CN111915138B - Method and device for loop closing decision of power distribution network based on measure priority - Google Patents
Method and device for loop closing decision of power distribution network based on measure priority Download PDFInfo
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Abstract
The invention provides a method and a device for loop closing decision making of a power distribution network based on measure priority, and relates to the field of power supply and distribution, wherein the method comprises the following steps: acquiring priority indexes and importance of each priority index; acquiring target measures, and acquiring contribution degree of each priority index of the target measures based on the priority index and the importance degree of each priority index; judging whether each priority index meets the ring closing condition or not, and judging whether the ring is closed or not; if yes, ring closing operation is carried out; if not, taking the target measure based on the contribution degree of each priority index of the target measure. The method provided by the invention can provide a ring closing auxiliary decision with lower risk, avoid accidents and improve the safety of the power utilization system.
Description
Technical Field
The invention relates to the technical field of power distribution loop closing, in particular to a loop closing decision method and device of a power distribution network based on measure priority.
Background
The line overhaul, the accident handling and the daily load switching often need to change the operation mode of the power distribution network, at present, the switching-on and switching-off power supply of each switching station in the power grid system is more common, but because the establishment of a power distribution network model is more complex, the setting calculation is more complicated, and if the checking analysis is not carried out, the loop closing is blindly carried out, and the safety risks of equipment and personnel exist, so that the power failure and the power replacement mode are still adopted at present, the power supply user perceives frequent power failure, and the power supply quality and the power supply reliability are affected. The power supply reliability of the power distribution network is an important ring of the power grid reliability, a comprehensive auxiliary decision algorithm for closing the ring of the power grid is researched, and auxiliary decision for closing the ring operation for transferring the load without power failure of the power distribution network is researched and guided to be developed. By analyzing the loop closing operation of the switch on the distribution network line in advance, a safe and reliable comprehensive auxiliary decision of the loop closing of the power grid is formulated, and the method has important significance for realizing uninterrupted power transfer of the distribution network line load, improving the power supply reliability and avoiding power failure accidents.
With the continuous development of economy and society, users have put higher demands on electricity reliability and safety. Aiming at the current situation of the power grid structure in China, the loop closing operation is the most effective and reliable method for improving the running reliability of the power grid. The main network of the power network in China adopts ring network operation, the power distribution network adopts open loop radiation operation, and when a certain main transformer or a certain line in the power distribution network fails or overhauls, in order to ensure the reliability of power supply, the load of the main transformer needs to be transferred to other feeder lines through safe and reliable loop closing operation, so that the load can be ensured to continue to supply power safely. The safe and reliable ring closing operation is adopted, so that load transfer is not needed, and power is supplied to the load through other paths in the ring network after ring closing. However, if the loop closing points are not properly selected, the voltage difference between the two loop closing points is too large, so that impact current is easily caused, the power supply quality is affected, and the protection misoperation is seriously caused, and even the power equipment is damaged. Particularly, loop closing operation is carried out on feeder lines under two different substations, because the system impedance and bus voltage difference between the different substations are large, accidents which endanger the safety of the power grid, such as overload current, relay protection misoperation, exceeding of short-circuit current, electromagnetic looped network and the like, can be caused by overlarge loop closing current, therefore, the loop closing operation is required to be subjected to pre-risk analysis, the optimal loop closing point is selected, reasonable and effective auxiliary decision making is provided, the magnitudes of loop closing steady-state current and loop closing impact current are calculated in advance, the auxiliary decision for eliminating or minimizing the risks is provided, overload or accidents can be effectively avoided, and the method has important guiding significance for the safe and reliable loop closing operation of the power grid.
Disclosure of Invention
Therefore, the invention aims to provide a loop closing decision method of a power distribution network based on measure priority, so as to provide a loop closing auxiliary decision with lower risk and avoid accidents.
The invention provides a loop closing decision method of a power distribution network based on measure priority, which comprises the following steps:
acquiring priority indexes and importance of each priority index;
acquiring target measures, and acquiring contribution degree of each priority index of the target measures based on the priority index and the importance degree of each priority index;
judging whether each priority index meets the ring closing condition or not, and judging whether the ring is closed or not;
if yes, ring closing operation is carried out;
and if not, taking the target measure based on the contribution degree of each priority index of the target measure.
