CN110555606A - method for improving DG consumption level of power distribution network based on total amount - Google Patents
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Abstract
the invention discloses a method for improving DG consumption level of a power distribution network based on total amount, which comprises the steps of calculating to obtain a feeder load rate according to data of the power distribution network; calculating the comprehensive matching degree and the comprehensive matching rate of the power distribution network within a period of time; if one or both of the comprehensive matching degree and the comprehensive matching rate are lower than the threshold value, the consumption level is low, and influence factors of the DG consumption level, including the energy matching degree, the synchronization rate, the load fluctuation rate and the DG fluctuation rate, are calculated; calculating the average sensitivity of the comprehensive matching degree to each influence factor and the average sensitivity of the comprehensive matching rate to each influence factor; and selecting a high-cost performance improvement factor according to the average sensitivity calculation result to improve the various types of loads, the DG access positions and the DG access capacity so as to improve the DG consumption level. The invention evaluates the current consumption level from the matching angle, finds the improvement factor with high cost performance, and guides the planning to more reasonably arrange the access position and the capacity of the load and the DG, thereby achieving higher consumption level.
Description
Technical Field
the invention belongs to the field of power distribution network planning, and researches the consumption level of DGs in a power distribution network.
Background
a Distributed Generation (DG) access to a distribution network is an important way to consume renewable energy. However, the fluctuation of intermittent DG such as wind and light adversely affects the quality of electric energy, the voltage level, and the reliability of power supply. The large access of the DG also causes the problem of power back-delivery of the distribution network. Therefore, it is important to improve the DG consumption level through rational planning.
The existing research on DG consumption focuses on the DG acceptance capability of the power distribution network[1]The maximum DG capacity allowed to be connected to a distribution network under the premise of satisfying various safe operation constraints generally includes node voltage, line current carrying, electric energy quality and the like. On the other hand, research on DG absorption planning has focused on DG siting and sizing[2-3]in the aspect, the location and volume method obtains an optimal planning scheme based on a single target or multiple targets, and determines the position and the volume of DG access.
the core problem of the classical power distribution network planning is the matching of the power distribution network and the load, and the planned core index capacity-to-load ratio[4]The matching relationship is embodied. The invention considers that the core problem is the matching problem after considering DG consumption, but the matching connotation is expanded, and the matching between the load, the DG and the distribution network is evolved from the matching between the distribution network and the load.
[ reference documents ]
[1] Dong fugao, Wang defend, Yan inherits, distributed power supply acceptance evaluation method and promotion technology research overview [ J ] power grid technology, 2019,43(7): 2258-.
[2]LIU L,BAO H,LIU H.Siting and sizing of distributed generation based on the minimum transmission losses cost[C]//2011 IEEE Power Engineering and Automation Conference,September 8-9,2011,Wuhan,China.
[3] Liliang, Tang Wei, Baimu, etc. the multi-target distributed power supply location and volume determination planning considering the time sequence characteristics [ J ] power system automation, 2013,37(3):58-63.
[4] national grid company, city power grid planning and design guide, Q/GDW 156-2006 [ S ]. Beijing, China Power Press, 2006.
Disclosure of Invention
Aiming at the prior art, the invention provides a novel DG consumption evaluation method, which can evaluate the current consumption level from the matching angle, find out the improvement factor with high cost performance and guide the more reasonable arrangement of the load and the access position and capacity of the DG in the planning so as to achieve higher consumption level. The method for improving the DG consumption level of the power distribution network based on the total amount firstly provides a comprehensive matching evaluation index for evaluating the DG consumption level of the power distribution network, then analyzes influence factors of the DG consumption, and finally provides a method for improving the DG consumption level of the power distribution network based on the total amount. The method can evaluate the DG consumption level in a given distribution network, analyze the influence factors of the DG consumption, find the improvement factors with high cost performance when the consumption level is lower, and guide the improvement of the load curve or the DG curve to improve the consumption level.
in order to solve the technical problem, the invention provides a method for improving the DG consumption level of a power distribution network based on the total amount, which comprises the following steps:
Calculating according to various types of loads, DG access positions and capacities in the current power distribution network and feeder capacity, and considering network loss to obtain a feeder load rate;
Step two, calculating the comprehensive matching degree at a certain moment according to the load rate of the feeder line at the moment, and further calculating the comprehensive matching degree and the comprehensive matching rate of the power distribution network within a period of time;
Evaluating the consumption level of the DGs in the power distribution network according to the comprehensive matching degree and the comprehensive matching rate, and finishing if the comprehensive matching degree and the comprehensive matching rate are not lower than a threshold value; if one of the values is lower than or equal to the threshold value, the consumption level is low, and a step four is executed;
Step four, calculating the influence factors of the DG consumption level, including: energy matching degree, coincidence rate, load fluctuation rate and DG fluctuation rate;
calculating the comprehensive matching degree, the comprehensive matching rate and the energy matching degree, the sensitivity among the coincidence rate, the load fluctuation rate and the DG fluctuation rate, and calculating to obtain a sensitivity value corresponding to each period of data; then calculating the average sensitivity of the comprehensive matching degree to each influence factor and the average sensitivity of the comprehensive matching rate to each influence factor;
And step six, selecting a cost-effective improvement factor according to the average sensitivity calculation result to improve various types of loads, DG access positions and capacities so as to improve the DG consumption level.
