CN110176759B - Isolated network autonomous operation capability assessment method and device - Google Patents
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Abstract
The invention provides a method and a device for evaluating the autonomous operation capacity of an isolated network, wherein the method comprises the steps of obtaining parameters of the isolated network, calculating the influence of power receiving proportion, heavy load rate, power supply complementary rate, standby coefficient, cooperativity, grid-related parameter switching on the power generation capacity of the power grid, controllable load proportion and network source complementary according to the parameters of the isolated network, forming a correlation matrix according to the parameters, calculating the correlation coefficient and index weight, calculating evaluation scores according to the correlation coefficient and the index weight, and determining an evaluation result according to the evaluation scores and a preset evaluation range. According to the method, the isolated power grid is effectively evaluated, a foundation is provided for isolated power grid design and fault solution, and the problem that the existing isolated power grid lacks an effective evaluation means and scientific basis is lacked in isolated power grid design and fault solution is solved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a device for evaluating the autonomous operation capacity of an isolated network.
Background
As power systems have evolved, power plants have become larger and larger in size. Due to the restriction of factors such as geography, economy and the like, the construction of a power plant is generally far away from a city, and the city is used as a place with high load density and mainly depends on an external power grid to input electric energy so as to realize power utilization balance. In addition, with the development of national energy strategy and power grid planning and the promotion of optimized resource allocation such as west-qi-east transmission, west-electricity-east transmission and the like, the phenomenon of a high-power-receiving-ratio urban receiving-end power grid is prominent. Frequent large power failure accidents at home and abroad show that the large-scale receiving end power grid fault is difficult to stop, and once large-scale power failure, electric power supply paralysis and other accidents occur, huge economic loss is caused, and serious social consequences are caused. When the receiving-end power grid loses external power input to form an isolated grid, whether self-stability and autonomous operation can be maintained becomes more critical.
At present, the study on isolated grid operation capacity is mostly based on a local technology, and the source-load interaction and the overall understanding of a power grid are lacked. Meanwhile, the evaluation of the isolated network autonomous operation capability of the large-scale receiving-end power grid is very lack, and the evaluation of the isolated network autonomous operation capability has important significance in various aspects such as planning, operation, fault treatment and the like of the power system.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a device for evaluating the autonomous operation capacity of an isolated network.
The invention provides a method for evaluating the autonomous operation capacity of an isolated network, which comprises the following steps:
acquiring parameters of an isolated power grid, wherein the parameters of the isolated power grid comprise power received and input on a single external contact line in the isolated power grid, the number of the external contact lines, total load of the power grid in the isolated power grid, the number of equipment and lines in a heavy-load state, the total number of the equipment and the lines, the generated energy of each generator set and the attributive type of each generator set, controllable attributes of each generator set, the generated energy sum of the generator sets when the grid-related parameters are switched according to specific settings, the generated energy sum of the generator sets when the effect is optimal in the switching of the grid-related parameters, the generated energy sum of the generator sets when the effect is worst in the switching of the grid-related parameters, the standby capacity and the rated power of each generator set, the power of each level of load, the participation factor of each level of load, the level of load;
calculating the power receiving proportion according to the power received and input by a single external connecting line in the isolated network, the number of the external connecting lines and the total load of the power grid in the isolated network;
calculating the reloading rate according to the number of the equipment and the lines in the reloading state and the total number of the equipment and the lines;
calculating the power supply complementation rate according to the generated energy of each generator set and the attributive type of each generator set;
calculating a standby coefficient of the generator set according to the standby capacity and the rated power of each generator set;
calculating the cooperativity according to the generated energy of each generator set and the controllable attribute of each generator set;
calculating the influence of the grid-related parameter switching on the power generation amount of the power grid according to the power generation amount sum of the power generation units when the grid-related parameters are switched according to the specific setting, the power generation amount sum of the power generation units when the effect is optimal in the grid-related parameter switching, and the power generation amount sum of the power generation units when the effect is worst in the grid-related parameter switching;
calculating a controllable load proportion according to the power of each level of load, the participation factor of each level of load, the total load of the power grid in the isolated network and the level of the load;
calculating the network source load complementarity according to the load rate of any equipment and line;
constructing an incidence matrix according to the influence of the power receiving proportion, the heavy load rate, the power supply complementation rate, the generator set standby coefficient, grid-related parameter switching on the power generation amount of a power grid, the cooperativity, the controllable load proportion and the grid source load complementarity;
calculating a correlation coefficient and an index weight according to the correlation matrix;
and calculating an evaluation score according to the correlation coefficient and the index weight, and determining an evaluation result according to the evaluation score and a preset evaluation range.
Further, calculating the power receiving proportion according to the power received and input by a single external tie line in the isolated network, the number of the external tie lines and the total load of the power grid in the isolated network specifically comprises:
the formula for calculating the power receiving ratio is specifically
Said X1In an electric power receiving ratio of PlurReceiving input power on a single external tie line in the isolated network, wherein k is the number of the external tie lines and P∑loadRepresenting the total load on the grid.
