CN110061506B - Circuit breaker opening and closing simulation method based on direct algorithm - Google Patents
Circuit breaker opening and closing simulation method based on direct algorithm Download PDFInfo
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- CN110061506B CN110061506B CN201910328361.1A CN201910328361A CN110061506B CN 110061506 B CN110061506 B CN 110061506B CN 201910328361 A CN201910328361 A CN 201910328361A CN 110061506 B CN110061506 B CN 110061506B
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention discloses a circuit breaker opening and closing simulation method based on a direct algorithm, and belongs to the technical field of electric power. The algorithm includes determining a circuit breaker in the circuit network; the circuit breaker is equivalent to a resistor and a power supply which are connected in series, and a circuit breaker algorithm model is constructed; obtaining a third-order matrix type; obtained by iteration
Said third order matrix being close to zero. The circuit breaker opening and closing simulation method based on the direct algorithm is substituted into the power system load flow calculation based on the direct algorithm, the operation state of each component can be directly and sequentially calculated from the starting point under the condition that the opening and closing state of the circuit breaker is not considered, the problem that the circuit network to which the components at the head end and the tail end of the circuit breaker belong is required to be considered in the conventional load flow calculation when the circuit breaker is opened is solved, the calculation complexity is greatly reduced, the calculation speed is improved, the calculation time is shortened, the circuit breaker opening and closing simulation method based on the direct algorithm can be used for various power networks, and the method has very high practicability.
Description
Technical Field
The invention belongs to the technical field of electric power, and particularly relates to a circuit breaker opening and closing simulation method based on a direct algorithm.
Background
The electric power system is an electric energy production and consumption system consisting of power plants, transmission and transformation lines, power supply and distribution stations, power consumption and other links. The function of the device is to convert the primary energy of the nature into electric energy through a power generation device, and then supply the electric energy to each user through power transmission, power transformation and power distribution. In order to realize the function, the power system is also provided with corresponding information and control systems at each link and different levels, and the production process of the electric energy is measured, regulated, controlled, protected, communicated and scheduled so as to ensure that users obtain safe and high-quality electric energy.
Three calculations are mainly involved in power systems, among which a power flow calculation is a basic electrical calculation for studying the steady-state operation of a power system, and the task of a conventional power flow calculation is to determine the operation state of the whole system, such as the voltage (amplitude and phase angle) on each bus, the power distribution in the network, and the power loss, etc., on the basis of given operating conditions and network structure. The result of the power flow calculation is the basis of the power system stability calculation and fault analysis.
In the existing power flow calculation, such as a straight-chain and branched-chain three-phase symmetric multi-power non-ring network power system direct algorithm provided by the invention patent of CN103956741B and a direct calculation method based on a ring network power system provided by the invention patent of CN106451456B, the calculation of the operation state of a circuit network with circuit breaker nodes is too complex, because the circuit breaker has two working states of closing and opening, in the closing state of the circuit breaker, the circuit breaker needs to be judged in which circuit network, then the related calculation of the operation state is carried out, and after the circuit breaker is opened, the circuit network needs to be re-networked, at the moment, the head end and the tail end of the circuit breaker need to be judged in which circuit network respectively, and then the related calculation of the operation state is carried out. Therefore, a method capable of rapidly calculating an operation state of a circuit network in which a breaker node exists is urgently needed.
Disclosure of Invention
In order to solve one or more technical problems in the prior art, the invention provides a circuit breaker opening and closing simulation method based on a straight algorithm.
In order to achieve the purpose, the invention adopts the following technical scheme:
a circuit breaker opening and closing simulation method based on a straight algorithm comprises the following steps:
(1) An algorithm model is constructed:
the method comprises the steps of enabling a circuit breaker to be equivalent to a resistor and a power supply which are connected in series, and constructing a circuit breaker algorithm model; in the circuit breaker algorithm model
Wherein the content of the first and second substances,
is the starting voltage of the circuit breaker;
is the terminal voltage of the circuit breaker; r is the resistance value of the resistor,
is the voltage of the power supply;
calculating a current for the circuit breaker;
the circuit breaker matrix is
(2) Simulation calculation
Step (2-1): substituting the circuit breaker algorithm model into a preset power flow algorithm, initializing parameters, and setting an upper limit M of iteration times of the circuit breaker algorithm model and a maximum value I of a circuit breaker opening current fm ；
Step (2-2): setting the current frame state of the breaker;
step (2-3): judging whether the breaker is in a closing state, if so, executing the step (2-4), and if not, executing the step (2-5);
step (2-4): the circuit breaker matrix is arranged as an identity matrix
Performing the step (2-6);
step (2-5): the current is calculated before the circuit breaker is placed
Setting the initial value of the power supply voltage of the circuit breaker
Setting the initial value R of the circuit breaker resistance i =1000; iteration counter n i =0; the initial value of the breaker matrix is then
Step (2-6): substituting the breaker matrix into the preset power flow algorithm, and calculating to obtain power flow data and operation data of the breaker
Step (2-7): judging whether the breaker is in a closing state, if so, executing the step (2-12), and if not, executing the step (2-8);
step (2-8): determining the calculated current of the circuit breaker
Whether or not less than I fm If yes, executing the step (2-12), otherwise, executing the step (2-9);
step (2-9): let the iteration counter n i+1 ＝n i +1；
Step (2-10): judging the iteration counter n i+1 If the number of iterations is larger than the upper limit M, executing the step (2-12) if the number of iterations is larger than the upper limit M, and otherwise executing the step (2-11);
step (2-11): determining the calculated current of the circuit breaker
If it is increased, R is i+1 ＝1.2*R i If not, R i+1 ＝0.8*R i (ii) a The breaker supply voltage is the voltage difference across the breaker, i.e.
