Power distribution area operation method, system and equipment considering flexible load regulation and control

Abstract

The invention provides a power distribution area operation method, system and equipment considering flexible load regulation and control. The method comprises the steps of evaluating a power regulation and control demand range of a power distribution area at each moment based on transmission power constraints of the power distribution area at each moment; determining a flexible load demand response probability based on the compensation electricity price and a flexible load response probability limit value; based on the flexible load demand response probability and the maximum regulation potential of the flexible load, calculating a flexible load regulation potential range of the power distribution area at each moment; and based on the power regulation and control demand range and the flexible load regulation and control potential range at each moment, combining a pre-constructed power distribution area regulation and control cost-benefit model to obtain load regulation power at each moment. According to the method, the load regulation power and the operation benefit at each moment are determined based on the intersection of the power distribution area regulation and control demand and the flexible load potential range in combination with the regulation and control cost-benefit analysis model, so that the problem of less regulation research by using the flexible load at present is solved, the model solution space is effectively reduced, and low-carbon operation regulation and control are realized.

Description

Technical Field

[0001] The present invention relates to the field of optimized operation of a distribution station area, and in particular to a distribution station area operation method, system and equipment taking flexible load regulation into consideration. Background Art

[0002] In recent years, due to the influx of a high proportion of flexible loads into distribution substations and the gradual increase in the penetration rate of distributed renewable energy such as wind and solar power, the randomness and volatility of the power load characteristics in distribution substations have increased, the peak-to-valley difference has intensified, and even power reverse has occurred, bringing more challenges to the optimized operation of distribution substations.

[0003] In response to the above problems, the distribution station area can achieve low-carbon economic operation by integrating the internal decentralized adjustable flexible resources, guiding each flexible load to adjust the power consumption, and adjusting the power purchased and sold by the distribution station area to the superior power grid. However, in related technologies, the method of using user-side demand response capabilities and step-type carbon taxes to achieve peak shaving and valley filling and carbon reduction and emission reduction is widely used, which fails to make the distribution station area's regulation demand and flexible load regulation potential coordinate with each other, making it difficult to achieve optimal control of the distribution station area. Summary of the invention

[0004] In order to solve the problem that the prior art fails to coordinate the control demand of the distribution station area with the control potential of the flexible load, and it is difficult to achieve the optimized control of the distribution station area, the present invention provides a day-ahead low-carbon economic operation method of the distribution station area considering the flexible load control, comprising:

[0005] Evaluate the power control demand range of the distribution station area at each moment based on the transmission power constraints of the distribution station area at each moment;

[0006] Determine the flexible load demand response probability at the demand response time based on the compensation electricity price and the flexible load response probability limit;

[0007] Calculate the flexible load regulation potential range at each moment in the distribution station area based on the flexible load demand response probability at the demand response moment and the maximum regulation potential of the flexible load;

[0008] Based on the power regulation demand range of the power distribution area at each moment and the flexible load regulation potential range of the power distribution area at each moment, combined with the pre-constructed power distribution area regulation cost-benefit model, the load regulation power of the power distribution area at each moment is obtained;

[0009] The distribution substation area regulation cost-benefit model is constructed by considering the distribution substation area regulation demand and flexible load regulation potential, with the goal of maximizing regulation benefits and combining constraints.

[0010] Preferably, the evaluating the power control requirement range of the distribution station area at each moment based on the transmission power constraint of the distribution station area at each moment includes:

[0011] Determine the regulation period of the power of the distribution station area based on the power of the distribution station area at each moment and the limit of the load rate and peak-to-valley difference of the distribution station area;

[0012] The power regulation demand range of the distribution station area at each moment is determined based on the average transmission power of the distribution station area in each regulation period, the actual transmission power and the transmission power constraint at each moment in each regulation period.

[0013] Preferably, the regulation period of the power distribution station area includes: an upward regulation period and a downward regulation period;

[0014] The upward adjustment period is determined based on the power of the distribution network at each moment and the load rate of the distribution station area and the lower limit of the peak-to-valley difference;

[0015] The downward adjustment period is determined based on the power of the distribution network at each moment and the load rate of the distribution station area and the upper limit of the peak-to-valley difference.

[0016] Preferably, the step of determining the power regulation requirement range of the distribution station area at each moment based on the transmission power average value of the distribution station area in each regulation period, the actual transmission power, and the transmission power constraint at each moment in each regulation period includes:

[0017] When the power of the distribution station area is in a down-regulation period, the power down-regulation requirement range of the distribution station area in the down-regulation period is determined based on the actual transmission power of the distribution station area in the down-regulation period, the maximum load rate constraint of the distribution station area, the peak-to-valley rate constraint and the average transmission power of the distribution station area;

[0018] When the power of the distribution station area is in the period of increase, the power increase requirement range of the distribution station area in the period of increase is determined based on the actual transmission power of the distribution station area in the period of increase, the maximum load rate constraint of the distribution station area, the maximum allowable reverse power constraint, the peak-to-valley difference rate constraint and the average transmission power of the distribution station area;

[0019] Determine the power regulation demand range of the power distribution area at each moment according to the power down regulation demand range of the power distribution area during the down regulation period and the power up regulation demand range of the power distribution area during the up regulation period;

[0020] The transmission power constraints of the distribution station area at each moment include: a maximum load rate constraint of the distribution station area, a maximum allowable reverse transmission power constraint and a peak-to-valley difference rate constraint.

[0021] Preferably, the flexible load demand response probability at the demand response time is calculated as follows:

[0022]

[0023] In the formula, κ t，i is the demand response probability of flexible load i at time t; κ max，t，iis the maximum demand response probability of flexible load i at time t; κ min，t，i is the minimum demand response probability of flexible load i at time t; c max，i is the maximum compensation price for flexible load i in the distribution area; c min，i is the minimum compensation price for flexible load i in the distribution area; c bc，t，i is the actual compensation electricity price for flexible load i in the distribution station area at time t; t is the time; i is the flexible load at the time of downward adjustment.

[0024] Preferably, the flexible load regulation potential range of the distribution station area at each moment is determined by the total flexible load downward adjustment potential and the total flexible load upward adjustment potential, which is calculated as follows:

[0025]

[0026] In the formula, ΔP down (t) is the total potential amount of flexible load reduction at time t; ΔP up (t) is the total potential of flexible load upward adjustment at time t; ΔP down，i (t) is the maximum downward adjustment potential of flexible load i at time t; ΔP up，j (t) is the maximum upward adjustment potential of flexible load j at time t; D down D is the set of load points within the distribution station area that can adjust power downward; up is the set of load points with power increase within the distribution station area; κ t，i is the demand response probability of flexible load i at time t; t is the time; i is the flexible load when it is down-regulated; j is the flexible load when it is up-regulated; κ t，j is the demand response probability of flexible load j at time t.

[0027] Preferably, the construction of the distribution station area regulation cost-benefit model includes:

[0028] Construct an objective function with the goal of maximizing the regulation benefit within a set period of time;

[0029] and setting constraints for the objective function; the constraints include power distribution area benefit constraints and flexible load regulation potential constraints;

[0030] A distribution station area regulation cost-benefit model is constructed based on the objective function, the distribution station area benefit constraint condition and the flexible load regulation potential constraint condition.

[0031] Preferably, the objective function is constructed with the goal of maximizing the regulation benefit within a set period of time, including:

[0032] The operating cost of the distribution station area in the set period before regulation is calculated based on the environmental value of carbon dioxide before regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the purchased and sold electricity power of the distribution station area, and the purchased and sold electricity cost per unit of power in the distribution station area;

[0033] The operating cost of the distribution station area within the set period after regulation is calculated based on the environmental value of carbon dioxide after regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the power purchase and sale of the distribution station area, the power purchase and sale cost per unit of power in the distribution station area, the compensation cost of the regulated power, and the regulated power value of the distribution station area;

[0034] An objective function for maximizing regulation benefits within a set period of time is constructed by using the maximum value of the difference between the operating cost within a set period of time before the distribution station area is regulated and the operating cost within a set period of time after the distribution station area is regulated.

[0035] Preferably, the method further comprises correcting the power regulation demand range of the distribution station area based on the carbon emission range.

[0036] Preferably, the method of correcting the power regulation demand range of the distribution station area based on the carbon emission range includes:

[0037] Based on the carbon emission range, the fuzzy C-means clustering algorithm is used to divide carbon emissions into peak period, middle period and valley period.

