CN117220337A - Island division recovery method and system considering double-layer optimization of power grid and highway network - Google Patents
Island division recovery method and system considering double-layer optimization of power grid and highway network Download PDFInfo
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Abstract
The application relates to an island division recovery method and system considering double-layer optimization of a power grid and a highway network, belonging to the field of power systems, and comprising the following steps of S1, collecting power grid side fault information and highway network side road condition information, and respectively establishing power grid side and highway network side target functions; step S2, carrying out island coupling division on the power grid side and the highway network side based on the acquired power grid side fault information and highway network side road condition information to obtain island coupling division ranges; and S3, constructing an objective function and a corresponding constraint condition, and acquiring a highway network side optimal emergency power supply vehicle moving path and a power grid side maximum load recovery amount in the island coupling dividing range based on the objective function and the constraint condition so as to recover power supply of the highway network side and the power grid side respectively. The method is used for solving the problem that under the condition of extreme disaster faults, the novel power distribution network fault recovery considers the actual conditions of the power grid side and the highway network side, the island coupling division strategy and the fault recovery method are obtained, and the fault load recovery quantity is improved.
Description
Technical Field
The application belongs to the technical field of power systems, and particularly relates to an island division recovery method and system considering double-layer optimization of a power grid and a highway network.
Background
The expressway is used as a convenient and quick infrastructure and plays an important role in promoting inter-provincial connection and production and life. Meanwhile, the surroundings of the expressway are clear, the traffic infrastructure is developed nearby and natural resource endowments are enriched nearby by utilizing the areas along the expressway, a fan, a photovoltaic and an energy storage device are built, and the expressway self-consistent energy system is an effective energy supply mode of the expressway in the future.
Under the energy transformation background, the self-consistent energy system presents stronger openness, complexity and uncertainty, the highway system is wider in distribution along the line and the net rack is complex, so that the traditional reliability control strategy of the power distribution network cannot cope with extreme natural disasters and artificial damages, the highway network belongs to the terminal power network of the power network in China, the support of the power system is poor, and the vulnerability of the terminal power network further aggravates the challenges of fault recovery of the highway network under the extreme disasters.
In a conventional power distribution network, once a superior power grid fails, all equipment within the power distribution network must be shut down, but in a power distribution network containing distributed energy sources, the power loss area can be powered back through the distributed power sources and the energy storage devices. Therefore, a reasonable island division strategy is carried out, the fault network and the main network are disconnected, and the distributed power supply and the energy storage device in the island are utilized to recover power supply, so that the method has important significance for improving the running stability and reliability of the power distribution network. Most of the island division technologies nowadays aim at maximizing recovery load from the perspective of a power grid, and the aspects of consideration are mainly concentrated on an urban power distribution network, and the coupling relation between an expressway network and the power grid is not considered, so that when the expressway network fails under extreme disasters, how to formulate a reasonable island division strategy to improve recovery efficiency and load capacity becomes critical.
Disclosure of Invention
In view of the above analysis, the embodiments of the present application aim to provide an island division recovery method and system considering double-layer optimization of a power grid and a highway network, so as to solve the technical problems of existing island division technologies, most of which are from the perspective of the power grid, with the maximum recovery load as the target, and the consideration aspect mainly focused on an urban power distribution network, without considering the highway network and the coupling relationship between the power grid and the highway network for island division.
In order to solve the defects in the prior art, the application provides an island division recovery method and system considering double-layer optimization of a power grid and a highway network. From the double-layer consideration of the power grid side and the highway network side, the power grid side starts from source measurement, and determines the approximate range of the island by searching whether distributed power sources exist near the fault, so that the distributed power sources are ensured to be contained in the island; the road network side starts from the load side, determines the node contained in each island, considers the traffic load importance degree, ensures that important load nodes are inside the islands, and ensures the integrity of the roads between the islands so as to meet the traffic of emergency power supply vehicles. And adding secondary scheduling in the process of recovering faults through island division, so as to improve the recovery capacity of the expressway network.
