Distributed resource management and control decision-making method, system and device and medium

Abstract

The invention belongs to the field of power distribution network operation management and control, and discloses a distributed resource management and control decision-making method, system and device and a medium, and the method comprises the steps: classifying all types of distributed resources in a power distribution network; determining a distributed resource access control task based on a distributed resource access control target criterion; based on a distributed resource access management and control criterion under the voltage out-of-limit problem, determining a distributed resource access management and control decision of the voltage out-of-limit problem; determining a distributed resource access management and control decision of the harmonic distortion problem according to a distributed resource access management and control criterion under the harmonic distortion problem; and based on a distributed resource access control criterion under the composite power quality problem, determining a distributed resource access control execution decision of the composite power quality problem. According to the invention, flexible and rapid management and control of complex requirements of different electric energy quality problems are realized.

Description

Technical Field

[0001] The present invention relates to the field of distribution network operation control, and in particular to a distributed resource control decision-making method, system, equipment and medium. Background Art

[0002] With the rapid development of multiple types of flexible resources such as photovoltaic, energy storage, and flexible loads in the distribution system, large-scale distributed resources are widely connected to the distribution area. However, the distributed photovoltaic output and load power consumption have random characteristics, which can easily cause large fluctuations in the voltage in the distribution area, resulting in problems such as voltage exceeding the limit. At the same time, large-scale distributed resources need to rely on power electronic equipment to access the distribution area, and a large number of harmonics will be generated during their operation, causing the risk of harmonics exceeding the standard. At present, the types of distributed resources in the distribution area are diverse and large in scale, and the power quality problems are prominent, and it is urgent to control multiple types of power quality problems. Due to the flexible and controllable characteristics of distributed resources such as photovoltaic, energy storage, and flexible loads, access control of the above distributed resources makes it possible to improve the power quality in the distribution area.

[0003] The dispatching and control mode of the existing distribution substations is still relatively traditional. The control and decision-making plans for different types of equipment are mainly carried out and implemented based on on-site experience, lacking targeted guidance for different types of power quality issues. At present, the power quality issues in distribution substations are mainly addressed in a unified manner for single issues. For the situation where voltage exceeds the limit and harmonics exceed the standard at the same time, the possibility of directly coordinating and handling different types of problems is not considered, which not only causes a waste of regulation resources, but also easily leads to problems such as difficulty in coordinating the operation of different types of distributed resources and inability to simultaneously manage multiple types of power quality issues. With the construction of new power systems, the demand for high-quality power supply in distribution substations continues to increase. However, due to the relatively single control measures for power quality issues, it is difficult to tap the potential for large-scale distributed resource regulation, which will cause problems such as long response time for power quality decision-making and poor control effect, which seriously restricts the development and construction of new power systems.

[0004] Therefore, how to provide a distributed resource management and control decision-making method, system, device and medium is a problem that needs to be solved urgently. Summary of the invention

[0005] The embodiments of the present invention provide a distributed resource management and control decision-making method, system, device and medium to solve the problems of long power quality problem decision response time and poor control effect in the prior art.

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be a general review, nor is it intended to identify key / important components or to delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0007] According to a first aspect of an embodiment of the present invention, a distributed resource management and control decision method is provided.

[0008] In one embodiment, the distributed resource management and control decision method includes:

[0009] According to the type information of the grid-connected distributed resources in the distribution network, classify the various types of distributed resources in the distribution network; based on the frequency voltage data information of the grid-connected points in the distribution network, combined with the distributed resource access control target judgment criteria, determine the distributed resource access control tasks;

[0010] Based on the voltage over-limit problem information of the distribution station area and the corresponding control tasks, the distributed resource access control decision under the voltage over-limit problem is determined according to the distributed resource access control criteria under the voltage over-limit problem;

[0011] According to the harmonic distortion problem information of the distribution network area and the corresponding control tasks, combined with the distributed resource access control criteria under the harmonic distortion problem, the distributed resource access control decision of the harmonic distortion problem is determined;

[0012] Based on the voltage over-limit and harmonic distortion problem information of the distribution network substation and the corresponding control tasks, the distributed resource access control execution decision of the complex power quality problem is determined according to the distributed resource access control criteria under the complex power quality problem.

[0013] In one embodiment, the categories of distributed resources in the distribution network include distributed photovoltaic resources, energy storage resources, cut-off power electronic load resources, non-cut-off power electronic load resources, cut-off ordinary load resources and non-cut-off ordinary load resources.

