CN113592126B - Coordination evaluation method and system based on grid structure of high-voltage and medium-voltage power distribution network - Google Patents
Coordination evaluation method and system based on grid structure of high-voltage and medium-voltage power distribution network Download PDFInfo
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Abstract
The invention discloses a coordination evaluation method and a coordination evaluation system based on a grid structure of a high-voltage and medium-voltage distribution network, wherein the coordination evaluation method and the coordination evaluation system respectively analyze the power supply safety level of the high-voltage and medium-voltage grid structure under the condition of N-1 and N-1-1 outage of corresponding groups of load levels from a high-voltage layer and a medium-voltage layer by utilizing the power supply safety standard of an urban power grid; calculating the reliability index of the high and medium voltage distribution network and the comprehensive annual cost of the high and medium voltage grid structure by utilizing a coordination calculation strategy; and evaluating various high and medium voltage distribution network grid structure combination schemes by using the power supply safety level, the reliability index and the comprehensive cost, and judging the superiority of the various combination schemes. The method can realize coordination optimization of the grid structure of the high-medium voltage distribution network, improve the power supply quality and reduce the investment of capital cost, thereby realizing the overall optimality of planning and transformation of the high-medium voltage distribution network.
Description
Technical Field
The invention relates to the technical field of planning of high and medium voltage distribution networks, in particular to a coordination evaluation method and system based on grid structures of high and medium voltage distribution networks.
Background
The power distribution network planning aims at guiding the construction and transformation of the power distribution network, solving the current situation problem of the power distribution network, meeting the requirements of customers, reducing operation and maintenance work, improving customer satisfaction, and directly and indirectly connecting the power distribution network planning with third party customer satisfaction, average annual power failure time of customers, automatic coverage rate, rotatable power supply rate, line heavy overload rate, occurrence probability of power safety event, typical wiring rate, project feasibility, equipment line invalidity, line loss abnormal average and the like.
The traditional power distribution network planning is to separately plan a high-voltage power distribution network and a medium-voltage power distribution network, which may cause incompatibility between the lower level and the lower level of the power distribution network; and the so-called high-reliability power distribution network planning multi-tendency adopts a high-medium voltage power distribution network matching mode of 'strong-strong', so that the power supply reliability and the economy are difficult to be considered. The technical guideline (DLT 5729-2016) for planning and designing the power distribution network clearly indicates that three levels of the high-voltage, medium-voltage and low-voltage power distribution networks are matched with each other, are strong, simple and orderly and mutually supported so as to realize the overall optimization of the technical economy of the power distribution network.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above-described problems occurring in the prior art.
Therefore, the invention provides a coordination evaluation method based on the grid structure of the high-voltage and medium-voltage distribution network, which can improve the power supply quality and reduce the investment of capital cost.
In order to solve the technical problems, the invention provides the following technical scheme: analyzing the power supply safety level of a high-medium voltage grid structure in a corresponding group of load levels N-1 and N-1-1 outage scene from a high-voltage layer and a medium-voltage layer by utilizing the power supply safety standard of an urban power grid; calculating the reliability index of the high and medium voltage distribution network and the comprehensive annual cost of the high and medium voltage grid structure by utilizing a coordination calculation strategy; and evaluating various high and medium voltage distribution network grid structure combination schemes by using the power supply safety level, the reliability index and the comprehensive cost, and judging the superiority of the various combination schemes.
As a preferable scheme of the coordination evaluation method based on the grid structure of the high-voltage and medium-voltage distribution network, the invention comprises the following steps: the evaluation analysis specifically comprises the step of selecting the high-medium voltage distribution network rack combination scheme with higher power supply safety level and meeting the principle of lower comprehensive annual cost as an optimal recommendation scheme on the basis of meeting the corresponding power supply safety level requirements.
As a preferable scheme of the coordination evaluation method based on the grid structure of the high-voltage and medium-voltage distribution network, the invention comprises the following steps: calculating the reliability index comprises calculating the average power outage time of a low-voltage bus of the high-voltage transformer substation by using a 4N+2M parameter equivalent power supply coordination calculation strategy; taking the average power failure time as a reliability parameter of an equivalent power supply of an upper power grid of a medium-voltage feeder; and calculating the reliability index of the medium-voltage distribution network influenced by the high-voltage power network again by utilizing the reliability parameter and combining the power distribution network reliability evaluation forward fault diffusion strategy based on capacity and voltage constraint, and defining the reliability index as the average power failure time of the medium-voltage distribution network.
