CN111525578A - Distributed urban rail power supply system supporting power supply method for networked operation - Google Patents

Distributed urban rail power supply system supporting power supply method for networked operation Download PDF

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CN111525578A
CN111525578A CN202010395257.7A CN202010395257A CN111525578A CN 111525578 A CN111525578 A CN 111525578A CN 202010395257 A CN202010395257 A CN 202010395257A CN 111525578 A CN111525578 A CN 111525578A
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power supply
power
voltage
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潘卫国
曾力勇
谢文君
王俊
郭小敏
肖练
赵佳微
张乐萌
刘炜
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Tonghao Changsha Rail Traffic Control Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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Abstract

The invention discloses a network-operated distributed urban rail power supply system support power supply method, which specifically comprises the following steps: establishing a distributed urban rail power supply system topology model of networked operation; providing a networking support power supply mathematical model; and solving by adopting a hierarchical optimization method, firstly generating a candidate scheme set with the least switching operation times through topology search, and then finding out a feasible scheme with the least additional active power loss of the medium-voltage system through load flow calculation. The invention provides theoretical guidance for the selection of the networked support power supply scheme; meanwhile, the feasibility and the necessity of a networked support power supply mode under different fault conditions can be analyzed by the method provided by the invention.

Description

Distributed urban rail power supply system supporting power supply method for networked operation
Technical Field
The invention belongs to the field of urban rail power supply of networked operation, and particularly relates to a distributed urban rail power supply system supporting power supply method of networked operation.
Background
In recent years, subway network scales are continuously enlarged, and the characteristics of networked operation are presented. The power supply system as a subway power source spring is large in scale, but at present, a single line is still independently operated, and after a power supply switching station is withdrawn, other external power supplies of the line can be used for supporting power supply. Therefore, in order to improve the power supply flexibility and the power supply reliability of urban rail transit, interconnection switch lines are arranged among different line substations of the same transfer station, and the networked operation of a distributed urban rail power supply system is realized. In this construction, the external power supply of the adjacent line can be used to support the power supply until the normal power supply of the power-off region of the duplicate line is recovered.
There are constraints on the use of other external power sources to support power supply, such as spare capacity of the line-in power source for each circuit of the switching station, maximum current-carrying capacity of the medium-voltage cable, voltage on the medium-voltage bus side of each substation in the repartitioning power supply partition, and the like. Under different support power supply schemes, the switching operation times in the scheduling process may be different, and the active loss of the medium-voltage system after fault recovery has difference. Therefore, technical guidance is needed for selection of a networked support power supply scheme. Meanwhile, the feasibility and the necessity of a networked support power supply mode under different fault conditions need to be analyzed.
Disclosure of Invention
In order to solve the above problems, the present invention provides a distributed power supply method for urban rail system supporting power supply in networked operation.
The invention discloses a distributed urban rail power supply system supporting power supply method of networked operation, which is shown in figure 1 and comprises the following specific steps:
step 1: supposing that each transfer station can be provided with an overline connecting line, carrying out topological modeling on a distributed urban rail power supply system operated in a network mode according to a simplification principle, and estimating the spare capacity of each incoming line power supply.
Step 2: and simulating faults by using a topological model, determining a power-loss medium-voltage bus set, and estimating the sum of loads of a power-loss area.
