CN116341883B

CN116341883B - Resource coordination method and system for photovoltaic grid-connected switch

Info

Publication number: CN116341883B
Application number: CN202310626455.3A
Authority: CN
Inventors: 高建; 甄岩; 白晖峰; 霍超; 于华东; 张港红; 苑佳楠; 杨双双; 谢凡
Original assignee: State Grid Corp of China SGCC; Beijing Smartchip Microelectronics Technology Co Ltd
Current assignee: State Grid Corp of China SGCC; Beijing Smartchip Microelectronics Technology Co Ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2023-11-17
Anticipated expiration: 2043-05-31
Also published as: CN116341883A

Abstract

The invention provides a resource coordination method and system of a photovoltaic grid-connected switch, and belongs to the field of power systems. The resource coordination method of the photovoltaic grid-connected switch comprises the following steps: acquiring power information of a power generation unit in a power distribution network; controlling distributed photovoltaics in each cluster in the power distribution network based on the comprehensive absorption index in the cluster and the comprehensive absorption index among the clusters according to the power information of the power generation units in the power distribution network; each cluster in the power distribution network is obtained by dividing resources in the power distribution network by taking a photovoltaic grid-connected switch as a center. The full utilization of the distributed photovoltaic power generation resources is realized, so that the output of the distributed photovoltaic power generation can be coordinated more accurately and the distributed photovoltaic power generation can be fully consumed. The method realizes the organic integration of centralized and distributed control, has better robustness, expandability and flexibility, gets rid of the dependence on a central controller in the prior art, and is beneficial to reducing the control difficulty of large-scale distributed photovoltaic.

Description

Resource coordination method and system for photovoltaic grid-connected switch

Technical Field

The invention relates to the technical field of power systems, in particular to a resource coordination method of a photovoltaic grid-connected switch, a resource coordination system of the photovoltaic grid-connected switch, a resource coordination device of the photovoltaic grid-connected switch, a machine-readable storage medium and a processor.

Background

The continuous improvement of the distributed photovoltaic permeability enables the power distribution network to be changed into an active network from a traditional passive network, and due to fluctuation of photovoltaic output, change of power flow of a power distribution line and even reverse power flow occur, so that overheat overload of a distribution transformer can be caused, and rising and out-of-limit of branch voltage of the power distribution network can be caused.

In order to realize the optimization control targets of distributed photovoltaic balanced use, power coordination distribution and the like, the power generation units with relatively small single capacity and scattered installation positions are required to be subjected to orderly cooperative control, and the power fluctuation and voltage out-of-limit phenomena caused by inconsistent photovoltaic output curves and load curves are relieved. How to determine the output of the adjusting means such as distributed photovoltaic, flexible power supply and the like, and directly influence the consumption proportion of new energy and the quality of a final tide distribution scheme.

At present, distributed photovoltaic control is mainly distributed control, and the control mode is to take each distributed photovoltaic power generation unit as an intelligent agent, and realize cooperative control of all distributed energy storage units in the whole system by only exchanging a small amount of state information with a neighbor intelligent agent according to a certain control protocol. However, the voltage of each distributed photovoltaic power generation unit belongs to a local variable, and is influenced by line impedance, the voltages of different nodes are different, and the power is difficult to accurately realize optimal distribution.

Therefore, the existing distributed photovoltaic control has the problems that the coordination of the output of the distributed photovoltaic power generation is not accurate enough and cannot be fully absorbed.

Disclosure of Invention

The embodiment of the application aims to provide a resource coordination method of a photovoltaic grid-connected switch, a resource coordination system of the photovoltaic grid-connected switch, a resource coordination device of the photovoltaic grid-connected switch, a machine-readable storage medium and a processor.

In order to achieve the above object, a first aspect of the present application provides a resource coordination method of a photovoltaic grid-connected switch, including:

acquiring power information of a power generation unit in a power distribution network;

controlling distributed photovoltaics in each cluster in the power distribution network based on the comprehensive absorption index in the cluster and the comprehensive absorption index among the clusters according to the power information of the power generation units in the power distribution network;

each cluster in the power distribution network is obtained by dividing resources in the power distribution network by taking a photovoltaic grid-connected switch as a center.

In an embodiment of the present application, the controlling, according to the power information of the power generation units in the power distribution network, the distributed photovoltaic in each cluster in the power distribution network based on the intra-cluster comprehensive consumption index and the inter-cluster comprehensive consumption index includes:

Establishing a load factor evaluation index according to the power information of the power generation units in the power distribution network;

and controlling distributed photovoltaic in each cluster in the power distribution network based on the intra-cluster comprehensive absorption index, the inter-cluster comprehensive absorption index and the load rate evaluation index.

In the embodiment of the present application, the controlling the distributed photovoltaic in each cluster in the power distribution network based on the intra-cluster comprehensive absorption index, the inter-cluster comprehensive absorption index, and the load factor evaluation index includes:

based on the comprehensive absorption index and the load rate evaluation index in the clusters, regulating the voltage regulation proportion of the distributed photovoltaic in each cluster in the power distribution network to obtain a final voltage regulation proportion value so as to realize the control in the clusters;

and under the condition that each cluster in the power distribution network completes intra-cluster control, adjusting the power of each cluster in the power distribution network based on the inter-cluster comprehensive consumption index to obtain the final power value of each cluster so as to realize inter-cluster control.

