CN106570776B - Theoretical line loss level calculation and evaluation method based on regional power grid actual measurement operation parameters - Google Patents
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Abstract
The invention provides an effective theoretical line loss level calculation and evaluation method for solving the problem of lack of evaluation means of the theoretical line loss level of a regional power grid, which comprises the steps of presetting a plurality of voltage grades for evaluating the theoretical line loss level of the regional power grid for the regional power grid to be evaluated, selecting a representative day to carry out line loss theoretical calculation, obtaining the power supply quantity of the preset plurality of voltage grades, the whole-grid power supply quantity and the whole-grid theoretical line loss rate formed by the plurality of voltage grades, the theoretical line loss rate of the previous-level regional power grid and the plurality of voltage grades same as the plurality of voltage grades, and finally evaluating the theoretical line loss level by calculating the theoretical line loss level difference rate K of the regional power grid to be evaluated. The method abandons the traditional method of only relying on experience and lacking scientific judgment basis for the regional theoretical line loss level, provides an effective theoretical line loss level calculation and evaluation method, and has higher practicability and operability.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an effective theoretical line loss level evaluation method, and particularly relates to a theoretical line loss level evaluation method based on regional power grid actual measurement operation parameters through a real-time database and a data mining technology.
Background
The line loss is the life pulse of a power supply enterprise and reflects the work effect of the aspects of enterprise technology, management and the like. Power supply enterprises are often influenced by factors such as large fluctuation of line loss rate, large abnormal values of line loss rate and the like in the analysis of line loss statistics, and reasonable loss reduction measures cannot be provided only by analyzing and counting the line loss rate. The theoretical line loss calculation of the power grid is one of important technical means adopted by a power grid company for analyzing and deciding a power system, and various indexes of the power grid are analyzed through the theoretical line loss calculation, so that the problems existing in the power grid at present, such as the defects of a grid structure of the power grid and the operation of a system, are found out, and a theoretical basis is provided for energy conservation and loss reduction of the power grid. With the development of line loss refinement work, the evaluation of the theoretical line loss levels in different areas has great guiding significance on the level of the theoretical line loss in each solution area and the difference between the theoretical line loss levels in each solution area of line loss practitioners, and the evaluation of the line loss work by management departments is facilitated.
Conventionally, the method for evaluating the theoretical line loss level of each region usually only depends on experience and lacks a scientific judgment basis, and the problem of lack of practicability and operability exists in the evaluation of the theoretical line loss level of each region.
In order to solve the above problems, the institute of electrical science and power science of Jiangsu Power saving corporation, the 'Chinese electric power' at volume 48, the 12 th (published in 2015 12 months), and the Chinese invention patent application CN201410142879.3 which is proposed by the institute of Electrical science and Power saving corporation of Jiangsu province together with the national grid company disclose a line loss level evaluation method based on grid characteristic differences.
Disclosure of Invention
The invention provides a theoretical line loss level evaluation method based on regional power grid actual measurement operation parameters and a regional power grid theoretical line loss level calculation method based on the evaluation method, aiming at solving the problem that the theoretical line loss level evaluation of each region lacks practicability and operability only by experience and scientific judgment basis in the traditional evaluation mode of regional theoretical line loss level.
The technical problem to be solved by the invention can be realized by the following technical scheme:
in a first aspect of the present invention, a method for calculating a theoretical line loss level based on measured operating parameters of a regional power grid is characterized by comprising the following steps:
1) presetting a plurality of voltage grades for evaluating the theoretical line loss level of the regional power grid for the regional power grid to be evaluated, and selecting a representative day for performing theoretical line loss calculation;
2) calculating the power supply quantity of a plurality of preset voltage levels of the regional power grid to be evaluated on a representative day, the power supply quantity of the whole power grid and the theoretical line loss rate of the whole power grid, wherein the power supply quantity of the whole power grid is formed by the voltage levels,
3) calculating theoretical line loss rates of a plurality of voltage grades of the power grid of the area to be evaluated on the last level of the representative day, wherein the voltage grades are the same as the plurality of voltage grades;
4) and calculating the difference rate K of the theoretical line loss level of the power grid in the area to be evaluated.
