Low-voltage distribution area source network load storage coordination control method

Abstract

The invention relates to a low-voltage distribution area source network load storage coordination control method, which comprises the following steps of: constructing a multi-area power grid topological structure; the method comprises the following steps: acquiring a source network load electric power quantity space-time dynamic complementary balance characteristic of a low-voltage single-phase power supply network, an electric power quantity space-time dynamic complementary balance characteristic of a low-voltage three-phase distributed source load resource and an electric power quantity space-time dynamic complementary balance characteristic, and analyzing a station area source network load storage electric power quantity balance characteristic; afterwards, on the basis of the transformer area source network load storage electric power and electric quantity balance characteristics, a low-voltage single-phase power distribution network source network load coordination control strategy is formulated, meanwhile, on the basis of the safe power supply requirement, a functional framework of a low-voltage power distribution transformer area source network load storage coordination control system is provided, and finally, the low-voltage power distribution transformer area source network load storage coordination control system is established. Based on a low-voltage distribution area source network load storage coordinated control strategy and a functional architecture of a low-voltage distribution area source network load storage coordinated control system, coordinated optimization control is carried out on low-voltage distribution area source network load storage; the method has the advantages of safety, stability, reasonability and high efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of power grid coordinated control, and in particular relates to a source-grid-load-storage coordinated control method for a low-voltage distribution station area. Background Art

[0002] With the continuous development of the economy and society, the development of emerging loads such as electric vehicles has provided diversified control resources and capabilities for the coordinated control of distributed sources, grids, loads and storage. However, due to a series of power supply quality problems such as three-phase imbalance, voltage over-limit, high harmonic content, voltage fluctuation and flicker brought by new load equipment and distributed power sources, the low-voltage distribution network faces more prominent supply and demand matching and power balance problems, that is, distributed power sources are difficult to be consumed on-site, and power reverse transmission and reverse heavy overload phenomena occur, which seriously affect the safe and efficient operation of the distribution network; therefore, in order to achieve the optimal scheduling and operation of the distribution network and improve the power supply capacity and the consumption capacity of distributed power sources of the distribution network, it is necessary to develop a safe, stable, reasonable and efficient low-voltage distribution station area source-grid-load coordinated control method. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a safe, stable, reasonable and efficient voltage distribution station area source-grid-load-storage coordinated control method.

[0004] The object of the present invention is achieved in this way: a low-voltage distribution station area source-grid-load-storage coordinated control method comprises the following steps: Step 1: Construct a multi-regional power grid topology structure, and then based on the use of low-voltage single-phase multi-port power supply equipment, study and obtain the spatiotemporal dynamic complementary balance characteristics of the source-grid-load power of the low-voltage single-phase power supply network, the spatiotemporal dynamic complementary balance characteristics of the power of the low-voltage three-phase distributed source-load resources, and the spatiotemporal dynamic complementary balance characteristics of the power; Step 2: Based on the balance characteristics studied and obtained in step 1, analyze the balance characteristics of power and electricity of the power source, grid, load and storage in the substation area; Step 3: Based on the power balance characteristics of the source, grid, load and storage in the substation area in step 2, formulate a coordinated control strategy for the source, grid and load of the low-voltage single-phase distribution network; Step 4: Establish a cost-effective model for the source-grid-load side and the power supply side of the substation, and based on this model, formulate a low-voltage single-phase source-grid-load multi-objective optimization scheduling strategy; then, based on the safe power supply of the low-voltage single-phase distribution network, propose a source-grid-load coordinated control strategy for distributed source-load resources; finally, based on the low-voltage single-phase source-grid-load multi-objective optimization scheduling strategy and source-grid-load coordinated control strategy, formulate a low-voltage distribution substation source-grid-load-storage coordinated control strategy; Step 5: Based on the power balance characteristics of the power grid, load and storage in the substation area in step 2 and based on the requirements of safe power supply, the functional architecture of the low-voltage distribution substation area power grid, load and storage coordination control system is proposed; Step 6: Based on the low-voltage distribution station area source-grid-load-storage coordinated control strategy in step 4 and the functional architecture of the low-voltage distribution station area source-grid-load-storage coordinated control system in step 5, coordinate and optimize the control of the low-voltage distribution station area source-grid-load-storage.

[0005] Furthermore, the cost-benefit model in step 4 is established by quantitatively analyzing the functions and benefits of each component of the smart distribution network while comprehensively considering the linear and invisible investment benefits of the smart distribution network.