The circuit breaker calculates the current for the previous time
If R is>10000, then R =10000, if R<10, then R =10, obtaining a new breaker matrix
Performing the step (2-6);
step (2-12): let iteration counter n i =0, calculating a frame load flow based on the preset load flow algorithm; and step (2-2) is performed.
Preferably, the upper limit M of the number of iterations is 6.
Preferably, the maximum value I of the opening current of the circuit breaker fm ＝1uA。
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects or advantages:
the circuit breaker opening and closing simulation method based on the straight algorithm is substituted into the preset load flow calculation, the operation state of each component can be directly and sequentially calculated from the starting point under the condition that the opening and closing state of the circuit breaker is not considered, the problem that the circuit network to which the components at the head end and the tail end of the circuit breaker belong is required to be considered in the conventional load flow calculation when the circuit breaker is opened is solved, the calculation complexity is greatly reduced, the calculation speed is improved, the calculation time is shortened, and the method can be used for various power networks and has very high practicability.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
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 these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a circuit breaker in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, cannot be understood as limiting the present invention.
In the description of the embodiments of the present invention, it should be further noted that the terms "disposed" and "connected," unless otherwise explicitly specified or limited, are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. For those skilled in the art, the drawings of the embodiments with specific meanings of the terms in the present invention can be understood in specific situations, and the technical solutions in the embodiments of the present invention are clearly and completely described. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The embodiment of the invention provides a circuit breaker opening and closing simulation method based on a direct algorithm, which comprises the following steps of:
(1) An algorithm model is constructed:
the circuit breaker is equivalent to a resistor and a power supply which are connected in series, and as shown in figure 1, a circuit breaker algorithm model is constructed; in the circuit breaker algorithm model
Wherein the content of the first and second substances,
is the starting voltage of the circuit breaker;
is the terminal voltage of the circuit breaker; r is the resistance value of the resistor,
is the voltage of the power supply;
is the current flowing through the circuit breaker;
the circuit breaker matrix is
(2) Simulation calculation
Step (2-1): substituting the circuit breaker algorithm model into a preset power flow algorithm, initializing parameters, and setting an upper limit M of iteration times of the circuit breaker algorithm model and a maximum value I of a circuit breaker opening current fm ；
Step (2-2): setting the current frame state of the breaker;
step (2-3): judging whether the breaker is in a closing state, if so, executing the step (2-4), and if not, executing the step (2-5);
step (2-4): the circuit breaker matrix is arranged as an identity matrix
Performing the step (2-6);
step (2-5): the current is calculated before the circuit breaker is placed
Setting the initial value of the power supply voltage of the circuit breaker
Setting the initial value R of the circuit breaker resistance i =1000; iteration counter n i =0; the initial value of the breaker matrix is then
Step (2-6): substituting the breaker matrix into the preset power flow algorithm, and calculating to obtain power flow data and operation data of the breaker
Step (2-7): judging whether the breaker is in a closing state, if so, executing the step (2-12), and if not, executing the step (2-8);
step (2-8): determining the calculated current of the circuit breaker
Whether or not less than I fm If yes, executing the step (2-12), otherwise, executing the step (2-9);
step (2-9): let the iteration counter n i+1 ＝n i +1；
Step (2-10): judging the iteration counter n i+1 If the number of iterations is larger than the upper limit M, executing the step (2-12) if the number of iterations is larger than the upper limit M, and otherwise executing the step (2-11);
step (2-11): determining the calculated current of the circuit breaker
If it is increased, then R i+1 ＝1.2*R i If not, R i+1 ＝0.8*R i (ii) a The breaker supply voltage is the voltage difference across the breaker, i.e.
