CN109714077B - Medium-voltage distribution network carrier communication impedance matching method and system based on network looseness - Google Patents
Medium-voltage distribution network carrier communication impedance matching method and system based on network looseness Download PDFInfo
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Abstract
The invention discloses a medium-voltage distribution network carrier communication impedance matching method and system based on network looseness, wherein the method comprises the following steps: dividing a medium-voltage distribution network into a plurality of impedance matching intervals according to the network looseness of the trunk line; and performing optimal coordination matching on the impedance of each node in each impedance matching interval by adopting a particle swarm optimization algorithm. The medium-voltage distribution network carrier communication impedance matching method and system based on the network looseness solve the problems that the existing power line carrier communication impedance matching method can only improve the communication quality in a point-to-point mode and cannot achieve power coordination distribution among communication nodes in a carrier network with multiple communication nodes, can achieve power coordination distribution among the communication nodes in the carrier network with the multiple communication nodes, divides a complex medium-voltage distribution network into a plurality of impedance matching intervals, and adopts a particle swarm optimization algorithm to perform impedance matching, and the matching method is clear in principle and high in calculation speed.
Description
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to a medium-voltage distribution network carrier communication impedance matching method and system based on network looseness.
Background
The power line carrier communication is a technology for transmitting data or voice information by taking a power line as a medium, and the power line carrier communication utilizes an existing power distribution network as a communication channel, and has the advantages of natural network channel resources, low operating cost, low maintenance cost and the like. However, unlike other dedicated wired transmission media such as optical fiber and coaxial cable, the power line is not designed to achieve the communication objective, and the carrier channel characteristics thereof are related to factors such as the topology, line characteristics, and load conditions of the actual power grid. The characteristics of a communication channel of a carrier signal are complex and changeable due to the influence of various uncontrollable factors, and are difficult to predict, so that the signal is seriously attenuated in the transmission process, and the time and frequency selectivity is obvious. In the network transmission mode of one master and multiple slaves, the quality of signals received by multiple slave carrier machines is uneven, and the power coordination distribution among communication nodes must be considered, so that the problem of power imbalance that one receiving power margin is large and the other receiving power margin cannot be identified is avoided.
At present, most of the commonly used methods for impedance matching are single-node impedance matching, and the impedance matching methods are divided into two types: one is to obtain impedance matching parameters based on an intelligent algorithm, and the other is to realize impedance matching by designing a coupling circuit. The two methods have obvious effect in single-node matching, but only the injection and the reception of the carrier power of the communication node under single-node communication can be maximized, and the problem of power distribution among the slave carrier machines cannot be coordinated when the two methods are matched in a master-slave network mode, so that the application range has certain limitation. However, in the actual medium-voltage distribution network, a plurality of information transmission nodes exist, no wave trap is installed on a distribution line, and a carrier signal flows through the whole distribution line. Therefore, the adaptive impedance matching algorithm among multiple communication nodes in the network mode of the power line carrier communication system is a technical bottleneck for popularization and application of the PLC technology in the medium-voltage distribution network.
Disclosure of Invention
The invention aims to provide a medium-voltage distribution network carrier communication impedance matching method and system based on network looseness, solves the problems that the existing power line carrier communication impedance matching method can only improve the communication quality in a point-to-point mode and cannot realize power coordination distribution among communication nodes in a carrier network with multiple communication nodes, can realize power coordination distribution among the communication nodes in the carrier network with the multiple communication nodes, divides a complex medium-voltage distribution network into a plurality of impedance matching intervals, adopts a particle swarm optimization algorithm to carry out impedance matching, and has clear matching method principle and high calculation speed.
In order to achieve the purpose, the invention provides the following scheme:
a medium voltage distribution network carrier communication impedance matching method based on network looseness includes the steps:
dividing a medium-voltage distribution network into a plurality of impedance matching intervals according to the network looseness of the trunk line;
and performing optimal coordination matching on the impedance of each node in each impedance matching interval by adopting a particle swarm optimization algorithm.
Optionally, the network looseness of the trunk line represents a matching complexity of the i-node and the upstream network on the trunk line, and is denoted as WSiThe node looseness of all nodes of the upstream network of the i node represents the matching complexity of the i node and the adjacent i-1 node and is recorded as JSiIs the absolute value of the difference in reflection coefficients between adjacent nodes, WSiAs indicated by the general representation of the,
wherein i is the number of nodes, and i is an integer not less than 2.