Preferably, the priority index includes system reliability, system stability, measure operability, and measure economy.
Preferably, the step of acquiring the target measure, based on the priority index and the importance of each priority index, includes
Reliability to the system; and/or; the system stability; and/or; calculating the contribution degree of the measure operability and/or the measure economy;
the step of calculating the contribution of the system reliability comprises the following steps: acquiring the variable quantity of the load active power after the target measure adjusts the power distribution network;
after the target measures are adjusted for one time, taking the maximum value in the variation of the active power of the load as a reference value, and obtaining the ratio of the variation of the active power of the load after each target measure is adjusted to the reference value so as to obtain the contribution value of each measure to the reliability index of the system;
the step of calculating the contribution degree of the system stability comprises the following steps: acquiring the variable quantity of steady-state current effective values of all branches in a loop closing loop after the power distribution network is regulated by a target measure;
obtaining the maximum value in the variation of the steady-state current effective value of each branch in the loop closing loop after the target measures are adjusted once and taking the maximum value as a reference value, and obtaining the ratio of the variation of the steady-state current effective value of each branch in the loop closing loop of the power distribution network by each target measure to the reference value so as to obtain the contribution degree value of each target measure to the system stability index;
the step of calculating the contribution of the measure operability comprises: judging whether power-off operation is needed when the target measure is regulated;
if yes, the target measure can be implemented;
if not, the target measure cannot be implemented;
the step of calculating the contribution degree of the measure economy comprises the following steps: acquiring the active loss of the system after the target measure adjusts the power distribution network;
and obtaining the maximum value of the active loss of the system after the target measure is subjected to one-time adjustment as a reference value, and obtaining the ratio of the active loss of the system to the reference value after the target measure is subjected to one-time adjustment so as to obtain the contribution degree value of the target measure to the measure economy index.
Preferably, the objective measures include regulating transformer taps, switching capacitors, series current limiting reactors, and load redistribution.
Preferably, the step of adjusting the transformer tap includes:
regulating the side with high voltage to increase the transformation ratio and judging whether the ring closing requirement is met;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the transformer transformation ratio reaches the upper limit;
continuously adjusting the transformer based on whether the transformation ratio of the side with high voltage reaches an upper limit result;
if not, executing the side with high regulation voltage to increase the transformation ratio, and judging whether the ring closing requirement is met;
if yes, the side with low voltage is regulated to reduce the transformation ratio, and whether the ring closing requirement is met is judged;
based on the side with low voltage, the transformation ratio is reduced, and whether the judgment result of the ring closing requirement is met is judged, and the transformer is continuously regulated;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the transformation ratio reaches the lower limit;
based on the result of determining whether the ratio reaches the lower limit, the following measures are taken:
if yes, other target measures are taken;
and if not, executing the side with low regulation voltage to reduce the transformation ratio, and judging whether the ring closing requirement is met.
Preferably, the switching capacitor includes:
switching the capacitor bank at the side with high voltage and judging whether the ring closing requirement is met;
if yes, outputting the ring closing auxiliary strategy result,
if not, judging whether the capacitor bank reaches the lower limit;
switching the capacitor bank based on the result of determining whether the capacitor bank reaches the lower limit;
if the voltage reaches the lower limit, switching the capacitor bank at the side with low voltage and judging whether the capacitor bank meets the ring closing requirement;
if the ring closing auxiliary strategy meets the ring requirement, outputting a ring closing auxiliary strategy result;
if the ring closing requirement is not met, judging whether the capacitor bank reaches the upper limit;
if the upper limit is not reached, executing the step of switching the capacitor bank on the side with low voltage and judging whether the capacitor bank meets the ring closing requirement;
if the upper limit is reached, other target measures are taken.
And if the lower limit is not reached, executing the step of switching the capacitor bank on the side with high voltage and judging whether the closed loop requirement is met.
