CN111080468A - Method and system for adjusting out-of-limit medium-and-long-term electric quantity - Google Patents
Method and system for adjusting out-of-limit medium-and-long-term electric quantity Download PDFInfo
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Abstract
The invention provides a method and a system for adjusting medium and long term electric quantity out-of-limit, comprising the following steps: decomposing the total transaction electric quantity in the medium and long term transaction electric quantity based on the operation working condition and the operation period of the units to obtain the monthly transaction electric quantity of each unit; constructing a target function based on the minimum difference between the monthly transaction electric quantity of each unit and the correspondingly adjusted transaction electric quantity; solving the objective function by using an optimization algorithm to obtain the total transaction electric quantity of the adjusted unit; and generating power by taking the adjusted total transaction electric quantity of the unit as a power generation plan. The invention considers the operation condition of the machine set and different operation periods of the power grid, realizes monthly decomposition of the transaction electric quantity, constructs a planning model for electric quantity out-of-limit adjustment by taking the minimum adjustment quantity as a target function and the limit of the equipment electric quantity as a constraint condition, achieves the optimal adjustment effect, and can quickly solve because the model is a linear model to obtain the final result considering the electric quantity out-of-limit condition of all equipment.
Description
Technical Field
The invention relates to the field of power system scheduling, in particular to a method and a system for adjusting medium-and long-term electric quantity out-of-limit.
Background
With the advance of market-based innovation and the orderly release of power generation and utilization plans, the scale of market trading electric quantity is continuously enlarged, the proportion of market means for balancing electric quantity is steadily increased, the electric quantity of medium and long-term market trading gradually replaces annual planned electric quantity, the imbalance of the electric quantity in time-space dimension distribution is more and more obvious, the safety margin of a power grid is reduced due to the imbalance of the electric quantity and the uncertainty of trading results, and therefore, the electric quantity of medium and long-term trading is necessary to be checked, and the out-of-limit of the electric quantity is adjusted.
The medium-and-long-term electric quantity out-of-limit checking and adjusting mainly comprises annual and monthly checking of various transaction electric quantities and planned electric quantities so as to meet the requirements of safe and economic operation of a power grid. Because the uncertainty of prediction information related to medium-and long-term out-of-limit checking and adjusting of electric quantity is large, the time scale is long, the electric quantity decomposition is related, and a unified analysis model and a unified solving method are not available at present. The requirements of dispatching modes in various countries have obvious differences, the medium-term and long-term contracts are mainly financial contracts, deviation processing mechanisms are complete, research on medium-term and long-term electric quantity out-of-limit adjustment is relatively less, and research and application aiming at medium-term and long-term electric quantity out-of-limit analysis are just in a starting stage. At present, some research results provide that the electric quantity analysis is carried out on a key section through the accumulation relation of the electric quantity, but the fine analysis is difficult to be carried out on a trend level; some achievements focus on finding and checking out the out-of-limit electric quantity, and research on how to perform optimal adjustment after the out-of-limit is less.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a medium-and-long-term electric quantity out-of-limit adjusting method and system based on equipment electric quantity out-of-limit through full field research and according to actual requirements.
The technical scheme provided by the invention is as follows: a method for adjusting medium-long term electric quantity out-of-limit comprises the following steps:
decomposing the total transaction electric quantity in the medium and long term transaction electric quantity based on the operation working condition and the operation period of the units to obtain the monthly transaction electric quantity of each unit;
constructing a target function based on the minimum difference between the monthly transaction electric quantity of each unit and the correspondingly adjusted transaction electric quantity;
solving the objective function by using an optimization algorithm to obtain the total transaction electric quantity of the adjusted unit;
and generating power by taking the adjusted total transaction electric quantity of the unit as a power generation plan.
Preferably, the method for decomposing the total transaction electric quantity in the medium and long term transaction electric quantity based on the operation condition and the operation period of the unit to obtain the monthly transaction electric quantity of each unit comprises the following steps:
classifying trading months related to each unit in the medium and long term trading electric quantity to obtain an operating period;
carrying out monthly decomposition on the total transaction electric quantity of each unit in the medium and long term transaction electric quantity to obtain the total transaction electric quantity of each operation period;
distributing the total transaction electric quantity of each operation period according to the month corresponding to the operation period based on the operation condition of each unit to obtain the transaction electric quantity of each month;
wherein the run time period comprises: a heat supply period, a non-heat supply period, a water abundance period and a dry water period.
