CN-121984095-A - Micro-grid group scheduling method and system

CN121984095ACN 121984095 ACN121984095 ACN 121984095ACN-121984095-A

Abstract

The invention discloses a dispatching method and a dispatching system of a micro-grid group, which are applied to a target micro-grid group at least comprising a plurality of sub-micro-grids, wherein the method comprises the steps of obtaining a daily global dispatching scheme of the target micro-grid group; in the process of executing a global scheduling scheme before the day, the scheduling requirement of a first sub-micro grid is determined by analyzing an operation fluctuation signal, the operation tension degree of a second sub-micro grid in a non-fluctuation state is determined, the electric coupling relation between the first sub-micro grid and the second sub-micro grid is analyzed based on the network topology of a target micro grid group, an effective second sub-micro grid is obtained through screening according to analysis results, the effective second sub-micro grid is scheduled preferentially based on the scheduling requirement and the operation tension degree, the scheduling scheme is determined, and the power output of each second sub-micro grid in the target micro grid group is adjusted at least according to the scheduling scheme. The dispatching method and system for the micro-grid group effectively improve the operation efficiency of the micro-grid group.

Inventors

Weng Xiuliang
HUANG TINGYU
ZHU QIWEI
ZHOU CUILUAN
CHEN YANG
WU SHIHUA
YANG JIAN
WANG WANHUAN
WEN QINGKAO
LIN DAOZONG
XU FANG
HUANG SHAN
CHEN WEIWEI
SUN JINGLIAO
Yang Shounuo
XIANG YEJUN

Assignees

国网浙江省电力有限公司平阳县供电公司

Dates

Publication Date: 20260505
Application Date: 20260407

Claims (10)