As a preferable scheme of the coordination evaluation method based on the grid structure of the high-voltage and medium-voltage distribution network, the invention comprises the following steps: the method comprises the steps of respectively calculating the annual cost of the high-voltage distribution network and the annual cost of the medium-voltage distribution network; converting the average power outage time of the medium-voltage distribution network into annual cost of high-medium-voltage power outage loss; and integrating the Gao Zhongya annual cost of power failure loss with the annual cost of the high and medium voltage distribution network to obtain the comprehensive annual cost of the high and medium voltage grid structure.
As a preferable scheme of the coordination evaluation method based on the grid structure of the high-voltage and medium-voltage distribution network, the invention comprises the following steps: calculating the annual cost of the high-voltage distribution network, wherein the annual cost of the high-voltage transformer substation, the annual cost of high-voltage line investment, the annual cost of high-voltage switch investment and the annual cost of high-voltage line electric energy loss; calculating the annual cost of the medium-voltage distribution network comprises the annual cost of investment of a medium-voltage line, the annual cost of electric energy loss of the medium-voltage line and the feeder automation cost.
As a preferable scheme of the coordination evaluation method based on the grid structure of the high-voltage and medium-voltage distribution network, the invention comprises the following steps: calculating the annual cost of investment for the high voltage line includes,
C hvxt ＝εL hv C hv
ε＝k y +k h
wherein L is hv : length of high voltage line, C hv : comprehensive manufacturing cost, k of single-unit length of high-voltage line y And k h The operation maintenance cost coefficient and the investment recovery coefficient containing depreciation are respectively;
the high voltage switch invests annual cost,
C kt ＝εN k C k
wherein N is k : total number of switches C k : a single switch price;
the annual cost of the electric energy loss of the high-voltage line,
C xs- h v ＝C e-hv ΔP max-hv τ max-hv
wherein DeltaP max-hv : maximum power loss of line τ max-hv : hours of maximum load loss, C e-hv :110kV electricity purchasing price;
calculating the annual cost of investment of the medium-voltage circuit,
C mvxt ＝ε×k q ×R mv ×N s ×n t ×n l ×c mvl
wherein K is q : taking the bending coefficient of the medium-voltage line of the branch line into consideration, R mv : power supply radius of medium voltage line, N s : number of 110kV transformer substations, n t : main leveling average number, n, of 110kV transformer substation l : average outgoing line number of single main transformer, c mvl : the comprehensive cost of the unit length of the medium-voltage circuit;
the medium voltage switch invests annual cost,
C hv-kt ＝ε hv N hv-k C hv-k
wherein N is hv-k : total number of switches, epsilon hv : the sum of the running maintenance cost coefficient and the investment recovery coefficient containing depreciation of the medium-voltage distribution network, C hv-k : price of single medium voltage switch;
the annual cost of the electric energy loss of the medium-voltage circuit,
C xs-mv ＝C e-mv ΔP max-mv τ max-m
wherein DeltaP max- : maximum power loss of line τ max : hours of maximum load loss, C e-mv :10kV electricity purchasing price; and the feeder line automation cost is calculated by utilizing a medium-voltage distribution network grid structure.
As a preferable scheme of the coordination evaluation method based on the grid structure of the high-voltage and medium-voltage distribution network, the invention comprises the following steps: comprises the following steps of calculating the loss cost of the adult power outage by using the average power outage time of a medium-voltage power distribution network user,
C ks ＝C E P max ξSAIDI
wherein C is E : the power failure cost of the unit electric quantity is generally estimated according to the power generation ratio method, and the calculation is simple and the data is easy to obtain; p (P) max And ζ is the maximum load value and the load factor (i.e., the ratio of the average load to the maximum load), respectively; SAIDI: user's year roundPower outage duration.
As a preferable scheme of the coordination evaluation method based on the grid structure of the high-voltage and medium-voltage distribution network, the invention comprises the following steps: the comprehensive cost calculation comprises the annual cost of the high and medium voltage distribution network and the annual power failure loss cost of the high and medium voltage distribution network, and is as follows
C HML,k ＝C HV,k +C MV,k +C HMT,k
C HML,k : grid total cost of kth coordination scheme, C HV,k 、C MV,k And C HMT,k The annual cost of the high-voltage distribution network, the annual cost of the medium-voltage distribution network and the annual power failure loss cost of the high-voltage and medium-voltage distribution network of the kth coordination scheme are respectively calculated.
As a preferable scheme of the coordination evaluation method based on the grid structure of the high-voltage and medium-voltage distribution network, the invention comprises the following steps: the high-voltage layer comprises a high-voltage line, a high-voltage line channel, a transformer substation and a main transformer; the medium voltage layer comprises a medium voltage circuit and a medium voltage circuit channel.