[0014] In one embodiment, the expression of the distributed resource access control target criterion is:

[0015]

[0016] Where: k i is the power quality control task of the grid connection point i in the distribution station area; K1 is a single control task for voltage exceeding the upper limit; K2 is a composite control task for voltage exceeding the upper limit and harmonic distortion exceeding the limit; K3 is a single control task for voltage exceeding the lower limit; K4 is a composite control task for voltage exceeding the lower limit and harmonic distortion exceeding the limit; K5 is a single control task for harmonic distortion exceeding the limit; K6 means that this distribution station area currently does not need power quality control; Vi is the voltage amplitude of the distribution station area and grid connection point i; V max is the maximum limit of voltage amplitude in the distribution network; V min is the minimum limit of voltage amplitude in the distribution network; THD V,i Total harmonic distortion rate of voltage at the grid connection point i in the distribution station area; The maximum limit of the total harmonic distortion rate of the voltage at the grid connection point i in the distribution station area.

[0017] In one embodiment, the distributed resource access control tasks include a single control task for voltage exceeding an upper limit, a compound control task for voltage exceeding an upper limit and harmonic distortion exceeding a limit, a single control task for voltage exceeding a lower limit, a compound control task for voltage exceeding a lower limit and harmonic distortion exceeding a limit, and a single control task for harmonic distortion exceeding a limit.

[0018] In one embodiment, when the control task is a single control task for voltage exceeding an upper limit and a single control task for voltage exceeding a lower limit, a distributed resource access control decision for voltage exceeding limit problem is determined;

[0019] When the control task is a single control task of harmonic distortion exceeding the limit, determine the distributed resource access control decision of the harmonic distortion problem;

[0020] When the control task is a composite control task of voltage exceeding the upper limit and harmonic distortion exceeding the limit and a composite control task of voltage exceeding the lower limit and harmonic distortion exceeding the limit, the distributed resource access control execution decision of the composite power quality problem is determined.

[0021] In one embodiment, the distributed resource access control decision for the harmonic distortion problem is determined based on the harmonic distortion problem information of the distribution network area connection point and the corresponding control task, combined with the distributed resource access control criterion under the harmonic distortion problem, including:

[0022] According to the power data information collected from the distribution network area connection point, the non-fundamental frequency power flow direction of the distribution network area connection point is judged and its classification is determined;

[0023] Based on the classified non-fundamental frequency power flow matching corresponding control tasks, decision analysis is performed on energy storage resources and power electronic load resources respectively to determine the distributed resource access control decision for harmonic distortion problems.

[0024] In one embodiment, the classification expression of the non-baseband power flow direction is:

[0025]

[0026] Where, d i is the non-baseband power flow direction of the distribution network area grid point i; D1 is the non-baseband power flow from the distribution network area grid point i from the distributed resources to the distribution network; D2 is the non-baseband power flow from the distribution network to the distributed resources at the distribution network area grid point i; Pi N It is the non-fundamental frequency power flowing to the distribution network from the distribution station area connection point i.

[0027] According to a second aspect of an embodiment of the present invention, a distributed resource management and control decision system is provided.

[0028] In one embodiment, the distributed resource management and control decision system includes:

[0029] The distributed resource management and control task determination module is used to classify various types of distributed resources in the distribution network according to the type information of the grid-connected distributed resources in the distribution station area; based on the frequency and voltage data information of the grid-connected points in the distribution station area, combined with the distributed resource access management and control target judgment criteria, the distributed resource access management and control tasks are determined;

[0030] The voltage over-limit problem control module is used to determine the distributed resource access control decision for the voltage over-limit problem based on the voltage over-limit problem information of the distribution station area and the corresponding control tasks, according to the distributed resource access control criteria under the voltage over-limit problem;

[0031] The harmonic distortion problem control module is used to determine the distributed resource access control decision for the harmonic distortion problem based on the harmonic distortion problem information of the distribution network area and the corresponding control tasks, combined with the distributed resource access control criteria under the harmonic distortion problem;

[0032] The composite power quality problem control module is used to determine the execution decision of distributed resource access control under composite power quality problems based on the voltage over-limit and harmonic distortion problem information of the distribution network substation and grid connection point and the corresponding control tasks, and according to the distributed resource access control criteria under composite power quality problems.

