CN112821452A - Multifunctional steady-state power regulation and control method and system of flexible multi-state switch - Google Patents
Multifunctional steady-state power regulation and control method and system of flexible multi-state switch Download PDFInfo
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a multifunctional steady-state power regulation and control method of a flexible multi-state switch, which comprises the following steps: determining an importance degree evaluation value of each function of the flexible switch according to the influence degree of each function of the flexible multi-state switch on the power distribution network in terms of reliability and economy; determining a judgment value of relative importance degree between each two functions according to the importance degree evaluation value of each function, and constructing a judgment matrix; calculating the weight of each function according to the judgment matrix; taking the weight of each function as the coefficient of the parameter index of each function in the multifunctional steady-state objective function of the flexible multi-state switch, and solving the multifunctional steady-state objective function to obtain the port capacity of the flexible multi-state switch; the port capacity of the flexible multi-state switch is allocated according to the weight of each function. The invention realizes the steady-state regulation function of reasonably distributing the flexible multi-state switch and further realizes the maximum utilization of the port power of the flexible multi-state switch.
Description
Technical Field
The invention relates to the technical field of flexible multi-state switch control, in particular to a multifunctional steady-state power regulation and control method and system of a flexible multi-state switch.
Background
After distributed power sources such as wind energy, light energy and the like are connected to a power distribution network, various dispersed renewable energy sources are fully utilized, the utilization rate of the energy sources is effectively improved, and the current situation that fossil fuels are gradually in short supply in recent years is relieved. The rational distribution and arrangement of distributed power sources also has many positive effects on the power grid, including effective reduction of line loss, improvement of system safety and reliability, peak clipping and valley filling, reduction of environmental pressure, reduction of power transmission and distribution costs, and the like. However, with the continuous improvement of the permeability and the capacity of the distributed power supply connected to the power distribution network, the consumption of the distributed power supply also becomes a difficult problem to be solved urgently at present, and meanwhile, due to the fluctuation and the randomness of the output of the distributed power supply, system voltage fluctuation can be generated, so that a load overload phenomenon can be caused, and along with the problems of harmonic waves, three-phase imbalance and other electric energy quality, the problems can cause great influence on the safe and stable operation of the power distribution network.
In recent years, with the rapid development of various new power electronic devices, their application in the field of power distribution networks is also a research focus of researchers. The flexible equipment which takes the power electronic device as a main body in the field of the power distribution network has the advantages of enhancing the flexibility of the operation of the power distribution network, improving the topological structure of the power distribution network, optimizing the trend flow direction and the like, and is the development trend of the future intelligent power distribution network. The flexible multi-state switch is flexible primary equipment applied to the power distribution network, and has the main function of replacing a contact switch in the traditional power distribution network, so that a connection part has two states of on and off, and a power continuous adjustable state is provided, the operation control mode is flexible and various, and the problems of unreasonable structure, limited regulation and control means and the like of the current power distribution network can be solved. In the aspect of steady state regulation and control of the power distribution network, the flexible multi-state switch has multiple functions of promoting distributed power consumption, inhibiting voltage fluctuation, improving electric energy quality, performing multi-terminal power mutual aid and the like, and can effectively improve the steady state operation capacity of the power distribution network.
In the prior art, for example, in the high voltage technology, a power distribution network voltage fluctuation stabilizing strategy based on a flexible multi-state switch, such as the principle of Zhao national Peng, Liu Si Yuan, Zhou Xin Wei, Wang, Yangyong and permissive, is analyzed and proposed to realize a voltage fluctuation stabilizing function by raising the voltage at the head end of a line by the flexible multi-state switch. In the prior art, a power supply recovery strategy of a three-port flexible multi-state switch for power distribution network feeder interconnection is provided based on a power supply recovery strategy of the flexible multi-state switch under the condition that a single feeder is in power failure in the condition that a feeder of a beacon is in power failure, namely Zhangiang, Pengbo, Zhuyiming, Shencong, Wangbang and Schang in high voltage technology, so that an optimization scheme for performing power mutual aid on a fault feeder is realized. However, the above method only involves limited functions, and the considered demand and operation condition of the power distribution network are relatively single, and the flexible multi-state steady-state function is not comprehensively managed and distributed in a macroscopic aspect. In reality, the distribution network has various operation requirements, the steady-state regulation and control functions of the flexible multi-state switch can be reasonably distributed, the priority of function use is established, different distribution schemes are designed, and the maximization of the utilization of the port power of the flexible multi-state switch is a key problem encountered at present.