In the invention, the theoretical line loss level difference rate of the power grid in the area to be evaluated
Wherein α is the total grid power supply of the regional power grid to be evaluated, αiPower supply amount of i voltage class of the power grid of the region to be evaluated, β theoretical line loss rate of the whole power grid of the region to be evaluated, βiThe theoretical loss rate of the i-voltage grade line of the upper-level regional power grid of the regional power grid is to be evaluated.
In the invention, the preset voltage grades are all voltage grades of the power grid of the area to be evaluated.
In the present invention, the preset multiple voltage levels include: 220kV, 110kV, 35kV, 10kV and 380V.
In the invention, the power grid of the region to be evaluated is a local-city-level power grid, and the power grid of the previous level is a provincial-level power grid.
In a second aspect of the present invention, a theoretical line loss level evaluation method based on measured operation parameters of a regional power grid is characterized by including: and calculating the theoretical line loss level difference rate K of a plurality of regional power grids to be evaluated within the same upper-level regional power grid range, wherein the smaller the theoretical line loss level difference rate K is, the better the theoretical line loss level of the regional power grids to be evaluated is.
In the invention, the theoretical line loss level of the power grid of the region to be evaluated with the theoretical line loss level difference rate K <1 is superior to the average theoretical line loss level of the power grid of the previous region.
In the invention, for the power grid of the region to be evaluated, the difference value of the theoretical line loss level difference rate K is less than 0.1, the power grid is considered to be at the same theoretical line loss level.
And for a plurality of power grids of the area to be evaluated, which are considered to be at the same theoretical line loss level, acquiring theoretical line loss level difference rate K representing the same day of the previous year, and evaluating the theoretical line loss levels of the power grids of the areas to be evaluated according to the theoretical line loss level difference rate K of the same day of the previous year.
The same day of the past year of the representative day is the same day of the previous year of the representative day, and the theoretical line loss level of the power grid in the region to be evaluated is better when the difference rate of the theoretical line loss level is larger relative to the negative increase value of the same day of the previous year.
The theoretical line loss level calculation and evaluation method based on the regional power grid actual measurement operation parameters adopts advanced technologies such as a real-time database and a data mining technology, abandons the traditional method that the theoretical line loss level of the regional power grid is only based on experience and lacks scientific judgment basis, provides an effective theoretical line loss level calculation and evaluation method, and has higher practicability and operability.
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The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is a flow chart of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described below by combining the specific drawings.
The invention provides a theoretical line loss level evaluation method based on regional power grid actual measurement operation parameters through a real-time database and a data mining technology, and also provides a theoretical line loss level calculation method based on regional power grid actual measurement operation parameters, so as to provide a basis for regional power grid theoretical line loss level evaluation and further solve the problems.
Referring to fig. 1, the evaluation of the theoretical line loss level of the regional power grid performed by the invention is an evaluation mode based on actual measurement operation parameters, and when processing is performed, firstly, the theoretical line loss level of the regional power grid to be evaluated is calculated to obtain the evaluation parameters of the regional power grid, and then, the evaluation parameters of a plurality of regional power grids to be evaluated are compared, and finally, the evaluation of the theoretical line loss level of the regional power grid is completed. Although the whole evaluation process is in a sequential order, the whole evaluation process has great relevance, and therefore, the whole evaluation process is described together in the specification.