Further, in the method for improving the DG consumption level of the power distribution network based on the total amount, the first step is specifically that the feeder load rate is calculated by the formula (1) according to various types of loads, DG access positions and capacities in the current power distribution network and feeder capacity, and the network loss
In formula (1):For the feeder load rate at time t,The active power of the feeder line at the moment t;Is the power factor; c. CBis the feeder capacity;The net load active power in the feeder line at the moment t;The active network loss at time t.
The concrete content of the step two is that the feeder load rate according to the time tCalculating the comprehensive matching degree at the time t by the formula (2)Then, the comprehensive matching degree D of the power distribution network within a period of time is respectively calculated by the formulas (3) and (4)CMAnd the comprehensive matching rate RCM(ii) a The method comprises the following steps:
integral of time tDegree of distributionfor the evaluation values which reflect the matching of the load and the DG, the matching of the net load and the feeder capacity and the matching of transmission and distribution and are obtained by calculation according to the feeder load rate at the moment, the calculation formula is as follows:
in the formula (2), the feeder operation state is divided as follows:
1) dividing a forward conveying area and a backward conveying area according to the positive and negative load rates;
2) According to the load rate, dividing a forward transmission area into a low load area, a medium load area, an economic operation area, a high load area and an overload area, and dividing a backward transmission area into a non-overload area and an overload area;
In the formula (2), mu1、μ2And mu3The boundary values of the low-load area and the medium-load area, the medium-load area and the economic operation area, and the economic operation area and the high-load area are respectively; d0The load rate is the comprehensive matching degree corresponding to 0; the value range of the comprehensive matching degree is (— infinity, 1)]Closer to 1 indicates higher matching; mu.s1、μ2And mu3Respectively 30%, 60% and 80%, d0Taking-0.3;
obtaining the comprehensive matching degree of each timeThen, in order to judge the matching degree within a period of time, the mean value of each moment is taken:
In formula (3): dCMObtaining the comprehensive matching degree of the power distribution network within a period of time, wherein the period of time is 1 day, the time scale is 1h, and T is 24;
comprehensive degree of matching DCMHas a value range of (- ∞, 1)]The closer to 1, the better the overall matching of the distribution network in the whole day, and the comprehensive matching degree threshold is set to be 0;
Calculating the comprehensive matching rate RCMComprehensive match ratio RCMThe comprehensive matching rate R is defined as the percentage of the time of the comprehensive matching degree not lower than the threshold value in 24h to the total timeCMThe calculation formula of (2) is as follows:
Comprehensive matching rate RCMThe closer to 1, the higher the proportion of the time with high comprehensive matching degree in the distribution network day to the total time, and the comprehensive matching rate threshold is set to be 60%.
The concrete content of the third step is that according to the comprehensive matching degree DCMAnd the comprehensive matching rate RCMEvaluating the consumption level of DGs in the power distribution network, and if the integrated matching degree D is obtainedCMAnd the comprehensive matching rate RCMAll are not lower than the threshold value, and the process is finished; if one or both are below the threshold value, indicating that the level of consumption is low, step four is performed.
Specifically, the fourth step is to calculate the influence factor IF of the DG absorption level from the formula (5) to the formula (10), and includes: degree of energy matching DEMWhile the ratio RSLoad fluctuation ratio RLFand DG fluctuation ratio RDGFAnd are denoted as IF in turn1、IF2、IF3and IF4I.e. the k-th influencing factor is denoted as IFk(ii) a The energy matching degree DEMThe coincidence degree of the load carried by the feeder line and the DG energy in one day, the coincidence rate RSFor the synchronism of the load carried by the feeder line and the DG one-day power curve, the load fluctuation rate RLFthe DG fluctuation rate R is the ratio of the standard deviation to the arithmetic mean of the load power curveDGFis the ratio of the standard deviation to the arithmetic mean of the DG power curve;
Degree of energy matching DEMthe calculation formula of (2) is as follows:
wherein
In formulae (5) and (6):the average load rate of the feeder line is; f is a function determined by equation (1); eLoad、EDGAnd ElossRespectively the load electricity consumption, DG generated energy and network loss energy in one day of the feeder line; degree of energy matching DEMHas a value range of (- ∞, 1)]Closer to 1 indicates a higher matching degree of the load and the DG energy;
Coincidence ratio RSThe calculation formula of (2) is as follows:
wherein
In formulae (7) and (8), PLoad、PDGLoad and DG power vectors respectively; r (P)Load,PDG) The correlation coefficient of the two; cov (P)Load,PDG) Is the covariance of the two; sigma (P)Load)、σ(PDG) Respectively the standard deviation of the load and the DG power vector; coincidence ratio RShas a value range of [0, 1]]The closer to 1, the better the load and DG power curve synchronism;
load fluctuation ratio RLFThe calculation formula of (2) is as follows:
In formula (9), σLoadStandard deviation of the load power curve; lambda [ alpha ]Loadis the arithmetic mean of the load power curve;
DG fluctuation ratio RDGFThe calculation formula of (2) is as follows:
In the formula (10), σDGIs the standard deviation of the DG power curve; lambda [ alpha ]DGThe arithmetic mean of the DG power curves.