The application provides an island division recovery method considering double-layer optimization of a power grid and a highway network, which comprises the following steps:
step S1, collecting power grid side fault information and road network side road condition information, and respectively establishing a power grid side target function and a road network side target function;
step S2, carrying out island coupling division on the power grid side and the highway network side based on the acquired power grid side fault information and highway network side road condition information to obtain island coupling division ranges;
and S3, constructing an objective function and corresponding constraint conditions based on the island coupling division range, and obtaining a highway network side optimal emergency power supply vehicle moving path and a power grid side maximum load recovery amount in the island coupling division range based on the objective function and the constraint conditions so as to recover power supply of the highway network side and the power grid side respectively.
Further, the establishing the grid-side objective function includes:
collecting power grid side fault information, including distributed power supply, energy storage position, power output condition and fault load nodes;
based on the grid-side fault information, a grid-side objective function is established as follows:
wherein L represents a set formed by all load nodes at the power grid side, and w i Representing the weight of the load at node i,a variable of 0 or 1, wherein the values of 1 and 0 respectively represent load recovery and non-recovery, P i,t Representing the load recovery amount of the i node in the t period.
Further, the establishing a road network side objective function includes:
collecting road network side road condition information including extreme weather conditions, road traffic conditions and fault load nodes;
based on the road network side road condition information, a road network side target function is established as follows:
wherein omega k G is the load importance degree of the fault node k at the road network side ij Recovering after accessing the jth isolated network for the ith emergency power supply vehicleLoad set, T ij For the power supply time of the ith emergency power supply vehicle in the jth isolated network, t k,k-1 For the transition time between the kth fault and the kth-1 fault, n is the number of power supply vehicles of the isolated network, m is the number of the isolated network, G k Is a set of fault load nodes.
Further, the island coupling division of the power grid side and the highway network side is performed, and the island coupling division range is obtained as follows:
starting island division from the power grid side to obtain an island division range of the power grid side;
and on the basis of the island division range of the power grid side, continuing island coupling division by the highway network side to obtain the island coupling division range.
Further, the step of starting island division from the power grid side to obtain the island division range of the power grid side includes:
judging whether a distributed power supply or an energy storage device is contained in the island at the power grid side;
if the power grid side island contains a distributed power supply or an energy storage device, determining to divide the power grid side island range;
otherwise, the island division adjustment of the power grid side is carried out again, the island division range is enlarged until the distributed power supply or the energy storage device exists in the island, and the island division range of the power grid side is determined.
Further, based on the grid side island division range, the highway network side continues island coupling division, and the obtaining of the island coupling division range includes:
dividing traffic load grades at the road network side, and determining the load grade of each node at the road network side;
based on the load level of each node, dividing all important load nodes into island dividing ranges at the power grid side according to a nearby principle to obtain island coupling dividing ranges, and simultaneously determining that roads in the island coupling dividing ranges can pass so as to enable the roads among the islands to be shortest and shorten the passing time of emergency power supply vehicles.
Further, the constructing constraint conditions corresponding to the objective functions of the power grid side and the highway network side includes:
establishing an emergency power supply vehicle output constraint;
establishing topology constraint, system power flow constraint and system safety constraint of a power distribution network; the system security constraints include an operating voltage constraint and a branch capacity constraint;
and establishing operation constraints of the power distribution network, including distributed energy constraints and energy storage constraints.
Further, obtaining the road network side optimal emergency power supply vehicle moving path and the power network side maximum load recovery amount within the island coupling dividing range comprises the following steps:
based on the grid-side and highway-side objective functions and the corresponding constraint conditions, substituting the constraint conditions into the objective functions by using a large M method, and solving the objective functions;
and relaxing the operation constraint of the power distribution network and the topology constraint of the power distribution network by using a large M method so that the active power, reactive power and line current of the open branch are zero and the closed branch is unconstrained.
Further, the road network side traffic load level comprises a special load, a primary load, a secondary load and a tertiary load, wherein the special load and the primary load are important load nodes.
The step S1 further comprises the step of obtaining the capacity and the position information of the emergency power supply vehicle.
The present specification also provides an island division recovery system considering double-layer optimization of a power grid and a highway network, comprising:
the objective function establishing module M1 is used for collecting power grid side fault information and road network side road condition information and respectively establishing power grid side and road network side objective functions;
the island dividing module M2 is used for carrying out island coupling division on the power grid side and the highway network side based on the acquired power grid side fault information and highway network side road condition information to obtain an island coupling division range;
and the objective function solving module M3 is used for constructing constraint conditions corresponding to the objective function based on the island coupling dividing range, and obtaining the maximum load recovery quantity of the optimal emergency power supply vehicle moving path at the highway network side and the maximum load recovery quantity at the power grid side in the island coupling dividing range based on the objective function and the constraint conditions so as to recover power supply at the highway network side and the power grid side respectively.