And step 3: and generating a candidate scheme set meeting the operation mode constraint and the external power supply capacity constraint based on topology search with the aim of minimizing the switching operation times.
And 4, step 4: and (4) verifying whether each candidate scheme meets node voltage constraint and branch current constraint based on load flow calculation, if feasible schemes exist, solving the additional active loss of the medium-voltage system, and if not, returning to the step (3) to solve the candidate scheme set again.
And 5: and selecting a feasible scheme with minimum additional active loss of the medium-voltage system as an optimal support power supply scheme.
The simplifying principle of the topology model is as follows:
(1) the method comprises the following steps of (1) regarding a feed bus in an urban network transformer substation as a power supply node, regarding a medium-voltage bus in each section of the transformer substation as a load node, and dividing all nodes in a network into a power supply node set and a load node set;
(2) regarding a medium-voltage network power line and a bus sectionalizing switch line as edges;
(3) the power supply distance is supported to be influenced by equivalent impedance and susceptance parameters of the power line, and the line length is selected as the weight of the edge;
(4) the support power supply capability is limited by the capacity of the incoming power supply, and the power supply capacity and the load power are respectively selected as the power supply node and the load node.
On the premise of recovering all primary and secondary loads of a power loss area, the optimization target of supporting power supply is as follows:
(1) the number of switching operations is minimal:
fs＝minFs
in the formula, FsTo support the number of switching operations in the power failure recovery process.
(2) The medium-voltage system has minimum additional active loss:
Figure BDA0002487280880000021
in the formula (I), the compound is shown in the specification,
Figure BDA0002487280880000022
the active loss of the medium-voltage system after the power supply is supported during normal operation.
The constraint conditions for supporting power supply are as follows:
(1) node voltage constraint: within the power supply section supporting the repartition of the power supply, the voltage of the medium voltage bus of each substation should satisfy:
Umin≤Ul≤Umax
in the formula of Umax、UminRespectively, the upper limit and the lower limit of the voltage of the load node l.
(2) And (3) branch current constraint: in a power supply path between a switching station supporting power supply and each substation, the current flowing through each medium-voltage line should satisfy:
I(i,j)≤I(i,j)max
in the formula I(i,j)Is the current flowing in branch (I, j), I(i,j)maxThe maximum value of the current allowed for branch (i, j).
(3) External power supply capacity constraints: the capacity of each circuit incoming line power supply of the switching station for supporting power supply is required to satisfy the following conditions:
Figure BDA0002487280880000023
g∈NGs
in the formula, SgThe incoming line power supply capacity led out for the power supply node g; pl,T，Ql,TThe active power and the reactive power of a traction load directly connected with a load node l are obtained; pl,B，Ql,BThe active power and the reactive power of the step-down load directly connected with the load node l are obtained; n is a radical ofL,gA load node set for supplying power to a power supply node g; n is a radical ofGsPower supply node for supporting power supplyAnd (5) point collection.
(4) And (4) restricting the operation mode: the urban rail power supply system keeps 'open-loop operation', and each section of medium-voltage bus of the substation is powered by one incoming line power supply of the switching station.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the method provided by the invention simultaneously considers the scheduling rapidity and the operation economy, reduces the switching operation times and the additional loss of the medium-voltage system, and provides reference for the selection of the power supply scheme supported by the distributed urban rail power supply system under the condition that switching stations with different numbers and different positions exit.
2. The topological model established by the invention can simulate different fault conditions, and provides theoretical technical support for the implementation of networked operation engineering aiming at the feasibility and the necessity of analyzing the cross-line support power supply under different fault conditions by each transfer station.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of a road network power supply system of a certain subway part in the embodiment.
