is Ti～Ti+1The deviation of the capacity of the discrete reactive equipment and the reactive demand of the power grid within a time period is minimal, ki 2The term indicates that the number of actions of the device is the minimum, λ is a weight control coefficient, λ>0, γ is a margin control coefficient, γ>0；
Constraint ki*Qi>Qi0+ gamma is to ensure that the reactive power output of the discrete reactive power equipment can meet the reactive power requirement of the system within the limit value of the total output action times of the discrete reactive power equipment in each time segment.
Accordingly, the present invention also provides a computer readable storage medium storing one or more programs, wherein the one or more programs comprise instructions, which when executed by a computing device, cause the computing device to perform the above-described method.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. The method for setting the daily action times of the discrete reactive power equipment of the single transformer substation is characterized by comprising the following steps of:
s1, determining the active power of the starting point and the active power of the ending point in each time interval according to the day and time interval division result of the transformer substation;
s2, determining reactive power requirements in each time period according to the active power of the starting point and the active power of the ending point in each time period;
s3, calculating the capacity of the discrete reactive equipment corresponding to each time interval;
s4, establishing an objective function with the minimum deviation between the capacity of the discrete reactive equipment and the reactive demand and the minimum action times of the equipment in all time periods as targets;
s5, solving the objective function to obtain the action times of each time interval, and obtaining the total action times of each day;
in S2, reactive power demand in the ith time period
Wherein, i is 1, 2. N is the daily time division quantity of the transformer substation, alpha is an adjustment coefficient, and the value range is more than 1 and less than 1.5; p is a radical ofstart_iIs the active power at the starting point in the ith period, pend_iThe active power of an end point in the ith time period;
in S4, the objective function expression is:
s.t ki*Qi＞Qi0+γ
wherein, TiIs the i-th period start time, Ti+1Is the i-th period end time, QiCapacity of discrete reactive devices, Q, for period ii0For the reactive demand in the i-th period, kiThe number of actions to be allocated for the ith period, (T)i+1-Ti)2*(ki*Qi-Qi0)2The object of the item is Ti～Ti+1The deviation of the capacity of the discrete reactive equipment and the reactive demand of the power grid within a time period is minimal, ki 2The term represents that the action times of the equipment are minimum, lambda is a weight control coefficient, lambda is more than 0, gamma is a margin control coefficient, and gamma is more than 0;
constraint ki*Qi＞Qi0+ gamma is to ensure that the reactive power output of the discrete reactive power equipment can meet the reactive power requirement of the system within the limit value of the total output action times of the discrete reactive power equipment in each time segment.
2. The method for setting the daily action times of the discrete reactive power equipment of the single substation as claimed in claim 1, wherein the action times of the discrete reactive power equipment corresponding to any time period is an integer variable.
3. Single discrete reactive equipment daily action number of times of transformer substation sets up device, characterized by includes:
the time interval parameter determining module is used for determining the active power of a starting point and the active power of an ending point in each time interval according to the day and time interval division result of the transformer substation;
the reactive power demand calculation module is used for determining reactive power demand in each time period according to the active power of the starting point and the active power of the ending point in each time period;
the reactive equipment capacity calculation module is used for calculating the capacity of discrete reactive equipment corresponding to each time interval;
the objective function establishing module is used for establishing an objective function which aims at minimizing the deviation between the capacity of the discrete reactive equipment and the reactive requirement in all time periods and minimizing the action times of the equipment;
the action frequency calculation module is used for solving the objective function to obtain the action frequency of each time interval and obtain the total action frequency of each day;
in the reactive demand calculation module, the reactive demand in the ith time period
Wherein, i is 1, 2. N is the daily time division quantity of the transformer substation, alpha is an adjustment coefficient, and the value range is more than 1 and less than 1.5; p is a radical ofstart_iIs the active power at the starting point in the ith period, pend_iThe active power of an end point in the ith time period;
in the target function establishing module, the target function expression is as follows:
s.t ki*Qi＞Qi0+γ
wherein, TiIs the i-th period start time, Ti+1Is the i-th period end time, QiCapacity of discrete reactive devices, Q, for period ii0For the reactive demand in the i-th period, kiThe number of actions to be allocated for the ith period, (T)i+1-Ti)2*(ki*Qi-Qi0)2The object of the item is Ti～Ti+1The deviation of the capacity of the discrete reactive equipment and the reactive demand of the power grid within a time period is minimal, ki 2The term represents that the action times of the equipment are minimum, lambda is a weight control coefficient, lambda is more than 0, gamma is a margin control coefficient, and gamma is more than 0;
constraint ki*Qi＞Qi0+ gamma is to ensure that the reactive power output of the discrete reactive power equipment can meet the reactive power requirement of the system within the limit value of the total output action times of the discrete reactive power equipment in each time segment.
4. A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform the method of any of claims 1-2.
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