Compared with the prior art, the application has at least one of the following beneficial effects:
1. according to the application, island division is carried out by considering double-layer optimization of the power grid side and the highway network side, and the influence of the distributed power supply on fault recovery is considered from the power grid side, so that the power supply in the island is ensured to supply power for important load; considering the traffic load importance degree from the road network side, the traffic condition between roads can be considered, and the integrity of the road between islands is ensured. Under the condition that the island divided in this way meets the energy supply in the island, the complementation among the islands can be realized, and the important load of each island is ensured to restore the power supply;
2. by knowing the load characteristics of the secondary load and the tertiary load, the controllable load is reasonably utilized, and the power balance in the island is further ensured under the condition that important load nodes are supplied with power preferentially by utilizing the controllable load;
3. according to the application, the emergency power supply vehicle position is arranged in advance to ensure the rapid power supply of important load nodes, meanwhile, the emergency power supply vehicle is considered for secondary scheduling, and the emergency power supply vehicle is switched to other islands to continue power supply under the condition that the emergency power supply vehicle has redundancy, so that the recovery amount of the final load is increased.
In the application, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the application 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 application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the application, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a flow chart of an island division recovery method considering double-layer optimization of a power grid and a highway network;
FIG. 2 is a schematic diagram of an IEEE33 node provided;
FIG. 3 is a schematic view of a highway network;
FIG. 4 is a schematic diagram of policy-island partitioning;
FIG. 5 is a schematic diagram of policy two island partitioning;
FIG. 6 is a schematic diagram of strategy one and two load fault recovery amount comparison;
fig. 7 is a schematic diagram of an island division recovery system considering grid and highway network double-layer optimization.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
The embodiment of the application provides an island division recovery method and system considering double-layer optimization of a power grid and a highway network, wherein the island division strategy is formulated by researching the positions of a distributed power supply and energy storage at the power grid side, the characteristics of important load nodes at the highway network side and the accessibility between roads through double-layer consideration from the power grid side and the highway side, so that the fault recovery efficiency is effectively improved, and the load recovery amount is increased.
Embodiment one:
as shown in fig. 1, an island division recovery method considering double-layer optimization of a power grid and a highway network comprises the following steps:
step S1, collecting power grid side fault information and road network side road condition information, and respectively establishing a power grid side target function and a road side target function;
step S2, carrying out island coupling division on the power grid side and the highway network side based on the acquired power grid side fault information and highway network side road condition information to obtain island coupling division ranges;
and step S3, constructing an objective function and corresponding constraint conditions based on the island coupling division range, and obtaining the optimal emergency power supply vehicle moving path at the road network side and the maximum load recovery amount at the power grid side in the island coupling division range based on the objective function and the constraint conditions so as to recover power supply to the road network side and the power grid side respectively.
Step S1 specifically includes steps S11 to S13.
Step S11, collecting power grid side fault information and road network side road condition information;
the road network side information comprises extreme weather conditions, road traffic conditions and fault load nodes;
the power grid side fault information comprises a distributed power supply, an energy storage position, a power output condition and a fault load node;
the collected grid-side fault information and highway network-side road condition information are prepared for the specification of a subsequent island division and fault recovery strategy;
in the step, the capacity and position information of the emergency power supply vehicle are also obtained, and when a fault recovery strategy is formulated, which power supply vehicle goes to which node to recover power supply on the power grid side or the highway network side is determined.
And step S12, establishing a power grid side objective function based on the power grid side fault information.
Based on the obtained power grid side fault information, a power grid side objective function is established, as shown in a formula (1):
wherein L represents a set of all load nodes, w i Representing the weight of the load at node i,a variable of 0 or 1, wherein the values of 1 and 0 respectively represent load recovery and non-recovery, P i,t Representing the load recovery amount of the i node in the t period. Wherein w is i And (5) taking a value according to the specific load important condition.