The circuit breaker calculates the current for the previous time
If R is>10000, then R =10000, if R<10, then R =10, and obtaining a new breaker matrix
Performing the step (2-6);
step (2-12): let iteration counter n i =0, calculating a frame load flow based on the preset load flow algorithm; and step (2-2) is performed.
The circuit breaker opening and closing simulation method based on the straight algorithm is substituted into the preset power flow algorithm, the operation state of each component can be directly and sequentially calculated from the starting point under the condition that the opening and closing state of the circuit breaker is not considered, the problem that the circuit network to which the components at the head end and the tail end of the circuit breaker belong is required to be considered in the conventional power flow calculation when the circuit breaker is opened is solved, the calculation complexity is greatly reduced, the calculation speed is improved, the calculation time is shortened, and the method can be used for various power networks and has very high practicability.
It should be noted that the circuit breaker switching-on and switching-off simulation method based on the straight-chain algorithm provided by the present invention is applicable to any circuit breaker, wherein the preset power flow algorithm is an existing conventional power flow calculation method in the power system, such as the straight-chain and branched-chain three-phase symmetric multi-power-supply non-ring network power system straight-chain algorithm and the straight-chain calculation method based on the ring network power system mentioned in the background art, and the present invention is not limited herein.
In a specific implementation process, the more the iteration times in the circuit breaker opening and closing simulation method based on the straight algorithm are, the maximum value I of the circuit breaker opening current is fm The smaller the size, the more accurate the final calculation. In the embodiment of the present invention, the upper limit M of the number of iterations is preferably 6, and the maximum value I of the breaker opening current fm Preferably 1uA. Generally, the upper limit M of the iteration times is set to be 6, and the maximum value I of the opening current of the circuit breaker fm The required calculation precision can be achieved by setting the value to be 1uA, and if the required calculation precision is not enough, the required calculation precision can be adjusted according to the requirement.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (3)
1. A circuit breaker opening and closing simulation method based on a straight algorithm is characterized by comprising the following steps:
(1) An algorithm model is constructed:
the method comprises the steps of enabling a circuit breaker to be equivalent to a resistor and a power supply which are connected in series, and constructing a circuit breaker algorithm model; in the circuit breaker algorithm model
Wherein, the first and the second end of the pipe are connected with each other,
is the starting voltage of the circuit breaker;
is the terminal voltage of the circuit breaker; r is the resistance value of the resistor,
is the voltage of the power supply;
calculating a current for the circuit breaker;
the circuit breaker matrix is
(2) Simulation calculation
Step (2-1): substituting the circuit breaker algorithm model into a preset power flow algorithm, initializing parameters, and setting an upper limit M of iteration times of the circuit breaker algorithm model and a maximum value I of a circuit breaker opening current fm ；
Step (2-2): setting the current frame state of the breaker;
step (2-3): judging whether the breaker is in a closing state, if so, executing the step (2-4), and if not, executing the step (2-5);
step (2-4): the circuit breaker matrix is an identity matrix
Performing the step (2-6);
step (2-5): the current is calculated before the circuit breaker is placed
Setting the initial value of the power supply voltage of the circuit breaker
Setting the initial value R of the circuit breaker resistance i =1000; iteration counter n i =0; the initial value of the breaker matrix is then
Step (2-6): substituting the breaker matrix into the preset power flow algorithm, and calculating to obtain power flow data and operation data of the breaker
Step (2-7): judging whether the breaker is in a closing state, if so, executing the step (2-12), and if not, executing the step (2-8);
step (2-8): determining the calculated current of the circuit breaker
Whether or not less than I fm If yes, executing the step (2-12), otherwise, executing the step (2-9);
step (2-9): let the iteration counter n i+1 ＝n i +1；
Step (2-10): judging the iteration counter n i+1 If the number of iterations is larger than the upper limit M of the number of iterations, if so, executing the step (2-12), otherwise, executing the stepPerforming the step (2-11);
step (2-11): determining the calculated current of the circuit breaker
If it is increased, R is i+1 ＝1.2*R i If not, R i+1 ＝0.8*R i (ii) a The breaker supply voltage is the voltage difference across the breaker, i.e.
The previous current calculation of the circuit breaker
If R is>10000, then R =10000, if R<10, then R =10, and obtaining a new breaker matrix
Performing the step (2-6);
step (2-12): let iteration counter n i =0, calculating a frame load flow based on the preset load flow algorithm; and step (2-2) is performed.
2. The circuit breaker opening and closing simulation method based on the straight algorithm according to claim 1, wherein the upper limit M of the number of iterations is 6.
3. The circuit breaker opening and closing simulation method based on the direct algorithm according to claim 1, wherein the maximum value I of the circuit breaker opening current fm ＝1uA。
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