As a preferable scheme of the coordination evaluation system based on the grid structure of the high-voltage and medium-voltage power distribution network, the coordination evaluation system based on the grid structure of the high-voltage and medium-voltage power distribution network comprises the following components: the system comprises a data processing center module, a data processing unit and a data processing unit, wherein the data processing center module is used for processing various fees and the reliability index and comprises a calculating unit and a storage unit, the calculating unit is used for calculating annual fees of the high and medium voltage distribution network and annual power failure loss fees of the high and medium voltage distribution network, and the storage unit is used for storing calculation results and analysis results; the analysis module is connected with the data processing center module and is used for receiving the calculation result of the calculation unit, comparing various grid structure combination schemes of the high-medium voltage distribution network, analyzing the power supply safety level, judging and selecting the optimal combination scheme for recommendation; the output management module is connected with the calculation unit and the analysis module and is used for transmitting the calculation result and the information flow and outputting the analysis result of the analysis module.
The invention has the beneficial effects that: the method can realize coordination optimization of the grid structure of the high-medium voltage distribution network, improve the power supply quality and reduce the investment of capital cost, thereby realizing the overall optimality of planning and transformation of the high-medium voltage distribution network.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a flow chart of a coordination evaluation method based on grid structures of high and medium voltage distribution networks according to a first embodiment of the present invention;
fig. 2 is a schematic diagram showing a comparison of test output of a first combination scheme of a coordination evaluation method based on grid structures of high and medium voltage distribution networks according to a first embodiment of the present invention;
fig. 3 is a schematic diagram showing comparison of test output of a second combination scheme of a coordination evaluation method based on grid structures of high and medium voltage distribution networks according to a first embodiment of the present invention;
fig. 4 is a schematic block diagram of a coordination evaluation system based on grid structures of high and medium voltage distribution networks according to a second embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present invention have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
The traditional power distribution network planning is to separately plan a high-voltage power distribution network and a medium-voltage power distribution network, so that incompatibility between the upper and lower levels of the power distribution network is caused, and the high-reliability power distribution network planning tends to adopt a strong-strong high-medium-voltage power distribution network matching mode, so that the power supply reliability and the economy are difficult to be considered.
Referring to fig. 1, fig. 2 and fig. 3, a first embodiment of the present invention provides a coordination evaluation method based on a grid structure of a high-voltage and medium-voltage power distribution network, which includes:
s1: and analyzing the power supply safety levels of the high-medium voltage grid structure under N-1 and N-1-1 outage scenes under the corresponding group load levels from the high-voltage layer and the medium-voltage layer respectively by utilizing the power supply safety standard of the urban power grid. The following are to be described:
the high-voltage layer comprises a high-voltage line, a high-voltage line channel, a transformer substation and a main transformer thereof;
the medium voltage layer comprises a medium voltage circuit and a medium voltage circuit channel.
S2: and calculating the reliability index of the high and medium voltage distribution network and the comprehensive annual cost of the high and medium voltage grid structure by utilizing a coordination calculation strategy. The step is to be noted that the calculation of the reliability index includes:
calculating the average power outage time of a low-voltage bus of the high-voltage transformer substation by using a 4N+2M parameter equivalent power supply coordination calculation strategy;
taking the average power failure time of a house as a reliability parameter of an equivalent power supply of an upper power grid of a medium voltage feeder;
and calculating the reliability index of the medium-voltage distribution network influenced by the high-voltage power network again by utilizing the reliability parameter and combining the reliability evaluation forward fault diffusion strategy of the distribution network based on capacity and voltage constraint, and defining the reliability index as the average power failure time of the medium-voltage distribution network.
The calculation of the comprehensive annual cost of the high and medium voltage grid structure comprises the following steps:
calculating the annual cost of the high-voltage distribution network and the annual cost of the medium-voltage distribution network respectively;
converting average power outage time of a medium-voltage distribution network into annual cost of high-medium-voltage power outage loss;
and integrating the annual cost of high and medium voltage power failure loss with the annual cost of a high and medium voltage power distribution network to obtain the comprehensive annual cost of the high and medium voltage grid structure.
Further, calculating annual cost of the high voltage distribution network includes:
annual cost of high-voltage transformer substation, annual cost of high-voltage line investment, annual cost of high-voltage switch investment and annual cost of high-voltage line electric energy loss.