In the embodiment of the application, the in-cluster comprehensive consumption index comprises a first power index and a second power index;

based on the comprehensive absorption index and the load factor evaluation index in the clusters, the voltage regulation proportion of the distributed photovoltaic in each cluster in the power distribution network is regulated to obtain a final voltage regulation proportion value, and the method comprises the following steps:

Adjusting the voltage adjustment proportion of the distributed photovoltaic in the cluster so that the load factor evaluation index meets a preset load factor threshold;

in the process of adjusting the voltage adjustment proportion of the distributed photovoltaic in the cluster, judging whether the power of the current cluster simultaneously meets the first power index and the second power index;

and under the condition that the power of the current cluster is determined to simultaneously meet the first power index and the second power index, obtaining a final voltage regulation proportion value.

In the embodiment of the application, the intra-cluster comprehensive digestion index is as follows:

，

wherein,is a comprehensive digestion index in the cluster, which is +.>For regulating the post-distributed photovoltaic +>Output voltage, < >>For regulating the ratio of the voltage, ">Is distributed photovoltaic->Output voltage at time t, < >>For the output load factor in the load factor evaluation index, < ->For the voltage status proportion in the load factor evaluation index, +.>For the first power indicator parameter, < >>Distributed photovoltaic for t period +.>Injection power to the system, +.>For the power consumption of the y-th load of period t,/, for the period t>Loss power for time period t branch l, +.>For the second power indicator parameter,/->Is distributed photovoltaic->Maximum generated power of (a).

In the embodiment of the application, the inter-cluster comprehensive consumption index comprises the power condition of each cluster;

The adjusting the power of each cluster in the power distribution network based on the inter-cluster comprehensive absorption index to obtain the final power value of each cluster comprises the following steps:

and adjusting the power of each cluster in the power distribution network according to the power condition of each cluster to obtain the power value of each final cluster.

In the embodiment of the application, the inter-cluster comprehensive digestion index is as follows:

，

wherein,is a comprehensive consumption index among clusters, and is +.>Representing the power situation of the respective clusters,/->Is->Power consumption of the y-th load of period t in the cluster,/->Is->Loss power of time period t branch l in cluster,/, for>Is->Distributed photovoltaic +.>Maximum power generation of>Is->The +.f. of period t in the cluster>Power consumption of individual loads, +.>Is->Time period t branch in cluster->Is/are>Is->Distributed photovoltaic +.>Maximum power generation of>Is the number of clusters.

In an embodiment of the present application, the resources in the power distribution network include a plurality of distributed photovoltaics and a plurality of loads;

the process for dividing the resources in the power distribution network comprises the following steps:

respectively taking each distributed photovoltaic and each load as a node, and calculating according to a preset connection relation formula between the nodes to obtain the connection relation between any nodes;

And dividing the distributed photovoltaics and the loads by taking the minimum connection relation among the nodes and the energy balance of the clusters as constraint conditions to obtain a plurality of clusters.

In the embodiment of the present application, the connection relation formula between the preset nodes is:

，/>，/>；

wherein:voltage sensitivity sets for the i-th node and the k-th node; />Represents the average value in the voltage sensitivity set of the ith node and the kth node, +.>Representing the maximum value in the voltage sensitivity set of the i-th node and the k-th node; />A set of voltage sensitivities for the jth node and the kth node; />Represents the average value in the voltage sensitivity set of the jth node and the kth node, +.>Represents the maximum value in the voltage sensitivity set of the jth node and the kth node, +.>For the correlation between node i and node k, < +.>For the correlation between node j and node k,for the connection relationship between node i and node j, N is the system nodePoints.

In the embodiment of the application, the expression of cluster energy balance is:

，

wherein:for the injection power of the t period upper power grid or other clusters to the present cluster, +.>Distributed photovoltaic for t period +.>Injection power to the system, +. >For the power consumption of the y-th load of period t,/, for the period t>Loss power for time period t branch l, +.>For the distributed photovoltaic quantity,/->For the number of loads>Is the number of branches.

The application provides a resource coordination system of a photovoltaic grid-connected switch, which is used for realizing the resource coordination method of the photovoltaic grid-connected switch, and comprises an intelligent terminal and a plurality of clusters which are obtained by dividing resources in a power distribution network by taking the photovoltaic grid-connected switch as a center, wherein each cluster comprises the photovoltaic grid-connected switch, and the photovoltaic grid-connected switch in each cluster is connected with the intelligent terminal;

the photovoltaic grid-connected switch is used for acquiring power information of a power generation unit in a power distribution network, and controlling distributed photovoltaic in each cluster in the power distribution network based on comprehensive absorption indexes in the clusters according to the power information of the power generation unit in the power distribution network;

the intelligent terminal is used for controlling distributed photovoltaic in each cluster in the power distribution network based on the inter-cluster comprehensive consumption index according to the power information of the power generation units in the power distribution network.

A third aspect of the present application provides a resource coordination device of a photovoltaic grid-connected switch, including:

The acquisition module is used for acquiring the power information of the power generation units in the power distribution network;

the control module is used for controlling distributed photovoltaics in each cluster in the power distribution network based on the comprehensive absorption index in the cluster and the comprehensive absorption index among the clusters according to the power information of the power generation units in the power distribution network; each cluster in the power distribution network is obtained by dividing resources in the power distribution network by taking a photovoltaic grid-connected switch as a center.

