Optimization method for load flow calculation of active distribution network

A technology of active distribution network and optimization method, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as lack of accurate mathematical description and method, long calculation time, and large amount of calculation

Inactive Publication Date: 2015-02-18
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

Intelligent optimization algorithms have developed rapidly in recent years, mainly including artificial neural network algorithms, simulated annealing algorithms, tabu search algorithms, ant colony algorithms, particle swarm optimization algorithms, genetic algorithms, etc. Artificial intelligence algorithms have good global search performanc

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  • Optimization method for load flow calculation of active distribution network
  • Optimization method for load flow calculation of active distribution network
  • Optimization method for load flow calculation of active distribution network

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Embodiment Construction

[0052] An optimization method for power flow calculation of an active distribution network, comprising the following steps:

[0053] S1: Active distribution network can be regarded as containing n b A simple system diagram of a node and M branches. The radiation operation of the distribution network requires that all nodes be connected and there is no closed loop, so it comes down to the concept of "tree" to illustrate this problem. The definition of "tree" in the electrical network theory is: a tree T of a connected graph G contains all the nodes and some branches of G, and the tree T itself is connected and does not contain loops. At the same time, one with n b A connected graph of nodes, the number of branches of any tree of it is formula (1):

[0054] M=n b -1 (1)

[0055] The network structure of the active distribution network can form a radial operation structure according to the concept of "tree". According to the above analysis, it can be concluded that the radia...

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Abstract

The invention discloses an optimization method for load flow calculation of an active distribution network. The optimization method comprises the following steps that S1, the number of branches of any tree of the active distribution network is expressed as the formula (1); S2, the minimum sum of transmission power of branches of the active distribution network is adopted as an objective, branch transmission power constraints are given, a radial network structure is determined, and node power balance is achieved; S3, the minimum active power transmission loss is adopted as an objective function; S4, equality constraints comprise a load flow constraint and a network radial constraint; S5, inequality constraints are composed of a node voltage constraint, an active and reactive force output constraint and a branch current constraint; S6, all the constraints and sij are multiplied, and only when sij=1, are the branches connected into the active distribution network for calculation. Transmission losses are reduced, meanwhile, security running of a system can be guaranteed, power grid control and distributed generation access are improved, and power grid voltage quality is improved. The complex load flow calculation of the active distribution network is simplified, and is convenient and easy to implement, and the control and adjusting method of the active distribution network is more scientific.

Description

technical field [0001] The invention relates to the application field of an active distribution network of a power system, in particular to an optimization method for calculating a power flow of an active distribution network. Background technique [0002] Active distribution network (ADN) is a system composed of micro-power sources, loads, energy storage systems and control devices. It is a single controllable unit for the large power grid, which can realize the highly reliable supply of multiple energy forms for the load. There are two main characteristics of the active distribution network: one is that it contains local power generation devices, mostly distributed power sources with small capacity. Distributed Generation Resource (DGR) usually refers to mainly using renewable new energy and generating power It is a small modular, environment-compatible independent power supply from a few kW to 50MW, which can meet the specific requirements of the power system and users. ...

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 沈鑫闫永梅曹敏张林山丁心志王昕王恩
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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