Preferably, the total transaction power amount in each operation period is calculated according to the following formula:
Ji,t＝ki,t·Ji
in the formula: j. the design is a squarei,t: the total transaction electric quantity of the unit i in the period t; k is a radical ofi,t: the electric quantity coefficient of the unit i in the t period; j. the design is a squarei: and (4) total transaction electric quantity of the unit i.
Preferably, the trading power amount per month is calculated according to the following formula:
in the formula: qi,m: the unit i trades the electric quantity in the mth month; ci,t,m: the operation days of the unit i in the mth month in the t period do not include the days of overhaul, standby and retirement in the current month; ci,t: the total operation days of the unit i in the t period; j. the design is a squarei,t: and (4) transaction total electric quantity of the unit i in the period t.
Preferably, the objective function is as follows:
in the formula: fmin: an objective function; t: the number of months; n: the number of units; qi,m: the unit i trades the electric quantity in the mth month; q'i,m: and adjusting the transaction electric quantity of the unit i in the m month.
Preferably, the method further comprises: constructing the following constraint conditions for the objective function:
the method comprises the following steps of unit electric quantity constraint, unit group electric quantity constraint, line electric quantity constraint and section electric quantity constraint.
Preferably, the unit power constraint is as follows:
in the formula: q'i,m: adjusting the transaction electric quantity of the unit i in the mth month;
the electric quantity limit of the unit i in the mth month; qi,m: and (4) the unit i trades the electricity quantity in the m month.
Preferably, the group power constraint is as follows:
in the formula: g's,m: the transaction electric quantity of the adjusted machine group s in the mth month;
is the electric quantity limit of the unit group in the mth month; m: the number of the units in the unit group; qi′,m: and adjusting the transaction electric quantity of the unit i in the m month.
Preferably, the line power constraint is as follows:
in the formula: l'k,m: adjusting the transaction electric quantity of the line k in the mth month;
the electric quantity limit of the mth month of the line k; h: the number of nodes in the power system; q'h,m: the transaction electric quantity of the node h in the mth month is obtained by accumulating the transaction electric quantities of all the units under the node hTo; lh,m: the load electric quantity of the node h in the mth month; skh: the line tide of the kth line has a distribution factor of the active output of the h node;
wherein, the line tide of the kth line has a distribution factor S of the active power of the h nodekhCalculated as follows:
Skh＝(Xph-Xqh)/xk
in the formula: xph: the impedance value of one end p of the line k in the DC power flow impedance matrix; xqh: the impedance value of the other end q of the line k in the direct current power flow impedance matrix; x is the number ofk: the impedance of line k.
Preferably, the cross-sectional electrical quantity constraint is as follows:
in the formula:
electric quantity quota of mth month of section f; d'f,m: adjusting the trading electric quantity of the section f in the mth month; k: the number of lines included in the section; l'k,m: and adjusting the transaction electric quantity of the line k in the m month.
Preferably, the total transaction electric quantity of the adjusted unit is calculated according to the following formula:
in the formula: j'i: adjusting the total transaction electric quantity of the set i; t: the number of months; q'i,m: and adjusting the transaction electric quantity of the unit i in the m month.
Based on the same invention concept, the invention provides a medium-and-long-term electric quantity out-of-limit adjusting system, which comprises:
the decomposition module is used for decomposing the total transaction electric quantity in the medium and long term transaction electric quantity based on the operation working condition and the operation period of the units to obtain the monthly transaction electric quantity of each unit;
the system comprises a construction target function module, a calculation target function module and a control target function module, wherein the construction target function module is used for constructing a target function based on the minimum difference between the monthly transaction electric quantity of each unit and the correspondingly adjusted transaction electric quantity;
the calculation module is used for solving the objective function by utilizing an optimization algorithm to obtain the total transaction electric quantity of the adjusted unit;
and the processing module is used for generating power by taking the adjusted total transaction electric quantity of the unit as a power generation plan.
Preferably, the decomposition module includes:
the operation period unit is used for classifying the transaction months related to each unit in the medium and long-term transaction electric quantity to obtain an operation period;
the decomposition unit is used for carrying out monthly decomposition on the total transaction electric quantity of each unit in the medium and long-term transaction electric quantity to obtain the transaction total electric quantity of each operation period;
the distribution unit is used for distributing the total transaction electric quantity of each operation period according to the month corresponding to the operation period based on the operation working condition of each unit to obtain the transaction electric quantity of each month;
wherein the run time period comprises: a heat supply period, a non-heat supply period, a water abundance period and a dry water period.