Fig. 3 is a partial topology diagram in the case of a fault of a subway power supply system in the embodiment.
Fig. 4 is a flowchart of a hierarchical optimization solution of the optimal support power supply scheme in the embodiment.
FIG. 5 is a schematic diagram of a partial medium voltage network of a subway power supply system in an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 2, which is a schematic diagram of a road network power supply system of a certain subway part, after each transfer station is provided with an overline interconnection switch circuit, a medium-voltage network is gradually changed into a grid structure with multiple lines connected from a single-line independent ring network structure. Therefore, a topological model of the distributed urban rail power supply system comprising n nodes and m lines is described by adopting a representation form of an n × n order adjacency matrix A and a 1 × n order weight matrix W.
Figure BDA0002487280880000031
In the formula, aijIs an element in A; dijIs the length of the medium voltage line between node i and node j.
Figure BDA0002487280880000032
In the formula, wiIs an element in W; siThe incoming line power supply capacity led out for the node i;
Figure BDA0002487280880000033
the traction load power and the step-down load power of the node i are directly connected respectively.
In addition, the operating state of each medium-voltage line is described by an n × n-order node correlation matrix B.
Figure BDA0002487280880000041
In the formula, bijIs an element in B.
Let Disg,lThe number of edges included in the power supply path between the power source node g and the load node l. Calculating the shortest path length between the nodes g and l according to the B by using a Floyd algorithm, namely Disg,l. According to all Disg,l(g∈NG,l∈NL) The power supply range of each circuit incoming line power supply of each switching station and the charged state of each section of medium-voltage bus of each substation can be determined under the current operation mode.
Referring to fig. 3, the partial topology diagram of the power supply system for a subway is shown, wherein the power supply system for a single power loss area is supported by adjacent external power sources1、L2、L3The target function with the least number of switch operations can be expressed as:
Figure BDA0002487280880000042
in the formula, FsThe number of switching operations; l is1For the power-off region and the adjacent power supply regionThe branch set where the inter-connection switch is located; l is2/L3Branch set of interconnection switch/interconnection feeder switch in power-off area αijAnd βijα for a 0-1 variable representing the state of the switchij1 means that the tie switch in branch (i, j) is closed and on the contrary remains open βijBy 1 is meant that the tie feeder switch in branch (i, j) is open and otherwise remains closed.
Referring to fig. 3, according to the simplified principle of the topology model, the additional active loss of the medium voltage system caused by the support power supply can be expressed as:
Figure BDA0002487280880000043
in the formula (I), the compound is shown in the specification,
Figure BDA0002487280880000044
active loss of a medium-voltage system after power supply is supported during normal operation;
Figure BDA0002487280880000045
active loss of a medium-voltage system in the power supply range of a power supply node g during normal operation and after power supply support; n is a radical ofG'、NG/NG' is a power supply node set with different and same power supply ranges under two conditions; the objective function for the minimum additional active loss of the medium-voltage system can be expressed as:
Figure BDA0002487280880000046
referring to fig. 4, which is a flowchart of a layered optimization solution of an optimal support power supply scheme, a topology model in a normal operation mode is represented by A, B, W, a topology model in a simulated fault condition is represented by a ', B', and W, and a power loss medium voltage bus set is NFThe set of live medium voltage buses is NEThe candidate set is MsThe specific steps in the stage 1 are as follows:
1) according to A ', B', NF、NEFinding L1、L2、L3All branches, number n1、n2、n3。
2) By T1、T2、T3Represents L1、L2、L3The action of corresponding switch in all branches makes T1 0＝[0,…,0]，
Figure BDA0002487280880000051
Figure BDA0002487280880000052
fs＝∞，k＝1。
3) Considering the convenience of dispatching, according to the principle that the interconnection switch/interconnection feeder switch between two substations simultaneously changes the state, from L12p (p is 1 … n)1/2) branches to be closed (i)1,j1)…(i2p,j2p)(i1…i2p∈NF,j1…j2p∈NE) Forming combinations, arranging all branch combinations from small to large according to p values, and arranging the same p value according to i1…i2pThe number of the power supply partitions is arranged from most to few.