Further, calculating the power supply complementation rate according to the generated energy of each generator set and the attributive type of each generator set specifically comprises:
calculating the total power generation of each type of generator set according to the power generation of each generator set and the attributive type of each generator set;
calculating the average value of the generated energy of the generator set with the maximum total generated energy, wherein the calculation formula is specifically
The P ismavgThe average value of the generated energy of the generator sets of the type with the maximum total generated energy is PmiThe power generation amount of each generator set belonging to the class of generator sets with the maximum total power generation amount is represented by p, and the number of the generator sets belonging to the class of generator sets with the maximum total power generation amount is represented by p;
calculating the standard deviation of the generated energy of the one type of generating set with the maximum total generated energy according to the generated energy average value of the one type of generating set with the maximum total generated energy and the generated energy of each generating set belonging to the one type of generating set with the maximum total generated energy, wherein the calculation formula is specifically
The sigmaAThe standard deviation of the generated energy of the generator set of the type with the maximum total generated energy is obtained;
calculating the average value of the generated energy of all the generator sets, wherein the calculation formula is specifically
The P isavgThe P is the average value of the generated energy of all the generator setsiThe power generation amount of a single generator set is q, and the q is the total number of the generator sets;
calculating according to the generated energy of the single generator set and the average value of the generated energy of all the generator sets
The calculation formula of the standard deviation of the generated energy of all the generator sets is specifically
The sigmaBGenerating capacity standard deviation of all the generator sets;
calculating the power supply complementation rate according to the generated energy standard deviation of the one type of generating set with the maximum total generated energy and the generated energy standard deviations of all the generating sets, wherein the formula for calculating the power supply complementation rate is specifically
Said X3Is the power supply complementation rate.
Further, calculating the influence of the grid-related parameter switching on the power generation amount of the power grid according to the power generation amount sum of the power generation units when the grid-related parameters are switched according to the specific setting, the power generation amount sum of the power generation units with the optimal effect in the grid-related parameter switching, and the power generation amount sum of the power generation units with the worst effect in the grid-related parameter switching specifically comprises:
the formula for calculating the influence of grid-related parameter switching on the power generation capacity of the power grid is specifically
Said X6The sigma P is used for influencing the power generation capacity of the power grid by switching grid related parametersiThe sum of the generated energy of the generator set when the grid-related parameters are switched according to a specific setting, the sigma PoThe summation of the generated energy of the generator set with the optimal effect in the network-related parameter switching is sigma PwThe power generation amount of the generator set with the worst effect in the network-related parameter switching is the sum.
Further, the step of calculating the controllable load proportion according to the power of each stage of load, the participation factor of each stage of load, the total load of the power grid in the isolated grid and the stage number of the load specifically comprises the following steps:
calculating the controllable load of the power grid in the isolated network according to the power of each level of load, the participation factor of each level of load and the level of load, and calculating the controllable load of the power grid in the isolated network
The P islcFor the controllable load of the power grid in the isolated grid, kvFor each level of load participation factor, PlvFor the power of each level of load, h is the stage number of the current load, and v is the stage number of the load from 1 to h;
calculating the controllable load proportion according to the controllable load of the power grid in the isolated network and the total load of the power grid in the isolated network
Said X7For a controllable load proportion, PΣloadThe total load of the power grid in the isolated grid.
Further, calculating the network source load complementarity according to the load rate of any device and line specifically comprises:
calculating the average value of the load rates of all the equipment and the lines according to the load rate of any equipment and line, wherein the calculation formula is specifically
Eta ofavgIs the average value of the load rates of all the equipment and lines, z is the total number of all the equipment and lines, and eta iswIs the load factor of any equipment and line;
calculating the standard deviation of the load rate according to the load rate of any equipment and line and the average value of the load rates of all the equipment and lines, wherein the calculation formula is specifically
The sigmaτIs the standard deviation of the load rate;
calculating the network source load according to the average value of the load rates of all the equipment and the lines and the standard deviation of the load ratesComplementarity, the calculation formula is
Said X8The net source charge complementarity.
Further, sequentially constructing a correlation matrix according to the power receiving proportion, the heavy load rate, the power supply complementation rate, the generator set standby coefficient, the influence of grid-related parameter switching on the power generation amount of the power grid, the cooperativity, the controllable load proportion and the grid source load complementarity specifically comprises:
constructing an incidence matrix
I represents the number of data groups, i is more than or equal to 1 and less than or equal to m, and m represents the number of data groups more than i; j represents the element quantity of each group of data elements, j is more than or equal to 1 and less than or equal to n, and n is 8.
Further, calculating the correlation coefficient and the index weight according to the correlation matrix specifically includes:
presetting a reference sequence X0＝(X00,X01,...,X0j,...,X0n)；
Calculating the absolute value of the difference value of each element of the incidence matrix and the element corresponding to each element in the preset reference number sequence, wherein the calculation formula is [ delta ]k]＝(zk-z0) N, where k is the number of data sets, zkFor the kth group of data elements of the correlation matrix, z0For data elements of a predetermined reference sequence, said [ Delta ]k]Obtaining an absolute value of a difference value of each element of the incidence matrix and an element corresponding to each element in the preset reference number sequence;
the correlation coefficient is calculated by the formula
Xi isijAs a correlation coefficient, said Δi,jThe difference value of the correlation matrix and the preset reference number sequence is obtained, and rho is a resolution coefficient;
order to
Push out
ρ (n) }, ρ (k) values include:
when in use
When the value is equal to 1.5 epsilon (k);
when in use
When the value is equal to 2 epsilon (k), taking rho (k);
when in use
When the value is greater than the predetermined value, taking rho (k) as 0.9;
when epsilon (k) is 0, taking a value randomly;
according to the said Δi,jCalculating the correlation coefficient xiij；
Entropy value defining the ith evaluation index
The Hi is the entropy of the ith evaluation index, and the fijIs the proportion of the ith proposal in the jth index;
calculating fijIs specifically shown as
Said XijIs the jth element of the ith group of data;
when f isijWhen equal to 0, fij ln fij＝0；
The entropy weight of the ith evaluation index is defined as
And satisfy the conditions
Calculating to obtain index weight W ═ omega1,ω2,...,ωn}。
Further, calculating an evaluation score according to the correlation coefficient and the index weight specifically includes:
the formula for calculating the evaluation score is specifically
Φi∈[0，1]2,3, said i ═ m; j 1,2, n, ωjIs the weight, ξ, of the jth indexi(j) Is a correlation coefficient.