Compared with the prior art, the invention has the beneficial effects that:
according to the technical scheme provided by the invention, the total transaction electric quantity in the medium-and-long-term transaction electric quantity is decomposed based on the operation working condition and the operation period of the units to obtain the transaction electric quantity of each unit per month; constructing a target function based on the minimum difference between the monthly transaction electric quantity of each unit and the correspondingly adjusted transaction electric quantity; solving the objective function by using an optimization algorithm to obtain the total transaction electric quantity of the adjusted unit; the total transaction electric quantity of the set after adjustment is used as a power generation plan to generate power, an optimal adjustment method after out-of-limit is provided, and accuracy of predicting medium and long-term electric quantity is improved.
According to the technical scheme provided by the invention, monthly decomposition of the transaction electric quantity is realized according to the operation working condition of the unit and different operation periods of the power grid, the minimum adjustment quantity of the out-of-limit electric quantity is taken as a target function, the limit quantity of the equipment electric quantity is taken as a constraint condition, a planning model for the out-of-limit adjustment of the electric quantity is constructed, the optimal adjustment effect is achieved, and as the model is a linear model, the method can quickly solve and obtain the final result considering the out-of-limit condition of all the equipment electric quantity.
According to the technical scheme provided by the invention, the operation working conditions of unit maintenance, machine set shutdown and the like are considered, different operation periods of a power grid such as a heat supply period, a non-heat supply period, a water-rich period, a dry period and the like are considered, two aspects are integrated to carry out monthly decomposition on the transaction electric quantity, and a reliable and practical data basis is provided for electric quantity out-of-limit adjustment.
According to the technical scheme provided by the invention, the minimum adjustment quantity is taken as a target function, the electric quantity limit of the equipment is not exceeded is taken as a constraint condition, a mathematical programming model for electric quantity out-of-limit adjustment is constructed, the out-of-limit adjustment of all types of equipment is completed at one time, and the quick and optimal adjustment effect is achieved.
Drawings
FIG. 1 is a flow chart of a method for adjusting the out-of-limit of the medium-and-long-term electric quantity according to the present invention;
fig. 2 is a schematic diagram illustrating specific steps of an adjusting method according to an embodiment of the present invention.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
In recent years, the electric power market is rapidly promoted, various electric quantity trades are more and more, and the requirement for rigid execution of medium and long term electric quantity is higher and higher, but effective and comprehensive checking and adjusting means for the medium and long term trading electric quantity is lacked all the time because the medium and long term trading electric quantity spans a long time, the uncertainty of a power grid boundary is strong, and the requirement for rigid execution is low. Therefore, in order to ensure the safety of the power grid and the performance of the power, an effective and feasible power checking and adjusting method needs to be provided.
Example 1:
fig. 1 is a flowchart of a method for adjusting the medium-and long-term power out-of-limit in the present embodiment, as shown in fig. 1, including:
step S1, decomposing the total transaction electric quantity in the medium and long term transaction electric quantity based on the operation condition and the operation period of the units to obtain the monthly transaction electric quantity of each unit;
step S2, constructing a target function based on the minimum difference between the monthly transaction electric quantity of each unit and the correspondingly adjusted transaction electric quantity;
step S3, solving the objective function by using an optimization algorithm to obtain the total transaction electric quantity of the adjusted unit;
and step S4, generating power by taking the total transaction electric quantity of the adjusted unit as a power generation plan.
Specifically, as shown in fig. 2, the present embodiment provides specific steps of the adjustment method, as follows:
step S1, decomposing the total transaction electric quantity in the medium and long term transaction electric quantity based on the operation condition and the operation period of the units to obtain the monthly transaction electric quantity of each unit, which specifically comprises the following steps:
1. obtaining various types of basic data, including: the method comprises the following steps of power grid model parameters, electric quantity quota information of equipment (a unit, a unit group, a line and a section), unit transaction information in medium and long term transaction electric quantity, load prediction, unit overhaul and other data.