4) ① i according to the arrangement sequence to judge whether each branch combination satisfies1≠…≠i2p② to j1…j2pThe sum of the standby capacity of the incoming line power supply of the power supply is larger than the sum of the loads of the power loss area, and the T is modified when the sum of the standby capacity of the incoming line power supply of the power supply is larger than the sum of the loads of the power loss area1 0Sequentially generating T1 1…T1 N。
5)T1 kHas a switching operation frequency of 2p and comprises T1 kIs set as the minimum number of switching operations of the switching operation combination
Figure BDA0002487280880000053
When ① p is equal to 1, the magnetic flux,
Figure BDA0002487280880000054
② p > 1, according to
Figure BDA0002487280880000055
Modify B', search i1…i2pSelecting a branch to be disconnected from the paths between adjacent power loss buses, and modifying
Figure BDA0002487280880000056
Solving for
Figure BDA0002487280880000057
Then go to 6), otherwise k ═ k +1, repeat 5).
6) In turn according to
Figure BDA0002487280880000058
The corresponding switch action combination modifies B', judges whether the external power supply capacity constraint is met, if no candidate scheme exists, MsUnchanged, return to 5) to solve again
Figure BDA0002487280880000059
Otherwise, update Ms，
Figure BDA00024872808800000510
k equals k +1, return 5).
The specific steps in the 2 nd stage are as follows:
1) calculating equivalent resistance, reactance and susceptance parameters of each medium-voltage line according to A, B, W, and solving through load flow calculation
Figure BDA00024872808800000511
2) According to M in turnsThe middle switch action combination modifies B', judges whether the voltage and the current are out of limit through load flow calculation, and solves the problem when the constraint is met
Figure BDA00024872808800000512
Calculating Δ PlossUpdate Ms'。
3)
Figure BDA00024872808800000513
Time, output Δ PlossThe scheme corresponding to the minimum value is returned to the 1 st stage to solve M againsAnd phase 2 is performed again.
Referring to fig. 5, the figure is a schematic diagram of a partial medium voltage network of a subway power supply system, and a topological model is used for simulating the fault condition that two adjacent switching stations exit simultaneously60-261＝∞，a61-262＝∞，a62-265＝∞，a63-266＝∞，b60-261＝0b61-262＝0，b62-265＝0，b63-266＝0。
And (4) generating two candidate schemes through the solution of the 1 st stage, wherein the minimum switching operation times is 8.
Scheme 1: the branch on which the tie switch to be closed is (259,257), (260,258), (261,125), (262,126), (261,263), (262,264) and the branch on which the tie feeder switch to be opened is (263,265), (264, 266).
Scheme 2: the branch on which the tie switch to be closed is (261,125), (262,126), (265,267), (266,268), (261,263), (262,264) and the branch on which the tie feeder switch to be opened is (259,261), (260, 262).
Through the solution in the stage 2, both the schemes 1 and 2 are feasible schemes, and the corresponding additional loss of the medium-voltage system is 204.9kW and 167.3kW respectively. Thus scheme 2 is a preferred scheme and scheme 1 is an alternative.
When the switching stations b and c are withdrawn simultaneously, the effect of the power supply supported by the switching station a and the adjacent switching station e is optimal, and a new power supply boundary point is arranged at the switching station b.
The invention firstly realizes the requirement of rapid dispatching by the minimum switch operation times, secondly ensures the function of economic operation by the minimum additional loss of the medium-voltage system, and rapidly provides the optimal supporting power supply scheme of a single power-off area under the fault condition that one or more switching station inlet line power supplies exit simultaneously, thereby providing reference for dispatching personnel. After the distributed urban rail power supply system is operated in a network mode, when one switching station exits, under most conditions that a transfer station substation is located in the center of a power loss area, additional active power loss of a medium-voltage system can be reduced through an overline supporting power supply mode. When two adjacent switching stations exit simultaneously, under most conditions that the power supply capacity of the local line support is insufficient, all primary and secondary loads in the power loss area can be recovered through the line-crossing support power supply mode.