Optionally, the dividing, according to the network looseness of the trunk line, the medium-voltage distribution network into a plurality of impedance matching intervals specifically includes:
step one, according to a formula
Obtaining the value of the network looseness of the trunk line;
step two, judging whether the value exceeds a set limit value or not;
if the impedance does not exceed the impedance matching range, dividing the i node and the upstream network into the same impedance matching range;
if the impedance is larger than the preset impedance, dividing the node i into a next impedance matching interval with the node i-1 as an interval demarcation point;
and step four, repeating the steps one to three, and dividing the medium-voltage distribution network into a plurality of impedance matching intervals, wherein a node between every two adjacent impedance matching intervals is a relay node.
Optionally, the performing optimal coordination matching on the impedance of each node in each impedance matching interval by using a particle swarm optimization algorithm specifically includes:
taking the relay node at the tail end of the impedance matching interval as an optimization target to ensure that the power transmission level of the relay node is maximum to be an objective function;
setting a receiving threshold value of each slave carrier machine in the impedance matching interval, and taking the receiving power of each slave carrier machine larger than the receiving threshold value as a constraint condition;
performing coordinated distribution on power among nodes in the impedance matching interval;
converting the equivalent internal resistance in the impedance matching interval subjected to coordinated distribution into corresponding node impedance;
and using the relay node at the tail end of the impedance matching interval as a signal source of the next impedance matching interval, recombining the network, and performing optimal coordination matching of the next impedance matching interval.
The invention also provides a medium-voltage distribution network carrier communication impedance matching system based on the network looseness, which is applied to the medium-voltage distribution network carrier communication impedance matching method based on the network looseness, and the system comprises:
the impedance matching interval dividing unit is used for dividing the medium-voltage distribution network into a plurality of impedance matching intervals according to the network looseness of the trunk line;
and the impedance coordination matching unit is used for performing optimal coordination matching on the impedance of each node in each impedance matching interval by adopting a particle swarm optimization algorithm.
Optionally, the impedance matching interval dividing unit includes a network looseness calculating unit, a network looseness judging unit, and an impedance matching interval dividing and determining unit, where the network looseness calculating unit is configured to obtain a value of the network looseness of the trunk line according to a formula, the network looseness judging unit is configured to judge whether the value exceeds a set limit value, and the impedance matching interval dividing and determining unit divides the impedance matching interval according to a judgment result of the network looseness judging unit.
Optionally, the impedance coordination matching unit includes a particle swarm optimization algorithm unit and an impedance matching unit, where the particle swarm optimization algorithm unit is configured to use a relay node at the end of the impedance matching interval as an optimization target to ensure that a power transmission level of the relay node is a maximum target function, set a receiving threshold of each slave carrier in the impedance matching interval, and perform coordination distribution on power among nodes in the impedance matching interval under a constraint condition that received power of each slave carrier is greater than the receiving threshold; and the impedance matching unit converts the equivalent internal resistance in the impedance matching interval which is distributed in a coordinated mode into corresponding node impedance.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a medium-voltage distribution network carrier communication impedance matching method and system based on network looseness, which solve the problems that the existing power line carrier communication impedance matching method can only improve the communication quality in a point-to-point mode and cannot realize power coordination distribution among communication nodes in a carrier network with multiple communication nodes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method for matching carrier communication impedance of a medium-voltage distribution network based on network looseness in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a medium-voltage distribution network carrier communication impedance matching system based on network looseness in an embodiment of the invention;
fig. 3 is a schematic diagram of a medium-voltage distribution network in a master-slave network mode according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the relationship between power transmission ratio and reflection coefficient according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a medium voltage distribution network before optimization matching according to an embodiment of the present invention;
fig. 6 is a power transmission curve of a medium voltage distribution network node before optimization matching according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a division structure of the impedance matching interval of the medium-voltage distribution network after optimized matching according to the embodiment of the invention;
fig. 8 is a power transmission curve after optimization of each node in the first impedance matching interval after optimization matching according to the embodiment of the present invention;
fig. 9 is a power transmission curve after optimization of each node in the second impedance matching interval after optimization matching according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a medium-voltage distribution network carrier communication impedance matching method and system based on network looseness, solves the problems that the existing power line carrier communication impedance matching method can only improve the communication quality in a point-to-point mode and cannot realize power coordination distribution among communication nodes in a carrier network with multiple communication nodes, can realize power coordination distribution among the communication nodes in the carrier network with the multiple communication nodes, divides a complex medium-voltage distribution network into a plurality of impedance matching intervals, adopts a particle swarm optimization algorithm to carry out impedance matching, and has clear matching method principle and high calculation speed.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flowchart of a method for matching carrier communication impedance of a medium-voltage distribution network based on network looseness in an embodiment of the present invention, and as shown in fig. 1, the method for matching carrier communication impedance of a medium-voltage distribution network based on network looseness provided by the present invention specifically includes the following steps:
and 102, performing optimal coordination matching on the impedance of each node in each impedance matching interval by adopting a particle swarm optimization algorithm.