The invention provides a device for evaluating the autonomous operation capability of an isolated network, which comprises:
an acquisition unit for acquiring parameters of the isolated grid power grid, the parameters of the isolated power grid comprise power received and input on a single external tie line in the isolated power grid, the number of the external tie lines, total load of the power grid in the isolated power grid, the number of equipment and lines in a heavy load state, the total number of the equipment and the lines, the generated energy of each generator set and the attributive type of each generator set, the controllable attribute of each generator set, the generated energy sum of the generator sets when the grid-related parameters are switched according to specific settings, the generated energy sum of the generator sets when the effect is optimal in the grid-related parameter switching, the generated energy sum of the generator sets when the effect is the worst in the grid-related parameter switching, the standby capacity and rated power of each generator set, the power of each level of load, participation factors of each level of load, the level of load and the load rate of any equipment;
the first calculation unit is used for calculating the power receiving proportion according to the power received and input by a single external connecting line in the isolated network, the number of the external connecting lines and the total load of the power grid in the isolated network;
the second calculating unit is used for calculating the reloading rate according to the number of the equipment and the lines in the reloading state and the total number of the equipment and the lines;
the third calculating unit is used for calculating the power supply complementation rate according to the generated energy of each generator set and the attributive type of each generator set;
the fourth calculation unit is used for calculating the standby coefficient of each generator set according to the standby capacity and the rated power of each generator set;
the fifth calculation unit is used for calculating the cooperativity according to the power generation amount of each generator set and the controllable attribute of each generator set;
the sixth calculating unit is used for calculating the influence of the grid-related parameter switching on the power generation of the power grid according to the power generation sum of the power generation units when the grid-related parameters are switched according to the specific setting, the power generation sum of the power generation units when the effect is optimal in the grid-related parameter switching, and the power generation sum of the power generation units when the effect is worst in the grid-related parameter switching;
the seventh calculating unit is used for calculating the controllable load proportion according to the power of each level of load, the participation factor of each level of load, the total load of the power grid in the isolated network and the level of the load;
the eighth calculating unit is used for calculating the network source load complementarity according to the load rate of any equipment and line;
the construction unit is used for constructing a correlation matrix according to the influence of the power receiving proportion, the heavy load rate, the power supply complementation rate, the generator set standby coefficient and the grid-related parameter switching on the power generation amount of a power grid, the cooperativity, the controllable load proportion and the grid source load complementarity;
a ninth calculating unit, configured to calculate a correlation coefficient and an index weight according to the correlation matrix;
and the evaluation unit is used for calculating an evaluation score according to the correlation coefficient and the index weight and determining an evaluation result according to the evaluation score and a preset evaluation range.
The implementation of the invention has the following beneficial effects:
according to the method and the device, the parameters of the isolated power grid are obtained, the power receiving proportion, the heavy load rate, the power supply complementary rate, the standby coefficient, the cooperativity, the influence of the switching of the grid-related parameters on the power generation capacity of the power grid, the controllable load proportion and the grid source complementary performance are calculated according to the parameters of the isolated power grid, the incidence matrix is formed according to the parameters, the incidence coefficient and the index weight are calculated, the evaluation score is calculated according to the incidence coefficient and the index weight, the evaluation result is determined according to the evaluation score and the preset evaluation range, and the problem that the scientific basis is lacked in the design and fault solution of the isolated power grid due to the lack of an effective evaluation means in the existing isolated.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of an isolated grid autonomous operation capability evaluation method according to an embodiment of the present invention.
Fig. 2 is a structural diagram of an isolated network autonomous operation capability evaluation apparatus according to an embodiment of the present invention.
Fig. 3 is a diagram of an isolated grid structure according to an embodiment of the present invention.
Detailed Description
The core content of the patent is to obtain isolated grid data, calculate an evaluation score of the isolated grid autonomous capacity, and evaluate the isolated grid autonomous capacity according to the evaluation score, and specific embodiments of the method and the device are further described with reference to the accompanying drawings and embodiments.
The following describes embodiments of the isolated network autonomous operation capability assessment method and apparatus provided by the present invention in detail.