[0033] In one embodiment, the categories of distributed resources in the distribution network include distributed photovoltaic resources, energy storage resources, cut-off power electronic load resources, non-cut-off power electronic load resources, cut-off ordinary load resources and non-cut-off ordinary load resources.

[0034] In one embodiment, the expression of the distributed resource access control target criterion is:

[0035]

[0036] Where: k i is the power quality control task of the grid connection point i in the distribution station area; K1 is a single control task for voltage exceeding the upper limit; K2 is a composite control task for voltage exceeding the upper limit and harmonic distortion exceeding the limit; K3 is a single control task for voltage exceeding the lower limit; K4 is a composite control task for voltage exceeding the lower limit and harmonic distortion exceeding the limit; K5 is a single control task for harmonic distortion exceeding the limit; K6 means that this distribution station area currently does not need power quality control; Vi is the voltage amplitude of the distribution station area and grid connection point i; V max is the maximum limit of voltage amplitude in the distribution network; V min is the minimum limit of voltage amplitude in the distribution network; THD V,i Total harmonic distortion rate of voltage at the grid connection point i in the distribution station area; The maximum limit of the total harmonic distortion rate of the voltage at the grid connection point i in the distribution station area.

[0037] In one embodiment, the distributed resource access control tasks include a single control task for voltage exceeding an upper limit, a compound control task for voltage exceeding an upper limit and harmonic distortion exceeding a limit, a single control task for voltage exceeding a lower limit, a compound control task for voltage exceeding a lower limit and harmonic distortion exceeding a limit, and a single control task for harmonic distortion exceeding a limit.

[0038] In one embodiment, when the control task is a single control task for voltage exceeding an upper limit and a single control task for voltage exceeding a lower limit, a distributed resource access control decision for voltage exceeding limit problem is determined;

[0039] When the control task is a single control task of harmonic distortion exceeding the limit, determine the distributed resource access control decision of the harmonic distortion problem;

[0040] When the control task is a composite control task of voltage exceeding the upper limit and harmonic distortion exceeding the limit and a composite control task of voltage exceeding the lower limit and harmonic distortion exceeding the limit, the distributed resource access control execution decision of the composite power quality problem is determined.

[0041] In one embodiment, the harmonic distortion problem control module determines the distributed resource access control decision for the harmonic distortion problem based on the harmonic distortion problem information of the distribution network substation and the corresponding control tasks, combined with the distributed resource access control criteria under the harmonic distortion problem. According to the power data information collected by the distribution network substation, the non-fundamental frequency power flow direction of the distribution network substation is judged and classified; the corresponding control tasks are matched based on the classified non-fundamental frequency power flow direction, and decision analysis is performed on the energy storage resources and power electronic load resources respectively to determine the distributed resource access control decision for the harmonic distortion problem.

[0042] In one embodiment, the classification expression of the non-baseband power flow direction is:

[0043]

[0044] Where, d i is the non-baseband power flow direction of the distribution network area grid point i; D1 is the non-baseband power flow from the distribution network area grid point i from the distributed resources to the distribution network; D2 is the non-baseband power flow from the distribution network to the distributed resources at the distribution network area grid point i; P i NIt is the non-fundamental frequency power flowing to the distribution network from the distribution station area connection point i.

[0045] According to a third aspect of an embodiment of the present invention, a computer device is provided.

[0046] In one embodiment, the computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0047] According to a fourth aspect of embodiments of the present invention, a computer-readable storage medium is provided.

[0048] In one embodiment, the computer-readable storage medium stores a computer program, and the computer program implements the steps of the above method when executed by a processor.

[0049] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0050] (1) The present invention establishes a distributed resource management and control system for different types of power quality problems. In order to solve the problem of reduced power quality level of the distribution system under large-scale access of distributed resources, the present invention comprehensively considers the differentiated characteristics of voltage over-limit, harmonic over-limit and their combined problems, and realizes flexible and rapid management and control of complex needs of different power quality problems.

[0051] (2) The present invention is aimed at the large-scale development trend of photovoltaic, energy storage and flexible load in distribution substations. By finely distinguishing the controllable and adjustable capabilities of different types of resources such as photovoltaic, energy storage and load, the present invention fully taps the regulation potential of large-scale, multi-type and distributed resources. Under the premise of ensuring the qualified power quality in the distribution substation area, the distributed resources are maximized.