2. A network distribution factor is calculated.
Calculating according to the power grid model:
Skh＝(Xph-Xqh)/xk(1)
in the formula: skh: the line tide of the kth line has a distribution factor of the active output of the h node; xph: the impedance value of one end p of the line k in the DC power flow impedance matrix; xqh: the impedance value of the other end q of the line k in the direct current power flow impedance matrix; x is the number ofk: the impedance of line k.
3. And carrying out monthly decomposition on the unit transaction electric quantity.
Firstly, carrying out classification analysis on the trading months related to the unit to obtain different operation periods, namely: the thermal power generating unit considers a heat supply period and a non-heat supply period, and the hydroelectric generating unit considers a water abundance period and a dry water period to obtain the total transaction electric quantity in different operation periods:
Ji,t＝ki,t·Ji(2)
in the formula, JiIs the total transaction power, k, of the unit ii,tIs the electric quantity coefficient of the unit i in the t period (heat supply period, non-heat supply period, rich water period and dry water period) and can be obtained by historical statistics, Ji,tIs the total transaction electric quantity of the unit i in the period t.
Then, distributing according to the operating condition of the unit and the following formula to obtain monthly trading electric quantity:
in the formula, Ci,t,mThe number of operation days of the unit i in the mth month in the period t is obtained by subtracting the number of overhaul, shutdown and retirement days from the total number of days of the current month Ci,tThe total operation days of the unit i in the period t comprise the days of overhaul, standby and retirement in the current month; qi,mThe unit i is the transaction electric quantity in the m month.
4. And setting a constraint condition.
In the process of adjusting the out-of-limit electric quantity, the following constraint conditions are satisfied:
(1) and (3) unit electric quantity constraint:
in the formula (I), the compound is shown in the specification,
is the electric quantity limit of the unit i m month, Q'i,mThe transaction electric quantity of the set i in the m month after adjustment.
(2) And (3) power constraint of the machine group:
in the formula: g's,m: the transaction electric quantity of the adjusted machine group s in the mth month;
is the electric quantity limit of the unit group in the mth month; m: the number of the units in the unit group; q'i,m: and adjusting the transaction electric quantity of the unit i in the m month.
(3) And (3) line electric quantity constraint:
in the formula: l'k,m: adjusting the transaction electric quantity of the line k in the mth month;
the electric quantity limit of the mth month of the line k; h: the number of nodes in the power system; q'h,m: the transaction electric quantity of the node h in the mth month is obtained by accumulating the transaction electric quantities of all the units under the node h; lh,m: the load electric quantity of the node h in the mth month; skh: the line tide of the kth line has a distribution factor of the active output of the h node;
(4) cross section electric quantity restraint
In the formula:
electric quantity quota of mth month of section f; d'f,m: adjusting the trading electric quantity of the section f in the mth month; k: the number of lines included in the section; l'k,m: and adjusting the transaction electric quantity of the line k in the m month.
Step S2, constructing an objective function based on the minimum difference between the monthly transaction electric quantity of each unit and the correspondingly adjusted transaction electric quantity, specifically including:
5. the method comprises the following steps of determining a target function by taking the minimum accumulated adjustment quantity of unit transaction electric quantity as a target, wherein the target function is shown as the following formula:
in the formula: fmin: an objective function; t: the number of months refers to the trading months related to the unit; n: the number of units; qi,m: the unit i trades the electric quantity in the mth month; q'i,m: and adjusting the transaction electric quantity of the unit i in the m month.
Step S3, solving the objective function by using an optimization algorithm to obtain the total transaction electric quantity of the adjusted unit, specifically including:
6. model solution
And solving the planning model by the conventional linear optimization calculation method to obtain the adjusted transaction electric quantity. Accumulating the adjusted electric quantity of each month to obtain the total transaction electric quantity of the adjusted unit, namely:
of formula (II) to (III)'iThe total transaction electric quantity of the set i after adjustment.
And step S4, generating power by taking the total transaction electric quantity of the adjusted unit as a power generation plan.
Example 2:
in this embodiment, a part of the units in table 1 is taken as an example, and the out-of-limit electric quantity of the unit is adjusted by the adjusting method provided in this embodiment.