Calculating annual cost of the medium voltage distribution network comprises the following steps:
annual investment cost of medium voltage lines, annual electric energy consumption cost of medium voltage lines and feeder automation cost.
Specifically, calculating the annual cost of investment of the high-voltage line comprises:
C hvxt ＝εL hv C hv
ε＝k y +k h
wherein L is hv : length of high voltage line, C hv : comprehensive manufacturing cost, k of single-unit length of high-voltage line y And k h The operation maintenance cost coefficient and the investment recovery coefficient containing depreciation are respectively;
the investment annual cost of the high-voltage switch,
C kt ＝εN k C k
wherein N is k : total number of switches C k : a single switch price;
the annual cost of the electric energy loss of the high-voltage line,
C xs-hv ＝C e-hv ΔP max-hv τ max-hv
wherein DeltaP max-hv : maximum power loss of line τ max-hv : hours of maximum load loss, C e-hv :110kV electricity purchasing price;
calculating the investment annual cost of the medium-voltage circuit,
C mvxt ＝ε×k q ×R mv ×N s ×n t ×n l ×c mvl
wherein K is q : taking the bending coefficient of the medium-voltage line of the branch line into consideration, R mv : power supply radius of medium voltage line, N s : number of 110kV transformer substations, n t : main leveling average number, n, of 110kV transformer substation l : average outgoing line number of single main transformer, c mvl : the comprehensive cost of the unit length of the medium-voltage circuit;
the investment annual cost of the medium-voltage switch,
C hv-kt ＝ε hv N hv-k C hv-k
wherein N is hv-k : total number of switches, epsilon hv : the sum of the running maintenance cost coefficient and the investment recovery coefficient containing depreciation of the medium-voltage distribution network, C hv-k : price of single medium voltage switch;
the annual cost of the electric energy loss of the medium-voltage circuit,
C xs-mv ＝C e-mv ΔP max-mv τ max
wherein DeltaP max- : maximum power loss of line τ max-mv : hours of maximum load loss, C e-mv : electricity purchase price of 10 kV.
The feeder automation cost is calculated by utilizing a medium voltage distribution network grid structure, and the feeder automation cost comprises the following steps:
a single medium voltage line ("hand-in-hand" connection) employs the feeder automation costs in a centralized feeder automation (full two-tele, "telemetry" and telemetry ") mode,
C hv-pz2 ＝[(N fd -1)+0.5]×C FTU +C tx
wherein N is fd : line segment number, C FTU : price of single FTU 'two-remote' switch, C tx : investment in communication network construction;
the single medium voltage line (hand-in-hand) adopts the feeder automation cost under the centralized feeder automation (all three remote control, remote measurement, remote signaling and remote control) mode,
C hv-pz3 ＝[(N fd -1)+0.5]×C zn +L hv-pz ×C GL
wherein N is fd : line segment number, C zn : price of single intelligent switch, L hv-pz : optical cable construction length, C GL : the investment in the construction of the optical cable in unit length.
The average power outage time of medium-voltage distribution network users is utilized to calculate the loss cost of adult power outage,
C ks ＝C E P max ξSAIDI
wherein C is E : the power failure cost of the unit electric quantity is generally estimated according to the power generation ratio method, and the calculation is simple and the data is easy to obtain; p (P) max And ζ is the maximum load value and the load factor (i.e., the ratio of the average load to the maximum load), respectively; SAIDI: average power outage duration for users year;
the comprehensive cost calculation comprises the annual cost of the high and medium voltage distribution network and the annual power failure loss cost of the high and medium voltage distribution network, and is as follows
C HML,k ＝C HV,k +C MV,k +C HMT,k
C HML,k : grid total cost of kth coordination scheme, C HV,k 、C MV,k And C HMT,k The annual cost of the high-voltage distribution network, the annual cost of the medium-voltage distribution network and the annual power failure loss cost of the high-voltage and medium-voltage distribution network of the kth coordination scheme are respectively calculated.
