CN113469410B - Online calculation method and device for maximum power consumption capacity of power grid in consideration of uncertainty of new energy - Google Patents

Online calculation method and device for maximum power consumption capacity of power grid in consideration of uncertainty of new energy Download PDF

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CN113469410B
CN113469410B CN202110576250.XA CN202110576250A CN113469410B CN 113469410 B CN113469410 B CN 113469410B CN 202110576250 A CN202110576250 A CN 202110576250A CN 113469410 B CN113469410 B CN 113469410B
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CN113469410A (en
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徐泰山
刘韶峰
范越
陈堂龙
王茂春
汪马翔
董凌
常喜强
常康
张昊天
李吉晨
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State Grid Corp of China SGCC
NARI Group Corp
Nari Technology Co Ltd
State Grid Qinghai Electric Power Co Ltd
State Grid Xinjiang Electric Power Co Ltd
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State Grid Corp of China SGCC
NARI Group Corp
Nari Technology Co Ltd
State Grid Qinghai Electric Power Co Ltd
State Grid Xinjiang Electric Power Co Ltd
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Abstract

The application discloses an online calculation method and device for the maximum capacity of power grid in consideration of uncertainty of new energy, wherein the method takes the sum of active instructions of a new energy station as the maximum optimization target, takes the active predicted value of the new energy as the upper instruction limit, considers the safe and reliable operation constraint of the power grid, and determines the active instructions of active equipment of the power grid; according to the safety constraint boundary distance of the power grid, the available installed capacity of the new energy station and the active sensitivity of the new energy station to the power transmission channel/external connecting line, determining a new energy station set with an up-adjustable instruction upper limit and a new instruction upper limit of each station; determining a new instruction of the new energy station by taking the sum of active instructions of the new energy stations in the set as an optimization target to the maximum; and iterating until no new energy station with the upper limit of the instruction can be adjusted. The method can fully utilize the power transmission capacity of the external tie line and the negative hot standby replacement space of the power grid, reduce the influence of uncertainty of new energy prediction, and realize the calculation of the maximum capacity of new energy consumption on the premise of safe and reliable operation of the power grid.

Description

Online calculation method and device for maximum power consumption capacity of power grid in consideration of uncertainty of new energy
Technical Field
The application relates to an online computing method and device for maximum capacity of a power grid considering uncertainty of new energy, and belongs to the technical field of power grid dispatching operation and control.
Background
With the continuous increase of the new energy power generation ratio, the problem of new energy consumption is also highlighted, and the new energy power generation ratio becomes one of key influencing factors for restricting the continuous healthy development of the new energy power generation industry. The existing power grid real-time automatic power generation control performs online scheduling according to the active output prediction performance of the new energy power station and the real-time adjustment performance of the new energy power station and the conventional unit, and considers the influence degree of the active output of the new energy power station and the conventional unit on the online safety and stability characteristics of the power grid. However, due to the uncertainty of new energy power generation, a certain error exists in the new energy power generation capacity predicted value. If the predicted value is directly taken as the command upper limit, when the new energy command value is the predicted value and the predicted value of the new energy power station is larger than the actual power generation capacity, the new energy power station cannot actually send the specified value, so that the power transmission capacity of the power transmission channel of the power grid cannot be fully utilized; when the new energy command value is a predicted value and the new energy power station predicted value is smaller than the actual power generation capacity, the power transmission capacity of the external tie line of the power grid and the negative hot standby replacement space of the power grid cannot be fully utilized, and the wind and light discarding problem is caused.
The Chinese patent 109378863A 'weight and constraint associated adjustment power grid real-time power generation control optimization decision method' comprehensively considers economic and environmental protection performance, adjustment performance and spot transaction execution progress of a power generation station, power plant output impact characteristics on safety and stability of a power grid, and the like, sets up a weight, proposes comprehensive performance indexes of the power generation station, establishes a linear programming model with the maximum sum of power generation station active power weighted by the performance indexes as a target, adjusts the output weight of the related power generation station under the condition that monitoring equipment/channel power is not limited, realizes association of the weight and the constraint, and ensures that the power grid power generation station active power control meets the requirements of real-time performance, safety, economic and environmental protection and transaction constraint. However, the influence of the new energy prediction deviation is not considered, and the maximum new energy consumption capability can not be obtained by fully utilizing the power transmission capability of the external tie line of the power grid, the negative hot standby replacement space and the like under the constraint of ensuring the safe and reliable operation of the power grid.
Disclosure of Invention
In order to solve the problems, the application provides an online calculation method and device for the maximum capacity of the power grid, which take the uncertainty of new energy into consideration, and the online evaluation of the maximum capacity of the new energy is realized by taking the uncertainty of the new energy into consideration under the constraint condition of safe and reliable operation of the power grid.
The technical scheme adopted by the application is as follows:
the application provides an online computing method for the maximum capacity of power grid taking new energy uncertainty into consideration, which comprises the following steps:
based on the current power grid running state, calculating to obtain the active command of the new energy station at the moment t by taking the maximum sum of the active commands of the new energy station at the moment t of the capacity assessment as an optimization target;
based on the active instruction and the active predicted value of the new energy station, determining a new energy station set N with the upper limit of the active instruction up-regulated at the moment t;
calculating a new upper limit of an active instruction at the moment t of a new energy station in the new energy station set N according to the active predicted value of the new energy station and the available installed capacity;
taking the maximum sum of active instructions at the moment t of the new energy station in the new energy station set N as an optimization target, and calculating to obtain the active instructions at the moment t of the new energy station in the new energy station set N;
and determining the maximum capacity of the power grid t according to the calculated active command and the new upper limit of the active command at the moment of the new energy station in the new energy station set N.