Input data
(1) Transaction information of unit (planning unit)
Carrying out monthly decomposition on the total transaction electric quantity of each unit to obtain monthly transaction information of the units, wherein the monthly transaction information is shown in a table 1:
TABLE 1 transaction information (MWH) of partial units (planning units)
(2) Limit for electric quantity of equipment
TABLE 2 monthly electricity quota (MWH) for part of the equipment
Note: negative values in the table indicate only the direction of the current
Second, device out-of-limit condition
The transaction information is distributed to the corresponding devices to obtain the out-of-limit condition of part of the devices, as shown in table 3:
TABLE 3 partial device out-of-limit conditions
It can be seen from the table that the Tengda unit, the nine-stone double-circuit unit group and the custom section are out of limit in the month before adjustment, and the out-of-limit electric quantity of the Tengda unit, the nine-stone double-circuit unit group and the custom section needs to be adjusted.
Third, out-of-limit adjustment
The out-of-limit adjustment is carried out on the out-of-limit equipment by taking the minimum accumulated adjustment amount of the unit transaction electric quantity as a target, and the adjusted equipment electric quantity is shown in a table 4:
table 4 electric quantity before and after adjusting part of equipment (MWH)
Adjusting the back extension set transaction power is shown in table 5:
table 5 final transaction electric quantity of partial unit
Example 3:
based on the same invention concept, the invention also provides a medium-and long-term electric quantity out-of-limit adjusting system, which comprises:
the decomposition module is used for decomposing the total transaction electric quantity in the medium and long term transaction electric quantity based on the operation working condition and the operation period of the units to obtain the monthly transaction electric quantity of each unit;
the system comprises a construction target function module, a calculation target function module and a control target function module, wherein the construction target function module is used for constructing a target function based on the minimum difference between the monthly transaction electric quantity of each unit and the correspondingly adjusted transaction electric quantity;
the calculation module is used for solving the objective function by utilizing an optimization algorithm to obtain the total transaction electric quantity of the adjusted unit;
and the processing module is used for generating power by taking the adjusted total transaction electric quantity of the unit as a power generation plan.
In an embodiment, the decomposition module includes:
the operation period unit is used for classifying the transaction months related to each unit in the medium and long-term transaction electric quantity to obtain an operation period;
the decomposition unit is used for carrying out monthly decomposition on the total transaction electric quantity of each unit in the medium and long-term transaction electric quantity to obtain the transaction total electric quantity of each operation period;
the distribution unit is used for distributing the total transaction electric quantity of each operation period according to the month corresponding to the operation period based on the operation working condition of each unit to obtain the transaction electric quantity of each month;
wherein the run time period comprises: a heat supply period, a non-heat supply period, a water abundance period and a dry water period.
In an embodiment, the adjustment system further includes: constructing the following constraint conditions for the objective function:
the method comprises the following steps of unit electric quantity constraint, unit group electric quantity constraint, line electric quantity constraint and section electric quantity constraint.
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 present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (13)
1. A method for adjusting the out-of-limit of medium and long term electric quantity is characterized by comprising the following steps:
decomposing the total transaction electric quantity in the medium and long term transaction electric quantity based on the operation working condition and the operation period of the units to obtain the monthly transaction electric quantity of each unit;
constructing a target function based on the minimum difference between the monthly transaction electric quantity of each unit and the correspondingly adjusted transaction electric quantity;
solving the objective function by using an optimization algorithm to obtain the total transaction electric quantity of the adjusted unit;
and generating power by taking the adjusted total transaction electric quantity of the unit as a power generation plan.
2. The method of claim 1, wherein decomposing the total trading power in the medium and long term trading power based on the operating conditions and operating periods of the units to obtain the trading power per month of each unit comprises:
classifying trading months related to each unit in the medium and long term trading electric quantity to obtain an operating period;
carrying out monthly decomposition on the total transaction electric quantity of each unit in the medium and long term transaction electric quantity to obtain the total transaction electric quantity of each operation period;
distributing the total transaction electric quantity of each operation period according to the month corresponding to the operation period based on the operation condition of each unit to obtain the transaction electric quantity of each month;
wherein the run time period comprises: a heat supply period, a non-heat supply period, a water abundance period and a dry water period.
3. The method of claim 2, wherein the total amount of power traded for each run period is calculated as follows:
Ji,t＝ki,t·Ji
in the formula: j. the design is a squarei,t: the total transaction electric quantity of the unit i in the period t; k is a radical ofi,t: the electric quantity coefficient of the unit i in the t period; j. the design is a squarei: and (4) total transaction electric quantity of the unit i.