In an embodiment of the present application, the control module includes:

the index establishing unit is used for establishing a load rate evaluation index according to the power information of the power generating units in the power distribution network;

and the photovoltaic control unit is used for controlling the distributed photovoltaic in each cluster in the power distribution network based on the intra-cluster comprehensive absorption index, the inter-cluster comprehensive absorption index and the load factor evaluation index.

In an embodiment of the present application, the photovoltaic control unit includes:

the in-cluster control subunit is used for adjusting the voltage adjustment proportion of the distributed photovoltaic in each cluster in the power distribution network based on the in-cluster comprehensive absorption index and the load rate evaluation index to obtain a final voltage adjustment proportion value so as to realize in-cluster control;

And the inter-cluster control subunit is used for adjusting the power of each cluster in the power distribution network based on the inter-cluster comprehensive absorption index under the condition that each cluster in the power distribution network completes intra-cluster control, so as to obtain the power value of each final cluster to realize inter-cluster control.

In an embodiment of the present application, the resources in the power distribution network include a plurality of distributed photovoltaics and a plurality of loads; the apparatus further comprises:

the calculation module is used for taking each distributed photovoltaic and each load as a node respectively and calculating the connection relation between any nodes according to a preset connection relation formula between the nodes;

the dividing module is used for dividing the distributed photovoltaics and the loads by taking the minimum connection relation among the nodes and the energy balance of the clusters as constraint conditions to obtain a plurality of clusters.

A fourth aspect of the application provides a processor configured to perform the method of resource coordination of a photovoltaic grid-tie switch of any of the above.

A fifth aspect of the application provides a machine-readable storage medium having instructions stored thereon that, when executed by a processor, cause the processor to be configured to perform the method of resource coordination of a photovoltaic grid-tie switch of any of the above.

Through the technical scheme, resources in the power distribution network are divided into a plurality of clusters, comprehensive regulation and control between the clusters are realized based on comprehensive absorption indexes in the clusters and comprehensive absorption indexes between the clusters, the defect of single centralized or distributed type is effectively overcome, full utilization of distributed photovoltaic power generation resources is realized, and accordingly distributed photovoltaic power generation output and full absorption can be coordinated more accurately. The distributed control mode is preferentially adopted in the clusters, the centralized control mode is adopted among the clusters, a comprehensive consumption index control strategy is provided, voltage regulation power flow control based on the load rate is realized, and the effective consumption of the distributed photovoltaic is realized. The method realizes the organic integration of centralized control and distributed control, is a cooperative control mode integrating the advantages of centralized control and distributed control, has better robustness, expandability and flexibility, gets rid of the dependence on a central controller in the prior art, and is beneficial to reducing the control difficulty of large-scale distributed photovoltaics by clustered control. Meanwhile, a power flow control strategy of the power distribution network based on load rate and voltage regulation is provided, and the reliability of the system can be guaranteed on the premise of ensuring new energy consumption.

Additional features and advantages of embodiments of the application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the embodiments of the application. In the drawings:

fig. 1 schematically illustrates a flow chart of a resource coordination method of a photovoltaic grid-connected switch according to an embodiment of the present application;

FIG. 2 schematically illustrates a resource coordination system architecture diagram of a photovoltaic grid-tie switch according to an embodiment of the present application;

FIG. 3 schematically illustrates an intra-cluster control strategy block diagram according to an embodiment of the application;

FIG. 4 schematically illustrates an inter-cluster control strategy block diagram according to an embodiment of the application;

FIG. 5 schematically illustrates a block diagram of a resource coordination device of a photovoltaic grid-connected switch according to an embodiment of the present application;

fig. 6 schematically shows an internal structural view of an apparatus according to an embodiment of the present application.

Description of the reference numerals

410-an acquisition module; 420-a control module; a01-a processor; a02-a network interface; a03-an internal memory; a04-a display screen; a05-an input device; a06—a nonvolatile storage medium; b01-operating system; b02-computer program.

Detailed Description

The following describes the detailed implementation of the embodiments of the present application with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.

Referring to fig. 1 and 2, fig. 1 schematically illustrates a flow chart of a resource coordination method of a photovoltaic grid-connected switch according to an embodiment of the present application, and fig. 2 schematically illustrates a resource coordination system architecture diagram of a photovoltaic grid-connected switch according to an embodiment of the present application. The resource coordination method of the photovoltaic grid-connected switch comprises the following steps:

step 210: acquiring power information of a power generation unit in a power distribution network;

in this embodiment, the power generation unit in the power grid refers to distributed photovoltaic in the power grid, and the power information includes active power generated by the distributed photovoltaic in real time, output voltage, maximum power generation capacity of the photovoltaic, and threshold value of voltage of the photovoltaic grid-connected node. The acquisition can be obtained by taking the photovoltaic grid-connected switch as a basis to sense the control unit and acquiring information such as the distributed photovoltaic output condition, the load rate, the electric energy quality, the electricity load demand condition and the like in the cluster.

Step 220: controlling distributed photovoltaics in each cluster in the power distribution network based on the comprehensive absorption index in the cluster and the comprehensive absorption index among the clusters according to the power information of the power generation units in the power distribution network; each cluster in the power distribution network is obtained by dividing resources in the power distribution network by taking a photovoltaic grid-connected switch as a center.

