CN111244977B - Three-phase unbalanced load grading iteration adjustment method based on low-voltage distribution network - Google Patents
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Abstract
The invention provides a three-phase unbalanced load grading iterative adjustment method based on a low-voltage distribution network, which divides n users into m primary sets p with only a few users according to the line binding condition, the electrical distance of the users and the inseparable condition among the usersjFor the primary set pjThe power consumption analysis of internal users is carried out, the three-phase unbalance degree is taken as the standard, the power consumption is distributed to A, B, C three phases, and a primary set p is formedjThe inner three phases are kept in balance. Each level is collected to pjThe three-phase imbalance degree is taken as a standard as an integral body, and the integral body is merged into a secondary set p', and iteration is carried out according to the hierarchy, so that the whole platform area is in a three-phase equilibrium state finally. The method is suitable for adjusting and optimizing the three-phase unbalanced load of the power distribution network, and can solve the problems that the power distribution network is complex in line binding, power consumers are complicated and are not easy to plan, and part of the power consumers are not separable.
Description
Technical Field
The invention belongs to the technical field of three-phase unbalanced optimization phase commutation, and particularly relates to a three-phase unbalanced load grading iterative adjustment method suitable for a low-voltage power distribution network.
Background
The low-voltage distribution network has the characteristics of large quantity and wide range, and low-voltage user loads are mostly single-phase, and three-phase load asymmetry causes the unbalanced extensive existence of three-phase, and still exist at traditional low-voltage distribution network because of the serious inequality of three-phase load that early installation is improper, use high-power mechanical equipment etc. to cause, the unbalanced serious problem of three-phase makes the circuit ageing accelerate, distribution transformer loss aggravation has the hidden danger that causes the circuit trouble, serious consequences such as resident's power consumption difficulty.
The existing three-phase unbalanced commutation optimization method is based on the electricity utilization information of all users in a distribution room, classifies all users in the distribution room, aims at minimizing the three-phase unbalance degree, and modulates the phase of the users, so as to achieve the relative balance of three phases. However, the phenomena of crossed and disordered binding of lines, complicated and careless planning of power consumers, inseparability among part of power consumers and the like often exist in the power distribution network, so that the existing three-phase imbalance optimization method is difficult to popularize and implement. Therefore, the practical and effective three-phase unbalanced load adjustment method for the power distribution network is provided, the load phase change optimization of the low-voltage power distribution network can be performed rapidly and orderly, and the method has wide and common significance.
Disclosure of Invention
The invention discloses a three-phase unbalanced load grading iterative adjustment method based on a low-voltage power distribution network, which is an innovative method aiming at the problems that the scheme defects can be faced when the existing three-phase unbalanced phase change method of the low-voltage power distribution network is actually applied, the lines are crossed and bundled disorderly, power users are complicated and are not easy to plan, and part of users cannot be separated.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
s1, mixing n in a station areaiEach power consumer is divided into m primary sets pj，i＝1、2…n，j＝1、2…m，pjContaining alphajAn electric power consumer, then alpha1+...αmN for all users in the station areaiThe power consumption data of each primary set p is sampled by taking the minimum unbalance of three phases as a targetjThe internal users carry out commutation optimization to ensure that each primary set pjThe internal maximum degree reaches a three-phase balance state;
s2, using the phase-change optimized primary set as a three-phase user, m ″rThree-phase users are connected to form a two-level set p ″tT is 1 and 2 … m', so that the electrical distance between three-phase users in the same secondary set is minimum, and the unbalance degree of the three phases is minimum;
and S3, repeating S2, further merging the secondary set into the tertiary set, and iterating step by step in the way to enable a larger area in the transformer area to reach a three-phase balance state, finally enabling three phases in each primary set to be balanced, and enabling the whole transformer area to be in the three-phase balance state.