1. The dispatching method of the micro-grid group is applied to a target micro-grid group at least comprising a plurality of sub-micro-grids, and is characterized by comprising the following steps: acquiring a day-ahead global scheduling scheme of the target micro-grid group; In the process of executing the day-ahead global scheduling scheme, responding to an operation fluctuation signal of at least one sub-micro grid, analyzing the operation fluctuation signal to determine the scheduling requirement of a first sub-micro grid, wherein the operation fluctuation signal is determined by the first sub-micro grid in a fluctuation state; determining the operation tension degree of a second sub-micro grid in a non-fluctuation state based on the global scheduling scheme before the day and the real-time operation states of all the sub-micro grids; Analyzing the electric coupling relation between the first sub-micro grid and the second sub-micro grid based on the network topology of the target micro grid group, and screening analysis results to obtain an effective second sub-micro grid; determining a scheduling scheme based on the scheduling requirement and the running tension priority to schedule the active second sub-microgrid; And adjusting the power output of each second sub-micro grid in the target micro grid group at least according to the scheduling scheme.
2. The method for dispatching a group of micro-grids according to claim 1, wherein said analyzing the operational fluctuation signal to determine the dispatching requirement of the first sub-micro-grid comprises: extracting the net load fluctuation from the operation fluctuation signal; performing modal decomposition processing on the payload fluctuation to obtain payload fluctuation to be analyzed; based on the operation data of the first sub-micro grid, performing sensitivity analysis on the payload fluctuation to be analyzed, and extracting unbalanced power; And analyzing the unbalanced power to obtain the scheduling requirement according to an analysis result.
3. The method of scheduling a group of micro-grids according to claim 1, wherein said determining the operation stress level of the second sub-micro-grid in the non-fluctuating state based on the day-ahead global scheduling scheme and the real-time operation states of all the sub-micro-grids comprises: obtaining the planned task quantity of each second sub-micro power grid based on the day-ahead global scheduling scheme; under the real-time running state, calculating the total adjustment power range which can be realized relative to the planned task quantity according to the physical running constraint of the second sub-micro grid, and determining flexible adjustment capability; And carrying out quantization normalization processing on the flexible adjustment capability to obtain the running tension degree.
4. A method of scheduling a group of micro-grids according to claim 3, wherein said calculating a total range of regulated power achievable relative to the planned task volume based on physical operating constraints of the second sub-micro-grid comprises: Performing association analysis on the planned task quantity and the real-time running state of the second sub-micro grid to obtain a current running point of the second sub-micro grid; performing boundary mapping processing on the current operating point and the physical operating constraint of the second sub-micro grid to obtain adjustable upper and lower power limits of the second sub-micro grid; calculating the upper and lower limits of the adjustable power of the second sub-micro power grid to obtain total upward adjustment capability and total downward adjustment capability relative to the planned task amount; and constructing a section of the total upward regulation capacity and the total downward regulation capacity to obtain the total regulation power range.
5. The method for dispatching a micro-grid group according to claim 1, wherein the analyzing the electrical coupling relationship between the first sub-micro-grid and the second sub-micro-grid based on the network topology of the target micro-grid group to screen the analysis result to obtain the effective second sub-micro-grid comprises: Analyzing the network topology of the target micro-grid group to obtain an electrical connection relationship between the first sub-micro-grid and the second sub-micro-grid; performing path traversal on the electrical connection relation to obtain a candidate electrical coupling path set; Screening the candidate electric coupling path set based on a preset electric coupling effectiveness condition to obtain an effective electric coupling relation; And performing home mapping on the effective electric coupling relation to obtain the effective second sub-micro grid according to a mapping result.
6. The method of scheduling a group of micro-grids according to claim 1, wherein said determining a scheduling scheme based on said scheduling requirements and said running stress prioritizes scheduling said active second sub-micro-grid comprises: Carrying out fusion processing on the scheduling requirement and the operation tension degree to obtain the scheduling priority of the effective second sub-micro grid; performing matching analysis on the scheduling priority and the operation tension degree of the effective second sub-micro grid to obtain a candidate allocation scheme; carrying out feasibility verification on the candidate allocation scheme to obtain a feasible scheduling combination; and integrating the feasible scheduling combinations to obtain the scheduling scheme.
7. The method for dispatching a group of micro-grids according to claim 6, wherein said matching the dispatching priority and the running stress of the active second sub-micro-grid to obtain a candidate allocation scheme comprises: Processing the effective second sub-micro-grid corresponding to the dispatching priority based on the dispatching priority to obtain a preliminary adjustment quantity of the effective second sub-micro-grid; accumulating the preliminary adjustment quantity, and processing the scheduling requirement according to an accumulation result to obtain an updated scheduling requirement; When the updated scheduling requirement or the effective second sub-micro grid meets a preset condition, an adjustment distribution combination is obtained; And integrating the adjustment distribution combination to obtain the candidate distribution scheme.
8. The method of scheduling a group of micro-grids according to claim 1, wherein the effective second sub-micro-grid is scheduled preferentially based on the scheduling requirement and the run-length, determining a scheduling scheme, further comprising: after the scheduling scheme is obtained, the running state data of the target micro-grid group are collected, and reactive power distribution information of the sub-micro-grid is obtained; processing the reactive power distribution information to obtain a correction requirement of insufficient reactive support; Evaluating reactive power regulation capacity of the effective second sub-micro grid in the dispatching scheme to obtain available reactive power support resources; matching and distributing the available reactive power support resources and the correction requirements to obtain a reactive power support additional instruction; and processing the scheduling scheme based on the reactive support additional instruction to obtain an enhanced collaborative scheduling scheme.
9. The method of scheduling a group of micro-grids of claim 1, wherein the adjusting the power output of each of the second sub-micro-grids in the target group of micro-grids at least in the scheduling scheme further comprises: synchronously acquiring the actual power output of the scheduling scheme and the actual power output of the second sub-micro grid to obtain a corresponding relation between a scheduling instruction and an execution result; Performing deviation calculation processing on the scheduling instruction and the execution result to obtain the power tracking deviation amount of the second sub-micro power grid; performing overrun judgment on the power tracking deviation amount and a preset tolerance threshold value to obtain a sub-micro grid set to be corrected and a correction demand; And analyzing the correction demand and the corresponding second sub-micro grid to generate a correction scheduling scheme according to the matching result.
10. A dispatch system for a microgrid group, applied to a target microgrid group at least comprising a plurality of sub-microgrids, comprising: The acquisition module is used for acquiring a day-ahead global scheduling scheme of the target micro-grid group; The response module is used for responding to the operation fluctuation signal of at least one sub-micro grid in the process of executing the day-ahead global scheduling scheme, analyzing the operation fluctuation signal to determine the scheduling requirement of a first sub-micro grid, wherein the operation fluctuation signal is determined by the first sub-micro grid in a fluctuation state; The second module is used for determining the operation tension degree of a second sub-micro grid in a non-fluctuation state based on the global scheduling scheme before the day and the real-time operation states of all the sub-micro grids; The analysis module is used for analyzing the electric coupling relation between the first sub-micro grid and the second sub-micro grid based on the network topology of the target micro grid group, and screening analysis results to obtain an effective second sub-micro grid; the scheduling module is used for preferentially scheduling the effective second sub-micro-grid based on the scheduling requirement and the operation tension degree, and determining a scheduling scheme; And the adjusting module is used for adjusting the power output of each second sub-micro grid in the target micro grid group at least according to the scheduling scheme.