In this embodiment, according to the capacity, the power generation capacity and the power load state of the distributed photovoltaic installed in the power distribution network cluster, the power distribution network cluster can be divided into clusters with different physical structures by taking the photovoltaic grid-connected switch as a center and according to the principle that the power generation capacity and the load deviation in the cluster are minimum, and each divided cluster comprises the photovoltaic grid-connected switch, the distributed photovoltaic and the load. It should be noted that the clusters may include one or more groups of photovoltaic grid-connected switches, distributed photovoltaic and loads. The distributed photovoltaic and the load are respectively connected with the photovoltaic grid-connected switch and are connected with a distribution transformer in the power distribution network through the photovoltaic grid-connected switch, the distribution transformer is connected to the intelligent terminal, and each distributed photovoltaic grid-connected switch and the intelligent terminal can communicate in a power line high-speed carrier or wireless communication mode.

In some embodiments, the resources in the power distribution network include a plurality of distributed photovoltaics and a plurality of loads; in order to divide the clusters more reasonably, a spatial distribution algorithm of voltage correlation can be adopted for dividing, namely each distributed photovoltaic and load are used as nodes, and an electrical distance matrix among the nodes is obtained according to the correlation relation of the voltages among the nodes. The specific process for dividing the resources in the power distribution network comprises the following steps:

firstly, respectively taking each distributed photovoltaic and each load as nodes, and calculating according to a preset connection relation formula between the nodes to obtain the connection relation between any nodes;

the connection relation formula between the preset nodes is as follows:

，/>，/>；

wherein:voltage sensitivity sets for the i-th node and the k-th node; />Represents the average value in the voltage sensitivity set of the ith node and the kth node, +.>Representing the maximum value in the voltage sensitivity set of the i-th node and the k-th node; />A set of voltage sensitivities for the jth node and the kth node; />Represents the average value in the voltage sensitivity set of the jth node and the kth node, +.>Represents the maximum value in the voltage sensitivity set of the jth node and the kth node, +. >For the correlation between node i and node k, < +.>For the correlation between node j and node k,the connection relation between the node i and the node j is that N is the number of system nodes.

And then dividing the distributed photovoltaics and the loads by taking the minimum connection relation among the nodes and the energy balance of the clusters as constraint conditions to obtain a plurality of clusters.

Wherein the cluster energy balance may be expressed as:

，

wherein:for the injection power of the t period upper power grid or other clusters to the present cluster, +.>Distributed photovoltaic for t period +.>Injection power to the system, +.>For the power consumption of the y-th load of period t,/, for the period t>Loss power for time period t branch l, +.>For the distributed photovoltaic quantity,/->For the number of loads>Is the number of branches.

In this embodiment, according to the principle that the power generation capacity and the load deviation in the cluster are minimum, that is, the principle that the connection relation between the selected nodes is minimum, the cluster division is performed according to the topology structure of the power distribution network based on the principle of local energy balance. In the specific implementation, the method can be that firstly, the physical structure clusters are obtained by dividing according to the principle that the power generation capacity and the load deviation in the clusters are minimum, then whether the obtained physical structure clusters meet the formula of the cluster energy balance is judged, if yes, the current dividing result is adopted, and otherwise, the current dividing result is adjusted until the cluster energy balance is met.

In the implementation process, each distributed photovoltaic and load are used as nodes by adopting a spatial distribution algorithm of voltage correlation, and the nodes are divided according to the correlation relation of the voltages among the nodes and cluster energy balance, so that the power generation capacity and the load deviation in the clusters obtained by the division are minimized, and meanwhile, the cluster energy balance is met, so that the obtained clusters are more reasonable, and the accuracy of resource coordination is improved.

In some embodiments, for a certain power balance problem, the output combinations of different adjustment modes are very many, and the output combinations directly influence the result of tide distribution, so that the absorption rate of the photovoltaic power generation of the system is influenced. In order to provide an optimal control strategy, an evaluation index of the load rate can be established first, and voltage regulation in and among clusters can be performed by combining the power loads, so that the power flow of the power distribution network can be controlled. The method specifically comprises the following steps:

firstly, establishing a load factor evaluation index according to power information of a power generation unit in the power distribution network;

and then, controlling distributed photovoltaics in each cluster in the power distribution network based on the comprehensive absorption indexes in the clusters, the comprehensive absorption indexes among the clusters and the load rate evaluation indexes.

In this embodiment, the load factor evaluation index refers to a load factor evaluation index of each cluster, and the load factor evaluation index of the cluster establishment may be a load factor of the power generation unit establishment, and is expressed by adopting a ratio of output load factor to voltage state, and is respectively recorded asAnd->Wherein->，/>Active power for distributed photovoltaic real-time generation, < >>For distributed photovoltaic output voltage, +.>For the maximum power generation capacity of distributed photovoltaic, < ->The threshold value of the voltage of the photovoltaic grid-connected node is more limited.

In some embodiments, after the load rate evaluation index is established, intra-cluster and inter-cluster regulation may be further performed, referring to fig. 3 to fig. 4, fig. 3 schematically illustrates an intra-cluster control policy block diagram according to an embodiment of the present application, and fig. 4 schematically illustrates an inter-cluster control policy block diagram according to an embodiment of the present application. The method specifically comprises the following steps:

firstly, adjusting voltage adjustment proportion of distributed photovoltaic in each cluster in the power distribution network based on comprehensive absorption indexes and the load factor evaluation indexes in the clusters to obtain a final voltage adjustment proportion value so as to realize intra-cluster control;

in some embodiments, the intra-cluster integrated consumption indicator includes a first power indicator and a second power indicator; the process for obtaining the final voltage regulation proportion value comprises the following steps:

The method comprises the steps of firstly, adjusting the voltage adjustment proportion of distributed photovoltaics in a cluster so that the load factor evaluation index meets a preset load factor threshold;

step two, judging whether the power of the current cluster meets the first power index and the second power index simultaneously in the process of adjusting the voltage adjustment proportion of the distributed photovoltaic in the cluster;

and thirdly, under the condition that the power of the current cluster is determined to simultaneously meet the first power index and the second power index, obtaining a final voltage regulation proportion value.