4. The method of claim 2, wherein the monthly transaction power is calculated as:
in the formula: qi,m: the unit i trades the electric quantity in the mth month; ci,t,m: the operation days of the unit i in the mth month in the t period do not include the days of overhaul, standby and retirement in the current month; ci,t: the total operation days of the unit i in the t period; j. the design is a squarei,t: and (4) transaction total electric quantity of the unit i in the period t.
5. The method of claim 1, wherein the objective function is expressed by the following equation:
in the formula: fmin: an objective function; t: the number of months; n: the number of units; qi,m: the unit i trades the electric quantity in the mth month; q'i,m: and adjusting the transaction electric quantity of the unit i in the m month.
6. The method of claim 5, further comprising: constructing the following constraint conditions for the objective function:
the method comprises the following steps of unit electric quantity constraint, unit group electric quantity constraint, line electric quantity constraint and section electric quantity constraint.
7. The method of claim 6, wherein the unit electrical constraints are as follows:
in the formula: q'i,m: adjusting the transaction electric quantity of the unit i in the mth month;
the electric quantity limit of the unit i in the mth month; qi,m: and (4) the unit i trades the electricity quantity in the m month.
8. The method of claim 6, wherein the group battery constraints are as follows:
in the formula: g's,m: the transaction electric quantity of the adjusted machine group s in the mth month;
is the electric quantity limit of the unit group in the mth month; m: the number of the units in the unit group; q'i,m: and adjusting the transaction electric quantity of the unit i in the m month.
9. The method of claim 6, wherein the line power constraint is expressed by:
in the formula: l'k,m: adjusting the transaction electric quantity of the line k in the mth month;
the electric quantity limit of the mth month of the line k; h: the number of nodes in the power system; q'h,m: the transaction electric quantity of the node h in the mth month is obtained by accumulating the transaction electric quantities of all the units under the node h; lh,m: the load electric quantity of the node h in the mth month; skh: the line tide of the kth line has a distribution factor of the active output of the h node;
wherein, the line tide of the kth line has a distribution factor S of the active power of the h nodekhCalculated as follows:
Skh＝(Xph-Xqh)/xk
in the formula: xph: the impedance value of one end p of the line k in the DC power flow impedance matrix; xqh: the impedance value of the other end q of the line k in the direct current power flow impedance matrix; x is the number ofk: the impedance of line k.
10. The method of claim 6, wherein the cross-sectional electrical quantity constraint is expressed by:
in the formula:
electric quantity quota of mth month of section f; d'f,m: adjusting the trading electric quantity of the section f in the mth month; k: the number of lines included in the section; l'k,m: and adjusting the transaction electric quantity of the line k in the m month.
11. The method of claim 1, wherein the total transaction power of the adjusted unit is calculated according to the following formula:
in the formula: j'i: adjusting the total transaction electric quantity of the set i; t: the number of months; q'i,m: and adjusting the transaction electric quantity of the unit i in the m month.
12. A medium-long term electric quantity out-of-limit adjusting system is characterized by comprising:
the decomposition module is used for decomposing the total transaction electric quantity in the medium and long term transaction electric quantity based on the operation working condition and the operation period of the units to obtain the monthly transaction electric quantity of each unit;
the system comprises a construction target function module, a calculation target function module and a control target function module, wherein the construction target function module is used for constructing a target function based on the minimum difference between the monthly transaction electric quantity of each unit and the correspondingly adjusted transaction electric quantity;
the calculation module is used for solving the objective function by utilizing an optimization algorithm to obtain the total transaction electric quantity of the adjusted unit;
and the processing module is used for generating power by taking the adjusted total transaction electric quantity of the unit as a power generation plan.
13. The system of claim 12, wherein the decomposition module comprises:
the operation period unit is used for classifying the transaction months related to each unit in the medium and long-term transaction electric quantity to obtain an operation period;
the decomposition unit is used for carrying out monthly decomposition on the total transaction electric quantity of each unit in the medium and long-term transaction electric quantity to obtain the transaction total electric quantity of each operation period;
the distribution unit is used for distributing the total transaction electric quantity of each operation period according to the month corresponding to the operation period based on the operation working condition of each unit to obtain the transaction electric quantity of each month;
wherein the run time period comprises: a heat supply period, a non-heat supply period, a water abundance period and a dry water period.
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