Aiming at the first aspect of the invention, a theoretical line loss level calculation method based on regional power grid actual measurement operation parameters comprises the steps of firstly selecting a proper representative day, and presetting a plurality of voltage grades for evaluating the theoretical line loss level of the regional power grid for the regional power grid to be evaluated after the selected representative day, wherein the preset voltage grades can be reasonably selected according to the actual conditions of the regional power grid to be evaluated and the previous regional power grid of the regional power grid to be evaluated, and comprehensively considering the power consumption proportion of each voltage grade, the historical theoretical line loss rate and the like, and selecting the voltage grade which has a larger influence on the theoretical line loss level evaluation in the regional power grid to be evaluated and the previous regional power grid. Certainly, in actual operation, if the voltage levels of the local power grid and the power grid in the previous level are less, the preset multiple voltage levels may adopt all the voltage levels of the local power grid to be evaluated, in a typical preferred operation mode, the usually better preset multiple voltage levels include 220kV, 110kV, 35kV, 10kV and 380V, in part of the local power grid to be evaluated, the voltage levels may be all the voltage levels of the area, it can be understood that all the voltage levels in part of the area may further include 1000kV and 500kV, and the preset multiple voltage levels need to be selected according to actual conditions.
After the presetting (selection) of a plurality of voltage levels is completed, the actually selected voltage levels form a whole network for theoretical line loss level evaluation, the whole network is understood as an object whole network for theoretical line loss level evaluation rather than a real whole network of a regional power grid to be evaluated, and when the preset voltage levels are all the voltage levels of the regional power grid to be evaluated, the object whole network for theoretical line loss level evaluation is the real whole network of the regional power grid to be evaluated. It should be understood by those skilled in the art from the description of the present specification that the present invention relates to a full-net concept formed by presetting a plurality of voltage levels, and the remaining full-nets above the conventional one are different and related, and the full-net concept is not particularly described below.
And then, calculating the theoretical line loss level of the representative day, wherein the theoretical line loss level difference rate K of the power grid of the region to be evaluated is adopted to embody the theoretical line loss level of the power grid of the region to be evaluated. In order to obtain the theoretical line loss level difference rate K of the regional power grid to be evaluated, the power supply amount of each voltage level in a plurality of preset voltage levels and the total power supply amount of the whole network formed by the plurality of voltage levels on a representative day of the regional power grid to be evaluated need to be calculated preferentially, it is noted that the power supply amounts are all theoretical calculation values, and the theoretical line loss rate of the whole network formed by the plurality of preset voltage levels is calculated on the basis. In addition, it is necessary to calculate the theoretical line loss rates of the plurality of (each) voltage classes of the power grid of the region to be evaluated, which are the same as the plurality of voltage classes of the power grid of the region to be evaluated on the previous stage of the power grid of the region to be evaluated on the representative day, for example, if the plurality of voltage classes preset for the power grid of the region to be evaluated are 220kV, 110kV, 35kV, 10kV and 380V, then it is necessary to calculate 5 theoretical line loss rates of the power grid of the previous stage of the power grid of the region to be evaluated on the previous stage of the. It can be understood that the calculation of the theoretical line loss rate of the multiple voltage classes of the power grid of the upper-level region depends on the relevant data of the power grids of all regions in the range of the power grid of the upper-level region, so that when the theoretical line loss rate of the multiple voltage classes of the power grid of the upper-level region is calculated, if the theoretical line loss level of the power grid of a certain region in the range is evaluated in the later period, the data of the power grid of the certain region should be used as the data content of the theoretical line loss rate of the multiple voltage classes of the power grid of the upper-level region. The above calculation process is well known to those skilled in the art, and the calculation process may include steps of maintaining graphic parameters, performing regional power grid load actual measurement, acquiring service system data such as SCADA, and the like.
After the preparation work is finished, the calculation of the theoretical line loss level difference rate K of the power grid in the area to be evaluated is carried out, and the specific mode is that
Wherein α is the total grid power supply of the regional power grid to be evaluated, αiPower supply amount of i voltage class of the power grid of the region to be evaluated, β theoretical line loss rate of the whole power grid of the region to be evaluated, βiThe theoretical loss rate of the i-voltage grade line of the upper-level regional power grid of the regional power grid is to be evaluated.