[0052] (3) The present invention sets target criteria for different power quality issues, combines the improvement capabilities of different distributed resources for multiple types of power quality issues, efficiently and flexibly allocates the distributed resource adjustment capabilities, effectively guarantees the operating capabilities and efficiency of photovoltaic, energy storage and other resources, and at the same time achieves targeted and precise control of power quality issues in the distribution system.

[0053] (4) The present invention proposes management and control decisions and methods for different forms of distributed resources and different types of power quality problems in distribution substations. Through comprehensive analysis and comprehensive evaluation of power quality problems, the management and control tasks of multiple types of distributed resources are clarified. The current operating status of the distribution substation is timely determined through the monitoring data information of the distribution substation, and then the management and control tasks are adjusted in real time, thereby realizing dynamic response and efficient control of complex power quality problems in the distribution system, and solving the difficult problems of different types of distributed resources being difficult to coordinate operation and multiple types of power quality problems being unable to be managed simultaneously during the process of improving the power quality of the distribution system. The method proposed in the present invention has a wide range of application and can be applied to the field of power systems to improve the orderly access of massive distributed resources in distribution substations in power systems and the efficiency and scientificity of scheduling decisions.

[0054] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0056] Figure 1 is a flow chart of a distributed resource management and control decision method according to an exemplary embodiment;

[0057] Figure 2 is a structural block diagram of a distributed resource management and control decision system according to an exemplary embodiment;

[0058] Figure 3 is a structural schematic diagram of a computer device according to an exemplary embodiment;

[0059] Figure 4 is a schematic diagram showing a principle of a distributed resource management and control decision method according to an exemplary embodiment;

[0060] Figure 5 It is a schematic diagram of a distributed resource access control target criterion in a distributed resource control decision method according to an exemplary embodiment;

[0061] Figure 6 is a schematic diagram of distributed resource control priority for a voltage exceeding an upper limit problem in a distributed resource control decision method according to an exemplary embodiment;

[0062] Figure 7 is a schematic diagram of distributed resource control priority for a voltage exceeding a lower limit problem in a distributed resource control decision method according to an exemplary embodiment;

[0063] Figure 8It is a schematic diagram of distributed resource control priorities for a harmonic distortion problem in a distributed resource control decision method according to an exemplary embodiment. DETAILED DESCRIPTION

[0064] The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0065] The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. in this document indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of this document, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, it can also be the internal communication of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0066] As used herein, the term "plurality" means two or more than two, unless otherwise specified.

[0067] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0068] In this article, the term "and / or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and / or B means: A or B, or, A and B.

[0069] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0070] Each module in the device or system of the present application can be implemented in whole or in part by software, hardware, or a combination thereof. The above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above modules.

[0071] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0072] Figure 1 An embodiment of a distributed resource management and control decision method of the present invention is shown.

[0073] In this optional embodiment, the distributed resource management and control decision method includes:

[0074] Step S101: classify various types of distributed resources in the distribution network according to the type information of the grid-connected distributed resources in the distribution network; determine the distributed resource access control task based on the frequency voltage data information of the grid-connected points in the distribution network and the distributed resource access control target criterion;

[0075] Step S103: Based on the voltage over-limit problem information of the distribution station area and the corresponding control tasks, according to the distributed resource access control criteria under the voltage over-limit problem, determine the distributed resource access control decision under the voltage over-limit problem;

[0076] Step S105: Determine the distributed resource access control decision for the harmonic distortion problem based on the harmonic distortion problem information of the distribution network area connection point and the corresponding control task, combined with the distributed resource access control criterion under the harmonic distortion problem;

[0077] Step S107: Based on the voltage over-limit and harmonic distortion problem information of the distribution network area connection point and the corresponding control tasks, and according to the distributed resource access control criteria under the composite power quality problem, determine the distributed resource access control execution decision for the composite power quality problem.

[0078] Figure 2 An embodiment of the distributed resource management and control decision system of the present invention is shown.

[0079] In this optional embodiment, the distributed resource management and control decision system includes:

[0080] The distributed resource management and control task determination module 201 is used to classify various types of distributed resources in the distribution network according to the type information of the grid-connected distributed resources in the distribution network area; based on the frequency and voltage data information of the grid-connected points in the distribution network area, combined with the distributed resource access management and control target criterion, determine the distributed resource access management and control tasks;

[0081] The voltage over-limit problem control module 203 is used to determine the distributed resource access control decision for the voltage over-limit problem based on the voltage over-limit problem information of the distribution station area and the corresponding control task, according to the distributed resource access control criterion under the voltage over-limit problem;

[0082] The harmonic distortion problem control module 205 is used to determine the distributed resource access control decision of the harmonic distortion problem according to the harmonic distortion problem information of the distribution network area and the corresponding control tasks, combined with the distributed resource access control criteria under the harmonic distortion problem;

[0083] The composite power quality problem control module 207 is used to determine the execution decision of the distributed resource access control of the composite power quality problem based on the voltage over-limit and harmonic distortion problem information of the distribution network area connection point and the corresponding control tasks, according to the distributed resource access control criteria under the composite power quality problem.