It should be noted that, calculating the comprehensive cost of the network frame of the high-medium voltage distribution network with the minimum total cost during planning as the goal includes:
wherein f HML : high and medium voltage distribution network 'strong, simple and weak' coordinated combination scheme total cost S HMZW : the number set of the candidate coordination schemes selects a candidate coordination scheme with reasonable technical economy according to the actual conditions such as the planned regional load density, the development trend, the technical equipment level and the like, C HML,k : grid total cost of kth coordination scheme, C HMX,k 、C HMT,k And C HMY,k High-medium voltage circuit investment cost, power failure loss cost and operation cost respectively of kth coordination scheme, L MZG,k,i And L MBG,k,i The minimum line length between the ith medium voltage load point (such as distribution transformer or block load) and the main supply transformer substation and the standby supply transformer substation in the kth coordination scheme is L HZG,k,j And L HLL,k,j For the line length and the line length of the j-th high-voltage substation from the power supply substation under the condition of the k-th coordination schemeThe length of the trunk connecting line phi MV (L MZG,k,i ,L MBG,k,i ): corresponds to L MZG,k,i And L MBG,k,i Is restricted by the net frame networking form, phi HV (L HZG,k,i ,L HLL,k,i ): corresponds to L HZG,k,i And L HLL,k,i Is restricted by the net frame networking form, N H,k And N M,k The types of high-voltage and medium-voltage networking forms in the kth grid coordination scheme (such as 0, 1 and 2 are respectively used for representing radiation type, net type and ring type),
backbone channel connectivity judgment function (equal to 1 for connected, equal to 0 for disconnected), g (L MZG,k,i ,L MBG,k,i ,L HZG,k,j ,L MLL,k,j ) =0: equation constraint equation involving power flow, h (L MZG,k,i ,L MBG,k,i ,L HZG,k,j ,L MLL,k,j ) Less than or equal to 0: inequality constraint equation involving power flow, short circuit and reliability +.>
And->
The load of the kth channel and the maximum allowable value of the load are respectively used for flowing through the kth channel; s is S td : all backbone channel numbers are aggregated.
S3: and evaluating various grid structure combination schemes of the high and medium voltage distribution network by using the power supply safety level, the reliability index and the comprehensive cost, and judging the superiority of the various combination schemes. It should be noted that, the evaluation analysis specifically includes:
on the basis of meeting the corresponding power supply safety level requirements, a high-medium voltage power distribution network frame combination scheme with higher power supply safety level and meeting the principle of lower comprehensive annual cost is selected as a preferable recommended scheme.
In popular terms, the high-voltage distribution network is used as the tail end of the power transmission main network, a task of providing high-quality electric energy for the medium-voltage distribution network is needed, the medium-voltage distribution network is a bridge for connecting the high-voltage distribution network and power consumers, the coordination of the high-voltage distribution network and the medium-voltage distribution network is the mutual matching and compatibility degree between the high-voltage and medium-voltage two voltage grades and different devices, and when any link of the high-voltage distribution network has an under-coordination problem, the phenomena of reduced power supply reliability, reduced power supply quality and poor power supply economy of the distribution network are caused.
Preferably, in order to better explain the substantive meaning of the method for analyzing the power distribution network planning, the embodiment respectively compares the existing three power distribution network coordination planning methods with the method of the invention, the existing comprehensive planning global optimization method of the power distribution network utilizes an improved shortest path genetic strategy to comprehensively plan the pure open-loop power transmission and distribution network with a plurality of voltage levels, and the strategy only considers complex power, voltage, capacity and tree constraint to obtain a global optimization solution, so that the problem of calculation amount caused by large scale of the power distribution network can be solved, and the power distribution network planning can not be well analyzed; 2. the existing main network and distribution network coordination planning method considers constructing a 110kv transformer substation site selection and volume determination model of the coordination degree of the main network and the distribution network, analyzes basic attributes of the transformer substation by using a coordination factor and a main distribution network coordination planning evaluation model, takes a load coefficient as a weight value in combination with a constraint ring coordination planning range, optimizes transformer substation site selection by using an improved weighted minimum tree theory, optimizes site selection aiming at a power distribution network planning structure, cannot predict power distribution network planning in advance, and cannot analyze power planning conditions of the power distribution network from substantial significance; 3. the existing transmission and distribution network situation awareness collaborative method analyzes the rapid awareness of the situation of a distribution network and distribution network planning from the perspective of transmission and distribution collaborative, calculates the state of the power network according to the estimated distribution network load change, carries out the Thevenin equivalence on the power network from a distribution network root node, identifies equivalent parameters, and then accesses the power network after the Thevenin equivalence into the situation of the distribution network after the distribution network is aware of the distribution network load change, and predicts a static voltage stability margin index track from the aspect of distribution network situation awareness collaborative, and has good voltage situation prediction effect, but cannot realize better overall most sexual analysis for distribution network planning and transformation; in summary, three existing methods lack evaluation on coordination of the grid structure of the power distribution network, but the method evaluates various grid structure combination schemes of the high and medium voltage power distribution network by using the power supply safety level, the reliability index and the comprehensive cost, judges the superiority of the various combination schemes, improves the power supply quality and reduces the investment of capital cost, thereby realizing the overall optimality of planning and transformation of the high and medium voltage power distribution network.