As shown in fig. 1, the present invention provides a method for evaluating an isolated grid autonomous operation capability, where the method includes:
step S101, obtaining parameters of an isolated power grid, wherein the parameters of the isolated power grid comprise power received and input by a single external contact line in the isolated power grid, the number of the external contact lines, total load of the power grid in the isolated power grid, the number of equipment and lines in a heavy load state, the total number of the equipment and the lines, generated energy of each generator set, attributive type of each generator set and controllable attributes of each generator set, the method comprises the steps that the power generation amount sum of a generator set when grid-related parameters are switched according to specific settings, the power generation amount sum of the generator set when the effect is optimal in the switching of the grid-related parameters, the power generation amount sum of the generator set when the effect is worst in the switching of the grid-related parameters, the spare capacity and rated power of each generator set, the power of each level of load, the participation factor of each level of load, the level of the load and the load rate of any equipment and line.
It should be noted that the power received by a single external interconnection line in the isolated grid, the total load of the power grid in the isolated grid, and the number of devices and lines in a heavy load state are acquired by detection and then stored in the database, and the rest of data are prestored in the database and can be acquired by query.
Step S102, calculating the power receiving proportion according to the power received and input by a single external connecting line in the isolated network, the number of the external connecting lines and the total load of the power grid in the isolated network.
The power receiving ratio is the power of the isolated network receiving external input, and the formula for calculating the power receiving ratio is specifically
Said X1In an electric power receiving ratio of PlurReceiving input power on a single external tie line in the isolated network, wherein k is the number of the external tie lines and P∑loadRepresenting the total load on the grid.
And step S103, calculating the reloading rate according to the number of the equipment and the lines in the reloading state and the total number of the equipment and the lines.
It should be noted that, if the load of a general device or line is greater than 80%, the device or line is evaluated to be in a heavy load state, and the calculation formula is specifically
Said X2For heavy duty ratio, jhlIndicating the number of devices (or lines) in a heavy-duty state, jallRepresenting the total number of devices (or lines).
And step S104, calculating the power supply complementation rate according to the generated energy of each generator set and the attributive type of each generator set.
It should be noted that the calculating step specifically includes:
calculating the total power generation of each type of generator set according to the power generation of each generator set and the attributive type of each generator set;
calculating the average value of the generated energy of the generator set with the maximum total generated energy, wherein the calculation formula is specifically
The P ismavgThe average value of the generated energy of the generator sets of the type with the maximum total generated energy is PmiThe power generation amount of each generator set belonging to the class of generator sets with the maximum total power generation amount is represented by p, and the number of the generator sets belonging to the class of generator sets with the maximum total power generation amount is represented by p;
calculating the standard deviation of the generated energy of the one type of generating set with the maximum total generated energy according to the generated energy average value of the one type of generating set with the maximum total generated energy and the generated energy of each generating set belonging to the one type of generating set with the maximum total generated energy, wherein the calculation formula is specifically
The sigmaAThe standard deviation of the generated energy of the generator set of the type with the maximum total generated energy is obtained;
calculating the average value of the generated energy of all the generator sets, wherein the calculation formula is specifically
The P isavgThe P is the average value of the generated energy of all the generator setsiThe power generation amount of a single generator set is q, and the q is the total number of the generator sets;
calculating according to the generated energy of the single generator set and the average value of the generated energy of all the generator sets
All electric power generationThe standard deviation of the generating capacity of the unit is calculated by the following formula
The sigmaBGenerating capacity standard deviation of all the generator sets;
calculating the power supply complementation rate according to the generated energy standard deviation of the one type of generating set with the maximum total generated energy and the generated energy standard deviations of all the generating sets, wherein the formula for calculating the power supply complementation rate is specifically
Said X3Is the power supply complementation rate.
And step S105, calculating a generator set standby coefficient according to the standby capacity and the rated power of each generator set.
It should be noted that the formula for calculating the standby coefficient of the generator set is specifically
X4Representing unit stand-by coefficient, PBiRepresenting reserve capacity of individual units, PNiRepresenting the power rating of the individual genset.
And S106, calculating the cooperativity according to the power generation amount of each generator set and the controllable attribute of each generator set.
It should be noted that the calculation synergy formula is
Said X5Representing the proportion of the generated energy of the uncontrollable power supply to all the generated energy, PunlRepresenting the power generation of a single uncontrollable power generator set.
And S107, calculating the influence of the grid-related parameter switching on the power generation amount of the power grid according to the sum of the power generation amounts of the power generator sets when the grid-related parameters are switched according to the specific setting, the sum of the power generation amounts of the power generator sets when the effect is optimal in the grid-related parameter switching, and the sum of the power generation amounts of the power generator sets when the effect is worst in the grid-related parameter switching.
It should be noted that the computation involves a netThe formula of the influence of parameter switching on the power generation capacity of the power grid is specifically
Said X6The sigma P is used for influencing the power generation capacity of the power grid by switching grid related parametersiThe sum of the generated energy of the generator set when the grid-related parameters are switched according to a specific setting, the sigma PoThe summation of the generated energy of the generator set with the optimal effect in the network-related parameter switching is sigma PwThe power generation amount of the generator set with the worst effect in the network-related parameter switching is the sum.
And S108, calculating a controllable load proportion according to the power of each level of load, the participation factor of each level of load, the total load of the power grid in the isolated network and the level of the load.