[0084] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are further described below from the perspective of architecture and principle, as follows:

[0085] The first aspect of the present invention provides a distributed resource management and control decision method for improving power quality in a distribution station area (such as Figure 4 As shown in the figure, it has established a distributed resource management and control system for different types of power quality problems, explored the regulation potential of distributed resources and their ability to improve power quality problems, and achieved dynamic response and efficient control of complex power quality problems in the distribution system.

[0086] A distributed resource management and control decision method for improving power quality in a distribution station area, comprising:

[0087] 1. According to the type information of various types of distributed resources connected to the grid in the distribution substation area, various types of distributed resources in the distribution network are classified into three categories: distributed photovoltaic equipment, energy storage equipment, and power load. In order to improve the efficiency of distributed resource access control in the distribution substation area, the distributed resource classification criteria are proposed as follows:

[0088] 1) When the grid-connected equipment is a photovoltaic device, this equipment belongs to distributed photovoltaic resources;

[0089] 2) When the grid-connected device is an energy storage device, then this device is an energy storage resource;

[0090] 3) When the grid-connected device is a power electronic load device, if the conditions shown in formula (1) are met, then this device belongs to a cut-off power electronic load resource; if the conditions shown in formula (1) are not met, then this device belongs to a non-cut-off power electronic load resource;

[0091] (4) When the grid-connected device is a non-power electronic load device, if the conditions shown in formula (2) are met, then this device belongs to a cut-off common load resource; if the conditions shown in formula (2) are not met, then this device belongs to a non-cut-off common load resource.

[0092] α PE,CF >P i PE,CF / P i PE (1)

[0093] α NM,CF >P i NM,CF / P i NM (2)

[0094] Where: α PE,CF is the power electronic load cut-off judgment coefficient, P i PE,CF is the power value of the disconnectable load in the grid-connected power electronic load at the grid-connected point i in the substation area; P i PE is the power value of the grid-connected power electronic load at the grid-connected point i in the substation area; α NM,CF is the cut-off judgment coefficient of non-power electronic load, P i NM,CF P is the power value of the disconnectable load among the non-power electronic loads connected to the grid at the grid connection point i in the substation area; i NM It is the power value of the grid-connected non-power electronic load at the grid-connected point i in the substation.

[0095] 2. According to the voltage data information of each frequency collected from the distribution station area and the grid connection point, and based on the distributed resource access control target judgment criteria, the distributed resource access control task is determined by making each judgment time interval the same as the time interval for issuing the control command.

[0096] Based on the collected voltage data information of each frequency of the distribution station area and the grid connection point, the task judgment is made according to the distributed resource access control target criterion, such as Figure 5 As shown in the figure, the specific control target criteria are set as follows:

[0097]

[0098] Where: k i is the power quality control task of the grid-connected point i in the substation; K1 is a single control task for voltage exceeding the upper limit; K2 is a composite control task for voltage exceeding the upper limit and harmonic distortion exceeding the limit; K3 is a single control task for voltage exceeding the lower limit; K4 is a composite control task for voltage exceeding the lower limit and harmonic distortion exceeding the limit; K5 is a single control task for harmonic distortion exceeding the limit; K6 means that this substation currently does not need power quality control; V i is the voltage amplitude of the grid connection point i in the substation area; V max is the maximum limit of voltage amplitude in the distribution network; V min is the minimum limit of voltage amplitude in the distribution network; THD V,i The total harmonic distortion rate of the voltage at the grid connection point i in the substation area; The maximum limit of the total harmonic distortion rate of the voltage at the grid-connected point i in the substation.

[0099] When the control tasks are K1 and K3, step S3 is used to determine the control execution decision; when the control task is K5, step S4 is used to determine the control execution decision; when the control task is K2 and K4, step S5 is used to determine the control execution decision.