Preferably, the traditional high and medium voltage distribution network power supply model research method is too complex, the processing time is longer, errors are easy to occur, the preferred judgment can not be well carried out on the grid structure combination scheme of the distribution network, and in order to verify that the method has better structure combination scheme preference, power supply safety level quality superiority and economic cost cheapness compared with the traditional power supply model research method, the two voltage configuration schemes of the high and medium voltage distribution network in a certain area are respectively evaluated and compared by the traditional method and the method;
test conditions: scheme one 220kv+110kv+10kv, scheme two 220kv+110kv+20kv;
(220 kv distribution network) overhead line power supply, double-loop network wiring, rong Bianliang x 180MVA, 3 x 240MVA, comprehensive cost 24000 ten thousand, 32500 ten thousand;
the power supply of the overhead line (110 kv high-voltage distribution network), radiation, T connection and chain connection, rong Bianliang x 40MVA, 3 x 50MVA, and comprehensive cost of 4500 ten thousand and 4950 ten thousand;
the power supply of the overhead line and the cable line is realized by a (10 kv/20kv medium-voltage distribution network), and the single power supply radiation, the hand-in-hand, the sectional two-connection wiring and the three-supply one-standby wiring are realized, so that the comprehensive cost is 95 ten thousand and 75 ten thousand;
the power supply model analyzes the load change of the power grid to determine the plan of the medium-high voltage distribution network, when the load is in punctiform distribution, the incoming line length (line) of the high-voltage distribution substation is between planar distribution and strip distribution, and the model cannot determine the incoming line length, so that the average value of the planar distribution and the strip distribution is selected to replace calculation;
the method of the invention utilizes MATLB programming and calculation to realize simulation processing and output a curve schematic diagram.
Referring to the schematic diagrams of fig. 2 and fig. 3, the traditional high-medium voltage distribution network power supply model research method and the method of the invention are convenient for analysis aiming at analysis and evaluation output curves of two combination schemes, and along with the increase of the types of grid structures in the combination schemes, the output curves of the method of the invention are closer to actual distribution network planning and transformation than the output curves of the traditional method under the same condition that the cost funds are continuously increased, as shown in the schematic diagrams of fig. 2 and fig. 3, the cost funds provided by the method of the invention are far lower than the cost funds of the traditional method, and the method of the invention is verified to have the effects of improving the power supply quality and reducing the cost funds.
Example 2
Referring to fig. 4, in a second embodiment of the present invention, unlike the first embodiment, there is provided a coordination evaluation system based on a grid structure of a high and medium voltage distribution network, including:
the data processing center module 100 is used for processing various cost and reliability indexes, and comprises a calculating unit 101 and a storage unit 102, wherein the calculating unit 101 is used for calculating annual cost of the high-voltage power distribution network and annual power failure loss cost of the high-voltage power distribution network, and the storage unit 102 is used for storing calculation results and analysis results.
The analysis module 200 is connected with the data processing center module 100, and is configured to receive the calculation result of the calculation unit 101, compare various grid structure combination schemes of the high-medium voltage power distribution network, analyze the power supply safety level, and determine and select an optimal combination scheme for recommendation.
The output management module 300 is connected to the calculation unit 101 and the analysis module 200, and is configured to transmit the calculation result and the information flow, and output the analysis result of the analysis module 200.
It should be noted that, the data processing center module 100 is mainly divided into three layers, including a control layer, an operation layer and a storage layer, where the control layer is a command control center of the data processing center module 100 and is composed of an instruction register IR, an instruction decoder ID and an operation controller OC, where the control layer can sequentially take out each instruction from the storage according to a program pre-programmed by a user, and place the instructions in the instruction register IR, analyze and determine the instructions by the instruction decoder, notify the operation controller OC to operate, and send micro-operation control signals to the corresponding components according to a determined time sequence; the operation layer is a core of the data processing center module 100, and is capable of executing arithmetic operations (such as addition, subtraction, multiplication, division and addition operations) and logical operations (such as shifting, logic testing or two value comparison), and is connected to the control layer to perform operation by receiving a control signal of the control layer; the storage layer is a database of the data processing center module 100 capable of storing data (data to be processed and already processed).