Further, the calculation results in that the active instruction at the moment t of the new energy station needs to satisfy:
and taking the active predicted value of the new energy station at the moment t as the active instruction upper limit, and taking into account the adjustable space of the active equipment of the power grid at the moment t and the safe and reliable operation constraint condition I of the power grid at the moment t.
Further, the adjustable space of the active equipment of the power grid at the moment t comprises an active real-time control space and a hot standby space of each active equipment in the power grid at the moment t; the power grid active equipment comprises power equipment in the power grid and an external power grid connecting line, the power equipment in the power grid comprises a power generation system, a load system, an energy storage system and a direct current system, and the external power grid connecting line comprises an alternating current connecting line and a direct current connecting line.
Further, the first constraint condition for safe and reliable operation of the power grid at the time t comprises: the active constraint of the safe and stable power transmission channel of the power grid at the moment t, the active constraint of the combination of the external connecting lines of the power grid, the total active constraint of the external connecting lines of the power grid and the hot standby capacity constraint of the power grid;
the active constraint of the safe and stable power transmission channel of the power grid at the moment t means that the active of the safe and stable power transmission channel of the power grid at the moment t is not more than an active forward limit and not less than an active reverse limit;
the active constraint of the external connection line combination of the power grid at the moment t means that the absolute value of the difference between the active and the active planned value of the external connection line combination of the power grid at the moment t is not more than the active deviation limit value;
the total active constraint of the external connecting line of the power grid at the moment t means that the absolute value of the difference between the total active of the external connecting line of the power grid at the moment t and the total active planning value is not greater than the total active deviation limit value;
the t-moment power grid hot standby capacity constraint means that the power grid positive hot standby capacity is not smaller than the positive hot standby capacity limit value and the power grid negative hot standby capacity is not smaller than the negative hot standby capacity limit value.
Further, for the power equipment in the power grid and the power grid external direct current tie-line which run according to the active planning value or the active predicted value at the moment t, the active instruction of the active equipment at the moment t is directly set as the active planning value or the active predicted value at the moment t.
Further, the determining the new energy station set N with the upper limit of the active command up-regulated at the time t includes:
determining a power transmission channel set SLu with active power equal to an active forward limit at t moment in a power grid safety and stability power transmission channel set SL at t moment, determining a power transmission channel set SLd with active power equal to an active reverse limit at t moment in the power grid at t moment, and determining a new energy field station set A with active command equal to an active predicted value of a new energy field station at t moment;
under the condition that the power grid external connecting line is active and the outflow power grid is positive, if the difference between the total active power of the power grid external connecting line and the total active power planning value is equal to the total active power deviation limit value or the negative hot standby capacity of the power grid is equal to the negative hot standby capacity limit value at the moment t, setting N as an empty set, otherwise, marking the set formed by at least 1 power transmission channel in the active pair SLu in the new energy station set A at the moment t as Au, and recording the set formed by at least 1 power transmission channel in the active pair SLd in the new energy station set A as AuAs N->Is the complement of Au.
Further, the calculating the new upper limit of the active command at the moment t of the new energy station in the new energy station set N includes:
ΔP h.d ＝P h.d.1 -P h.d.s
ΔP N ＝αmin(ΔP TL ,ΔP h.d )
wherein DeltaP TL The total active power increasable maximum value of the external connecting line of the power grid at the moment t is P TL.s For the total active planning value of the external connecting line of the power grid at the moment t, P TL.1 For the total active power of the external connecting line of the time t network,ε TL for the total active deviation limit value delta P of the external connecting line of the power grid at the moment t h.d For the maximum value of the active increment corresponding to the negative hot standby capacity of the power grid at the moment t, P h.d.1 For the negative hot standby capacity of the power grid at the moment t, P h.d.s For the negative hot standby capacity limit value of the power grid at the moment t, delta P N For the new energy station set N, the new upper limit of the new energy station t moment active instruction relative to the incremental maximum value of the active predicted value, alpha is a set parameter, 0<α≤1；
Based on the active predicted value of the new energy station at the moment t, taking the sum of the active distribution amounts of the new energy stations in the new energy station set N as the maximum optimization target, and considering that the sum of the active distribution amounts of the new energy stations in the new energy station set N is not more than delta P N Determining the active allocation amount of each new energy station in the new energy station set N, wherein the sum of the active prediction value and the active allocation amount at the moment t of the new energy station is not greater than the available installed capacity constraint;
and taking the sum of the active allocation amount of each new energy station in the new energy station set N and the active predicted value at the moment t as a new upper limit of the active instruction at the moment t of each new energy station.
Further, the active instruction at the moment t of the new energy station in the new energy station set N obtained by calculation needs to satisfy:
taking an adjustable space from an active predicted value of a new energy station in the new energy station set N at the moment t to a new upper limit of an active instruction and a safe and reliable operation constraint condition II of a power grid into consideration;
the safe and reliable operation constraint conditions of the power grid are as follows: and at the moment t, the power grid safely and stably transmits the active constraint of the channel, the active constraint of the combination of the external tie lines of the power grid and the total active constraint of the external tie lines of the power grid.