Disclosure of Invention
The invention aims to provide a multifunctional steady-state power regulation and control method and a system of a flexible multi-state switch, so as to realize reasonable distribution of a steady-state regulation and control function of the flexible multi-state switch and further realize maximum utilization of port power of the flexible multi-state switch.
In order to achieve the purpose, the invention provides the following scheme:
a multifunctional steady-state power regulation method of a flexible multi-state switch comprises the following steps:
determining an importance degree evaluation value of each function of the flexible switch according to the influence degree of each function of the flexible multi-state switch on the power distribution network in terms of reliability and economy;
determining a judgment value of relative importance degree between each two functions according to the importance degree evaluation value of each function, and constructing a judgment matrix;
calculating the weight of each function according to the judgment matrix;
taking the weight of each function as the coefficient of the parameter index of each function in the multifunctional steady-state objective function of the flexible multi-state switch, and solving the multifunctional steady-state objective function to obtain the port capacity of the flexible multi-state switch;
the port capacity of the flexible multi-state switch is allocated according to the weight of each function.
Optionally, the functions include distributed power supply absorption, voltage fluctuation stabilization, power conversion, compensation for three-phase imbalance, and/or harmonic elimination.
Optionally, the calculating the weight of each function according to the determination matrix specifically includes:
and calculating the judgment matrix by adopting a square root method to obtain the weight of each function.
Optionally, the calculating the judgment matrix by using a square root method to obtain the weight of each function specifically includes:
using formulas
Calculating the product of each row of elements in the judgment matrix; wherein M isiRepresenting the product of the elements of row i in the decision matrix, aijRepresenting the jth element in the ith row in the judgment matrix, and n representing the number of elements in each row in the judgment matrix;
using a formula based on the product of each line element
Calculating the geometric mean value of each row of elements; wherein,
representing the geometric mean value of the ith row element in the judgment matrix;
using formulas
Carrying out normalization calculation on the geometric mean value of each row of elements to obtain the weight of each function; wherein, ω isiRepresenting the weight of the ith function.
Optionally, the multi-functional steady-state objective function is: min F ═ ω1f1+ω2f2+ω3f3+ω4f4+ω5f5；
Wherein F is the multifunctional steady-state objective function value, F1、f2、f3、f4And f5Respectively representing parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination; omega1、ω2、ω3、ω4And ω5And the coefficients respectively represent parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination.
A multi-functional steady-state power regulation system of a flexible multi-state switch, the regulation system comprising:
the importance degree evaluation value determining module is used for determining an importance degree evaluation value of each function of the flexible switch according to the influence degree of each function of the flexible multi-state switch on the power distribution network in terms of reliability and economy;
the judgment matrix construction module is used for determining a judgment value of relative importance degree between each two functions according to the importance degree evaluation value of each function and constructing a judgment matrix;
the weight calculation module is used for calculating the weight of each function according to the judgment matrix;
the port capacity calculation module is used for taking the weight of each function as the coefficient of the parameter index of each function in the multifunctional steady-state objective function of the flexible multi-state switch, solving the multifunctional steady-state objective function and obtaining the port capacity of the flexible multi-state switch;
and the port capacity distribution module is used for distributing the port capacity of the flexible multi-state switch according to the weight of each function.
Optionally, the functions include distributed power supply absorption, voltage fluctuation stabilization, power conversion, compensation for three-phase imbalance, and/or harmonic elimination.
Optionally, the weight calculating module specifically includes:
and the weight calculation submodule is used for calculating the judgment matrix by adopting a square root method to obtain the weight of each function.
Optionally, the weight calculating sub-module specifically includes:
a product calculation unit for using the formula
Calculating the product of each row of elements in the judgment matrix; wherein M isiRepresenting the product of the elements of row i in the decision matrix, aijRepresenting the jth element in the ith row in the judgment matrix, and n representing the number of elements in each row in the judgment matrix;
a geometric mean calculation unit for using a formula according to the product of each row element
Calculating the geometric mean value of each row of elements; wherein,
representing the geometric mean value of the ith row element in the judgment matrix;
a weight calculation unit for using the formula
Carrying out normalization calculation on the geometric mean value of each row of elements to obtain the weight of each function; wherein, ω isiRepresenting the weight of the ith function.