[0100] 3. According to the voltage over-limit problem information and control tasks of the distribution station area connection point, and based on the distributed resource access control criteria under the voltage over-limit problem, the distributed resource access control decision under the voltage over-limit problem is obtained.

[0101] 1) When the control task of the area is K1, a decision is made to disconnect the distributed photovoltaic resources. Then the control target criterion in step 2 is used for judgment. If the control task of the area grid-connected point is K6, the distributed resource control of this area grid-connected point is completed; if the control task of the area grid-connected point is still K1, a decision is made to disconnect the energy storage resources discharged at this time to complete the distributed resource control of this area, such as Figure 6 shown.

[0102] 2) When the control task of the substation is K3, a decision is made to disconnect the energy storage resources being charged at this time. Then use the control target criterion in step 2 to make a judgment. If the control task of the substation grid point is K6, the distributed resource control of this substation grid point is completed; if the control task of the substation grid point is still K3, a decision is made to disconnect the ordinary load resources that can be disconnected. Then use the control target criterion in step 2 to make a judgment. If the control task of the substation grid point is still K3, a decision is made to disconnect the power electronic load resources that can be disconnected, and the distributed resource control of this substation is completed. Figure 7 shown.

[0103] 4. According to the harmonic distortion problem information and control tasks of the distribution network substation area connection point, and based on the distributed resource access control criteria under the harmonic distortion problem, the distributed resource access control decision of the harmonic distortion problem is obtained.

[0104] Based on the power data information collected by the distribution station area grid connection point, the non-baseband power flow direction of the area grid connection point i is judged and its classification is determined, such as Figure 8 As shown, the classification is as follows:

[0105]

[0106] Where, d i is the non-base frequency power flow direction of the grid-connected point i in the substation area; D1 is the non-base frequency power flow from the grid-connected point i in the substation area from the distributed resources to the distribution network; D2 is the non-base frequency power flow from the grid-connected point i in the substation area from the distribution network to the distributed resources; P i N is the non-fundamental frequency power flowing from the grid connection point i to the distribution network.

[0107] When the control task of the substation is K5 and the non-baseband power flow direction is D1, a decision is made to disconnect the distributed photovoltaic resources. Then, using the control target criterion in step 2 and the non-baseband power flow criterion in step 4, if the control task of the substation is K6, the distributed resource control of this substation is completed; if the control task of the substation after the decision is K5 and the non-baseband power flow direction is D1, a decision is made to disconnect the energy storage resources discharged at this time. The distributed resource control of this substation is completed.

[0108] When the control task of the substation is K5 and the non-baseband power flow direction is D2, a decision is made to disconnect the energy storage resources being charged at this time. Then, using the control target criterion in step 2 and the non-baseband power flow criterion in step 4, if the control task of the substation is K6, the distributed resource control of this substation is completed; if the control task of the substation after the decision is K5 and the non-baseband power flow direction is D2, a decision is made to disconnect the power electronic load resources that can be disconnected. The distributed resource control of this substation is completed.

[0109] 5. According to the voltage over-limit and harmonic distortion problem information and control tasks of the distribution station area grid connection point, and based on the distributed resource access control criteria under complex power quality problems, obtain the distributed resource access control execution decision under complex power quality problems.

[0110] 1) When the control task of the substation is K2, first use step 1) in step 3 to make a voltage over-limit control decision. Then use step 4 to make a harmonic distortion control decision to complete the distributed resource control under the composite power quality problem of this substation.

[0111] 2) When the control task of the substation is K4, first use step 2) in step 3 to make a voltage over-limit control decision. Then use step 4 to make a harmonic distortion control decision to complete the distributed resource control under the composite power quality problem of this substation.

[0112] It can realize reasonable management and control of distributed resources based on the monitoring data of distribution station area, improve the power quality level of station area operation, and provide decision-making support for the efficient management and control of large-scale, multi-type and distributed resources in the distribution system.

[0113] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 3 As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in the above method embodiment are implemented.

[0114] Those skilled in the art will understand that Figure 3 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0115] In addition, the present invention also provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiment when executing the computer program.

[0116] In addition, the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiment are implemented.