It should be noted that the controllable load of the power grid in the isolated grid is calculated according to the power of each level of load, the participation factor of each level of load and the level number of the load, and the controllable load of the power grid in the isolated grid is calculated
The P islcFor the controllable load of the power grid in the isolated grid, kvFor each level of load participation factor, PlvFor the power of each level of load, h is the stage number of the current load, and v is the stage number of the load from 1 to h;
calculating the controllable load proportion according to the controllable load of the power grid in the isolated network and the total load of the power grid in the isolated network
Said X7For a controllable load proportion, PΣloadThe total load of the power grid in the isolated grid.
And step S109, calculating the network source load complementarity according to the load rate of any equipment and line.
It should be noted that calculating the network source load complementarity according to the load rate of any device and line specifically includes:
calculating the average value of the load rates of all the equipment and lines according to the load rate of any equipment and line, and calculating the load rate of the equipment and lineIs specifically shown as
Eta ofavgIs the average value of the load rates of all the equipment and lines, z is the total number of all the equipment and lines, and eta iswIs the load factor of any equipment and line;
calculating the standard deviation of the load rate according to the load rate of any equipment and line and the average value of the load rates of all the equipment and lines, wherein the calculation formula is specifically
The sigmaτIs the standard deviation of the load rate;
calculating the network source load complementarity according to the average value of the load rates of all the equipment and lines and the standard deviation of the load rates, wherein the calculation formula is specifically
Said X8The net source charge complementarity.
It should be further noted that steps S102 to S109 are not sequential, and may be performed simultaneously, or may be performed in any order.
And S110, sequentially constructing a correlation matrix according to the power receiving proportion, the heavy load rate, the power supply complementation rate, the generator set standby coefficient, the cooperativity, the influence of grid-related parameter switching on the power generation amount of a power grid, the controllable load proportion and the grid source load complementarity.
Specifically, sequentially constructing a correlation matrix according to the plurality of groups of the power receiving proportion, the heavy load rate, the power supply complementation rate, the generator set standby coefficient, the cooperativity, the influence of grid-related parameter switching on the power generation capacity of the power grid, the controllable load proportion and the grid source load complementarity comprises:
constructing an incidence matrix
I represents the number of data groups, i is more than or equal to 1 and less than or equal to m, and m represents the number of data groups more than i; the j tableAnd j is less than or equal to 1 and less than or equal to n, and n is 8.
Step S111, calculating the correlation coefficient and the index weight according to the correlation matrix specifically includes:
presetting a reference sequence X0＝(X00,X01,...,X0j,...,X0n)；
Calculating the absolute value of the difference value of each element of the incidence matrix and the element corresponding to each element in the preset reference number sequence, wherein the calculation formula is [ delta ]k]＝(zk-z0) N, where k is the number of data sets, zkFor the kth group of data elements of the correlation matrix, z0For data elements of a predetermined reference sequence, said [ Delta ]k]Obtaining an absolute value of a difference value of each element of the incidence matrix and an element corresponding to each element in the preset reference number sequence;
the correlation coefficient is calculated by the formula
Xi isijAs a correlation coefficient, said Δi,jThe difference value of the correlation matrix and the preset reference number sequence is obtained, and rho is a resolution coefficient;
order to
Push out
ρ (n) }, ρ (k) values include:
when in use
When the value is equal to 1.5 epsilon (k);
when in use
When the value is equal to 2 epsilon (k), taking rho (k);
when in use
When the value is greater than the predetermined value, taking rho (k) as 0.9;
when epsilon (k) is 0, taking a value randomly;
according to the said Δi,jCalculating the correlation coefficient xiij；
Entropy value defining the ith evaluation index
The Hi is the entropy of the ith evaluation index, and the fijIs the proportion of the ith proposal in the jth index;
calculating fijIs specifically shown as
Said XijIs the jth element of the ith group of data;
when f isijWhen equal to 0, fij ln fij＝0；
The entropy weight of the ith evaluation index is defined as
And satisfy the conditions
Calculating to obtain index weight W ═ omega1,ω2,...,ωn}。
And step S112, calculating an evaluation score according to the correlation coefficient and the index weight, and determining an evaluation result according to the evaluation score and a preset evaluation range.
Step S112 specifically includes:
the formula for calculating the evaluation score is specifically
Φi∈[0，1]2,3, said i ═ m; j 1,2, n, ωjIs the weight, ξ, of the jth indexi(j) Is a correlation coefficient.