Optionally, the multi-functional steady-state objective function is: min ═ omega1f1+ω2f2+ω3f3+ω4f4+ω5f5；
Wherein F is the multifunctional steady-state objective function value, F1、f2、f3、f4And f5Respectively representing parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination; omega1、ω2、ω3、ω4And ω5And the coefficients respectively represent parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a multifunctional steady-state power regulation and control method of a flexible multi-state switch, which comprises the following steps: determining an importance degree evaluation value of each function of the flexible switch according to the influence degree of each function of the flexible multi-state switch on the power distribution network in terms of reliability and economy; determining a judgment value of relative importance degree between each two functions according to the importance degree evaluation value of each function, and constructing a judgment matrix; calculating the weight of each function according to the judgment matrix; taking the weight of each function as the coefficient of the parameter index of each function in the multifunctional steady-state objective function of the flexible multi-state switch, and solving the multifunctional steady-state objective function to obtain the port capacity of the flexible multi-state switch; the port capacity of the flexible multi-state switch is allocated according to the weight of each function. The invention considers that the flexible multi-state switch has various steady-state regulation and control functions in the power distribution network, and needs to reasonably distribute the port power of the flexible multi-state switch to the steady-state functions from different operation conditions and actual requirements, thereby realizing reasonable distribution of the steady-state regulation and control functions of the flexible multi-state switch and further realizing maximum utilization of the port power of the flexible multi-state switch.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a multi-functional steady-state power regulation method of a flexible multi-state switch provided by the present invention;
FIG. 2 is a topological structure diagram of a flexible multi-state switch provided by the present invention;
fig. 3 is a flowchart of a multifunctional steady-state power regulation method of a flexible multi-state switch provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a multifunctional steady-state power regulation and control method and a system of a flexible multi-state switch, so as to realize reasonable distribution of a steady-state regulation and control function of the flexible multi-state switch and further realize maximum utilization of port power of the flexible multi-state switch.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic diagram of a multifunctional steady-state power regulation method of a flexible multi-state switch according to the present invention, and as shown in fig. 1, in consideration of that the flexible multi-state switch has multiple steady-state regulation functions in a power distribution network, port power of the flexible multi-state switch needs to be reasonably distributed to the steady-state functions from different operating conditions and actual requirements. The priority of each function needs to be determined first, and then the corresponding weights of the different functions need to be calculated, so that the order and proportion of the power distribution can be obtained.
The flexible multi-state switch disclosed by the invention is shown in figure 2 and comprises a distribution network A, a distribution network B and a distribution network C, wherein an end A and an end B operate in a rectification state, an end C operates in an inversion state, and an end Z operates in an inversion stateA、ZB、ZCIs the device triac side impedance. In the context of figure 2, it is shown,
active power exchanged between the three ports of the flexible multi-state switch and the power distribution system is respectively;
respectively, the reactive power exchanged between the three ports of the flexible multi-state switch and the power distribution system.
Specifically, as shown in fig. 3, the invention provides a multifunctional steady-state power regulation method of a flexible multi-state switch, which includes the following steps:
and 301, determining an importance degree evaluation value of each function of the flexible switch according to the influence degree of each function of the flexible multi-state switch on the power distribution network in terms of reliability and economy.
From different operating conditions and actual demands, the priority order is established by analyzing the influence degree of different functions on the power distribution network in the aspects of economy, reliability and the like under the conditions.
If the evaluation value of the function A is set to be 1, then the evaluation values of the functions are obtained according to the previous priority ranking. If the function B is slightly more important than the function A, the evaluation value of the function B is B, and so on. The evaluation values obtained are shown in Table 1.
TABLE 1 evaluation value Table
After the evaluation value table is obtained, a judgment matrix which can judge and compare the importance of every two factors needs to be constructed to represent the relative importance judgment value between different indexes of the same level. Since the index a is important as compared with itself, the diagonal element of the formed determination matrix is always 1. After the index A is compared with the index B, the corresponding evaluation value a is obtainedijThen, when B and A are compared, the evaluation value a can be directly obtainedji＝1/aij. It can be seen that to obtain a decision matrix of order n × n, only n (n-1)/2 decision values need to be obtained.