Preferably, the series current limiting reactor includes:
the current limiting reactors are connected in series, and whether the requirement of closing the loop is met is judged;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the upper limit of the series reactor is reached;
if the upper limit is reached, other measures are taken;
and if the upper limit is not reached, executing the series current limiting reactor and judging whether the ring closing requirement is met.
Preferably, the step of load redistribution includes:
switching the load of the high-voltage side and judging whether the load meets the ring closing requirement;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the load redistribution reaches the upper limit or whether the regulation effect meets the requirement;
if the load redistribution does not reach the upper limit or the regulation effect does not meet the requirement, executing the steps of switching the load of the high-voltage side and judging whether the load meets the ring closing requirement;
if the load redistribution reaches the upper limit or the adjusting effect meets the requirement, switching the load of the low-voltage side and judging whether the load meets the ring closing requirement;
if the ring closing requirement is met, outputting a ring closing auxiliary strategy result
If the load does not meet the ring closing requirement, judging whether the load of the switching low-voltage side reaches the lower limit;
if the lower limit is not reached, executing the step of switching the load of the low-voltage side and judging whether the load meets the ring closing requirement or not;
if the lower limit is reached, other target measures are taken.
On the other hand, the invention provides a loop closing decision device of a power distribution network based on measure priority, which comprises the following components:
a first acquisition module: the priority index acquiring module is used for acquiring the importance of each priority index;
and a second acquisition module: the method comprises the steps of acquiring target measures, and acquiring contribution degree of each priority index of the target measures based on the priority index and the importance degree of each priority index;
and a judging module: judging whether each priority index meets the ring closing condition or not, and judging whether the ring is closed or not;
if yes, ring closing operation is carried out;
and if not, taking the target measure based on the contribution degree of each priority index of the target measure.
The embodiment of the invention has the following beneficial effects: the invention provides a method and a device for loop closing decision of a power distribution network based on measure priority, wherein the method comprises the following steps: acquiring priority indexes and importance of each priority index; acquiring target measures, and acquiring contribution degree of each priority index of the target measures based on the priority index and the importance degree of each priority index; judging whether each priority index meets the ring closing condition or not, and judging whether the ring is closed or not; if yes, ring closing operation is carried out; if not, taking the target measure based on the contribution degree of each priority index of the target measure. The method provided by the invention can provide a ring closing auxiliary decision with lower risk, avoid accidents and improve the safety of the power utilization system.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a loop closing decision method of a power distribution network based on measure priority according to an embodiment of the present invention;
FIG. 2 is a flow chart of a regulating transformer tap provided by an embodiment of the invention;
FIG. 3 is a flow chart of a switched capacitor according to an embodiment of the present invention;
fig. 4 is a flowchart of a series current limiting reactor according to an embodiment of the present invention;
fig. 5 is a flow chart of load redistribution according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
At present, because the system impedance and bus voltage difference between different transformer stations are large, accidents which endanger the safety of the power grid, such as overload current, relay protection misoperation, exceeding short-circuit current, electromagnetic looped network and the like, may occur due to overlarge loop closing current, and therefore, the loop closing operation must be subjected to pre-risk analysis.
For the convenience of understanding the present embodiment, first, a method for making a loop-closing decision of a power distribution network based on a measure priority disclosed in the present embodiment will be described in detail.
Embodiment one:
as shown in fig. 1, the present invention provides a method for making a loop closing decision of a power distribution network based on measure priority, which includes:
acquiring priority indexes and importance of each priority index;
acquiring target measures, and acquiring contribution degree of each priority index of the target measures based on the priority index and the importance degree of each priority index;
judging whether each priority index meets the ring closing condition or not, and judging whether the ring is closed or not;
if yes, ring closing operation is carried out;
and if not, taking the target measure based on the contribution degree of each priority index of the target measure.
The priority index includes system reliability, system stability, measure operability, and measure economy.