The grid side objective function is to obtain the grid side maximum load recovery.
And step S13, establishing a road network side objective function based on the road network side road condition information.
Based on the obtained road network side road condition information, a road network side target function is established, as shown in a formula (2):
wherein omega k G is the load importance degree of the fault node k at the road network side ij Load set recovered after accessing the jth isolated network for the ith emergency power supply vehicle, T ij For the power supply time of the ith emergency power supply vehicle in the jth isolated network, t k,k-1 For the transition time between the kth fault and the kth-1 fault, n is the number of power supply vehicles of the isolated network, m is the number of the isolated network, G k Is a set of fault load nodes.
The road network side objective function is used for path optimization so as to achieve the purposes of shortest transfer time and longest power supply time of the emergency power supply vehicle.
Step S2, specifically.
And S21, starting island division from the power grid side to obtain a power grid side island division range.
Based on the obtained grid side fault information, determining an island dividing approximate range from the grid side, determining fault nodes, searching whether distributed power sources and energy storage devices exist near the fault nodes, dividing the nodes containing the distributed power sources and the energy storage devices into the island range, expanding the range gradually, and expanding the island range as much as possible under the condition that the island contains the distributed power sources and the energy storage devices, so as to obtain the approximate island range containing the distributed power sources or the energy storage devices.
Firstly, judging whether a distributed power supply or an energy storage device is contained in an island at the power grid side;
secondly, if the island contains a distributed power supply or an energy storage device, determining to divide the island range;
and thirdly, if the island does not contain a distributed power supply or an energy storage device, carrying out grid side island division adjustment again, and expanding the island division range until the existence of the distributed power supply or the energy storage device in the island is ensured, so as to obtain the grid side island division range.
And S22, continuously carrying out island coupling division on the highway network side based on the island division range of the power grid side to obtain an island coupling division range.
On the basis of the grid side island division range, the highway network side continues island coupling division, and from the importance degree of load and the integrity of roads, the node contained in each island is determined, which specifically comprises the following steps:
dividing traffic load grades at the road network side, and determining the load grade of each node at the road network side;
the load class classification principle of each node at the highway network side is as follows:
the electric facilities for highway traffic include management facilities, outfield facilities, field facilities, tunnel facilities, etc. According to the actual electricity utilization condition and the application of the expressway self-consistent energy system, the traffic load nodes are divided into four load levels according to the importance degree.
Special class load: loads associated with significant safety issues for highways, such as: tunnel emergency lighting, tunnel fire protection, portal facilities, etc.;
primary load: loads associated with highway operating conditions, such as: monitoring systems, communication systems, toll lane lighting, etc.;
secondary load: the loads associated with the expressway and the service area are not high in safety importance, for example: tunnel lighting, office building fire protection, office building emergency lighting, etc.;
three-stage load: the general load of the associated highway, for example: general lighting, office loads, charging posts, etc.
Wherein, the super-grade load and the first-grade load are important load nodes.
As shown in fig. 2, the load levels of the road side specific load nodes are shown in table 1.
Table 1, road side load node load class table
A load recovery set is established according to the load level, as shown in formula (3):
wherein,represents a load recovery set, w i,t Represents the importance degree of load, P i,t And (5) representing the load recovery amount of the i node in the t period.
Wherein w is i,t The load importance degree is represented, and the value is as follows:
(1) Special class load w i,t Defined as 4;
(2) First-stage load w i,t Defined as 3;
(3) Two-stage load w i,t Defined as 2;
(4) Three-stage load w i,t Defined as 1.
In the fault recovery process, to ensure the safety of the expressway and the trafficability of the traffic road, it is necessary to keep:
(1) The important load nodes (including the special-level load and the first-level load) are powered in percentage;
(2) The secondary load supplies power as much as possible;
(3) The three-stage load may cut off part of the load.
The three-stage load comprises part of controllable loads, such as office loads and charging piles, and can play a role in absorbing the distributed power supply and maintaining power balance. The transferable loads are modeled as shown in equations (4) - (5):
wherein,represents the maximum power of the interruptible load, eta represents the transferable load coefficient, omega ch Represents the transferable load node set, μ∈ (0, 1), ++>Representing the required load recovery amount, P, in the t period t Is the initial power.
