CN110751377A - DC power distribution network topology structure design evaluation method and device - Google Patents
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Abstract
The invention provides a method and a device for evaluating the topological structure design of a direct-current power distribution network, which relate to the technical field of direct-current power distribution, and the method comprises the following steps: determining a power supply mode and a power grid load of a direct-current power distribution network, and determining a converter type and a direct-current power grid network topology based on the power supply mode and the power grid load of the direct-current power distribution network; determining the number of converters according to the network topology of the direct current power grid and the load of the power grid; determining a direct current distribution network topology based on the number of converters and the direct current power grid network topology; establishing an evaluation level model based on the direct current distribution network topology, establishing an evaluation matrix for each target layer and each index layer, wherein the evaluation level model comprises an index layer, a target layer and a scheme layer; carrying out consistency check and judgment on the evaluation matrix, and calculating a weighting coefficient; and scoring the DC distribution network topology based on the weighting coefficients. The method provided by the invention can provide evaluation basis for judging whether the direct current power distribution topology is reasonable or not.
Description
Technical Field
The invention relates to the technical field of direct current power distribution, in particular to a method and a device for evaluating the topological structure design of a direct current power distribution network.
Background
With the rapid development of renewable energy utilization and power electronic technology, more and more distributed direct-current power supplies, direct-current loads and energy storage elements are connected to a power distribution network, and the power distribution network is gradually converted from an alternating-current power distribution network to an alternating-current/direct-current hybrid power distribution network and a direct-current power distribution network. Compared with the traditional alternating current distribution network, the direct current distribution network has outstanding advantages in the aspects of technology and economy, is concerned in both production and research, and has wide application prospect in future intelligent distribution systems. Meanwhile, the rapid development of the flexible direct-current transmission technology also drives the synchronous construction of the direct-current power distribution network. An alternating current-direct current hybrid and pure direct current power distribution network is an inevitable development trend, but the direct current power distribution technology is still in a starting stage from the aspects of planning design, operation control, protection and the like, is not tested in the aspect of commercial practice, and still needs to be continuously improved. The topological structure of the direct-current power distribution network assigns the connection forms of the bus, the cable, the overhead line, the current conversion equipment, the alternating-current and direct-current circuit breaker and other element equipment in the power grid. The reliability and the stability of the power distribution system are directly influenced by different topological structures, a reasonable grid structure can provide a strong and reliable operation foundation for a power grid, the occurrence probability of major safety stories is reduced, the quick recovery power supply capacity of the system after a fault is guaranteed, and the economic loss of the power grid and users is reduced. In a direct-current power distribution network, the access of devices such as a distributed direct-current power supply, a direct-current load, an energy storage device and a direct-current breaker changes the topological structure of the power distribution network and changes the power flow control capability of the network. In addition, the existing planning and design principle, power quality and economic evaluation method of the alternating-current power distribution network is not completely applicable any more, and the mutual influence of the reliability of the direct-current device and the reliability of the power distribution network needs to be considered. Therefore, how to reasonably and orderly connect various elements of the direct current distribution network, design a topological structure, and comprehensively evaluate the topological structure is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for evaluating a topology structure design of a dc power distribution network, which provide a reasonable evaluation scheme for orderly connecting various elements of the dc power distribution network and designing the topology structure, and provide a basis for selecting a dc power distribution topology.
In a first aspect, the invention provides a method for evaluating a topology structure design of a direct current power distribution network, which specifically comprises the following steps:
s1, determining a direct current power distribution network power supply mode and a power grid load, and determining a converter type and a direct current power grid network topology based on the direct current power grid power supply mode and the power grid load;
s2: determining a number of converters based on the DC grid network topology and the grid load;
s3: determining a direct current distribution network topology based on the number of converters and the direct current grid network topology;
s4: establishing an evaluation level model based on the DC distribution network topology and establishing an evaluation matrix for each target layer and the index layer based on the established evaluation level model, wherein the evaluation level model comprises an index layer, a target layer and a scheme layer;
s5: carrying out consistency check and judgment on the evaluation matrix, and calculating a weighting coefficient;
s6: scoring the direct current distribution network topology based on the weighting coefficients.