Preferably, S1 includes the steps of:
s11, surveying the line laying connection condition in the distribution area, finding out users connected to each telegraph pole distribution box, and establishing a power topological graph in the distribution area;
s12, dividing n users in the distribution area into m primary sets according to the established power topological graph in the distribution area, wherein each primary set meets the condition that the power users are close to each other in electrical distance;
s13, sampling the electricity consumption data of all the electricity consumers in the distribution area within one month, averaging the electricity consumption of one month, and recording as the n number of the consumersiThe daily electricity consumption data is used as the basis for adjusting commutation calculation;
s14, in each primary set, according to each power consumer niThe daily electricity consumption data of the system is obtained by averagely allocating each user to A, B, C three phases by taking the minimum unbalance degree of the three phases as a target;
wherein g represents pjUnbalance of aggregate distribution line, Q being pjAlpha in the setjThe sum of the power consumption of each phase after the three phases are allocated to each user, QAIs pjAlpha in the setjThe sum of the A phase power consumption and Q after the three phases are allocated by each userBIs pjAlpha in the setjThe sum of the B phase power consumption and Q after the three phases are allocated by each userCIs pjAlpha in the setjThe sum Q of the C phase power consumption after the individual user is allocated to the three phasesaveIs QA、QB、QCAverage number of (2), QmaxIs QA、QB、QCMaximum value of (2).
Preferably, S2 includes the steps of:
s21, classifying all the first-level sets p into three types, namely, the A-phase electric quantity value is higher than the other two phases, the B-phase electric quantity value is higher than the other two phases, and the C-phase electric quantity value is higher than the other two phases according to the three-phase electric quantity values;
s22, classifying, collecting and integrating the primary sets, marking the primary sets in a circuit topological graph, and marking the electrical distance as the distance of the telegraph pole distribution box among the primary sets;
s23, respectively adding m ″rThe primary sets p belonging to three types respectively are merged into m ' secondary sets p ' by taking the minimum electrical distance and the minimum three-phase unbalance degree of each secondary set p ' as the standardt(t ═ 1,2 … m');
∑m`r＝m(r＝1、2......m`)
wherein q isAFinger ptSum of all the first-level sets A phase electricity consumption and qBFinger ptSum of all the phase B electricity consumptions in the first-level set, qCFinger ptSum of all the C phase power consumptions in the first-level set, qmaxRefers to the secondary set ptMaximum of three-phase electricity consumption in medium A, B, C, qminFinger ptThe smallest of three-phase electricity consumption in middle A, B, C, qaveFinger ptAverage value of three-phase electricity consumption in A, B, C;
after the secondary adjustment, each primary set p is merged into a secondary set, and m 'secondary sets p' all reach a three-phase balance state.
Preferably, when the three-phase imbalance adjustment optimization is carried out, the power users with the closer electrical distance and the power users bundled together are regarded as a primary set, and then the phase change is optimized in the primary set; in the step-by-step iteration of each level of sets, the low three-phase unbalance degree of each set needs to be ensured, and the electrical distance between all power users is small, so that a regional three-phase balance is formed, the line loss is reduced, and the optimization feasibility can be increased.
Preferably, the lambda-th stage three-phase imbalance optimization has the sets in the lambda-1 stage all merged into the lambda stage set as a completion criterion.
Compared with the prior art, the invention has the following advantages:
1) the phase modulation method of hierarchical iteration is adopted, the method is suitable for the situation that distribution lines are regionalized and part of users are inseparable, and the method can be popularized and implemented in a large area;
2) by adopting the method of grading phase modulation, the local and overall three-phase balance of the transformer area can be realized simultaneously, the line loss is greatly reduced, the voltage stability is increased, and the power quality is improved.
The attached drawings illustrate
Fig. 1 is a flow chart of a three-phase unbalanced load grading iterative adjustment method for a power distribution network;
fig. 2 shows a three-phase imbalance broken line diagram of a three-phase imbalance curve of each 10 days before and after the stage-by-stage iterative adjustment.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
As shown in fig. 1, the technical scheme adopted by the invention is as follows:
s1, setting n in a distribution roomi(i ═ 1,2, … n) power consumers, the consumers whose lines are bound together and whose electrical distances are close or inseparable are taken as a set, and divided into m primary sets pj(j＝1,2,…m)，pjEach containing alphajAn electric power consumer, then alpha1+...αmN. For all users n in the platform areaiThe power consumption data of each primary set p is sampled with the aim of minimizing the three-phase unbalancejEach user inside carries out commutation optimization to ensure that each primary set pjThe three-phase equilibrium state is reached to the maximum degree, and each primary set is regarded as oneCarrying out next adjustment and optimization on three users;
s11, surveying the line laying connection condition in the distribution area, finding out the users connected to each telegraph pole distribution box, and establishing a power topological graph in the distribution area;
and S12, dividing the n users in the distribution area into m primary sets according to the established power topological graph in the distribution area, wherein each primary set is required to meet the condition that the power users are close to each other in electrical distance (powered by the same telegraph pole distribution box or the close telegraph pole distribution boxes).