the concrete content of the fifth step is that the comprehensive matching degree D is calculatedCMand the comprehensive matching rate RCMDegree of matching with energy DEMwhile the ratio RSLoad fluctuation ratio RLFAnd DG fluctuation ratio RDGFInter-sensitivity, i.e., how many percent of the independent variable increases the energy dependent variable per one percent increase relative to the current data for the independent and dependent variables; the sensitivity is a period-by-period sensitivity SpbpThe period-by-period method is that the current data of independent variables are changed to form multi-period independent variable data and dependent variable data, and each period data is calculated to obtain a sensitivity value;
In the formula (11), Spbp,iIs the i-th sensitivity; Δ xiand Δ yiRespectively are the variable quantity of the independent variable and the dependent variable relative to the current data; x is the number ofNAnd yNreference values for independent variables and dependent variables respectively; x is the number ofiand yiIndependent variables and dependent variables of the ith stage are respectively; x is the number ofaAnd yaRespectively are independent variable current data and dependent variable current data;
when the periodic sensitivity is calculated by the formula (11), the independent variable is the energy matching degree DEMwhile the ratio RSLoad fluctuation ratio RLFAnd DG fluctuation ratio RDGFDependent variable is the degree of complex matching DCMAnd the comprehensive matching rate RCM(ii) a The reference value of each index is the maximum value which can be obtained; degree of energy matching DEMand the coincidence ratio RSEnergy matching degree, coincidence rate and comprehensive matching degree DCMAnd the comprehensive matching rate RCMIs 1; load fluctuation ratio RLFAnd DG fluctuation ratio RDGThe maximum value of (A) is changed along with the load and DG curves, the reference value of the load and DG curves is obtained by subtracting the minimum value in one day from the load and DG curves respectively, and thenCalculated by formula (9) and formula (10);
After the periodic sensitivity is obtained, averaging is performed to obtain an average sensitivity S:
In the formula (12), n is the period number, and n is 10;
For each influencing factor IFkSelecting n different values { IF (intermediate frequency) different from the current data in the value rangek,1,...,IFk,n}; calculating IF with other influencing factors remaining unchangedkcomprehensive matching degree set { D under different valuesCM,1,...,DCM,nR and the set of integrated match rates { R }CM,1,...,RCM,n}；
Calculating the comprehensive matching degree D by using the formula (11)CMAnd the comprehensive matching rate RCMDegree of matching with energy DEMWhile the ratio RSLoad fluctuation ratio RLFand DG fluctuation ratio RDGFThe sensitivity of the sensor is gradually changed in time,
the comprehensive matching degree D is calculated by the formula (12)CMaverage sensitivity S to influences IFD,IFkAnd the comprehensive matching rate RCMaverage sensitivity S to influences IFR,Ifk。
Selecting a high-cost performance improvement factor according to the average sensitivity calculation result to improve various types of loads, DG access positions and capacities so as to improve the DG consumption level;
comprehensively considering the average sensitivity S of the comprehensive matching degree to each influence factorD,IFkAnd average sensitivity S of the overall matching rate to each influence factorR,IFkIf an influence factor with a significantly larger average sensitivity absolute value exists, selecting the influence factor as a first improvement factor, improving the first improvement factor by adjusting various types of loads, DG access positions and capacities, improving the DG consumption level, and ending;
If two influencing factors with similar average sensitivity absolute values and larger average sensitivity absolute values exist, the influencing factors are respectively selected as a first improving factor and a second improving factorA peptide; the first improvement factor is improved by adjusting the load of each type and the position and the capacity of the DG access, the consumption level of the DG is improved, and the improved comprehensive matching degree D is recalculatedCMAnd the comprehensive matching rate RCM(ii) a Judging the improved comprehensive matching degree DCMAnd the comprehensive matching rate RCMIf not, ending; if not, the second improvement factor is improved by adjusting the positions and the capacities of various types of loads and DGs to meet the comprehensive matching degree DCMAnd the comprehensive matching rate RCMAnd all are not lower than the threshold value, and the process is finished.
Compared with the prior art, the invention has the beneficial effects that:
The invention provides a method for improving the DG consumption level of a power distribution network based on the total amount, which can evaluate the DG consumption level in the power distribution network, find out the improvement factor with high cost performance when the consumption level is lower, guide the improvement of a load or a DG curve to improve the consumption level and provide a more accurate reference basis for planning the load and the DG of the power distribution network.