The functions of distributed power supply absorption, voltage fluctuation stabilization, power conversion, three-phase imbalance compensation and harmonic elimination are represented by A, B, C, D, E respectively, so that a corresponding judgment matrix table obtained according to the analysis is shown in table 2.
TABLE 2 decision matrix Table
| J | A | B | C | D | E |
| A | 1 | b | c | d | e |
| B | 1/b | 1 | c/b | d/b | e/b |
| C | 1/c | b/c | 1 | d/c | e/c |
| D | 1/d | b/d | c/d | 1 | e/d |
| E | 1/e | b/e | c/e | d/e | 1 |
And 303, calculating the weight of each function according to the judgment matrix.
After the judgment matrix is obtained, mathematical processing needs to be performed on the judgment matrix to obtain the weight coefficient. The maximum eigenvalue and the eigenvector of the judgment matrix J can be judged by a calculation method, and the analytic hierarchy process has low requirement on the calculation precision and is generally solved by an approximation method. The commonly used methods include a summation method, an improved summation method, a root method and the like. The square root method is more accurate than the sum method, so the maximum eigenvalue and the eigenvector of the judgment matrix J are solved by adopting the square root method.
Calculating the judgment matrix by adopting a square root method to obtain the weight of each function, and specifically comprising the following steps: using formulas
Calculating the product of each row of elements in the judgment matrix; wherein M isiRepresenting the product of the elements of row i in the decision matrix, aijRepresenting the jth element in the ith row in the judgment matrix, and n representing the number of elements in each row in the judgment matrix; using a formula based on the product of each line element
Calculating the geometry of each line of elementsAverage value; wherein,
representing the geometric mean value of the ith row element in the judgment matrix; using formulas
Carrying out normalization calculation on the geometric mean value of each row of elements to obtain the weight of each function; wherein, ω isiRepresenting the weight of the ith function.
Therefore, the judgment matrix shown in table 1-2 is calculated, and a weight list for solving five functions D of distributed power supply absorption (A), voltage fluctuation stabilization (B), power transfer (C), three-phase imbalance compensation (D) and harmonic elimination (E) is shown in table 3.
TABLE 3 weight List
| Index (I) | A | B | C | D | E |
| Weight coefficient | ω1 | ω2 | ω3 | ω4 | ω5 |
And the weight coefficient obtained by the analytic hierarchy process satisfies:
ω1+ω2+ω3+ω4+ω5＝1
and 304, taking the weight of each function as a coefficient of a parameter index of each function in a multifunctional steady-state objective function of the flexible multi-state switch, and solving the multifunctional steady-state objective function to obtain the port capacity of the flexible multi-state switch.
The multifunctional steady-state objective function is: min ═ omega1f1+ω2f2+ω3f3+ω4f4+ω5f5；
Wherein F is the multifunctional steady-state objective function value, F1、f2、f3、f4And f5Respectively representing parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination; omega1、ω2、ω3、ω4And ω5And the coefficients respectively represent parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination.
Specifically, the parameter indexes corresponding to the five different functions are respectively a voltage offset rate, a distributed power output condition, a load rate, a three-phase unbalance degree and a harmonic distortion rate, and are respectively represented by f1、f2、f3、f4、f5And (4) showing. Comprehensively considering the above five system operation indexes, converting the distribution problem of the stable power of the flexible multi-state switch into a multi-target weight distribution problem, wherein the weight coefficients of the five functions to be solved are omega1、ω2、ω3、ω4、ω5. The invention solves the multi-target distribution problem by adopting an analytic hierarchy process, and converts a plurality of targets into a single target F by adopting a linear weighted sum method, wherein the single optimized target F depends on the formulaIt is necessary to make these targets uniform on the same scale according to what kind of working conditions and requirements.
min F＝ω1f1+ω2f2+ω3f3+ω4f4+ω5f5
Wherein, ω is1+ω2+ω3+ω4+ω5＝1。
And 305, allocating the port capacity of the flexible multi-state switch according to the weight of each function.