[0038] When carbon emissions are at their peak, if the power demand in the distribution station area is in a period of power reduction or does not require regulation, the power demand will be reduced; otherwise, during the period of power increase in the distribution station area, the power demand will be increased to the minimum value of the power increase demand range;

[0039] When carbon emissions are in the middle period, no correction will be made to the power reduction period of the power distribution area, the power increase period of the power distribution area, and the power distribution area power that does not need to be regulated;

[0040] When carbon emissions are at a low point, the power demand of the power distribution area during the period of power reduction or increase will be corrected, and the power demand of the power distribution area during the period when no regulation is required will not be corrected;

[0041] The regulation period of the power distribution area includes: a period without regulation;

[0042] The period of time that does not require regulation is determined based on the time corresponding to the power that does not require regulation of the distribution network.

[0043] Preferably, when the carbon emissions are at a low point, the power demand of the power distribution station area during the power down-regulation period or the power up-regulation period is corrected, including:

[0044] When the power of the distribution station area is in the period of power reduction, the power demand is reduced to the minimum value of the power reduction demand range;

[0045] When the power of the distribution station area is in the increase period, increase the power.

[0046] Based on the same inventive concept, the present invention also provides a distribution substation operation system considering flexible load regulation, including:

[0047] A demand range determination module is used to evaluate the power control demand range of the distribution station area at each moment based on the transmission power constraints of the distribution station area at each moment;

[0048] An acquisition probability module is used to determine the flexible load demand response probability at the demand response time based on the compensation electricity price and the flexible load response probability limit;

[0049] A potential range determination module, used to calculate the flexible load regulation potential range at each moment in the distribution station area based on the flexible load demand response probability at the demand response moment and the maximum regulation potential of the flexible load;

[0050] A power calculation module, used to obtain the load regulation power of the distribution station area at each moment based on the power regulation demand range of the distribution station area at each moment and the flexible load regulation potential range of the distribution station area at each moment in combination with a pre-constructed distribution station area regulation cost-benefit model;

[0051] The distribution substation area regulation cost-benefit model is constructed by considering the distribution substation area regulation demand and flexible load regulation potential, with the goal of maximizing regulation benefits and combining constraints.

[0052] Preferably, it is characterized in that the demand range determination module includes:

[0053] The time period determination submodule is used to determine the regulation period of the power of the distribution station area based on the power of the distribution station area at each moment and the load rate and peak-to-valley difference limit of the distribution station area;

[0054] The control range submodule is used to determine the power control requirement range of the distribution station area at each moment based on the average transmission power of the distribution station area in each adjustment period, the actual transmission power and the transmission power constraint at each moment in each adjustment period.

[0055] Preferably, the time period determination submodule specifically includes: an upward adjustment time period and a downward adjustment time period;

[0056] The upward adjustment period is determined based on the power of the distribution network at each moment and the load rate of the distribution station area and the lower limit of the peak-to-valley difference;

[0057] The downward adjustment period is determined based on the power of the distribution network at each moment and the load rate of the distribution station area and the upper limit of the peak-to-valley difference.

[0058] Preferably, the control range submodule is specifically used for:

[0059] When the power of the distribution station area is in a down-regulation period, the power down-regulation requirement range of the distribution station area in the down-regulation period is determined based on the actual transmission power of the distribution station area in the down-regulation period, the maximum load rate constraint of the distribution station area, the peak-to-valley rate constraint and the average transmission power of the distribution station area;

[0060] When the power of the distribution station area is in the period of increase, the power increase requirement range of the distribution station area in the period of increase is determined based on the actual transmission power of the distribution station area in the period of increase, the maximum load rate constraint of the distribution station area, the maximum allowable reverse power constraint, the peak-to-valley difference rate constraint and the average transmission power of the distribution station area;

[0061] Determine the power regulation demand range of the power distribution area at each moment according to the power down regulation demand range of the power distribution area during the down regulation period and the power up regulation demand range of the power distribution area during the up regulation period;

[0062] The transmission power constraints of the distribution station area at each moment include: a maximum load rate constraint of the distribution station area, a maximum allowable reverse transmission power constraint and a peak-to-valley difference rate constraint.

[0063] Preferably, the flexible load demand response probability at the demand response time is calculated as follows:

[0064]

[0065] In the formula, κ t，i is the demand response probability of flexible load i at time t; κ max，t，i is the maximum demand response probability of flexible load i at time t; κ min，t，i is the minimum demand response probability of flexible load i at time t; c max，i is the maximum compensation price for flexible load i in the distribution area; c min，i is the minimum compensation price for flexible load i in the distribution area; c bc，t，i is the actual compensation electricity price for flexible load i in the distribution station area at time t; t is the time; i is the flexible load at the time of downward adjustment.

[0066] Preferably, the flexible load regulation potential range of the distribution station area at each moment is determined by the total flexible load downward adjustment potential and the total flexible load upward adjustment potential, which is calculated as follows:

[0067]

[0068] In the formula, ΔP down (t) is the total potential amount of flexible load reduction at time t; ΔP up (t) is the total potential of flexible load upward adjustment at time t; ΔP down，i (t) is the maximum downward adjustment potential of flexible load i at time t; ΔP up，j (t) is the maximum upward adjustment potential of flexible load j at time t; D downD is the set of load points within the distribution station area that can adjust power downward; up is the set of load points with power increase within the distribution station area; κ t，i is the demand response probability of flexible load i at time t; t is the time; i is the flexible load when it is down-regulated; j is the flexible load when it is up-regulated; κ t，j is the demand response probability of flexible load j at time t.

[0069] Preferably, it also includes a power distribution area regulation cost-benefit model construction module, and the power distribution area regulation cost-benefit model construction module includes:

[0070] The objective function construction submodule is used to construct the objective function with the goal of maximizing the regulation benefit within a set period of time;

[0071] A constraint construction submodule, used to set constraint conditions for the objective function, wherein the constraint conditions include a power distribution station area benefit constraint condition and a flexible load regulation potential constraint condition;

[0072] The model building submodule is used to build a distribution network area regulation cost-benefit model based on the objective function, the distribution network area benefit constraint condition and the flexible load regulation potential constraint condition.

[0073] Preferably, the objective function construction submodule is specifically used for:

[0074] The operating cost of the distribution station area in the set period before regulation is calculated based on the environmental value of carbon dioxide before regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the purchased and sold electricity power of the distribution station area, and the purchased and sold electricity cost per unit of power in the distribution station area;

[0075] The operating cost of the distribution station area within the set period after regulation is calculated based on the environmental value of carbon dioxide after regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the power purchase and sale of the distribution station area, the power purchase and sale cost per unit of power in the distribution station area, the compensation cost of the regulated power, and the regulated power value of the distribution station area;

[0076] An objective function for maximizing regulation benefits within a set period of time is constructed by using the maximum value of the difference between the operating cost within a set period of time before the distribution station area is regulated and the operating cost within a set period of time after the distribution station area is regulated.

[0077] Preferably, a correction module is also included.

[0078] Preferably, the correction module comprises:

[0079] The zone-level division submodule is used to divide carbon emissions into peak, middle and valley periods based on the carbon emission interval using the fuzzy C-means clustering algorithm;

[0080] The peak correction submodule is used to adjust the power down when the carbon emission is at its peak, if the power of the distribution station area is in a period of power reduction or does not need to be adjusted, otherwise the power demand is increased to the minimum value of the power increase demand range during the period of power increase in the distribution station area;

[0081] The intermediate correction submodule is used to make no corrections during the period when the carbon emissions are in the intermediate period, during the period when the power of the power distribution area is reduced, during the period when the power of the power distribution area is increased, and during the period when the power of the power distribution area does not need to be regulated;

[0082] The valley correction submodule is used to correct the power demand of the power distribution area during the period of power reduction or increase when the carbon emission is at the valley period, and does not correct the power demand of the power distribution area during the period when the power does not need to be adjusted;

[0083] The regulation period of the power distribution area includes: a period without regulation;

[0084] The period of time that does not require regulation is determined based on the time corresponding to the power that does not require regulation of the distribution network.

[0085] Preferably, the trough correction submodule is specifically used for:

[0086] When the power of the distribution station area is in the period of power reduction, the power demand is reduced to the minimum value of the power reduction demand range;

[0087] When the power of the distribution station area is in the increase period, increase the power.

[0088] On the other hand, the present application also provides a computer device, comprising:

[0089] one or more processors;

[0090] The processor is used to store one or more programs;

[0091] When the one or more programs are executed by the one or more processors, the above-mentioned distribution station area operation method considering flexible load regulation is implemented.

[0092] On the other hand, the present application also provides a computer-readable storage medium, characterized in that a computer program is stored thereon, and when the computer program is executed, the above-mentioned distribution station area operation method considering flexible load regulation is implemented.