To facilitate the explanation of how the theoretical line loss level difference rate K is calculated, the following description will be made by way of example. By taking the fact that the theoretical line loss level (the theoretical line loss level difference rate K) of the Bengbu region is calculated by full-aperture actual measurement in a small-load mode in 4-9 th of year 2015 of the Anhui province power grid as an example, the previous-level regional power grid of the Bengbu region power grid is the Anhui province power grid, and the Bengbu region power grid is also the previous-level regional power grid of 5 city counties power grids of Bengbu city, Fengyang county, Wuhe county, Huaiyuan county and Guzhen county. The preset voltage levels are calculated according to the theoretical line loss level difference rate of the mussel port area, the preset voltage levels are all the voltage levels of the mussel port area, namely 220kV, 110kV, 35kV, 10kV and 380V, other voltage levels obviously exist in the Anhui power saving network on the first level, but the preset voltage level does not include the voltage level higher than 220kV because the voltage level of the mussel port area power grid is not higher than 220 kV. By calculation, the correlation data is as follows:
TABLE 1 theoretical line loss ratio (%) -based on partial pressures (different voltage classes) in Bengbu area
Table 2 shows the local power supply (MWh) of the Nibituo area
Based on the above data, the calculation result of the theoretical line loss level difference rate K in the mussel port area is as follows:
TABLE 3 Difference Rate index calculation results
According to the calculation formula, the power supply amount α of 5 voltage levels preset in the mussel port areai(the voltage grades are from low to high) 3924.45MWh, 9617.3MWh, 9090.65MWh, 14921.43MWh and 17966.80MWh respectively, and the theoretical line loss rate β of the voltage grades (from low to high) corresponding to the power grid in Anhui provincei5.29, 2.36, 1.16, 0.68 and 0.30 respectively, and the total power supply in the mussel port area is 19584.24MWh, then,
the calculated value is 3.551, and the theoretical line loss difference rate K of the entire net of the mussel port area power grid is 3.92, so that the theoretical line loss level difference rate K of the mussel port area power grid can be calculated to be 1.10.
It can be understood that, based on the above data content, the theoretical line loss level difference rate K of the mussel port region as the upper-level regional power grid, the mussel port city power grid, the phoenix yang county power grid, the wuhe county power grid, the huaiyuan county power grid, and the guzhen county power grid within the mussel port region range can be calculated in the same manner, although when the theoretical line loss level difference rate K is calculated for 5 city and county power grids, a plurality of preset voltage levels are not completely consistent (except for the mussel port city power grid, the two preset voltage levels do not have 2 voltage levels of 220kV and 110kV), but the theoretical line loss level difference rate K calculation of each regional power grid is not affected at all.
In order to facilitate understanding of the technical scheme of the invention, a comparative description will be made below by combining a line loss level evaluation method based on power grid characteristic difference proposed by the power science research institute of power companies in Jiangsu province in the background art.