Further, in an embodiment of the present invention, the step of acquiring the contribution degree of each of the priority indicators of the target measure based on the priority indicators and the importance degree of each of the priority indicators includes
Reliability to the system; and/or; the system stability; and/or; calculating the contribution degree of the measure operability and/or the measure economy;
the step of calculating the contribution of the system reliability comprises the following steps: acquiring the variable quantity of the load active power after the target measure adjusts the power distribution network;
after the target measures are adjusted for one time, taking the maximum value in the variation of the active power of the load as a reference value, and obtaining the ratio of the variation of the active power of the load after each target measure is adjusted to the reference value so as to obtain the contribution value of each measure to the reliability index of the system;
the step of calculating the contribution degree of the system stability comprises the following steps: acquiring the variable quantity of steady-state current effective values of all branches in a loop closing loop after the power distribution network is regulated by a target measure;
obtaining the maximum value in the variation of the steady-state current effective value of each branch in the loop closing loop after the target measures are adjusted once as a reference value, and obtaining the ratio of the variation of the steady-state current effective value of each branch in the loop closing loop of the power distribution network by each target measure to the reference value so as to obtain the contribution degree value of each target measure to the system stability index;
the step of calculating the contribution of the measure operability comprises: judging whether power-off operation is needed when the target measure is regulated;
if yes, the target measure can be implemented;
if not, the target measure cannot be implemented;
further, if the target is practicable, it is denoted as 1, and if it is not practicable, it is denoted as 0;
the step of calculating the contribution degree of the measure economy comprises the following steps: acquiring the active loss of the system after the target measure adjusts the power distribution network;
and obtaining the maximum value of the active loss of the system after the target measure is subjected to one-time adjustment as a reference value, and obtaining the ratio of the active loss of the system to the reference value after the target measure is subjected to one-time adjustment so as to obtain the contribution degree value of the target measure to the measure economy index.
If n indexes exist, the n indexes take the value of K= [ K ] 1 ,k 2 ,…,k n ] T ＝[n,n-1,…,1] T
Further, the calculation of the priority values of m selected measures can be performed according to the following formula
In the above, T i -an ith target measure priority calculation;
and calculating the priority value of each target measure according to the formula, wherein the larger the value is, the more the measure has greater influence on m indexes of the system, and the less favorable is for the measure to be regulated preferentially, so that the order from small to large according to the priority value is the order from high to low of the adopted auxiliary measure priority.
Embodiment two:
in a second embodiment, the target measure includes adjusting a transformer tap, switching a capacitor, connecting a current limiting reactor in series, and load redistribution.
Preferably, as shown in fig. 2, the step of adjusting the transformer tap includes:
regulating the side with high voltage to increase the transformation ratio and judging whether the ring closing requirement is met;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the transformer transformation ratio reaches the upper limit;
continuously adjusting the transformer based on whether the transformation ratio of the side with high voltage reaches an upper limit result;
if not, executing the side with high regulation voltage to increase the transformation ratio, and judging whether the ring closing requirement is met;
if yes, the side with low voltage is regulated to reduce the transformation ratio, and whether the ring closing requirement is met is judged;
based on the side with low voltage, the transformation ratio is reduced, and whether the judgment result of the ring closing requirement is met is judged, and the transformer is continuously regulated;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the transformation ratio reaches the lower limit;
based on the result of determining whether the ratio reaches the lower limit, the following measures are taken:
if yes, other target measures are taken;
further, based on the measure priority, taking the next target measure;
and if not, executing the side with low regulation voltage to reduce the transformation ratio, and judging whether the ring closing requirement is met.
Further, as shown in fig. 3, the switched capacitor includes:
switching the capacitor bank at the side with high voltage and judging whether the ring closing requirement is met;
further, there is a need to reduce the number of capacitor banks
If yes, outputting the ring closing auxiliary strategy result,
if not, judging whether the capacitor bank reaches the lower limit;
switching the capacitor bank based on the result of determining whether the capacitor bank reaches the lower limit;
if the voltage reaches the lower limit, switching the capacitor bank at the side with low voltage and judging whether the capacitor bank meets the ring closing requirement;
further, the number of capacitor banks is increased;
if the ring closing requirement is met, outputting a ring closing auxiliary strategy result;
if the capacitor bank does not meet the ring closing requirement, judging whether the capacitor bank reaches the upper limit;
if the upper limit is not reached, executing the step of switching the capacitor bank on the side with low voltage and judging whether the capacitor bank meets the ring closing requirement;
if the upper limit is reached, other target measures are taken.
