CN107230992B - Phase modulation method and device of unbalanced station area based on traversal phase modulation algorithm - Google Patents
Phase modulation method and device of unbalanced station area based on traversal phase modulation algorithm Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The application provides a phase modulation method and a phase modulation device of an unbalanced transformer area based on a traversal phase modulation algorithm, wherein the power distribution transformer area is divided into a plurality of subareas according to a line topology structure of the power distribution transformer area and positions of data acquisition points, and three-phase currents of all the subareas are acquired from the data acquisition points; calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm; and determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalance degree index of each phase modulation scheme and the adjustment of the wiring point proportion. Therefore, according to the technical scheme provided by the application, the three-phase current of the data acquisition point is used as a data base, the traversal phase modulation algorithm is used for determining at least one phase modulation scheme, the comprehensive unbalance degree index of each phase modulation scheme and the influence of the proportion of the adjusting connection point on the three-phase unbalance degree are considered, and the finally determined optimal phase modulation scheme can quickly and accurately guarantee the three-phase balance of the power distribution platform area.
Description
Technical Field
The invention relates to the technical field of power distribution, in particular to a phase modulation method and a phase modulation device of an unbalanced transformer area based on a traversal phase modulation algorithm.
Background
With the improvement of the construction of the extra-high voltage power grid, the running condition of the distribution network gradually becomes the key point of attention of people, and the problem of three-phase imbalance of the distribution area of the distribution network is paid more and more attention. On one hand, the loss of the distribution transformer is increased due to unbalanced three phases, and the zero sequence current is increased, so that the safe and stable operation of the distribution transformer is influenced; on the other hand, the loss of the distribution network line can be increased, so that the problems of high voltage and low voltage of a user are caused, and the quality of the power supply voltage of the user is influenced. Therefore, the treatment of the three-phase unbalance problem is very important.
In the prior art, a phase sequence adjustment method can be adopted to solve the problem of three-phase imbalance in a power distribution station area. The phase sequence adjustment, referred to as phase modulation for short, is to obtain and adjust the adjustment mode of users or branches by analyzing the change of three-phase load with time in a period of time of all users or branches in a platform area through a certain user adjustment algorithm, thereby achieving the goal of basic balance of three-phase load.
However, the existing phase modulation method for the unbalanced transformer area generally simply takes the three-phase unbalance degree within a qualified range as an adjustment target, and adopts the electric quantity accumulation of a user for a period of time as a data base to perform three-phase adjustment, and the influence of load change on the three-phase unbalance degree is not considered, so that the three-phase unbalance condition of the transformer area in a certain period of time may be more serious.
Disclosure of Invention
In view of this, the invention provides a phase modulation method and a phase modulation device for an unbalanced distribution area based on a traversal phase modulation algorithm, which can quickly and accurately ensure the three-phase balance of the distribution area.
In order to achieve the purpose, the invention provides the following technical scheme:
a phase modulation method of unbalanced station areas based on a traversal phase modulation algorithm comprises the following steps:
dividing a power distribution area into a plurality of subareas according to a line topological structure of the power distribution area and the positions of data acquisition points, and acquiring three-phase current of each subarea from the data acquisition points;
calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm;
and determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalance degree index of each phase modulation scheme and the adjustment of the wiring point proportion.
Preferably, the calculating at least one phase modulation scheme according to the three-phase current data of each of the partitions and a preset traversal phase modulation algorithm includes:
determining the three-phase current collected by each data collection point as three corresponding loads;
traversing the scheme of each load running on any phase, deleting the three schemes of the loads running on the same phase and the scheme of any two loads running on the same phase, and generating at least one phase modulation scheme.
Preferably, the determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive imbalance degree index of each phase modulation scheme and the adjustment of the ratio of the connection points includes:
calculating the unbalance degree of the three-phase current of the power distribution area corresponding to each phase modulation scheme at the acquisition time, and determining the comprehensive unbalance degree of the current of the power distribution area corresponding to each phase modulation scheme;
comparing each phase modulation scheme with the original wiring scheme of the power distribution area, and respectively calculating the ratio of the number of wiring points of each phase modulation scheme to be adjusted to all the number of wiring points to serve as the ratio of the adjusted wiring points of the power distribution area corresponding to each phase modulation scheme;
respectively calculating the adaptability value of each phase modulation scheme according to the comprehensive current unbalance degree corresponding to each phase modulation scheme and the adjustment wiring point proportion;
and sequencing at least one phase modulation scheme according to the fitness value, and determining the optimal phase modulation scheme from at least one phase modulation scheme.
