CN111932139A - Multi-system power quality comprehensive horizontal ranking evaluation method - Google Patents
Multi-system power quality comprehensive horizontal ranking evaluation method Download PDFInfo
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Abstract
The invention relates to a multi-system power quality comprehensive level ranking evaluation method, and belongs to the field of power system analysis. The method comprises the following steps: 1) setting n monitoring points in the system, wherein the comprehensive power quality level of each monitoring point is PQiWherein i is 1,2, … n; 2) for each monitoring point, calculating: PQi，left＝PQi1, if PQi，leftIf less than 0, then PQ is assertedi，left0; 3) if all monitoring points PQ of the system are presenti，leftIf it is 0, the system power quality integrated index UPQI is equal to each monitoring point PQiMaximum value of (d); 4) if any monitoring point PQ of the systemiIf the power quality comprehensive index UPQI of the system is larger than 1, the power quality comprehensive index UPQI of the system is 1 plus each monitoring point PQi，leftSum/n; 5) if a total Num of systems are provided, the same method is adopted for each system k, wherein k is 1, and 2 … Num is adopted to obtain the power quality comprehensive index UPQI of each system kkWhich isK is 1,2 … Num, Num is the total number of the system; 6) according to UPQIkSorting the comprehensive levels of the power quality of the Num systems; UPQIkThe smaller the size, the higher the comprehensive level of the electric energy quality.
Description
Technical Field
The invention relates to an evaluation method, in particular to a multi-system power quality comprehensive level ranking evaluation method. Belongs to the field of electric power system analysis.
Background
With the continuous development of the requirement of the comprehensive management of the power quality, the traditional method only for evaluating the comprehensive indexes of the power quality of different monitoring points cannot meet the requirement of the power quality management, and in practice, the ranking evaluation of the comprehensive indexes of the power quality needs to be carried out aiming at different systems and different areas so as to judge the quality of the whole level of the power quality of different systems and different areas, thereby strengthening the comprehensive management of the power quality in a targeted manner.
At present, the first method adopted is a method for evaluating the probability large value of a single power quality index at the same voltage level, and the method is an evaluation method for evaluating the power quality index of a single index in a certain time span by almost always using the probability large value. The probability is large, namely the target value corresponding to a certain percentile: let the target value of the Xth percentile be Px, which divides the total observations into two parts, where X% of the observations are less than Px and (100-X)% of the observations are greater than Px. It is used primarily to describe the level of a set of data at various percentiles, represented by a set of percentiles such as P5, P25, P50, P75, P95, P99, P100. Generally, a probability maximum of 95% or more is used. The second method is to generalize multiple power quality comprehensive indexes by adopting an average value method at the same voltage level, namely: and averaging the quantization levels of different power quality indexes of the same voltage grade and the same monitoring point to obtain a comprehensive index. The third method is to adopt the maximum value method to induce multiple electric energy quality comprehensive indexes with the same voltage grade, namely: and obtaining a comprehensive index by taking the maximum value of the quantization levels of different power quality indexes at the same voltage level and the same monitoring point. The three methods can not realize comprehensive level sequencing evaluation of the power quality among multiple systems.
Disclosure of Invention
The method aims to overcome the defect that the traditional method cannot realize the evaluation and sequencing evaluation of the multi-system power quality hazard degree. The invention aims to provide a comprehensive level ranking evaluation method for multi-system power quality. The method can simplify data of all power quality monitoring points in the system according to the power quality hazard degree of the power quality monitoring points, so that a calculation method representing the only comprehensive power quality index of the system is obtained, and comprehensive evaluation and sequencing of the power quality of different systems is carried out according to the calculation method. Therefore, the problem of sorting evaluation of electric energy quality hazards of different systems is solved.