Further, based on the target measures, taking the next target measure;
and if the lower limit is not reached, executing the step of switching the capacitor bank on the side with high voltage and judging whether the closed loop requirement is met.
Preferably, as shown in fig. 4, the series current limiting reactor includes:
the current limiting reactors are connected in series, and whether the requirement of closing the loop is met is judged;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the upper limit of the series reactor is reached;
if the upper limit is reached, other target measures are taken;
in the embodiment provided by the invention, the next target measure is adopted
And if the upper limit is not reached, executing the series current limiting reactor and judging whether the ring closing requirement is met.
Preferably, as shown in fig. 5, the step of load redistribution includes:
switching the load of the high-voltage side and judging whether the load meets the ring closing requirement;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the load redistribution reaches the upper limit or whether the regulation effect meets the requirement;
if the load redistribution does not reach the upper limit or the regulation effect does not meet the requirement, executing the steps of switching the load of the high-voltage side and judging whether the load meets the ring closing requirement;
if the load redistribution reaches the upper limit or the adjusting effect meets the requirement, switching the load of the low-voltage side and judging whether the load meets the ring closing requirement;
if the ring closing requirement is met, outputting a ring closing auxiliary strategy result
If the load does not meet the ring closing requirement, judging whether the load of the switching low-voltage side reaches the lower limit;
if the lower limit is not reached, executing the step of switching the load of the low-voltage side and judging whether the load meets the ring closing requirement or not;
if the lower limit is reached, other target measures are taken.
Further, based on the priority of the target measure, taking the next-level priority measure;
embodiment III:
the invention provides a third embodiment of a loop closing decision device of a power distribution network based on measure priority, which comprises:
a first acquisition module: the priority index acquiring module is used for acquiring the importance of each priority index;
and a second acquisition module: the method comprises the steps of acquiring target measures, and acquiring contribution degree of each priority index of the target measures based on the priority index and the importance degree of each priority index;
and a judging module: judging whether each priority index meets the ring closing condition or not, and judging whether the ring is closed or not;
if yes, ring closing operation is carried out;
and if not, taking the target measure based on the contribution degree of each priority index of the target measure.
The invention has the following technical effects:
the invention provides a measure priority-based auxiliary decision-making method for guiding power grid overhaul to carry out loop closing operation of transferring load without power failure, which has the following two innovation points:
1) According to the invention, by analyzing the auxiliary decision method of the loop closing operation in advance, auxiliary measures for eliminating the loop closing risk are formulated in advance, the loop closing operation of transferring the load without power failure of the power grid is ensured to be carried out smoothly, the loop closing success rate is improved, and the power failure loss of the power grid is reduced.
2) The invention provides an auxiliary decision-making method for loop closing operation based on measure priority, which can quickly obtain comprehensive auxiliary decision-making meeting the loop closing condition according to the operation characteristics and specific conditions of a power grid.