[0093] Compared with the prior art, the present invention has the following beneficial effects:

[0094] The present invention provides a distribution substation operation method considering flexible load regulation, including: evaluating the power regulation demand range of the distribution substation at each moment based on the transmission power constraint of the distribution substation at each moment; determining the flexible load demand response probability at the demand response moment based on the compensation electricity price and the flexible load response probability limit; calculating the flexible load regulation potential range of the distribution substation at each moment based on the flexible load demand response probability at the demand response moment and the maximum regulation potential of the flexible load; obtaining the load regulation power of the distribution substation at each moment based on the power regulation demand range of the distribution substation at each moment and the flexible load regulation potential range of the distribution substation at each moment combined with a pre-constructed distribution substation regulation cost-benefit model; wherein the distribution substation regulation cost-benefit model is constructed by considering the regulation demand of the distribution substation and the flexible load regulation potential, with the goal of maximizing the regulation benefit and combining constraints. The present invention determines the power regulation demand range of the distribution substation based on the intersection of the distribution substation regulation demand range and the flexible load regulation potential range of the distribution substation, realizes the coordination of the distribution substation regulation demand and the flexible load regulation potential, and thus realizes the optimized control of the distribution substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] Figure 1 It is a flow chart of a distribution station area operation method considering flexible load regulation provided by the present invention;

[0096] Figure 2 It is a schematic diagram of the control demand of the distribution station area of ​​the present invention;

[0097] Figure 3 is a relationship diagram between the compensation electricity price and the demand response probability of the present invention;

[0098] Figure 4 It is an overall flow chart provided by an embodiment of the present invention;

[0099] Figure 5 It is a structural diagram of a distribution substation operation system considering flexible load regulation provided by the present invention;

[0100] Figure 6 It is a typical daily purchased power curve diagram of the distribution station area of ​​the present invention;

[0101] Figure 7 It is a time-based electricity price curve diagram of the distribution station area of ​​the present invention;

[0102] Figure 8 is a graph of typical daily carbon emission factors of a distribution station area of ​​the present invention;

[0103] Fig. 9 It is a comparison diagram of the operating results of the present invention. DETAILED DESCRIPTION

[0104] In order to better understand the present invention, the content of the present invention is further described below in conjunction with the accompanying drawings and examples.

[0105] Embodiment 1:

[0106] The present invention provides a distribution station area operation method considering flexible load regulation, such as Figure 1 As shown, including:

[0107] Step 1: Evaluate the power control demand range of the distribution area at each moment based on the transmission power constraint of the distribution area at each moment;

[0108] Step 2: Determine the flexible load demand response probability at the demand response time based on the compensation electricity price and the flexible load response probability limit;

[0109] Step 3: Calculate the flexible load regulation potential range at each moment in the distribution station area based on the flexible load demand response probability at the demand response moment and the maximum regulation potential of the flexible load;

[0110] Step 4: Based on the power regulation demand range of the distribution substation at each moment and the flexible load regulation potential range of the distribution substation at each moment, combined with the pre-constructed distribution substation regulation cost-benefit model, the load regulation power of the distribution substation at each moment is obtained;

[0111] The distribution substation area regulation cost-benefit model is constructed by considering the distribution substation area regulation demand and flexible load regulation potential, with the goal of maximizing regulation benefits and combining constraints.

[0112] In step 1, the power control demand range of the distribution station area at each moment is evaluated based on the transmission power constraint of the distribution station area at each moment, specifically including:

[0113] Determine the regulation period of the power of the distribution station area based on the power of the distribution station area at each moment and the limit of the load rate and peak-to-valley difference of the distribution station area;

[0114] The power regulation demand range of the distribution station area at each moment is determined based on the average transmission power of the distribution station area in each regulation period, the actual transmission power and the transmission power constraint at each moment in each regulation period.

[0115] Further, the power regulation period of the distribution station area is determined based on the power of the distribution station area at each moment and the load rate and peak-to-valley difference limit of the distribution station area, specifically including:

[0116] The upward adjustment period is determined based on the power of the distribution network at each moment and the load rate of the distribution station area and the lower limit of the peak-to-valley difference;

[0117] The downward adjustment period is determined based on the power of the distribution network at each moment and the load rate of the distribution station area and the upper limit of the peak-to-valley difference.

[0118] Considering the maximum load rate constraint, the maximum allowable reverse transmission power constraint and the peak-valley difference rate constraint, the upper and lower limits of the transmission power constraint are calculated to take into account the operation safety of the distribution station area and carbon reduction and emission reduction. If the load power of the distribution station area exceeds the limit, it must be regulated. If the load rate and peak-valley difference upper limit of the distribution station area are exceeded, Figure 2 The T1 time period is the power reduction period, the period of exceeding the load rate of the distribution station area and the peak-to-valley difference lower limit, such as Figure 2 The T2 time period is the power increase period.

[0119] Furthermore, based on the average transmission power of the distribution station area in each adjustment period, the actual transmission power and the transmission power constraint at each moment in each adjustment period, the power control demand range of the distribution station area at each moment is determined, specifically including:

[0120] When the power of the distribution station area is in a down-regulation period, the power down-regulation requirement range of the distribution station area in the down-regulation period is determined based on the actual transmission power of the distribution station area in the down-regulation period, the maximum load rate constraint of the distribution station area, the peak-to-valley rate constraint and the average transmission power of the distribution station area;

[0121] When the power of the distribution station area is in the period of increase, the power increase requirement range of the distribution station area in the period of increase is determined based on the actual transmission power of the distribution station area in the period of increase, the maximum load rate constraint of the distribution station area, the maximum allowable reverse power constraint, the peak-to-valley difference rate constraint and the average transmission power of the distribution station area;

[0122] Determine the power regulation demand range of the power distribution area at each moment according to the power down regulation demand range of the power distribution area during the down regulation period and the power up regulation demand range of the power distribution area during the up regulation period;

[0123] The transmission power constraints of the distribution station area at each moment include: a maximum load rate constraint of the distribution station area, a maximum allowable reverse transmission power constraint and a peak-to-valley difference rate constraint.

[0124] Further, when the power of the distribution station area is in a down-regulation period, the power down-regulation requirement range of the distribution station area in the down-regulation period is determined based on the actual transmission power of the distribution station area in the down-regulation period, the maximum load rate constraint of the distribution station area, the peak-to-valley rate constraint and the average transmission power of the distribution station area, specifically including:

[0125] Transmission power constraints in distribution stations based on load rate constraints:

[0126] In order to ensure the operation safety of the distribution station area, the load rate constraints should be met during operation:

[0127]

[0128] In the formula, It is the maximum permissible transmission power based on load rate constraints in the distribution station area; P is the minimum permissible transmission power of the distribution station area based on the load rate constraint; r It is the actual transmission power of the distribution station area.

[0129] Transmission power constraints in distribution stations based on power feedback constraints:

[0130] Considering the absorption and operation safety of reverse transmission power, the reverse transmission power flow should meet the maximum allowable reverse transmission power constraint:

[0131]

[0132] In the formula, P is the maximum allowable reverse power of the distribution station area; r Indicates the actual transmission power of the distribution station area.

[0133] Transmission power constraints in distribution stations based on peak-valley rate constraints:

[0134] The average forward power purchase power of each load point in the distribution substation is superimposed to obtain the average transmission power P0 of the distribution substation, and the power deviation rate of the distribution substation is calculated according to the allowable peak-to-valley difference rate λ of the distribution substation. Then the transmission power constraint of the distribution station area based on the peak-to-valley difference rate is obtained:

[0135] P0(1-δ)≤P r ≤P0(1+δ);

[0136] Where P0 is the average transmission power of the distribution station area; P r Represents the actual transmission power of the distribution station area; P0(1-δ) is the minimum allowable transmission power based on the peak-to-valley rate constraint; P0(1+δ) is the maximum allowable transmission power based on the peak-to-valley rate constraint.

[0137] During the power reduction period of the distribution station area, the minimum power reduction demand at each moment is the positive difference between the load power of the distribution station area at that moment and the upper limit of the transmission power constraint; during the power increase period, the minimum power increase demand is the positive difference between the lower limit of the area transmission power constraint and the load power at that moment.

[0138] Transmission power P in the distribution area r The upper limit of the transmission constraint of (t) is and P0(1+δ), the lower limit is P0(1-δ), and The larger of the two, the minimum downward and upward power requirements of the distribution station area are:

[0139]

[0140] In the formula, is the minimum down-regulated power requirement of the distribution area at time a, P r (a) is the actual transmission power of the distribution area at time a, P0 is the average transmission power of the distribution area, P0(1+δ) is the maximum allowable transmission power based on the peak-to-valley rate constraint, It is the maximum allowable transmission power in the distribution station area based on the load rate constraint.