Wherein, the comprehensive digestion index in the cluster is as follows:

，

In this embodiment, the regulation and control in the cluster is realized by adjusting the node voltage of the distributed photovoltaic grid-connected point under the condition of considering the load factor evaluation index, specifically, the voltage regulation proportion is adjusted, that is, in the formula. The specific regulation process is that the voltage regulation proportion is regulated, and the regulation is judged to be +.>Judging whether the two are all less than or equal to 1 at the same timeWhether the power is the smallest in the adjusting process or not, namely, the first power index is met; judgingAnd if the voltage is the largest in the regulation process, namely the second power index is met, and under the condition that the first power index and the second power index are simultaneously met, a final voltage regulation proportion value is obtained, so that the resource regulation and control in the cluster are realized.

It should be noted that, in the above formulaA default value can be preset, the adjusting process is the adjustment +.>Until the first power indicator and the second power indicator are met.

And then, under the condition that each cluster in the power distribution network completes intra-cluster control, adjusting the power of each cluster in the power distribution network based on the inter-cluster comprehensive consumption index to obtain the power value of each final cluster so as to realize inter-cluster control.

In some embodiments, the inter-cluster integrated consumption index includes power conditions of the respective clusters;

The adjusting the power of each cluster in the power distribution network based on the inter-cluster comprehensive absorption index to obtain the final power value of each cluster comprises the following steps: and adjusting the power of each cluster in the power distribution network according to the power condition of each cluster to obtain the power value of each final cluster.

Wherein, the inter-cluster comprehensive consumption index is:

，

In this embodiment, after each cluster in the power distribution network completes intra-cluster control, the current power situation of each cluster may be obtained, where the power situation refers to a power gap or a residual quantity of the cluster, specifically, whether the sum of the consumed power and the network loss power of the load is greater than the maximum generated power is determined, if so, it is indicated that the cluster has the power gap, otherwise, it is indicated that the cluster has the residual quantity. When the regulation and control between clusters are carried out, the power of the clusters with the surplus can be input to the clusters with the power gaps, so that the balance between the clusters is realized. Specifically, during regulation and control, the regulation and control can be performed according to the sizes of the residual quantity and the power gap, namely, two clusters with the residual quantity similar to the power gap are regulated and controlled; the adjustment and control can also be performed according to the distance between actual clusters, for example, for a cluster with a power gap, the cluster with the rest quantity nearest to the cluster is selected for adjustment and control; the method can also be that regulation and control clusters are set for each cluster in advance, and when the clusters need to be regulated and controlled, the clusters meeting the requirements are selected from the set regulation and control clusters to be regulated and controlled. It should be noted that, the foregoing several regulation and control manners are only illustrative, and the present embodiment may further include other manners of regulating the power of each cluster in the power distribution network according to the power condition of each cluster, which are all within the protection scope of the present embodiment.

In the implementation process, the distributed photovoltaic in each cluster in the power distribution network is controlled based on the intra-cluster comprehensive absorption index and the inter-cluster comprehensive absorption index according to the power information of the power generation units in the power distribution network by acquiring the power information of the power generation units in the power distribution network; each cluster in the power distribution network is obtained by dividing resources in the power distribution network by taking a photovoltaic grid-connected switch as a center. The resources in the power distribution network are divided into a plurality of clusters, the comprehensive regulation and control between the clusters are realized based on the comprehensive absorption indexes in the clusters and the comprehensive absorption indexes among the clusters, the defect of single centralized or distributed type is effectively overcome, the full utilization of the distributed photovoltaic power generation resources is realized, and the output and the full absorption of the distributed photovoltaic power generation can be coordinated more accurately. The distributed control mode is preferentially adopted in the clusters, the centralized control mode is adopted among the clusters, a comprehensive consumption index control strategy is provided, voltage regulation power flow control based on the load rate is realized, and the effective consumption of the distributed photovoltaic is realized. The method realizes the organic integration of centralized control and distributed control, is a cooperative control mode integrating the advantages of centralized control and distributed control, has better robustness, expandability and flexibility, gets rid of the dependence on a central controller in the prior art, and is beneficial to reducing the control difficulty of large-scale distributed photovoltaics by clustered control. Meanwhile, a power flow control strategy of the power distribution network based on load rate and voltage regulation is provided, and the reliability of the system can be guaranteed on the premise of ensuring new energy consumption.

Fig. 1 is a flow chart of a method for resource coordination of a photovoltaic grid-connected switch in one embodiment. It should be understood that, although the steps in the flowchart of fig. 1 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of other steps or sub-steps of other steps.