Meanwhile, in order to realize the consumption of the distributed power supply, an expected load curve is fitted, and variance is introduced to represent the deviation degree of load demand and load output, as shown in a formula (6):
where k is the degree of deviation of the load demand and the load force, n is the fault recovery time,representing load demand, P t For t period of power, P ESS The load amount for the total stored energy.
And secondly, dividing all important load nodes into island dividing ranges at the power grid side according to a nearby principle based on the load grade of each node to obtain island coupling dividing ranges, and simultaneously determining that roads in the island coupling dividing ranges can pass so as to enable the roads among the islands to be shortest and shorten the passing time of emergency power supply vehicles.
Starting from the road network side load, dividing important load nodes into grid side island division according to a nearby principle.
The important load comprises a special-grade load and a primary load, meanwhile, whether roads capable of passing through exist among the islands or not is observed, connection of the roads except for connecting lines among the islands is ensured, and complementary mutual aid among the islands is ensured.
And the capacity and the position information of the emergency power supply vehicle are clarified, and scheduling planning is performed on nodes to which the emergency power supply vehicle needs to go in the early stage of fault recovery in advance.
Step S3, specifically.
The method comprises the following steps:
and S31, constructing constraint conditions corresponding to the power grid side and highway side objective functions based on the island coupling division range.
The constraint conditions corresponding to the power grid side and highway side objective functions are constructed as follows:
establishing an emergency power supply vehicle output constraint;
establishing topology constraint, system power flow constraint and system safety constraint of a power distribution network;
establishing operation constraints of the power distribution network, including distributed energy constraints and energy storage constraints;
and solving the models such as the objective function and the like to obtain the highway network fault recovery method.
And firstly, establishing the output constraint of the emergency power supply vehicle.
Active power balance constraint of emergency power supply vehicle is as shown in formula (7):
wherein P is G,i Represents the generated energy of the i-node emergency power supply vehicle, P L,j Representing the load recovery amount of the node, j represents the load recovery node, as shown in formula (8):
P G,i ≥P i ,i∈Ω z (8)
wherein P is G,i Represents the generated energy of the i-node emergency power supply vehicle, P i Representing the electricity shortage except that wind power, photovoltaic and energy storage are removed from the i node to supply power to the i node, i epsilon omega z Representing a set of important load nodes.
T G,i ≥0 (9)
Wherein T is G,i Representing the service time of the i-node emergency power supply vehicle.
And secondly, establishing topology constraint, system power flow constraint and system safety constraint of the power distribution network.
The topology constraints of the distribution network are as shown in formula (10):
wherein b ij,t 、b ji,t Representing the child-parent relationship between the i node and the j node in the t period, if the j node is the parent node of the i node, b ij ＝1，b ji =0, otherwise b ji ＝1，b ij =0, if node i is not connected to node j, b ij ＝b ji =0, Ω represents the set of all nodes, Ω G Representing a set of failed nodes, a ij,t The power-on state of the line ij representing the t period is 1, and vice versa is 0.
System power flow constraints as shown in formulas (11) - (16):
wherein P is ki,t Representing the active power transmitted by line ki in t period, P t,i Representing the active power of the inode in the t period, Q ki,t Representing reactive power, Q, transmitted by line ki in time period t t,i Representing reactive power of inode representing t period, a t,i The load on-off relation of the node i in the t period is represented, U t,j Representing the voltage at node j of period t, P t,ij Representing the active power transmitted by the t-period line ij, r ij Representing the resistance, x, of branch ij ij Representing reactance of branch ij, Q t,ij Representing the reactive power transmitted by the line ij during the period t,representing the square of the current flowing through the branch ij during time t, a ij,t The power-on state representing the t-period line ij is represented.
Wherein I is ij,t Representing the amplitude of the current flowing through the branch ij in the period t, U t,i Represents the voltage amplitude at node i of period t, r ki Representing the resistance, x, of branch ki ki Representing reactance of branch ki, P ij,t 、Q ij,t Representing the active power and reactive power transmitted by the t-period line ij respectively,respectively representing active power and reactive power of a distributed power supply injected into a node i in a t period; />Respectively representing active power and reactive power released by energy storage at a node i in a t period; />Representing the active power and reactive power consumed by the load on node i in the t period respectively.