[0141]

[0142] In the formula, is the minimum power increase requirement of the distribution area at time b, P0 is the average transmission power of the distribution area, P r (b) is the actual transmission power of the distribution station area at time b, P0(1-δ) is the minimum allowable transmission power based on the peak-to-valley rate constraint, is the maximum allowable reverse power of the distribution station area, It is the minimum allowed transmission power of the distribution station area based on the load rate constraint.

[0143] Further, when the power of the distribution station area is in the increase period, the power increase requirement range of the distribution station area during the increase period is determined based on the actual transmission power of the distribution station area during the increase period, the maximum load rate constraint of the distribution station area, the maximum allowable reverse power constraint, the peak-to-valley difference rate constraint and the average transmission power of the distribution station area, specifically including:

[0144] Considering increasing the load factor of the distribution station area, it is allowed to adjust the transmission power to the average power. During the power reduction period of the distribution station area, the maximum power reduction demand at each moment is taken as the positive difference between the load power of the distribution station area at that moment and the average transmission power; during the power increase period, the maximum power increase demand is taken as the positive difference between the average transmission power of the area and the load power at that moment.

[0145]

[0146] In the formula, is the maximum feasible value of power reduction in the distribution area at time a, P r (a) is the actual transmission power of the distribution station area at time a, and P0 is the average transmission power of the distribution station area.

[0147]

[0148] In the formula, is the maximum feasible value of the power increase in the distribution area at time b, P0 is the average transmission power of the distribution area, and P r (b) is the actual transmission power of the distribution station area at time b.

[0149] Determine the power regulation demand range of the power distribution area at each moment according to the power down regulation demand range of the power distribution area during the down regulation period and the power up regulation demand range of the power distribution area during the up regulation period;

[0150] The transmission power constraints of the distribution station area at each moment include: a maximum load rate constraint of the distribution station area, a maximum allowable reverse transmission power constraint and a peak-to-valley difference rate constraint.

[0151] In step 2, the flexible load demand response probability at the demand response time is determined based on the compensation electricity price and the flexible load response probability limit, specifically including:

[0152] The greater the control demand of the distribution station area and the smaller the flexible load control capacity, the more the distribution station area needs to fully tap the potential of flexible load control by setting a higher compensation electricity price and guide more demand response loads to participate in the control. Therefore, a piecewise function can be used to establish the relationship between the demand response probability of flexible loads at the time of demand response and the compensation electricity price of the distribution station area, such as Figure 3 As shown:

[0153]

[0154] In the formula, k t，i is the demand response probability of flexible load i at time t; k max，t，i , k min，t，i are the maximum and minimum demand response probabilities of flexible load i at time t; C max,i , C min，i are the maximum compensation price and minimum compensation price of the flexible load i in the distribution station area respectively; C bc，t，i is the actual compensation electricity price for flexible load i in the distribution station area at time t, which is determined by factors such as load type, response power, response speed and time-of-use electricity price of flexible load i.

[0155] In step 3, the flexible load regulation potential range at each moment in the distribution station area is calculated based on the flexible load demand response probability at the demand response moment and the maximum regulation potential of the flexible load, specifically including:

[0156] The maximum power reduction and maximum power increase of the flexible load at each moment are called the power reduction potential and increase potential of the flexible load at that moment. Considering the demand response probability of the flexible load, the actual total power reduction and increase potential of the flexible load in the distribution station area at each moment is:

[0157]

[0158] In the formula, ΔP down (t) is the total potential amount of flexible load reduction at time t; ΔP down，i (t) is the maximum downward adjustment potential of flexible load i at time t; k t，iis the demand response probability of flexible load i at time t; D down It is a set of load points whose internal power can be adjusted down for the distribution station area.

[0159]

[0160] In the formula, ΔP up (t) is the total potential of flexible load upward adjustment at time t; ΔP up,j (t) is the maximum upward adjustment potential of flexible load j at time t; D up It is a set of load points that can adjust the internal power of the distribution station area.

[0161] Among them, the total potential amount of flexible load reduction ΔP at time t is down (t), at t x Load regulation potential P that can be interrupted at any time IL (t x ), adjustable load (reduction) regulation potential P AL (t x ), time-shiftable load (removal) regulation potential P TL (t x ) is t x The maximum power reduction potential of the flexible load in the distribution station area at the moment is calculated. The maximum power reduction potential curve of the day ΔP can be obtained by calculating the total power reduction potential of the flexible load at each moment of the day. down (t), the power reduction potential range at each moment is [0, ΔP down (t)].

[0162] The total potential increase of flexible load ΔP at time t up (t), at t s Adjustable load increase potential P at any time AL (t s ), time-shiftable load transfer into regulation potential P TL (t s ) is t s The maximum total power increase potential of the flexible load in the distribution station area at the moment, and the power increase potential of the flexible load at each moment throughout the day can be calculated to obtain the daily maximum power increase potential curve ΔP up (t), the power increase potential range at each moment is [0, ΔP up (t)].

[0163] The construction of the distribution station area regulation cost-benefit model involved in the present invention includes:

[0164] Construct an objective function with the goal of maximizing the regulation benefit within a set period of time;

[0165] Setting constraints for the objective function; the constraints include power distribution station area benefit constraints and flexible load regulation potential constraints;

[0166] A distribution station area regulation cost-benefit model is constructed based on the objective function, the distribution station area benefit constraint condition and the flexible load regulation potential constraint condition.

[0167] Furthermore, an objective function is constructed with the goal of maximizing the regulation benefit within a set period of time, specifically including:

[0168] The operating cost of the distribution station area in the set period before regulation is calculated based on the environmental value of carbon dioxide before regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the purchased and sold electricity power of the distribution station area, and the purchased and sold electricity cost per unit of power in the distribution station area;

[0169] The operating cost of the distribution station area within the set period after regulation is calculated based on the environmental value of carbon dioxide after regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the power purchase and sale of the distribution station area, the power purchase and sale cost per unit of power in the distribution station area, the compensation cost of the regulated power, and the regulated power value of the distribution station area;

[0170] An objective function for maximizing regulation benefits within a set period of time is constructed by using the maximum value of the difference between the operating cost within a set period of time before the distribution station area is regulated and the operating cost within a set period of time after the distribution station area is regulated.

[0171] The distribution station area uses the load regulation amount at each moment as the decision variable and the daily regulation income f net The maximum is the optimization target, and the low-carbon economic operation of the distribution station area is realized. The objective function is:

[0172]

[0173] In the formula, f net To regulate the revenue of the distribution area on a daily basis; They are the daily operating costs before and after the regulation of the distribution station area.

[0174]

[0175] In the formula, ξ elec is the daily electricity purchase and sales cost of the distribution station area, ξ shape To regulate compensation costs, carbon is the carbon emission cost, ω t，0 is the electricity purchase cost per unit power in the distribution area at time t, ω t，1 P is the electricity sales cost per unit power in the distribution area at time t, t，0 is the purchased power of the distribution station area at time t, P t，1 is the power sold in the distribution area at time t, μ tP is the compensation cost of the unit control power in the distribution station area at time t, need，t is the control power value of the distribution area at time t, T is the control time set, C emi is the unit environmental value of CO2, e is the CO2 emission generated by the unit electricity provided by the distribution station area, To control the previous day's operating costs for the distribution area, To calculate the daily operating costs after the distribution station area is regulated. is the daily electricity purchase and sales cost of the distribution station area before regulation, is the carbon emission cost before regulation, The daily electricity purchase and sales cost of the distribution area after regulation; To compensate for the cost of regulation after regulation, is the carbon emission cost after regulation.

[0176] Furthermore, constraints are set for the objective function; the constraints include power distribution area benefit constraints and flexible load regulation potential constraints, specifically including:

[0177] The constraints are as follows:

[0178] Distribution area efficiency constraints:

[0179] In order to stimulate the willingness to regulate the distribution area, the benefits of the distribution area need to meet the following constraints:

[0180]

[0181] Where ρ0 is the minimum benefit growth coefficient of the distribution station area, f net To control the daily revenue of the distribution station area, Regulate the previous day's operating costs for distribution stations.

[0182] Flexible load regulation potential constraints:

[0183] When the control power of each flexible load is less than or equal to its control potential, the flexible load accepts the control demand signal of the distribution station area; otherwise, the flexible load refuses to accept the control demand signal of the distribution station area.

[0184] P adjust，down，i，t ≤k t，i ΔP down,i (t);

[0185] Where P adjust，down，i，t is the reduced power of flexible load i at time t; k t，i is the demand response probability of flexible load i at time t; ΔP down，i (t) is the maximum downward adjustment potential of flexible load i at time t.

[0186] P adjust，up，j，t ≤kt，j ΔP up，j (t);

[0187] Where P adjust，up，j，t is the increased power of flexible load j at time t, k t，j is the demand response probability of flexible load j at time t, ΔP up，j (t) is the maximum upward adjustment potential of flexible load j at time t.