Drawings
Fig. 1 is a flowchart of a method for increasing DG consumption level of a power distribution network in accordance with the present invention;
FIG. 2 is a diagram illustrating the calculation of the comprehensive matching degree at time t according to the present invention;
FIG. 3 is a schematic diagram of a power distribution network according to an embodiment of the present invention;
FIG. 4 is a graph of feeder F1 and F2 power curves in an example;
FIG. 5 shows the sub-regions and locations where an exemplary feed line F2 improves the energy matching before and after;
Fig. 6 is a comparison of the power curves before and after improvement of an exemplary feed line F2.
Detailed Description
As shown in fig. 1, the method for increasing the DG consumption level of the power distribution network based on the total amount provided by the present invention includes the following steps:
calculating according to various types of loads, DG access positions and capacities in the current power distribution network and feeder capacity, and considering network loss to obtain a feeder load rate;
Step two, calculating the comprehensive matching degree at a certain moment according to the load rate of the feeder line at the moment, and further calculating the comprehensive matching degree and the comprehensive matching rate of the power distribution network within a period of time;
Evaluating the consumption level of the DGs in the power distribution network according to the comprehensive matching degree and the comprehensive matching rate, and finishing if the comprehensive matching degree and the comprehensive matching rate are not lower than a threshold value; if one of the values is lower than or equal to the threshold value, the consumption level is low, and a step four is executed;
Step four, calculating the influence factors of the DG consumption level, including: energy matching degree, coincidence rate, load fluctuation rate and DG fluctuation rate;
Calculating the comprehensive matching degree, the comprehensive matching rate and the energy matching degree, the sensitivity among the coincidence rate, the load fluctuation rate and the DG fluctuation rate, and calculating to obtain a sensitivity value corresponding to each period of data; then calculating the average sensitivity of the comprehensive matching degree to each influence factor and the average sensitivity of the comprehensive matching rate to each influence factor;
and step six, selecting a cost-effective improvement factor according to the average sensitivity calculation result to improve various types of loads, DG access positions and capacities so as to improve the DG consumption level.
The concrete content of the step one is that the feeder load rate is calculated by the formula (1) according to various types of loads, DG access positions and capacities in the current power distribution network and feeder capacity, and the network loss
In formula (1):For the feeder load rate at time t,The active power of the feeder line at the moment t;Is the power factor; c. CBis the feeder capacity;the net load active power in the feeder line at the moment t;the active network loss at time t.
the concrete content of the step two is that the feeder load rate according to the time tCalculating the comprehensive matching degree at the time t by the formula (2)Then, the comprehensive matching degree D of the power distribution network within a period of time is respectively calculated by the formulas (3) and (4)CMAnd the comprehensive matching rate RCM(ii) a The method comprises the following steps:
Comprehensive matching degree at time tfor the evaluation values which reflect the matching of the load and the DG, the matching of the net load and the feeder capacity and the matching of transmission and distribution and are obtained by calculation according to the feeder load rate at the moment, the calculation formula is as follows:
In the formula (2), as shown in fig. 2, the feeder operation state is divided as follows:
1) Dividing a forward conveying area and a backward conveying area according to the positive and negative load rates;
2) According to the load rate, dividing a forward transmission area into a low load area, a medium load area, an economic operation area, a high load area and an overload area, and dividing a backward transmission area into a non-overload area and an overload area;
in the formula (2), mu1、μ2And mu3The boundary values of the low-load area and the medium-load area, the medium-load area and the economic operation area, and the economic operation area and the high-load area are respectively; d0The load rate is the comprehensive matching degree corresponding to 0; the value range of the comprehensive matching degree is (— infinity, 1)]closer to 1 indicates higher matching; mu.s1、μ2And mu3respectively 30%, 60% and 80%, d0Taking-0.3;
obtaining the comprehensive matching degree of each timeThen, in order to judge the matching degree within a period of time, the mean value of each moment is taken:
In formula (3): dCMObtaining the comprehensive matching degree of the power distribution network within a period of time, wherein the period of time is 1 day, the time scale is 1h, and T is 24;
Comprehensive degree of matching DCMHas a value range of (- ∞, 1)]The closer to 1, the better the overall matching of the distribution network in the whole day, and the comprehensive matching degree threshold is set to be 0;
Calculating the comprehensive matching rate RCMcomprehensive match ratio RCMThe comprehensive matching rate R is defined as the percentage of the time of the comprehensive matching degree not lower than the threshold value in 24h to the total timeCMThe calculation formula of (2) is as follows:
comprehensive matching rate RCMThe closer to 1, the higher the proportion of the time with high comprehensive matching degree in the distribution network day to the total time, and the comprehensive matching rate threshold is set to be 60%.