It should be appreciated that embodiments of the invention may be implemented or realized by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer readable storage medium configured with a computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, in accordance with the methods and drawings described in the specific embodiments. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Furthermore, the operations of the processes described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes (or variations and/or combinations thereof) described herein may be performed under control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications), by hardware, or combinations thereof, collectively executing on one or more processors. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable computing platform, including, but not limited to, a personal computer, mini-computer, mainframe, workstation, network or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and so forth. Aspects of the invention may be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and/or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, which when read by a computer, is operable to configure and operate the computer to perform the processes described herein. Further, the machine readable code, or portions thereof, may be transmitted over a wired or wireless network. When such media includes instructions or programs that, in conjunction with a microprocessor or other data processor, implement the steps described above, the invention described herein includes these and other different types of non-transitory computer-readable storage media. The invention also includes the computer itself when programmed according to the methods and techniques of the present invention. The computer program can be applied to the input data to perform the functions described herein, thereby converting the input data to generate output data that is stored to the non-volatile memory. The output information may also be applied to one or more output devices such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects produced on a display.
As used in this application, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, the components may be, but are not limited to: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of example, both an application running on a computing device and the computing device can be a component. One or more components may reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers. Furthermore, these components can execute from various computer readable media having various data structures thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (8)
1. A coordination evaluation method based on a grid structure of a high-voltage and medium-voltage power distribution network is characterized by comprising the following steps of: comprising the steps of (a) a step of,
analyzing the power supply safety level of the high-medium voltage grid structure under N-1 and N-1-1 outage scenes under the corresponding group load level from the high-voltage layer and the medium-voltage layer respectively by utilizing the power supply safety standard of the urban power grid;
calculating the reliability index of the high and medium voltage distribution network and the comprehensive annual cost of the high and medium voltage grid structure by utilizing a coordination calculation strategy;
calculating the reliability index comprises calculating the average power outage time of a low-voltage bus of the high-voltage transformer substation by using a 4N+2M parameter equivalent power supply coordination calculation strategy, taking the average power outage time as a reliability parameter of an equivalent power supply of an upper power grid of a medium-voltage feeder, and calculating the reliability index of the medium-voltage power distribution network influenced by the high-voltage power network again by using the reliability parameter and combining a power distribution network reliability evaluation forward fault diffusion strategy based on capacity and voltage constraint, wherein the average power outage time is defined as the average power outage time of the medium-voltage power distribution network;
evaluating various high and medium voltage power distribution network grid structure combination schemes by utilizing the power supply safety level, the reliability index and the comprehensive annual cost of the high and medium voltage grid structure, and judging the superiority of the various combination schemes;
on the basis of meeting the corresponding power supply safety level requirements, selecting a high-medium voltage power distribution network grid structure combination scheme with higher power supply safety level and meeting the principle of lower comprehensive annual cost of the high-medium voltage grid structure as an optimal recommendation scheme.
2. The coordination evaluation method based on the grid structure of the high-voltage and medium-voltage power distribution network as claimed in claim 1, wherein the method comprises the following steps: comprising the steps of (a) a step of,
calculating the annual cost of the high-voltage distribution network and the annual cost of the medium-voltage distribution network respectively;
converting the average power outage time of the medium-voltage distribution network into annual cost of high-medium-voltage power outage loss;
and integrating the Gao Zhongya annual cost of power failure loss with the annual cost of the high and medium voltage distribution network to obtain the comprehensive annual cost of the high and medium voltage grid structure.
3. The coordination evaluation method based on the grid structure of the high-voltage and medium-voltage power distribution network as claimed in claim 2, wherein: calculating the annual cost of the high-voltage distribution network, wherein the annual cost of the high-voltage transformer substation, the annual cost of high-voltage line investment, the annual cost of high-voltage switch investment and the annual cost of high-voltage line electric energy loss;
calculating the annual cost of the medium-voltage distribution network comprises the annual cost of investment of a medium-voltage line, the annual cost of electric energy loss of the medium-voltage line and the feeder automation cost.