A phase modulation apparatus for unbalanced regions based on a traversal phase modulation algorithm, comprising:
the acquisition module is used for dividing the power distribution area into a plurality of subareas according to the line topological structure of the power distribution area and the position of a data acquisition point, and acquiring the three-phase current of each subarea from the data acquisition point;
the calculation module is used for calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm;
and the determining module is used for determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalancedness index of each phase modulation scheme and the adjustment of the proportion of the wiring points.
Preferably, the calculation module includes:
the load unit is used for determining the three-phase current collected by each data collection point into three corresponding loads;
and the traversing unit is used for traversing the scheme of each load when the load runs on any phase, deleting the three schemes of the load when the load runs on the same phase and the scheme of any two loads when the load runs on the same phase, and generating at least one phase modulation scheme.
Preferably, the determining module includes:
the first calculation unit is used for calculating the three-phase current unbalance of the power distribution area corresponding to each phase modulation scheme at the acquisition time and determining the comprehensive current unbalance of the power distribution area corresponding to each phase modulation scheme;
the comparison unit is used for comparing each phase modulation scheme with the original wiring scheme of the power distribution area, and respectively calculating the ratio of the wiring points of each phase modulation scheme to be adjusted to all the wiring points to be used as the ratio of the adjusted wiring points of the power distribution area corresponding to each phase modulation scheme;
the second calculation unit is used for calculating the adaptability value of each phase modulation scheme according to the comprehensive current unbalance degree corresponding to each phase modulation scheme and the adjustment wiring point proportion;
and the determining unit is used for sequencing at least one phase modulation scheme according to the fitness value and determining the optimal phase modulation scheme from at least one phase modulation scheme.
According to the technical scheme, compared with the prior art, the phase modulation method and the phase modulation device for the unbalanced transformer area based on the traversal phase modulation algorithm divide the power distribution transformer area into a plurality of subareas according to the line topology structure of the power distribution transformer area and the positions of the data acquisition points, and acquire the three-phase current of each subarea from the data acquisition points; calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm; and determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalance degree index of each phase modulation scheme and the adjustment of the wiring point proportion. Therefore, according to the technical scheme provided by the application, the three-phase current of the data acquisition point is used as a data base, the traversal phase modulation algorithm is used for determining at least one phase modulation scheme, the comprehensive unbalance degree index of each phase modulation scheme and the influence of the proportion of the adjusting connection point on the three-phase unbalance degree are considered, and the finally determined optimal phase modulation scheme can quickly and accurately guarantee the three-phase balance of the power distribution platform area.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flowchart of a phase modulation method for unbalanced station areas based on a traversal phase modulation algorithm according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a phase modulation apparatus for unbalanced transformer areas based on a traversal phase modulation algorithm according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The embodiment of the invention discloses a phase modulation method of an unbalanced station area based on a traversal phase modulation algorithm, and please refer to the attached figure 1, wherein the method specifically comprises the following steps:
s101: dividing a power distribution area into a plurality of subareas according to a line topological structure of the power distribution area and the positions of data acquisition points, and acquiring three-phase current of each subarea from the data acquisition points;
in the embodiment of the application, the transformer area is partitioned according to the topological structure of the transformer area line and the position of the data acquisition point, and the three-phase current data of each partition in a preset time period is acquired according to a preset time interval; for example, when the table is divided into 3 partitions, and one three-phase current data is collected for 5 minutes per partition, 3 (partitions) × 3 (phases) × 288 (data/day) × 2592 data values can be collected one day.
Specifically, the preset time interval and the preset time period may be preset, and if the preset time interval is "30 minutes" and the preset time period is "7 days", the three-phase current data of the power distribution area is acquired every 30 minutes at the beginning, and the acquisition of all the three-phase current data generated by the power distribution area with the preset time period of "7 days" is completed until the acquisition times reach "336". The preset time period may also be one week, two weeks or one month.