If the total power of a certain port of the flexible multi-state switch is P, the flexible multi-state switch has
Function a is allocated power as: p1＝ω1P；
Function B is allocated power of: p2＝ω2P；
Function C is allocated power of: p3＝ω3P；
Function D is allocated power of: p4＝ω4P；
Function E is allocated power of: p5＝ω5P；
Wherein P is1+P2+P3+P4+P5＝P，ω1+ω2+ω3+ω4+ω5＝1。
Therefore, the capacity of the flexible multi-state switch can be allocated according to the priority and the weight coefficient of the function, so that the capacity of the flexible multi-state switch is utilized to the maximum extent. This is one of the allocation methods, and others require re-prioritizing and calculating weighting coefficients based on the relevant conditions and theoretical support.
Of course, all the working conditions do not need to be participated in the five functions, and if one or more functions are lacked, corresponding columns or rows in corresponding matrixes need to be removed in weight calculation, and then weights are recalculated by referring to corresponding formulas.
A multi-functional steady-state power regulation system of a flexible multi-state switch, the regulation system comprising:
and the importance degree evaluation value determining module is used for determining the importance degree evaluation value of each function of the flexible switch according to the influence degree of each function of the flexible multi-state switch on the power distribution network in terms of reliability and economy. The functions include distributed power supply rejection, voltage fluctuation smoothing, power transfer, compensation for three-phase imbalance, and/or harmonic cancellation.
And the judgment matrix construction module is used for determining a judgment value of the relative importance degree between each two functions according to the importance degree evaluation value of each function and constructing a judgment matrix.
And the weight calculation module is used for calculating the weight of each function according to the judgment matrix.
The weight calculation module specifically includes: and the weight calculation submodule is used for calculating the judgment matrix by adopting a square root method to obtain the weight of each function.
The weight calculation submodule specifically includes: a product calculation unit for using the formula
Calculating the product of each row of elements in the judgment matrix; wherein M isiRepresenting the product of the elements of row i in the decision matrix, aijRepresenting the jth element in the ith row in the judgment matrix, and n representing the number of elements in each row in the judgment matrix; a geometric mean calculation unit for using a formula according to the product of each row element
Calculating the geometric mean value of each row of elements; wherein,
representing the geometric mean value of the ith row element in the judgment matrix; a weight calculation unit for using the formula
Carrying out normalization calculation on the geometric mean value of each row of elements to obtain the weight of each function; wherein, ω isiRepresenting the weight of the ith function.
And the port capacity calculation module is used for taking the weight of each function as the coefficient of the parameter index of each function in the multifunctional steady-state objective function of the flexible multi-state switch, solving the multifunctional steady-state objective function and obtaining the port capacity of the flexible multi-state switch.
The multifunctional steady-state objective function is: min ═ omega1f1+ω2f2+ω3f3+ω4f4+ω5f5；
Wherein F is the multifunctional steady-state objective function value, F1、f2、f3、f4And f5Respectively representing parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination; omega1、ω2、ω3、ω4And ω5And the coefficients respectively represent parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination.
And the port capacity distribution module is used for distributing the port capacity of the flexible multi-state switch according to the weight of each function.
Compared with the prior art, the invention has the beneficial effects that:
compared with the existing flexible multi-state steady-state regulation technology, the invention provides a steady-state regulation strategy based on a multifunctional flexible multi-state switch, and after the priority of the function is analyzed from a certain angle, the weights of different functions are calculated by utilizing an analytic hierarchy process, so that the use sequence of the functions is obtained, the power distribution proportion of the flexible multi-state switch port to each function is also obtained, and the port power can be utilized to the maximum extent.
Compared with the existing flexible multi-state steady state regulation and control technology, the method has the advantages that various steady state functions are considered at the same time, the steady state functions are comprehensively distributed from the macroscopic aspect, and the regulation and control capability of the functions is greatly improved.
Compared with the existing flexible multi-state steady-state regulation and control technology, the method has the advantages that the method is not only suitable for one requirement or working condition, can be popularized to more practical use conditions according to the method for analyzing and calculating the content, and has wide applicability and practicability.
The equivalent embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts between the equivalent embodiments can be referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.
Claims (10)
1. A multifunctional steady-state power regulation method of a flexible multi-state switch is characterized by comprising the following steps:
determining an importance degree evaluation value of each function of the flexible switch according to the influence degree of each function of the flexible multi-state switch on the power distribution network in terms of reliability and economy;
determining a judgment value of relative importance degree between each two functions according to the importance degree evaluation value of each function, and constructing a judgment matrix;
calculating the weight of each function according to the judgment matrix;
taking the weight of each function as the coefficient of the parameter index of each function in the multifunctional steady-state objective function of the flexible multi-state switch, and solving the multifunctional steady-state objective function to obtain the port capacity of the flexible multi-state switch;
the port capacity of the flexible multi-state switch is allocated according to the weight of each function.