[0006] Furthermore, in step 1, typical daily scenes in different seasons can be selected to characterize the clean energy output, load characteristics and cross-section flow power in typical scenes, thereby constructing an inter-regional cross-section interconnection power optimization adjustment strategy and an inter-regional source-load interaction model.

[0007] Beneficial effects of the present invention: The present invention first constructs a multi-regional power grid topology structure to obtain the spatiotemporal dynamic complementary balance characteristics of the source, grid, and load of the low-voltage single-phase power supply network, the spatiotemporal dynamic complementary balance characteristics of the power and electricity of the low-voltage three-phase distributed source and load resources, and the spatiotemporal dynamic complementary balance characteristics of the power and electricity, and analyzes the power balance characteristics of the source, grid, and load storage in the substation area; then, based on the power balance characteristics of the source, grid, and load in the substation area, a source, grid, and load coordinated control strategy for the low-voltage single-phase distribution network is formulated, and based on the requirements for safe power supply, a functional architecture of the source, grid, and load storage coordinated control system for the low-voltage distribution station area is proposed; finally, based on the source, grid, and load storage coordinated control strategy for the low-voltage distribution station area and the functional architecture of the source, grid, and load storage coordinated control system for the low-voltage distribution station area, the source, grid, and load storage in the low-voltage distribution station area is coordinated and optimized. The present invention adopts this structure to solve the problems of voltage over-limit, power over-limit, and reverse transmission on the substation side, realizes the maximum consumption of distributed power sources, reduces line losses, cuts peaks and fills valleys, and improves power supply capacity; in general, the present invention has the advantages of safety, stability, rationality and high efficiency. DETAILED DESCRIPTION

[0008] The present invention is further described below.

[0009] Embodiment: A method for coordinated control of source, grid, load and storage in a low-voltage distribution station area comprises the following steps: Step 1: Construct a multi-regional power grid topology, and by selecting typical daily scenes in different seasons, characterize the clean energy output, load characteristics and section flow power in typical scenes, so as to construct an inter-regional section connection power optimization adjustment strategy and an inter-regional source-load interaction model. Then, based on the use of low-voltage single-phase multi-port power supply equipment, study and obtain the spatiotemporal dynamic complementary balance characteristics of the source-grid-load power of the low-voltage single-phase power supply network, the spatiotemporal dynamic complementary balance characteristics of the power of the low-voltage three-phase distributed source-load resources, and the spatiotemporal dynamic complementary balance characteristics of the power; Step 2: Based on the balance characteristics studied and obtained in step 1, analyze the balance characteristics of power and electricity of the power source, grid, load and storage in the substation area; Step 3: Based on the power balance characteristics of the source, grid, load and storage in the substation area in step 2, formulate a coordinated control strategy for the source, grid and load of the low-voltage single-phase distribution network; Step 4: By quantitatively analyzing the functions and benefits of each component of the smart distribution network, the linear and invisible investment benefits of the smart distribution network are fully considered, and a cost-effective model of the source-grid-load load side and the power supply side of the substation is established. Based on this model, a multi-objective optimization scheduling strategy for low-voltage single-phase source-grid-load is formulated; then, based on the safe power supply of the low-voltage single-phase distribution network, a source-grid-load coordinated control strategy for distributed source-load resources is proposed; finally, based on the low-voltage single-phase source-grid-load multi-objective optimization scheduling strategy and the source-grid-load coordinated control strategy, a source-grid-load-storage coordinated control strategy for low-voltage distribution substations is formulated; Step 5: Based on the power balance characteristics of the power grid, load and storage in the substation area in step 2 and based on the requirements of safe power supply, the functional architecture of the low-voltage distribution substation area power grid, load and storage coordination control system is proposed; Step 6: Based on the low-voltage distribution station area source-grid-load-storage coordinated control strategy in step 4 and the functional architecture of the low-voltage distribution station area source-grid-load-storage coordinated control system in step 5, coordinate and optimize the control of the low-voltage distribution station area source-grid-load-storage.