In step 101, a concept of node looseness is introduced, the trunk line represents the matching complexity of the i node and the adjacent i-1 node and is recorded as JSiThe method is characterized in that the absolute value of the reflection coefficient difference between adjacent nodes is used, the size of the value reflects the matching complexity of an i node and an adjacent i-1 node, and a concept of 'network looseness' is additionally introduced, wherein the network looseness of a trunk line represents the accumulated value of the node looseness of all nodes of an upstream network of the i node and is recorded as WSiThe size of the value reflects the matching complexity of the inode and the upstream network,
JSias indicated by the general representation of the,
JSi＝|Γi-Γi-1| (i＝2、3、…n)
WSias indicated by the general representation of the,
wherein i is the number of nodes, i is an integer not less than 2, and ΓiIs the voltage reflection coefficient of node i;
step one, according to a formula
Obtaining the value of the network looseness of the trunk line;
step two, judging whether the value exceeds a set limit value or not;
if the impedance does not exceed the impedance matching range, dividing the i node and the upstream network into the same impedance matching range;
if the impedance is larger than the preset impedance, dividing the node i into a next impedance matching interval with the node i-1 as an interval demarcation point;
and step four, repeating the steps one to three, and dividing the medium-voltage distribution network into a plurality of impedance matching intervals, wherein a node between every two adjacent impedance matching intervals is a relay node.
Step 102 specifically includes:
step five, taking the relay node at the tail end of the impedance matching interval as an optimization target to ensure that the maximum power transmission level of the relay node is an objective function;
step six, setting a receiving threshold value of each slave carrier machine in the impedance matching interval, and taking the receiving power of each slave carrier machine larger than the receiving threshold value as a constraint condition;
step seven, performing coordination distribution on power among all nodes in the impedance matching interval;
step eight, converting the equivalent internal resistance in the impedance matching interval which is distributed in a coordinated manner into corresponding node impedance;
and step nine, using the relay node at the tail end of the impedance matching interval as a signal source of the next impedance matching interval, recombining the network, and performing optimal coordination matching of the next impedance matching interval.
Wherein the receiving threshold value is the lowest identifiable threshold value.
In an embodiment, fig. 3 is a schematic diagram of a medium voltage distribution network in a master-slave network mode according to an embodiment of the present invention, fig. 4 is a schematic diagram of a relationship between a power transmission ratio and a reflection coefficient according to an embodiment of the present invention, as shown in fig. 3, USIs the main carrier signal source voltage, ZSIs equivalent internal resistance, I, of main carrier and coupling equipmentSInputting the current of the distribution network for the source, PSInputting distribution network power for the information source; the thick solid lines each indicate a length of l1、l2The characteristic parameter is Zc1，γ1And Zc2，γ2The power transmission line of (1); line l1Head and tail end current is I11、I12The voltage of the head end and the tail end (nodes 1 and 2) is U1、U2(ii) a Line l2Head and tail end current is I21、I22The terminal (node 3) voltage is U3；ZT1、ZT2Respectively, the equivalent impedances of the connected distribution transformers, the currents flowing through the equivalent impedances are respectively IT1、IT2；ZPLC1、ZPLC2Respectively equivalent internal resistances of two slave carrier machines and coupling devices thereof, and the current flowing through the two slave carrier machines is IPLC1、IPLC2The received power is respectively PPLC1、PPLC2；ZeqIs the equivalent input impedance of the subsequent network of the node 3, and the current flowing through the equivalent input impedance is I31。
The power transfer ratio S from node 1 to node 2 in fig. 3 is:
the theory of power line transmission is as follows:
wherein, gamma isuIs the node voltage reflection coefficient, gammaIThe node current reflection coefficient is given by γ as the line propagation constant and l as the line length.