2. The method of claim 1, wherein the functions comprise distributed power supply rejection, voltage fluctuation smoothing, power transfer, compensation for three-phase imbalance, and/or harmonic cancellation.
3. The method according to claim 1, wherein the calculating the weight of each function according to the determination matrix specifically comprises:
and calculating the judgment matrix by adopting a square root method to obtain the weight of each function.
4. The method according to claim 3, wherein the calculating the decision matrix by a square root method to obtain the weight of each function comprises:
using formulas
Calculating the product of each row of elements in the judgment matrix; wherein M isiRepresenting the product of the elements of row i in the decision matrix, aijRepresenting the jth element in the ith row in the judgment matrix, and n representing the number of elements in each row in the judgment matrix;
using a formula based on the product of each line element
Calculating the geometric mean value of each row of elements; wherein,
representing the geometric mean value of the ith row element in the judgment matrix;
using formulas
Carrying out normalization calculation on the geometric mean value of each row of elements to obtain the weight of each function; wherein, ω isiRepresenting the weight of the ith function.
5. The method of claim 1, wherein the multi-functional steady-state objective function is: min F ═ ω1f1+ω2f2+ω3f3+ω4f4+ω5f5；
Wherein F is the multifunctional steady-state objective function value, F1、f2、f3、f4And f5Respectively representing parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination; omega1、ω2、ω3、ω4And ω5And the coefficients respectively represent parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination.
6. A multi-functional steady-state power regulation system for a flexible multi-state switch, the regulation system comprising:
the importance degree evaluation value determining module is used for determining an importance degree evaluation value of each function of the flexible switch according to the influence degree of each function of the flexible multi-state switch on the power distribution network in terms of reliability and economy;
the judgment matrix construction module is used for determining a judgment value of relative importance degree between each two functions according to the importance degree evaluation value of each function and constructing a judgment matrix;
the weight calculation module is used for calculating the weight of each function according to the judgment matrix;
the port capacity calculation module is used for taking the weight of each function as the coefficient of the parameter index of each function in the multifunctional steady-state objective function of the flexible multi-state switch, solving the multifunctional steady-state objective function and obtaining the port capacity of the flexible multi-state switch;
and the port capacity distribution module is used for distributing the port capacity of the flexible multi-state switch according to the weight of each function.
7. The multifunctional steady-state power regulation system of a flexible multi-state switch of claim 6 wherein the functions comprise distributed power supply rejection, voltage fluctuation smoothing, power transfer, compensation for three-phase imbalance, and/or harmonic cancellation.
8. The system of claim 6, wherein the weight calculation module comprises:
and the weight calculation submodule is used for calculating the judgment matrix by adopting a square root method to obtain the weight of each function.
9. The system of claim 8, wherein the weight computation submodule comprises:
a product calculation unit for using the formula
Calculating the product of each row of elements in the judgment matrix; wherein M isiRepresenting the product of the elements of row i in the decision matrix, aijRepresenting the jth element in the ith row in the judgment matrix, and n representing the number of elements in each row in the judgment matrix;
a geometric mean calculation unit for using a formula according to the product of each row element
Calculating the geometric mean value of each row of elements; wherein,
representation decision matrixGeometric mean of the elements in row i;
a weight calculation unit for using the formula
Carrying out normalization calculation on the geometric mean value of each row of elements to obtain the weight of each function; wherein, ω isiRepresenting the weight of the ith function.
10. The multifunctional steady-state power regulation system of a flexible multi-state switch of claim 6, wherein the multifunctional steady-state objective function is: min F ═ ω1f1+ω2f2+ω3f3+ω4f4+ω5f5；
Wherein F is the multifunctional steady-state objective function value, F1、f2、f3、f4And f5Respectively representing parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination; omega1、ω2、ω3、ω4And ω5And the coefficients respectively represent parameter indexes of distributed power supply absorption, voltage fluctuation stabilization, power conversion supply, three-phase imbalance compensation and harmonic elimination.
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