S13, sampling the electricity consumption data of all the electricity consumers in the distribution area within one month, averaging the electricity consumption of one month, and recording as the n number of the consumersiThe daily electricity consumption data is used as the basis for adjusting commutation calculation;
s14, in each primary set, according to each power consumer niThe daily electricity consumption data of the system is obtained by averagely allocating each user to A, B, C three phases by taking the minimum unbalance degree of the three phases as a target;
wherein g represents pjUnbalance of aggregate distribution line, Q being pjAlpha in the setjThe sum of the power consumption of each phase after the three phases are allocated to each user, QAIs pjAlpha in the setjThe sum of the A phase power consumption and Q after the three phases are allocated by each userBIs pjAlpha in the setjThe sum of the B phase power consumption and Q after the three phases are allocated by each userCIs pjAlpha in the setjThe sum Q of the C phase power consumption after the individual user is allocated to the three phasesaveIs QA、QB、QCAverage of (1), QmaxIs QA、QB、QC(iv) maximum value of (d);
adjusted primary setpjThe internal three phases are basically kept balanced, and each primary set pjCan be regarded as an inseparable whole, namely a three-phase user; after the primary adjustment, the three-phase balance state of each primary set, namely each small area in the station area, is maximally achieved.
S2, using the adjusted primary set as a three-phase user, m ″rThe three-phase users are connected to form a secondary set p ″t(t ═ 1,2 … m'), the electrical distance between three-phase users in the same secondary set is minimized, and the unbalance degree of the three phases is minimized;
s21, classifying all the first-level sets p into three types, namely, the A-phase electric quantity value is higher than the other two phases, the B-phase electric quantity value is higher than the other two phases, and the C-phase electric quantity value is higher than the other two phases according to the three-phase electric quantity values;
s22, classifying, collecting and integrating the primary sets, marking the primary sets in a circuit topological graph, and marking the electrical distance as the distance between the telegraph poles and the distribution boxes or the distance between lines among the primary sets;
s23, respectively adding m ″rThe primary sets p belonging to three types respectively are merged into m ' secondary sets p ' by taking the minimum electrical distance and the minimum three-phase unbalance degree of each secondary set p ' as the standardt(t ═ 1,2 … m');
∑m`r＝m(r＝1,2…m`)
qAthe sum of all the phase A electricity consumptions of the first-level set and qBThe sum of all the phase B electricity consumptions of the first-level set and qCThe sum q of all the C phase electricity consumption of the first-level setmaxRefers to the secondary set piMaximum of three-phase electricity consumption in medium A, B, C, qminFinger ptThe smallest of three-phase electricity consumption in middle A, B, C, qaveFinger ptAverage value of three-phase electricity consumption of medium A, B, C
After the secondary adjustment, all the primary sets p are merged into the secondary sets, and m 'secondary sets p' reach threeThe phase balance state is that a larger area formed by small areas where all the primary sets are located in the transformer area generally reaches a three-phase balance state; adjusted secondary set p ″iBut also can be used as an integral whole, namely a larger three-phase user;
and S3, repeating S2, further merging the secondary set into the tertiary set, and iterating step by step in the way, so that each larger area in the primary set continuously reaches a three-phase balance state, and finally, the three phases in each primary set are balanced, and the whole station area is in the three-phase balance state. That is, the lambda-level three-phase imbalance optimization uses the sets in the lambda-1 level all incorporated into the lambda level set as the completion criteria.
In the embodiment of the present invention, an example of 181 power consumers in a cell to be adjusted is described.