In the evaluation method of the power science research of the shops in Jiangsu province, a power transformation level index concept is provided to evaluate the level of the line loss, and the power transformation level index is specifically expressed as a power transformation level index
It also employs multiple voltage levels, where QiThe average value of the i voltage class theoretical line loss rate of all the next-level regional power grids in the regional power grid range to be evaluated, AiThe power supply amount of each voltage grade of the power grid of the area to be evaluated is obtained, and A is the total power supply amount of the power grid of the area to be evaluated). Combining the data contents of the above tables 1 and 2, the index Y of the power transformation level of the Unionian areaBDThe calculation results are as follows:
TABLE 4 calculation results of power transformation hierarchy indexes
Performing transformation level index Y for mussel port areaBDThe multiple voltage levels adopted by calculation are also 220kV, 110kV, 35kV, 10kV and 380V, Q1 is the average value 5.09 of theoretical line loss rates 5.09, 5.14, 5.27, 5.95 and 5.10 corresponding to 380V voltage levels of 5 city and county regional power grids at the next level of the Union-Jack regional power grid, Q2, Q3, Q4 and Q5 respectively correspond to the theoretical line loss rates of 10kV, 35kV, 110kV and 220kV voltage levels of 5 city and county regional power grids at the next level of the Union-Jack regional power gridThe average value of the rate is combined with the power supply quantity of each voltage grade in the mussel port area and the power supply quantity of the whole network, and then the transformation level index Y in the mussel port area is calculatedBD＝3.65。
From the above calculation results, the power transformation level index of the mussel port area
And in this patent
The same in the two calculation formulas is that the power supply of each voltage class in the mussel port area and the total power supply of the whole network are adopted, but there are many differences:
a) the power transformation level index is the mussel port area whole network theoretical line loss rate, and is a result obtained by calculation through an index formula, wherein the result is 3.65; the total network line loss rate of the mussel port area in the difference rate index is obtained through the previous theoretical calculation and is adopted as a known value, and the non-index formula is calculated to be 3.92;
b) the theoretical line loss rate of each voltage grade of the Unionian region adopted by the power transformation hierarchy index is the arithmetic average of the theoretical line loss rates of the voltage grades of the power grids of the prefectural and county regions, and has no relation with the theoretical line loss rate of the provincial power grid of Anhui province; the theoretical line loss rate of each voltage grade of the Unionian area adopted in the difference rate index is the theoretical line loss rate of the voltage grade of the Anhui power grid obtained by the Anhui province theory calculation, so although the two index formulas are
And
very similar, but the meaning of the actual calculation result is completely different;
c) when the theoretical line loss rate of a certain voltage level is calculated by the substation level index, if the power grid of the district (next level) does not have the power grid of the same level (the power grids of the Fengyang county, the Wuhe county, the Huaiyuan county and the fixed town county do not have 220kV and 110kV), how to calculate the theoretical line loss rate is not explained, and if the theoretical line loss rate is added and divided by the number of the power grids of the next level of the district, the calculated theoretical line loss rate is smaller, and the calculation result is influenced finally; the difference rate index does not need to consider the problems, and the index can be calculated for any primary power grid.
From a further summary of the principle, it follows that:
1. the method comprises the steps of calculating the theoretical line loss level of a next-stage power grid by using the average theoretical line loss level of the previous-stage power grid, and calculating the line loss rate of the previous-stage power grid by using the arithmetic average of the line loss of the next-stage power grid;
2. although both methods are applied to the evaluation of the line loss level of each regional power grid, the calculation methods are quite different, and a provincial power grid (the regional power grid to be evaluated is the next regional power grid of the provincial power grid) is taken as an example:
(1) aiming at theoretical calculation, on the basis of actual measurement carried out on power grids of city and county companies, line loss theoretical calculation is carried out to obtain voltage grades and whole grid results of provincial power grids and regional power grids of the lower jurisdiction (the next level), actual difference degrees are verified by comparing the theoretical line loss of the whole grid of the regional power grids with the average level of the whole province, and the method specifically comprises the following steps: the theoretical line loss rate of each voltage class of the provincial power grid is used as a benchmark value of the corresponding voltage class of all the power grids of the prefectural areas, the voltage class power loss is obtained through the voltage class power supply quantity of the power grids of the prefectural areas, then the voltage class power loss is superposed to obtain the whole power loss quantity of the power grids of the prefectural areas, the theoretical line loss rate of the whole power grids of the prefectural areas is obtained by dividing the whole power loss quantity by the whole power supply quantity of the power grids of the prefectural areas, then the theoretical line loss rate is compared with the theoretical line loss rate of the whole power grids of the prefectural areas, the obtained result is subjected to theoretical line loss level differentiation, and the value is considered from the theoretical line loss average level of the whole provincial areas;
(2) the evaluation method proposed by the institute of Electrical science of electric Power, Utility, and province of Jiangsu province is an arithmetic mean value calculated from theoretical line loss rates of the same voltage class of the grids in each city and county area within the jurisdiction of a regional grid (the next level), and the arithmetic mean value is used as the theoretical line loss rateObtaining the loss electric quantity of the regional power grid at the voltage level by multiplying the theoretical line loss rate of the voltage level of the regional power grid by the power supply quantity of the voltage level, and so on to obtain the loss electric quantity of each voltage level of the regional power grid, summing to obtain the loss electric quantity of the whole power grid, and dividing the loss electric quantity of the whole power grid of the region by the power supply quantity of the whole power grid of the region to further obtain the line loss rate Y of the whole power grid of the regional power grid of the region of the cityBDAnd (namely, the transformation level index) on the basis, the index of the power grid in each region is measured and examined.