Referring to fig. 2, the present embodiment provides a resource coordination system of a photovoltaic grid-connected switch, which is configured to implement the above-mentioned resource coordination method of a photovoltaic grid-connected switch, and includes an intelligent terminal and a plurality of clusters obtained by dividing resources in a power distribution network with the photovoltaic grid-connected switch as a center, where each cluster includes the photovoltaic grid-connected switch, and the photovoltaic grid-connected switch in each cluster is connected with the intelligent terminal;

In the embodiment, the photovoltaic grid-connected switch is used as a distributed control unit in the cluster, and the distributed photovoltaic output condition, the load rate, the electric energy quality and the electricity load requirement condition in the cluster are analyzed and collected to realize balanced autonomy in the cluster. Meanwhile, each distributed photovoltaic grid-connected switch and the intelligent terminal communicate in a power line high-speed carrier or wireless communication mode, and the intelligent terminal coordinates resource balance conditions of each cluster to regulate and control energy among the clusters. The resource coordination in the clusters and among the clusters adopts a voltage regulation control strategy based on the load rate, so that the optimal power flow of the active power distribution network is realized. The resources in the power distribution network are divided into a plurality of clusters, the comprehensive regulation and control between the clusters are realized based on the comprehensive absorption indexes in the clusters and the comprehensive absorption indexes among the clusters, the defect of single centralized or distributed type is effectively overcome, the full utilization of the distributed photovoltaic power generation resources is realized, and the output and the full absorption of the distributed photovoltaic power generation can be coordinated more accurately. The system architecture of the organic integration of the centralized and distributed control based on the photovoltaic grid-connected switch is realized, and the layering and the partition are highly autonomous. The photovoltaic grid-connected switch is used as a basis to sense the control unit, the intelligent terminal is used as a system architecture of the overall control unit at the edge side, the organic integration of centralized and distributed control is realized, and the photovoltaic grid-connected switch is a cooperative control mode integrating the advantages of the centralized and distributed control, and has good robustness, expandability and flexibility.

Referring to fig. 5, fig. 5 schematically illustrates a block diagram of a resource coordination device of a photovoltaic grid-connected switch according to an embodiment of the present application. The embodiment provides a resource coordination device of a photovoltaic grid-connected switch, which comprises an acquisition module 410 and a control module 420, wherein:

an acquisition module 410, configured to acquire power information of a power generation unit in a power distribution network;

the control module 420 is configured to control distributed photovoltaic in each cluster in the power distribution network based on an intra-cluster comprehensive consumption index and an inter-cluster comprehensive consumption index according to power information of the power generation units in the power distribution network; each cluster in the power distribution network is obtained by dividing resources in the power distribution network by taking a photovoltaic grid-connected switch as a center.

Wherein the control module 420 includes:

Wherein, the photovoltaic control unit includes:

Wherein the resources in the power distribution network comprise a plurality of distributed photovoltaics and a plurality of loads; the apparatus further comprises:

In the implementation process, the acquiring module 410 acquires the power information of the power generation units in the power distribution network, and the control module 420 controls the distributed photovoltaics in each cluster in the power distribution network based on the comprehensive absorption index in the cluster and the comprehensive absorption index between clusters according to the power information of the power generation units in the power distribution network; each cluster in the power distribution network is obtained by dividing resources in the power distribution network by taking a photovoltaic grid-connected switch as a center. The resources in the power distribution network are divided into a plurality of clusters, the comprehensive regulation and control between the clusters are realized based on the comprehensive absorption indexes in the clusters and the comprehensive absorption indexes among the clusters, the defect of single centralized or distributed type is effectively overcome, the full utilization of the distributed photovoltaic power generation resources is realized, and the output and the full absorption of the distributed photovoltaic power generation can be coordinated more accurately. The distributed control mode is preferentially adopted in the clusters, the centralized control mode is adopted among the clusters, a comprehensive consumption index control strategy is provided, voltage regulation power flow control based on the load rate is realized, and the effective consumption of the distributed photovoltaic is realized. The method realizes the organic integration of centralized control and distributed control, is a cooperative control mode integrating the advantages of centralized control and distributed control, has better robustness, expandability and flexibility, gets rid of the dependence on a central controller in the prior art, and is beneficial to reducing the control difficulty of large-scale distributed photovoltaics by clustered control. Meanwhile, a power flow control strategy of the power distribution network based on load rate and voltage regulation is provided, and the reliability of the system can be guaranteed on the premise of ensuring new energy consumption.

The resource coordination device of the photovoltaic grid-connected switch comprises a processor and a memory, wherein the acquisition module 410, the control module 420 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The kernel can be provided with one or more, and the full utilization of the distributed photovoltaic power generation resources can be realized by adjusting the kernel parameters, so that the output of the distributed photovoltaic power generation can be coordinated more accurately and the distributed photovoltaic power generation can be fully consumed.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a storage medium, and a program is stored on the storage medium, and when the program is executed by a processor, the resource coordination method of the photovoltaic grid-connected switch is realized.

The embodiment of the invention provides a processor which is used for running a program, wherein the resource coordination method of a photovoltaic grid-connected switch is executed when the program runs.

In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 6. The computer apparatus includes a processor a01, a network interface a02, a display screen a04, an input device a05, and a memory (not shown in the figure) which are connected through a system bus. Wherein the processor a01 of the computer device is adapted to provide computing and control capabilities. The memory of the computer device includes an internal memory a03 and a nonvolatile storage medium a06. The nonvolatile storage medium a06 stores an operating system B01 and a computer program B02. The internal memory a03 provides an environment for the operation of the operating system B01 and the computer program B02 in the nonvolatile storage medium a06. The network interface a02 of the computer device is used for communication with an external terminal through a network connection. The computer program, when executed by the processor a01, implements a method for resource coordination of a photovoltaic grid-connected switch. The display screen a04 of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device a05 of the computer device may be a touch layer covered on the display screen, or may be a key, a track ball or a touch pad arranged on a casing of the computer device, or may be an external keyboard, a touch pad or a mouse.