S1, connecting all the power users n in one distribution network areai(i ═ 1,2, … 181) 181 in total are divided into a plurality of primary sets. The line connection was found by field investigation. The 181 users are bound together, 87 power users are not separated, 20 non-separated phase modulation objects are formed by binding, and the other 94 power users are close to the 20 binding according to the electrical distance, so that the users in each cell are taken as a primary set and are divided into 22 primary sets. And extracting the continuous 10-day electricity consumption data of all 181 electricity consumers in the distribution area, and averaging the 10-day electricity consumption data and recording the electricity consumption characteristic data of the electricity consumers as a basis for phase change calculation. In each primary set, the power consumers are equally distributed to A, B, C three phases according to the power consumption characteristic data of all the power consumers in the primary set, so that the sum of the total power consumption characteristic data of A, B, C three-phase consumers is basically equal. Therefore, three-phase unbalanced commutation optimization in each primary set is completed, three phases in each primary set are basically balanced, the 22 primary sets are regarded as 22 unsegmentable three-phase users, and the next adjustment is carried out.
S2, using the adjusted primary set as a three-phase user, m ″rThe three-phase users are connected to form a secondary set p ″t( t 1,2 … 5) in the same secondary setThe electrical distance between three-phase users is minimum, and the unbalance degree of the three phases is minimum;
s21, collecting all the primary levels pjThe three-phase electric quantity values are classified into three types, namely that the electric quantity value of the phase A is higher than that of the other two phases, the electric quantity value of the phase B is higher than that of the other two phases, and the electric quantity value of the phase C is higher than that of the other two phases. According to the three-phase electricity consumption data of each primary set A, B, C, in 22 primary sets, the electric quantity value of the phase A is higher than that of the other two phases, 9 primary sets are provided, the electric quantity value of the phase B is higher than that of the other two phases, 7 primary sets are provided, and the electric quantity value of the phase C is higher than that of the other two phases, 6 primary sets are provided.
S22, classifying, collecting and integrating the primary sets, marking the primary sets in a circuit topological graph, and marking the electrical distance as the distance between the telegraph poles and the distribution boxes or the distance between lines among the primary sets;
s23, according to the actual situation, merging 22 primary sets p belonging to three types into 5 secondary sets p' respectively according to the standard of minimum electrical distance and minimum three-phase unbalance degree of each secondary set pt(t-1, 2 … 5). Therefore, the three-phase unbalance degree in the area respectively contained by the 5 secondary sets of the platform area reaches the lowest level.
And S3, directly merging the five secondary sets into the main distribution network of the distribution area, finishing phase change optimization, and reducing the unbalance degree of the three phases in the distribution area to the lowest level.
In the embodiment, the number of power users in the platform area is not too large, the electrical distance is not too far, the phase change optimization of the platform area is only divided into two stages for step-by-step optimization, for more complex cases, the optimization process can be divided into multiple stages according to the method, and after step-by-step adjustment, the local and overall three-phase balance of the platform area is realized.
Part of data in this example: and averaging the collected ten-day data to obtain the characteristic values of the power consumption of the users, wherein the characteristic values of the power consumption of part of the users are shown in a table 1, the users are modulated into three phases in each primary set according to the characteristic values of the power consumption, and the condition of the phase of the users in the part of the primary sets is shown in a table 2.
Table 1 part of characteristic values kw.h of electricity consumption of users
Table 2 partial primary set includes users and their phases
The three-phase unbalance degree curve of each 10 days before and after the whole transformer area is adjusted in a grading and iteration mode is shown in figure 2. It can be seen that through three-phase unbalance adjustment of grading iteration, the three-phase unbalance degree of the platform area is reduced to below 20% from about 40% originally, and the optimization effect is obvious.