The system security constraints include an operating voltage constraint and a bypass capacity constraint, wherein:
operating voltage constraints, as shown in equation (17):
wherein,and->Respectively representing the minimum and maximum voltage which can be born by the node i;
the branch capacity constraint is as shown in equation (18):
wherein,represents the maximum current that branch ij can pass, +.>The square of the current flowing through the branch ij for the period t.
Thirdly, establishing operation constraint of the power distribution network, wherein the operation constraint comprises distributed energy constraint and energy storage constraint.
The method comprises the following steps:
distributed energy constraints, as shown in formulas (19) - (21):
wherein,respectively representing active power and reactive power emitted by a power supply at an i node in a t period;representing the upper and lower limits of the power supply active force at the i node in the t period; />For the upper limit of the reactive power output of the power supply at the inode in the t period, +.>And accessing the capacity of the power supply for the inode.
Energy storage constraints, as shown in equations (22) - (26):
P t ESS ＝P t ESS,d -P t ESS,c (22)
P t ESS,d,min ≤P t ESS,d ≤P t ESS,d,max (23)
P t ESS,c,min ≤P t ESS,c ≤P t ESS,c,max (24)
wherein P is t ESS Representing the power of the storage battery energy storage system injected into the power grid in the period t, P t ESS,c 、P t ESS,d Respectively representing the charge and discharge power, P, of the storage battery energy storage system in the period t t ESS,d,min 、P t ESS,d,max Respectively represent upper and lower limits of discharge power, P t ESS,c,min 、P t ESS,c,max Representing the upper and lower limits of the charging power respectively,reactive power emitted by energy storage at an inode in a time plane t; />For the upper limit of the energy storage reactive power at the i node, < + >>For the energy storage charge and discharge power at the i node in the time period t, the charge power is positive, the discharge power is negative, < ->Is the capacity of the stored energy at the inode.
And S32, acquiring the optimal emergency power supply vehicle moving path of the highway network side and the maximum load recovery quantity of the power network side in the island coupling dividing range based on the target functions of the power network side and the highway network side and the corresponding constraint conditions so as to recover power supply of the highway side and the power network side respectively.
Based on the grid-side and highway-side objective functions and the corresponding constraint conditions, substituting the constraint conditions into the objective functions by using a large M method, and solving the objective functions;
and solving the objective function based on the objective function and the corresponding constraint condition, and acquiring a highway network side optimal emergency power supply vehicle moving path and a power grid side maximum load recovery amount in the island coupling dividing range so as to recover power supply of the highway side and the power grid side respectively. Ensuring that the important loads are fully recovered.
Introduction ofAnd->Replace->And->The large M method is used for relaxing the operation constraint of the power distribution network and the topology constraint of the power distribution network, so that the active power, the reactive power and the line current of an open branch are zero, and the closed branch is unconstrained, as shown in formulas (27) - (33):
wherein,and->Respectively, the sum of the squares of the voltages at the inode of the t period and the squares of the current flowing through the branch ij, M representing an infinite number, a ij Represents the energized state of line ij for period t, < >>Representing the square of the voltage at node j of period t.
The basic idea of the big M method is to introduce constraints into the objective function, by introducing a positive number (usually denoted by the uppercase letter M) as a multiplier, to constrain the value of the objective function to meet the constraints. This positive number M is large enough that the value of the objective function approaches the optimal solution.
The large M method is used to relax the operation constraint of the distribution network, i.e. relax some conditions, such as: in topology constraints, if the state of a branch is binary (0 means open, 1 means connected), it can be relaxed into a continuous variable using the large M method to take a value between 0 and 1. This M is a positive number large enough to ensure that in the optimal solution, this variable is either close to 0 or close to 1, but not so much fluctuating. The problem is easier to solve.
The island division recovery method considering double-layer optimization of the power grid and the highway network provided by the embodiment of the application provides a specific example for verifying the effectiveness of the fault recovery method, and the specific example is provided for verification: with the improved IEEE33 node distribution network and the road network coupled thereto (as shown in fig. 3) as shown in fig. 2, if extreme weather occurs, the distribution network lines 6-7, 19-20, 31-32 fail, and disconnect from the main network, and the connection lines between the nodes 12 and 22 cannot be connected due to the failure, the expected outage time is four hours.