By the method for calculating the theoretical line loss level of the area to be evaluated, the theoretical line loss level difference rate K is obtained, and the theoretical line loss levels of a plurality of area power grids to be evaluated in the same upper-level area power grid range can be evaluated. For better illustration of the present invention, the following description will be made by taking 2015, 4, month and 9 as examples, and the relevant measured data are as follows:
table 5 represents the power supply quantity of each voltage class of the power grid in each daily area to be evaluated and the theoretical line loss rate of the whole power grid
Table 6 shows theoretical line loss rates (%) -of voltage levels of grids of RiAnhui province
| Region of land | 220kV | 110kV | 35kV | 10kV | 380V |
| Anhui province | 0.30 | 0.68 | 1.16 | 2.36 | 5.29 |
First, the difference rate index k of the grid in each city region can be calculated according to the data.
Table 7 shows the difference rate in the grid region in Ri' an Hui province (%)
| Region of land | Κ |
| Holy basil | 0.700 |
| Mixed fertilizer | 0.736 |
| Fuyang (Fuyang) | 0.891 |
| Huainan | 0.895 |
| Xuan city | 0.909 |
| Maanshan (Maanshan) | 0.972 |
| Huaibei | 0.982 |
| Mount Huang | 0.988 |
| Chuzhou province | 1.002 |
| Turnip lake | 1.011 |
| Pozhou province | 1.077 |
| Mussel port | 1.104 |
| Bozhou nationality | 1.217 |
| Dormitory states | 1.276 |
| Liu' an (six safety) | 1.319 |
| Anqing | 1.350 |
Based on the foregoing explanation of the principle of the present invention, in a plurality of regional power grids to be evaluated, the smaller the difference rate K of the theoretical line loss level of the regional power grid to be evaluated, the better the theoretical line loss level of the regional power grid to be evaluated, and the theoretical line loss level of the regional power grid to be evaluated, in which the difference rate K of the theoretical line loss level is less than 1, is superior to the average theoretical line loss level of the power grid in the upper stage. From the k values calculated above, it can be judged that: the theoretical line loss level of the power grid in the copper cemetery area is the best, the theoretical line loss levels of the power grids in the areas such as copper cemetery, compost, Fuyang, Huainan, Xuancheng, Maanshan, Huaibei and Huangshan are all superior to the average level of Anhui province, the theoretical line loss level of the power grid in the Chuzhou area is basically at the average level of Anhui province, and the theoretical line loss levels of the areas such as Wenhu, Chizhou, Anhui, Bozhou, dorzhou, Hexaan and Anqing are lower than the average level of Anhui province.