Preferably, the step of S4: establishing an evaluation level model based on the DC distribution network topology and establishing the evaluation level model based on the DC distribution network topology, wherein the evaluation level model comprises an index layer, a target layer and a scheme layer, and the step of establishing an evaluation matrix for each target layer and the index layer comprises the following steps:
the following formula is adopted to establish an evaluation matrix
aij-weight value of ith index;
a-evaluation matrix.
Preferably, the step of S5: the step of carrying out consistency check and judgment on the evaluation matrix and calculating the weighting coefficient comprises the following steps:
the consistency ratio is calculated using the following formula:
λmax-evaluating the maximum characteristic root of the matrix;
n-the dimension of the evaluation matrix;
RI — average random consistency index;
CR-consistency ratio;
determining whether the evaluation matrix is receivable based on the agreement ratio;
when the consistency ratio CR is less than 0.1, the evaluation matrix is acceptable;
otherwise, the evaluation matrix is not acceptable;
calculating the weighting coefficient of each row element of the evaluation matrix by adopting the following formula:
k is the number of index layers.
Preferably, the step of S6: the step of scoring the dc distribution network topology based on the weighting coefficients comprises:
and calculating the weight of the element on the u layer to the target layer by adopting the following formula:
wu＝p(u)w(u-1)；‘
wherein,
In another aspect, the present invention provides a dc power distribution network topology design evaluation apparatus, including:
the power distribution and supply determination module: the method comprises the steps of determining a direct current power grid power supply mode and a power grid load, and determining a converter type and a direct current power grid network topology based on the direct current power grid power supply mode and the power grid load;
converter quantity conversion module: for determining a number of converters based on the dc grid network topology and the grid load;
a direct current power grid determination module: for determining a dc distribution network topology based on the number of converters and the dc grid network topology;
an evaluation matrix establishing module: the evaluation system comprises a direct current distribution network topology establishing module, a data processing module and a data processing module, wherein the direct current distribution network topology establishing module is used for establishing an evaluation level model based on the direct current distribution network topology and an evaluation level model based on the establishment, the evaluation level model comprises an index layer, a target layer and a scheme layer, and an evaluation matrix is established for each target layer and the index layer;
a weighting coefficient establishing module: carrying out consistency check and judgment on the evaluation matrix, and calculating a weighting coefficient;
an evaluation module: for scoring the dc distribution network topology based on the weighting coefficients.
The embodiment of the invention has the following beneficial effects: the invention provides a method and a device for evaluating the topological structure design of a direct-current power distribution network, wherein the method comprises the following steps: determining a direct-current power grid power supply mode and a power grid load, and determining a converter type and a direct-current power grid network topology based on the direct-current power grid power supply mode and the power grid load; determining the number of converters according to the network topology of the direct current power grid and the load of the power grid; determining a direct current distribution network topology based on the number of converters and the direct current power grid network topology; establishing an evaluation level model based on the direct current distribution network topology, establishing an evaluation matrix for each target layer and each index layer, wherein the evaluation level model comprises an index layer, a target layer and a scheme layer; carrying out consistency check and judgment on the evaluation matrix, and calculating a weighting coefficient; and scoring the DC distribution network topology based on the weighting coefficients. The method provided by the invention can provide evaluation basis for judging whether the direct current power distribution topology is reasonable or not.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a topology structure of a dc power distribution network according to an embodiment of the present invention;
fig. 2 is a flowchart of dc power distribution network topology design evaluation provided in the embodiment of the present invention;
fig. 3 is a hierarchical evaluation system diagram of the dc distribution network according to the embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present 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.
At present, however, the direct current power distribution technology is still in a starting stage from the aspects of planning design, operation control, protection and the like, and is not checked in the aspect of commercial practice, and still needs to be continuously perfected. Based on this, the method and the device for evaluating the topology structure design of the direct current distribution network provided by the embodiment of the invention can provide a reasonable evaluation scheme for orderly connection and topology structure design of various elements of the direct current distribution network, and provide a basis for selection of the direct current distribution topology.
In order to facilitate understanding of the embodiment, a detailed description is first given to a method for evaluating a topology structure of a dc power distribution network disclosed in the embodiment of the present invention.