Claims (4)

1. A distributed urban rail power supply system supporting power supply method of networked operation is characterized by comprising the following specific steps:
step 1: supposing that each transfer station can be provided with an overline connecting line, carrying out topological modeling on a distributed urban rail power supply system operated in a network mode according to a simplification principle, and estimating the spare capacity of each incoming line power supply;
step 2: simulating faults by using a topological model, determining a power-loss medium-voltage bus set, and estimating the sum of loads of a power-loss area;
and step 3: generating a candidate scheme set meeting the operation mode constraint and the external power supply capacity constraint based on topology search with the aim of minimizing the switching operation times;
and 4, step 4: checking whether each candidate scheme meets node voltage constraint and branch current constraint or not based on load flow calculation, if feasible schemes exist, solving the additional active loss of the medium-voltage system, and if not, returning to the step 3 to solve the candidate scheme set again;
and 5: and selecting a feasible scheme with minimum additional active loss of the medium-voltage system as an optimal support power supply scheme.
2. The method according to claim 1, wherein the topology model is simplified by the following principles:
(1) the method comprises the following steps of (1) regarding a feed bus in an urban network transformer substation as a power supply node, regarding a medium-voltage bus in each section of the transformer substation as a load node, and dividing all nodes in a network into a power supply node set and a load node set;
(2) regarding a medium-voltage network power line and a bus sectionalizing switch line as edges;
(3) the power supply distance is supported to be influenced by equivalent impedance and susceptance parameters of the power line, and the line length is selected as the weight of the edge;
(4) the support power supply capability is limited by the capacity of the incoming power supply, and the power supply capacity and the load power are respectively selected as the power supply node and the load node.
3. The method of claim 1, wherein the optimization goal of the power supply support is:
(1) the number of switching operations is minimal:
fs＝min Fs
in the formula, FsThe number of switching operations in the process of recovering from a power failure is supported;
(2) the medium-voltage system has minimum additional active loss:
Figure FDA0002487280870000011
in the formula (I), the compound is shown in the specification,
Figure FDA0002487280870000012
the active loss of the medium-voltage system after the power supply is supported during normal operation.
4. The method as claimed in claim 1, wherein the constraints of the power supply support are as follows:
(1) node voltage constraint: within the power supply section supporting the repartition of the power supply, the voltage of the medium voltage bus of each substation should satisfy:
Umin≤Ul≤Umax
in the formula of Umax、UminRespectively an upper limit and a lower limit of the voltage of the load node l;
(2) and (3) branch current constraint: in a power supply path between a switching station supporting power supply and each substation, the current flowing through each medium-voltage line should satisfy:
I(i,j)≤I(i,j)max
in the formula I(i,j)Is the current flowing in branch (I, j), I(i,j)maxMaximum current allowed for branch (i, j);
(3) external power supply capacity constraints: the capacity of each circuit incoming line power supply of the switching station for supporting power supply is required to satisfy the following conditions:
Figure FDA0002487280870000021
g∈NGs
in the formula, SgThe incoming line power supply capacity led out for the power supply node g; pl,T，Ql,TThe active power and the reactive power of a traction load directly connected with a load node l are obtained; pl,B，Ql,BThe active power and the reactive power of the step-down load directly connected with the load node l are obtained; n is a radical ofL,gA load node set for supplying power to a power supply node g; n is a radical ofGsA set of power nodes to support power;
(4) and (4) restricting the operation mode: the urban rail power supply system keeps 'open-loop operation', and each section of medium-voltage bus of the substation is powered by one incoming line power supply of the switching station.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102509153A (en) * 2011-11-03 2012-06-20 中国电力科学研究院 Method for reconstructing distribution network after fault
CN106410853A (en) * 2016-11-25 2017-02-15 中国科学院电工研究所 Power supply restoration method for distribution network with distributed power supply
CN107294086A (en) * 2017-06-22 2017-10-24 上海交通大学 The service restoration method realized based on network equivalent and parallelization
CN107658840A (en) * 2017-09-30 2018-02-02 山东科技大学 Distribution network failure restoration methods based on A* algorithms Yu fireworks algorithm

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102509153A (en) * 2011-11-03 2012-06-20 中国电力科学研究院 Method for reconstructing distribution network after fault
CN106410853A (en) * 2016-11-25 2017-02-15 中国科学院电工研究所 Power supply restoration method for distribution network with distributed power supply
CN107294086A (en) * 2017-06-22 2017-10-24 上海交通大学 The service restoration method realized based on network equivalent and parallelization
CN107658840A (en) * 2017-09-30 2018-02-02 山东科技大学 Distribution network failure restoration methods based on A* algorithms Yu fireworks algorithm

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