As shown in fig. 2, the present invention provides an isolated network autonomous operation capability assessment apparatus, including:
an obtaining unit 201, configured to obtain parameters of a power grid in an isolated grid, the parameters of the isolated power grid comprise power received and input on a single external tie line in the isolated power grid, the number of the external tie lines, total load of the power grid in the isolated power grid, the number of equipment and lines in a heavy load state, the total number of the equipment and the lines, the generated energy of each generator set and the attributive type of each generator set, the controllable attribute of each generator set, the generated energy sum of the generator sets when the grid-related parameters are switched according to specific settings, the generated energy sum of the generator sets when the effect is optimal in the grid-related parameter switching, the generated energy sum of the generator sets when the effect is the worst in the grid-related parameter switching, the standby capacity and rated power of each generator set, the power of each level of load, participation factors of each level of load, the level of load and the load rate of any equipment;
the first calculating unit 202 is configured to calculate a power receiving ratio according to power received and input by a single external tie line in an isolated network, the number of the external tie lines, and a total load of a power grid in the isolated network;
a second calculating unit 203, configured to calculate a reloading rate according to the number of devices and lines in the reloading state and the total number of devices and lines;
the third calculating unit 204 is configured to calculate a power supply complementation rate according to the generated energy of each generator set and the attributive type of each generator set;
a fourth calculating unit 205, configured to calculate a generator set standby coefficient according to the standby capacity and the rated power of each generator set;
a fifth calculation unit 206 for calculating cooperativity from the power generation amount of each generator set and the controllable attribute of each generator set;
a sixth calculating unit 207, configured to calculate an influence of the grid-related parameter switching on the power generation amount of the power grid according to the power generation amount sum of the power generation unit when the grid-related parameters are switched according to the specific setting, the power generation amount sum of the power generation unit when the effect is optimal in the grid-related parameter switching, and the power generation amount sum of the power generation unit when the effect is worst in the grid-related parameter switching;
the seventh calculating unit 208 is configured to calculate a controllable load proportion according to the power of each level of load, the participation factor of each level of load, and the total load of the power grid in the isolated grid and the level of the load;
an eighth calculating unit 209, configured to calculate network source load complementarity according to load rates of any one of the devices and the line;
a constructing unit 210, configured to construct a correlation matrix according to the power receiving ratio, the heavy load ratio, the power supply complementation ratio, the generator set standby coefficient, an influence of grid-related parameter switching on a power generation amount of a power grid, the cooperativity, the controllable load ratio, and the grid source load complementarity;
a ninth calculating unit 211, configured to calculate a correlation coefficient and an index weight according to the correlation matrix;
and the evaluation unit 212 is used for calculating an evaluation score according to the correlation coefficient and the index weight, and determining an evaluation result according to the evaluation score and a preset evaluation range.
As shown in fig. 3, the invention provides an isolated grid structure, which uses a three-phase power supply model as an external grid model connected to a main grid, is provided with a plurality of transformers with corresponding voltage levels, and uses the voltage levels as a regional grid partition standard to divide the regional grid into 3 segments. Meanwhile, the structure diagram comprises 4 generator set models, and each generator set is provided with a transformer for supplying power to a corresponding district load. The whole power grid has 28 load nodes, and the system frequency is 50 Hz.
1) Local isolated network parameter setting
The load parameters and the generator set model parameters of each partition are shown in the following table 1:
TABLE 1 three zoned grading loads and Generator parameters
2) Assessment data collection
According to the established simulation system, acquiring the power receiving ratio X according to the comprehensive evaluation index system of the source-load coordination support capability of the isolated operation network of the local power grid with the high power receiving ratio determined in the previous step1Running state X2Different units form X3Multi-unit adjustable capacity X4Synergistic property X of output5Influence X of switching of grid-related parameters6Multi-stage load-reducing X7Local power grid source-load complementary coordination X8The related data, specific information is as follows in table 2:
table 2 evaluation data collection
TABLE 3 evaluation results of typical samples
The evaluation result was determined to be excellent with a preset evaluation range of [1,0.75), [0.75,0.5) to be medium, [0.5,0.25) to be acceptable, and [0.25,0] to be unacceptable.
The implementation of the invention has the following beneficial effects:
according to the method and the device, the parameters of the isolated power grid are obtained, the power receiving proportion, the heavy load rate, the power supply complementary rate, the standby coefficient, the cooperativity, the influence of the switching of the grid-related parameters on the power generation capacity of the power grid, the controllable load proportion and the grid source complementary performance are calculated according to the parameters of the isolated power grid, the incidence matrix is formed according to the parameters, the incidence coefficient and the index weight are calculated, the evaluation score is calculated according to the incidence coefficient and the index weight, the evaluation result is determined according to the evaluation score and the preset evaluation range, and the problem that the scientific basis is lacked in the design and fault solution of the isolated power grid due to the lack of an effective evaluation means in the existing isolated.
One of ordinary skill will appreciate that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A method for evaluating the autonomous operation capability of an isolated network is characterized by comprising the following steps:
acquiring parameters of an isolated power grid, wherein the parameters of the isolated power grid comprise power received and input on a single external contact line in the isolated power grid, the number of the external contact lines, total load of the power grid in the isolated power grid, the number of equipment and lines in a heavy-load state, the total number of the equipment and the lines, the generated energy of each generator set and the attributive type of each generator set, controllable attributes of each generator set, the generated energy sum of the generator sets when the grid-related parameters are switched according to specific settings, the generated energy sum of the generator sets when the effect is optimal in the switching of the grid-related parameters, the generated energy sum of the generator sets when the effect is worst in the switching of the grid-related parameters, the standby capacity and the rated power of each generator set, the power of each level of load, the participation factor of each level of load, the level of load;
calculating the power receiving proportion according to the power received and input by a single external connecting line in the isolated network, the number of the external connecting lines and the total load of the power grid in the isolated network;
calculating the reloading rate according to the number of the equipment and the lines in the reloading state and the total number of the equipment and the lines;
calculating the power supply complementation rate according to the generated energy of each generator set and the attributive type of each generator set;
calculating a standby coefficient of the generator set according to the standby capacity and the rated power of each generator set;
calculating the cooperativity according to the generated energy of each generator set and the controllable attribute of each generator set;
calculating the influence of the grid-related parameter switching on the power generation amount of the power grid according to the power generation amount sum of the power generation units when the grid-related parameters are switched according to the specific setting, the power generation amount sum of the power generation units when the effect is optimal in the grid-related parameter switching, and the power generation amount sum of the power generation units when the effect is worst in the grid-related parameter switching;
calculating a controllable load proportion according to the power of each level of load, the participation factor of each level of load, the total load of the power grid in the isolated network and the level of the load;
calculating the network source load complementarity according to the load rate of any equipment and line;
constructing an incidence matrix according to the influence of the power receiving proportion, the heavy load rate, the power supply complementation rate, the generator set standby coefficient, grid-related parameter switching on the power generation amount of a power grid, the cooperativity, the controllable load proportion and the grid source load complementarity;
calculating a correlation coefficient and an index weight according to the correlation matrix;
and calculating an evaluation score according to the correlation coefficient and the index weight, and determining an evaluation result according to the evaluation score and a preset evaluation range.
