Photovoltaic information model modeling method for novel power distribution system

Abstract

The invention relates to a photovoltaic information model modeling method for a novel power distribution system, and the method comprises the steps: taking a common public information model standard of a power system as a modeling basis, and constructing a static model frame according to an information model modeling principle; and providing the capability of representing all distributed resources, and establishing static model features corresponding to the static model framework. The model constructed by the invention can accurately contain a power network model of the photovoltaic resources and accurately represent the static capability of the distributed photovoltaic resources.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power grid, and in particular to a photovoltaic information modeling method for a novel power distribution system. Background Art

[0002] In recent years, with the increasing prominence of global energy shortages, environmental pollution, and climate deterioration, accelerating the development and utilization of renewable energy has become a consensus of the international community. Solar energy is the world's largest and cleanest renewable energy. As one of the ideal energy sources for a future low-carbon society, solar energy is increasingly valued by countries around the world. Distributed photovoltaic power generation in my country started late, but has developed rapidly and continued to grow rapidly. At the same time, it has also brought unprecedented challenges to the production and operation of distribution networks and power supply services. In order to correctly understand the entire power grid and all its assets, as well as the impact of photovoltaics on the power grid, it is necessary to build an accurate photovoltaic network model and correctly represent the corresponding time scale capability characteristics. The current construction foundation of photovoltaic information models is weak and the logic is complex. There is currently a lack of unified and standardized photovoltaic models. It is urgent to establish a standardized model to support the monitoring and control of new distribution systems. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a photovoltaic information modeling method for a new type of power distribution system, which can establish a standardized photovoltaic information model.

[0004] The technical solution adopted by the present invention to solve the technical problem is: to provide a photovoltaic information modeling method for a new power distribution system, comprising the following steps:

[0005] Based on the common public information model standard of power system, a static model framework is constructed according to the information model modeling principles;

[0006] Provide the ability to represent all distributed resources and establish static model features corresponding to the static model framework.

[0007] The construction of a static model framework according to the information model modeling principles specifically includes:

[0008] A class PhotoVoltaicUnit is established to describe a photovoltaic unit, and the class PhotoVoltaicUnit is inherited from the class PowerElectricsUnit;

[0009] A class PowerElectronicsConnection is established to describe the grid connection relationship. The class PowerElectronicsConnection inherits from the class RegulatingCondEq and is associated with the class PowerElectricsUnit;

[0010] Create a class called terminal to be used as an electrical connection point for conductive equipment and associate it with the class ConnectivityNode;

[0011] The Location class is established to describe a specific location in the power system and is associated with the CoordinateSystem and PositionPoints classes.

[0012] The static model framework includes a distributed photovoltaic entity subset, a grid-connected point subset, a grid-connected device subset and a geographic coordinate subset.

[0013] The establishing of the static model features corresponding to the static model framework specifically includes:

[0014] Create a PV entity subset in the PhotoVoltaicUnit class, including name, maximum active output, minimum active output, power electronic grid-connected device and location;

[0015] In the PowerElectronicsConnection class, a grid-connected point subset and a grid-connected device subset are established, including the name, whether it is controlled, the maximum withstand fault current, the maximum active / reactive output, the rated capacity value, the rated voltage value and the grid-connected device terminal;

[0016] Establish a topological association subset in the class terminal, including the endpoint direction, network phase state and associated devices of the multi-endpoint device;

[0017] Create a geographic coordinate subset in the Location class, including the coordinate system and coordinate points.

[0018] The static model features include rated maximum power, number of phases, rated current and voltage, grid connection point, network and circuit topology.

[0019] Beneficial Effects

[0020] Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the present invention relies on the common information model standard (CIM, Common Information Model) commonly used in power systems as a modeling basis, and can construct an accurate power network model including photovoltaic resources, and accurately characterize the static capabilities of distributed photovoltaic resources, support the description capabilities of different phases, different voltage levels, and different access methods, and provide accurate and standard topological structures and static feature description capabilities for the perception of precise power grid status. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a flow chart of a photovoltaic information modeling method for a new power distribution system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0023] The embodiment of the present invention relates to a photovoltaic information modeling method for a new power distribution system, such as Figure 1 As shown, the following steps are included:

[0024] Step 1: Based on the common public information model standard of the power system, a static model framework is constructed according to the information model modeling principles.