The embodiment can prove that the three-phase imbalance adjusting method for load grading iterative adjustment, provided by the invention, can adapt to the condition that the power distribution network line is regionalized and part of users are inseparable, can obviously reduce the three-phase imbalance degree, can effectively reduce the line loss, improves the power quality of a transformer area, and has practical application value.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A three-phase unbalanced load grading iteration adjustment method based on a low-voltage distribution network is characterized by comprising the following steps:
s1, dividing n power users in one distribution area into m primary sets pj，i＝1、2…n，j＝1、2…m，pjContaining alphajAn electric power consumer, then alpha1+...αmN for all users in the station areaiThe power consumption data of each primary set p is sampled by taking the minimum unbalance of three phases as a targetjThe internal users carry out commutation optimization to ensure that each primary set pjThe internal maximum degree reaches a three-phase balance state; step S1 specifically includes the following substeps:
s11, surveying the line laying connection condition in the distribution area, finding out users connected to each telegraph pole distribution box, and establishing a power topological graph in the distribution area;
s12, dividing n users in the distribution area into m primary sets according to the established power topological graph in the distribution area, wherein the primary sets meet the condition that the power users in the primary sets are the same in electrical distance;
s13, sampling the electricity consumption data of all the electricity consumers in the distribution area within one month, averaging the electricity consumption of one month, and recording as the n number of the consumersiThe daily electricity consumption data is used as the basis for adjusting commutation calculation;
s14, in each primary set, according to each power consumer niThe daily electricity consumption data of the system is averagely allocated to A, B and C three phases of a low-voltage distribution network by taking the minimum three-phase unbalance degree as a target;
wherein g represents pjUnbalance of aggregate distribution line, Q being pjAlpha in the setjThe sum of the power consumption of each phase after the three phases are allocated to each user, QAIs pjAlpha in the setjThe sum of the A phase power consumption and Q after the three phases are allocated by each userBIs pjAlpha in the setjThe sum of the B phase power consumption and Q after the three phases are allocated by each userCIs pjAlpha in the setjIndividual userThe sum of the C phase power consumption and Q after being mixed into three phasesaveIs QA、QB、QCAverage number of (2), QmaxIs QA、QB、QCMaximum value of (1);
s2, using the phase-change optimized primary set as a three-phase user, m ″rThree-phase users are connected to form a two-level set p ″tT is 1 and 2 … m', so that the electrical distance between three-phase users in the same secondary set is minimum, and the unbalance degree of the three phases is minimum; step S2 specifically includes the following substeps:
s21, classifying all the first-level sets p into three types, namely, a type A phase with the electric quantity higher than those of a phase B and a phase C, a type B phase with the electric quantity higher than those of the phase A and the phase C, or a type C phase with the electric quantity higher than those of the phase A and the phase B;
s22, classifying, collecting and integrating the primary sets, marking the primary sets in a circuit topological graph, and marking the electrical distance as the distance of the telegraph pole distribution box among the primary sets;
s23, respectively adding m ″rThe primary sets p belonging to three types respectively are merged into m ' secondary sets p ' by taking the minimum electrical distance and the minimum three-phase unbalance degree of each secondary set p ' as the standardtWherein, t is 1,2 … m';
∑m`r＝m,r＝1、2......m`
qA＝∑qAf
qC＝∑qCf
wherein q isAFinger ptSum of all the first-level sets A phase electricity consumption and qBFinger ptSum of all the phase B electricity consumptions in the first-level set, qCFinger ptSum of all the C phase power consumptions in the first-level set, qmaxRefers to the secondary set ptMaximum of three-phase electricity consumption in medium A, B, C, qminFinger ptThe smallest of three-phase electricity consumption in middle A, B, C, qaveFinger ptOf medium-low voltage distribution networksA. B, C average value of three-phase electricity usage;
after secondary adjustment, each primary set p is merged into a secondary set, and m 'secondary sets p' reach a three-phase balance state; and
and S3, repeating S2, further merging the secondary set into the tertiary set, and iterating step by step to enable a larger area in the platform area to reach a three-phase balance state, finally enabling three phases in each primary set to be balanced, and enabling the whole platform area to be in the three-phase balance state.
2. The three-phase unbalanced load hierarchical iterative adjustment method based on the low-voltage distribution network as claimed in claim 1, wherein during the three-phase unbalanced adjustment optimization, the power consumers with closer electrical distances and the power consumers bundled together are used as a primary set, and then the phase change is optimized inside the primary set; in the step-by-step iteration of each level of sets, the low three-phase unbalance degree of each set needs to be ensured, and the electrical distance between all power users is small, so that a regional three-phase balance is formed, the line loss is reduced, and the optimization feasibility can be increased.
3. The three-phase unbalanced load grading iterative adjustment method based on the low-voltage distribution network according to claim 2, characterized in that the λ -th three-phase unbalanced optimization has the set in λ -1 grade all merged into the λ -grade set as a completion criterion.
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