Further, the determining the maximum capacity of the power grid t according to the calculated active command and the new upper limit of the active command at the time of the new energy station t in the new energy station set N includes:
calculating the ratio of the active power to be allocated quantity delta P to the sum of the active power predicted values at the moment t of the new energy stations in the new energy station set M, and comparing the active power predicted values at the moment t of each new energy station in the set M with the ratioThe product of the new energy stations is taken as the active pre-allocation of each new energy station; wherein the initial value of the active to-be-distributed quantity delta P is set as delta P N Setting an initial value of a new energy station set M of which the active allocation amount needs to be determined as N;
if the sum of the active pre-allocation amount of at least 1 new energy station in M and the active predicted value at the moment t is larger than the available installed capacity at the moment t, the new energy station with the sum of the active pre-allocation amount and the active predicted value at the moment t being larger than the available installed capacity at the moment t is taken as the finally determined active allocation amount, the new energy station is removed from updating M, otherwise, the active pre-allocation amount of the new energy station in M is taken as the finally determined active allocation amount, and the allocation of delta P is ended;
if M is not null, use ΔP N And (3) withThe difference between the sum of active distribution amounts of the new energy stations is updated delta P, and the active pre-distribution amounts are divided again to be +.>Complement to M; otherwise, the distribution of Δp is ended.
The embodiment of the application also provides an online computing device for the maximum power consumption capability of the power grid considering the uncertainty of the new energy, which comprises the following steps:
the first calculation module is used for calculating and obtaining the active command of the new energy station at the moment t by taking the maximum sum of the active commands of the new energy station at the moment t of the capacity assessment based on the running state of the power grid at the moment at present as an optimization target;
the screening module is used for determining a new energy station set N with the upper limit of the active command up-regulated at the moment t based on the active command and the active predicted value of the new energy station;
the second calculation module is used for calculating a new upper limit of an active instruction at the moment t of the new energy station in the new energy station set N according to the active predicted value of the new energy station and the available installed capacity;
the third calculation module is used for calculating and obtaining the active command of the new energy station t in the new energy station set N by taking the sum of the active commands of the new energy station t in the new energy station set N as the maximum optimization target;
the method comprises the steps of,
the distribution module is used for determining the maximum capacity of the power grid t according to the calculated active command and the new upper limit of the active command at the moment of the new energy station t in the new energy station set N.
Further, the screening module is specifically used for,
determining a power transmission channel set SLu with active power equal to an active forward limit at t moment in a power grid safety and stability power transmission channel set SL at t moment, determining a power transmission channel set SLd with active power equal to an active reverse limit at t moment in the power grid at t moment, and determining a new energy field station set A with active command equal to an active predicted value of a new energy field station at t moment;
under the condition that the power grid external connecting line is active and the outflow power grid is positive, if the difference between the total active power of the power grid external connecting line and the total active power planning value is equal to the total active power deviation limit value or the negative hot standby capacity of the power grid is equal to the negative hot standby capacity limit value at the moment t, setting N as an empty set, otherwise, marking the set formed by at least 1 power transmission channel in the active pair SLu in the new energy station set A at the moment t as Au, and recording the set formed by at least 1 power transmission channel in the active pair SLd in the new energy station set A as AuAs N->Is the complement of Au.
Further, the second computing module is specifically configured to,
calculating the total active incremental maximum value of the external tie line of the power grid at the moment t:
ΔP h.d ＝P h.d.1 -P h.d.s
ΔP N ＝αmin(ΔP TL ,ΔP h.d )
wherein DeltaP TL The total active power increasable maximum value of the external connecting line of the power grid at the moment t is P TL.s For the total active planning value of the external connecting line of the power grid at the moment t, P TL.1 For the total power of the external connecting line of the t-moment network epsilon TL For the total active deviation limit value delta P of the external connecting line of the power grid at the moment t h.d For the maximum value of the active increment corresponding to the negative hot standby capacity of the power grid at the moment t, P h.d.1 For the negative hot standby capacity of the power grid at the moment t, P h.d.s For the negative hot standby capacity limit value of the power grid at the moment t, delta P N For the new energy station set N, the new upper limit of the new energy station t moment active instruction relative to the incremental maximum value of the active predicted value, alpha is a set parameter, 0<α≤1；
Based on the active predicted value of the new energy station at the moment t, taking the sum of the active distribution amounts of the new energy stations in the new energy station set N as the maximum optimization target, and considering that the sum of the active distribution amounts of the new energy stations in the new energy station set N is not more than delta P N Determining the active allocation amount of each new energy station in the new energy station set N, wherein the sum of the active prediction value and the active allocation amount at the moment t of the new energy station is not greater than the available installed capacity constraint;
and taking the sum of the active allocation amount of each new energy station in the new energy station set N and the active predicted value at the moment t as a new upper limit of the active instruction at the moment t of each new energy station.
Further, the distribution module is particularly used for,
calculating the ratio of the active power to be allocated quantity delta P to the sum of active power predicted values at the moment t of the new energy stations in the new energy station set M, wherein the active power to be allocated quantity delta P is required to be determined, and taking the product of the active power predicted values at the moment t of each new energy station in the M and the ratio as the active power pre-allocation quantity of each new energy station; wherein the initial value of the active to-be-distributed quantity delta P is set as delta P N Setting an initial value of a new energy station set M of which the active allocation amount needs to be determined as N;
if the sum of the active pre-allocation amount of at least 1 new energy station in M and the active predicted value at the moment t is larger than the available installed capacity at the moment t, the new energy station with the sum of the active pre-allocation amount and the active predicted value at the moment t being larger than the available installed capacity at the moment t is taken as the finally determined active allocation amount, the new energy station is removed from updating M, otherwise, the active pre-allocation amount of the new energy station in M is taken as the finally determined active allocation amount, and the allocation of delta P is ended;
if M is not null, use ΔP N And (3) withThe difference between the sum of active distribution amounts of the new energy stations is updated delta P, and the active pre-distribution amounts are divided again to be +.>Complement to M; otherwise, the distribution of Δp is ended.