In the embodiment of the present application, the unbalanced station area refers to a power distribution station area where a three-phase load imbalance problem has occurred, and the three-phase current data of the unbalanced station area mainly includes current data of three phases, i.e., a-phase current data, a B-phase current data, and a C-phase current data.
In addition, the acquired data can also comprise power data of each partition, phase sequence of each partition, whether each partition is adjustable or not, grouping condition of each partition, and the data is exported by a recorder in a fixed format, and the data can be preprocessed by deleting a time point with load lower than 30% in the data, grouping and marking the data, merging the same-group partitions, marking the non-adjustable partitions and the like, so that the phase modulation precision of the distribution station area can be improved, and the probability of phase modulation errors of the distribution station area caused by the influence of unreasonable data is effectively reduced.
S102: calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm;
preferably, the calculating at least one phase modulation scheme according to the three-phase current data of each of the partitions and a preset traversal phase modulation algorithm includes: determining the three-phase current collected by each data collection point as three corresponding loads; traversing the scheme of each load running on any phase, deleting the three schemes of the loads running on the same phase and the scheme of any two loads running on the same phase, and generating at least one phase modulation scheme.
Because the data acquisition point all sets up at the three-phase node, gathers three-phase current, there are 27 kinds of operation modes in the platform district subregion theory that is cut apart by the data acquisition point, the three-phase current that is about to gather is regarded as three load, and every load all can select arbitrary one phase operation, therefore every subregion exists 3^ 27 kind of operation modes. Considering that it is obviously uneconomical to select the same phase for three loads or to select the same phase for two loads, such as AAA, BBC, etc., therefore three phases must be selected for three loads, i.e. to eliminate uneconomical modes of operation, and the remaining 6 modes of operation, at least one of said phasing schemes being arranged as follows:
| ABC | CAB | BCA | CBA | BAC | ACB |
economic distribution mode of three loads
It can be seen that if there are 3 partitions in a certain region, 3 × 6 schemes are included.
S103: and determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalance degree index of each phase modulation scheme and the adjustment of the wiring point proportion.
Preferably, the determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive imbalance degree index of each phase modulation scheme and the adjustment of the ratio of the connection points includes: calculating the unbalance degree of the three-phase current of the power distribution area corresponding to each phase modulation scheme at the acquisition time, and determining the comprehensive unbalance degree of the current of the power distribution area corresponding to each phase modulation scheme; comparing each phase modulation scheme with the original wiring scheme of the power distribution area, and respectively calculating the ratio of the number of wiring points of each phase modulation scheme to be adjusted to all the number of wiring points to serve as the ratio of the adjusted wiring points of the power distribution area corresponding to each phase modulation scheme; respectively calculating the adaptability value of each phase modulation scheme according to the comprehensive current unbalance degree corresponding to each phase modulation scheme and the adjustment wiring point proportion; and sequencing at least one phase modulation scheme according to the fitness value, and determining the optimal phase modulation scheme from at least one phase modulation scheme.
After the scheme is given, the unbalance degree of the three-phase current of the platform area outlet at a certain moment can be obtained through calculation. As the power factor of the household electrical appliance is generally higher, the reactive influence is neglected, and the algebraic sum of each phase current of each acquisition point is the current value of each phase at the outlet of the transformer area. When the current is considered to be larger, the imbalance indicator should have a larger weight in the total imbalance indicator. Therefore, the comprehensive unbalance degree of a certain adjustment scheme in a certain period of time of the distribution room is ∑ (the sum of three-phase currents of all collection points at the outlet of the distribution room in the period of time is ×. the unbalance degree of the three-phase currents)/the sum of the three-phase currents at the outlet of the distribution room in the period of time. Wherein, 0< ═ comprehensive unbalance index < 1.
In practical application, the proportion of the wiring points required to be adjusted in a certain distribution area is directly reflected by the implementation difficulty of the adjustment scheme of the three-phase unbalanced distribution area, so that the proportion of the number of the wiring points required to be adjusted and all the number of the wiring points is calculated in the adjustment scheme compared with the original wiring mode, and the calculation is also one of the problems required to be considered by the algorithm. Wherein, the original connecting line number is the partition number x 3; and adjusting the ratio of the wiring points to 1 when the ratio of the wiring points is 0.