[0010] When the present invention is in use, first, by constructing a multi-regional power grid topology structure and selecting typical daily scenes in different seasons, the clean energy output, load characteristics and section flow power in typical scenes are characterized, thereby constructing an inter-regional section connection power optimization adjustment strategy and an inter-regional source-load interaction model. Then, while obtaining the source-grid-load and electric power spatiotemporal dynamic complementary balance characteristics of the low-voltage single-phase power supply network, the electric power spatiotemporal dynamic complementary balance characteristics of the low-voltage three-phase distributed source-load resources, and the electric power spatiotemporal dynamic complementary balance characteristics, the source-grid-load-storage electric power balance characteristics of the substation are analyzed. Then, based on the source-grid-load-storage electric power balance characteristics of the substation, a source-grid-load coordinated control strategy for the low-voltage single-phase distribution network is formulated, and based on the requirements for safe power supply, a functional architecture of the source-grid-load-storage coordinated control system for the low-voltage distribution substation is proposed. In this process, a substation source-grid-load-storage coordinated control strategy for the low-voltage single-phase distribution network can be established. A cost-effective model of the power supply side and the power supply side is developed, and based on this model, a multi-objective optimization scheduling strategy for low-voltage single-phase source, grid and load is formulated; and afterwards, based on the safe power supply of the low-voltage single-phase distribution network, a source-grid-load coordinated control strategy for distributed source-load resources is proposed; finally, based on the low-voltage single-phase source-grid-load multi-objective optimization scheduling strategy and the source-grid-load coordinated control strategy, a low-voltage distribution station area source-grid-load-storage coordinated control strategy is formulated; after completing the above operations, based on the functional architecture of the low-voltage distribution station area source-grid-load-storage coordinated control strategy and the low-voltage distribution station area source-grid-load-storage coordinated control system, the low-voltage distribution station area source-grid-load-storage is coordinated and optimized. The present invention adopts this structure to solve the problems of voltage over-limit, power over-limit and reverse transmission on the station area side, realizes the maximum consumption of distributed power sources, reduces line losses, cuts peaks and fills valleys, and improves power supply capacity; in general, the present invention has the advantages of safety, stability, rationality and high efficiency.

[0011] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A method for coordinated control of source, grid, load and storage in a low-voltage distribution station area, characterized in that: The following steps are involved: Step 1: Construct a multi-regional power grid topology structure, and then based on the use of low-voltage single-phase multi-port power supply equipment, study and obtain the spatiotemporal dynamic complementary balance characteristics of the source-grid-load power of the low-voltage single-phase power supply network, the spatiotemporal dynamic complementary balance characteristics of the power of the low-voltage three-phase distributed source-load resources, and the spatiotemporal dynamic complementary balance characteristics of the power; Step 2: Based on the balance characteristics studied and obtained in step 1, analyze the balance characteristics of power and electricity of the power source, grid, load and storage in the substation area; Step 3: Based on the power balance characteristics of the source, grid, load and storage in the substation area in step 2, formulate a coordinated control strategy for the source, grid and load of the low-voltage single-phase distribution network; Step 4: Establish a cost-effective model for the source-grid-load side and the power supply side of the substation, and based on this model, formulate a low-voltage single-phase source-grid-load multi-objective optimization scheduling strategy; then, based on the safe power supply of the low-voltage single-phase distribution network, propose a source-grid-load coordinated control strategy for distributed source-load resources; finally, based on the low-voltage single-phase source-grid-load multi-objective optimization scheduling strategy and source-grid-load coordinated control strategy, formulate a low-voltage distribution substation source-grid-load-storage coordinated control strategy; Step 5: Based on the power balance characteristics of the power grid, load and storage in the substation area in step 2 and based on the requirements of safe power supply, the functional architecture of the low-voltage distribution substation area power grid, load and storage coordination control system is proposed; Step 6: Based on the low-voltage distribution station area source-grid-load-storage coordinated control strategy in step 4 and the functional architecture of the low-voltage distribution station area source-grid-load-storage coordinated control system in step 5, coordinate and optimize the control of the low-voltage distribution station area source-grid-load-storage.

2. A low voltage distribution station area source-grid-load-storage coordinated control method as claimed in claim 1, characterized in that: The cost-benefit model in step 4 is established by quantitatively analyzing the functions and benefits of each component of the smart distribution network while comprehensively considering the linear and invisible investment benefits of the smart distribution network.

3. A low voltage distribution station area source-grid-load-storage coordinated control method as claimed in claim 1, characterized in that: In step 1, typical daily scenes in different seasons can be selected to characterize the clean energy output, load characteristics and cross-section flow power in typical scenes, thereby constructing an inter-regional cross-section interconnection power optimization adjustment strategy and an inter-regional source-load interaction model.