The concrete content of the third step is that according to the comprehensive matching degree DCMAnd the comprehensive matching rate RCMEvaluating the consumption level of DGs in the power distribution network, and if the integrated matching degree D is obtainedCMAnd the comprehensive matching rate RCMAll are not lower than the threshold value, and the process is finished; if one or both are below the threshold value, indicating that the level of consumption is low, step four is performed.
the concrete content of the fourth step is that the DG consumption level is calculated by the formula (5) to the formula (10)Influencing factors IF, including: degree of energy matching DEMWhile the ratio RSLoad fluctuation ratio RLFAnd DG fluctuation ratio RDGFAnd are denoted as IF in turn1、IF2、IF3and IF4I.e. the k-th influencing factor is denoted as IFk(ii) a The energy matching degree DEMthe coincidence degree of the load carried by the feeder line and the DG energy in one day, the coincidence rate RSFor the synchronism of the load carried by the feeder line and the DG one-day power curve, the load fluctuation rate RLFThe DG fluctuation rate R is the ratio of the standard deviation to the arithmetic mean of the load power curveDGFIs the ratio of the standard deviation to the arithmetic mean of the DG power curve;
Degree of energy matching DEMThe calculation formula of (2) is as follows:
Wherein
in formulae (5) and (6):The average load rate of the feeder line is; f is a function determined by equation (1); eLoad、EDGand ElossRespectively the load electricity consumption, DG generated energy and network loss energy in one day of the feeder line; degree of energy matching DEMHas a value range of (- ∞, 1)]closer to 1 indicates a higher matching degree of the load and the DG energy;
Coincidence ratio RSThe calculation formula of (2) is as follows:
wherein
In formulae (7) and (8), PLoad、PDGLoad and DG power vectors respectively; r (P)Load,PDG) The correlation coefficient of the two; cov (P)Load,PDG) Is the covariance of the two; sigma (P)Load)、σ(PDG) Respectively the standard deviation of the load and the DG power vector; coincidence ratio RSHas a value range of [0, 1]]The closer to 1, the better the load and DG power curve synchronism;
Load fluctuation ratio RLFThe calculation formula of (2) is as follows:
In formula (9), σLoadStandard deviation of the load power curve; lambda [ alpha ]LoadIs the arithmetic mean of the load power curve;
DG fluctuation ratio RDGFthe calculation formula of (2) is as follows:
In the formula (10), σDGIs the standard deviation of the DG power curve; lambda [ alpha ]DGThe arithmetic mean of the DG power curves.
The concrete content of the fifth step is that the comprehensive matching degree D is calculatedCMAnd the comprehensive matching rate RCMdegree of matching with energy DEMWhile the ratio RSLoad fluctuation ratio RLFAnd DG fluctuation ratio RDGFInter-sensitivity, i.e., how many percent of the independent variable increases the energy dependent variable per one percent increase relative to the current data for the independent and dependent variables; the sensitivity is a period-by-period sensitivity SpbpThe period-by-period method is that the current data of independent variables are changed to form multi-period independent variable data and dependent variable data, and each period data is calculated to obtain a sensitivity value;
in the formula (11), Spbp,iis the i-th sensitivity; Δ xiAnd Δ yirespectively are the variable quantity of the independent variable and the dependent variable relative to the current data; x is the number ofNAnd yNReference values for independent variables and dependent variables respectively; x is the number ofiAnd yiindependent variables and dependent variables of the ith stage are respectively; x is the number ofaAnd yaRespectively are independent variable current data and dependent variable current data;
when the periodic sensitivity is calculated by the formula (11), the independent variable is the energy matching degree DEMWhile the ratio RSload fluctuation ratio RLFand DG fluctuation ratio RDGFDependent variable is the degree of complex matching DCMand the comprehensive matching rate RCM(ii) a The reference value of each index is the maximum value which can be obtained; degree of energy matching DEMand the coincidence ratio RSEnergy matching degree, coincidence rate and comprehensive matching degree DCMAnd the comprehensive matching rate RCMIs 1; load fluctuation ratio RLFand DG fluctuation ratio RDGThe maximum value of the load and the DG curve is changed, the reference value of the load and the DG curve is obtained by calculating the formula (9) and the formula (10) after the minimum value in one day is subtracted from the load and the DG curve respectively;
after the periodic sensitivity is obtained, averaging is performed to obtain an average sensitivity S:
in the formula (12), n is the period number, and n is 10;
For each influencing factor IFkSelecting n different values { IF (intermediate frequency) different from the current data in the value rangek,1,...,IFk,n}; calculating IF with other influencing factors remaining unchangedkcomprehensive matching degree set { D under different valuesCM,1,...,DCM,nR and the set of integrated match rates { R }CM,1,...,RCM,n}；
calculating the comprehensive matching degree D by using the formula (11)CMAnd the comprehensive matching rate RCMDegree of matching with energy DEMWhile the ratio RSLoad fluctuation ratio RLFAnd DG fluctuation ratio RDGFThe sensitivity of the sensor is gradually changed in time,
the comprehensive matching degree D is calculated by the formula (12)CMAverage sensitivity S to influences IFD,IFkAnd the comprehensive matching rate RCMAverage sensitivity S to influences IFR,Ifk。
Selecting a high-cost performance improvement factor according to the average sensitivity calculation result to improve various types of loads, DG access positions and capacities so as to improve the DG consumption level; comprehensively considering the average sensitivity S of the comprehensive matching degree to each influence factorD,IFkAnd average sensitivity S of the overall matching rate to each influence factorR,IFkIf an influence factor with a significantly larger average sensitivity absolute value exists, selecting the influence factor as a first improvement factor, improving the first improvement factor by adjusting various types of loads, DG access positions and capacities, improving the DG consumption level, and ending; if two influence factors with similar average sensitivity absolute values and larger average sensitivity absolute values exist, the two influence factors are respectively selected as a first improvement factor and a second improvement factor; the first improvement factor is improved by adjusting the load of each type and the position and the capacity of the DG access, the consumption level of the DG is improved, and the improved comprehensive matching degree D is recalculatedCMAnd the comprehensive matching rate RCM(ii) a Judging the improved comprehensive matching degree DCMAnd the comprehensive matching rate RCMif not, ending; if not, the second improvement factor is improved by adjusting the positions and the capacities of various types of loads and DGs to meet the comprehensive matching degree DCMAnd the comprehensive matching rate RCMAnd all are not lower than the threshold value, and the process is finished.