The first embodiment is as follows:
with reference to fig. 1, fig. 2, and fig. 3, an embodiment of the present invention provides a method for evaluating a topology structure design of a dc power distribution network, which specifically includes the following steps:
s1, determining a direct current power distribution network power supply mode and a power grid load, and determining a converter type and a direct current power grid network topology based on the direct current power grid power supply mode and the power grid load;
the direct-current power distribution network comprises a direct-current power supply and a direct-current load, and the direct-current power supply and the direct-current load are connected through a direct-current/direct-current converter, a direct-current transformer, a direct-current breaker and a direct-current bus; otherwise, an alternating current power supply and an alternating current load in the power distribution network are connected into the direct current power distribution network through an alternating current circuit breaker, an alternating current/direct current converter, a direct current circuit breaker and a direct current bus;
s2: determining a number of converters based on the DC grid network topology and the grid load;
s3: determining a direct current distribution network topology based on the number of converters and the direct current grid network topology;
specifically, according to the number of power supplies of a power distribution network, power supply flexibility, reliability requirements, manufacturing cost and control protection requirements, one of three main network power supply modes, namely a single-ended radial network, a double-ended hand-in-hand network and a ring network, is selected as a basic network power supply mode;
in terms of power supply, the number of converters needs to be determined, and the determination criteria are as follows: the number N of the converters is assumed, and when the N-1 converters are connected to the direct-current power distribution network, the requirements of the rated capacity and the load power of the network can be met, so that the power distribution network can still keep stable operation and normal power supply and can meet the requirement of safe power transmission.
Further, the power distribution network topology is determined based on the power supply mode and the converter selection criterion
S4: establishing an evaluation level model based on the DC distribution network topology and establishing an evaluation matrix for each target layer and the index layer based on the established evaluation level model, wherein the evaluation level model comprises an index layer, a target layer and a scheme layer;
it should be noted that, in the embodiment provided by the present invention, there are two index layers, and the membership element below the first index layer: reliability, economy and adaptability, and the following indicators of reliability include: network load rate (A1-1), DC power quality (A1-2) and element reliability ((A1) -3); economic indicators include: annual cost (A2-1) and investment (A2-2); the following adaptive indicators include: distributed load access (A3-1) and load development (A3-2);
specifically, the following formula is adopted to establish an evaluation matrix
aij-weight value of ith index;
a-evaluation matrix.
In the embodiment provided by the invention, an evaluation matrix is established for the first index layer; a
S5: carrying out consistency check and judgment on the evaluation matrix, and calculating a weighting coefficient;
specifically, the consistency ratio is calculated using the following formula:
λmax-evaluating the maximum characteristic root of the matrix;
n-the dimension of the evaluation matrix;
RI — average random consistency index;
CR-consistency ratio;
specifically, the average random uniformity index
Determining whether the evaluation matrix is receivable based on the agreement ratio;
when the consistency ratio CR is less than 0.1, the evaluation matrix is acceptable;
otherwise, the evaluation matrix is not acceptable;
calculating the weighting coefficient of each row element of the evaluation matrix by adopting the following formula:
k is the number of index layers.
It should be noted that, in the embodiment provided by the present invention, the weighting coefficient is obtained from the evaluation matrix established in the first index layer, and table 1 is obtained:
| A | A1 | A2 | A3 | W |
| A1 | 1 | 2 | 2 | 0.5 |
| A2 | 1/2 | 1 | 1 | 0.25 |
| A3 | 1/2 | 1 | 1 | 0.25 |
TABLE 1 weighting factor Table
S6: scoring the direct current distribution network topology based on the weighting coefficients.
Preferably, the step of S6: the step of scoring the dc distribution network topology based on the weighting coefficients comprises:
and calculating the weight of the element on the u layer to the target layer by adopting the following formula:
wu＝p(u)w(u-1)；‘
wherein,
-weight of the ith element on the u-1 layer to the target layer.