It can be understood that the theoretical line loss level difference rates K of the power grids of a plurality of regions to be evaluated are different in most cases, and the theoretical line loss level of one region power grid is considered to be superior to that of another region power grid by simply performing numerical comparison, so that certain problems exist in implementation work. Therefore, in the invention, for the power grid of the region to be evaluated, the difference value of the theoretical line loss level difference rate K is less than 0.1, the two power grids of the region are directly considered to be at the same theoretical line loss level; if one interval only contains one region, the interval is classified into adjacent intervals for comparison. With reference to table 8, the minimum value of K in each region in 2015 is 0.7, the maximum value is 1.35, the difference is large, the K value needs to be further refined to facilitate comparison in regions with the same theoretical line loss level, and the specific method comprises the following steps: k is less than or equal to 1 (superior to the average theoretical line loss level of the power grid in the previous level area), and each area is divided into three intervals according to K which is more than or equal to 0.7 and less than 0.8, K which is more than or equal to 0.8 and less than 0.9 and less than or equal to 1.0, and K which is more than 1 (lower than the average theoretical line loss level of the power grid in the previous level area) and each area is divided into four intervals according to K which is more than 1.0 and less than 1.1, K which is more than or equal to 1.1 and less than 1.2, K which is more than; by taking K to be less than or equal to 1 as an example, the holy and the compound fertilizer are both in an interval of K being more than or equal to 0.7 and less than 0.8, are the same theoretical line loss level, and are more reasonable and comparable when further comparison is carried out; when K is more than 1, only the mussel port is present in the interval of 1.1-1.2, and the mussel ports can be classified into the interval of 1.0-1.1 or 1.2-1.3 for comparison.
For a plurality of power grids of the regions to be evaluated, which are considered to be at the same theoretical line loss level, the theoretical line loss levels of the power grids of the regions to be evaluated can be evaluated in an auxiliary mode by acquiring the theoretical line loss level difference rate K representing the same day of the past year and the theoretical line loss level difference rate K of the power grids of the regions to be evaluated in the same day of the past year. The simpler operation is that the theoretical line loss level of the power grid in the region to be evaluated is better when the difference rate of the theoretical line loss level is larger relative to the negative growth value on the same day of the same year in the same year.
In this second step, the differences are calculated on a homographic basis using the average level of Anhui province as a boundary, in combination with the k values on the same day of the last year (9 days 4/2014), and the results are as follows.
Table 8 shows the results of the same comparison of the difference rate indexes of the respective regions of the day
The second step provides a method for evaluating the performance of the areas in the same horizontal interval: the theoretical line loss descending amplitude of the region in the same interval is calculated by carrying out the same proportion, and the region with large descending amplitude (large negative increasing amplitude) is considered to be superior to the region with small descending amplitude, thereby being beneficial to line loss management personnel to carry out detailed and differentiated evaluation. By taking K less than or equal to 1 as an example for explanation, the theoretical line loss level difference rate of the holy and the compound fertilizer (at the same theoretical line loss level) is the same as each other, and the negative growth value (-0.037) of the holy is greater than the negative growth value (-0.010) of the compound fertilizer, so that the theoretical line loss level of the holy is considered to be superior to that of the compound fertilizer; when K is more than 1, the Chuzhou, the turnip lake and the pond are all in the interval of 1.0 < K < 1.1, and the growth value is Chuzhou (-0.092) > the turnip lake (-0.001) > the pond (0.082), so that the theoretical line loss level in the interval is the best Chuzhou, the turnip lake is centered and the pond is the worst.
Since the 220kV metering port of the city company is on the high-voltage side of the main transformer, only the loss of the 220kV transformer is considered in the theoretical calculation of the line loss, and the comparison result in table 8 is described below from the parameter indexes such as the transformer capacity and the line length.
The following table shows that three city companies with approximate whole-network power supply levels on the actual measurement representative day are selected for comparison, wherein the difference rate index K of the power network in the copper region and the power network in the Huainan region is superior to the average level of the Anhui province, and the power network in the Anhui region is lower than the average level of the Anhui province. In the listed actual measurement data indexes of 110kV to 10kV, no matter from K value or delta, the grid structure of the power grid in the region of the ground city in front of the sequence is superior to that of the power grid in the region of the region behind the sequence, such as indexes of average capacity of a transformer, average length of a line and the like, and the implementation effectiveness of the index judgment method is demonstrated.