The relative steps, numerical expressions and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The device provided by the embodiment of the present invention has the same implementation principle and technical effects as those of the foregoing method embodiment, and for the sake of brevity, reference may be made to the corresponding content in the foregoing method embodiment where the device embodiment is not mentioned.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The loop closing decision-making method of the power distribution network based on the measure priority is characterized by comprising the following steps of:
acquiring priority indexes and importance of each priority index, wherein the priority indexes comprise system reliability, system stability, measure operability and measure economy;
acquiring target measures, and acquiring contribution degree of each priority index of the target measures based on the priority index; comprising the following steps: reliability to the system; and/or; the system stability; and/or; calculating the contribution degree of the measure operability and/or the measure economy;
judging whether each priority index meets the ring closing condition or not, and judging whether the ring is closed or not;
if yes, ring closing operation is carried out;
if not, taking the target measure based on the contribution degree of each priority index of the target measure;
if n indexes exist, the n indexes take the value of K= [ K ] 1 ,k 2 ,…,k n ] T ＝[n,n-1,…,1] T The calculation of the priority values of m selected measures can be performed according to the following formula,
in the above, T i -an ith target measure priority calculation;
calculating the priority value of each target measure according to the formula, wherein the larger the value is, the larger the influence of the measure on m indexes of the system is, the more unfavorable the measure is to be adjusted preferentially, so that the order from the small to the large according to the priority value is the order from the high to the low of the priority of the adopted auxiliary measure;
the step of calculating the contribution degree of the system reliability comprises the following steps: acquiring the variable quantity of the load active power after the target measure adjusts the power distribution network;
after the target measures are adjusted for one time, taking the maximum value in the variation of the active power of the load as a reference value, and obtaining the ratio of the variation of the active power of the load after each target measure is adjusted to the reference value so as to obtain the contribution value of each measure to the reliability index of the system;
the step of calculating the contribution degree of the system stability comprises the following steps: acquiring the variable quantity of steady-state current effective values of all branches in a loop closing loop after the power distribution network is regulated by a target measure;
obtaining the maximum value in the variation of the steady-state current effective value of each branch in the loop closing loop after the target measures are adjusted once and taking the maximum value as a reference value, and obtaining the ratio of the variation of the steady-state current effective value of each branch in the loop closing loop of the power distribution network by each target measure to the reference value so as to obtain the contribution degree value of each target measure to the system stability index;
the step of calculating the contribution of the measure operability comprises: judging whether power-off operation is needed when the target measure is regulated;
if yes, the target measure is not implemented;
if not, the target measure can be implemented;
the step of calculating the contribution degree of the measure economy comprises the following steps: acquiring the active loss of the system after the target measure adjusts the power distribution network;
and obtaining the maximum value of the active loss of the system after the target measure is subjected to one-time adjustment as a reference value, and obtaining the ratio of the active loss of the system to the reference value after the target measure is subjected to one-time adjustment so as to obtain the contribution degree value of the target measure to the measure economy index.
2. The method of claim 1, wherein the target measures include regulating transformer taps, switching capacitors, series current limiting reactors, and load redistribution.
3. The method of claim 2, wherein the step of adjusting the transformer tap comprises:
regulating the side with high voltage to increase the transformation ratio and judging whether the ring closing requirement is met;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the transformer transformation ratio reaches the upper limit;
continuously adjusting the transformer based on whether the transformation ratio of the side with high voltage reaches an upper limit result;
if not, executing the side with high regulation voltage to increase the transformation ratio, and judging whether the ring closing requirement is met;
if yes, the side with low voltage is regulated to reduce the transformation ratio, and whether the ring closing requirement is met is judged;
based on the side with low voltage, the transformation ratio is reduced, and whether the judgment result of the ring closing requirement is met is judged, and the transformer is continuously regulated;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the transformation ratio reaches the lower limit;
based on the result of determining whether the ratio reaches the lower limit, the following measures are taken:
if yes, other target measures are taken;
and if not, executing the side with low regulation voltage to reduce the transformation ratio, and judging whether the ring closing requirement is met.
4. The method of claim 2, wherein the switched capacitor comprises:
switching the capacitor bank at the side with high voltage and judging whether the ring closing requirement is met;
if yes, outputting the ring closing auxiliary strategy result,
if not, judging whether the capacitor bank reaches the lower limit;
switching the capacitor bank based on the result of determining whether the capacitor bank reaches the lower limit;
if the voltage reaches the lower limit, switching the capacitor bank at the side with low voltage and judging that the capacitor bank meets the ring closing requirement;
if the ring closing requirement is met, outputting a ring closing auxiliary strategy result;
if the capacitor bank does not meet the ring closing requirement, judging whether the capacitor bank reaches the upper limit;
if the upper limit is not reached, executing the step of switching the capacitor bank on the side with low voltage and judging whether the capacitor bank meets the ring closing requirement;
if the upper limit is reached, other target measures are adopted;
and if the lower limit is not reached, executing the step of switching the capacitor bank on the side with high voltage and judging whether the closed loop requirement is met.