Voltage reflection coefficient Γ for easy viewinguFor power transmissionThe influence of the level S varies, the above formula is applied to gammauAnd (5) obtaining a derivative:
wherein a ═ e-2γlAnd a ∈ (0,1), ΓuE (-1, 1). Therefore, the following steps are carried out: gamma-shapedu>At 0, the function S decreases monotonically, Γu<At 0, the function S monotonically increases. Fig. 4 shows the functions S and Γ for a constant (a ═ 0.9)uThe relationship (2) of (c). From FIG. 4, | ΓuThe larger | is, the smaller S is, the larger the power attenuation between two nodes is, i.e. | ΓuL may indirectly reflect the magnitude of the power attenuation between two nodes.
From the above conclusion, the larger the difference between the linear parameters of two adjacent lines is, the larger the difference between the power attenuation of the two adjacent lines is, so that the voltage reflection coefficient modulus | Γ of the two line start-end node isuThe larger the difference is, that is, the larger the node looseness JS is, the larger the matching complexity between two adjacent nodes is, and the network looseness WS is the accumulation of the node looseness between every two adjacent nodes upstream of the current node, and represents the power coordination difficulty coefficient between the node and all the nodes upstream of the node. Therefore, use WSiTo determine the zone demarcation point (relay node) in the network if WSiIf the impedance is smaller than the specified limit value, dividing the i node and the upstream network into the same impedance matching interval; if WSiIf the impedance matching interval is larger than the specified limit value, the i node does not belong to the impedance matching interval of the upstream network, the i-1 node is set as a relay node, and the i node is divided into a second impedance matching interval taking the i-1 node as the relay node. By analogy, a large complex power distribution communication network is divided into a plurality of small impedance matching intervals.
Further, matching coordination is carried out in each impedance matching interval by using a particle swarm intelligent algorithm, the condition that the received power of the upstream slave carrier is larger than the recognizable minimum threshold value is taken as the constraint condition, the maximum received power of the downstream slave carrier is the target function, the impedance matching parameters of the slave carriers in the matching network are optimized, and the coordination distribution of the power among the communication nodes is completed.
Fig. 5 is a schematic diagram of a medium-voltage distribution network structure before optimization matching according to an embodiment of the present invention, under natural communication without impedance matching, the received power of each slave carrier is as shown in fig. 6, except for node 1 at the signal outlet, other nodes on the trunk have larger attenuation before optimization, and all exceed the signal identifiable minimum threshold, and the power attenuation of nodes 6 and 7 even exceed-60 dB, so that the signal cannot be identified; the optimization method is used for carrying out coordinated optimization, the network is divided into two impedance matching intervals shown in the figure 7, then the particle swarm optimization is adopted in each interval, the power received by the slave carrier in each interval is shown in the figures 8 and 9 after the optimization, the power transmission levels of all nodes are greatly improved through the division of the impedance matching intervals and the optimization inside the intervals, and the node power optimization effect is obvious.
The invention also provides a medium-voltage distribution network carrier communication impedance matching system based on the network looseness, which is applied to the medium-voltage distribution network carrier communication impedance matching method based on the network looseness, and the system comprises:
the impedance matching interval dividing unit is used for dividing the medium-voltage distribution network into a plurality of impedance matching intervals according to the network looseness of the trunk line;
and the impedance coordination matching unit is used for performing optimal coordination matching on the impedance of each node in each impedance matching interval by adopting a particle swarm optimization algorithm.
Optionally, the impedance matching interval dividing unit includes a network looseness calculating unit 201, a network looseness judging unit 202, and an impedance matching interval dividing and determining unit 203, where the network looseness calculating unit 201 is configured to obtain a value of network looseness of a trunk line according to a formula, the network looseness judging unit 202 is configured to judge whether the value exceeds a set limit value, and the impedance matching interval dividing and determining unit 203 divides the impedance matching interval according to a judgment result of the network looseness judging unit.
Optionally, the impedance coordination matching unit includes a particle swarm optimization algorithm unit 204 and an impedance matching unit 205, where the particle swarm optimization algorithm unit 204 is configured to use a relay node at the end of the impedance matching interval as an optimization target to ensure that the power transmission level of the relay node is maximum as an objective function, set a receiving threshold value of each slave carrier in the impedance matching interval, and perform coordination distribution on power among nodes in the impedance matching interval by using a constraint condition that the receiving power of each slave carrier is greater than the receiving threshold value; the impedance matching unit 205 converts the equivalent internal resistance within the impedance matching section that is coordinately allocated into a corresponding node impedance.
