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On-line evaluating method of urban network max power supply capability

A technology with maximum power supply capacity and urban power grid, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as error-prone, poor accuracy, and cumbersome calculation process

Active Publication Date: 2008-08-27
KUNMING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

The accuracy of the trial-and-error evaluation method depends on the rationality of the load distribution coefficient, and the calculation process is cumbersome and error-prone
The capacity-to-load ratio method uses the capacity-to-load ratio index to evaluate the macroscopic power supply capacity of the network to examine the network power supply capacity, and evaluates the network power supply capacity by the network's transformation capacity. When the system's power generation and transmission capacity is insufficient, the accuracy of the evaluation results of this method is relatively Difference

Method used

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  • On-line evaluating method of urban network max power supply capability
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  • On-line evaluating method of urban network max power supply capability

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Experimental program
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Effect test

Embodiment Construction

[0027] 1. Establish a DC power flow model based on the adjacency matrix

[0028] (1) Use the adjacency matrix to describe the grid structure model

[0029] The description of the grid structure adopts the adjacency matrix method. Assuming that there are n nodes in the graph, the adjacency matrix is ​​a square matrix of order n×n, and its matrix elements are d ij , when v i with v j There exists 1 between v j point directly to v i When the directed edge of , then d ij = 1, d ji = -1, otherwise d ij = d ji =0, the elements in the adjacency matrix D of the directed graph G are expressed as:

[0030]

[0031] Typical urban power grid and its equivalent topology such as figure 1 shown. In the figure ①~⑦ are vertex numbers; (1)~(8) are edge numbers; f 1 ~ f 8 is the active power flow of each branch. Depend on figure 1 The shown network shows that the adjacency matrix D arranged in the order of vertex numbers is

[0032] D = ...

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Abstract

The invention relates to an online evaluation approach to evaluate the maximum power supply capacity of urban power network, belonging to the technical field of advanced application of electric power system dispatching. The method employs data base connection modes(ADO and ODBC), reads the relative network topology and network nodes in EMS and analyses the topology of the urban power network by means of an adjacency matrix to build up a model for calculating the maximum power supply capacity of the urban power network; the model is a linear programming model based on DC power flow and takes the maximum load of the network as the target function, and power balance, rated capacities of the branch lines and power restriction of the nodes as the constraint condition. In the program, the linear programming is worked out through improved simplex method and error analysis is carried out to the result. The model has the advantages of big calculation speed and small calculation error as for light load network and is suitable for power networks that require repeated optimization and adjustment. Results from a great amount of calculation with the program show that the method is of efficacy and applicability.

Description

technical field [0001] The invention relates to an online evaluation method for the maximum power supply capacity of an urban power grid. It belongs to the advanced application technology field of power system dispatching. Background technique [0002] The maximum power supply capacity of the urban power grid usually refers to the maximum load that the network can supply under the condition that both the power generation capacity and any equipment are not overloaded. The traditional main methods for evaluating the power supply capacity of urban power grids include trial method, capacity load ratio method, maximum load multiple method and network maximum flow method, etc. The accuracy of the trial-and-error evaluation method depends on the rationality of the load distribution coefficient, and the calculation process is cumbersome and error-prone. The capacity-to-load ratio method uses the capacity-to-load ratio index to evaluate the macroscopic power supply capacity of the ...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06F17/00G06Q50/00G06Q50/06
CPCY04S10/545Y02E40/76Y02E40/70Y04S10/50
Inventor 束洪春胡泽江董俊刘可真孙士云唐岚刘志坚孙向飞杨毅常勇单节杉刘永泰
Owner KUNMING UNIV OF SCI & TECH
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