Description

Micro-grid group scheduling method and system Technical Field The invention relates to the technical field of micro-grid groups, in particular to a dispatching method and system of a micro-grid group. Background Through cooperative operation, the micro-grid group can improve the renewable energy consumption capability, enhance the power supply reliability, reduce the energy consumption cost and realize the complementary interaction of the source and the charge storage resources. The efficient collaborative scheduling strategy gives full play to the advantages of the efficient collaborative scheduling strategy, and coordinates the power balance and interaction of all sub-micro power grids, thereby realizing global economic optimization and safe and stable operation. Current micro-grid group scheduling strategies are generally divided into two phases, day-ahead scheduling and day-in scheduling. The day-ahead schedule makes a 24-hour operation plan based on the prediction data, and the day-ahead schedule completely depends on the made 24-hour operation plan to perform operations such as charge-discharge strategy or voltage out-of-limit protection of the energy storage charge state. For example, during the day-ahead dispatch period, the system predicts that the sub-grid sunlight photovoltaic output is high based on weather forecast, and then schedules a 24 hour schedule to charge the energy storage system at 12:00-14:00 noon and discharge 18:00-20:00 to support late peak loads. When the solar energy storage device runs in the day, the actual weather suddenly changes, the photovoltaic output suddenly drops by 60%, but the solar energy storage device still mechanically executes the original plan, and the stored energy is still charged according to the original time, so that the insufficient power is further pumped away, and the local voltage is caused to drop. Therefore, when the dispatching mode faces strong randomness and rapid fluctuation of renewable energy output, the dispatching mode is difficult to respond to the change of an actual running state in time, and the problems of local power unbalance, premature exhaustion of standby capacity, node voltage out-of-limit, equipment overload and the like are extremely easy to occur. Eventually, the overall operation efficiency is obviously reduced, the energy utilization benefit is limited, and the long-term operation reliability faces challenges. Disclosure of Invention The invention provides a dispatching method and a dispatching system for a micro-grid group, which aim to solve the technical problem that the execution efficiency of dispatching machinery in the day is low in the prior art scheme, so as to achieve the effect of improving the overall operation efficiency of the micro-grid group. In order to solve the technical problems, the invention provides a dispatching method and a dispatching system for a micro-grid group, wherein the dispatching method comprises the following steps: acquiring a day-ahead global scheduling scheme of the target micro-grid group; In the process of executing the day-ahead global scheduling scheme, responding to an operation fluctuation signal of at least one sub-micro grid, analyzing the operation fluctuation signal to determine the scheduling requirement of a first sub-micro grid, wherein the operation fluctuation signal is determined by the first sub-micro grid in a fluctuation state; determining the operation tension degree of a second sub-micro grid in a non-fluctuation state based on the global scheduling scheme before the day and the real-time operation states of all the sub-micro grids; Analyzing the electric coupling relation between the first sub-micro grid and the second sub-micro grid based on the network topology of the target micro grid group, and screening analysis results to obtain an effective second sub-micro grid; determining a scheduling scheme based on the scheduling requirement and the running tension priority to schedule the active second sub-microgrid; And adjusting the power output of each second sub-micro grid in the target micro grid group at least according to the scheduling scheme. Preferably, the analyzing the operation fluctuation signal to determine the scheduling requirement of the first sub-micro grid includes: extracting the net load fluctuation from the operation fluctuation signal; performing modal decomposition processing on the payload fluctuation to obtain payload fluctuation to be analyzed; based on the operation data of the first sub-micro grid, performing sensitivity analysis on the payload fluctuation to be analyzed, and extracting unbalanced power; And analyzing the unbalanced power to obtain the scheduling requirement according to an analysis result. Preferably, the determining the operation tension degree of the second sub-micro-grid in the non-fluctuation state based on the global scheduling scheme before the day and the real-time operation states of all the sub-micro-grids includes