2. The method of claim 1, wherein calculating the power receiving proportion based on the power received on a single external tie in the orphan network, the number of external ties, and the total load on the network in the orphan network comprises:
the formula for calculating the power receiving ratio is specifically
Said X1In an electric power receiving ratio of PlurReceiving input power on a single external tie line in the isolated network, wherein k is the number of the external tie lines and P∑loadRepresenting the total load on the grid.
3. The method of claim 1, wherein calculating the power supply complementation rate according to the power generation capacity of each generator set and the attribution type of each generator set comprises:
calculating the total power generation of each type of generator set according to the power generation of each generator set and the attributive type of each generator set;
calculating the average value of the generated energy of the generator set with the maximum total generated energy, wherein the calculation formula is specifically
The P ismavgThe average value of the generated energy of the generator sets of the type with the maximum total generated energy is PmiThe power generation amount of each generator set belonging to the class of generator sets with the maximum total power generation amount is represented by p, and the number of the generator sets belonging to the class of generator sets with the maximum total power generation amount is represented by p;
calculating the standard deviation of the generated energy of the one type of generating set with the maximum total generated energy according to the generated energy average value of the one type of generating set with the maximum total generated energy and the generated energy of each generating set belonging to the one type of generating set with the maximum total generated energy, wherein the calculation formula is specifically
The sigmaAThe standard deviation of the generated energy of the generator set of the type with the maximum total generated energy is obtained;
calculating the average value of the generated energy of all the generator sets, wherein the calculation formula is specifically
The P isavgFor the generation of all the generator setsAverage value of said PiThe power generation amount of a single generator set is q, and the q is the total number of the generator sets;
calculating according to the generated energy of the single generator set and the average value of the generated energy of all the generator sets
The calculation formula of the standard deviation of the generated energy of all the generator sets is specifically
The sigmaBGenerating capacity standard deviation of all the generator sets;
calculating the power supply complementation rate according to the generated energy standard deviation of the one type of generating set with the maximum total generated energy and the generated energy standard deviations of all the generating sets, wherein the formula for calculating the power supply complementation rate is specifically
Said X3Is the power supply complementation rate.
4. The method of claim 1, wherein calculating the influence of the grid-related parameter switching on the grid power generation amount according to the sum of the power generation amounts of the generator sets when the grid-related parameters are switched according to the specific settings, the sum of the power generation amounts of the generator sets when the effect in the grid-related parameter switching is optimal, and the sum of the power generation amounts of the generator sets when the effect in the grid-related parameter switching is worst specifically comprises:
the formula for calculating the influence of grid-related parameter switching on the power generation capacity of the power grid is specifically
Said X6The sigma P is used for influencing the power generation capacity of the power grid by switching grid related parametersiThe sum of the generated energy of the generator set when the grid-related parameters are switched according to a specific setting, the sigma PoThe summation of the generated energy of the generator set with the optimal effect in the network-related parameter switching is sigma PwThe power generation amount of the generator set with the worst effect in the network-related parameter switching is the sum.
5. The method as claimed in claim 1, wherein the step of calculating the controllable load proportion according to the power of each stage of load, the participation factor of each stage of load, the total load of the power grid in the isolated grid and the stage number of the load comprises:
calculating the controllable load of the power grid in the isolated network according to the power of each level of load, the participation factor of each level of load and the level of load, and calculating the controllable load of the power grid in the isolated network
The P islcFor the controllable load of the power grid in the isolated grid, kvFor each level of load participation factor, PlvFor the power of each level of load, h is the stage number of the current load, and v is the stage number of the load from 1 to h;
calculating the controllable load proportion according to the controllable load of the power grid in the isolated network and the total load of the power grid in the isolated network
Said X7For a controllable load proportion, PΣloadThe total load of the power grid in the isolated grid.
6. The method of claim 1, wherein calculating network source load complementarity based on a load rate of any one of the device and the line specifically comprises:
calculating the average value of the load rates of all the equipment and the lines according to the load rate of any equipment and line, wherein the calculation formula is specifically
Eta ofavgIs the average value of the load rates of all the equipment and lines, z is the total number of all the equipment and lines, and eta iswIs the load factor of any equipment and line;
calculating the standard deviation of the load rate according to the load rate of any equipment and line and the average value of the load rates of all the equipment and lines, wherein the calculation formula is specifically
The sigmaτIs the standard deviation of the load rate;
calculating the network source load complementarity according to the average value of the load rates of all the equipment and lines and the standard deviation of the load rates, wherein the calculation formula is specifically
Said X8The net source charge complementarity.