It will be appreciated by those skilled in the art that the structure shown in FIG. 6 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.

In one embodiment, the resource coordination device of the photovoltaic grid-connected switch provided by the application can be implemented as a form of a computer program, and the computer program can be run on a computer device as shown in fig. 6. The memory of the computer device may store various program modules that make up the resource coordination device of the photovoltaic grid-tie switch, such as the acquisition module 410 and the control module 420 shown in fig. 5. The computer program comprising the respective program modules causes the processor to execute the steps in the resource coordination method of the photovoltaic grid-connected switch according to the embodiments of the present application described in the present specification.

The computer device shown in fig. 6 may execute step 210 by the acquisition module 410 and step 220 by the control module 420 in the resource coordination device of the photovoltaic grid-connected switch shown in fig. 5.

The embodiment of the application provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes the following steps when executing the program:

In one embodiment, the controlling the distributed photovoltaic in each cluster in the power distribution network based on the intra-cluster comprehensive consumption index and the inter-cluster comprehensive consumption index according to the power information of the power generation units in the power distribution network includes:

In one embodiment, the controlling the distributed photovoltaic in each cluster in the power distribution network based on the intra-cluster integrated consumption index, the inter-cluster integrated consumption index, and the load factor evaluation index includes:

In one embodiment, the intra-cluster integrated consumption indicator includes a first power indicator and a second power indicator;

In one embodiment, the intra-cluster integrated consumption index is:

，

wherein,is a comprehensive digestion index in the cluster, which is +.>For regulating the post-distributed photovoltaic +>Output voltage, < >>For regulating the ratio of the voltage, ">Is distributed photovoltaic->Output voltage at time t, < >>For the output load factor in the load factor evaluation index, < ->For the voltage status proportion in the load factor evaluation index, +.>For the first power indicator parameter, < >>Distributed photovoltaic for t period +.>Injection power to the system, +.>For the power consumption of the y-th load of period t,/, for the period t>Loss power for time period t branch l, +.>For the second power indicator parameter,/->Is distributed photovoltaic->Maximum generated power of (a). />

In one embodiment, the inter-cluster integrated consumption index includes power conditions of each cluster;

In one embodiment, the inter-cluster comprehensive consumption index is:

，

In one embodiment, the resources in the power distribution network include a plurality of distributed photovoltaics and a plurality of loads;

In one embodiment, the connection relation formula between the preset nodes is:

，/>，/>；

Wherein:voltage sensitivity sets for the i-th node and the k-th node; />Represents the average value in the voltage sensitivity set of the ith node and the kth node, +.>Representing the maximum value in the voltage sensitivity set of the i-th node and the k-th node; />A set of voltage sensitivities for the jth node and the kth node; />Represents the average value in the voltage sensitivity set of the jth node and the kth node, +.>Represents the maximum value in the voltage sensitivity set of the jth node and the kth node, +.>For the correlation between node i and node k, < +.>For the correlation between node j and node k,the connection relation between the node i and the node j is that N is the number of system nodes.

In one embodiment, the expression of cluster energy balance is:

，

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.

Claims

1. The resource coordination method of the photovoltaic grid-connected switch is characterized by comprising the following steps of:

under the condition that each cluster in the power distribution network completes intra-cluster control, adjusting the power of each cluster in the power distribution network based on an inter-cluster comprehensive consumption index to obtain the power value of each final cluster so as to realize inter-cluster control;

each cluster in the power distribution network is obtained by dividing resources in the power distribution network by taking a photovoltaic grid-connected switch as a center;

the comprehensive absorption indexes in the cluster comprise a first power index and a second power index; based on the comprehensive absorption index and the load factor evaluation index in the clusters, the voltage regulation proportion of the distributed photovoltaic in each cluster in the power distribution network is regulated to obtain a final voltage regulation proportion value, and the method comprises the following steps:

Under the condition that the power of the current cluster is determined to simultaneously meet the first power index and the second power index, a final voltage regulation proportion value is obtained;

wherein the inter-cluster comprehensive consumption index comprises the power condition of each cluster; the adjusting the power of each cluster in the power distribution network based on the inter-cluster comprehensive absorption index to obtain the final power value of each cluster comprises the following steps:

obtaining the power condition of each cluster by judging whether the sum of the consumed power and the network loss power of the load is larger than the maximum power generation power, wherein the power condition of each cluster refers to a power gap or surplus of the cluster;

and inputting the power of the cluster with the surplus to the cluster with the power gap to obtain the power value of each cluster finally.

2. The resource coordination method of a photovoltaic grid-connected switch according to claim 1, wherein the intra-cluster comprehensive consumption index is:

，

wherein,is a comprehensive digestion index in the cluster, which is +.>To adjustPost-distributed photovoltaic->Output voltage, < >>For regulating the ratio of the voltage, ">Is distributed photovoltaic->Output voltage at time t, < >>For the output load factor in the load factor evaluation index,for the voltage status proportion in the load factor evaluation index, +. >For the first power indicator parameter, < >>Distributed photovoltaic for period tInjection power to the system, +.>For the power consumption of the y-th load of period t,/, for the period t>Loss power for time period t branch l, +.>For the second power indicator parameter,/->Is distributed photovoltaic->Maximum generated power of (a).