TABLE 9
The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. In general, all changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (9)
1. A theoretical line loss level calculation method based on measured operation parameters of a regional power grid is characterized by comprising the following steps:
1) presetting a plurality of voltage grades for evaluating the theoretical line loss level of the regional power grid for the regional power grid to be evaluated, and selecting a representative day for performing theoretical line loss calculation;
2) calculating the power supply quantity of a plurality of preset voltage levels of the regional power grid to be evaluated on a representative day, the power supply quantity of the whole power grid and the theoretical line loss rate of the whole power grid, wherein the power supply quantity of the whole power grid is formed by the voltage levels,
3) calculating theoretical line loss rates of a plurality of voltage grades of the power grid of the area to be evaluated on the last level of the representative day, wherein the voltage grades are the same as the plurality of voltage grades;
4) calculating the theoretical line loss level difference rate K of the power grid in the area to be evaluated;
and the theoretical line loss level difference rate of the power grid in the area to be evaluated
Wherein α is the total grid power supply of the regional power grid to be evaluated, αiThe power supply quantity of i voltage class of the power grid of the region to be evaluated is obtained, and β is the theoretical line loss rate of the whole power grid of the region to be evaluated，βiThe theoretical loss rate of the i-voltage grade line of the upper-level regional power grid of the regional power grid is to be evaluated.
2. The method for calculating the theoretical line loss level based on the measured operating parameters of the regional power grid according to claim 1, wherein the method comprises the following steps: the preset voltage grades are all voltage grades of the power grid of the area to be evaluated.
3. The method for calculating the theoretical line loss level based on the measured operating parameters of the regional power grid according to claim 1, wherein the method comprises the following steps: the preset plurality of voltage levels include: 220kV, 110kV, 35kV, 10kV and 380V.
4. The method for calculating the theoretical line loss level based on the measured operating parameters of the regional power grid according to claim 1, wherein the method comprises the following steps: the power grid of the region to be evaluated is a local-city-level power grid, and the power grid of the previous level is a provincial-level power grid.
5. A theoretical line loss level evaluation method based on regional power grid actual measurement operation parameters is characterized by comprising the following steps: the method for calculating the theoretical line loss level based on the measured operation parameters of the regional power grid, according to any one of claims 1 to 4, is adopted to calculate the theoretical line loss level difference rate K of the plurality of regional power grids to be evaluated within the same upper-level regional power grid range, wherein the smaller the theoretical line loss level difference rate K is, the better the theoretical line loss level of the regional power grids to be evaluated is.
6. The theoretical line loss level evaluation method based on the measured operation parameters of the regional power grid according to claim 5, characterized in that: and the theoretical line loss level of the power grid of the region to be evaluated, with the theoretical line loss level difference rate K less than 1, is superior to the average theoretical line loss level of the power grid of the previous region.
7. The theoretical line loss level evaluation method based on the measured operation parameters of the regional power grid according to claim 5, characterized in that: and regarding the power grid of the area to be evaluated, of which the difference value of the theoretical line loss level difference rate K is less than 0.1, the power grid is considered to be at the same theoretical line loss level.
8. The theoretical line loss level evaluation method based on the measured operation parameters of the regional power grid according to claim 7, characterized in that: and for a plurality of power grids of the area to be evaluated, which are considered to be at the same theoretical line loss level, acquiring theoretical line loss level difference rate K representing the same day of the previous year, and evaluating the theoretical line loss levels of the power grids of the areas to be evaluated according to the theoretical line loss level difference rate K of the same day of the previous year.
9. The theoretical line loss level evaluation method based on the measured operation parameters of the regional power grid according to claim 8, characterized in that: the same day of the past year of the representative day is the same day of the previous year of the representative day, and the theoretical line loss level of the power grid in the region to be evaluated is better when the difference rate of the theoretical line loss level is larger relative to the negative increase value of the same day of the previous year.
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