The invention provides a medium-voltage distribution network carrier communication impedance matching method and system based on network looseness, which solve the problems that the existing power line carrier communication impedance matching method can only improve the communication quality in a point-to-point mode and cannot realize power coordination distribution among communication nodes in a carrier network with multiple communication nodes.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A medium-voltage distribution network carrier communication impedance matching method based on network looseness is characterized by comprising the following steps:
dividing a medium-voltage distribution network into a plurality of impedance matching intervals according to the network looseness of the trunk line;
performing optimal coordination matching on the impedance of each node in each impedance matching interval by adopting a particle swarm optimization algorithm;
the network looseness of the trunk line represents the matching complexity of the i node and the upstream network on the trunk line and is recorded as WSi，WSiThe node looseness of all nodes of the upstream network of the i node represents the matching complexity of the i node and the adjacent i-1 node and is recorded as JSi，JSiIs the absolute value of the difference in reflection coefficients between adjacent nodes, WSiAs indicated by the general representation of the,
wherein i is the number of nodes, and i is an integer not less than 2.
2. The method for impedance matching of carrier communication of the medium-voltage distribution network based on the network looseness of claim 1, wherein the dividing of the medium-voltage distribution network into a plurality of impedance matching intervals according to the network looseness of the trunk line specifically comprises:
step one, according to a formula
Finding the network slack WS of the trunk lineiA value of (d);
step two, judge WSiWhether the value of (d) exceeds a set limit value;
if the impedance does not exceed the impedance matching range, dividing the i node and the upstream network into the same impedance matching range;
if the impedance is larger than the preset impedance, dividing the node i into a next impedance matching interval with the node i-1 as an interval demarcation point;
and step four, repeating the steps one to three, and dividing the medium-voltage distribution network into a plurality of impedance matching intervals, wherein a node between every two adjacent impedance matching intervals is a relay node.
3. The medium-voltage distribution network carrier communication impedance matching method based on the network looseness of claim 1, wherein the optimal coordination matching is performed on the impedance of each node in each impedance matching interval by adopting a particle swarm optimization algorithm, and specifically comprises the following steps:
taking the relay node at the tail end of the impedance matching interval as an optimization target to ensure that the power transmission level of the relay node is maximum to be an objective function;
setting a receiving threshold value of each slave carrier machine in the impedance matching interval, and taking the receiving power of each slave carrier machine larger than the receiving threshold value as a constraint condition;
performing coordinated distribution on power among nodes in the impedance matching interval;
converting the equivalent internal resistance in the impedance matching interval subjected to coordinated distribution into corresponding node impedance;
and using the relay node at the tail end of the impedance matching interval as a signal source of the next impedance matching interval, recombining the network, and performing optimal coordination matching of the next impedance matching interval.
4. A medium-voltage distribution network carrier communication impedance matching system based on network looseness is applied to the medium-voltage distribution network carrier communication impedance matching method based on the network looseness of any one of claims 1 to 3, and comprises the following steps:
the impedance matching interval dividing unit is used for dividing the medium-voltage distribution network into a plurality of impedance matching intervals according to the network looseness of the trunk line;
and the impedance coordination matching unit is used for performing optimal coordination matching on the impedance of each node in each impedance matching interval by adopting a particle swarm optimization algorithm.
5. The medium-voltage distribution network carrier communication impedance matching system based on the network looseness of claim 4, wherein the impedance matching section dividing unit comprises a network looseness calculating unit, a network looseness judging unit and an impedance matching section dividing and judging unit, the network looseness calculating unit is used for obtaining a value of the network looseness of a trunk line according to a formula, the network looseness judging unit is used for judging whether the value of the network looseness exceeds a set limit value, and the impedance matching section dividing and judging unit divides the impedance matching section according to a judgment result of the network looseness judging unit.
6. The medium voltage distribution network carrier communication impedance matching system based on the network looseness of claim 4, wherein the impedance coordination matching unit comprises a particle swarm optimization algorithm unit and an impedance matching unit, the particle swarm optimization algorithm unit is used for taking a relay node at the tail end of the impedance matching interval as an optimization target to ensure that the power transmission level of the relay node is maximum of a target function, setting a receiving threshold value of each slave carrier machine in the impedance matching interval, and carrying out coordination distribution on power among the nodes in the impedance matching interval by taking the receiving power of each slave carrier machine larger than the receiving threshold value as a constraint condition; and the impedance matching unit converts the equivalent internal resistance in the impedance matching interval which is distributed in a coordinated mode into corresponding node impedance.
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