The technical solution of the present invention is further described in detail with reference to the drawings and an example, but the present invention is not limited by the example.
summary of the first, example
a10 kV power distribution network in an industrial park of Jiangsu is shown in figure 3. The power distribution network has 2 feeders, the line capacity is 5.03MVA, and the power factor is 0.95. The load node data, the DG node data and the typical daily data of each type of load and DG are respectively shown in tables 1-3. In the improvement, the reference values of the respective indices are set as shown in Table 4. The power curves for feed lines F1 and F2 are shown in fig. 4.
Table 1 load node data
In table 1, the loads are numbered according to their hooking nodes, corresponding to fig. 3.
Table 2 DG node data
in table 2, DG is numbered according to its hooking node and corresponds to fig. 3.
TABLE 3 typical daily data (per unit value) for each type of load and DG
TABLE 4 reference values of the respective indices
Implementation process for improving DG consumption level of power distribution network based on total amount
1) Calculating DG consumption evaluation index and influence factor index
In the calculation of the calculation example, the load flow calculation is carried out at each time, the network loss is accurately calculated, and the network loss rate at each time of F1 and F2 is shown in tables 5 and 6 respectively. Evaluation indexes of F1 and F2 were calculated from formulas (1) to (4), and influencing factors of F1 and F2 were calculated from formulas (5) to (10), and the results are shown in Table 7.
Table 5 feed line F1 network loss rate at each time
Table 6 feed line F2 network loss rate at each time
TABLE 7 feeder F1 and F2 targets
In table 7, bold characters are data below the threshold, and as can be seen from table 7, F1 has a high consumption level, and as verified by load flow calculation, no line capacity or node voltage out-of-limit occurs at each time point of F1. F2 has low absorption level and needs improvement.
2) Increase in DG consumption level
The stage-by-stage sensitivity of the evaluation index in F2 to the influence factors is calculated by formula (11), and is shown in Table 8; the calculated sensitivities are shown in Table 9 by the formula (12).
TABLE 8 Per-term sensitivity of feeder F2 evaluation index to influencing factors
TABLE 9 sensitivity of feeder F2 evaluation index to influencing factors
In table 9, bold face is the first improvement factor. As can be seen from Table 9, the first improvement factor is DEMAnd D isCMAnd RCMTo DEMAll sensitivities of (D) are positive, D should be increasedEMIncrease DCMAnd RCM. D can be increased in various waysEMsuch as increasing load power, decreasing DG power, etc. The mode of increasing the load power is adopted, the comparison of the power curves before and after the improvement is shown in a figure 6, and the index comparison is shown in a table 10.
TABLE 10 comparison of indexes before and after feeder F2 improvement
In table 10, bold face is the first improvement factor. As can be seen from Table 10, the first improvement factor DEMThe value of (d) increased from-0.1038 to 1.0. As can be seen in FIG. 5, DEMPartition is alsoFrom "low load zone" to "economic operation zone", DCMAnd RCMIncreased to 0.7885 and 100%, respectively.
Therefore, the method can evaluate the DG consumption level of the power distribution network, and improves the DG consumption level after finding out the high-cost-performance improvement factors based on sensitivity analysis, so that the consumption level is obviously improved.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (7)
1. A method for improving the DG consumption level of a power distribution network based on the total amount is characterized by comprising the following steps:
calculating according to various types of loads, DG access positions and capacities in the current power distribution network and feeder capacity, and considering network loss to obtain a feeder load rate;
Step two, calculating the comprehensive matching degree at a certain moment according to the load rate of the feeder line at the moment, and further calculating the comprehensive matching degree and the comprehensive matching rate of the power distribution network within a period of time;
Evaluating the consumption level of the DGs in the power distribution network according to the comprehensive matching degree and the comprehensive matching rate, and finishing if the comprehensive matching degree and the comprehensive matching rate are not lower than a threshold value; if one of the values is lower than or equal to the threshold value, the consumption level is low, and a step four is executed;
step four, calculating the influence factors of the DG consumption level, including: energy matching degree, coincidence rate, load fluctuation rate and DG fluctuation rate;
Calculating the comprehensive matching degree, the comprehensive matching rate and the energy matching degree, the sensitivity among the coincidence rate, the load fluctuation rate and the DG fluctuation rate, and calculating to obtain a sensitivity value corresponding to each period of data; then calculating the average sensitivity of the comprehensive matching degree to each influence factor and the average sensitivity of the comprehensive matching rate to each influence factor;
And step six, selecting a cost-effective improvement factor according to the average sensitivity calculation result to improve various types of loads, DG access positions and capacities so as to improve the DG consumption level.