The application has the beneficial effects that: according to the method, the active instructions of the power grid active equipment at the examination moment are obtained through optimization calculation, and the new energy station with limited new energy prediction value is rapidly determined; and (3) taking the sum of the active commands of the possibly limited new energy stations as an optimization target to the maximum extent, keeping the active commands of other active devices of the power grid unchanged, and obtaining the new active commands of the new energy stations through iterative optimization calculation, so that the power transmission capacity of the external tie lines and the negative hot standby replacement space of the power grid are fully utilized on the premise of ensuring the safe and reliable operation of the power grid, and the maximum absorption capacity under the influence of uncertainty of the new energy is accurately evaluated.
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Fig. 1 is a flowchart of an online computing method for the maximum capacity of the power grid considering the uncertainty of new energy.
Detailed Description
The application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
As shown in fig. 1, the online computing method for the maximum capacity of the power grid taking the uncertainty of new energy into consideration, provided by the embodiment of the application, comprises the following steps:
step 1: based on the current power grid running state, taking the maximum sum of the active instructions of the new energy station at the moment t of the capacity assessment as an optimization target, taking the active predicted value of the new energy station at the moment t as the upper limit of the active instruction, taking the adjustable space of the active equipment of the power grid at the moment t and the safe and reliable running constraint condition-1 of the power grid at the moment t into account, and obtaining the active instruction at the moment t of the active equipment of the power grid through optimization calculation;
specifically, the power grid active equipment at the time t comprises power grid active equipment and a power grid external connecting line, wherein the power grid active equipment comprises a power generation system, a load system, an energy storage system and a direct current system, and the power grid external connecting line comprises an alternating current connecting line and a direct current connecting line.
Specifically, the adjustable space of the active equipment of the power grid at the time t comprises an active real-time control space and a hot standby space of each active equipment in the power grid at the time t.
Specifically, the safe and reliable operation constraint condition-1 of the power grid at the time t comprises: the active constraint of the safe and stable power transmission channel of the power grid at the moment t, the active constraint of the combination of the external connecting lines of the power grid, the total active constraint of the external connecting lines of the power grid and the hot standby capacity constraint of the power grid;
the active constraint of the safe and stable power transmission channel of the power grid at the moment t means that the active of the safe and stable power transmission channel of the power grid at the moment t is not more than an active forward limit and not less than an active reverse limit; the active constraint of the power grid external connection line combination at the moment t means that the absolute value of the difference between the active and the active plan value of the power grid external connection line combination at the moment t is not greater than the active deviation limit value; the total active constraint of the external connecting line of the power grid at the moment t means that the absolute value of the difference between the total active of the external connecting line of the power grid at the moment t and the total active plan value is not greater than the total active deviation limit value; the power grid hot standby capacity constraint at the moment t refers to that the positive hot standby capacity of the power grid is not smaller than the positive hot standby capacity limit value, and the negative hot standby capacity of the power grid is not smaller than the negative hot standby capacity limit value.
the active power of the safe and stable power transmission channel of the power grid/the active power of the external alternating current tie line of the power grid at the moment t are respectively based on the current moment t 0 Active/external alternating current tie line of power grid safe and stable power transmission channelThe power, the power sensitivity of the power transmission channel/external alternating current tie line is safely and stably controlled according to the power of the power equipment of the power grid at the moment t, and the power command of the power equipment of the power grid at the moment t is relative to t 0 The change amount of the time active power is calculated. Those skilled in the art will be aware of this calculation process, and therefore, a detailed description thereof will be omitted.
the active sensitivity of the active power to the safe and stable power transmission channel/external alternating current tie line of the power grid active equipment at the moment t is based on the relation of the power grid at the moment t to the moment t 0 Equipment switching/reversing change of power grid at moment, for t 0 And performing corresponding equipment switching/backing adjustment on the running state of the power grid at the moment, and calculating based on the adjusted running state of the power grid.
In the embodiment of the application, for the active equipment in the power grid and the external direct current tie-line of the power grid, which run according to the active planning value or the active predicted value at the moment t, the active instruction of the active equipment at the moment t is directly set as the active planning value or the active predicted value at the moment t; the active devices in the power grid running according to the active predicted value are usually distributed new energy sources or small hydropower stations, and the predicted value at the time t can be set to be the current value under the condition that the predicted value is not available.
Step 2: according to boundary characteristics of a safe and reliable operation constraint condition-1 of the power grid at the moment t, a new energy station active instruction and an active predicted value, determining a new energy station set N with the upper limit of the active instruction up-regulated at the moment t; the method comprises the following steps:
determining a power transmission channel set SLu with active power equal to an active forward limit at t moment in a power grid safety and stability power transmission channel set SL at t moment, determining a power transmission channel set SLd with active power equal to an active reverse limit at t moment in the power grid at t moment, and determining a new energy station set A with active command equal to an active predicted value of a new energy station at t moment;
under the condition that the power grid external connecting line is active and the outflow power grid is positive, if the difference between the total active power and the total active power planning value of the power grid external connecting line in the safe and reliable operation constraint condition-1 of the power grid at the moment t is equal to the total active power deviation limit value or the negative hot standby capacity of the power grid is equal to the negative hot standby capacity limit value, setting N as an empty set, otherwise, transmitting at least 1 power in the active power pair SLu at the moment tThe collection of new energy stations with the channel active sensitivity greater than 0 or the channel active sensitivity less than 0 in at least 1 power transmission channel in SLd in A is recorded as Au, and the collection is recorded as AuAs N->Is the complement of Au.