[0188] A distribution station area regulation cost-benefit model is constructed based on the objective function, the distribution station area benefit constraint and the flexible load regulation potential constraint.

[0189] In this embodiment, the load regulation power of the distribution station area at each moment is determined with the goal of maximizing the regulation benefit through the distribution station area regulation cost-benefit analysis model, thereby achieving the optimal benefit of the distribution station area.

[0190] In step 4, the load regulation power of the distribution substation at each moment is obtained based on the power regulation demand range of the distribution substation at each moment and the flexible load regulation potential range of the distribution substation at each moment in combination with the pre-constructed distribution substation regulation cost-benefit model, specifically including:

[0191] This embodiment takes the abnormal data of the power load curve of the distribution station area as an example. Figure 4 As shown in the figure, the coordination between the control demand range of the distribution station area and the flexible load control potential range of the distribution station area is considered to effectively reduce the solution space of the cost-benefit model of the distribution station area. Combined with the pre-constructed cost-benefit model of the operation and control of the distribution station area, the adjustable power of the distribution station area at each moment is optimized while satisfying the benefit constraints and control potential constraints of the distribution station area. By optimizing the objective function, the load regulation power of the distribution station area at each moment is obtained to maximize the benefits.

[0192] Furthermore, based on the carbon emission range, the power regulation demand range of the distribution station area is corrected, including:

[0193] Based on the carbon emission range, the fuzzy C-means clustering algorithm is used to divide carbon emissions into peak period, middle period and valley period.

[0194] When carbon emissions are at their peak, if the power demand in the distribution station area is in a period of power reduction or does not require regulation, the power demand will be reduced; otherwise, during the period of power increase in the distribution station area, the power demand will be increased to the minimum value of the power increase demand range;

[0195] When carbon emissions are in the middle period, no correction will be made to the power reduction period of the power distribution area, the power increase period of the power distribution area, and the power distribution area power that does not need to be regulated;

[0196] When carbon emissions are at a low point, the power demand of the power distribution area during the period of power reduction or increase will be corrected, and the power demand of the power distribution area during the period when no regulation is required will not be corrected;

[0197] The regulation period of the power distribution area includes: a period without regulation;

[0198] The period of time that does not require regulation is determined based on the time corresponding to the power that does not require regulation of the distribution network.

[0199] Furthermore, based on the carbon emission range, the fuzzy C-means clustering algorithm is used to divide carbon emissions into peak period, middle period and valley period, including:

[0200] According to the access point of the distribution station area, taking the grid connection point on the 10kV line as an example, the carbon emission factor curve is divided into carbon emission peak period, middle period and valley period by using fuzzy C-means clustering algorithm.

[0201] The carbon emission factor curve mentioned in this embodiment may be a carbon emission range.

[0202] Furthermore, when carbon emissions are at their peak, if the power demand in the distribution area is in a period of power reduction or does not require regulation, the power demand is reduced; otherwise, during the period of power increase in the distribution area, the power demand is increased to the minimum value of the power increase demand range, including:

[0203] Carbon emissions are at their peak:

[0204] When the distribution station area is in the power reduction period, the power is reduced and the maximum feasible value of the reduced power is corrected to:

[0205]

[0206] In the formula, is the maximum feasible value of power reduction in the distribution station area at time a after correction, It is the minimum permissible transmission power in the distribution area based on the load rate constraint; is the maximum allowable reverse power of the distribution station area; P0(1-δ) is the minimum allowable transmission power based on the peak-to-valley rate constraint; P r (a) is the actual transmission power of the distribution station area at time a.

[0207] When the distribution station area is in a period where no regulation is required, the power is reduced and the maximum feasible value of the reduced power is corrected to:

[0208]

[0209] In the formula, is the maximum feasible value of power reduction in the distribution area at time c after correction; P r(c) is the actual transmission power of the distribution station area at time c; is the minimum allowable reverse power in the distribution station area; P0(1-δ) is the minimum allowable transmission power based on the peak-to-valley rate constraint.

[0210] When the power distribution area is in the power increase period, the power increase demand in this period is corrected to the minimum value of the power increase demand range.

[0211] Furthermore, when carbon emissions are in the middle period, the power reduction period of the power distribution area, the power increase period of the power distribution area, and the power distribution area power without regulation period will not be corrected, including:

[0212] Carbon emissions are in the middle period:

[0213] When the distribution station area is in the power reduction period, power increase period and no regulation period, the regulation demand will not be corrected;

[0214] Furthermore, when carbon emissions are at a low point, the power demand of the power distribution area during the period of power reduction or increase is corrected, and the power demand of the power distribution area during the period when the power does not need to be adjusted is not corrected, including:

[0215] When the power of the distribution station area is in the period of power reduction, the power demand is reduced to the minimum value of the power reduction demand range;

[0216] When the power of the distribution station area is in the increase period, increase the power.

[0217] Furthermore, when the power of the distribution station area is in the down-regulation period, the power demand is down-regulated to the minimum value of the power down-regulation demand range, specifically including:

[0218] Carbon emissions are at a low point:

[0219] When the power distribution area is in the power reduction period, the power reduction demand in this period is corrected to the minimum value of the power reduction demand range.

[0220] If the distribution station area is in a period where no regulation is required, the power demand will not be corrected.

[0221] When the power distribution area is in the power increase period, the power is increased and the maximum feasible value of the increased power is corrected to:

[0222]

[0223] In the formula, The minimum feasible value for the power increase in the distribution station area at time b after correction; is the maximum permissible transmission power of the distribution station area based on the load rate constraint; P0(1+δ) is the maximum permissible transmission power based on the peak-to-valley rate constraint; P r (b) is the actual transmission power of the distribution station area at time b.

[0224] This embodiment takes air conditioning load as an example to further introduce flexible load. According to the weather forecast of the temperature in the previous 24 hours, based on the similar day clustering method, the date of temperature control load demand response capacity is selected and calculated, which is set as the mth day and The historical typical daily temperature change curves of N dates with similar shapes that are closest to each other.

[0225] The relationship between the temperature control load output and the ambient temperature at each time in each historical typical day is fitted by the least squares method. After fitting, the relationship between the temperature control load output and the temperature at different times in the historical typical day i can be obtained. By calculating the weighted average value, we can obtain the relationship between the temperature control load output and temperature at different times on the mth day, as shown in the following formula:

[0226]

[0227] In the formula, k i is the similarity between the temperature change curve of the i-th historical typical day and the temperature change curve of the m-th day; is the relationship between temperature control load output and temperature at different times on a typical historical day i; N is the date; It is the relationship between temperature control load output and temperature.

[0228] When the total amount of flexible load regulation potential is less than the minimum regulation demand, the distribution station area can appropriately reduce the regulation demand to within the total amount of flexible load regulation potential, which can achieve economic operation to a certain extent.

[0229] Embodiment 2:

[0230] Based on the same inventive concept, the present invention also provides a distribution substation operation system considering flexible load regulation, such as Figure 5 As shown, it includes: a demand range determination module, an acquisition probability module, a potential range determination module, and a power calculation module;

[0231] A demand range determination module is used to evaluate the power control demand range of the distribution station area at each moment based on the transmission power constraints of the distribution station area at each moment;

[0232] An acquisition probability module is used to determine the flexible load demand response probability at the demand response time based on the compensation electricity price and the flexible load response probability limit;

[0233] A potential range determination module, used to calculate the flexible load regulation potential range at each moment in the distribution station area based on the flexible load demand response probability at the demand response moment and the maximum regulation potential of the flexible load;

[0234] A power calculation module, used to obtain the load regulation power of the distribution station area at each moment based on the power regulation demand range of the distribution station area at each moment and the flexible load regulation potential range of the distribution station area at each moment in combination with a pre-constructed distribution station area regulation cost-benefit model;

[0235] Among them, the distribution substation area control cost-benefit model in the power calculation module is constructed by the distribution substation area control cost-benefit model construction module; the distribution substation area control cost-benefit model in the distribution substation area control cost-benefit model construction module is constructed based on the objective function and the distribution substation area benefit constraints and flexible load control potential constraints.

[0236] The requirements scoping module includes:

[0237] The time period determination submodule is used to determine the regulation period of the power of the distribution station area based on the power of the distribution station area at each moment and the load rate and peak-to-valley difference limit of the distribution station area;

[0238] The control range submodule is used to determine the power control requirement range of the distribution station area at each moment based on the average transmission power of the distribution station area in each adjustment period, the actual transmission power and the transmission power constraint at each moment in each adjustment period.