Strategy one: in order to use the fault recovery method for island division by considering the coupling of the power grid and the highway network, which is provided by the scheme, after receiving the extreme weather message, island division is performed by considering the double layers of the power grid side and the highway network side, so that the load nodes are ensured to be divided into islands as much as possible, and meanwhile, the stop points of the emergency power supply vehicle are planned.
And the distributed power supply and the energy storage are used for supplying power, part of three-level loads are cut off, and meanwhile, controllable loads are regulated and controlled. At the later stage of the fault, whether the emergency power supply vehicle has residual force or not is checked, secondary dispatching is carried out, power supply is carried out in the area of insufficient power supply, and the slave node 12 is dedicated to the node 22.
Strategy II: after the disaster message is received, the island range is divided by searching whether load nodes exist near the distributed power supply or not only from the power grid side, fault recovery is carried out after the division is completed, advanced planning of an emergency power supply vehicle is not carried out, secondary scheduling is not carried out, and controllable loads are not considered.
Analysis of the example graph: according to the policy one island division schematic diagram of fig. 4 and the policy two island division schematic diagram of fig. 5, it can be seen that, compared with the policy two, the policy one island division scope is larger, the island contains more load nodes, and meanwhile, the emergency power supply vehicle and the control of the controllable load are laid out in advance, so that the load recovery amount in the early stage of fault recovery is improved.
As can be seen from fig. 6, in the later period of fault recovery, the tie line fault between the nodes 12 and 22 cannot be connected, the second strategy cannot provide dedicated supply for the islands, and the first strategy ensures the integrity of the road between the islands, realizes dedicated supply between the islands, provides power for weaker islands, and improves the load recovery amount in the later period.
It can be concluded that: the island division recovery method considering double-layer optimization of the power grid and the highway network can improve the overall load recovery amount and ensure the sustainability of fault recovery.
Embodiment two:
the application further discloses an island division recovery system considering double-layer optimization of a power grid and a highway network, so that the island division recovery method considering double-layer optimization of the power grid and the highway network in the first embodiment is realized. The specific implementation of each module refers to the corresponding description in the first embodiment.
As shown in fig. 7, the system includes a collection module M1, an island division module M2, and an objective function solution M3, which are respectively:
the collection module M1 is used for collecting power grid side fault information and road network side road condition information and respectively establishing a power grid side target function and a road network side target function;
the island dividing module M2 is used for carrying out island coupling division on the power grid side and the highway network side based on the acquired power grid side fault information and highway network side road condition information to obtain an island coupling division range;
and the objective function solving module M3 is used for constructing an objective function and corresponding constraint conditions based on the island coupling dividing range, and obtaining the optimal emergency power supply vehicle moving path at the road network side and the maximum load recovery amount at the power grid side in the island coupling dividing range based on the objective function and the constraint conditions so as to recover power supply at the road network side and the power grid side respectively. .
Since the relevant parts of the system in this embodiment and the method in the first embodiment can be referred to each other, the description is repeated here, and thus the description is omitted here. The principle of the system embodiment is the same as that of the method embodiment, so the system embodiment also has the corresponding technical effects of the method embodiment.
The present application has been described in detail above, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. Many other changes and modifications may be made without departing from the spirit and scope of the application. It is to be understood that the application is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program to instruct associated hardware, where the program may be stored on a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application.
Claims (10)
1. An island division recovery method considering double-layer optimization of a power grid and a highway network is characterized by comprising the following steps:
step S1, collecting power grid side fault information and road network side road condition information, and respectively establishing a power grid side target function and a road network side target function;
step S2, carrying out island coupling division on the power grid side and the highway network side based on the acquired power grid side fault information and highway network side road condition information to obtain island coupling division ranges;
and S3, constructing an objective function and corresponding constraint conditions based on the island coupling division range, and obtaining a highway network side optimal emergency power supply vehicle moving path and a power grid side maximum load recovery amount in the island coupling division range based on the objective function and the constraint conditions so as to recover power supply of the highway network side and the power grid side respectively.