The technical scheme of the invention is as follows: the comprehensive level ranking evaluation method for the multi-system power quality comprises the following steps:
1) setting n monitoring points in the system, wherein the comprehensive power quality level of each monitoring point is PQiWherein i is 1,2, … n;
2) for each monitoring point, calculating: PQi，left＝PQi1, if PQi，leftIf less than 0, then PQ is assertedi，left＝0；
3) If all monitoring points PQ of the system are presenti，leftIf it is 0, the system power quality integrated index UPQI is equal to each monitoring point PQiMaximum value of (d);
4) if any monitoring point PQ of the systemiIf the power quality comprehensive index UPQI of the system is larger than 1, the power quality comprehensive index UPQI of the system is 1 plus each monitoring point PQi，leftSum/n；
5) If a total Num of systems are provided, the same method is adopted for each system k, wherein k is 1, and 2 … Num is adopted to obtain the power quality comprehensive index UPQI of each system kkWherein k is 1,2 … Num, Num is the total number of the system;
6) according to UPQIkSorting the comprehensive levels of the power quality of the Num systems; UPQIkThe smaller the size, the higher the comprehensive level of the electric energy quality.
Further, the power quality indicator of the integrated power quality level includes: voltage deviations, flicker, three-phase unbalances and harmonics.
Further, if each monitoring point PQiLess than 1, i.e. PQi，leftAnd if the value is 0, indicating that all monitoring points do not exceed the standard.
The invention has the beneficial effects that: the method can simplify data of all power quality monitoring points in the system according to the power quality hazard degree of the power quality monitoring points, so that a calculation method representing the only comprehensive power quality index of the system is obtained, and comprehensive evaluation and sequencing of the power quality of different systems is carried out according to the calculation method. By applying the method, the problem that sequencing evaluation between different systems according to the electric energy quality hazard degree cannot be realized at present is solved, and technical support is provided for carrying out comprehensive management on the electric energy quality in all directions.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. Terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. Such as: the terms referred to in the various embodiments of the invention are: PQ is Power Quality (PQ). PQi，leftMiddle "left" means the remainder, i.e., the portion exceeding 1.
Example 1
The comprehensive level ranking evaluation method for the multi-system power quality comprises the following steps:
1) there are n monitors in the systemThe integrated power quality level of each monitoring point is PQi(i＝1,2,…n)；
2) For each monitoring point, calculating: PQi，left＝PQi1, if PQi，leftIf less than 0, then PQ is assertedi，left＝0(i＝1,2,…n)；
3) If all monitoring points PQ of the system are presenti，leftWhen the value is 0(i is 1,2, … n), the system power quality integrated indicator UPQI is each monitoring point PQiMaximum value of (i ═ 1,2, … n);
if each point PQiLess than 1, i.e. PQi，leftWhen the values are 0(i is 1,2, … n), the points do not exceed the standard, and in this case, the monitor points PQ are all equal to one anotheriRepresents the most severe case of the system, and therefore: the integrated index UPQI is equal to each monitoring point PQiIs measured.
4) If any monitoring point PQ of the systemiIf the power quality comprehensive index UPQI of the system is larger than 1, the power quality comprehensive index UPQI of the system is 1 plus each monitoring point PQi，leftSum/n, (i ═ 1,2, … n);
here, "1" represents an over-standard, "each watch Point PQi，leftThe sum/n "represents the allocation of the superscalar portion to each watch point.
5) If a total Num of systems are provided, the same method is adopted for each system k, wherein k is 1, and 2 … Num is adopted to obtain the power quality comprehensive index UPQI of each system kkWherein k is 1,2 … Num, Num is the total number of the system;
6) according to UPQIkSorting the comprehensive levels of the power quality of the Num systems; UPQIkThe smaller the size, the higher the comprehensive level of the electric energy quality.
Further, the power quality indicator of the integrated power quality level includes: voltage deviations, flicker, three-phase unbalances and harmonics.
Further, assuming the criterion is 1, if PQi，left＝PQi-1 is less than 0, indicating no superscalar, otherwise superscalar, with different handling for subsequent steps that are superscalar or not superscalarA method. This embodiment is not described.
