A Linear Method for Calculating Power Flow of Three-phase Distribution Network Based on Loop Analysis Method

A loop analysis method and power grid technology, which is applied to AC networks, circuit devices, and AC network circuits with the same frequency from different sources, can solve problems such as low algorithm accuracy, large resource occupation, and large storage space, and achieve calculation accuracy High, less resource occupation, high computing efficiency

Active Publication Date: 2018-05-08
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] Most power system optimization problems are essentially optimal power flow problems for different objectives. These algorithms are nonlinear algorithms. Power flow calculations need to be solved iteratively, and in some abnormal situations such as heavy burdens, the convergence may be slow or even slow. Convergence, the conventional nonlinear power flow calculation can provide an accurate result, but the calculation time is long and the storage space is large
[0004] The direct current power flow algorithm (DCPF) is a linearized approximation method of the traditional Newton-Raphson algorithm, which can directly calculate the power flow without iterative calculations and is absolutely convergent. However, because the DCPF calculation ignores the line loss, reactive power and voltage changes, that is, it is assumed that the voltage remains constant, but this condition is difficult to guarantee, so the accuracy of the algorithm is low, and in some abnormal situations , the error is large, and even cannot meet the engineering requirements
[0005] To sum up, the existing nonlinear power flow algorithm takes a long time to calculate, has low calculation efficiency, and consumes a lot of resources, while the DC power flow algorithm has high calculation efficiency, but its accuracy is poor

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  • A Linear Method for Calculating Power Flow of Three-phase Distribution Network Based on Loop Analysis Method
  • A Linear Method for Calculating Power Flow of Three-phase Distribution Network Based on Loop Analysis Method
  • A Linear Method for Calculating Power Flow of Three-phase Distribution Network Based on Loop Analysis Method

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Embodiment 1

[0141] In order to better illustrate the solution of the present invention, the present invention selects three three-phase balanced system calculation examples, a 33-node power distribution system, a 69-node power distribution system and a 210-node medium and low voltage power distribution system. For details, please refer to Wang Shouxiang, Wang Cheng Shan, Analysis of Modern Power Distribution System [M], Beijing: Higher Education Press, 2007:196-202 and 'Li Hongwei, Jin Yong, Zhang Anan, Shen Xia, Jin Xu. An improved hybrid loadflow calculation algorithm for weakly-meshed power distribution system.Int J Electr Power Energy Syst2016; 74:437–45', the corresponding content will not be repeated here, and the calculation results of the aforementioned nonlinear iterative power flow algorithm based on the loop analysis method are selected as a benchmark to define the voltage amplitude error is ΔU k =|U k_loop -U k_linear |(per unit value, p.u.) and angle error Δθ k =|θ k_loop...

Embodiment 2

[0151] In order to verify the effectiveness and feasibility of the proposed algorithm, the present invention also selects three three-phase unbalanced system examples for testing and analysis, namely IEEE 13, IEEE37 and IEEE 123 system examples, for details, please refer to the 'DistributionSystem Analysis Subcommittee .Radialdistribution test feeders[EB / OL]', http: / / ewh.ieee.org / soc / pes / dsacom / testfeeders / index.html', no more details here, among them, IEEE 13 and IEEE 123 systems include Single-phase lines (loads), two-phase lines (loads) and three-phase lines (loads) are mixed distribution network systems. The calculation results of the loop analysis method algorithm are also selected as the benchmark, and the corresponding calculation results are shown in Table 4 (the error comparison table of the power flow calculation results of the unbalanced distribution system example).

[0152]

[0153] Table 4

[0154] It can be seen from Table 4 that for the three calculation ex...

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Abstract

The invention discloses a loop-analysis method based linear method for calculating a three-phase power distribution network tide. The loop-analysis method based linear method comprises the following steps: obtaining the relation function of node voltages and node injection currents of a power distribution network according to a loop-analysis method; for a single-phase system, according to the relation function, obtaining node injection currents in an impedance anti-load, a constant current load, a constant power load and a mixed mode respectively, and introducing in the relation function for calculation to obtain node voltage values; and for a three-phase system, according to the relation function, obtaining node injection currents in an impedance anti-load, a constant current load and a constant power load, and introducing in the relation function for calculation to obtain node voltage values, wherein the three-phase system comprises a star connection load and a delta connection load. The method disclosed by the invention is high in calculation efficiency, few in occupied resources and high in calculation accuracy.

Description

technical field [0001] The invention relates to the field of power grid distribution, in particular to a linear method for calculating the power flow of a three-phase distribution network based on a loop analysis method. Background technique [0002] With the rapid development of the national economy and the improvement of people's living standards, people's demand for electricity is increasing, and at the same time, higher requirements are put forward for the reliability and quality of power supply. Reasonable distribution network optimization is an important basis for power system security, stability and economic operation. [0003] Most power system optimization problems are essentially optimal power flow problems for different objectives. These algorithms are nonlinear algorithms. Power flow calculations need to be solved iteratively, and in some abnormal situations such as heavy burdens, the convergence may be slow or even slow. Convergence, the conventional nonlinear ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 李红伟刘宇陆蒋嘉焱戴宁张安安林山峰
Owner SOUTHWEST PETROLEUM UNIV
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