5. The method of claim 2, wherein the series current limiting reactor comprises:
the current limiting reactors are connected in series, and whether the requirement of closing the loop is met is judged;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the upper limit of the series reactor is reached;
if the upper limit is reached, other target measures are taken;
and if the upper limit is not reached, executing the series current limiting reactor and judging whether the ring closing requirement is met.
6. The method of claim 2, wherein the step of load reassigning comprises:
switching the load of the high-voltage side and judging whether the load meets the ring closing requirement;
if yes, outputting a loop closing auxiliary strategy result;
if not, judging whether the load redistribution reaches the upper limit or whether the regulation effect meets the requirement;
if the load redistribution does not reach the upper limit or the regulation effect does not meet the requirement, executing the steps of switching the load of the high-voltage side and judging whether the load meets the ring closing requirement;
if the load redistribution reaches the upper limit or the adjusting effect meets the requirement, switching the load of the low-voltage side and judging whether the load meets the ring closing requirement;
if the ring closing requirement is met, outputting a ring closing auxiliary strategy result;
if the load does not meet the ring closing requirement, judging whether the load of the switching low-voltage side reaches the lower limit;
if the lower limit is not reached, executing the step of switching the load of the low-voltage side and judging whether the load meets the ring closing requirement or not;
if the lower limit is reached, other target measures are taken.
7. The utility model provides a closing ring decision-making device of distribution network based on measure priority, which is characterized in that includes:
a first acquisition module: the method comprises the steps of acquiring priority indexes and importance of each priority index, wherein the priority indexes comprise system reliability, system stability, measure operability and measure economy;
and a second acquisition module: the method for acquiring the target measure, acquiring the contribution degree of each priority index of the target measure based on the priority index comprises the following steps: reliability to the system; and/or; the system stability; and/or; calculating the contribution degree of the measure operability and/or the measure economy;
the step of calculating the contribution degree of the system reliability comprises the following steps: acquiring the variable quantity of the load active power after the target measure adjusts the power distribution network;
after the target measures are adjusted for one time, taking the maximum value in the variation of the active power of the load as a reference value, and obtaining the ratio of the variation of the active power of the load after each target measure is adjusted to the reference value so as to obtain the contribution value of each measure to the reliability index of the system;
the step of calculating the contribution degree of the system stability comprises the following steps: acquiring the variable quantity of steady-state current effective values of all branches in a loop closing loop after the power distribution network is regulated by a target measure;
obtaining the maximum value in the variation of the steady-state current effective value of each branch in the loop closing loop after the target measures are adjusted once and taking the maximum value as a reference value, and obtaining the ratio of the variation of the steady-state current effective value of each branch in the loop closing loop of the power distribution network by each target measure to the reference value so as to obtain the contribution degree value of each target measure to the system stability index;
the step of calculating the contribution of the measure operability comprises: judging whether power-off operation is needed when the target measure is regulated;
if yes, the target measure is not implemented;
if not, the target measure can be implemented;
the step of calculating the contribution degree of the measure economy comprises the following steps: acquiring the active loss of the system after the target measure adjusts the power distribution network;
the method comprises the steps of obtaining the maximum value of the active loss of a system after one-time adjustment of a target measure as a reference value, and obtaining the ratio of the active loss of the system to the reference value after one-time adjustment of the target measure so as to obtain the contribution degree value of the target measure to the measure economy index;
and a judging module: judging whether each priority index meets the ring closing condition or not, and judging whether the ring is closed or not;
if yes, ring closing operation is carried out;
if not, taking the target measure based on the contribution degree of each priority index of the target measure;
if n indexes exist, the n indexes take the value of K= [ K ] 1 ,k 2 ,…,k n ] T ＝[n,n-1,…,1] T The calculated value of the contribution degree of each target measure to each index is obtained, and the calculation of m selected measure priority values can be carried out according to the following formula
In the above, T i -an ith target measure priority calculation;
and calculating the priority value of each target measure according to the formula, wherein the larger the value is, the more the measure has greater influence on m indexes of the system, and the less favorable is for the measure to be regulated preferentially, so that the order from small to large according to the priority value is the order from high to low of the adopted auxiliary measure priority.
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