On the other hand, the invention provides a device for evaluating the topological structure design of a direct-current power distribution network, which comprises the following components:
the power distribution and supply determination module: the method comprises the steps of determining a direct current power grid power supply mode and a power grid load, and determining a converter type and a direct current power grid network topology based on the direct current power grid power supply mode and the power grid load;
converter quantity conversion module: determining the number of converters based on the network topology of the direct current distribution network and the load of the power grid;
a direct current power grid determination module: for determining a dc distribution network topology based on the number of converters and the dc grid network topology;
an evaluation matrix establishing module: the evaluation system comprises a direct current distribution network topology establishing module, a data processing module and a data processing module, wherein the direct current distribution network topology establishing module is used for establishing an evaluation level model based on the direct current distribution network topology and an evaluation level model based on the establishment, the evaluation level model comprises an index layer, a target layer and a scheme layer, and an evaluation matrix is established for each target layer and the index layer;
a weighting coefficient establishing module: carrying out consistency check and judgment on the evaluation matrix, and calculating a weighting coefficient;
an evaluation module: for scoring the dc distribution network topology based on the weighting coefficients.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A design evaluation method for a topological structure of a direct current distribution network is characterized by comprising the following steps:
s1, determining a direct current power grid power supply mode and a power grid load, and determining a converter type and a direct current power grid network topology based on the direct current power grid power supply mode and the power grid load;
s2: determining a number of converters based on the DC grid network topology and the grid load;
s3: determining a direct current distribution network topology based on the number of converters and the direct current grid network topology;
s4: establishing an evaluation level model based on the DC distribution network topology and establishing an evaluation matrix for each target layer and the index layer based on the established evaluation level model, wherein the evaluation level model comprises an index layer, a target layer and a scheme layer;
s5: carrying out consistency check and judgment on the evaluation matrix, and calculating a weighting coefficient;
s6: and scoring the DC distribution network topology based on the weighting coefficients.
2. The method according to claim 1, wherein the step of S4: establishing an evaluation level model based on the DC distribution network topology and establishing the evaluation level model based on the DC distribution network topology, wherein the evaluation level model comprises an index layer, a target layer and a scheme layer, and the step of establishing an evaluation matrix for each target layer and the index layer comprises the following steps:
the following formula is adopted to establish an evaluation matrix
aij-weight value of ith index;
a-evaluation matrix.
3. The method according to claim 2, wherein the step of S5: the step of carrying out consistency check and judgment on the evaluation matrix and calculating the weighting coefficient comprises the following steps:
the consistency ratio is calculated using the following formula:
λmax-evaluating the maximum characteristic root of the matrix;
n-the dimension of the evaluation matrix;
RI — average random consistency index;
CR-consistency ratio;
determining whether the evaluation matrix is receivable based on the agreement ratio;
when the consistency ratio CR is less than 0.1, the evaluation matrix is acceptable;
otherwise, the evaluation matrix is not acceptable;
calculating the weighting coefficient of each row element of the evaluation matrix by adopting the following formula:
k is the number of index layers.
4. The method according to claim 1, wherein the step of S6: the step of scoring the dc distribution network topology based on the weighting coefficients comprises:
the weight to the target layer is calculated using the following formula:
wu＝p(u)w(u-1)；‘
wherein,
5. A DC distribution network topological structure design evaluation device is characterized by comprising:
the power distribution and supply determination module: the method comprises the steps of determining a direct current power distribution network power supply mode and a power grid load, and determining a converter type and a direct current power grid network topology based on the direct current power grid power supply mode and the power grid load;
converter quantity conversion module: for determining a number of converters based on the dc grid network topology and the grid load;
a direct current power grid determination module: for determining a dc distribution network topology based on the number of converters and the dc grid network topology;
an evaluation matrix establishing module: the evaluation system comprises a direct current distribution network topology establishing module, a data processing module and a data processing module, wherein the direct current distribution network topology establishing module is used for establishing an evaluation level model based on the direct current distribution network topology and an evaluation level model based on the establishment, the evaluation level model comprises an index layer, a target layer and a scheme layer, and an evaluation matrix is established for each target layer and the index layer;
a weighting coefficient establishing module: carrying out consistency check and judgment on the evaluation matrix, and calculating a weighting coefficient;
an evaluation module: for scoring the dc distribution network topology based on the weighting coefficients.
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