[0025] This step builds a static model framework covering subsets such as distributed photovoltaic entities, grid connection points, grid connection devices, and geographic coordinates based on the information model modeling principles, including:

[0026] In the first step, the Web Ontology Language (OWL) is composed of a series of basic elements, including classes, attributes, individuals, etc. Classes provide a mechanism for grouping resources with the same attributes or characteristics. Photovoltaic power generation is a green and clean form of power generation that converts solar energy into electrical energy. Therefore, a class PhotoVoltaicUnit is established to describe a photovoltaic unit, and the class PhotoVoltaicUnit inherits from the class PowerElectricsUnit.

[0027] The second step is to establish the class PowerElectronicsConnection for describing the grid-connected relationship, which belongs to the power line package. The class PowerElectronicsConnection inherits from the class RegulatingCondEq and is associated with the class PowerElectricsUnit.

[0028] The third step is to create a class called Terminal that is used as an electrical connection point for conductive devices. It belongs to the core package and is associated with the ConnectivityNode class.

[0029] The fourth step is to create a class Location to describe a specific location in the power system. It belongs to the public package and is associated with the classes CoordinateSystem and PositionPoints.

[0030] Step 2: Provide the capability of representing all distributed resources and establish static model features corresponding to the static model framework.

[0031] This step provides the ability to represent all distributed resources and establish corresponding static model features, including:

[0032] In the first step, a subset of photovoltaic entities is established in the class PhotoVoltaicUnit, including the name, maximum active output, minimum active output, power electronic grid-connected device and location.

[0033] The second step is to establish a grid-connected point subset and a grid-connected device subset in the PowerElectronicsConnection class, including the name, whether it is controlled, the maximum withstand fault current, the maximum active / reactive output, the rated capacity value, the rated voltage value and the grid-connected device terminals.

[0034] The third step is to establish a topological association subset in the terminal class, including the endpoint direction, network phase status and associated devices of the multi-endpoint device.

[0035] The fourth step is to create a geographic coordinate subset in the Location class, including the coordinate system and coordinate points.

[0036] The static model features established in this step include rated maximum power, number of phases (three-phase or single-phase distributed photovoltaic), rated current and voltage, grid connection point, network and circuit topology.

[0037] The model constructed by the above method is based on the common public information model standard model of the power system. It can be used as a photovoltaic resource model without involving asset and business models. The model can accurately represent the power network model containing photovoltaic resources, accurately characterize the static capabilities of distributed photovoltaic resources, support the description capabilities of different phases, different voltage levels, and different access methods, and provide accurate and standard topological structures and static feature description capabilities for the perception of precise power grid status.

Claims

1. A photovoltaic information modeling method for a new power distribution system, characterized in that: The following steps are involved: Based on the common public information model standard of power system, a static model framework is constructed according to the information model modeling principles; Provide the ability to represent all distributed resources and establish static model features corresponding to the static model framework.

2. The photovoltaic information modeling method for a new power distribution system according to claim 1 is characterized in that: The construction of a static model framework according to the information model modeling principles specifically includes: A class PhotoVoltaicUnit is established to describe a photovoltaic unit, and the class PhotoVoltaicUnit inherits from the class PowerElectricsUnit; A class PowerElectronicsConnection is established to describe the grid connection relationship. The class PowerElectronicsConnection inherits from the class RegulatingCondEq and is associated with the class PowerElectricsUnit; Create a class called terminal to be used as an electrical connection point for conductive equipment and associate it with the class ConnectivityNode; The Location class is established to describe a specific location in the power system and is associated with the CoordinateSystem and PositionPoints classes.

3. The photovoltaic information modeling method for a new power distribution system according to claim 1, characterized in that: The static model framework includes a distributed photovoltaic entity subset, a grid-connected point subset, a grid-connected device subset and a geographic coordinate subset.

4. The photovoltaic information modeling method for a new power distribution system according to claim 2, characterized in that: The establishing of the static model features corresponding to the static model framework specifically includes: Create a PV entity subset in the PhotoVoltaicUnit class, including name, maximum active output, minimum active output, power electronic grid-connected device and location; In the PowerElectronicsConnection class, a grid-connected point subset and a grid-connected device subset are established, including the name, whether it is controlled, the maximum withstand fault current, the maximum active / reactive output, the rated capacity value, the rated voltage value and the grid-connected device terminal; Establish a topological association subset in the class terminal, including the endpoint direction, network phase state and associated devices of the multi-endpoint device; Create a geographic coordinate subset in the Location class, including the coordinate system and coordinate points.

5. The photovoltaic information modeling method for a new power distribution system according to claim 1, characterized in that: The static model features include rated maximum power, number of phases, rated current and voltage, grid connection point, network and circuit topology.

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