2. The method for increasing the DG consumption level of the power distribution network based on the total amount according to claim 1, wherein the specific content of the first step is as follows:
Calculating according to various types of loads, DG access positions and capacities in the current power distribution network and feeder capacity and considering network loss to obtain a feeder load rate by the formula (1)
in formula (1):For the feeder load rate at time t,The active power of the feeder line at the moment t;Is the power factor; c. CBIs the feeder capacity;The net load active power in the feeder line at the moment t;The active network loss at time t.
3. The method for increasing the DG consumption level of the power distribution network based on the total amount according to claim 2, wherein the specific content of the second step is as follows:
According to the load rate of the feeder line at the time tCalculating the comprehensive matching degree at the time t by the formula (2)Then, the comprehensive matching degree D of the power distribution network within a period of time is respectively calculated by the formulas (3) and (4)CMAnd the comprehensive matching rate RCM(ii) a The method comprises the following steps:
Comprehensive matching degree at time tfor the evaluation values which reflect the matching of the load and the DG, the matching of the net load and the feeder capacity and the matching of transmission and distribution and are obtained by calculation according to the feeder load rate at the moment, the calculation formula is as follows:
In the formula (2), the feeder operation state is divided as follows:
1) dividing a forward conveying area and a backward conveying area according to the positive and negative load rates;
2) According to the load rate, dividing a forward transmission area into a low load area, a medium load area, an economic operation area, a high load area and an overload area, and dividing a backward transmission area into a non-overload area and an overload area;
In the formula (2), mu1、μ2And mu3The boundary values of the low-load area and the medium-load area, the medium-load area and the economic operation area, and the economic operation area and the high-load area are respectively; d0The load rate is the comprehensive matching degree corresponding to 0; the value range of the comprehensive matching degree is (— infinity, 1)]Closer to 1 indicates higher matching; mu.s1、μ2And mu3respectively 30%, 60% and 80%, d0Taking-0.3;
obtaining the comprehensive matching degree of each timeThen, in order to judge the matching degree within a period of time, the mean value of each moment is taken:
In formula (3): dCMObtaining the comprehensive matching degree of the power distribution network within a period of time, wherein the period of time is 1 day, the time scale is 1h, and T is 24;
Comprehensive degree of matching DCMHas a value range of (- ∞, 1)]the closer to 1, the better the overall matching of the distribution network in the whole day, and the comprehensive matching degree threshold is set to be 0;
calculating the comprehensive matching rate RCMcomprehensive match ratio RCMThe comprehensive matching rate R is defined as the percentage of the time of the comprehensive matching degree not lower than the threshold value in 24h to the total timeCMThe calculation formula of (2) is as follows:
Comprehensive matching rate RCMThe closer to 1, the higher the proportion of the time with high comprehensive matching degree in the distribution network day to the total time, and the comprehensive matching rate threshold is set to be 60%.
4. The method for increasing the DG consumption level of the power distribution network based on the total amount according to claim 3, wherein the specific content of the third step is as follows:
According to the comprehensive matching degree DCMAnd the comprehensive matching rate RCMThe level of DG absorption within the power distribution network is evaluated,
If the comprehensive matching degree DCMAnd the comprehensive matching rate RCMAll are not lower than the threshold value, and the process is finished;
if one or both are below the threshold value, indicating that the level of consumption is low, step four is performed.
5. The method for increasing the DG consumption level of the power distribution network based on the total amount according to claim 4, wherein the specific content of the fourth step is as follows:
Calculating the influence factor IF of DG absorption level from equation (5) -equation (10), including: degree of energy matching DEMwhile the ratio RSLoad fluctuation ratio RLFand DG fluctuation ratio RDGFand are denoted as IF in turn1、IF2、IF3And IF4I.e. the k-th influencing factor is denoted as IFk(ii) a The energy matching degree DEMThe coincidence degree of the load carried by the feeder line and the DG energy in one day, the coincidence rate RSfor the synchronism of the load carried by the feeder line and the DG one-day power curve, the load fluctuation rate RLFThe DG fluctuation rate R is the ratio of the standard deviation to the arithmetic mean of the load power curveDGFis the ratio of the standard deviation to the arithmetic mean of the DG power curve;
Degree of energy matching DEMThe calculation formula of (2) is as follows:
wherein
In formulae (5) and (6):The average load rate of the feeder line is; f is a function determined by equation (1); eLoad、EDGAnd ElossRespectively the load electricity consumption, DG generated energy and network loss energy in one day of the feeder line; degree of energy matching DEMHas a value range of (- ∞, 1)]Closer to 1 indicates a higher matching degree of the load and the DG energy;
Coincidence ratio RSThe calculation formula of (2) is as follows:
Wherein
In formulae (7) and (8), PLoad、PDGLoad and DG power vectors respectively; r (P)Load,PDG) The correlation coefficient of the two; cov (P)Load,PDG) Is the covariance of the two; sigma (P)Load)、σ(PDG) Respectively the standard deviation of the load and the DG power vector; coincidence ratio RSHas a value range of [0, 1]]The closer to 1, the better the load and DG power curve synchronism;
Load fluctuation ratio RLFthe calculation formula of (2) is as follows:
In formula (9), σLoadStandard deviation of the load power curve; lambda [ alpha ]LoadIs the arithmetic mean of the load power curve;
DG fluctuation ratio RDGFThe calculation formula of (2) is as follows:
In the formula (10), σDGIs the standard deviation of the DG power curve; lambda [ alpha ]DGthe arithmetic mean of the DG power curves.