2. The island division restoration method according to claim 1, wherein the establishing a grid-side objective function includes:
collecting power grid side fault information, including distributed power supply, energy storage position, power output condition and fault load nodes;
based on the grid-side fault information, a grid-side objective function is established as follows:
wherein L represents a set formed by all load nodes at the power grid side, and w i Representing the weight of the load at node i,a variable of 0 or 1, wherein the values of 1 and 0 respectively represent load recovery and non-recovery, P i,t Representing the load recovery amount of the i node in the t period.
3. The island division restoration method according to claim 2, wherein the establishing a road network side objective function includes:
collecting road network side road condition information including extreme weather conditions, road traffic conditions and fault load nodes;
based on the road network side road condition information, a road network side target function is established as follows:
wherein omega k G is the load importance degree of the fault node k at the road network side ij Load set recovered after accessing the jth isolated network for the ith emergency power supply vehicle, T ij For the power supply time of the ith emergency power supply vehicle in the jth isolated network, t k,k-1 For the transition time between the kth fault and the kth-1 fault, n is the number of power supply vehicles of the isolated network, m is the number of the isolated network, G k Is a set of fault load nodes.
4. The island division recovery method according to claim 3, wherein the performing island coupling division on the grid side and the highway network side obtains an island coupling division range of:
starting island division from the power grid side to obtain an island division range of the power grid side;
and on the basis of the island division range of the power grid side, continuing island coupling division by the highway network side to obtain the island coupling division range.
5. The island division recovery method according to claim 4, wherein the starting island division from the grid side, obtaining the grid side island division range includes:
judging whether a distributed power supply or an energy storage device is contained in the island at the power grid side;
if the power grid side island contains a distributed power supply or an energy storage device, determining to divide the power grid side island range;
otherwise, the island division adjustment of the power grid side is carried out again, the island division range is enlarged until the distributed power supply or the energy storage device exists in the island, and the island division range of the power grid side is determined.
6. The island division recovery method according to claim 5, wherein the obtaining the island coupling division range based on the grid-side island division range by continuing island coupling division on the highway network side comprises:
dividing traffic load grades at the road network side, and determining the load grade of each node at the road network side;
based on the load level of each node, dividing all important load nodes into island dividing ranges at the power grid side according to a nearby principle to obtain island coupling dividing ranges, and simultaneously determining that roads in the island coupling dividing ranges can pass so as to enable the roads among the islands to be shortest and shorten the passing time of emergency power supply vehicles.
7. The island division recovery method of claim 6, wherein the constructing constraints corresponding to the grid-side and highway-side objective functions comprises:
establishing an emergency power supply vehicle output constraint;
establishing topology constraint, system power flow constraint and system safety constraint of a power distribution network; the system security constraints include an operating voltage constraint and a branch capacity constraint;
and establishing operation constraints of the power distribution network, including distributed energy constraints and energy storage constraints.
8. The island division recovery method according to claim 7, wherein obtaining the road network side optimal emergency power supply vehicle moving path and the grid side maximized load recovery amount within the island coupling division range comprises:
based on the grid-side and highway-side objective functions and the corresponding constraint conditions, substituting the constraint conditions into the objective functions by using a large M method, and solving the objective functions;
and relaxing the operation constraint of the power distribution network and the topology constraint of the power distribution network by using a large M method so that the active power, reactive power and line current of the open branch are zero and the closed branch is unconstrained.
9. The island division recovery method of any one of claims 1-8 wherein,
the road network side traffic load level comprises a special load, a primary load, a secondary load and a tertiary load, wherein the special load and the primary load are important load nodes.
The step S1 further comprises the step of obtaining the capacity and the position information of the emergency power supply vehicle.
10. An island division recovery system that considers grid and highway network double-layer optimization, comprising:
the objective function establishing module M1 is used for collecting power grid side fault information and road network side road condition information and respectively establishing power grid side and road network side objective functions;
the island dividing module M2 is used for carrying out island coupling division on the power grid side and the highway network side based on the acquired power grid side fault information and highway network side road condition information to obtain an island coupling division range;
and the objective function solving module M3 is used for constructing constraint conditions corresponding to the objective function based on the island coupling dividing range, and obtaining the maximum load recovery quantity of the optimal emergency power supply vehicle moving path at the highway network side and the maximum load recovery quantity at the power grid side in the island coupling dividing range based on the objective function and the constraint conditions so as to recover power supply at the highway network side and the power grid side respectively.
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