Step 3: determining a new upper limit of an active instruction at the time t of the new energy station in N according to the boundary distance of a safe and reliable operation constraint condition-1 of the power grid at the time t, the active predicted value of the new energy station and the available installed capacity, and if N is an empty set, taking the sum of the active instructions of the new energy at the time t as the maximum value of the new energy consumed by the power grid at the time t, and ending the method;
specifically, the specific method for determining the new upper limit of the active instruction at the moment t of the new energy station in N is as follows:
calculating the total active incremental maximum value of an external tie line of the power grid at the moment t through a formula (1), calculating the active incremental maximum value corresponding to the negative hot standby capacity of the power grid at the moment t through a formula (2), and calculating the incremental maximum value of the active command new upper limit of the power station at the moment t of the new energy station in N relative to the active predicted value through a formula (3), wherein the incremental maximum value is used as the boundary distance of the safe and reliable operation constraint condition-1 of the power grid at the moment t;
ΔP h.d ＝P h.d.1 -P h.d.s (2)
ΔP N ＝αmin(ΔP TL ，ΔP h.d ) (3)
wherein DeltaP TL The total active power increasable maximum value of the external connecting line of the power grid at the moment t is P TL.s For the total active planning value of the external connecting line of the power grid at the moment t, P TL.1 For the total power of the external connecting line of the t-moment network epsilon TL External connection line for power grid at t momentThe total active deviation limit value can determine a specific value according to the total power generation/total load and the standby capacity of the external network at the current moment; ΔP h.d For the maximum value of the active increment corresponding to the negative hot standby capacity of the power grid at the moment t, P h.d.1 For the negative hot standby capacity of the power grid at the moment t, P h.d.s A negative hot standby capacity limit value of the power grid at the moment t; ΔP N For the new upper limit of the active instruction at the moment t of the new energy station in N relative to the maximum increment value of the active predicted value, alpha is a set parameter, 0<Alpha is less than or equal to 1, and can be set to be 0.9 in general;
based on the active predicted value of the new energy station at the moment t, taking the sum of active distribution amounts of the new energy stations in N as the maximum optimization target, and considering that the sum of active distribution amounts of the new energy stations in N is not more than delta P N And determining the active distribution amount of each new energy station in N, and taking the sum of the active distribution amount of each new energy station in N and the active prediction value at the time t as the new upper limit of the active instruction at the time t of each new energy station.
Step 4: under the condition that the active instructions of the power grid active equipment t moment except the new energy station in N are kept unchanged, taking the sum of the active instructions of the new energy station t moment in N as the maximum optimization target, taking an adjustable space from the active predicted value of the new energy station in the moment N to the new upper limit of the active instruction and a safe and reliable operation constraint condition-2 of the power grid into account, and obtaining the active instructions of the new energy station t moment in N through optimization calculation;
specifically, the safe and reliable operation constraint condition-2 of the power grid at the time t comprises: and at the moment t, the power grid safely and stably transmits the active constraint of the channel, the active constraint of the combination of the external tie lines of the power grid and the total active constraint of the external tie lines of the power grid.
Step 5: and (3) if at least 1 new energy station t-moment active instruction in N is equal to the new upper limit of the new active instruction at t-moment, updating the predicted value of the new energy station t-moment active instruction in N to the new upper limit of the new active instruction at t-moment, returning to the step (2), otherwise, taking the sum of the new energy active instructions at t-moment as the maximum value of the new energy consumed at the power grid t-moment, and ending the method.
Specifically, if at least 1 new energy station t moment active instruction in N is equal to the new upper limit of t moment active instruction, updating the new energy station t moment active prediction value in N to the new upper limit of t moment active instruction specifically includes:
setting the initial value of a new energy station set M of which the active distribution amount is to be finally determined as N, and setting the initial value of the active distribution amount delta P as delta P N ；
5-1) calculating the ratio of delta P to the sum of active predicted values at the moment t of the new energy stations in M, and taking the product of the active predicted values at the moment t of each new energy station in M and the ratio as the active pre-allocation amount of each new energy station;
5-2) if the sum of the active pre-allocation amount of at least 1 new energy station in M and the active predicted value at the moment t is larger than the available installed capacity at the moment t, then regarding the new energy station with the sum of the active pre-allocation amount in M and the active predicted value at the moment t being larger than the available installed capacity at the moment t, taking the difference between the available installed capacity at the moment t of the new energy station and the active predicted value at the moment t as the finally determined active allocation amount, removing the new energy station to update M, otherwise, taking the active pre-allocation amount of the new energy station in M as the finally determined active allocation amount, and ending the allocation of delta P;
5-3) if M is not null, ΔP is used N And (3) withThe difference between the sum of the active distribution amounts of the new energy stations is updated to delta P, and the new energy stations return to 5-1), otherwise, the distribution of delta P is ended, & lt/EN & gt>Is the complement of M.
The embodiment of the application also provides an online computing device for the maximum power consumption capability of the power grid considering the uncertainty of the new energy, which comprises the following steps:
the first calculation module is used for calculating and obtaining the active command of the new energy station at the moment t by taking the maximum sum of the active commands of the new energy station at the moment t of the capacity assessment based on the running state of the power grid at the moment at present as an optimization target;
the screening module is used for determining a new energy station set N with the upper limit of the active command up-regulated at the moment t based on the active command and the active predicted value of the new energy station;
the second calculation module is used for calculating a new upper limit of an active instruction at the moment t of the new energy station in the new energy station set N according to the active predicted value of the new energy station and the available installed capacity;
the third calculation module is used for calculating and obtaining the active command of the new energy station t in the new energy station set N by taking the sum of the active commands of the new energy station t in the new energy station set N as the maximum optimization target;
the method comprises the steps of,
the distribution module is used for determining the maximum capacity of the power grid t according to the calculated active command and the new upper limit of the active command at the moment of the new energy station t in the new energy station set N.