[0239] Furthermore, the time period determination submodule is specifically used for:

[0240] Considering the maximum load rate constraint, the maximum allowable reverse power constraint and the peak-valley difference rate constraint, the upper and lower limits of the transmission power constraint are calculated to take into account the operation safety of the distribution station area and carbon reduction and emission reduction. If the load power of the distribution station area exceeds the limit, it must be regulated. The period when the load rate and the peak-valley difference of the distribution station area exceed the upper limit is the power reduction period, and the period when the load rate and the peak-valley difference of the distribution station area exceed the lower limit is the power increase period.

[0241] Furthermore, the control range submodule is specifically used for:

[0242] The transmission power constraints at each time in the distribution area mentioned in this embodiment include: the maximum load rate constraint of the distribution area, the maximum allowable reverse transmission power constraint and the peak-to-valley difference rate constraint, which are described in detail as follows:

[0243] Transmission power constraints in distribution stations based on load rate constraints:

[0244] In order to ensure the operation safety of the distribution station area, the load rate constraints should be met during operation:

[0245]

[0246] In the formula, It is the maximum permissible transmission power based on load rate constraints in the distribution station area; P is the minimum permissible transmission power of the distribution station area based on the load rate constraint; r It is the actual transmission power of the distribution station area.

[0247] Transmission power constraints in distribution stations based on power feedback constraints:

[0248] Considering the absorption and operation safety of reverse transmission power, the reverse transmission power flow should meet the maximum allowable reverse transmission power constraint:

[0249]

[0250] In the formula, P is the maximum allowable reverse power of the distribution station area; r Indicates the actual transmission power of the distribution station area.

[0251] Transmission power constraints in distribution stations based on peak-valley rate constraints:

[0252] The average forward power purchase power of each load point in the distribution substation is superimposed to obtain the average transmission power P0 of the distribution substation, and the power deviation rate of the distribution substation is calculated according to the allowable peak-to-valley difference rate λ of the distribution substation. Then the transmission power constraint of the distribution station area based on the peak-to-valley difference rate is obtained:

[0253] P0(1-δ)≤P r ≤P0(1+δ);

[0254] Where P0 is the average transmission power of the distribution station area; P r Represents the actual transmission power of the distribution station area; P0(1-δ) is the minimum allowable transmission power based on the peak-to-valley rate constraint; P0(1+δ) is the maximum allowable transmission power based on the peak-to-valley rate constraint.

[0255] During the power reduction period of the distribution station area, the minimum power reduction demand at each moment is the positive difference between the load power of the distribution station area at that moment and the upper limit of the transmission power constraint; during the power increase period, the minimum power increase demand is the positive difference between the lower limit of the area transmission power constraint and the load power at that moment.

[0256] Transmission power P in the distribution area r The upper limit of the transmission constraint of (t) is and P0(1+δ), the lower limit is P0(1-δ), and The larger of the two, the minimum downward and upward power requirements of the distribution station area are:

[0257]

[0258] In the formula, is the minimum down-regulated power requirement of the distribution area at time a, P r (a) is the actual transmission power of the distribution area at time a, P0 is the average transmission power of the distribution area, P0(1+δ) is the maximum allowable transmission power based on the peak-to-valley rate constraint, It is the maximum allowable transmission power in the distribution station area based on the load rate constraint.

[0259]

[0260] In the formula, is the minimum power increase requirement of the distribution area at time b, P0 is the average transmission power of the distribution area, P r (b) is the actual transmission power of the distribution station area at time b, P0(1-δ) is the minimum allowable transmission power based on the peak-to-valley rate constraint, is the maximum allowable reverse power of the distribution station area, It is the minimum allowed transmission power of the distribution station area based on the load rate constraint.

[0261] Considering increasing the load factor of the distribution station area, it is allowed to adjust the transmission power to the average power. During the power reduction period of the distribution station area, the maximum power reduction demand at each moment is taken as the positive difference between the load power of the distribution station area at that moment and the average transmission power; during the power increase period, the maximum power increase demand is taken as the positive difference between the average transmission power of the area and the load power at that moment.

[0262]

[0263] In the formula, is the maximum feasible value of power reduction in the distribution area at time a, P r (a) is the actual transmission power of the distribution station area at time a, and P0 is the average transmission power of the distribution station area.

[0264]

[0265] In the formula, is the maximum feasible value of the power increase in the distribution area at time b, P0 is the average transmission power of the distribution area, and P r (b) is the actual transmission power of the distribution station area at time b.

[0266] The acquisition probability module is specifically used for:

[0267] The greater the control demand of the distribution station area and the smaller the flexible load control capacity, the more the distribution station area needs to fully tap the potential of flexible load control by setting a higher compensation electricity price and guide more demand response loads to participate in the control. Therefore, a piecewise function can be used to establish the relationship between the demand response probability of flexible loads at the time of demand response and the compensation electricity price of the distribution station area:

[0268]

[0269] In the formula, k t，i is the demand response probability of flexible load i at time t; k max，tni , k min，t,i are the maximum and minimum demand response probabilities of flexible load i at time t; C max，i , C min，i are the maximum compensation price and minimum compensation price of the flexible load i in the distribution station area respectively; C bc,t,i is the actual compensation electricity price for flexible load i in the distribution station area at time t, which is determined by factors such as load type, response power, response speed and time-of-use electricity price of flexible load i.

[0270] The potential range determination module is specifically used to:

[0271] The maximum power reduction and maximum power increase of the flexible load at each moment are called the power reduction potential and increase potential of the flexible load at that moment. Considering the demand response probability of the flexible load, the actual total power reduction and increase potential of the flexible load in the distribution station area at each moment is:

[0272]

[0273] In the formula, ΔP down (t) is the total potential amount of flexible load reduction at time t; ΔP down，i (t) is the maximum downward adjustment potential of flexible load i at time t; k t，i is the demand response probability of flexible load i at time t; D down It is a set of load points whose internal power can be adjusted down for the distribution station area.

[0274]

[0275] In the formula, ΔP up (t) is the total potential of flexible load upward adjustment at time t; ΔP up，j (t) is the maximum upward adjustment potential of flexible load j at time t; D up k is the set of load points within the distribution station area where power can be increased; t，j is the demand response probability of flexible load j at time t.

[0276] Among them, the total potential amount of flexible load reduction ΔP at time t is down(t), at t x Load regulation potential P that can be interrupted at any time IL (t x ), adjustable load (reduction) regulation potential P AL (t x ), time-shiftable load (removal) regulation potential P TL (t x ) is t x The maximum power reduction potential of the flexible load in the distribution station area at the moment is calculated. The maximum power reduction potential curve of the day ΔP can be obtained by calculating the total power reduction potential of the flexible load at each moment of the day. down (t), the power reduction potential range at each moment is [0, ΔP down (t)].

[0277] The total potential increase of flexible load ΔP at time t up (t), at t s Adjustable load increase potential P at any time AL (t s ), time-shiftable load transfer into regulation potential P TL (t s ) is t s The maximum total power increase potential of the flexible load in the distribution station area at the moment, and the power increase potential of the flexible load at each moment throughout the day can be calculated to obtain the daily maximum power increase potential curve ΔP up (t), the power increase potential range at each moment is [0, ΔP up (t)].

[0278] Specifically, the modules for constructing the cost-benefit model of distribution substation area regulation include:

[0279] The objective function construction submodule is used to construct the objective function with the goal of maximizing the regulation benefit within a set period of time;

[0280] A constraint construction submodule is used to set constraint conditions for the objective function; the constraint conditions include power distribution area benefit constraint conditions and flexible load regulation potential constraint conditions;

[0281] The model building submodule is used to build a distribution network area regulation cost-benefit model based on the objective function, the distribution network area benefit constraint condition and the flexible load regulation potential constraint condition.

[0282] Furthermore, the objective function construction submodule is specifically used for:

[0283] The distribution station area uses the load regulation amount at each moment as the decision variable and the daily regulation income f net The maximum is the optimization target, and the low-carbon economic operation of the distribution station area is realized. The objective function is:

[0284]

[0285] In the formula, f net To regulate the revenue of the distribution area on a daily basis; They are the daily operating costs before and after the regulation of the distribution station area.

[0286]

[0287] In the formula, ξ elec is the daily electricity purchase and sales cost of the distribution station area, ξ shape To regulate compensation costs, carbon is the carbon emission cost, ω t，0 is the electricity purchase cost per unit power in the distribution area at time t, ω t，1 P is the electricity sales cost per unit power in the distribution area at time t, t，0 is the purchased power of the distribution station area at time t, P t，1 is the power sold in the distribution area at time t, μ t P is the compensation cost of the unit control power in the distribution station area at time t, need，t is the control power value of the distribution area at time t, T is the control time set, C emi is the unit environmental value of CO2, e is the CO2 emission generated by the unit electricity provided by the distribution station area, is the daily electricity purchase and sales cost of the distribution station area before regulation, is the carbon emission cost before regulation, The daily electricity purchase and sales cost of the distribution area after regulation; To compensate for the cost of regulation after regulation, is the carbon emission cost after regulation, They are the daily operating costs before and after the regulation of the distribution station area.