6. The method for increasing the DG consumption level of the power distribution network based on the total amount according to claim 5, wherein the concrete contents of the fifth step are as follows:
calculating the comprehensive matching degree DCMAnd the comprehensive matching rate RCMDegree of matching with energy DEMWhile the ratio RSload fluctuation ratio RLFand DG fluctuation ratio RDGFInter-sensitivity, i.e., how many percent of the independent variable increases the energy dependent variable per one percent increase relative to the current data for the independent and dependent variables; the sensitivity is a period-by-period sensitivity Spbpthe term-by-term means that the current data of the independent variable is changed to form a multi-term independent variableAnd dependent variable data, each period of data is calculated to obtain a sensitivity value;
In the formula (11), Spbp,iIs the i-th sensitivity; Δ xiand Δ yiRespectively are the variable quantity of the independent variable and the dependent variable relative to the current data; x is the number ofNand yNReference values for independent variables and dependent variables respectively; x is the number ofiAnd yiIndependent variables and dependent variables of the ith stage are respectively; x is the number ofaAnd yaRespectively are independent variable current data and dependent variable current data;
When the periodic sensitivity is calculated by the formula (11), the independent variable is the energy matching degree DEMWhile the ratio RSLoad fluctuation ratio RLFAnd DG fluctuation ratio RDGFDependent variable is the degree of complex matching DCMAnd the comprehensive matching rate RCM(ii) a The reference value of each index is the maximum value which can be obtained; degree of energy matching DEMand the coincidence ratio RSEnergy matching degree, coincidence rate and comprehensive matching degree DCMAnd the comprehensive matching rate RCMIs 1; load fluctuation ratio RLFAnd DG fluctuation ratio RDGThe maximum value of the load and the DG curve is changed, the reference value of the load and the DG curve is obtained by calculating the formula (9) and the formula (10) after the minimum value in one day is subtracted from the load and the DG curve respectively;
after the periodic sensitivity is obtained, averaging is performed to obtain an average sensitivity S:
In the formula (12), n is the period number, and n is 10;
For each influencing factor IFkSelecting n different values { IF (intermediate frequency) different from the current data in the value rangek,1,...,IFk,n}; calculating IF with other influencing factors remaining unchangedkComprehensive matching degree set { D under different valuesCM,1,...,DCM,nThe set of matching rates with the synthesisAnd then { RCM,1,...,RCM,n}；
Calculating the comprehensive matching degree D by using the formula (11)CMAnd the comprehensive matching rate RCMDegree of matching with energy DEMWhile the ratio RSLoad fluctuation ratio RLFAnd DG fluctuation ratio RDGFthe sensitivity of the sensor is gradually changed in time,
The comprehensive matching degree D is calculated by the formula (12)CMAverage sensitivity S to influences IFD,IFkAnd the comprehensive matching rate RCMaverage sensitivity S to influences IFR,Ifk。
7. The method for increasing the DG consumption level of the power distribution network based on the total amount according to claim 6, wherein the specific content of the sixth step is as follows:
Selecting a high-cost performance improvement factor according to the average sensitivity calculation result to improve various types of loads, DG access positions and DG access capacities so as to improve the DG consumption level;
comprehensively considering the average sensitivity S of the comprehensive matching degree to each influence factorD,IFkAnd average sensitivity S of the overall matching rate to each influence factorR,IFkif an influence factor with a significantly larger average sensitivity absolute value exists, selecting the influence factor as a first improvement factor, improving the first improvement factor by adjusting various types of loads, DG access positions and capacities, improving the DG consumption level, and ending;
If two influence factors with similar average sensitivity absolute values and larger average sensitivity absolute values exist, the two influence factors are respectively selected as a first improvement factor and a second improvement factor; the first improvement factor is improved by adjusting the load of each type and the position and the capacity of the DG access, the consumption level of the DG is improved, and the improved comprehensive matching degree D is recalculatedCMAnd the comprehensive matching rate RCM(ii) a Judging the improved comprehensive matching degree DCMAnd the comprehensive matching rate RCMIf not, ending; if not, the second improvement factor is improved by adjusting the positions and the capacities of various types of loads and DGs to meet the comprehensive matching degree DCMAnd the comprehensive matching rate RCMand all are not lower than the threshold value, and the process is finished.
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