Calculation method of power flow in distribution network based on forward push-back generation
A technology of forward and backward generation and power flow calculation, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problems of slow speed, poor convergence, and large ratio of resistance to reactance in distribution network.
Active Publication Date: 2017-01-18
STATE GRID CORP OF CHINA +2
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Problems solved by technology
On the one hand, the distribution network has a huge number of tie switches and section switches, and distribution network automation demonstration projects have been fully rolled out in cities across the country. Network reconstruction is an important part of distribution automation. The switch state can reduce the network loss. Since the load changes in real time, it is required that the main station system can adapt to the load change and adjust the switch state in real time. Due to the large resistance-reactance ratio of the distribution network, the traditional power flow calculation method has poor convergence and speed It is difficult to meet the requirements of fast power flow calculation; on the other hand, distribution network online simulation technology is the core content of smart distribution network, and fast power flow calculation is the basis of online simulation
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[0037] The present invention will be further described below in conjunction with the accompanying drawings. The following implementation examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.
[0038] The power flow calculation method of the distribution network based on the forward push-back generation of the present invention can perform the power flow calculation of the radial network without forming a node admittance matrix and solving high-order equations. The calculation formula is simple and the convergence is fast, which is very practical. Such as figure 1 As shown, it specifically includes the following steps,
[0039] Step (1), through the distribution network topology undirected graph modeling method, the distribution network is simplified into an undirected graph, undirected graph, figure 2 For a simple distribution network, image 3 for figure 2 undi...
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The invention discloses a power distribution network load flow calculation method based on forward-backward sweep. The power distribution network load flow calculation method based on forward-backward sweep comprises the four steps of simplifying a power distribution network into an undirected graph, obtaining an impedance matrix and the undirected graph of the power distribution network to carry out deep search, obtaining a node access sequence of the power distribution network, and using the forward-backward sweep load flow of the power distribution network to work out the voltage of each node, the power of each branch and the loss power of the power distribution network. The power distribution network load flow calculation method based on forward-backward sweep does not need to form a node admittance matrix, does not need to solve a high-order equation set, is simple in calculation formula, is rapid in convergence, is quite practicable and has good application prospects.
Description
technical field [0001] The invention relates to a distribution network power flow calculation method based on forward-backward generation, and belongs to the technical field of distribution network analysis, operation and control. Background technique [0002] At present, there are a large number of primary and secondary equipment in the distribution network, the loss of distribution transformers and lines is serious, and the loss of the power system is mainly in the distribution network. , Operation control is of great significance. On the one hand, the distribution network has a huge number of tie switches and section switches, and distribution network automation demonstration projects have been fully rolled out in cities across the country. Network reconstruction is an important part of distribution automation. The switch state can reduce the network loss. Since the load changes in real time, it is required that the main station system can adapt to the load change and ad...
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IPC IPC(8): H02J3/00
Inventor 张剑袁晓冬
Owner STATE GRID CORP OF CHINA