Further, the screening module is specifically used for,
determining a power transmission channel set SLu with active power equal to an active forward limit at t moment in a power grid safety and stability power transmission channel set SL at t moment, determining a power transmission channel set SLd with active power equal to an active reverse limit at t moment in the power grid at t moment, and determining a new energy field station set A with active command equal to an active predicted value of a new energy field station at t moment;
under the condition that the power grid external connecting line is active and the outflow power grid is positive, if the difference between the total active power of the power grid external connecting line and the total active power planning value is equal to the total active power deviation limit value or the negative hot standby capacity of the power grid is equal to the negative hot standby capacity limit value at the moment t, setting N as an empty set, otherwise, marking the set formed by at least 1 power transmission channel in the active pair SLu in the new energy station set A at the moment t as Au, and recording the set formed by at least 1 power transmission channel in the active pair SLd in the new energy station set A as AuAs N->Is the complement of Au.
Further, the second computing module is specifically configured to,
calculating the total active incremental maximum value of the external tie line of the power grid at the moment t:
ΔP h.d ＝P h.d.1 -P h.d.s
ΔP N ＝αmin(ΔP TL ,ΔP h.d )
wherein DeltaP TL The total active power increasable maximum value of the external connecting line of the power grid at the moment t is P TL.s For the total active planning value of the external connecting line of the power grid at the moment t, P TL.1 For the total power of the external connecting line of the t-moment network epsilon TL For the total active deviation limit value delta P of the external connecting line of the power grid at the moment t h.d For the maximum value of the active increment corresponding to the negative hot standby capacity of the power grid at the moment t, P h.d.1 For the negative hot standby capacity of the power grid at the moment t, P h.d.s For the negative hot standby capacity limit value of the power grid at the moment t, delta P N For the new energy station set N, the new upper limit of the new energy station t moment active instruction relative to the incremental maximum value of the active predicted value, alpha is a set parameter, 0<α≤1；
Based on the active predicted value of the new energy station at the moment t, taking the sum of the active distribution amounts of the new energy stations in the new energy station set N as the maximum optimization target, and considering that the sum of the active distribution amounts of the new energy stations in the new energy station set N is not more than delta P N Determining the active allocation amount of each new energy station in the new energy station set N, wherein the sum of the active prediction value and the active allocation amount at the moment t of the new energy station is not greater than the available installed capacity constraint;
and taking the sum of the active allocation amount of each new energy station in the new energy station set N and the active predicted value at the moment t as a new upper limit of the active instruction at the moment t of each new energy station.
Further, the distribution module is particularly used for,
calculating the sum of the active power to-be-allocated quantity delta P and the active power predicted value at the moment t of the new energy station in the new energy station set M of which the active power allocation quantity is required to be determinedThe product of the active predicted value of each new energy station t moment in M and the ratio is used as the active pre-allocation of each new energy station; wherein the initial value of the active to-be-distributed quantity delta P is set as delta P N Setting an initial value of a new energy station set M of which the active allocation amount needs to be determined as N;
if the sum of the active pre-allocation amount of at least 1 new energy station in M and the active predicted value at the moment t is larger than the available installed capacity at the moment t, the new energy station with the sum of the active pre-allocation amount and the active predicted value at the moment t being larger than the available installed capacity at the moment t is taken as the finally determined active allocation amount, the new energy station is removed from updating M, otherwise, the active pre-allocation amount of the new energy station in M is taken as the finally determined active allocation amount, and the allocation of delta P is ended;
if M is not null, use ΔP N And (3) withThe difference between the sum of active distribution amounts of the new energy stations is updated delta P, and the active pre-distribution amounts are divided again to be +.>Complement to M; otherwise, the distribution of Δp is ended.
It should be noted that the embodiment of the apparatus corresponds to the embodiment of the method, and the implementation manner of the embodiment of the method is applicable to the embodiment of the apparatus and can achieve the same or similar technical effects, so that the description thereof is omitted herein.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 foregoing is illustrative of the present application and is not to be construed as limiting thereof, but rather as providing for the use of additional embodiments and advantages of all such modifications, equivalents, improvements and similar to the present application are intended to be included within the scope of the present application as defined by the appended claims.