[0288] Furthermore, the constraint construction submodule is specifically used for:

[0289] Distribution area efficiency constraints:

[0290] In order to stimulate the willingness to regulate the distribution area, the benefits of the distribution area need to meet the following constraints:

[0291]

[0292] Where ρ0 is the minimum benefit growth coefficient of the distribution station area, f net To control the daily revenue of the distribution station area, Regulate the previous day's operating costs for distribution stations.

[0293] Flexible load regulation potential constraints:

[0294] When the control power of each flexible load is less than or equal to its control potential, the flexible load accepts the control demand signal of the distribution station area; otherwise, the flexible load refuses to accept the control demand signal of the distribution station area.

[0295] P adjust，down，i，t ≤k t，i ΔP down，i (t);

[0296] Where P adjust，down，i，t is the reduced power of flexible load i at time t; k t，i is the demand response probability of flexible load i at time t; ΔP down，i (t) is the maximum downward adjustment potential of flexible load i at time t.

[0297] P adjust，up，j，t ≤k t，j ΔP up，j (t);

[0298] Where P adjust，up，j，t is the increased power of flexible load j at time t, k t，j is the demand response probability of flexible load j at time t, ΔP up，j (t) is the maximum upward adjustment potential of flexible load j at time t.

[0299] The model building submodule is specifically used for:

[0300] A distribution station area regulation cost-benefit model is constructed based on the objective function, the distribution station area benefit constraint and the flexible load regulation potential constraint.

[0301] A distribution station area operation system considering flexible load regulation provided by the present invention also includes a correction module;

[0302] The correction module is used to:

[0303] According to the access point of the distribution station area, taking the grid connection point on the 10kV line as an example, the carbon emission factor curve is divided into the peak period, middle period and valley period of carbon emission using the fuzzy C-means clustering algorithm. (1) Carbon emission is at the peak period:

[0304] When the distribution station area is in the power reduction period, the power is reduced and the maximum feasible value of the reduced power is corrected to:

[0305]

[0306] In the formula, is the maximum feasible value of power reduction in the distribution station area at time a after correction, It is the minimum permissible transmission power in the distribution area based on the load rate constraint; is the maximum allowable reverse power of the distribution station area; P0(1-δ) is the minimum allowable transmission power based on the peak-to-valley rate constraint; P r (a) is the actual transmission power of the distribution station area at time a.

[0307] When the distribution station area is in a period where no regulation is required, the power is reduced and the maximum feasible value of the reduced power is corrected to:

[0308]

[0309] In the formula, is the maximum feasible value of power reduction in the distribution area at time c after correction; P r (c) is the actual transmission power of the distribution station area at time c; is the minimum allowable reverse power in the distribution station area; P0(1-δ) is the minimum allowable transmission power based on the peak-to-valley rate constraint.

[0310] When the power distribution area is in the power increase period, the power increase demand during this period is corrected to the minimum value of the power increase demand range.

[0311] (2) Carbon emissions are in the intermediate period:

[0312] When the distribution station area is in the power reduction period, power increase period and no regulation period, the regulation demand will not be corrected;

[0313] (3) Carbon emissions are at a low point:

[0314] When the power distribution area is in the power reduction period, the power reduction demand during this period is corrected to the minimum value of the power reduction demand range.

[0315] When the power distribution area is in the power increase period, the power is increased and the maximum feasible value of the increased power is corrected to:

[0316]

[0317] In the formula, The minimum feasible value for the power increase in the distribution station area at time b after correction; is the maximum permissible transmission power of the distribution station area based on the load rate constraint; P0(1+δ) is the maximum permissible transmission power based on the peak-to-valley rate constraint; P r (b) is the actual transmission power of the distribution station area at time b;

[0318] When the distribution station area is in a period where no regulation is required, the power demand will not be corrected.

[0319] Embodiment 3:

[0320] This embodiment takes a rural agricultural park in northern China as an example, selects a typical day of a scenario, and further introduces a distribution station area operation method considering flexible load regulation. It is assumed that the scheduling is once every hour and the scheduling cycle is 24 hours. The typical daily power curve of the agricultural park is as follows: Figure 6 As shown in Figure 7 As shown in Figure 2, the carbon emission factor curve is as follows: Figure 8 As shown, the peak-to-valley difference rate of the distribution station area load curve after regulation is required to be no more than 50%. According to the national CO2 emission intensity and relevant carbon tax standards, the unit environmental value of CO2 is 0.01 yuan / (kW·h), and the distribution station area regulation compensation electricity price ranges from 0.3 to 1.2 yuan / (kW·h).

[0321] In order to verify the effectiveness of the low-carbon economic operation method of the distribution station area considering the potential of flexible load regulation established in this paper, the operation cost of the distribution station area before and after the typical day regulation was obtained by solving the model, as shown in Table 1. Fig. 9 The comparison results of the electric load curve after optimization operation according to the method proposed in this paper and the electric load curve of the distribution station area before regulation are shown in the figure.

[0322] Table 1 Typical daily operating costs of distribution station areas (unit: yuan)

[0323]

[0324] It can be seen that after considering the optimization of the flexible load regulation potential, the daily operating cost of the distribution station area is reduced by 93 yuan, the carbon emission cost is reduced by 2 yuan, and the load peak-to-valley difference rate is reduced by 17.9%, achieving economic and low-carbon operation. Due to the flexible and adjustable characteristics of flexible loads, the low-carbon economic operation optimization of the distribution station area can be achieved by fully considering the flexible load demand response potential. By using the power regulation potential of flexible loads to increase or decrease the power of the distribution station area at each moment, the daily load curve of the distribution station area can be smoothed, thereby achieving the purpose of increasing the load rate of the distribution station area and reducing the peak-to-valley difference rate.

[0325] Embodiment 4:

[0326] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of a distribution station area operation method considering flexible load regulation in the above embodiment.

[0327] Embodiment 5:

[0328] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of a distribution station area operation method considering flexible load regulation in the above embodiment.

[0329] Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0330] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0331] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0332] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0333] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0334] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A distribution station area operation method considering flexible load regulation, characterized in that ,include: Evaluate the power control demand range of the distribution station area at each moment based on the transmission power constraints of the distribution station area at each moment; Determine the flexible load demand response probability at the demand response time based on the compensation electricity price and the flexible load response probability limit; Calculate the flexible load regulation potential range at each moment in the distribution station area based on the flexible load demand response probability at the demand response moment and the maximum regulation potential of the flexible load; Based on the power regulation demand range of the power distribution area at each moment and the flexible load regulation potential range of the power distribution area at each moment, combined with the pre-constructed power distribution area regulation cost-benefit model, the load regulation power of the power distribution area at each moment is obtained; The distribution substation area regulation cost-benefit model is constructed by considering the distribution substation area regulation demand and flexible load regulation potential, with the goal of maximizing regulation benefits and combining constraints.

2. The method according to claim 1, characterized in that The power control requirement range of the distribution station area at each moment is evaluated based on the transmission power constraint of the distribution station area at each moment, including: Determine the regulation period of the power of the distribution station area based on the power of the distribution station area at each moment and the limit of the load rate and peak-to-valley difference of the distribution station area; The power regulation demand range of the distribution station area at each moment is determined based on the average transmission power of the distribution station area in each regulation period, the actual transmission power and the transmission power constraint at each moment in each regulation period.

3. The method according to claim 2, characterized in that The regulation period of the power of the distribution station area includes: an upward regulation period and a downward regulation period; The upward adjustment period is determined based on the power of the distribution network at each moment and the load rate of the distribution station area and the lower limit of the peak-to-valley difference; The downward adjustment period is determined based on the power of the distribution network at each moment and the load rate of the distribution station area and the upper limit of the peak-to-valley difference.

4. The method according to claim 2, characterized in that The determining of the power regulation requirement range of the distribution station area at each moment based on the transmission power average value of the distribution station area in each regulation period, the actual transmission power and the transmission power constraint at each moment in each regulation period includes: When the power of the distribution station area is in a down-regulation period, the power down-regulation requirement range of the distribution station area in the down-regulation period is determined based on the actual transmission power of the distribution station area in the down-regulation period, the maximum load rate constraint of the distribution station area, the peak-to-valley rate constraint and the average transmission power of the distribution station area; When the power of the distribution station area is in the period of increase, the power increase requirement range of the distribution station area in the period of increase is determined based on the actual transmission power of the distribution station area in the period of increase, the maximum load rate constraint of the distribution station area, the maximum allowable reverse power constraint, the peak-to-valley difference rate constraint and the average transmission power of the distribution station area; Determine the power regulation demand range of the power distribution area at each moment according to the power down regulation demand range of the power distribution area during the down regulation period and the power up regulation demand range of the power distribution area during the up regulation period; The transmission power constraints of the distribution station area at each moment include: a maximum load rate constraint of the distribution station area, a maximum allowable reverse transmission power constraint and a peak-to-valley difference rate constraint.