And finally, traversing all the adjustment schemes by taking the comprehensive unbalance degree index of the scheme and the fitness value after the proportion weighting of the adjustment wiring points as the evaluation standard of the goodness and the badness of the adjustment schemes, obtaining the fitness values of all the schemes, arranging all the adjustment schemes from large to small according to the scores, considering the adjustment effect and the implementation difficulty, and selecting the schemes with the top rank, such as the top 10 adjustment schemes, as the optimal adjustment schemes. Wherein, the fitness value is 100-comprehensive unbalance 70% -the wire connection proportion is adjusted 30%.
According to the phase modulation method of the unbalanced transformer area based on the traversal phase modulation algorithm, the power distribution transformer area is divided into a plurality of subareas according to the line topological structure of the power distribution transformer area and the positions of data acquisition points, and three-phase currents of all the subareas are acquired from the data acquisition points; calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm; and determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalance degree index of each phase modulation scheme and the adjustment of the wiring point proportion. Therefore, according to the technical scheme provided by the application, the three-phase current of the data acquisition point is used as a data base, the traversal phase modulation algorithm is used for determining at least one phase modulation scheme, the influence of the comprehensive unbalance index of each phase modulation scheme and the influence of the proportion of the adjusting connection point on the three-phase unbalance are considered, the finally determined optimal phase modulation scheme can quickly and accurately ensure the three-phase balance of the power distribution area, and the method has the advantages of being good in field adaptability, high in calculation speed, low in adjustment cost and high in comprehensive balance.
The traversal phase modulation algorithm adopted by the embodiment of the application can traverse all possible adjustment schemes of the adjustment points, the adaptability value of each scheme is calculated through the multi-index weighting algorithm, and the adjustment scheme with high adaptability is selected.
The embodiment of the invention discloses a phase modulation device of an unbalanced transformer area based on a traversal phase modulation algorithm, please refer to the attached figure 2, which comprises:
the acquisition module 1 is used for dividing a power distribution area into a plurality of subareas according to a line topological structure of the power distribution area and positions of data acquisition points, and acquiring three-phase currents of the subareas from the data acquisition points;
in the embodiment of the application, the transformer area is partitioned according to the topological structure of the transformer area line and the position of the data acquisition point, and the three-phase current data of each partition in a preset time period is acquired according to a preset time interval; for example, when the table is divided into 3 partitions, and one three-phase current data is collected for 5 minutes per partition, 3 (partitions) × 3 (phases) × 288 (data/day) × 2592 data values can be collected one day.
Specifically, the preset time interval and the preset time period may be preset, and if the preset time interval is "30 minutes" and the preset time period is "7 days", the three-phase current data of the power distribution area is acquired every 30 minutes at the beginning, and the acquisition of all the three-phase current data generated by the power distribution area with the preset time period of "7 days" is completed until the acquisition times reach "336". The preset time period may also be one week, two weeks or one month.
In the embodiment of the present application, the unbalanced station area refers to a power distribution station area where a three-phase load imbalance problem has occurred, and the three-phase current data of the unbalanced station area mainly includes current data of three phases, i.e., a-phase current data, a B-phase current data, and a C-phase current data.
In addition, the acquired data can also comprise power data of each partition, phase sequence of each partition, whether each partition is adjustable or not, grouping condition of each partition, and the data is exported by a recorder in a fixed format, and the data can be preprocessed by deleting a time point with load lower than 30% in the data, grouping and marking the data, merging the same-group partitions, marking the non-adjustable partitions and the like, so that the phase modulation precision of the distribution station area can be improved, and the probability of phase modulation errors of the distribution station area caused by the influence of unreasonable data is effectively reduced.
The calculation module 2 is used for calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm;
preferably, the calculation module 2 includes:
the load unit is used for determining the three-phase current collected by each data collection point into three corresponding loads;
and the traversing unit is used for traversing the scheme of each load when the load runs on any phase, deleting the three schemes of the load when the load runs on the same phase and the scheme of any two loads when the load runs on the same phase, and generating at least one phase modulation scheme.