Claims (5)

1. The online calculation method for the maximum capacity of the power grid considering the uncertainty of the new energy is characterized by comprising the following steps of:
based on the current power grid running state, calculating to obtain the active command of the new energy station at the moment t by taking the maximum sum of the active commands of the new energy station at the moment t of the capacity assessment as an optimization target; the active instruction at the moment t of the new energy station obtained through calculation needs to meet the following requirements: taking the active predicted value of the new energy station at the moment t as the upper limit of an active instruction, and considering the adjustable space of active equipment of the power grid at the moment t and the safe and reliable operation constraint condition I of the power grid at the moment t; the adjustable space of the active equipment of the power grid at the moment t comprises an active real-time control space and a hot standby space of each active equipment in the power grid at the moment t; the power grid active equipment comprises power grid internal active equipment and a power grid external connecting line, wherein the power grid internal active equipment comprises a power generation system, a load system, an energy storage system and a direct current system, and the power grid external connecting line comprises an alternating current connecting line and a direct current connecting line; the first constraint condition for safe and reliable operation of the power grid at the moment t comprises the following steps: the active constraint of the safe and stable power transmission channel of the power grid at the moment t, the active constraint of the combination of the external connecting lines of the power grid, the total active constraint of the external connecting lines of the power grid and the hot standby capacity constraint of the power grid; the active constraint of the safe and stable power transmission channel of the power grid at the moment t means that the active of the safe and stable power transmission channel of the power grid at the moment t is not more than an active forward limit and not less than an active reverse limit; the active constraint of the external connection line combination of the power grid at the moment t means that the absolute value of the difference between the active and the active planned value of the external connection line combination of the power grid at the moment t is not more than the active deviation limit value; the total active constraint of the external connecting line of the power grid at the moment t means that the absolute value of the difference between the total active of the external connecting line of the power grid at the moment t and the total active planning value is not greater than the total active deviation limit value; the constraint of the hot standby capacity of the power grid at the moment t means that the positive hot standby capacity of the power grid is not smaller than the limit value of the positive hot standby capacity and the negative hot standby capacity of the power grid is not smaller than the limit value of the negative hot standby capacity; for the power grid internal active equipment and the power grid external direct current tie-line which run according to the active planning value or the active predicted value at the moment t, directly setting the active instruction of the active equipment at the moment t as the active planning value or the active predicted value at the moment t;
based on the active command and the active predicted value of the new energy station, determining a new energy station set N with the upper limit of the active command up-regulated at the moment t comprises the following steps:
determining a power grid at time tA power transmission channel set SLu with the active power equal to the active forward limit at the time t in the safe and stable power transmission channel set SL, a power transmission channel set SLd with the active power equal to the active reverse limit at the time t in the time SL, and a new energy station set A with the active power command equal to the active predicted value at the time t are determined; under the condition that the power grid external connecting line is active and the outflow power grid is positive, if the difference between the total active power of the power grid external connecting line and the total active power planning value is equal to the total active power deviation limit value or the negative hot standby capacity of the power grid is equal to the negative hot standby capacity limit value at the moment t, setting N as an empty set, otherwise, marking the set formed by at least 1 power transmission channel in the active pair SLu in the new energy station set A at the moment t as Au, and recording the set formed by at least 1 power transmission channel in the active pair SLd in the new energy station set A as AuAs N->Complement of Au;
according to the active predicted value and the available installed capacity of the new energy station, calculating a new upper limit of an active instruction at the moment t of the new energy station in the new energy station set N, including:
ΔP h.d ＝P h.d.1 -P h.d.s ；
ΔP N ＝αmin(ΔP TL ,ΔP h.d )；
wherein DeltaP TL The total active power increasable maximum value of the external connecting line of the power grid at the moment t is P TL.s For the total active planning value of the external connecting line of the power grid at the moment t, P TL.1 For the total power of the external connecting line of the t-moment network epsilon TL For the total active deviation limit value delta P of the external connecting line of the power grid at the moment t h.d Maximum value of active increment corresponding to negative hot standby capacity of power grid at t moment，P h.d.1 For the negative hot standby capacity of the power grid at the moment t, P h.d.s For the negative hot standby capacity limit value of the power grid at the moment t, delta P N For the new energy station set N, the new upper limit of the new energy station t moment active instruction relative to the incremental maximum value of the active predicted value, alpha is a set parameter, 0<α≤1；
Based on the active predicted value of the new energy station at the moment t, taking the sum of the active distribution amounts of the new energy stations in the new energy station set N as the maximum optimization target, and considering that the sum of the active distribution amounts of the new energy stations in the new energy station set N is not more than delta P N Determining the active allocation amount of each new energy station in the new energy station set N, wherein the sum of the active prediction value and the active allocation amount at the moment t of the new energy station is not greater than the available installed capacity constraint;
taking the sum of the active allocation amount of each new energy station in the new energy station set N and the active predicted value at the moment t as a new upper limit of an active instruction at the moment t of each new energy station;
taking the maximum sum of active instructions at the moment t of the new energy station in the new energy station set N as an optimization target, and calculating to obtain the active instructions at the moment t of the new energy station in the new energy station set N; the active instructions at the moment t of the new energy station in the new energy station set N are calculated to be satisfied: taking an adjustable space from an active predicted value of a new energy station in the new energy station set N at the moment t to a new upper limit of an active instruction and a safe and reliable operation constraint condition II of a power grid into consideration; the safe and reliable operation constraint conditions of the power grid are as follows: at the moment t, the active constraint of the power transmission channel, the active constraint of the power grid external tie line combination and the total active constraint of the power grid external tie line are safely and stably carried out on the power grid;
according to the calculated new energy station t moment active instruction and new upper limit of the active instruction in the new energy station set N, determining the maximum digestion capacity of the power grid t moment, including:
calculating the ratio of the active power to be allocated quantity delta P to the sum of active power predicted values at the moment t of the new energy stations in the new energy station set M, wherein the active power to be allocated quantity delta P is required to be determined, and taking the product of the active power predicted values at the moment t of each new energy station in the M and the ratio as the active power pre-allocation quantity of each new energy station; wherein the initial value of the active to-be-distributed quantity delta P is set as delta P N Setting an initial value of a new energy station set M of which the active allocation amount needs to be determined as N;
if the sum of the active pre-allocation amount of at least 1 new energy station in M and the active predicted value at the moment t is larger than the available installed capacity at the moment t, the new energy station with the sum of the active pre-allocation amount and the active predicted value at the moment t being larger than the available installed capacity at the moment t is taken as the finally determined active allocation amount, the new energy station is removed from updating M, otherwise, the active pre-allocation amount of the new energy station in M is taken as the finally determined active allocation amount, and the allocation of delta P is ended;
if M is not null, use ΔP N And (3) withThe difference between the sum of active distribution amounts of the new energy stations is updated delta P, and the active pre-distribution amounts are divided again to be +.>Complement to M; otherwise, the distribution of Δp is ended.