4. A method for coordinated evaluation based on grid structures of high and medium voltage distribution networks according to claim 3, wherein: calculating the annual cost of investment for the high voltage line includes,
C hvxt ＝εL hv C hv
ε＝k y +k h
wherein L is hv : length of high voltage line, C hv : comprehensive manufacturing cost, k of single-unit length of high-voltage line y And k h The operation maintenance cost coefficient and the investment recovery coefficient containing depreciation are respectively;
the high voltage switch invests annual cost,
C kt ＝εN k C k
wherein N is k : total number of switches C k : a single switch price;
the annual cost of the electric energy loss of the high-voltage line,
C xs-hv ＝C e-hv ΔP max-hv τ max-hv
wherein DeltaP max-hv : maximum power loss of line τ max-hv : hours of maximum load loss, C e-hv :110kV electricity purchasing price;
calculating the annual cost of investment of the medium-voltage circuit,
C mvxt ＝ε×k q ×R mv ×N s ×n t ×n l ×c mvl
wherein k is q : taking the bending coefficient of the medium-voltage line of the branch line into consideration, R mv : power supply radius of medium voltage line, N s : number of 110kV transformer substations, n t : main leveling average number, n, of 110kV transformer substation l : average outgoing line number of single main transformer, c mvl : the comprehensive cost of the unit length of the medium-voltage circuit;
the annual cost of the electric energy loss of the medium-voltage circuit,
C xs-mv ＝C e-mv ΔP max-mv τ max-mv
wherein DeltaP max-mv : maximum power loss of line τ max-mv : hours of maximum load loss, C e-mv :10kV electricity purchasing price;
and the feeder line automation cost is calculated by utilizing a medium-voltage distribution network grid structure.
5. The coordination evaluation method based on the grid structure of the high-voltage and medium-voltage power distribution network as claimed in claim 3 or 4, wherein: comprising the steps of (a) a step of,
the average power outage time of the medium voltage distribution network users is utilized to calculate the adult power outage loss cost,
C ks ＝C E P max ξSAIDI
wherein C is E : the power failure cost of the unit electric quantity is generally estimated according to the power generation ratio method, and the calculation is simple and the data is easy to obtain; p (P) max And xi are the maximum load value and load factor, respectively; SAIDI: the average power outage duration of the user year.
6. The coordination evaluation method based on the grid structure of the high-voltage and medium-voltage power distribution network as claimed in claim 5, wherein the method comprises the following steps: the comprehensive annual cost calculation of the high and medium voltage grid structure comprises the annual cost of the high and medium voltage distribution network and the annual power failure loss cost of the high and medium voltage network, and is as follows
C HML,k ＝C HV,k +C MV,k +C HMT,k
C HML,k : grid total cost of kth coordination scheme, C HV,k 、C MV,k And C HMT,k The annual cost of the high-voltage distribution network, the annual cost of the medium-voltage distribution network and the annual power failure loss cost of the high-voltage and medium-voltage distribution network of the kth coordination scheme are respectively calculated.
7. The coordination evaluation method based on the grid structure of the high-voltage and medium-voltage power distribution network as claimed in any one of claims 1-4, wherein: comprising the steps of (a) a step of,
the high-voltage layer comprises a high-voltage line, a high-voltage line channel, a transformer substation and a main transformer thereof;
the medium voltage layer comprises a medium voltage circuit and a medium voltage circuit channel.
8. A coordination evaluation system based on a grid structure of a high-voltage power distribution network and a medium-voltage power distribution network is characterized in that: comprising the steps of (a) a step of,
the data processing center module (100) is used for respectively analyzing the power supply safety levels of the high-medium voltage grid structure under the corresponding group load levels from the high-voltage layer and the medium-voltage layer by utilizing the urban power grid power supply safety standard to process various cost and reliability indexes, and comprises a calculation unit (101) and a storage unit (102), wherein the calculation unit (101) is used for calculating the reliability index of the high-medium voltage distribution network and the comprehensive annual cost of the high-medium voltage grid structure by utilizing a coordinated calculation strategy, the calculation of the reliability index comprises the calculation of the average power outage time of a low-voltage bus of the high-voltage transformer substation by utilizing a 4N+2M parameter equivalent power supply coordinated calculation strategy, the average power outage time is used as the reliability parameter of an equivalent power supply of an upper power grid of a medium-voltage feed line, and the reliability index of the medium-voltage distribution network influenced by the high-voltage power grid is calculated again by combining a power outage reliability estimation front-push fault diffusion strategy based on capacity and voltage constraint, so as to define the average power outage time of the medium-voltage distribution network;
the storage unit (102) is used for storing the calculation result and the analysis result;
the analysis module (200) is connected with the data processing center module (100) and is used for receiving the calculation result of the calculation unit (101), evaluating various high and medium voltage power distribution network grid structure combination schemes by utilizing the power supply safety level, the reliability index and the comprehensive annual expense of the high and medium voltage grid structure, judging the superiority of the various combination schemes, and selecting various high and medium voltage power distribution network grid combination schemes with higher power supply safety level and meeting the principle of lower comprehensive annual expense of the high and medium voltage grid structure as a preferable recommendation scheme on the basis of meeting the corresponding power supply safety level requirement; the output management module (300) is connected with the calculation unit (101) and the analysis module (200) and is used for transmitting the calculation result and the information flow and outputting the analysis result of the analysis module (200).
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