3. The resource coordination method of a photovoltaic grid-connected switch according to claim 1, wherein the inter-cluster comprehensive consumption index is:

，

4. The method of resource coordination of a photovoltaic grid-tie switch of claim 1, wherein the resources in the power distribution grid comprise a plurality of distributed photovoltaics and a plurality of loads;

5. The method for coordinating resources of a photovoltaic grid-connected switch according to claim 4, wherein the connection relation formula between the preset nodes is:

，/>，/>；

wherein:voltage sensitivity sets for the i-th node and the k-th node; />Represents the average value in the voltage sensitivity set of the ith node and the kth node, +.>Representing the maximum value in the voltage sensitivity set of the i-th node and the k-th node; />A set of voltage sensitivities for the jth node and the kth node; />Represents the average value in the voltage sensitivity set of the jth node and the kth node, +.>Represents the maximum value in the voltage sensitivity set of the jth node and the kth node, +.>For the correlation between node i and node k, < +.>For the correlation between node j and node k, +.>The connection relation between the node i and the node j is that N is the number of system nodes.

6. The method for resource coordination of a photovoltaic grid-connected switch according to claim 4, wherein the expression of cluster energy balance is:

，

wherein:for the injection power of the t period upper power grid or other clusters to the present cluster, +.>Distributed photovoltaic for t period +.>Injection power to the system, +.>For the power consumption of the y-th load of period t,/, for the period t>Loss power for time period t branch l，For the distributed photovoltaic quantity,/->For the number of loads>Is the number of branches.

7. A resource coordination system of a photovoltaic grid-connected switch, for implementing a resource coordination method of a photovoltaic grid-connected switch according to any one of claims 1 to 6, which is characterized by comprising an intelligent terminal and a plurality of clusters obtained by dividing resources in a power distribution network by taking the photovoltaic grid-connected switch as a center, wherein each cluster comprises the photovoltaic grid-connected switch, and the photovoltaic grid-connected switch in each cluster is connected with the intelligent terminal;

the photovoltaic grid-connected switch is used for acquiring power information of a power generation unit in a power distribution network, and controlling distributed photovoltaic in each cluster in the power distribution network based on comprehensive absorption indexes in the clusters according to the power information of the power generation unit in the power distribution network; comprising the following steps: establishing a load factor evaluation index according to the power information of the power generation units in the power distribution network; controlling distributed photovoltaic in each cluster in the power distribution network based on the intra-cluster comprehensive absorption index, the inter-cluster comprehensive absorption index and the load rate evaluation index;

8. A resource coordination device of a photovoltaic grid-connected switch, comprising:

the control module is used for controlling distributed photovoltaics in each cluster in the power distribution network based on the comprehensive absorption index in the cluster and the comprehensive absorption index among the clusters according to the power information of the power generation units in the power distribution network; wherein each cluster in the power distribution network is obtained by dividing resources in the power distribution network by taking a photovoltaic grid-connected switch as a center

Wherein, the control module includes:

the photovoltaic control unit is used for controlling distributed photovoltaic in each cluster in the power distribution network based on the intra-cluster comprehensive absorption index, the inter-cluster comprehensive absorption index and the load factor evaluation index;

wherein, the photovoltaic control unit includes:

The in-cluster control subunit is used for adjusting the voltage adjustment proportion of the distributed photovoltaic in each cluster in the power distribution network based on the in-cluster comprehensive absorption index and the load rate evaluation index to obtain a final voltage adjustment proportion value so as to realize in-cluster control; the comprehensive absorption index in the cluster comprises a first power index and a second power index; comprising the following steps: adjusting the voltage adjustment proportion of the distributed photovoltaic in the cluster so that the load factor evaluation index meets a preset load factor threshold; in the process of adjusting the voltage adjustment proportion of the distributed photovoltaic in the cluster, judging whether the power of the current cluster simultaneously meets the first power index and the second power index; under the condition that the power of the current cluster is determined to simultaneously meet the first power index and the second power index, a final voltage regulation proportion value is obtained;

the inter-cluster control subunit is used for adjusting the power of each cluster in the power distribution network based on the inter-cluster comprehensive absorption index under the condition that each cluster in the power distribution network completes intra-cluster control, so as to obtain the power value of each final cluster to realize inter-cluster control; the inter-cluster comprehensive consumption index comprises the power condition of each cluster; comprising the following steps: obtaining the power condition of each cluster by judging whether the sum of the consumed power and the network loss power of the load is larger than the maximum power generation power, wherein the power condition of each cluster refers to a power gap or surplus of the cluster; and inputting the power of the cluster with the surplus to the cluster with the power gap to obtain the power value of each cluster finally.

9. The resource coordination device of a photovoltaic grid-tie switch of claim 8, wherein the resources in the power distribution network comprise a plurality of distributed photovoltaics and a plurality of loads; the apparatus further comprises:

10. A processor configured to perform the method of resource coordination of a photovoltaic grid-tie switch according to any one of claims 1 to 6.

11. A machine-readable storage medium having instructions stored thereon, which when executed by a processor cause the processor to be configured to perform the resource coordination method of a photovoltaic grid-tie switch according to any of claims 1 to 6.