[0117] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0118] The present invention is not limited to the structures which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A distributed resource management and control decision-making method, characterized in that: include: According to the type information of the grid-connected distributed resources in the distribution network, classify the various types of distributed resources in the distribution network; based on the frequency voltage data information of the grid-connected points in the distribution network, combined with the distributed resource access control target judgment criteria, determine the distributed resource access control tasks; Based on the voltage over-limit problem information of the distribution station area and the corresponding control tasks, the distributed resource access control decision under the voltage over-limit problem is determined according to the distributed resource access control criteria under the voltage over-limit problem; According to the harmonic distortion problem information of the distribution network area and the corresponding control tasks, combined with the distributed resource access control criteria under the harmonic distortion problem, the distributed resource access control decision of the harmonic distortion problem is determined; Based on the voltage over-limit and harmonic distortion problem information of the distribution network substation and the corresponding control tasks, the distributed resource access control execution decision of the complex power quality problem is determined according to the distributed resource access control criteria under the complex power quality problem.

2. The distributed resource management and control decision-making method according to claim 1 is characterized in that: The categories of distributed resources in the distribution network include distributed photovoltaic resources, energy storage resources, cut-off power electronic load resources, non-cut-off power electronic load resources, cut-off ordinary load resources and non-cut-off ordinary load resources.

3. The distributed resource management and control decision-making method according to claim 1 is characterized in that: The expression of the distributed resource access control target criterion is: Where: k i is the power quality control task of the grid connection point i in the distribution station area; K1 is a single control task for voltage exceeding the upper limit; K2 is a composite control task for voltage exceeding the upper limit and harmonic distortion exceeding the limit; K3 is a single control task for voltage exceeding the lower limit; K4 is a composite control task for voltage exceeding the lower limit and harmonic distortion exceeding the limit; K5 is a single control task for harmonic distortion exceeding the limit; K6 means that this distribution station area currently does not need power quality control; V i is the voltage amplitude of the distribution station area and grid connection point i; V max is the maximum limit of voltage amplitude in the distribution network; V min is the minimum limit of voltage amplitude in the distribution network; THD V,i Total harmonic distortion rate of voltage at the grid connection point i in the distribution station area; The maximum limit of the total harmonic distortion rate of the voltage at the grid connection point i in the distribution station area.

4. The distributed resource management and control decision-making method according to claim 1 is characterized in that: The distributed resource access control tasks include a single control task for voltage exceeding the upper limit, a compound control task for voltage exceeding the upper limit and harmonic distortion exceeding the limit, a single control task for voltage exceeding the lower limit, a compound control task for voltage exceeding the lower limit and harmonic distortion exceeding the limit, and a single control task for harmonic distortion exceeding the limit.

5. The distributed resource management and control decision-making method according to claim 4 is characterized in that: When the control task is a single control task when the voltage exceeds the upper limit or a single control task when the voltage exceeds the lower limit, determine the distributed resource access control decision for the voltage exceeding limit problem; When the control task is a single control task of harmonic distortion exceeding the limit, determine the distributed resource access control decision of the harmonic distortion problem; When the control task is a composite control task of voltage exceeding the upper limit and harmonic distortion exceeding the limit and a composite control task of voltage exceeding the lower limit and harmonic distortion exceeding the limit, the distributed resource access control execution decision of the composite power quality problem is determined.

6. The distributed resource management and control decision-making method according to claim 1, characterized in that: According to the harmonic distortion problem information of the distribution network area connection point and the corresponding control tasks, combined with the distributed resource access control criteria under the harmonic distortion problem, the distributed resource access control decision for the harmonic distortion problem is determined, including: According to the power data information collected from the distribution network area connection point, the non-fundamental frequency power flow direction of the distribution network area connection point is judged and its classification is determined; Based on the classified non-fundamental frequency power flow matching corresponding control tasks, decision analysis is performed on energy storage resources and power electronic load resources respectively to determine the distributed resource access control decision for harmonic distortion problems.

7. The distributed resource management and control decision-making method according to claim 6, characterized in that: The classification expression of the non-fundamental frequency power flow direction is: Where, d i is the flow direction of non-fundamental frequency power at the grid connection point i in the distribution substation area; D1 is the flow of non-fundamental frequency power at the grid connection point i in the distribution substation area from distributed resources to the distribution network; D2 is the flow of non-fundamental frequency power at the grid connection point i in the distribution substation area from the distribution network to distributed resources; It is the non-fundamental frequency power flowing to the distribution network from the distribution station area connection point i.