2. An online computing device for the maximum power consumption of a power grid taking into account new energy uncertainty, wherein the online computing device is used for realizing the online computing method for the maximum power consumption of the power grid taking into account new energy uncertainty according to claim 1, and the device comprises:
the first calculation module is used for calculating and obtaining the active command of the new energy station at the moment t by taking the maximum sum of the active commands of the new energy station at the moment t of the capacity assessment based on the running state of the power grid at the moment at present as an optimization target;
the screening module is used for determining a new energy station set N with the upper limit of the active command up-regulated at the moment t based on the active command and the active predicted value of the new energy station;
the second calculation module is used for calculating a new upper limit of an active instruction at the moment t of the new energy station in the new energy station set N according to the active predicted value of the new energy station and the available installed capacity;
the third calculation module is used for calculating and obtaining the active command of the new energy station t in the new energy station set N by taking the sum of the active commands of the new energy station t in the new energy station set N as the maximum optimization target;
the method comprises the steps of,
the distribution module is used for determining the maximum capacity of the power grid t according to the calculated active command and the new upper limit of the active command at the moment of the new energy station t in the new energy station set N.
3. The on-line computing device for the maximum capacity of the power grid taking into account the uncertainty of new energy according to claim 2, wherein said screening module is specifically configured to,
determining a power transmission channel set SLu with active power equal to an active forward limit at t moment in a power grid safety and stability power transmission channel set SL at t moment, determining a power transmission channel set SLd with active power equal to an active reverse limit at t moment in the power grid at t moment, and determining a new energy field station set A with active command equal to an active predicted value of a new energy field station at t moment;
under the condition that the power grid external connecting line is active and the outflow power grid is positive, if the difference between the total active power of the power grid external connecting line and the total active power planning value is equal to the total active power deviation limit value or the negative hot standby capacity of the power grid is equal to the negative hot standby capacity limit value at the moment t, setting N as an empty set, otherwise, marking the set formed by at least 1 power transmission channel in the active pair SLu in the new energy station set A at the moment t as Au, and recording the set formed by at least 1 power transmission channel in the active pair SLd in the new energy station set A as AuAs N->Is the complement of Au.
4. The on-line computing device for the maximum capacity of the power grid taking into account the uncertainty of new energy according to claim 2, wherein said second computing module is specifically configured to,
calculating the total active incremental maximum value of the external tie line of the power grid at the moment t:
ΔP h.d ＝P h.d.1 -P h.d.s
ΔP N ＝αmin(ΔP TL ,ΔP h.d )
wherein DeltaP TL The total active power increasable maximum value of the external connecting line of the power grid at the moment t is P TL.s For the total active planning value of the external connecting line of the power grid at the moment t, P TL.1 For the total power of the external connecting line of the t-moment network epsilon TL For the total active deviation limit value delta P of the external connecting line of the power grid at the moment t h.d For the maximum value of the active increment corresponding to the negative hot standby capacity of the power grid at the moment t, P h.d.1 For the negative hot standby capacity of the power grid at the moment t, P h.d.s For the negative hot standby capacity limit value of the power grid at the moment t, delta P N For the new energy station set N, the new upper limit of the new energy station t moment active instruction relative to the incremental maximum value of the active predicted value, alpha is a set parameter, 0<α≤1；
Based on the active predicted value of the new energy station at the moment t, taking the sum of the active distribution amounts of the new energy stations in the new energy station set N as the maximum optimization target, and considering that the sum of the active distribution amounts of the new energy stations in the new energy station set N is not more than delta P N Determining the active allocation amount of each new energy station in the new energy station set N, wherein the sum of the active prediction value and the active allocation amount at the moment t of the new energy station is not greater than the available installed capacity constraint;
and taking the sum of the active allocation amount of each new energy station in the new energy station set N and the active predicted value at the moment t as a new upper limit of the active instruction at the moment t of each new energy station.
5. The on-line computing device for the maximum capacity of the power grid taking into account the uncertainty of new energy according to claim 4, wherein said distribution module is specifically configured to,
calculating the ratio of the active power to be allocated quantity delta P to the sum of active power predicted values at the moment t of the new energy stations in the new energy station set M, wherein the active power to be allocated quantity delta P is required to be determined, and taking the product of the active power predicted values at the moment t of each new energy station in the M and the ratio as the active power pre-allocation quantity of each new energy station; wherein the initial value of the active to-be-distributed quantity delta P is set as delta P N Setting an initial value of a new energy station set M of which the active allocation amount needs to be determined as N;
if the sum of the active pre-allocation amount of at least 1 new energy station in M and the active predicted value at the moment t is larger than the available installed capacity at the moment t, the new energy station with the sum of the active pre-allocation amount and the active predicted value at the moment t being larger than the available installed capacity at the moment t is taken as the finally determined active allocation amount, the new energy station is removed from updating M, otherwise, the active pre-allocation amount of the new energy station in M is taken as the finally determined active allocation amount, and the allocation of delta P is ended;
if M is not null, use ΔP N And (3) withThe difference between the sum of active distribution amounts of the new energy stations is updated delta P, and the active pre-distribution amounts are divided again to be +.>Complement to M; otherwise, the distribution of Δp is ended.
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