Example 2
Application scenario example
The system is provided with three systems, wherein the subsystem 1 comprises three monitoring points, the subsystem 2 comprises three monitoring points, and the subsystem 3 is formed by combining the subsystem 1 and the subsystem 2 and comprises 6 monitoring points.
For subsystem 1: PQ1,left＝0.8-1＝-0.2<0, order: PQ1,left＝0
PQ2,left＝1.8-1＝0.8>0, order: PQ2,left＝0.8
PQ1,left＝1.4-1＝0.4>0, order: PQ3,left＝0.4
Then: UPQI1＝1+(0.4+0.8)/3＝1.4
Also, for subsystem 2: UPQI2＝1.2
For subsystem 3, UPQI, consisting of subsystem 1+ subsystem 23＝1.27。
The electric energy quality indexes of the systems obtained by adopting the method are shown in table 1:
table 1: sequencing analysis result of comprehensive indexes of electric energy quality of three systems
In table 1, UPQI1 is 1.4, UPQI2 is 1.2, and UPQI3 is 1.27. Sorting by adopting the results: UPQI2<UPQI3<UPQI1The conclusion that the power quality of the subsystem 2 is the best, the power quality of the subsystem 1 is the worst after 3 times of the subsystem is explained as follows: the actual point of the subsystem 1 exceeds the standard (is more than 1), the actual point of the subsystem 2 exceeds the standard, and the power quality of the subsystem 2 is superior to that of the subsystem 1; subsystem 3 is made up of "subsystem 1+ subsystem 2", the power quality level of which must be between the two. This conclusion is in line with reality.
The method can simplify data of all power quality monitoring points in the system according to the power quality hazard degree of the power quality monitoring points, so that a calculation method representing the only comprehensive power quality index of the system is obtained, and comprehensive evaluation and sequencing of the power quality of different systems is carried out according to the calculation method. By applying the method, the problem that sequencing evaluation between different systems according to the electric energy quality hazard degree cannot be realized at present is solved, and technical support is provided for carrying out comprehensive management on the electric energy quality in all directions.
The steps and components of the present embodiments are not described in detail, but are generally known in the art and not described in detail herein.
Claims (3)
1. The comprehensive horizontal ranking evaluation method for the multi-system power quality is characterized by comprising the following steps: the method comprises the following steps:
1) setting n monitoring points in the system, wherein the comprehensive power quality level of each monitoring point is PQiWherein i is 1,2, … n;
2) for each monitoring point, calculating: PQi，left＝PQi1, if PQi，leftIf less than 0, then PQ is assertedi，left＝0；
3) If all monitoring points PQ of the system are presenti，leftIf it is 0, the system power quality integrated index UPQI is equal to each monitoring point PQiMaximum value of (d);
4) if any monitoring point PQ of the systemiIf the power quality comprehensive index UPQI of the system is larger than 1, the power quality comprehensive index UPQI of the system is 1 plus each monitoring point PQi，leftSum/n;
5) if a total Num of systems are provided, the same method is adopted for each system k, wherein k is 1, and 2 … Num is adopted to obtain the power quality comprehensive index UPQI of each system kkWherein k is 1,2 … Num, Num is the total number of the system;
6) according to UPQIkSorting the comprehensive levels of the power quality of the Num systems; UPQIkThe smaller the size, the higher the comprehensive level of the electric energy quality.
2. The multi-system power quality comprehensive level ranking evaluation method of claim 1, characterized by: the electric energy quality indexes of the comprehensive electric energy quality level comprise: voltage deviations, flicker, three-phase unbalances and harmonics.
3. The multi-system power quality comprehensive level ranking evaluation method of claim 1, characterized by: if each monitoring point PQiLess than 1, i.e. PQi，leftAnd if the value is 0, indicating that all monitoring points do not exceed the standard.
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