8. A distributed resource management and control decision system, characterized in that: include: The distributed resource management and control task determination module is used to classify various types of distributed resources in the distribution network according to the type information of the grid-connected distributed resources in the distribution station area; based on the frequency and voltage data information of the grid-connected points in the distribution station area, combined with the distributed resource access management and control target judgment criteria, the distributed resource access management and control tasks are determined; The voltage over-limit problem control module is used to determine the distributed resource access control decision for the voltage over-limit problem based on the voltage over-limit problem information of the distribution station area and the corresponding control tasks, according to the distributed resource access control criteria under the voltage over-limit problem; The harmonic distortion problem control module is used to determine the distributed resource access control decision for the harmonic distortion problem based on the harmonic distortion problem information of the distribution network area and the corresponding control tasks, combined with the distributed resource access control criteria under the harmonic distortion problem; The composite power quality problem control module is used to determine the execution decision of distributed resource access control under composite power quality problems based on the voltage over-limit and harmonic distortion problem information of the distribution network substation and grid connection point and the corresponding control tasks, and according to the distributed resource access control criteria under composite power quality problems.

9. The distributed resource management and control decision system according to claim 8, characterized in that: The categories of distributed resources in the distribution network include distributed photovoltaic resources, energy storage resources, cut-off power electronic load resources, non-cut-off power electronic load resources, cut-off ordinary load resources and non-cut-off ordinary load resources.

10. The distributed resource management and control decision system according to claim 8, characterized in that: The expression of the distributed resource access control target criterion is: Where: k i is the power quality control task of the grid connection point i in the distribution station area; K1 is a single control task for voltage exceeding the upper limit; K2 is a composite control task for voltage exceeding the upper limit and harmonic distortion exceeding the limit; K3 is a single control task for voltage exceeding the lower limit; K4 is a composite control task for voltage exceeding the lower limit and harmonic distortion exceeding the limit; K5 is a single control task for harmonic distortion exceeding the limit; K6 means that this distribution station area currently does not need power quality control; V i is the voltage amplitude of the distribution station area and grid connection point i; V max is the maximum limit of voltage amplitude in the distribution network; V min is the minimum limit of voltage amplitude in the distribution network; THD V,i Total harmonic distortion rate of voltage at the grid connection point i in the distribution station area; The maximum limit of the total harmonic distortion rate of the voltage at the grid connection point i in the distribution station area.

11. The distributed resource management and control decision system according to claim 8, characterized in that: The distributed resource access control tasks include a single control task for voltage exceeding the upper limit, a compound control task for voltage exceeding the upper limit and harmonic distortion exceeding the limit, a single control task for voltage exceeding the lower limit, a compound control task for voltage exceeding the lower limit and harmonic distortion exceeding the limit, and a single control task for harmonic distortion exceeding the limit.

12. The distributed resource management and control decision system according to claim 11, characterized in that: When the control task is a single control task when the voltage exceeds the upper limit or a single control task when the voltage exceeds the lower limit, determine the distributed resource access control decision for the voltage exceeding limit problem; When the control task is a single control task of harmonic distortion exceeding the limit, determine the distributed resource access control decision of the harmonic distortion problem; When the control task is a composite control task of voltage exceeding the upper limit and harmonic distortion exceeding the limit and a composite control task of voltage exceeding the lower limit and harmonic distortion exceeding the limit, the distributed resource access control execution decision of the composite power quality problem is determined.

13. The distributed resource management and control decision system according to claim 8, characterized in that: The harmonic distortion problem control module determines the distributed resource access control decision of the harmonic distortion problem based on the harmonic distortion problem information of the distribution network substation and the corresponding control tasks, combined with the distributed resource access control criteria under the harmonic distortion problem. According to the power data information collected by the distribution network substation and the grid-connected points, the non-fundamental frequency power flow direction of the distribution network substation and the grid-connected points is judged and classified; the corresponding control tasks are matched based on the classified non-fundamental frequency power flow direction, and decision analysis is performed on the energy storage resources and the power electronic load resources respectively, to determine the distributed resource access control decision of the harmonic distortion problem.

14. The distributed resource management and control decision system according to claim 13, characterized in that: The classification expression of the non-fundamental frequency power flow direction is: Where, d i is the flow direction of non-fundamental frequency power at the grid connection point i in the distribution substation area; D1 is the flow of non-fundamental frequency power at the grid connection point i in the distribution substation area from distributed resources to the distribution network; D2 is the flow of non-fundamental frequency power at the grid connection point i in the distribution substation area from the distribution network to distributed resources; It is the non-fundamental frequency power flowing to the distribution network from the distribution station area connection point i.

15. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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