Because the data acquisition point all sets up at the three-phase node, gathers three-phase current, there are 27 kinds of operation modes in the platform district subregion theory that is cut apart by the data acquisition point, the three-phase current that is about to gather is regarded as three load, and every load all can select arbitrary one phase operation, therefore every subregion exists 3^ 27 kind of operation modes. Considering that it is obviously uneconomical to select the same phase for three loads or to select the same phase for two loads, such as AAA, BBC, etc., therefore three phases must be selected for three loads, i.e. to eliminate uneconomical modes of operation, and the remaining 6 modes of operation, at least one of said phasing schemes being arranged as follows:
| ABC | CAB | BCA | CBA | BAC | ACB |
economic distribution mode of three loads
It can be seen that if there are 3 partitions in a certain region, 3 × 6 schemes are included.
And the determining module 3 is used for determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalancedness index of each phase modulation scheme and the adjustment of the proportion of the wiring points.
Preferably, the determining module 3 includes:
the first calculation unit is used for calculating the three-phase current unbalance of the power distribution area corresponding to each phase modulation scheme at the acquisition time and determining the comprehensive current unbalance of the power distribution area corresponding to each phase modulation scheme;
the comparison unit is used for comparing each phase modulation scheme with the original wiring scheme of the power distribution area, and respectively calculating the ratio of the wiring points of each phase modulation scheme to be adjusted to all the wiring points to be used as the ratio of the adjusted wiring points of the power distribution area corresponding to each phase modulation scheme;
the second calculation unit is used for calculating the adaptability value of each phase modulation scheme according to the comprehensive current unbalance degree corresponding to each phase modulation scheme and the adjustment wiring point proportion;
and the determining unit is used for sequencing at least one phase modulation scheme according to the fitness value and determining the optimal phase modulation scheme from at least one phase modulation scheme.
After the scheme is given, the unbalance degree of the three-phase current of the platform area outlet at a certain moment can be obtained through calculation. As the power factor of the household electrical appliance is generally higher, the reactive influence is neglected, and the algebraic sum of each phase current of each acquisition point is the current value of each phase at the outlet of the transformer area. When the current is considered to be larger, the imbalance indicator should have a larger weight in the total imbalance indicator. Therefore, the comprehensive unbalance degree of a certain adjustment scheme in a certain period of time of the distribution room is ∑ (the sum of three-phase currents of all collection points at the outlet of the distribution room in the period of time is ×. the unbalance degree of the three-phase currents)/the sum of the three-phase currents at the outlet of the distribution room in the period of time. Wherein, 0< ═ comprehensive unbalance index < 1.
In practical application, the proportion of the wiring points required to be adjusted in a certain distribution area is directly reflected by the implementation difficulty of the adjustment scheme of the three-phase unbalanced distribution area, so that the proportion of the number of the wiring points required to be adjusted and all the number of the wiring points is calculated in the adjustment scheme compared with the original wiring mode, and the calculation is also one of the problems required to be considered by the algorithm. Wherein, the original connecting line number is the partition number x 3; and adjusting the ratio of the wiring points to 1 when the ratio of the wiring points is 0.
And finally, traversing all the adjustment schemes by taking the comprehensive unbalance degree index of the scheme and the fitness value after the proportion weighting of the adjustment wiring points as the evaluation standard of the goodness and the badness of the adjustment schemes, obtaining the fitness values of all the schemes, arranging all the adjustment schemes from large to small according to the scores, considering the adjustment effect and the implementation difficulty, and selecting the schemes with the top rank, such as the top 10 adjustment schemes, as the optimal adjustment schemes. Wherein, the fitness value is 100-comprehensive unbalance 70% -the wire connection proportion is adjusted 30%.
According to the phase modulation device of the unbalanced transformer area based on the traversal phase modulation algorithm, the power distribution transformer area is divided into a plurality of subareas according to the line topological structure of the power distribution transformer area and the positions of data acquisition points, and the three-phase current of each subarea is acquired from the data acquisition points; calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm; and determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalance degree index of each phase modulation scheme and the adjustment of the wiring point proportion. Therefore, according to the technical scheme provided by the application, the three-phase current of the data acquisition point is used as a data base, the traversal phase modulation algorithm is used for determining at least one phase modulation scheme, the influence of the comprehensive unbalance index of each phase modulation scheme and the influence of the proportion of the adjusting connection point on the three-phase unbalance are considered, the finally determined optimal phase modulation scheme can quickly and accurately ensure the three-phase balance of the power distribution area, and the method has the advantages of being good in field adaptability, high in calculation speed, low in adjustment cost and high in comprehensive balance.