7. The method of claim 1, wherein sequentially constructing a correlation matrix according to the power receiving proportion, the overloading rate, the power source complementation rate, the generator set backup factor, the influence of grid-related parameter switching on grid power generation, the cooperativity, the controllable load proportion, and the grid source load complementation specifically comprises:
constructing an incidence matrix
I represents the number of data groups, i is more than or equal to 1 and less than or equal to m, and m represents the number of data groups which is more than or equal to i; j represents the element quantity of each group of data elements, j is more than or equal to 1 and less than or equal to n, and n is 8.
8. The method of claim 7, wherein calculating the correlation coefficient and the index weight according to the correlation matrix specifically comprises:
presetting a reference sequence X0＝(X00,X01,...,X0j,...,X0n)；
Calculating the absolute value of the difference value of each element of the incidence matrix and the element corresponding to each element in the preset reference number sequence, wherein the calculation formula is [ delta ]k]＝(zk-z0) N, where k is the number of data sets, zkFor the kth group of data elements of the correlation matrix, z0For data elements of a predetermined reference sequence, said [ Delta ]k]For each element of the incidence matrix and each element in the preset reference number sequenceAbsolute value of the corresponding element difference;
the correlation coefficient is calculated by the formula
Xi isijAs a correlation coefficient, said Δi,jThe difference value of the correlation matrix and the preset reference number sequence is obtained, and rho is a resolution coefficient;
order to
Push out
ρ (n) }, ρ (k) values include:
when in use
When the value is equal to 1.5 epsilon (k);
when in use
When the value is equal to 2 epsilon (k), taking rho (k);
when in use
When the value is greater than the predetermined value, taking rho (k) as 0.9;
when epsilon (k) is 0, taking a value randomly;
according to the said Δi,jCalculating the correlation coefficient xiij；
Entropy value defining the ith evaluation index
The Hi is the entropy of the ith evaluation index, and the fijIs the proportion of the ith proposal in the jth index;
calculating fijIs specifically shown as
Said XijIs the jth element of the ith group of data;
when f isijWhen equal to 0, fijlnfij＝0；
The entropy weight of the ith evaluation index is defined as
And satisfy the conditions
Calculating to obtain index weight W ═ omega1,ω2,...,ωn}。
9. The method of claim 8, wherein calculating an evaluation score based on the correlation coefficient and the metric weight specifically comprises:
the formula for calculating the evaluation score is specifically
2,3, a. j 1,2, n, ωjIs the weight, ξ, of the jth indexi(j) Is a correlation coefficient.
10. An isolated network autonomous operation capability assessment apparatus, the apparatus comprising:
an acquisition unit for acquiring parameters of the isolated grid power grid, the parameters of the isolated power grid comprise power received and input on a single external tie line in the isolated power grid, the number of the external tie lines, total load of the power grid in the isolated power grid, the number of equipment and lines in a heavy load state, the total number of the equipment and the lines, the generated energy of each generator set and the attributive type of each generator set, the controllable attribute of each generator set, the generated energy sum of the generator sets when the grid-related parameters are switched according to specific settings, the generated energy sum of the generator sets when the effect is optimal in the grid-related parameter switching, the generated energy sum of the generator sets when the effect is the worst in the grid-related parameter switching, the standby capacity and rated power of each generator set, the power of each level of load, participation factors of each level of load, the level of load and the load rate of any equipment;
the first calculation unit is used for calculating the power receiving proportion according to the power received and input by a single external connecting line in the isolated network, the number of the external connecting lines and the total load of the power grid in the isolated network;
the second calculating unit is used for calculating the reloading rate according to the number of the equipment and the lines in the reloading state and the total number of the equipment and the lines;
the third calculating unit is used for calculating the power supply complementation rate according to the generated energy of each generator set and the attributive type of each generator set;
the fourth calculation unit is used for calculating the standby coefficient of each generator set according to the standby capacity and the rated power of each generator set;
the fifth calculation unit is used for calculating the cooperativity according to the power generation amount of each generator set and the controllable attribute of each generator set;
the sixth calculating unit is used for calculating the influence of the grid-related parameter switching on the power generation of the power grid according to the power generation sum of the power generation units when the grid-related parameters are switched according to the specific setting, the power generation sum of the power generation units when the effect is optimal in the grid-related parameter switching, and the power generation sum of the power generation units when the effect is worst in the grid-related parameter switching;
the seventh calculating unit is used for calculating the controllable load proportion according to the power of each level of load, the participation factor of each level of load, the total load of the power grid in the isolated network and the level of the load;
the eighth calculating unit is used for calculating the network source load complementarity according to the load rate of any equipment and line;
the construction unit is used for constructing a correlation matrix according to the influence of the power receiving proportion, the heavy load rate, the power supply complementation rate, the generator set standby coefficient and the grid-related parameter switching on the power generation amount of a power grid, the cooperativity, the controllable load proportion and the grid source load complementarity;
a ninth calculating unit, configured to calculate a correlation coefficient and an index weight according to the correlation matrix;
and the evaluation unit is used for calculating an evaluation score according to the correlation coefficient and the index weight and determining an evaluation result according to the evaluation score and a preset evaluation range.
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