5. The method according to claim 1, characterized in that The probability of flexible load demand response at the demand response time is calculated as follows: In the formula, κ t,i is the demand response probability of flexible load i at time t; κ max,t,i is the maximum demand response probability of flexible load i at time t; κ min,t,i is the minimum demand response probability of flexible load i at time t; c max,i is the maximum compensation price for flexible load i in the distribution area; c min,i is the minimum compensation price for flexible load i in the distribution area; c bc,t,i is the actual compensation electricity price for flexible load i in the distribution station area at time t; t is the time; i is the flexible load at the time of downward adjustment.

6. The method according to claim 1, characterized in that The flexible load regulation potential range of the distribution station area at each moment is determined by the total flexible load downward adjustment potential and the total flexible load upward adjustment potential, which is calculated as follows: Where ΔP down (t) is the total potential amount of flexible load reduction at time t; ΔP up (t) is the total potential of flexible load upward adjustment at time t; ΔP down,i (t) is the maximum downward adjustment potential of flexible load i at time t; ΔP up,j (t) is the maximum upward adjustment potential of flexible load j at time t; D down D is the set of load points within the distribution station area that can adjust power downward; up is the set of load points with power increase within the distribution station area; κ t,i is the demand response probability of flexible load i at time t; t is the time; i is the flexible load when it is down-regulated; j is the flexible load when it is up-regulated; κ t,j is the demand response probability of flexible load j at time t.

7. The method according to claim 1, characterized in that The construction of the distribution station area regulation cost-benefit model includes: Construct an objective function with the goal of maximizing the regulation benefit within a set period of time; and setting constraints for the objective function; the constraints include power distribution area benefit constraints and flexible load regulation potential constraints; A distribution station area regulation cost-benefit model is constructed based on the objective function, the distribution station area benefit constraint condition and the flexible load regulation potential constraint condition.

8. The method according to claim 7, characterized in that The objective function is constructed with the goal of maximizing the regulation benefit within a set period of time, including: The operating cost of the distribution station area in the set period before regulation is calculated based on the environmental value of carbon dioxide before regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the purchased and sold electricity power of the distribution station area, and the purchased and sold electricity cost per unit of power in the distribution station area; The operating cost of the distribution station area within the set period after regulation is calculated based on the environmental value of carbon dioxide after regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the power purchase and sale of the distribution station area, the power purchase and sale cost per unit of power in the distribution station area and the compensation cost of the regulated power, as well as the regulated power value of the distribution station area; An objective function for maximizing the regulation benefit within the set time period is constructed by the maximum value of the difference between the operating cost within the set time period before the distribution station area is regulated and the operating cost within the set time period after the distribution station area is regulated.

9. The method according to claim 3, characterized in that The method also includes correcting the power regulation demand range of the distribution station area based on the carbon emission range.

10. The method according to claim 9, characterized in that The method of correcting the power regulation demand range of the distribution station area based on the carbon emission interval includes: Based on the carbon emission range, the fuzzy C-means clustering algorithm is used to divide carbon emissions into peak period, middle period and valley period. When carbon emissions are at their peak, if the power demand in the distribution station area is in a period of power reduction or does not require regulation, the power demand will be reduced; otherwise, during the period of power increase in the distribution station area, the power demand will be increased to the minimum value of the power increase demand range; When carbon emissions are in the middle period, no correction will be made to the power reduction period of the power distribution area, the power increase period of the power distribution area, and the power distribution area power that does not need to be regulated; When carbon emissions are at a low point, the power demand of the power distribution area during the period of power reduction or increase will be corrected, and the power demand of the power distribution area during the period when no regulation is required will not be corrected; The regulation period of the power distribution area includes: a period without regulation; The period of time that does not require regulation is determined based on the time corresponding to the power that does not require regulation of the distribution network.

11. The method according to claim 10, characterized in that When the carbon emission is at a low point, the power demand of the power distribution area during the period of power reduction or power increase is corrected, including: When the power of the distribution station area is in the period of power reduction, the power demand is reduced to the minimum value of the power reduction demand range; When the power of the distribution station area is in the increase period, increase the power.

12. A distribution substation operation system considering flexible load regulation, characterized in that ,include: A demand range determination module is used to evaluate the power control demand range of the distribution station area at each moment based on the transmission power constraints of the distribution station area at each moment; An acquisition probability module is used to determine the flexible load demand response probability at the demand response time based on the compensation electricity price and the flexible load response probability limit; A potential range determination module, used to calculate the flexible load regulation potential range at each moment in the distribution station area based on the flexible load demand response probability at the demand response moment and the maximum regulation potential of the flexible load; A power calculation module, used to obtain the load regulation power of the distribution station area at each moment based on the power regulation demand range of the distribution station area at each moment and the flexible load regulation potential range of the distribution station area at each moment in combination with a pre-constructed distribution station area regulation cost-benefit model; The distribution substation area regulation cost-benefit model is constructed by considering the distribution substation area regulation demand and flexible load regulation potential, with the goal of maximizing regulation benefits and combining constraints.

13. The system of claim 12, wherein: The demand scope determination module includes: The time period determination submodule is used to determine the regulation period of the power of the distribution station area based on the power of the distribution station area at each moment and the load rate and peak-to-valley difference limit of the distribution station area; The control range submodule is used to determine the power control demand range of the distribution station area at each moment based on the average transmission power of the distribution station area in each adjustment period, the actual transmission power and the transmission power constraint at each moment in each adjustment period.

14. The system of claim 12, wherein: The control range submodule is specifically used for: When the power of the distribution station area is in a down-regulation period, the power down-regulation requirement range of the distribution station area in the down-regulation period is determined based on the actual transmission power of the distribution station area in the down-regulation period, the maximum load rate constraint of the distribution station area, the peak-to-valley rate constraint and the average transmission power of the distribution station area; When the power of the distribution station area is in the period of increase, the power increase requirement range of the distribution station area in the period of increase is determined based on the actual transmission power of the distribution station area in the period of increase, the maximum load rate constraint of the distribution station area, the maximum allowable reverse power constraint, the peak-to-valley difference rate constraint and the average transmission power of the distribution station area; Determine the power regulation demand range of the power distribution area at each moment according to the power down regulation demand range of the power distribution area during the down regulation period and the power up regulation demand range of the power distribution area during the up regulation period; The transmission power constraints of the distribution station area at each moment include: a maximum load rate constraint of the distribution station area, a maximum allowable reverse transmission power constraint and a peak-to-valley difference rate constraint.

15. The system of claim 12, wherein: It also includes a power distribution area regulation cost-benefit model construction module, and the power distribution area regulation cost-benefit model construction module includes: The objective function construction submodule is used to construct the objective function with the goal of maximizing the regulation benefit within a set period of time; A constraint construction submodule is used to set constraint conditions for the objective function; the constraint conditions include power distribution area benefit constraint conditions and flexible load regulation potential constraint conditions; The model building submodule is used to build a distribution network area regulation cost-benefit model based on the objective function, the distribution network area benefit constraint condition and the flexible load regulation potential constraint condition.

16. The system of claim 15, wherein: The objective function construction submodule is specifically used for: The operating cost of the distribution station area in the set period before regulation is calculated based on the environmental value of carbon dioxide before regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the purchased and sold electricity power of the distribution station area, and the purchased and sold electricity cost per unit of power in the distribution station area; The operating cost of the distribution station area within the set period after regulation is calculated based on the environmental value of carbon dioxide after regulation, the carbon dioxide emissions per unit of electricity in the distribution station area, the power purchase and sale of the distribution station area, the power purchase and sale cost per unit of power in the distribution station area and the compensation cost of the regulated power, as well as the regulated power value of the distribution station area; An objective function for maximizing the regulation benefit within the set time period is constructed by the maximum value of the difference between the operating cost within the set time period before the distribution station area is regulated and the operating cost within the set time period after the distribution station area is regulated.

17. A computer device, characterized in that: include: one or more processors; The processor is used to store one or more programs; When the one or more programs are executed by the one or more processors, a distribution station area operation method considering flexible load regulation as described in any one of claims 1 to 11 is implemented.

18. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, a distribution station area operation method considering flexible load regulation as described in any one of claims 1 to 11 is implemented.

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