The traversal phase modulation algorithm adopted by the embodiment of the application can traverse all possible adjustment schemes of the adjustment points, the adaptability value of each scheme is calculated through the multi-index weighting algorithm, and the adjustment scheme with high adaptability is selected.
Please refer to a method flowchart corresponding to fig. 1 for the working process of each module provided in the embodiment of the present invention, and detailed description of the working process is omitted.
For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, the functionality of the various modules may be implemented in the same one or more software and/or hardware implementations as the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A phase modulation method of unbalanced station areas based on a traversal phase modulation algorithm is characterized by comprising the following steps:
dividing a power distribution area into a plurality of subareas according to a line topological structure of the power distribution area and the positions of data acquisition points, and acquiring three-phase current of each subarea from the data acquisition points according to a preset time interval;
calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm;
determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalance degree index of each phase modulation scheme and the adjustment of the wiring point proportion;
the calculating at least one phase modulation scheme according to the three-phase current data of each partition and a preset traversal phase modulation algorithm comprises the following steps:
determining the three-phase current collected by each data collection point as three corresponding loads;
traversing a scheme of each load when the load runs on any phase, deleting three schemes of the load when the load runs on the same phase and deleting any two schemes of the load when the load runs on the same phase, and generating at least one phase modulation scheme;
the method for determining the optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalancedness index of each phase modulation scheme and the proportion of the adjusting wiring points comprises the following steps:
calculating the unbalance degree of the three-phase current of the power distribution area corresponding to each phase modulation scheme at the acquisition time, and determining the comprehensive unbalance degree of the current of the power distribution area corresponding to each phase modulation scheme;
comparing each phase modulation scheme with the original wiring scheme of the power distribution area, and respectively calculating the ratio of the number of wiring points of each phase modulation scheme to be adjusted to all the number of wiring points to serve as the ratio of the adjusted wiring points of the power distribution area corresponding to each phase modulation scheme;
respectively calculating the adaptability value of each phase modulation scheme according to the comprehensive current unbalance degree corresponding to each phase modulation scheme and the adjustment wiring point proportion;
and sequencing at least one phase modulation scheme according to the fitness value, and determining the optimal phase modulation scheme from at least one phase modulation scheme.
2. A phase modulation device of unbalanced transformer area based on ergodic phase modulation algorithm is characterized by comprising:
the acquisition module is used for dividing the power distribution area into a plurality of subareas according to the line topological structure of the power distribution area and the position of the data acquisition point, and acquiring the three-phase current of each subarea from the data acquisition point according to a preset time interval;
the calculation module is used for calculating at least one phase modulation scheme according to the three-phase current of each partition and a preset traversal phase modulation algorithm;
the determining module is used for determining an optimal phase modulation scheme from at least one phase modulation scheme according to the comprehensive unbalancedness index of each phase modulation scheme and the proportion of the adjusting wiring points;
the method comprises the following steps:
the load unit is used for determining the three-phase current collected by each data collection point into three corresponding loads;
the traversing unit is used for traversing the scheme of each load when the load runs on any phase, deleting the three schemes of the load when the load runs on the same phase and the scheme of any two loads when the load runs on the same phase, and generating at least one phase modulation scheme;
the determining module includes:
the first calculation unit is used for calculating the three-phase current unbalance of the power distribution area corresponding to each phase modulation scheme at the acquisition time and determining the comprehensive current unbalance of the power distribution area corresponding to each phase modulation scheme;
the comparison unit is used for comparing each phase modulation scheme with the original wiring scheme of the power distribution area, and respectively calculating the ratio of the wiring points of each phase modulation scheme to be adjusted to all the wiring points to be used as the ratio of the adjusted wiring points of the power distribution area corresponding to each phase modulation scheme;
the second calculation unit is used for calculating the adaptability value of each phase modulation scheme according to the comprehensive current unbalance degree corresponding to each phase modulation scheme and the adjustment wiring point proportion;
and the determining unit is used for sequencing at least one phase modulation scheme according to the fitness value and determining the optimal phase modulation scheme from at least one phase modulation scheme.
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